Inflator pump

Abstract

The utility model discloses an inflator pump which comprises a shell, the shell comprises a middle shell, an upper shell is arranged at the top of the middle shell, a lower shell is arranged at the bottom of the middle shell, a driving mechanism is installed in the shell, the driving mechanism is installed in a barrel shell, and an inclined swinging piece, a piston and a circular plate are arranged in the barrel shell. A plurality of piston holes are annularly and longitudinally formed in the top of the circular plate at equal angles in a penetrating mode, pistons are arranged in the piston holes in a matched mode, the driving mechanism is used for driving the oblique swinging piece to swing and periodically push and pull the pistons to reciprocate, a through hole is formed in the center of the top of the circular plate in a penetrating mode, and a one-way valve is installed in the through hole. An air exhaust nozzle threaded opening is formed in the top of the upper shell in a penetrating mode, and an air inflation nozzle threaded opening is formed in the bottom of the lower shell in a penetrating mode. The problems that most of existing air inflation pumps only have a single air inflation function and are difficult to have the air exhaust function and the air inflation function at the same time, a user needs to additionally purchase air exhaust equipment, and the use cost is increased are solved.

Description

Technical Field

[0001] This utility model relates to the field of air pump technology, and in particular to an air pump. Background Technology

[0002] An air pump is a common mechanical device mainly used to compress air or other gases and deliver them to a specific container or space to increase the internal air pressure. Air pumps have a wide range of applications, covering many fields such as daily life, industrial production, and healthcare. In daily life, air pumps are often used to inflate car tires, bicycle tires, air mattresses, swimming rings, etc.

[0003] Most existing air pumps only have a single inflation function and cannot simultaneously perform both inflation and deflation functions. Users need to purchase additional deflation equipment, which increases the cost of use. Therefore, this utility model proposes an air pump to solve the above problems. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an air pump.

[0005] To achieve the above objectives, this utility model provides an air pump, including a housing, the housing comprising an intermediate housing, an upper housing at the top of the intermediate housing, and a lower housing at the bottom of the intermediate housing. A drive mechanism is installed inside the housing, the drive mechanism being installed inside a cylindrical shell. An inclined swing member, a piston, and a circular plate are provided inside the cylindrical shell. A plurality of piston holes are longitudinally and annularly through the top of the circular plate at equal angles, and the pistons are fitted into the piston holes. The drive mechanism is used to drive the inclined swing member to swing and periodically push and pull the pistons in reciprocating motion. A through hole is provided at the center of the top of the circular plate, and a one-way valve is installed in the through hole. An air suction nozzle threaded opening is provided at the top of the upper housing, and an air inflation nozzle threaded opening is provided at the bottom of the lower housing.

[0006] Furthermore, both the upper and lower shells are integrally formed with the intermediate shell, and both the suction nozzle thread and the inflation nozzle thread can be connected to an air nozzle.

[0007] Furthermore, the air nozzle includes a threaded tube end, and the threaded openings of the suction nozzle and the inflation nozzle are both threadedly engaged with the threaded tube end. An air nozzle end is installed on the top of the threaded tube end, and the air nozzle end communicates with the threaded tube end.

[0008] Furthermore, a control panel is provided on the front of the intermediate shell, the control panel includes a power switch, a pressure adjustment button and a display screen, and a controller is installed inside the intermediate shell, and the drive mechanism and the control panel are both electrically connected to the controller.

[0009] Furthermore, the side wall of the intermediate shell is provided with an interface structure, the interface structure including an interface groove, in which a car charger DC head and a Type-C charging port are provided, and a dust plug is removably attached to the interface groove.

[0010] Furthermore, the outer wall of the housing is provided with a heat dissipation mechanism, which includes a first heat dissipation outlet and a second heat dissipation outlet. The first heat dissipation outlet is located on the side wall of the upper housing, and the second heat dissipation outlet is located on the side wall of the middle housing.

