Heat-conducting and electric-conducting shielding silicone rubber composite material and preparation method thereof

Abstract

The invention discloses a heat-conducting and electric-conducting shielding silicon rubber composite material and a preparation method thereof, and the heat-conducting and electric-conducting shielding silicon rubber composite material comprises the following raw materials in parts by weight: 180-220 parts of silicon rubber; 80 to 120 parts of multi-layer composite metal silver; 20-80 parts of a heat-conducting insulating filler; 8 to 10 parts of fumed silica; 8 to 15 parts of a coupling agent; 0.5 to 1 part of a cross-linking agent; 0.5 to 2 parts of a vulcanizing agent; and 0.5-1 part of a release agent. The multilayer composite metal silver comprises silver powder, the surface of the silver powder is plated with metal nickel, and the surface of the metal nickel is plated with graphene; boron nitride is adopted as the heat-conducting insulating filler, so that the electric conduction and heat conduction properties of the filler are ensured, and the filler is ensured to have very good corrosion resistance; boron nitride is adopted as the heat-conducting insulating filler, electromagnetic waves are absorbed through dielectric loss, and reflection is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of shielding silicone rubber, and specifically to a thermally conductive, electrically conductive shielding silicone rubber composite material and a preparation method thereof. Background Art

[0002] As a highly reliable elastomer material, silicone rubber is widely used in high-tech fields such as aerospace and military equipment due to its excellent high and low temperature resistance, radiation resistance, aging resistance, and chemical corrosion resistance. However, with the rapid development of technology, the usage environment of silicone rubber has become increasingly complex and diverse. To resist harsher usage environments and meet the requirements of more scenarios, silicone rubber is developing towards high performance (excellent mechanical, electrical conductivity, thermal conductivity, electromagnetic interference shielding performance, etc.). The production of silicone rubber composites requires uniform dispersion of the multi-phase system through mixing and stirring.

[0003] Search for a Chinese patent on a casting and foaming silicone rubber mixing device (Publication No.: CN218573475U). This patented technology includes a vehicle body and universal wheels at the four corners of the bottom surface of the vehicle body. Its characteristics are that a built-in box is embedded in the center of the upper surface of the vehicle body, a left and right rotating shaft is rotatably arranged in the center of the built-in box through a bearing, a mixing box is fixedly arranged at the top of the rotating shaft, a driven gear is fixedly arranged at the bottom of the rotating shaft, a first motor is fixedly arranged on the right side of the bottom surface of the vehicle body, and a driving gear is fixedly arranged at the output end of the first motor; in the present invention, the first motor drives the driving gear to rotate, the driving gear drives the driven gear to rotate, so that the rotating shaft rotates, and the rotating shaft drives the mixing box to rotate, achieving the effect of shaking the mixing box. Moreover, when the rotating shaft drives the mixing box to rotate, it rotates around the right side of the bottom of the mixing box, so that the shaking direction of the mixing box is not limited to left and right shaking, making the mixing effect of the materials in the mixing box better.

[0004] For existing silicone rubber composites, their thermal conductivity, electrical conductivity, and shielding performance are relatively poor; also, during the process of mixing and stirring the raw materials of silicone rubber composites, the feeding end is open, which will cause gas to accumulate inside the raw materials, and bubbles will be generated inside the product after mixing. The bubbles cause voids in the finished product, affecting the dielectric properties and the quality of the product. Therefore, we propose a thermally conductive, electrically conductive shielding silicone rubber composite material and a preparation method thereof to solve the existing problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a thermally conductive, electrically conductive shielding silicone rubber composite material and a preparation method thereof to solve the problems in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solution: A thermally conductive, electrically conductive, and shielding silicone rubber composite material, comprising the following raw materials in parts by weight: silicone rubber, 180 - 220 parts; multi-layer composite metal silver, 80 - 120 parts; thermally conductive and insulating filler, 20 - 80 parts; fumed silica, 8 - 10 parts; coupling agent, 8 - 15 parts; cross-linking agent, 0.5 - 1 part; vulcanizing agent, 0.5 - 2 parts; mold release agent, 0.5 - 1 part.

