CN218971390U - Pneumatic oil pump can dismantle built-in structure of taking a breath - Google Patents

Abstract

The utility model provides a detachable built-in ventilation structure of a pneumatic oil pump, which relates to the technical field of oil pumps and aims to solve the problems that a ventilation air passage of the pneumatic oil pump and a pump body are integrally installed and cannot be detached singly and are difficult to detach when a ventilation device is maintained in the prior art. The pneumatic oil pump is convenient to detach and simple and quick to maintain when the ventilation loop is maintained.

Description

Pneumatic oil pump can dismantle built-in structure of taking a breath

Technical Field

The utility model relates to the technical field of oil pumps, in particular to a detachable built-in ventilation structure of a pneumatic oil pump.

Background

The pneumatic pump adopts compressed air as a power source, and the volume pump with volume change caused by the reciprocating deformation of the diaphragm can pump and absorb various corrosive liquids, liquid with particles, high-viscosity, volatile, inflammable and extremely toxic liquids.

As shown in fig. 1, a piston is disposed in a pump body 11, the piston separates an inner cavity of the pump body to form an upper air cavity 171 and a lower air cavity 172, an upper cavity air channel 18 is disposed outside the pump body 11, the upper cavity air channel 18 is connected to enable the upper air cavity 171 to be communicated with an air inlet joint 112 disposed on the pump body, the air inlet joint 112 is communicated with the lower air cavity 172 through a lower cavity air channel 19 disposed in the pump body, a sealing cover 24 is stirred between the upper cavity air channel 18 and the lower cavity air channel 19 through a stirring block 23 disposed inside the pump body to perform air channel conversion, and air is discharged through an exhaust hole 313. The pneumatic oil pump has the advantages that the ventilation air channel and the pump body are integrated, the pneumatic oil pump cannot be independently disassembled, and when the ventilation device is maintained, the pneumatic oil pump is difficult to disassemble and complicated to install; in addition, the upper cavity gas circuit pipeline is arranged outside the pump body and is easy to damage due to collision, the appearance of the product is affected, and the structure is complex.

Disclosure of Invention

The utility model aims to provide a detachable built-in ventilation structure of a pneumatic oil pump, which solves the problems that a ventilation air passage of the pneumatic oil pump and a pump body are integrally installed and cannot be detached independently and is difficult to detach when a ventilation device is maintained in the prior art.

The utility model provides a detachable built-in ventilation structure of a pneumatic oil pump, which comprises an oil pump body and a sliding block ventilation mechanism, wherein an air cavity is arranged in the oil pump body, a piston capable of sliding up and down in the air cavity is arranged in the air cavity, the piston divides the air cavity into an upper air cavity and a lower air cavity, one side of the oil pump body is provided with a containing cavity matched with the sliding block ventilation mechanism, the oil pump body on the opposite side of the containing cavity is provided with an air inlet communicated with the containing cavity, the sliding block ventilation mechanism is arranged in the containing cavity, and gas entering the oil pump body from the air inlet is selectively introduced into the upper air cavity or the lower air cavity through the sliding block ventilation mechanism.

As a preferable scheme of the utility model, an upper air passage channel communicated with the upper air cavity and a lower air passage channel communicated with the lower air cavity are arranged in the oil pump body at the lower side of the air cavity, the sliding block air exchanging mechanism comprises an air exchanging seat and a sliding cover plate, an upper air exchanging channel and a lower air exchanging channel are arranged in the air exchanging seat, the upper air exchanging channel is connected with the upper air passage channel, the lower air exchanging channel is connected with the lower air passage channel, the sliding cover plate is arranged at one side, close to the air inlet, of the air exchanging seat and is arranged at inlets of the upper air exchanging channel and the lower air exchanging channel in a sliding manner, and the sliding cover plate can be selectively blocked on the inlet of the upper air exchanging channel or the inlet of the lower air exchanging channel.

As a preferable mode of the present utility model, an exhaust hole is provided between the inlet of the upper ventilation channel and the inlet of the lower ventilation channel, the exhaust hole is provided penetrating through the left and right sides of the ventilation seat, the exhaust hole is communicated with the upper ventilation channel when the sliding cover plate is sealed on the exhaust hole and the inlet of the upper ventilation channel, and the exhaust hole is communicated with the lower ventilation channel when the sliding cover plate is sealed on the exhaust hole and the lower ventilation channel.

