CN217761235U - Air pump with filtering - Google Patents

Abstract

The utility model discloses an air pump with filtration belongs to varactor formula machinery technical field, and it includes motor, compression cylinder and drying cabinet, and compression cylinder is by motor drive, characterized in that: still include the filtration jar that connects in order around one or two more, be equipped with filter equipment in the filtration jar, filter equipment will filter the jar and separate air chamber and the filter chamber that distributes around for, the air chamber intercommunication air inlet of foremost, the filter chamber intercommunication compression cylinder of rearmost end, compression cylinder's other end intercommunication drying cabinet, the gas outlet has been seted up to the other end of drying cabinet. The air pump is provided with the filter tanks, so that gas to be fed into the air pump can be filtered in advance, the cleanliness of the air is improved, the service life of the air pump is prolonged, and the filtering effect can be further improved through a cascade structure of more than two filter tanks.

Description

Air pump with filtering

Technical Field

The utility model belongs to the technical field of varactor formula machinery, concretely relates to air pump with filter.

Background

With the development of the automobile industry technology, the air suspension technology is gradually perfected and is gradually applied to the suspension system of the vehicle. The air spring is used for buffering vibration from wheels, the air pressure of the air spring is adjusted in real time according to road conditions, the hardness of the air spring is changed accordingly, and the purposes of improving comfort and stability of a vehicle in the driving process are achieved. In practical applications, an air pump generally supplies compressed air to the air spring to adjust the elastic coefficient of the air spring. When the air spring needs to be hardened, the air pump works, and air is compressed and then is filled into the air spring; when the air spring needs to be softened, part of the compressed air is released.

Chinese utility model patent CN201721006531 discloses a secondary compressed air pump, which has a very high working efficiency, but does not solve the problem that foreign matters in the air easily enter the air pump, thereby increasing the failure rate of the air pump and reducing the service life of the air pump.

Disclosure of Invention

The utility model aims to solve the technical problem that a gaseous that gets into the air pump can be filtered to the air pump with filterable.

In order to solve the technical problem, the technical scheme of the utility model is that: the design one kind has filterable air pump, including motor, compression cylinder and drying cabinet, compression cylinder is by motor drive, its characterized in that: still include the filtration jar that connects in order around one or two more, be equipped with filter equipment in the filtration jar, filter equipment will filter the jar and separate air chamber and the filter chamber that distributes around for, the air chamber intercommunication air inlet of foremost, the filter chamber intercommunication compression cylinder of rearmost end, compression cylinder's other end intercommunication drying cabinet, the gas outlet has been seted up to the other end of drying cabinet.

Furthermore, the compression cylinder comprises a cylinder shell, a first-stage cylinder cavity, a connecting cavity and a second-stage cylinder cavity which are sequentially communicated are formed in the cylinder shell, the radial cross section of the second-stage cylinder cavity is smaller than that of the first-stage cylinder cavity, the connecting cavity is communicated with the filtering cavity, a first-stage piston is assembled in the first-stage cylinder cavity, the first-stage cylinder cavity is divided into a first-stage rod cavity and a first-stage rodless cavity by the first-stage piston, a first-stage air inlet hole is formed in the first-stage piston and communicated with the first-stage rod cavity and the first-stage rodless cavity, a first check valve capable of switching on and off the first-stage air inlet hole is arranged on the first-stage air inlet hole, and a first-stage air outlet hole is further communicated with the first-stage rodless cavity;

a secondary piston is assembled in the secondary cylinder cavity, the secondary piston divides the secondary cylinder cavity into a secondary rod cavity and a secondary rodless cavity, a secondary air inlet hole is communicated with the secondary rodless cavity, the secondary air inlet hole is communicated with a primary air outlet hole through an air flow channel, a second one-way valve capable of switching on and off the secondary air inlet hole is arranged on the secondary air inlet hole, a secondary air outlet hole is formed in the side wall of the secondary rodless cavity, the secondary air outlet hole is communicated with the drying tank, and a third one-way valve capable of switching on and off the secondary air outlet hole is arranged on the secondary air outlet hole;

a piston rod is connected between the first-stage piston and the second-stage piston, the piston rod is hinged to a connecting rod, the other end of the connecting rod is hinged to an eccentric shaft, and the eccentric shaft is fixed to a rotating shaft of the motor.