[0007] Preferably, the multi-layer composite metal silver comprises silver powder, the surface of the silver powder is plated with metallic nickel, and the surface of the metallic nickel is plated with graphene; the thermally conductive and insulating filler is boron nitride, and the cross-linking agent is low-viscosity linear methyl hydrogen silicone oil.

[0008] A preparation method of a thermally conductive, electrically conductive, and shielding silicone rubber composite material, comprising the following steps:

[0009] S1. Weigh the required amounts of raw materials according to the formula.

[0010] S2. React the conductive filler and part of the coupling agent to form a modified conductive filler; react the thermally conductive and insulating filler and part of the coupling agent to form a modified thermally conductive and insulating filler.

[0011] S3. React the fumed silica and the remaining coupling agent to form a modified fumed silica.

[0012] S4. Knead the silicone rubber, modified fumed silica, modified conductive filler, modified thermally conductive and insulating filler, and vulcanizing agent to obtain a kneaded rubber.

[0013] S5. Uniformly mix the kneaded rubber through a mixer.

[0014] S6. Vulcanize the kneaded rubber, vulcanizing agent, and mold release agent. The vulcanization temperature is 80 - 150 °C, and the vulcanization time is 20 - 50 min.

[0015] Preferably, the mixer comprises a barrel body, a motor, a rotating shaft, and a pump housing. The motor is arranged at the upper end of the barrel body. The lower end of the motor is provided with a rotating shaft rotatably installed inside the barrel body. Multiple groups of stirring rods are arranged in an annular array on the outer wall of the rotating shaft. The pump housing is arranged at the upper end of the barrel body. The suction end of the pump housing penetrates through the upper end inside of the barrel body. A pump shaft is rotatably installed inside the pump housing. An impeller rotatably installed inside the pump housing is sleeved on the outer wall of the pump shaft. A driving wheel is sleeved on the outer wall of the rotating shaft. A driven wheel is sleeved on the outer wall of the pump shaft. Belts are sleeved on the outer walls of the driving wheel and the driven wheel. An air outlet pipe is arranged at the output end of the pump housing.

[0016] Preferably, a valve ring is arranged inside the air outlet pipe, a valve core is arranged inside the valve ring, the valve core is conical, and a spring is arranged at one end of the valve core; side air holes which are located on one side of the valve core and are distributed in an annular array are formed inside the air outlet pipe, a valve seat in an annular shape is arranged inside the air outlet holes, and one end of the spring is connected with the valve seat.

[0017] Preferably, a feed pipe is arranged at the upper end of the barrel body, and a support frame is sleeved on the outer wall of the barrel body; a valve is arranged inside the feed pipe, and a feed hopper is arranged at the upper end of the feed pipe.

[0018] Preferably, a discharge pipe is arranged at the lower end of the barrel body, a valve is arranged inside the discharge pipe, and a diversion hopper is arranged on the inner wall at the lower end of the barrel body; the radius specification of the driving wheel is larger than that of the driven wheel, and a filter element is arranged at the suction end of the pump housing.

[0019] Preferably, a plurality of first bevel gears are sleeved on the outer wall of the rotating shaft at equal intervals, a plurality of second bevel gears distributed in an annular array are meshed and installed on the outer sides of the first bevel gears, a driven shaft is arranged at one end of each second bevel gear, and stirring blades distributed in an annular array are arranged on the outer walls of the driven shafts; fixing boxes which are rotationally installed with the rotating shaft are sleeved on the outer sides of the first bevel gears and the second bevel gears, and support rods which are distributed in an annular array and are connected with the inner wall of the barrel body are arranged on the outer walls of the fixing boxes.

[0020] Preferably, the fixing box is integrally spherical with a hollow interior, sealing bearings distributed in an annular array are embedded and installed inside the fixing box, and one end of the driven shaft is rotationally installed inside the sealing bearings.

