JP3815375B2 - Edge cut valve and hot water supply system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an edge cut valve that prevents sewage from flowing backward from an outlet to an inlet and a hot water supply system using such an edge cut valve.
[0002]
[Prior art]
In recent years, in a hot water supply facility for heating hot water from a water supply source to supply hot water to a bath tub or the like, the water supply once supplied to the bathtub has been connected from the water supply source to prevent it from flowing back to the water supply source. An edge cut valve is attached to the pipe. This edge cut-off valve has a discharge port for discharging the backflow water from the bathtub, as well as an inflow port for supplying clean water from a water supply source and an outflow port for discharging clean water to the bathtub. When supplying hot water, open the switching valve provided at the inlet and close the drain valve provided at the outlet to allow fluid to flow from the inlet to the outlet, and close the switching valve when water stops. By opening the drain valve, the backflow water from the outlet is discharged from the outlet.
[0003]
Conventionally, such an edge cut-off valve is provided with an inflow port and a drain port so as to face each other up and down as in the case of Japanese Utility Model Publication No. 8-3884, and an engaging portion provided on the switching valve is provided. The switch valve and the drain valve are connected to each other and operated by engaging with an engagement receiving portion provided on the drain valve.
[0004]
[Problems to be solved by the invention]
In the edge cut-off valve, it is necessary to close the switching valve and open the drain valve as quickly as possible in order to prevent even a slight backflow from the outlet from entering the inlet when the water supply is stopped. However, in the case where the drain valve is operated in conjunction with the switching valve as described above, although the drain valve and the switching valve are linked, there is a play portion between them, and the switching valve is not opened. For a short time after the start, there is a time during which only the switching valve rises while the drain valve remains unchanged. The reason why the switching valve alone is raised in this way is to open the pilot hole for intake provided in the drain valve and to bring the inside of the edge cut valve to atmospheric pressure. Since there is a time difference until the valve is engaged, there is a drawback that prevents quick opening and closing operations. Furthermore, since both the switching valve and the drain valve must be operated integrally, this may also hinder a quick opening / closing operation.
The present invention has been completed based on the above-described circumstances, and an object thereof is to provide an edge cut-off valve that enables a quick opening / closing operation of a switching valve and a drain valve.
[0005]
[Means for Solving the Problems]
As means for achieving the above object, the invention according to claim 1 is a valve main body in which an inflow opening leading to a primary side pipe, an outflow opening leading to a secondary side pipe, and a drain opening opening to the outside are opened. Includes a switching valve with a return spring that can open and close the inlet, and a drain valve that is always arranged separately from the switching valve and that can open and close the drain port. includes a pressable portion to perform the closing operation on the drain valve by receiving a pressing force from the switching valve when said switching valve I accompanied the valve opening operation of the switching valve is in contact with the drain valve, A second return spring that urges the drain valve in the valve opening direction when the switching valve is closed , and the switching valve is provided with the pressure receiving portion along with the valve closing operation. And the switching valve is moved forward at a speed faster than the opening operation of the drain valve. Independently of the drain valve has a characteristic where the valve closing operation is performed.
[0006]
According to a second aspect of the present invention, in the first aspect of the present invention, the drain valve is disposed below the switching valve, and the switching valve is located upstream of the inflow port. In which a receiving cup capable of receiving the fluid is provided.
[0007]
The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the drain port is connected to a storage tank portion for storing fluid discharged from the drain port.
[0008]
The invention of claim 4 is a pouring circuit for supplying hot water from a heat exchanger to a bathtub, a pouring circuit for circulating the bathtub and the pouring heat exchanger, and an edge cut-off valve incorporated in the pouring circuit. The edge cut-off valve has a valve main body formed with an inflow opening leading to the heat exchanger, an outflow opening communicating with the bathtub, and a drain opening arranged below the inflow opening and opened to the outside. and and the valve body, the inlet and openable return switching valve with spring, this always a switching valve is disposed so as to separate the switching valve with the valve opening operation of the switching valve The pressure receiving portion is in contact with the pressure switch, and the pressure portion is pushed down by the switching valve to close the drain port. However, the spring force of the second return spring is caused by the closing operation of the switching valve. it incorporates a water discharge valve which is opened is, and the switching valve, Of being disconnected from the press receiving portion in accordance with the valve closing operation, independently closing operation with the drain valve with a faster rate than the valve opening operation of the switching valve the discharge valve is made, also the The drain port is connected to a storage tank portion that stores the fluid discharged from the drain port, and the storage tank portion is connected to an annular flow path that leads to the upstream side of the heat exchanger for heating in the tracking circuit. It has the characteristics.