[0011] Furthermore, the driving mechanism includes a motor, which is installed on one side of the bottom of the cylindrical shell. The cylindrical shell is fixedly disposed inside the intermediate shell. The output end of the motor passes through the cylindrical shell and is equipped with an output gear. An eccentric wheel is rotatably disposed inside the cylindrical shell and meshes with the output gear. An eccentric rod is installed above the eccentric wheel, and an inclined swing member is installed above the eccentric rod. An eccentric hole is opened at the top of the eccentric rod. The central axis of the eccentric hole forms a certain angle with the rotation axis of the eccentric wheel. One end of a transmission shaft is inserted into the eccentric hole, and the other end of the transmission shaft is equipped with an inclined swing member. The transmission shaft is connected to the center position of the inclined swing member.

[0012] Furthermore, several swing arms are evenly fixedly arranged on the periphery of the inclined swing component, and a connecting hole is opened through the top of the swing arm. The circular plate is fixedly arranged inside the upper end of the cylindrical shell. A piston rod is fixedly arranged at the bottom of the piston, and a connecting ball head is fixedly arranged at the bottom of the piston rod. The connection ball head and the connecting hole cooperate to realize the connection between the piston and the inclined swing component.

[0013] Furthermore, an anti-scratch washer is fixedly provided at the bottom of the circular plate, the inner wall of the anti-scratch washer is smoothly provided, the swing arm slides in contact with the anti-scratch washer, and a rotating rod is fixedly provided at the bottom of the eccentric wheel, the rotating rod is rotatably installed at the bottom of the cylindrical shell.

[0014] Furthermore, a connecting block is fixedly installed on the top of the eccentric wheel, and the eccentric rod is fixedly installed on the top of the connecting block. An air suction pipe is installed on the other side of the bottom of the cylindrical shell. The air suction pipe passes through the cylindrical shell, and the point where the air suction pipe passes through the cylindrical shell is sealed.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention utilizes a structure incorporating a one-way valve, piston, and air nozzle. After the motor starts, its output end drives the output gear to rotate. The output gear meshes with an eccentric wheel, causing the eccentric wheel to rotate. The rotation of the eccentric wheel is transmitted to the inclined swinging component via the eccentric rod and transmission shaft, causing the inclined swinging component to oscillate. The oscillation of the inclined swinging component drives the piston to reciprocate within the piston hole via the connecting block and connecting ball head. When inflation is required, a suitable air nozzle is selected and tightened with the threaded port of the inflation pump's air nozzle. The air nozzle is then inserted into the valve of the product requiring inflation and tightened. When the piston moves downwards, the gas inside the cylindrical shell enters the upper shell through the one-way valve; when the piston moves upwards... When in operation, the gas inside the upper shell is compressed and enters the inflatable product through the air nozzle. This process repeats to achieve the inflation function. When air needs to be evacuated, select the appropriate air nozzle and tighten it with the threaded port of the air pump's suction nozzle. Then, insert the air nozzle into the valve of the product that needs to be evacuated and tighten it. When the piston moves upward, the gas inside the product is extracted. When the piston moves downward, the gas inside the cylindrical shell is discharged out through the one-way valve. This process repeats to achieve the suction function. This solves the problem that most existing air pumps only have a single inflation function and cannot simultaneously perform both inflation and suction functions. Users need to purchase additional suction equipment, which increases the cost of use.

[0017] This utility model facilitates the power supply for charging an air pump by setting a car charger DC head and a Type-C charging port. The dust plug, which can be detachably locked in the interface slot, can protect the car charger DC head and Type-C charging port from dust.

[0018] This invention improves the heat dissipation performance of the air pump and increases its service life by setting a first heat dissipation outlet and a second heat dissipation outlet.

[0019] This invention provides an anti-scratching washer between the inclined swing component and the inner wall of the cylindrical shell. During the swinging process, the inclined swing component slides in contact with the smooth inner wall of the anti-scratching washer, effectively avoiding direct scraping between the inclined swing component and the inner wall of the cylindrical shell, reducing noise caused by scraping, and also reducing wear on the inner wall of the cylindrical shell during the swinging process, thus extending the service life of the inclined swing component. Attached Figure Description

[0020] To more clearly illustrate the solutions in this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is the front perspective view provided by this utility model;

[0022] Figure 2This is a rear-view perspective view provided by this utility model;

[0023] Figure 3 This is the front view provided by this utility model;

