JP5241662B2 - Mist generator - Google Patents

Description

  The present invention relates to a mist generating apparatus for injecting mist into a bathroom, for example, and more particularly to a mist generating apparatus having a function of determining the presence or absence of leakage in a liquid heat exchanger that heats mist water.

  Referring to FIG. 1, the mist generator includes a mist water supply path 63 that supplies tap water to a mist nozzle head 3 provided in a bathroom. In the middle of the mist water supply path 63, a water supply valve 73, a liquid heat exchanger 61 for heating the mist water to a predetermined temperature, and a mist valve 74 are provided from the upstream side.

  The liquid heat exchanger 61 is partitioned by a partition wall 62 so that, for example, a part of the heat medium circulation path 51 through which a high-temperature heat medium heated by the heat source device 4 flows and a part of the water supply path 63 for mist are adjacent to each other. And formed integrally. The partition wall 62 enables heat exchange between a high-temperature heat medium circulating in the heat medium circulation path 51 and mist water flowing in the mist water supply path 63. Therefore, when damage such as perforation occurs in the partition wall 62, a leak that causes internal liquid leakage between the heat medium circulation path 51 and the water supply path 63 for mist occurs.

  In order to detect such a leak, the mist valve 74 provided in the mist water supply path 63 is closed immediately after the mist operation control is finished, the water supply valve 73 is opened, and the pressure of tap water in the mist water supply path 63 is opened. There is a mist generating device that detects the temperature of the heat medium in the heat medium circulation path 51 over time, and determines the presence or absence of leakage based on the detected change state of the heat medium temperature (Patent Document 1). . This is because when the water for mist flows from the water supply path for mist 63 into the heat medium circulation path 51 due to leakage, the degree of temperature decrease of the heat medium in the heat medium circulation path 51 becomes greater than the degree of temperature decrease due to natural heat dissipation. Is used to determine the presence or absence of leaks.

JP 2007-212096 A

  By the way, in the leak determination by the mist generator, high-temperature mist water exists in the mist water supply path 63 of the liquid heat exchanger 61 immediately after the mist operation control ends. Therefore, when a leak has occurred in the liquid heat exchanger 61, the hot mist water flows from the mist water supply path 63 into the heat medium circulation path 51 and then the cold mist water flows into the heat medium circulation path 51. The temperature starts to drop. As a result, it takes time until the degree of temperature change of the heat medium in the heat medium circulation path 51 becomes larger than the degree of temperature decrease due to natural heat dissipation, and accurate leak determination cannot be performed in a short time.

  The heat medium in the heat medium circuit 51 uses an antifreeze liquid so that it does not freeze in winter. Therefore, since it takes time until the leak determination can be performed reliably, if a leak occurs, a large amount of mist water flows into the heat medium circulation path 51. As a result, the concentration of the antifreeze solution is greatly diluted, and in the case of reuse, it is necessary to readjust to a concentration having a function as the antifreeze solution.

  This invention is made in view of the said situation, and makes it a subject to provide the mist generator which can perform leak determination reliably in a short time.

The mist sauna apparatus according to the present invention is
A part of the heat medium circulation path that circulates and supplies the hot water heated by the heat source machine by driving the circulation pump and a part of the mist water supply path that supplies the mist water to the mist nozzle head are adjacent to each other, and the heat medium circulation In a mist generating apparatus comprising a liquid-to-liquid heat exchanger that heats mist water flowing in a mist water supply path using a heat medium flowing in the path,
The heating medium circulation path is branched into a mist heating medium circulation path connected to the liquid heat exchanger and a heating heating medium circulation path connected to the heating heat exchanger,
A heating medium temperature detecting means for detecting the temperature of the heating medium in the heating medium circulation path provided in the heating medium circulation path;
An on-off valve provided in the heating heat medium circuit, and shuts off the supply of the heat medium to the heating heat exchanger by closing the valve;
A flow rate control valve that is provided in the mist heat medium circulation path and shuts off the supply of the heat medium to the liquid-liquid heat exchanger by closing the valve;
A water supply valve that is provided in a water supply passage for mist upstream of the liquid heat exchanger, and shuts off the water supply to the liquid heat exchanger when the valve is closed;
A mist valve that is provided in a mist water supply channel downstream of the liquid heat exchanger and shuts off the water supply to the mist nozzle head when closed;
A drainage valve provided in a drainage channel branched from the water supply channel for mist downstream from the liquid heat exchanger, and draining the water supply channel for mist by opening the valve;
A control unit for controlling opening and closing of the on- off valve, flow control valve, water supply valve, mist valve and drain valve,
The heating medium temperature detecting means in the heating medium circulating path connected to the mist heating medium circulating path on the opposite side from the position where the flow rate control valve is provided in the heating medium circulating path for the mist. And the on-off valve,
After the mist operation control is completed, the control unit closes the flow rate control valve and the mist valve, and after draining the hot water in the water supply path for mist in the liquid heat exchanger in a state where the water supply valve and the drain valve are opened, The heating heat detected by the heat medium temperature detecting means is closed while the water supply valve and the drain valve are closed and the flow rate control valve is closed while the on-off valve is open while the leak judgment of the liquid heat exchanger is being performed. A control configuration is adopted in which the presence or absence of leakage in the liquid-to-liquid heat exchanger is determined based on the temperature drop of the heat medium in the medium circulation path .

