JPH1089772A - Counterflow preventing hopper and control method of hot-water supplier mounting counterflow preventing hopper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a counterflow preventing hopper, capable of preventing the counterflow of fluid surely with a simple constitution. SOLUTION: A counterflow preventing hopper 21 is provided with an introducing port opening and closing valve 33, an atmosphere opening valve 39, opening a water discharging chamber 25 into atmosphere, and a vacuum closing valve 27, closed when the pressure in the water discharging chamber becomes a negative pressure, while the vacuum closing valve is equipped with a damper means 71, mitigating the closing speed of the valve port 68 when the valve port 68 of the vacuum closing valve is closed. When the introducing port opening and closing valve 33 is closed, the vacuum closing valve is closed after discharging fluid in the water discharging chamber 25. Accordingly, counterflow can surely be prevented and, further, a water discharging tank or a solenoid valve and the like for discharging the water discharging tank will not be necessitated whereby the constitution of the hot-water supplier is very simple.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backflow prevention hopper for preventing backflow of a fluid, and more particularly to a backflow prevention hopper capable of discharging a fluid in a water discharge chamber when a fluid inlet is closed.

[0002]

2. Description of the Related Art This type of backflow prevention hopper is, for example,
In hot water supply for baths, it is used as a device for cutting off the flow of water between a bathtub side and a hot water supply side. That is, as shown in FIG. 5, tap water is supplied to the heat exchanger 106 from the water supply pipe 105, and heated water is supplied from the hot water supply pipe 107, while the bathtub is placed on the bathtub side. A circulation circuit 104 for circulating 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, it is cut off. A device (backflow prevention hopper) 111 is provided.

Conventionally, the edging device 111 includes a pouring solenoid valve 113 and a negative pressure shutoff valve 115 as shown in FIG. 4, and a drain tank 11 for draining water from a water discharge chamber.
7. It is connected to the bathtub side circulation circuit 104 via a water level switch 119 for detecting the water level of the drainage tank 117, a check valve 121, and a drainage solenoid valve 123, and a three-way valve 125 is arranged in the circulation circuit 104. Then, the water accumulated in the drain tank 117 is drained to the bath side by the input of a water level switch as appropriate.

[0004]

However, the above-described edging device 111 has a drain tank 117, a water level switch 119, and a drain solenoid valve 1 for extracting water from the water discharge chamber.
23, a two-way valve 125 and the like are required, and there is a problem that the configuration becomes complicated and the number of parts increases. On the other hand, Japanese Patent Application Laid-Open No. Hei 7-158974 discloses a configuration in which the drainage tank is omitted. However, since the drainage in the water discharge chamber is performed by its own weight, the difference between the installed bathtub and the appliance is reduced. If there is no water, the water cannot be drained, and if the bathtub is lower than expected, the water in the bath circulation circuit will also be drained.Therefore, the pump will no longer be primed or the pressure sensor will detect the normal water level. A problem arises that it is no longer possible. Further, in the technique disclosed in Japanese Patent Application Laid-Open No. 7-158973, for example, a pressure sensor is provided to solve the problem of water leakage as described above. When the bathtub is low, a vacuum breaker type is used. Although a configuration using only the edge cutting method is disclosed, there is a problem that a pressure sensor and a vacuum breaker are required, and control is complicated.

Accordingly, an object of the present invention is to provide a simple configuration,
Another object of the present invention is to provide a backflow prevention hopper in which a drainage tank of a cutoff valve type can reliably cut off a fluid.

[0006]

According to one aspect of the present invention, there is provided a water discharge chamber into which a fluid is introduced from an inlet, an inlet opening / closing valve for opening and closing the inlet,
An air release valve that opens the water discharge chamber to the atmosphere when the inlet opening / closing valve is closed, and when the pressure in the water discharge chamber increases, opens a valve passage communicating the water discharge chamber and the outlet, and the water discharge chamber becomes negative pressure. A negative pressure closing valve for closing a valve passage; the negative pressure closing valve for opening and closing a valve hole formed in the valve passage; and a water discharge chamber for urging the valve body to close the valve hole. When the fluid is filled, the urging means opens the discharge passage with the pressure of the fluid, and the damper means reduces the closing speed of the valve body of the negative pressure closing valve when the valve body closes the valve hole. It is.

