JP3713113B2 - Backflow prevention hopper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a backflow prevention hopper that prevents backflow of fluid, and more particularly, to a backflow prevention hopper that discharges fluid in a fluid discharge chamber when a fluid introduction port is closed to perform edge cutting.
[0002]
[Prior art]
This kind of backflow prevention hopper is used, for example, as a device for cutting off the water flow between the bathtub side and the hot water supply side in hot water supply for a bath. That is, as shown in FIG. 6, clean water is supplied from the water supply pipe 105 to the heat exchanger 106, and hot water is supplied from the hot water supply pipe 107, while the bathtub is on the bathtub side. A circulation circuit 104 that circulates a heater 103 with respect to 101 by a pump 102 is formed. The circulation circuit 104 and the hot water supply pipe 107 are connected via an electromagnetic valve 110 and a check valve 112. However, in order to prevent the hot water in the circulation circuit 104 on the bathtub side from flowing back into the hot water supply pipe 107, the edge circuit is cut off. A device (backflow prevention hopper) 111 is provided.
[0003]
As shown in FIG. 5, the edge cutting device 111 conventionally includes a pouring electromagnetic valve 113 and a negative pressure shut-off valve 115, as well as a drain tank 117 and a water level of the drain tank 117 for draining water from the water discharge chamber. Is connected to the circulation circuit 104 on the bathtub side via a water level switch 119, a check valve 121, and a drain electromagnetic valve 123, and a two-way valve 125 is disposed in the circulation circuit 104, and is disposed in the drain tank 117. The accumulated water is drawn out by flowing it to the bath side by the input of the water level switch as appropriate.
[0004]
[Problems to be solved by the invention]
However, the edge cutting device 111 described above requires a drainage tank 117, a water level switch 119, a drainage electromagnetic valve 123, and the like in order to draw out water from the water discharge chamber, and has a problem that the configuration becomes complicated and the number of parts increases. is there.
[0005]
On the other hand, Japanese Patent Application Laid-Open No. 7-158974 discloses a configuration in which the drain tank is omitted, but since the drainage in the water discharge chamber is performed by its own weight, there is a difference between the constructed bathtub and the appliance. If there is no water, the water cannot be drained, and if the bath is lower than expected, the water in the circulation circuit for the bath will also drain, so the pump priming will run out and the normal water level will be detected by the pressure sensor. The problem that it becomes impossible to occur. Further, in the technique presented in Japanese Patent Application Laid-Open No. 7-158873 and the like, a pressure sensor is provided, and the above-described problem that water is drained is a vacuum breaker type when the bathtub is low, and when the bathtub is high. However, there is a problem that a pressure sensor and a vacuum breaker are required and the control becomes complicated.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide a backflow prevention hopper that can easily perform edge cutting of a fluid with a simple configuration.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is directed to a fluid discharge chamber into which fluid is introduced from an inlet, an inlet opening / closing valve that opens and closes the inlet, and an opening of the inlet opening / closing valve. A first valve body that opens the inlet by fluid pressure and closes the inlet when the inlet opening / closing valve is closed; fluid reservoir means provided on the fluid discharge chamber for storing a part of the fluid passing through the inlet; Opened when the fluid that has been provided in the passage on the outlet port side of the discharge chamber and has passed through the inlet port is guided from the outlet port of the fluid discharge chamber through the passage, and the inlet opening / closing valve closes the inlet side, the fluid discharge chamber is negatively charged. A negative pressure shut-off valve that closes the passage by pressure, a second valve body that communicates the fluid reservoir means and the outlet port of the fluid discharge chamber when the inlet port side is closed by the inlet opening / closing valve, the fluid reservoir means, the fluid discharge chamber, and the fluid When the valve is passed through the passage, the negative pressure shutoff valve closes after the inlet opening / closing valve closes the inlet side. Those comprising a damper means for mitigating that speed. According to the first aspect of the present invention, when the fluid is allowed to flow from the inlet to the outlet of the fluid discharge chamber, the first valve is opened with the fluid pressure by opening the inlet opening / closing valve and opening the inlet side. As the body opens, fluid flows from the inlet to the outlet of the fluid discharge chamber, and a part of the fluid accumulates in the fluid reservoir, and the negative pressure shut-off valve opens to allow the fluid to pass.