[0009]
[Action and effect of the invention]
<Invention of Claim 1>
When the fluid is about to flow into the inlet from the primary side, the switching valve is opened in response to the pressure from the fluid. As the switching valve opens, the switching valve pushes the pressure receiving portion of the drain valve, so that the drain valve closes the drain port. Thus, the fluid flows into the valve body from the inlet and flows to the secondary pipe through the outlet.
When the inflow of fluid from the primary side stops, the switching valve is closed by the return spring. Along with this, the switching valve is separated from the press receiving portion, so that the drain valve is opened by the second return spring. Thereby, the primary side and the secondary side are held in a state where the edges are cut.
By the way, when the drain valve performs the valve opening operation, the pressing force on the pressure receiving portion is canceled by the start of the valve closing operation of the switching valve, and the valve opening operation can be immediately performed by the spring force of the second return spring. Accordingly, the drain valve can be opened with good response.
[0010]
<Invention of Claim 2>
Since the fluid flow and the fluid weight can be used for the opening operation of the switching valve by the receiving cup, the switching valve can be opened quickly, and consequently, is closed along with the opening operation of the switching valve. The discharge valve can be quickly closed.
[0011]
<Invention of Claim 3>
Since the fluid discharged from the discharge port can be stored in the storage tank section, it is possible to prevent the fluid from flowing out to the periphery and to reuse it.
[0012]
<Invention of Claim 4>
The water stored in the storage tank can be joined to the upstream side of the reheating heat exchanger through the annular flow path. Thereby, since the waste water generated by closing the drain valve can be reused, the surrounding environment is not impaired and the fluid can be effectively used.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in the schematic diagram of FIG. 1, the hot water supply system 10 according to the present embodiment heats water supplied from a water supply with a heat exchanger 11 to form hot water, and mixes the hot water and water with an appropriate temperature. The warmed water passes through the flow control device 12 and is supplied to the bathtub 15 via the solenoid valve 13, the edge cut valve 20, 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 the hot water from flowing back to the flow control device 12 side.
Further, the hot water supply system 10 of the present embodiment is provided with a reheating circuit 16 in addition to the pouring circuit 19 described above, and the hot water once stored in the bathtub 15 can be reheated by the reheating circuit 16. ing.
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.
[0014]
Now, the edge cut-off valve 20 provided between the flow control device 12 and the check valve 14 reliably prevents the hot water supplied to the bathtub 15 from flowing backward to the heat exchanger 11 and mixing with clean water. belongs to.
As shown in FIG. 2, the edge cut valve 20 is provided with a primary side pipe portion 22 communicating with the flow control device 12 on the side surface of the valve body 21, and an inflow chamber 23, a water receiving portion in order from the valve body 21 top. A chamber 24 and an edge cutting chamber 25 are provided, and a secondary side pipe portion 26 that communicates with the check valve 14 through an outlet 29 formed in a side surface of the edge cutting chamber 25 is further provided. The edge cut valve 20 is configured to supply hot water to the primary side pipe part 22 and to allow the warm water to flow out from the secondary side pipe part 26 to the bathtub 15 side. In addition, the edge cut valve 20 of this embodiment is the solenoid valve 13 provided integrally.
[0015]
The inflow chamber 23 has two cylindrical walls that are concentrically large and small, and has a two-layer structure including an outer chamber 23A and an inner chamber 23B. Both chambers 23A and 23B can communicate with each other via the electromagnetic valve 13. It has become. The primary side pipe portion 22 is connected to the outer chamber 23 </ b> A, and the lower end opening of the inner chamber 23 </ b> B communicates with the water receiving chamber 24.
[0016]
A ring-shaped partition member 27 is interposed between the water receiving chamber 24 and the edge cut chamber 25 in a watertight state, and a space around the support tube portion 27A arranged at the center thereof serves as an inflow port 28. . Here, the support tube portion 27A is supported at its upper end by a support member 27B extending radially from the outer peripheral portion of the partition member 27.
The switching valve 31 for opening and closing the inlet 28 has a valve stem 32 along the central axis, and the upper side of the valve stem 32 is slidably inserted into the support cylinder portion 27A. . Further, the lower end portion of the valve rod 32 extends into the edge cut chamber 25, and the switching valve body 31A projects in a flange shape, and is attached to the upper surface of the switching valve body 31A so as not to move relative to the valve rod 32. The switching valve packing 31C is in close contact.
[0017]
On the other hand, the upper end of the valve rod 32 extends into the water receiving chamber 24 and a receiving cup 33 is attached. The valve rod 32 has a return spring 34 interposed between the upper end surface of the support tube portion 27A and the lower surface of the receiving cup 33. The entire switching valve 31 is attached in the direction in which the inlet 28 is closed, that is, in the lifting direction. It is fast.