[0024] Figure 4 This is a schematic diagram of the structure provided by this utility model;

[0025] Figure 5 This is a schematic diagram of the air nozzle structure provided by this utility model;

[0026] Figure 6 This is a perspective view of the drive mechanism and cylindrical shell provided by this utility model;

[0027] Figure 7 This is an exploded view of the drive mechanism provided by this utility model;

[0028] Figure 8 This is the front view of the piston provided by this utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Piston hole; 2. Drive mechanism; 21. Motor; 22. Eccentric wheel; 23. Drive shaft; 24. Rocker arm; 25. Eccentric hole; 26. Output gear; 27. Connecting hole; 28. Inclined rocker; 29. ​​Rotating rod; 3. Housing; 31. Upper housing; 32. Middle housing; 33. Lower housing; 4. Anti-scratch washer; 5. Round plate; 6. Connecting block; 7. Eccentric rod; 8. Air nozzle; 81. Air nozzle end; 82. Threaded pipe end; 9. Connecting ball head; 10. Live 11. Plug; 12. Cylindrical shell; 13. Suction pipe; 14. Threaded inlet of air nozzle; 15. Threaded inlet of air suction nozzle; 16. Through hole; 17. One-way valve; 18. Control panel; 19. Display screen; 10. Power switch; 11. Pressure adjustment button; 12. Interface structure; 13. Dust plug; 14. Car charger DC head; 15. Type-C charging port; 16. Heat dissipation mechanism; 17. First heat dissipation vent; 18. Second heat dissipation vent. Detailed Implementation

[0031] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings, so that the advantages and features of this utility model can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and accompanying drawings of this utility model are intended to cover non-exclusive inclusion. The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a specific order.

