CN210178531U

CN210178531U - Internal circulation air pump capable of interchanging air inlet and air outlet

Info

Publication number: CN210178531U
Application number: CN201920783438.XU
Authority: CN
Inventors: Zhiming Liu; 刘之明
Original assignee: Shandong Thailand Exhibition Polytron Technologies Inc
Current assignee: Shandong Thailand Exhibition Polytron Technologies Inc
Priority date: 2019-05-28
Filing date: 2019-05-28
Publication date: 2020-03-24
Anticipated expiration: 2029-05-28

Abstract

The utility model discloses an inner loop air pump that can exchange business turn over gas belongs to air pump technical field, and it disposes first air cock and second air cock, characterized in that on the pump case: a high-pressure cavity and a low-pressure cavity are formed in the pump shell, a cylinder is arranged between the two cavities and provided with an air inlet and an air outlet, the air inlet is communicated with the low-pressure cavity, the air outlet is communicated with the high-pressure cavity, an air inlet control valve is arranged on the air inlet, and an air outlet control valve is arranged on the air outlet; install first solenoid valve in the first air cock, first solenoid valve intercommunication first air flue and second air flue, install the second solenoid valve in the second air cock, second solenoid valve intercommunication third air flue and fourth air flue, first air flue and third air flue all communicate the low pressure chamber, and second air flue and fourth air flue all communicate the high pressure chamber. This pump makes its any air cock be in the state of admitting air, and another air cock is in a high pressure gas state, so realizes gaseous inside two-way circulation in the air suspension to the cylinder all participates in the pressurization and carries work, increases gaseous transport efficiency.

Description

Internal circulation air pump capable of interchanging air inlet and air outlet

Technical Field

The utility model belongs to the technical field of the air pump, concretely relates to inner loop air pump that can exchange business turn over gas.

Background

With the development of the automobile industry technology, in order to enhance the comfort and the stability of the vehicle in the driving process, the air suspension system is widely applied. The air spring is used for buffering vibration from wheels, the air quantity of the air spring is adjusted in real time according to road conditions, the height of the air spring is changed accordingly, and the purpose of stabilizing the height of a vehicle body is achieved.

In practical application, the air charging and discharging states of the air spring are switched by the electromagnetic valve. When the air spring needs to be lifted, the electromagnetic valve opens the air charging branch, and after the air pump sucks the outside air, the air spring is pressurized and pressed in to complete the air charging process; when the air spring needs to be lowered, the electromagnetic valve opens the air discharge nozzle of the air spring, and partial air is discharged to the atmosphere. In the process, the air spring directly discharges part of high-pressure gas into the atmosphere during air exhaust, and the air pump is required to pressurize the sucked atmosphere again during air inflation, so that the working strength of the air pump is increased to a certain extent, the working time is prolonged, the comfort of a vehicle is influenced to a certain extent, and energy waste is caused.

Accordingly, energy-saving solutions have been sought to store the air exhausted from the air spring and then pressurize the air to inflate the air spring. China utility model patent 201621151035 discloses an air suspension closed loop control device for vehicle based on mechanical altitude valve, it stores high-pressure air in air feed gas holder 5, when treating that air spring 7 needs to rise, aerify for air spring 7 through mechanical altitude valve 6 by air feed gas holder 5, when treating that air spring 7 needs to reduce, unnecessary gas then gets into circulation buffer tank 9 through mechanical altitude valve 6 in the air spring 7, when the pressure of circulation buffer tank 9 reaches the predetermined value, then open air pump 1, impress the gas in circulation buffer tank 9 in the air feed gas holder 5, use for treating air spring 7 inflation once more. Although the air supply mode avoids the air in the air spring from being directly discharged into the air, and saves the energy of high-pressure air to a certain extent, the structure is more complex, and the air inflation speed of the air spring is lower.

The chinese patent application 201810091836.5 discloses a passenger car electronic suspension system with a self-recycling air source, which still does not change the essence that the air pump 184 supplies air to the air outlet cylinder 4, and the air outlet cylinder 4 inflates the

air bags

6, 8, 10, and 13.

