JP4164292B2 - Edging valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an edge cut valve that prevents backflow from a secondary water channel to a primary water channel.
[0002]
[Prior art]
Conventionally, with respect to an edge cut-off valve for preventing a back flow from a secondary water channel to a primary water channel, a drain outlet is formed by a pressure difference between a primary side pressure and a secondary side pressure as described in JP 2000-304144 A. There was an edge cut valve that opened and closed.
If the pressure on the primary side is higher than the pressure on the secondary side, the drainage port is closed and fluid flows from the primary side water channel to the secondary side water channel. When it became higher than the pressure on the primary side, the drainage port was opened to discharge the backflow water.
[0003]
[Problems to be solved by the invention]
In the conventional one, the drainage port is simply opened and the backflow water is guided to the drainage port. Therefore, the inflow port is arranged on the upper side and the drainage port is arranged on the lower side so that the backflow water can easily flow to the drainage port. The ingenuity is given. However, since the inflow port remains open, when a large amount of backflow water is generated, the backflow water may reach the inflow port and come into contact with the primary fluid.
The present invention has been completed based on the above circumstances, and provides an edge cut-off valve capable of avoiding contact with the primary fluid even when backflow from the secondary side occurs. Objective.
[0004]
[Means for Solving the Problems]
As a means for achieving the above object, the invention according to claim 1 is characterized in that in the valve body, a pressure detection is possible in which the fluid pressure of the fluid on the primary side can be detected through a water supply source upstream of the heat exchanger. A chamber, a fluid passage chamber through which the fluid passes through the downstream side of the heat exchanger, the pressure detection chamber, and the fluid passage chamber, and a pressure difference between the primary side and the secondary side is detected and the pressure difference is detected. The fluid passage chamber is provided with an inlet connected to the primary channel, an outlet connected to the secondary channel, and an outlet for discharging to the outside. In addition, the discharge port is always closed in the fluid passage chamber, but when it is detected by the diaphragm that the pressure on the secondary side is higher than the primary side, it is based on the bending action of the diaphragm. There is no outlet opening / closing means for opening the outlet. A edge cutting valve, the diaphragm has a slack portion, together with the same slack portion is movable bellofram in the axial direction, said fluid passage chamber the outlet closing means opens the discharge opening operation Is characterized in that a shut-off means for closing the fluid flow path from the primary side to the secondary side is provided.
[0005]
According to a second aspect of the present invention, in the fluid passage chamber according to the first aspect, in the fluid passage chamber, a front chamber that leads the fluid flow path to the inlet side by a partition wall, an outlet port, and a rear chamber that leads to the outlet port. The partition wall is formed with a communication port for communicating the front chamber and the rear chamber, and the discharge port opening / closing means is constituted by a valve body that also serves as the blocking means. The body is configured to reciprocate between a state in which the discharge port is closed and the communication port is opened in conjunction with a displacement of the diaphragm, and a state in which the discharge port is opened and the communication port is closed. Has characteristics.
[0006]
[Action and effect of the invention]
<Invention of Claim 1>
According to the first aspect of the present invention, when the secondary side pressure is higher than that on the primary side, a pressure difference is generated between the pressure detection chamber and the fluid passage chamber. Then, the diaphragm is bent and deformed. Based on this, the discharge port opening / closing means opens the discharge port, and the blocking means closes the fluid flow path from the primary side to the secondary side in conjunction with the opening operation. Therefore, even if a reverse flow from the secondary side occurs, it is possible to prevent a situation in which the reverse flow to the primary side is blocked by the blocking means and the secondary fluid that has flowed back contacts the primary side fluid. .
[0007]
<Invention of Claim 2>
According to the invention of claim 2, the valve body serves as both the outlet opening / closing means and the blocking means. That is, since the valve body can be switched between a state in which the discharge port is closed and a state in which the communication port is closed by the displacement of the diaphragm, it is configured to open and close the discharge port and the communication port individually by separate means. In comparison, the configuration can be simplified.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
Edge cut valve 20 concerning this embodiment is used for hot-water supply system 10 which supplies warm water to a bathtub of a bath.
As shown in FIG. 1, the hot water supply system 10 generates hot water by heating water supplied from a water supply system with a heat exchanger 11 for hot water supply, and the hot water is mixed with this hot water and water to obtain an appropriate temperature. It passes through the control device 12 and is supplied to the bathtub 15 via the electromagnetic valve 13 and the check valve 14 in this order. The flow control device 12 is for controlling the hot water supply temperature, the electromagnetic valve 13 is for controlling the hot water supply to the bathtub 15 by an opening / closing operation, and the check valve 14 is supplied to the bathtub 15. This is to prevent warm water from flowing back to the hot water supply heat exchanger 11 side.
