Sealed phase change heat exchanger structure for guiding liquid through capillary wick

Abstract

The invention discloses a sealed phase change heat exchanger structure for guiding liquid through a capillary wick, and belongs to the technical field of phase change heat exchangers, the sealed phase change heat exchanger structure comprises a machine body, a hot air pipe and a cold air pipe, the hot air pipe and the cold air pipe are installed on the two sides of the machine body in a sealed mode, heat pipes are connected to the inner ends of the hot air pipe and the cold air pipe in a sealed mode, and a row of cooling fins are correspondingly arranged on the side, close to the machine body, of a fan. And one row of radiating fins are arranged on the outer side surface of the machine body. According to the sealed phase change heat exchanger structure for guiding liquid through the capillary wick, the movable frames are arranged, the driving motor is started to drive the two rotating shafts to rotate through the two transmission belts at the same time, and then the two rotating shafts drive the two reciprocating lead screws through the two bevel gear sets at the same time to drive the two movable frames to move in a reciprocating mode; at the moment, a row of cleaning fins arranged on the inner sides of the two movable frames can conduct reciprocating movement cleaning on a row of cooling fins, and it can be avoided that external dust and impurities adhere to the surfaces of the cooling fins, and the later cooling efficiency is affected.

Description

Technical Field

[0001] This invention relates to the field of phase change heat exchanger technology, specifically to a sealed phase change heat exchanger structure that utilizes a capillary wick to guide the liquid. Background Technology

[0002] Compressed air energy storage motors are the core power equipment in compressed air energy storage systems. They are mainly used to drive compressors to compress and store air, or to drive expanders to generate electricity during the discharge phase. Through the conversion between electrical energy and the potential energy of compressed air, large-scale, long-cycle energy storage and release are achieved. Sealed phase change heat exchangers are high-efficiency heat exchange devices based on the principle of phase change heat transfer. Their core lies in achieving efficient heat transfer through the phase change of the working fluid within a closed system (such as the conversion between liquid and gas), while ensuring complete isolation between the system and the outside world. During the use of sealed phase change heat exchangers, for example, in the Chinese patent application with application number CN201620873284.X, filed on August 13, 2016, in a heat pipe type electrically heated phase change energy storage heat exchanger, the... The phase change energy storage heat exchanger shell, phase change energy storage material, heat transfer oil, heat pipe and electric heating device store and release heat. After the heat pipe is arranged, its high-efficiency heat conduction performance is utilized to achieve that the heat extraction fluid, electric heating device and heat transfer oil do not come into contact with each other. All three can exchange heat with the phase change energy storage material. While achieving high-efficiency heat exchange, the structure of the heat extraction fluid flow channel can be changed as needed. There is also a Chinese patent application with application number CN201520533619.9 and application date of 2015-07-22, which describes a multifunctional energy-saving heat pipe phase change heat storage heat exchanger. In this case, heat pipes are used as heating elements and annular fins are added to the flue gas section to heat cold water. This allows it to not only have the general functions of heat storage and heat release, but also the function of simultaneous heat extraction and release.

[0003] While existing technologies can achieve efficient heat dissipation in phase change heat exchangers, dust and impurities from the outside world tend to adhere to the surface of the heat dissipation fins during actual use. This can affect the heat dissipation efficiency of the fins and thus the practicality of the heat dissipation. Therefore, a sealed phase change heat exchanger structure using a capillary wick to guide the liquid is proposed to address the aforementioned problems. Summary of the Invention

[0004] The purpose of this invention is to provide a sealed phase change heat exchanger structure that utilizes a capillary wick to guide liquid, thereby solving the problem mentioned in the background art that the surface of the heat dissipation fins of current phase change heat exchangers on the market will stick to external dust and impurities, which will affect the heat dissipation efficiency of the heat dissipation fins for the phase change heat exchanger and thus affect the practicality of the heat dissipation fins.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a sealed phase change heat exchanger structure utilizing a capillary wick for liquid guiding, comprising a body, and hot air pipes and cold air pipes sealed and installed on both sides of the body, wherein the inner ends of the hot air pipes and cold air pipes are sealed and connected to heat pipes, and the heat pipes are disposed inside the body, with a wick disposed on the outer side of the heat pipes, a partition installed inside the body, and the partition is fixedly connected to the body by a row of shape memory alloy springs, and a thermoelectric generator disposed on the outer side of the partition, a rotor disposed inside the body, and a refrigerant placed inside the body, a protective frame screwed on the left side of the body, and a drive motor fixedly installed on the outer side of the protective frame, with a fan connected to the output end of the drive motor, wherein the fan is disposed inside the protective frame, and a row of heat dissipation fins is correspondingly disposed on the side of the fan near the body, one row of heat dissipation fins being disposed on the outer side of the body.

