Gas-driven oil-gas mixed micro-lubrication pump

Abstract

The application discloses a gas-driven oil-gas mixed micro-lubrication pump, which comprises a pump body, an air inlet block, a driving piston assembly, a one-way check valve assembly, a metering piston and a metering piston body. The driving piston assembly is slidably connected to the inner wall of the pump body. The driving piston assembly and the metering piston body are connected through a reset spring, and an oil storage cavity is defined between the two. The tail of the metering piston is floatingly connected in the driving piston assembly, and the head is slidably connected in the metering piston body. The one-way check valve assembly is arranged at the bottom of the metering piston body and defines an oil storage cavity with the metering piston. The air inlet channel allows gas to enter the pump body through the air inlet and the air inlet channel, pushes the driving piston assembly and drives the metering piston to move downwards. The one-way check valve assembly responds to the movement of the metering piston to make the oil storage cavity and the oil outlet cavity of the air inlet block in fluid communication. Lubricating oil enters the oil storage cavity and then the oil storage cavity, and is discharged through the air outlet.

Description

Technical Field

[0001] This invention relates to the field of lubrication equipment technology, and in particular to a gas-driven oil-gas mixing micro-lubrication pump. Background Technology

[0002] The oil-gas mixed micro-lubrication pump mainly uses a solenoid valve to control compressed gas, which drives the oil pump piston within the pump body. Simultaneously, the piston drives the metering piston rod to pump the lubricating oil out of the oil chamber. The compressed gas also disperses the discharged lubricating oil, forming an oil-gas mixture that lubricates the mechanical parts requiring lubrication and cools related components.

[0003] Chinese invention patent application number 201910021223.9 discloses a quantitative oil-air lubrication pump. For example... Figure 1 , Figure 2 As shown, the existing oil-air lubrication pump includes an oil suction port 303 located on the pump body, an air inlet 405 located on the left side of the pump body, an oil pump plug assembly 42 located on the upper part of the oil pump, a drive piston assembly 43 located inside the oil pump, and a one-way valve assembly 41 located inside the oil pump.

[0004] When the pneumatic pump is working, gas enters the pump body through the pump inlet. Part of the gas flow directly blows towards the parts requiring lubrication, while the other part flows through the internal channel 404 into the area above the drive piston inside the pump. This pushes the drive piston downwards, and the metering piston rod, integrated with the piston, moves downwards simultaneously, conveying the lubricating oil in the oil chamber downwards. This compresses the one-way valve spring and opens the outward oil passage, delivering the lubricating oil to the lower channel of the pump. The squeezed-out lubricating oil encounters the external airflow leading to the lubrication point and is transported to the lubrication area by this airflow. When the gas stops entering the pump body, the one-way check valve resets under the action of the spring to prevent the output lubricating oil from flowing back into the pump body. The drive piston resets to its initial position under the action of the reset spring. During the piston's return, a vacuum negative pressure is formed inside the pump. This negative pressure draws the lubricating oil from outside the pump through the suction port into the internal oil storage chamber, where it awaits the start of the next working cycle.

[0005] The current type of oil pump has the following disadvantages:

[0006] a. The sealing assembly located at the top of the oil pump has a complex structure, which makes it prone to leakage, causing the oil pump to malfunction and increasing the difficulty of maintenance;

[0007] b. The oil pump driving piston is a whole rubber part with a fixed support, and this structure is prone to aging and wear of the rubber due to the sealing of different media, i.e. lubricating oil and air, which affects the sealing of the oil pump. Meanwhile, the installation mode of the metering piston is a rigid installation mode of a pin shaft, which causes the metering piston and the piston sleeve to run out of concentricity, and the metering piston rod and the piston sleeve are prone to running out of air in the case of insufficient air pressure.

[0008] c. The one-way valve reverse prevention mechanism is too complex and is prone to blockage, which causes insufficient oil supply and normal oil supply.

