TWI834921B - Drainage pipe structure - Google Patents

Abstract

A drainage pipe structure includes: a first drainage system that drains drainage from a first water-surrounding device; a second drainage system that drains drainage from a dishwasher (second water-surrounding device); a siphon drainage pipe to which the first drainage system is connected at an upstream side and to which the second drainage system is connected further toward a downstream side than the first drainage system; and a pressure reducing pipe that is provided at the second drainage system, and that reduces drainage pressure in the second drainage system.

Description

Drain pipe structure

The present invention relates to a drainage pipe structure.

Japanese Patent Application Laid-Open No. 2016-196744 (Patent Document 1) discloses a siphon drainage structure in which two water-using machines (a kitchen sink and a dishwasher) are connected to one siphon drainage pipe. Specifically, the first drainage inlet pipe system that allows drainage from the kitchen sink to flow is connected to the siphon drain pipe through a drain trap and a check valve, and the second drainage pipe that allows drainage from the dishwasher to flow The introduction pipe is connected to the first drainage introduction pipe or the transverse pipe (siphon drainage pipe) on the downstream side of the above-mentioned drainage trap. The check valve prevents the drain water from the dishwasher from flowing back to the kitchen sink side.

Furthermore, Japanese Patent Application Laid-Open No. 2018-105035 (Patent Document 2) discloses a technology that uses a pressure relaxation device instead of a check valve to relax the pressure rise on the downstream side of the drainage trap in the same drainage structure.

In addition, there are models of dishwashers with lower drainage pressure and models with larger drainage pressure. It is believed that when the drainage pressure is high, the air in the pipe will be forced out to the side of the kitchen sink, causing the water seal in the drain trap to be destroyed due to the increase in pressure in the drain pipe. Although the above-mentioned unsealing can be suppressed by using the check valve described in the above-mentioned Patent Document 1, there is a problem that the service life is affected by repeated opening and closing of the check valve. It is also considered to use the pressure relaxation device described in Patent Document 2 instead of a check valve to reduce the pressure rise in the drain pipe. However, the drain water from the dishwasher will flow backward to the side of the kitchen sink and reach the air inlet towards the pressure relief device. If the inlet is blocked by the reverse flow of drain water, it will be difficult to use the pressure relief device to relieve the drain pipe. The pressure inside rises.

The object of the present invention is to provide a drainage pipe structure in which a plurality of water machines are connected to one siphon drainage pipe. When water is drained from a water machine connected to the downstream side, backflow to the water machine side of the upstream side and pressure rise on the water machine side can be suppressed.

The drainage pipe structure related to the first aspect includes: a first drainage system that allows drainage from the first water machine to flow; a second drainage system that allows drainage from the second water machine to flow; and a siphon drainage pipe that The first drainage system is connected to the upstream side, and the second drainage system is connected to the downstream side of the first drainage system; the pressure reducing pipe is installed in the second drainage system and will reduce the pressure of the second drainage system. Drainage pressure in the system.

In this drainage pipe structure, the drainage from the first water machine flows into the siphon drainage pipe through the first drainage system. In addition, the drain water from the second water equipment flows into the siphon drain pipe through the second drainage system. In either case, the inside of the siphon drain pipe becomes full and a siphon force is generated to attract the drained water to the downstream side. Since the second drainage system is equipped with a pressure reducing pipe, even if the drainage pressure of the second water machine is large and the flow rate of the drainage is large, the pressure reducing pipe can still be used to reduce the drainage pressure and reduce the drainage speed. Therefore, when water is drained from the second water machine, it is possible to suppress the drainage from flowing backward toward the first water machine connected to the upstream side of the second water machine.

The second aspect is a drainage pipe structure related to the first aspect, and the pressure reducing piping system has a bent pipe.

In this drainage pipe structure, when drainage passes through the bent pipe, pressure loss can occur in the drainage. Therefore, the drainage pressure can be reduced.

The third aspect is a drainage pipe structure related to the first aspect, and the pressure reduction piping system has a pipe whose inner diameter changes to a small diameter.

In this drainage pipe structure, when drainage passes through a pipe whose inner diameter changes to a small diameter, pressure loss can occur in the drainage. Therefore, the drainage pressure can be reduced.

The fourth aspect is in the drainage pipe structure related to the first aspect, and the pressure reducing piping system has branch pipes that branch from upstream to downstream and have closed ends.

In this drainage pipe structure, part of the drainage can enter the branch pipe to hinder the flow of drainage, causing pressure loss in the drainage. Therefore, the drainage pressure can be reduced.

The fifth aspect has a temporary storage part in the drainage pipe structure related to any one of the first to fourth aspects. The temporary storage part is provided in the second drainage system, and the inlet is provided higher than the outlet. At the position, the volume per unit length in the second drainage system will be partially expanded, And the up and down direction is the cylindrical direction; the inlet is formed into a cylindrical shape with the transverse direction as the axial direction; the axis of the inlet is eccentric with respect to the axis of the temporary storage part; the outlet is It is formed into a cylindrical shape with the transverse direction as the axis direction; the axis of the outlet is not eccentric with respect to the axis of the temporary storage part.

In this drainage pipe structure, since the inlet of the temporary storage part is formed in a cylindrical shape with the transverse direction as the axis direction, and the axis center of the inlet is eccentric with respect to the axis center of the temporary storage part, temporary storage may easily occur. The air and drainage in the part are replaced to allow the drainage to flow smoothly into the temporary storage part. Thereby, the discharge of air from the temporary storage part is suppressed. In addition, by this, the inflow of air to the first water machine side can be reduced, thereby suppressing an increase in pressure on the first water machine side.

In addition, the outlet of the temporary storage part is formed in a cylindrical shape with the transverse direction as the axis direction. Since the axis center of the outlet is not eccentric with respect to the axis center of the temporary storage part, the drainage flowing into the temporary storage part becomes Easy to gather at the exit. Therefore, the drainage water from the outlet will flow out smoothly.

The sixth aspect is a drainage pipe structure related to any one of the first to fifth aspects, and there is a pipeline between the pressure reduction pipe and the siphon drainage pipe in the second drainage system that will descend first. The upright part rises again.

In this drain pipe structure, since the upright portions of the pressure reduction pipe and the siphon drain pipe in the second drainage system are filled with drainage water, less air can be maintained in the pipeline from the upright portion to the siphon drain pipe. Thereby, when water is drained from the second water machine next time, the inflow of air to the first water machine side can be reduced, thereby suppressing an increase in pressure on the first water machine side.

The seventh aspect is a drainage pipe structure related to any one of the first to sixth aspects, in which a first drainage well is provided in the first drainage system; the first drainage well has an inflow part for The inflowing drainage water flows downward; the first descending curved pipe part is provided below the inflow part and curves downward from the vertical upper side toward the horizontal direction; the first ascending curved pipe part is provided above the first descending The bent pipe part is on the drainage downstream side and is bent upward from the horizontal direction to the upper side in the vertical direction; the second rising curved pipe part is provided on the downstream side of the first rising curved pipe part in the drainage direction and is bent upward from the vertical direction downward side. Curved upward in the horizontal direction; a second descending curved pipe portion is provided on the downstream side in the drainage direction of the second ascending curved pipe portion and curved downward from the horizontal direction toward the lower side in the vertical direction; and a pressure relaxing device, It is arranged above the second descending curved pipe part and communicates with the second descending curved pipe part to relieve the pressure in the pipe.

In this drainage pipe structure, when the drainage flows into the inflow part, the drainage passes through the first descending curved pipe part, the first ascending curved pipe part, the second ascending curved pipe part, and the second descending curved pipe part and is discharged toward the downstream side. discharge. Drainage will remain in the curved portion formed by the first descending curved pipe part and the first ascending curved pipe part, and the accumulated drainage water will become sealing water.

For example, when the downstream side of the pipe trap is instantly higher than the atmospheric pressure, in other words, the pressure becomes positive instantly, the air on the downstream side of the pipe trap will press the sealing water from the downstream side, causing the sealing water to flow backward toward the inlet side. . However, the pressure of the air that presses the sealing water and causes it to flow backward toward the inlet side will be relaxed by the pressure relaxation device provided on the downstream side of the drainage direction of the sealing water, so the pressure acting on the sealing water will be less pressure. Mitigation device conditions become smaller to inhibit unblocking.

Here, in the second descending curved pipe portion of the pipe trap, the drain water flows as if it is falling from the upper side to the lower side. Since the pressure relaxing device is disposed above the second descending curved pipe portion, when the wastewater flows to the second descending curved pipe portion, it is difficult for the wastewater to flow into the pressure relaxing device. Therefore, it becomes difficult for foreign matter such as dirt in the drainage water to enter the pressure relaxing device.

The eighth aspect is a drainage pipe structure related to the seventh aspect, in which a ventilation portion that can introduce air from the outside to the downstream side of the water sealing portion of the first drainage well is provided above the pressure relaxing device. .

In this drainage pipe structure, since the ventilation part is provided downstream of the water sealing part of the first drainage trap, when the siphon force is generated and a negative pressure is generated on the downstream side of the first drainage trap, the ventilation part can be to introduce outside air. Thereby, unsealing of the first drainage well can be suppressed.

The ninth aspect is a drainage pipe structure related to the seventh aspect or the eighth aspect, in which the connection line at the upstream end of the axis of the first rising curved pipe portion in the drainage direction is aligned with the axis of the inflow portion. Has an angle.

In this drainage pipe structure, the connection line at the upstream end of the axis of the first ascending curved pipe portion in the drainage direction has an angle with respect to the axis of the inflow portion. Therefore, the flow direction of the drainage flowing from the inflow portion to the first rising curved pipe portion is such that the line at the upstream end of the drainage direction of the axis of the first rising curved pipe portion does not have an angle with respect to the axis of the inflow portion. The pipeline changes rapidly, causing the flow path resistance to increase. This flow path resistance not only acts on the normal flow of drainage, but also acts on the reverse flow of drainage.

According to the present invention, in a drainage pipe structure in which a plurality of water equipment is connected to one siphon drainage pipe, when water is drained from the water equipment connected to the downstream side, the backflow to the water equipment side of the upstream side and the water equipment can be suppressed. side pressure rises.

1: 1st drainage system

2: 2nd drainage system

10: Drainage pipe structure

12:Floor

14:Floor

16:Kitchen sink

16A: Drainage outlet

18: Dishwasher

20: Processor

22:Piping

24: Water-sealed pipe trap

26:Piping

28:Business joint

30:Siphon drain pipe

30A: Horizontal tube

30B: Standpipe

32: Longitudinal hole

34: Drainage riser

65: Pressure adjustment device

66: Pressure relieving device

90: Check valve

110: Ventilation valve

202: Primary drainage trap

203:Secondary drainage trap

204: Temporary storage department

206: Pressure reduction piping

208:Pars erectus

210, 212: Piping

FIG. 1 is a cross-sectional view showing a part of a building to which a drainage pipe structure according to an embodiment of the present invention is applied.

