JP2006255003A - Bathroom mist system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent waste water in a circulatory heating circuit (21) from flowing backward to the upstream side in a mist water supply circuit (11) if the waste water is mixed in the circuit (11) in a bathroom mist system equipped with a liquid-liquid heat exchanger (10) for heating water supplied through the circuit (11) by a heating medium supplied through a heat source device (2) through the circulatory heating circuit (21) and a mist spraying part (1) spraying warm water heated by the heat exchanger (10) in a bathroom (4). <P>SOLUTION: A check valve (37) which prevents a backward flow in the mist water supply circuit is provided on the upstream side of the heat exchanger (10) of the mist water supply circuit (11). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bathroom mist device, and more particularly, to a bathroom mist device in which a sauna effect is obtained by spraying hot and cold water in a mist form in a bathroom.

In recent years, bathroom mist devices that increase the sauna effect by spraying heated hot water in a mist form from a mist spraying section installed in the bathroom are becoming popular with bathroom heating devices.
When the hot water for hot water supplied to the kitchen or washroom is branched and used as it is in the mist device, the minimum amount of water that must be passed through the heat exchanger to burn the burner, Even if it is the so-called minimum working water amount, the amount of warm water suitable for spraying mist is large, so if this is sprayed from the mist spraying section, the mist particle size becomes large and the user feels uncomfortable. There was an inconvenience such as giving. Further, in order to reduce the amount of hot water supplied to the mist spraying part, it is conceivable to discharge a part of the hot water, but this is a waste of resources and has a disadvantage of increasing running cost (Patent Document). 1).
In order to prevent such inconvenience, as shown in FIG. 5, the mist spraying section (1) is provided at the downstream end of the water supply circuit (11) for supplying tap water, and the mist spraying section (1) is provided. There is known a configuration in which a liquid-liquid heat exchanger (10) is provided in the middle of the flow path to reach the tap water with a heat medium supplied through a heating circuit (Patent Documents 2 and 3). .

In this, the bathroom heating device (20) is installed in the bathroom (4), and the hot water supply device (2) with a built-in heat source part (23) for bathroom heating is installed outdoors as a heat source, Through the branch circulation circuit (22) branched from the circulation heating circuit (21) circulating between the heating heat source section (23) and the bathroom heating device (20), the liquid heat exchanger (10 ) Is supplied with hot water as the heat medium. Accordingly, the water in the water supply circuit for mist (11) is set to be warmed through the liquid heat exchanger (10).
The liquid heat exchanger (10) is preferably a plate-type heat exchanger with high efficiency, and water on the mist water supply circuit (11) side and branch circulation circuit on both sides of the heat transfer plate (10a). When the hot water on the (22) side flows alternately, heat is exchanged via the heat transfer plate (10a).

In this case, the amount of water to be passed through the water supply circuit for mist (11) is not restricted by the minimum amount of working water, so it should be set to a predetermined amount suitable for spraying from the mist spraying section (1). Can do. Therefore, it is possible to spray the warm water of the water supply circuit for mist (11) heated through the liquid heat exchanger (10) from the mist spraying part (1) into the bathroom (4) with an appropriate mist particle size. it can.
In the above-described conventional mist device, the first and second solenoid valves (31), (32) as opening / closing valves for opening / closing the water supply circuit (11) for the mist are provided downstream of the liquid heat exchanger (10). An automatic drain valve (30) of the water pipe (12) branched from between the first and second solenoid valves (31) and (32) is provided upstream of the liquid heat exchanger (10). Is provided with a pressure reducing valve (36) for adjusting the water pressure in the water supply circuit for mist (11). In addition, a flow control valve for adjusting the flow rate of the circulating hot water sent from the circulation heating circuit (21) to the branch circulation circuit (22) is provided at the branch portion branched from the circulation heating circuit (21) to the branch circulation circuit (22). And a heat exchanger thermistor (34) for detecting the temperature of the circulating hot water.

