Integrated quantitative pneumatic pump

Abstract

The utility model discloses an integrated quantitative pneumatic pump which comprises a pump body and an oil-gas mixing block which are connected through a screw and an oil way connector. The pump body comprises a cavity, a gas path channel and an oil pumping mechanism; the oil pumping mechanism comprises a piston assembly and a one-way oil conveying sleeve which are arranged in the cavity. The one-way oil conveying sleeve and the cavity are installed in an interference fit mode through the sealing ring and pressed tightly through the pump body and the oil-gas mixing block, and a quantitative oil inlet cavity is formed by the one-way oil conveying sleeve and the piston rod. The cavity is divided into an upper air cavity and a lower oil cavity by the piston assembly; the oil way connector penetrates through the mixing cavity to be connected with the one-way oil conveying sleeve, and the oil way connector and the one-way oil conveying sleeve are each provided with a one-way valve structure. The lubricating oil pump effectively prevents lubricating oil from being sucked back and flowing back, and is simple in structure, convenient to disassemble and convenient to maintain in the later period.

Description

Technical Field

[0001] The utility model relates to a pneumatic pump of an oil pumping device in an oil and gas lubrication system, in particular to an integrated metering pneumatic pump. Background Art

[0002] As a conveying machine, a pneumatic pump uses compressed air as a power source and has good pumping performance for various liquids, especially lubricating oil. In existing pneumatic pumps, the pump body and the oil-gas mixing block are mostly integrated, which makes the structure of the pneumatic pump complex; and a device for preventing the reverse suction of lubricating oil is conventionally provided in the existing pneumatic pump, but this design still has the phenomenon of air suction or reverse suction of lubricating oil.

[0003] The patent application No. CN201920039164.3 discloses a metering oil and gas lubrication pump, which includes a pump body with an oil inlet cavity, an oil pumping mechanism and a check mechanism arranged in the pump body. An oil suction hole communicating with the oil inlet cavity is opened on the side wall of the pump body; the oil pumping mechanism includes a pneumatic piston sliding in the pump body in a sealed manner, a metering plunger rod installed on the piston, and an oil delivery sleeve for delivering lubricating oil to an external mechanism; the oil delivery sleeve is sealed and installed in the pump body and forms the oil inlet cavity with the piston. The oil delivery sleeve has an oil delivery channel, and an oil inlet hole communicating the oil delivery channel and the oil inlet cavity is arranged on the side wall of the oil delivery sleeve. An oil outlet channel communicating with the oil delivery channel is opened on the pump body; one end of the metering plunger rod is installed on the piston, and the other end is sealed and penetrates through the oil delivery channel; the check mechanism is installed at the oil outlet end of the oil delivery sleeve and has a one-way check function to prevent the lubricating oil in the oil outlet channel from flowing back reversely into the oil inlet cavity. This utility model sets up a check mechanism to prevent the reverse suction of lubricating oil, but it fails to completely solve this problem; moreover, the structure of the oil pumping mechanism of this device is complex and not convenient for later maintenance, disassembly and assembly. Summary of the Utility Model

[0004] The utility model provides an integrated metering pneumatic pump to solve the above problems in the prior art.

[0005] The technical solution of the utility model is as follows:

[0006] The utility model provides an integrated quantitative pneumatic pump, which comprises a pump body and an oil-gas mixing block. The two are fixedly connected through fasteners and an oil circuit joint. The oil-gas mixing block comprises an air inlet and an oil outlet, which are connected through a mixing cavity. The pump body comprises a cavity, an air circuit channel and an oil pumping mechanism. The oil pumping mechanism comprises a piston assembly and a one-way oil delivery sleeve in the cavity. The one-way oil delivery sleeve is installed in an interference fit with the cavity through a sealing ring, and is pressed by the pump body and the oil-gas mixing block to form a quantitative oil inlet cavity with the piston rod. The piston assembly divides the cavity into an upper air cavity and a lower oil cavity. The oil circuit joint passes through the mixing cavity and is connected with the one-way oil delivery sleeve. Both the oil circuit joint and the one-way oil delivery sleeve are provided with one-way valve structures.

[0007] Further, a top press head is fixedly installed on the pump body.

[0008] Further, the air circuit channel connects the cavity and the air inlet of the oil-gas mixing block.