[0008]
On the other hand, when the inlet opening / closing valve is closed, the fluid pressure disappears, so the first valve body closes the inlet of the fluid discharge chamber and the second valve body communicates the fluid reservoir and the outlet of the fluid discharge chamber. The fluid in the reservoir and the fluid discharge chamber is passed through the passage. At this time, after the inlet opening / closing valve closes the inlet side, the negative pressure stop valve closes the passage so that the fluid reservoir means and the fluid in the fluid discharge chamber can completely pass through the passage. Means reduce the closing speed of the negative pressure shut-off valve. That is, since the negative pressure shut-off valve closes the passage after the fluid in the fluid discharge chamber is discharged, the fluid in the fluid discharge chamber is discharged and reliable edge cutting (prevention of backflow) can be performed.
[0009]
In addition, since a drain tank, a solenoid valve for drainage, and a pump are not required, the configuration is very simple.
[0010]
The invention according to claim 2 is the invention according to claim 1, wherein the fluid is water introduced from a water heater, and the outlet is connected to a bath tub. This prevents backflow of water introduced to the side.
[0011]
According to the second aspect of the present invention, it is possible to reliably perform edge cutting in the water heater and the bath tub with a simple configuration.
[0012]
The invention according to claim 3 is the invention according to claim 1 or 2, wherein the damper means includes a valve chamber, and the valve chamber has pores that are open to the atmosphere.
[0013]
According to the third aspect of the present invention, as the specific configuration of the damper means, only the pores that open to the atmosphere are formed in the valve chamber, so that the configuration can be very simple. In this case, after the inlet opening / closing valve closes the inlet side, the internal pressure in the valve chamber is recovered to atmospheric pressure over time due to the inflow of air from the pores, so the negative pressure closing valve is closed.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to FIGS. 1 to 3 of the accompanying drawings. The backflow prevention hopper according to the embodiment of the present invention will be described with reference to an example in which hot water is supplied from the water heater 3 to the circulation circuit 17 on the bath side.
[0015]
As shown in FIG. 1, the hot water supply 3 is formed with a hot water supply circuit 10 in which clean water is supplied from a water supply pipe 5 and hot water heated by the heat exchanger 7 is supplied from a hot water supply pipe 9. . On the other hand, on the bathtub 11 side, a bath circulation circuit 17 for circulating a heater (heat exchanger) 15 with respect to the bathtub 11 by a circulation pump 13 is formed.
[0016]
The bath circulation circuit 17 and the hot water supply pipe 9 of the hot water supply circuit 10 are connected via a backflow prevention hopper (edge cutting device) 21 according to the present invention. The backflow prevention hopper 21 causes a backflow phenomenon in which hot water flowing through the hot water supply pipe 9 flows to the bath circulation circuit 17 when the bathtub 11 is filled, while bath water in the bath circulation circuit 17 is sucked into the hot water supply pipe 9 side. It is a device to prevent.
[0017]
This backflow prevention hopper 21 is schematically shown in FIG. 1, and its structure is shown in detail in FIGS.
[0018]
The backflow prevention hopper 21 is generally provided on the inlet passage 23 connected to the hot water supply circuit 10 side, the inlet opening / closing valve 24, the water discharge chamber (fluid discharge chamber) 25 as the edge cut chamber, and the water discharge chamber. Consists of a liquid reservoir (fluid reservoir means) 26, a passage 36, a check valve 28, a negative pressure shut-off valve 27, and a discharge passage 29 for leading hot water passing through the water discharge chamber 25 to the bath circulation circuit 17 side. Has been.
[0019]
One end of the introduction passage 23 is connected to the hot water supply pipe 9 and introduces hot water. The other end portion of the introduction passage 23 is connected to one end portion of the introduction port on / off valve 24, and this introduction port on / off valve 24 is an electromagnetic valve that operates by energizing the exciting coil 24b. The inlet opening / closing valve 24 is provided below the water discharge chamber 25, and the valve body 24 a opens and closes the inlet 30 side of the water discharge chamber 25.
[0020]
In the upper part of the water discharge chamber 25, a liquid reservoir portion 26 for storing water is provided, and the liquid reservoir portion 26 and the water discharge chamber 25 are communicated with each other through a valve hole 31. Note that the upper part of the liquid reservoir 26 is open to the atmosphere.
[0021]
In the water discharge chamber 25, a valve body (first valve body) 33 that functions as a check valve and a valve body 34 that functions as a stop valve are disposed, and these valve bodies 33 and 34 are substantially integrated with each other. It moves by water pressure against the urging force of the coil spring 33a or the urging force in the inner axial direction (V direction). The valve body 33 closes the inlet 30 of the water discharge chamber 25 to prevent back flow of hot water into the hot water supply pipe 9, and the valve body 34 can close the valve hole 31.
