JP2012180711A - Intake valve device equipped with freezing damage prevention function - Google Patents

Abstract

[PROBLEMS] To provide an intake valve device that allows air to be introduced from the outside into a water pipe or water appliance while draining with an antifreeze stopper while preventing damage due to volume expansion during freezing of the water pipe or water appliance. To do.
An intake valve unit body in which a valve body of an intake port normally closed by a valve spring is incorporated in the valve body, and the intake valve unit body is urged and supported on the intake outlet side by a load spring in the valve body housing chamber. The pressure absorbing case is formed with a buffer chamber on the intake inlet side and can be attached to a water pipe or a water appliance by a male screw on the intake outlet side.
[Selection] Figure 1

Description

In the present invention, when water in a pipe (hereinafter referred to as “water pipe”) including a water pipe or a water appliance freezes, the water pipe can be prevented from being damaged due to the volume expansion of the water. The present invention relates to an intake valve device having an intake function that can introduce air into a water pipe from outside during water drainage work using a freezer.

Until now, when water in a water pipe is exposed to a low temperature environment for a long time, the water itself begins to freeze, and the water pressure in the water pipe rises due to volume expansion based on freezing that occurs at that time. There were still problems with causing rupture of pipes and damage to water supply equipment.

In order to prevent such a freezing damage accident, there are a method of keeping an electric heater around a water pipe, a method of keeping warm, and a method of keeping a small amount of water flowing. However, both included problems such as the cost of electricity and water.

In order to solve the above problems, as a method that does not incur the running costs of electricity bills and water bills, install an antifreeze water faucet (for example, Utility Model Registration No. 2513962) on the upstream side of the water pipe, and if you are concerned about freezing, There is a method of operating this antifreeze water hydrant in advance and discharging the water in the water pipe into the ground or a drain through the antifreeze water hydrant, thereby preventing a freezing accident. However, this method is based on the premise that the work is predicted in advance of freezing, and there is no problem if it is possible to predict the freezing in advance. In the case of unexpected cold waves during the seasons, etc., there were many accidents caused by freezing.
In addition, in relation to the expression of “antifreeze hydrant” in the above, the Japan Valve Industry Association standard “JV10” (established on March 17, 1998) includes the above-mentioned antifreeze hydrant “used in cold regions” The term “valve with a structure to prevent freezing by discharging the water in the water supply pipe into the ground by installing it in the middle of the water supply pipeline” is defined as “antifreeze plug”. In the present invention, it is expressed as “antifreeze plug”.

In order to solve the above problems, the running pressure of electricity and water bills is not incurred, and as a method of preventing freezing damage that can cope with unexpected cold waves, the internal pressure in water pipes rising due to volume expansion at the beginning of freezing is reduced. Proposed a method to prevent freezing damage by using the water pressure to move the valve body to open the inside of the water pipe and the outside of the water pipe, thereby discharging water through the hole to the outside of the water pipe (See Patent Document 1: Japanese Patent Laid-Open No. 2008-88658).
Also, using the internal pressure in the water pipe that rises due to volume expansion at the beginning of freezing and moving the valve with that water pressure ensures a space to absorb the internal pressure, so that water is not discharged outside the water pipe. A method for preventing freezing damage has also been proposed (see Patent Document 2: Japanese Utility Model Publication No. 54-122117).

In the above-mentioned Patent Document 1, water is discharged to the outside of the water pipe every time freezing occurs. For this reason, extra equipment such as a hopper for receiving the discharged water is necessary so that the surrounding area will not be submerged, which is expensive, and even if water is discharged from the hole to the outside, it remains around the hole. When the water droplets remained attached, the ice grew rapidly, eventually closing the hole with ice, and water could not be discharged, leaving the possibility of impairing the intended function.

In addition, as described in Patent Document 2, cases of breakage due to freezing tend to occur mainly in bent parts of pipes and faucets, that is, in areas where internal pressure resistance is weak. An example is shown in which the device is also mounted in the vicinity thereof. In the case of this patent document 2, there is no problem like patent document 1, but the problem of the place where it is attached is mentioned.