Figure 2 is a side view of a pipe trap used in the drainage pipe structure of the present invention.

Figure 3A is a cross-sectional view along the axis of the tube trap shown in Figure 2;

Figure 3B is a cross-sectional view along the axis of the tube trap.

Figure 4 is a cross-sectional view showing the pressure relief device, check valve and ventilation device.

FIG. 5 is a cross-sectional perspective view showing a part of the pressure relaxing device.

Figure 6 is a cross-sectional view showing the elastic expansion and contraction body of the pressure relaxing device.

FIG. 7 is a cross-sectional view showing a part of the check valve according to the modification.

FIG. 8 is a cross-sectional view showing a pressure relaxing component according to a modified example.

Fig. 9 is a cross-sectional view showing the temporary storage part, the pressure reduction pipe and the upright part.

Figure 10 is a perspective view showing the temporary storage unit.

Figure 11 is a front view of the temporary storage unit.

Fig. 12 is a perspective view showing modification 1 of the pressure reduction pipe.

Fig. 13 is a longitudinal sectional view showing Modification 1 of the pressure reduction piping.

Fig. 14 is a cross-sectional view showing modification 1 of the pressure reduction pipe.

Fig. 15 is a longitudinal sectional view showing modification 2 of the pressure reduction piping.

Fig. 16 is a longitudinal sectional view showing Modification 3 of the pressure reduction piping.

Fig. 17 is a cross-sectional view schematically showing the function of the second drainage system in the drainage pipe structure.

Figure 18 is a cross-sectional view schematically showing the functions of the temporary storage part and the upright part.

Figure 19 is a cross-sectional view showing the rectifier assembly related to the second modification.

FIG. 20 is a side view of the rectifier assembly related to the second modification.

FIG. 21 is a bottom view of the rectifier assembly related to the second modification.

Fig. 22 is a perspective view showing the pressure relaxing device according to the second modification.

FIG. 23 is a cross-sectional view along the axis of the pressure relaxing device according to the second modification.

Figure 24 is a perspective view of the pressure relief device with the cover removed.

Figure 25(A) is a perspective view of the elastic expansion and contraction body, and Figure 25(B) is a cross-sectional view along the axis of the elastic expansion and contraction body (cross-sectional view along line 25(B)-25(B) of Figure 25(B) ).

Figure 26(A) is a top view of the elastic expansion and contraction body viewed from the axial direction, and Figure 26(B) is a cross-sectional view perpendicular to the axis of the elastic expansion and contraction body (Figure 26(B)-26 (B) line cross-sectional view), Figure 26(C) is a cross-sectional view perpendicular to the axis of the elastic expansion and contraction body in which the interior is in a negative pressure state.

Figure 27 is a perspective view showing a cross-section of the elastic expansion body with the lower support component and the upper support component installed.

Figure 28 is a perspective view showing the first half-section component and the second half-section component.

FIG. 29(A) is a perspective view of a valve body in a normal state, and FIG. 29(B) is a perspective view of a valve body that floats up to close the opening of the valve seat due to reverse flow of drainage water.

Hereinafter, modes for implementing the present invention will be described based on the drawings. In each drawing, components shown using the same symbols mean the same or similar components. In addition, in the embodiments described below, overlapping descriptions and symbols may be omitted.

In FIG. 1 , a drainage pipe structure 10 related to this embodiment has a first drainage system 1 , a second drainage system 2 , a siphon drainage pipe 30 , a pipe well 24 as a first drainage well, and a primary drainage well as a second drainage well. Drainage well 202, temporary storage part 204, pressure reduction pipe 206 and upright part 208.

The first drainage system 1 is a piping structure that allows drainage from the kitchen sink 16 which is an example of the first water appliance to flow. Moreover, the 2nd drainage system 2 is a piping structure which allows the drainage from the dishwasher 18 which is an example of a 2nd water appliance to circulate.

As shown in FIG. 1 , a floor 14 is arranged at intervals above the floor 12 of the residence. A kitchen sink 16 as a first water machine and a dishwasher as a second water machine are arranged above the floor 14 . Machine 18.

The processor 20 is installed in the drain outlet 16A of the kitchen sink 16 . A pipe 22 , a water-sealed pipe trap 24 and a pipe 26 are connected to the downstream side in the drainage direction of the processor 20 .

A manifold joint 28 and a siphon drainage pipe 30 are arranged on the downstream side of the pipe 26 in the drainage direction. siphon The drainage pipe 30 is configured to include a horizontal pipe 30A and a vertical pipe 30B having the same inner diameter as the pipe 26 .

The downstream end of the pipe 26 in the drainage direction is connected to the transverse pipe 30A of the siphon drainage pipe 30 through the manifold joint 28 . In addition, a pipe 210 for draining waste water from the dishwasher 18 described below is connected to the manifold joint 28 .

The horizontal pipe 30A is arranged above the floor slab 12, and the vertical pipe 30B of the siphon drainage pipe 30 hangs down through the vertical hole 32 formed in the floor slab 12, and is connected to a drainage riser pipe 34 extending in the vertical direction of the house.

(tube trap)

As shown in FIG. 2 , the tube well 24 of this embodiment has a roughly S-shape when viewed from the side, and is a so-called water-sealed well. In addition, the pipe trap 24 of this embodiment is connected to a pressure adjusting device 65 described later.

As shown in FIG. 3A , the pipe trap 24 of this embodiment is provided with an inflow-side pipe connection part 36 that connects the lower end part of the pipe 22 , and a first curved pipe part 38 having a substantially U shape. The pipe trap 24 is formed on the first curved pipe. The vertical pipe part 40 on the downstream side of the drainage direction of the part 38, the second curved pipe part 42 formed on the downstream side of the vertical pipe part 40 in the drainage direction and having a slightly reverse U shape, and the second curved pipe part 42 is formed on the drainage direction of the vertical pipe part 40. The reduced diameter pipe part 44 on the downstream side, and the discharge side pipe connection part 46 formed on the downstream side of the reduced diameter pipe part 44 in the drainage direction and connected to the upper end part of the pipe 26.

The inflow-side pipe connection part 36 is formed in a cylindrical shape with the axis as the vertical direction. The inflow-side pipe connection portion 36 has, for example, an inner diameter D1 that allows the lower end portion of the pipe 22 with a nominal diameter of 30A to be inserted.

A male thread 36A is formed on the outer periphery of the upper end side of the inflow-side pipe connection portion 36 , and a female thread 48A of the annular nut 48 that fixes the pipe 22 is screwed into the male thread 36A.

The inflow-side pipe connection portion 36 has a step portion 36B formed at an end portion on the downstream side in the drainage direction. The step portion 50 is in contact with the lower end portion of the pipe 22 inserted into the inflow-side pipe connection portion 36 .

The inner diameter of the first curved pipe portion 38 gradually decreases toward the downstream side in the drainage direction. The inner diameter D2 at the end of the drainage inflow side is the same as the inner diameter of the pipe 22 (for example, φ30 mm). The inner diameter D3 at the discharge side end is φ25 mm, for example.

In addition, a portion of the first curved pipe portion 38 that is bent from above to transversely and downward on the upstream side in the drainage direction is referred to as a first descending curved pipe portion 38A, and a portion that is bent from the transverse direction toward upwards on the downstream side in the drainage direction. The upwardly curved portion serves as the first ascending curved tube portion 38B.

Here, the line L1 at the upstream end of the axis 38CL of the first curved pipe part 38 in the drainage direction is relative to the axis 36CL of the inflow-side pipe connection part 36 (with the axis of the pipe 22 inserted into the inflow-side pipe connection part 36 22CL is coaxial) and has an angle θ 1 and crosses.

Therefore, compared with the case where there is no angle θ 1 and the intersection does not occur, the drainage flowing from the inlet-side pipe connection part 36 (pipe 22) to the first curved pipe part 38 is resisted.

In other words, when the gas tries to flow from the first curved tube portion 38 to the inflow-side pipe connection portion 36 (pipe 22), the gas also encounters resistance. Although the explanation here is that "drainage will receive resistance", this is compared with the case where there is no angle θ 1 and there is no intersection. In fact, when the drain is drained from the kitchen sink 16 won't be a problem.

When the radius of curvature of the axis 38ACL of the first descending curved tube portion 38A is R1, and the radius of curvature of the axis of the first ascending curved tube portion 38B is R2, then R1>R2. The curvature radius R1 and the curvature radius R2 are each a single curvature radius.

In addition, the upstream end in the drainage direction (the portion indicated by the inner diameter D2) of the first curved pipe portion 38 is located lower than the downstream end in the drainage direction (the portion indicated by the inner diameter D3).

The lower end of the first curved tube portion 38 is provided with a cylindrical cleaning port 52 . A male thread 52A is formed on the outer periphery of the cleaning port 52 , and the cover 54 is installed on the cleaning port 52 by screwing and locking the female thread 54A of the cover 54 to the male thread 52A to close the cleaning port 52 . In addition, in this embodiment, although the cleaning port 52 is provided at the lower end of the first curved tube portion 38, the cleaning port 52 may be provided as needed, or may not be provided.

The vertical pipe portion 40 disposed on the downstream side in the drainage direction of the first ascending curved pipe portion 38B has a cylindrical shape and has the axis 40CL as the vertical direction. The inner diameter D4 of the vertical pipe portion 40 is the same inner diameter (φ25 mm) as the inner diameter D3 of the drain discharge side end of the first curved pipe portion 38 .

Furthermore, the axis 40CL of the vertical pipe portion 40 is coaxially aligned with the line L2 at the downstream end in the drainage direction of the axis 38CL of the first ascending curved pipe portion 38B.

The inner diameter of the second curved pipe portion 42 disposed on the downstream side of the vertical pipe portion 40 in the drainage direction gradually decreases toward the downstream side in the drainage direction.

Among the second curved pipe portions 42, a portion that is curved from below to transversely and upward on the upstream side in the drainage direction is referred to as the second ascending curved pipe portion 42A, and a portion that is curved from a transverse direction to downwards on the downstream side in the drainage direction is a second ascending curved pipe portion 42A. The portion serves as the second descending curved tube portion 42B.

The inner diameter D5 of the drain inflow side end of the second curved pipe part 42 (the connection part with the vertical pipe part 40) is the same as the inner diameter D4 of the vertical pipe part 40. The drain discharge of the second curved pipe part 42 is The inner diameter D6 of the side end portion (the connection portion with the reduced diameter pipe portion 44) is, for example, φ 20 mm.

