A pneumatic oil pump

Abstract

The present invention proposes a pneumatic oil pump, which relates to the field of oil extraction machinery and equipment. The pneumatic oil pump includes a pump barrel, a pneumatic cylinder, a first fixed valve, a floating valve and a second fixed valve. The pump barrel has a flow guide cavity that runs through from top to bottom. The pneumatic cylinder, the first fixed valve, the floating valve and the second fixed valve are sequentially arranged in the flow guide cavity from top to bottom. The first fixed valve, the floating valve and the second fixed valve are all single-flow valves that only allow liquid to flow upward. The first fixed valve and the second fixed valve are sealed and fixedly connected to the inner wall of the pump barrel, and the floating valve is sealed and slidably matched with the inner wall of the pump barrel. The output end of the pneumatic cylinder passes through the first fixed valve and is connected to the floating valve. The floating valve moves up and down under the drive of the pneumatic cylinder. The pneumatic oil pump proposed by the present invention can realize the suction of liquid in the well without installing a sucker rod, avoiding the operation process of pulling out the sucker rod when inspecting the pump.

Description

Technical Field

[0001] The invention relates to the field of oil production machinery and equipment, in particular to a pneumatic oil pump. Background Art

[0002] An oil well pump refers to an underground device that is driven by a pumping unit to lift the crude oil in the well to the ground. Common oil well pumps include rod oil well pumps and tube oil well pumps.

[0003] Both the tubular oil pump and the rod oil pump need to be matched with an oil pumping unit to realize the up and down movement of the floating valve, and the oil pumping unit occupies a large area.

[0004] Especially in the process of oil field production, conventional sucker rod pumps need to put a sucker rod in the oil pipe to push the floating valve of the sucker pump up and down to achieve the suction of the wellbore fluid. In the process of well repair or pump inspection, it is often necessary to pull out the sucker rod, which is a complicated process, time-consuming, long well repair period and high development cost. In addition, the pump hanging depth of the sucker rod pump must be below the wellbore liquid level to smoothly suck.

[0005] In view of this, the inventor has designed a pneumatic oil pump based on many years of production and design experience in this field and related fields and after repeated experiments, in order to solve the problems existing in the prior art. Summary of the invention

[0006] The object of the present invention is to provide a pneumatic oil pump, which can realize the suction of the liquid in the well without installing the oil pump rod, thereby avoiding the operation process of pulling out the oil pump rod when checking the pump.

[0007] To achieve the above-mentioned purpose, the present invention proposes a pneumatic oil pump, wherein the pneumatic oil pump comprises a pump barrel, a pneumatic cylinder, a first fixed valve, a floating valve and a second fixed valve, the pump barrel has a guide cavity which passes through from top to bottom, the pneumatic cylinder, the first fixed valve, the floating valve and the second fixed valve are sequentially arranged in the guide cavity from top to bottom, the first fixed valve, the floating valve and the second fixed valve are all single-flow valves which only allow liquid to flow upward, the first fixed valve and the second fixed valve are sealed and fixedly connected to the inner wall of the pump barrel, the floating valve is sealed and slidably matched with the inner wall of the pump barrel, the output end of the pneumatic cylinder passes through the first fixed valve and is connected to the floating valve, and the floating valve moves up and down under the drive of the pneumatic cylinder.

[0008] The pneumatic oil pump as described above, wherein the first fixed valve includes a first fixed valve seat and a first valve ball, the outer wall of the first fixed valve seat is fixedly connected to the inner wall of the pump barrel, the first fixed valve seat is provided with a first valve cavity which passes through from top to bottom, the first valve ball is arranged above the first fixed valve seat and can close the first valve cavity, and the output end of the pneumatic cylinder passes through the first fixed valve seat and is sealingly and slidingly matched with the first fixed valve seat.

[0009] The pneumatic oil pump as described above, wherein the traveling valve includes a traveling valve seat and a traveling valve ball, the outer wall of the traveling valve seat is sealingly and slidingly matched with the inner wall of the pump barrel, the traveling valve seat is provided with a traveling valve cavity which passes through the traveling valve seat from top to bottom, the traveling valve ball is arranged above the traveling valve seat and can close the traveling valve cavity, and the output end of the pneumatic cylinder is fixedly connected to the traveling valve seat and can drive the traveling valve seat to move up and down.