[0021] Preferably, a plurality of ventilation holes are distributed at equal intervals in an annular shape at the bottom of the barrel body, a first guiding structure is arranged on one side of the through holes, a second guiding structure is arranged on the other side of the through holes, a third guiding structure is arranged above the second guiding structure, the first guiding structure and the second guiding structure are both arc-shaped structures, and the third guiding structure is an inclined structure; the motor adopts a hollow shaft motor, the inside of the rotating shaft is a hollow structure, a communication hole is formed in the rotating shaft at the position of the fixing box, and a plurality of micropores are evenly formed between the stirring blades on the driven shaft.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. The multi-layer composite metal silver comprises silver powder, the surface of the silver powder is plated with metallic nickel, and the surface of the metallic nickel is plated with graphene; the heat-conducting and insulating filler adopts boron nitride, which ensures the electrical conductivity and heat-conductivity performance of the filler and also ensures that the filler has good corrosion resistance. The heat-conducting and insulating filler adopts boron nitride, which absorbs electromagnetic waves through dielectric loss and reduces reflection.

[0024] 2. The motor drives the shaft to rotate, driving the stirring rod to stir and mix the silicone rubber composite material inside the barrel. During the mixing process, the pump shaft is linked by a belt to drive the impeller to rotate inside the pump casing, and the suction force generated acts on the inside of the barrel to suck out the gas generated during the mixing process of the silicone rubber composite material, thereby avoiding the generation of bubbles inside the silicone rubber composite material, which in turn affects the quality of the silicone rubber composite material after processing. The negative pressure device does not require the use of additional power equipment, thereby reducing the cost of use.

[0025] 3. A plurality of air holes are evenly distributed in a circular shape at the bottom of the barrel body. A first guide structure is arranged on one side of the through hole, a second guide structure is arranged on the other side of the through hole, and a third guide structure is arranged above the second guide structure. The first guide structure and the second guide structure are both arc-shaped structures, and the third guide structure is an inclined structure. The through hole needs to be connected to an external air supply device. The combination of the guide structures can make the gas diffuse along the edge of the barrel body, thereby reducing the possibility of the barrel arm sticking to the material; the motor adopts a hollow shaft motor, the interior of the rotating shaft is a hollow structure, the rotating shaft is located at the fixed box with a connecting hole, and the driven shaft is located between the stirring blades with a plurality of micro holes evenly opened. By connecting the rotating shaft to an external air supply device, the gas can be discharged from the micro holes, and the rotation of the stirring blades can greatly reduce the possibility of the blades sticking to the material, thereby improving the stirring and mixing effect; the internal gas generates suction force through the rotation of the impeller, and the gas generated during the mixing process is extracted in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 It is a schematic diagram of the main stereoscopic structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the internal three-dimensional structure of the barrel of the present invention;

[0029] Figure 3 It is a schematic diagram of the three-dimensional structure of the motor of the present invention from top view;

[0030] Figure 4 This is a schematic diagram of the three-dimensional structure of the stirring blade of the present invention when viewed from above;

[0031] Figure 5 It is a schematic diagram of the main cross-sectional three-dimensional structure of the exhaust pipe of the present invention;

[0032] Figure 6 It is a cross-sectional view of a part of the barrel of the present invention;

[0033] Figure 7 For the present invention Figure 6 The structural diagram at A in the middle;

[0034] Figure 8 Schematic diagram of the stirring blade structure of the present invention.

[0035] In the figure: 1, barrel body; 2, motor; 3, discharge pipe; 4, support frame; 5, rotating shaft; 6, fixed box; 7, stirring rod; 8, support rod; 9, stirring blade; 10, diversion hopper; 11, feed hopper; 12, valve; 13, feed pipe; 14, driving wheel; 15, driven wheel; 16, belt; 17, impeller; 18, air outlet pipe; 19, valve core; 20, side air holes; 21, valve ring; 22, spring; 23, valve seat; 24, driven shaft; 25, sealing bearing; 26, bevel gear one; 27, bevel gear two; 28, pump shaft; 29, pump casing; 101, ventilation holes; 102, first guiding structure; 103, second guiding structure; 104, third guiding structure; 91, micropores. Specific embodiments

[0036] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the present invention to be protected, but merely represents the selected embodiments of the present invention.