  With the above configuration, since the high temperature mist water in the mist water supply channel is drained and the normal temperature mist water is allowed to flow before starting leak judgment, the temperature of the mist water in the liquid-to-liquid heat exchanger can be set to room temperature in a short time. Can be lowered. As a result, the temperature difference between the temperature of the heat medium at the time of leak determination and the water for mist can be increased, the detection sensitivity in the heat medium temperature detecting means when the liquid heat exchanger has leaked increases, and the temperature of the heat medium The accuracy of leak determination based on the degree of decrease is increased, and reliable leak determination can be performed at an early stage. Moreover, even if the leak location is near the mist water outlet of the liquid heat exchanger where the mist water having the highest temperature is present, reliable leak determination can be performed early.

  Further, since the temperature difference between the heat medium and the mist water at the time of leak determination is large, if the leak has occurred, the leak amount from the start of the leak determination is short even if the amount of mist water mixed into the heat medium circuit is small. Since the temperature of the heat medium decreases with time, the degree of temperature decrease is greater than the degree of temperature decrease due to natural heat dissipation immediately after leak determination. As a result, since reliable leak determination can be performed early, even when an antifreeze liquid is used as a heat medium, mixing of mist water into the antifreeze liquid can be suppressed, and dilution of the antifreeze liquid at the time of leak determination can be suppressed.

In the mist generator,
The heating medium temperature detecting means in the heating medium circulating path connected to the mist heating medium circulating path on the opposite side from the position where the flow rate control valve is provided in the heating medium circulating path for the mist. And the on- off valve,
Wherein, during the leakage determination of liquid-liquid heat exchanger shall be the state of opening the opening and closing valve is closed the flow control valve.

Thereby, during the leak determination, the flow control valve on one side via the liquid-liquid heat exchanger in the heat medium circulation path for mist is closed, so that for the mist on the opposite side via the liquid-liquid heat exchanger By opening the opening / closing valve in the heating medium circulation path connected to the heating medium circulation path, the heat medium of the liquid heat exchanger is provided with the heating medium temperature detecting means of the heating medium circulation path. It becomes easy to flow toward the side. Therefore, when a leak has occurred in the liquid-to-liquid heat exchanger, normal temperature mist water that has flowed into the mist heat medium circulation passage easily flows to the heat medium temperature detection means side, and the heat medium temperature detection means Detection sensitivity is improved.

In the mist generator,
Mist water temperature detecting means for detecting the temperature of the mist water flowing out from the liquid heat exchanger is provided in the water supply channel or drainage channel for mist,
The control unit opens the water supply valve and the drain valve when a sufficient time has elapsed to finish the mist operation control and the circulation pump completely stops, and the mist water temperature is detected based on the detection result of the mist water temperature detecting means. It is preferable to adopt a control configuration in which the water supply valve and the drain valve are closed when the temperature of the water drops to a predetermined temperature.

  As a result, when performing the leak determination, the time for draining the mist water from the mist water supply channel of the liquid heat exchanger can be made as short as possible. The amount of running water can be reduced.

  As described above, according to the mist generating device according to the present invention, since the temperature of the mist water in the mist water supply channel in the liquid heat exchanger is lowered to room temperature, the leak is determined, so the liquid heat exchange The detection sensitivity of the heat medium temperature detecting means when the vessel has leaked is increased, the leak determination accuracy is increased, and a reliable leak determination is possible at an early stage. In addition, since the leak judgment can be performed in a short time, even if an antifreeze liquid is used as the heat medium, the amount of leaked mist water mixed in the heat medium circulation path can be suppressed to suppress the dilution of the antifreeze liquid. .

