High-pressure grease pump

Abstract

The utility model relates to the technical field of grease pumps, in particular to a high-pressure grease pump which comprises a pump body, the pump body is provided with a connecting port, the connecting port is provided with an oil tank, a piston is arranged in the oil tank in a sliding mode, and at least two sealing grooves are formed in the side wall of the piston. The side wall of the piston is sleeved with a first sealing ring based on the at least two sealing grooves, the cross section of the first sealing ring is in a Y shape, and the oil tank is provided with an elastic mechanism used for driving the piston to move in a matched mode. The piston lifting device has the effect of improving the sealing performance of lifting movement of the piston.

Description

Technical Field

[0001] The present application relates to the technical field of grease pumps, and in particular to a high-pressure grease pump. Background Art

[0002] High-pressure grease pumps are specialized for delivering lubricating grease and are widely used in the lubrication systems of various mechanical equipment. Their design and function are primarily to efficiently and accurately deliver the required lubricating grease to mechanical equipment, ensuring its proper operation and extending its service life. These pumps typically operate at high pressures, providing stable and reliable lubrication.

[0003] Patent publication number CN102072391A discloses a spring-loaded pressurized grease pump, comprising a transparent housing, a pressure cap, a spring, a sealing piston, and a nozzle switch. Tightening the pressure cap compresses the spring, storing energy. The spring in the stored energy state applies pressure to the sealing piston, which pushes grease through the opened nozzle into the oil channel to lubricate the lubricated object.

[0004] However, when the spring pressurizes the sealing piston, grease tends to seep out from between the sealing piston and the transparent housing, and eventually even tends to seep out of the transparent housing from the pressure cover. Utility Model Content

[0005] In order to improve the sealing performance of the piston's lifting and lowering movement, the present application provides a high-pressure grease pump.

[0006] This application provides a high-pressure grease pump, which adopts the following technical solution:

[0007] A high-pressure grease pump includes a pump body, the pump body is provided with a connecting port, the connecting port is provided with an oil tank, a piston is slidably arranged in the oil tank, the side wall of the piston is provided with at least two sealing grooves, the side wall of the piston is provided with a first sealing ring based on the at least two sealing grooves, the cross-section of the first sealing ring is Y-shaped, and the oil tank is provided with an elastic mechanism for cooperating to drive the piston to move.

[0008] By adopting the above technical solution, the piston moves up and down in the oil tank through at least two first sealing rings, and the first sealing ring with a Y-shaped cross-section relies on its open lip to stick to the coupling surface of the sealing pair. When there is no internal pressure, only a very small contact pressure is generated due to the deformation of the lip tip. In the case of sealing, there is a normal pressure equal to the medium pressure at each point in contact with the sealing medium, so the bottom of the lip ring will be subjected to axial compression, the lip will be subjected to circumferential compression, the contact with the sealing surface will become wider, and the contact stress will increase. When the internal pressure rises again, the distribution form and size of the contact pressure will change further, and the lip will fit more closely with the sealing surface, so the sealing performance is better, so that the first sealing ring has a "self-sealing effect", which is beneficial to improving the sealing performance of the piston's lifting and lowering movement.

[0009] Optionally, the oil tank includes a bottom cover, a barrel and a top cover, the bottom cover is arranged at the connecting port, the top surface of the bottom cover is provided with a first tight groove, the bottom end of the barrel is plugged into the first tight groove, the top cover is provided with a second tight groove, the top end of the barrel is plugged into the second tight groove, and the oil tank is provided with a fixing component for fixing the bottom cover, barrel and top cover.

[0010] By adopting the above technical solution, when the oil tank needs to be assembled, the bottom cover is first fixedly installed on the connection port of the pump body, and then the bottom end of the cylinder body is inserted into the first tight groove, and then the top cover is covered with the top end of the cylinder body through the second tight groove, and then the top cover, cylinder body and bottom cover are connected and fixed in sequence through the fixing assembly, which is conducive to improving the convenience of oil tank assembly.

