Condensate water treatment system of refrigeration type range hood and control method

Abstract

The invention discloses a condensate water treatment system of a refrigeration type range hood and a control method. An inlet of a first three-way valve is communicated with a condensate water outlet, a first outlet of the first three-way valve is communicated with the water inlet end of a purified water inlet pipe, a second outlet of the first three-way valve is communicated with the water inlet end of a sewage inlet pipe, and an inlet of a second three-way valve is communicated with a condensate water return port; a first outlet of the second three-way valve is communicated with the water inlet end of a purified water return pipe, a second water outlet of the second three-way valve is communicated with the water inlet end of a sewage return pipe, and the water outlet end of the purified water inlet pipe and the water outlet end of the purified water return pipe are both communicated with the purified water area; and water in the water purification area is conveyed to the condenser through the water outlet pipe. According to the condensate water treatment system for the refrigeration type range hood, the evaporator and the condenser can be cleaned independently, cleaned sewage flows into the sewage area, overflows and can be directly discharged into the oil cup, the water pump cannot be blocked and damaged, and sewage cannot be accumulated in the water storage box.

Description

Technical Field

[0001] The invention relates to a refrigeration type range hood, and in particular to a condensed water processing system and a control method of the refrigeration type range hood. Background Art

[0002] Various refrigeration-type range hoods are disclosed in the prior art. An air conditioning component is added to the range hood platform, which can realize all the functions of the range hood and the function of the air conditioner. The air conditioning component includes an internal module and an external module, wherein the internal module includes an evaporator and an internal fan, and the external module includes a condenser and an external fan. Some refrigeration-type range hoods install the condenser of the air conditioning component in the smoke exhaust channel. The condenser will be contaminated by oil smoke and needs to be cleaned in time. If the cleaning is not timely, the heat exchange effect will be greatly reduced, thereby affecting the energy efficiency of the air conditioner and increasing energy consumption. In addition, when working in the refrigeration mode, the condenser also needs to be cooled by the smoke exhaust fan. Although some refrigeration-type range hoods install the condenser outside the smoke exhaust channel, after the condenser has been working for a long time, dirt will remain on the surface. In order to ensure the heat exchange effect, the condenser needs to be cleaned. In addition, since the refrigeration hood is installed in the kitchen fume environment, and the return air of the internal unit module usually adopts indoor return air, after long-term use, dust and oil will remain on the surface of the evaporator, and it also needs to be cleaned in time. For example, the Chinese utility model patent No. 202220040537.0 (authorized public number CN 217685714U) discloses "A water pump flow control system and air-conditioning range hood". When working in the air-conditioning mode (cooling mode), the condensed water condensed on the evaporator flows into the water receiving tray, and the condensed water in the water receiving tray flows into the water box through the water inlet pipe. Under the action of the water pump, the condensed water in the water box is transported to the liquid distributor through the water outlet pipe, and then flows from the liquid distributor to the surface of the condenser. On the one hand, the condenser is cooled, and its heat exchange effect is further improved, so as to realize the effective use of the condensed water. On the other hand, the condensed water is heated and evaporated by the condenser and discharged from the first exhaust channel. The condensed water that has not been evaporated flows into the water receiving box, and then flows back to the water box through the return pipe for repeated use. The air-conditioning range hood can only perform self-cleaning of the condenser alone, and the sewage after cleaning is not discharged separately, but accumulated in the water storage box. When the water pump is operated again, the sewage will block the water pump, causing damage to the water pump. In addition, the sewage accumulated in the water storage box will also cause odor. In summary, the condensate treatment system of the existing refrigeration range hood needs to be further improved. Summary of the invention

[0003] The first technical problem to be solved by the present invention is to provide a condensate treatment system for a refrigeration range hood capable of cleaning the evaporator and the condenser in view of the above-mentioned existing technical status.

[0004] The second technical problem to be solved by the present invention is to provide a control method for the above-mentioned condensate treatment system in view of the above-mentioned existing technical status.