According to the first aspect of the invention, when the fluid flows from the inlet to the outlet, the inlet opening / closing valve is opened, and the fluid is caused to flow into the water discharge chamber. In this case, the air release valve is closed, and the valve body is opened in the negative pressure stop valve, and the fluid in the water discharge chamber flows to the outlet.

On the other hand, when the inlet opening / closing valve is closed, the introduction of fluid into the water discharge chamber is stopped, and at the same time, the air release valve is opened to open the water discharge chamber to the atmosphere. The valve body tends to close the valve hole by the urging force of the urging means. However, since the closing speed of the valve body is reduced by the damper means, the valve body is not closed immediately by closing the inlet opening / closing valve, but is closed after the fluid in the water discharge chamber has passed. That is, since the valve body is closed after the fluid in the water discharge chamber is discharged, the fluid in the water discharge chamber is closed and the inlet port opening / closing valve and the valve body are closed in a state of being discharged, so that reliable edging (prevention of backflow) is performed. Can do it.

Further, the construction is extremely simple because no drain tank or drain solenoid valve is required.

According to a second aspect of the present invention, a water discharge chamber into which a fluid is introduced from an inlet, an inlet open / close valve for opening and closing the inlet, and the water discharge chamber open to the atmosphere when the inlet open / close valve is closed. An air release valve, and a negative pressure closing valve that opens a valve passage communicating the water discharge chamber and the outlet when the pressure in the water discharge chamber increases, and closes the valve passage when the water discharge chamber becomes negative pressure. The pressure closing valve is a valve body that opens and closes a valve hole formed in the valve passage, and urges the valve body to close the valve hole, and discharges when the water discharge chamber is filled with fluid by the pressure of the fluid. Urging means for opening the passage, a check valve for opening and closing a check hole formed in the valve passage, and a closing speed when the valve of the negative pressure closing valve closes the valve hole. And a damper means for relaxing.

According to the second aspect of the present invention, in addition to the first aspect, the backflow preventing valve body reliably prevents the backflow from the discharge passage to the water discharge chamber.

[0012] The invention according to claim 3 is the invention according to claim 1 or 2.
In the invention described in (1), an overflow chamber is provided adjacent to the air release valve for receiving a fluid overflowing from the air release valve when the air release valve is opened and closed.

According to the third aspect of the present invention, when the air release valve is opened and closed, the fluid overflowing from the air release valve is temporarily stored in the overflow chamber, and the fluid is stored in the bathtub during the valve closing speed relaxation time by the damper means. Can be discharged.

The invention described in claim 4 is the first to third aspects of the present invention.
In the invention described in the above, the negative pressure closing valve includes a valve chamber for housing the biasing means, the valve chamber is defined by the valve body and the valve wall, the damper means, the valve A pore is formed in the valve wall to open the chamber to the atmosphere.

According to the fourth aspect of the present invention, as the specific configuration of the damper means, only a small opening to the atmosphere is formed in the valve wall defining the valve chamber. It can be. In this case, the internal pressure in the valve chamber is restored to the atmospheric pressure over time by the pores, and the valve is closed when the internal pressure is restored to the atmospheric pressure.

The invention described in claim 5 provides the invention according to claims 1 to 4
The method of controlling a hot water supply device equipped with a hopper according to the above, further comprising: a hot water supply electromagnetic valve that introduces hot water into the backflow prevention hopper; and a flow control valve that controls a flow rate that flows into the water discharge chamber, and closes the hot water supply electromagnetic valve. At this time, the water supply control valve is controlled so that the flow rate flowing to the water discharge chamber becomes a flow rate corresponding to the relaxation speed of the damper means, and then the hot water supply electromagnetic valve is closed.

According to the fourth aspect of the invention, the water control valve is controlled in accordance with the relaxation speed at which the damper means reduces the closing speed of the valve body of the negative pressure closing valve, and thereafter the hot water supply electromagnetic valve is controlled. Close. As described above, by controlling the water amount control valve, the region to be replaced with air can be adjusted and specified.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG.
An embodiment of the present invention will be described in detail with reference to FIG. The backflow prevention hopper according to the embodiment of the present invention will be described using an example in which hot water is supplied from a water heater to a bath-side circulation circuit.