It is a block diagram which shows the outline of the whole structure of the mist sauna apparatus which has the mist sauna function by a mist generator. It is a flowchart which shows the leak determination process of the mist generator by embodiment. It is a graph which shows the temperature change of the heat-medium temperature at the time of the leak determination of the mist generator by embodiment.

  Referring to FIG. 1, the mist sauna device includes a bathroom heater 2 and a mist nozzle head 3 disposed in a bathroom 1, and a heat source device 4 and a mist unit 6 disposed outside the bathroom 1. The mist unit and mist nozzle head serve as a mist generator. The bathroom heater 2 includes a circulation fan 22 that circulates the air in the bathroom 1 and a heating heat exchanger 21. The heating heat exchanger 21 is connected to the heat source unit 4 disposed outside the bathroom 1 (outdoors and the like) via the heat medium circulation path 5 and the heating heat medium circulation path 52. The heat medium (water, antifreeze liquid, etc.) heated by the heat source unit 4 is driven by the heat pump 4 of the heat source unit 4 via the heat medium circuit 5 and the heating medium circuit 52 for heating. The air supplied to 21 and heated by the heating heat exchanger 21 is circulated to the bathroom 1 by the circulation fan 22 to heat the bathroom 1.

  The mist nozzle head 3 is connected to a water supply path 63 for mist connected to a water pipe. A liquid heat exchanger 61 is provided in the middle of the mist water supply path 63, and the mist water supplied to the mist water supply path 63 is heated by the liquid heat exchanger 61 to enter the bathroom 1 from the mist nozzle head 3. Sprayed.

  The heat source unit 4 includes a circulation pump 41 for circulating and supplying the heat medium that has become high-temperature water to the mist unit 6 and the bathroom heater 2 via the heat medium circulation path 5, and a point-extinguishing control and circulation pump 41 for the combustion burner. And a heat source machine controller 42 that performs drive control of the above.

  The heat medium circulation path 5 connected to the heat source unit 4 is connected to the mist heat medium circulation path 51 passing through the liquid heat exchanger 61 in the mist unit 6 and the heating heat exchanger 21 of the bathroom heater 2. It branches to the heating medium circulation path 52 for heating, and merges after passing through the mist unit 6 and the bathroom heater 2. The heating medium circulation path 52 is provided with an on-off valve 71 that is a thermal valve, and the supply of the heat medium to the bathroom heater 2 is shut off when the on-off valve 71 is closed. A flow control valve 72 capable of adjusting the flow rate of the heat medium is provided in the heat medium circulation path 51 for mist, and the supply of the heat medium to the liquid-liquid heat exchanger 61 is shut off when the flow control valve 72 is closed. Is done. The heating heat medium circulation path 52 is provided with a heat medium temperature sensor (heat medium temperature detecting means) 81 for detecting the temperature of the heat medium flowing through the heating medium circulation path 52. The heat medium temperature sensor 81 is provided between the liquid heat exchanger 61 and the on-off valve 71.

  The liquid heat exchanger 61 is configured such that a part of the mist heat medium circulation path 51 in which the heat medium flows and a part of the mist water supply path 63 in which the mist water flows are integrally adjacent to each other via the partition wall 62. Has been. Then, the heat medium heated by the heat source device 4 is supplied to the liquid-liquid heat exchanger 61 via the mist heat medium circulation path 51, and water supplied to the mist nozzle head 3 is supplied to the liquid medium heat exchanger 61 by the heat medium. So that it can be heated.

  A water supply valve 73 is provided in the mist water supply path 63 on the upstream side of the liquid heat exchanger 61, and a mist valve 74 is provided in the mist water supply path 63 on the downstream side of the liquid heat exchanger 61. Water supply to the liquid heat exchanger 61 is shut off when the water supply valve 73 is closed, and water supply to the mist nozzle head 3 is shut off when the mist valve 74 is closed. Further, a mist water temperature sensor (mist water temperature detecting means) for detecting the temperature of mist water flowing out from the liquid heat exchanger 61 is provided in the mist water supply path 63 between the liquid heat exchanger 61 and the mist valve 74. ) 82 is provided, a drainage channel 64 is branched and connected from a water supply channel 63 for mist between the arrangement portion of the water temperature sensor 82 for mist and the mist valve 74, and a drainage valve 75 is interposed in the drainage channel 64.

