Gas-liquid booster pump

Abstract

The invention relates to a supercharging device, in particular to a gas-liquid booster pump, which is characterized in that the near ends of an oil cylinder barrel and an air cylinder barrel which are concentrically arranged are connected to a connecting seat, the barrel ends of the oil cylinder barrel and the air cylinder barrel which are far away from each other are respectively provided with an oil cylinder cover, an air cylinder cover and an oil tank barrel are sleeved on the periphery of the oil cylinder barrel, and the two ends of the oil tank barrel are respectively connected to the connecting seat and the oil cylinder cover; the connecting seat is provided with a communicating hole for communicating a barrel cavity of the oil cylinder barrel with an annular pipe cavity between the oil tank barrel and the oil cylinder barrel, and an oil cylinder cover of the gas-liquid booster pump, the connecting seat, the barrel wall of the oil cylinder barrel and the barrel wall of the oil tank barrel are matched with one another to directly define a hydraulic oil storage pipe cavity which is arranged adjacent to the oil cylinder barrel and attached to the oil cylinder barrel. The available space on the pump body structure is fully utilized to integrate the oil storage structure, the oil storage structure and the pump body are high in integration degree and small in size, and the pump body is quicker in oil supplementing and pressurizing response.

Description

TECHNICAL FIELD

[0001] The present application relates to a supercharging device, in particular to a gas-liquid supercharging pump. BACKGROUND

[0002] The numerical control machine tool machining center is a numerical control machine tool with extremely high automation, which can combine various processes such as milling and drilling, and realize cutting processing by combining the position adjustment of the workbench and the indexing tool changing. Among them, the hydraulic power system as an important part of the numerical control machine tool plays an extremely important role. For example, in the patent literature with the name of "drilling and milling machining center" (publication number CN111136491B), the indexing of the tool tower needs to be unlocked and locked through the locking mechanism. The locking mechanism as an actuator includes a cylinder body, a piston and a locking tooth disc. By injecting and discharging hydraulic oil or air into the cylinder body, the cylinder body is driven to move axially, driving the locking tooth disc to engage or separate from the limiting tooth disc on the tool tower, and realizing the indexing of the tool tower. In the past technology, the hydraulic pressure is usually provided by a large hydraulic station, and the hydraulic station often sets up multiple pipelines to provide hydraulic power for multiple machine tools, but this corresponds to the defect that the oil pipeline is too long, which makes the actuator slow to respond. Therefore, in the prior art, there is also a scheme that each machine tool is separately provided with an independent gas-liquid supercharging pump to provide hydraulic power. The gas-liquid supercharging pump has the advantages of small size, fast response and automatic pressure compensation.

[0003] The patent literature with the name of "a gas-liquid supercharging pump" (publication number CN109854482B, hereinafter referred to as document 1) discloses a technical scheme including a first cylinder and a second cylinder, the first cylinder is connected with a front cover at one end and connected with a rear cover at the other end, the second cylinder is connected to the front cover, the first cylinder is provided with a first piston cavity, the second cylinder is provided with a second piston cavity, the first piston cavity is provided with a first piston and a piston rod, the second piston cavity is provided with a second piston, the rear cover is provided with a reversing valve, the rear cover is provided with a first connecting channel, the first connecting channel is provided with a first buffer, the front cover and the rear cover are provided with a first air pipe and a second air pipe, the front cover is provided with a second connecting channel, the second connecting channel is provided with a second buffer, the second cylinder is connected with an end cover, the end cover is provided with a liquid inlet, the end cover is further provided with a first check valve, the front cover is provided with a liquid outlet, and the front cover is provided with a second check valve. The scheme uses the reciprocating movement of the second piston in the second cylinder to realize the oil inlet and oil outlet of the pressure oil;

