Air-cooled heat pump air conditioner inlet air cooling device

By designing an air-cooled heat pump inlet cooling device, the problem of uneven inlet air temperature in the air-cooled heat pump was solved. Through the design of cooling and temperature-concentrating mechanisms, the refrigerant was evenly distributed in the system, improving the heat exchange efficiency of the evaporator.

CN122170484APending Publication Date: 2026-06-09WUHU YIJIANG HAICHUANG HIGH-TECH INTELLIGENT AIR CONDITIONING CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WUHU YIJIANG HAICHUANG HIGH-TECH INTELLIGENT AIR CONDITIONING CO LTD
Filing Date
2026-04-07
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

The existing air-cooled heat pump units suffer from reduced heat exchange efficiency due to uneven inlet air temperature.

Method used

An air-cooled heat pump inlet cooling device for air conditioning is designed, including a cooling rack, an air concentrator, a cooling mechanism, an air inlet mechanism, and a temperature concentrator. By dispersing the hot air flow, uniformly cooling the air, and concentrating the air force, the device ensures the uniform distribution of refrigerant in the system.

Benefits of technology

This achieves uniformity of the air inlet temperature in the air-cooled heat pump and improves the heat exchange efficiency of the evaporator.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application relates to the field of air-cooled heat pump units, and discloses an air conditioner air-cooled heat pump air inlet cooling device, which comprises a cooling frame, a front end cover fixedly installed on the cooling frame, an air inlet pipe fixedly installed on the front end cover, a rear end cover fixedly installed on the cooling frame, an air outlet pipe fixedly installed on the rear end cover, and a wind gathering disc fixedly installed on the front end cover and the rear end cover and communicating with the air inlet pipe and the air outlet pipe. The wind gathering disc can disperse the hot air flow, the hot air enters the first connecting pipe and the second connecting pipe again through the air distribution pipe, the first rotating pipe rotates under the action of the fan blade, the hot air uniformly contacts the liquid distribution pipe in the connecting pipe and is rapidly cooled, the temperature of each part is uniform, and the situation that the air inlet temperature of the air-cooled heat pump is not uniform in each place is avoided.
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Description

Technical Field

[0001] This invention relates to the field of air-cooled heat pump units, specifically to an air-cooled heat pump inlet cooling device for air conditioning. Background Technology

[0002] An air-cooled heat pump unit is a circulating system consisting of a heat exchanger, a throttling device, a heat absorber, and a compressor. Existing air-cooled heat pumps are easily affected by high ambient temperatures during use, which leads to a decrease in heat exchange efficiency and overall performance. Therefore, heat pump cooling fins are added to lower the temperature of the surrounding environment and the temperature of the heat pump cooling fins themselves, thereby improving the heat exchange efficiency of the equipment.

[0003] However, when the heat pump's cooling fins come into contact with the incoming air, they cannot cool the air evenly. Furthermore, the area where the airflow comes into contact with the cooling fins has better heat dissipation, but the area inside the airflow cannot effectively dissipate heat. This results in uneven airflow temperature throughout the air-cooled heat pump, leading to poor performance of the equipment. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an air-cooled heat pump inlet cooling device for air conditioning, which solves the problem of uneven inlet air temperature in air-cooled heat pumps.

[0005] To achieve the above objectives, the present invention provides the following technical solution: An air-cooled heat pump inlet cooling device for air conditioning includes a cooling rack, a front end cover fixedly installed on the cooling rack, an air inlet pipe fixedly installed on the front end cover, a rear end cover fixedly installed on the cooling rack, an air outlet pipe fixedly installed on the rear end cover, and an air concentrator plate connected to the air inlet pipe and the air outlet pipe fixedly installed on both the front end cover and the rear end cover. The air-collecting plate is equipped with a cooling mechanism for cooling the hot air; The cooling rack is equipped with an air intake mechanism that ensures uniform distribution of refrigerant in the system. The cooling rack is equipped with a temperature-concentrating mechanism to prevent the refrigerant from cooling down too quickly. As hot air enters the cooling mechanism through the air-concentrating plate, the cooling mechanism drives the air intake mechanism to rotate, which in turn drives the temperature-concentrating mechanism to reciprocate.

