JP2017166560A - Constant flow valve - Google Patents

Abstract

A constant flow valve capable of stabilizing a flow rate is provided. A constant flow valve (1) adjusts the flow rate in water supply paths (83 and 86) as secondary flow paths to be constant by changing the flow channel area according to the pressure of the water supply path (82) as a primary flow path. To do. The piston 2 is pushed into the cylinder 3 by the pressure from the water supply passage 82. In the throttle portions 4a and 4b, the flow path area is narrowed when the piston 2 is pushed. The pressure adjusting chamber 31 is surrounded by the cylinder 3 and the bottom 21 of the piston 2, and the pressure increases when the piston 2 is pushed in. [Selection] Figure 3

Description

  The present invention relates to a constant flow valve.

  For example, in Patent Document 1, a valve body biased by a spring is accommodated in a cylindrical cylinder, and an opening provided on the circumference of the cylinder is partially blocked by a cylinder that moves together with the valve body. Discloses a constant flow valve for adjusting the flow rate. In the constant flow valve, an annular flow path is formed so as to surround the cylinder, and a secondary flow path is connected to the annular flow path.

JP 2011-179575 A

  However, in the constant flow valve described in Patent Document 1, the valve body is biased by a spring, and when the water pressure applied to the constant flow valve changes greatly, the valve body moves more than necessary and vibrates. There was a problem that the flow rate became unstable.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a constant flow valve capable of stabilizing the flow rate.

  The constant flow valve according to the present invention is a constant flow valve that adjusts the flow rate in the secondary side flow path by changing the flow path area according to the pressure of the primary side flow path. The piston is pushed into the cylinder by the pressure from the cylinder, the throttle part whose flow passage area is narrowed by the piston being pushed in, and the cylinder and the piston, and the pressure is increased by the piston being pushed in. And a pressure adjusting chamber.

  In the present invention, the constant flow valve adjusts the flow rate in the secondary flow path to be constant by changing the flow path area according to the pressure of the primary flow path. The piston is pushed into the cylinder by the pressure from the primary side flow path. The throttle portion has a narrow channel area when the piston is pushed in. The pressure adjusting chamber is surrounded by a cylinder and a piston, and the pressure is increased by pushing the piston. Thereby, when the piston moves, the constant flow valve can suppress the vibration of the piston by changing the pressure in the pressure adjusting chamber, and can stabilize the flow rate.

  According to the present invention, the constant flow valve can stabilize the flow rate by suppressing the vibration of the piston by changing the pressure in the pressure adjustment chamber when the piston moves.

It is sectional drawing which shows the toilet bowl using the toilet bowl washing | cleaning apparatus which concerns on Embodiment 1. FIG. It is a block which shows the structure of the toilet bowl washing | cleaning apparatus which concerns on Embodiment 1. FIG. 1 is a longitudinal sectional view of a constant flow valve according to a first embodiment. It is sectional drawing by the AA line shown in FIG. It is a schematic diagram for demonstrating the structure of another example of an adjustment hole. It is a longitudinal cross-sectional view which shows the operation state of a constant flow valve. It is sectional drawing by the BB line shown in FIG. It is a longitudinal cross-sectional view of the constant flow valve according to the second embodiment. It is sectional drawing by CC line shown in FIG. It is a longitudinal cross-sectional view which shows the operation state of a constant flow valve. It is sectional drawing by the DD line shown in FIG.

  Hereinafter, the present invention will be described based on preferred embodiments with reference to FIGS. 1 to 11. The same or equivalent components and members shown in the drawings are denoted by the same reference numerals, and repeated descriptions are appropriately omitted. In addition, the dimensions of the members in each drawing are appropriately enlarged or reduced for easy understanding. In addition, in the drawings, some of the members that are not important for describing the embodiment are omitted.

(Embodiment 1)
FIG. 1 is a cross-sectional view illustrating a toilet 110 using the toilet bowl cleaning device 100 according to the first embodiment. The toilet 110 includes a toilet bowl 111, a rim water passage 112, a rim water discharge device 113, a toilet drainage channel 114, and a jet water discharge device 115.