[0004] The technical scheme disclosed in the patent document with the title of "Single-head double-acting gas-liquid booster pump" (publication number CN110594117B, hereinafter referred to as document 2) includes a hydraulic high-pressure part and a gas driving part, wherein the hydraulic high-pressure part includes a flange gland, a front end cover, an oil inlet check valve, a small cylinder, a small piston, a small piston check valve, a method flange, and a transition flange guide end cover; the gas driving part includes a gas driving front end cover, a gas driving rear end cover, a large cylinder, a large piston, a front pilot valve, a rear pilot valve, and a pneumatic spool valve, the large and small pistons are connected through a piston rod fixed at the center part of the piston at both ends, and the pneumatic spool valve is located on the upper part of the gas driving front end cover. The setting of the pneumatic spool valve and the front and rear pilot valves makes the hydraulic oil be output during the bidirectional movement of the piston, solving the problems of low efficiency and high cost of the traditional single-head single-acting gas-liquid booster pump and the double-head double-acting gas-liquid booster pump.

[0005] In the above technical scheme, neither document 1 nor document 2 has a storage structure for supplying oil to the oil cavity on the pump body, and the oil supplement of the gas-liquid booster pump needs to be extracted from a separately arranged oil storage structure (such as an oil tank) through a pipeline or through the oil return of an actuator. Considering the distance between the oil storage structure and the pump body and the pipe length factor of the oil pipe, the speed of the pump oil supplement will be directly affected, so how to reasonably arrange the oil storage structure has a non-negligible influence on the rapid and stable pressure boosting of the pump body. At the same time, because the hydraulic pump and the oil tank are completely separated independent units in space, they occupy a large space and cannot be effectively integrated, which cannot be adapted to the machining center alone. SUMMARY

[0006] The present application provides a gas-liquid booster pump that improves the integration of the oil cylinder and the oil tank connected thereto to reduce the volume and improve the response speed.

[0007] In order to achieve the above-mentioned purpose, the technical scheme adopted is as follows: a gas-liquid booster pump, the adjacent ends of the oil cylinder barrel and the gas cylinder barrel arranged in the same core are connected on the connecting seat, the cylinder ends of the oil cylinder barrel and the gas cylinder barrel away from each other are respectively provided with an oil cylinder cover and a gas cylinder cover, one end of the plunger passing through the through hole in the connecting seat extends into the oil cylinder barrel, the other end of the plunger is located in the gas cylinder barrel, the plunger and the through hole in the connecting seat form a sealed sliding fit, the end of the plunger located in the gas cylinder barrel has a piston, a sealing ring is arranged on the peripheral surface of the piston to separate the cylinder cavity of the gas cylinder barrel into two gas chambers, the peripheral surface of the plunger is arranged in a gap with the cylinder wall of the oil cylinder barrel, the inner diameter of the gas cylinder barrel is larger than the inner diameter of the oil cylinder barrel, a pressure oil discharge hole is arranged on the oil cylinder cover, an oil tank barrel is arranged outside the peripheral surface of the oil cylinder barrel, and both ends of the oil tank barrel are connected to the connecting seat and the oil cylinder cover, respectively, the connecting seat has a communication hole that communicates the cylinder cavity of the oil cylinder barrel and an annular pipe cavity between the oil tank barrel and the oil cylinder barrel, and the output end of the one-way valve arranged in the communication hole communicates with the cylinder cavity of the oil cylinder barrel and the input end communicates with the annular pipe cavity.