[0006] Preferably, two movable frames are slidably mounted on the left side of the fuselage, and the two movable frames are symmetrically arranged about the transverse center line of the fuselage, and a row of cleaning fins is provided on the inner side of the two movable frames.

[0007] Preferably, the cleaning fins in a row are equally spaced, and the cleaning fins and the heat dissipation fins in a row are fitted and staggered.

[0008] Preferably, two reciprocating lead screws are rotatably mounted on the outer side of the machine body, and a movable frame is threaded through the outer side of the two reciprocating lead screws. The outer ends of the two reciprocating lead screws are connected to a rotating shaft through a bevel gear set.

[0009] Preferably, the two rotating shafts are rotatably mounted inside the protective frame, and the two rotating shafts are connected to the output end of the drive motor via a transmission belt.

[0010] Preferably, a steel air pipe is rotatably mounted on the front side of the left-end movable frame, and a row of air nozzles is installed at equal intervals on the outer side of the steel air pipe. The steel air pipe is sealed to a pump body assembly through a hose, wherein the pump body assembly is located on the rear side of the machine body.

[0011] Preferably, a rotating rod is rotatably mounted on the front side of the right-end movable frame, and a row of dust collection discs are evenly spaced on the outer side of the rotating rod. The rotating rod is sealed to a storage box via a flexible hose, and the storage box is located on the front side of the machine body.

[0012] Preferably, a connecting plate is installed above the rotating rod and the steel air pipe, and a first magnet is installed on the rear side of the two connecting plates, and a second magnet is correspondingly installed on the rear side of the two first magnets. A row of second magnets is arranged at equal intervals on the outer side of the body, wherein the magnetic poles of the first magnets and the second magnets are the same.

[0013] Preferably, the protective frame has a first ventilation hole at the top and a second ventilation hole at the bottom. An installation frame is installed inside the protective frame, and a fan is located on the inner side of the installation frame. Two negative pressure plates are slidably installed inside the protective frame, and the top of the two negative pressure plates has a first ventilation hole.

[0014] Preferably, there is an eccentric wheel below the two negative pressure plates, and the two eccentric wheels are installed through the outer side of the two rotating shafts. A second electromagnet is installed inside the two eccentric wheels, and a first electromagnet is installed above the two second electromagnets. The two first electromagnets are installed below the two negative pressure plates, and the first electromagnets and the second electromagnets have the same magnetic poles.

[0015] Compared with the prior art, the beneficial effects of the present invention are: Equipped with movable frames, two of which are slidably mounted on the outside of the unit, the phase changer heat exchanger can be used for heat dissipation. Simply start the drive motor, which drives two shafts via two transmission belts. The two shafts then drive two reciprocating screws via two bevel gear sets, causing the two movable frames to move back and forth. During this process, a row of cleaning fins on the inner side of the two movable frames will clean the heat dissipation fins, preventing external dust and impurities from sticking to the surface of the heat dissipation fins and affecting the subsequent heat dissipation efficiency, thus improving practicality.

[0016] Furthermore, while the two moving frames drive the two rows of cleaning fins to reciprocate and clean the row of heat dissipation fins, the steel air pipe on the left moving frame will drive a row of air jets to blow air onto the row of heat dissipation fins to clean them. This prevents dust and impurities from sticking to the surface of the row of heat dissipation fins and affecting subsequent heat dissipation treatment, thus improving the efficiency of cleaning dust and impurities from the row of heat dissipation fins.

[0017] Furthermore, as the two moving frames drive the two rows of cleaning fins to reciprocate and clean the row of heat dissipation fins, the rotating rod on the right moving frame will drive a row of dust collection discs to collect dust from the cleaned heat dissipation fins, preventing dust and impurities from accumulating inside the protective frame and affecting the heat dissipation efficiency of the row of heat dissipation fins later, thus improving the cleaning effect of the row of heat dissipation fins.

