JP3087556B2 - Bath drop-off valve for hot water supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention intervenes between a hot water supply channel from a hot water supply device and a bath additional heating circuit, and drops water from the hot water supply channel into the bath additional heating circuit and non-hot water supply. The present invention relates to a bath dropping hot water supply cutoff valve device that sometimes separates the water on the hot water supply path side and the water on the bath additional heating circulation path side.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional type of such a gate dropping device for hot water supply. This device will be described. Reference numeral 10 denotes a bath heat-up heat exchange can body, and a bath heat-up circulation circuit 30 including a bath return pipe 31 and a bath going pipe 32 is connected to the can body 10. The bathtub water is driven by the circulation pump 41 to enter the bath heat-up canister 10 from the bath return pipe 31, is heated, and circulates through the bath pipe 32 to the bathtub. In addition to the circulation pump 41, the bath return pipe 31 is provided with a water flow switch 42, a bath temperature sensor 43, and a bath water level sensor 44. A hot water supply path 51 for automatic hot water supply from a water heater (not shown) and a water supply path 52 as necessary are provided, and these are supplied to the circulation path 30
Connected to. The cutoff valve device 60 includes a hot water supply valve including a hot water supply solenoid valve 61a for opening and closing the passage of the hot water supply passage 51 and a water supply solenoid valve 61b for opening and closing the passage of the water supply passage 52, and a first check valve 62 provided downstream thereof. A second check valve 63 and a dropping hot water supply path 64 are provided downstream of the first check valve 62, and the first check valve 62 is pushed down, so that the upper opening is closed. An overflow chamber 65 is provided.
The 65 is provided with an overflow solenoid valve 66 and a drain solenoid valve 67. The dropped hot water supply path 64 is connected to the bath return pipe 31 of the reheating circuit 30 through a three-way switching valve 70.

[0003] Hot water is supplied to the bath tub through a controller 80 by a command from a remote controller or the like (not shown) via a controller 80.
a, if necessary, the water supply electromagnetic valve 61b is opened, and the three-way switching valve 70 connects the hot water supply path 64 and the bath return pipe 31 to connect the hot water supply path 51 and the hot water supply path 52 to the hot water supply valve 61a.
, 61b, the first check valve 62, the second check valve 63, the falling hot water supply passage 64, and the three-way switching valve 70 to enter the bath return pipe 31. The bath return pipe 31 is provided with a bypass path 31a for both transports and a check valve 31b provided in the bypass path 31a. By the bypass path 31a and the check valve 31b, a part of the hot water introduced into the bath return pipe 31 can be directly introduced into the bathtub from the bath return pipe 31 through the bypass path 31a,
Smooth bath hot water supply is performed by carrying both the bath return pipe 31 and the bath going pipe 32. The overflow solenoid valve 66 is opened when hot water supply is stopped, and releases air to the overflow chamber.
By supplying the water from 65 to the first check valve 62 side, the continuation of the water flow is cut off and the water is cut off. Also the drainage solenoid valve
Numeral 67 designates water that has leaked during hot water supply and has entered the overflow chamber 65, or the hot water supply path 6 that has been dropped from the side of the circulation path 30 for additional bath heating.
4. Backflow through the second check valve 63 and overflow chamber 65
It is a valve to drain the water that has entered.

[0004]

However, in the above-described apparatus, for example, when the bath is installed at a place considerably lower than the bleed valve device 60, the bleed valve device is not provided.
The air from the 60 side is a negative pressure to recirculate the bath 30
It is easy to enter the side, so a circulation pump with air entrainment
The three-way switching valve 70 was required because the noise 41 easily occurred and the detection of the bath water level by the bath water level sensor 44 became inaccurate. In addition, in the conventional gate valve device 60, water easily accumulates in the overflow chamber 65, and it is necessary to frequently drain the water to the bathtub through the bath reheating circuit 30.Therefore, a drain solenoid valve 67, a three-way switching valve 70 mag was required, and extra time was required for drainage. Similarly, when the bath is placed in a high place, the three-way switching is performed to prevent the hot water from the bathtub from entering the gate valve device 60 due to the positive pressure generated during the bath reheating circulation. Valve 70 was required. And this three-way switching valve
When the hot water supply to the bathtub is carried out, the bypass passage 31a and the check valve 31
b needed. As described above, the conventional apparatus requires the three-way switching valve 70, the bypass passage 31a and the check valve 31b, and has a disadvantage that the cost is high. Further, in the above-mentioned conventional apparatus, there is a drawback that the drainage of the overflow chamber 65 is required, which takes time.