Further, the hot water supply system 10 of the present embodiment is provided with a reheating circuit 16 in addition to the above-described heat exchanger 11 for hot water supply, so that the water once stored in the bathtub 15 can be reheated by the reheating circuit 16. It has become.
The hot water supply system 10 of the present embodiment can supply hot water to other places such as a kitchen, although details are omitted.
[0009]
Now, between the solenoid valve 13 and the check valve 14, the edge cut valve 20 according to the present embodiment is disposed. As shown in FIG. 2, the edge cut valve 20 includes a valve body 21, and the inside of the valve body 21 is divided into a pressure detection chamber 22 and a fluid passage chamber 23 through which hot water passes by a bellophram (diaphragm) 27 described later. Yes.
A primary pressure receiving inlet 26 is opened in the pressure detection chamber 22, and an inlet pipe 17 leading to the water supply source side is connected to the primary pressure receiving inlet 26.
The fluid passage chamber 23 has an inlet 25 leading to the electromagnetic valve 13, an outlet 33 leading to the check valve 14, and an outlet 32 leading to the outside. The fluid passage chamber 23 is partitioned by a partition wall 24 into a front chamber 23A including an inflow port 25 and a rear chamber 23B including an outflow port 33 and a discharge port 32. Furthermore, the partition wall 24 has a communication port 24A that allows the front chamber 23A and the rear chamber 23B to communicate with each other.
The primary pressure receiving port 26, the communication port 24A, and the discharge port 32 are formed coaxially.
[0010]
The belofram 27 is formed in a circular thin film shape with a rubber material having good flexibility, and the entire periphery thereof is fixed to the inner wall of the valve body 21 in a sealed state. A circular fixing plate 28 is attached to the center of the belofram 27 via a slack portion 27A. Therefore, the fixed plate can move along the axial direction by the amount of slack set in the slack portion 27A. Further, the fixed plate 28 is provided with a shaft portion 30 along the axis. The shaft portion 30 extends coaxially through the communication port 24A and extends into the rear chamber 23B, and a valve body 31 is attached to the tip thereof.
[0011]
The valve body 31 has a disc shape and is in close contact with an outlet valve seat 34 projecting annularly from the opening edge of the outlet 32 to the inside of the rear chamber 23B (right side in FIG. 2). In addition to being closed, the communication port 24A can be closed by being in close contact with the communication port valve seat 35 projecting annularly from the opening edge of the communication port 24A to the inside of the rear chamber 23B (leftward in FIG. 2). Further, the valve body 31 is always held at a position where the discharge port 32 is closed. However, when a backflow occurs from the secondary side, that is, in this case, the pressure on the secondary side becomes the pressure on the primary side. Therefore, the pressure in the fluid passage chamber 23 exceeds the pressure in the pressure detection chamber 22. As a result, since the bellophram 27 is bent and deformed toward the pressure detection chamber 22, the valve body 31 moves from a position where the discharge port 32 is closed to a position where the communication port 24 </ b> A is closed.
[0012]
Further, a spring 29 is provided between the fixed plate 28 and the partition wall 24 to urge the fixed plate 28 in the right direction. When the pressure on the secondary side approaches the pressure on the primary side, the valve 29 is immediately turned on. The body 31 is separated from the outlet valve seat 34 so that the outlet 32 can be opened. Specifically, during normal operation, the pressure on the primary side is extremely high compared to the pressure on the secondary side, and the belofram 27 is pressed to the left, so that the valve element 31 is brought into close contact with the outlet valve seat 34, but the reverse flow causes When the pressure in the front chamber 23A increases, the pressure in the front chamber 23A and the pressure in the pressure detection chamber 22 become substantially equal to or higher. Then, the fixing plate 28 is pressed rightward by the urging force of the spring 29, and the valve body 31 is quickly moved to the right side to open the discharge port 32.
[0013]
Next, the operation of the edge cut valve 20 according to the present embodiment will be described.
When performing hot water supply, the solenoid valve 13 is first opened. Then, warm water flows from the inlet 25 into the front chamber 23A. At that time, since the primary water pressure is applied to the pressure detection chamber 22, the pressure detection chamber 22 is higher in pressure than the front chamber 23A. Therefore, the belofram 27 moves to the left side of FIG. When pressed, the valve body 31 keeps the discharge port 32 closed. Accordingly, the hot water flowing into the front chamber 23A flows out of the valve body 21 through the communication port 24A and the outlet 33, and reaches the bathtub 15 through the check valve 14.