[0011] Optionally, the fixing assembly includes a connecting rod and a nut, the side wall of the bottom cover is provided with a screw seat, the side wall of the top cover is provided with a connecting seat, and studs are respectively provided at both ends of the connecting rod, wherein the stud at one end is threadedly connected to the screw seat, and the stud at the other end passes through the connecting seat, and the nut is threadedly connected to the stud at the other end.

[0012] By adopting the above technical solution, when the fuel tank needs to be assembled, the stud at one end of the connecting rod is first threadedly connected to the screw seat, and then the stud at the other end of the connecting rod is passed through the connecting seat, and finally the nut is threadedly tightened. At this time, the top cover, the barrel and the bottom cover are fixed to each other, which is conducive to improving the disassembly of the fuel tank.

[0013] Optionally, the elastic mechanism includes a spring member, which is arranged in the oil tank, one end of the spring member is connected to the top surface of the piston, and the other end of the spring member is connected to the inner side of the top cover, and the oil tank is provided with a guide assembly for guiding the movement of the piston.

[0014] By adopting the above technical solution, when the pump body replenishes grease into the oil tank through the imported oil, under the action of the guide assembly, the grease drives the piston to move upward, and the piston squeezes the spring part. When the pump body pumps out the grease, the spring part releases the elastic force and drives the piston to move downward as the grease liquid level drops. Under the action of the spring part, it is beneficial to improve the stability of pumping grease out of the pump body.

[0015] Optionally, the guide assembly includes a guide rod, a cross frame is provided on the top surface of the bottom cover, the guide rod is arranged in the oil tank, the bottom end of the guide rod is fixedly connected to the cross frame, the top end of the guide rod slides through the piston, and the top end of the guide rod is fixedly connected to the top cover.

[0016] By adopting the above technical solution, when the piston moves up and down, the piston moves up and down along the vertical direction of the guide rod, which is beneficial to improving the stability of the piston's lifting movement.

[0017] Optionally, the spring member is a conical spring, and two conical springs are provided. The side wall sliding sleeve of the guide rod is provided with a shaft sleeve, one end of one of the conical springs is connected to the top surface of the bottom cover, and the other end of one of the conical springs is connected to the bottom surface of the shaft sleeve, one end of the other conical spring is connected to the bottom surface of the top cover, and the other end of the other conical spring is connected to the top surface of the shaft sleeve.

[0018] By adopting the above technical solution, the conical spring has stronger compressibility, which is beneficial to increasing the lifting and lowering stroke of the piston.

[0019] Optionally, a guide hole is provided through the axis of the piston, the guide rod is plugged into the guide hole, a second sealing ring is provided on the inner wall of the guide hole, and the second sealing ring is sleeved on the outer wall of the guide rod.

[0020] By adopting the above technical solution, the piston is slidably connected to the guide rod through the guide hole, and at the same time, under the action of the second sealing ring, it is beneficial to improve the sealing between the piston and the guide rod.

[0021] Optionally, the top end of the guide rod passes through the top cover, and the top end of the guide rod is threaded with a screw head.

[0022] By adopting the above technical solution, when the screw head is tightened, the guide rod is fixedly connected to the top cover. Similarly, when the screw head is loosened, the guide rod and the top cover are separated from each other, which is conducive to improving the detachability between the guide rod and the top cover.

[0023] In summary, this application has the following beneficial technical effects:

[0024] The piston moves up and down in the oil tank through at least two first sealing rings, and the first sealing ring with a Y-shaped cross-section relies on its open lip to stick to the sealing pair coupling surface. When there is no internal pressure, only a small contact pressure is generated due to the deformation of the lip tip. In the case of sealing, there is a normal pressure equal to the medium pressure at each point in contact with the sealing medium, so the bottom of the lip ring will be subjected to axial compression, and the lip will be subjected to circumferential compression, and the contact with the sealing surface will become wider. At the same time, the contact stress increases. When the internal pressure rises again, the distribution form and size of the contact pressure will change further, and the lip will fit more closely with the sealing surface, so the sealing is better, so that the first sealing ring has a "self-sealing effect", which is beneficial to improving the sealing of the piston's lifting and lowering movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the high-pressure grease pump of the present application;

[0026] Figure 2 is a cross-sectional view of the high-pressure grease pump of the present application;

[0027] Figure 3 yes Figure 2 An enlarged view of part A;

[0028] Figure 4 It is a schematic diagram of the overall structure of the fuel tank of the present application;

[0029] Figure 5 It is a structural schematic diagram of the piston of this application.