As a preferable scheme of the utility model, a vertically arranged connecting rod is arranged in the oil pump body, the top end of the connecting rod is connected with the piston, a stirring block is connected to the connecting rod, the stirring block is correspondingly arranged at the inner side of the air inlet, a stirring groove is formed in one side, facing the sliding block air exchanging mechanism, of the stirring block, and the sliding cover plate is limited in the stirring groove.

As a preferable scheme of the utility model, the sliding block ventilation mechanism further comprises a sliding block limiting plate and a sliding block pressing plate, wherein the sliding block limiting plate and the sliding block pressing plate are sequentially arranged on one side, close to the air inlet, of the ventilation seat, a limiting groove is formed in the middle of the sliding block limiting plate, an inlet of the upper ventilation channel, an inlet of the lower ventilation channel and the exhaust hole are correspondingly formed in the inner side of the limiting groove, the sliding block pressing plate is arranged across the limiting groove, two ends of the sliding block pressing plate are arranged on the sliding block limiting plate through fixing pieces, and the sliding cover plate protrudes out of the sliding block limiting plate towards one side of the air inlet and is limited in the limiting groove in the inner side of the sliding block pressing plate.

As a preferred aspect of the present utility model, the sliding ventilation mechanism further includes a sliding sealing sheet, the sliding sealing sheet is disposed between the ventilation seat and the sliding pressing plate, through holes corresponding to the inlet of the upper ventilation channel, the inlet of the lower ventilation channel and the exhaust hole are formed in the sliding sealing sheet, the sliding cover sheet includes a side plate and a top plate, the side plate is vertically disposed around a peripheral side of the top plate, and when the side plate abuts against the sliding sealing sheet, the top plate and the sliding sealing sheet are disposed in a gap.

As a preferable mode of the utility model, a silencing sheet is arranged on one side of the ventilation seat, which is away from the sliding cover plate, the silencing sheet covers the outlet of the exhaust hole, and the periphery of the silencing sheet is arranged on the ventilation seat through an elastic check ring.

As a preferable scheme of the utility model, the top surface of the ventilation seat is an inclined surface inclined from outside to inside, a ventilation hole sealing ring is arranged between the top surface of the ventilation seat and the oil pump body, and the ventilation hole sealing ring is respectively arranged around the outlet of the upper ventilation channel and the outlet of the lower ventilation channel.

As a preferable scheme of the utility model, the oil pump body comprises an air cylinder inner sleeve, an air cylinder outer sleeve and a pump body, wherein the air cylinder inner sleeve and the air cylinder outer sleeve are arranged at the top end of the pump body, the sliding block ventilation mechanism is arranged on the pump body, the air cavity is formed in the air cylinder inner sleeve, the air cylinder outer sleeve is sleeved on the outer side of the air cylinder inner sleeve, an upper air passage leading to the upper air cavity is formed between the air cylinder outer sleeve and the air cylinder inner sleeve, and the upper air passage is connected with the upper air passage.

Compared with the prior art, the utility model has the following positive effects:

1. the utility model provides a detachable built-in ventilation structure of a pneumatic oil pump, which comprises an oil pump body and a sliding block ventilation mechanism, wherein an air cavity is arranged in the oil pump body, a piston capable of sliding up and down in the air cavity is arranged in the air cavity, the piston divides the air cavity into an upper air cavity and a lower air cavity, one side of the oil pump body is provided with a containing cavity matched with the sliding block ventilation mechanism, the oil pump body on the opposite side of the containing cavity is provided with an air inlet communicated with the containing cavity, the sliding block ventilation mechanism is arranged in the containing cavity, and gas entering the oil pump body from the air inlet is selectively introduced into the upper air cavity or the lower air cavity through the sliding block ventilation mechanism. According to the pneumatic oil pump, the sliding block ventilation mechanism is arranged, so that gas introduced into the oil pump body from the air inlet can be selectively introduced into the upper air cavity or the lower air cavity, the sliding block ventilation mechanism is detachably arranged in the accommodating cavity of the oil pump body, and is designed to be in an independent detachable mode, so that the air channel inside the sliding block ventilation mechanism is convenient to detach after the sliding block ventilation mechanism is convenient to detach when a ventilation loop is maintained, the sliding block ventilation mechanism is simple and quick to maintain, the processing difficulty of the oil pump body is effectively reduced, and the assembly is simpler.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a pneumatic oil pump of the prior art;

