Plunger pump

Abstract

The invention discloses a plunger pump and relates to the technical field of power conveying equipment, the plunger pump comprises a pump shell and an eccentric shaft, the eccentric shaft is arranged in the pump shell and comprises an eccentric part, the pump shell and the eccentric part define an oil suction cavity and an oil discharge cavity, gaskets are arranged on the two end faces of the eccentric part, and an oil storage groove is formed in the surface, opposite to the gaskets, of the pump shell; and the oil storage tank is communicated with the oil suction cavity or the oil discharge cavity. Thus, oil in the oil suction cavity or the oil discharge cavity can be filled in the oil storage groove, and the oil in the oil storage groove can lubricate the gasket and the surface, opposite to the gasket, of the pump shell, so that the risk that the gasket and the surface, opposite to the gasket, of the pump shell are abraded in the rotating process of the eccentric shaft can be effectively reduced; and therefore, the reliability of the plunger pump can be effectively improved, and the service life of the plunger pump is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of power transmission equipment, and in particular to a plunger pump. Background Art

[0002] The plunger pump mainly rotates the eccentric shaft in the pump housing, and the various components cooperate with each other under the action of the eccentric shaft to achieve oil suction and discharge. In the related art, a gasket is usually arranged on the end face of the eccentric part of the eccentric shaft to reduce the wear of the eccentric part.

[0003] However, when the eccentric shaft rotates at a high speed, the gasket and the contact surface of the pump casing with the gasket are also at risk of wear, thereby reducing the reliability of the plunger pump. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a plunger pump.

[0005] The present application provides a plunger pump, which includes a pump housing and an eccentric shaft. The eccentric shaft is arranged in the pump housing, and the eccentric shaft includes an eccentric part. The pump housing and the eccentric part are combined to form an oil suction chamber and an oil discharge chamber. Gaskets are arranged on both end surfaces of the eccentric part. An oil storage tank is arranged on the surface of the pump housing opposite to the gasket, and the oil storage tank is connected to the oil suction chamber or the oil discharge chamber.

[0006] In some embodiments of the present application, the pump casing includes a shell and a front cover connected to each other, a valve plate is provided at one end of the shell facing the front cover, the valve plate and the shell together form an oil outlet chamber, a first eccentric shaft seat is provided on the side of the valve plate facing the front cover, the first eccentric shaft seat, the front cover and the eccentric part together form the oil suction chamber and the oil discharge chamber, a first axial hole is provided in the first eccentric shaft seat, the first end of the eccentric shaft is rotatably provided in the first axial hole, the first end face of the eccentric part is opposite to the first eccentric shaft seat, the gasket includes a first gasket arranged between the first end face and the first eccentric shaft seat, and the oil storage tank includes a first oil storage tank arranged on the first surface of the first eccentric shaft seat facing the first gasket.

[0007] In some embodiments of the present application, the first eccentric shaft seat also includes an outer peripheral surface connected to the first surface, the first oil storage tank is recessed inward from the first surface, and along the radial direction of the first eccentric shaft seat, the first end of the first oil storage tank passes through the outer peripheral surface, and the second end of the first oil storage tank is connected to the first shaft hole.

[0008] In some embodiments of the present application, the depth of the first oil storage tank gradually increases from the first end of the oil storage tank to the second end of the oil storage tank.

[0009] In some embodiments of the present application, a projection of the first gasket on the first surface partially overlaps with a projection of the first oil storage tank on the first surface.

[0010] In some embodiments of the present application, the front cover includes a connected side wall and a bottom wall, a plurality of plunger assemblies are arranged on the side wall, an outer peripheral surface of the first eccentric shaft seat is abutted against the side wall, a second eccentric shaft seat is arranged on the bottom wall, a second eccentric shaft seat is arranged in the second eccentric shaft seat, a second axial hole is arranged in the second eccentric shaft seat, the second end face of the eccentric portion is opposite to the second eccentric shaft seat, the gasket also includes a second gasket arranged between the second end face and the second eccentric shaft seat, and the oil storage tank also includes a second oil storage tank arranged on the second surface of the second eccentric shaft seat facing the second gasket.

[0011] In some embodiments of the present application, the second oil storage tank is recessed inward from the second surface and is connected to the second axial hole.

[0012] In some embodiments of the present application, a projection of the second gasket on the second surface partially overlaps with a projection of the second oil storage tank on the second surface.

[0013] In some embodiments of the present application, the second axial hole is a stepped hole, the large diameter section of the stepped hole is located on the side of the small diameter section away from the eccentric portion, and the plunger pump also includes: an oil seal structure, which is arranged in the large diameter section to achieve sealing between the second end of the eccentric shaft and the front cover.

[0014] In some embodiments of the present application, the front cover is provided with a pressure relief channel, one end of the pressure relief channel is connected to the second oil storage tank, and the other end of the pressure relief channel is connected to the large diameter section.