[0018] The system is equipped with connecting plates, which are installed above the steel air pipe and the rotating rod. A first magnet is installed on the rear side of the two connecting plates. When the two moving frames drive the two rows of cleaning fins to clean back and forth, the first magnets on the rear side of the two connecting plates will simultaneously drive the two rows of second magnets to swing back and forth through the torsion springs by the principle of magnetic repulsion between like poles. This can expand the cleaning and collection effect of the row of air nozzles and the row of dust collection plates.

[0019] The system is equipped with negative pressure plates. Two negative pressure plates are slidably installed inside the protective frame. Eccentric wheels are installed through the outer sides of the two rotating shafts. As the two shafts drive the two eccentric wheels to rotate, they squeeze and beat the two negative pressure plates. At this time, the second electromagnets installed inside the two eccentric wheels will expand the movement range of the two negative pressure plates through the principle of magnetic repulsion between like poles. Thus, the two squeezing and lifting negative pressure plates can accelerate the air flow inside the protective frame, allowing the air inside the protective frame to be discharged quickly. This better assists the fan in dissipating heat from the row of heat sink fins, improving its practicality. Attached Figure Description

[0020] Figure 1 This is a frontal three-dimensional structural diagram of the present invention; Figure 2 This is a side view of the three-dimensional structure of the present invention; Figure 3 This is a three-dimensional structural diagram of the present invention after the fuselage and protective frame are separated; Figure 4 This is a partial three-dimensional structural diagram of the fuselage and heat dissipation fins of the present invention; Figure 5 This is a partial three-dimensional structural diagram of the movable frame and cleaning fins of the present invention; Figure 6 For the present invention Figure 4 Enlarged structural diagram at point A in the middle; Figure 7 This is a schematic diagram of the three-dimensional structure of the movable frame and cleaning fins after they have been moved according to the present invention. Figure 8 For the present invention Figure 7 Enlarged structural diagram at point B; Figure 9 This is a partial three-dimensional structural diagram of the protective frame and eccentric wheel of the present invention; Figure 10 This is a three-dimensional structural diagram of the protective frame and eccentric wheel of the present invention, viewed from below.

[0021] In the diagram: 1. Body; 2. Hot air duct; 3. Cold air duct; 4. Heat pipe; 5. Liquid suction core; 6. Thermoelectric generator; 7. Memory alloy spring; 8. Partition plate; 9. First electromagnet; 10. Rotor; 11. Protective frame; 12. First vent; 13. Storage bin; 14. Pump assembly; 15. Drive motor; 16. Heat dissipation fins; 17. Rotating shaft; 18. Bevel gear set; 19. Reciprocating screw; 20. Steel air pipe; 21. Air nozzle; 22. Moving frame; 23. Rotating rod; 24. Dust suction tray; 25. Cleaning fins; 26. Connecting tray; 27. First magnet; 28. Second magnet; 29. ​​Torsion spring; 30. Second vent; 31. Fan; 32. Drive belt; 33. Negative pressure plate; 34. Mounting frame; 35. Eccentric wheel; 36. Second electromagnet. Detailed Implementation

[0022] 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.

[0023] This invention provides the following technical solution: a sealed phase change heat exchanger structure utilizing a capillary wick for liquid conduction. Example 1: To address the problem that dust and impurities adhere to the surface of the heat dissipation fins 16 in existing phase change heat exchangers, affecting their heat dissipation efficiency and overall practicality, the following solution is disclosed: a housing 1, and hot air ducts 2 and cold air ducts 3 sealed on both sides of the housing 1. The inner ends of the hot air ducts 2 and 3 are sealed with heat pipes 4, which are located inside the housing 1. A liquid-absorbing core 5 is located on the outer side of the heat pipes 4. A partition 8 is installed inside the housing 1, and the partition 8 is fixedly connected to the housing 1 by a row of shape memory alloy springs 7. A thermoelectric generator 6 is located on the outer side of the partition 8. Figure 1 and Figure 2 As shown, the casing 1 also contains a rotor 10, and refrigerant is placed inside the casing 1. A protective frame 11 is screwed onto the left side of the casing 1, and a drive motor 15 is fixedly mounted on the outer side of the protective frame 11. The output end of the drive motor 15 is connected to a fan 31, which is located inside the protective frame 11. A row of heat dissipation fins 16 is located on the side of the fan 31 closest to the casing 1, and one row of heat dissipation fins 16 is located on the outer side of the casing 1. Figure 3 As shown.