FIG. 2 is a schematic structural view of the pneumatic oil pump of the present utility model;

FIG. 3 is an external schematic view of the pneumatic oil pump of the present utility model;

fig. 4 is a schematic structural view of an oil pump body according to the present utility model;

FIG. 5 is an external schematic view of an oil pump body according to the present utility model;

FIG. 6 is a schematic diagram of a slider air exchange mechanism according to the present utility model;

FIG. 7 is a right side view of the slider air exchange mechanism of the present utility model;

fig. 8 is a left side view of the slider air exchange mechanism of the present utility model.

In the figure: 1. an oil pump body; 11. a pump body; 111. an air inlet; 112. an air inlet joint; 113. a receiving chamber; 12. an inner cylinder sleeve; 13. a cylinder jacket; 14. an upper air path; 15. a lower gas path channel; 16. an upper gas path channel; 171. an upper air cavity; 172. a lower air cavity; 18. an upper cavity gas path pipeline; 21. a piston; 22. a connecting rod; 23. a poking block; 231. a toggle groove; 24. sealing cover; 3. a slider ventilation mechanism; 31. a ventilation seat; 311. an upper ventilation channel; 312. a lower ventilation channel; 313. an exhaust hole; 32. a slider sealing sheet; 33. a slide block limiting plate; 331. a limit groove; 34. sliding the cover plate; 341. a side plate; 342. a top plate; 35. a slide block pressing plate; 36. a sound damping sheet; 37. a circlip; 38. an air vent sealing ring; 39. and a fixing piece.

Detailed Description

In the description of the present utility model, it is to be noted that, unless otherwise indicated, the meaning of "plurality" means two or more; the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "front," "rear," "head," "tail," and the like are merely for convenience in describing and simplifying the utility model based on the orientation or positional relationship shown in the drawings and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model can be understood as appropriate by those of ordinary skill in the art.

The following describes the embodiments of the present utility model in further detail with reference to the drawings.

Example 1:

the embodiment provides a detachable built-in ventilation structure of a pneumatic oil pump, which is shown in fig. 2-8, and comprises an oil pump body 1 and a sliding block ventilation mechanism 3. An air chamber is provided in the oil pump body 1, a piston 21 is provided in the air chamber so as to be capable of sliding up and down in the inside thereof, and the piston 21 divides the air chamber into an upper air chamber 171 and a lower air chamber 172. One side of the oil pump body 1 is provided with a containing cavity 113 matched with the sliding block ventilation mechanism 3, the oil pump body 1 at the opposite side of the containing cavity 113 is provided with an air inlet 111 communicated with the containing cavity 113, and the sliding block ventilation mechanism 3 is arranged in the containing cavity 113. The gas introduced into the oil pump body 1 from the gas inlet 111 is selectively introduced into the upper air chamber 171 or the lower air chamber 172 through the slider air exchanging mechanism 3.

The pneumatic oil pump in this embodiment is through setting up slider breather 3, slider breather 3 makes and lets in the gas in the oil pump body 1 from air inlet 111 and can selectively let in last air cavity 171 or lower air cavity 172, slider breather 3 demountable installation is in the holding chamber 113 of oil pump body 1, design slider breather 3 as independent detachable form, when the maintenance is taken a breath the return circuit, conveniently dismantle its inside gas circuit after the maintenance, make slider breather 3 be convenient for dismantle, the maintenance is simple, swiftly, and effectively reduce the processing degree of difficulty of oil pump body, make the assembly simpler.