[0015] The plunger pump provided in this application can achieve the following beneficial technical effects:

[0016] The plunger pump provided by the present application has an eccentric shaft arranged in a pump casing, and the pump casing and the eccentric portion of the eccentric shaft are combined to form an oil suction chamber and an oil discharge chamber. Gaskets are arranged on both end surfaces of the eccentric portion to reduce the wear of the eccentric portion caused by the eccentric shaft during rotation. An oil storage tank is arranged on the surface of the pump casing opposite to the gasket, and the oil storage tank is connected to the oil suction chamber or the oil discharge chamber. In this way, the oil in the oil suction chamber or the oil discharge chamber will be filled in the oil storage tank, and the oil in the oil storage tank will lubricate the gasket and the surface of the pump casing opposite to the gasket, thereby effectively reducing the risk of wear on the gasket and the surface of the pump casing opposite to the gasket during rotation of the eccentric shaft, thereby effectively improving the reliability of the plunger pump and extending the service life of the plunger pump.

[0017] Other characteristic features and advantages of the present application will become apparent from the following description of exemplary embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings incorporated into the specification and constituting a part of the specification illustrate embodiments of the present application and are used together with the description to explain the principles of the present application. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present application, rather than all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a schematic structural diagram of a plunger pump according to an exemplary embodiment;

[0020] Figure 2 is a schematic structural diagram of a housing according to an exemplary embodiment;

[0021] Figure 3 yes Figure 2 Sectional view along AA direction;

[0022] Figure 4 is a schematic structural diagram of a plunger pump according to another exemplary embodiment;

[0023] Figure 5 yes Figure 4 Cross-sectional view along the BB direction;

[0024] Figure 6 is a schematic structural diagram of a plunger assembly according to an exemplary embodiment;

[0025] Figure 7 yes Figure 6 Sectional view along CC direction;

[0026] Figure 8 is a structural schematic diagram of an oil seal structure according to an exemplary embodiment;

[0027] Fig. 9 yes Figure 8 Cross-sectional view along DD direction.

[0028] Reference numerals:

[0029] 1. Plunger pump;

[0030] 10. Shell; 11. Liquid inlet; 12. Liquid outlet; 13. Oil inlet chamber; 14. Oil outlet chamber; 15. Valve plate; 16. First eccentric shaft seat; 161. First oil storage tank; 17. First gasket; 18. First shaft hole;

[0031] 20, front cover; 21, bottom wall; 22, side wall; 23, second eccentric shaft seat; 231, second oil storage tank; 24, second gasket; 25, pressure relief channel; 26, second shaft hole; 261, large diameter section; 262, small diameter section; 27, oil drain hole; 28, plunger hole;

[0032] 30. plunger assembly; 31. plunger; 311. working chamber; 312. oil inlet hole; 32. return spring; 33. threaded plug; 331. end cover; 3311. limiting groove; 34. support seat; 341. head; 3411. outer end surface; 342. rod; 35. limiting structure; 351. first matching part; 352. second matching part;

[0033] 40. eccentric shaft; 41. gap; 42. eccentric portion; 43. sleeve; 44. bushing;

[0034] 50. First valve body assembly; 51. One-way valve seat; 511. Through hole; 52. One-way valve spring; 53. One-way valve cover; 54. One-way valve body; 541. Oil outlet hole;

[0035] 60. Second valve body assembly; 61. Safety valve seat; 611. Inner cavity; 612. Second through hole; 62. Safety valve spring; 63. Spherical plugging member; 64. Support structure; 641. Connecting part; 642. Support part; 643. Guide hole; 65. Fixing structure; 651. First through hole;

[0036] 70. Oil seal structure; 71. Skeleton ring; 72. Elastic layer; 73. First sealing lip; 74. Second sealing lip; 75. Elastic member. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily.

[0038] The plunger pump mainly rotates the eccentric shaft in the pump housing, and the various components cooperate with each other under the action of the eccentric shaft to achieve oil suction and discharge. In the related art, a gasket is usually arranged on the end face of the eccentric part of the eccentric shaft to reduce the wear of the eccentric part.

[0039] Exemplarily, the plunger pump in the related art includes a pump housing and an eccentric shaft arranged in the pump housing, the pump housing includes a housing and a front cover connected to each other, a first eccentric shaft seat is arranged on the front cover, a second eccentric shaft seat is arranged on the housing, the first end of the eccentric shaft is rotatably arranged in the axial hole of the first eccentric shaft seat, and the second end of the eccentric shaft is rotatably arranged in the axial hole of the second eccentric shaft seat. The eccentric part includes a first end face facing the first eccentric shaft seat and a second end face facing the second eccentric shaft seat. During the rotation of the eccentric shaft, contact friction is easily generated between the first end face and the first eccentric shaft seat, and between the second end face and the second eccentric shaft seat, thereby shortening the service life of the eccentric part due to wear. Based on this, the related art usually arranges eccentricity between the first end face and the first eccentric shaft seat and between the second end face and the second eccentric shaft seat to reduce the wear on the eccentric part.