  The rim water passage 112 is provided in a shelf shape on the inner peripheral edge of the upper end opening of the toilet bowl 111. The rim water spouting tool 113 is disposed on the left rear side of the toilet bowl 111 as viewed from the front end F side of the toilet bowl 111. The rim water spouting tool 113 is connected to the downstream water supply passage 87. The washing water discharged from the rim water spouting tool 113 flows along the bowl surface 121 in the toilet bowl 111 while turning in one direction along the rim water passage 112 around the upper edge of the toilet bowl 111. For this reason, when washing water is discharged from the rim water spouting tool 113, the level of the washing water in the toilet bowl 111 increases while forming a swirling flow toward the central part in the toilet bowl 111. Similarly, when the toilet bowl 110 is a urinal, water flows along the bowl surface of the toilet bowl.

  The toilet drainage channel 114 is provided continuously downstream of the toilet bowl 111. The toilet drainage channel 114 includes an ascending channel extending rearward and obliquely upward from the lower part of the toilet bowl 111, and a descending channel bent from the upper end of the ascending channel and extending vertically downward. ing.

  The jet water spouting device 115 is attached to the upstream lower end portion of the ascending flow path of the toilet drainage channel 114. The jet water discharger 115 is connected to the downstream water supply channel 84. Wash water discharged from the jet water spouting device 115 flows downstream of the toilet drainage channel 114 while filling the rising channel of the toilet drainage channel 114.

  FIG. 2 is a block diagram illustrating a configuration of the toilet bowl cleaning apparatus 100 according to the first embodiment. The toilet bowl cleaning apparatus 100 includes a pressure reducing valve 91, a constant flow valve 1, a check valve 92, and on-off valves 93 and 94. The pressure reducing valve 91 is provided at the downstream end of the upstream water supply passage 81 that reaches the stop cock 101 on the water supply source side. The upstream water supply path 81 includes a strainer 102 for removing foreign matter and a flexible hose 103 for connection to the water stop cock 101. The pressure reducing valve 91 maintains the water pressure in the downstream water supply channel 82 at a value lower than that of the upstream water supply channel 81.

  The water supply path 82 is connected to the constant flow valve 1. The constant flow valve 1 is connected to the water supply path 82 as a primary side flow path, and is connected to the water supply paths 83 and 86 as secondary side flow paths. The constant flow valve 1 functions to adjust the flow rates of the water supply channels 83 and 86 that are the secondary flow paths to be constant with respect to the water pressure change of the water supply path 82 that is the primary flow path. The check valve 92 is provided in the middle of the water supply path 83 and allows flow from the constant flow valve 1 side to the on-off valve 93 side, but from the on-off valve 93 side to the constant flow valve 1 side. The flow stops. The downstream side of the on-off valve 93 is connected to the jet water discharger 115 by a downstream water supply channel 84. By opening the on-off valve 93, water flows through the upstream water supply path 81, the water supply path 82, the water supply path 83, and the downstream water supply path 84, and is discharged from the jet water spouting device 115.

  The pressure accumulator 95 is connected to the water supply channel 83 by the water supply / drainage channel 85. The pressure accumulator 95 discharges the water stored in the pressure accumulation state to the water supply channel 83 through the water supply / drainage channel 85 when the on-off valve 93 is opened, and jets through the water supply channel 83 and the downstream water supply channel 84. The flow rate discharged from the water discharger 115 is increased. The pressure accumulator 95 stores the water supplied from the water supply path 82 through the water supply / drainage path 85 in a pressure accumulation state when the on-off valve 93 is closed.

  On the other hand, the water supply path 86 that is the secondary side flow path of the constant flow valve 1 is connected to the on-off valve 94. The downstream side of the on-off valve 94 is connected to the rim water discharger 113 by a downstream water supply passage 87. By opening the on-off valve 94, water flows through the upstream water supply channel 81, the water supply channel 82, the water supply channel 86, and the downstream water supply channel 87, and is discharged from the rim water spouting device 113.