On the other hand, various devices for assisting the water draining operation using the above-described antifreeze plugs are attached to the water supply piping in cold regions. Of these, it is also common practice to install an intake valve together with an antifreeze. As an example thereof, for example, utility model registration No. 2515155 is mentioned as the intake valve described above. According to this intake valve, the valve provided inside the intake valve device is automatically generated by the negative pressure in the water pipe generated during the drainage operation, even when the drainage by the antifreeze plug is not opened. Thus, the valve can be opened and air can be introduced into the water pipe from the outside of the water pipe, and the water in the pipe can be smoothly discharged to the outside of the water pipe through the antifreeze plug.
However, in this case as well, the attachment position of the intake valve may be separately attached to the bent portion of the pipe as in the anti-freezing device of Patent Document 2, and both the intake valve and the anti-freezing damage prevention device may be attached. Each individual work to construct is required. Therefore, since it has problems such as securing the installation location and increasing the number of construction steps, it is difficult to adopt Patent Document 2.

JP 2008-88658 A No. 54-122117

In order to solve the above-mentioned problems, the present invention predicts that it is not usually necessary without draining work with an antifreeze stopper, and when it is not performed or when the draining work is forgotten, a cold wave unexpectedly occurs. Even if it occurs, it can absorb the volume expansion due to freezing of the water pipe, prevent damage to it, and introduce water from the outside of the water pipe into the water pipe at the time of draining work with the antifreeze tap An object of the present invention is to provide an intake valve device having a function of preventing freezing breakage, which can smoothly perform water draining work.

(Claim 1)
The first aspect of the present invention is an intake valve that is normally closed by a valve spring and automatically opens due to negative pressure in the pipe when draining water, and comprises the following (A) and (B). A slidable intake valve device in a pressure absorbing case with a buffer chamber having a function of preventing freezing damage.
(A) The intake valve includes a valve body including a housing having an intake port and a valve seat, and a spring holding lid with a hole having an outflow hole, and a valve spring on the valve seat on the intake port side in the valve body. A valve body that is normally closed and accommodated, and a seal packing is attached to the outer periphery of the valve body, and the integrated intake valve unit body (B) includes a suction inlet, a valve body accommodation chamber, The intake valve unit body housed in the pressure absorbing case is supported on the intake outlet side urged by a load spring, and the intake port and the outflow hole of the intake valve unit body absorb pressure. A buffer chamber is formed on the intake inlet side at a position where it can communicate with the intake inlet and intake outlet of the case, and the intake valve unit body is opposed to the load spring by the buffer chamber on the intake inlet side. Can be slid toward the Comprising an external thread on the intake guide outlet side outer surface of the yield case, thereby providing a pressure-absorbing case was attachable to a water pipe or tap instrument while slidably accommodating the intake valve unit body therein.

(Claim 2)
In the present invention, the intake valve unit body housed in a pressure absorbing case is
(1) During normal water supply, the intake valve unit body that is closed by the valve spring in the valve body is urged toward the intake outlet side of the pressure absorption case by the load spring in the pressure absorption case. Held in one position,
(2) When negative pressure is generated due to drainage of tap water in the pipe, the intake valve unit body opens the valve body in the valve body against the valve spring while being held in the first position. Enabling the intake of air into the piping,
(3) When excessive pressure in the pipe is generated due to freezing of tap water in the pipe, the intake spring unit body that is still closed by the valve spring in the valve body is resisted by the load spring in the buffer chamber of the pressure absorption case. An intake valve device having a function of preventing freezing breakage, which is capable of taking the second position to move to the intake inlet side and absorb the excessive pressure, is provided.

(Claim 3), (Claim 4)
Furthermore, the present invention provides the intake valve unit body,
(A) The valve comprising a housing having an air inlet provided with a valve seat and a spring holding lid with a hole provided with an outflow hole, wherein the spring holding lid with the hole is fitted and integrated on the outflow side of the housing. The body,
(B) a valve body disposed in the valve body and opening and closing the valve seat of the intake port; and (c) a valve spring that urges the valve body to close the valve seat of the intake port. An intake valve device having a function of preventing freezing breakage is provided.
In the intake valve unit body according to the present invention, (1) the valve body that opens and closes the valve seat of the intake port is a lift valve having a valve shaft, and (2) the spring holding lid body with a hole includes In addition to the outflow hole, the valve guide has a shaft guide hole for guiding the valve shaft and further includes a spring seat, and (3) the valve spring is mounted around the valve shaft via the spring seat. Provided is an intake valve device having a function of preventing freezing damage.