[0040] However, when the eccentric shaft rotates at a high speed, the gasket and the contact surface of the pump casing with the gasket are also at risk of wear, thereby reducing the reliability of the plunger pump.

[0041] In order to solve the above problems, the present application provides a plunger pump, wherein an eccentric shaft is arranged in a pump casing, and the pump casing and the eccentric part of the eccentric shaft are combined to form an oil suction chamber and an oil discharge chamber, and gaskets are arranged on both end surfaces of the eccentric part to reduce the wear of the eccentric part caused by the eccentric shaft during rotation. An oil storage tank is arranged on the surface of the pump casing opposite to the gasket, and the oil storage tank is connected to the oil suction chamber or the oil discharge chamber. In this way, the oil in the oil suction chamber or the oil discharge chamber will be filled in the oil storage tank, and the oil in the oil storage tank will lubricate the gasket and the surface of the pump casing opposite to the gasket, thereby effectively reducing the risk of wear on the gasket and the surface of the pump casing opposite to the gasket during rotation of the eccentric shaft, thereby effectively improving the reliability of the plunger pump and extending the service life of the plunger pump.

[0042] The plunger pump provided according to the present application is described in detail below in conjunction with the accompanying drawings.

[0043] An exemplary embodiment of the present application provides a plunger pump, such as Figure 1 As shown, the plunger pump 1 includes a pump housing and an eccentric shaft 40, and the eccentric shaft 40 is arranged in the pump housing. Figure 4 and Figure 5As shown, the eccentric shaft 40 includes an eccentric portion 42, and gaskets are arranged on both end surfaces of the eccentric portion 42 to reduce the wear on the eccentric portion 42 during the rotation of the eccentric shaft 40. The pump housing and the eccentric portion 42 enclose an oil suction chamber and an oil discharge chamber, and an oil storage tank is arranged on the surface of the pump housing opposite to the gasket, and the oil storage tank is connected to the oil suction chamber or the oil discharge chamber. With such a setting, the oil in the oil suction chamber or the oil discharge chamber will be filled in the oil storage tank, and the oil in the oil storage tank will lubricate the gasket and the surface of the pump housing opposite to the gasket, thereby effectively reducing the risk of wear on the gasket and the surface of the pump housing opposite to the gasket during the rotation of the eccentric shaft 40, thereby effectively improving the reliability of the plunger pump 1 and extending the service life of the plunger pump 1.

[0044] like Figure 5 As shown, in one embodiment, the eccentric shaft 40 also includes a sleeve 43 and a bushing 44, the sleeve 43 is sleeved on the eccentric part 42, and the bushing 44 is sleeved between the sleeve 43 and the eccentric part 42. The outer peripheral surface of the sleeve 43 abuts against the blocking end of each plunger 31, and the sleeve 43 can relieve overload and reduce vibration and noise. The bushing 44 is used to reduce the friction and wear between the eccentric part 42 and the sleeve 43. The material of at least one of the eccentric part 42, the sleeve 43 and the bushing 44 is tin bronze, and its tensile strength is 290MPa to 300MPa, for example, 295MPa, and the elongation is 9% to 11%, for example, 10%. Since the tin bronze material contains a large amount of tin element, it can effectively improve the wear resistance, structural strength and corrosion resistance of the eccentric shaft 40, thereby improving the reliability of the plunger pump 1.

[0045] In one embodiment, the bushing 44 includes a plurality of structural layers stacked in sequence. Exemplarily, the multi-layer structure may be, for example, 2 layers, 3 layers or more than 3 layers. One structural layer in the multi-layer structural layer close to the shaft sleeve 43 includes a steel structural member, and the steel structural member is made of, for example, a low-carbon cold-rolled steel plate. With such a design, on the one hand, the use of steel material to prepare a structural layer of the bushing 44 instead of using copper material to prepare the bushing 44 can effectively reduce production costs. On the other hand, compared with copper materials, steel structural members have higher structural strength, rigidity and wear resistance, and thus a structural layer of the bushing 44 close to the shaft sleeve 43 is a steel structural member, which can effectively improve the structural strength, rigidity and wear resistance of the bushing 44, thereby effectively improving the reliability of the eccentric shaft 40.

[0046] Another structural layer in the multi-layer structural layer near the eccentric portion 42 includes a colloid structural member. For example, the colloid structural member can be made of polytetrafluoroethylene resin, because the polytetrafluoroethylene resin material has strong high temperature resistance and low temperature resistance, for example, it can withstand working temperatures of -196°C to 250°C, so as to avoid deformation of the bushing 44 due to the high or low temperature of the working environment, which affects the normal operation of the eccentric shaft 40.