  3 is a longitudinal sectional view of the constant flow valve 1 according to the first embodiment, and FIG. 4 is a sectional view taken along line AA shown in FIG. The constant flow valve 1 has a piston 2 and a cylinder 3. The piston 2 has a cylindrical shape, one end on the side of the water supply channel 82 is opened, and water from the water supply channel 82 flows into the cylinder. The piston 2 is urged toward the water supply path 82 by a coil spring 11 provided between the piston 2 and the cylinder 3. The piston 2 has a bottom 21 at the other end. The bottom portion 21 has a small hole 21 a penetrating the front and back at the center, and is fitted to the cylinder 3. The bottom 21 and the cylinder 3 form a pressure adjustment chamber 31. The piston 2 has openings 22a and 22b from the bottom 21 to the middle part on the circumferential side. The openings 22 a and 22 b are provided in a part of the circumference on the circumferential side portion of the piston 2. The opening 22a faces the water supply channel 83 and has a rectangular shape when viewed from the water supply channel 83 side. The opening 22b faces the water supply channel 86 and has a rectangular shape when viewed from the water supply channel 86 side.

  The cylinder 3 has a cylindrical shape and is fixed in a housing 13 that forms a secondary side flow path. The cylinder 3 has a pressure adjustment chamber 31 surrounded by the bottom 21 of the piston 2 inside, and openings 32a and 32b are formed at positions corresponding to the openings 22a and 22b of the piston 2 in the middle part of the circumferential side. Has been. The openings 32 a and 32 b are provided in a part of the circumference on the circumferential side portion of the cylinder 3. The opening 32a faces the water supply channel 83, has a trapezoidal shape when viewed from the water supply channel 83 side, and has a shape whose width becomes narrower in the direction in which the piston 2 is pushed. The opening 32b faces the water supply channel 86, has a trapezoidal shape when viewed from the water supply channel 86 side, and has a shape whose width becomes narrower in the direction in which the piston 2 is pushed. The outer peripheral surface of the piston 2 at the peripheral edge of the opening 22a is fitted to the inner peripheral surface of the cylinder 3 at the peripheral edge of the opening 32a. The outer peripheral surface of the piston 2 at the peripheral edge of the opening 22b is fitted to the inner peripheral surface of the cylinder 3 at the peripheral edge of the opening 32b. The openings 22a and 32a constitute a throttle portion 4a for the flow path toward the water supply channel 83. Further, the opening portions 22b and 32b constitute a flow restricting portion 4b toward the water supply channel 86. The trapezoidal shape of the opening 32a is smaller than the rectangle of the opening 22a. For this reason, the largest flow path area of the throttle part 4a is the trapezoidal area of the opening part 32a. The trapezoidal shape of the opening 32b is smaller than the rectangle of the opening 22b. For this reason, the largest flow path area of the throttle part 4b becomes the trapezoidal area of the opening part 32b.

  The throttle part 4a has the largest flow path area in a state where the openings 22a and 32a overlap each other, and the flow path area is reduced by shifting the positions of the openings. Similarly, the throttle portion 4b has the largest flow path area in a state where the openings 22b and 32b overlap each other, and the flow path area is reduced by shifting the positions of the openings. When the piston 2 is urged by the coil spring 11 and is close to the water supply channel 82 side, the apertures 4a and 4b overlap with each other, and the flow channel area becomes the largest. When the piston 2 is pushed into the cylinder 3 by the water pressure from the water supply passage 82, the positions of the openings 4a and 4b are reduced, and the flow path area is reduced. The throttle portions 4a and 4b face the water supply channels 83 and 86, respectively, and the size of the opening is smaller than the flow path cross sections of the water supply channel 83 and the water supply channel 86.