[0005] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a condensate treatment system for a refrigeration-type range hood, comprising a compressor, an inner unit module, an outer unit module and a water storage box, the inner unit module comprising an inner unit housing, an evaporator and an inner unit fan, the outer unit module comprising an outer unit housing, a condenser and a heat dissipation fan, the compressor, the condenser and the evaporator are connected through a refrigerant pipeline, a condensate outlet is provided at the bottom of the inner unit housing, and a condensate return port is provided at the bottom of the outer unit housing, characterized in that: it also comprises a clean water inlet pipe, a sewage inlet pipe, a first three-way valve, a water outlet pipe, a clean water return pipe, a sewage return pipe and a second three-way valve, the inlet of the first three-way valve is connected to the refrigeration The condensate outlet is connected, the first outlet of the first three-way valve is connected to the water inlet end of the clean water inlet pipe, the second outlet of the first three-way valve is connected to the water inlet end of the sewage inlet pipe, the inlet of the second three-way valve is connected to the condensate return port, the first outlet of the second three-way valve is connected to the water inlet end of the clean water return pipe, the second outlet of the second three-way valve is connected to the water inlet end of the sewage return pipe, the water storage box is separated into a clean water area and a sewage area, the outlet ends of the clean water inlet pipe and the clean water return pipe are both connected to the clean water area, the outlet ends of the sewage inlet pipe and the sewage return pipe are both connected to the sewage area, and the water in the clean water area is transported to the condenser through the outlet pipe.

[0006] In order to avoid mixing of clean water and sewage, the clean water area and the sewage area are separated by a dam, and the sewage area is provided with an overflow outlet. The height of the dam is higher than the height of the overflow outlet, and the height of the dam is lower than the edge height of the water storage box.

[0007] In order to facilitate the overflow of water from the clean water area to flow to the sewage area, the depth of the clean water area is smaller than that of the sewage area.

[0008] In order to transport the condensed water in the clean water area to the condenser, a water pump is also included. The water in the clean water area is transported to the condenser through the water pump and the water outlet pipe.

[0009] In order to evenly distribute the condensed water on the condenser, a liquid distributor capable of distributing liquid to the condenser is installed on the top of the condenser, and the water outlet of the water outlet pipe is connected to the water inlet of the liquid distributor.

[0010] The indoor module and the outdoor module can be installed in a variety of ways. Preferably, the indoor module and the outdoor module are arranged adjacent to each other. Along the air flow direction, the indoor fan is arranged downstream of the evaporator, and the heat dissipation fan is arranged downstream of the condenser.

[0011] A control method for a condensate treatment system of a refrigeration range hood comprises the following steps:

[0012] S1, power on;

[0013] S2, start the refrigeration system;

[0014] S3, the first three-way valve opens the water purification channel;

[0015] S4, the evaporator produces condensed water;

[0016] S5, the condensed water flows into the clean water inlet pipe, and then flows into the clean water area of ​​the water storage box;

[0017] S6. Turn on the water pump to pump the condensed water in the water purification area to the condenser through the outlet pipe for evaporation and heat dissipation;

[0018] S7, the second three-way valve opens the clean water channel, and the condensed water that cannot be evaporated by the condenser flows back to the clean water area of ​​the water storage box through the clean water reflux pipe.

[0019] Preferably, the water overflowing from the clean water area flows over the dam into the sewage area, and then flows into the oil cup of the range hood through the overflow port. With this arrangement, if more and more condensed water cannot be processed, the water will flow over the dam, from the clean water area to the sewage area, and then flow into the oil cup through the overflow port.

[0020] The technical solution adopted by the present invention to solve the above second technical problem is that the control method of the condensate treatment system of the refrigeration type range hood comprises the following steps:

[0021] A1. Turn on the power.

[0022] A2. Turn on the evaporator self-cleaning;

[0023] A3, the first three-way valve opens the sewage channel;

[0024] A4. The fan of the indoor unit is turned off, and the evaporator starts to condense and defrost, and the evaporator is self-cleaned to produce cleaned sewage;

[0025] A5. The sewage after cleaning the evaporator flows into the sewage area of ​​the water storage box through the sewage inlet pipe, and then flows into the oil cup through the overflow port;

[0026] A6. Prompt the user to pour the oil cup.