  Detection signals from the heat medium temperature sensor 81 and the mist water temperature sensor 82 are input to a mist unit controller (control unit) 65 provided in the mist unit 6, and the mist unit controller 65 provides an on-off valve 71 and a flow control valve 72. The water supply valve 73, the mist valve 74, and the drain valve 75 are controlled. The mist unit controller 65 is communicably connected to the heat source device controller 42 of the heat source device 4. A mist operation control is performed by the mist unit controller 65 when a remote controller (not shown) is communicably connected to the mist unit controller 65 and a mist switch provided on the remote controller is turned on.

  In the mist operation control, first, the mist unit controller 65 sends an operation command to the heat source unit controller 42 of the heat source unit 4 to operate the heat source unit 4 and opens the on-off valve 71 and the flow rate control valve 72 to open the heat source unit 4. The heat medium heated in step S is supplied to the heating heat exchanger 21 via the heating medium circulation path 52 and supplied to the liquid heat exchanger 61 via the mist heat medium circulation path 51. And when the temperature detected by the heat medium temperature sensor 81 rises to a predetermined temperature, the circulation fan 22 of the bathroom heater 2 is rotated to start heating. Next, the interior of the bathroom 1 rises to a constant temperature by this heating, and the water supply valve 73 and the mist valve 74 are opened when the temperature detected by the mist water temperature sensor 82 rises to a predetermined preheating completion temperature. Thereby, the hot water heated by the liquid heat exchanger 61 is supplied to the mist nozzle head 3, and the mist operation in which the hot water is sprayed from the mist nozzle head 3 is started. During the mist operation, temperature control for controlling the flow rate of the heat medium is performed by the flow rate control valve 72 so that the temperature detected by the mist water temperature sensor 82 is maintained at a predetermined set temperature. When the mist operation is stopped, the flow control valve 72 is closed to stop the supply of the heat medium to the liquid heat exchanger 61, and the mist valve 74 and the water supply valve 73 are closed to heat the liquid. Water supply to the exchanger 61 is stopped.

  By the way, when the mist sauna device is used for a long period of time, a hole may be formed in the partition wall 62 due to corrosion or the like in the liquid heat exchanger 61, thereby causing a leak between the heat medium and the mist water. Therefore, the mist unit controller 65 also has a function of automatically determining whether or not a leak has occurred in the liquid heat exchanger 61. When it is determined that a leak has occurred, the mist sauna device is compulsory together with a predetermined alarm process for the user. The operation stop process is executed.

  In the leakage determination control operation, it is first determined whether or not the mist operation has been stopped with reference to the leakage determination flow of FIG. 2 (S1). When the mist operation is stopped, the combustion burner is extinguished and an OFF signal for stopping the circulation pump 41 is transmitted to the heat source controller 42 (S2).

  Further, the on-off valve 71 is opened, and the temperature of the heat medium when the mist operation is stopped is detected by the heat medium temperature sensor 81 (S3). The detected temperature at this time is set as the initial temperature T0 of the heat medium, and the mist unit controller 65 Stored in a memory (not shown). At this time, even if the OFF signal is transmitted to the heat source device controller 42, the circulation pump 41 operates for a while, so that the on-off valve 71 is closed, so that the initial temperature T0 of the heat medium when the mist operation is stopped is It is reliably detected.

  Further, the mist valve 74 is closed, the drain valve 75 is opened, and the flow control valve 72 is closed (S4). Thereby, the hot water for high temperature mist in the water supply path 63 for mist of the liquid heat exchanger 61 is drained from the drainage channel 64, and is replaced with normal temperature mist water.

  Next, it is determined whether or not a first predetermined time t1 (for example, 180 seconds) has elapsed since the transmission of the OFF signal (S5). When the first predetermined time t1 has elapsed, the water supply valve 73 and the drain valve 75 are turned on. The valve is closed (S6). The first predetermined time t1 is set as a drainage time until the high temperature mist water in the mist water supply path 63 in the liquid heat exchanger 61 is drained and filled with room temperature mist water. In addition, the first predetermined time t1 is that the circulation pump 41 has been coasting for a while even if an OFF signal is transmitted to the heat source device controller 42, and it takes a certain time for the circulation pump 41 to completely stop. It is also a waiting time until 41 completely stops. Accordingly, in the present embodiment, the first predetermined time t1 is set to 180 seconds, but can be appropriately set according to the model or the like.

  Next, from when the OFF signal is transmitted until a second predetermined time t2 (for example, 300 seconds) elapses (S8), from the initial temperature T0 of the detected temperature T1 of the heat medium by the heat medium temperature sensor 81. It is determined whether or not the decrease temperature has become equal to or higher than a reference temperature ΔT (for example, 35 ° C.) (S7). If the temperature drop during this time is lower than the reference temperature ΔT (Yes in S7, Yes in S8), it is determined that the temperature is reduced due to natural heat dissipation, and it is determined that no leakage occurs (S9). Then, the on-off valve 71 is closed (S10), and the leak determination is terminated.