Therefore, the present invention solves the above-mentioned drawbacks of the conventional apparatus, and provides a three-way switching valve 70 and a bypass 31 for both conveyances.
a and check valve 31b are not required, and the cost is low.Moreover, air enters from the hot water supply side into the circulation circuit 30 for additional heating of the bath, generating noise in the circulation pump and inaccurate water level detection by the bath water level sensor. It is an object of the present invention to provide a bath drop-in hot-water supply gate valve device capable of reliably preventing hot water from entering the hot water supply passage from the hot water circulation path 30.

[0006]

In order to achieve the above object, a gate valve device for dropping hot water of the present invention is provided between a hot water supply path from a water heater and a circulation path for hot water for bathing. In some cases, the water from the hot water supply path is dropped into the circulation circuit for bath reheating and the non-hot water supply, and the cutoff valve device for hot water supply for bathing is configured to separate the water on the side of the hot water supply path and the water on the circulation path for reheating bath. A hot water supply valve for opening a passage of the hot water supply path at the time of hot water supply, a first hot water supply check valve downstream of the hot water supply valve for preventing backflow of hot water supply, and the first hot water supply check valve A second hot-water supply check valve which is located below the hot-water supply and prevents a backflow of hot water, and an air charge chamber which is laterally connected to a passage between the first hot-water supply check valve and the second hot-water supply check valve. And an electromagnetic air that can open and close the air charge chamber. A charge valve, and a vacuum breaker provided in a hot water supply path as a part of a gate valve device, and a bath tub position detected by a bath water level sensor of a bath reheating circuit in a bath tub installation early stage and the detected bath tub A first feature is that a controller that determines the specification of the opening / closing control of the electromagnetic air charge valve in accordance with the position is provided. Further, in addition to the first feature, the bath drop-off hot-water supply gate valve device of the present invention always forcibly turns the electromagnetic air charge valve on when the bathtub position is lower than the gate valve device with the vacuum breaker by a certain distance or more. A controller that maintains the closed state and closes the electromagnetic air charge valve only at the time of hot water supply and opens the electromagnetic air charge valve at the time of non-hot water supply, except when the position of the bathtub is lower than the cutoff valve device by a certain distance or more. The second
The feature is.

[0007]

According to the first feature of the present invention, the specification of the opening / closing control of the electromagnetic air charge valve for opening / closing the air charge chamber is determined by the bathtub position detected by the bath water level sensor at the initial stage of the bathtub installation via the controller. Is automatically determined, so there is no error and the bathtub position can be measured and the controller control specifications can be measured without errors compared to when the contractor manually selects the controller control specifications according to the bathtub position when installing the bathtub. You don't have to choose to. Combine both the electromagnetic air charge valve and the vacuum breaker,
By changing the specifications of the electromagnetic air charge valve opening and closing control by the controller according to the position of the bathtub, it is possible to cut off the water flow at the time of non-hot water supply and prevent air from entering the circulation path for reheating the bath And the first and second
The hot water check valve can also prevent intrusion of hot water from the bathtub side. Therefore, a three-way switching valve or the like is not required for connecting the hot water supply path and the circulation circuit for bath heating, and a low-cost apparatus can be obtained. According to the second aspect of the present invention, in addition to the operation of the first aspect, when the bathtub position is lower than the cut-off valve device with the vacuum breaker by a certain distance or more, the electromagnetic air charge valve is forced to operate. Since it is always kept closed, the water flow is cut off according to the vacuum breaker specification. Since the electromagnetic air charge valve is closed, hot water does not flow out of the air charge chamber to the outside when hot water is supplied, and the cutoff valve is used even when negative pressure is applied from the bath reheating circuit when the hot water is not supplied. No air enters from the device side. The electromagnetic air charge valve is closed only at the time of hot water supply except when the position of the bathtub is lower than the cutoff valve device by a certain distance or more, and the electromagnetic air charge valve is opened at the time of non-hot water supply. The water does not flow out from the outside, and when the hot water supply ends, the electromagnetic air charge valve is opened to cut off the water flow. Even when a positive pressure is applied from the side of the bath additional heating circulation path during non-hot water supply, the first and second hot water supply check valves prevent entry into the gate valve device side. The second feature is that a vacuum breaker must be used unless the bathtub is lower than the gate valve device by a certain distance (more precisely, the overflow surface of the bathtub is 300 mm or more than the vacuum breaker). This is a configuration for satisfying a criterion that the specification cannot be made by using. According to the second feature, of course, the opening / closing control specification of the electromagnetic air charge valve for opening and closing the air charge chamber is as follows.
Since it is automatically determined by the bathtub position detected by the bath water level sensor at the beginning of the bathtub installation, compared to the case where the contractor manually selects the control specification of the controller according to the position of the bathtub at the time of installing the bathtub, There is no mistake, and the trouble of measuring the bathtub position and selecting the control specifications of the controller can be omitted. In addition, by changing the specifications of the electromagnetic air charge valve depending on whether the position of the bathtub is lower than the cutoff valve device by a certain degree or more, the water flow can be cut off when hot water supply is stopped, and from the cutoff valve device side (hot water supply channel side). Almost no entry of air into the recirculating water path for bath reheating can eliminate the need for components such as the three-way switching valve for connecting the recirculating path for hot water reheating to the hot water supply path, which was required in the past. Device.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing an example in which a vacuum breaker is provided at another position, and FIG. 3 is a diagram for explaining specifications for detecting a bathtub position. FIG. 4 is a diagram for explaining control specifications of the electromagnetic air charge valve according to the position of the bathtub by the controller.