  The pressure adjustment chamber 31 has adjustment holes 31 a and 31 b penetrating inward and outward in the peripheral side portion of the cylinder 3. The adjustment hole 31a has a trapezoidal shape in which the moving direction of the piston 2 is the height direction and the width is narrowed in the direction in which the piston 2 is pushed into the cylinder 3. The adjustment hole 31 a passes through the flow path 14 formed between the housing 13 and the cylinder 3, and allows the pressure adjustment chamber 31 to communicate with the water supply paths 83 and 86 via the flow path 14. The adjustment hole 31b is a small hole, and penetrates the flow path 14 formed between the housing 13 and the cylinder 3 in the same manner as the adjustment hole 31a, and the pressure adjustment chamber 31 is connected to the water supply path 83 via the flow path 14. And 86 are communicated. The adjustment hole 31 a is closed by the peripheral side portion of the piston 2 when the piston 2 is pushed into the cylinder 3. On the other hand, the adjustment hole 31 b is provided at a position where the piston 2 is not blocked by the peripheral side portion of the piston 2 even when the piston 2 is pushed into the stop position in the cylinder 3.

  FIG. 5 is a schematic diagram for explaining a configuration of another example of the adjustment hole 31a. The adjustment holes 31 a shown in FIG. 5 are provided as a plurality of small holes along the moving direction of the piston 2, and the diameter of the small holes decreases in the direction in which the piston 2 is pushed into the cylinder 3.

  Next, the operation of the constant flow valve 1 according to the first embodiment will be described. 6 is a longitudinal sectional view showing an operating state of the constant flow valve 1, and FIG. 7 is a sectional view taken along line BB shown in FIG. In the constant flow valve 1, when the on-off valves 93 and 94 on the secondary side are closed, the water in the water supply passages 82, 83 and 86 is in a stationary state, and as shown in FIG. 2 is urged by the coil spring 11 and is stationary at a position close to the water supply channel 82 side. The constant flow valve 1 receives water pressure at the bottom 21 of the piston 2 by the water flow from the water supply passage 82 side when either one of the on-off valves 93 and 94 on the secondary side is opened, and the biasing force of the coil spring 11 is The piston 2 is pushed into the cylinder 3 against it.

  The piston 2 shown in FIGS. 6 and 7 receives a water pressure higher than the maximum rated water pressure from the water supply channel 82 side, and a step provided on the outer peripheral surface of the end portion on the water supply channel 82 side is provided on the inner peripheral surface of the cylinder 3. It is in a state where it touched the step and reached the stop position. When the piston 2 receives the maximum rated water pressure, the piston 2 moves to the stop position, the flow passage area of the throttle portion 4a is minimized, and the flow rates in the water supply passages 83 and 86 are adjusted to a predetermined value. The aperture 4b is in a closed state. The throttle unit 4a faces the water supply channel 83 side, but water also flows through the flow channel 14 to the water supply channel 86 side. For example, when the constant flow valve 1 receives a water pressure exceeding the maximum rated water pressure from the water supply channel 82 side due to a failure of the pressure reducing valve 91, for example, the flow passage area is maintained in the minimum state by the throttle portion 4a. The flow rate of water will flow through the water supply channels 83 and 86. At this time, if the on-off valve 94 is controlled to be in the open state, water can continue to flow from the rim water spouting tool 113 to the bowl surface 121 of the toilet bowl 111, and the user can be informed of the failure.

  When the on-off valve 93 or 94 is changed from the closed state to the open state and the water pressure within the rated range is received from the water supply path 82 side, the constant flow valve 1 starts from the position where the piston 2 approaches the water supply path 82 side. 3 so as to be pushed into 3. The water flowing into the constant flow valve 1 from the water supply path 82 flows from the cylindrical inside of the piston 2 to the water supply path 83 or 86 through the throttle portion 4a or 4b. Since the size of the openings of the throttle portions 4a and 4b is smaller than the channel cross sections of the water supply passage 83 and the water supply passage 86, the flow of water flowing out from each throttle portion is suppressed from becoming turbulent. Further, the water flowing into the constant flow valve 1 from the water supply passage 82 flows into the pressure adjusting chamber 31 through the small hole 21 a provided in the bottom 21 of the piston 2. The water that has flowed into the pressure adjusting chamber 31 flows out to the flow path 14 through the adjusting holes 31a and 31b.