[0024] Two movable frames 22 are slidably mounted on the left side of the fuselage 1, and the two movable frames 22 are symmetrically arranged about the transverse centerline of the fuselage 1. A row of cleaning fins 25 is provided on the inner side of the two movable frames 22. Figure 4 As shown, a row of cleaning fins 25 are evenly spaced, and the row of cleaning fins 25 and a row of heat dissipation fins 16 are fitted and staggered. Two reciprocating screws 19 are rotatably mounted on the outer side of the body 1, and a movable frame 22 is threaded through the outer side of the two reciprocating screws 19. The outer ends of the two reciprocating screws 19 are meshed with a rotating shaft 17 through a bevel gear set 18. The two rotating shafts 17 are rotatably mounted inside the protective frame 11, and the output end of the drive motor 15 is connected to the two rotating shafts 17 through a transmission belt 32. Figure 9 and Figure 10 As shown.

[0025] External hot air is delivered into the interior of the unit 1 through hot air duct 2, such as Figure 1 and Figure 2 As shown, the refrigerant absorbs heat to cool the air, converting the hot air into cold air, which is then discharged through the cold air duct 3. Inside the sealed cavity of the unit 1, a vacuum is created to lower the boiling point of the refrigerant, while the cavity itself contains refrigerant to maintain a low temperature on one side of the thermoelectric generator 6, thus enabling the thermoelectric generator 6 to generate electricity normally. Figure 3 As shown, the heat dissipation effect is optimized. At the same time, the heat pipe 4 is covered with a liquid wick 5, which has capillary properties. The liquid working fluid can climb along the liquid wick 5, thus optimizing the heat dissipation effect of the heat pipe 4.

[0026] When the phase change heat exchanger is used for heat dissipation, simply start the drive motor 15, which drives two rotating shafts 17 to rotate simultaneously via two transmission belts 32. Then, the two rotating shafts 17, through two bevel gear sets 18, drive two reciprocating screws 19 to move two moving frames 22 back and forth. At this time, a row of cleaning fins 25 located inside the two moving frames 22 will clean the row of heat dissipation fins 16 through the reciprocating movement. Figure 4 , Figure 5 and Figure 7 As shown, this avoids external dust and impurities from sticking to the surface of the heat dissipation fins 16 and affecting the subsequent heat dissipation efficiency, thus improving the heat dissipation efficiency of the heat dissipation fins 16 on the body 1.

[0027] Example 2 differs from Example 1 in that a row of air jets 21 is used to blow away dust and impurities from the surface of the heat dissipation fins 16 after cleaning, and then a row of dust collection discs 24 is used to adsorb and collect the cleaned dust and impurities. This prevents dust and impurities from sticking to the surface of the heat dissipation fins 16 and affecting the heat dissipation efficiency of the phase change heat exchanger. The following is disclosed: A steel air pipe 20 is rotatably mounted on the front side of the left-end movable frame 22, and a row of air nozzles 21 are evenly spaced on the outer side of the steel air pipe 20. The steel air pipe 20 is sealed to the pump body assembly 14 through a hose. Figure 5 As shown, the pump body assembly 14 is located on the rear side of the machine body 1. A rotating rod 23 is rotatably mounted on the front side of the right-end movable frame 22, and a row of dust suction discs 24 are evenly spaced on the outer side of the rotating rod 23. The rotating rod 23 is sealed to a storage box 13 via a flexible hose, and the storage box 13 is located on the front side of the machine body 1. Figure 7 As shown, a connecting plate 26 is installed above the rotating rod 23 and the steel air pipe 20, and a first magnet 27 is installed on the rear side of the two connecting plates 26, and a second magnet 28 is correspondingly installed on the rear side of the two first magnets 27, as shown. Figure 6 and Figure 8 As shown, a row of second magnets 28 are arranged at equal intervals on the outer side of the fuselage 1, wherein the magnetic poles of the first magnet 27 and the second magnet 28 are the same.