In FIG. 1, a bath return pipe 31 from a bathtub 20 to a heat exchanger can 10 for bath heating and a bath follower 32 comprising a heat exchanger tube 32 from the heat exchange can body 10 for bath heating to the bathtub 20. A firing circuit 30 is provided. Bath return pipe 31
Has a circulation pump 41, water flow switch 42, bath temperature sensor 4
3. A bath water level sensor 44, which is a pressure sensor, is provided. A hot water supply path 51 for automatic hot water supply from the water heater 100 is connected to the gate valve device 90. The water supply can be connected to the gate valve device 90 as needed.

The cutoff valve device 90 is provided with a hot water supply solenoid valve 91 for opening and closing the passage of the hot water supply passage 51, and a spring 92 downstream thereof.
a A first heated hot water check valve 92 is provided, and a second hot water check valve 95 biased by a spring 95a is provided below the first hot water check valve 92. An air charge chamber 93 is connected to the hot water supply passage between the first hot water check valve 92 and the second hot water check valve 95 from the side. The hot water supply electromagnetic valve 91 is a valve using a diaphragm 91a. The air charge chamber 93 is provided with an air charge port 93a at its ceiling and an electromagnetic air charge valve 96. The electromagnetic air charge valve 96 is connected to the air charge chamber 93.
, So that the air charge port 93a can be closed from the inside. 97 is an overflow port.
Further, in the gate valve device 90, a vacuum breaker 99 is provided in the hot water supply passage 51 before the hot water supply electromagnetic valve 91. Incidentally, the vacuum breaker 99 may be provided below the air charge valve 96 in the air charge chamber 93 as shown in FIG.
The gate valve device 90, the circulating pump 41, and the like are controlled by the controller 80 based on a signal from each sensor or a remote controller (not shown).

The specifications of the operation control of the gate valve device 90 during hot water supply and non-hot water supply by the controller 80 are different depending on the position of the bathtub 20 with respect to the gate valve device 90. This will be described below. That is, first, when the bathtub 20 is located at a position lower than the position of the gate valve device 90 by a certain distance or more, the position of the overflow surface 21 of the bathtub 20 is precisely the vacuum breaker 99 of the gate valve device 90.
In this case, the controller 80 forcibly keeps the electromagnetic air charge valve 96 always closed regardless of whether hot water is supplied or not. Therefore, in this case, the water break between the water on the hot water supply path 51 side and the water on the side of the bath additional heating circuit 30 is performed by the vacuum breaker 99. When the hot water is finished,
When the hot-water supply electromagnetic valve 91 is closed and the hot-water supply is stopped, the negative pressure tends to be generated on the side of the cutoff valve device 90 and the upstream side of the hot-water supply passage 51, so that the vacuum breaker 99 works, air is introduced, and the water flow is cut off. Is done. At the end of hot water supply, the water or air charge chamber flowing downward from the first hot water check valve 92
The water in 93 flows down to the second hot water supply check valve 95, and flows through the second hot water supply check valve 95 to the bath reheating circuit 30 side when there is water pressure. Therefore, water hardly accumulates in the air charge chamber 93. Therefore, it is unnecessary to drain the water in the air charge chamber 93. Of course, the second
The water remaining upstream of the hot water supply check valve 95 flows out at the time of the next hot water supply, so that the accumulated water amount does not gradually accumulate.