The radius of curvature of the axis 42CL of the second curved tube portion 42 is R3. The line L3 at the upstream end in the drainage direction of the axis 42CL of the second curved pipe part 42 and the axis 40CL of the vertical pipe part 40 are coaxially aligned (overlapping) without having an angle.

A cylindrical pressure relaxing device mounting portion 56 extending to the upper side in the vertical direction and opening upward is integrally formed at the middle portion of the second descending curved pipe portion 42B in the drainage direction. A male thread 56A is formed on the outer periphery of the pressure relaxing device mounting portion 56. The male thread 56A is threaded with a female annular nut 57 provided in the insertion pipe portion 82 of the pressure relaxing device 66 of the pressure adjusting device 65 described later. Thread 57A.

The rectifying assembly 58 is inserted into the pressure relaxing device mounting portion 56 . The rectification assembly 58 includes a cylindrical portion 58A inserted into the pressure relaxing device mounting portion 56, and a fin portion 58B is integrally formed at the lower end of the cylindrical portion 58A. The fin portion 58B protrudes from the inside of the second descending curved tube portion 42B and is inclined relative to the vertical direction so as to guide the drainage direction flowing from the upstream side toward the reduced-diameter tube portion 44 side. In other words, the fin portion 58B makes it difficult for the drainage water flowing from the upstream side to flow toward the pressure relaxing device 66 side to be described later.

The reduced-diameter pipe portion 44 provided on the drainage direction downstream side of the second descending curved pipe portion 42B has a cylindrical shape whose inner diameter gradually decreases toward the drainage direction downstream side, and has the axis 44CL as the vertical direction. The inner diameter D6 of the end portion on the drainage inflow side of the reduced diameter pipe portion 44 (the connection portion with the second descending curved pipe portion 42B) is the same as the inner diameter D6 of the end portion on the downstream side in the drainage direction of the second descending curved pipe portion 42B. diameter. On the other hand, the inner diameter D7 of the end portion on the drainage side of the reduced-diameter pipe portion 44 is φ16 mm, for example.

In addition, the line L4 at the downstream end in the drainage direction of the axis 42CL of the second bent pipe part 42 and the axis 44CL of the reduced diameter pipe part 44 are coaxially aligned (overlapping) without having an angle.

The downstream side in the drainage direction of the reduced diameter pipe portion 44 is provided coaxially with the cylindrical reduced diameter pipe portion 44 . In addition, the discharge-side piping connection portion 46 is formed with a step portion 47 whose diameter decreases toward the reduced-diameter pipe portion 44 at an end portion on the upstream side in the drainage direction. This step portion 47 is in contact with the upper end portion of the pipe 26 inserted into the discharge-side pipe connection portion 46 .

A male thread 46A is formed on the outer periphery of the lower end side of the discharge-side pipe connection portion 46 , and a female thread 64A to which an annular nut 64 for fixing the pipe 26 is screwed is screwed into the male thread 46A. In addition, the discharge-side pipe connection part 46 of this embodiment has, for example, an inner diameter D8 that allows the pipe 26 with a nominal diameter of 20A to be inserted.

This pipe trap 24 stores a part of the drainage discharged from the kitchen sink 16 as sealing water in the inflow-side pipe connection part 36, the first curved pipe part 38, the vertical pipe part 40, and the second curved pipe part 42. In addition, the two-point chain line shown by the symbol Ws in FIG. 3A represents the normal sealing water surface.

In addition, the height of the liquid level Ws of the normally sealed water stored in the tube well 24 is consistent with the height position of the uppermost end portion Pt of the internal flow channel wall surface inside the bending radius of the second curved tube portion 42 . Assume that if the liquid level Ws of the drained water rises higher than the uppermost end Pt, the drained water will exceed the uppermost end Pt and flow toward the downstream side of the drainage direction. In the end, the liquid level Ws will still be consistent with the height position of the uppermost end Pt. .

In addition, as shown in FIG. 3B , in the pipe trap 24 of this embodiment, the water sealing depth h refers to the lowermost end Pu from the upper inner circumferential surface 38UF of the first curved pipe portion 38 in a roughly U-shape. The dimension measured in the vertical direction to the uppermost end portion Pt of the internal flow path wall surface inside the bend radius of the second curved pipe portion 42 . In addition, the water sealing depth h is a size (for example, 50 mm or more) determined by specifications (for example, drainage equipment technical standards) in order to suppress the pipe trap 24 from being unsealed.

In the pipe well 24, the end portion on the drainage inflow side (that is, the height position of the upper end 36T of the upstream side in the drainage direction of the inflow-side pipe connection portion 36) is preferably located at the highest point in the pipeline inside the first curved pipe portion 38. Between the lower end Pb and the uppermost end Pt of the second curved tube portion 42 . In this embodiment, the height position of the upper end portion 36T of the inflow-side pipe connection portion 36 is at the same height as the height position of the uppermost end portion Pt of the second curved pipe portion 42 .

(Pressure adjustment device)

The pressure adjusting device 65 of this embodiment is configured to include a pressure relaxing device 66, a check valve 90, and a vent valve 110. As shown in FIGS. 4 and 5 , the pressure relaxing device 66 installed on the pressure relaxing device mounting portion 56 is configured to include a thin-walled elastic expansion and contraction body 68 made of an elastic material such as rubber, and to support the elastic expansion and contraction body. The lower support component 70 on the lower end side of 68 supports the upper support component 72 on the upper end side of the elastic expansion and contraction body 68 , and the cover body 74 .

The elastic expansion and contraction body 68 has a cylindrical expansion and contraction portion 68A that is formed into a substantially cross-shaped cross-sectional shape in a free state as shown in FIG. 6 . Both axial ends of the expansion and contraction portion 68A are integrally formed with radially facing The outer peripheral portion of the annular base portion 68B extending outward is integrally formed with an annular mounting portion 68C for mounting the elastic expansion and contraction body 68 to the lower support component 70 and the upper support component 72 . In addition, a thick-walled rib 68D is formed at the end of the mounting portion 68C.

As shown in FIGS. 4 and 5 , the mounting portion 68C on the lower side of the elastic expansion and contraction body 68 is clamped and fixed between the lower support component 70 and the cover 74 , and the rib 68D is inserted into the outer periphery of the lower support component 70 The annular groove 78 formed.

In addition, the mounting portion 68C on the upper side of the elastic expansion and contraction body 68 is clamped and fixed between the upper support component 72 and the cover 74 , and the rib 68D is inserted into the annular groove 78 formed on the outer periphery of the upper support component 72 .

A tapered through hole 80 is formed in the center of the lower support component 70 , and an insertion tube portion 82 that communicates with the through hole 80 protrudes downward at the center of the lower support component 70 . As shown in FIG. 3A , the insertion pipe portion 82 is inserted into the pressure relaxing device mounting portion 56 of the pipe trap 24 , and the pressure relaxing device 66 is installed on the pipe trap 24 .

As shown in FIG. 4 , a tapered through hole 84 is formed in the center of the upper support component 72 , and a cylindrical check valve mounting portion 86 that communicates with the through hole 84 protrudes upward at the center of the upper support assembly 72 . A male thread 86A is formed on the outer periphery of the check valve mounting portion 86 .

(check valve)

As shown in FIG. 4 , a check valve 90 is attached to the check valve mounting portion 86 of the pressure relaxing device 66 .

The check valve 90 is configured to include a cylindrical body 92, a spherical valve body 94, a cover 96, and the like. A female thread 92A is formed on the inner circumference of the lower part of the body 92, and the check valve is connected by threading and locking the male thread 86A of the check valve mounting part 86 of the pressure relaxing device mounting part 56 to the female thread 92A. 90 is installed in the pressure relief device 66.

A partition wall 98 is formed inside the main body 92 to divide the interior into upper and lower parts. A dome-shaped valve body support portion 100 that is convex upward is integrally formed in the center of the partition wall 98 . The valve body support part 100 prevents the valve body 94 from moving downward, so that the valve body 94 does not fall to the pressure relaxing device 66 below.

The partition wall 98 has a plurality of through holes 102 formed on the radial outer side of the valve body support portion 100 . The through hole 102 can connect the space on the upper side and the space on the lower side of the partition wall 98 to allow drainage and air to pass.

The specific gravity of the spherical valve body 94 is set so that when drain water flows into the space above the partition wall 98 through the through hole 102, it floats on the drain water.

The cover 96 is formed with a female thread 96A that can be threaded with the male thread 92B formed on the upper periphery of the body 92. The cover 96 is installed on the body by threading and locking the female thread 96A with the male thread 92B. 92.

The cover 96 is provided with a valve seat 104, and a valve hole 106 is formed in the center of the valve seat 104. The valve hole 106 is blocked by the valve body 94 floating on the drain. Therefore, even if the drained water penetrates into the pressure relaxing device 66 , the drained water can be suppressed from flowing above the check valve 90 . In addition, the check valve 90 may be provided as needed, or may not be provided.

A vent valve 110 is installed on the upper part of the check valve 90 . The vent valve 110 of this embodiment is installed in a drain well or a drain pipe. Since it has a general structure, a description of the structure is omitted. In addition, the vent valve 110 sucks in outside air when the pressure on the downstream side in the drainage direction becomes negative, thereby suppressing the unsealing of the pipe trap 24 (the retained sealing water is attracted to the downstream side in the drainage direction due to the negative pressure and disappears).

When draining water, the vent valve 110 will suck in the atmosphere to protect the sealed water in the pipe well 24, and in normal times, it will close the valve to prevent the leakage of bad odor. As the ventilation valve 110, a known valve can be used (for example, the valve described in Japanese Patent Application Laid-Open No. 2009-299866).

In addition, "negative pressure" means that the pressure is lower than the outside air in the environment where the drainage pipe structure 10 is installed.

(First modification of pressure relaxing device)

FIG. 7 shows a pressure relief device 120 having a different structure than the pressure relief device 66 shown in FIG. 4 . The pressure relaxing device 120 shown in FIG. 7 is basically the same structure as the pressure relaxing device 66 shown in FIG. 4 , and only some shapes and parts are different. In addition, even if the shapes are different but the structures are basically the same, the same symbols are assigned and descriptions thereof are omitted.

The elastic expansion and contraction body 68 of the pressure relaxing device 120 of this embodiment has a cylindrical shape in the free state shown by the two-point chain line. When the internal pressure rises, it can expand in the radial direction as shown by the solid line. The outer side elastically deforms and bulges to relieve pressure.

