Energy-saving variable frequency refrigeration device and method

Abstract

The application relates to the technical field of refrigeration equipment, and discloses an energy-saving variable-frequency refrigeration equipment and method, which comprises a shell, an evaporator, a compressor and a condenser which are sequentially connected and fixedly installed in the shell, an air outlet pipe which is connected to the evaporator and extends out of the shell, a first filter plate and a second filter plate which are fixedly installed in regions corresponding to the condenser on the side wall of the shell, a second fan which is fixedly installed on the inner side wall of the shell and blows air to the condenser, the second fan being located in the region of the first filter plate, and a first sealing chamber which is fixedly installed on the bottom surface in the shell. The application has the beneficial effect that: the cold air which is heat-exchanged with the air outlet pipe is enclosed, isolated and stored in the first sealing chamber, so that the air in the shell is prevented from directly escaping after heat-exchange and cooling with the air outlet pipe, the gas which is heat-exchanged with the air outlet pipe is ensured to be at a relatively low temperature, the temperature loss of the cold air in the air outlet pipe is reduced, the refrigeration efficiency is improved, and the energy-saving effect is further improved.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, specifically to an energy-saving variable frequency refrigeration equipment and method. Background Technology

[0002] Refrigeration units mainly consist of compressors, condensers, expansion valves, evaporators, and control systems. The condenser, as a heat exchanger that uses a refrigerant medium for circulating cooling, is also an important component of industrial refrigeration units and is widely used in various fields.

[0003] In warmer weather, the higher air temperature reduces the heat dissipation effect of the condenser, increasing its workload and resulting in higher energy consumption. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a device for refrigeration that achieves high refrigeration efficiency and low energy consumption.

[0005] The objective of this invention can be achieved through the following technical solutions: An energy-saving variable frequency refrigeration device includes a housing, in which an evaporator, a compressor, and a condenser are fixedly installed in sequence. The evaporator is connected to an outlet pipe extending out of the housing. A first filter plate and a second filter plate are fixedly installed on the side wall of the housing in areas corresponding to the condenser. A second fan is fixedly installed on the inner side wall of the housing to blow air onto the condenser. The second fan is located in the area where the first filter plate is located. A first sealing chamber is fixedly installed on the bottom surface of the housing. The first sealing chamber is connected to two sets of circulation pipes, which are connected to heat exchange pipes fixedly installed on the outlet pipe. A movable plate is slidably mounted on the bottom surface of the housing, and a servo module that drives the movable plate to move is provided inside the housing. The movable plate moves along the condenser, and two sets of air blowing slots with opposite openings are fixedly mounted on the movable plate. The sides of the air blowing slots are flush with the ends of the heat dissipation fins on the condenser. The two sets of air blowing slots are connected by a connecting pipe. A temperature sensor is fixedly installed inside the air blowing slot, and a circulating fan is provided inside the air blowing slot. A second air pump for extracting gas from the air blowing slot is fixedly mounted on one of the air blowing slots. A first air pump is fixedly installed inside the housing. The air inlet of the first air pump is connected to the first sealing chamber, and the air outlet of the first air pump is connected to the air blowing slot.

[0006] As a further aspect of the present invention: an air guide groove is fixedly installed on the inner side wall of the housing, the air guide groove is frame-shaped and the second filter plate is located within the coverage area of ​​the air guide groove.

[0007] As a further aspect of the present invention: a guide tube is fixedly installed in the first sealed chamber, the guide tube is connected to one of the sets of circulation pipes, and a first fan is installed inside the guide tube.

[0008] As a further aspect of the present invention: a V-shaped air guide plate is fixedly installed on the air duct near the second fan, with the opening of the air guide plate facing the air duct.

[0009] As a further aspect of the present invention: a second sealing chamber is fixedly installed inside the housing, the first sealing chamber is located inside the second sealing chamber and the area between the first sealing chamber and the second sealing chamber is a closed cavity, which is filled with cooling water.

[0010] As a further aspect of the present invention: a temporary storage tube is fixedly installed inside the sealed cavity, one end of the temporary storage tube extends out of the second sealed chamber and the other end extends into the first sealed chamber, and valves are fixedly installed at both ends of the temporary storage tube.