[0047] Such a configuration can effectively reduce the friction damage between the eccentric portion 42 and the bushing 44 , thereby further improving the reliability of the eccentric shaft 40 and extending the service life of the eccentric shaft 40 .

[0048] In one embodiment, the bushing 44 and the shaft sleeve 43 are interference fit. For example, a press-fitting device is used to press the bushing 44 into the shaft sleeve 43 by a hydraulic press, so as to achieve an interference fit between the bushing 44 and the shaft sleeve 43, so that the bushing 44 is fixedly connected to the shaft sleeve 43. By making the bushing 44 and the shaft sleeve 43 have an interference fit, the tightness of the connection between the bushing 44 and the shaft sleeve 43 can be effectively improved, thereby effectively avoiding wear and offset between the shaft sleeve 43 and the bushing 44 during the operation of the eccentric shaft 40, and further improving the working stability and reliability of the eccentric shaft 40.

[0049] The bushing 44 is matched with the gap 41 of the eccentric part 42. With such a setting, on the one hand, the gap 41 between the bushing 44 and the eccentric part 42 provides a deformation space for the slight deformation of the eccentric part 42 during the operation of the eccentric shaft 40, such as thermal deformation when the eccentric part 42 is heated, thereby effectively avoiding the bushing 44 from being damaged due to the deformation of the eccentric part 42 during the operation of the eccentric shaft 40, thereby effectively improving the reliability of the eccentric shaft 40. On the other hand, the gap 41 between the bushing 44 and the eccentric part 42 can also provide a lubrication space between the bushing 44 and the eccentric part 42, effectively reducing the wear between the two, thereby further improving the reliability of the eccentric shaft 40 and extending the service life of the eccentric shaft 40.

[0050] In some embodiments, the gap 41 between the bushing 44 and the eccentric portion 42 is 0.02 mm to 0.06 mm, for example, 0.04 mm. Such a design avoids the gap 41 being too large to cause additional impact loads affecting the normal operation of the plunger pump 1, and avoids the gap 41 being too small to cause excessive wear between the bushing 44 and the eccentric portion 42 to cause heat, thereby ensuring the normal operation of the eccentric portion 42 while improving the reliability of the eccentric shaft 40.

[0051] In one embodiment, the multi-layer structural layer includes a first structural layer, a second structural layer and a third structural layer sandwiched between the first structural layer and the second structural layer. The first structural layer has an interference fit with the sleeve 43, and the second structural layer has a gap 41 with the eccentric portion 42. The first structural layer includes a steel structural part, the second structural layer includes a rubber structural part, and the third structural layer includes a tin bronze structural part.

[0052] By setting up three structural layers, the structural strength of the eccentric shaft 40 is ensured, which not only facilitates processing, but also saves the use of materials, thereby further reducing production costs. Since the tin bronze material contains a large amount of tin, the third structural layer is a tin bronze structural part, which can effectively improve the wear resistance, structural strength and corrosion resistance of the eccentric shaft 40, thereby further improving the reliability of the eccentric shaft 40.

[0053] like Figure 2 , Figure 3 and 5 As shown, in one embodiment, the pump housing includes a housing 10 and a front cover 20 connected to each other, and a valve plate 15 is provided at one end of the housing 10 facing the front cover 20, and the valve plate 15 and the housing 10 enclose an oil outlet chamber 14. A first eccentric shaft seat 16 is provided at one side of the valve plate 15 facing the front cover 20, and the first eccentric shaft seat 16 and the valve plate 15 enclose an oil inlet chamber 13, and the oil inlet chamber 13 and the oil outlet chamber 14 are not connected.

[0054] The first eccentric shaft seat 16, the front cover 20 and the eccentric portion 42 enclose an oil suction chamber and an oil discharge chamber. A first axial hole 18 is provided in the first eccentric shaft seat 16. The first end of the eccentric shaft 40 is rotatably provided in the first axial hole 18. The first end face of the eccentric portion 42 is opposite to the first eccentric shaft seat 16.

[0055] The gasket includes a first gasket 17 disposed between the first end face and the first eccentric shaft seat 16. By disposing the first gasket 17, the wear between the first end face and the first eccentric shaft seat 16 caused during the rotation of the eccentric shaft 40 can be reduced. The oil storage tank includes a first oil storage tank 161 disposed on the first surface of the first eccentric shaft seat 16 facing the first gasket 17. During the operation of the plunger pump 1, the oil in the oil inlet chamber 13 enters the oil suction chamber and the oil discharge chamber, and then fills the first oil storage tank 161. The oil in the first oil storage tank 161 lubricates the first gasket 17 and the first surface of the first eccentric shaft seat 16, thereby effectively reducing the risk of wear on the first gasket 17 and the first surface of the first eccentric shaft seat 16 during the rotation of the eccentric shaft 40, thereby effectively improving the reliability of the plunger pump 1 and extending the service life of the plunger pump 1.