  On the other hand, if the temperature difference between the detected temperature T1 and the initial temperature T0 is equal to or higher than the reference temperature ΔT before the second predetermined time t2 elapses (No in S7), the temperature drop due to natural heat dissipation is reduced. It is determined that the leak has been exceeded, and it is determined that a leak has occurred (S11). In this case, for example, a failure lamp blinks as an error display (S12) on the remote controller or the like. Then, the on-off valve 71 is closed (S13), and the leak determination is terminated. If it is determined that there is a leak, subsequent mist operation is prohibited.

  Here, during the leak determination, the flow control valve 72 on the one side via the liquid-liquid heat exchanger 61 in the heat medium circulation path 5 is closed, and the opening / closing valve 71 on the opposite side via the liquid-liquid heat exchanger 61 is closed. Since the valve is opened, the heat medium of the liquid heat exchanger 61 is likely to flow toward the on-off valve 71 provided with the heat medium temperature sensor 81 of the heating medium circulation path 52. Therefore, when a leak has occurred in the liquid heat exchanger 61, the normal temperature mist water that has flowed into the mist heat medium circulation passage 51 easily flows to the heat medium temperature sensor 81 side. Detection sensitivity is improved.

  The second predetermined time t2 is set as a time when the heat medium temperature sensor 81 detects that the high-temperature heat medium is cooled more than natural heat dissipation due to leakage in the liquid-to-liquid heat exchanger 61, The reference temperature ΔT is set as a temperature range in which a high-temperature heat medium exceeds a temperature drop range due to natural heat dissipation within a certain time. Accordingly, the second predetermined time t2 and the reference temperature ΔT can be appropriately set according to the model and the like.

  The graph of FIG. 3 shows the temperature change of the heat medium (indicated by a solid line) when it is determined that there is no leak by the leak determination, and the temperature change of the heat medium (indicated by a dotted line) when it is determined that there is a leak. ing. If a leak occurs in the liquid heat exchanger 61, normal temperature mist water is mixed into the mist heat medium circuit 51 due to internal leakage, so that the temperature of the heat medium is compared with that in a normal state due to the heat effect of the mixed mist water. However, the temperature drops quickly, and the temperature drops more rapidly than the degree of temperature drop due to natural heat dissipation. As shown in FIG. 3, this means that the temperature change of the heat medium when it is determined that there is a leak is 300 from 180 seconds after the OFF signal is transmitted to the heat source controller 42 as compared with the case where there is no leak. It is also clear from the fact that the degree of temperature decrease after 2 seconds is increased.

  In addition, as an error display when it is determined that there is a leak, a warning lamp installed on the wall surface of the bathroom 1 may be used, and this warning lamp may be blinked and displayed on the display surface using a remote controller. May be used to display a warning, a blinking warning light, or the like. Further, an alarm buzzer installed in the bathroom 1 may be sounded, or an alarm based on voice guidance may be output using a similarly installed speaker.

  According to the leak determination process described above, when a leak occurs, normal temperature mist water is allowed to flow into the high-temperature heat medium at an early stage after the mist operation control is completed. The temperature is lowered, and it is possible to reliably determine whether or not a leak has occurred in a short time. Furthermore, since the leak determination is performed using the high-temperature residual heat of the heat medium at the end of the mist operation and the mist water at normal temperature, it is necessary to perform the combustion operation of the heat source unit 4 only for the leak determination. There is no wasted combustion energy.

  Further, as in the prior art, when the water supply valve 73 of the water supply path 63 for mist is kept open without draining high-temperature water for mist during the leak determination, a leak is generated in the liquid heat exchanger 61. If this occurs, there is a problem that leak detection is slow and a large amount of water for mist flows into the heat medium circulation path 5 so that the concentration of the antifreeze liquid as the heat medium becomes very thin. On the other hand, in the mist sauna device of the present embodiment, the high temperature mist water in the mist water supply path 63 is drained and replaced with room temperature mist water, and then the water supply valve 73 is closed and the mist heat medium circulation path. Since the temperature change of the heat medium in 51 is detected, a large temperature change can be generated with a small amount of leakage, so that dilution of the antifreeze liquid is suppressed.