[0009] Further, the piston assembly comprises a piston, a sealing ring and a spring assembly. An annular groove is arranged on the piston, and the sealing ring is installed in the annular groove and tightly slides with the inner wall of the cavity. The spring assembly is fixed between the piston and the one-way oil delivery sleeve.

[0010] Further, the piston rod is detachably installed on the piston, and the other end is sleeved into the one-way oil delivery sleeve.

[0011] Further, the one-way oil delivery sleeve comprises an oil inlet hole, an oil delivery channel, an oil outlet channel and a one-way valve structure. The one-way valve structure is arranged at the connection of the oil delivery channel and the oil outlet channel.

[0012] Further, the one-way valve structure comprises a conical piston, a return spring and a piston base. One end of the return spring abuts against the conical piston, and the other end abuts against the piston base. The piston base is provided with a movable hole for the conical piston rod to move, and through holes are arranged around the movable hole. The piston base is fixed in the oil outlet channel.

[0013] Further, the oil circuit joint comprises an oil circuit joint valve sleeve threadedly connected with the oil outlet channel and the oil circuit mixing block, an oil circuit joint plug threadedly connected with the inner cavity of the top of the oil circuit joint, and an oil circuit joint piston rod arranged in the inner cavity. The oil circuit joint plug is provided with a cylindrical oil inlet hole, and a conical hole is arranged at the end of the oil inlet hole. The oil circuit joint piston rod is embedded in the conical hole of the oil circuit joint plug, and the oil circuit joint piston rod abuts against the inner wall of the conical hole under the drive of the oil circuit joint return spring.

[0014] Further, an oil outlet is arranged on the side wall of the oil circuit joint, and the oil outlet communicates the mixing cavity with the inner cavity of the oil circuit joint.

[0015] Further, the pump body is provided with a hole communicating with the fuel tank.

[0016] Compared with the prior art, the beneficial effects of an integrated metering pneumatic pump provided by the utility model are as follows: both the one-way oil delivery sleeve and the oil circuit joint of the utility model are provided with one-way valve structures, and after the two are connected, a double one-way delivery structure is formed, which more effectively prevents the backflow of lubricating oil; the pump body and the oil-gas mixing block of the utility model are connected by screws and the oil circuit joint, with a simple structure, more convenient disassembly, and facilitating later maintenance. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of the integrated metering pneumatic pump;

[0018] Figure 2 It is an exploded structure schematic diagram of the integrated metering pneumatic pump;

[0019] Figure 3 It is a schematic diagram of the structure of the one-way oil delivery sleeve of the integrated metering pneumatic pump;

[0020] Figure 4 It is a schematic diagram of the structure of the oil circuit joint of the integrated metering pneumatic pump;

[0021] Among them, the reference numerals in the figures: 1. oil-gas mixing block; 2. inlet; 3. oil outlet; 4. oil circuit joint; 5. air inlet; 6. O-ring one; 7. O-ring two; 8. O-ring three; 9. one-way valve of the one-way oil delivery sleeve; 10. metering oil inlet cavity; 11. one-way oil delivery sleeve; 12. oil inlet hole; 13. return spring; 14. piston rod; 15. gas path channel; 16. seal ring; 17. piston; 18. top press head; 19. mixing cavity; 20. fixing screw; 21. oil injection hole; 22. pump body; 23. conical piston; 24. base; 25. return spring; 26. oil delivery channel; 27. oil cavity; 28. oil outlet channel; 29. return spring of the oil circuit joint; 30. valve sleeve of the oil circuit joint; 31. plug of the oil circuit joint; 32. oil inlet; 33. piston rod of the oil circuit joint; 34. oil outlet of the oil circuit joint. Detailed Implementation Modes

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. Additionally, it should be noted that when a component is referred to as being "connected to" another component, it can be directly or indirectly connected to the other component. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or position based on the orientation or position shown in the drawings, and are only for the convenience of description and cannot be construed as a limitation to the present technical solution. The meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0023] The present utility model will be further described below in conjunction with specific embodiments. Among them, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams rather than physical diagrams, and cannot be construed as a limitation to this patent; in order to better illustrate the embodiments of the present utility model, some components in the drawings will be omitted, enlarged or reduced, and do not represent the dimensions of actual products; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0024] Embodiment 1

