JPH0454381Y2 - - Google Patents

Description

[Detailed description of the invention] This invention combines a vacuum breaker valve with a check valve that prevents water from the secondary side from flowing back into the primary side.
This invention relates to an improvement in an atmospheric pressure type vacuum breaker that opens the secondary side to the atmosphere when the check valve is closed.

Atmospheric pressure type vacuum breaker A of the above form
is usually constructed as shown in Figure 1.

That is, the piping 1 on the primary side w that communicates with the water main, and the secondary side y that communicates with the water supply port such as a faucet.
The valve box 3 provided to connect and communicate with the piping 2 has a communication port 30 that communicates with the piping 1 on the primary side w, and a communication port 31 that communicates with the piping 2 on the secondary side y. Opening port 3 that opens to the atmosphere in addition to the
Set 2. In the valve box 3, a check valve a facing a valve seat 34 provided around a communication port 30 communicating with the piping 1 on the primary side w is mounted on a fulcrum shaft 3.
The valve opening operation is supported by the rotating end of an arm 41 that rotates up and down about zero center, and moves up and down with respect to the valve seat 34 by rotation of the arm 41 to open the communication port 30. The valve is installed to close the valve 30. Furthermore, the open valve b facing the valve seat 35 provided around the open port 32 is integrally continuous with the arm 41 of the check valve a rotating about the fulcrum shaft 40, and is symmetrical to the arm 41. The rotary end of the arm 42 extending to the side is supported so as to be raised and lowered relative to the valve seat 35 by vertical rotation about the fulcrum shaft 40 of the arm 42,
The valve opening operation for opening the opening 32 and the closing operation for closing the opening 32 are performed by rotation of the arm 42. And this release valve b
By increasing the weight of the arm 42 or by providing a weight 43 on the arm 42, the arm 42 can be rotated downward to open the open valve b and close the check valve a, which is the normal state. When water flows due to the opening operation of a manual valve or solenoid valve installed in piping 1 on the primary side w, check valve a opens due to the flow resistance, and at the same time, open valve b closes. It is configured to do so.

This atmospheric pressure type vacuum breaker A was previously used in combination with flush valves of flush toilets, etc., and when the water flow from the primary side w was cut off, the With the operation of release valve b, which opens as shown in FIG. Even if negative pressure is generated, it completely prevents the suction of wastewater on the secondary side y, but this is because the water on the secondary side y is sucked into the open valve b, like in a flush toilet. Only when the valve is assumed to fall downward when the valve is opened, problems arise when it is installed in a closed circuit as illustrated below.

In FIG. 2, a reheating circuit 50 including a reheating heat exchanger h2, a circulation pump P, and a flow switch SW is connected to the bathtub B, and further,
The circuit 50 is connected to a pipe 2 that communicates with the communication port 31 on the secondary side y of the atmospheric pressure vacuum breaker A.
It is connected via a check valve V, and the communication port 30 is connected to the primary side w of the atmospheric pressure type vacuum breaker A to a circuit 51 for hot water supply comprising a heat exchanger h1 for hot water supply and a water flow sensor S. Connect piping 1 to the solenoid valve
A hot water supply circuit for bathtub B is connected via SV, and the hot water supply circuit for bathtub B is controlled to a constant water level by a water flow sensor S, and the hot water poured into bathtub B can be reheated. It shows.

In such a case, in Figure 2, the solenoid valve
If the atmospheric pressure type vacuum breaker A shown in Fig. 1 above is installed between the SV and the check valve V, the hot water supply circuit 5 connected to the piping 1 on the primary side w
Even if negative pressure occurs on the side of bathtub B, the hot water in bathtub B, which belongs to dirty water, should be prevented from flowing back into the water main via the reheating circuit 50.
In reality, since the reheating circuit 50 is a sealed circuit connected to the bathtub B, even if the release valve b of the atmospheric pressure vacuum breaker A is opened, water on the secondary side y will fall. This does not happen, and the effect of this atmospheric pressure type vacuum breaker A cannot be expected. Moreover, if bathtub B is installed in a high place such as the second floor of a building and occupies a higher position than atmospheric pressure vacuum breaker A, its check valve a is closed. In this situation, the hot water in the bathtub B applies reverse water pressure from the secondary side to the check valve V installed in the piping 2 on the secondary side.
The hot water in the bathtub B will be pushed up into the valve box 3, so even if the release valve b is opened, the secondary side will not reach the level shown in the chain line A in FIG. If there is water in the bathtub B, and if dirt gets stuck in the check valve a and its function is incomplete, even if there is a slight negative pressure on the primary side, the hot water in the bathtub B will flow to the water mains. It begins to flow backwards to the side.