(Claim 5), (Claim 6)
The present invention further includes: (1) the pressure absorbing case includes an outer case including a spring retainer and a housing cylinder that are screwed together, and (2) the spring retainer includes a small-diameter intake inlet and a spring receiving step. (3) The housing cylinder has a step portion for supporting the intake valve unit body urged by the load spring on the intake outlet side, and the spring holder is screwed and supported in the intake inlet side. An intake valve device having a function of preventing freezing breakage in which a buffer chamber is formed is provided.
In addition, the present invention also provides an intake valve device having a freeze breakage prevention function in which a spring guide is interposed in a load spring that biases an intake valve unit body in a pressure absorbing case.

According to the present invention, the intake valve itself is composed of a valve body having an intake port and an outflow hole, and a normally closed valve body biased by a valve spring housed in the valve body with the intake port closed. It is unitized as a unit body, and has a double housing structure in which the intake valve unit body is slidably accommodated while being sealed by energizing a load spring in a pressure absorbing case, and has an intake function and excess pressure. An intake valve device that is compactly integrated as one device having both absorption and relaxation functions can be provided.
As a result, even though the structure is simple, even if the water in the water pipe expands due to freezing, the intake valve unit body in the device moves to secure the volume to absorb the volume expansion. In addition to preventing damage to water pipes as well as water pipes, air can be smoothly drained by introducing air from outside the water pipe into the water pipe when draining with an antifreeze tap. Is possible.

Therefore, in the present invention, there is no running cost as in the case of the conventional method in which heat is kept by an electric heater or a small amount of water is kept flowing. This saves money.
In addition, in order to prevent freezing breakage, it does not have a structure for discharging water in the water pipe as described above, so a hopper for receiving discharged water is provided as in the conventional method of discharging water to the outside of the water pipe. There is no need for extra equipment such as, and if water droplets discharged from the discharge port remain attached, the ice grows steadily, eventually clogging the discharge port with ice and water can not be discharged Nor.
As described above, since the intake valve device as a single structure according to the present invention has a function for preventing freezing breakage and also has an intake function, the freezing breakage preventing device and the intake valve as in the prior art are used. It is possible to reduce the number of construction man-hours without having to separately provide the above-mentioned apparatus and carrying out individual construction for that purpose, and without worrying about securing the installation location of both the individual apparatuses. Further, by adopting a structure in which the freeze breakage prevention device and the intake valve of the present invention are integrated, the device of the present invention can be installed in either a vertical state or a horizontal state except for a downward installation. It is possible.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 4 shows a water pipe diagram in which the intake valve device A of the present invention is constructed. In FIG. 4, the antifreezing plug B, the intake valve device A, and the currant C are constructed and arranged in the order of the water pipe D from the upstream side toward the downstream side. Here, the intake valve device A is installed in a vertical state with the intake port facing upward at the bent portion between the water pipes E2 and E3, and as described later, the intake function and the freeze breakage prevention function can be effective. ing.
Regarding the installation of the intake valve device A, in the case of the present invention, in addition to the installation in the vertical state described above, the intake valve device A can also be installed in the horizontal state, and similarly exhibits the intake function and the freeze damage prevention function. However, it is better to avoid the installation in the downward vertical state because water remains in the apparatus during drainage of the water pipe, and the effect of the present invention cannot be achieved if the water freezes.