  At the start of operation of the mist device, the flow rate control valve (33) is fully opened, hot water is sent from the circulation heating circuit (21) to the branch circulation circuit (22), and is branched together with the hot water in the circulation heating circuit (21). By circulating the hot water in the circulation circuit (22), the hot water is warmed to an appropriate temperature. When it is detected by the heat exchanger thermistor (34) that the circulating hot water is sufficiently warm, the second solenoid valve (32) and the automatic drain valve (30) are opened with the first solenoid valve (31) closed, Heat exchange by the liquid heat exchanger (10) is started. The temperature of hot water in the water supply circuit for mist (11) is detected by the mist thermistor (35) provided on the downstream side of the liquid-to-liquid heat exchanger (10). Discharged from the tube (12). When the mist thermistor (35) detects that the temperature of the hot water in the mist water supply circuit (11) is stable, the automatic drain valve (30) is closed and the first electromagnetic valve (31) Is opened, and mist is sprayed from the mist spraying section (1) into the bathroom (4). Thereby, it is possible to spray hot water having an appropriate temperature instead of cold water from the mist spraying section (1) from the initial operation of the mist device.

After the operation of the mist device is completed, if both the first solenoid valve (31) and the automatic drain valve (30) are opened with the second solenoid valve (32) closed, the second solenoid valve (32 ) To the mist spraying section (1), residual water in the mist hot water supply channel (13) is drained from the drain pipe (12) by natural fall. Thereby, various germs propagate in the hot water remaining in the hot water supply channel (13) for mist to become sewage, and this sewage prevents inconvenience of spraying from the mist spraying section (1) at the time of the next mist spraying.
JP 2002-000489 A Japanese Patent Laid-Open No. 2003-334230 Japanese Patent Application No. 2004-239284

  However, generally, an antifreeze liquid such as propylene glycol is introduced into the circulating hot water for heating, and this is supplied to the liquid heat exchanger (10). For example, when the plate heat exchanger described above is used as the liquid heat exchanger (10), the water and mist water supply circuit (11) through the branch circulation circuit (22) side in which the antifreeze liquid is mixed are used. The supplied tap water is configured to alternately flow on both sides of the heat transfer plate (10a). Therefore, in the unlikely event that the heat transfer plate (10a) has a hole or the like and the warm water mixed with the antifreeze liquid has entered the mist water supply circuit (11), the mist water supply circuit (11 ) Becomes negative pressure under some conditions, the antifreeze liquid flows backward through the water supply circuit for mist (11). Since the circulating hot water is circulated and used for many years, it becomes sewage. If the circulating hot water flows backward, there is a problem that the upstream water supply is contaminated.

The present invention has been made in view of such a point, `` a liquid medium heat exchanger for heating water supplied through a water supply circuit for mist with a heat medium supplied from a heat source device through a circulation heating circuit,
In the bathroom mist device provided with a mist spraying section for spraying hot water in the water supply circuit for mist heated by the liquid heat exchanger into the bathroom, the sewage in the circulation heating circuit is used for mist. It is an object of the present invention to prevent contaminated water from flowing backward in the mist water supply circuit to the upstream side even if mixed into the water supply circuit.

[Invention of Claim 1]
The technical means of the invention according to claim 1 for solving the above-mentioned problem is as follows: "A reverse flow that prevents a reverse flow in the water supply circuit for the mist is provided upstream of the liquid heat exchanger of the water supply circuit for the mist. It has a check valve to prevent it.
The technical means operates as follows.
The circulation heating circuit is connected, for example, between a heating terminal such as a floor heating device or a bathroom heating device and a heating heat source unit, and hot water (circulation hot water) circulating in the circulation heating circuit is heated. Water supplied as a medium to the primary side of the liquid-to-liquid heat exchanger and supplied through the water supply circuit for mist on the secondary side is heated. Even if the circulating hot water may be mixed in the water supply circuit for mist in the heat exchanger due to breakage of the liquid heat exchanger, etc., it will be upstream of the liquid heat exchanger. Since the check valve is provided, the circulating hot water does not flow back to the mist water supply circuit upstream.

[Invention of Claim 2]
In the invention according to claim 1, in the case where the mist water supply circuit on the downstream side of the liquid heat exchanger is provided with an on-off valve, the on-off valve and the check valve are in the closed state. Between the two, a closed space is formed, and that portion is heated by the liquid-liquid heat exchanger. Then, the hot water in the closed space in the water supply circuit for mist expands in volume, and an excessive pressure is applied to the on-off valve due to the influence thereof, and there is a problem that spray failure occurs without opening the on-off valve. Further, even when warm water does not flow through the water supply circuit for mist, the same phenomenon occurs because the gas in the closed space expands in volume.
Accordingly, the invention according to claim 2 is made in view of such a point, and “the water supply circuit for the mist is provided downstream of the check valve and upstream of the liquid heat exchanger. An on-off valve that opens and closes is provided. By providing an on-off valve for opening and closing the water supply circuit for mist on the upstream side of the liquid heat exchanger, the downstream side of the liquid heat exchanger is not closed in the water supply circuit for mist. Therefore, even if the water supply circuit for mist is heated by the liquid heat exchanger, the pressure in the water supply circuit for mist does not increase.