[0022]
A discharge port 35 is provided in the water discharge chamber 25, and the discharge port 35 is connected to the passage 36, the check valve 28, and the negative pressure stop valve 27. The check valve 28 is opened by the water pressure on the water discharge chamber 25 side against the urging force of the coil spring 28a.
[0023]
As shown in FIG. 2, the negative pressure closing valve 27 includes a valve body 27 a that opens and closes the opening 44 of the passage 43, a coil spring 27 b, and damper means 40. The damper means 40 includes a valve chamber 41, and the valve chamber 41. And formed fine pores 42. When the valve element 27a is opened in the V1 direction against the urging force of the coil spring 27b by the pressure of hot water introduced into the water discharge chamber 25 by opening the introduction opening / closing valve 24 (for example, 0.5 kg / cm 2), the passage 36 The opening 44 and the passage 43 communicate with each other.
[0024]
The negative pressure shut-off valve 27 disposed on the downstream side of the water discharge chamber 25 has a force (for example, 0.5 kg / cm 2) corresponding to the urging force of the coil spring 27b with the pressure in the water discharge chamber 25 closed by closing the introduction opening / closing valve 24. At this point, the urging force tends to close, but the air inflow into the valve chamber 41 is performed through the pores 42, so the valve chamber 41 closes slowly.
[0025]
When the valve body 27a closes the opening 44, the damper means 40 slows the closing speed, and a predetermined time elapses after the introduction port opening / closing valve 24 closes the introduction port 30 side, and the valve body 27a closes the opening 44. What is necessary is just a thing which makes the return speed of the valve body 27a moderate. That is, the pore 77 slowly introduces air into the valve chamber 41 so that the pressure in the valve chamber 41 does not immediately become atmospheric pressure so that the valve body 27a closes the opening 44 slowly. . For this reason, the pore 77 is sufficiently small, and the diameter of the pore 77 is not particularly limited. For example, a diameter of 0.5 to 1 mm is desirable.
[0026]
Next, the operation of the backflow prevention hopper 21 according to the present embodiment will be described.
[0027]
When hot water from the water heater 3 is supplied to the bathtub 11, the inlet opening / closing valve 24, which is an electromagnetic valve on the hot water supply pipe 9 side, is opened by energizing the exciting coil 24 b, and the hot water pressure on the hot water supply circuit 10 side is opened. The valve body 33 and the valve body 34 of FIG. 2 move together in the V1 direction (upward direction). For this reason, the valve body 33 opens the inlet 30 by the water pressure of hot water, hot water is introduced into the water discharge chamber 25, and the valve body 34 closes the valve hole 31. However, a part (small amount) of hot water passes through the valve hole 31 in a short time until the valve body 34 and the valve body 34 move together in the V1 direction and the valve body 34 closes the valve hole 31. It accumulates in the liquid reservoir 26.
[0028]
When the valve body 33 opens the inlet 30 due to the water pressure of the hot water and the negative pressure shut-off valve 27 is in the open state, the hot water side from the hot water supply circuit 10 side of the water heater 3 to the bath circulation circuit (heating side) 17 Hot water from the water flows in.
[0029]
On the other hand, when the exciting coil 24b of the inlet opening / closing valve 24, which is an electromagnetic valve, is de-energized, the inlet opening / closing valve 24 closes the inlet 30 side of the water discharge chamber 25 and the valve body 33 closes the inlet 30. However, the flow of hot water to the bath circulation circuit (the additional cooking side) 17 does not stop suddenly, and the pressure in the water discharge chamber 25 constituting the hopper decreases. Negative pressure.
[0030]
Accordingly, a small amount of water in the liquid reservoir 26 is sucked into the discharge space 26 a of the water discharge chamber 25, and further, air is sucked through the check valve 28 and the negative pressure shut-off valve 27 together with hot water in the discharge space 26 a. The air is sucked into the bath circulation circuit 17 and the discharge space 26a is filled with air. That is, until all of the water in the discharge space 26 a is sucked into the bath circulation circuit (heating side) 17 through the passage 29, that is, the negative pressure closing valve 27 is operated by the damper means 40. A time difference is produced compared to when the inlet 30 side is closed, and the negative pressure shut-off valve 27 is kept open for a short time. As a result, a small amount of water in the liquid reservoir 26 and hot water in the water discharge chamber 25 can be reliably sent to the bath circulation circuit 17 side.
[0031]
Therefore, since the damper means 40 eases the closing speed of the valve body 27a, the valve body 27a is not closed immediately, but is closed after passing the fluid on the water discharge chamber 25 side. Therefore, reliable edge cutting (prevention of backflow) can be performed between the hot water supply side introduction passage 23 and the bath side circulation passage 17.
