Mute oilless air compressor

Abstract

The invention provides a silent oilless air compressor which comprises an air storage tank, a motor and a rack, the rack is fixed to the outer wall of the air storage tank, the motor is fixed to the rack, the two ends of a power shaft of the motor extend out of a shell of the motor and are located in the rack, the power shaft is connected with a connecting rod through a linkage structure, and the connecting rod is connected with the air storage tank. A connecting rod is arranged on the rack, a piston is hinged to the connecting rod, a sealing sleeve is fixedly connected to the rack, the piston is connected into the sealing sleeve in a sliding mode, a one-way air inlet structure corresponding to the sealing sleeve is connected to the rack, the one-way air inlet structure is communicated with an air storage tank through an air inlet pipe, and the piston and the sealing sleeve are both made of Teflon. And the silence and oil-free purposes are achieved.

Description

Technical Field

[0001] The invention relates to an air compressor, in particular to a silent oil-free air compressor. Background Art

[0002] At present, a Chinese patent with authorization announcement number CN222025929U discloses a fixed structure of an air compressor, including a main shell installed on the bottom side of the air compressor, a mounting plate and a mounting seat fixedly installed on the top side of the main shell, a connecting shaft rotatably arranged on one side of the mounting plate, a pressure block fixedly installed on the outer side of the connecting shaft, a plurality of groups of springs fixedly installed on one side of the mounting seat, one end of the plurality of groups of springs are all fixedly connected to a top plate, a top block two is fixedly installed on the bottom side of the top plate, a top block one is also installed on the inner side of the main shell, the top block one and the top block two are arranged against each other, and one end of the pressure block is arranged against the top plate.

[0003] Through the cooperation of top block one and top block two, the pressure block can be flexibly rotated. At the same time, through the cooperation of top block one, threaded column and threaded seat, self-locking of top block one can be achieved, thereby realizing rapid fixing and rapid disassembly of the air compressor.

[0004] However, the fixed structure of this air compressor generally uses two groups of springs and two groups of round holes to realize the inflation process of the air tank. One end of the two groups of springs is fixed to the fixed plate. When the springs swing back and forth, they will hit the fixed plate, causing a large noise problem. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a silent oil-free air compressor to achieve the purpose of being silent and oil-free.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: a silent oil-free air compressor, including an air storage tank, a motor, and a frame. The frame is fixed on the outer wall of the air storage tank, the motor is fixed on the frame, the power shaft of the motor is connected to a connecting rod through a linkage structure, a piston is hinged on the connecting rod, a sealing sleeve is fixedly connected to the frame, the piston is slidably connected to the sealing sleeve, the piston and the sealing sleeve are both made of Teflon, and a one-way air intake structure corresponding to the sealing sleeve is connected to the frame, the one-way air intake structure includes a sealing box, a fixing plate, a partition, an air inlet hole, an air inlet port, an air outlet hole, and an air outlet port. The sealing box is fixed on the frame and corresponds to the sealing sleeve. The partition is fixed on the inner wall of the sealing box and divides the cavity of the sealing box into an air inlet cavity and an air outlet cavity. The air cavity, the air inlet is opened on the sealing box and is connected with the air inlet cavity, the air outlet is opened on the sealing box and is connected with the air outlet cavity, the fixing plate is fixed on the inner wall of the cavity, the fixing plate and the sealing box form a closed space with the cavity, the air inlet and the air outlet are both opened on the fixing plate and are respectively located in the air inlet cavity and the air outlet cavity, the fixing plate is connected with a first spring piece for blocking the air inlet and a second spring piece for blocking the air outlet, the air outlet is connected with the air storage tank through an air inlet pipe, the first spring piece and the second spring piece are respectively located on both sides of the fixing plate, the fixing plate is opened with a guiding slope, the guiding slope is fixedly connected with a sealing ring, the air inlet and the air outlet are both located inside the sealing ring, the first spring piece and the second spring piece are respectively in conflict with the two sealing rings.