As shown in FIG. 1, hot water is supplied to the water heater 3 from a water supply pipe 5 and a hot water supply circuit 10 for supplying hot water heated by a heat exchanger 7 from a hot water supply pipe 9 is formed. Have been. 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. 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 prevents hot water flowing in the hot water supply pipe 9 from flowing into the bath circulation circuit 17 when the bathtub is filled with hot water, while preventing the hot water in the bath circulation circuit 17 from being sucked into the hot water supply pipe 9. It is. As shown in detail in FIG. 2, the backflow prevention hopper 21 generally includes an introduction passage 23 connected to the hot water supply side, a water discharge chamber 25 serving as an edging chamber, a negative pressure shutoff valve 27, and a check valve (backflow prevention Valve)
82 and a lead-out passage 29 for leading hot water passing through the water discharge chamber to the bath circulation circuit 17. Introductory passage 2
Numeral 3 is connected to a hot water supply pipe 9 and introduces hot water. At the inlet (valve hole) 31 of the water discharge chamber 25 communicating with the introduction passage 23, the valve body 35 of the hot water supply electromagnetic valve (open / close valve) 33 is seated, the inlet 31 is closed, and the valve body is excited by the electromagnetic coil 37. 35 is configured to open the inlet 31 and introduce hot water.

The water discharge chamber 25 is provided with an atmosphere release valve 39 which can open the water discharge chamber 25 to the atmosphere. The atmosphere opening valve 39 is configured to open a valve body 43 that closes an atmosphere opening hole 41 formed in the water discharge chamber 25 by excitation of an electromagnetic coil 45. An overflow chamber 47 surrounding the atmosphere opening hole 41 is formed in the atmosphere opening valve 39, and receives the water overflowing from the water discharge chamber 25. In the overflow chamber 47, a communication hole 49 communicating with the atmosphere is formed.
Is open to the atmosphere.

Further, the water discharge chamber 25 is provided with a vacuum breaker 51 which is opened by the negative pressure in the water discharge chamber 25 and opened to the atmosphere. In the valve chamber 53 of the vacuum breaker 51, a communication hole 55 communicating with the water discharge chamber 25 and an atmosphere opening port 57 opened to the atmosphere are formed, and the atmosphere opening port 57 has a valve body 59 seated thereon. It is closed. The valve body 59 is urged from the valve chamber 53 side by a coil spring 61 so as to close the air opening port 57, and the water discharge chamber 2
The negative pressure of 5 causes the valve body 59 to open the atmosphere opening port 57 against the urging force of the coil spring 61.

When the pressure in the water discharge chamber 25 increases due to the inflow of hot water, the negative pressure shutoff valve 27 disposed downstream of the water discharge chamber 25 opens an outlet passage (outlet) 29, and the water discharge chamber 25 is opened to the atmosphere. When the pressure in the water discharge chamber becomes equal to or less than the urging force of the coil spring, it closes. This negative pressure stop valve 27 is
It has a valve chamber 63 partitioned by the water discharge chamber 25 and a valve body 69, and the valve body 69 is arranged to open and close an upstream opening 68 of a valve passage 67. The valve body 69 is seated on the opening 68 and closes the opening 68. However, when the water discharge chamber 25 is filled with water and receives the pressure, the valve body 69 is elastically deformed and pushed up, and is pushed up.
Is opened. The valve chamber 63 further includes a valve element 6.
A damper (damper means) 71 is provided to reduce the speed when the opening 9 closes the opening 68.

The damper 71 has a valve body 69 having an opening 68.
It is only necessary to slow the closing speed when closing the valve, and it is only necessary to slow the return speed of the valve body. FIG. 2 conceptually shows the damper means, and does not show a specific configuration of the damper means.