  When the piston 2 is pushed into the cylinder 3, the adjustment hole 31a is closed by the peripheral side portion of the piston 2, so that the pressure in the pressure adjustment chamber 31 increases. The piston 2 receives the water pressure in the direction of being pushed out from the cylinder 3 due to the pressure increase in the pressure adjusting chamber 31, so that the movement is stabilized without being excessively pushed into the cylinder 3. The pressure adjustment chamber 31 suppresses vibration of the piston 2 that occurs based on the water pressure received from the water supply path 82 and the elasticity of the coil spring 11 by the water pressure applied to the bottom 21 of the piston 2. The constant flow valve 1 can stabilize the flow rate by suppressing the vibration of the piston 2.

  The adjustment hole 31 a has a trapezoidal shape in which the moving direction of the piston 2 is the height direction, and the width becomes narrower in the direction in which the piston 2 is pushed into the cylinder 3. In the pressure adjusting chamber 31, as the piston 2 is pushed, the width of the adjusting hole 31a becomes narrower, and the pressure adjustment amount per unit movement of the piston 2 becomes smaller, so that fine adjustment is possible. On the other hand, the adjustment hole 31b is provided at a position that is not blocked by the peripheral side portion of the piston 2 even when the piston 2 is pushed into the stop position in the cylinder 3, and the pressure adjustment chamber 31 passes through the small hole 21a. It is an escape hole for water to flow into.

  According to the configuration of the adjustment hole 31 a shown in FIG. 5, the adjustment hole 31 a is provided as a plurality of small holes along the moving direction of the piston 2. Thereby, when the bottom 21 of the piston 2 passes through the small hole portion, the pressure in the pressure adjusting chamber 31 changes, and when passing through between the adjacent small holes, the pressure in the pressure adjusting chamber 31 changes. It becomes constant. In the pressure adjusting chamber 31, since the pressure does not change between the small holes with respect to a large fluctuation of the water pressure applied to the piston 2, the movement of the piston 2 can be accelerated and the flow rate can be stabilized more quickly.

  The throttle portion 4 a is provided so that the openings 22 a and 32 a face the water supply channel 83. Since the water that has flowed into the piston 2 from the water supply path 82 flows out directly from the throttle portion 4a to the water supply path 83, the streamline is not complicated and the flow rate can be stabilized. Similarly, the throttle portion 4 b is provided so that the openings 22 b and 32 b face the water supply channel 83. Since the water that has flowed into the piston 2 from the water supply passage 82 flows out directly from the throttle portion 4b to the water supply passage 86, the streamline is not complicated, and the flow rate can be stabilized.

  Further, in the throttle portion 4a, the opening portion 32a has a trapezoidal shape, and the width becomes narrower in the direction in which the piston 2 is pushed into the cylinder 3. When the water pressure on the water supply path 82 side is high, the piston 2 is pushed more into the cylinder 3. The opening 32a can suppress an increase in flow rate change due to the movement of the piston 2 by making the opening 2a narrow in the direction in which the piston 2 is pushed into the cylinder 3. Similarly, in the throttle portion 4b, the opening 32b has a trapezoidal shape, and the width becomes narrower in the direction in which the piston 2 is pushed into the cylinder 3. When the water pressure on the water supply path 82 side is high, the piston 2 is pushed more into the cylinder 3. The opening 32b can suppress an increase in flow rate change due to the movement of the piston 2 by making the width narrow in the direction in which the piston 2 is pushed into the cylinder 3.

  The constant flow valve 1 can supply water to the two flow paths of the water supply paths 83 and 86 which are the secondary flow paths by providing the throttle portions 4a and 4b in the piston 2 and the cylinder 3, respectively, and the flow rate is constant. Adjust to. Since the constant flow valve 1 has a structure in which the flow path is branched by a plurality of restrictors, the constant flow valve and the branch structure are made compact compared to the structure in which the flow path is branched downstream of the constant flow valve. can do. The openings 32a and 32b of the cylinder 3 shown in FIG. 3 have substantially the same opening area. However, if the opening areas are different, the flow rate when water flows to the water supply channel 83 side and the water supply channel 86 side. The flow rate when flowing water can be changed.