[0011] As a further aspect of the present invention: a blowing chamber is fixedly installed on the side wall where the second fan is located inside the housing. The blowing chamber is connected to the air outlet of the second air pump. Multiple sets of spaced air outlets are opened on the side of the blowing chamber near the second fan.

[0012] The present invention also provides a method applied to the above-described energy-saving variable frequency refrigeration equipment, comprising the following steps: Step S1: Cooling is achieved through the evaporator, compressor, and condenser. Cold air is blown out from the outlet pipe. Outside air is filtered by the first filter plate and then blown towards the condenser for cooling by the action of the first fan. Step S2: The air in the first sealed chamber enters the heat exchange tube through a set of circulation pipes, and the air in the heat exchange tube returns to the first sealed chamber through another set of circulation pipes. During the air circulation process, it exchanges heat with the cold air in the outlet pipe, and the cold air after heat exchange is stored in the first sealed chamber. Step S3: When the air temperature is high and the heat dissipation effect of the condenser decreases, the air blowing channel is moved by the moving plate so that the side of the air blowing channel is in contact with the heat dissipation fins on the condenser and the two ends of the air blowing channel are in contact with the mounting frame on the condenser. Thus, a closed area is formed by the air blowing channel, the heat dissipation fins and the mounting frame on the condenser. Step S4: The hot air in the enclosed area is extracted by the second air pump, and then the cooler air in the first sealed chamber is extracted by the first air pump. The cooler air is then delivered to the enclosed area. The cooler air comes into contact with the heat dissipation fins in the enclosed area to cool down. The position of the air blower is changed to assist in cooling the heat dissipation fins at different positions of the condenser.

[0013] The beneficial effects of this invention are: (1) In this invention, the air in the first sealed chamber enters the heat exchange tube through a set of circulation pipes, and the air in the heat exchange tube returns to the first sealed chamber through another set of circulation pipes, thereby realizing the circulation of air in the first sealed chamber and the heat exchange tube. During the air circulation, the air exchanges heat with the cold air in the outlet pipe, so that the air in the first sealed chamber and the heat exchange tube are both at a low temperature. The cold air after exchanging heat with the outlet pipe is sealed and isolated and stored through the first sealed chamber, so as to prevent the air in the shell from directly escaping after exchanging heat with the outlet pipe and cooling down. At the same time, it ensures that the gas exchanging heat with the outlet pipe is at a low temperature, reducing the temperature loss of the cold air in the outlet pipe, improving the refrigeration efficiency, and further improving the energy-saving effect.

[0014] (2) In this invention, when the air temperature is high and the heat dissipation effect of the condenser decreases, a closed area is formed by the air duct, heat dissipation fins and mounting frame on the condenser. The hot air in this area is extracted by the second air pump. Then, the air with a lower temperature in the first sealed chamber is extracted by the first air pump. The lower temperature air is then delivered to the closed area formed by the air duct, heat dissipation fins and mounting frame on the condenser. The lower temperature air contacts the heat dissipation fins in the closed area to cool down. The air with a lower temperature is blown by the circulating fan in the air duct to ensure that the heat dissipation fins in the closed area can contact the lower temperature air to cool down, thus ensuring the cooling effect. Then, the moving plate moves again to move the closed area. At this time, the new heat dissipation fins are located in the closed area. The above steps are repeated to accelerate the cooling of the heat dissipation fins again by the lower temperature air. In this way, all heat dissipation fins can be cooled down by the additional auxiliary cooling of the lower temperature air, thereby further improving the cooling capacity of the condenser and ensuring the cooling effect of the equipment.

[0015] (3) In this invention, there is air in the temporary storage tube and the valves at both ends of the temporary storage tube are in a closed state. When the air in the first sealed chamber is partially extracted, no air is replenished, ensuring that the air in the first sealed chamber is always at a low temperature, which further improves the cooling effect on the condenser. When all the air in the first sealed chamber is extracted, the air in the temporary storage tube will enter the first sealed chamber. Outside air enters the temporary storage tube. The air in the temporary storage tube is always in the cooling water for initial cooling, and then replenished to the first sealed chamber. This avoids a large temperature difference between the air in the first sealed chamber and the air in the outlet pipe, reduces the loss of cold air, and further improves the energy-saving effect.