FIG. 1 is a cross-sectional view of an intake valve device A of the present invention when the water supply operation is normally performed in the piping system of FIG.
Specifically, in the water supply pipe diagram of FIG. 4 in which the intake valve device A is installed in a vertical state with the intake port facing upward at the bent portion of the water supply pipe, the antifreeze plug B is operated to the normal water supply position, and is opened. The operation state of the intake valve device A when the water supply reaches the currant C is shown in cross section.
In FIG. 1, the intake valve device A is generally assembled by an intake valve unit body 10 and a pressure absorbing case 20 that houses the intake valve unit body 10 therein. Individually, the intake valve unit body 10 includes a housing 11, a valve body 12, a valve spring 13, and a spring holding lid body 14 with a hole, and the valve body 12 is formed inside a valve body including the housing 11 and the spring holding lid body 14 with a hole. Is assembled as a unit body that urges the valve spring 13 toward the intake port 11a side. On the other hand, the pressure absorbing case 20 is shown as including an outer case 23 comprising a housing cylinder 21 and a spring retainer 22, a load spring 24 and a spring guide 25, and is assembled as a pressure absorbing case for housing the intake valve unit body.
The assembly of the intake valve device A including the intake valve unit body 10 and the pressure absorbing case 20 has been described as including the spring guide 25 based on FIG. 1, but the spring guide 25 may be provided without the spring guide 25. Can be directly urged by the load spring 24, and the spring guide 25 is not essential.
However, when the spring guide 25 is additionally arranged, a spring force with less bias can be applied to the intake valve unit body 10, and the spring guide 25 is positioned as an optional additional member.

Next, the structure of the intake valve unit body 10 will be described with reference to FIG.
FIG. 2 is a cross-sectional view schematically showing two forms of the intake valve unit body 10 slidably accommodated in the intake valve device shown in FIG. 1, and (a) shows a valve body with a valve shaft. (B) shows the example of a ball valve, respectively.
The intake valve unit body 10 is represented as an intake valve unit body 10A and an intake valve unit body 10B, respectively, depending on the valve structure incorporated therein, and the intake valve unit 10 is defined as a generic name including both.
In the embodiment of the intake valve device A of FIG. 1, the intake valve unit body 10 is an intake valve unit body 10A of a valve body 12A with a valve shaft 12b (hereinafter referred to as “lift valve”) shown in FIG. Is adopted.
In FIG. 2A, an intake valve unit body 10A has a lift valve 12A with a valve shaft 12b and a valve spring 13 incorporated in order in a housing 11 having an intake port 11a and a valve seat 11b, and then an outflow hole 14a and a shaft guide. A spring holding lid 14A with a hole having a hole 14b is fitted and integrated on the outflow side of the casing 11, and the lift valve 12A is assembled to the valve seat 11b by the valve spring 13 and is assembled as an intake valve unit body 10A.
In the above-described embodiment, the spring holding lid body 14A with a hole is inserted into the shaft guide hole 14b of the valve shaft 12b of the lift valve 12A to guide the operation of the lift valve 12A.
As will be described later, when the valve incorporated in the intake valve unit body is a ball valve (intake valve unit body 10B in FIG. 2B), the hole holding spring cover body 14A may have no shaft guide hole 14b. Well, here, in order to distinguish from a spring holding lid with a hole without a shaft guide hole 14b, the spring holding lid 14A with a hole having the shaft guide hole 14b in addition to the outflow hole 14a is referred to as a “valve guide 14A”. I will write it.

Further details of the intake valve unit body 10 will be supplemented. As shown in FIGS. 2A and 2B, a seal packing 11 c is attached to the outer periphery of the housing 11. The packing 11c is a seal that seals between the two when the intake valve unit body 10 is slidably accommodated in a pressure absorbing case 20 described later. Thereby, the pressure receiving of the intake valve unit body 10 is ensured, and the sliding is further ensured. On the other hand, in the case of the lift valve structure shown in FIG. 2A, in the intake valve unit body 10A, the opposed surfaces of the lift valve 12A and the valve guide 14A that interpose the valve spring 13, the lower surface of the illustrated lift valve 12A. In addition, a concave or convex spring seat 14c can be provided on the upper surface of the valve guide 14A. Here, the concave or convex formation target member is not limited to the illustrated combination, and an arbitrary combination can be selected.
In this embodiment, the intake valve unit bodies 10A and 10B are unitized in any case regardless of the internal valve body structure (lift valve or ball valve) accommodated therein. Is easy to attach and detach, and can be assembled easily.