[0056] like Figure 3As shown, in one embodiment, the first eccentric shaft seat 16 also includes an outer peripheral surface connected to the first surface, and the first oil storage tank 161 is recessed inward from the first surface. Along the radial direction of the first eccentric shaft seat 16, the first end of the first oil storage tank 161 penetrates the outer peripheral surface, and the second end of the first oil storage tank 161 is connected to the first shaft hole 18. With such a setting form, on the one hand, the comprehensiveness of lubrication of the first surface of the first gasket 17 and the first eccentric shaft 40 can be effectively improved, thereby further reducing the risk of wear of the first gasket 17 and the first surface of the first eccentric shaft seat 16, and further improving the reliability of the plunger pump 1. On the other hand, the oil in the first oil storage tank 161 can also enter the first shaft hole 18, and then lubricate the first end of the eccentric shaft 40, thereby improving the smoothness of the rotation of the eccentric shaft 40, thereby not only improving the working efficiency of the plunger pump 1, but also further improving the reliability of the plunger pump 1.

[0057] Continue to refer Figure 3 In one embodiment, the depth of the first oil storage tank 161 gradually increases from the first end of the oil storage tank to the second end of the oil storage tank. Such a design can, on the one hand, effectively ensure that there is enough oil for lubrication under the cover of the first gasket 17, thereby further improving the lubrication effect. On the other hand, it can also increase the amount of oil entering the first shaft hole 18, thereby further lubricating the first end of the eccentric shaft 40 and improving the smoothness of the rotation of the eccentric shaft 40.

[0058] In one embodiment, the projection of the first gasket 17 on the first surface partially overlaps with the projection of the first oil storage tank 161 on the first surface. It should be noted that the first gasket 17 is a circular ring structure, which includes an outer circumference and an inner circumference. The projection of the first gasket 17 on the first surface partially overlaps with the projection of the first oil storage tank 161 on the first surface, which means that the length of the first oil storage tank 161 is greater than the distance between the outer circumference of the first gasket 17 and the inner circumference of the first gasket 17. The length of the first oil storage tank 161 refers to the length of the first oil storage tank 161 extending along the radial direction of the housing 10. In this way, the lubrication effect of the first gasket 17 can be further improved.

[0059] like Figure 5As shown, in one embodiment, the front cover 20 includes a connected side wall 22 and a bottom wall 21, and a plurality of plunger holes 28 are provided on the side wall 22, for example, 6, 7 or 8. Each plunger hole 28 extends in the radial direction of the front cover 20, and a plunger assembly 30 is provided in each plunger hole 28. A second eccentric shaft seat 23 is provided on the bottom wall 21, and a second shaft hole 26 is provided in the second eccentric shaft seat 23, and the second end surface of the eccentric portion 42 is opposite to the second eccentric shaft seat 23. A gap 41 is formed between the outer peripheral surface of the eccentric portion 42 and the side wall 22 of the front cover 20, and the gap 41 constitutes an oil suction chamber or an oil discharge chamber. The outer peripheral surface of the first eccentric shaft seat 16 abuts against the side wall 22, and a through hole is provided on the first eccentric shaft seat 16 to connect the oil inlet chamber 13 with the gap 41.

[0060] The gasket also includes a second gasket 24 disposed between the second end face and the second eccentric shaft seat 23. By disposing the second gasket 24, the wear between the second end face and the second eccentric shaft seat 23 caused during the rotation of the eccentric shaft 40 can be reduced. The oil storage tank also includes a second oil storage tank 231 disposed on the second surface of the second eccentric shaft seat 23 facing the second gasket 24. During the operation of the plunger pump 1, the oil in the oil inlet chamber 13 will enter the oil suction chamber and the oil discharge chamber, and then fill the second oil storage tank 231. The oil in the second oil storage tank 231 will lubricate the second surface of the second gasket 24 and the second eccentric shaft seat 23, thereby effectively reducing the risk of wear on the second surface of the second gasket 24 and the second eccentric shaft seat 23 during the rotation of the eccentric shaft 40, thereby effectively improving the reliability of the plunger pump 1 and extending the service life of the plunger pump 1.

[0061] In one embodiment, the second oil storage tank 231 is recessed inward from the second surface and communicates with the second shaft hole 26. With such a configuration, not only can the second gasket 24 and the second end surface of the second eccentric shaft seat 23 be lubricated, but the oil in the second oil storage tank 231 can also enter the second shaft hole 26, thereby lubricating the second end of the eccentric shaft 40, improving the smoothness of the rotation of the eccentric shaft 40, thereby not only improving the working efficiency of the plunger pump 1, but also further improving the reliability of the plunger pump 1.