[0037] In an embodiment of the present invention, a thermally conductive, electrically conductive and shielding silicone rubber composite material includes the following raw materials in parts by weight: silicone rubber, 180 - 220 parts; multi-layer composite metal silver, 80 - 120 parts; thermally conductive and insulating filler, 20 - 80 parts; fumed silica, 8 - 10 parts; coupling agent, 8 - 15 parts; cross-linking agent, 0.5 - 1 part; vulcanizing agent, 0.5 - 2 parts; release agent, 0.5 - 1 part.

[0038] Preferably, the multi-layer composite metal silver includes silver powder, the surface of the silver powder is plated with metallic nickel, and the surface of the metallic nickel is plated with graphene; the thermally conductive and insulating filler uses boron nitride. The multi-layer composite metal silver includes silver powder, the surface of the silver powder is plated with metallic nickel, and the surface of the metallic nickel is plated with graphene; the thermally conductive and insulating filler uses boron nitride to ensure the conductive and thermally conductive properties of the filler and ensure that the filler has good corrosion resistance. The thermally conductive and insulating filler uses boron nitride to absorb electromagnetic waves through dielectric loss and reduce reflection; the cross-linking agent uses low-viscosity linear methyl hydrogen silicone oil.

[0039] A preparation method of a thermally conductive, electrically conductive and shielding silicone rubber composite material includes the following steps:

[0040] S1. Weigh the required amounts of raw materials according to the formula.

[0041] S2. React the conductive filler and part of the coupling agent to form a modified conductive filler; react the thermally conductive insulating filler and part of the coupling agent to form a modified thermally conductive insulating filler.

[0042] S3. React the fumed silica and the remaining coupling agent to form a modified fumed silica.

[0043] S4. Knead silicone rubber, modified fumed silica, modified conductive filler, modified thermally conductive insulating filler, and vulcanizing agent to obtain a kneaded rubber.

[0044] S5. Uniformly mix the kneaded rubber through a mixer.

[0045] S6. Vulcanize the kneaded rubber, vulcanizing agent, and mold release agent. The temperature of vulcanization is 80 - 150 °C, and the time of vulcanization is 20 - 50 min.

[0046] As Figures 1-8 shown, the mixer includes a barrel body 1, a motor 2, a rotating shaft 5, and a pump housing 29. A motor 2 is provided at the upper end of the barrel body 1. A rotating shaft 5 rotatably installed inside the barrel body 1 is provided at the lower end of the motor 2. A plurality of groups of stirring rods 7 distributed in an annular array are provided on the outer wall of the rotating shaft 5. A pump housing 29 is provided at the upper end of the barrel body 1. The suction end of the pump housing 29 penetrates through the upper end inside the barrel body 1. A pump shaft 28 rotatably installed inside the pump housing 29 is provided inside the pump housing 29. An impeller 17 rotatably installed inside the pump housing 29 is sleeved on the outer wall of the pump shaft 28. A driving wheel 14 is sleeved on the outer wall of the rotating shaft 5. A driven wheel 15 is sleeved on the outer wall of the pump shaft 28. A belt 16 is sleeved on the outer walls of both the driving wheel 14 and the driven wheel 15. An air outlet pipe 18 is provided at the output end of the pump housing 29

[0047] A valve ring 21 is provided inside the air outlet pipe 18. A valve core 19 is provided inside the valve ring 21. The valve core 19 is conical. A spring 22 is provided at one end of the valve core 19.

[0048] Side air holes 20 distributed in an annular array and located on one side of the valve core 19 are formed inside the air outlet pipe 18. An annular valve seat 23 is provided inside the air outlet holes. One end of the spring 22 is connected to the valve seat 23.

[0049] A feed pipe 13 is provided at the upper end of the barrel body 1. A support frame 4 is sleeved on the outer wall of the barrel body 1.

[0050] A valve 12 is provided inside the feed pipe 13. A feed hopper 11 is provided at the upper end of the feed pipe 13.

[0051] A discharge pipe 3 is provided at the lower end of the barrel body 1. A valve 12 is provided inside the discharge pipe 3. A guide hopper 10 is provided on the inner wall at the lower end of the barrel body 1.