The mounting portion 68C of the elastic expansion and contraction body 68 is fixed by the ring 122 arranged on the outer peripheral side. In addition, the upper end side upper support member 72 that supports the elastic expansion and contraction body 68 and the lower end side lower support member 70 that supports the elastic expansion and contraction body 68 are connected by the cylindrical support member 124. In addition, the support component 124 is configured to be divided into two parts in the radial direction, and can be connected and opened and closed by a hinge (not shown in the figure).

(First modification of check valve)

In addition, in the check valve 90 shown in FIG. 4 and the check valve 90 shown in FIG. 7 , although the valve body 94 is spherical, the valve body 94 may also have a large diameter portion as shown in FIG. 8 , for example. 112A and the cylindrical valve body 112 that enters the small diameter portion 112B of the valve hole 106 may have any shape. By adopting the above-mentioned shape, the effect of being able to stop water on the upper surface of the large-diameter portion 112A can be achieved. Since water is not stopped at points like a sphere, the water-stopping function can be improved.

(Second drainage system)

In FIG. 1 , the second drainage system 2 is a piping structure that allows drainage from a dishwasher 18 as an example of a second water-using machine to flow. The drainage portion of the dishwasher 18 has a built-in pressure pump (not shown in the figure), and the drainage is pushed by the pressure pump to make it flow. The dishwasher 18 or the second drainage system 2 is provided with a primary drainage trap 202 as a second drainage trap. The second drainage system 2 is provided with a secondary drainage trap 203 as a third drainage trap, a temporary storage portion 204, a pressure reducing piping 206, and a vertical portion 208. In FIG. 1 , the primary drainage trap 202 is built into the dishwasher 18. In addition, the primary drainage trap 202 may be provided in another second drainage system 2 different from the dishwasher 18. In this case, the secondary drainage trap 203 can also serve as the primary drainage trap 202.

The second drainage system 2 is connected to the downstream side of the first drainage system 1 in the transverse pipe 30A of the siphon drainage pipe 30 . Specifically, a bus joint 28 is provided on the downstream side of the first drainage system 1 in the horizontal pipe 30A, and the pipe 210 on the downstream side of the upright portion 208 in the second drainage system is connected to the bus joint 28 .

The secondary drainage trap 203 is a U-shaped pipe trap that is disposed between the primary drainage trap 202 and the temporary storage part in the second drainage system 2 and is, for example, convexly bent downward. The pipe 212 on the downstream side of the secondary drain well 203 extends upward and then extends laterally and is connected to the inlet 204A of the temporary storage part 204 .

(Temporary storage department)

In FIG. 9 , the temporary storage part 204 is provided in the second drainage system 2 , and the inlet 204A is provided at a position higher than the outlet 204B. The volume per unit length in the second drainage system 2 is partially expanded. In other words, the temporary storage part 204 is a chamber that can temporarily store drained water. The temporary storage portion 204 is formed in a cylindrical shape (eg, cylindrical shape or square cylindrical shape) with the vertical direction as the axis direction. Specifically, the temporary storage unit 204 is configured to include a cylindrical main body 214, an upper body 216, and a lower body 218. The upper body 216 has large diameter portions 216A and 216B at its upper and lower ends respectively. Body part The inner diameter of 214 is set to be larger than the inner diameter of pipe 212 . For example, a cover assembly 220 is removably embedded in the large-diameter portion 216A at the upper end. In Figure 10, cover assembly 220 (Figure 9) is shown removed. By removing the cover assembly 220 in this manner, the opening 216D is formed in the large diameter portion 216A. This opening can be used as a cleaning port. In addition, the cover assembly 220 may not be provided, and the upper end of the upper body 216 (temporary storage part 204) may be closed.

For example, the upper end of the main body part 214 is embedded in the large diameter part 216B of the lower end. A small diameter portion 216C is provided between the large diameter portions 216A and 216B. The entrance 204A of the temporary storage part 204 is provided in the small diameter part 216C. As shown in FIG. 11 , the inlet 204A has the transverse direction as the axis direction, and the axis X1 of the inlet 204A is eccentric with respect to the axis Z of the temporary storage part 204 .

The upper end of the lower body 218 is provided with a large diameter portion 218A. For example, the lower end of the main body part 214 is embedded in this large diameter part 218A. The outlet 204B of the temporary storage part 204 is provided at the lower end of the lower body 218, with the transverse direction as the axis direction. As shown in FIG. 11 , the axis X2 of the outlet 204B is not eccentric with respect to the axis Z of the temporary storage part 204 .

As shown in FIG. 9 , in the temporary storage part 204 , the inner surface 218B on the opposite side to the outlet 204B in the axis direction of the outlet 204B is curved, so that when the water is discharged from the temporary storage part 204 , the water will be discharged. Toward the exit 204B side. In other words, the lateral distance between the inner surface 218B and the outlet 204B decreases as it goes downward. As long as they have the same structure, the inner surface 218B may also be an inclined surface, or a combination of an inclined surface and a curved surface, or the like.

(Pressure reduction piping)

In FIG. 9 , a pressure reduction pipe 206 is provided between the temporary storage part 204 and the upright part 208 in the second drainage system 2 . This pressure reduction pipe 206 is a pipe for reducing the drainage pressure in the second drainage system 2 . In the example shown in FIG. 9 , the pressure reduction pipe 206 has a bent pipe. This pipe system is formed in a corrugated shape having an amplitude in the radial direction of the temporary storage portion 204, and has, for example, two turn-back portions 206A and 206B. Thereby, the flow directions of the drainage water are reversed at the folded portions 206A and 206B respectively.

The structure of the pressure reduction pipe 206 is not limited to this, and may be the structure shown in FIGS. 12 to 16 . In the example of modification 1 shown in FIGS. 12 to 14 , the inlet 222 and the outlet 224 are respectively provided in the up and down directions, and a vortex portion 226 is provided between the inlet 222 and the outlet 224 . The inlet 222 is opened at the central end of the vortex portion 226 , and the outlet 224 is opened at the outer end of the vortex portion 226 . The flow direction of the drainage is at the point where it enters the vortex 226 from the inlet 222, and is bent slightly at right angles to the lateral direction (bent portion 226A in FIG. 13), for example, from the up and down direction. Thereafter, it is reversed at the folded portion 226B while maintaining the transverse direction, and bent at approximately right angles at the bending portions 226C and 226D. Then, at the location from the vortex portion 226 to the outlet 224, it is bent from the lateral direction to the up-down direction at a substantially right angle (bent portion 226E in FIG. 14).

In Modification 2 shown in FIG. 15 , the pressure reduction pipe 206 has a pipe whose inner diameter changes to a small diameter, and the inner diameter changes periodically. Specifically, the pressure reduction pipe 206 is formed in a cylindrical shape extending linearly, for example. Large-diameter portions 228 and small-diameter portions 230 are formed alternately in the axial direction on the inner surface of the pressure reduction pipe 206 . The boundary between the large diameter portion 228 and the small diameter portion 230 is, for example, a step orthogonal to the axial direction. For example, both ends of the pressure reduction pipe 206 serve as large-diameter portions 228 , one of which serves as the inlet 232 , and the other serves as the outlet 234 . In Modification 3 shown in FIG. 16 , the pressure reduction pipe 206 has a branch pipe 236 . The branch pipeline 236 is a pipeline branching from the upstream (inlet 238) to the downstream (outlet 240), and the end is closed. In this example, the pipeline is bent at a slight right angle toward the inlet 238 and the outlet 240, and a branch pipeline 236 is provided on an extension line from the inlet 238 at the bend. The length of the branch pipe 236 is, for example, equal to or less than the inner diameter of the pipe. Because the drainage water temporarily enters the branch pipe 236 and blocks the flow of the drainage water, a pressure loss occurs in the drainage water.

Furthermore, although illustration is omitted, the pressure reduction piping may be configured such that the inner diameter of the pipe gradually expands from the inlet to the outlet. In addition, although illustration is omitted, the pipe may be formed in a position where the inner diameter of a plurality of pipes is temporarily expanded and then contracted to return to the normal inner diameter. In other words, the inner wall of the pipeline can also be formed in a meandering shape relative to its axial direction. The range of the angle between the inner wall and the axial direction is, for example, 30° to 40°, suitably 33° to 36°.

In addition, the structure of the pressure reducing pipe 206 is not limited to the above-mentioned structure, as long as it can cause pressure loss in the drainage flowing through the pressure reducing pipe 206 . For example, protrusions can also be provided on the inner surface of the pipeline to create turbulent flow.

(upright part)

In FIG. 9 , the upright portion 208 is a portion that is provided between the temporary storage portion 204 and the siphon drainage pipe 30 ( FIGS. 1 , 17 , and 18 ) in the second drainage system 2 and is temporarily lowered and then raised. The upright portion 208 only needs to be a structure capable of storing sealing water like a U-shaped or S-shaped pipe trap. For example, the upright portion 208 has a descending portion 208A, a lowermost portion 208B, an ascending portion 8C, and an uppermost portion 208D.

The descending portion 208A is connected to the downstream side of the temporary storage portion 204 and is a portion where the pipeline advances downward. In this embodiment, the pressure reduction pipe 206 is connected to the downstream side of the temporary storage part 204, and the outlet 206C at the lower end of the pressure reduction pipe 206 is connected to the descending part 208A. On the downstream side of the temporary storage part 204, since the pipeline in the pressure reduction pipe 206 also advances downward, it may be considered that a part of the pressure reduction pipe 206 also serves as the descending part 208A. When the pressure reduction pipe 206 is omitted, the portion extending downward from the outlet 204B of the temporary storage portion 204 constitutes the descending portion 208A (Figs. 17 and 18).

The lowermost portion 208B is located at the lowest position in the upright portion 208 . The uppermost portion 208D is, for example, a horizontal portion, but as shown in FIGS. 17 and 18 , it may not be horizontal. The rising portion 208C is a portion extending linearly, for example, obliquely upward from the downstream end of the lowermost portion 208B. The shape of the rising portion 208C is not limited to a linear shape and may be curved. The uppermost portion 208D is a portion extending in, for example, a horizontal direction from the upper end of the rising portion 208C, and is located at the highest position of the upright portion 208 . The uppermost part 208D does not necessarily have to have a horizontal part, and the horizontal part may be omitted and the uppermost part 208D may be directly connected to the pipe 210 . The pipe 210 is a pipe 210 on the downstream side of the upright portion 208, extends downward, and is connected to the transverse pipe 30A (siphon drainage pipe 30) (Fig. 1, Fig. 17).

The uppermost part 208D of the upright part 208 may also be set at a position above the height of the outlet 204B of the temporary storage part 204. Line L in FIG. 9 represents the height position of the bottom of the outlet 204B of the temporary storage unit 204. In this example, the height position of the top 208E of the inner surface at the uppermost portion 208D is set to a position above the height of the line L. The position above the height of the line L refers to a height position equal to the line L, or a height position higher than the height of the line L.