[0009] Therefore, the technical personnel in the art are committed to developing a gas-driven oil-gas mixed micro-lubrication pump to overcome the problems existing in the prior art. SUMMARY

[0010] In view of the above defects of the prior art, the technical problem to be solved by the present application is how to solve the problem of high failure rate caused by design defects, such as blockage, leakage, inaccurate displacement, and abnormal operation of the oil pump.

[0011] To achieve the above-mentioned purpose, the present application provides a gas-driven oil-gas mixed micro-lubrication pump, comprising a pump body, an air inlet block, a driving piston assembly, a one-way check valve assembly, a metering piston, and a metering piston body. The pump body and the air inlet block are detachably connected, and the cover of the pump body is provided with an air inlet channel. The air inlet block comprises a cavity, which is transversely penetrated and forms an air inlet and an air outlet at both ends, and an oil outlet cavity is longitudinally formed in the middle part. The metering piston body is arranged at the bottom of the pump body and abuts against the air inlet block. The driving piston assembly is located inside the pump body and is slidably connected along the inner wall of the pump body and sealed with the inner wall of the pump body by a sealing device. The driving piston assembly and the metering piston body are connected by a return spring, and an oil storage cavity is defined between the two. The oil storage cavity is in communication with the outside of the pump body. The tail of the metering piston is floatingly connected in the driving piston assembly, and the head is slidably connected in the metering piston body. The one-way check valve assembly is arranged at the bottom of the metering piston body and defines an oil storage cavity with the metering piston. The air inlet channel is configured to allow gas to enter the inside of the pump body through the air inlet channel from the air inlet, push the driving piston assembly, and drive the metering piston to move downward. The one-way check valve assembly is configured to respond to the movement of the metering piston to make the oil storage cavity and the oil outlet cavity in fluid communication. The oil storage cavity is configured to allow lubricating oil to enter the oil storage cavity through the oil storage cavity and be discharged through the air outlet. When the gas stops entering the inside of the pump body, the elastic force of the return spring makes the driving piston assembly return to the initial position.

[0012] Further, the air inlet channel of the pump body comprises a first air inlet channel axially formed in the cover of the pump body and radially extending out of the cover at the top of the cover of the pump body, and a second air inlet channel connected with the first air inlet channel at the center of the top of the cover of the pump body and communicating with the interior of the pump body, the first air inlet channel communicates with the cavity of the air inlet block through the through hole formed on the air inlet block, and the outlet of the second air inlet channel is provided with a gas hole plug.

[0013] Further, the bottom of the pump body is provided with a flange, the air inlet block is provided with a mounting hole, and the air inlet block is bolted to the flange of the pump body.

[0014] Further, the bottom of the air inlet block is further provided with a first pin hole, the first pin hole does not communicate with the cavity or the oil outlet cavity of the air inlet block, the flange of the pump body is provided with a second pin hole at a corresponding position, and a spring pin is arranged in the first pin hole and the second pin hole.

[0015] Further, a first sealing ring is arranged between the metering piston body and the inner wall of the pump body, and a second sealing ring is arranged between the bottom of the metering piston body and the air inlet block around the one-way check valve assembly.

[0016] Further, a third sealing ring is arranged between the inlet of the first air inlet channel and the air inlet block.

[0017] Further, the drive piston assembly comprises a drive piston body, a snap spring, a gas sealing ring and an oil sealing ring arranged around and spaced apart between the drive piston body and the inner wall of the pump body, a gas cavity is defined between the top of the drive piston body and the top cover of the pump body, the gas sealing ring is arranged to face the gas cavity, the oil sealing ring is arranged to face the oil storage cavity, the bottom of the drive piston body is provided with a floating connection space for accommodating the tail of the metering piston, and the snap spring is configured to limit the tail of the metering piston in the floating connection space.

[0018] Further, the size of the floating connection space is designed to realize automatic centering with the metering piston body when the metering piston moves downward.

[0019] Further, the lower part of the cover of the pump body is provided with a first oil suction port, the first oil suction port communicates with the oil storage cavity, the metering piston body is provided with a second oil suction port, and when the drive piston assembly returns to the initial position, the oil storage cavity communicates with the oil storage cavity through the second oil suction port.

