JP2000304287A - Air conditioner for bathroom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner for a bathroom which can keep the temperature within a bathroom roughly constant, and hardly allow cold wind to blow upon a bather. SOLUTION: When the room temperature detected by a room temperature detection sensor 10 exceeds the thermal valve off temperature, a thermal valve 4 is closed, and when the room temperature goes down under the thermal valve on temperature, the thermal valve 4 is opened. When the temperature of the heat exchanger detected by a heat exchanger temperature sensor 6 is under a specified temperature, a circulation fan 13 is stopped to prevent the blowout of cold wind, and as the temperature of the heat exchanger goes high, the number of revolutions of the fan is raised. Moreover, when the temperature of the heat exchanger is lowering, the number of revolutions of the fan is lowered to a number less when temperature of the heat exchanger is rising. Furthermore, in case that the thermal valve is close, it sends air with a small number of revolutions from the circulation fan 13 so that it can detect the room temperature accurately while suppressing the blowout of cold wind.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bathroom air conditioner, and more particularly to a bathroom air conditioner using hot water.

[0002]

2. Description of the Related Art Conventionally, bathroom dryers have been used. This is such that the bathroom can be diverted to a drying room, and the clothes can be dried quickly by blowing warm air on clothes or the like suspended in the bathroom. This bathroom dryer has an air conditioning function for heating the bathroom in addition to a drying function, so that the bathroom can be heated before or during bathing.

[0003]

However, in a bathroom air conditioner typified by a conventional bathroom dryer, a warm air can be blown out to heat the bathroom. For example, it is not possible to input a set temperature from, for example, control the room temperature in the bathroom according to the set temperature.

[0004] Therefore, it is not only impossible to adjust the temperature of the bathroom according to the season or to adjust the temperature of the bathroom according to the demand of the bather, but also it is difficult to keep the temperature of the bathroom substantially constant.

[0005] In a heating operation using a conventional bathroom dryer, when the temperature of the heat exchanger is low, such as at the start of heating, cool air is blown. Since the bather is naked, the bather is very sensitive to the cold wind, and there is a problem that when the cold wind hits, the bather feels a cold wind and becomes cold.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and has as its object the purpose of keeping the temperature in the bathroom almost constant, and furthermore, it is hard for the bather to blow cold air. An object of the present invention is to provide a bathroom air conditioner.

[0007]

According to the first aspect of the present invention, there is provided a bathroom air conditioner, comprising: a heat exchanger for exchanging heat between a heat medium circulating in the air and air; and a heat medium flowing through the heat exchanger. A valve for controlling a flow rate, a blower fan for blowing air exchanged by the heat exchanger into a room, a heat exchanger temperature sensor for detecting a temperature of the heat exchanger, and a room temperature for detecting a room temperature A detection sensor, means for controlling the valve based on the detection value of the room temperature detection sensor, and means for controlling the rotation speed of the blower fan based on the detection value of the heat exchanger temperature sensor. It is characterized by.
Here, the valve may be a valve that controls the flow rate discontinuously (for example, an open / close type) or a valve that continuously controls the flow rate (for example, a flow control type).

In the bathroom air conditioner according to the first aspect, since the valve is controlled based on the detection value of the room temperature detection sensor, the valve can be controlled so that the room temperature is substantially stabilized. The temperature in the bathroom can be kept substantially uniform. Further, since the rotation speed of the blower fan is controlled based on the detection value of the heat exchanger temperature sensor, when the heat exchanger temperature is low, the rotation speed of the blower fan is reduced to weaken the blower. Thereby, it is possible to suppress the cold wind from directly hitting the bather.

According to a second aspect of the present invention, in the bathroom air conditioner according to the first aspect, the means for controlling the number of revolutions of the blower fan includes a detection value of the heat exchanger temperature sensor. Further, the fan speed is controlled based on the control state of the valve.

In the bathroom air conditioner of the present invention, the fan rotation speed is controlled based on the detected value of the heat exchanger temperature sensor and the control state of the valve. Depending on whether or not the medium is flowing, the flow rate thereof, or the like, the fan rotation speed with respect to the heat exchanger temperature can be varied, and the fan rotation speed can be optimally controlled. For example, when the valve is closed or the flow rate is low during the heating operation, by reducing the fan rotation speed with respect to the heat exchanger temperature, the indoor temperature is accurately detected while suppressing the blowing of the cool air, etc. Room temperature control can be performed accurately.