[0006] Preferably, the cooling mechanism includes two sets of No. 1 air distribution pipes fixedly installed on the air concentrator plate, and a No. 1 connecting pipe is fixedly installed on each set of No. 1 air distribution pipes. A No. 1 rotating pipe is rotatably installed between the No. 1 air distribution pipe and the No. 1 connecting pipe.

[0007] Preferably, the cooling mechanism further includes a bearing fixedly installed on a first air distribution pipe and a first connecting pipe, and the bearing is fixedly connected to a first rotating pipe, wherein multiple sets of fan blades are evenly installed on the first rotating pipe.

[0008] Preferably, the cooling mechanism further includes two sets of arc-shaped main pipes fixedly installed on the cooling rack. Two sets of No. 1 liquid distribution pipes are fixedly installed at both ends of the arc-shaped main pipes, and the No. 1 liquid distribution pipes have a threaded structure. One end of each of the two sets of No. 1 liquid distribution pipes is fixedly installed with a No. 1 liquid inlet pipe, and one end of each of the other two sets of No. 1 liquid distribution pipes is fixedly installed with a No. 1 liquid outlet pipe.

[0009] Preferably, the cooling mechanism further includes a second air distribution pipe fixedly installed on the air distribution plate, and a second connecting pipe is fixedly installed between the two sets of the second air distribution pipes.

[0010] Preferably, the cooling mechanism further includes a straight pipe fixedly installed on the cooling rack, and two sets of No. 2 liquid distribution pipes are fixedly installed at both ends of the straight pipe, wherein a No. 2 liquid inlet pipe is fixedly installed at one end of each of the two sets of No. 2 liquid distribution pipes, and a No. 2 liquid outlet pipe is fixedly installed at one end of each of the other two sets of No. 2 liquid distribution pipes.

[0011] Preferably, the air intake mechanism includes two sets of support pipes fixedly installed on the cooling rack, and each set of support pipes is fixedly installed with a No. 2 bearing.

[0012] Preferably, the air intake mechanism further includes a second rotating pipe fixedly installed on a second bearing, a fan fixedly installed on the second rotating pipe, and an outer sprocket fixedly installed on both the first and second rotating pipes, with a chain wound around the outer sprocket.

[0013] Preferably, the temperature-gathering mechanism includes a wind-gathering hood fixedly installed on a cooling rack. The wind-gathering hood has two sets of limiting grooves, and two sets of fixing rods are fixedly installed on each set of limiting grooves. A reciprocating lead screw is rotatably installed on each set of limiting grooves.

[0014] Preferably, the temperature-gathering mechanism further includes a limiting block slidably mounted on the limiting groove, a wind-gathering ring fixedly mounted on the limiting block, two sets of rotating rods rotatably mounted on the wind-gathering cover, two sets of first helical teeth fixedly mounted on each set of rotating rods, and second helical teeth meshing with the first helical teeth fixedly mounted on the reciprocating screw and the fan.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention, through the setting of the cooling mechanism, disperses the hot air flow through the air concentrator. The hot air re-enters the first and second connecting pipes through the air distribution pipe. Under the action of the fan blades, the first rotating pipe rotates. The hot air comes into uniform contact with the liquid distribution pipe in the connecting pipe and is rapidly cooled. The temperature of each part is uniform, avoiding the situation of uneven air inlet temperature in air-cooled heat pumps.

[0016] 2. The present invention, through the setting of the air inlet mechanism, drives the rotation of the first rotating pipe to drive the rotation of the second rotating pipe, which in turn drives the fan to rotate. The fan blows the hot air around the connecting pipe toward the liquid distribution pipe. The refrigerant flowing out through the arc-shaped main pipe and the straight pipe will not be subject to a large temperature difference, so that the refrigerant is evenly distributed in the system, thereby improving the heat exchange efficiency of the evaporator.