At the time of non-hot water supply, the electromagnetic air charge valve 96 is supplied with a negative pressure from the bath reheating circuit 30 due to the bathtub 20 being lower than the cutoff valve device 90 by a certain degree or more.
Is closed even when hot water is not supplied.
Therefore, air is prevented from entering the bath reheating circuit 30 from the air charge chamber 93. Therefore, noise generation of the circulation pump 41 due to air entrainment is prevented, and the bath water level sensor 44 caused by air entrainment is prevented.
Inaccurate water level detection is prevented. In addition, at the time of hot water supply, the controller 80 opens the hot water supply electromagnetic valve 91, so that hot water from the hot water supply path 51 directly connected to the water supply or the like enters the gate valve device 90 at a high pressure from the opened hot water supply electromagnetic valve 91, First
Through the hot water supply check valve 92, falls downward, further flows through the second hot water supply check valve 95, into the bath reheating circuit 30, passes through both the return pipe 31 and the outgoing pipe 32, and becomes a bathtub. Introduced in 20. Since the electromagnetic air charge valve 96 forcibly closes the air charge chamber 93, water is reliably prevented from flowing out through the air charge chamber 93 to the outside.

Next, except when the position of the bathtub 20 is lower than the cutoff valve device 90 by a certain distance, that is, (1) when the position of the bathtub 20 is located above the cutoff valve device 90, and (2) when the bathtub 20 is positioned above the cutoff valve device 90.
Is below the cutoff valve device 90 but the difference is small and less than the fixed distance: In this case, the controller 80 forcibly closes the electromagnetic air charge valve 96 only at the time of hot water supply. When no hot water is supplied, the forced state of the electromagnetic air charge valve 96 is released. When the forced state is released, the electromagnetic air charge valve 96 descends to open the air charge port 93a. Now, when a bath water supply is commanded by a remote controller (not shown) or the like, the controller 80 opens the hot water supply electromagnetic valve 91 and the electromagnetic air charge valve 96.
Is closed and hot water enters the gate valve device 90 at high pressure from the opened hot water supply solenoid valve 91, and the first hot water supply check valve 92
Through the second hot-water supply check valve 95, flows into the circulation path 30 for additional bath heating, and is introduced into the bathtub 20 through both the return pipe 31 and the forward pipe 32. During hot water supply, the electromagnetic air charge valve 96 forcibly closes the air charge port 93a of the air charge chamber 93, so that water is reliably prevented from flowing outside through the air charge chamber 93. Next, when the bath water supply of a predetermined amount is completed, the controller 80 closes the hot water supply electromagnetic valve 91 and releases the forced closing of the electromagnetic air charge valve 96. As a result, the electromagnetic air charge valve 96 opens the air charge port 93a by its own weight. When the air charge port 93a is opened, air enters the hot water supply passage between the first hot water check valve 92 and the second hot water check valve 95 from the air charge port 93a to cut off the water flow.
At the time of non-hot water supply, the air charge port 93a is opened, but even if the bathtub 20 is at a position lower than the gate valve device 90, it is not at such a low position, so the negative pressure that can be applied from the bath reheating circuit 30 side. Is small, and there is little possibility that the air coming from the gate valve device 90 will enter the bath reheating circuit 30. On the other hand, when the bathtub is at a position higher than the gate valve device 90, there is a case where bathtub water tries to enter the gate valve device 90 side. However, the water is prevented by the second hot water supply check valve 95, and the air charge chamber is prevented. The overflow from 93 and the intrusion into the hot water supply path 51 side are also prevented by the first hot water supply check valve 92.

In the above description, the condition that the bathtub 20 is located at a position lower than the position of the gate valve device 90 by a certain distance or more is based on the standards of the Japan Water Works Association. 20 overflows 30 from vacuum breaker 99
Except for the case where the height is lower than 0 mm or more, the water flow can not be trimmed in the specification using the vacuum breaker 99. Therefore, when the overflow surface 21 of the bathtub 20 is 300 mm or less, the electromagnetic air charge valve 96 is always closed using the vacuum breaker 99. Other than that, the electromagnetic air charge valve 96 is used to control the opening and closing to cut off the water flow.

If it is not necessary to comply with the JISA criteria, it is sufficient that the location of the bathtub 20 be above or below the vacuum breaker 99 of the bleeder valve device 90.