[0010] In the pneumatic oil pump as described above, a limiting structure capable of preventing the floating valve ball from falling out is also provided at the top end of the floating valve seat.

[0011] The pneumatic oil pump as described above, wherein the second fixed valve includes a second fixed valve seat and a second valve ball, the outer wall of the second fixed valve seat is fixedly connected to the inner wall of the pump barrel, the second fixed valve seat is provided with a second valve cavity which passes through from top to bottom, and the second valve ball is arranged above the second fixed valve seat and can close the second valve cavity.

[0012] The pneumatic oil pump as described above, wherein the pneumatic cylinder includes a cylinder body, a partition, a first piston, a second piston and an air pipe, the cylinder body is hollow inside and forms a accommodating chamber, the partition is arranged along the vertical direction and divides the accommodating chamber into a first chamber and a second chamber that are not connected to each other, the upper part of the first chamber has an air inlet connected to the air pipe, the lower part of the first chamber has an exhaust hole connected to the atmosphere, the second chamber below the piston is filled with gas, the first piston is arranged horizontally in the first chamber and is in sealing and sliding cooperation with the inner wall of the first chamber, the second piston is arranged horizontally in the second chamber and is in sealing and sliding cooperation with the inner wall of the second chamber, the output end of the pneumatic cylinder includes two connecting rods, the two connecting rods are arranged vertically and parallel, the two connecting rods are fixedly connected to the bottom ends of the first piston and the second piston, respectively, and the bottom ends of the two connecting rods respectively penetrate downwardly into the cylinder body and are in sealing and sliding cooperation with the cylinder body.

[0013] As described above, the pneumatic oil pump, wherein the output end of the pneumatic cylinder also includes a connecting rod body, the top end of the connecting rod body is fixedly connected to the bottom ends of the two connecting rods respectively, and the bottom end of the connecting rod body passes through the first fixed valve and is fixedly connected to the floating valve.

[0014] The pneumatic oil pump as described above, wherein the outer diameter of the cylinder body is smaller than half of the inner diameter of the guide cavity.

[0015] As described above, the pneumatic oil pump, wherein the outer wall of the cylinder body is fixedly connected to the inner wall of the pump barrel.

[0016] Compared with the prior art, the present invention has the following characteristics and advantages:

[0017] The pneumatic oil pump proposed in the present invention can realize the suction of underground crude oil without lowering the sucker rod, which not only ensures the suction effect of the oil pump, but also saves the operation process of pulling out the sucker rod for pump inspection, thereby improving work efficiency; the pneumatic oil pump proposed in the present invention does not need to sink the pump body below the dynamic liquid surface, the installation depth of the pump body is not limited, and the adaptability range is relatively large. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0019] Figure 1 A schematic diagram of the structure of the pneumatic oil well pump proposed by the present invention;

[0020] Figure 2 It is a schematic diagram of the downward movement of the floating valve in the present invention;

[0021] Figure 3 It is a schematic diagram of the upward movement of the floating valve in the present invention;

[0022] Figure 4 It is a structural schematic diagram of the pneumatic cylinder in the present invention;

[0023] Figure 5 It is a schematic diagram of the piston of the pneumatic cylinder in the present invention moving downward;

[0024] Figure 6 It is a schematic diagram of the upward movement of the piston of the pneumatic cylinder in the present invention;

[0025] Figure 7 It is a schematic diagram of the structure of the piston of the pneumatic cylinder in the present invention.

[0026] Description of reference numerals:

[0027] 100. Pneumatic oil pump; 10. Pump barrel;

[0028] 11. diversion cavity; 12. upper joint;

[0029] 13. Pump barrel body; 14. Lower joint;

[0030] 20. Pneumatic cylinder; 21. Cylinder body;

[0031] 22. diaphragm; 23. first piston;

[0032] 24. Second piston; 25. Connecting rod;

[0033] 26. Connecting rod body; 27. Air pipe;

[0034] 28. First cavity; 29. ​​Second cavity;

[0035] 60. Exhaust hole; 30. First fixed valve;

[0036] 31. First fixed valve seat; 32. First valve ball;

[0037] 33. First valve chamber; 40. Traveling valve;

[0038] 41. Floating valve seat; 42. Floating valve ball;

[0039] 43. Floating valve chamber; 44. Limiting structure;

[0040] 50. Second fixed valve; 51. Second fixed valve seat;

[0041] 52. Second valve ball; 53. Second valve chamber. DETAILED DESCRIPTION

[0042] The details of the present invention can be more clearly understood with reference to the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should all be considered to belong to the scope of the present invention.