[0017] 3. The present invention, through the setting of the temperature-concentrating mechanism, causes the limiting block to drive the air-concentrating ring to reciprocate around the first liquid distribution pipe on the air-concentrating shroud by the rotation of the fan, so that the air energy blown by the fan is concentrated on the air-concentrating shroud and acts on the first liquid distribution pipe, thereby enhancing the uniformity of refrigerant cooling in the first liquid distribution pipe and improving the heat exchange efficiency of the evaporator. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention from a first-view perspective; Figure 2 This is a schematic diagram of the overall structure of the present invention from a second perspective; Figure 3 This is a schematic diagram of the overall internal structure of the No. 1 and No. 2 connecting pipes of the present invention; Figure 4 This is a schematic diagram of the overall structure of the air intake mechanism of the present invention; Figure 5 This is a schematic diagram showing the positional relationship between the support tube and the second rotating tube of the present invention; Figure 6 This is a schematic diagram of the overall structure of the wind-gathering ring of the present invention.

[0019] In the diagram: 1. Cooling rack; 11. Front cover; 12. Air inlet pipe; 13. Rear cover; 14. Air outlet pipe; 15. Air concentrator; 2. Cooling mechanism; 201. No. 1 air distribution pipe; 202. No. 1 rotating pipe; 203. No. 1 connecting pipe; 204. No. 1 bearing; 205. Fan blade; 206. Arc-shaped main pipe; 207. No. 1 liquid distribution pipe; 208. No. 1 liquid inlet pipe; 209. No. 1 liquid outlet pipe; 210. No. 2 air distribution pipe; 211. No. 2 connecting pipe; 212. Straight pipe; 21 3. No. 2 liquid distribution pipe; 214. No. 2 liquid inlet pipe; 215. No. 2 liquid outlet pipe; 3. Air inlet mechanism; 301. Support pipe; 302. No. 2 bearing; 303. No. 2 rotating pipe; 304. Fan; 305. Outer sprocket; 306. Chain; 4. Temperature gathering mechanism; 401. Air gathering cover; 402. Limiting groove; 403. Fixing rod; 404. Reciprocating screw; 405. Limiting block; 406. Air gathering ring; 407. Rotating rod; 408. No. 1 helical gear; 409. No. 2 helical gear. Detailed Implementation

[0020] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0021] Example 1 Because the intake air temperature of an air-cooled heat pump is uneven throughout, in order to solve this problem, refer to Figures 1-6 This embodiment proposes an air-cooled heat pump air intake cooling device, including a cooling rack 1, a front end cover 11 fixedly installed on the cooling rack 1, an air inlet pipe 12 fixedly installed on the front end cover 11, a rear end cover 13 fixedly installed on the cooling rack 1, an air outlet pipe 14 fixedly installed on the rear end cover 13, and an air concentrator 15 connected to the air inlet pipe 12 and the air outlet pipe 14 fixedly installed on both the front end cover 11 and the rear end cover 13, through which hot air is delivered to the cooling mechanism 2; The air concentrator 15 is equipped with a cooling mechanism 2 for cooling hot air, and the cooling rack 1 is equipped with an air inlet mechanism 3 for evenly distributing the refrigerant in the system. The cooling rack 1 is also equipped with a temperature-concentrating mechanism 4 to prevent the refrigerant from cooling down too quickly. As hot air enters the cooling mechanism 2 through the air concentrator 15, the cooling mechanism 2 drives the air inlet mechanism 3 to rotate and simultaneously drives the temperature-concentrating mechanism 4 to reciprocate, which can blow the hot airflow on the connecting pipe onto the liquid distribution pipe.