[0030] Explanation of the accompanying reference numerals: 1. Pump body; 2. Connecting port; 3. Oil tank; 4. Piston; 5. Sealing groove; 6. First sealing ring; 7. Bottom cover; 8. Cylinder body; 9. Top cover; 10. First tight groove; 11. Second tight groove; 12. Sealing gasket; 13. Connecting rod; 14. Nut; 15. Screw seat; 16. Connecting seat; 17. Stud; 18. Conical spring; 19. Bushing; 20. Guide rod; 21. Cross frame; 22. Guide hole; 23. Second sealing ring; 24. Screw head. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-5 This application is described in further detail.

[0032] Example:

[0033] See also Figure 1-Figure 3A high-pressure grease pump comprises a pump body 1. The pump body 1 is provided with a connection port 2, and the pump body 1 is provided with an oil tank 3 through the connection port 2. The oil tank 3 is used to store grease, and a piston 4 is slidably installed in the oil tank 3. The piston 4 is disc-shaped, and the top surface of the piston 4 is concave. A sealing groove 5 is provided on the outer wall of the piston 4, and the number of the sealing grooves 5 is at least two. In this embodiment, there are two sealing grooves 5, and the two sealing grooves 5 are spaced apart along the vertical direction of the piston 4. The piston 4 is provided with a first sealing ring 6 based on the two sealing grooves 5, and the cross-section of the first sealing ring 6 is Y-shaped. The oil tank 3 is provided with an elastic mechanism, which is used to drive the piston 4 to move up and down in the oil tank 3.

[0034] The two first sealing rings 6 work together to enhance the seal between the piston 4 and the inner wall of the barrel 8. In the prior art, the first sealing ring 6, with its Y-shaped cross-section, adheres to the sealing pair's mating surface with its open lip. When there's no internal pressure, only the deformation of the lip tip generates minimal contact pressure. When sealed, every point in contact with the sealing medium experiences a normal pressure equal to the medium's pressure. This results in axial compression at the bottom of the lip ring and circumferential compression at the lip, widening the contact surface and increasing contact stress. As internal pressure rises further, the distribution and magnitude of the contact pressure change further, tightening the lip's fit with the sealing surface and improving sealing performance. This is the "self-sealing effect" of the Y-ring. Thanks to this self-sealing effect, a single Y-ring can effectively seal against high pressures of up to 32 MPa.

[0035] See also Figure 2 and Figure 4 To facilitate assembly of the fuel tank 3, the fuel tank 3 comprises a bottom cover 7, a barrel 8, and a top cover 9. The bottom cover 7 is bolted to the connection port 2 of the pump body 1. A first tight-fitting groove 10 is defined on the top surface of the bottom cover 7, while a second tight-fitting groove 11 is defined on the bottom surface of the top cover 9. The barrel 8 is vertically arranged, with the bottom end of the barrel 8 tightly fitting into the first tight-fitting groove 10 and the top end of the barrel 8 tightly fitting into the second tight-fitting groove 11.

[0036] It should be noted that in order to further improve the sealing between the barrel 8 and the bottom cover 7 and the top cover 9 respectively, sealing gaskets 12 are installed at the bottom of the first tight groove 10 and the second tight groove 11.

[0037] See also Figure 4In order to further connect and fix the bottom cover 7, the barrel 8 and the top cover 9, the fuel tank 3 is equipped with a fixing assembly, which includes a connecting rod 13 and a nut 14. The side wall of the bottom cover 7 is fixedly connected with a screw seat 15, and there are four screw seats 15. The four screw seats 15 are distributed in a circular array along the vertical central axis direction of the bottom cover 7. The side wall of the top cover 9 is fixedly connected with a connecting seat 16, and the number of the connecting seats 16 is the same as the number of the screw seats 15. There are also four connecting rods 13, and the two ends of the connecting rod 13 are coaxially fixed with studs 17, and the stud 17 at one end is threadedly connected to the screw seat 15, and the stud 17 at the other end passes through the connecting seat 16 and extends above the connecting seat 16. The nut 14 is threadedly connected to the stud 17 at the other end.