[0008] Compared with the prior art, the technical effect of the present application is that the oil tank cylinder is sleeved on the outer periphery of the oil cylinder barrel, the cylinder wall of the oil cylinder cover, the connecting seat and the oil cylinder barrel cooperates with the cylinder wall of the oil tank cylinder, directly encloses the hydraulic oil storage pipe cavity which is arranged adjacent to the oil cylinder barrel and attached to the oil cylinder barrel, and the oil passage hole is arranged on the connecting seat to communicate the storage pipe cavity and the oil cylinder barrel, the arrangement of the oil pipe is cancelled, the available space on the pump body structure is fully utilized to integrate the oil storage structure, the oil storage structure has high integration degree with the pump body and small volume, and the pump body oil supplement and pressure boosting response is more rapid. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 is a schematic diagram of the three-dimensional appearance of the present application;

[0010] Figure 2 is a side view;

[0011] Figure 3 is a top view;

[0012] Figure 4 is a sectional view in the direction of K-K in Figure 3

[0013] Figure 5 is an enlarged view of the M part in Figure 4

[0014] Figure 6 is a sectional view in the direction of L-L in Figure 3

[0015] Figure 7 is a schematic diagram of the working port connection of the electromagnetic valve. DETAILED DESCRIPTION

[0016] The present application will be further described in detail below in combination with the accompanying drawings and related contents: Figures 1-7

[0017] ​​​​The gas-liquid booster pump is characterized in that: the oil cylinder barrel 10 and the gas cylinder barrel 20 are arranged in a same core and connected to the connecting base 30 at adjacent ends; the cylinder ends of the oil cylinder barrel 10 and the gas cylinder barrel 20 away from each other are respectively provided with the oil cylinder cover 40 and the gas cylinder cover 50; one end of the plunger 21 passing through the through hole in the connecting base 30 extends into the oil cylinder barrel 10, and the other end of the plunger 21 extends into the gas cylinder barrel 20; the plunger 21 and the through hole in the connecting base 30 are in a sealed sliding fit; the end of the plunger 21 in the gas cylinder barrel 20 is provided with the piston 22; the piston 22 is provided with the sealing ring on the peripheral surface, so that the cylinder cavity of the gas cylinder barrel 20 is divided into two gas chambers; the plunger 21 and the cylinder wall of the oil cylinder barrel 10 are arranged in a gap; the inner diameter of the gas cylinder barrel 20 is greater than the inner diameter of the oil cylinder barrel 10; the oil cylinder cover 40 is provided with the pressure oil discharge hole 41; the oil tank barrel 60 is arranged on the outer periphery of the oil cylinder barrel 10, and the two ends of the oil tank barrel 60 are respectively connected to the connecting base 30 and the oil cylinder cover 40; the connecting base 30 is provided with the communication hole 31 which communicates the cylinder cavity of the oil cylinder barrel 10 and the annular pipe cavity C between the oil tank barrel 60 and the oil cylinder barrel 10; the output end of the one-way valve 311 arranged in the communication hole 31 communicates with the cylinder cavity of the oil cylinder barrel 10, and the input end of the one-way valve 311 communicates with the annular pipe cavity C.

[0018] In the above technical solution, the oil tank barrel 60 is arranged on the outer periphery of the oil cylinder barrel 10; the oil cylinder cover 40, the connecting base 30, the cylinder wall of the oil cylinder barrel 10 and the cylinder wall of the oil tank barrel 60 are matched with each other, so as to directly enclose the hydraulic oil storage pipe cavity (i.e. the annular pipe cavity C) which is arranged close to the oil cylinder barrel 10 and attached to the oil cylinder barrel 10; the oil channel (i.e. the communication hole 31) which communicates the storage pipe cavity and the cylinder cavity of the oil cylinder barrel 10 is arranged on the connecting base 30; the arrangement of the oil pipe is cancelled; the available space on the pump body structure is fully utilized to integrate the storage structure; the storage structure is highly integrated with the pump body and has a small volume; the pump body has a faster response to oil supplement and pressure boost; and the pump body is convenient to separately adapt to the machining center.