[0027] In order to realize the self-cleaning of the condenser, the control method of the condensate treatment system of the refrigeration type range hood is provided with a liquid level sensor for detecting the water level of the water box installed in the water storage box. The control method comprises the following steps:

[0028] B1. Turn on the power;

[0029] B2. Turn on the condenser self-cleaning;

[0030] B3. Turn on the refrigeration system;

[0031] B4, the first three-way valve opens the water purification channel;

[0032] B5. The evaporator produces condensed water;

[0033] B6. The water flows into the clean water inlet pipe from the condenser and then flows to the clean water area of ​​the water storage box, and the water pump is turned off;

[0034] B7, the liquid level sensor detects whether the water level in the water box has reached the washable water level;

[0035] If the water level in the water box does not reach the washable water level, return to step B6;

[0036] If the water level in the water box reaches the washable level, proceed to step B8;

[0037] B8, the water pump starts pumping water;

[0038] B9. The water pump draws the water in the clean water area of ​​the water storage box to the condenser through the outlet pipe for heating and cleaning;

[0039] B10, the second three-way valve opens the sewage channel, and the sewage after cleaning the condenser flows to the sewage area of ​​the water storage box through the sewage return pipe, and then flows to the oil cup through the overflow port;

[0040] B11. Prompt the user to pour the oil cup.

[0041] In order to improve the cleaning effect of the condenser, a temperature sensor that can detect the condenser temperature is installed on the condenser. In step B7, it is detected whether the condenser temperature reaches the washable temperature. If the condenser temperature does not reach the washable temperature, the speed of the cooling fan is reduced and the process returns to step B6. If the condenser temperature reaches the washable temperature, the process proceeds to step B8.

[0042] Compared with the prior art, the advantages of the present invention are: the condensate water treatment system of the refrigeration range hood can clean the evaporator, the condenser and can be cleaned separately, the water storage box has a clean water area and a sewage area, wherein the clean water inlet pipe, the clean water return pipe and the outlet pipe are all connected to the clean water area of ​​the water storage box, the sewage inlet pipe and the sewage return pipe are all connected to the sewage area, and the cleaned sewage flows into the sewage area and can be directly discharged into the oil cup after overflowing, instead of being pumped out by the water pump, which will not clog the water pump and cause damage to the water pump, and sewage will not accumulate in the water storage box and will not produce odor. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of a condensate water treatment system of a refrigeration-type range hood according to an embodiment of the present invention;

[0044] Figure 2 for Figure 1 A schematic structural diagram of the condensate treatment system from another angle is shown;

[0045] Figure 3 for Figure 1 A schematic diagram of the structure of the condensate treatment system from another different angle is shown;

[0046] Figure 4 It is a structural schematic diagram of a water storage box according to an embodiment of the present invention;

[0047] Figure 5 A schematic flow chart of a normal working water circulation system of a condensate water treatment system according to an embodiment of the present invention;

[0048] Figure 6 It is a schematic diagram of the process of starting the evaporator self-cleaning of the condensate water treatment system according to an embodiment of the present invention;

[0049] Figure 7 This is a schematic diagram of the process of starting condenser self-cleaning in the condensate treatment system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0050] The present invention is further described in detail below with reference to the accompanying drawings.

[0051] like Figures 1 to 4 As shown, the condensate treatment system of the refrigeration type range hood of this embodiment includes main components such as a compressor 1, an indoor unit module 2, an outdoor unit module 3, a water storage box 4, a clean water inlet pipe 51, a sewage inlet pipe 52, a first three-way valve 53, a water outlet pipe 54, a clean water return pipe 55, a sewage return pipe 56, a second three-way valve 57, a water pump 58 and a liquid distributor 6.

[0052] The indoor module 2 includes an indoor housing 21, an evaporator 22 and an indoor fan 23, and the outdoor module 3 includes an outdoor housing 31, a condenser 32 and a heat dissipation fan 33. The indoor module 2 and the outdoor module 3 are arranged adjacent to each other. Along the air flow direction, the indoor fan 23 is arranged downstream of the evaporator 22, and the heat dissipation fan 33 is arranged downstream of the condenser 32. The compressor 1, the condenser 32 and the evaporator 22 are connected through the refrigerant pipeline 7. The compressor 1, the condenser 32 and the evaporator 22 constitute an air conditioning component. After the compressor 1 is started, condensed water will condense on the surface of the evaporator 22. Its working principle is the same as that of the existing air conditioning principle, which will not be described in detail here.