[0025] Please refer to Figures 1-4 , an integrated quantitative pneumatic pump provided by the present utility model, characterized in that it includes a pump body 22 and an oil-gas mixing block 1, which are connected by fixing screws 20 and an oil circuit joint 4; the oil-gas mixing block 1 includes an air inlet 5 and an oil outlet 12, which are connected by a mixing chamber 19; the pump body 22 includes a cavity, an air passage 15 and an oil pumping mechanism; the air passage 15 connects the cavity and the air inlet 5 of the oil-gas mixing block, and an O-ring seal 6 is provided on the contact surface between the two; the oil pumping mechanism includes a piston assembly and a one-way oil delivery sleeve 11 in the cavity; the one-way oil delivery sleeve 11 is installed in interference fit with the cavity through an O-ring seal 8, and is pressed by the pump body 22 and the oil-gas mixing block 1 to form a quantitative oil inlet chamber 10 with the piston rod 14; the piston assembly divides the cavity into an upper air chamber and a lower oil chamber; the oil circuit joint 4 passes through the mixing chamber 19 and is connected to the one-way oil delivery sleeve 11, and both the oil circuit joint 4 and the one-way oil delivery sleeve 11 are provided with one-way valve structures. A top press head 18 is also fixedly installed on the pump body.

[0026] The piston assembly consists of a piston 17, a sealing ring 16 and a return spring 13. The sealing ring 16 is fixed in the side groove of the piston seat to form a sealed moving cavity. The piston 17 and the sealing ring 16 divide the cavity into an upper air cavity and a lower oil cavity. The piston rod 14 of the piston is inserted into the oil delivery sleeve 11 of the one-way valve. The return spring 13 is arranged between the piston 17 and the one-way oil delivery sleeve 11 to ensure that the piston 17 makes reciprocating motion in the cavity. Compared with the piston structure of the previous pneumatic pump, the structure of this assembly is simpler. The piston is integrally formed by machining, and the sealing ring can be conveniently installed and replaced.

[0027] The one-way oil delivery sleeve 11 includes an oil inlet hole 12, an oil delivery channel 26, an oil outlet channel 28, and a one-way valve 9 of the one-way oil delivery sleeve. The one-way oil delivery sleeve 11 is fixedly installed in the cavity in a sealed fit, and an O-ring 8 is provided at the part in contact with the pump body, and an O-ring 7 is provided at the part in contact with the oil-gas mixing block 1. A number of circular oil inlet holes 12 are opened on the side wall of the one-way oil delivery sleeve 11, and the center is an oil delivery channel 26 for the piston rod to move. A step for fixing the return spring is provided at the upper end of the circular oil inlet hole 12. The oil inlet hole 12 connects the oil delivery channel 26 and the oil cavity 27. The piston rod 14 is located between the oil inlet hole 12 and the piston seat. During the process of the piston rod 14 retracting in the oil delivery channel 26, the lubricating oil in the oil inlet cavity 27 is sucked into the oil delivery channel 26. During the process of the piston rod 14 pressing down in the oil delivery channel 26, the lubricating oil in the oil delivery channel 26 is pressed towards the one-way valve 9 in the one-way oil delivery sleeve 11 and further output to the oil-gas mixing block 1. The fixed oil inlet cavity 10 between the oil inlet hole and the one-way valve is the single fixed oil delivery displacement. The one-way valve 9 of the oil delivery sleeve consists of a conical piston 23, a return spring 25 and a piston base 24. The piston base 24 is fixed in the one-way oil delivery sleeve 11 by threads, and there is a moving hole for the conical piston rod to move on it. A number of through holes are opened around the moving hole for the lubricating oil to flow through. Compared with the structure of the previous pneumatic pump, this one-way oil delivery sleeve combines the oil delivery sleeve and the one-way valve and is installed in the pump body by interference fit, with simple installation and maintenance. The one-way valve can limit the reverse flow of the lubricating oil in the oil outlet channel of the oil delivery sleeve back into the oil delivery channel, ensuring that the piston rod can smoothly suck the lubricating oil into the oil delivery channel during the process of withdrawing from the oil delivery channel and is not prone to air suction phenomenon.

[0028] The oil circuit joint 11 is also provided with a check valve structure, which can limit the reverse flow of the lubricating oil in the mixing block to the one-way oil delivery sleeve. The setting of the two check valves can better ensure the one-way output of the lubricating oil. The oil circuit joint includes an oil circuit joint valve sleeve 30 threadedly connected to the oil outlet channel and the oil circuit mixing block, an oil circuit joint plug 31 threadedly connected to the inner cavity at the top of the oil circuit joint, and an oil circuit joint piston rod 33 arranged in the inner cavity; the oil circuit joint plug is provided with a cylindrical oil inlet hole 32, and a tapered hole is arranged at the end of the oil inlet hole; the oil circuit joint piston rod 33 is embedded in the tapered hole of the oil circuit joint plug, and the oil circuit joint piston rod is urged by a return spring 29 to abut against the inner wall of the tapered hole. An oil outlet 34 is opened on the side wall of the oil circuit joint, and the oil outlet communicates the mixing cavity with the inner cavity of the oil circuit joint.