[0043] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0044] The directional terms "upper", "lower", "top" and "bottom" described in this article are as follows: Figure 1 These directional terms are only relative concepts or referenced to the normal use of the product, and should not be considered as restrictive.

[0045] like Figures 1 to 7 As shown, the present invention proposes a pneumatic oil pump 100, which includes a pump barrel 10, a pneumatic cylinder 20, a first fixed valve 30, a swimming valve 40 and a second fixed valve 50. The pump barrel 10 has a guide cavity 11 that passes through from top to bottom. The pneumatic cylinder 20, the first fixed valve 30, the swimming valve 40 and the second fixed valve 50 are sequentially arranged in the guide cavity 11 from top to bottom. The first fixed valve 30, the swimming valve 40 and the second fixed valve 50 are all single-flow valves that only allow liquid to flow upward. The first fixed valve 30 and the second fixed valve 50 are sealed and fixedly connected to the inner wall of the pump barrel 10, the swimming valve 40 is sealed and slidably matched with the inner wall of the pump barrel 10, the pneumatic cylinder 20 is fixedly connected to the inner wall of the pump barrel 10, and the output end of the pneumatic cylinder 20 vertically passes through the first fixed valve 30 and is connected to the swimming valve 40. The swimming valve 40 moves up and down under the drive of the pneumatic cylinder 20.

[0046] The pneumatic oil pump 100 proposed by the present invention utilizes the pneumatic cylinder 20 to push the traveling valve 40 to move up and down. When the traveling valve 40 moves downward, the first fixed valve 30 and the second fixed valve 50 are in a closed state, and the traveling valve 40 is in an open state. The fluid flows up along the traveling valve cavity 43 to the top of the traveling valve 40; when the traveling valve 40 moves upward, the traveling valve 40 is in a closed state, and the first fixed valve 30 and the second fixed valve 50 are in an open state. The liquid above the traveling valve 40 flows upward under the push of the traveling valve 40 and flows to the wellhead through the first fixed valve 30. When the traveling valve 40 moves upward, the liquid below the pneumatic oil pump 100 flows to the top of the second fixed valve 50 through the second fixed valve 50. In this way, the cyclic motion realizes the function of sucking the fluid in the well. It can be seen from the above working process that the pneumatic oil pump 100 proposed by the present invention can pump the crude oil downhole without lowering the sucker rod, which not only ensures the suction effect of the oil pump, but also saves the operation process of pulling out the sucker rod during ordinary pump inspection, thereby improving work efficiency.

[0047] In an optional embodiment of the present invention, the first fixed valve 30 includes a first fixed valve seat 31 and a first valve ball 32. The outer wall of the first fixed valve seat 31 is sealed and fixedly connected to the inner wall of the pump barrel 10. The first fixed valve seat 31 is provided with a first valve cavity 33 which runs through from top to bottom. The first valve ball 32 is arranged above the first fixed valve seat 31 and can close the first valve cavity 33. The output end of the pneumatic cylinder 20 passes through the first fixed valve seat 31 and is sealingly and slidingly matched with the first fixed valve seat 31.

[0048] In this embodiment, a mounting hole extending from top to bottom is opened on the first valve seat 31. The mounting hole is located on one side of the first valve cavity 33 and is not connected to the first valve cavity 33. The output end of the pneumatic cylinder 20 passes through the above-mentioned mounting hole and is sealed and slidably matched with the inner wall of the mounting hole.

[0049] Furthermore, a certain distance is required between the mounting hole and the first valve cavity 33 to prevent the output end of the pneumatic cylinder 20 from interfering with the movement of the first valve ball 32, thereby ensuring the normal use of the first fixed valve 30. The specific distance length is determined according to the outer diameter of the first valve ball 32, so that the output end of the pneumatic cylinder 20 does not interfere with the normal rise and fall of the first valve ball 32.