Disclosure of Invention

The utility model aims to solve the technical problem that an inner loop air pump that can exchange business turn over gas is provided, can realize the interchange of business turn over gas between first air cock and second air cock for same air cock both can regard as the air inlet and can regard as high-pressure gas outlet again.

In order to solve the technical problem, the technical scheme of the utility model is that: the design one kind can exchange the inner loop air pump of air admission and exhaust, including the pump case, dispose first air cock and second air cock on the pump case, its characterized in that:

a high-pressure cavity and a low-pressure cavity are formed in the pump shell, a cylinder is arranged between the high-pressure cavity and the low-pressure cavity and provided with an air inlet and an air outlet, the air inlet is communicated with the low-pressure cavity, the air outlet is communicated with the high-pressure cavity, an air inlet control valve is arranged on the air inlet, and an air outlet control valve is arranged on the air outlet;

install first solenoid valve in the first air cock, first solenoid valve intercommunication first air flue and second air flue, install the second solenoid valve in the second air cock, second solenoid valve intercommunication third air flue and fourth air flue, first air flue and third air flue all communicate the low pressure chamber, second air flue and fourth air flue all communicate the high pressure chamber, first solenoid valve control first air cock switch-on first air flue or second air flue, second solenoid valve control second air cock switch-on third air flue or fourth air flue.

Preferably, the first electromagnetic valve and the second electromagnetic valve have the same structure: the valve body is internally provided with a support, an electromagnetic coil is wound on the support, a valve seat and a valve core are assembled in the support, a first elastic body is assembled between the valve seat and the valve core, the valve core is internally provided with vent holes which penetrate through two ends of the valve core, one end of the valve core can abut against the valve seat, the other end of the valve core is provided with an extending section which extends out of the valve seat, the end part of the extending section is provided with a valve nozzle, the outer wall of the valve core is provided with a vent groove, the valve body is provided with;

a first electromagnetic valve: the valve nozzle is connected with the first air nozzle, the air passing hole is connected with the first air passage, and the extending section can be positioned at the second air passage;

a second electromagnetic valve: the valve nozzle is connected with the second air nozzle, the air passing hole is connected with the third air passage, and the extending section can be located at the fourth air passage.

Preferably, a sealing gasket is arranged on the valve seat and can block the vent hole.

Preferably, a sealing ring is assembled on the valve nozzle.

Preferably, the high-pressure cavity is internally provided with a high-pressure air pipe, the high-pressure air pipe divides the high-pressure cavity into a first high-pressure cavity and a second high-pressure cavity, the second high-pressure cavity is filled with a drying agent, the second high-pressure cavity is communicated with a fourth air passage, and the first high-pressure cavity is communicated with the second air passage.

Preferably, a first check valve is arranged between the second high-pressure cavity and the fourth air passage, and air in the second high-pressure cavity can enter the fourth air passage.

Preferably, a second check valve is arranged between the first air passage and the low pressure cavity and between the third air passage and the low pressure cavity, and the air in the first air passage and the third air passage can enter the low pressure cavity.

Preferably, the cylinder comprises a cylinder barrel, a piston is arranged in the cylinder barrel, a piston rod is arranged on the piston, the piston rod is arranged on an eccentric wheel, the eccentric wheel is arranged on a rotating shaft of the power rotating device in a matching mode, the power rotating device is arranged in the low-pressure cavity, the air inlet is formed in the piston, and the air outlet is formed in the end wall of the cylinder barrel.

Preferably, still install the pressure limiting valve on the lateral wall in high-pressure chamber, the pressure limiting valve is including seting up the first inner chamber in the pump case, and first inner chamber intercommunication is lost heart and exhaust hole, and the hole that loses heart communicates high-pressure chamber, and the exhaust hole communicates the external world, sets up first valve plug in the first inner chamber, and the one end of first valve plug can block up on the hole that loses heart, the other end passes through the second elastomer and couples on the pump case.