[0019] Herein, Figure 4For example, the oil inlet and outlet of the oil cylinder 10 is described as follows: a certain amount of normal pressure oil is injected into the annular cavity C between the oil tank 60 and the oil cylinder 10 in advance, when the piston 22 in the cylinder 20 moves upward, the plunger 21 gradually enters the cavity of the oil cylinder 10 to press the oil in the oil cylinder 10 to form pressure oil. The pressure oil can be output to the actuator through the pressure oil outlet hole 41 in the oil cylinder cover 40 to drive the actuator to work. Here, a one-way valve can be arranged in the pressure oil outlet hole 41 and the output end of the one-way valve is communicated with the actuator to prevent the oil delivered to the actuator from flowing back to the oil cylinder 10 through the pressure oil outlet hole 41. Further, when the actuator needs to be pressurized again, the piston 22 moves downward and the plunger 21 moves from the oil cylinder 10 to the cylinder 20, the oil cavity space in the oil cylinder 10 is expanded, a negative pressure is formed in the oil cylinder 10, and the oil stored in the annular cavity C can be sucked into the oil cylinder 10 through the communication hole 31 to realize oil supplementing of the oil cylinder 10. When the plunger 21 moves upward again, the pressure can be increased again. A one-way valve 311 is arranged in the communication hole 31 to prevent the oil in the oil cylinder 10 from flowing back to the annular cavity C during the pressure increasing process of the plunger 21.

[0020] Here, since the air inlet mechanism of the traditional gas-liquid pressure cylinder has been clearly described in the prior art, it belongs to the prior art, and a brief introduction of the air inlet mechanism is given. The air inlet mechanism mainly includes a pneumatic slide valve and a reversing valve (or a pilot valve). For example, the reversing valve is arranged on the opposite side of the connecting seat 30 and the cylinder cover 50, and the pneumatic slide valve is used to control the air inlet of the upper cavity or the lower cavity of the piston 22. For example, when the pneumatic slide valve introduces air into the lower cavity of the piston 22, the piston 22 moves upward, and at the same time, the upper cavity of the piston 22 discharges air. When the piston 22 moves upward to press the reversing valve on the connecting seat 30, the air inlet channel of the pneumatic slide valve changes, the upper cavity of the piston 22 starts to introduce air, and the lower cavity of the piston 22 starts to discharge air, which drives the piston 22 to move downward. Conversely, when the piston 22 presses the reversing valve on the cylinder cover 50, the lower cavity of the piston 22 introduces air again and the upper cavity discharges air, which drives the piston 22 and the plunger 21 to move reciprocally. In addition, the air inlet and outlet of the upper and lower cavities of the piston 22 can also be controlled by an electric control mode, and the stroke of the piston 22 and the oil pressure detection can be determined.

[0021] As a preferred scheme, in order to more conveniently supplement oil into the oil cylinder 10, the output end of the communication hole 31 is communicated to the gap between the plunger 21 and the cylinder port of the oil cylinder 10, which forms an oil inlet channel of the oil cylinder 10. On the one hand, it is not necessary to process an oil inlet hole on the cylinder body of the oil cylinder 10, which ensures the structural strength of the cylinder body of the oil cylinder 10, and on the other hand, it is also unnecessary to arrange a pipeline, and the structure is simpler.

[0022] Further, as shown in FIG. 4, the output end of the communication hole 31 is communicated to the gap between the plunger 21 and the cylinder port of the oil cylinder 10, which forms an oil inlet channel of the oil cylinder 10. On the one hand, it is not necessary to process an oil inlet hole on the cylinder body of the oil cylinder 10, which ensures the structural strength of the cylinder body of the oil cylinder 10, and on the other hand, it is also unnecessary to arrange a pipeline, and the structure is simpler. Figure 4As shown, considering the oil in the annular cavity C is constantly reduced, it is necessary to add oil into it, and in the present application, a refilling tank 70 is also included, the oil outlet hole 71 at the bottom of the refilling tank 70 is communicated with the annular cavity C, by opening the tank cover of the refilling tank 70 and adding oil into it, the oil added into the refilling tank 70 enters the annular cavity C through the oil outlet hole 71 at the bottom, thereby facilitating the refilling of the annular cavity C. Among them, the top of the refilling tank 70 is provided with a gas hole, in order to avoid the negative pressure generated when the oil in the tank is reduced, which makes it difficult for the subsequent oil to be discharged.