In addition, if the height position of the uppermost part 208D is raised, the amount of drain water 242 stored in the temporary storage part 204 will increase, and if the height position of the uppermost part 208D is lowered, the amount of drain water 242 stored in the temporary storage part 204 will be increased. The amount will become less. In the example shown in FIG. 17 , the uppermost portion 208D of the upright portion 208 is set at a position lower than the height of the outlet 204B of the temporary storage portion 204 . If the height position of the uppermost part 208D is too low, the drain water 242 in the temporary storage part 204 will flow out. Therefore, the height position of the uppermost part 208D can be arbitrarily changed within the limit that the drain water 242 can be stored in the temporary storage part 204. .

(Effect)

Next, the functions and effects of the drainage pipe structure 10 of this embodiment will be described.

After the drain water is discharged from the kitchen sink 16 due to the use of the kitchen sink 16 , the drain water will pass through the processor 20 , the pipe 22 and the pipe trap 24 to reach the pipe 26 .

After that, the drainage will flow through the transverse pipe 30A and the vertical pipe 30B of the siphon drainage pipe 30. When part of the vertical pipe 30B is filled with drainage, when the drainage in the vertical pipe 30B falls due to gravity, the vertical pipe 30B A siphon force corresponding to the water head difference in the standpipe 30B will be generated inside.

The drainage in the horizontal pipe 30A will be attracted toward the vertical pipe 30B due to the siphon force, so that the horizontal pipe 30A and the vertical pipe 30B become a full flow filled with drainage, and the flow rate increases to flow down the horizontal pipe 30A and the vertical pipe 30B. . Thereby, the drain water from the kitchen sink 16 will be discharged toward the drain riser 34 .

On the other hand, when the drain water is discharged from the dishwasher 18, since the drain water will press the air inside the pipe 210 to the downstream side in the drainage direction, the air and pipes inside the transverse pipe 30A will be pressed, causing the cross pipe 30A to There is a positive pressure inside, and this positive pressure also acts toward the pipe trap 24 side through the pipe 26 .

In addition, "positive pressure" refers to the outside air whose pressure is higher than the environment in which the drainage pipe structure 10 is installed.

Here, when the drain water is instantly discharged from the dishwasher 18, a large positive pressure temporarily acts on the horizontal pipe 30A and the pipe 26, so the sealed water flows back toward the kitchen sink 16 side. This leads to the risk of the pipe trap 24 being unsealed. In addition, if a large amount of waste water is discharged from the dishwasher 18 instantly, the waste water discharged from the dishwasher 18 may flow backward toward the pipe trap 24 and overflow in the pipe trap 24 . This embodiment can prevent the water sealed in the pipe trap 24 from being released and the waste water discharged from the dishwasher 18 from overflowing in the pipe trap 24 as described below.

(1) When the drain water is instantly discharged from the dishwasher 18 and the positive pressure in the pipe 26 is instantly increased, the positive pressure in the pipe 26 will become positive. Although the air in the pipe 26 will be in the pipe trap 24 There is an internal reverse flow, but by relaxing the positive pressure through the pressure relaxation device 66 provided on the upstream side of the drainage direction of the sealed water, the unblocking of the sealed water (here the unblocking caused by the reverse flow of air) can be suppressed.

(2) Next, the pipe trap 24 of this embodiment is compared with a pipe trap of a conventional structure to explain that the drainage water flowing back from the dishwasher 18 is difficult to overflow in the pipe trap 24 of this embodiment.

In the conventional tube trap, as shown in FIG. 3B , the side view shape of the portion corresponding to the first curved tube portion 38 of this embodiment is a circular shape having a single radius of curvature. In addition, the upper inner peripheral surface of the pipeline corresponding to the upper inner peripheral surface 38UF of the pipeline in this embodiment is a virtual one shown by the two-point chain line FC1. Think of the partial arc shape of a circle. In addition, the diameter of the imaginary circle shown by the two-point chain line FC1 is the length of the straight line connecting P1 and P2.

Since the sealing water depth h is, for example, a size determined by specifications, the liquid level on the downstream side of the sealing water in a conventional pipe trap will be located above the arc-shaped pipeline shown by the two-point chain line FC. The lowermost end P'u of the inner peripheral surface is at a height h upward.

That is, the uppermost end P't of the conventional tube well, which is equivalent to the uppermost end Pt of the tube well 24 of this embodiment, is located lower than the uppermost end Pt of the tube well 24 of this embodiment by α. location.

Therefore, when the pipe trap 24 of this embodiment is installed at the same height as the conventional pipe trap, the water surface Ws can be positioned higher α than that of the conventional pipe trap. location.

Therefore, in the pipe trap 24 of this embodiment, the drainage water discharged from the dishwasher 18 on the downstream side and rising, that is, the counterflow drainage water, will be difficult to reach the sealing water stored in the pipe trap 24, and the water in the pipe trap will be suppressed. 24 seal water overflow.

(3) In addition, if the downstream side of the sealed water in the drainage direction of the pipe trap 24 becomes a negative pressure, the outside air will be introduced to the second descending bend of the pipe trap 24 through the vent valve 110 and the pressure relaxation device 66 The tube portion 42B is used to reduce the negative pressure acting on the sealed water, thereby suppressing unsealing caused by the negative pressure.

(4) In the tube well 24 of this embodiment, since the horizontal distance Lb is set to be smaller than the horizontal distance La, compared with the case where the horizontal distance La and the horizontal distance Lb are made the same , the drainage will flow easily.

(5) In addition, after the drain water is discharged from the kitchen sink 16, the drain water will flow through the processor 20, the pipe 22 and the pipe trap 24 in sequence. When drained water flows through the second curved pipe portion 42 of the pipe well 24, the drained water is guided toward the reduced diameter pipe portion 44 side by the fin portion 58B protruding from the inside of the second descending curved pipe portion 42B, so that it flows away from the kitchen. The drain water discharged from the stage 16 will be difficult to enter the pressure relaxing device 66 .

(6) When draining water from the dishwasher 18 , the drained water flows into the siphon drain pipe 30 through the primary drain well 202 , the temporary storage part 204 and the upright part 208 . When the inside of the siphon drain pipe 30 becomes full, a siphon force is generated to suck the drained water to the downstream side. Since the second drainage system 2 is provided with the temporary storage part 204, even if the drainage pressure of the dishwasher 18 is very large and the flow rate of the drainage increases, the temporary storage part 204 can still receive the drainage and thereby release it. Drainage pressure. So, from row 18 of the dishwasher When water is used, it is possible to suppress the drainage from flowing backward toward the first water machine side connected to the upstream side of the dishwasher 18 .

In addition, since the inlet 204A of the temporary storage part 204 takes the transverse direction as the axis direction, and the axis X1 of the inlet 204A is eccentric with respect to the axis Z of the temporary storage part 204 (Fig. 11), the temporary storage part may easily be damaged. Replacement of air and drainage 242 in 204. Specifically, since the drain 242 flows downward along the inner wall of the temporary storage portion 204, the drain 242 is less likely to encounter air resistance when flowing in. Therefore, the drainage water 242 will flow into the temporary storage part 204 smoothly. Thereby, the discharge of air from the temporary storage part 204 can be suppressed. In addition, by this, the inflow of air to the first water machine side can be reduced, thereby suppressing an increase in pressure on the first water machine side.

In addition, since the outlet 204B of the temporary storage part 204 has the transverse direction as the axis direction, and the axis X2 of the outlet 204B is not eccentric with respect to the axis Z of the temporary storage part 204 (Fig. 11), the water flows into the temporary storage part. The drainage 242 of 204 will become easy to collect at the outlet 204B. In addition, since the inner surface of the temporary storage portion 204 is on the opposite side to the outlet 204B in the axial direction of the outlet 204B, when the drain 242 is discharged from the temporary storage portion 204, the drain 242 will be directed toward the outlet 204B. Since the ground is curved, the drainage water 242 flowing down along the inner surface opposite to the outlet 204B becomes easy to collect at the outlet 204B. Therefore, the outflow of the drainage water 242 from the outlet 204B becomes smooth.

In FIGS. 17 and 18 , when the generation of the siphon force ends, in the second drainage system 2 , the air will remain in the upstream part of the temporary storage part 204 from the primary drainage well 202 , and the air will be transferred from the temporary storage part 204 From the downstream side to the upright portion 208, the drainage 242 remains. Specifically, the upright portion 208 on the downstream side of the temporary storage portion 204 is formed with sealing water having a sealing water height H1. On the other hand, since the upstream side of the temporary storage part 204 in the second drainage system 2 is blocked by the primary drainage trap 202, as the drainage water 242 remaining in the temporary storage part 204 moves to the downstream side (the water level decreases), Then, the air remaining in the temporary storage part 204 from the primary drain well 202 will expand. Then, the water level in the temporary storage part 204 will drop to the point where the head pressure H2 of the drainage water 242 remaining in the temporary storage part 204 (the force of the drainage water to move downstream) is equal to the amount of water from the primary drainage well 202 to the upstream part of the temporary storage part 204 The position where the negative pressure caused by the expansion of air on the side (which hinders the force of drainage moving to the downstream side) is balanced. That is, the water level in the temporary storage part 204 will drop to a position where drainage becomes unable to cross the uppermost part 208D of the upright part 208 due to the negative pressure caused by the expansion of the air. In other words, the temporary storage unit 204 stores the drainage water 242 of the water level.

In addition, since the secondary drainage well 203 different from the primary drainage well 202 is provided, the pipe on the upstream side of the temporary storage part 204 becomes easily closed. Thereby, the negative pressure for storing the drained water in the temporary storage part 204 can be stably generated in the pipe.

Thereby, since the pipeline from a part of the temporary storage part 204 to the upright part 208 will be filled with the drainage water 242, less air can be maintained in the pipeline from the upright part 208 to the siphon drain pipe 30. In addition, by this, when the water is drained from the dishwasher 18 next time, the inflow of air into the first water machine side can be reduced to suppress the pressure increase on the first water machine side. In addition, since the water surface of the drainage water 242 retained in the temporary storage part 204 can be kept constant without repeated wetting and drying, it is difficult for dirt to accumulate in the temporary storage part 204.

In addition, since the temporary storage part 204 is a part of the second drainage system 2 where the volume per unit length is partially expanded, the interior of the temporary storage part 204 will not become dense due to the drainage water 242 . Therefore, the siphon force almost reaches the upstream side (dishwasher 18 side) of the temporary storage part 204, and it is difficult to destroy the sealing water of the primary drain well 202 or the sealing water of the secondary drain well 203.