Preferably, an upper air path passage 16 communicating with the upper air chamber 171 and a lower air path passage 15 communicating with the lower air chamber 172 are provided in the oil pump body 1 at the lower side of the air chamber. The slider air exchanging mechanism 3 includes an air exchanging seat 31 and a sliding cover 34. An upper ventilation channel 311 and a lower ventilation channel 312 are arranged in the ventilation seat 31, the upper ventilation channel 311 is connected with the upper air channel 16, and the lower ventilation channel 312 is connected with the lower air channel 15. The sliding cover 34 is disposed on one side of the ventilation seat 31 near the air inlet 111 and is slidably disposed at the inlets of the upper ventilation channel 311 and the lower ventilation channel 312. And the sliding cover 34 can be selectively blocked on the inlet of the upper ventilation channel 311 or on the inlet of the lower ventilation channel 312. An intake connector 112 is attached to the oil pump body 1, and the intake port 111 is a through hole in the intake connector 112.

When the sliding cover plate 34 in the embodiment is blocked on the inlet of the upper ventilation channel 311, external air enters the lower ventilation channel 312 through the air inlet 111 and enters the lower air cavity 172 through the lower air channel 15; when the sliding cover 34 is blocked on the inlet of the lower ventilation channel 312, the external air enters the upper ventilation channel 311 through the air inlet 111 and enters the upper air chamber 171 through the upper air channel 16.

Preferably, an exhaust hole 313 is provided between the inlet of the upper ventilation channel 311 and the inlet of the lower ventilation channel 312. The exhaust holes 313 are provided through both left and right sides of the ventilation seat 31. When the sliding cover 34 is sealed to the exhaust hole 313 and the inlet of the upper ventilation channel 311, the exhaust hole 313 communicates with the upper ventilation channel 311. When the sliding cover 34 is sealed to the exhaust hole 313 and the lower ventilation channel 312, the exhaust hole 313 communicates with the lower ventilation channel 312.

When the sliding cover 34 in this embodiment is sealed on the exhaust hole 313 and the inlet of the upper ventilation channel 311, the external air enters the lower ventilation channel 312 through the air inlet 111 to supply air to the lower air chamber 172, the piston 21 moves upward in the air chamber, the volume of the upper air chamber 171 decreases, the air in the upper air chamber 171 enters the upper ventilation channel 311 through the upper air passage 16, and the air enters the exhaust hole 313 from the upper ventilation channel 311 and exits the air pump due to the communication between the exhaust hole 313 and the upper ventilation channel 311. When the sliding cover 34 is sealed on the exhaust hole 313 and the lower ventilation channel 312, external air enters the upper ventilation channel 311 through the air inlet 111 to supply air to the upper air chamber 171, the piston 21 moves downward in the air chamber, the volume of the lower air chamber 172 decreases, air in the lower air chamber 172 enters the lower ventilation channel 312 through the lower air passage channel 15, and air enters the exhaust hole 313 from the lower ventilation channel 312 and exits the air pump as the exhaust hole 313 communicates with the lower ventilation channel 312.

Preferably, a vertically arranged connecting rod 22 is arranged in the oil pump body 1, the top end of the connecting rod 22 is connected with the piston 21, a stirring block 23 is connected to the connecting rod 22, the stirring block 23 is correspondingly arranged on the inner side of the air inlet 111, a stirring groove 231 is formed in one side, facing the sliding block ventilation mechanism 3, of the stirring block 23, and the sliding cover plate 34 is limited in the stirring groove 231.

When the piston in this embodiment moves up and down in the air cavity, the connecting rod 22 is driven to move up and down, and the toggle block 23 is driven to move up and down, and the toggle slot 231 drives the sliding cover 34 to move up and down, so that the sliding cover 34 covers the inlet of the upper ventilation channel 311 or the inlet of the lower ventilation channel 312, and the communication state between the air inlet 111 and the upper ventilation channel 311 or the lower ventilation channel 312 is converted.

As shown in fig. 8, the inlet of the lower ventilation passage 312 is disposed at the upper side of the inlet of the upper ventilation passage 311, the exhaust hole 313 is disposed between the inlet of the lower ventilation passage 312 and the inlet of the upper ventilation passage 311, and the inlet of the lower ventilation passage 312, the inlet of the upper ventilation passage 311 and the exhaust hole 313 are disposed in the same vertical direction of the ventilation seat 31.