The present invention was devised in order to solve the problems that occur when the atmospheric pressure type vacuum breaker A is installed in a closed circuit. Even if used when connecting to the primary side w, when the flow from the primary side w stops and the check valve a closes and the release valve b opens,
By ensuring that there is an air layer communicating with the atmosphere below the check valve a, backflow of sewage from the secondary side y when negative pressure occurs on the primary side w is reliably prevented. The purpose is to provide new means to enable

In the present invention, as a means to achieve this objective, a communication port communicating with the primary side piping, a communication port communicating with the secondary side piping, and an open port open to the atmosphere are provided. Inside the valve box,
A check valve that opens and closes the valve by moving up and down relative to the valve seat provided in the communication port, and a check valve that opens and closes the valve by moving up and down relative to the valve seat provided in the opening port. The valves are supported through arms that rotate symmetrically about a fulcrum axis, and are installed so that when one valve opens, the other valve closes, and the open valve opens under normal conditions due to the weight difference, creating a check valve. The valve seat facing the check valve is formed at a higher position than the valve seat facing the open valve, and the open port is positioned below the check valve that abuts the valve seat. This invention proposes an atmospheric pressure type vacuum breaker characterized by being equipped with a cylindrical part that rises higher than the opening surface.

Next, embodiments will be described in detail with reference to the drawings. Note that the same reference numerals in the drawings are used for constituent members having the same effect as those of the previous means.

FIG. 3 is a longitudinal side view of an atmospheric pressure type vacuum breaker A in which the present invention can be implemented. In the figure, 1 is piping on the primary side w, 2 is piping on the secondary side y,
3 is the valve box of atmospheric pressure type vacuum breaker A, 3
A indicates a cylindrical portion provided in the valve box 3, a indicates a check valve, and b indicates a release valve.

In this example, the piping 1 on the primary side w is the fourth
As shown in the figure, a circuit 51 for hot water supply comprising a heat exchanger h1 for hot water supply, a water flow sensor S, etc.
The piping 2 on the secondary side y is connected to the reheating heat exchanger h2 and the circulation pump P as shown in Fig. 4 above.
A reheating circuit 5 that is equipped with a flow switch SW, etc., and reheats the hot water in the bathtub B.
0 through a check valve V.

The valve box 3 of the atmospheric pressure vacuum breaker A is
As shown in FIG. 3, the communication port 30 of the primary side w is provided on the upper end side and serves as a connection part for connecting to the piping 1 of the primary side w, and the communication port 30 is provided on the lower end side. A communication port 31 of the secondary side y, which serves as a connection part for connecting to the piping 2 of the secondary side y, is provided at a position vertically symmetrical to the above, and the communication port 30 leads to the communication port 31. An open port 32 is opened on the upper surface side at a position laterally away from the water passage, and an annular valve seat 35 is provided around the lower end side of the open port 32 facing the open valve b. There is no difference from the conventional one in that an annular valve seat 34 facing the check valve a is provided around the communication port 30. However, the annular valve seat 34 facing the check valve a around the communication port 30 on the primary side w is
It is formed to occupy a position higher than the valve seat 35 facing the open valve b by a height H, and
A portion of the passageway extending from the communication port 30 to the communication port 31 that faces the height H is formed into a cylindrical portion 3a rising upward from the level of the open port 32.

The check valve a is formed into a disk shape that abuts and closes an annular valve seat 34 provided on the upper end side of the cylindrical portion 3a, and abuts against the valve seat 34 from the secondary side y. An arm that is supported on the upper end of a vertically long valve shaft 37 and whose lower end rotates vertically around a fulcrum shaft 40 provided inside the valve box 3. By supporting the rotating end of the arm 41, the arm 41 moves up and down in the cylindrical part 3a, and comes into contact with the valve seat 34 to close the valve seat 34. The valve is moved downward away from the valve seat 34 to open the valve seat 34, thereby performing a valve closing operation.