Preferably, still set up the tonifying qi mouth on the pump case, set up the gulp valve in the tonifying qi mouth, the gulp valve is including seting up the second inner chamber in the pump case, and the second inner chamber has the tonifying qi mouth in intercommunication low-pressure chamber and communicates external inlet port, sets up the second valve plug in the second inner chamber, and the one end of second valve plug can the shutoff on the inlet port, the other end passes through the third elastomer hookup on the pump case.

Preferably, the power rotating device is a motor.

Preferably, the first elastic body, the second elastic body and the third elastic body are all springs.

Preferably, the air inlet control valve and the air outlet control valve are elastic valve plates.

Compared with the prior art, the beneficial effects of the utility model are that:

1. because high-pressure chamber and low pressure chamber have been seted up in the pump case, and set up the cylinder between high-pressure chamber and the low pressure chamber, can supply with high-pressure chamber after the gas pressurization in the low pressure chamber, operating condition through controlling first solenoid valve and second solenoid valve, switch first air cock and second air cock and admit air or give vent to anger, make wherein any air cock be in the state of admitting air, and another air cock is in the high pressure state of giving vent to anger, so realize gaseous inside two-way circulation in the air suspension, and the cylinder all participates in the pressurization and carries work, gaseous conveying efficiency has been increased.

2. Because the valve core is internally provided with the vent holes which penetrate through two ends of the valve core, one end of the valve core can abut against the valve seat, the other end of the valve core is provided with the extending section which extends out of the valve seat, the end part of the extending section is provided with the valve nozzle, the switching of the gas circuit can be realized by depending on the stretching of the valve nozzle, the gas circuit structure can be simplified, the gas circulation is ensured to be smoother, the structure of the pump body is more compact, and the occupied space.

3. Because set up sealed the pad on the disk seat, sealed pad can block up the air vent, can increase the leakproofness that the air vent was blocked, avoids the phenomenon of mixing of gases to take place.

4. Because the valve nozzle is provided with the sealing ring, the connection sealing performance between the valve nozzle and the first air nozzle or the second air nozzle can be enhanced, and the phenomenon of air leakage is avoided.

5. Because set up high-pressure air pipe in the high-pressure chamber, high-pressure air pipe cuts apart the high-pressure chamber into first high-pressure chamber and second high-pressure chamber, and it has the drier to fill in the second high-pressure chamber, and second high-pressure chamber intercommunication fourth air flue, first high-pressure chamber intercommunication second air flue for can export the high-pressure gas through drying all the way, make it get into the higher equipment of gaseous drying degree requirement, do benefit to and prolong its life.

6. Because set up first check valve between second high-pressure chamber and fourth gas channel, only allow the gas in the second high-pressure chamber to get into in the fourth gas channel, otherwise then the obstructed, avoid the gas in the air suspension equipment to enter the pump body from the high-pressure side.

7. Because all install the second check valve between first air flue and the low pressure chamber and between third air flue and the low pressure chamber for only allow the gas in first air flue and the third air flue to get into the low pressure chamber, avoid gaseous reflux.

8. The power rotating device rotates to drive the piston to reciprocate, so that air suction, compression and exhaust are completed, the air inlet control valve and the air outlet control valve are arranged, the air inlet control valve can be opened for air inlet only when the piston is pulled out, the air inlet control valve is closed when compressed air is pushed in, the air outlet control valve can be pushed open when the compressed air reaches certain strength, and pressurized high-pressure air is exhausted.

9. Because the side wall of the high-pressure cavity is also provided with the pressure limiting valve, the overhigh pressure in the cavity can be avoided, and the service life of the high-pressure cavity can be prolonged.

10. Because the pump shell is also provided with the air supplementing nozzle, and the air supplementing valve is arranged in the air supplementing nozzle, the automatic air supplementing can be completed when the pressure in the low-pressure cavity is lower, and the normal operation of the pump body is ensured.