Furthermore, the first check valve is a first valve plate capable of expanding towards the direction of the primary rodless cavity, and the second check valve is a second valve plate capable of expanding towards the direction of the secondary rodless cavity.

Furthermore, the third check valve includes the second elastomer, and second elastomer one end is connected with the pressure-equalizing cover, and the valve plug is connected to the other end, and the valve plug can the shutoff on the second grade venthole.

Furthermore, the primary air outlet hole is formed in the primary piston, the secondary air inlet hole is formed in the secondary piston, and the airflow channel is formed in the piston rod.

Further, the drying tank comprises a tank body, an upper baffle and a lower baffle are arranged in an inner cavity of the tank body, the inner cavity of the tank body is divided into a first cavity, a drying cavity and a second cavity which are sequentially arranged from top to bottom by the upper baffle and the lower baffle, the first cavity is communicated with the second-level air outlet hole, the second cavity is communicated with the air outlet, a first elastic body connected with the upper baffle is installed in the first cavity, a drying agent is filled in the drying cavity, and through holes are formed in the upper baffle and the lower baffle.

Furthermore, a pressure equalizing cover is installed in the first cavity, an air distribution cavity is formed by the pressure equalizing cover and the upper baffle plate in a surrounding mode, a gas passing hole is formed in the pressure equalizing cover, one end of the gas passing hole is communicated with the second-stage air outlet hole, and the other end of the gas passing hole is communicated with the air distribution cavity.

Furthermore, the air outlet is communicated with an exhaust branch, and an electromagnetic switch valve and a residual pressure control valve are sequentially arranged in the exhaust branch.

Further, the residual pressure control valve is an elastic plug which is plugged in the exhaust branch.

Furthermore, the outer wall of the compression cylinder is provided with radiating fins.

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

1. the air pump is provided with the filter tanks, so that the gas to be introduced into the air pump can be filtered in advance, the cleanliness of the air is improved, the service life of the air pump is prolonged, and the filtering effect can be further improved through a cascade structure of more than two filter tanks.

2. The cylinder is internally provided with the first-stage piston and the second-stage piston which are connected, and the first-stage piston and the second-stage piston move towards the same direction in the cylinder at the same time, so that the first-stage rodless cavity and the second-stage rodless cavity can alternately suck air and compress the air, one cylinder cavity is always in a working state, the working efficiency is improved, the second-stage rodless cavity is used for carrying out secondary pressurization on the gas pressurized by the first-stage rodless cavity, the strength of compressed air is improved, and the continuity of compression work is also realized.

3. Because the piston rod is connected between the first-stage piston and the second-stage piston, the piston rod is hinged on the connecting rod, the other end of the connecting rod is hinged on the eccentric shaft, and the eccentric shaft is fixed on the rotating shaft of the motor, the rotating motion of the motor can be converted into the linear motion of the piston when the rotating shaft of the motor rotates, so that the piston reciprocates at a high speed, and the working efficiency of the air pump is improved.

4. Because first check valve is the first valve block that can open to one-level rodless chamber direction, and the second check valve is the second valve block that can open to second grade rodless chamber direction, can rely on the pressure change that one-level piston and second grade piston removal lead to come the automatic start-stop valve block, the control of being convenient for to can reach one-way intercommunication effect well under compact structure's the condition.

5. Because the third check valve includes the second elastomer, second elastomer one end is connected with the pressure-equalizing cover, the other end is connected the valve plug, and the valve plug can the shutoff on the second grade venthole, can be when atmospheric pressure grow in compression cylinder, and the valve plug is backed down by the air, makes the one-way inflow drying cylinder of air, is convenient for control again in simple structure.

6. Because the first-stage air outlet hole is formed in the first-stage piston, the second-stage air inlet hole is formed in the second-stage piston, and the airflow channel is formed in the piston rod and integrated in the piston rod, the structure of the piston rod is simplified, and the overall structure of the air cylinder is more compact.