[Invention of Claim 3]
3. The bathroom mist device according to claim 2, wherein “a drain valve is provided upstream of the liquid heat exchanger and downstream of the on-off valve, and the drain valve is closed when the on-off valve is closed. When the operation of the mist device is stopped and the drain valve is opened, the residual water in the water supply circuit for mist flows backward from the mist spraying part toward the upstream of the liquid heat exchanger. Then, it is discharged naturally through the drain valve.

[Invention according to claim 4]
The technical means of the invention according to claim 4 is the bathroom mist device according to claim 1, wherein the on-off valve for opening and closing the water supply circuit for mist is provided on the downstream side of the liquid heat exchanger, The on-off valve is set to open at the same time when heating in the liquid heat exchanger is started ”, and the on-off valve is liquid between the on-off valve and the check valve. A heat exchanger is provided, and the hot water in the space between the on-off valve and the check valve is heated by the liquid-liquid heat exchanger, as in the conventional one. Since the on-off valve is opened simultaneously with the heating, the space is opened downstream, and the internal pressure between the on-off valve and the check valve does not increase.

[Invention of Claim 5]
The technical means of the invention according to claim 5 is the bathroom mist device according to claim 1, wherein the on-off valve for opening and closing the water supply circuit for mist is provided on the downstream side of the liquid heat exchanger, An overpressure relief means for releasing the internal pressure of the water supply circuit for the mist is provided downstream of the check valve and upstream of the open / close valve ”, and between the open / close valve and the check valve A liquid heat exchanger is provided, and, similar to the conventional one, hot water in the space between the on-off valve and the check valve is heated by the liquid heat exchanger. Since the pressure in the space between the check valve and the check valve is released by the overpressure release means, the internal pressure between the on-off valve and the check valve does not increase.

The present invention has the following specific effects.
In the invention according to claim 1, since the check valve of the water supply circuit for mist is provided on the upstream side of the liquid heat exchanger, it is possible to prevent the backflow to the water supply upstream of the water supply circuit for mist. Even if circulating hot water, which is sewage in the circulation circuit, is mixed in the mist water supply circuit in the liquid heat exchanger, there is no inconvenience that the clean water is sewed.
In the invention which concerns on Claim 2, even if the on-off valve of the water supply circuit for mist is provided in the upstream of the liquid-liquid heat exchanger, even if the water-supply circuit for mist is heated by the liquid-liquid heat exchanger, the on-off valve Therefore, there is no inconvenience that the on-off valve does not open at the start of operation of the mist device. Therefore, the usability of the mist device is improved and the spraying failure from the mist spraying portion can be prevented. The water supply circuit for mist is heated by the liquid heat exchanger at the time of warm-up in the initial stage of operation of the mist device as described above, but even in this case, it may hinder the opening operation of the on-off valve. Absent.

  In the invention according to claim 3, in addition to the above-described effect, almost all of the residual water in the mist water supply circuit can be drained through the drain valve. The liquid heat exchanger can be emptied, including the corresponding part. In the conventional system described above, the mist hot water supply passage (13) from the second solenoid valve (32) to the mist spraying section (1) can be emptied, but the automatic drain valve (30) is liquid. Since it is provided on the downstream side of the heat exchanger (10), residual water in the liquid heat exchanger (10) is not discharged. For this reason, in the said conventional thing, initial drainage was always required before mist spraying, and there was a problem that running cost was increased together with drainage after operation. In contrast, in the invention according to claim 3, the initial drainage is not required, and the running cost can be reduced and the time required for preparing the operation of the mist device can be shortened.