11. The utility model discloses simple structure can realize that the gaseous two-way pressurization between first air cock and second air cock flows, really accomplishes air suspension system's gaseous inner loop, and the energy saving does benefit to the life of extension air pump, is convenient for in industry popularize and apply.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is an enlarged sectional view taken along line A-A of FIG. 1;

FIG. 3 is an enlarged sectional view taken along line B-B of FIG. 1;

FIG. 4 is a view in the direction C of FIG. 1;

FIG. 5 is a cross-sectional view taken along line D-D of FIG. 4;

FIG. 6 is an enlarged view of detail I of FIG. 5;

FIG. 7 is an enlarged view of detail II of FIG. 5;

FIG. 8 is a cross-sectional view E-E of FIG. 5;

FIG. 9 is a cross-sectional view F-F of FIG. 5;

FIG. 10 is an enlarged view of detail III of FIG. 9;

FIG. 11 is a schematic view showing the structure of the first and second solenoid valves

FIG. 12 is a sectional view taken along line G-G of FIG. 11;

fig. 13 is a sectional view taken along line H-H in fig. 12.

The labels in the figure are: 1. a pump housing; 2. a pressure limiting valve; 3. a second air tap; 4. a first air tap; 5. a gas supplementing nozzle; 6. a high-pressure air pipe; 7. a second air passage; 8. a fourth airway; 9. a first solenoid valve; 10. a second solenoid valve; 11. a first high pressure chamber; 12. a second high pressure chamber; 13. a motor; 14. a low pressure chamber; 15. an air supply valve; 16. a cylinder barrel; 17. an eccentric wheel; 18. a piston rod; 19. a piston; 20. an air inlet; 21. an air intake control valve; 22. an air outlet; 23. an air outlet control valve; 24. a second lumen; 25. a second valve plug; 26. a third spring; 27. air hole supplement; 28. a first air passage; 29. a third air passage; 30. air holes are formed; 31. a second one-way valve; 32. a first check valve; 33. a valve cavity; 34. a floating ball; 35. a sealing plate; 36. a valve body; 37. a valve nozzle; 38. a seal ring; 39. an electromagnetic coil; 40. a vent channel; 41. a support; 42. a valve core; 43. a vent hole; 44. air passing holes; 45. a valve seat; 46. a gasket; 47. a first spring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 3 and 5, the utility model discloses high pressure chamber and low pressure chamber 14 have been seted up in pump case 1, set up the cylinder between high pressure chamber and the low pressure chamber 14, as shown in fig. 6, equip piston 19 in the cylinder 16 of cylinder, set up piston rod 18 on the piston 19, piston rod 18 is installed on eccentric wheel 17, eccentric wheel 17 is assembled in the pivot of motor 13, motor 13 sets up in low pressure chamber 14, air inlet 20 has been seted up on the piston 19, air inlet 20 communicates low pressure chamber 14, set up air control valve 21 on the air inlet 20, set up gas outlet 22 on the end wall of cylinder 16, gas outlet 22 communicates high pressure chamber, set up air control valve 23 on the gas outlet 22. As shown in fig. 2 and 8, a first air passage 28, a second air passage 7, a third air passage 29 and a fourth air passage 8 are formed in the valve housing, the first air passage 28 and the third air passage 29 are communicated with the low-pressure cavity 14, and the second air passage 7 and the fourth air passage 8 are communicated with the high-pressure cavity. As shown in fig. 1 and 4, a first air nozzle 4 and a second air nozzle 3 are arranged on the pump housing 1, a first electromagnetic valve 9 is installed in the first air nozzle 4, a second electromagnetic valve 10 is installed in the second air nozzle 3, and the first electromagnetic valve 9 and the second electromagnetic valve 10 have the same structure, as shown in fig. 11, 12 and 13, specifically as follows:

a support 41 is arranged in a valve body 36, an electromagnetic coil 39 is wound on the support 41, a valve seat 45 and a valve core 42 are arranged in the support 41, one end of the valve core 42 close to the valve seat 45 is in a taper shape, a first spring 47 is arranged between the valve seat 45 and the valve core 42, a vent hole 43 penetrating through two ends of the valve core 42 is arranged in the valve core 42, one end of the valve core 42 can abut against the valve seat 45, a sealing gasket 46 is arranged on the valve seat 45, the vent hole 43 can be blocked by the sealing gasket 46, the other end of the valve core 42 is provided with an extending section extending out of the valve seat 45, a valve nozzle 37 is arranged at the end part of the extending section, a sealing ring 38 is arranged on the valve nozzle 37, a vent groove 40 is arranged on the outer wall.