[0029] During operation, compressed air is connected to the mixing block inlet 2, and reaches the air cavity through the air inlet 5 and the air path channel 15 of the mixing block, pushing the piston rod 14 to move downward. After reaching the lower limit position, the air supply stops; then the return spring 13 pushes the piston rod 14 to move upward, creating a negative pressure at the metering oil inlet cavity 10. The lubricating oil reaches the metering oil inlet cavity 10 through the oil inlet 12 on the one-way oil delivery sleeve 11. After the piston rod 14 reaches the limit position, the oil suction action ends. When the air supply is resumed, the piston rod 14 pushes the lubricating oil in the metering oil inlet cavity 10 downward through the one-way oil delivery sleeve 11 and the oil circuit joint 4 into the mixing cavity 19. At the same time, the compressed air enters the mixing cavity 19 through the air inlet 5 of the oil-gas mixing block and mixes with the lubricating oil. The oil-gas mixture leaves through the oil outlet 3 of the oil-gas mixing block and goes to the corresponding pipeline.

[0030] Embodiment 2

[0031] Please refer to Figures 1-4 A one-piece metering pneumatic pump provided by the present utility model is characterized in that it includes a pump body 22 and an oil-gas mixing block 1, which are connected by fixing screws 20 and an oil circuit joint 4; the oil-gas mixing block 1 includes an air inlet 5 and an oil outlet 12, which are connected by a mixing cavity 19; the pump body 22 includes a cavity, an air path channel 15 and an oil pumping mechanism; the air path channel 15 connects the cavity and the air inlet 5 of the oil-gas mixing block, and an O-ring seal 6 is arranged on the contact surface between the two; the oil pumping mechanism includes a piston assembly in the cavity and a one-way oil delivery sleeve 11; the one-way oil delivery sleeve 11 is installed in interference fit with the cavity through an O-ring seal 8, and is pressed by the pump body 22 and the oil-gas mixing block 1 to form a metering oil inlet cavity 10 with the piston rod 14; the piston assembly divides the cavity into an upper air cavity and a lower oil cavity; the oil circuit joint 4 passes through the mixing cavity 19 and is connected to the one-way oil delivery sleeve 11, and both the oil circuit joint 4 and the one-way oil delivery sleeve 11 are provided with check valve structures. A top press head 18 is also fixedly installed on the pump body.

[0032] The piston assembly consists of a piston 17, a sealing ring 16 and a return spring 13. The sealing ring 16 is fixed in the side groove of the piston seat to form a sealed movable cavity. The piston 17 and the sealing ring 16 divide the cavity into an upper air cavity and a lower oil cavity. The piston rod 14 of the piston is inserted into the oil delivery sleeve 11 of the one-way valve. The return spring 13 is arranged between the piston 17 and the one-way oil delivery sleeve 11 to ensure that the piston 17 makes reciprocating motion in the cavity. Compared with the piston structure of the previous pneumatic pump, the structure of this assembly is simpler. The piston is integrally formed by machining, and the sealing ring can be conveniently installed and replaced.