Next, the pressure absorbing case 20 will be described with reference to FIG. In the embodiment shown in FIG. 1, the pressure absorbing case 20 described above includes an outer case 23 including a housing cylinder 21 and a spring retainer 22, a load spring 24 and a spring guide 25, and houses the intake valve unit body 10. The accommodated cylinder 21 is further assembled with a spring guide 25 and a load spring 24 mounted in that order, and a spring retainer 22 is screwed into the female screw 21e connection port of the accommodated cylinder 21.
(Structure and assembly of outer case 23)
Regarding the individual members constituting the outer case 23 including the housing cylinder 21 and the spring retainer 22, the housing cylinder 21 includes a female screw 21e serving as a connection port therein, a valve body housing chamber 21c serving as a buffer chamber described later, and An intake outlet 21b having a step portion 21d is provided. Further, a male screw 21 f is provided on the outer periphery of the lower end of the housing cylinder 21. On the other hand, the spring retainer 22 has a spring receiving step 22b that holds the intake inlet 22a and the load spring 24, and has an external thread 22c on its outer surface. Therefore, the outer case 23 is assembled by screwing the male screw 22c of the spring retainer 22 into the connection port of the female screw 21e of the housing cylinder 21. When assembling the intake valve device A, the intake valve unit body 10 is disposed in the accommodation cylinder 21, and then the spring guide 25 and the load spring 24 are sequentially attached, and finally the spring retainer 22 is screwed onto the accommodation cylinder 21.
In the state where the intake valve unit body 10 is mounted in the valve body accommodating chamber 21c in the pressure absorbing case 20 and the intake valve device A is assembled as described above, the outer case 23 includes the intake inlet 22a and the intake outlet 21b. The intake valve unit body 10 assembled and accommodated therein is urged toward the intake outlet 21b side by the pressing of the load spring 24 by the spring receiving step 22b of the spring retainer 22. Supported in 21d.
Therefore, the intake valve device A can be screw-connected to the water supply pipe D via the male screw 21f on the outer periphery of the lower end of the housing cylinder 21 constituting the outer case 23.

(Structure of spring retainer 22)
Here, the above-described spring retainer 22 will be described in more detail. The illustrated spring retainer 22 is shown as a cap-shaped spring retainer 22 having an inner space, and the spring retainer 22 includes a spring receiving step 22b having a small-diameter intake inlet 22a above the spring retainer 22. The intake inlet 22a communicates with the intake port 11a of the intake valve unit body 10 described above, and air is discharged from the outside of the water supply pipe D into the water supply pipe D at the time of draining work using the antifreeze plug B together with the intake port 11a. It is provided for introduction.
(Structure of spring retainer 22; dimensional relationship with load spring)
The spring retainer 22 is provided with a male screw 22c on the outer periphery of the lower end thereof so that it can be screw-connected to the housing cylinder 21, a spring receiving step 22b is formed above the inner space, and the load spring 24 is Support not to escape from. In this case, the diameter of the intake inlet 22 a provided in the spring receiving step 22 b is smaller than the inner diameter of the load spring 24.
Further, the lower diameter of the inner space of the spring retainer 22 is larger than the outer diameter of the load spring 24, and is designed to have a size that allows a part of the load spring 24 to be accommodated in the inner space of the spring retainer 22. Yes.

Next, assembly of each component of the intake valve device A of the present invention will be described.
(Assembly of intake valve unit body 10A)
The assembly of the intake valve unit body 10A will be described with reference to FIGS. 1 and 2 (a). A lift valve 12A fitted with a seal packing 12c is incorporated in the housing 11 with the intake port 11a on the bottom, and then a valve spring 13 is incorporated around the valve shaft 12b of the lift valve 12A, and further, a shaft guide hole 14b of the valve guide 14A. Is inserted into the valve shaft 12b of the lift valve 12A, and the valve guide 14A is fitted and integrated with the outflow side of the housing 11 while pressing the valve spring 13. Thus, the intake valve unit body 10 </ b> A is assembled and assembled as a unit body slidable in the pressure absorbing case 20.
(Assembly in the valve housing case 20 of the intake valve unit body 10A)
Next, as shown in FIG. 1, the assembled intake valve unit body 10 </ b> A is inserted into the valve body housing chamber 21 c in the housing cylinder 21 and supported by the step portion 21 d below the valve body housing chamber 21 c. Thereafter, the spring guide 25 is mounted on the upper part of the intake valve unit body 10A, then the load spring 24 is mounted, and finally the spring retainer 22 is put on, screwed into the housing cylinder 21, and the outer case 23 is assembled, thereby The assembly of the valve device A is completed.
(Buffer room)
In the assembled intake valve device A, the intake valve unit body 10 inside thereof is constantly urged and supported by the load spring 24 toward the intake outlet 21b side in the outer case 23, and the intake body 21c in the valve body accommodating chamber 21c is inhaled upward in FIG. A space that allows retraction of the valve unit body 10 is secured. This space becomes a buffer chamber that allows the pressure absorption case 20 to move to the intake inlet 22a side and absorb the excess pressure when an excessive pressure is generated in the water pipe D at the time of unexpected or inadvertent freezing. .