The receiving cup 33 is opened so as to face the lower surface of the inner chamber 23B coaxially, and the opening diameter thereof is formed to be larger than the inner diameter of the lower end opening portion of the inner chamber 23B of the inflow chamber 23. Yes. The receiving cup 33 receives the hot water flowing in through the inner chamber 23B of the inflow chamber 23, thereby causing the flow and weight of the hot water to act on the switching valve 31 shaft and moving the switching valve body 31A downward. The inlet 28 is opened. Further, a hole 35 is formed in the bottom surface of the receiving cup 33. When the hot water supply is stopped, the residual water in the receiving cup 33 is discharged downward from the hole 35 to reduce the weight so that the switching valve body 31A can be reduced. The inflow port 28 is prevented from being opened carelessly.
[0018]
A drainage port 30 is formed in the lower part of the edge cutting chamber 25 so as to be coaxial with the inflow port 28.
A cylindrical portion 30A supported by a radial arm 30B is formed at the center of the drain port 30, and a resin receiving cylinder 30C that supports a pilot shaft 37 described later is fixed to the center of the cylindrical portion 30A. .
In addition, a cylindrical wall protrudes around the drain port 30 in the edge cut chamber 25, and an annular drain valve seat 36B projects from the upper end of the wall.
The drain valve 36 for opening and closing the drain port 30 has a pilot shaft 37 along its central axis. A drain valve body 36A projects in a flange shape from the upper end thereof, and a drain valve packing 36C that is immovably attached to the pilot shaft 37 is in close contact with the lower surface of the drain valve packing 36A. The drain port 30 can be opened and closed by the contact of 36C with the drain valve seat 36B.
The lower end portion of the pilot shaft 37 is divided into a plurality of leg pieces 37C, and each can be elastically deformed in the constriction direction as a whole. Further, a retaining claw 37D protrudes from the tip of each leg piece 37C and can be locked to the lower end surface of the receiving cylinder 30C. Further, a pilot hole 37 </ b> A penetrates along the axis of the pilot shaft 37. The upper end of the pilot hole 37A can be opened and closed by a pilot valve body 40 (made of rubber) attached to the lower end of the valve rod 32 in the switching valve 31. The pilot hole 37A is for introducing the atmosphere into the edge cut chamber 25 to make the inside equal to the atmospheric pressure so that the opening operation of the drain valve 36 is smooth, and the drainage from the drain port 30 is promoted.
Furthermore, a second return spring 38 is interposed between the arm 30B of the cylinder portion 30C and the drain valve packing 36C, and urges the drain valve 36 in the direction in which the drain port 30 is opened, that is, in the lifting direction. ing.
In the present embodiment, the spring force of the return spring 34 is set stronger than that of the second return spring 38.
[0019]
Further, a drain tank 41 is disposed below the drain port 30.
The drain tank 41 is for temporarily storing drainage from the drain port 30. An overflow pipe 43 is provided on the upper part of the drain tank 41, and when a predetermined amount or more of drainage accumulates, the drain tank 41 goes to the outside. It is supposed to be discharged. In the present embodiment, the overflow pipe 43 has a function of ventilating the drain tank 41 and maintaining the drain tank 41 at atmospheric pressure.
In addition, a reflux path 17 is formed from the drain tank 41 to the upstream side of the tracking circuit 16, and a water level detector 42 is provided on the side surface inside the drain tank 41, and when a predetermined water level is reached. The drain valve 18 is opened, and the accumulated waste water is returned to the tracking circuit 16 via the reflux path 17.
[0020]
Subsequently, when the electromagnetic valve 13 for explaining the operation of the edge cut valve 20 is opened and hot water flows into the inner chamber 23B, the hot water flows into the receiving cup 33. Then, since the receiving cup 33 is pressed downward by the flow and weight of the hot water flowing into the receiving cup 33, the switching valve body 31A moves downward against the return spring 34 and the switching valve 31 is opened. The warm water flows into the edge cutting chamber 25 through the inlet 28.
At this time, the pilot valve body 40 abuts against the upper end of the pilot shaft 37, pushes the entire drain valve 36 against the second return spring 38, and closes the drain port 30.
As a result, the hot water reaches the bathtub 15 through the outlet 29 and further through the check valve 14.
[0021]
When the electromagnetic valve 13 is closed, the supply of hot water from the inflow chamber 23 is stopped and the pressure on the receiving cup 33 is lost, so that the switching valve body 31A is moved upward by the return spring 34 and closes the inflow port 28. At this time, since the spring force of the return spring 34 is set to be stronger than that of the second return spring 38, when the depression of the drain valve 36 by the pilot valve body 40 is released, the switching valve 31 is more than the drain valve 36. Also rise at a faster speed. Therefore, the pilot valve body 40 is separated from the pilot shaft 37 and opens the pilot hole 37A. Thereby, the inside of the edge cutting chamber 25 becomes atmospheric pressure. Since the drain valve 36 is raised almost simultaneously with the opening of the pilot hole 37A, the drain port 30 is opened, and the hot water in the edge cut chamber 25 is drained to the drain tank 41.