[0062] In one embodiment, the projection of the second gasket 24 on the second surface partially overlaps with the projection of the second oil storage tank 231 on the second surface. It should be noted that the second gasket 24 is also a circular ring structure, which includes an outer circumference and an inner circumference. The projection of the second gasket 24 on the second surface partially overlaps with the projection of the second oil storage tank 231 on the second surface, which means that the length of the second oil storage tank 231 is greater than the distance between the outer circumference of the second gasket 24 and the inner circumference of the second gasket 24. The length of the second oil storage tank 231 refers to the length of the second oil storage tank 231 extending along the radial direction of the front cover 20. In this way, the lubrication effect of the second gasket 24 can be further improved.

[0063] like Figure 6 and Figure 7 As shown, in one embodiment, the plunger assembly 30 includes a threaded plug 33, a support seat 34, and a plunger 31 supported on the support seat 34 by a return spring 32. The plunger 31 is a sleeve structure with one end blocked, and an oil inlet hole 312 is provided on the cylinder wall of the sleeve structure. For example, only one oil inlet hole 312 may be provided on the cylinder wall of the sleeve structure, or multiple oil inlet holes 312 may be provided. When multiple oil inlet holes 312 are provided, the multiple oil inlet holes 312 are provided on the cylinder wall of the sleeve structure at intervals along the axial direction of the sleeve structure.

[0064] Each plunger hole 28 includes a first end and a second end facing each other, the first end of the plunger hole 28 is connected to the gap 41, and the second end of the plunger hole 28 is connected to the outer surface of the front cover 20. The threaded plug 33 of the plunger assembly 30 is screwed to the second end of the plunger hole 28, the blocking end of the plunger 31 of the plunger assembly 30 is in contact with the outer peripheral surface of the eccentric portion 42, and the support seat 34 of the plunger assembly 30, the threaded plug 33 and the plunger 31 together enclose a working chamber 311 connected to the oil inlet hole 312 on the plunger 31.

[0065] The eccentric shaft 40 may be drivably connected to a driving device, which may be, for example, a motor. For example, the driving device may drive the eccentric shaft 40 to rotate forward or reverse according to actual working conditions.

[0066] The oil enters the oil inlet chamber 13 from the liquid inlet port 11, and the oil in the oil inlet chamber 13 enters the gap 41 through the through hole. Under the rotation of the eccentric shaft 40, the eccentric part 42 presses each plunger assembly 30 to reciprocate between the liquid inlet position and the liquid outlet position along the radial direction of the front cover 20. At the liquid inlet position, the oil inlet hole 312 of the plunger 31 extends into the gap 41 to connect the working chamber 311 with the gap 41, and the oil flows into the working chamber 311 of the plunger assembly 30 through the oil inlet hole 312. The front cover 20 is provided with an oil drain hole 27 that corresponds to and is connected to each plunger hole 28, and the oil drain hole 27 is also connected to the working chamber 311 of the plunger assembly 30. The oil drain hole 27 extends along the axial direction of the front cover 20 to the housing 10 and is connected to the oil outlet chamber 14.

[0067] like Figure 5 As shown, the plunger pump 1 further includes a first valve assembly 50 disposed in each oil discharge hole 27, and the first valve assembly 50 is used to connect the working chamber 311 with the liquid outlet chamber. Exemplarily, the first valve assembly 50 is a one-way valve assembly.

[0068] When the eccentric shaft 40 rotates to press the plunger 31 back into the plunger hole 28, so that the plunger 31 is in the liquid outlet position, the oil inlet hole 312 on the plunger 31 is located in the plunger hole 28, and under the action of the first valve body assembly 50, the oil in the working chamber 311 is discharged into the oil outlet chamber 14, and then discharged from the liquid outlet 12. In this way, the pumping of the oil is completed.

[0069] It should be noted that the eccentric portion 42 presses each plunger assembly 30 to reciprocate between the liquid inlet position and the liquid outlet position along the radial direction of the front cover 20, and the gap 41 range where the plunger 31 moving from the liquid inlet position to the liquid outlet position is located constitutes an oil discharge chamber, and the gap 41 range where the plunger 31 moving from the liquid outlet position to the liquid inlet position is located constitutes an oil suction chamber.

[0070] like Figure 7 As shown, in one embodiment, a limiting structure 35 is provided between the seat body of the support seat 34 and the end cap 331 of the threaded plug 33, and the support seat 34 can be limited to a preset position by the limiting structure 35. Exemplarily, the limiting structure 35 can be provided at a preset position, that is, the position where the limiting structure 35 is located is the preset position, so that the support seat 34 is limited to the preset position by the limiting structure 35. The preset position can be set according to actual needs, for example, it can be the center position of the end cap 331 of the threaded plug 33.