Further, the release valve b is formed in a disc shape corresponding to the annular valve seat 35 provided in the opening port 32, and is opposed to the valve seat 35 from the inner cavity side of the valve box 3.
The short valve shaft 38 is supported by the rotating end of an arm 42 provided inside the valve box 3 so as to be able to rotate up and down in symmetry with the arm 41 about the aforementioned fulcrum shaft 40. 42 performs a valve opening operation in which the opening port 32 is opened by moving away from the valve seat 35, and a valve closing operation in which the opening port 32 is closed by contacting the valve seat 35, and during this operation, At the same time, the arm 41 supporting the check valve a is symmetrically moved up and down so that when the open valve b closes, the check valve a opens, and when the valve closes, the check valve a closes. It is set as. This release valve b can be made heavier by increasing its own weight or by providing a weight on the arm 42.
In the normal state, the check valve a is lowered to the open position, thereby pushing the check valve a up to the closed position.

Further, in the mouth wall 32a surrounding the opening port 32 provided with the release valve b, a drain port 52 that opens to the outside is opened at a part of the mouth wall 32a that is as close to the bottom as possible on the upper surface side of the valve seat 35. The drain port 52 is equipped with a nipple 54 for connecting a pipe 53 for guiding drainage. Further, a net-shaped cap 55 is fitted on the upper end side of the mouth wall 32a surrounding the opening 32.

The embodiment device constructed in this manner operates as follows.

If the solenoid valve SV connecting the piping 1 on the primary side w and the hot water supply circuit 51 is disconnected and the flow of water in the valve box 3 stops, the check valve a receives the water. When the flow resistance disappears, the check valve a is pushed up to the closed position by the downward movement due to the weight of the open valve b, and at the same time, the open valve b is lowered to the open position, resulting in the normal state shown in FIG.

In this state, there is a water level difference of height H between the water in the cylindrical part 3a of the valve box 3 and the level of the valve seat 35, which is opened by the opening operation of the release valve b.
The water in the valve box 3 is pushed up to the outside through the open port 32 opened to the atmosphere by this water level difference.
The pushed up water begins to overflow to the outside from the drain port 52. At the same time, external air is replaced by overflowing water from the widely open mouth edge of the valve seat 35 and is sucked into the cylindrical portion 3a. At the upper part, an air layer is formed on the lower surface side of the check valve a in the closed position.

Therefore, the water on the primary side w above check valve a and the water on the secondary side y below check valve a are completely separated by the air layer formed below check valve a. In particular, when negative pressure occurs on the primary side w,
Even if the solenoid valve SV and the check valve a are malfunctioning due to dirt or the like, the sewage on the secondary side y is prevented from being sucked into the primary side.

Next, FIG. 5 shows another embodiment. In this embodiment, in the above-described embodiment shown in FIG. A communication hole 36 is opened to communicate with the communication hole 3.
6 is equipped with a pressure-type vacuum breaker valve c which is opened by the negative pressure generated within the cylindrical portion 3a. Other than this point, the rest of the configuration is the same as that of the previous embodiment, so the same reference numerals will be given to the same constituent members and the detailed explanation will be omitted.

In this embodiment, when the primary side w is operated by a solenoid valve SV or a manual valve, the flow of water passing through the valve box 3 is stopped, and the check valve a is closed as shown in Fig. 5, opening the valve. When valve b is in the state of opening, the water in the cylindrical part 3a descends due to the water level difference H, so that the cylindrical part 3a
When negative pressure is generated inside, the pressure-type vacuum breaker valve c is opened, and outside air is sucked directly into the cylindrical portion 3a through the communication hole 36 provided in the upper part of the cylindrical wall of the cylindrical portion 3a. It acts in such a way that it is

Therefore, the water in the cylindrical part 3a pushes out the water in the valve box 3 through the opening 32 due to the water level difference H and descends, thereby replacing outside air and flowing into the cylindrical part 3a. As a result, an operation of forming an air layer corresponding to the water level difference H within the cylindrical portion 3a is quickly performed.