More specifically, as shown in FIG. 3, the detailed structure of the damper means is such that the diaphragm of the valve body 69 is urged by the coil spring 73 and the upper end (one end) of the valve passage 67.
When the pressure of the water discharge chamber 25 is received, the valve hole 68 is elastically deformed so as to be pushed up from the valve hole 68, and against the urging force of the coil spring 73.
Is opened. On the other hand, in a valve wall 75 defining the valve chamber 63 in cooperation with the valve body 69, a fine hole 77 open to the atmosphere is formed. When the volume in the valve chamber 63 is reduced due to the deformation of the valve body 69, the pores 77 allow excess air in the valve chamber to escape to the outside, and the valve body 69 as a diaphragm returns to close. In this case, the air is taken in, the inside of the valve chamber 63 is brought into the atmospheric pressure state, and the return of the valve body 69 is promoted. However, since the pores 77 are sufficiently small, sufficient air cannot be instantaneously introduced to increase the volume in the valve chamber 63 due to the return of the valve body 69. For this reason, the return of the valve body 69 becomes slow, and a predetermined time is required. The diameter of the pores 77 is not particularly limited, but is preferably, for example, 0.5 to 1 mm in diameter.

The backflow prevention chamber 65 is disposed downstream of the valve body 69 of the negative pressure closing valve 27, and the valve body 81 of the check valve 82 that opens and closes the valve hole 80 at the lower end of the valve passage 67 is a coil spring. 83, the valve hole 8 at the lower end is urged upward from below.
0 is closed. Note that, instead of the coil spring 83, the flow path may be turned upside down to urge the valve body by its own weight, but it is preferable that the coil spring 83 be provided.

When the valve hole 68 of the valve passage 67 is opened and water flows into the valve passage 67, the valve body 81 is pressed by the water pressure and resists the urging force of the coil spring 83. The valve hole 80 is opened.

Next, the operation of the backflow prevention hopper 21 according to the present embodiment will be described.

To supply hot water from the water heater 3 to the bathtub 11, the electromagnetic coil 37 of the hot water supply electromagnetic valve 33 is energized to be excited, and the valve body 35 is pulled up from the inlet 31 and is moved to the inlet 3.
Open 1. Thereby, hot water flows into the water discharge chamber 25.
In this case, the atmosphere release valve 39 is closed, and the vacuum breaker 51 is closed by being pressed by the urging force of the coil spring 61 and the pressure of the water in the water discharge chamber 25.

When hot water flows into the water discharge chamber 25, the valve body 69 is pressed against the urging force of the spring 73 to open the valve hole 68 by the pressure of the hot water in the water discharge chamber 25 at the negative pressure closing valve 27. . As a result, hot water flows into the valve passage 67 and the valve hole 80
In this case, the valve element 81 is pushed by the flowing hot water and moves downward against the coil spring 83, so that the valve hole 80 is opened. Therefore, the hot water flows from the introduction passage 23 to the water discharge chamber 25, the valve hole 6.
8. It is supplied to the outlet passage 29 through the valve hole 80.

Hot water is introduced from the outlet passage 29 into the circulation circuit 17 on the bath side and supplied to the bathtub 11. A pressure sensor 85 for measuring the water level of the bathtub is provided in the outlet passage 29.
Is provided.

On the other hand, when stopping the hot water supply from the hot water supply device 3, the hot water supply electromagnetic valve 33 is closed to stop the hot water supply. As a result, the introduction of hot water into the water discharge chamber 25 is stopped, but the movement of the discharged hot water is continued, so that the pressure in the water discharge chamber 25 rapidly decreases as the hot water is discharged from the water supply pressure (for example, 10 kg / cm 2). . In the negative pressure closing valve 27, the water discharge chamber 2
When the pressure on the fifth side drops (for example, becomes 0.5 kg / cm 2 or less), the valve body 69 tries to close the valve hole 68 in accordance with the urging force of the coil spring 73 as urging means. However, although the inside of the valve chamber 63 is open to the atmosphere through the small holes 77, sufficient air cannot instantaneously flow into the valve chamber 63. Therefore, the pressure in the valve chamber 63 becomes negative and the return of the valve body 69 is delayed. For example, after taking 0.1 to 0.5 seconds after the closing of the hot water supply electromagnetic valve 33, the valve body 69 is completely returned,
The valve hole 68 is closed.

That is, since the valve body 69 closes the valve hole 68 after a lapse of a predetermined time after the closing of the hot water supply electromagnetic valve 33, the hot water in the water discharge chamber 25 passes through the valve passage 67 and flows backward during the predetermined time. It passes through the prevention chamber 65 and flows out to the outlet passage 29. During this time, in the vacuum breaker 51, the pressure in the water discharge chamber 25 is reduced, so that the valve body 59 opens the atmosphere opening port 57 against the urging force of the coil spring 61, and promotes replacement of the water in the water discharge chamber 25 with air. Thus, the hot water is promoted to drain from the water discharge chamber 25.