[0033] Please see Figure 1-8An air pump includes a housing 3, which includes an intermediate housing 32. An upper housing 31 is located at the top of the intermediate housing 32, and a lower housing 33 is located at the bottom of the intermediate housing 32. A drive mechanism 2 is installed inside the housing 3, within a cylindrical shell 11. The cylindrical shell 11 contains a sway bar 28, a piston 10, and a circular plate 5. The top of the circular plate 5 has several piston holes 1 extending longitudinally at equal angles. Pistons 10 are fitted into the piston holes 1. The drive mechanism 2 drives the sway bar 28 to swing and periodically push and pull the pistons 10 in reciprocating motion. The drive mechanism 2 includes a motor 21, which is installed on one side of the bottom of the cylindrical shell 11. An air intake pipe 12 is installed on the other side of the bottom of the cylindrical shell 11, penetrating the cylindrical shell 11. The passage between the 12 and the cylindrical shell 11 is sealed. The cylindrical shell 11 is fixedly installed inside the intermediate shell 32. The output end of the motor 21 passes through the cylindrical shell 11 and is equipped with an output gear 26. An eccentric wheel 22 is rotatably installed inside the cylindrical shell 11. A rotating rod 29 is fixedly installed at the bottom of the eccentric wheel 22. The rotating rod 29 is rotatably installed at the bottom inside the cylindrical shell 11. The eccentric wheel 22 meshes with the output gear 26. An eccentric rod 7 is installed above the eccentric wheel 22. A connecting block 6 is fixedly installed at the top of the eccentric wheel 22. An eccentric rod 7 is fixedly installed at the top of the connecting block 6. An inclined swing member 28 is installed above the eccentric rod 7. An eccentric hole 25 is opened at the top of the eccentric rod 7. The central axis of the eccentric hole 25 forms a certain angle with the rotation axis of the eccentric wheel 22. One end of the drive shaft 23 is inserted and installed, and the other end of the drive shaft 23 is installed with an inclined swing member 28. The drive shaft 23 is connected to the center of the inclined swing member 28. Several swing arms 24 are evenly fixed around the periphery of the inclined swing member 28. The top of the swing arms 24 is provided with a connecting hole 27. The circular plate 5 is fixedly installed inside the upper end of the cylindrical shell 11. The bottom of the piston 10 is fixedly provided with a piston rod. The bottom of the piston rod is fixedly provided with a connecting ball head 9. The connection ball head 9 and the connecting hole 27 are used to connect the piston 10 and the inclined swing member 28. The center of the top of the circular plate 5 is provided with a through hole 15. A one-way valve 16 is installed in the through hole 15. The one-way valve 16 allows the gas in the intermediate shell 32 to be discharged outward. The top of the upper shell 31 is provided with a threaded port 14 for suction. The bottom of shell 33 has a through-hole inlet 13 for an inflation nozzle. Both the upper shell 31 and lower shell 33 are integrally formed with the intermediate shell 32. Both the suction nozzle thread 14 and the inflation nozzle thread 13 can be connected to an air nozzle 8. The air nozzle 8 includes a threaded tube end 82. Both the suction nozzle thread 14 and the inflation nozzle thread 13 are threaded into the threaded tube end 82. An air nozzle end 81 is installed on the top of the threaded tube end 82, communicating with it. The front of the intermediate shell 32 has a control panel 17, which includes an on / off switch 172, a pressure adjustment button 173, and a display screen 171. A controller is installed inside the intermediate shell 32. The drive mechanism 2 and the control panel 17 are electrically connected to the controller. After the motor 21 starts, its output end drives the output gear 26 to rotate.Output gear 26 meshes with eccentric wheel 22, causing eccentric wheel 22 to rotate. The rotation of eccentric wheel 22 is transmitted to inclined rocker 28 through eccentric rod 7 and transmission shaft 23, causing inclined rocker 28 to oscillate. The oscillation of inclined rocker 28 drives piston 10 to reciprocate within piston hole 1 through rocker arm 24 and connecting ball head 9. When inflation is required, select a suitable air nozzle 8 and tighten it with the threaded port 13 of the air pump's air nozzle. Then, insert air nozzle 8 into the valve of the product requiring inflation and tighten it. When piston 10 moves downward, gas in cylindrical shell 11 enters upper shell 31 through one-way valve 16; when piston 10 moves upward, gas in upper shell 31... The compressed air enters the inflatable product through the air nozzle 8, and this cycle repeats to achieve the inflation function. When deflating is needed, select the appropriate air nozzle 8 and tighten it with the threaded port 14 of the air pump's suction nozzle. Then, insert the air nozzle 8 into the valve of the product that needs deflating and tighten it. When the piston 10 moves upward, it extracts the gas from the product; when the piston 10 moves downward, it discharges the gas inside the cylindrical shell 11 through the one-way valve 16. This cycle repeats to achieve the deflating function. This solves the problem that most existing air pumps only have a single inflation function and cannot simultaneously perform both deflating and inflation functions, requiring users to purchase additional deflating equipment, thus increasing operating costs.

[0034] As an improvement to the above technical solution, the side wall of the intermediate shell 32 is provided with an interface structure 18. The interface structure 18 includes an interface groove, in which a car charger DC head 182 and a Type-C charging port 183 are provided. A dust plug 181 is detachably attached to the interface groove. The car charger DC head 182 and the Type-C charging port 183 facilitate the provision of power for charging the air pump. The dust plug 181, which is detachably attached to the interface groove, can provide dust protection for the car charger DC head 182 and the Type-C charging port 183.

[0035] As an improvement to the above technical solution, a heat dissipation mechanism 19 is provided on the outer wall of the housing 3. The heat dissipation mechanism 19 includes a first heat dissipation outlet 191 and a second heat dissipation outlet 192. The first heat dissipation outlet 191 is provided on the side wall of the upper housing 31, and the second heat dissipation outlet 192 is provided on the side wall of the middle housing 32. By providing the first heat dissipation outlet 191 and the second heat dissipation outlet 192, the heat dissipation performance of the air pump is improved and the service life of the air pump is increased.

[0036] As an improvement to the above technical solution, a scratch-resistant washer 4 is fixedly installed at the bottom of the circular plate 5. The inner wall of the scratch-resistant washer 4 is smooth. The swing arm 24 slides in contact with the scratch-resistant washer 4. By setting the scratch-resistant washer 4 between the inclined swing member 28 and the inner wall of the cylindrical shell 11, the inclined swing member 28 slides in contact with the smooth inner wall of the scratch-resistant washer 4 during the swinging process, which effectively avoids direct scratching between the inclined swing member 28 and the inner wall of the cylindrical shell 11, reduces the noise caused by scratching, and also reduces the wear of the inclined swing member 28 on the inner wall of the cylindrical shell 11 during the swinging process, thus extending the service life of the inclined swing member 28.