[0053] In this embodiment, a condensate outlet is opened at the bottom of the inner casing 21, and a condensate return port is opened at the bottom of the outer casing 31. The inlet of the first three-way valve 53 is connected to the condensate outlet, the first outlet of the first three-way valve 53 is connected to the water inlet end of the clean water inlet pipe 51, the second outlet of the first three-way valve 53 is connected to the water inlet end of the sewage inlet pipe 52, the inlet of the second three-way valve 57 is connected to the condensate return port, the first outlet of the second three-way valve 57 is connected to the water inlet end of the clean water return pipe 55, and the second outlet of the second three-way valve 57 is connected to the water inlet end of the sewage return pipe 56.

[0054] The water storage box 4 is divided into a clean water area 41 and a sewage area 42. The depth of the clean water area 41 is less than that of the sewage area 42. The clean water area 41 and the sewage area 42 are separated by a water retaining dam 43. The sewage area 42 is provided with an overflow port 44. The height of the water retaining dam 43 is higher than the height of the overflow port 44. The height of the water retaining dam 43 is lower than the edge height of the water storage box 4, which effectively prevents the clean water and the sewage from mixing with each other and facilitates the smooth outflow of the sewage. The outlet end of the clean water inlet pipe 51 and the outlet end of the clean water return pipe 55 are both connected to the clean water area 41, and the outlet end of the sewage inlet pipe 52 and the outlet end of the sewage return pipe 56 are both connected to the sewage area 42. The water in the clean water area 41 is transported to the condenser 32 through the outlet pipe 54 and the water pump 58. In order to achieve uniform liquid distribution, a liquid distributor 6 capable of distributing liquid to the condenser 32 is installed on the top of the condenser 32 , and the water outlet of the water outlet pipe 54 is connected to the water inlet of the liquid distributor 6 .

[0055] like Figure 5 As shown, the control method of the condensate treatment system of the refrigeration type range hood includes the following steps:

[0056] S1, power on;

[0057] S2, start the refrigeration system;

[0058] S3, the first three-way valve 53 opens the water purification channel;

[0059] S4, the evaporator 22 produces condensed water;

[0060] S5, the condensed water flows into the clean water inlet pipe 51, and then flows into the clean water area 41 of the water storage box 4;

[0061] S6, start the water pump 58, and pump the condensed water in the water purification area 41 to the condenser 32 through the water outlet pipe 54 for evaporation and heat dissipation;

[0062] S7, the second three-way valve 57 opens the clean water channel, and the condensed water that cannot be evaporated by the condenser 32 flows back to the clean water area 41 of the water storage box 4 through the clean water reflux pipe.

[0063] Furthermore, the water overflowing from the clean water area 41 flows over the water retaining dam 43 into the sewage area 42 , and then flows into the oil cup of the range hood through the overflow port 44 .

[0064] The above process is the condensed water circulation process when the refrigeration system works normally.

[0065] like Figure 6 As shown, when the system starts the evaporator self-cleaning, the control method of the condensate treatment system of the refrigeration type range hood includes the following steps:

[0066] A1. Turn on the power.

[0067] A2, start the evaporator 22 for self-cleaning;

[0068] A3, the first three-way valve 53 opens the sewage channel;

[0069] A4, the indoor fan 23 is turned off, the evaporator 22 starts to condense and defrost, and the evaporator 22 is self-cleaned to produce cleaned sewage;

[0070] A5. The sewage after cleaning the evaporator 22 flows into the sewage area 42 of the water storage box 4 through the sewage inlet pipe 52, and then flows into the oil cup through the overflow port 44;

[0071] A6. Prompt the user to pour the oil cup.