In the invention according to claim 4, it is possible to prevent inconvenience that excessive pressure is applied to the on-off valve while maintaining the circuit having the conventional configuration in which the on-off valve is provided on the downstream side of the liquid heat exchanger. Even if the control is not changed, the same effect as that of the first aspect can be obtained by changing the control.
In the invention which concerns on Claim 5, the said effect can be acquired only by incorporating an overpressure relief means in the circuit of the conventional structure which provided the on-off valve in the downstream of the liquid-liquid heat exchanger.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
[About the first embodiment]
1 is an explanatory diagram showing a circuit of the mist device in the first embodiment, and FIG. 2 is a flowchart showing processing contents of spray control in the mist device of FIG.
The bathroom (4) is provided with a mist spraying section (1) and a bathroom heating device (20) .The bathroom heating device (20) has a hot water supply device (2 as a heat source device installed outdoors). ) Is supplied with warm water through the circulation heating circuit (21), and the mist spray section (1) communicates with a water supply circuit for mist (11) provided separately from the circulation heating circuit (21). .
The hot water supply device (2) has a heat source section (24) for supplying hot water for supplying hot water to a kitchen or a washroom, and a heat source section (23) for heating for supplying hot water for floor heating or bathroom heating. Is provided. Each heat source section (23) (24) is composed of a burner and a heat exchanger.The heat exchanger of the hot water supply heat source section (24) includes an upstream water supply pipe (25a) and a downstream hot water supply. The pipe (25b) is connected, and the heating device of the heating heat source section (23) is connected to the bathroom heating device (20), which is a heating terminal, via the circulation heating circuit (21). . The circulation heating circuit (21) is connected to another heating terminal together with the bathroom heating device (20).

A branch circulation circuit (22) is branched to the circulation heating circuit (21), and hot water heated by combustion of the burner of the heating heat source section (23) circulates in the circulation heating circuit (21). At the same time, by circulating in the branch circuit (22), the hot water circulating in the branch circuit (22) is supplied to the primary side of the liquid heat exchanger (10) as a heat medium.
The liquid-to-liquid heat exchanger (10) has a flow path formed between a plurality of heat transfer plates (10a) arranged in parallel, hot water circulating in the branch circulation circuit (22), and water supply for mist on the secondary side The plate heat exchanger is configured such that heat can be exchanged through the heat transfer plate (10a) by being configured such that water flowing in the circuit (11) flows alternately.
Thereby, the water supplied through the water supply circuit for mist (11) is heated by the hot water circulating through the branch circulation circuit (22) via the liquid-liquid heat exchanger (10).
As with the conventional mist circuit described above, the flow control valve (33) and the thermistor (34) are provided at the branch from the circulation heating circuit (21) to the branch circulation circuit (22). . A mist thermistor (35) is provided downstream of the liquid heat exchanger (10) in the mist water supply circuit (11), and a pressure reducing valve (36) and a check valve are provided upstream. (37) is provided.

And in the mist circuit of 1st Embodiment of this invention, the solenoid valve (3) as an on-off valve which opens and closes the said mist water supply circuit (11) is provided in the upstream of the liquid heat exchanger (10). In addition, an automatic drain valve (30) is provided in the drain pipe (12) branched from the upstream side of the liquid heat exchanger (10) and the downstream side of the solenoid valve (3), and a water supply circuit for mist It is set so that the hot water in (11) can be discharged from the drain pipe (12) to the outside.
The operation of the bathroom heating device (20) and the mist spraying section (1) are set to be remotely operable, and although not shown, when the mist operation switch of the remote control is turned ON, the heating heat source section (23) is activated. At the same time, the flow control valve (33) is maintained at the set opening, and the hot water in the circulation heating circuit (21) and the branch circulation circuit (22) circulates. Whether the temperature of the hot water is equal to or higher than a set temperature at which the water in the water supply circuit for mist (11) can be effectively heated by the liquid-to-liquid heat exchanger (10) is detected by the thermistor (34) and heated. If it is above the set temperature to be obtained, the solenoid valve (3) is opened, and tap water is passed through the water supply circuit for mist (11). At this time, the automatic drain valve (30) is closed.

The water passed through the water supply circuit for mist (11) is heated when passing through the liquid heat exchanger (10) and sprayed from the mist spraying section (1) to the bathroom (4) in a mist form. Can do. The flow rate control is performed so that the water pressure in the water supply circuit for mist (11) is held constant by the pressure reducing valve (36) and the temperature detected by the mist thermistor (35) is held at the set temperature for mist spraying. The flow rate fed to the branch circuit (22) is adjusted by the valve (33).
When the mist operation switch is turned off, the solenoid valve (3) is closed and the automatic drain valve (30) is opened, and the heating heat source (23) is stopped. The solenoid valve (3) and the automatic drain valve (30) are provided on the upstream side of the liquid heat exchanger (10), and are disposed at a position lower than the mist spraying section (1). Therefore, the residual water in the water supply circuit for mist (11) flows back in the water supply circuit for mist (11) due to natural fall and is blocked by the electromagnetic valve (3), and an automatic drain valve (30 ) Through the drain pipe (12). Thus, hot water does not remain in the mist water supply circuit (11) after use on the downstream side of the solenoid valve (3). Therefore, it is not necessary to drain the residual water from the mist spraying section (1) at the next use, and the running cost can be saved.