The valve mouth 37 of the first electromagnetic valve 9 is connected with the first air mouth 4, the air hole 44 of the first electromagnetic valve is connected with the first air passage 28, and the extending section can be positioned at the second air passage 7 and used for controlling the first air mouth 4 to be communicated with the first air passage 28 or the second air passage 7. The valve nozzle 37 of the second electromagnetic valve 10 is connected with the second air nozzle 3, the air passing hole 44 of the second electromagnetic valve is connected with the third air passage 29, and the extending section of the second electromagnetic valve can be located at the fourth air passage 8 and is used for controlling the second air nozzle 3 to be communicated with the third air passage 29 or the fourth air passage 8.

In order to enable the second nozzle 3 to output dry high-pressure gas, as shown in fig. 9, the utility model discloses still set up high-pressure pipe 6 in the high-pressure chamber, high-pressure pipe 6 is split into first high-pressure chamber 11 and second high-pressure chamber 12 with the high-pressure chamber, first high-pressure chamber 11 is the inner chamber of high-pressure pipe 6, it has the drier to fill in the second high-pressure chamber 12, second high-pressure chamber 12 communicates fourth gas passage 8, as shown in fig. 10, set up the valve chamber 33 of first check valve 32 on the pump case 1 between second high-pressure chamber 12 and fourth gas passage 8, set up floater 34 in the valve chamber 33, set up sealing plate 35 on the valve chamber 33, set up the bleeder vent 30 of intercommunication second high-pressure chamber 12 on the sealing plate 35, floater 34 can block up on bleeder vent 30 completely, so the gas in the second high-pressure chamber 12 can only one-way get into in the fourth gas passage 8. The first high pressure chamber 11 communicates with the second gas duct 7. Second check valves 31 are arranged between the first air passage 28 and the low pressure cavity 14 and between the third air passage 29 and the low pressure cavity 14, and air in the first air passage 28 and the third air passage 29 can only enter the low pressure cavity 14 in a one-way mode.

In order to prevent the service life of the high-pressure cavity from being influenced by overhigh air pressure, the side wall of the high-pressure cavity is further provided with a pressure limiting valve 2, the pressure limiting valve 2 is provided with a first inner cavity in the pump shell 1, the first valve shell is provided with an air leakage hole and an air exhaust hole, the air leakage hole is communicated with the high-pressure cavity, the air exhaust hole is communicated with the outside, the first inner cavity is internally provided with a first valve plug, one end of the first valve plug can be blocked on the air leakage hole, and the other end of the first valve plug is connected to the pump shell. Still set up air supplement mouth 5 on pump case 1, set up air supplement valve 15 in the air supplement mouth 5, as shown in fig. 7, air supplement valve 15 has second inner chamber 24 in pump case 1, second inner chamber 24 has the tonifying qi hole 27 and the external inlet port of intercommunication that communicates of intercommunication low-pressure chamber 14, sets up second valve plug 25 in the second inner chamber 24, and the one end of second valve plug 25 can block off on the inlet port, and the other end passes through third spring 25 and couples on pump case 1.

The air inlet control valve 21 and the air outlet control valve 23 may be elastic valve plates with simple structures, may be one-way control valves of other forms, as long as one-way control can be realized, and do not have specific requirements on the structures. The second check valve 31 is similar to the gulp valve 15, and will not be described in detail herein.