A third aspect of the present invention provides a bathroom air conditioner which operates in a direction to close the valve when the detection value of the room temperature detection sensor in the bathroom air conditioner of the first or second aspect reaches a set temperature, Then, when the detected value of the heat exchanger temperature sensor falls below a predetermined temperature, the blower fan is slightly operated.

According to the third aspect of the present invention, even when the room temperature reaches the set temperature and the valve is operated in the direction to close the valve, the detected value of the heat exchange temperature sensor is lower than the predetermined temperature. Since the blower fan is sometimes operated slightly, the indoor air can be circulated to accurately detect the indoor temperature. In addition, since the blower fan is operated slightly, it is possible to prevent the cold air from being strongly blown out and giving the bather a feeling of cool air.

According to a fourth aspect of the present invention, in the bathroom air conditioner according to the third aspect, the room temperature detection sensor is disposed near an intake port that sucks air in the bathroom, and Detects the temperature of the bathroom even during weak driving,
When the room temperature drops to a predetermined temperature, the valve is operated again in the opening direction to restart the hot water heating by the heat exchanger.

According to a fourth aspect of the present invention, in the bathroom air conditioner, the room temperature is detected by the room temperature detection sensor even when the valve is operated in the closing direction and the blowing fan is slightly operated. Therefore, when the room temperature drops to the predetermined temperature, the valve can be operated in the direction to open the valve again to raise the room temperature. In particular, since the room temperature detection sensor is provided near the air inlet for taking in the air in the bathroom, the room temperature can be accurately detected even when the blower fan is slightly operated.

According to a fifth aspect of the present invention, in the bathroom air conditioner of the first, second, third, or fourth aspect, when the room temperature detecting sensor detects an abnormal temperature rise, the air conditioning operation is performed. It is characterized in that it is stopped.

In the bathroom air conditioner according to the present invention, when the room temperature detection sensor detects an abnormal rise in temperature, the air conditioning operation is stopped. Can prevent and enhance the safety of the bathroom air conditioner. In particular, it is often difficult to immediately take action even if an abnormality is noticed in the bathroom, so that automatically stopping the air-conditioning operation is highly effective in improving safety.

A bathroom air conditioner according to claim 6 is the bathroom air conditioner according to claim 1, 2, 3, 4 or 5.
After the air conditioning operation is stopped, the blower fan is operated until the heat exchanger temperature falls to a predetermined temperature.

In the bathroom air conditioner according to the sixth aspect, after the air conditioning operation is stopped, the blower fan is operated until the temperature of the heat exchanger falls to a predetermined temperature.
After the air-conditioning operation is stopped, the hot air accumulated inside the bathroom air conditioner is expelled, and the temperature of the bathroom air conditioner can be reduced. Therefore, it is possible to prevent the resin case of the bathroom air conditioner and other resin parts or the bonded portion of the components from being damaged, and to extend the useful life of the bathroom air conditioner.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Structure of Bathroom Air Conditioner) FIG. 1 is a schematic diagram showing the internal structure of a warm water circulation type bathroom air conditioner 1 installed on a wall surface or a ceiling of a bathroom. A circulation pipe 2 for circulating high-temperature hot water is provided in the bathroom air conditioner 1, and a heat exchanger (radiator) 3 having radiating fins is provided on a part of the circulation pipe 2. It is configured. The circulation pipe 2 is provided with a thermal valve 4. A heat source device 5 such as a water heater is connected to the circulation pipe 2, and high-temperature hot water is supplied to the circulation pipe 2 by the heat source device 5. 6
Is a heat exchanger temperature sensor for detecting the temperature of the heat exchanger 3 and is attached to the heat exchanger 3. The case 7 of the bathroom air conditioner 1 faces the heat exchanger 3 and has an intake port 8.
Is opened, and a filter 9 is provided between the intake port 8 and the heat exchanger 3. Reference numeral 10 denotes a room temperature detection sensor, which is provided at a position distant from the heat exchanger 3 to some extent and near the intake port 8. Further, a hot air outlet 11 having a louver is provided on a side of the case 7 opposite to the air inlet 8, and a rotary drive by a motor 12 is provided between the heat exchanger 3 and the hot air outlet 11. A circulation fan (blowing fan) 13 such as a flow-through fan is provided.