[0033] The one-way oil delivery sleeve 11 includes an oil inlet hole 12, an oil delivery channel 26, an oil outlet channel 28, and a one-way valve 9 of the one-way oil delivery sleeve. The one-way oil delivery sleeve 11 is fixedly installed in the cavity in a sealed and mating manner, and an O-ring III 8 is provided at the part in contact with the pump body, and an O-ring II 7 is provided at the part in contact with the oil-gas mixing block 1. A number of circular oil inlet holes 12 are opened on the side wall of the one-way oil delivery sleeve 11, and the center is an oil delivery channel 26 for the piston rod to move. A step for fixing the return spring is provided at the upper end of the circular oil inlet hole 12. The oil inlet hole 12 connects the oil delivery channel 26 and the oil cavity 27. The piston rod 14 is located between the oil inlet hole 12 and the piston seat. During the process of the piston rod 14 retracting in the oil delivery channel 26, the lubricating oil in the oil inlet cavity 27 is sucked into the oil delivery channel 26. During the process of the piston rod 14 pressing down in the oil delivery channel 26, the lubricating oil in the oil delivery channel 26 is pressed towards the one-way valve 9 in the one-way oil delivery sleeve 11 and further output to the oil-gas mixing block 1. The fixed oil inlet cavity 10 between the oil inlet hole and the one-way valve is the single fixed oil delivery displacement. The one-way valve 9 of the oil delivery sleeve consists of a conical piston 23, a return spring 25 and a piston base 24. The piston base 24 is fixed in the one-way oil delivery sleeve 11 by threads, and there is a movable hole for the conical piston rod to move on it. A number of through holes are opened around the movable hole for the lubricating oil to flow through. Compared with the structure of the previous pneumatic pump, this one-way oil delivery sleeve combines the oil delivery sleeve and the one-way valve together and is installed in the pump body by interference fit, with simple installation and maintenance. The one-way valve can limit the reverse flow of the lubricating oil in the oil outlet channel of the oil delivery sleeve back into the oil delivery channel, ensuring that the piston rod can smoothly suck the lubricating oil into the oil delivery channel during the process of withdrawing from the oil delivery channel and is not prone to air suction phenomenon.

[0034] The oil circuit joint 11 is also provided with a one-way valve structure, which can restrict the reverse flow of the lubricating oil in the mixing block to the one-way oil delivery sleeve. The setting of the two one-way valves can better ensure the one-way output of the lubricating oil. The oil circuit joint includes an oil circuit joint valve sleeve 30 threadedly connected to the oil outlet passage and the oil circuit mixing block, an oil circuit joint plug 31 threadedly connected to the inner cavity at the top of the oil circuit joint, and an oil circuit joint piston rod 33 arranged in the inner cavity; the oil circuit joint plug is provided with a cylindrical oil inlet hole 32, and a tapered hole is provided at the end of the oil inlet hole; the oil circuit joint piston rod 33 is embedded in the tapered hole of the oil circuit joint plug, and the oil circuit joint piston rod is urged by a return spring 29 to abut against the inner wall of the tapered hole. An oil outlet 34 is formed on the side wall of the oil circuit joint, and the oil outlet communicates the mixing cavity with the inner cavity of the oil circuit joint.

[0035] Further, the pump body is provided with an oil injection hole 21, and the oil injection hole is communicated with an external oil tank to continuously supply lubricating oil to the pneumatic pump.

[0036] During operation, compressed air is connected to the mixing block inlet 2, and reaches the air cavity through the air inlet 5 and the air path channel 15 of the mixing block, pushing the piston rod 14 to move downward. After reaching the lower limit position, the air supply stops; then the return spring 13 pushes the piston rod 14 to move upward, causing a negative pressure to be formed at the metering oil inlet cavity 10. The lubricating oil reaches the metering oil inlet cavity 10 through the oil inlet 12 on the one-way oil delivery sleeve 11. After the piston rod 14 reaches the limit position, the oil suction action ends. When the air supply is resumed, the piston rod 14 pushes the lubricating oil in the metering oil inlet cavity 10 downward through the one-way oil delivery sleeve 11 and the oil circuit joint 4 into the mixing cavity 19. At the same time, the compressed air enters the mixing cavity 19 through the air inlet 5 of the oil-gas mixing block and is mixed with the lubricating oil. The oil-gas mixture leaves from the oil outlet 3 of the oil-gas mixing block and goes to the corresponding pipeline.

[0037] Embodiment 3

[0038] Please refer to Figures 1-4 As shown in, an integrated metering pneumatic pump provided by the present invention is characterized in that it includes a pump body 22 and an oil-gas mixing block 1, which are connected by fixing screws 20 and an oil circuit joint 4; the oil-gas mixing block 1 includes an air inlet 5 and an oil outlet 12, which are connected through a mixing cavity 19; the pump body 22 includes a cavity, an air path channel 15 and an oil pumping mechanism; the air path channel 15 connects the cavity and the air inlet 5 of the oil-gas mixing block, and an O-ring seal 6 is arranged on the contact surface between the two; the oil pumping mechanism includes a piston assembly and a one-way oil delivery sleeve 11 in the cavity; the one-way oil delivery sleeve 11 is installed in interference fit with the cavity through an O-ring seal 8 and is pressed by the pump body 22 and the oil-gas mixing block 1 to form a metering oil inlet cavity 10 with the piston rod 14; the piston assembly divides the cavity into an upper air cavity and a lower oil cavity; the oil circuit joint 4 passes through the mixing cavity 19 and is connected to the one-way oil delivery sleeve 11, and both the oil circuit joint 4 and the one-way oil delivery sleeve 11 are provided with one-way valve structures. A top press head 18 is also fixedly installed on the pump body.