(Normal water supply)
Next, the intake valve device A during normal water supply will be described with reference to FIGS.
FIG. 3A is a cross-sectional view of the intake valve device A during normal water supply. This is a state in which the antifreeze tap B shown in FIG. 4 is opened and is in a water supply use operation position, and water has spread to the intake valve device A and the currant C through the water pipes E1, E2, and E3.
In this state, the water pressure from the water pipe is also applied to the inside of the intake valve device A via the intake outlet 21 b of the pressure absorbing case 20. At that time, an upward force that slides the intake valve unit body 10 in the pressure absorbing case 20 toward the intake inlet 22a works, but the load spring 24 is set so as not to be compressed at a normal water pressure level in a general household. Therefore, the intake valve unit body 10 does not move while being held on the step portion 21d side below the outer case 23 of the pressure absorbing case 20. At this time, in the intake valve unit body 10, the seal packing 12c attached to the valve body 12 urged by the valve spring 13 remains tightly closed to the valve seat 11b, and the caran C shown in FIG. Even if the bottle is opened and water is used, this close contact state is maintained.

(Draining operation by antifreeze operation)
In the winter season, when water drainage is performed using an antifreeze in advance due to concerns about freezing of the water supply, the operation part of the antifreeze B is opened as shown in FIG. By switching from the normal water supply use operation position that has been reached to the drainage operation position, the water in the water pipe D is discharged to the outside (underground) of the water pipe D through the antifreeze B. . At that time, it is necessary to introduce external air into the pipe in order to smoothly discharge the water.
FIG. 3B is a cross-sectional view showing the operating state of the intake valve device A of the present invention during the intake function.
4 is operated to the draining operation position. Thereby, the water in the water pipe E2 to the downstream water pipe E1 and the intake valve device A is discharged into the ground through the antifreeze plug B by its own weight. During underground drainage, negative pressure is generated in the pipe, and the negative pressure causes the intake valve unit body that is supported by the stepped portion 21d in the intake valve device A as shown in FIG. The valve body 12 of 10 is compressed and lowered by the valve spring 13, and the seal packing 12 c attached to the valve body 12 is detached from the valve seat 11 b of the housing 11 and opened. Along with this, the air from the outside of the water pipe D flows into the intake port 22a of the pressure absorbing case 20, the buffer chamber, the flow hole 25a of the spring guide 25, the intake port 11a of the intake valve unit body 10, the inside, the outflow hole 14a, It is introduced into the water pipe D through the intake outlet 21 b of the pressure absorbing case 20. Therefore, the water in the pipe is smoothly discharged from the discharge port of the antifreeze plug B while water and air are exchanged in the pipe.
Further, the water in the water pipe E3 downstream from the intake valve device A is smoothly discharged from the water outlet of the Calan C by opening the Calan C. By these operations, all drainage work of the water pipe D is completed.
When the drainage of the water in the water pipe D is completed, the above-described negative pressure disappears, whereby the valve element 12 that has been opened while compressing the valve spring 13 is raised, and the seal packing 12c is again connected to the valve seat. 11b and return to the closed state of FIG.
The intake valve unit body 10 has either a water supply state in which the antifreeze plug B in FIG. 3 (a) is opened and water has reached Calan C, or a state in the water draining operation in FIG. 3 (b). Even in the state, the load spring 24 does not move while being held on the step portion 21d side below the outer case 23 of the pressure absorbing case 20.