[0022] The cooling mechanism 2 includes two sets of No. 1 air distribution pipes 201 fixedly mounted on the air concentrator 15. Each No. 1 air distribution pipe 201 is fixedly mounted with a No. 1 connecting pipe 203. A No. 1 rotating pipe 202 is rotatably mounted between the No. 1 air distribution pipe 201 and the No. 1 connecting pipe 203. The cooling mechanism 2 also includes a No. 1 bearing 204 fixedly mounted on the No. 1 air distribution pipe 201 and the No. 1 connecting pipe 203, and the No. 1 bearing 204 is fixedly connected to the No. 1 rotating pipe 202 to facilitate its rotation. Multiple sets of fan blades 205 are evenly mounted on the No. 1 rotating pipe 202 for cooling. Mechanism 2 also includes two sets of arc-shaped main pipes 206 fixedly installed on the cooling rack 1. Two sets of No. 1 liquid distribution pipes 207 are fixedly installed at both ends of the arc-shaped main pipes 206. The No. 1 liquid distribution pipes 207 have a threaded structure, identical to the structure of the No. 2 liquid distribution pipe 213. The two sets of liquid distribution pipes are interwoven, increasing the contact area with hot air. One end of each set of No. 1 liquid distribution pipes 207 is fixedly installed with a No. 1 liquid inlet pipe 208, and one end of each of the other two sets of No. 1 liquid distribution pipes 207 is fixedly installed with a No. 1 liquid outlet pipe 209. Cooling mechanism 2 also includes a No. 2 air distribution pipe 2 fixedly installed on the air concentrator 15. 10. A No. 2 connecting pipe 211 is fixedly installed between the two sets of No. 2 air distribution pipes 210. The cooling mechanism 2 also includes a straight pipe 212 fixedly installed on the cooling rack 1. The straight pipe 212 does not contact the arc-shaped main pipe 206 to facilitate the flow of refrigerant. Two sets of No. 2 liquid distribution pipes 213 are fixedly installed at both ends of the straight pipe 212. One end of each of the two sets of No. 2 liquid distribution pipes 213 is fixedly installed with a No. 2 liquid inlet pipe 214, and one end of the other two sets of No. 2 liquid distribution pipes 213 is fixedly installed with a No. 2 liquid outlet pipe 215. The liquid inlet pipe is used to transport refrigerant, and the liquid outlet pipe is used to discharge refrigerant. The equipment is connected... After completion, the hot air passes through the inlet pipe 12 and the air concentrator 15 in sequence and then enters the first air distribution pipe 201 and the second air distribution pipe 210 respectively, so that its flow rate is dispersed and it is easy to cool down. The hot air passes through the air distribution pipe and then enters the first connecting pipe 203 and the second connecting pipe 211 again. Under the action of the fan blade 205, the first rotating pipe 202 rotates. The hot air comes into uniform contact with the liquid distribution pipe in the connecting pipe and is cooled down quickly. The temperature of each part is uniform. After passing through the air distribution pipe and the air concentrator 15 in sequence, it is discharged from the outlet pipe 14, avoiding the situation where the inlet air temperature of the air-cooled heat pump is uneven in all places. Example 2 Because in areas with high inlet air temperatures, the refrigerant may not condense completely and will remain partially in a gaseous state, while in areas with low inlet air temperatures, the refrigerant may be overcooled. This results in uneven refrigerant distribution within the system, affecting the evaporation process in the evaporator and reducing its heat exchange efficiency. To address this issue, refer to... Figures 1-6The air intake mechanism 3 includes two sets of support pipes 301 fixedly installed on the cooling rack 1. Each set of support pipes 301 is fixedly installed with a second bearing 302 to facilitate the rotation of the second rotating pipe 303. The air intake mechanism 3 also includes a second rotating pipe 303 fixedly installed on the second bearing 302. A fan 304 is fixedly installed on the second rotating pipe 303. The air intake mechanism 3 also includes an outer sprocket 305 fixedly installed on the first rotating pipe 202 and the second rotating pipe 303. A chain 306 is wound on the outer sprocket 305. The wheel 305 is connected by a chain 306. Under the action of the outer wheel 305 and the chain 306, the first rotating tube 202 rotates, driving the second rotating tube 303 to rotate. The rotation of the second rotating tube 303 drives the fan 304 to rotate. Since the temperature of the connecting pipe near the air inlet pipe 12 is relatively high, the fan 304 blows the hot air around the connecting pipe towards the liquid distribution pipe. The refrigerant flowing out through the arc-shaped main pipe 206 and the straight pipe 212 will not be subject to a large temperature difference, so that the refrigerant is evenly distributed in the system, which improves the heat exchange efficiency of the evaporator.