[0050] In an optional embodiment of the present invention, the swimming valve 40 includes a swimming valve seat 41 and a swimming valve ball 42. The outer wall of the swimming valve seat 41 is sealingly and slidingly matched with the inner wall of the pump barrel 10. The swimming valve seat 41 is provided with a swimming valve cavity 43 which passes through the swimming valve seat 41 from top to bottom. The swimming valve ball 42 is arranged above the swimming valve seat 41 and can close the swimming valve cavity 42. The output end of the pneumatic cylinder 20 is fixedly connected to the swimming valve seat 41 and can drive the swimming valve seat 41 to move up and down.

[0051] In this embodiment, the connection position between the output end of the pneumatic cylinder 20 and the floating valve seat 41 is spaced from the floating valve cavity 43 so that the output end of the pneumatic cylinder 20 does not interfere with the normal rise and fall of the floating valve ball 42 .

[0052] In an optional example of this embodiment, a limiting structure 44 is provided at the top end of the floating valve seat 41 to prevent the floating valve ball 42 from falling out.

[0053] In an optional example, the limiting structure 44 is a spherical cover with a hollow structure, and there is enough space inside the spherical cover to ensure that the floating valve ball 42 can move upward a certain distance to completely open the floating valve cavity 43 to ensure the normal flow of liquid.

[0054] In an optional embodiment of the present invention, the second fixed valve 50 includes a second fixed valve seat 51 and a second valve ball 52. The outer wall of the second fixed valve seat 51 is fixedly connected to the inner wall of the pump barrel 10. The second fixed valve seat 51 is provided with a second valve cavity 53 which passes through from top to bottom. The second valve ball 52 is arranged above the second fixed valve seat 51 and can close the second valve cavity 53.

[0055] In the present invention, the first fixed valve seat 31 and the second fixed valve seat 51 are both fixedly connected to the pump barrel 10 via fixing pins.

[0056] In an optional embodiment of the present invention, Figures 4 to 6As shown, the pneumatic cylinder 20 includes a cylinder body 21, a partition 22, a first piston 23, a second piston 24 and an air pipe 27. The cylinder body 21 is hollow inside and forms a receiving chamber. The partition 22 is arranged in a vertical direction and divides the receiving chamber into a first chamber 28 and a second chamber 29 that are not connected to each other. The upper part of the first chamber 28 has an air inlet connected to the air pipe 27, and the lower part of the first chamber 28 has an exhaust hole 60 connected to the atmosphere. The second chamber 29 below the second piston 24 is filled with gas. The first piston 23 is arranged horizontally in the first chamber 28 and connected to the first chamber 29. The inner wall of the cavity 28 is sealed and slidably matched, the second piston 24 is arranged horizontally in the second cavity 29 and is sealed and slidably matched with the inner wall of the second cavity 29, the output end of the pneumatic cylinder 20 includes a connecting rod body and two connecting rods 25 26, the two connecting rods 25 are arranged vertically and in parallel, the two connecting rods 25 are respectively fixedly connected to the bottom ends of the first piston 23 and the second piston 24, the bottom ends of the two connecting rods 25 respectively penetrate downward through the cylinder body 21 and are sealed and slidably matched with the cylinder body 21, and the top end of the connecting rod body 26 is respectively fixedly connected to the bottom ends of the two connecting rods 25. With the above structure, the first piston 23 and the second piston 24 are fixedly connected to the connecting rod body 26 through the connecting rod 25, respectively, so that the first piston 23 and the second piston 24 can move synchronously. The gas can be continuously filled into the first cavity 28 through the gas pipe 27. The gas pressure of the upper part of the first piston 23 located in the first cavity 28 increases. When the force of the gas pressure in the upper part of the first cavity 28 acting on the first piston 23 is greater than the force of the sealing gas in the lower part of the second cavity 29 acting on the second piston 24, the first piston 23 and the second piston 24 move downward. When the first piston 23 and the second piston 24 move downward to a certain stroke (the first piston 23 moves downward to the bottom of the exhaust hole 30), the exhaust hole 20 discharges the high-pressure gas in the upper part of the first cavity 28. At this time, the upper part of the first piston 23 is depressurized, and the sealing gas in the lower part of the second cavity 29 pushes the first piston 23 and the second piston 24 upward. In the above process, the connecting rod body 26 fixedly connected to the first piston 23 and the second piston 24 moves up and down with the first piston 23 and the second piston 24 and drives the floating valve 40 to move up and down in the flow guide cavity 11. It should be noted that when the gas in the first cavity 28 is discharged from the exhaust hole 30, the gas pressure in the first cavity 28 instantly drops to the same as the atmospheric pressure, and then the second piston 24 moves upward under the push of the sealing gas at the lower part of the second cavity 29.