[0071] By limiting the support seat 34 through the limiting structure 35, it is possible to effectively avoid the position of the spring arranged on the support seat 34 from being offset, and the deformation of the spring caused by the offset of the position of the support seat 34, thereby improving the accuracy of the force output by the spring, thereby effectively improving the pumping performance of the plunger pump 1.

[0072] Continue to refer Figure 7In one embodiment, the support seat 34 includes a head 341 and a rod 342 connected to each other. The outer end surface 3411 of the head 341 is attached to the inner surface of the end cover 331, that is, the end cover 331 can stop and limit the head 341, so that the plunger assembly 30 can complete actions such as pumping oil. The limiting structure 35 includes a first matching portion 351 arranged on the inner surface of the end cover 331, and the limiting structure 35 also includes a second matching portion 352 arranged on the outer end surface 3411 of the head 341. The first matching portion 351 matches with the second matching portion 352 to limit the support seat 34 to a preset position. Exemplarily, the first matching portion 351 can be, for example, a groove arranged on the inner surface of the end cover 331, and the position of the groove is the preset position. The second matching portion 352 can be, for example, a protrusion arranged on the outer end surface 3411 of the head 341. By making the protrusion snap into the groove, the support seat 34 is limited to the preset position. The first matching portion 351 and the second matching portion 352 may also be other matching forms, such as magnetic positioning, etc. The matching form of the first matching portion 351 and the second matching portion 352 can be set according to actual needs and is not specifically limited here.

[0073] Such a configuration makes the limiting structure 35 simple in structure and easy to process, while also improving the convenience and accuracy of limiting the support seat 34 , thereby helping to improve the pumping performance of the plunger pump 1 .

[0074] Continue to refer Figure 7 In one embodiment, the first matching portion 351 includes a limiting groove 3311 disposed on the inner surface of the end cover 331, and the position of the limiting groove 3311 may be, for example, a preset position. The outer end surface 3411 of the head 341 is inclined in a direction away from the end cover 331 along the direction from the center to the edge. For example, the center of the outer end surface 3411 of the head 341 may be a point, that is, the outer end surface 3411 of the head 341 is inclined in a direction away from the end cover 331 along the direction from the center point to the edge, so that the outer end surface 3411 of the head 341 may be a conical surface; the center of the outer end surface 3411 of the head 341 may also be an area, which may be, for example, circular, square, triangular, etc., that is, the outer end surface 3411 of the head 341 is inclined in a direction away from the end cover 331 along the direction from the center area to the edge, so that the outer end surface 3411 of the head 341 may be a truncated table surface or a prism table surface.

[0075] The outer end surface 3411 of the head 341 constitutes the second matching portion 352 , and the limiting groove 3311 corresponds to the central area position of the outer end surface 3411 of the head 341 , so that the outer end surface 3411 of the head 341 can be inserted into the limiting groove 3311 to limit the support seat 34 at a preset position.

[0076] By adopting such a setting form, on the one hand, the structure of the limiting structure 35 is simple and easy to process. On the other hand, after the second matching portion 352 is inserted into the limiting groove 3311, a gap 41 will be generated between the outer end surface 3411 of the head 341 and the inner surface of the end cover 331, thereby providing a movable space for the support seat 34. When the support seat 34 is subjected to an external force, for example, during the process of the plunger assembly 30 pumping oil, the spring provides a thrust to the support seat 34, and the support seat 34 can make a circular motion around the central area of ​​the outer end surface 3411 of the head 341. In this process, the axial position of the support seat 34 remains unchanged, thereby effectively avoiding the position of the spring set on the support seat 34 from being offset, and the deformation of the spring caused by the offset of the position of the support seat 34, thereby improving the accuracy of the force output by the spring, thereby effectively improving the pumping performance of the plunger pump 1.

[0077] In one embodiment, the outer end surface 3411 of the head 341 is a conical surface, that is, the outer end surface 3411 of the head 341 is inclined from the center point to the edge in the direction away from the end cover 331. With such a configuration, on the one hand, it is convenient to process the outer end surface 3411 of the head 341, thereby improving the processing efficiency of the plunger assembly 30. On the other hand, it can effectively improve the smoothness when the second matching portion 352 is inserted into the limiting groove 3311, thereby improving the limiting effect of the support seat 34.

[0078] In one embodiment, the notch of the limiting groove 3311 is circular to match the shape of the outer end surface 3411 of the head 341, thereby facilitating the second matching portion 352 to be inserted into the limiting groove 3311 while further improving the smoothness of the second matching portion 352 when being inserted into the limiting groove 3311, thereby effectively improving the limiting effect of the support seat 34.