[0020] Further, the one-way check valve assembly comprises a check valve body, a check valve sealing ring, a check valve spring, a check valve bolt and a check valve washer, the tail of the check valve body is provided with a sealing groove, the check valve sealing ring is arranged on the sealing groove, the check valve bolt is screwed into the oil outlet cavity from the bottom of the air inlet block through the check valve washer and is screwed with the metering piston body, the head of the check valve bolt is provided with a through groove, the check valve spring is arranged in the through groove, the head of the check valve body is connected with the check valve bolt through the check valve spring, and the oil storage cavity is communicated with the oil outlet cavity through the through groove when the metering piston moves downward.

[0021] The present application has the advantages of:

[0022] 1. Oil pump air path portion design: the original pump body rear sealing device composed of a plurality of parts is optimized to only need one plug screw.

[0023] 2. Drive piston mechanism design: the original integrated piston is changed to use two different material sealing rings for sealing, and the use of two material sealing rings has the advantage of better adapting to the separate sealing of oil and air, thereby reducing and delaying the wear and aging speed of the sealing ring.

[0024] 3. Metering piston assembly method optimization: the rigid connection of the original metering piston and the drive piston is optimized to floating connection, so that the piston and the piston sleeve can be self-centered, and the conditions of being stifled and moving jammed are eliminated.

[0025] 4. One-way check valve mechanism: the original structure is optimized, and the one-way check valve mechanism composed of a plurality of parts is optimized to only five parts, which not only reduces the number of one-way check valve parts, but also improves the reliability and maintenance convenience.

[0026] The concept, specific structure and technical effects of the present application will be further described below with reference to the accompanying drawings, so as to fully understand the purpose, features and effects of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a front view of the existing oil-air lubrication pump;

[0028] Figure 2 is a sectional view of the existing oil-air lubrication pump;

[0029] Figure 3 is a front view of a preferred embodiment of the present application;

[0030] Figure 4 is a sectional view of a preferred embodiment of the present application;

[0031] Figure 5 is an exploded view of a preferred embodiment of the present application;

[0032] Figure 6 is a structural schematic view of a drive piston body of a preferred embodiment of the present application;

[0033] Figure 7 is a partial sectional view of a one-way check valve assembly of a preferred embodiment of the present application.

[0034] Wherein, 1-pump body, 2-metering piston, 3-metering piston body, 4-intake block, 5-check valve bolt, 6-return spring, 7-first sealing ring, 8-third sealing ring, 9-second sealing ring, 10-spring pin, 11-sealing gasket, 12-check valve gasket, 13-intake block gasket 14-intake block bolt, 15-check valve spring, 16-clamp spring, 17-plug screw, 18-drive piston body, 19-gas sealing ring, 20-check valve body, 21-check valve sealing ring, 22-oil sealing ring, A-oil storage cavity, B-first intake passage, C-one-way check valve assembly, D-oil storage cavity, E-drive piston assembly, F-gas inlet, G-gas outlet, H-second intake passage. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present application are described below with reference to the accompanying drawings, so that the technical contents of the present application are more clear and easy to understand. The present application can be embodied in many different forms, and the protection scope of the present application is not limited to the embodiments mentioned herein.

[0036] In the drawings, the same components have the same reference numerals, and components having similar structures or functions are denoted by similar reference numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present application is not limited to the size and thickness of each component. In order to make the drawing clearer, the thickness of some components is appropriately exaggerated in some places in the drawing.

[0037] In view of the problems of the prior art, the present application makes corresponding innovative design.

[0038] a. The upper sealing assembly of the pump body which is prone to failure is designed as a whole, and the same function is achieved by increasing the oil pump internal gas passage, so that the existing complex sealing assembly is replaced by only one screw.

[0039] b. The driving piston is newly designed, and two different materials of sealing rings are used to seal oil and gas respectively, so as to reduce the aging and wear time of rubber, improve the service life and operation reliability of the oil pump. At the same time, the installation mode of the metering piston and the metering piston rod is also revolutionarily changed. The original rigid connection using fixed hole is changed into floating connection with snap spring limiting, which solves the problem of running jam in the assembly and operation process of other products. The automatic centering of the product is realized.