[0007] To implement the above technical solution, when the motor starts, the power shaft rotates, and when the piston moves down along the sealing sleeve, negative pressure is generated between the piston and the fixed plate, and air enters the sealing ring from the air inlet hole, the air inlet cavity, and the air inlet port, and the first spring piece is lifted up by the air, and the second spring piece blocks the air outlet by the negative pressure; when the piston moves up along the sealing sleeve, the air lifts up the second spring piece, and the air enters the air inlet pipe from the air outlet, the air outlet cavity, and the air outlet port, and finally enters the air storage tank, and the first spring piece blocks the air inlet port, and the structure is compact. Since the piston and the sealing sleeve are both made of Teflon, they have the effects of being silent and oil-free; and, the sealing ring is fixedly connected on the guiding inclined surface, so that the connection between the first spring piece, the second spring piece and the sealing ring is tighter, which improves the effect of blocking the air inlet and the air outlet while further improving the silent effect.

[0008] As a preferred solution of the present invention, the linkage structure includes an eccentric wheel, a bearing and a jacket, the jacket is fixed to the end of the connecting rod away from the piston, the eccentric wheel is fixed to the power shaft, the outer wall of the bearing is fixedly connected to the inner wall of the jacket, and the outer wall of the eccentric wheel is fixedly connected to the inner wall of the bearing.

[0009] To implement the above technical solution, the power shaft rotates, the eccentric wheel rotates along the axis of the power shaft, the eccentric wheel drives the sleeve to move through the bearing, the sleeve drives the connecting rod to move, and the connection drives the piston to reciprocate along the axial direction of the sealing sleeve. Due to the use of bearings, a silent effect can be achieved.

[0010] As a preferred solution of the present invention, a first protrusion and a second protrusion are fixedly connected to the outer wall of the jacket, an elastic groove is opened on the jacket, the elastic groove connects the outer wall of the jacket and the inner wall of the jacket, the elastic groove is located between the first protrusion and the second protrusion, and the first protrusion and the second protrusion are locked by a fixing bolt so that the jacket clamps the bearing.

[0011] To implement the above technical solution, the locking bolt is rotated to move the first protrusion and the second protrusion toward each other, so that the sleeve clamps the bearing and the connection between the bearing and the sleeve is more stable.

[0012] As a preferred solution of the present invention, a counterweight is fixedly connected to the eccentric wheel of the jacket, and the counterweight is located on a side of the eccentric wheel facing away from the motor.

[0013] The above technical solution is implemented to make the power shaft have better dynamic balance, achieve the effect of shock absorption and realize the purpose of silence.

[0014] As a preferred solution of the present invention, ventilation holes are provided on the side walls of the frame, a rotating shaft is rotatably connected to the side walls of the frame, the rotating shaft and the power shaft have opposite directions of rotation, fan blades are connected to the rotating shaft, the power shaft drives the rotating shaft to rotate through a conduction component, the axis of the rotating shaft is colinear with the axis of the power shaft, and heat dissipation holes are provided on the motor.

[0015] To implement the above technical solution, when the power shaft rotates, the rotating shaft is rotated through the conduction component, and the rotating shaft drives the fan blades to rotate. The generated wind enters the frame from a ventilation hole, passes through the heat dissipation holes, and is output from another ventilation hole, thereby achieving a better heat dissipation effect on the motor; and because the rotation directions of the rotating shaft and the power shaft are opposite, the gyroscopic effect can be greatly reduced, thereby greatly reducing vibration and greatly improving the quiet effect. At the same time, when the motor is started, the air compressor can be easily moved.

[0016] As a preferred embodiment of the present invention, the transmission assembly includes a transmission shaft, a belt, a first connecting wheel, a second connecting wheel, a first gear and a second gear. The transmission shaft is rotatably connected to the inner wall of the frame. The first connecting wheel is fixed on the power shaft and coaxially arranged with the power shaft. The second connecting wheel is fixed on the transmission shaft and coaxially arranged with the transmission shaft. The belt is tensioned by the first connecting wheel and the second connecting wheel. The first gear is fixed on one end of the transmission shaft away from the second connecting wheel and coaxially arranged with the transmission shaft. The second gear is fixed on the rotating shaft and coaxially arranged with the rotating shaft. The first gear is meshed with the second gear.