In the above description, the operation of controlling the opening and closing of the electromagnetic air charge valve 96 by the controller 80 has different specifications depending on the position of the bathtub 20 with respect to the gate valve device 90. The control specifications are automatically switched according to the position of the bathtub 20.
To explain this, the position of the bathtub 20 with respect to the gate valve device 90 (specifically, the vacuum breaker 99) is as follows.
Since the water level can be detected by the bath water level sensor 44, which is a pressure sensor, the positional relationship between the water level sensor 44 and the vacuum breaker 99 is given to the controller 80 in advance, so that the bathtub 20 (the overflow surface of the bathtub) can be easily formed. It can be determined whether or not the vacuum breaker 99 is 300 mm or less. Therefore, the control specification of the electromagnetic air charge valve 96 can be automatically switched based on this determination. FIG.
4, the bath water level sensor 44, which is a pressure sensor, is provided from the bathtub 20 to a bath reheating circuit.
Since a voltage V corresponding to the water pressure applied to the bath water level sensor 44 via 30 is generated, and the water pressure is proportional to the position of the bathtub 20, the voltage between the bathtub position and the voltage of the bath water level sensor 44 as shown in FIG. A linear relationship can be obtained. Therefore, at the time of the first automatic operation performed after the installation of the bathtub, the bathtub position is detected by the bath water level sensor 44, and the controller 80 can select and determine its own control specification according to the bathtub position. That is, referring to FIG. 4, when the switch for the first automatic hot water supply operation performed after the installation of the bathtub is turned on, controller 80 is turned on.
Closes the electromagnetic air charge valve 96 (S1) and opens the hot water supply electromagnetic valve 91 to start hot water supply (S2). The circulation determination is repeated for a fixed amount of hot water supply, and it is determined whether the bathtub water level by the hot water supply is higher than the bathtub circulation fitting. If the circulation determination is determined to be OK (Yes in S3), the bath water level sensor 44
Is determined to be normal. If it is normal (YES in S4), the bathtub water level at that time is detected as a reference water level and input to the controller 80 (S5). The reference water level is actually a water level slightly above the bathtub circulation fitting (connecting fitting between the bathtub and the circulation circuit for bath reheating), and when this water level is detected, the position of the bathtub 20 and the overflow surface of the bathtub are detected. (Top of bathtub)
The position of is also known. That is, the height from the bottom of the bathtub 20 to the position of the circulation fitting is fixed, and the height from the circulation fitting to the position of the overflow surface (for example, a height of 400 mm from the reference water level).
Is also determined. Of course, the height between the bath water level sensor 44 and the vacuum breaker 99 (vacuum breaker 99)
(It is assumed that the position is higher than the water level sensor 44 by L mm), the position of the reference water level (voltage detection value) at the time of the circulation determination is a fixed value (400 + 300−) higher than the water level sensor 44. L) mm (with at whether or equivalent) or lower in the V _X voltage value, tub 20 (precisely, the overflow surface of the bath) is edge cutting valve device 90 (more precisely, the vacuum breaker 99 located in the edge cutting valve device 90) It can be determined whether the vehicle is below a certain distance or more (S6). The controller 80 for voltage detection value the input is below a predetermined value V _X (YES in S6),
Since the overflow area of the bathtub is lower than the vacuum breaker 99 by 300 mm or more, the electromagnetic air charge valve 96 is forcibly always closed regardless of hot water supply or non-hot water supply as the control specification of the electromagnetic air charge valve 96 (S7). On the other hand, if the voltage detection value not less than a predetermined value V _X (No in S6), since the tub overflow surface is not lower than 300mm than the vacuum breaker 99, the controller 80 is a control specification of the solenoid air charge valve 96, hot water supply At times, the electromagnetic air charge valve 96 is forcibly closed, and when no hot water is supplied, the forced closing of the electromagnetic air charge valve 96 is released (S8). The electromagnetic air charge valve 96 released from the forced closing opens the air charge port 93a by its own weight. still,
In the case of not complying with the standards of JSW, it is determined whether or not the position of the bathtub 20 (more precisely, the overflow surface of the bathtub) is higher than the position of the gate valve device 90 (more precisely, the vacuum breaker 99 of the gate valve device). The control specifications of the electromagnetic air charge valve 96 can be automatically switched.