[0057] In an optional example of this embodiment, the bottom end of the connecting rod body 26 passes through the first fixed valve 30 and is fixedly connected to the traveling valve 40 .

[0058] As the first piston 23 and the second piston 24 continuously move downward and upward, the traveling valve 40 of the pneumatic oil pump 100 proposed by the present invention forms a negative pressure in the pump barrel 10. As long as the lower part of the oil pipe is deeply below the dynamic liquid surface, the fluid in the well will enter the pump barrel 10 under the suction action of the pump and flow upward along the guide cavity 11. With the above structure, there is no need to sink the pump barrel 10 below the dynamic liquid surface, the installation depth of the pump barrel 10 is not limited, and the adaptability range is relatively large.

[0059] In an optional example of this embodiment, the cylinder body 21 and the partition plate 22 are both made of metal.

[0060] In an optional example of this embodiment, the connecting rod 24 is disposed on one side of the second cavity.

[0061] In another optional example of this embodiment, the connecting rod 24 is disposed on one side of the first cavity 26 .

[0062] In an optional example of this embodiment, the outer diameter of the cylinder body 21 is smaller than half of the inner diameter of the flow guiding cavity 11 to ensure that there is enough space in the flow guiding cavity 11 for the flow of liquid.

[0063] In an optional example of this embodiment, the outer wall of the cylinder body 21 is fixedly connected to the inner wall of the pump barrel 10 .

[0064] In an optional embodiment of the present invention, the pump barrel 10 includes an upper joint 12, a pump barrel body 13 and a lower joint 14 which are sequentially connected from top to bottom.

[0065] In an optional example, the pneumatic cylinder 20 and the first fixed valve 30 are respectively fixedly connected to the pump barrel body 13 , and the second fixed valve 50 is fixedly connected to the lower joint 14 .

[0066] Please refer to Figures 1 to 6 The specific use process of the pneumatic oil pump 100 proposed by the present invention is now described in detail in conjunction with an embodiment:

[0067] After the pneumatic oil pump 100 is connected to the production pipe string, the first cavity 26 can be continuously filled with high-pressure gas through the upper lateral gas pipe 25. When the upper gas pressure of the right half piston 23 (the part of the piston 23 located in the first cavity 26) continues to increase and is greater than the lower gas pressure of the left half piston 23 (the part of the piston 23 located in the second cavity 27), the piston 23 moves downward, driving the connecting rod 24 to push the swimming valve 40 to move downward. At this time, the swimming valve 40 opens, and the liquid flows from the lower part of the swimming valve 40 into the upper guide cavity 11; as the piston 23 continues to move downward, when the piston 23 moves to the exhaust hole 28, the pressure is relieved, the upper pressure of the piston 23 is reduced, and the gas at the lower part of the second cavity 27 will push the piston 23 to move upward. The piston 23 drives the swimming valve 40 to move upward through the connecting rod 24, and the swimming valve 40 is closed, so that the fluid in the guide cavity 11 is squeezed out of the guide cavity 11 upward. This reciprocating cycle realizes the suction function of the pneumatic oil pump 100.

[0068] The detailed explanation of the above-mentioned embodiments is only intended to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions cannot be interpreted as limitations on the present invention for any reason. In particular, the various features described in different embodiments may also be arbitrarily combined with each other to form other embodiments. Unless there is a clear description to the contrary, these features should be understood to be applicable to any embodiment and are not limited to the described embodiments.