[0038] When the fuel tank 3 needs to be assembled and secured to the connection port 2 of the pump body 1, first secure the bottom cover 7 to the connection port 2 using bolts. The bottom end of the barrel 8 is then tightly inserted into the first tight groove 10, and the top cover 9 is then secured to the top of the barrel 8 via the second tight groove 11. During this process, ensure that the connection seat 16 and the screw seat 15 are aligned. The connecting rod 13 is then passed through the connecting seat 16, and the stud 17 at the bottom end of the connecting rod 13 is threadedly connected to the screw seat 15, with the stud 17 at the top end of the connecting rod 13 extending above the connecting seat 16. Finally, the nut 14 is screwed in, securing the top cover 9, barrel 8, and bottom cover 7 to one another.

[0039] For details, see Figure 2 The elastic mechanism includes a spring member. The spring member is installed in the oil tank 3. In this embodiment, the spring member is a conical spring 18, and there are two conical springs 18. The two conical springs 18 are arranged in an upper and lower position opposite each other, with a shaft sleeve 19 inserted between the two conical springs 18. One end of the lower conical spring 18 is fixedly connected to the bottom surface of the shaft sleeve 19, and the other end of the lower conical spring 18 is fixedly connected to the inner concave surface of the piston 4. One end of the upper conical spring 18 is fixedly connected to the bottom surface of the top cover 9, and the other end of the upper conical spring 18 is fixedly connected to the top surface of the shaft sleeve 19.

[0040] See also Figure 2 To further enhance the stability of the conical spring 18 during extrusion deformation and the piston 4 during lifting and lowering, a guide assembly is installed in the oil tank 3. This guide assembly includes a guide rod 20. A cross frame 21 is bolted to the top surface of the bottom cover 7. The guide rod 20 is vertically arranged, with its bottom end fixedly connected to the center of the cross frame 21. The top end of the guide rod 20 passes through the piston 4 and is fixedly connected to the top cover 9. A bushing 19 is slidably mounted on the guide rod 20.

[0041] As the piston 4 rises with the grease level, guided by the guide rod 20, it simultaneously squeezes the two conical springs 18. As the pump body 1 pumps grease from the oil tank 3, the grease level drops, releasing the elastic force of the conical springs 18 and driving the piston 4 downward, keeping it in contact with the grease level.

[0042] It should be noted that the conical spring 18 has strong compressibility, thereby facilitating an increase in the lifting and lowering stroke of the piston 4 in the oil tank 3 .

[0043] See also Figure 2 and Figure 5 To improve the sealing between the piston 4 and the guide rod 20, a guide hole 22 is formed through the axis of the piston 4. The piston 4 is slidably connected to the guide rod 20 through the guide hole 22. A second sealing ring 23 is fixedly embedded in the inner wall of the guide hole 22. The second sealing ring 23 is provided with two rings, both of which are tightly fitted on the outer wall of the guide rod 20.

[0044] See also Figure 2 In order to improve the detachability between the guide rod 20 and the top cover 9, the top end of the guide rod 20 passes through the top cover 9 and extends above the top cover 9. The top end of the guide rod 20 is threadedly connected with a screw head 24.

[0045] When the top cover 9 covers the top of the barrel 8, the top end of the guide rod 20 penetrates and is inserted into the top of the top cover 9. When the screw head 24 is tightened, the guide rod 20 is fixedly connected to the top cover 9. When the screw head 24 is loosened, the guide rod 20 and the top cover 9 are separated from each other.

[0046] The working principle of a high-pressure grease pump:

[0047] When the fuel tank 3 needs to be assembled and secured to the connection port 2 of the pump body 1, first secure the bottom cover 7 to the connection port 2 using bolts. The bottom end of the barrel 8 is then tightly inserted into the first tight groove 10, and the top cover 9 is then secured to the top of the barrel 8 via the second tight groove 11. During this process, ensure that the connection seat 16 and the screw seat 15 are aligned. The connecting rod 13 is then passed through the connecting seat 16, and the stud 17 at the bottom end of the connecting rod 13 is threadedly connected to the screw seat 15, with the stud 17 at the top end of the connecting rod 13 extending above the connecting seat 16. Finally, the nut 14 is screwed in, securing the top cover 9, barrel 8, and bottom cover 7 to one another.