[0028] When the two movable frames 22 drive the two rows of cleaning fins 25 to reciprocate and clean the row of heat dissipation fins 16, the steel air pipe 20 installed on the left movable frame 22 will drive a row of air jets 21 to blow air and clean the row of heat dissipation fins 16. Figure 4 and Figure 5 As shown, to prevent dust and impurities from adhering to the surface of the row of heat dissipation fins 16 and affecting subsequent heat dissipation, the cleaning efficiency of the row of heat dissipation fins 16 is improved. When the two moving frames 22 drive the two rows of cleaning fins 25 to reciprocate and clean the row of heat dissipation fins 16, the rotating rod 23 set on the right moving frame 22 will drive a row of dust collection discs 24 to collect the dust from the cleaned heat dissipation fins 16. Figure 7 As shown, this avoids dust and impurities accumulating inside the protective frame 11, which would affect the heat dissipation efficiency of the row of heat dissipation fins 16 and improve the cleaning effect of the row of heat dissipation fins 16.

[0029] When the two movable frames 22 drive the two rows of cleaning fins 25 to reciprocate, they simultaneously drive the first magnet 27 located on the rear side of the two connecting plates 26 to reciprocate with the two rows of second magnets 28 through the principle of magnetic repulsion between like poles. This causes the steel air pipe 20 and the rotating rod 23 to reciprocate through the torsion spring 29. Figure 6 and Figure 8 As shown, this can enhance the cleaning and collection effect of a row of jet nozzles 21 and a row of dust collection discs 24, thereby improving the heat dissipation efficiency of a row of heat dissipation fins 16 on the body 1.

[0030] Example 3, unlike Example 2, uses a reciprocatingly moving negative pressure plate 33 to accelerate the flow rate of gas inside the protective frame 11, thereby improving the heat dissipation efficiency of the phase change heat exchanger. The following is disclosed: A first vent 12 is provided at the top of the protective frame 11, and a second vent 30 is provided at the bottom of the protective frame 11, such as... Figure 9 As shown, a mounting frame 34 is installed inside the protective frame 11, and a fan 31 is located on the inner side of the mounting frame 34. Two negative pressure plates 33 are slidably installed inside the protective frame 11, and a first vent 12 is located above the two negative pressure plates 33. An eccentric wheel 35 is located below the two negative pressure plates 33, and the two eccentric wheels 35 are installed through the outer sides of the two rotating shafts 17. A second electromagnet 36 is installed inside the two eccentric wheels 35, and a first electromagnet 9 is located above the two second electromagnets 36. The two first electromagnets 9 are installed below the two negative pressure plates 33, and the first electromagnets 9 and the second electromagnets 36 have the same magnetic poles. Figure 10 As shown.

[0031] While the two rotating shafts 17 drive the two eccentric wheels 35 to rotate, they simultaneously squeeze and beat the two negative pressure plates 33, causing them to move. At this time, the second electromagnets 36 installed inside the two eccentric wheels 35 will expand the movement range of the two negative pressure plates 33 through the principle of magnetic repulsion between like poles of the magnetic field and the two first electromagnets 9. Figure 9 and Figure 10 As shown, the two negative pressure plates 33 that move up and down can accelerate the flow of gas inside the protective frame 11, allowing the gas inside the protective frame 11 to be discharged quickly, which better assists the fan 31 in cooling the row of heat dissipation fins 16, making it more practical and thus completing a series of tasks.

[0032] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0033] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sealed phase change heat exchanger structure using capillary wick to guide liquid, comprising a body (1), and hot air pipe (2) and cold air pipe (3) sealedly installed on both sides of the body (1), and the inner ends of the hot air pipe (2) and the cold air pipe (3) are connected with a heat pipe (4), and the heat pipe (4) is arranged in the interior of the body (1), and the outer side of the heat pipe (4) is provided with a wick (5); Characterized in that: The interior of the body (1) is provided with a partition plate (8), and the partition plate (8) is fixedly connected with the body (1) through a row of memory alloy springs (7), and the outer side of the partition plate (8) is provided with a thermoelectric generator (6), and the interior of the body (1) is further provided with a rotor (10), and the interior of the body (1) is placed with a refrigerant; The left side of the body (1) is screw-mounted with a protective frame (11), and the outer side of the protective frame (11) is fixedly mounted with a driving motor (15), and the output end of the driving motor (15) is connected with a fan (31), wherein the fan (31) is arranged in the interior of the protective frame (11), and the side of the fan (31) close to the body (1) corresponds to a row of heat dissipation fins (16), wherein the row of heat dissipation fins (16) is arranged on the outer side of the body (1).