7. Because install the first elastomer of connecting the overhead gage in the first cavity, it has the drier to fill in the drying chamber, and the through-hole has all been seted up on overhead gage and the lower baffle, can promote the overhead gage and remove when the drier in the drying cylinder absorbs water inflation and volume grow, satisfies the certain volume change space of drier, improves the adsorption capacity of moisture.

8. Because install the pressure-equalizing cover in the first cavity, the pressure-equalizing cover encloses with last baffle and is equipped with the gas distribution chamber, has seted up the gas pocket on the pressure-equalizing cover, will follow the air dispersion that the second grade venthole got into the drying cylinder and open, makes the air that gets into the drying cylinder more even, realizes even gas distribution, improves drying effect.

9. Because the air outlet is communicated with the exhaust branch, the exhaust branch is sequentially provided with the electromagnetic switch valve and the residual pressure control valve, the electromagnetic switch valve is opened when the air spring needs to exhaust, the air spring is convenient to exhaust, and the residual pressure control valve can be closed when the air flow of the exhaust branch is reduced, so that part of residual air is reserved in the air spring, and the service life of the air spring is prolonged.

10. Because the residual pressure control valve is an elastic plug blocked in the exhaust branch, the residual pressure control valve can be automatically opened and closed when the air flow in the exhaust branch is increased and reduced, so that the air quantity in the air spring is kept in a reasonable range.

11. Because be equipped with radiating fin on compression cylinder's the outer wall, can help compression cylinder to give off the heat, help the compression cylinder cooling in the work.

12. The utility model discloses can reduce the air that gets into the air pump and to the carrying volume of foreign matter, avoid the foreign matter to block up or harm compression cylinder and drying cabinet, be favorable to the continuous normal operating of air pump, be convenient for in industry use widely.

Drawings

Fig. 1 is a schematic perspective view of the present invention;

FIG. 2 is a view in the direction A of FIG. 1;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 2;

FIG. 4 is a schematic view of the compression cylinder;

FIG. 5 is a schematic view of the structure of the drying cylinder;

FIG. 6 is a schematic structural view of the piston assembly;

FIG. 7 is an enlarged view of FIG. 6 from direction C;

fig. 8 is an enlarged view of fig. 6 from direction D.

The mark in the figure is: 1. a compression cylinder; 2. a drying tank; 3. a motor; 4. a primary filtration tank; 5. a secondary filtration tank; 6. an air chamber; 7. a filter chamber; 8. an air inlet; 9. a first pipeline; 10. a second pipeline; 11. an air outlet; 12. an upper connecting plate; 13. a lower connecting plate; 14. a heat dissipating fin; 15. a connecting cavity; 16. a primary piston; 17. a piston rod; 18. a secondary piston: 19. a first-stage rod cavity; 20. a primary rodless cavity; 21. a second-stage rod cavity; 22. a secondary rodless cavity; 23. an air flow channel; 24. a primary air inlet; 25. a first valve plate; 26. a primary air outlet; 27. an air distribution cavity; 28. a secondary air inlet; 29. a second valve plate; 30. a secondary air outlet; 31 a valve plug; 32. a second spring; 33. an eccentric shaft; 34. a connecting rod; 35. a tank body; 36. an upper baffle plate; 37. a lower baffle plate; 38. a first spring; 39. a voltage-equalizing cover; 40. residual pressure control valves; 41. an electromagnetic on-off valve; 42. an exhaust branch; 43. a first cavity; 44. a drying chamber; 45. a second cavity.

Detailed Description

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

The utility model, with reference to the placing direction of fig. 1, defines the end far from the ground as the upper part or the upper end, and correspondingly defines the end near the ground as the lower part or the lower end; and referring to the flow direction of the air from front to back, the air inlet end is defined as the front end, and correspondingly the air outlet end is defined as the back end.