The working process of the utility model is as follows:

the internal circulation pump is used in an air suspension system, a first air nozzle 4 of the internal circulation pump is used for being connected with an air storage tank, and a second air nozzle 3 of the internal circulation pump is used for being connected with an air spring. When the air spring needs to be lowered and adjusted, the second electromagnetic valve 10 is controlled to be in a power-off state, at this time, the valve core 42 is supported by the first spring 47 and is separated from the valve seat 45, so that the valve nozzle 37 extends out, and is closely attached to the second air nozzle 3, the fourth air passage 8 is isolated and blocked, the air discharged by the air spring can only enter the vent hole 43 of the valve core 42 through the second air nozzle 3, enters the vent groove 40 from the separated part with the valve seat 45, reaches the vent hole 44, enters the third air passage 29 from the vent hole 44, pushes open the second one-way valve 31 in the air passage, enters the low-pressure chamber 14, the motor 13 drives the piston rod 18 to be pulled out, the air pressure in the cylinder 16 is suddenly reduced, so that the air in the air inlet control valve 21 is opened, the air in the low-pressure chamber 14 enters the air inlet 20 on the piston 19, enters the working chamber of the cylinder 16, the volume of the working chamber is not continuously increased, and, the intake control valve 21 is closed; when the piston rod 18 is pushed back, the volume of the working chamber is reduced, the gas in the working chamber is compressed, and when the certain strength is reached, the gas outlet control valve 23 is pushed open and pressed into the high-pressure chamber, at this time, because the fourth gas passage 8 is not communicated, the gas in the high-pressure chamber can only enter the first high-pressure chamber 11 and reaches the first electromagnetic valve 9 through the second gas passage 7, the first electromagnetic valve 9 is controlled to be powered, the valve core 42 of the first electromagnetic valve moves to the valve seat 45 by overcoming the elastic force of the first spring 47 under the action of the electromagnetic force, the vent hole 43 is blocked on the valve seat 45, the valve nozzle 37 is separated from the connection with the first valve nozzle 4, the isolation blocking effect on the second gas passage 7 is lost, and the high-pressure gas enters the first valve nozzle 4 and is discharged into the gas.

When the air spring needs to supplement air and rise, the first electromagnetic valve 9 is controlled to be in a power-off state, at the moment, the valve core 42 is supported by the first spring 47 and is separated from the valve seat 45, so that the valve nozzle 37 extends out, and is closely attached to the first air nozzle 4 to isolate and block the second air passage 7, the air in the air storage tank can only enter the vent hole 43 of the valve core 42 through the first air nozzle 4, enters the vent groove 40 from the separation part with the valve seat 45, reaches the vent hole 44, enters the first air passage 28 from the vent hole 44, jacks up the second one-way valve 31 in the air passage, enters the low-pressure chamber 14, the air cylinder works to press the air in the low-pressure chamber 14 into the high-pressure chamber, at the moment, because the second air passage 7 is not communicated, the air in the high-pressure chamber can only enter the second high-pressure chamber 12, opens the first one-way valve 32 after drying, reaches the second electromagnetic valve 10 through the fourth air passage 8, and controls the, under the action of electromagnetic force, the valve core 42 overcomes the elastic force of the first spring 47 and moves towards the valve seat 45, the vent hole 43 is blocked on the valve seat 45, the valve nozzle 37 is separated from the connection with the second air nozzle 3, and the isolation blocking effect on the fourth air channel 8 is lost, so that high-pressure gas enters the second air nozzle 3 and is filled into the air spring.

So realize the two-way quick circulation of the gas in the air suspension system between gas holder and air spring, realize the internal cycle, avoided the loss of pressure energy, reduced the air pump time of recompressing air for the air spring tonifying qi to the air pressure also is higher than the ordinary pressure in the low-pressure chamber 14, has reduced the pressure differential on the piston 19, has reduced the work atress of piston 19, has both helped to prolong the life of piston 19, has reduced the power of motor 13 again.

When the air spring does not need to be adjusted in height, the electromagnetic valve on the air spring is in a closed state, the first electromagnetic valve 9, the second electromagnetic valve 10 and the air cylinder are in a power-off state, no air flows in and out of the second air nozzle 3, the first air nozzle 4 is communicated with the low-pressure cavity 14, and no air flow power exists.