[0022]
If hot water is supplied in a state where the check valve 14 is damaged, if the supply of hot water is interrupted, the backflow water may flow into the edge cutting chamber. Even in such a case, when the switching valve 31 rapidly closes and the closing operation of the switching valve 31 is started, the drain valve 36 is immediately opened without a time difference, so that the backflow water flows backward to the temporary side. The drain tank 41 is surely drained through the drain port 30.
[0023]
Thus, according to the edge cut valve 20 of the present embodiment, when the switching valve 31 is closed, the drain valve 36 can be opened without delay. Thereby, the edge cutting operation can be ensured.
Further, since the edge cut valve 20 can use the flow of fluid and the weight of the fluid for the opening operation of the switching valve 31 by the receiving cup 33, the switching valve 31 can be opened quickly, and consequently the switching valve 31 A quick valve closing operation of the discharge valve 36 that is closed with the opening operation of the valve 31 is enabled.
According to the hot water supply system 10 of the present embodiment, the water stored in the drain tank 41 is merged to the upstream side of the reheating circuit 16 through the annular flow path 17, heated by the reheating circuit 16, and then poured into the bathtub 15. it can. Thereby, since the waste water generated by the opening / closing valve operation of the drain valve 36 can be reused, the surrounding environment is not impaired and the water can be effectively used.
[0024]
<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.
(1) In the above embodiment, the electromagnetic valve 13 is formed integrally with the edge cut valve 20, but it may be a separate body.
Further, the check valve 14 may be integrally formed on the downstream side of the edge cut valve 20 of the above embodiment.
(2) Further, in the above embodiment, the spring force of the return spring 34 is set stronger than the second return spring 38, but the spring force of the return spring 34 is set weaker than the second return spring 38. There may be.
[Brief description of the drawings]
1 is a schematic view of a hot water supply system. FIG. 2 is a cross-sectional view of an edge cut valve. FIG. 3 is a cross-sectional view of an edge cut valve when hot water is supplied.
DESCRIPTION OF SYMBOLS 10 ... Hot water supply system 11 ... Heat exchanger 15 ... Bath 16 ... Reheating circuit 17 ... Recirculation path 20 ... Edge cut valve 21 ... Valve body 28 ... Inlet 29 ... Outlet 30 ... Drain port 31 ... Switching valve 33 ... Receiving cup 34 ... Return spring 36 ... Drain valve 37 ... Pilot shaft (press receiving part)
38 ... Second return spring (second return spring)
41 ... Drain tank (storage tank)

Claims (4)

In the valve body in which an inlet leading to the primary side piping, an outlet leading to the secondary side piping and a drain opening opened to the outside is opened, a switching valve with a return spring capable of opening and closing the inlet, This switching valve is always separated from the built-in drain valve that can open and close the drain port,
Wherein the discharge valve, pressing to perform a closing operation to the drain valve by receiving a pressing force from the switching valve when said switching valve I accompanied the valve opening operation of the switching valve is in contact with the drain valve A receiving portion, and a second return spring that biases the drain valve in the valve opening direction when the switching valve is closed ;
In addition, the switching valve is disconnected from the pressure receiving portion along with the valve closing operation, and the switching valve is closed independently of the drain valve at a speed higher than the valve opening operation of the drain valve. edge cutting valve, characterized in that is made.   2. The thing according to claim 1, wherein the drain valve is arranged below the switching valve, wherein the switching valve is provided with a receiving cup capable of receiving fluid at a position upstream from the inlet. The edging valve.   The edge cut-off valve according to claim 1 or 2, wherein the drainage port leads to a storage tank portion for storing fluid discharged from the drainage port. A pouring circuit that supplies hot water from the heat exchanger to the bathtub, a pouring circuit that circulates between the bathtub and the heat exchanger for pouring, and an edge cut-off valve incorporated in the pouring circuit. The valve has a valve main body formed with an inflow opening leading to the heat exchanger, an outflow opening leading to the bathtub, and a drain opening arranged below the inflow opening and opened to the outside.
And The valve body, contact with the inlet back openable switching valve with spring, and the switching valve is always the arranged separated with the valve opening operation of the switching valve said switching valve A pressure receiving portion that is pushed down by the switching valve to close the drain port, and is opened by the spring force of the second return spring as the switching valve is closed. And a drain valve to be built,
In addition, the switching valve is disconnected from the press receiving portion in accordance with the valve closing operation, and the switching valve is closed independently of the drain valve at a speed higher than the valve opening operation of the drain valve. Was made,
In addition, the drain port leads to a storage tank portion that stores the fluid discharged from the drain port, and an annular flow path leading to the upstream side of the heating heat exchanger in the tracking circuit is connected to the storage tank portion. A hot water supply system characterized by

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