After closing the hot water supply electromagnetic valve 33, the valve body 69 is
8 is almost the same as or slightly longer than the time in which the hot water in the water discharge chamber 25 is replaced with air.
May be the time when the spout space shown in FIG. The time during which the hot water in the water discharge chamber 25 is replaced with air depends on the flow rate of the hot water in the water discharge chamber 25 when the hot water supply electromagnetic valve is closed. Therefore, after adjusting the opening of the water volume control valve 1 provided in the water heater 3 according to the capacity of the water discharge chamber 25 (for example, 12 cc) (for example, 10 liter / min, or about 17 cc)
/0.1 sec) By closing the hot water supply electromagnetic valve 33, accurate air replacement can be performed. That is, the hot water in the water discharge chamber 25 passes and is replaced with air, and then the valve body 69 is closed. Further, since the time during which the hot water in the water discharge chamber 25 is replaced with air is controlled (the opening degree of the water amount control 1 is adjusted), air does not enter the circulation circuit 17 (backflow prevention chamber 65) on the bath side. Therefore, a water outlet space viewed with air is formed in the water discharge chamber 25. Then, by opening the air release valve 39, the spout space is opened to the atmosphere, so that the water supply circuit 10 on the hot water supply side and the circulation circuit 17 on the bath side can be cut off by the cutoff valve method. Further, since air does not enter the bath-side circulation circuit 17 (backflow prevention chamber 65), various obstacles due to the entry of air into the piping (erroneous detection of the pressure sensor 85, for example, idling of the pump).
Can be prevented. Therefore, at the time of closing by return of the valve body 69, since the closing speed is reduced by the small holes 77 which are the damper means, the valve body 69 is not closed immediately, but the fluid in the water discharge chamber is passed and filled with air. ,close. When the hot water in the water discharge chamber 25 is discharged, the introduction open / close valve 33 and the valve body 69 are closed, so that the water discharge space filled with air is provided between the supply passage 23 on the hot water supply side and the circulation passage 17 on the bath side. , And reliable edge cutting (prevention of backflow) can be performed.

At this time, the valve body 59 of the vacuum breaker 51 closes the air opening 57 by the coil spring 61, and the water outlet space is filled with air, and the passage to the atmosphere is closed. Opening the air release valve 39 at (or when the air release port 57 is opened) creates a water discharge port space filled with air that has been released to the atmosphere. Can be omitted. Further, even when the atmosphere opening valve is opened, after the water discharge space is filled with air by the vacuum breaker 51 and the air release valve 39 is opened, the water discharge chamber 2 is opened.
Since the water of No. 5 does not come out, the overflow chamber 47 described later is used.
Can be omitted. Fig. 6 (a) shows a vacuum breaker.
In a state where the air opening port 57 is not closed in the atmospheric pressure state (normal) as shown in FIG.
Is used, a water outlet space filled with air released to the atmosphere is created even if the air release valve 39 is omitted. That is, at atmospheric pressure, the valve body 59 (which also functions as a vacuum breaker and the valve body of the atmosphere release valve) forms a space between the valve body 59 and the atmosphere release port 57. The valve body 59 is supported by the spring 61 only from above and below or below the valve body 59 so that the hot water supply electromagnetic valve 33 is opened and the air opening 57 is closed as the pressure of the water discharge chamber 25 rises. When the hot water supply electromagnetic valve 33 is opened, the air opening port 57 is closed by the valve body 59.
Since the speed of the hot water passing through 5 is faster, a small amount of hot water spills from the air opening 57. The spilled hot water is temporarily stored in the overflow chamber 100 above the air opening 57, and is returned to the water discharge chamber 25 together with the air by the negative pressure generated when the hot water supply electromagnetic valve 33 is closed. The negative pressure closing valve 27 is closed, and the water discharge chamber 25 is closed.
Even if the inside is filled with air and becomes atmospheric pressure, the valve body 59 does not block the air opening port 57, so that a water discharge chamber space filled with the air opened to the air is created. Further, the same can be achieved by using only the atmosphere opening valve 39 without using the vacuum breaker 51. That is, the air release valve 39 is opened almost simultaneously with the closing of the hot water supply electromagnetic valve 33. At this time, a small amount of hot water leaks into the overflow chamber 100. However, the pressure in the water discharge chamber 25 immediately becomes negative, and the hot water leaking into the overflow chamber 100 is filled with the air introduced from the atmosphere opening port 49, and then the negative pressure closing valve 27 is closed. . As a result, there is a spout space filled with open air. Then, when the hot water supply electromagnetic valve 33 is opened, the atmosphere release valve 39 is closed. The air release valve 39
May have a shape as shown in FIGS. 6B and 6C. Although the hot water supply solenoid valve 33 and the atmosphere release valve 39 are shown as direct-acting solenoid valves for clarity in the figure, they may be pilot solenoid valves.