(When freezing occurs)
Usually, the behavior of the intake valve device A when a sudden cold wave occurs in a normal use state where drainage by the antifreeze plug B is not required and the operation is not performed will be described.
FIG.3 (c) is sectional drawing which shows the operating state of the intake valve apparatus A when the unexpected cold wave generate | occur | produces in the state where the draining work by the antifreeze stopper is not made.
The closed water in the water pipe D is cooled due to a decrease in the ambient outside air temperature, the water temperature decreases, and the water begins to freeze. Due to volume expansion due to freezing in the water pipe D, the water pressure in the water pipe D begins to rise.
At this time, the intake valve unit body 10 in the pressure absorbing case 20 is in a closed state, and the water pressure in the water pipe D is received by the entire intake valve unit body 10. At that time, the water pressure in the water pipe D becomes higher than the normal water pressure, and the load spring 24 pressing the intake valve unit body 10 toward the intake outlet 21b of the pressure absorption case 20 in the pressure absorption case 20. When the force is greater than the force, the entire intake valve unit body 10 is pushed upward toward the upper buffer chamber while compressing the load spring 24 in the pressure absorbing case 20.
Since the pressure absorbing case 20 has this buffer chamber inside, the entire intake valve unit body 10 can move upward in the pressure absorbing case 20 against the load spring 24, and therefore the volume expansion component can be increased. Therefore, the water pipe D can be prevented from being damaged.
In a state in which the entire intake valve unit 10 is pushed up to the buffer chamber, when the ambient air temperature subsequently rises and the water pressure in the water pipe D decreases to the normal water pressure, the intake valve unit body 10 is again moved by the load spring 24. It will return to the state of Fig.3 (a).
In addition, the volume of the buffer chamber for absorbing the excessive pressure due to freezing is designed with a size that takes into account the volume expansion in the form of a water pipe.

As described above, regarding the intake valve unit A and the intake valve unit body 10 constituting the intake valve device A, the valve body structure inside the outer case 23 is the lift valve with valve shaft (intake valve unit body 10A) shown in FIG. However, the ball valve 12B shown in FIG. 2B can be used instead of the lift valve 12A with a valve shaft. At this time, the intake valve unit body 10 is replaced with the intake valve unit body 10B. Here, the intake valve unit body 10B has a valve body including a housing 11 and a spring holding lid body 14B with a hole. The ball valve 12B and the valve spring 13 are assembled in this order, and the spring holding lid 14B with a hole is fitted into the opening end of the housing 11 so as to be integrated into a unit. The intake valve unit body 10B incorporated as the ball valve 12B is the same as the intake valve unit body 10A, even if it is a ball valve that is not a lift valve that becomes the valve body 12A with the valve shaft 12b shown in FIG. It is effective, and a ball valve may be used instead of the lift valve with a valve shaft.

In the present embodiment, the example in which the apparatus of the present invention is installed in the water pipe D has been described as a representative, but this apparatus may be incorporated in a water supply apparatus that requires an intake function.

The intake valve device A according to the present invention has been described as being used as a countermeasure against unexpected cold waves as a function of preventing freezing breakage when freezing occurs. It is also applied when the water pressure in the piping rises due to sunlight or the heat of the ceiling rises due to extreme heat in the summer, to prevent damage to water pipes and water appliances You can also.

It is sectional drawing in the normal water supply use state which shows one Example of the intake valve apparatus of this invention. FIG. 2 is an enlarged cross-sectional view schematically showing two forms of an intake valve unit body slidably accommodated inside the intake valve device shown in FIG. 1, (a) is an embodiment of a lift valve with a valve shaft, (B) shows the example of a ball valve, respectively. FIG. 2 is an operation diagram schematically showing a sectional view of an operation state of the intake valve device shown in FIG. 1, (a) showing an operation position at the time of normal water supply use, and (b) a water draining operation by operation of an antifreeze plug. (C) shows the operating positions where the excessive pressure at the time of freezing of water pipes is absorbed and the function of preventing freezing breakage is performed. It is a water supply piping figure which shows the construction example at the time of installing the intake valve apparatus of this invention in the vertical state with the inlet port facing upwards at the top part of water supply piping.