[0039] The piston assembly consists of a piston 17, a sealing ring 16 and a return spring 13. The sealing ring 16 is fixed in the side groove of the piston seat to form a sealed active cavity. The piston 17 and the sealing ring 16 divide the cavity into an upper air cavity and a lower oil cavity. The piston rod 14 of the piston is inserted into the one-way valve oil delivery sleeve 11. The return spring 13 is set between the piston 17 and the one-way oil delivery sleeve 11 to ensure that the piston 17 reciprocates in the cavity. The assembly structure is simpler than the previous pneumatic pump piston structure. The piston is machined in one piece, and the sealing ring can be easily installed and replaced.

[0040] Furthermore, the piston rod 14 is movably mounted on the piston to facilitate later maintenance and disassembly.

[0041] The one-way oil delivery sleeve 11 includes an oil inlet hole 12, an oil delivery channel 26, an oil outlet channel 28, and a one-way oil delivery sleeve check valve 9. The one-way oil delivery sleeve 11 is sealed and fixedly installed in the cavity, and an O-ring 3 8 is provided at the part in contact with the pump body, and an O-ring 2 7 is provided at the part in contact with the oil-gas mixing block 1. A plurality of circular oil inlet holes 12 are opened on the side wall of the one-way oil delivery sleeve 11, and the center is the oil delivery channel 26 for the movement of the piston rod. The upper end of the circular oil inlet hole 12 is provided with a step for fixing the return spring. The oil inlet hole 12 connects the oil delivery channel 26 with the oil cavity 27, and the piston rod 14 is located between the oil inlet hole 12 and the piston seat. When the piston rod 14 retracts in the oil delivery channel 26, the lubricating oil in the oil delivery cavity 27 is sucked into the oil delivery channel 26. During the process of the piston rod 14 pressing down in the oil delivery channel 26, the lubricating oil in the oil delivery channel 26 is pressed toward the one-way valve 9 in the one-way oil delivery sleeve 11, and further output to the oil-gas mixing block 1. The quantitative oil inlet chamber 10 between the oil inlet hole and the one-way valve is a single fixed oil delivery displacement. The oil delivery sleeve one-way valve 9 is composed of a conical piston 23, a return spring 25 and a piston base 24. The piston base 24 is fixed in the one-way oil delivery sleeve 11 by threads, and has a movable hole for the movement of the conical piston rod. A number of through holes are opened around the movable hole for the circulation of lubricating oil. Compared with the previous pneumatic pump structure, this one-way oil delivery sleeve combines the oil delivery sleeve and the one-way valve together, and is installed in the pump body through an interference fit, which is simple to install and maintain. The one-way valve can limit the lubricating oil in the oil delivery sleeve outlet channel from reversing back into the oil delivery channel, ensuring that the piston rod can smoothly absorb the incoming lubricating oil into the oil delivery channel during the process of escaping from the oil delivery channel, and it is not easy to suck in air.

[0042] The oil circuit joint 11 is also provided with a one-way valve structure, which can restrict the reverse flow of the lubricating oil in the mixing block to the one-way oil delivery sleeve. The setting of the two one-way valves can better ensure the one-way output of the lubricating oil. The oil circuit joint includes an oil circuit joint valve sleeve 30 threadedly connected to the oil outlet channel and the oil circuit mixing block, an oil circuit joint plug 31 threadedly connected to the inner cavity at the top of the oil circuit joint, and an oil circuit joint piston rod 33 arranged in the inner cavity; the oil circuit joint plug is provided with a cylindrical oil inlet hole 32, and a tapered hole is arranged at the end of the oil inlet hole; the oil circuit joint piston rod 33 is embedded in the tapered hole of the oil circuit joint plug, and the oil circuit joint piston rod is urged by a return spring 29 to abut against the inner wall of the tapered hole. An oil outlet 34 is formed on the side wall of the oil circuit joint, and the oil outlet communicates the mixing cavity with the inner cavity of the oil circuit joint.