[0016] (4) In this invention, after the air in the enclosed area formed by the air duct, heat dissipation fins and mounting frame on the condenser reaches the set temperature, the set temperature is lower than the air temperature. At this time, the air in the enclosed area is drawn by the second air pump and transported to the air duct chamber. Then, the air is blown through the air duct on the air duct chamber to the area where the second fan is acting below. The second fan blows the air, which is lower than the air temperature, towards the condenser, thereby realizing the secondary cooling and utilization of the low temperature air, further improving the cooling effect of the condenser and ensuring the quality of the equipment. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the internal structure of the shell in this invention.

[0020] Figure 3 This is a schematic diagram of the structure of the second fan in this invention.

[0021] Figure 4 This is a schematic diagram of the temporary storage tube in this invention.

[0022] Figure 5 This is a front view of the first sealed chamber in this invention.

[0023] Figure 6 This is a schematic diagram of the air blowing groove in this invention.

[0024] In the diagram: 1. Shell; 2. Evaporator; 3. Compressor; 4. Condenser; 5. Outlet pipe; 6. First sealed chamber; 7. Second sealed chamber; 8. Temporary storage pipe; 9. Heat exchange pipe; 10. Circulation pipe; 11. Air guide tube; 12. First fan; 13. Sealed cavity; 14. Second fan; 15. First filter plate; 16. Second filter plate; 17. Air guide duct; 18. Moving plate; 19. Servo module; 20. Air blowing duct; 21. Temperature sensor; 22. Connecting pipe; 23. First air pump; 24. Second air pump; 25. Air guide plate; 26. Air blowing chamber. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figures 1-6As shown, the present invention is an energy-saving variable frequency refrigeration device, including a housing 1. An evaporator 2, a compressor 3, and a condenser 4 are fixedly installed in sequence inside the housing 1. An exhaust pipe 5 extending out of the housing 1 is connected to the evaporator 2. A first filter plate 15 and a second filter plate 16 are fixedly installed on the side wall of the housing 1 in the area corresponding to the condenser 4, respectively. A second fan 14 blowing air to the condenser 4 is fixedly installed on the inner side wall of the housing 1. The second fan 14 is located in the area where the first filter plate 15 is located. An air guide groove 17 is fixedly installed on the inner side wall of the housing 1. The air guide groove 17 is frame-shaped and the second filter plate 16 is located in the area covered by the air guide groove 17. A first sealing chamber 6 is fixedly installed on the bottom surface of the housing 1. The first sealing chamber 6 is connected to two sets of circulation pipes 10. The circulation pipes 10 are connected to heat exchange pipes 9 fixedly installed on the exhaust pipe 5. An air guide tube 11 is fixedly installed in the first sealing chamber 6. The air guide tube 11 is connected to one of the sets of circulation pipes 10. A first fan 12 is installed inside the air guide tube 11. A movable plate 18 is slidably installed on the bottom surface of the housing 1, and a servo module 19 is provided inside the housing 1 to drive the movable plate 18 to move. The movable plate 18 moves along the condenser 4, and two sets of air ducts 20 with opposite openings are fixedly installed on the movable plate 18. The side of the air duct 20 is flush with the end of the heat dissipation fins on the condenser 4. The two sets of air ducts 20 are connected by a connecting pipe 22. A temperature sensor 21 is fixedly installed inside the air duct 20. A circulating fan is provided inside the air duct 20. A second air pump 24 for extracting gas from the air duct 20 is fixedly installed on one set of air ducts 20. A first air pump 23 is fixedly installed inside the housing 1. The air inlet of the first air pump 23 is connected to the first sealing chamber 6, and the air outlet of the first air pump 23 is connected to the air duct 20. A V-shaped air guide plate 25 is fixedly installed on the air duct 20 near the second fan 14, and the opening of the air guide plate 25 faces the air duct 20.