[0052] The radius specification of the driving wheel 14 is larger than that of the driven wheel 15, and a filter element is provided at the suction end of the pump housing 29;

[0053] Based on the implementation steps of Embodiment 1: When using this mixing and stirring device, add the silicone rubber composite material to be mixed into the barrel 1 through the feed pipe 13, close the valve 12 of the feed pipe 13, start the motor 2, the motor 2 drives the rotating shaft 5 to rotate, driving a plurality of stirring rods 7 distributed in an annular array to fully stir and mix the silicone rubber composite material in the barrel 1. During the stirring process, the rotating shaft 5 simultaneously drives the driving wheel 14 to rotate, and through the belt 16, the pump shaft 28 is linked, so that the impeller 17 on the pump shaft 28 rotates at a high speed in the pump housing 29, generating a strong suction force. This suction force acts on the inside of the barrel 1, sucking the gas generated during the mixing process from the suction end of the pump housing 29, filtering it through the filter element, and discharging it through the air outlet pipe 18. A valve ring 21 and a valve core 19 are provided inside the air outlet pipe 18. Under the action of the spring 22, the valve core 19 seals the valve ring 21 to prevent outside air from flowing back into the pump housing 29 and ensure the suction effect. At the same time, side air holes 20 are also opened on the air outlet pipe 18, and part of the gas intercepted by the valve seat 23 is discharged through the side air holes 20;

[0054] While driving the stirring rod 7 to stir and mix by the motor 2 driving the rotating shaft 5, the power of the rotating shaft 5 is used to link the pump shaft 28, so that the impeller 17 rotates to generate a suction force, timely extracting the gas generated during the mixing process, avoiding the accumulation of gas inside the silicone rubber composite material, thereby preventing voids in the finished product, improving the dielectric properties and product quality. In addition, this device does not require additional power equipment to drive the pump shaft 28, reducing the use cost. In the prior art, the open feed end leads to gas accumulation, affecting the dielectric properties and product quality;

[0055] As Figures 1-5 shown, compared with Embodiment 1, a mixing and stirring device for producing silicone rubber composite materials proposed by the present invention further includes: equally spaced conical gears one 26 are sleeved on the outer wall of the rotating shaft 5, and conical gears two 27 distributed in an annular array are meshed and installed on the outside of the conical gears one 26. One end of the conical gear two 27 is provided with a driven shaft 24, and stirring blades 9 distributed in an annular array are arranged on the outer wall of the driven shaft 24;

[0056] Fixed boxes 6 rotatably installed with the rotating shaft 5 are sleeved on the outside of the conical gears one 26 and the conical gears two 27. Support rods 8 distributed in an annular array and connected to the inner wall of the barrel 1 are arranged on the outer wall of the fixed box 6.

[0057] The fixed box 6 is integrally spherical with a hollow interior. Sealing bearings 25 distributed in an annular array are embedded and installed inside the fixed box 6, and one end of the driven shaft 24 is rotatably installed inside the sealing bearing 25;

[0058] As Figures 6-8, a plurality of ventilation holes 101 are distributed at equal intervals in a ring shape at the bottom of the barrel body 1. A first guiding structure 102 is arranged on one side of the through hole 101, a second guiding structure 103 is arranged on the other side of the through hole 101, a third guiding structure 104 is arranged above the second guiding structure 103. The first guiding structure 102 and the second guiding structure 103 are both arc-shaped structures, and the third guiding structure 104 is an inclined structure. The through hole 101 needs to be externally connected to a gas supply device. The combination of each guiding structure can enable the gas to diffuse along the edge of the barrel body 1, thereby reducing the possibility of the barrel arm sticking to materials. The motor 1 adopts a hollow shaft motor, the inside of the rotating shaft 1 is a hollow structure, a communication hole is provided at the position where the rotating shaft 5 is located at the fixed box 6, and a plurality of micropores 91 are evenly provided among the stirring blades 9 of the driven shaft 24. By externally connecting the rotating shaft to a gas supply device, the gas can be discharged from the micropores 91. Cooperating with the rotation of the stirring blades, the possibility of the blades sticking to materials is greatly reduced, and the stirring and mixing effect is improved. The gas inside generates a suction force through the rotation of the impeller 17, and the gas generated during the mixing process is timely extracted.