[0023] As a preferred solution, the oil cylinder barrel 10 and the air cylinder barrel 20 are distributed vertically and stand upright as a whole, the refilling tank 70 is connected to the connecting seat 30, the connecting seat 30 has an oil passage hole 32 communicated with the annular cavity C, and the oil outlet hole 71 of the refilling tank 70 is communicated with the end of the oil passage hole 32 away from the annular cavity C. In this solution, the refilling tank 70 is connected to the connecting seat 30, and the refilling tank 70 and the annular cavity C are directly communicated through the oil passage hole 32 on the connecting seat 30, which reduces the arrangement of the pipeline, further improves the integration of the pump body, reduces the overall volume of the pump body, and improves the refilling rate.

[0024] In combination Figure 6 With Figure 7 As shown, the present application also includes a solenoid valve 80 for controlling the flow of oil between the pump body and the actuator. Among them, the solenoid valve 80 is connected to the oil cylinder cover 40, the solenoid valve 80 is respectively provided with a first working port A, a second working port B, an oil inlet port P and a return oil port T, the oil inlet port P is communicated with the output end of the pressure oil discharge hole 41, the first working port A and the second working port B are connected to the actuator, the return oil port T is communicated with the annular cavity C through the return oil hole 42 on the oil cylinder cover 40, and the lower end of the return oil hole 42 is connected with a through pipe O, and the lower end of the through pipe O extends downward to a position close to the connecting seat 30. In this solution, the solenoid valve 80 is directly integrated on the oil cylinder cover 40, and the solenoid valve 80 and the oil cylinder cover 40 do not need to be communicated through a long pipeline, thereby shortening the flow path of the oil to a certain extent, which helps to improve the response rate of the pump body refilling and pressurization. In addition, the lower end of the return oil hole 42 is provided with a through pipe O, which can better guide the backflow of the oil to the bottom of the annular cavity C, and inhibit the phenomenon of the oil discharged from the return oil hole 42 from impacting and foaming in the annular cavity C, on the one hand, in order to ensure the stability of the oil supply in the oil cylinder barrel 10, and on the other hand, in order to avoid the oil in the annular cavity C from forming a foam layer and being discharged through the air hole 43 on the oil cylinder cover 40.

[0025] The electromagnetic valve 80 in the present application is a two-position four-way valve, and the structure of the valve body itself belongs to the prior art and will not be described in detail here. In order to more clearly understand the oil flow between the pump body and the actuator, the basic control idea of the electromagnetic valve 80 is described: the pressure oil discharged from the pressure oil discharge hole 41 enters the oil inlet P of the electromagnetic valve 80, and the electromagnetic valve 80 controls the pressure oil to be delivered to the actuator through the first working port A or the second working port B. When the first working port A sends oil to the actuator, the actuator will also return oil to the pump body through the second working port B (the oil inlet and outlet actions of the actuator can refer to the oil inlet and outlet actions of the traditional oil cylinder during operation). Conversely, when the second working port B sends oil to the actuator, the first working port A returns oil at the same time. Among them, whether it is the first working port A or the second working port B, the oil returned by the actuator will be discharged from the oil return port T on the electromagnetic valve 80, and further discharged into the annular cavity C through the oil return hole 42 on the cylinder cover 40 and the through pipe O, for subsequent use of the pump body to increase pressure, so as to form a circulating path of oil between the actuator and the pump body through the electromagnetic valve 80.

[0026] Further, in order to avoid the situation that the oil in the annular cavity C enters the oil cylinder barrel 10 and causes negative pressure in the annular cavity C, which leads to difficulty in oil inlet of the oil cylinder barrel 10, the annular cavity C is connected with the atmosphere, so that the annular cavity C is always a constant pressure cavity.