The motor 1 is located beside the circulation fan 13.
A ventilation fan 15 such as a sirocco fan, which is rotationally driven by the fan 4, is provided. Air (humidity) sucked into the case 7 from the intake port 8 is exhausted to the outside through the exhaust port 16 by the ventilation fan 15.

The bathroom air conditioner 1 is a remote controller 1
7, the operation can be switched between the drying operation and the heating operation by operating the remote controller 17, and the strength or setting temperature of the heating operation can be input from the remote controller 17.

The bathroom air conditioner 1 has a built-in controller 18.
Is controlled by the Controller 1
8 performs a continuous operation for a time set by a timer without performing room temperature control during the drying operation. On the other hand, during the heating operation, the room temperature detecting sensor 10 detects the room temperature in the vicinity of the bathroom air conditioner 1, controls the opening and closing of the thermal valve 4 based on the detected room temperature, and further detects the heat detected by the heat exchanger temperature sensor 6. Room temperature control is performed by controlling the rotation speed of the circulation fan 13 in accordance with the exchanger temperature and the open / close state of the thermal valve 4.

(Control Method of Thermal Valve) First, control of the thermal valve 4 will be described. The thermal valve 4 includes a room temperature detection sensor 10
Opening / closing is controlled by the detected temperature. From the remote controller 17, the strength of the heating operation by the bathroom air conditioner 1,
For example, if you can set "High", "Medium", and "Low" (you may be able to set more finely), you can select "High", "Medium", or "Low" Accordingly, the thermal valve 4 is opened at a predetermined room temperature (set temperature) (hereinafter referred to as ON), and the thermal valve 4 is closed at a predetermined room temperature (hereinafter referred to as OFF). Table 1 shows the relationship between the strength of the heating operation and the room temperature at which the thermal valve 4 is turned on and off.

[0024]

[Table 1]

As a result, the temperature in the bathroom is maintained at a set temperature of about 41 to 42 ° C. when the heating operation is performed at “high”, and about 38 ° C. when the heating operation is performed at “medium”. ~ 39
The set temperature is maintained at a set temperature of about 35 to 36 ° C. during the “low” heating operation.

(Circulation Fan Control Method) The circulation fan 13 is set to “strong” when the thermal valve 4 is turned on, as described later.
The mode can be switched between "medium" and "weak", and when the thermal valve 4 is off, the mode can be switched between "weak" and "slightly weak". Here, the fan rotation speed when the air blowing level of the circulation fan 13 is “strong”, “medium”, “weak”, and “weak” is, for example, as shown in Table 2 below.

[0027]

[Table 2]

FIG. 2 is a diagram showing the relationship between the heat exchanger temperature and the air blowing level of the circulation fan 13 when the thermal valve 4 is turned on. This figure shows that when the heat exchanger temperature rises, the air blowing level of the circulation fan 13 is controlled to be less than T2: stop T2 or more and less than T4: weak T4 or more and less than T6: medium T6 or more: strong Indicates that the airflow level of the circulation fan 13 is controlled to be T5 or more: strong T3 or more and less than T5: medium T1 or more and less than T3: weak and less than T1: stop. Here, the temperatures T1 to T6 are, for example, T1 ° C. = 43 ° C., T2 ° C.
= 45 ° C, T3 = 47 ° C, T4 = 49 ° C, T5 = 51
° C, T6 = 53 ° C.

When the temperature of the heat exchanger rises (for example, at the start of the heating operation), the temperature of the hot water circulating in the heat exchanger 3 (heat exchanger temperature) is low, and when it is lower than T2, the circulation fan 13
To stop. This is to operate the circulation fan 13 when the temperature of the hot water is low to blow out the cool air so that the bather does not feel a cool air feeling. At T2 and above, the operation of the circulation fan 13 is started, and the fan speed of the circulation fan 13 is increased stepwise. This is because the circulation fan 13 is weakly operated while the temperature of the hot water is low to make it difficult for cold air to reach the bather, and at the same time, the circulation fan 13 is strongly operated as the temperature of the hot water is increased to quickly bring the room temperature close to the set temperature. In order to

When the heat valve 4 is turned on and the temperature of the heat exchanger falls (for example, the heat valve 4 is opened and hot water is circulated, the capacity of the heat source unit 5 is temporarily reduced. (When the heat exchanger temperature is lowered), the fan rotation speed of the circulation fan 13 is set to be slightly smaller (1/1/2) than when the heat exchanger temperature is increased.
(2 levels) Drive up. In this state, the process waits until the heat exchanger temperature rises again. When the temperature of the heat exchanger further decreases and becomes lower than T1, the circulation fan 13 is stopped to prevent blowing of cool air.