[0017] To implement the above technical solution, when the power shaft rotates, the power shaft drives the first connecting wheel to rotate, the first connecting wheel drives the second connecting wheel to rotate through a belt, the second connecting wheel drives the transmission shaft to rotate, the transmission shaft drives the first gear to rotate, the first gear drives the second gear to rotate, and the second gear drives the rotating shaft to rotate; the power shaft, the first connecting wheel, the second connecting wheel, the transmission shaft, and the first gear have the same direction of rotation, the second gear and the rotating shaft have the same direction of rotation, and the first gear and the second gear have opposite directions of rotation.

[0018] As a preferred solution of the present invention, a support seat is fixedly connected to the inner wall of the frame, a support rod is slidably connected to the support seat, the axis of the support rod is colinear with the axis of the rotating shaft, a support frame is connected to the support rod, and the support frame is hinged with a scraper for scraping the inner wall of the frame through a pin shaft, and the rotating shaft rotates and drives the support rod to reciprocate through a power mechanism.

[0019] To implement the above technical solution, during the rotation of the rotating shaft, the support rod is reciprocated by the power mechanism, so that the scraper moves back and forth, and the dust is scraped toward the end of the frame to facilitate cleaning.

[0020] As a preferred solution of the present invention, the power mechanism includes a first elastic member, a second elastic member, a fixed wheel, a first convex plate, and a second convex plate. The fixed wheel is fixed on the rotating shaft and is coaxially arranged with the rotating shaft. The first convex plate is fixed on the surface of the fixed wheel, and the second convex plate is fixed on the outer cylindrical surface of the fixed wheel. A sliding rod is fixedly connected to the support frame, and the sliding rod is slidably connected to the first convex plate or the surface of the fixed wheel. The side of the scraper facing the fixed wheel is used to contact with the outer cylindrical surface of the fixed wheel or with the second convex plate. The two ends of the second elastic member are respectively connected to the support frame and the scraper, and the two ends of the first elastic member are respectively connected to the support frame and the support seat.

[0021] To implement the above technical solution, the rotating shaft rotates, the fixed wheel rotates, the second convex plate and the scraper come into conflict, causing the scraper to flip along the axis of the pin shaft, causing the scraper to come into conflict with the inner wall of the frame, and the fixed wheel continues to rotate. When the first convex plate comes into conflict with the sliding rod, the sliding rod drives the support frame to move, and the support frame drives the support rod to move along the axial direction of the support rod, so that the scraper moves along the inner wall of the frame to scrape off part of the dust attached to the inner wall of the frame; as the fixed wheel rotates, the fixed wheel comes into conflict with the scraper and the sliding rod, the support frame is reset by the elastic force of the first elastic member, and the scraper is reset by the elastic force of the second elastic member; thereby achieving the purpose of facilitating cleaning.

[0022] As a preferred solution of the present invention, the scraper is connected with bristles via Velcro.

[0023] The above technical solution is implemented to facilitate the replacement of bristles.

[0024] In summary, the present invention has the following beneficial effects: 1. The motor starts, the power shaft rotates, the two pistons operate at the same time, and the two air intake pipes can inject air into the air tank at the same time, greatly improving production efficiency; 2. The power shaft rotates, and the rotating shaft also rotates. The power shaft and the rotating shaft rotate in opposite directions, which greatly reduces the gyroscopic effect and thus greatly improves the shock absorption effect; 3. Due to the air-cooling structure, there will be more dust in some parts of the inner wall of the rack. During the rotation of the rotating shaft, the scraper moves along the inner wall of the rack, and then the scraper separates from the rack and resets to scrape off most of the dust on the inner wall of the rack, so as to facilitate dust cleaning and improve the heat dissipation of the rack. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the external structure of the present invention; Figure 2 To show the structural diagram of the motor; Figure 3 A schematic diagram showing the structure of the counterweight block; Figure 4 To illustrate the structural diagram of the sealing box; Figure 5 To show the structural diagram of the fixed plate; Figure 6 A schematic diagram showing the location of the air outlet; Figure 7 is a schematic diagram of the structure of the second spring piece; Figure 8 is a schematic diagram of the structure of the first spring piece; Fig. 9 Schematic diagram of the location of the heat dissipation holes; Fig.10It is a schematic diagram of the structure of the fan blade; Fig.11 Schematic diagram of the structure of the first gear.