Also, when the water opening space is filled with air by the vacuum breaker 51, the air release valve 39 is slightly opened when the vacuum breaker 51 opens the air release port 57 almost simultaneously. Although the hot water overflows, the overflow water is retained in the overflow chamber 47, so that it does not leak. Moreover, the water (hot water) collected in the overflow chamber 47 returns to the water discharge chamber 25 as described above, and is discharged from the water discharge chamber 25.
It is discharged into the bathtub with the hot water inside.

When the hot-water supply electromagnetic valve 33 is opened again and the hot water of the hot-water supply device 3 is introduced into the water discharge chamber 25, the air release valve 39 is provided.
Is closed, and the water discharge chamber 25 is filled with hot water.

According to this embodiment, in the backflow prevention hopper, the conventionally required drainage tank 117, the solenoid valve 123 for drainage, and the two-way valve 12 for switching the drainage flow path are required.
5. Since the check valve 121 and the flow sensor 119 (see FIG. 4) for detecting that water has accumulated in the drainage tank are not required, the configuration is extremely simple, and reliable cutting can be performed.
In addition, the damper means can be surely cut off (prevention of backflow) with an extremely simple configuration in which only the small hole 77 is formed in the valve wall 75 defining the valve chamber 63 together with the valve body 69.

Further, the closing time of the negative pressure shut-off valve is delayed from the time when the hot water supply electromagnetic valve in which the pressure in the water discharge chamber 25 is negative is closed only when the water discharge chamber to which air is to be filled is filled with air. Because of this, air does not enter the parts where air such as pressure sensors and pumps do not need to be in the piping, causing abnormalities in pressure detection by the pressure sensor and noise generated by air entrapment in the pump. Can be prevented. Further, the time setting for delaying the valve closing time by a predetermined time can be controlled by the capacity of the valve chamber 63, the diameter of the fine holes 77, and the like. Also, by controlling the opening of the water flow control valve 1 before closing the hot water supply electromagnetic valve, for example, by closing it at 10 liters / min, the speed of the hot water flowing in the water discharge chamber 25, that is, the hot water supply electromagnetic Since the pressure of the negative pressure generated when the valve is closed, that is, the time during which the water discharge chamber is filled with air, can be controlled, the water discharge chamber 25 in which air is to be supplied and the piping in which air is not required (for example, the backflow prevention chamber 65 is connected to the bathtub) The capacity of the valve passage 67 at the boundary between the pipe and the pipe can be designed to be compact. Further, the reason why the valve closing time is delayed by setting the negative pressure stop valve is that it is not necessary to consider the distance between the bathtub and the device (backflow prevention hopper 21) determined by construction. That is, when the bathtub is below the appliance, a force is applied to the backflow prevention hopper 21 in accordance with the distance so that the water flows out. This is the same force as when the hot water supply solenoid valve is closed, but in the present invention,
If a negative pressure stop valve is used as a check valve, the valve will open as the force becomes excessive, and air will enter into a portion of the pipe where air would otherwise be difficult. On the contrary,
In the case of a negative pressure closing valve, the greater the force, the higher the valve closing pressure, so that air does not enter the piping. In addition, since the backflow from the bathtub that occurs when the bathtub is higher than the appliance can be prevented by the backflow prevention valve body 81 provided in the backflow prevention chamber 65, the appliance using the drainage tank omitted type backflow prevention hopper of the present invention is: The bathtub can be installed above or below the appliance. Therefore, it is necessary to switch between the edge break system when the bathtub is above the appliance and the vacuum breaker system when the bathtub is below the appliance by means of a pressure sensor as seen in the conventional drainage tank elimination type backflow prevention hopper. In addition, since the hopper of the present invention can use the edge-cutting method regardless of whether the bathtub is above or below, not only the pressure sensor and the vacuum breaker can be omitted, but also the switching of the control method based on the head difference between the bathtub and the appliance, etc. Also, the control circuit and sequence can be greatly simplified. Furthermore, in a conventional hot water supply device using a backflow prevention hopper with a drain tank omitted, only a fully automatic type appliance equipped with a pressure sensor can be used on the second floor (when the bathtub is above the appliance),
Vacuum breaker system for semi-automatic appliances without pressure sensor (only for the first floor with a bathtub below the appliance)
So we couldn't respond to the second floor. On the other hand, when the backflow prevention hopper with the drainage tank omitted according to the present invention is used, a semi-automatic device without a pressure sensor can be provided for the second floor.