Next, features of the constant flow valve 1 according to the first embodiment will be described.
The constant flow valve 1 according to the first embodiment of the present invention is configured to change the flow area in accordance with the pressure of the water supply path 82 that is the primary flow path, thereby changing the flow rates in the water supply paths 83 and 86 that are the secondary flow paths. Adjust to a constant. The piston 2 is pushed into the cylinder 3 by the pressure from the water supply passage 82. In the throttle portions 4a and 4b, the flow path area is narrowed when the piston 2 is pushed. The pressure adjusting chamber 31 is surrounded by the cylinder 3 and the bottom 21 of the piston 2, and the pressure increases when the piston 2 is pushed in. Thereby, when the piston 2 moves, the constant flow valve 1 can suppress the vibration of the piston 2 by changing the pressure in the pressure adjusting chamber 31 and can stabilize the flow rate.

  Further, the constant flow valve 1 is formed with adjustment holes 31 a and 31 b communicating with the pressure adjustment chamber 31 and the water supply passages 83 and 86 as secondary flow paths on the side surface of the cylinder 3. When the piston 2 is pushed, the constant flow valve 1 can partially block the adjustment hole 31a and change the pressure in the pressure adjustment chamber 31, thereby suppressing vibration of the piston 2 and stabilizing the flow rate. .

  In the constant flow valve 1, throttle portions 4 a and 4 b are formed by openings 22 a and 22 b provided on the peripheral side of the piston 2 and openings 32 a and 32 b provided on the peripheral side of the cylinder 3. The constant flow valve 1 can be configured compactly because the throttle portions 4 a and 4 b are formed in a part of the piston 2 and the cylinder 3.

  In the constant flow valve 1, the adjustment hole 31a has a trapezoidal shape in which the moving direction of the piston 2 is the height direction. As a result, the pressure adjustment chamber 31 can be finely adjusted because the adjustment hole 31a becomes narrower as the piston 2 is pushed in and the pressure adjustment amount per unit movement of the piston 2 becomes smaller.

  The constant flow valve 1 is provided with a plurality of adjustment holes 31a along the moving direction of the piston. Thereby, the pressure adjusting chamber 31 can speed up the movement of the piston 2 and stabilize the flow rate more quickly because the pressure does not change between the adjusting holes 31a with respect to the large fluctuation of the water pressure applied to the piston 2. Can do.

(Embodiment 2)
FIG. 8 is a longitudinal sectional view of the constant flow valve 1 according to the second embodiment, and FIG. 9 is a sectional view taken along the line CC shown in FIG. The constant flow valve 1 according to the second embodiment includes a partition wall 31 c that partitions the pressure adjustment chamber 31. The partition wall 31c has a plate shape extending in the axial direction of the cylinder 3, and partitions the pressure adjustment chamber 31 into a compartment 31d on the water supply channel 83 side and a compartment 31d on the water supply channel 86 side. Each branch 31d has adjustment holes 31a and 31b at positions facing the water supply channel 83 and the water supply channel 86. As in the first embodiment, the adjustment hole 31 a has a trapezoidal shape in which the moving direction of the piston 2 is the height direction and the width is narrowed in the direction in which the piston 2 is pushed into the cylinder 3. The adjustment hole 31 a is closed by the peripheral side portion of the piston 2 when the piston 2 is pushed into the cylinder 3. The adjustment hole 31b is a small hole and is provided at a position where the piston 2 is not blocked by the peripheral side portion of the piston 2 even when the piston 2 is pushed into the cylinder 3 to the stop position.

  The bottom portion 21 of the piston 2 is divided into two so as to be fitted into the respective compartments 31d of the pressure adjusting chamber 31, and a small hole 21a is provided in each divided bottom portion 21. The bottom portion 21 of the piston 2 has a partition wall 21c that extends in the axial direction toward the inside of the piston 2. The partition wall 21c has a slit formed in a concave shape into which the partition wall 31c of the pressure adjusting chamber 31 is inserted. The partition wall 21c extends to the edge on the water supply path 82 side in the openings 22a and 22b of the piston 2.