[0026] Figure numerals: 1, gas tank; 11, motor; 12, power shaft; 2, frame; 31, connecting rod; 32, piston; 33, sealing sleeve; 4, linkage structure; 41, eccentric wheel; 42, bearing; 43, jacket; 44, first protrusion; 45, second protrusion; 46, elastic groove; 47, counterweight; 5, one-way air intake structure; 51, sealing box; 52, fixing plate; 53, partition; 531, air intake chamber; 532, air outlet chamber; 54, air inlet hole; 55, air inlet port; 56, air outlet hole; 57, air outlet port; 58, first spring piece; 59, second spring piece ; 591. guide slope; 592. sealing ring; 61. ventilation hole; 62. heat dissipation hole; 63. rotating shaft; 64. fan blade; 7. conduction component; 71. conduction shaft; 72. belt; 73. first connecting wheel; 74. second connecting wheel; 75. first gear; 76. second gear; 81. support seat; 82. support rod; 83. support frame; 84. scraper; 9. power mechanism; 91. first elastic member; 92. second elastic member; 93. fixed wheel; 94. first convex plate; 95. second convex plate; 96. slide rod; 97. support wheel; 98. bristles. DETAILED DESCRIPTION

[0027] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0028] A silent oil-free air compressor comprises a gas storage tank 1, a motor 11, and a frame 2. The frame 2 is fixed to the outer wall of the gas storage tank 1, and the frame 2 is located above the gas storage tank 1. The motor 11 is fixed to the middle of the frame 2. Both ends of a power shaft 12 of the motor 11 extend from the housing of the motor 11 and are located in the frame 2. The motor 11 is a double-headed motor 11.

[0029] The power shaft 12 is connected to a connecting rod 31 through a linkage structure 4. A piston 32 is hinged on the upper end of the connecting rod 31. A sealing sleeve 33 is fixedly connected to the inner wall of the frame 2. The piston 32 and the sealing sleeve 33 are both made of Teflon to achieve the purpose of being oil-free. The piston 32 is slidably connected to the sealing sleeve 33.

[0030] The linkage structure 4 includes an eccentric wheel 41, a bearing 42 and a jacket 43. The jacket 43 is fixed to the end of the connecting rod 31 away from the piston 32. The eccentric wheel 41 is fixed to the power shaft 12, and the outer wall of the bearing 42 is fixedly connected to the inner wall of the jacket 43. The outer wall of the eccentric wheel 41 is fixedly connected to the inner wall of the bearing 42. A counterweight 47 is fixedly connected to the eccentric wheel 41, and the counterweight 47 is located on the side of the eccentric wheel 41 facing away from the motor 11.

[0031] The outer wall is fixedly connected with a first protrusion 44 and a second protrusion 45. The jacket 43 is provided with an elastic groove 46, which communicates with the outer wall of the jacket 43 and the inner wall of the jacket 43, and is located between the first protrusion 44 and the second protrusion 45. The first protrusion 44 and the second protrusion 45 are locked by a fixing bolt so that the jacket 43 clamps the bearing 42.

[0032] A one-way air intake structure 5 corresponding to the sealing sleeve 33 is connected to the frame 2 , and the one-way air intake structure 5 is connected to the air storage tank 1 through an air intake pipe.

[0033] The one-way air intake structure 5 includes a sealing box 51, a fixing plate 52, a partition 53, an air intake hole 54, an air intake port 55, an air outlet hole 56, and an air outlet port 57. The sealing box 51 is fixed to the upper end of the frame 2 and corresponds to the sealing sleeve 33. The partition 53 is fixed to the inner wall of the sealing box 51 and divides the cavity of the sealing box 51 into an air intake cavity 531 and an air outlet cavity 532. The cross section of the cavity is circular. The partition 53 is arranged along the radial direction of the cavity.

[0034] The air inlet 54 is formed on the sealing box 51 and communicates with the air inlet cavity 531. The air outlet 56 is formed on the sealing box 51 and communicates with the air outlet cavity 532. The air outlet 56 communicates with the air inlet pipe.