[0027] In practical application, this embodiment uses an evaporator 2, a compressor 3, and a condenser 4 for refrigeration. Cold air is blown out from the outlet pipe 5. Outside air is filtered by the first filter plate 15 and then blown towards the condenser 4 by the first fan 12 for cooling. After passing through the heat dissipation fins on the condenser 4, the air enters the air guide duct 17. The air then flows in the air guide duct 17 and quickly leaves the housing 1 through the second filter plate 16. The air guide duct 17 allows the air to leave the housing 1 quickly, reducing the residence time of the high-temperature air in the housing 1 and improving the heat dissipation capacity of the condenser 4. According to the actual usage, the rotation speed of the second fan 14 and the speed of the compressor 3 are controlled by the frequency converter to reduce consumption and achieve energy saving. Since the air flowing in the outlet pipe 5 is cold air, it will exchange heat with the air in the heat exchange pipe 9. The first fan 12 causes the air in the first sealed chamber 6 to flow into the circulation pipe 10. The air in the first sealed chamber 6 enters the heat exchange pipe 9 through a set of circulation pipes 10, and the air in the heat exchange pipe 9 returns to the first sealed chamber 6 through another set of circulation pipes 10, thus realizing the circulation of air in the first sealed chamber 6 and the heat exchange pipe 9. During the air circulation, it exchanges heat with the cold air in the outlet pipe 5, so that the air in the first sealed chamber 6 and the heat exchange pipe 9 are both at a low temperature. The first sealed chamber 6 seals and isolates the cold air after exchanging heat with the outlet pipe 5, preventing the air in the shell 1 from directly escaping after exchanging heat with the outlet pipe 5 and cooling down. At the same time, it ensures that the gas exchanging heat with the outlet pipe 5 is at a low temperature, reducing the temperature loss of the cold air in the outlet pipe 5, improving the refrigeration efficiency, and further improving the energy-saving effect. When the air temperature is high and the heat dissipation effect of the condenser 4 decreases, the servo module 19 drives the moving plate 18 to move closer to the condenser 4 until the entire side of the air duct 20 contacts the heat dissipation fins on the condenser 4, and the two ends of the air duct 20 contact the mounting frame on the condenser 4. This forms a closed area through the air duct 20, the heat dissipation fins, and the mounting frame on the condenser 4. The second air pump 24 extracts the hot air from this area, and then the first air pump 23 extracts the cooler air from the first sealed chamber 6. This cooler air is then delivered to the closed area formed by the air duct 20, the heat dissipation fins, and the mounting frame on the condenser 4. The cooler air contacts the heat dissipation fins in the closed area for cooling. The circulating fan in the air duct 20 blows the cooler air, ensuring that the heat dissipation fins in the closed area are cooled. Lower air contact cooling ensures cooling effect. Temperature sensor 21 detects the air temperature in the enclosed area. When the air temperature in the enclosed area reaches the set temperature, the cooling effect decreases. The second air pump 24 then extracts air from the enclosed area. Afterward, the moving plate 18 moves again to move the enclosed area. At this time, the new heat dissipation fins are located in the enclosed area. The above steps are repeated to provide auxiliary cooling to the heat dissipation fins with lower temperature air. This enables all heat dissipation fins to be cooled by additional auxiliary cooling with lower temperature air, further improving the cooling capacity of the condenser 4 and ensuring the cooling effect of the equipment. The air guide plate 25 ensures that the air can stably bypass the area where the air duct 20 is located, reducing the probability of lateral air flow and ensuring the stability of the air flow speed and direction, thus ensuring the cooling effect on the condenser 4.

[0028] Please see Figures 2-5As shown, the present invention is an energy-saving variable frequency refrigeration device. A second sealing chamber 7 is fixedly installed inside the housing 1. A first sealing chamber 6 is located inside the second sealing chamber 7, and the area between the first sealing chamber 6 and the second sealing chamber 7 is a closed cavity 13, which is filled with cooling water.

[0029] Specifically, a temporary storage tube 8 is fixedly installed inside the closed cavity 13. One end of the temporary storage tube 8 extends out of the second sealing chamber 7, and the other end extends into the first sealing chamber 6. Valves are fixedly installed at both ends of the temporary storage tube 8.