In the present specification, the reliable cutting (prevention of backflow) is defined as a check valve valve body 81 and a negative pressure stop valve valve body 6.
9. Even if the valve body 35 of the hot water supply electromagnetic valve is opened (a valve opening failure) and the water (dirty water) in the bathtub flows backward from the outlet passage 29 to the inlet passage 23 on the water supply side, this backflow has occurred. The sewage does not flow backward at the height of the valve hole 31 in the water discharge chamber 25. This is because the backflowed sewage overflows from the communication hole 49 before the water level rises to the height of the valve hole 31. As shown in FIG.
The distance up to this point is called the spout space, and as long as this distance exists, backflow does not occur, so that reliable margining (backflow prevention) can be performed. In addition, in FIG. 6A, the distance from the upper end of the overflow chamber 100 to the valve hole 31 is the spout space.

The present invention is not limited to the above-described embodiment, and can be variously modified without departing from the gist of the present invention. For example, the damper means has a configuration in which the small hole 77 is formed in the valve wall 75 defining the valve chamber 63. However, the present invention is not limited to this, and the valve body 69 closes the valve hole 68 using, for example, a step motor. In such a case, the seating speed may be controlled to be slow.

The order in which the negative pressure closing valve 27 and the check valve 82 are provided may be reversed if the pressure sensor 85 is not provided. When the pressure sensor 85 is provided, there is a problem that air enters the backflow prevention chamber 65 (that is, the hot water supply electromagnetic valve 33, the negative pressure shutoff valve 27, and the check valve 82 must be in this order). Otherwise, no problem will occur unless air enters the circulation circuit (up to the pump).

Further, 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 to this. In the case of supplying a reaction solution such as an aqueous solution to the reaction tank, the same effect can be obtained even when the reaction liquid is used in a pipeline for preventing backflow from the reaction tank.

[0043]

According to the first aspect of the present invention, the closing speed of the valve element of the negative pressure stop valve is reduced by the damper means, and the valve body is not immediately closed by closing the inlet opening / closing valve. Since it is configured to close after passing the fluid, when the inlet opening / closing valve is closed, the negative pressure shutoff valve can be closed after discharging the fluid from the water discharge chamber. Therefore, reliable edge cutting (prevention of backflow) can be performed. Moreover, since a drain tank, a solenoid valve for drain, and a pump are not required, the configuration is extremely simple.

According to the second aspect of the present invention, the first aspect is provided.
In the invention described in (1), the border between the water heater and the bath tub can be reliably formed with a simple configuration.

The third aspect of the present invention is the first or second aspect.
In the invention described in the above, when the air release valve is opened and closed, the fluid overflowing from the air release valve can be temporarily stored in the overflow chamber, and can be discharged to the bathtub during the valve closing speed relaxation time by the damper means. It is possible to omit the discharge means such as the drainage tank and the drainage solenoid valve, which were previously described.

According to the invention set forth in claim 4, according to claim 1,
In the inventions of (3) to (3), the damper means forms a pore that is open to the atmosphere in a valve wall that defines the valve chamber.
An extremely simple configuration can be achieved.