As explained above, the atmospheric pressure type vacuum breaker according to the present invention has the communication port 30 communicating with the piping 1 on the primary side w and the communication port 31 communicating with the piping 2 on the secondary side y open to the atmosphere. Opening port 32
A check valve a that opens and closes the valve by moving up and down relative to the valve seat 34 provided in the communication port 30, and a valve seat 35 provided in the opening port 32 are disposed in the valve box 3.
The open valve b, which opens and closes by lifting up and down against the valve, is supported via arms 41 and 42 that rotate symmetrically about a fulcrum shaft 40, so that when one valve opens, the other closes. At the same time, due to the difference in weight, the open valve b is normally opened and the check valve a is closed. This is because the cylindrical portion 3a rising higher than the opening surface of the opening port 32 is installed below the check valve a which is formed at a position higher than the seat 35 and abuts against the valve seat 34. , even when the secondary side y is connected to a closed circuit or a bathtub located at a high place, when the flow from the primary side w stops, check valve a closes, and release valve b opens. , an air layer communicating with the atmosphere is definitely present below the check valve a, and the water on the primary side w and the waste water on the secondary side y are completely separated via this air layer. This makes it possible to reliably prevent sewage from flowing back from the secondary side y when negative pressure is generated on the primary side w.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view of a conventional atmospheric pressure type vacuum breaker, Fig. 2 is an explanatory diagram when the same as above is used in a closed circuit, and Fig. 3 is a longitudinal side view of an atmospheric pressure type vacuum breaker according to the present invention. , FIG. 4 is an explanatory diagram of a state in which it is incorporated into the same sealed circuit, and FIG. 5 is a longitudinal sectional side view of another embodiment of the same. Explanation of drawing symbols, A... Atmospheric vacuum breaker, B... Bathtub, a... Check valve, b... Release valve, c... Vacuum breaker valve, h1... Heat exchanger for hot water supply, h2...Heat exchanger for reheating, w...Primary side, y...Secondary side, P...Circulation pump, S...Water flow sensor, V...Check valve, SV...Solenoid valve, SW
...Flow switch, H...Height, 1...Piping,
2...Piping, 3...Valve box, 3a...Cylindrical part, 3
0, 31...Communication port, 32...Opening port, 32a...
... Mouth wall, 34, 35 ... Valve seat, 36 ... Communication hole,
37, 38... Valve shaft, 40... Fulcrum shaft, 41, 4
2...Arm, 43...Weight, 5...Benture pipe, 50...Circuit for reheating, 51...Circuit for hot water supply, 52...Drain port, 53...Pipe,
54...nipple, 55...cap, 60...
Pipe wall, 61...intake hole, 62...drainage pipe.

Claims (1)

[Scope of claim for utility model registration] Communication port 30 communicating with piping 1 on primary side w
and a communication port 31 that communicates with the piping 2 on the secondary side y.
and a check valve a that opens and closes the valve by moving up and down relative to a valve seat 34 provided in the communication port 30, and a An open valve b that opens and closes by moving up and down relative to a valve seat 35 provided at an open port 32 is supported via arms 41 and 42 that rotate symmetrically about a fulcrum shaft 40, It is installed so that when one valve opens, the other valve closes, and the difference in weight regulates the open valve b to open and the check valve a to close under normal conditions, and a valve seat facing the check valve a. 34 is the valve seat 35 facing the release valve b.
An atmospheric pressure valve characterized in that a cylindrical part 3a rising higher than the opening surface of the opening 32 is installed below the check valve a which is formed at a higher position and abuts against the valve seat 34. Yum breaker. A communication hole 36 that communicates with the atmosphere is provided in a portion of the cylindrical portion 3a near the top of the cylindrical wall, and the communication hole 3
6. The atmospheric pressure type vacuum breaker according to claim 6, further comprising a vacuum breaker valve c which is opened by negative pressure generated within the cylindrical portion 3a. The atmospheric pressure type vacuum breaker according to claim 1, wherein a drain port 52 is provided at a portion of the mouth wall 32a of the opening port 32 located above the valve seat 35.