2. The sealed phase change heat exchanger structure using a capillary wick to guide liquid according to claim 1, characterized in that: The left side of the body (1) is slidingly mounted with two moving frames (22), and the two moving frames (22) are symmetrically arranged about the transverse center line of the body (1), and the inner side of the two moving frames (22) is provided with a row of cleaning fins (25).

3. The sealed phase change heat exchanger structure using a capillary wick to guide liquid according to claim 2, characterized in that: The row of cleaning fins (25) is arranged at equal intervals, and the row of cleaning fins (25) and the row of heat dissipation fins (16) are arranged in close contact and staggered.

4. The sealed phase change heat exchanger structure using a capillary wick to conduct liquid according to claim 1, wherein: The outer side of the body (1) is rotatably mounted with two reciprocating lead screws (19), and the outer side of the two reciprocating lead screws (19) is threadedly penetrated and connected with the moving frame (22), and the outer ends of the two reciprocating lead screws (19) are meshingly connected with the rotating shaft (17) through the bevel gear set (18).

5. The sealed phase change heat exchanger structure using a capillary wick to conduct liquid according to claim 4, wherein: The two rotating shafts (17) are rotatably mounted in the interior of the protective frame (11), and the two rotating shafts (17) are connected with the output end of the driving motor (15) through the transmission belt (32).

6. The sealed phase change heat exchanger structure using a capillary wick to conduct liquid according to claim 4, wherein: The front side of the left end moving frame (22) is rotatably mounted with a steel air pipe (20), and a row of air jet nozzles (21) is mounted at equal intervals on the outer side of the steel air pipe (20), and the steel air pipe (20) is sealingly connected with a pump body assembly (14) through a hose, wherein the pump body assembly (14) is arranged on the rear side of the body (1).

7. The sealed phase change heat exchanger structure using a capillary wick to conduct liquid according to claim 6, wherein: The front side of the right end moving frame (22) is rotatably mounted with a rotating rod (23), and a row of dust suction discs (24) is mounted at equal intervals on the outer side of the rotating rod (23), and the rotating rod (23) is sealingly connected with a storage tank (13) through a hose, and the storage tank (13) is arranged on the front side of the body (1).

8. The sealed phase change heat exchanger structure using a capillary wick to conduct liquid according to claim 7, wherein: The connecting disc (26) is arranged on the upper side of the steel trachea (20), the first magnet (27) is arranged on the rear side of the connecting disc (26), the second magnet (28) is arranged on the rear side of the first magnet (27), a row of second magnets (28) are arranged on the outer side of the fuselage (1) at equal intervals, and the magnetic poles of the first magnet (27) and the second magnet (28) are the same.

9. The sealed phase change heat exchanger structure using a capillary wick to conduct liquid according to claim 1, wherein: The first air hole (12) is arranged on the upper side of the protection frame (11), the second air hole (30) is arranged on the lower side of the protection frame (11), the mounting frame (34) is arranged in the protection frame (11), the fan (31) is arranged on the inner side of the mounting frame (34), the two negative pressure plates (33) are slidably arranged in the protection frame (11), and the first air hole (12) is arranged on the upper side of the two negative pressure plates (33).

10. The sealed phase change heat exchanger structure using a capillary wick to conduct liquid according to claim 9, wherein: The eccentric wheel (35) is arranged on the lower side of the two negative pressure plates (33) and penetrates the outer side of the rotating shaft (17), the second electromagnet (36) is arranged in the eccentric wheel (35), the first electromagnet (9) is arranged on the upper side of the two second electromagnets (36), the first electromagnet (9) is arranged on the lower side of the two negative pressure plates (33), and the magnetic poles of the first electromagnet (9) and the second electromagnet (36) are the same.

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