[0037] The working principle and usage of this utility model:

[0038] Working principle

[0039] Operation of the drive mechanism: The drive mechanism 2 includes a motor 21, which is installed on one side of the bottom of the cylindrical shell 11. After the motor 21 is started, its output end drives the output gear 26 to rotate. The output gear 26 meshes with the eccentric wheel 22, causing the eccentric wheel 22 to rotate. The rotation of the eccentric wheel 22 is transmitted to the inclined swing member 28 through the eccentric rod 7 and the transmission shaft 23, causing the inclined swing member 28 to swing.

[0040] Piston reciprocating motion for inflation and deflation: The swing of the inclined swing member 28 drives the piston 10 to reciprocate within the piston hole 1 via the swing arm 24 and the connecting ball head 9. When inflation is required, select the appropriate air nozzle 8 and tighten it with the threaded port 13 of the inflation pump. Then, insert the air nozzle 8 into the valve of the product to be inflated and tighten it. When the piston 10 moves downward, the gas in the cylindrical shell 11 enters the upper shell 31 through the one-way valve 16. When the piston 10 moves upward, the gas in the upper shell 31 is compressed and enters the inflated product through the air nozzle 8. This reciprocating motion achieves the inflation function. When deflation is required, select the appropriate air nozzle 8 and tighten it with the threaded port 14 of the deflation pump. Then, insert the air nozzle 8 into the valve of the product to be deflated and tighten it. When the piston 10 moves upward, the gas in the product is extracted. When the piston 10 moves downward, the gas in the cylindrical shell 11 is discharged outward through the one-way valve 16. This reciprocating motion achieves the deflation function.

[0041] How to use

[0042] Inflation: Select the appropriate air nozzle 8 and tighten it with the threaded port 13 of the air pump. Then insert the air nozzle into the valve of the inflatable product and tighten it. Press and hold the power button 172 to turn on the machine, and the display screen 171 will light up. Press the "+" or "-" air pressure adjustment key 173 to set the required inflation pressure value. After completing the above steps, press the power button briefly to start inflation. Press the power button 172 briefly again during inflation to stop inflation. When the inflation pressure reaches the set pressure value, the air pump will stop inflation. After inflation is complete, press and hold the power button 172 to turn off the machine.

[0043] Air extraction: Select the appropriate air nozzle and tighten the threaded port 14 of the air pump. Then insert the air nozzle 8 into the air extraction product valve and tighten it. Press and hold the power switch 172 to turn on the machine, and then press the power switch 172 briefly to start air extraction. During the air extraction process, press the power switch 172 briefly again to stop air extraction. After the air extraction is complete, press and hold the power switch to turn off the machine.

[0044] Charging instructions: When the battery level is below 20%, the indicator light will flash. Please charge it promptly. Charging can be done via the Type-C charging port with a charging voltage of 5V 2A. Alternatively, it can be charged using a car charger cable with a DC head. The indicator light will flash while charging and will remain on when fully charged.

[0045] The above description is only used to illustrate the technical solution of this utility model, and is not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Any equivalent structural or procedural transformations made using the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this utility model.

Claims

1. An air pump, characterized in that: The system includes a housing (3), which includes an intermediate shell (32). The top of the intermediate shell (32) is provided with an upper shell (31), and the bottom of the intermediate shell (32) is provided with a lower shell (33). A drive mechanism (2) is installed inside the housing (3). The drive mechanism (2) is installed inside a cylindrical shell (11). The cylindrical shell (11) is provided with a slanted swing member (28), a piston (10), and a circular plate (5). The top of the circular plate (5) has several piston holes that are longitudinally and annularly oriented at equal angles. (1) The piston (10) is fitted inside the piston hole (1). The drive mechanism (2) is used to drive the inclined swing member (28) to swing and periodically push and pull the piston (10) in reciprocating motion. A through hole (15) is opened through the center of the top of the circular plate (5). A one-way valve (16) is installed in the through hole (15). A suction nozzle threaded port (14) is opened through the top of the upper shell (31). An air inlet threaded port (13) is opened through the bottom of the lower shell (33).