The fifth aspect of the present invention provides the first to fourth aspects.
In the control method of the hot water supply device equipped with the hopper described in the above, when the hot water supply electromagnetic valve for introducing hot water into the backflow prevention hopper is closed, the damper means corresponds to the relaxation speed for relaxing the closing speed of the valve body of the negative pressure closing valve Then, since the hot water supply electromagnetic valve is closed after controlling the water amount control valve, the area to be replaced with air can be limited.For example, the capacity of the valve passage 67 can be designed to be compact, and the air replacement in the water discharge chamber can be reduced. It is possible to prevent air from flowing into the piping that does not want air.

[0048]

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a water heater 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 cross-sectional view illustrating a configuration of a negative pressure stop valve illustrated in FIG. 2;

FIG. 4 is a circuit diagram of a conventional hot water supply device.

FIG. 5 is a circuit diagram conceptually showing a circuit of the water heater.

FIG. 6 is a sectional view showing a modified example of the vacuum breaker.

[Explanation of symbols]

Reference Signs List 21 backflow prevention hopper 25 water discharge chamber 27 negative pressure closing valve 33 hot water supply solenoid valve (inlet / outlet opening / closing valve) 39 atmosphere release valve 68 (for negative pressure closing valve) valve hole or opening 69 valve body 71 damper (damper means) 73 (negative) Coil spring (for pressure closing valve) biasing means (for negative pressure closing valve) 80 (for check valve) Valve hole 81 Valve body 82 Check valve (for backflow prevention valve) 83 (for check valve) coil Spring (biasing means (for check valve))

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yukinobu Noguchi 3-4 Fukamidai, Yamato-shi, Kanagawa Prefecture Inside Gaster Co., Ltd. (72) Inventor Takeaki Kawaguchi 3-4 Fukamidai, Yamato-shi, Kanagawa Prefecture Gaster Co., Ltd.

Claims (5)

[Claims] A spout chamber into which a fluid is introduced from an inlet;
An inlet opening / closing valve for opening and closing the inlet, an air release valve for opening the water discharge chamber to the atmosphere when the inlet opening / closing valve is closed, and communicating with the water discharge chamber and the outlet when the pressure in the water discharge chamber increases. A negative pressure closing valve that opens the valve passage and closes the valve passage when the water discharge chamber becomes negative pressure; the negative pressure closing valve opens and closes a valve hole formed in the valve passage; Urging means for urging the valve hole to close and opening the discharge passage with the pressure of the fluid when the water discharge chamber is filled with the fluid, and when the valve element of the negative pressure closing valve closes the valve hole. And a damper means for alleviating the closing speed. 2. A water discharge chamber into which a fluid is introduced from an inlet,
An inlet opening / closing valve for opening and closing the inlet, an air release valve for opening the water discharge chamber to the atmosphere when the inlet opening / closing valve is closed, and communicating with the water discharge chamber and the outlet when the pressure in the water discharge chamber increases. A negative pressure closing valve that opens the valve passage and closes the valve passage when the water discharge chamber becomes negative pressure; the negative pressure closing valve opens and closes a valve hole formed in the valve passage; Urging means for urging the valve hole to close and opening a discharge passage with the pressure of the fluid when the water discharge chamber is filled with fluid, and backflow for opening and closing a backflow prevention valve hole formed in the valve passage. A backflow prevention hopper comprising: a valve body for prevention; and a damper means for reducing a closing speed of the valve body of the negative pressure closing valve when the valve body closes the valve hole. 3. The backflow prevention hopper according to claim 1, further comprising an overflow chamber adjacent to the air release valve for receiving a fluid overflowing from the air release valve when the air release valve is opened and closed. . 4. The negative pressure shutoff valve includes a valve chamber for accommodating the urging means, the valve chamber being defined by the valve body and a valve wall, and the damper means including a valve chamber. 4. A backflow prevention hopper according to any one of claims 1 to 3, wherein pores that open the valve to the atmosphere are formed in the valve wall. 5. A hot water supply solenoid valve for introducing hot water into the backflow prevention hopper, and a flow control valve for controlling a flow rate flowing to the water discharge chamber, wherein when the hot water supply electromagnetic valve is closed, a flow rate flowing to the water discharge chamber is controlled. The backflow prevention hopper according to any one of claims 1 to 4, wherein the hot water supply solenoid valve is closed after controlling the water amount control valve so as to have a flow rate corresponding to the relaxation speed of the damper means. A method for controlling a water heater.