[0072] like Figure 7 As shown, a liquid level sensor (not shown) for detecting the water level of the water box is installed in the water storage box 4. When the system starts the condenser self-cleaning, the control method of the condensate treatment system of the refrigeration range hood includes the following steps:

[0073] B1. Turn on the power;

[0074] B2, start the condenser 32 for self-cleaning;

[0075] B3. Turn on the refrigeration system;

[0076] B4, the first three-way valve 53 opens the water purification channel;

[0077] B5, evaporator 22 produces condensed water;

[0078] B6, the water flows into the clean water inlet pipe 51 from the condenser 32, and then flows to the clean water area 41 of the water storage box 4, and the water pump 58 is turned off;

[0079] B7, the liquid level sensor detects whether the water level in the water box has reached the washable water level;

[0080] If the water level in the water box does not reach the washable water level, return to step B6;

[0081] If the water level in the water box reaches the washable level, proceed to step B8;

[0082] B8, water pump 58 starts pumping water;

[0083] B9, the water pump 58 pumps the water in the water purification area 41 of the water storage box 4 to the condenser 32 through the water outlet pipe 54 for heating and cleaning;

[0084] B10, the second three-way valve 57 opens the sewage channel, and the sewage after cleaning the condenser 32 flows to the sewage area 42 of the water storage box 4 through the sewage return pipe 56, and then flows to the oil cup through the overflow port 44;

[0085] B11. Prompt the user to pour the oil cup.

[0086] In addition, a temperature sensor (not shown) capable of detecting the temperature of the condenser 32 is installed on the condenser 32. In step B7, it is detected whether the temperature of the condenser 32 reaches the washable temperature. If the temperature of the condenser 32 does not reach the washable temperature, the speed of the cooling fan 33 is reduced and the process returns to step B6. If the temperature of the condenser 32 reaches the washable temperature, the process proceeds to step B8.

[0087] It can be known from the above control method that the condensate treatment system of this embodiment can clean the evaporator 22 alone, or can clean the condenser 32 alone, or can clean the evaporator 22 and the condenser 32 at the same time, and the sewage generated after cleaning will not mix with the clean water in the water storage box 4 when it flows back to the water storage box 4. On the one hand, it will not block the water pump 58 and cause damage to the water pump 58, and on the other hand, it will also avoid the water storage box 4 from generating odor.

[0088] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A condensate water treatment system for a refrigeration-type range hood, comprising a compressor (1), an internal unit module (2), an external unit module (3) and a water storage box (4), wherein the internal unit module (2) comprises an internal unit housing (21), an evaporator (22) and an internal unit fan (23), and the external unit module (3) comprises an external unit housing (31), a condenser (32) and a heat dissipation fan (33), the compressor (1), the condenser (32) and the evaporator (22) are connected via a refrigerant pipeline (7), a condensate water outlet is provided at the bottom of the internal unit housing (21), and a condensate water return port is provided at the bottom of the external unit housing (31), and the system is characterized in that: The apparatus further comprises a clean water inlet pipe (51), a sewage inlet pipe (52), a first three-way valve (53), an outlet pipe (54), a clean water return pipe (55), a sewage return pipe (56) and a second three-way valve (57), wherein the inlet of the first three-way valve (53) is connected to the condensed water outlet, the first outlet of the first three-way valve (53) is connected to the water inlet end of the clean water inlet pipe (51), the second outlet of the first three-way valve (53) is connected to the water inlet end of the sewage inlet pipe (52), the inlet of the second three-way valve (57) is connected to the condensed water return pipe, and the outlet of the second three-way valve (57) is connected to the condensed water return pipe. The first outlet is connected to the water inlet end of the clean water return pipe (55), the second outlet of the second three-way valve (57) is connected to the water inlet end of the sewage return pipe (56), the water storage box (4) is divided into a clean water area (41) and a sewage area (42), the water outlet end of the clean water inlet pipe (51) and the water outlet end of the clean water return pipe (55) are both connected to the clean water area (41), the water outlet end of the sewage inlet pipe (52) and the water outlet end of the sewage return pipe (56) are both connected to the sewage area (42), and the water in the clean water area (41) is transported to the condenser (32) through the outlet pipe (54).

2. The condensate treatment system for a refrigeration range hood according to claim 1, characterized in that: The clean water area (41) and the sewage area (42) are separated by a water retaining dam (43); the sewage area (42) is provided with an overflow port (44); the height of the water retaining dam (43) is higher than the height of the overflow port (44); and the height of the water retaining dam (43) is lower than the edge height of the water storage box (4).

3. The condensate treatment system for a refrigeration range hood according to claim 2, characterized in that: The depth of the clean water area (41) is less than the depth of the sewage area (42).