[0014]
When the hot water supply to the bathtub 15 is completed, the electromagnetic valve 13 is closed. As a result, the water pressure on the secondary side decreases and the water pressure on the primary side in the pressure detection chamber 22 is still high, so that the displacement of the bellophram 27 does not occur. Therefore, since the valve body 31 is held in a state where the discharge port 32 is closed, the remaining water in the valve body 21 is not drained to the outside as the hot water supply is stopped.
[0015]
By the way, if there is a failure in the check flow prevention function of the check valve 14 when hot water supply is stopped, the water on the bathtub 15 side may enter the valve main body 21 beyond the check valve 14. . In such a case, the water accumulated in the valve main body 21 by the backflow water (the clean water that has not yet been supplied to the bathtub) is pushed back, and as a result, the pressure in the front chamber 23A increases and the pressure detection chamber 22 It is almost equal to or higher than the pressure. Then, since the rightward pressing from the spring 29 acts on the bellophram 27 via the fixed plate 28, the bellophram 27 moves to the primary pressure receiving inlet 26 side. Thereby, the valve body 31 opens the discharge port 32 and closes the communication port 24A. Therefore, the backflow water is drained from the outlet 33 through the outlet 32. Further, since the communication port 24A is closed by the valve body 31, the backflow water does not flow into the front chamber 23A, that is, the situation where the water on the secondary side and the water on the primary side come into contact with each other is reliably avoided. it can.
[0016]
As described above, according to the edge cut valve 20 of the present embodiment, the edge cut operation with respect to the backflow is reliably performed, and the single valve body 31 is configured to open and close the discharge port 32 and open and close the connection port 24A. Therefore, the effect of simplifying the configuration of the edge cut valve 20 is also obtained.
[0017]
<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
[0018]
(1) In the above embodiment, the discharge port 32 and the communication port 24A are closed by the single valve body 31, but the discharge port 32 and the communication port 24A are closed by separate members. It may be.
The discharge port and the communication port are arranged coaxially, but the axes may be shifted.
(2) In the above embodiment, the rubber belofram 27 is used to detect the pressure difference between the primary side water channel and the secondary side water channel. However, the present invention is not limited to this, and any membrane-like member having elasticity may be used. For example, a resin film member may be used.
(3) In the valve body 31 of the above-described embodiment, a rubber packing or the like may be disposed at a contact portion with the discharge port valve seat 34 or the communication port valve seat 35 to improve the adhesion.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a hot water supply system including an edge cut valve. FIG. 2 is a cross sectional view of the edge cut valve. FIG. 3 is a cross sectional view of the edge cut valve when hot water is supplied. Explanation】
20: Edge cut valve 21 ... Valve body (discharge port opening / closing means, shut-off means)
22 ... Pressure detection chamber 23 ... Fluid passage chamber 23A ... Front chamber 23B ... Rear chamber 24 ... Partition wall 24A ... Communication port 25 ... Inlet 27 ... Bellofram (diaphragm)
31 ... Valve body 32 ... Discharge port 33 ... Outlet

Claims (2)

In the valve body, there is a pressure detection chamber capable of detecting the fluid pressure of the fluid on the primary side through a water supply source upstream of the heat exchanger, and a fluid that allows fluid to pass through the downstream side of the heat exchanger The passage chamber, the pressure detection chamber, and the fluid passage chamber are partitioned, a pressure difference between the primary side and the secondary side is detected, and a diaphragm that can be displaced by the pressure difference is provided, and the fluid passage chamber has a primary An inlet connected to the side channel, an outlet connected to the secondary channel, and an outlet for discharge to the outside are opened, and the outlet is always closed in the fluid passage chamber. However, when it is detected that the pressure on the secondary side is higher than the primary side due to the diaphragm, an edge cutting means provided with a discharge opening / closing means that can open the discharge opening based on a bending operation of the diaphragm. A valve,
The diaphragm has a slack portion, and is a belofram movable in the axial direction by the slack portion,
An edge cut-off valve characterized in that a shut-off means for closing a fluid flow path from the primary side to the secondary side is provided in the fluid passage chamber in conjunction with the operation of the discharge port opening / closing means opening the discharge port. .   The fluid passage chamber is partitioned by a partition wall into a front chamber that leads the fluid flow path to the inlet and a rear chamber that leads to the outlet and the outlet, and the partition wall includes the front chamber and the outlet. A communication port for communicating with the rear chamber is opened, and the discharge port opening / closing means is constituted by a valve body that also serves as the blocking means, and the valve body closes the discharge port in conjunction with the displacement of the diaphragm and The edge cut-off valve according to claim 1, wherein the valve is configured to reciprocate between a state in which the communication port is opened and a state in which the discharge port is opened and the communication port is closed.

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