On the other hand, when the thermal valve 4 is off,
The circulation fan 13 is controlled using a blowing level different from that when the thermal valve 4 is on. That is, FIG.
FIG. 6 is a diagram showing a relationship between the heat exchanger temperature and the air blowing level of the circulation fan 13 when is turned off. This figure shows that when the temperature of the heat exchanger rises, the ventilation level of the circulation fan 13 is controlled to be less than T8: slightly weaker than T8: weaker, and when the temperature of the heat exchanger falls, the ventilation level of the circulation fan 13 is reduced to T7. Above: weak T7: controlled to be weak. Here, the temperatures T7 and T8 are, for example, T7 = 51 ° C. and T8 =
53 ° C.

In the bathroom air conditioner 1 of the present invention, when the room temperature reaches the set temperature (heat valve off temperature), the heat valve 4 is immediately turned on to prevent the room temperature from rising too much. At the same time, the air blowing level of the circulation fan 13 is switched to the level shown in FIG.

When the indoor temperature reaches the set temperature and the hot-air valve 4 is turned off, a strong wind is blown out by the circulating fan 13 so that the temperature of the heat exchanger drops rapidly, and the cold air is bathed. Will be blown out toward the person. On the other hand, when the ventilation is stopped, the air in the bathroom does not circulate, so that the room temperature cannot be accurately detected by the room temperature detection sensor 10, and the room temperature may continue to fall. For that,
When the heat valve 4 is turned off, the circulation fan 13 is switched to the air blowing level as shown in FIG. 3 and the circulation fan 13 is weakly operated. Is weakened, and the indoor air is circulated while weakening the blowing of the cool air, so that the indoor temperature can be accurately detected. In particular, at this time, the room temperature detection sensor 10
Is provided in the vicinity of the air inlet 8 for sucking the air in the bathroom, so that the temperature of the bathroom can be detected more accurately. When the room temperature drops and the thermal valve 4 is turned on again, the control of the circulation fan 13 is switched again to the air blowing level as shown in FIG.

(Excessive Heat Prevention Control) In addition, during the heating operation, the room temperature exceeds the set temperature (heat valve off temperature) and abnormally rises, and exceeds the overheat detection temperature (>> heat valve off temperature). In this case (shown by a broken line in FIG. 4), the controller 18 forcibly stops the operation of the heat source unit 5 and prevents an abnormal rise in room temperature. Thereafter, an alarm buzzer may be sounded to prompt an inspection, or the heat source device 5 may be operated again when the room temperature falls below the thermal valve ON temperature to continue the heating operation. .

(Post-purge) When the heating operation of the bathroom air conditioner 1 is stopped, the heat source unit 5 stops the hot water supply operation,
The thermal valve 4 is also closed. After the operation is stopped, the circulation fan 13 performs the post-purge operation at a lower rotation speed than usual while the heat exchanger temperature is higher than a predetermined temperature (for example, 51 ° C.). That is, immediately after the heating operation is stopped, the circulation fan 1
If 3 is stopped, there is a possibility that the resin case 7, the resin joint of the appliance, the moisture-proof coating film of the circuit board, and the like may be damaged. For this reason, even after the heating operation is stopped, the circulation fan 13 is operated for a certain period of time to radiate heat inside the bathroom air conditioner 1 and prevent the bathroom air conditioner 1 from being damaged.

(Cleaning operation) The ventilation fan 1
5 may be operated for 15 minutes or more to exhaust the moisture in the bathroom to the outside, and then the circulation fan 13 may be operated for about 15 minutes to dry the inside of the bathroom air conditioner 1.

(Specific operation example) Since the bathroom air conditioner 1 employs the above-described control method, the operation state from the start to the end of the operation is represented by, for example, FIG. It is. In FIG. 4, (a) shows a change in the indoor temperature, (b) shows ON (lighting) and OFF (light off) of an operation lamp (operation display LED) provided in the bathroom air conditioner 1, (C) shows ON (open) and OFF (closed) of the thermal valve 4, (d) shows ON (in the state of blowing by the above-mentioned control method) and OFF (stop) of the circulation fan 13,
(E) shows ON (operation) and OFF (operation stop) of the heat source device 5.