[0059] In this embodiment, a first bevel gear 26 is also sleeved on the outer wall of the rotating shaft 5. A second bevel gear 27 is meshed and installed on the outside of the first bevel gear 26. One end of the second bevel gear 27 is provided with a driven shaft 24, and stirring blades 9 are arranged on the outer wall of the driven shaft 24. When the rotating shaft 5 rotates, it drives the first bevel gear 26 to rotate, and then drives the second bevel gear 27 to rotate, so that the driven shaft 24 drives the stirring blades 9 to rotate, and longitudinally stirs the silicone rubber composite material, realizing the direct mixing of the silicone rubber composite material at different heights, improving the stirring efficiency and making the mixing more uniform.

[0060] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A thermally conductive, electrically conductive and shielding silicone rubber composite material, characterized in that, It comprises raw materials in the following parts by weight: Silicone rubber, 180 - 220 parts; Multi-layer composite metal silver, 80 - 120 parts; Thermally conductive and insulating filler, 20 - 80 parts; Fumed silica, 8 - 10 parts; Coupling agent, 8 - 15 parts; Crosslinking agent, 0.5 - 1 part; Vulcanizing agent, 0.5 - 2 parts; Release agent, 0.5 - 1 part.

2. The thermally conductive, electrically conductive and shielding silicone rubber composite material according to claim 1, wherein The multi-layer composite metal silver comprises silver powder, the surface of the silver powder is plated with metallic nickel, and the surface of the metallic nickel is plated with graphene.

3. The thermally conductive, electrically conductive and shielding silicone rubber composite material according to claim 2, wherein The thermally conductive and insulating filler is boron nitride.

4. The thermally conductive, electrically conductive and shielding silicone rubber composite material according to claim 2, characterized in that, The crosslinking agent is low-viscosity linear methylhydrogen silicone oil.

5. The preparation method of a thermally conductive, electrically conductive and shielding silicone rubber composite material according to claim 2, wherein, It comprises the following steps: S1. Weigh the required amounts of raw materials according to the formula; S2. React the conductive filler and part of the coupling agent to form a modified conductive filler; react the thermally conductive and insulating filler and part of the coupling agent to form a modified thermally conductive and insulating filler; S3. React the fumed silica and the remaining coupling agent to form a modified fumed silica; S4. Knead silicone rubber, modified fumed silica, modified conductive filler, modified thermally conductive and insulating filler, and vulcanizing agent to obtain a kneaded rubber; S5. Uniformly mix the kneaded rubber through a mixer; S6. Vulcanize the kneaded rubber, vulcanizing agent, and release agent.

6. The preparation method of a thermally conductive, electrically conductive and shielding silicone rubber composite material according to claim 5, characterized in that, The temperature of the vulcanization is 80 - 150 °C, and the time of the vulcanization is 20 - 50 min.

7. The preparation method of a thermally conductive, electrically conductive and shielding silicone rubber composite material according to claim 5, characterized in that, The mixer comprises a barrel body (1), a motor (2), a rotating shaft (5), and a pump housing (29). A motor (2) is arranged at the upper end of the barrel body (1). A rotating shaft (5) rotatably installed inside the barrel body (1) is arranged at the lower end of the motor (2). A plurality of stirring rods (7) distributed in an annular array are arranged on the outer wall of the rotating shaft (5). A pump housing (29) is arranged at the upper end of the barrel body (1). The suction end of the pump housing (29) penetrates through the upper end inside of the barrel body (1). A pump shaft (28) is rotatably installed inside the pump housing (29). An impeller (17) rotatably installed inside the pump housing (29) is sleeved on the outer wall of the pump shaft (28). A driving wheel (14) is sleeved on the outer wall of the rotating shaft (5). A driven wheel (15) is sleeved on the outer wall of the pump shaft (28). Belts (16) are sleeved on the outer walls of the driving wheel (14) and the driven wheel (15). An air outlet pipe (18) is arranged at the output end of the pump housing (29).

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