[0035] The fixing plate 52 is fixed to the inner wall of the cavity, and the fixing plate 52 and the sealing box 51 form a closed space in the cavity. The air inlet 55 and the air outlet 57 are both opened on the fixing plate 52 and are respectively located in the air inlet cavity 531 and the air outlet cavity 532. The air inlet 55 and the air outlet 57 are both connected to the sealing sleeve 33. The fixing plate 52 is connected with a first elastic piece 58 for blocking the air inlet 55 and a second elastic piece 59 for blocking the air outlet 57, and the first elastic piece 58 and the second elastic piece 59 are respectively located on both sides of the fixing plate 52.

[0036] One end of each of the first elastic sheet 58 and the second elastic sheet 59 is fixedly connected to the fixing plate 52 , so that the first elastic sheet 58 and the second elastic sheet 59 can be in a lifted state.

[0037] The fixing plate 52 is provided with a guide slope 591, to which a sealing ring 592 made of rubber is fixedly connected, and the air inlet 55 and the air outlet 57 are both located inside the sealing ring 592. The first elastic sheet 58 and the second elastic sheet 59 are respectively in contact with the two sealing rings 592, so as to seal the air inlet 55 and the air outlet 57 more tightly and more quietly.

[0038] A ventilation hole 61 is provided on the side wall of the frame 2, and a rotating shaft 63 is rotatably connected to the side wall of the frame 2. The rotating shaft 63 and the power shaft 12 have opposite directions of rotation, and the axis of the rotating shaft 63 is colinear with the axis of the power shaft 12. A fan blade 64 is connected to the rotating shaft 63, and a heat dissipation hole 62 is provided on the motor 11. The power shaft 12 drives the rotating shaft 63 to rotate through the conduction component 7. Since the power shaft 12 and the rotating shaft 63 have opposite directions of rotation, the gyro effect can be greatly reduced or even eliminated, thereby greatly improving the shock absorption effect and the heat dissipation.

[0039] The fan blades 64 on the two rotating shafts 63 face the same direction. When the rotating shaft 63 rotates, the wind generated by one fan blade 64 blows toward the heat dissipation hole 62, and the wind generated by the other fan blade 64 sucks the wind from the heat dissipation hole 62, thereby greatly increasing the wind speed. The fan blades 64 and the rotating shaft 63 are both located on the side of the counterweight 47 facing away from the motor 11.

[0040] The transmission assembly 7 includes a transmission shaft 71, a belt 72, a first connecting wheel 73, a second connecting wheel 74, a first gear 75 and a second gear 76. The transmission shaft 71 is rotatably connected to the inner wall of the frame 2. The first connecting wheel 73 is fixed to the power shaft 12 and is coaxially arranged with the power shaft 12; the second connecting wheel 74 is fixed to the transmission shaft 71 and is coaxially arranged with the transmission shaft 71. The belt 72 is tensioned by the first connecting wheel 73 and the second connecting wheel 74.

[0041] The first gear 75 is fixed to one end of the transmission shaft 71 away from the second connecting wheel 74 and is coaxially disposed with the transmission shaft 71. The second gear 76 is fixed to the rotating shaft 63 and is coaxially disposed with the rotating shaft 63. The first gear 75 meshes with the second gear 76.

[0042] The axis of the transmission shaft 71 is parallel to the axis of the power shaft 12 .

[0043] A support seat 81 is fixedly connected to the inner wall of the frame 2, and a support rod 82 is slidably connected to the support seat 81. The cross section of the support rod 82 is semicircular, and the axis of the support rod 82 is colinear with the axis of the rotating shaft 63. A support frame 83 is fixedly connected to the support rod 82, and a scraper 84 for scraping the inner wall of the frame 2 is hingedly connected to the support frame 83 through a pin shaft. The rotating shaft 63 rotates and drives the support rod 82 to reciprocate through the power mechanism 9. The scraper 84 is arc-shaped.

[0044] The power mechanism 9 includes a first elastic member 91, a second elastic member 92, a fixed wheel 93, a first convex plate 94, and a second convex plate 95. The fixed wheel 93 is fixed on the rotating shaft 63 and is coaxially arranged with the rotating shaft 63, the first convex plate 94 is fixed on the surface of the fixed wheel 93, and the second convex plate 95 is fixed on the outer circumferential surface of the fixed wheel 93.