[0048] As the piston 4 rises with the grease level, guided by the guide rod 20, it simultaneously compresses the two conical springs 18. As the pump body 1 pumps grease from the oil tank 3, the grease level drops, releasing the elastic force of the conical springs 18 and driving the piston 4 downward, maintaining contact with the grease level. As the piston 4 rises and falls, the two Y-shaped first sealing rings 6 press against the inner wall of the cylinder body 8, maintaining a tight seal between the piston 4 and the inner wall of the cylinder body 8.

[0049] In summary, the first sealing ring 6 plays a "self-sealing role", which is beneficial to improving the sealing performance of the piston 4 when it moves up and down.

[0050] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A high-pressure grease pump, comprising a pump body (1), characterized in that: The pump body (1) is provided with a connection port (2), the connection port (2) is provided with an oil tank (3), a piston (4) is slidably provided in the oil tank (3), a side wall of the piston (4) is provided with at least two sealing grooves (5), the side wall of the piston (4) is provided with a first sealing ring (6) based on the at least two sealing grooves (5), the cross section of the first sealing ring (6) is Y-shaped, and the oil tank (3) is provided with an elastic mechanism for cooperating to drive the piston (4) to move; The oil tank (3) comprises a bottom cover (7), a barrel (8) and a top cover (9); the bottom cover (7) is arranged at the connecting port (2); a first tight groove (10) is provided on the top surface of the bottom cover (7); the bottom end of the barrel (8) is plugged into the first tight groove (10); the top cover (9) is provided with a second tight groove (11); the top end of the barrel (8) is plugged into the second tight groove (11); the oil tank (3) is provided with a fixing assembly for fixing the bottom cover (7), the barrel (8) and the top cover (9); The elastic mechanism includes a spring member, which is arranged in the oil tank (3), one end of the spring member is connected to the top surface of the piston (4), and the other end of the spring member is connected to the inner side of the top cover (9), and the oil tank (3) is provided with a guide assembly for guiding the movement of the piston (4); The guide assembly includes a guide rod (20), a cross frame (21) is provided on the top surface of the bottom cover (7), the guide rod (20) is arranged in the oil tank (3), the bottom end of the guide rod (20) is fixedly connected to the cross frame (21), the top end of the guide rod (20) slides through the piston (4), and the top end of the guide rod (20) is fixedly connected to the top cover (9); A guide hole (22) is provided through the axis of the piston (4), the guide rod (20) is plugged into the guide hole (22), a second sealing ring (23) is provided on the inner wall of the guide hole (22), and the second sealing ring (23) is sleeved on the outer wall of the guide rod (20).

2. A high-pressure grease pump according to claim 1, characterized in that: The fixing assembly includes a connecting rod (13) and a nut (14), a screw seat (15) is provided on the side wall of the bottom cover (7), a connecting seat (16) is provided on the side wall of the top cover (9), and studs (17) are respectively provided at both ends of the connecting rod (13), wherein the stud (17) at one end is threadedly connected to the screw seat (15), and the stud (17) at the other end passes through the connecting seat (16), and the nut (14) is threadedly connected to the stud (17) at the other end.

3. A high-pressure grease pump according to claim 1, characterized in that: The spring member is a conical spring (18), two of which are provided. The side wall sliding sleeve of the guide rod (20) is provided with a shaft sleeve (19), one end of one of the conical springs (18) is connected to the top surface of the bottom cover (7), the other end of one of the conical springs (18) is connected to the bottom surface of the shaft sleeve (19), one end of another conical spring (18) is connected to the bottom surface of the top cover (9), and the other end of the other conical spring (18) is connected to the top surface of the shaft sleeve (19).

4. A high-pressure grease pump according to claim 1, characterized in that: The top end of the guide rod (20) passes through the top cover (9), and the top end of the guide rod (20) is threadedly provided with a screw head (24).

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