[0030] In practical application, this embodiment uses cooling water in the sealed cavity 13 and the second sealed chamber 7 to further seal and isolate the first sealed chamber 6, thereby reducing the impact of external hot air on the cold air inside the first sealed chamber 6. This ensures that the air temperature inside the first sealed chamber 6 remains low, further reducing temperature loss of the cold air in the outlet pipe 5 and improving energy efficiency. Simultaneously, during use, air is present in the temporary storage pipe 8, and the valves at both ends of the temporary storage pipe 8 are closed. When some air is extracted from the first sealed chamber 6, no air is replenished, ensuring that the air temperature inside the first sealed chamber 6 remains low. To further improve the cooling effect on the condenser 4, after all the air in the first sealed chamber 6 is extracted, the valves at both ends of the temporary storage tube 8 are opened. Since the first sealed chamber 6 is under negative pressure, the air in the temporary storage tube 8 will enter the first sealed chamber 6, and the outside air will enter the temporary storage tube 8. Then the valves at both ends of the temporary storage tube 8 are closed again. The air in the temporary storage tube 8 is always in the cooling water for initial cooling, and then it is replenished to the first sealed chamber 6. This avoids a large temperature difference between the air in the first sealed chamber 6 and the air in the outlet pipe 5, reduces the loss of cold air, and further improves the energy-saving effect.

[0031] Please see Figure 2 As shown in Figure 3, the present invention is an energy-saving variable frequency refrigeration device. A blowing chamber 26 is fixedly installed on the side wall where the second fan 14 is located inside the housing 1. The blowing chamber 26 is connected to the air outlet of the second air pump 24. Multiple sets of spaced air outlet holes are opened on the side of the blowing chamber 26 near the second fan 14.

[0032] In practical application, after the air in the enclosed area formed by the air duct 20, heat dissipation fins, and mounting frame on the condenser 4 reaches the set temperature (which is lower than the air temperature), the air in the enclosed area is drawn by the second air pump 24 and transported to the air duct 26. Then, the air is blown through the air vents on the air duct 26 to the area where the second fan 14 operates below. The second fan 14 blows the air, which is lower than the air temperature, towards the condenser 4, achieving secondary cooling and utilization of the low-temperature air, further improving the cooling effect of the condenser 4, and ensuring the quality of the equipment.

[0033] Please see Figures 1-6As shown, the present invention is a method applied to the above-mentioned energy-saving variable frequency refrigeration equipment, which includes the following steps: Step S1: Cooling is achieved through evaporator 2, compressor 3, and condenser 4. Cold air is blown out from the outlet pipe 5. Outside air is filtered through the first filter plate 15 and then blown towards the condenser 4 for cooling under the action of the first fan 12. Step S2: The air in the first sealed chamber 6 enters the heat exchange tube 9 through a set of circulation pipes 10. The air in the heat exchange tube 9 returns to the first sealed chamber 6 through another set of circulation pipes 10. During the air circulation process, it exchanges heat with the cold air in the outlet pipe 5. The cold air after heat exchange is stored in the first sealed chamber 6. Step S3: When the air temperature is high and the heat dissipation effect of the condenser 4 decreases, the air blowing channel 20 is moved by the moving plate 18 so that the side of the air blowing channel 20 is in contact with the heat dissipation fins on the condenser 4 and the two ends of the air blowing channel 20 are in contact with the mounting frame on the condenser 4, thereby forming a closed area through the air blowing channel 20, the heat dissipation fins and the mounting frame on the condenser 4. Step S4: The hot air in the enclosed area is extracted by the second air pump 24, and then the lower temperature air in the first sealed chamber 6 is extracted by the first air pump 23. The lower temperature air is then delivered to the enclosed area. The lower temperature air comes into contact with the heat dissipation fins in the enclosed area to cool down. The position of the air blowing channel 20 is changed to assist in cooling the heat dissipation fins at different positions of the condenser 4.

Claims

1. An energy-saving variable frequency refrigeration device, comprising a housing (1), wherein an evaporator (2), a compressor (3), and a condenser (4) are fixedly installed inside the housing (1) in sequence, characterized in that, The evaporator (2) is connected to an outlet pipe (5) extending out of the shell (1). The first filter plate (15) and the second filter plate (16) are fixedly installed on the side wall of the shell (1) in the area corresponding to the condenser (4). The second fan (14) blowing air to the condenser (4) is fixedly installed on the inner side wall of the shell (1). The second fan (14) is located in the area where the first filter plate (15) is located. The first sealing chamber (6) is fixedly installed on the bottom surface of the shell (1). The first sealing chamber (6) is connected to two sets of circulation pipes (10). The circulation pipes (10) are connected to the heat exchange pipes (9) fixedly installed on the outlet pipe (5). A movable plate (18) is slidably installed on the bottom surface of the housing (1), and a servo module (19) for moving the movable plate (18) is provided inside the housing (1). The movable plate (18) moves along the condenser (4), and two sets of air ducts (20) with opposite openings are fixedly installed on the movable plate (18). The side of the air duct (20) is flush with the end of the heat dissipation fins on the condenser (4). The two sets of air ducts (20) are connected by a connecting pipe (22). A temperature sensor (21) is fixedly installed inside the air duct (20). A circulating fan is provided inside the air duct (20). A second air pump (24) for extracting gas from the air duct (20) is fixedly installed on one set of air ducts (20). A first air pump (23) is fixedly installed inside the housing (1). The air inlet of the first air pump (23) is connected to the first sealing chamber (6), and the air outlet of the first air pump (23) is connected to the air duct (20).