When an operation command is input from the remote controller 17 to the controller 18 at time t1, the bathroom air conditioner 1 starts a heating operation and turns on an operation lamp.
On the other hand, the heat source device 5 is operated by a signal from the controller 18. At the same time, the thermal valve 4 provided in the circulation pipe 2 is opened, and waits until hot water is supplied from the heat source unit 5.

When the heating operation is started in this manner, the circulation fan 13 is operated by the air blowing level as shown in FIG. 2 until the room temperature reaches the set temperature (the thermal valve off temperature) and the thermal valve 4 is closed. Controlled. That is, when the heat exchanger temperature is lower than T2, the circulation fan 13 is stopped,
The temperature of the heat exchanger becomes T due to the hot water supplied from the heat source unit 5.
When the temperature rises above 2, the circulation fan 13 is blown at a low level to prevent cold air and to detect room temperature. Further, the temperature of the heat exchanger rises, and when it becomes T4 or more, the circulation fan 13 blows at a medium level, and when it becomes T6 or more, the circulation fan 13 blows at a high level, and the room temperature reaches the set temperature (thermal valve off temperature). Strong blast is applied until.

When the detected value of the room temperature detection sensor 10 reaches the set temperature (thermal valve off temperature) at time t2, the thermal valve 4 is closed. When the thermal valve 4 is closed, the circulation fan 13 is controlled by the air blowing level as shown in FIG. That is, when the thermal valve 4 is closed, the circulation fan 13 is weakened to prevent excessive rise and to suppress blowing of cool air. Further, when the room temperature decreases, the circulation fan 13 is slightly operated to suppress the feeling of cool air and detect the temperature in the bathroom.

When the room temperature drops to the thermal valve ON temperature at time t3, the thermal valve 4 is opened again and the circulation fan 13
Is switched to the air blowing level of FIG. 2 again.

In the bathroom air conditioner 1 of the present invention, the thermal valve 4 repeatedly turns on and off between the thermal valve on temperature and the thermal valve off temperature as described above. By switching the control of the circulation fan 13 between the air blowing level shown in FIG. 2 and the air blowing level shown in FIG. 3, the temperature in the bathroom is maintained near the set temperature and the blowing of the cool air is prevented.

In the above-described embodiment, the thermal valve 4 is provided in the circulation pipe 2 so that the fan rotation speed control level of the circulation fan 13 is different depending on whether the thermal valve 4 is on or off. Is provided with a flow control valve in the circulation pipe 2 so that the flow rate of the hot water flowing through the heat exchanger 3 can be controlled. According to the flow rate of the hot water flowing through the heat exchanger 3, the fan rotation speed of the circulation fan 13 with respect to the heat exchanger temperature The levels may be different.

[0044]

According to the bathroom air conditioner of the present invention, since the valve is controlled based on the detection value of the room temperature detection sensor, the valve can be controlled so that the room temperature is almost stabilized. In addition, the temperature in the bathroom can be kept substantially uniform. Further, since the rotation speed of the blower fan is controlled based on the detection value of the heat exchanger temperature sensor, when the heat exchanger temperature is low, the rotation speed of the blower fan is reduced to weaken the blower. Thereby, it is possible to suppress the cold wind from directly hitting the bather.

According to the bathroom air conditioner of the present invention, the fan rotation speed is controlled based on the detection value of the heat exchanger temperature sensor and the control state of the valve. Depending on whether the heat medium is flowing, the flow rate thereof, or the like, the fan rotation speed with respect to the heat exchanger temperature can be varied, and the fan rotation speed can be optimally controlled. For example, when the valve is closed or the flow rate is low during the heating operation, by reducing the fan rotation speed with respect to the heat exchanger temperature, the indoor temperature is accurately detected while suppressing the blowing of the cool air, etc. Room temperature control can be performed accurately.

According to the bathroom air conditioner of the third aspect,
When the room temperature reaches the set temperature and the valve is operated in the direction to close, the blower fan is operated slightly when the value detected by the heat exchange temperature sensor falls below a predetermined temperature. The room temperature can be accurately detected by circulating the air. In addition, since the blower fan is operated slightly, it is possible to prevent the cold air from being strongly blown out and giving the bather a feeling of cool air.

According to the bathroom air conditioner of the fourth aspect,
Since the room temperature is detected by the room temperature detection sensor even when the blower fan is operated in the direction in which the valve closes and the blowing fan is slightly operated, when the room temperature decreases to a predetermined temperature, the valve is closed again. Operate in the opening direction,
Room temperature can be raised. In particular, since the room temperature detection sensor is provided near the air intake that sucks the air in the bathroom,
The room temperature can be accurately detected even when the blower fan is slightly operated.