A Intake valve device B Antifreeze plug C Callan D Water pipe E1, E2, E3 Water pipe
10, 10A, 10B Intake valve unit body 11 Housing 11a Inlet port 11b Valve seat 11c Seal packing 12 Valve body 12A Lift valve 12B Ball valve 12b Valve shaft 13 Valve spring 14 Spring holding cover 14A with hole Valve guide 14B Spring holding with hole Lid 14a Outflow hole 14b Shaft guide hole 14c Spring receiving seat 20 Pressure absorbing case 21 Housing cylinder 21b Inlet outlet 21c Valve body housing chamber 21d Step 21e Female screw 21f Male screw 22 Spring retainer 22a Inlet inlet 22b Spring receiving step 22c Male screw 23 Outer case 24 Load spring 25 Spring guide

Claims (6)

The intake valve that normally closes with a valve spring and automatically opens by the negative pressure in the pipe when draining and sucks air has the following (A) and (B): A slidable intake valve device in a pressure absorbing case with a buffer chamber.
(A) The intake valve includes a valve body including a housing having an intake port and a valve seat, and a spring holding lid with a hole having an outflow hole, and a valve spring on the valve seat on the intake port side in the valve body. Is an intake valve unit body that is integrated with a valve body that is normally closed and accommodated, and in which a seal packing is attached to the outer periphery of the valve body.
(B) The pressure absorption case has an intake inlet, a valve body housing chamber, and an intake outlet, and the intake outlet side on which the intake valve unit housed in the pressure absorption case is urged by a load spring. A buffer chamber is formed on the intake inlet side at a position where the intake port and the outflow hole of the intake valve unit body communicate with the intake inlet and the intake outlet of the pressure absorption case, respectively. The intake valve unit body can be slid toward the intake inlet side against a load spring, and has an external thread on the outer surface of the pressure absorbing case on the intake outlet side. This is a pressure absorbing case that can be attached to a water pipe or a water appliance while the unit body is slidably accommodated. The intake valve device according to claim 1,
The intake valve unit body housed in the pressure absorbing case is:
(1) During normal water supply, the intake valve unit body that is closed by the valve spring in the valve body is urged toward the intake outlet side of the pressure absorption case by the load spring in the pressure absorption case. Held in one position,
(2) When negative pressure is generated due to drainage of tap water in the pipe, the intake valve unit body opens the valve body in the valve body against the valve spring while being held in the first position. Enabling the intake of air into the piping,
(3) When excessive pressure in the pipe is generated due to freezing of tap water in the pipe, the intake spring unit body that is still closed by the valve spring in the valve body is resisted by the load spring in the buffer chamber of the pressure absorption case. An intake valve device having a function of preventing freezing breakage, wherein the second position for moving to the intake inlet side to absorb the excess pressure can be taken. The intake valve device according to claim 1 or 2,
(1) The intake valve unit body is
(A) The valve comprising a housing having an air inlet provided with a valve seat and a spring holding lid with a hole provided with an outflow hole, wherein the spring holding lid with the hole is fitted and integrated on the outflow side of the housing. The body,
(B) a valve body disposed in the valve body and opening and closing the valve seat of the intake port; and (c) a valve spring that urges the valve body to close the valve seat of the intake port. An intake valve device having a function of preventing freezing and breakage. The intake valve device according to any one of claims 1 to 3,
The intake valve unit body is:
(1) The valve body for opening and closing the valve seat of the intake port is a lift valve having a valve shaft. (2) The shaft guide hole for guiding the valve shaft in addition to the outflow hole. And a valve guide further provided with a spring seat,
(3) An intake valve device having a freeze-breakage preventing function, wherein the valve spring is mounted around the valve shaft via a spring seat. The intake valve device according to any one of claims 1 to 4,
(1) The pressure absorbing case includes an outer case composed of a spring presser and a receiving cylinder that are screwed together.
(A) One spring retainer has a small-diameter intake inlet and a spring receiving step,
(B) The other storage cylinder has a step portion for supporting the intake valve unit body biased by the load spring on the intake outlet side, and is buffered on the intake inlet side in a state where the spring retainer is screwed and supported. An intake valve device having a freeze-breakage prevention function characterized by forming a chamber. 6. The intake valve device according to claim 1, further comprising a freezing breakage prevention function characterized in that a spring guide is interposed in a load spring for spring-biasing the intake valve unit body in the pressure absorbing case. Intake valve device.

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