In addition, since the uppermost portion 208D of the upright portion 208 is set at a position higher than the height of the outlet 204B of the temporary storage portion 204, it is easy to be filled with drainage water from the temporary storage portion 204 to the upright portion 208.

In addition, since the second drainage system 2 is provided with the pressure reducing pipe 206, even if the drainage pressure of the dishwasher 18 is large and the flow rate of the drainage 242 is increased, the pressure reducing pipe 206 can still be used to reduce the drainage pressure, thereby reducing Drainage speed. Therefore, when draining water from the dishwasher 18, it is possible to suppress the drain 242 from flowing back toward the first water machine side connected upstream of the dishwasher 18.

In the pressure reduction pipe 206 related to Modification 1 of FIGS. 9 , 13 , and 14 , when the drain water passes through the bent pipe, pressure loss can be caused in the drain water. In the pressure reduction pipe 206 related to Modification 2 of FIG. 15 , when the drain 242 passes through a pipe whose inner diameter changes to a small diameter, a pressure loss can occur in the drain. Therefore, the drainage pressure can be reduced. In the pressure reduction pipe 206 related to Modification 3 of FIG. 16 , a pressure loss can be caused in the drainage by causing part of the drainage to enter the branch pipe 236 . Therefore, the drainage pressure can be reduced. In this way, by using various pressure reducing pipes 206, the drainage pressure can be reduced.

In this way, according to this embodiment, in a drainage pipe structure in which a plurality of water machines are connected to one siphon drain pipe 30, when water is drained from the water machine connected to the downstream side, the upward direction can be suppressed. The counterflow on the upstream side of the water machine increases the pressure on the water machine side.

[Second Modification of the Rectifier Assembly and Second Modification of the Pressure Relaxation Device]

Next, a second modification of the pressure relaxing device 66 described in the above embodiment and a second modification of the rectifying assembly 58 will be described with reference to FIGS. 19 to 21 .

(Second modification of rectifier assembly)

The entire rectifying component 300 related to the second modification shown in FIGS. 19 to 21 is made of elastomer such as rubber or synthetic resin and is elastically deformable. The rectification assembly 300 includes a barrel portion 300A inserted into the pressure relaxing device mounting portion 56 .

A flange 300C is formed on the upper end of the barrel portion 300A. The rectifying assembly 300 is fixed to the pressure relaxing device mounting portion by clamping the flange 300C between the lower end of the insertion tube portion 82 of the pressure relaxing device 66 and the step portion formed by the inner peripheral surface of the pressure relaxing device mounting portion 56 56.

As shown in FIGS. 19 and 20 , an opening 302 is formed at the lower end of the cylindrical portion 300A and is inclined relative to the axis of the cylindrical portion 300A. The opening 302 is inclined upward so that the upstream side in the drainage direction is higher than the downstream side in the drainage direction. Therefore, the opening 302 has a substantially elliptical shape when viewed from above (not shown).

One end of a fin 300B is integrally connected to the upper end side of the opening 302 , and the fin 300B functions as a valve body that opens and closes the opening 302 . The connecting portion 304 between one end portion of the fin 300B and the opening 302 functions as a hinge, and the fin 300B can swing (in the direction of arrow A in Figure 19 and in the opposite direction to the direction of arrow A) by using the connecting portion 304 as a fulcrum. Open and close the opening 302. In addition, since the fin portion 300B closes the opening 302, it has the same substantially elliptical shape as the opening 302.

As shown in FIG. 19 , the fin portion 300B in a normal state (a free state in which drainage does not flow) protrudes from the inside of the second descending curved pipe portion 42B. To explain in more detail, when the opening portion of the pressure relaxing device mounting portion 56 provided in the second descending curved tube portion 42B is set with an imaginary line FL connected to the inner peripheral surface of the second descending curved tube portion 42B, then the fin portion 300B Then, it protrudes inward of the second descending curved tube portion 42B from the imaginary line FL.

In addition, in this embodiment, although the fin portion 300B is made to protrude further inward of the second descending curved tube portion 42B than the imaginary line FL, the fin portion 300B may be made to protrude as needed, or the fin part 300B may not be made to protrude. protrude.

At normal times, a slot S as a gap is provided between the opening 302 and the fin 300B, and at normal times, the fin 300B is separated from the opening 302 . Therefore, in the normal rectification assembly 300, air can pass through the cylindrical portion 300A in the up and down direction.

The fin portion 300B is inclined relative to the vertical direction so as to guide the drainage direction flowing from the upstream kitchen sink 16 toward the reduced diameter pipe portion 44 side. In other words, the fin portion 300B has the function of directing the flow of drainage water toward the oblique lower side of the downstream side in the drainage direction, so that the drainage water flowing from the upstream side is less likely to flow toward the pressure relaxing device 66 side. In addition, since the fin portion 300B is curved in the same manner as the second descending curved pipe portion 42B, so that the drainage water flows along the curved fin portion 300B, the flow of the drainage water is not hindered under normal circumstances.

In addition, when a large amount of water is temporarily discharged from the kitchen sink 16 to the fin portion 300B protruding from the inside of the second descending curved pipe portion 42B (for example, when a large amount of water accumulated in the kitchen sink 16 is discharged at once) . So-called water accumulation.), the fin portion 300B will be pressed by a large amount of drainage and sway in the direction of arrow A, thereby closing the opening 302. Thereby, the drainage water discharged from the kitchen sink 16 can be suppressed from flowing back toward the pressure relaxation device 66 side, and the drainage water discharged from the kitchen sink 16 can be efficiently caused to flow downstream.

When the fin 300B is pressed by a large amount of drainage water and swings in the direction of arrow A, and contacts the opening 302 to close the opening 302, in other words, when the opening 302 is closed, as shown by the two-point chain line in Figure 19 In this way, the fin portion 300B does not enter the inside of the tube portion 300A through the opening portion 302, but protrudes toward the outside of the opening portion 302 (the inside side of the second descending curved tube portion 42B). The size of the fin 300B (for example, the length of the long axis of the elliptical shape) is set to be larger than the opening 302 .

Assume that the size of the fin 300B is smaller than the opening 302, and the fin 300B, which is pressed by the drainage, will enter the inside of the tube 300A through the opening 302, and the fin 300B will get stuck inside the tube 300A. When the drainage becomes stagnant, there is a concern that the fin 300B will not return to its original position.

In addition, in this embodiment, when the opening 302 is closed with the fin 300B, a part of the fin 300B will protrude toward the outside of the opening 302. However, if the fin 300B is pressed due to drainage, the fin 300B will be pressed. 300B does not enter the inside of the tube part 300A. When the drainage becomes unable to flow, the fin part 300B only needs to be returned to the original position.

For example, when the fin portion 300B is pressed due to drainage and closes the opening 302, the surface of the fin portion 300B can be aligned with the imaginary line FL connected to the inner peripheral surface of the second descending curved tube portion 42B.

When a large amount of drainage flows and closes the opening 302, if the surface of the fin portion 300B is aligned with the imaginary line FL connected to the inner peripheral surface of the second descending curved tube portion 42B, the inside of the second descending curved tube portion 42B will not This creates a step that acts as a resistance to the flow of drainage water, allowing a large amount of drainage water to flow more efficiently.

As shown in FIGS. 19 and 21 , a plurality of ribs 306 are formed on the outer surface of the fin portion 300B, in other words, the inner outer surface facing the second descending curved tube portion 42B. The ribs 306 extend along the longitudinal direction of the second descending curved pipe portion 42B (in other words, the flow of drain water).

If the outer surface of the fin 300B is flat, dirt in the drainage (for example, dirt as thin as an onion skin and easy to adhere to) will be easy to adhere to. However, if the outer surface of the fin 300B is formed with a plurality of ribs, 306. Since the contact area between the fins 300B and dirt is reduced, dirt will only contact the ribs 306, which can prevent dirt from adhering (in other words, sticking closely) to the fins 300B. In addition, as long as it is suitable for suppressing dirt in the drainage, the ribs 306 may be replaced by protrusions of other shapes such as hemispherical shapes on the outer surface of the fin 300B.

(Second modification of pressure relaxing device)

Next, the pressure relaxing device 400 related to the second modification will be described based on FIGS. 22 to 29 .

As shown in FIGS. 22 to 24 , the pressure relaxing device 400 related to the second modification is provided with a thin-walled elastic expansion and contraction body 468 made of elastic material such as rubber, and supports the lower end side of the elastic expansion and contraction body 468 . The support component 470 supports the upper support component 472 on the upper end side of the elastic expansion and contraction body 468, the cover body 474, and the like.

As shown in Figures 25 and 26, the elastic expansion and contraction body 468 is a cylindrical body having an outlet and an inlet. The elastic expansion and contraction body 468 has a cross-shaped cylindrical expansion and contraction part 468A when viewed from the axial direction, and the expansion and contraction part 468A has four expansion and contraction pieces 488 extending in the radial direction (radially outward) from the axis. Therefore, a space S having a cross-shaped cross section and extending in the axial direction is provided inside the expansion and contraction portion 468A.

Both axial ends of the expansion and contraction portion 468A are integrally formed with a base portion 468B having a circular outer shape. The outer peripheral portion of the base 468B is integrally formed to mount the elastic expansion and contraction body 468 to the lower support assembly. 470 and the annular mounting portion 468C of the upper support component 472. In addition, a thick rib 468D is formed at the end of the mounting portion 468C.

As shown in FIG. 26(B) , the expansion and contraction piece 488 has a pair of wall portions 488A arranged parallel to each other and spaced apart from each other. The pair of wall portions 488A connect the radially outer end portions to each other through the connecting wall 488B. .

In addition, one adjacent expansion piece 488 and the other expansion piece 488 are connected to each other by adjacent wall surfaces 488A through an arc wall portion 488C having an arc shape in cross section.

Here, as shown in FIG. 26(B) , the axial middle portion of the elastic expansion and contraction body 468 is cut in a direction that crosses the axis, and when viewed from the axial direction, one of the expansion and contraction pieces 488 faces the wall portion. When the interval 488A is A and the diameter of the virtual inscribed circle FC inscribed in the four arc wall portions 488C at the center of the elastic expansion and contraction body 468 is B, the interval A < diameter B is satisfied.

As shown in FIG. 25 , the corner portion 490 formed by the wall portion 488A of one expansion piece 488 and the wall portion 488A of the other expansion piece 488 and the base portion 468B is formed with a sliding groove that slides from the base portion 468B toward the wall portion 488A. The upright portion 492 stands upright and has an arc shape in cross-section (or can also be an inclined surface that is inclined relative to the base portion 468B). As shown in FIG. 26(A) , the rising portion 492 has a substantially triangular shape when viewed from the axial direction.