The operation control of the mist device described above will be described based on the flowchart of FIG.
First, in step S1, it is determined whether or not the operation switch has been turned ON. When the start of mist operation is commanded, in step S2, the heating heat source section (23) is activated, and the flow control valve (33) is maintained at the set opening. As a result, supply of hot water as a heat medium from the circulation heating circuit (21) to the liquid heat exchanger (10) is started via the branch circulation circuit (22), and the thermistor (34) is detected in step S3. Whether the temperature of the hot water supplied to the liquid-to-liquid heat exchanger (10) is higher than a set temperature (for example, 80 ° C.) that can effectively heat the tap water supplied through the water supply circuit for mist (11) Then, the process proceeds to step S4, where the electromagnetic valve (3) is opened and tap water is supplied to the mist water supply circuit (11). Thereby, the hot water heated for mist spraying by the liquid heat exchanger (10) is sprayed from the mist spraying section (1) into the bathroom (4). At this time, the automatic drain valve (30) is closed.

In this way, the open / close valve (3) is kept open until the operation switch is turned off, and the water supplied through the water supply circuit for mist (11) is heated by the liquid-to-liquid heat exchanger (10). At the same time, spray from the mist spraying section (1) to the bathroom (4).
Then, when the operation switch is turned OFF in step S5 and the mist operation is stopped, the process proceeds to step S6, the combustion of the heating heat source section (23) is stopped, and the water supply circuit for mist ( In 11), the solenoid valve (3) closes and the automatic drain valve (30) opens at the same time, and the residual water in the mist water supply circuit (11) is drained.

In the above embodiment, the check valve (37) for preventing the back flow of water in the mist water supply circuit (11) and the solenoid valve (3) for opening and closing the mist water supply circuit (11) The mist water supply circuit (11) is provided on the upstream side of the heat exchanger (10) and the downstream side of the mist water supply circuit (11) is opened. The inside is not blocked. Therefore, even if the water supply circuit for mist (11) is heated by the mist operation warm-up and the freeze prevention operation for heating and circulating the circulation heating circuit (21), no pressure is applied to the solenoid valve (3). There is no inconvenience that the solenoid valve (3) is difficult to open. Thus, the mist device can be used without any trouble even during the freeze prevention operation.
In addition, generally, an antifreeze liquid such as propylene glycol is added to the hot water as a heat medium circulating in the circulation heating circuit (21) and the branch circulation circuit (22), and this is mixed and supplied to the mist water supply circuit. (11) It is not preferable that the inside is contaminated, but in the unlikely event that the liquid heat exchanger (10) is damaged, the antifreeze liquid input water is mixed into the mist water supply circuit (11). However, since the check valve (37) can prevent further backflow, the antifreeze is mixed into the water supply upstream of the water supply circuit for mist (11) and the water is contaminated. Can be prevented.

[About the second embodiment]
The flowchart shown in FIG. 3 relates to the control of the mist operation of the second embodiment, and the circuit for the mist device is the same as the conventional one shown in FIG. A configuration in which a check valve (37) is provided on the upstream side can be employed.
In this embodiment, when it is determined in step S1 that the operation switch has been turned ON and the start of mist operation is commanded, the heating heat source section (23) is activated in step S2. The flow control valve (33) is maintained at the set opening, and supply of hot water as a heat medium from the circulation heating circuit (21) to the liquid heat exchanger (10) is started via the branch circulation circuit (22). Is done. At the same time, the second solenoid valve (32) and the automatic drain valve (30) are opened, and the supply of tap water to the mist water supply circuit (11) is started. When the mist thermistor (35) detects that the temperature (TW) in the mist water supply circuit (11) is equal to or higher than the mist spraying temperature (YT) in step S3, the process proceeds to step S4. Thus, the first electromagnetic valve (31) is opened, the automatic drain valve (30) is closed, and hot water is sprayed from the mist spraying section (1) to the bathroom (4). In this embodiment, while the temperature (TW) detected by the mist thermistor (35) is equal to or lower than the mist set temperature (YT), the mist water supply circuit (30) is provided via the automatic drain valve (30). 11) It is set to discharge the hot water in the drain pipe (12).
When the mist operation switch is turned OFF in step S5 and the mist operation is stopped, the process proceeds to step S6, the second solenoid valve (32) is closed and the automatic drain valve (30) is opened. Then, the residual water on the downstream side of the second solenoid valve (32) is drained.
In this embodiment, since the second solenoid valve (32) is opened and hot water is passed through the mist water supply circuit (11) from the start of the mist operation, the water in the mist water supply circuit (11) is opened. Pressure does not increase.