[0043] During operation, compressed air is connected to the mixing block inlet 2, reaches the air cavity through the air inlet 5 and the air path channel 15 of the mixing block, and pushes the piston rod 14 to move downward. After reaching the lower limit position, the air supply stops; then the return spring 13 pushes the piston rod 14 to move upward, creating a negative pressure at the metering oil inlet cavity 10. The lubricating oil reaches the metering oil inlet cavity 10 through the oil inlet 12 on the one-way oil delivery sleeve 11. After the piston rod 14 reaches the limit position, the oil suction action ends. When the air supply is resumed, the piston rod 14 pushes the lubricating oil in the metering oil inlet cavity 10 downward through the one-way oil delivery sleeve 11 and the oil circuit joint 4 into the mixing cavity 19. At the same time, the compressed air enters the mixing cavity 19 through the air inlet 5 of the oil-gas mixing block and mixes with the lubricating oil. The oil-gas mixture leaves through the oil outlet 3 of the oil-gas mixing block and goes to the corresponding pipeline.

[0044] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. An integrated quantitative pneumatic pump, characterized in that: It includes a pump body and an oil-gas mixing block, which are fixedly connected by fasteners and oil line joints; The oil-gas mixing block comprises an air inlet and an oil outlet, which are connected via a mixing chamber; The pump body includes a cavity, an air passage and an oil pumping mechanism; the oil pumping mechanism includes a piston assembly and a one-way oil delivery sleeve in the cavity; the one-way oil delivery sleeve is installed with the cavity through an interference fit through a sealing ring, and is pressed by the pump body and the oil-gas mixing block to form a quantitative oil inlet cavity with the piston rod; the piston assembly divides the cavity into an upper air cavity and a lower oil cavity; The oil circuit joint passes through the mixing chamber and is connected with the one-way oil delivery sleeve. Both the oil circuit joint and the one-way oil delivery sleeve are provided with a one-way valve structure.

2. The integrated quantitative pneumatic pump according to claim 1, characterized in that: A top pressure head is fixedly mounted on the pump body.

3. The integrated quantitative pneumatic pump according to claim 1, characterized in that: The gas path channel connects the cavity and the gas inlet of the oil-gas mixing block.

4. The integrated quantitative pneumatic pump according to claim 1, characterized in that: The piston assembly includes a piston, a sealing ring, and a spring assembly. The piston is provided with an annular groove. The sealing ring is installed in the annular groove and slides tightly with the inner wall of the cavity. The spring assembly is fixed between the piston and the one-way oil delivery sleeve.

5. The integrated quantitative pneumatic pump according to claim 1, characterized in that: The piston rod is detachably mounted on the piston, and the other end is sleeved into the one-way oil delivery sleeve.

6. The integrated quantitative pneumatic pump according to claim 1, characterized in that: The one-way oil delivery sleeve comprises an oil inlet hole, an oil delivery passage, an oil outlet passage, and a one-way valve structure, wherein the one-way valve structure is arranged at the connection between the oil delivery passage and the oil outlet passage.

7. The integrated quantitative pneumatic pump according to claim 6, characterized in that: The one-way valve structure includes a conical piston, a return spring and a piston base; one end of the return spring presses against the conical piston, and the other end presses against the piston base; the piston base is provided with a movable hole for the conical piston rod to move, and through holes are opened around the movable hole, and the piston base is fixed in the oil outlet channel.

8. The integrated quantitative pneumatic pump according to claim 1, characterized in that: The oil circuit joint includes an oil circuit joint valve sleeve threadedly connected to the oil outlet channel and the oil circuit mixing block, an oil circuit joint plug threadedly connected to the inner cavity at the top of the oil circuit joint, and an oil circuit joint piston rod arranged in the inner cavity; the oil circuit joint plug is provided with a cylindrical oil inlet hole, and a conical hole is provided at the end of the oil inlet hole; the oil circuit joint piston rod is embedded in the conical hole of the oil circuit joint plug, and the oil circuit joint piston rod is pressed against the inner wall of the conical hole under the drive of the oil circuit joint return spring.

9. The integrated quantitative pneumatic pump according to claim 8, characterized in that: The side wall of the oil circuit joint is provided with an oil outlet, and the oil outlet is connected with the mixing chamber and the inner cavity of the oil circuit joint.

10. The integrated quantitative pneumatic pump according to claim 1, characterized in that: The pump body is provided with an oil filling hole communicated with the oil tank.

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