As shown in fig. 1, fig. 2 and fig. 3, the compression cylinder 1 of the present invention is driven by the motor 3 connected to the compression cylinder 1, and the motor 3 and the drying tank 2 are respectively provided with a first-stage filtering tank 4 and a second-stage filtering tank 5 on both sides. The primary filtering tank 4 and the secondary filtering tank 5 are internally provided with filtering devices, and the filtering devices divide the filtering tanks into an air cavity 6 and a filtering cavity 7 which are distributed in the front and the back. The air inlet 8 that communicates outside atmosphere is seted up to the air chamber 6 of one-level filtration jar 4, and the filter chamber 7 of one-level filtration jar 4 is through the air chamber 6 of first pipeline 9 intercommunication second grade filtration jar 5, and the filter chamber 7 of second grade filtration jar 5 is through second pipeline 10 intercommunication compression cylinder 1, and compression cylinder 1's the other end intercommunication retort 2, and gas outlet 11 has been seted up to the other end of retort 2. The upper end covers of the first-stage filter tank 4 and the second-stage filter tank 5 are connected into a whole to form an upper connecting plate 12; the lower end covers of the first-stage filtering tank 4 and the second-stage filtering tank 5 are connected into a whole to form a lower connecting plate 13. The air inlet 8 passes through the upper connecting plate 12 and leads to the outside, the first pipeline 9 is positioned on the outer side of the lower connecting plate 13, the second pipeline 10 is positioned on the outer side of the upper connecting plate 12, and the motor 3, the compression cylinder 1 and the drying tank 2 are fixed between the upper connecting plate 12 and the lower connecting plate 13.

The structure of the compression cylinder 1 is as follows: as shown in fig. 4, the outer wall of the compression cylinder 1 is provided with a heat dissipation fin 14 which is of an integrated structure with the compression cylinder 1, the compression cylinder 1 is provided with a first-stage cylinder cavity, a connection cavity 15 and a second-stage cylinder cavity which are sequentially communicated, the connection cavity 15 is communicated with a second pipeline 10, the first-stage cylinder cavity and the second-stage cylinder cavity are distributed in a relative manner, and the radial cross section of the second-stage cylinder cavity is smaller than that of the first-stage cylinder cavity. A primary piston 16 is assembled in the primary cylinder cavity, and the primary piston 16 is connected with one end of a piston rod 17; a secondary piston 18 is arranged in the secondary cylinder cavity, and the secondary piston 18 is connected with the other end of the piston rod 17. The primary piston 16 divides the primary chamber into a primary rod chamber 19 and a primary rodless chamber 20, and the secondary piston 18 divides the secondary chamber into a secondary rod chamber 21 and a secondary rodless chamber 22. An air flow passage 23 communicating the primary rodless chamber 20 and the secondary rodless chamber 22 is formed in the piston rod 17.

As shown in fig. 7, two primary air inlets 24 are formed in the primary piston 16, the primary air inlets 24 communicate the primary rodless cavity 20 with the primary rod-shaped cavity 19, a first valve plate 25 covering the primary air inlets 24 is mounted on an end wall of the primary piston 16 facing the primary rodless cavity 20, and the first valve plate 25 can only open towards the primary rodless cavity 20, so that air can only enter the primary rodless cavity 20 through the primary air inlets 24 in one direction. The primary piston 16 is further provided with a primary air outlet 26, one end of the primary air outlet 26 is communicated with the primary rodless cavity 20, and the other end of the primary air outlet 26 is communicated with an air flow passage 23 formed in the piston rod 17.

As shown in fig. 8, the secondary piston 18 is provided with a secondary air intake hole 28, one end of the secondary air intake hole 28 communicates with the secondary rodless chamber 22, and the other end communicates with the air flow passage 23 provided in the piston rod 17. And a second valve plate 29 is arranged on the end wall of the secondary piston 18 facing the secondary rodless cavity 22, the second valve plate 29 can seal the secondary air inlet hole 28, and the second valve plate 29 can only open towards the secondary rodless cavity 22, so that air can only enter the secondary rodless cavity 22 through the secondary air inlet hole 28 in one direction.