2. The energy-saving variable frequency refrigeration equipment according to claim 1, characterized in that, An air guide trough (17) is fixedly installed on the inner wall of the housing (1). The air guide trough (17) is frame-shaped and the second filter plate (16) is located within the coverage area of ​​the air guide trough (17).

3. The energy-saving variable frequency refrigeration equipment according to claim 1, characterized in that, An air guide tube (11) is fixedly installed in the first sealed chamber (6). The air guide tube (11) is connected to one of the circulation pipes (10). A first fan (12) is installed inside the air guide tube (11).

4. The energy-saving variable frequency refrigeration equipment according to claim 1, characterized in that, A V-shaped air guide plate (25) is fixedly installed on the air duct (20) near the second fan (14), with the opening of the air guide plate (25) facing the air duct (20).

5. The energy-saving variable frequency refrigeration equipment according to claim 1, characterized in that, The housing (1) has a second sealing chamber (7) fixedly installed inside it. The first sealing chamber (6) is located inside the second sealing chamber (7), and the area between the first sealing chamber (6) and the second sealing chamber (7) is a closed cavity (13), which is filled with cooling water.

6. The energy-saving variable frequency refrigeration equipment according to claim 5, characterized in that, A temporary storage tube (8) is fixedly installed inside the closed cavity (13). One end of the temporary storage tube (8) extends out of the second sealing chamber (7), and the other end extends into the first sealing chamber (6). Valves are fixedly installed at both ends of the temporary storage tube (8).

7. The energy-saving variable frequency refrigeration equipment according to claim 1, characterized in that, A blower chamber (26) is fixedly installed on the side wall where the second fan (14) is located inside the housing (1). The blower chamber (26) is connected to the air outlet of the second air pump (24). Multiple sets of spaced air outlets are opened on the side of the blower chamber (26) near the second fan (14).

8. A method, characterized in that, The energy-saving variable frequency refrigeration equipment described in any one of claims 1-7 includes the following steps: Step S1: Refrigeration is carried out through the evaporator (2), compressor (3), and condenser (4). Cold air is blown out from the outlet pipe (5). The outside air is filtered through the first filter plate (15) and then blown to the condenser (4) for cooling under the action of the first fan (12). Step S2: The air in the first sealed chamber (6) enters the heat exchange tube (9) through a set of circulation pipes (10). The air in the heat exchange tube (9) returns to the first sealed chamber (6) through another set of circulation pipes (10). During the air circulation process, it exchanges heat with the cold air in the outlet pipe (5). The cold air after heat exchange is stored in the first sealed chamber (6). Step S3: When the air temperature is high and the heat dissipation effect of the condenser (4) decreases, the air blowing channel (20) is moved by the moving plate (18) so that the side of the air blowing channel (20) is in contact with the heat dissipation fins on the condenser (4) and the two ends of the air blowing channel (20) are in contact with the mounting frame on the condenser (4). Thus, a closed area is formed by the air blowing channel (20), the heat dissipation fins and the mounting frame on the condenser (4). Step S4: The hot air in the enclosed area is extracted by the second air pump (24), and then the air with a lower temperature in the first sealed chamber (6) is extracted by the first air pump (23). The air with a lower temperature is then transported to the enclosed area. The air with a lower temperature comes into contact with the heat dissipation fins in the enclosed area to cool down. The position of the air blowing channel (20) is changed to assist in cooling the heat dissipation fins at different positions of the condenser (4).

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