In the portion where the rising portion 492 is formed, the diameter B (see FIG. 26(B) ) of the virtual inscribed circle FC gradually increases toward the axially outer side.

If the pressure of the internal space S of the expansion and contraction portion 468A is higher than the external pressure (atmospheric pressure), the portion recessed radially inward will expand to the radially outer side (for example, in the direction of the arrow shown in FIG. 26(B) ). .

Assuming that the expansion and contraction part 468A has a cylindrical shape, in order for the expansion and contraction part 468A to expand radially outward, the elastic component itself that constitutes the expansion and contraction part 468A must be stretched. In other words, when the expansion and contraction part 468A is expanded, the internal pressure of the expansion and contraction part 468A must be made considerably large.

On the other hand, as shown in FIG. 26(B) , the expansion and contraction portion 468A of this embodiment has a cross-sectional shape. Therefore, during the expansion process, the portion that is recessed toward the radially inner side will expand toward the inside due to the internal pressure. When the radially outer side is pressed, the shape of the expansion and contraction portion 468A will be deformed, but compared to the case where the expansion and contraction portion 468A has a cylindrical shape, the tension will only be slightly exerted on the elastic body itself.

Therefore, when air flows in, the volume of the expansion and contraction portion 468A can be easily expanded, and the increase in internal pressure can be suppressed more compared to the case where the expansion and contraction portion 468A has a cylindrical shape.

In addition, if the rising portion 492 is formed at the corner portion 490 of the elastic expansion and contraction body 468 as in this embodiment, compared with the case where the rising portion 492 is not formed at the corner portion 490, in other words, the corner portion 490 When one wall portion 488A, the other wall portion 488A, and the base portion 468B are connected at right angles to each other, the expansion and contraction portion 468A becomes easier to expand to the outside, and it becomes easier to suppress an increase in internal pressure.

On the other hand, if the downstream side of the pipe well 24 in the drainage direction becomes a negative pressure and the pressure of the space S inside the expansion and contraction part 468A is lower than the external pressure (atmospheric pressure), as shown in FIG. 26(C) , There are cases where one wall portion 488A and the other wall portion 488A of the expansion and contraction piece 488 that face each other are in close contact with each other. However, the axial center part of the expansion and contraction part 468A is surrounded by the four arc wall parts 488C and linearly penetrates the outlet and the inlet of the elastic expansion and contraction body 468 through the space S1 (which is part of the space S and will become a passage for air. The shape, size (radius of curvature), etc. of the arcuate wall portion 488C are set in such a way that a gap) will remain.

That is, when the internal space S becomes a negative pressure, the expansion and contraction portion 468A suppresses the inner peripheral surfaces from being in close contact with each other and allows the space S to completely disappear. Therefore, in the elastic expansion and contraction body 468 of this embodiment, even if the internal space S becomes a negative pressure, the penetration space S1 inserted in the axial direction can still be ensured, so ventilation can be performed in the axial direction.

As shown in FIGS. 23 , 24 and 27 , the lower support assembly 470 is inserted into the mounting portion 468C on the lower side of the elastic expansion and contraction body 468 . The mounting portion 468C is held between the lower support component 470 and the mounting ring 496 disposed outside the mounting portion 468C, and is fixed to the lower support component 470 . In addition, the ribs 468D of the mounting portion 468C are inserted into the annular groove 478 formed on the outer periphery of the lower support component 470 and compressed.

In addition, the upper support component 472 is inserted into the mounting part 468C on the upper side of the elastic expansion and contraction body 468. The mounting part 468C is held between the upper support component 472 and the mounting ring 496 arranged outside the mounting part 468C, and is fixed to the mounting part 468C. Upper support assembly 472. In addition, the ribs 468D of the mounting portion 468C are inserted into the annular groove 478 formed on the outer periphery of the upper support component 472 and compressed.

As shown in FIGS. 22 and 28 , the cylindrical cover 474 is composed of a first half component 474A on one side and a second half component 474B on the other side with the axis interposed therebetween. The cover 474 of this embodiment is a synthetic resin molded product (an example is an injection molded product).

The first half unit 474A has an arc wall portion 474Aa that bisects the cylinder, and has an arc-shaped flange 474Ab formed at the upper end and an arc-shaped flange 474Ac formed at the lower end.

The second half unit 474B is provided with an arc wall portion 474Ba that bisects the cylinder, and has an arc-shaped flange 474Bb formed at the upper end and an arc-shaped flange 474Bc formed at the lower end (see FIG. 23 ).

A plurality of claw assemblies 474Ae are formed at the inner end of the arc wall portion 474Aa of the first half-section assembly 474A. The claw assembly 474Ae protrudes toward the inner surface side of the arcuate wall portion 474Ba of the second half-section assembly 474B, and is caught in the engaging hole 474Bd formed in the arcuate wall portion 474Ba of the second half-section assembly 474B.

In addition, a plurality of claw assemblies 474Be are formed at the end on the inner surface side of the arcuate wall portion 474Ba of the second half unit 474B. The claw component 474Be protrudes toward the inner surface side of the arcuate wall part 474Aa of the first half-section component 474A, and is caught in the engaging hole 474Ad formed by the arcuate wall part 474Aa of the first half-section component 474A.

The first half-divided component 474A and the second half-divided component 474B face each other, and the claw component 474Be is stuck in the engaging hole 474Ad, and the claw component 474Ae is stuck in the engaging hole 474Bd, thereby making the first half-divided component 474A face-to-face. The assembly 474A and the second half assembly 474B are fixed to each other to form a cylindrical cover 474.

As shown in FIG. 28 , both axial sides of the inner circumference of the first half-divided component 474A are adjacent to the flange to form a groove 474Af, and the axial two sides of the inner circumference of the second half-divided component 474B are adjacent to each other. A groove 474Bf is formed on the flange. As shown in FIG. 23 , the mounting ring 496 for fixing the elastic expansion and contraction body 468 is inserted into the groove 474Af of the first half-section component 474A and the groove 474Bf of the second half-section component 474B.

Thereby, the mounting ring 496 fixing the upper side of the elastic expansion and contraction body 468 will be caught in the step formed by the width direction end of the groove 474Af on the upper side of the cover 474, and the step formed by the width direction end of the groove 474Bf. Staircase. In addition, the mounting ring 496 fixing the lower side of the elastic expansion and contraction body 468 will be caught in the step formed by the width direction end of the groove 474Af on the lower side of the cover 474, and the step formed by the width direction end of the groove 474Bf. Staircase. Thereby, the elastic expansion and contraction body 468 installed with the lower support component 470 and the upper support component 472 is fixed inside the cover body 474 .

Since the upper support component 472 and the lower support component 470 of the fixed elastic expansion and contraction body 468 are fixed inside the cover 474 as described above, even if the elastic expansion and contraction body 468 is deformed due to changes in internal pressure, The axial movement of the elastic expansion and contraction body 468 can still be suppressed.

The elastic expansion and contraction body 468 is covered by the cover 474 from the expansion and contraction direction of the elastic expansion and contraction body 468 (the direction that is intersecting with the axial direction of the elastic expansion and contraction body 468), and the axial direction that is intersecting with the expansion and contraction direction. Down The side support component 470 and the upper support component 472 are protected in a manner that they do not come into contact with components other than the cover 474 .

In addition, when the elastic expansion and contraction body 468 expands or contracts inside the cover body 474, the first half-section component 474A and the second half-section component 474B are formed with slots 474g on the lower side in the axial direction, so that Air can enter and exit between the space S2 between the cover body 474 and the elastic expansion and contraction body 468 and the external air outside the cover body 474 . Thereby, the elastic expansion and contraction body 468 can be easily expanded or contracted.

A tapered through hole 480 is formed in the center of the lower support component 470 , and an insertion tube portion 482 that communicates with the through hole 480 protrudes downward at the center of the lower support component 470 . The insertion pipe portion 482 is inserted into the pressure relaxing device mounting portion 56 of the pipe trap 24 to install the pressure relaxing device 400 on the pipe trap 24 .

As shown in FIGS. 23 and 27 , a cylindrical check valve mounting portion 486 protrudes upward from the center of the upper support assembly 472 . A male thread 486A is formed on the outer periphery of the check valve mounting portion 486, and the vent valve 110 is mounted on the check valve mounting portion 486 through the male thread 486A.

As shown in FIG. 27 , a plurality of ribs 502 protruding radially inward and extending in the axial direction are formed on the inner peripheral surface of the check valve mounting portion 486 . Thereby, as shown in FIG. 29(A) , a gap S3 for air circulation is formed in the axial direction between the later-described valve body 412 and the inner peripheral surface of the check valve mounting portion 86 .

As shown in FIGS. 27 and 29 , a valve body support portion 504 is formed at the lower end of the check valve mounting portion 86 so that the valve body 412 described later will not fall to the pressure relaxing device 466 below. In addition, the valve body support portion 504 is formed with a plurality of holes 506 that allow air to pass through.

As shown in FIGS. 23 and 29(A) , the valve body 412 is arranged on the valve body support part 504 inside the check valve mounting part 486 . The specific gravity of the valve body 412 is set so that it will float on the drain water.

The valve body 412 is generally formed into a substantially truncated cone shape. The valve body 412 is formed with an annular recessed portion 412A having an arc-shaped cross section on the radially outer portion of the upper side.

An annular valve seat 508 made of elastic material such as rubber is mounted on the upper portion of the check valve mounting portion 486 .

As shown in FIG. 29(A) , in normal times, the valve body 412 disposed on the valve body support part 504 is separated from the valve seat 508 to allow air to flow through the gap S4 between the valve body 412 and the valve seat 508 . in the up and down direction.

On the other hand, when the drain water that flows back and rises from the pressure relaxing device 466 below reaches the valve body 412, as shown in FIG. 29(B), the valve seat 412 floats on the drain water (not shown in the figure) and contacts the valve seat 508. , to close the valve hole 508A formed in the center of the valve seat 508.

Therefore, even if the drainage water penetrates into the inside of the pressure relaxation device 466, the drainage water that flows back from the pressure relaxation device 466 and rises can be suppressed from flowing into the vent valve 110 disposed above.

As shown in FIG. 27 , the outer peripheral portion of the upper support component 472 is formed with a plurality of protrusions 472A (only one is shown in FIG. 27 ) protruding radially outward. As shown in FIG. 22 , the protrusions 472A are inserted into the first The fitting hole 510 formed by the half-divided component 474A and the second half-divided component 474B. As a result, the upper support component 472 and the cover 474 cannot rotate relative to each other.