Preferably, as shown in fig. 6 and 7, the slider air exchanging mechanism 3 further includes a slider limit plate 33 and a slider pressing plate 35. The slide limiting plate 33 and the slide pressing plate 35 are sequentially arranged on one side of the ventilation seat 31 close to the air inlet 111. A limiting groove 331 is provided in the middle of the slider limiting plate 33, and an inlet of the upper ventilation channel 311, an inlet of the lower ventilation channel 312, and the exhaust hole 313 are correspondingly provided inside the limiting groove 331. The slide pressing plate 35 is disposed across the limiting groove 331 and both ends thereof are mounted on the slide limiting plate 33 by the fixing member 39. The sliding cover 34 protrudes from the sliding limiting plate 33 toward one side of the air inlet 111 and is limited in the limiting groove 331 inside the sliding pressing plate 35. The fixing member 39 is a bolt, and the bolt passes through the slide pressing plate 35 and the slide limiting plate 33 to be fixed on the ventilation seat 31.

The sliding cover 34 in the embodiment is driven by the toggle block 23 to move up and down in the limiting groove 331, and is limited by the sliding block pressing plate 35 to be disposed close to the ventilation seat 31, and is sealed on the exhaust hole 313 and the upper ventilation channel 311 or sealed on the exhaust hole 313 and the lower ventilation channel 312.

Preferably, as shown in fig. 6, the slider ventilation mechanism 3 further includes a slider sealing sheet 32, the slider sealing sheet 32 is disposed between the ventilation seat 31 and the slider pressing plate 35, and through holes corresponding to the inlet of the upper ventilation channel 311, the inlet of the lower ventilation channel 312, and the exhaust hole 313 are provided on the slider sealing sheet 32. A sealing ring is arranged between the sliding block sealing piece 32 and the ventilation seat 31, the sealing rings are respectively arranged around the inlet of the upper ventilation channel 311, the inlet of the lower ventilation channel 312 and the periphery of the exhaust hole 313, and the sliding block sealing piece 32 is used for sealing the sliding cover plate 34, so that the periphery of the sliding cover plate 34 can be tightly contacted on the sliding block sealing piece 32.

The slide cover 34 includes a side plate 341 and a top plate 342, the side plate 341 being vertically disposed around the peripheral side of the top plate 342, and the top plate 342 being disposed in a gap with the slider seal 32 when the side plate 341 abuts against the slider seal 32. When the sliding cover 34 covers around the exhaust hole 313 and the inlet of the upper ventilation channel 311, the exhaust hole 313 communicates with the upper ventilation channel 311. When the sliding cover 34 covers around the exhaust hole 313 and the inlet of the lower ventilation channel 312, the exhaust hole 313 communicates with the lower ventilation channel 312.

As shown in fig. 7, the vertical length of the sliding cover plate 34 is greater than that of the sliding block pressing plate 35, so that the toggle groove 231 on the toggle block 23 can drive the sliding cover plate 34 to move up and down on the inner side of the sliding block pressing plate 35.

Preferably, as shown in fig. 3 and 6, a sound damping fin 36 is provided on the side of the ventilation seat 31 facing away from the sliding cover 34. The muffler plate 36 covers the outlet of the exhaust hole 313, and the periphery of the muffler plate 36 is mounted on the ventilation seat 31 through a circlip 37. The muffler sheet 36 is used to eliminate aerodynamic noise.

Preferably, the top surface of the ventilation seat 31 is an inclined surface inclined from outside to inside and downward, and a ventilation hole sealing ring 38 is arranged between the top surface of the ventilation seat 31 and the oil pump body 1, and the ventilation hole sealing ring 38 is respectively arranged around the outlet of the upper ventilation channel 311 and the outlet of the lower ventilation channel 312. The ventilation hole sealing ring 38 makes the ventilation seat 31 and the ventilation seat 31 connected more tightly, so as to avoid air leakage. Corresponding connecting holes are arranged on the air exchanging seat 31 and the pump body 11, and the air exchanging seat 31 and the pump body 11 are connected through the connecting holes arranged at four corners of the air exchanging seat 31 by bolts.