  Next, the operation of the constant flow valve 1 according to the second embodiment will be described. 10 is a longitudinal sectional view showing an operating state of the constant flow valve 1, and FIG. 11 is a sectional view taken along the line DD shown in FIG. In the constant flow valve 1, when the on-off valves 93 and 94 on the secondary side are closed, the water in the water supply passages 82, 83, and 86 is stationary, and as shown in FIG. 2 is urged by the coil spring 11 and is stationary at a position close to the water supply channel 82 side. The constant flow valve 1 receives water pressure at the bottom 21 of the piston 2 by the water flow from the water supply passage 82 side when either one of the on-off valves 93 and 94 on the secondary side is opened, and the biasing force of the coil spring 11 is The piston 2 is pushed into the cylinder 3 against it.

  The piston 2 shown in FIGS. 10 and 11 receives a water pressure equal to or higher than the maximum rated water pressure from the water supply channel 82 side, and a step provided on the outer peripheral surface of the end portion on the water supply channel 82 side is provided on the inner peripheral surface of the cylinder 3. It is in a state where it touched the step and reached the stop position. When the piston 2 receives the maximum rated water pressure, the piston 2 moves to the stop position, the flow passage area of the throttle portion 4a is minimized, and the flow rates in the water supply passages 83 and 86 are adjusted to a predetermined value. The aperture 4b is in a closed state. The throttle unit 4a faces the water supply channel 83 side, but water also flows through the flow channel 14 to the water supply channel 86 side. For example, when the constant flow valve 1 receives a water pressure exceeding the maximum rated water pressure from the water supply channel 82 side due to a failure of the pressure reducing valve 91, for example, the flow passage area is maintained in the minimum state by the throttle portion 4a. The flow rate of water will flow through the water supply channels 83 and 86. At this time, if the on-off valve 94 is controlled to be in the open state, water can continue to flow from the rim water spouting tool 113 to the bowl surface 121 of the toilet bowl 111, and the user can be informed of the failure.

  When the on-off valve 93 or 94 is changed from the closed state to the open state and the water pressure within the rated range is received from the water supply path 82 side, the constant flow valve 1 starts from the position where the piston 2 approaches the water supply path 82 side. 3 so as to be pushed into 3. The water flowing into the constant flow valve 1 from the water supply path 82 flows from the cylindrical inside of the piston 2 to the water supply path 83 or 86 through the throttle portion 4a or 4b. Since the size of the openings of the throttle portions 4a and 4b is smaller than the channel cross sections of the water supply passage 83 and the water supply passage 86, the flow of water flowing out from each throttle portion is suppressed from becoming turbulent. Further, the water flowing into the constant flow valve 1 from the water supply passage 82 flows into the pressure adjusting chamber 31 through the small hole 21 a provided in the bottom 21 of the piston 2. When water flows to the water supply channel 83 side, the water flows into the branch chamber 31d on the water supply channel 83 side through the small hole 21a on the water supply channel 83 side, passes through the adjustment holes 31a and 31b on the water supply channel 83 side, It flows out to the water supply channel 83. Further, when water flows to the water supply channel 86 side, the water flows through the small hole 21a on the water supply channel 86 side into the compartment 31d on the water supply channel 86 side, and passes through the adjustment holes 31a and 31b on the water supply channel 86 side. And flows out to the water supply channel 86.

  When the piston 2 is pushed into the cylinder 3, the adjustment hole 31a is closed by the peripheral side portion of the piston 2, so that the pressure in the pressure adjustment chamber 31 increases. The piston 2 receives the water pressure in the direction of being pushed out from the cylinder 3 due to the pressure increase in the pressure adjusting chamber 31, so that the movement is stabilized without being excessively pushed into the cylinder 3. The pressure adjustment chamber 31 suppresses vibration of the piston 2 that occurs based on the water pressure received from the water supply path 82 and the elasticity of the coil spring 11 by the water pressure applied to the bottom 21 of the piston 2. The constant flow valve 1 can stabilize the flow rate by suppressing the vibration of the piston 2.