[0017]

According to the first aspect of the present invention, the opening / closing control of the electromagnetic air charge valve for opening / closing the air charge chamber has the following specifications. In the initial stage of bathtub installation, the bathtub position detected by the bath water level sensor is automatically determined via the controller, so when installing the bathtub, the contractor manually selects the control specification of the controller according to the position of the bathtub In comparison with the above, there is no error, and the trouble of measuring the bathtub position and selecting the control specifications of the controller can be omitted. In addition, by combining both the electromagnetic air charge valve and the vacuum breaker and changing the specifications of the electromagnetic air charge valve opening / closing control by the controller according to the position of the bathtub, it is possible to cut off the water flow during non-hot water supply and reheat the air bath. It is possible to prevent mixing into the circulation path side, and the first and second hot water supply check valves can also prevent intrusion of hot water from the bathtub side. Therefore, there is no need for a three-way switching valve or the like to connect the hot water supply path and the circulation path for post-bath heating,
A low-cost device can be obtained. Claim 2
According to the bath drop-in hot-water supply gate valve device described in
In addition to the effect of the configuration of the above claim 1, when the detected bathtub position is lower than the cut-off valve device with the vacuum breaker by a certain distance or more, the electromagnetic air charge valve is forcibly always kept in the closed state, Except when the position of the bathtub is lower than the threshold valve device by a certain distance or more, a controller is provided that closes the electromagnetic air charge valve only during hot water supply and opens the electromagnetic air charge valve during non-hot water supply. The hot water is reliably supplied at the time of hot water supply without the need for a three-way switching valve or a costly facility for achieving both transports at the connection position with the circulation circuit for bath reheating by filling and using the vacuum breaker properly. In addition, when hot water is not supplied, edging can be reliably performed, and intrusion of air from the edging valve device side can be substantially prevented. It is possible to prevent the bath water from entering from Lu Reheating circulation roadside. Of course, the open / close control specification of the electromagnetic air charge valve for opening / closing the air charge chamber is automatically determined by the bathtub position detected by the bath water level sensor at the initial stage of bathtub installation, so that it is convenient and can measure the bathtub position. There is no need to select the controller control specifications.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an example in which a vacuum breaker is provided at another position.

FIG. 3 is a diagram illustrating specifications for detecting a bathtub position.

FIG. 4 is a diagram illustrating control specifications of an electromagnetic air charge valve according to a position of a bathtub by a controller.

FIG. 5 is a configuration diagram showing a conventional device.

[Explanation of Signs] 10 Heat exchange can body for post-bath heating 20 Bathtub 30 Circulation path for post-bath heating 44 Bath water level sensor 51 Hot water supply channel 80 Controller 90 Edge cutoff device 91 Hot water supply solenoid valve 92 First hot water supply check valve 93 Air Charge room 93a Air charge port 96 Electromagnetic air charge valve 99 Vacuum breaker 100 Water heater

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Katsuhiro Hidaka 32nd Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Pref. (72) Inventor Yuzo Yamamoto 32nd Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Pref. 56) References JP-A-7-158974 (JP, A) JP-A-5-99495 (JP, A) JP-A-3-282154 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , (DB name) F24H 1/46 F24D 17/00

Claims (2)

(57) [Claims] An intervening hot water supply path between a hot water supply device and a hot water recirculation circuit, which drops water from the hot water supply channel into the hot water recirculation circuit during hot water supply and the hot water supply when no hot water is supplied. A bath drop-off hot water supply cutoff valve device that cuts off water on a road side and water on a circulation path side for bath heating, and a hot water supply valve that opens a passage of the hot water supply path at the time of hot water supply, and a downstream of the hot water supply valve. A first hot-water supply check valve located on the side to prevent backflow of hot water supply, a second hot-water supply check valve below the first hot-water supply check valve and preventing reverse flow of hot water supply,
An air charge chamber connected from the side to a passage between the first hot water supply check valve and the second hot water supply check valve; an electromagnetic air charge valve capable of opening and closing the air charge chamber; A vacuum breaker provided in the hot water supply channel as a part of the device, and detecting the bathtub position by a bath water level sensor of the bath reheating circuit in the initial stage of installing the bathtub, and according to the detected bathtub position, A bath drop-off hot water supply cutoff valve device comprising a controller for determining a manner of controlling the opening and closing of an air charge valve. 2. When the detected bathtub position is lower than a gate valve device having a vacuum breaker by a predetermined distance or more, the electromagnetic air charge valve is forcibly kept always closed, and the position of the bathtub is set to the gate valve device. The hot water supply system according to claim 1, further comprising a controller that closes the electromagnetic air charge valve only when the hot water is supplied and opens the electromagnetic air charge valve when the hot water is not supplied, except when the water is lower than a certain distance. Cut-off valve device.