Preferably, the oil pump body 1 includes a cylinder inner sleeve 12, a cylinder outer sleeve 13, and a pump body 11. The cylinder inner sleeve 12 and the cylinder outer sleeve 13 are arranged at the top end of the pump body 11, the sliding block ventilation mechanism 3 is arranged on the pump body 11, an air cavity is formed in the cylinder inner sleeve 12, the cylinder outer sleeve 13 is sleeved outside the cylinder inner sleeve 12, an upper air channel 14 leading to the upper air cavity 171 is formed between the cylinder outer sleeve 13 and the cylinder inner sleeve 12, and the upper air channel 14 is connected with the upper air channel 16.

The upper air passage 14 in the embodiment is arranged between the cylinder outer sleeve 13 and the cylinder inner sleeve 12, so that the air exchanging loops are arranged inside the pump body, and the product structure is more compact and the appearance is attractive on the premise of not affecting the product performance; damage to an external gas circuit caused by collision in the carrying process is effectively avoided; the assembly is simplified, the processing and material cost is reduced, and the practicability is strong.

The working principle of the pneumatic oil pump of this embodiment is described: the air source enters the pump body through the air inlet joint 112, enters the upper air cavity 171 through the upper air passage 14 between the inner cylinder sleeve and the outer cylinder sleeve through the upper air exchange passage 311, the air pressure moves the piston 21 downwards, and meanwhile, the air pressure of the lower air cavity 172 is discharged from the air outlet 313 through the lower air exchange passage 312; the piston 21 moves downwards, the connecting rod 22 drives the poking block 23 to slide downwards, and the sliding cover plate 34 is driven to move downwards; the sliding cover 34 moves downwards, so that the lower ventilation channel 312 is opened, and the upper ventilation channel 311 is closed; the air source enters the lower air chamber 172 through the lower ventilation channel 312, the air pressure moves the piston 21 upwards, and the air pressure of the upper air chamber 171 is discharged from the air discharge hole 313 through the upper ventilation channel 311; the piston 21 moves upwards, the connecting rod 22 drives the toggle block 23 to slide upwards, and the sliding cover plate 34 is driven to move upwards; the sliding cover 34 moves upward to open the upper ventilation channel 311 and close the lower ventilation channel 312. The piston is made to reciprocate by the circulation, so that the oil pump can smoothly pump liquid.

The above description is only of the preferred embodiments of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art can make several variations and modifications without departing from the inventive concept, and it is intended to cover the scope of the present utility model.

Claims (9)

1. The utility model provides a pneumatic oil pump can dismantle built-in structure of taking a breath, its characterized in that includes oil pump body (1) and slider breather (3) set up the air cavity in oil pump body (1), be provided with in the air cavity and can be in its inside piston (21) that slides from top to bottom, piston (21) will the air cavity is separated into upper air cavity (171) and lower air cavity (172) one side of oil pump body (1) be provided with slider breather (3) looks adaptation holding chamber (113) be provided with on oil pump body (1) of holding chamber (113) opposite side with air inlet (111) of holding chamber (113) intercommunication, slider breather (3) set up in holding chamber (113), follow air inlet (111) get into gas in oil pump body (1) is passed through slider breather (3) selectivity lets in upper air cavity (171) or in lower air cavity (172).

2. A pneumatic oil pump detachable built-in ventilation structure according to claim 1, characterized in that an upper air passage (16) communicated with the upper air chamber (171) and a lower air passage (15) communicated with the lower air chamber (172) are arranged in the oil pump body (1) at the lower side of the air chamber, the slider ventilation mechanism (3) comprises a ventilation seat (31) and a sliding cover plate (34), an upper ventilation passage (311) and a lower ventilation passage (312) are arranged in the ventilation seat (31), the upper ventilation passage (311) is connected with the upper air passage (16), the lower ventilation passage (312) is connected with the lower air passage (15), the sliding cover plate (34) is arranged at one side of the ventilation seat (31) close to the air inlet (111) and is slidably arranged at the inlets of the upper ventilation passage (311) and the lower ventilation passage (312), and the sliding cover plate (34) can be selectively blocked on the inlets of the upper ventilation passage (311) or the inlets of the lower ventilation passage (312).