[0045] A slide bar 96 is fixedly connected to the support frame 83, and the axis of the slide bar 96 is parallel to the axis of the support bar 82. The end of the slide bar 96 is hemispherical and slidably connected to the surface of the first convex plate 94 or the fixed wheel 93. The scraper 84 is integrally connected to the side facing the fixed wheel 93 with a support rod, and the support wheel 97 rotatably connected to the support rod is used to contact the outer cylindrical surface of the fixed wheel 93 or the second convex plate 95. The two ends of the second elastic member 92 are respectively connected to the support frame 83 and the scraper 84, and the two ends of the first elastic member 91 are respectively connected to the support frame 83 and the support seat 81.

[0046] The first elastic member 91 and the second elastic member 92 are both springs. The first elastic member 91 applies a force to the support frame 83 in a direction away from the support seat 81 , and the second elastic member 92 applies a force to the scraper 84 in a direction close to the fixed wheel 93 .

[0047] On one side of the motor 11, two support seats 81 may be provided, that is, two scrapers 84 are provided, and the two scrapers 84 are arranged opposite to each other, so that the two scrapers 84 can contact the inner wall of the frame 2, so that part of the dust attached to the inner wall of the frame 2 is scraped toward the ventilation hole 61, and the dust can be wiped off with a rag after the side wall of the frame 2 is removed, so as to achieve the purpose of easy cleaning. At the same time, since the dust moves to the end of the frame 2, the heat dissipation performance of the frame 2 can be improved, so that the heat dissipation performance of the motor 11 fixed on the frame 2 is better.

[0048] The scraper 84 is connected with bristles 98 on one side of the inner wall of the frame 2 through Velcro. The bristles 98 are made of polyethylene fibers.

[0049] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A silent oil-free air compressor, comprising a gas storage tank (1), a motor (11), and a frame (2), wherein the frame (2) is fixed to the outer wall of the gas storage tank (1), and the motor (11) is fixed to the frame (2), wherein: The power shaft (12) of the motor (11) is connected to a connecting rod (31) through a linkage structure (4), a piston (32) is hinged on the connecting rod (31), a sealing sleeve (33) is fixedly connected to the frame (2), the piston (32) is slidably connected to the sealing sleeve (33), the piston (32) and the sealing sleeve (33) are both made of Teflon, and a one-way air intake structure (5) corresponding to the sealing sleeve (33) is connected to the frame (2), and the one-way air intake structure (5) includes a sealing box (51), The sealing box (51) is fixed on the frame (2) and corresponds to the sealing sleeve (33); the partition (53) is fixed on the inner wall of the sealing box (51) and divides the cavity of the sealing box (51) into an air inlet cavity (531) and an air outlet cavity (532); the air inlet hole (54) is opened on the sealing box (51) and communicates with the air inlet cavity (531); the air outlet hole (56) is opened The fixing plate (52) is arranged on the sealing box (51) and is connected to the air outlet cavity (532). The fixing plate (52) is fixed on the inner wall of the cavity. The fixing plate (52) and the sealing box (51) form a closed space in the cavity. The air inlet (55) and the air outlet (57) are both opened on the fixing plate (52) and are respectively located in the air inlet cavity (531) and the air outlet cavity (532). The fixing plate (52) is connected with a first spring piece (58) for blocking the air inlet (55) and a second spring piece (57) for blocking the air outlet (57). 9), the air outlet (56) is connected to the air storage tank (1) through the air inlet pipe, the first spring sheet (58) and the second spring sheet (59) are respectively located on both sides of the fixing plate (52), the fixing plate (52) is provided with a guiding inclined surface (591), the guiding inclined surface (591) is fixedly connected to the sealing ring (592), the air inlet (55) and the air outlet (57) are both located inside the sealing ring (592), and the first spring sheet (58) and the second spring sheet (59) are respectively in contact with the two sealing rings (592).