According to the bathroom air conditioner of the fifth aspect,
When the room temperature detection sensor detects an abnormal temperature rise, the air conditioning operation is stopped, so that runaway of the bathroom air conditioner can be prevented, and the safety of the bathroom air conditioner can be enhanced. In particular, it is often difficult to immediately take action even if an abnormality is noticed in the bathroom, so that automatically stopping the air-conditioning operation is highly effective in improving safety.

According to the bathroom air conditioner of the sixth aspect,
After the air-conditioning operation is stopped, the blower fan is operated while the heat exchanger temperature is higher than the predetermined temperature.Therefore, after the air-conditioning operation is stopped, the hot air accumulated in the bathroom air conditioner is expelled, and the bathroom air conditioner is stopped. The temperature can be lowered. Therefore, it is possible to prevent the resin case of the bathroom air conditioner and other resin parts or the bonded portion of the components from being damaged, and to extend the useful life of the bathroom air conditioner.

[Brief description of the drawings]

FIG. 1 is a schematic view showing the internal structure of a bathroom air conditioner according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a relationship between a heat exchanger temperature and a fan rotation speed control level of a circulation fan when a heat valve is on.

FIG. 3 is a diagram showing a relationship between a heat exchanger temperature and a fan rotation speed control level of a circulation fan when a heat valve is off.

FIG. 4 is an explanatory diagram showing the operation of each unit from the start to the end of operation of the bathroom air conditioner.

[Explanation of symbols]

 2 Circulation pipe 3 Heat exchanger 4 Heat valve 6 Heat exchanger temperature sensor 10 Room temperature detection sensor 11 Hot air outlet 17 Remote controller 18 Controller

Continuing on the front page (72) Inventor Yasunari Okuda 93 Edo-cho, Chuo-ku, Kobe-shi, Hyogo Pref. ) Inventor Shoji Doi 93 Edocho, Chuo-ku, Kobe City, Hyogo Prefecture Inside Noritz Co., Ltd. Tetsuya Niwa 4-1-2 Hirano-cho, Chuo-ku, Osaka-shi F-term in Osaka Gas Co., Ltd. (reference) 3L070 AA07 BB01 DD06 DE03 DF01 DF06 DG06 DG09 3L071 AA01 AB06 AC01 AE03 AF01 AG02 3L072 AA05 AB06 AC01 AE03 AF01 AG01 AC52 AC53 AC67 BA14 CA08 CB24 CB27 DA07 4L019 BA03

Claims (6)

[Claims] 1. A heat exchanger for exchanging heat between a heat medium circulating in the air and air, a valve for controlling a flow rate of the heat medium flowing through the heat exchanger, and air exchanged by the heat exchanger in the room. A fan for blowing air to the heat exchanger; a heat exchanger temperature sensor for detecting the temperature of the heat exchanger; a room temperature detection sensor for detecting room temperature; and controlling the valve based on a detection value of the room temperature detection sensor. A bathroom air conditioner comprising: means for controlling the number of rotations of the blower fan based on a value detected by the heat exchanger temperature sensor. 2. The means for controlling the number of revolutions of the blower fan controls the number of revolutions of the fan based on a value detected by the heat exchanger temperature sensor and a control state of the valve. The bathroom air conditioner according to claim 1. 3. When the detected value of the room temperature detecting sensor reaches a set temperature, the valve is operated in a direction to close the valve, and when the detected value of the heat exchanger temperature sensor falls below a predetermined temperature, The bathroom air conditioner according to claim 1 or 2, wherein the fan is operated slightly. 4. The room temperature detection sensor is disposed near an intake port for sucking air in the bathroom, detects the temperature of the bathroom even when the blowing fan is slightly operated, and when the room temperature decreases to a predetermined temperature, 4. The bathroom air conditioner according to claim 3, wherein the valve is operated in the direction to open the valve again to restart the hot water heating by the heat exchanger. 5. The bathroom air conditioner according to claim 1, wherein the air conditioning operation is stopped when the room temperature detection sensor detects an abnormal temperature rise. . 6. The air conditioner according to claim 1, wherein after the air conditioning operation is stopped, the blower fan is operated until the heat exchanger temperature falls to a predetermined temperature. Bathroom air conditioner.