In addition, this invention is not limited to the said embodiment, A various change is possible.
In the above embodiment, when the OFF signal is transmitted, the water for mist is started to drain and the water for mist is also drained until the circulation pump 41 is completely stopped (during inertial rotation) (S2 to S6). After a predetermined time sufficient to completely stop the circulation pump 41, the water supply valve 73 and the drain valve 75 are opened to drain the mist water, and the mist water temperature sensor 82 sets the temperature of the mist water to a predetermined temperature ( When the temperature drops to room temperature, the water supply valve 73 and the drain valve 75 may be closed to stop the drainage. Thereby, heat exchange heating of drained mist water is prevented, the amount of drainage can be reduced, and the amount of water used for leak determination can be reduced.

  Further, the mist nozzle head 3 and the bathroom heater 2 are classified into a ceiling installation type that fits into the ceiling of the bathroom 1 and a wall-mounted installation type that is attached to the side wall of the bathroom 1. The head 3 may be provided in the bathroom heater 2. Further, the mist generator may be used separately from the bathroom heater.

DESCRIPTION OF SYMBOLS 1 Bathroom 2 Bathroom heater 3 Mist nozzle head 4 Heat source machine 5 Heat medium circulation path 6 Mist unit 41 Circulation pump 42 Heat source machine controller 51 Heat medium circulation path 52 Heating heat medium circulation path 61 Liquid heat exchanger 62 Bulkhead 63 Mist supply channel 64 Drain channel 65 Mist unit controller (control unit)
71 On-off valve 72 Flow control valve 73 Water supply valve 74 Mist valve 75 Drain valve 81 Heat medium temperature sensor (heat medium temperature detection means)
82 Mist water temperature sensor (mist water temperature detection means)

Claims (2)

A part of the heat medium circulation path that circulates and supplies the hot water heated by the heat source machine by driving the circulation pump and a part of the mist water supply path that supplies the mist water to the mist nozzle head are adjacent to each other, and the heat medium circulation In a mist generating apparatus comprising a liquid-to-liquid heat exchanger that heats mist water flowing in a mist water supply path using a heat medium flowing in the path,
The heating medium circulation path is branched into a mist heating medium circulation path connected to the liquid heat exchanger and a heating heating medium circulation path connected to the heating heat exchanger,
A heating medium temperature detecting means for detecting the temperature of the heating medium in the heating medium circulation path provided in the heating medium circulation path;
An on-off valve provided in the heating heat medium circuit, and shuts off the supply of the heat medium to the heating heat exchanger by closing the valve;
A flow rate control valve that is provided in the mist heat medium circulation path and shuts off the supply of the heat medium to the liquid-liquid heat exchanger by closing the valve;
A water supply valve that is provided in a water supply passage for mist upstream of the liquid heat exchanger, and shuts off the water supply to the liquid heat exchanger when the valve is closed;
A mist valve that is provided in a mist water supply channel downstream of the liquid heat exchanger and shuts off the water supply to the mist nozzle head when closed;
A drainage valve provided in a drainage channel branched from the water supply channel for mist downstream from the liquid heat exchanger, and draining the water supply channel for mist by opening the valve;
A control unit for controlling opening and closing of the on- off valve, flow control valve, water supply valve, mist valve and drain valve,
The heating medium temperature detecting means in the heating medium circulating path connected to the mist heating medium circulating path on the opposite side from the position where the flow rate control valve is provided in the heating medium circulating path for the mist. And the on-off valve,
After the mist operation control is completed, the control unit closes the flow rate control valve and the mist valve, and after draining the hot water in the water supply path for mist in the liquid heat exchanger in a state where the water supply valve and the drain valve are opened, The heating heat detected by the heat medium temperature detecting means is closed while the water supply valve and the drain valve are closed and the flow rate control valve is closed while the on-off valve is open while the leak judgment of the liquid heat exchanger is being performed. A mist generator having a control configuration for determining whether or not a leak occurs in a liquid-to-liquid heat exchanger based on a temperature drop of a heat medium in a medium circulation path . The mist generating apparatus according to claim 1 ,
Mist water temperature detecting means for detecting the temperature of the mist water flowing out from the liquid heat exchanger is provided in the water supply channel or drainage channel for mist,
The control unit opens the water supply valve and the drain valve when a sufficient time has elapsed to finish the mist operation control and the circulation pump completely stops, and the mist water temperature is detected based on the detection result of the mist water temperature detecting means. A mist generator having a control configuration that closes the water supply valve and the drain valve when the temperature of the water drops to a predetermined temperature.

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