[0040] c. The existing type of one-way check valve is redesigned, and the function of the original 9 parts is optimized to 5 parts. The operation reliability and maintenance convenience of the mechanism are improved. EMBODIMENT

[0041] Figure 3 is the overall structure of the oil-gas mixed microlubrication pump of the embodiment, Figure 4 is a sectional view of the oil-gas mixed microlubrication pump of the embodiment, Figure 5 is an exploded view of the oil-gas mixed microlubrication pump of the embodiment. Reference Figure 3 、 Figure 4 and Figure 5 , the embodiment provides a gas-driven oil-gas mixed microlubrication pump, which comprises a pump body 1, an air inlet block 4, a driving piston assembly E, a one-way check valve assembly C, a metering piston 2 and a metering piston body 3. The pump body 1 and the air inlet block 4 are detachably connected, and the air inlet block 4 is provided with an air inlet 4a. The air inlet block 4 comprises a cavity, which is transversely penetrated and forms an air inlet F and an air outlet G at both ends, and an oil outlet cavity is longitudinally formed in the middle part. The metering piston body 3 is arranged at the bottom of the pump body 1 and abuts against the air inlet block 4. The driving piston assembly E is located inside the pump body 1 and is slidably connected along the inner wall of the pump body 1 and is sealed with the inner wall of the pump body 1 through a sealing device. The driving piston assembly E and the metering piston body 3 are connected through a reset spring 6, and an oil storage cavity A is defined between the two. The oil storage cavity A is in communication with the outside of the pump body 1. The tail of the metering piston 2 is floatingly connected in the driving piston assembly E, and the head is slidably connected in the metering piston body 3. The one-way check valve assembly C is arranged at the bottom of the metering piston body 3 and defines an oil storage cavity D with the metering piston 2. The air inlet allows the gas to enter the inside of the pump body 1 through the air inlet F, pushes the driving piston assembly E, and drives the metering piston 2 to move downward. The one-way check valve assembly C responds to the movement of the metering piston 2 to make the oil storage cavity D and the oil outlet cavity in fluid communication. The lubricating oil enters the oil storage cavity D through the oil storage cavity A, and is discharged through the air outlet G. When the gas stops entering the inside of the pump body 1, the elastic force of the reset spring 6 makes the driving piston assembly E return to the initial position (the driving piston assembly E is close to the top cover of the pump body 1).

[0042] The first air inlet B of the pump body 1 is axially arranged in the cover of the pump body 1 and radially extends out of the cover, and the second air inlet H is connected with the first air inlet B in the center of the top cover of the pump body 1 and communicates with the inside of the pump body 1, the first air inlet B communicates with the cavity of the air inlet block 4 through the through hole arranged on the air inlet block 4, and the outlet of the second air inlet H is provided with a plug screw 17.

[0043] The bottom of the pump body 1 is provided with a flange, the air inlet block 4 is provided with a mounting hole, and the air inlet block 4 is connected to the flange of the pump body 1 through the air inlet block bolt 14 and the air inlet block gasket 13. The flange is provided with a flange mounting hole and a sealing gasket 11, and the lubricating pump can be mounted in the oil tank through the flange, the sealing gasket 11 and the bolt.

[0044] The bottom of the air inlet block 4 is also provided with a first pin hole which does not communicate with the cavity or the oil outlet cavity of the air inlet block 4, the flange of the pump body 1 is provided with a second pin hole at the corresponding position, and the first pin hole and the second pin hole are provided with a spring pin 10, which plays a positioning role.

[0045] The first sealing ring 7 is arranged between the metering piston body 3 and the inner wall of the pump body 1, and the second sealing ring 9 is arranged between the bottom of the metering piston body 3 and the air inlet block 4.

[0046] The third sealing ring 8 is arranged between the inlet of the first air inlet B and the air inlet block 4.