[0027] As a preferred solution, the oil cylinder barrel 10 and the air cylinder barrel 20 are distributed vertically and stand upright as a whole, and the air vent hole 43 for connecting the annular cavity C with the atmosphere is formed in the cylinder cover 40. In this solution, the pump body stands upright as a whole, and the air vent hole 43 in the cylinder cover 40 can keep the annular cavity C at constant pressure.

[0028] Further, in order to avoid the situation that the oil in the annular cavity C enters the oil cylinder barrel 10 and causes negative pressure in the annular cavity C, which leads to difficulty in oil inlet of the oil cylinder barrel 10, the annular cavity C is connected with the atmosphere, so that the annular cavity C is always a constant pressure cavity.

[0029] Combining Figure 4 and Figure 5 It is shown that the communication hole 31 is connected and communicated by the first branch hole 312 and the second branch hole 313 on the connecting seat 30, one end of the first branch hole 312 is communicated with the annular cavity C, the other end of the second branch hole 313 away from the first branch hole 312 is communicated with the gap between the peripheral surface of the plunger 21 and the inner wall of the oil cylinder barrel 10, the adjacent ends of the first branch hole 312 and the second branch hole 313 are formed on one side of the connecting seat 30 and are in an open state, the end cover 33 is covered on the adjacent hole ends of the first branch hole 312 and the second branch hole 313, and the first branch hole 312 and the second branch hole 313 are communicated by the cover cavity of the end cover 33, and the one-way valve 311 is built in the first branch hole 312 or the second branch hole 313 in an open state.

[0030] In the present scheme, in order to facilitate the disassembly and maintenance of the one-way valve 311, the communication hole 31 is composed of two parts, the first branch hole 312 and the second branch hole 313, and one end of the two hole channels is open on the connecting seat 30. When the one-way valve 311 needs to be disassembled, the end cover 33 can be removed, and the one-way valve 311 can be installed or removed through the open end of the first branch hole 312 or the second branch hole 313 on the side of the connecting seat 30. After the end cover 33 is closed, the first branch hole 312 and the second branch hole 313 are communicated by the cover cavity of the end cover 33, and the normal flow of oil is not affected.

[0031] As shown in Figure 1 With Figure 4 In the present application, the diameter of the oil tank cylinder 60 is consistent with the diameter of the cylinder barrel 20. The diameter of the oil tank cylinder 60 does not exceed the diameter of the original large-diameter cylinder barrel 20, and the available idle space on the outer periphery of the oil cylinder barrel 10 is fully utilized to form an oil storage structure for oil, which has high overall integration and small volume.

Claims

1. A gas-liquid booster pump, the adjacent ends of the oil cylinder barrel (10) and the gas cylinder barrel (20) are connected on the connecting seat (30) in a same-core arrangement, the cylinder ends of the oil cylinder barrel (10) and the gas cylinder barrel (20) away from each other are respectively provided with an oil cylinder cover (40) and a gas cylinder cover (50), one end of the plunger (21) passing through the through hole in the connecting seat (30) extends into the oil cylinder barrel (10), and the other end of the plunger (21) is located in the gas cylinder barrel (20), the plunger (21) and the through hole in the connecting seat (30) form a sealed sliding fit, the end of the plunger (21) located in the gas cylinder barrel (20) is provided with a piston (22), a sealing ring is arranged on the circumferential surface of the piston (22) to separate the barrel cavity of the gas cylinder barrel (20) into two gas chambers, the circumferential surface of the plunger (21) is arranged in a gap with the barrel wall of the oil cylinder barrel (10), and the inner diameter of the gas cylinder barrel (20) is greater than the inner diameter of the oil cylinder barrel (10), characterized in that: The oil cylinder cover (40) is provided with a pressure oil discharge hole (41), the oil tank cylinder (60) is sleeved on the outer periphery of the oil cylinder cylinder (10), and the two ends of the oil tank cylinder (60) are connected to the connecting seat (30) and the oil cylinder cover (40) respectively, the connecting seat (30) has a communication hole (31) for communicating the cylinder cavity of the oil cylinder cylinder (10) and the annular pipe cavity (C) between the oil tank cylinder (60) and the oil cylinder cylinder (10), and the output end of a one-way valve (311) arranged in the communication hole (31) is communicated with the cylinder cavity of the oil cylinder cylinder (10) and the input end is communicated with the annular pipe cavity (C).