As shown in fig. 4, a secondary air outlet 30 communicated with the drying cylinder 2 is formed in the side wall of the secondary rodless cavity 22, a valve plug 31 is plugged on the secondary air outlet 30, the valve plug 31 is connected with a second spring 32, the other end of the second spring 32 is connected with a pressure equalizing cover 39, air can apply acting force to the valve plug 31 to jack the valve plug 31 open, and it is ensured that air can only enter the drying cylinder 2 in one direction and cannot flow back to the secondary rodless cavity 22 from the drying cylinder 2.

As shown in fig. 3, the piston rod 17 is hinged on a connecting rod 34, the other end of the connecting rod 34 is hinged on an eccentric shaft 33, the eccentric shaft 33 is fixed on the rotating shaft of the motor 3, and the axis of the eccentric shaft 33 and the axis of the rotating shaft of the motor 3 are arranged eccentrically. When the rotating shaft of the motor 3 rotates, the eccentric shaft 33 rotates, and drives the connecting rod 34 to reciprocate, thereby driving the piston rod 17 to reciprocate.

The structure of the drying tank 2 is as follows: as shown in fig. 5, the drying tank 2 includes a tank 35, an upper baffle 36 and a lower baffle 37 are disposed in an inner cavity of the tank 35, the upper baffle 36 and the lower baffle 37 divide the inner cavity of the tank 35 into a first cavity 43, a drying cavity 44 and a second cavity 45 which are sequentially arranged up and down, the first cavity 43 is communicated with the secondary air outlet 30, the second cavity 45 is communicated with the air outlet 11, and a first spring 38 connected to the upper baffle 36 is mounted in the first cavity 43. The lower baffle 37 is fixed relative to the tank 35, the upper baffle 36 slides in the tank 35 in a reciprocating manner, a plurality of through holes are formed in the upper baffle 36 and the lower baffle 37, and drying agents are filled in the drying cavity 44. When the desiccant absorbs water and expands, the volume between the upper baffle 36 and the lower baffle 37 is increased, and the change space requirement of the desiccant can be met.

As shown in fig. 3, in order to uniformly distribute air entering the drying tank 2, a pressure equalizing cover 39 is installed in the first cavity 43, an air distributing cavity 27 is enclosed between the pressure equalizing cover 39 and the upper baffle 36, an air passing hole is formed in the pressure equalizing cover 39, one end of the air passing hole is communicated with the secondary air outlet 30, and the other end of the air passing hole is communicated with the air distributing cavity 27.

As shown in fig. 5, the lower portion of the drying cylinder 2 is provided with an air outlet 11, and the air outlet 11 passes through the lower connecting plate 13 and leads to an external air spring. In order to deflate the air spring, an exhaust branch 42 is further provided on the sidewall of the air outlet 11, and an electromagnetic on-off valve 41 is provided in the exhaust branch 42. In order to protect the residual pressure of the air spring, a residual pressure control valve 40 is arranged in the exhaust branch 42, and the residual pressure control valve 40 is an elastic plug sealed in the exhaust branch 42.

The utility model discloses a working process as follows:

when the air spring needs to be hardened, the electromagnetic switch valve 41 is in a closed state, the motor 3 is started, the eccentric shaft 33 eccentrically connected with the upper part of the motor 3 rotates, and the rotating motion of the eccentric shaft 33 is converted into linear reciprocating motion through the connecting rod 34, so that the piston rod 17 reciprocates to drive the primary piston 16 and the secondary piston 18 to simultaneously reciprocate in the compression cylinder 1. When the piston rod 17 is pushed into the secondary cylinder cavity, the piston rod 17 is pulled out of the primary cylinder cavity, so that the primary rodless cavity 20 is enlarged, the pressure in the primary rodless cavity 20 is sharply reduced, vacuum occurs, the first valve plate 25 is forced to open, and the blocking effect on the primary air inlet hole 24 is lost. Air enters the primary filter tank 4 and the secondary filter tank 5 in sequence through the air inlet 8, then passes through the primary filter tank 4 and the secondary filter tank 5 to filter foreign matters in the air, then enters the primary rod cavity 19 through the connecting cavity 15, passes through the primary air inlet 24, and finally enters the primary rodless cavity 20.