[0047] Reference Figure 4 , Figure 5 and Figure 6 The drive piston assembly E includes a drive piston body 18, a clasp spring 16, a gas sealing ring 19 and an oil sealing ring 22 which are arranged between the drive piston body 18 and the inner wall of the pump body 1 and are spaced apart, a gas cavity is defined between the top of the drive piston body 18 and the top cover of the pump body 1, the gas sealing ring 19 is arranged to face the gas cavity, the oil sealing ring 22 is arranged to face the oil storage cavity A, the bottom of the drive piston body 18 is provided with a floating connection space for accommodating the tail of the metering piston 2, and the clasp spring 16 limits the tail of the metering piston 2 in the floating connection space.

[0048] The size of the floating connection space is designed to realize automatic centering with the metering piston body 3 when the metering piston 2 moves downward.

[0049] The lower part of the cover of the pump body 1 is provided with a first oil suction port which communicates with the oil storage cavity A, and the metering piston body 3 is provided with a second oil suction port, so that when the drive piston assembly E returns to the initial position, the oil storage cavity A communicates with the oil storage cavity D through the second oil suction port.

[0050] Reference Figure 7The one-way check valve assembly C comprises a check valve body 20, a check valve sealing ring 21, a check valve spring 15, a check valve bolt 5, and a check valve washer 12. The tail of the check valve body 20 is provided with a sealing groove, the check valve sealing ring 21 is arranged on the sealing groove, the check valve bolt 5 is screwed into the oil outlet cavity from the bottom of the air inlet block 4 through the check valve washer 12 and is screw-connected with the metering piston body 3. The head of the check valve bolt 5 is provided with a through groove, the check valve spring 15 is arranged in the through groove, and the head of the check valve body 20 is connected with the check valve bolt 5 through the check valve spring 15. When the metering piston 2 moves downward, the oil storage cavity D is communicated with the oil outlet cavity through the through groove.

[0051] With reference to Figure 3 , Figure 4 and Figure 5 , the upper structure of the oil pump is optimized, and the gas channel is only closed by a plug screw 17. The failure rate of the oil pump is greatly reduced, and the reliability of the oil pump in operation is improved. Meanwhile, the one-way check valve is also innovatively optimized.

[0052] The oil pump comprises important components such as a driving piston assembly E, a metering piston 2, a metering piston body 3, and a one-way check valve assembly C.

[0053] The oil pump functions as follows: gas enters the oil pump from the air inlet F, part of the gas flows out from the air outlet G, and part of the gas enters the inside of the oil pump through the first air inlet B and the second air inlet H to push the driving piston assembly E to move downward. The oil in the oil storage cavity D is extruded to push the one-way check valve assembly C to move downward, the lubricating oil flows into the lower passage of the oil pump and is taken away by the gas flow entering from the air inlet F, and the oil-gas mixture is transported to the position needing lubrication through the gas flow to achieve lubrication. The oil pump completes the oil discharge operation; the driving gas stops entering the oil pump, the one-way check valve assembly C rebounds under the action of the check valve spring 15, the outside passage of the oil pump is sealed with the oil storage cavity D under the action of the one-way check valve assembly C, and the discharged lubricating oil is prevented from flowing back to the inside of the oil pump. Meanwhile, the driving piston assembly E rebounds to the uppermost part of the oil pump under the action of the return spring 6, when the driving piston assembly E is reset to the initial position, the oil storage cavity D generates a negative pressure under the action of the one-way check valve assembly C, when the metering piston 2 passes the oil inlet on the metering piston body 3, the lubricating oil in the inside of the oil pump is again sucked into the oil storage cavity D under the action of the negative pressure, and preparation is made for the next lubrication. When the driving piston assembly E moves upward, a negative pressure is also generated in the oil storage cavity A in the inside of the oil pump, and the lubricating oil outside the pump body is sucked into the inside of the oil pump under the action of the negative pressure adsorption to prepare for the next stroke. The oil pump completes the reset stroke; the oil discharge stroke and the oil suction stroke are repeatedly performed to achieve the oil-gas lubrication function of the oil pump. In the embodiment, the gas is compressed air.