In addition, the above-mentioned protrusions 472A are not formed on the outer peripheral portion of the lower support component 474 . Therefore, the lower support assembly 474 can rotate relative to the cover 474 in a state where the mounting ring 496 is inserted into the groove 474Af and the groove 474Bf of the cover 474 to prevent axial movement.

(Sequence of Assembling Steps of Pressure Relaxation Device 400)

The pressure relaxing device 400 is assembled as follows, for example.

(1) Use the installation ring 496 to install the upper support assembly 472 on one axial side of the elastic expansion and contraction body 468, and use the installation ring 496 to install the lower support assembly 474 on the other axial side of the elastic expansion and contraction body 468. side.

(2) Arrange the elastic expansion and contraction body 468 with the upper support assembly 472 and the lower support assembly 474 between the first half-section assembly 474A and the second half-section assembly 474B facing each other, and the upper side The protrusion 472A of the support component 472 is inserted into the fitting hole 510 to combine the first half component 474A and the second half component 474B.

(3) Insert the valve body 412 into the check valve mounting part 486, and install the valve seat 508 on the upper part of the check valve mounting part 486.

(4) Finally, lock the vent valve 110 into the check valve mounting portion 486 of the upper support assembly 472 to fix the vent valve 110 to the check valve mounting portion 486 . At this time, you can hold and fix the cover 474 of the pressure relaxing device 400 with one hand, and hold the vent valve 110 with the other hand and lock the vent valve 110 into the check valve mounting portion 486 . Since the upper support assembly 472 and the cover body 474 are installed so as not to rotate relative to each other, as long as the cover body 474 is held and fixed by hand, when the vent valve 110 is locked into the check valve mounting portion 486, the upper support assembly 472 It will not rotate.

(5) Insert the insertion tube portion 482 of the pressure relaxing device 466 equipped with the vent valve 110 into the pressure relaxing device mounting portion 56 of the pipe trap 24 to install the pressure relaxing device 400 on the pipe trap 24 .

In addition, in the pressure relaxing device 400 of this embodiment, the lower support component 474 is relatively rotatable relative to the cover body 474 . However, if the same protrusion 472A as that of the upper support component 472 is formed on the outer peripheral portion of the lower support component 474, and the protrusion 472A is inserted into the fitting hole 510 of the cover 474, the lower support component 474 and the cover 474 are unable to connect. For relative rotation, it is necessary to pay attention to the assembly of the pressure relaxing device 400 as follows.

Since the first half component 474A and the second half component 474B are molded products, the positions of the upper fitting hole 510 and the lower fitting hole 510 are already determined. That is, the circumferential positional relationship between the upper fitting hole 510 and the lower fitting hole 510 has been determined.

Therefore, when the lower support component 470 and the upper support component 472 are installed on the elastic expansion and contraction body 468, they must match the two fitting holes 510 formed by the first half-section component 474A and the second half-section component 474B. The circumferential positional relationship (circumferential angle) between the protrusion 472A of the lower support component 470 and the protrusion 472A of the upper support component 472 is determined by the positional relationship.

Here, when installed on the elastic expansion and contraction body 468, the circumferential positional relationship between the protrusion 472A of the lower support component 470 and the protrusion 472A of the upper support component 472 is not consistent with the first half-section component 474A and the second half-section component 474A. In the case of the circumferential positional relationship between the upper fitting hole 510 and the lower fitting hole 510 formed by the sub-assembly 474B, the lower support assembly 470 and the upper support assembly 472 must be circumferentially twisted to make the positional relationship consistent. Then, each protrusion 472A is inserted into each fitting hole 510 .

Although the cover body 474 can be installed in this way, if the elastic expansion and contraction body 468 is fixed inside the cover body 474 in a twisted state, useless deformation (distortion) will remain in the elastic expansion and contraction body 468, and there will be Problems such as the elastic expansion and contraction body 468 becoming difficult to expand or contract may occur.

On the other hand, in the pressure relaxing device 400 of this embodiment, since the lower support component 474 is not formed with the protrusion 472A inserted into the fitting hole 510, it is only necessary to align the protrusion 472A of the upper support component 472 with the first half By combining the first half-section component 474A and the second half-section component 474B through the fitting hole 510 formed on the upper side of the equally divided component 474A and the second half-section component 474B, the elastic expansion and contraction body can be assembled without twisting. 468 is fixed inside the cover body 474. Thereby, the installation of the cover body 474 becomes easy, and the expansion and contraction performance of the elastic expansion and contraction body 468 can be ensured.

[Other implementation types]

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned embodiment. Of course, various modifications can be made in addition to the above-mentioned embodiments within the scope that does not deviate from the gist. be implemented.

In the above embodiment, the kitchen sink 16 is equivalent to the first water machine of the present invention, and the dishwasher 18 is equivalent to the second water machine of the present invention. However, as long as the first water machine and the second water machine are capable of For those who perform drainage, the type is not particularly limited. Examples of the water appliance include a washstand, a washing machine, a bathtub, a shower room, etc., but other appliances may also be used.

In the drain pipe structure 10 of the above embodiment, although the kitchen sink 16 is provided with the processor 20, it may not be provided with the processor 20.

In the above embodiment, the vent valve 110 is used as an example of the vent part, but the present invention is not limited to this. As long as there is a negative pressure in the pipe on the downstream side of the pipe trap 24, outside air can be introduced. To suppress the negative pressure, other structures may be used instead of the vent valve. For example, instead of the vent valve 110 , one end of the pipe may be connected to the pressure relaxing device 66 , and the other end of the pipe may be connected to the drainage riser 34 . In this case, the air inside the drainage riser 34 can be introduced into the pipe on the downstream side of the pipe trap 24 to suppress the negative pressure in the pipe.

The pressure alleviating device 66 and the vent valve 110 may be provided as needed, or may not be provided as long as they can inhibit unsealing.

Although the temporary storage part 204 is formed in a cylindrical shape with the up-down direction as the axis direction, the shape is not limited to this, and may be any shape such as a rectangular parallelepiped. Moreover, although the axis X1 of the inlet 204A is eccentric with respect to the axis Z of the temporary storage part 204, it may not be eccentric. Although the axis X2 of the outlet 204B is not eccentric with respect to the axis Z of the temporary storage part 204, it may be eccentric.

Although the upright portion 208 is provided between the temporary storage portion 204 and the siphon drainage pipe 30 in the second drainage system 2, the upright portion 208 may not be provided. Moreover, although the pressure reduction pipe 206 is provided between the temporary storage part 204 and the upright part 208 in the 2nd drainage system 2, it may be a structure in which this pressure reduction pipe 206 is not provided.

1: 1st drainage system

2: 2nd drainage system

10: Drainage pipe structure

12:Floor

14:Floor

16:Kitchen sink

16A: Drainage outlet

18: Dishwasher

20: Processor

22:Piping

24: Water-sealed pipe trap

26:Piping

28:Business joint

30:Siphon drain pipe

30A: Horizontal tube

30B: Standpipe

32: Longitudinal hole

34: Drainage riser

65: Pressure adjustment device

66: Pressure relieving device

90: Check valve

110: Ventilation valve

202: Primary drainage trap

203:Secondary drainage trap

204: Temporary storage department

206: Pressure reduction piping

208:Pars erectus

210, 212: Piping

Claims (7)

A drainage pipe structure having: a first drainage system that allows drainage from a first water machine to flow; a second drainage system that allows drainage from a second water machine to flow; and a siphon drainage pipe connected to the upstream side There is the first drainage system, and the second drainage system is connected to the downstream side of the first drainage system; the pressure reduction pipe is installed in the second drainage system, which will reduce the drainage in the second drainage system. pressure; and a temporary storage part is provided in the second drainage system, and the inlet is provided at a higher position than the outlet, so that the volume per unit length in the second drainage system is partially expanded, and The inlet is formed into a cylindrical shape with the vertical direction as the axial direction; the inlet is formed into a cylindrical shape with the transverse direction as the axial direction; the axis of the inlet is eccentric with respect to the axis of the temporary storage portion; the outlet is formed It has a cylindrical shape with the transverse direction as the axis; the axis of the outlet is not eccentric with respect to the axis of the temporary storage part. A drainage pipe structure having: a first drainage system that allows drainage from a first water machine to flow; a second drainage system that allows drainage from a second water machine to flow; and a siphon drainage pipe connected to the upstream side There is the first drainage system, and the second drainage system is connected to the downstream side of the first drainage system; and the pressure reducing pipe is installed in the second drainage system, which will reduce the pressure in the second drainage system. Drainage pressure; between the pressure reduction pipe and the siphon drainage pipe in the second drainage system, there is an upright portion that first descends and then rises. For example, in the drainage pipe structure of Item 1 or 2 of the patent application, the pressure reducing piping system has a bent pipe. For example, in the drainage pipe structure of Item 1 or 2 of the patent application, the pressure reduction piping system has a pipe whose inner diameter can be changed to a small diameter. For example, if the drainage pipe structure of item 1 or 2 of the patent scope is applied for, the pressure is reduced The piping system has branch pipes that diverge from upstream to downstream and have closed ends. A drainage pipe structure having: a first drainage system that allows drainage from a first water machine to flow; a second drainage system that allows drainage from a second water machine to flow; and a siphon drainage pipe connected to the upstream side There is the first drainage system, and the second drainage system is connected to the downstream side of the first drainage system; and the pressure reducing pipe is installed in the second drainage system, which will reduce the pressure in the second drainage system. Drainage pressure; the first drainage system is provided with a first drainage trap; the first drainage trap has: an inflow portion for allowing the inflowing drainage to circulate downward; and a first descending curved pipe portion provided below the inflow portion , and is bent downward from the vertical upper side toward the horizontal direction; the first ascending curved pipe portion is provided on the drainage downstream side of the first descending curved pipe portion, and is curved upward from the horizontal direction toward the vertical direction upper side; 2. The ascending curved pipe part is provided on the downstream side of the first ascending curved pipe part in the drainage direction, and is curved upward from the lower side in the vertical direction toward the horizontal direction; the second descending curved pipe part is provided on the second ascending curved pipe part. The bent pipe portion is on the downstream side in the drainage direction and is bent downward from the horizontal direction toward the lower side in the vertical direction; and a pressure relaxing device is disposed above the second descending curved pipe portion and communicates with the second descending curve. The pipe part is used to relieve the pressure in the pipe; a vent part that can introduce air from the outside to the downstream side of the water sealing part of the first drainage trap is provided above the pressure relaxing device. For example, in the drainage pipe structure of claim 6, the connection line at the upstream end of the axis of the first descending curved pipe portion in the drainage direction has an angle relative to the axis of the inflow portion.

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