When the primary piston 16 pushes towards the primary cylinder cavity, the first valve plate 25 is closed, the primary rodless cavity 20 becomes small, air in the primary rodless cavity is compressed, when the pressure is increased to a certain degree, the compressed air enters the airflow channel 23 from the primary air outlet 26, at the moment, the secondary rodless cavity 22 is in the process of becoming large, the second valve plate 29 is opened, and the air compressed by the primary rodless cavity 20 enters the secondary rodless cavity 22.

When the piston rod 17 is pushed into the secondary cylinder cavity again, the second valve plate 29 is closed, and the air after secondary compression pushes open the valve plug 31 on the secondary air outlet 30 and is discharged from the secondary air outlet 30 to supply compressed air with higher pressure. The compressed air enters the drying tank 2, moisture in the compressed air is filtered out in the drying cavity 44, and finally the compressed air is filled into the air spring from the air outlet 11. Thus, when the piston rod 17 moves towards the direction of the secondary rodless cavity 22, the primary rodless cavity 20 sucks air, and the secondary rodless cavity 22 compresses; when the piston rod 17 moves towards the direction of the first-stage rodless cavity 20, the first-stage rodless cavity 20 is compressed, and the second-stage rodless cavity 22 sucks air, namely the first-stage rodless cavity 20 and the second-stage rodless cavity 22 alternately suck air and compress air, so that no matter how the piston rod 17 moves, one rodless cavity is always in a real acting state, the working efficiency of the cylinder is improved, and the second-stage rodless cavity 22 compresses the air compressed by the first-stage rodless cavity 20 again, and the air supply pressure is improved.

When the air spring needs to be deflated to increase the flexibility of the air spring, the motor 3 is switched off, the electromagnetic switch valve 41 is switched on, the residual pressure control valve 40 is opened under the action of compressed air, the exhaust branch 42 is switched on, and the air in the air spring is exhausted to the outside through the exhaust branch 42. When the pressure of the air is gradually reduced along with the discharge of the air and is not enough to push the residual pressure control valve 40 open, the residual pressure control valve 40 is returned to a closed state, so that residual air is not discharged any more, and residual pressure protection is realized.

Except adopting two filter tanks of one-level filter tank 4 and second grade filter tank 5 in above-mentioned embodiment, can properly adjust the quantity of filter tank completely according to the filter effect, adopt one filter tank or three above front and back filter tank that meet in order, can realize the filter effect equally, set up a plurality of filter tanks moreover and can have better filter effect. Besides, the primary air outlet hole 26 can be arranged at the end part of the primary rodless cavity 20, the secondary air inlet hole 28 can be arranged at the end part of the secondary rodless cavity 22, then the air flow channel 23 is arranged in the cylinder shell of the compression cylinder 1, and the communication between the primary air outlet hole 26 and the secondary air inlet hole 28 can also be realized.

The first check valve and the second check valve in the above embodiment are both valve plate structures, the third check valve is a valve plug structure, and besides the structure, the check valves with other specific structures can be adopted as long as the check valves can control the one-way flow of air. The number of the first check valves in the above embodiment is two, and may be one or more, and the first-stage rod chamber 19 and the first-stage rodless chamber 20 can also be communicated in one direction.

In the above embodiment, the first spring 38 is used as the first elastic body, the second spring 32 is used as the second elastic body, and certainly, a rubber body may also be used as the first elastic body and the second elastic body, as long as the rubber body can generate elastic deformation under the action of external force and can be reset under the action of its own elastic force when the external force constraint is lost, and no specific requirements are made on the structure of the rubber body.

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 detail may be made 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 essence of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims (10)

1. The utility model provides an air pump with filtration, includes motor, compression cylinder and drying cabinet, and compression cylinder is by motor drive, its characterized in that: still include the filtration jar that connects in order around one or two more, be equipped with filter equipment in the filtration jar, filter equipment will filter the jar and separate air chamber and the filter chamber that distributes around for, the air chamber intercommunication air inlet of foremost, the filter chamber intercommunication compression cylinder of rearmost end, compression cylinder's other end intercommunication drying cabinet, the gas outlet has been seted up to the other end of drying cabinet.