[About the third embodiment]
FIG. 4 is an explanatory diagram showing a circuit of the mist device in the third embodiment. Like the conventional circuit shown in FIG. 5, an open / close valve is provided downstream of the liquid heat exchanger (10). The first and second solenoid valves (31) and (32) are arranged as an overpressure relief means upstream of the second solenoid valve (32) and downstream of the check valve (37). When a blow valve (40) is provided and the pressure in the water supply circuit for mist (11) between the second solenoid valve (32) and the check valve (37) becomes equal to or higher than a set operating pressure, the blow valve (40) opens to release pressure. Due to the combustion of the heating heat source section (23), the water supply circuit for mist (11) is heated via the liquid heat exchanger (10), and the second expansion occurs due to the volume expansion of the hot water in the water supply circuit for mist (11). The internal pressure of the water supply circuit for mist (11) increases between the solenoid valve (32) and the check valve (37), but when the pressure exceeds the set operating pressure, the blow valve (40) is activated. Thus, since the hot water in the mist water supply circuit (11) is set to be discharged, the pressure in the mist water supply circuit (11) does not increase excessively. Therefore, even if the second electromagnetic valve (32) is disposed on the downstream side of the liquid-liquid heat exchanger (10), there is no inconvenience that the second electromagnetic valve (32) is not opened due to pressure.
In the embodiment of the present invention, the blow valve is used as the overpressure releasing means. However, if the pressure is not increased by using the accumulator, the drainage does not occur like the blow valve, and the wastewater is treated. There is no need to consider.

Explanatory drawing which shows the circuit of the mist apparatus in 1st Embodiment of this invention. The flowchart figure which shows the processing content of the spray control in the mist apparatus of FIG. The flowchart figure which shows the processing content of the spray control of the mist apparatus in 2nd Embodiment of this invention. Explanatory drawing which shows the circuit of the mist apparatus in 3rd Embodiment. Explanatory drawing which shows the circuit of the conventional mist apparatus.

Explanation of symbols

(1) ・ ・ ・ ・ ・ ・ Mist spraying part
(10) ... Liquid heat exchanger
(11) ・ ・ ・ ・ ・ ・ Water supply circuit for mist
(2) ・ ・ ・ ・ ・ ・ Heat source machine (hot water supply equipment)
(21) ... Circulating heating circuit
(3) ・ ・ ・ ・ ・ ・ Open / close valve (solenoid valve)
(37) ・ ・ ・ ・ ・ ・ Check valve
(4) ・ ・ ・ ・ ・ ・ Bathroom

Claims (5)

A liquid medium heat exchanger that heats water supplied through a water supply circuit for mist with a heat medium supplied from a heat source device through a circulation heating circuit;
In a bathroom mist device provided with a mist spraying section for spraying hot water in the water supply circuit for mist heated by the liquid heat exchanger into the bathroom,
A bathroom mist device comprising a check valve for preventing a back flow in the mist water supply circuit upstream of the liquid heat exchanger of the mist water supply circuit.   2. The bathroom mist device according to claim 1, wherein an opening / closing valve for opening and closing the water supply circuit for the mist is provided downstream of the check valve and upstream of the liquid heat exchanger. A bathroom mist device.   3. The bathroom mist device according to claim 2, wherein a drain valve is provided upstream of the liquid heat exchanger and downstream of the on-off valve, and the drain valve is opened when the mist is stopped with the on-off valve closed. A bathroom mist device characterized by that. In the bathroom mist device according to claim 1,
An on-off valve for opening and closing the mist water supply circuit is provided on the downstream side of the liquid-to-liquid heat exchanger, and the on-off valve opens at the same time as heating in the liquid-to-liquid heat exchanger is started. A mist device for bathrooms, characterized in that it is set to. In the bathroom mist device according to claim 1,
An on-off valve for opening and closing the mist water supply circuit is provided on the downstream side of the liquid heat exchanger, and the mist water supply circuit is located downstream of the check valve and upstream of the on-off valve. An overpressure relief means for releasing the internal pressure of the bathroom is provided.

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