[0032]
According to this embodiment, the backflow prevention hopper does not require a drainage tank, a drainage solenoid valve, a pump, or the like that is conventionally required, so that the configuration is extremely simple and reliable edge cutting can be performed.
[0033]
In addition, the damper means 40 can reliably achieve edge cutting (prevention of backflow) with an extremely simple configuration in which only the pores 77 are formed in the valve chamber 41.
[0034]
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. For example, the damper means 27 has a configuration in which the pore 77 is formed in the valve chamber 41. However, the present invention is not limited to this. For example, a step motor or the like is used to slow down the speed at which the valve body 27a is seated on the corresponding valve seat. It may be configured to control as described above.
[0035]
Further, in the above-described embodiment, the liquid reservoir 26 as the fluid reservoir is provided on the water discharge chamber 25. However, as shown in FIG. Good. The liquid reservoir 26 shown in FIG. 4 is configured to extend in a U-shaped tube shape from the bottom to the top of the water discharge chamber 25. In addition, in the modification shown in FIG. 4, the same code | symbol is attached | subjected to the part same as the Example mentioned above, and detailed description of the part is abbreviate | omitted.
[0036]
In the above-described embodiment, the case where hot water is introduced into the circulation circuit on the bath side has been described as an example. However, the present invention is not limited thereto, and the reaction tank is used in other tap water and domestic water, a chemical plant, or the like. The same effect can be obtained even if the reaction solution such as an aqueous solution is supplied to the pipe for preventing the backflow from the reaction tank.
[0037]
【The invention's effect】
According to the first aspect of the present invention, when a fluid is allowed to flow from the inlet to the outlet of the fluid discharge chamber, a part of the fluid is accumulated in the fluid reservoir provided on the fluid discharge chamber, and the inlet When the on-off valve is closed, the damper means is designed to reduce the closing speed of the negative pressure shut-off valve by allowing the fluid between the fluid reservoir means and the water discharge chamber to pass through the passage. ) And a drainage tank, a solenoid valve for drainage, a pump and the like are not required, and the configuration is very simple.
[0038]
According to the invention described in claim 2, in the invention described in claim 1, it is possible to reliably perform edge cutting in the water heater and the bath tub with a simple configuration.
[0039]
According to the third aspect of the present invention, the damper means can have a very simple configuration in which a pore opening to the atmosphere is formed in the valve chamber.
[0040]
[Brief description of the drawings]
FIG. 1 is a circuit diagram of a hot water supply apparatus according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a schematic configuration of a backflow prevention hopper in FIG.
FIG. 3 is a side view having a partially cutout portion showing the backflow prevention hopper shown in FIG. 2;
FIG. 4 is a circuit diagram of a hot water supply apparatus showing a modification of the invention.
FIG. 5 is a circuit diagram of a conventional hot water supply apparatus.
FIG. 6 is a circuit diagram conceptually showing a circuit of a hot water supply apparatus.
[Explanation of symbols]
24 Inlet opening / closing valve 25 Water discharge chamber (fluid discharge chamber)
26 Liquid reservoir (fluid reservoir)
27 Negative pressure shut-off valve 30 Inlet port 33 Valve element (first valve element)
35 Water discharge chamber outlet 40 Damper means

Claims (3)

A fluid discharge chamber into which fluid is introduced from the introduction port, an introduction port opening / closing valve that opens and closes the introduction port side, and the introduction port is opened by the fluid pressure when the introduction port opening / closing valve is opened, and the introduction port is opened when the introduction port opening / closing valve is closed. The first valve body to be closed, the fluid reservoir provided in the fluid discharge chamber and storing a part of the fluid passing through the inlet, and the fluid provided in the passage on the outlet side of the fluid discharge chamber and passed through the inlet A negative pressure closing valve that opens when the inlet opening / closing valve closes the inlet side when leading from the outlet of the fluid discharge chamber through the passage, and a fluid reservoir means that closes the inlet side by the inlet opening / closing valve. The second valve body communicating with the outlet port of the fluid discharge chamber, the fluid reservoir means, the fluid discharge chamber, and the fluid when passing the fluid through the passage, the inlet opening / closing valve closes the inlet port side and then the negative pressure closing valve is closed A backflow prevention hopper comprising a damper means for reducing the speed. The fluid is water introduced from a water heater, and the outlet is connected to a bath tub side to prevent backflow of water introduced from the bath tub to the water heater side. Item 2. The backflow prevention hopper according to item 1. The backflow prevention hopper according to claim 1 or 2, wherein the damper means includes a valve chamber, and the valve chamber has pores that are open to the atmosphere.

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