4. The condensate treatment system for a refrigeration range hood according to claim 2, characterized in that: A water pump (58) is also included, and the water in the water purification area (41) is transported to the condenser (32) through the water pump (58) and the water outlet pipe (54).

5. The condensate treatment system for a refrigeration range hood according to claim 1, characterized in that: A liquid distributor (6) capable of distributing liquid to the condenser (32) is installed on the top of the condenser (32), and the water outlet of the water outlet pipe (54) is connected to the water inlet of the liquid distributor (6).

6. The condensate treatment system for a refrigeration range hood according to claim 1, characterized in that: The indoor unit module (2) and the outdoor unit module (3) are arranged adjacent to each other. Along the air flow direction, the indoor unit fan (23) is arranged downstream of the evaporator (22), and the heat dissipation fan (33) is arranged downstream of the condenser (32).

7. A control method for a condensate treatment system of a refrigeration range hood, characterized in that The control method is applied to the condensate treatment system according to claim 4, comprising the following steps: S1, power on; S2, start the refrigeration system; S3, the first three-way valve (53) opens the water purification channel; S4, the evaporator (22) produces condensed water; S5, the condensed water flows into the clean water inlet pipe (51), and then flows into the clean water area (41) of the water storage box (4); S6, turning on the water pump (58), pumping the condensed water in the water purification area (41) to the condenser (32) through the water outlet pipe (54), and performing evaporation and heat dissipation; S7, the second three-way valve (57) opens the clean water channel, and the condensed water that cannot be evaporated by the condenser (32) flows back to the clean water area (41) of the water storage box (4) through the clean water return pipe.

8. The control method of the condensate treatment system of the refrigeration type range hood according to claim 7, characterized in that: The water overflowing from the clean water area (41) flows over the water retaining dam (43) into the sewage area (42), and then flows into the oil cup of the range hood through the overflow port (44).

9. A control method for a condensate treatment system of a refrigeration range hood, characterized in that The control method is applied to the condensate treatment system according to claim 2, and the control method comprises the following steps: A1. Turn on the power. A2, start the evaporator (22) for self-cleaning; A3, the first three-way valve (53) opens the sewage channel; A4. The indoor fan (23) is turned off, and the evaporator (22) starts to condense and defrost, and the evaporator (22) is self-cleaned to produce cleaned sewage; A5. The wastewater after cleaning the evaporator (22) flows into the wastewater area (42) of the water storage box (4) through the wastewater inlet pipe (52), and then flows into the oil cup through the overflow port (44); A6. Prompt the user to pour the oil cup.

10. A control method for a condensate treatment system of a refrigeration range hood, characterized in that The control method is applied to the condensate treatment system according to claim 4, wherein a liquid level sensor for detecting the water level of the water box is installed in the water storage box (4), and the control method comprises the following steps: B1. Turn on the power; B2, start the condenser (32) for self-cleaning; B3. Turn on the refrigeration system; B4, the first three-way valve (53) opens the water purification channel; B5, evaporator (22) produces condensed water; B6, the water from the condenser (32) flows into the clean water inlet pipe (51), and then flows to the clean water area (41) of the water storage box (4), and the water pump (58) is turned off; B7, the liquid level sensor detects whether the water level in the water box has reached the washable water level; If the water level in the water box does not reach the washable water level, return to step B6; If the water level in the water box reaches the washable level, proceed to step B8; B8, water pump (58) starts pumping water; B9, the water pump (58) pumps the water in the water purification area (41) of the water storage box (4) to the condenser (32) through the water outlet pipe (54) for heating and cleaning; B10, the second three-way valve (57) opens the sewage channel, and the sewage after cleaning the condenser (32) flows through the sewage return pipe (56) to the sewage area (42) of the water storage box (4), and then flows to the oil cup through the overflow port (44); B11. Prompt the user to pour the oil cup.

11. The control method of the condensate treatment system of the refrigeration range hood according to claim 10, characterized in that: A temperature sensor capable of detecting the temperature of the condenser (32) is installed on the condenser (32). In step B7, it is detected whether the temperature of the condenser (32) reaches a washable temperature. If the temperature of the condenser (32) does not reach a washable temperature, the speed of the cooling fan (33) is reduced and the process returns to step B6. If the temperature of the condenser (32) reaches a washable temperature, the process proceeds to step B8.

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