3. A removable internal ventilation structure of a pneumatic oil pump according to claim 2, characterized in that a vent hole (313) is provided between the inlet of the upper ventilation channel (311) and the inlet of the lower ventilation channel (312), the vent hole (313) is provided through the left and right sides of the ventilation seat (31), when the sliding cover plate (34) is sealed on the vent hole (313) and the inlet of the upper ventilation channel (311), the vent hole (313) is communicated with the upper ventilation channel (311), and when the sliding cover plate (34) is sealed on the vent hole (313) and the lower ventilation channel (312), the vent hole (313) is communicated with the lower ventilation channel (312).

4. A pneumatic oil pump detachable built-in ventilation structure according to claim 3, characterized in that a connecting rod (22) arranged vertically is arranged in the oil pump body (1), the top end of the connecting rod (22) is connected with the piston (21), a stirring block (23) is connected on the connecting rod (22), the stirring block (23) is correspondingly arranged on the inner side of the air inlet (111), a stirring groove (231) is formed in one side, facing the sliding block ventilation mechanism (3), of the stirring block (23), and the sliding cover plate (34) is limited in the stirring groove (231).

5. The detachable built-in ventilation structure of a pneumatic oil pump according to claim 4, wherein the sliding block ventilation mechanism (3) further comprises a sliding block limiting plate (33) and a sliding block pressing plate (35), the sliding block limiting plate (33) and the sliding block pressing plate (35) are sequentially arranged on one side, close to the air inlet (111), of the ventilation seat (31), a limiting groove (331) is formed in the middle of the sliding block limiting plate (33), an inlet of the upper ventilation channel (311), an inlet of the lower ventilation channel (312) and the exhaust hole (313) are correspondingly formed in the inner side of the limiting groove (331), the sliding block pressing plate (35) is arranged across the limiting groove (331) and two ends of the sliding block pressing plate (35) are mounted on the sliding block limiting plate (33) through fixing pieces (39), and the sliding cover plate (34) protrudes to one side of the air inlet (111) and is arranged and limited in the limiting groove (331) in the inner side of the sliding block pressing plate (35).

6. The detachable built-in ventilation structure of a pneumatic oil pump according to claim 5, wherein the slider ventilation mechanism (3) further comprises a slider sealing sheet (32), the slider sealing sheet (32) is arranged between the ventilation seat (31) and the slider pressing plate (35), through holes corresponding to the inlet of the upper ventilation channel (311), the inlet of the lower ventilation channel (312) and the exhaust hole (313) are arranged on the slider sealing sheet (32), the sliding cover plate (34) comprises a side plate (341) and a top plate (342), the side plate (341) is vertically arranged around the periphery of the top plate (342), and when the side plate (341) abuts against the slider sealing sheet (32), the top plate (342) is in clearance arrangement with the slider sealing sheet (32).

7. A removable internal ventilation structure for a pneumatic oil pump according to claim 3, characterized in that a silencing sheet (36) is arranged on one side of the ventilation seat (31) away from the sliding cover plate (34), the silencing sheet (36) covers the outlet of the exhaust hole (313), and the periphery of the silencing sheet (36) is mounted on the ventilation seat (31) through a circlip (37).

8. A detachable built-in ventilation structure of a pneumatic oil pump according to claim 2, characterized in that the top surface of the ventilation seat (31) is an inclined surface inclined from outside to inside and downward, a ventilation hole sealing ring (38) is arranged between the top surface of the ventilation seat (31) and the oil pump body (1), and the ventilation hole sealing ring (38) is respectively arranged around the outlet of the upper ventilation channel (311) and the outlet of the lower ventilation channel (312).

9. The detachable built-in ventilation structure of a pneumatic oil pump according to claim 2, wherein the oil pump body (1) comprises a cylinder inner sleeve (12), a cylinder outer sleeve (13) and a pump body (11), the cylinder inner sleeve (12) and the cylinder outer sleeve (13) are arranged at the top end of the pump body (11), the sliding block ventilation mechanism (3) is arranged on the pump body (11), the air cavity is formed in the cylinder inner sleeve (12), the cylinder outer sleeve (13) is sleeved on the outer side of the cylinder inner sleeve (12) and an upper air channel (14) leading to the upper air cavity (171) is formed between the cylinder outer sleeve (13) and the cylinder inner sleeve (12), and the upper air channel (14) is connected with the upper air channel (16).

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