2. The silent oil-free air compressor according to claim 1 is characterized in that: The linkage structure (4) comprises an eccentric wheel (41), a bearing (42) and a sleeve (43); the sleeve (43) is fixed to an end of the connecting rod (31) away from the piston (32); the eccentric wheel (41) is fixed to the power shaft (12); the outer wall of the bearing (42) is fixedly connected to the inner wall of the sleeve (43); and the outer wall of the eccentric wheel (41) is fixedly connected to the inner wall of the bearing (42).

3. The silent oil-free air compressor according to claim 2 is characterized in that: A first protrusion (44) and a second protrusion (45) are fixedly connected to the outer wall of the jacket (43); an elastic groove (46) is provided on the jacket (43); the elastic groove (46) communicates with the outer wall of the jacket (43) and the inner wall of the jacket (43); the elastic groove (46) is located between the first protrusion (44) and the second protrusion (45); the first protrusion (44) and the second protrusion (45) are locked by a fixing bolt so that the jacket (43) clamps the bearing (42).

4. The silent oil-free air compressor according to claim 2 is characterized in that: A counterweight (47) is fixedly connected to the eccentric wheel (41) of the jacket (43), and the counterweight (47) is located on a side of the eccentric wheel (41) facing away from the motor (11).

5. The silent oil-free air compressor according to claim 1 is characterized in that: A ventilation hole (61) is provided on the side wall of the frame (2); a rotating shaft (63) is rotatably connected to the side wall of the frame (2); the rotating shaft (63) and the power shaft (12) have opposite directions of rotation; a fan blade (64) is connected to the rotating shaft (63); the power shaft (12) drives the rotating shaft (63) to rotate through a conduction component (7); the axis of the rotating shaft (63) is colinear with the axis of the power shaft (12); and a heat dissipation hole (62) is provided on the motor (11).

6. The silent oil-free air compressor according to claim 5 is characterized in that: The transmission assembly (7) comprises a transmission shaft (71), a belt (72), a first connecting wheel (73), a second connecting wheel (74), a first gear (75) and a second gear (76); the transmission shaft (71) is rotatably connected to the inner wall of the frame (2); the first connecting wheel (73) is fixed to the power shaft (12) and is coaxially arranged with the power shaft (12); the second connecting wheel (74) is fixed to the transmission shaft (71) and is coaxially arranged with the transmission shaft (71); the belt (72) is tensioned by the first connecting wheel (73) and the second connecting wheel (74); the first gear (75) is fixed to one end of the transmission shaft (71) away from the second connecting wheel (74) and is coaxially arranged with the transmission shaft (71); the second gear (76) is fixed to the rotating shaft (63) and is coaxially arranged with the rotating shaft (63); and the first gear (75) is meshed with the second gear (76).

7. The silent oil-free air compressor according to claim 6 is characterized in that: A support seat (81) is fixedly connected to the inner wall of the frame (2), a support rod (82) is slidably connected to the support seat (81), the axis of the support rod (82) is colinear with the axis of the rotating shaft (63), a support frame (83) is connected to the support rod (82), a scraper (84) for scraping the inner wall of the frame (2) is hingedly connected to the support frame (83) through a pin shaft, and the rotating shaft (63) rotates and drives the support rod (82) to move back and forth through a power mechanism (9).

8. The silent oil-free air compressor according to claim 7 is characterized in that: The power mechanism (9) comprises a first elastic member (91), a second elastic member (92), a fixed wheel (93), a first convex plate (94), and a second convex plate (95); the fixed wheel (93) is fixed on the rotating shaft (63) and is coaxially arranged with the rotating shaft (63); the first convex plate (94) is fixed on the surface of the fixed wheel (93); the second convex plate (95) is fixed on the outer circumferential surface of the fixed wheel (93); and the support frame (83) is fixedly connected with a A slide bar (96), wherein the slide bar (96) is slidably connected to the surface of the first convex plate (94) or the fixed wheel (93), the scraper (84) faces the fixed wheel (93) on one side thereof and is used to contact with the outer cylindrical surface of the fixed wheel (93) or with the second convex plate (95), the two ends of the second elastic member (92) are respectively connected to the support frame (83) and the scraper (84), and the two ends of the first elastic member (91) are respectively connected to the support frame (83) and the support seat (81).

9. The silent oil-free air compressor according to claim 8 is characterized in that: The scraper (84) is connected with bristles (98) via Velcro.

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