  The constant flow valve 1 is independent of the flow rate in the water supply channel 83 and the water supply channel 86 by making the adjustment hole 31a provided on the water supply channel 83 side and the adjustment hole 31a provided on the water supply channel 86 side have different shapes and sizes. Control can be performed. The constant flow valve 1 can change the amount of change in the flow rate by changing the flow rate or the moving speed of the piston 2 in the water supply channel 83 and the water supply channel 86. For example, the adjustment hole 31a can be trapezoidal, and the width and height can be different. Further, as shown in FIG. 5, the adjustment hole 31a may have a configuration in which a plurality of small holes are provided along the moving direction of the piston 2, and the number, size, interval, and the like of the small holes may be different.

  The constant flow valve 1 can supply water to the two flow paths of the water supply paths 83 and 86 which are the secondary flow paths by providing the throttle portions 4a and 4b in the piston 2 and the cylinder 3, respectively, and the flow rate is constant. Adjust to. Since the constant flow valve 1 has a structure in which the flow path is branched by a plurality of restrictors, the constant flow valve and the branch structure are made compact compared to the structure in which the flow path is branched downstream of the constant flow valve. can do. The openings 32a and 32b of the cylinder 3 shown in FIG. 8 have substantially the same opening area. However, if the opening areas are different, the flow rate when water flows to the water supply channel 83 side and the water supply channel 86 side. The flow rate when flowing water can be changed.

Next, features of the constant flow valve 1 according to the second embodiment will be described.
The constant flow valve 1 according to the second embodiment of the present invention includes a partition wall 31 c that partitions the pressure regulation chamber 31. In the pressure adjustment chamber 31, adjustment holes 31a and 31b are formed in each of the compartments 31d, which are portions partitioned by the partition wall 31c. Each compartment 31d of the pressure regulation chamber 31 communicates with water supply passages 83 and 86, which are different secondary flow paths, through regulation holes 31a and 31b. The constant flow valve 1 can perform independent control on the flow rates in the water supply path 83 and the water supply path 86 by making the adjustment holes 31a and 31b have different shapes and sizes.

  In the above, it demonstrated based on embodiment of this invention. Those skilled in the art will appreciate that these embodiments are illustrative, and that various modifications and changes are possible within the scope of the present invention, and that such modifications and changes are also within the scope of the present invention. It is a place. Accordingly, the description and drawings herein are to be regarded as illustrative rather than restrictive.

1 constant flow valve, 2 piston, 22a, 22b opening, 3 cylinder,
31 pressure adjusting chamber, 31a, 31b adjusting hole, 31c partition wall,
32a, 32b opening, 4a, 4b throttle part, 82 water supply channel (primary side channel),
83, 86 Water supply channel (secondary channel).

Claims (6)

In a constant flow valve that adjusts the flow rate in the secondary side flow path to be constant by changing the flow path area according to the pressure of the primary flow path,
A cylinder,
A piston that is pushed into the cylinder by pressure from the primary flow path;
A throttle portion in which the flow path area is narrowed by the piston being pushed in;
A pressure regulating chamber that is surrounded by the cylinder and the piston, and whose pressure is increased when the piston is pushed in;
A constant flow valve characterized by comprising: An adjustment hole for communicating the pressure adjustment chamber and the secondary side flow path is formed on the side surface of the cylinder,
The constant flow valve according to claim 1, wherein the adjustment hole is partially blocked by the piston being pushed in.   3. The constant flow valve according to claim 2, wherein the throttle portion is formed by an opening provided in a peripheral side portion of the piston and an opening provided in a peripheral side portion of the cylinder.   The constant flow valve according to claim 2 or 3, wherein the adjustment hole has a trapezoidal shape in which a moving direction of the piston is a height direction.   The constant flow valve according to claim 2 or 3, wherein a plurality of the adjustment holes are provided along a moving direction of the piston. A partition wall for partitioning the pressure regulating chamber;
6. The pressure adjusting chamber is characterized in that the adjusting hole is formed in each part partitioned by the partition wall and communicates with a different secondary side flow path depending on the adjusting hole. The constant flow valve according to any one of the above.

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