In the process, the gas in the low-pressure cavity 14 is less, and when the gas is lower than the preset value, the gas supplementing valve 15 is automatically opened under the action of pressure difference, and the gas is supplemented into the low-pressure cavity 14 through the gas supplementing nozzle 5; when the air pressure in the high-pressure cavity exceeds a preset value, the pressure limiting valve 2 is jacked open to release pressure until the air pressure is lower than the preset value, and the pressure limiting valve is automatically closed.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides an inner loop air pump that can trade business turn over gas, includes the pump case, disposes first air cock and second air cock on the pump case, its characterized in that:

2. The air pump of claim 1, wherein the air pump comprises: the first electromagnetic valve and the second electromagnetic valve have the same structure as that of the first electromagnetic valve and that of the second electromagnetic valve: the valve body is internally provided with a support, an electromagnetic coil is wound on the support, a valve seat and a valve core are assembled in the support, a first elastic body is assembled between the valve seat and the valve core, the valve core is internally provided with vent holes which penetrate through two ends of the valve core, one end of the valve core can abut against the valve seat, the other end of the valve core is provided with an extending section which extends out of the valve seat, the end part of the extending section is provided with a valve nozzle, the outer wall of the valve core is provided with a vent groove, the valve body is provided with;

3. The air pump of claim 2, wherein the air pump comprises: the valve seat is provided with a sealing gasket which can block the vent hole.

4. An internal circulation air pump interchangeable for inlet and outlet air according to claim 3, wherein: and a sealing ring is assembled on the valve nozzle.

5. The air pump of claim 1, wherein the air pump comprises: the high-pressure cavity is internally provided with a high-pressure air pipe, the high-pressure air pipe divides the high-pressure cavity into a first high-pressure cavity and a second high-pressure cavity, a drying agent is filled in the second high-pressure cavity, the second high-pressure cavity is communicated with a fourth air passage, and the first high-pressure cavity is communicated with the second air passage.

6. The air pump of claim 5, wherein the air pump comprises: a first one-way valve is arranged between the second high-pressure cavity and the fourth air passage, and air in the second high-pressure cavity can enter the fourth air passage.

7. The air pump of claim 6, wherein the air pump comprises: second check valves are installed between the first air passage and the low-pressure cavity and between the third air passage and the low-pressure cavity, and gas in the first air passage and the third air passage can enter the low-pressure cavity.

8. The air pump of any one of claims 1 to 7, wherein: the air cylinder comprises a cylinder barrel, a piston is arranged in the cylinder barrel, a piston rod is arranged on the piston, the piston rod is arranged on an eccentric wheel, the eccentric wheel is arranged on a rotating shaft of a power rotating device, the power rotating device is arranged in a low-pressure cavity, an air inlet is formed in the piston, and an air outlet is formed in the end wall of the cylinder barrel.

9. The air pump of any one of claims 1 to 7, wherein: the pressure limiting valve is further mounted on the side wall of the high-pressure cavity and comprises a first inner cavity arranged in the pump shell, the first inner cavity is communicated with the air leakage hole and the air exhaust hole, the air leakage hole is communicated with the high-pressure cavity, the air exhaust hole is communicated with the outside, a first valve plug is arranged in the first inner cavity, one end of the first valve plug can be plugged on the air leakage hole, and the other end of the first valve plug is connected to the pump shell through a second elastic body.

10. The air pump of any one of claims 1 to 7, wherein: still set up the tonifying qi mouth on the pump case, set up the tonifying qi valve in the tonifying qi mouth, the tonifying qi valve is including seting up the second inner chamber in the pump case, and the second inner chamber has the tonifying qi hole of intercommunication low pressure chamber and communicates external inlet port, sets up the second valve plug in the second inner chamber, and the one end of second valve plug can the shutoff on the inlet port, and the other end passes through the third elastomer hookup on the pump case.