[0054] With reference to Figure 4 , Figure 5 andFigure 6 The drive piston assembly E abandons the design of the existing product using an integrated rubber piston, adopts a metal material as the body, separately installs a gas sealing ring 19 suitable for gas sealing on the upper section of the piston, and installs an oil sealing ring 22 suitable for lubricating oil sealing on the lower section of the piston. This design avoids the use of a sealing ring of one material for sealing different media, and fully improves the sealing performance, aging resistance and durability of the piston. The metering piston 2 is located inside the drive piston assembly E, and is limited in the installation hole inside the drive piston assembly E by a snap spring 16. However, this connection is not a steel connection, and after the installation of the metering piston 2 is completed, the tail of the metering piston 2 can float within a certain range in the drive piston assembly E. During the operation of the oil pump, the metering piston 2 and the metering piston body 3 are self-centered, avoiding the jamming phenomenon caused by the misalignment of the metering piston 2 and the metering piston body 3.

[0055] Figure 7 The one-way check valve assembly C shown is a newly designed one-way check valve assembly C, which abandons the complex structure design of the same type of product, adopts a new optimized design concept, and realizes the one-way check function through the check valve sealing ring 21, the check valve body 20, the check valve spring 15 and the fixing screw. When the metering piston 2 moves downward due to the pressure difference, the lubricating oil in the oil storage cavity D is extruded to overcome the elastic force of the check valve spring 15, and pushes the check valve body 20 downward to move downward, the oil storage cavity D is connected with the oil pump external passage, and the lubricating oil in the oil storage cavity D moves downward to the lower oil outlet cavity. When the metering piston 2 moves downward to the limit position, i.e., the drive piston assembly E contacts the metering piston body 3, the metering piston 2 stops moving downward at this time, and the check valve body 20 is reset under the action of the check valve spring 15, and the one-way check valve assembly C is reset by extruding the check valve sealing ring 21 to block the oil storage cavity D inside the metering piston body 3 from the external passage. When the compressed air stops entering the oil pump, the drive piston assembly E is reset upward under the action of the reset spring 6, at this time, a negative pressure is generated inside the oil storage cavity D in the metering piston body 3, when the end surface of the metering piston 2 exceeds the oil suction port on the metering piston body 3 during the reset process, the lubricating oil inside the oil pump is again sucked into the oil storage cavity D in the metering piston body 3 under the action of the negative pressure, preparing for the next oil supply stroke. Since the running stroke of the metering piston 2 is fixed, the amount of lubricating oil discharged by the oil pump each time also remains consistent, so this oil pump is a fixed metering, micro-lubrication oil-air mixed pump. The one-way check valve assembly C has a simple structure, low failure rate, and better compatibility with lubricating oils of different viscosities, and is easier to maintain.

[0056] The design optimizes the oil pump drive gas path, and optimizes the split oil pump body to realize the corresponding driving function through the first air inlet B and the second air inlet H. By using a plug screw 17, the Figure 2The oil pump plug assembly 42, adjusting bolt 428, sealing groove 424, sealing ring 425 and other related parts in the oil pump are replaced. The quality problems such as leakage, poor assembly and component aging caused by the cooperation of multiple parts are reduced, the cost is saved, the oil pump failure rate is reduced, and the oil pump maintenance efficiency and difficulty are improved.

[0057] The preferred embodiments of the application are described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and changes without creative work based on the concept of the present application. Therefore, any technical solutions obtained by logical analysis, reasoning or limited experiments based on the prior art according to the concept of the present application shall be within the protection scope determined by the claims.