[0023] The temperature-concentrating mechanism 4 includes a concentrating hood 401 fixedly mounted on the cooling rack 1. The concentrating hood 401 has two sets of limiting grooves 402, each set of which is fixedly mounted with two sets of fixing rods 403, making the movement of the limiting block 405 more stable. A reciprocating screw 404 is rotatably mounted on each set of limiting grooves 402, and the reciprocating screw 404 is threadedly connected to the limiting block 405. The temperature-concentrating mechanism 4 also includes a limiting block 405 slidably mounted on the limiting grooves 402, and a concentrating ring 406 fixedly mounted on the limiting block 405. The interior of the concentrating ring 406 is a conical groove, which facilitates the concentration of temperature and air within the concentrating ring 406. Two sets of rotating rods 407 are rotatably mounted on the concentrating hood 401. Two sets of first helical teeth 408 are fixedly installed on the 07. Second helical teeth 409 that mesh with the first helical teeth 408 are fixedly installed on the reciprocating screw 404 and the fan 304. Under the action of the first helical teeth 408 and the second helical teeth 409, the fan 304 rotates and drives the rotating rod 407 to rotate. The rotation of the rotating rod 407 drives the reciprocating screw 404 to rotate within the limiting block 405. This causes the limiting block 405 to drive the air-collecting ring 406 to reciprocate around the first liquid distribution pipe 207 on the air-collecting shroud 401. This allows the air energy blown by the fan to be concentrated on the air-collecting shroud 401 and act on the first liquid distribution pipe 207, thereby enhancing the uniformity of refrigerant cooling in the first liquid distribution pipe 207 and improving the heat exchange efficiency of the evaporator.

[0024] Working principle: After the equipment is connected, hot air passes through the inlet pipe 12 and the air concentrator 15 in sequence, and then enters the first distribution pipe 201 and the second distribution pipe 210 respectively, so that the flow rate is dispersed to facilitate cooling. The hot air then enters the first connecting pipe 203 and the second connecting pipe 211 through the distribution pipes. Under the action of the fan blades 205, the first rotating pipe 202 rotates. The hot air comes into uniform contact with the liquid distribution pipe in the connecting pipe and is rapidly cooled. The temperature of each part is uniform. After passing through the distribution pipes and the air concentrator 15 in sequence, it is discharged from the outlet pipe 14. The outer sprocket 305... Under the action of chain 306, the first rotating tube 202 rotates, driving the second rotating tube 303 to rotate. The second rotating tube 303 rotates, driving the fan 304 to rotate. The fan 304 rotates, driving the rotating rod 407 to rotate. The rotating rod 407 rotates, driving the reciprocating screw 404 to rotate within the limiting block 405. This causes the limiting block 405 to drive the air-collecting ring 406 to reciprocate around the first liquid-distributing tube 207 on the air-collecting cover 401. The refrigerant flowing out through the arc-shaped main pipe 206 and the straight pipe 212 will not be subject to a large temperature difference, thus ensuring that the refrigerant is evenly distributed in the system.

[0025] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An air-cooled heat pump inlet cooling device for air conditioning, comprising a cooling rack (1), characterized in that, A front cover (11) is fixedly installed on the cooling rack (1), an air inlet pipe (12) is fixedly installed on the front cover (11), a rear cover (13) is fixedly installed on the cooling rack (1), an air outlet pipe (14) is fixedly installed on the rear cover (13), and an air concentrator (15) communicating with the air inlet pipe (12) and the air outlet pipe (14) is fixedly installed on both the front cover (11) and the rear cover (13). The air-collecting plate (15) is equipped with a cooling mechanism (2) for cooling hot air; The cooling rack (1) is equipped with an air intake mechanism (3) that ensures uniform distribution of refrigerant in the system. The cooling rack (1) is equipped with a temperature-gathering mechanism (4) to prevent the refrigerant from cooling down too quickly. When hot air enters the cooling mechanism (2) through the air-gathering plate (15), the cooling mechanism (2) drives the air intake mechanism (3) to rotate and simultaneously drives the temperature-gathering mechanism (4) to reciprocate.