2. The gas-liquid boost pump according to claim 1, characterized by: The output end of the communication hole (31) is communicated to the gap between the peripheral surface of the plunger (21) and the cylinder port of the oil cylinder cylinder (10).

3. The gas-liquid boost pump according to claim 1 or 2, characterized by: The oil cylinder cover (40) is provided with a pressure oil discharge hole (41), the oil tank cylinder (60) is sleeved on the outer periphery of the oil cylinder cylinder (10), and the two ends of the oil tank cylinder (60) are connected to the connecting seat (30) and the oil cylinder cover (40) respectively, the connecting seat (30) has a communication hole (31) for communicating the cylinder cavity of the oil cylinder cylinder (10) and the annular pipe cavity (C) between the oil tank cylinder (60) and the oil cylinder cylinder (10), and the output end of a one-way valve (311) arranged in the communication hole (31) is communicated with the cylinder cavity of the oil cylinder cylinder (10) and the input end is communicated with the annular pipe cavity (C).

4. The gas-liquid boost pump according to claim 3, characterized by: The oil cylinder cover (40) is provided with a pressure oil discharge hole (41), the oil tank cylinder (60) is sleeved on the outer periphery of the oil cylinder cylinder (10), and the two ends of the oil tank cylinder (60) are connected to the connecting seat (30) and the oil cylinder cover (40) respectively, the connecting seat (30) has a communication hole (31) for communicating the cylinder cavity of the oil cylinder cylinder (10) and the annular pipe cavity (C) between the oil tank cylinder (60) and the oil cylinder cylinder (10), and the output end of a one-way valve (311) arranged in the communication hole (31) is communicated with the cylinder cavity of the oil cylinder cylinder (10) and the input end is communicated with the annular pipe cavity (C).

5. The gas-liquid boost pump of claim 1, wherein: The annular pipe cavity (C) is communicated with the atmosphere.

6. The gas-liquid boost pump of claim 1, wherein: The oil cylinder cylinder (10) and the air cylinder cylinder (20) are arranged in an up-down distribution and are vertically erected, the oil cylinder cover (40) is provided with a vent hole (43) for communicating the annular pipe cavity (C) with the atmosphere.

7. The gas-liquid boost pump of claim 6, wherein: The vent hole (43) is provided with a breathing membrane (431).

8. The gas-liquid boost pump of claim 7, wherein: The communication hole (31) is communicated by a first branch hole (312) and a second branch hole (313) on the connecting seat (30), one end of the first branch hole (312) is communicated with the annular pipe cavity (C), one end of the second branch hole (313) away from the first branch hole (312) is communicated with the gap between the peripheral surface of the plunger (21) and the inner wall of the oil cylinder cylinder (10), the adjacent ends of the first branch hole (312) and the second branch hole (313) are provided on one side of the connecting seat (30) and are in an open state, an end cover (33) is covered on the adjacent hole ends of the first branch hole (312) and the second branch hole (313), the first branch hole (312) and the second branch hole (313) are communicated by the cover cavity of the end cover (33), and the one-way valve (311) is arranged in the first branch hole (312) or the second branch hole (313) in an open state.

9. The gas-liquid boost pump of claim 2, wherein: ​ 10. The gas-liquid boost pump of claim 1, wherein: The cylinder diameter of the oil tank cylinder (60) is identical to the cylinder diameter of the cylinder (20).

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