Claims

1. A gas driven oil-air hybrid microlubrication pump, characterized in that, The pump comprises a pump body, an air inlet block, a driving piston assembly, a one-way check valve assembly, a metering piston and a metering piston body. The pump body and the air inlet block are detachably connected. An air inlet channel is formed in the cover of the pump body. The air inlet block comprises a cavity which is transversely through and forms an air inlet and an air outlet at both ends and a longitudinal oil outlet cavity in the middle. The metering piston body is arranged at the bottom of the pump body and abuts against the air inlet block. The driving piston assembly is arranged inside the pump body and is slidably connected along the inner wall of the pump body and is sealed with the inner wall of the pump body by a sealing device. The driving piston assembly and the metering piston body are connected by a return spring and define an oil storage cavity therebetween, which is in communication with the outside of the pump body. The tail of the metering piston is floatingly connected in the driving piston assembly and the head is slidably connected in the metering piston body. The one-way check valve assembly is arranged at the bottom of the metering piston body and defines an oil storage cavity with the metering piston. The air inlet channel is configured to allow gas to enter the inside of the pump body through the air inlet, push the driving piston assembly and drive the metering piston to move downward. The one-way check valve assembly is configured to respond to the movement of the metering piston to make the oil storage cavity and the oil outlet cavity in fluid communication. The oil storage cavity is configured to allow lubricating oil to enter the oil storage cavity through the oil storage cavity and be discharged through the air outlet. When the gas stops entering the inside of the pump body, the elastic force of the return spring makes the driving piston assembly return to the initial position. The air inlet channel of the pump body comprises a first air inlet channel which is axially formed in the cover of the pump body and radially extends out of the cover at the top of the cover of the pump body, and a second air inlet channel which is connected with the first air inlet channel at the center of the top of the cover of the pump body and is in communication with the inside of the pump body. The first air inlet channel is in communication with the cavity of the air inlet block through a through hole formed on the air inlet block. The outlet of the second air inlet channel is provided with a gas hole plug. The driving piston assembly comprises a driving piston body, a snap spring, a gas sealing ring and an oil sealing ring which are arranged around and spaced apart between the driving piston body and the inner wall of the pump body. The top of the driving piston body and the top cover of the pump body define a gas cavity, the gas sealing ring is arranged to face the gas cavity, and the oil sealing ring is arranged to face the oil storage cavity. The bottom of the driving piston body is provided with a floating connection space for accommodating the tail of the metering piston. The snap spring is configured to limit the tail of the metering piston in the floating connection space.

2. The gas-driven oil-gas hybrid microlubrication pump according to claim 1, wherein The bottom of the pump body has a flange, the air inlet block is provided with a mounting hole, and the air inlet block is bolted to the flange of the pump body.

3. The gas-driven oil-gas hybrid microlubrication pump according to claim 2, wherein The bottom of the air inlet block is also provided with a first pin hole which is not in communication with the cavity or the oil outlet cavity of the air inlet block. The flange of the pump body is provided with a second pin hole at the corresponding position. A spring pin is arranged in the first pin hole and the second pin hole.

4. The gas-driven oil-gas hybrid microlubrication pump according to claim 1, wherein A first sealing ring is arranged between the metering piston body and the inner wall of the pump body, and a second sealing ring is arranged between the bottom of the metering piston body and the air inlet block around the one-way check valve assembly.

5. The gas-driven oil-air hybrid microlubrication pump according to claim 1, wherein A third sealing ring is arranged between the inlet of the first air inlet channel and the air inlet block.

6. The gas-driven oil-air hybrid microlubrication pump of claim 1, wherein, The floating connection space is designed in size to realize automatic centering with the metering piston body when the metering piston moves downward.

7. The gas-driven oil-gas hybrid microlubrication pump according to claim 1, wherein A first oil suction port is formed in the lower part of the pump body shell and communicates with the oil storage cavity, and a second oil suction port is formed in the metering piston body, so that the oil storage cavity communicates with the oil storage cavity through the second oil suction port when the driving piston assembly returns to the initial position.

8. The gas-driven oil-gas hybrid microlubrication pump of claim 1, wherein, The one-way check valve assembly comprises a check valve body, a check valve sealing ring, a check valve spring, a check valve bolt and a check valve washer. The tail of the check valve body has a sealing groove, the check valve sealing ring is arranged on the sealing groove, the check valve bolt is screwed into the oil outlet cavity through the check valve washer from the bottom of the air inlet block and is screw-connected with the metering piston body. The head of the check valve bolt is provided with a through groove, the check valve spring is arranged in the through groove, the head of the check valve body is connected with the check valve bolt through the check valve spring, and the oil storage cavity communicates with the oil outlet cavity through the through groove when the metering piston moves downward.

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