2. An air pump according to claim 1, characterized in that: The upper shell (31) and the lower shell (33) are integrally formed with the middle shell (32), and the air suction nozzle threaded port (14) and the air filling nozzle threaded port (13) can both be connected to air nozzles (8).

3. An air pump according to claim 2, characterized in that: The air nozzle (8) includes a threaded tube end (82), and the threaded opening (14) of the suction nozzle and the threaded opening (13) of the inflation nozzle are threadedly engaged with the threaded tube end (82). An air nozzle end (81) is installed on the top of the threaded tube end (82), and the air nozzle end (81) communicates with the threaded tube end (82).

4. An air pump according to claim 3, characterized in that: The front of the intermediate shell (32) is provided with a control panel (17), which includes an on / off switch (172), a pressure adjustment key (173) and a display screen (171). A controller is installed inside the intermediate shell (32), and the drive mechanism (2) and the control panel (17) are both electrically connected to the controller.

5. An air pump according to claim 4, characterized in that: The side wall of the intermediate shell (32) is provided with an interface structure (18), the interface structure (18) includes an interface slot, a car charger DC head (182) and a Type-C charging port (183) are provided in the interface slot, and a dust plug (181) is detachably attached to the interface slot.

6. An air pump according to claim 5, characterized in that: The outer wall of the housing (3) is provided with a heat dissipation mechanism (19), which includes a first heat dissipation outlet (191) and a second heat dissipation outlet (192). The first heat dissipation outlet (191) is provided on the side wall of the upper housing (31), and the second heat dissipation outlet (192) is provided on the side wall of the middle housing (32).

7. An air pump according to claim 6, characterized in that: The drive mechanism (2) includes a motor (21), which is installed on the bottom side of the cylindrical shell (11). The cylindrical shell (11) is fixedly disposed inside the intermediate shell (32). The output end of the motor (21) passes through the cylindrical shell (11) and is equipped with an output gear (26). An eccentric wheel (22) is rotatably disposed inside the cylindrical shell (11). The eccentric wheel (22) meshes with the output gear (26). A device is mounted above the eccentric wheel (22). An eccentric rod (7) is installed, and an inclined swing member (28) is installed above the eccentric rod (7). An eccentric hole (25) is opened at the top of the eccentric rod (7). The central axis of the eccentric hole (25) forms a certain angle with the rotation axis of the eccentric wheel (22). One end of the drive shaft (23) is inserted into the eccentric hole (25), and the other end of the drive shaft (23) is installed with the inclined swing member (28). The drive shaft (23) is connected to the center position of the inclined swing member (28).

8. An air pump according to claim 7, characterized in that: The inclined swing member (28) has several swing arms (24) evenly fixed on its periphery. The top of the swing arm (24) is provided with a connecting hole (27). The circular plate (5) is fixedly installed inside the upper end of the cylindrical shell (11). The bottom of the piston (10) is fixedly provided with a piston rod. The bottom of the piston rod is fixedly provided with a connecting ball head (9). The connection ball head (9) and the connecting hole (27) cooperate to realize the connection between the piston (10) and the inclined swing member (28).

9. An air pump according to claim 8, characterized in that: The bottom of the eccentric wheel (22) is fixedly provided with a rotating rod (29), which is rotatably installed inside the bottom of the cylindrical shell (11). The bottom of the circular plate (5) is fixedly provided with an anti-scratching washer (4), the inner wall of the anti-scratching washer (4) is smoothly provided, and the swing arm (24) slides in contact with the anti-scratching washer (4).

10. An air pump according to claim 9, characterized in that: A connecting block (6) is fixedly installed on the top of the eccentric wheel (22), and an eccentric rod (7) is fixedly installed on the top of the connecting block (6). An air suction pipe (12) is installed on the other side of the bottom of the cylindrical shell (11). The air suction pipe (12) penetrates the cylindrical shell (11), and the penetration point between the air suction pipe (12) and the cylindrical shell (11) is sealed.

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