2. An air pump with filtration as set forth in claim 1, wherein: the compression cylinder comprises a cylinder shell, wherein a first-stage cylinder cavity, a connecting cavity and a second-stage cylinder cavity which are sequentially communicated are formed in the cylinder shell, the radial section of the second-stage cylinder cavity is smaller than that of the first-stage cylinder cavity, the connecting cavity is communicated with a filter cavity, a first-stage piston is assembled in the first-stage cylinder cavity, the first-stage cylinder cavity is divided into a first-stage rod cavity and a first-stage rodless cavity by the first-stage piston, a first-stage air inlet hole is formed in the first-stage piston and communicated with the first-stage rod cavity and the first-stage rodless cavity, a first one-way valve capable of switching on and off the first-stage air inlet hole is arranged on the first-stage air inlet hole, and a first-stage air outlet hole is further communicated with the first-stage rodless cavity;

a secondary piston is assembled in the secondary cylinder cavity, the secondary piston divides the secondary cylinder cavity into a secondary rod cavity and a secondary rodless cavity, a secondary air inlet hole is communicated with the secondary rodless cavity, the secondary air inlet hole is communicated with a primary air outlet hole through an air flow channel, a second one-way valve capable of switching on and off the secondary air inlet hole is arranged on the secondary air inlet hole, a secondary air outlet hole is formed in the side wall of the secondary rodless cavity, the secondary air outlet hole is communicated with the drying tank, and a third one-way valve capable of switching on and off the secondary air outlet hole is arranged on the secondary air outlet hole;

a piston rod is connected between the first-stage piston and the second-stage piston, the piston rod is hinged to a connecting rod, the other end of the connecting rod is hinged to an eccentric shaft, and the eccentric shaft is fixed to a rotating shaft of the motor.

3. An air pump with filtration according to claim 2 wherein: the first check valve is a first valve plate capable of opening towards the direction of the primary rodless cavity, and the second check valve is a second valve plate capable of opening towards the direction of the secondary rodless cavity.

4. An air pump with filtration as set forth in claim 3 wherein: the third check valve includes the second elastomer, and second elastomer one end is connected with the pressure-equalizing cover, and the valve plug is connected to the other end, and the valve plug can the shutoff on the second grade venthole.

5. An air pump with filtration as set forth in claim 4 wherein: the first-stage air outlet hole is formed in the first-stage piston, the second-stage air inlet hole is formed in the second-stage piston, and the airflow channel is formed in the piston rod.

6. An air pump with filtration according to any one of claims 1 to 5, wherein: the drying tank comprises a tank body, an upper baffle and a lower baffle are arranged in an inner cavity of the tank body, the upper baffle and the lower baffle separate the inner cavity of the tank body into a first cavity, a drying cavity and a second cavity which are sequentially arranged from top to bottom, the first cavity is communicated with the second-level air outlet, the second cavity is communicated with the air outlet, a first elastic body connected with the upper baffle is installed in the first cavity, a drying agent is filled in the drying cavity, and through holes are formed in the upper baffle and the lower baffle.

7. An air pump with filtration according to claim 6 wherein: the pressure equalizing cover is installed in the first cavity, a gas distribution cavity is formed by the pressure equalizing cover and the upper baffle in a surrounding mode, a gas passing hole is formed in the pressure equalizing cover, one end of the gas passing hole is communicated with the secondary gas outlet, and the other end of the gas passing hole is communicated with the gas distribution cavity.

8. An air pump with filtration according to any one of claims 1 to 5, wherein: the air outlet is communicated with an exhaust branch, and an electromagnetic switch valve and a residual pressure control valve are sequentially arranged in the exhaust branch.

9. An air pump with filtration according to claim 8 wherein: the residual pressure control valve is an elastic plug which is plugged in the exhaust branch.

10. An air pump with filtration according to any one of claims 1 to 5, wherein: and the outer wall of the compression cylinder is provided with radiating fins.

Images