2. The air-cooled heat pump inlet cooling device for air conditioning according to claim 1, characterized in that, The cooling mechanism (2) includes two sets of No. 1 air distribution pipes (201) fixedly installed on the air distribution plate (15). A No. 1 connecting pipe (203) is fixedly installed on each set of No. 1 air distribution pipes (201). A No. 1 rotating pipe (202) is rotatably installed between the No. 1 air distribution pipe (201) and the No. 1 connecting pipe (203).

3. The air-cooled heat pump inlet cooling device for air conditioning according to claim 2, characterized in that, The cooling mechanism (2) also includes a bearing (204) fixedly installed on the first air distribution pipe (201) and the first connecting pipe (203), and the bearing (204) is fixedly connected to the first rotating pipe (202), and multiple sets of fan blades (205) are evenly installed on the first rotating pipe (202).

4. The air-cooled heat pump inlet cooling device for air conditioning according to claim 3, characterized in that, The cooling mechanism (2) also includes two sets of arc-shaped main pipes (206) fixedly installed on the cooling rack (1). Two sets of No. 1 liquid distribution pipes (207) are fixedly installed at both ends of the arc-shaped main pipes (206), and the No. 1 liquid distribution pipes (207) are threaded. One end of each of the two sets of No. 1 liquid distribution pipes (207) is fixedly installed with a No. 1 liquid inlet pipe (208), and one end of each of the other two sets of No. 1 liquid distribution pipes (207) is fixedly installed with a No. 1 liquid outlet pipe (209).

5. The air-cooled heat pump inlet cooling device for air conditioning according to claim 4, characterized in that, The cooling mechanism (2) also includes a second air distribution pipe (210) fixedly installed on the air distribution plate (15), and a second connecting pipe (211) is fixedly installed between the two sets of the second air distribution pipes (210).

6. The air-cooled heat pump inlet cooling device for air conditioning according to claim 5, characterized in that, The cooling mechanism (2) also includes a straight pipe (212) fixedly installed on the cooling rack (1). Two sets of No. 2 liquid distribution pipes (213) are fixedly installed at both ends of the straight pipe (212). One end of each set of No. 2 liquid distribution pipes (213) is fixedly installed with a No. 2 liquid inlet pipe (214), and the other two sets of No. 2 liquid distribution pipes (213) are fixedly installed with a No. 2 liquid outlet pipe (215).

7. The air-cooled heat pump inlet cooling device for air conditioning according to claim 2, characterized in that, The air intake mechanism (3) includes two sets of support pipes (301) fixedly installed on the cooling rack (1), and a No. 2 bearing (302) is fixedly installed on each set of support pipes (301).

8. The air-cooled heat pump inlet cooling device for air conditioning according to claim 7, characterized in that, The air intake mechanism (3) also includes a second rotating pipe (303) fixedly installed on the second bearing (302), a fan (304) fixedly installed on the second rotating pipe (303), and an outer sprocket (305) fixedly installed on both the first rotating pipe (202) and the second rotating pipe (303), with a chain (306) wound on the outer sprocket (305).

9. The air-cooled heat pump inlet cooling device for air conditioning according to claim 8, characterized in that, The temperature gathering mechanism (4) includes a wind gathering hood (401) fixedly installed on the cooling rack (1). The wind gathering hood (401) has two sets of limiting grooves (402). Each set of limiting grooves (402) has two sets of fixing rods (403) fixedly installed on each set of limiting grooves (402). Each set of limiting grooves (402) has a reciprocating screw (404) rotatably installed on each set of limiting grooves (402).

10. The air-cooled heat pump inlet cooling device for air conditioning according to claim 9, characterized in that, The temperature-gathering mechanism (4) also includes a limiting block (405) that is slidably installed on the limiting groove (402). A wind-gathering ring (406) is fixedly installed on the limiting block (405). Two sets of rotating rods (407) are rotatably installed on the wind-gathering cover (401). Two sets of first helical teeth (408) are fixedly installed on each set of rotating rods (407). Second helical teeth (409) that mesh with the first helical teeth (408) are fixedly installed on the reciprocating screw (404) and the fan (304).