Claims

1. A pneumatic oil pump, characterized in that: The pneumatic oil pump comprises a pump barrel, a pneumatic cylinder, a first fixed valve, a floating valve and a second fixed valve. The pump barrel has a flow guide cavity which passes through from top to bottom. The pneumatic cylinder, the first fixed valve, the floating valve and the second fixed valve are sequentially arranged in the flow guide cavity from top to bottom. The first fixed valve, the floating valve and the second fixed valve are all single-flow valves which only allow liquid to flow upward. The first fixed valve and the second fixed valve are sealed and fixedly connected to the inner wall of the pump barrel. The floating valve is sealed and slidably matched with the inner wall of the pump barrel. The output end of the pneumatic cylinder passes through the first fixed valve and is connected to the floating valve. The floating valve moves up and down under the drive of the pneumatic cylinder. The pneumatic cylinder comprises a cylinder body, a partition, a first piston, a second piston and an air pipe. The interior of the cylinder body is hollow and forms a containing chamber. The partition is arranged in a vertical direction and divides the containing chamber into a first chamber and a second chamber that are not connected to each other. The upper part of the first chamber has an air inlet connected to the air pipe, and high-pressure gas is filled into the first chamber through the air pipe. The lower part of the first chamber has an exhaust hole connected to the atmosphere. The second chamber below the second piston is filled with gas. The first piston is horizontally arranged in the first chamber and is in sealing and sliding cooperation with the inner wall of the first chamber. The second piston is horizontally arranged in the second chamber and is in sealing and sliding cooperation with the inner wall of the second chamber. The output end of the pneumatic cylinder comprises a connecting rod body and two connecting rods. The two connecting rods are arranged vertically and parallelly. The two connecting rods are fixedly connected to the bottom ends of the first piston and the second piston respectively. The bottom ends of the two connecting rods respectively penetrate downwardly through the cylinder body and are fixedly connected to the connecting rod body. The two connecting rods are in sealing and sliding cooperation with the cylinder body.

2. The pneumatic oil pump according to claim 1, characterized in that: The first fixed valve includes a first fixed valve seat and a first valve ball. The outer wall of the first fixed valve seat is fixedly connected to the inner wall of the pump barrel. The first fixed valve seat is provided with a first valve cavity which runs through from top to bottom. The first valve ball is arranged above the first fixed valve seat and can close the first valve cavity. The output end of the pneumatic cylinder passes through the first fixed valve seat and is sealingly and slidingly matched with the first fixed valve seat.

3. The pneumatic oil pump according to claim 1, characterized in that: The traveling valve includes a traveling valve seat and a traveling valve ball. The outer wall of the traveling valve seat is sealingly and slidingly matched with the inner wall of the pump barrel. The traveling valve seat is provided with a traveling valve cavity which passes through the traveling valve seat from top to bottom. The traveling valve ball is arranged above the traveling valve seat and can close the traveling valve cavity. The output end of the pneumatic cylinder is fixedly connected to the traveling valve seat and can drive the traveling valve seat to move up and down.

4. The pneumatic oil pump according to claim 3, characterized in that: The top end of the floating valve seat is also provided with a limiting structure capable of preventing the floating valve ball from falling out.

5. The pneumatic oil pump according to claim 1, characterized in that: The second fixed valve includes a second fixed valve seat and a second valve ball. The outer wall of the second fixed valve seat is fixedly connected to the inner wall of the pump barrel. The second fixed valve seat is provided with a second valve cavity which runs through from top to bottom. The second valve ball is arranged above the second fixed valve seat and can close the second valve cavity.

6. The pneumatic oil pump according to claim 1, characterized in that: The output end of the pneumatic cylinder also includes a connecting rod body, the top end of the connecting rod body is fixedly connected to the bottom ends of the two connecting rods respectively, and the bottom end of the connecting rod body passes through the first fixed valve and is fixedly connected to the traveling valve.

7. The pneumatic oil pump according to claim 1, characterized in that: The outer diameter of the cylinder body is smaller than half of the inner diameter of the flow guide cavity.

8. The pneumatic oil pump according to claim 1, characterized in that: The outer wall of the cylinder body is fixedly connected to the inner wall of the pump barrel.

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