[0079] The center of the notch of the limiting groove 3311 coincides with the center of the inner surface of the end cover 331, that is, the preset position is the center position of the inner surface of the end cover 331. Such a design can improve the uniformity of the distance between the outer edge of the head 341 and the outer edge of the inner surface of the end cover 331, thereby effectively avoiding interference with the end cover 331 during the circular motion of the support seat 34, thereby ensuring the normal operation of the plunger assembly 30, and further facilitating the improvement of the pumping performance of the plunger pump 1.

[0080] like Figure 5As shown, in one embodiment, the first valve body assembly 50 includes a one-way valve body 54, a one-way valve seat 51, a one-way valve spring 52 and a one-way valve cover 53. The one-way valve seat 51 is arranged in the oil discharge hole 27. A through hole 511 is arranged on the one-way valve seat 51 along the axial direction of the oil discharge hole 27. The one-way valve cover 53 is arranged at one end of the through hole 511 facing the oil outlet cavity 14 to block it. The one-way valve body 54 includes a sleeve structure with a hollow cavity inside and one end blocked, which is sleeved on the one-way valve seat 51. The one-way valve body 54 is provided with a plurality of oil outlet holes 541 connected to the hollow cavity along its axial direction. The one-way valve spring 52 is arranged between the blocked end of the one-way valve body 54 and the one-way valve cover 53.

[0081] When the plunger 31 is in the liquid inlet position, the volume of the working chamber 311 increases, and then the pressure in the working chamber 311 and the through hole 511 decreases, and the one-way valve spring 52 is in a gradually extended state. Under the action of the one-way valve spring 52, the one-way valve cover 53 blocks the through hole 511.

[0082] When the plunger 31 is in the liquid discharge position, the volume of the working chamber 311 decreases, and then the pressure in the working chamber 311 and the through hole 511 increases, causing the one-way valve spring 52 to gradually shrink, and the one-way valve cover 53 moves away from the plunger 31, so that the oil in the working chamber 311 is discharged into the oil outlet chamber 14 through the oil outlet hole 541, and finally discharged from the liquid outlet 12.

[0083] In this embodiment, the first valve body assembly 50 is used to realize unidirectional transmission of oil, thereby effectively preventing diversion of the oil, which is beneficial to the pumping effect of the plunger pump 1 .

[0084] Continue to refer Figure 5 In one embodiment, the plunger pump 1 further includes a second valve body assembly 60, which is, for example, a safety valve assembly. The second valve body assembly 60 is located in the oil outlet chamber 14 and is disposed on the valve plate 15. The second valve body assembly 60 is provided with a guide chamber and a first port and a second port connected to the guide chamber, wherein the first port can be connected to the oil outlet chamber 14, and the second port is connected to the oil inlet chamber 13. The second valve body assembly 60 is used for opening the first port when the pressure in the oil outlet chamber 14 reaches a preset pressure value, so that part of the oil in the oil outlet chamber 14 enters the oil inlet chamber 13 through the guide chamber.

[0085] Exemplarily, the second valve body assembly 60 includes a safety valve seat 61, a safety valve spring 62, a plurality of spherical plugging members 63, a supporting structure 64 and a fixing structure 65. The fixing structure 65 is arranged on the valve plate 15, and is provided with a first through hole 651 connecting the oil inlet chamber 13 and the oil outlet chamber 14. A chamber is provided inside the safety valve seat 61, and the chamber has an open end and a plugging end. The safety valve seat 61 is mounted on the fixing structure 65, and the hollow cavity is connected to the first through hole 651 of the fixing structure 65, and the plugging end on the safety valve seat 61 is located in the oil outlet chamber 14. A second through hole 612 connecting the inner cavity 611 is provided on the plugging end of the safety valve seat 61. The support structure 64 is arranged in the inner cavity 611, and includes a connecting portion 641 and a supporting portion 642 connected to each other. The outer contour of the supporting portion 642 is adapted to the hollow cavity. A plurality of spherical plugging members 63 are arranged between the supporting portion 642 and the plugging end of the safety valve seat 61. The diameter of each spherical plugging member 63 is adapted to the diameter of the second through hole 612, so that each spherical plugging member 63 can be inserted into the second through hole 612 to achieve the plugging of the second through hole 612. The connecting portion 641 of the support structure 64 faces the fixed structure 65, and one end of the safety valve spring 62 is connected to the connecting portion 641, and the other end is connected to the fixed structure 65. The support structure 64 is provided with a guide hole 643 that penetrates the supporting portion 642 and the connecting portion 641.

[0086] When the pressure in the oil outlet cavity 14 does not reach the preset pressure value, the preset pressure value may be, for example, 20 N. Under the action of the safety valve spring 62 , one of the plurality of spherical blocking members 63 is inserted into the second through hole 612 to block the second through hole 612 .

[0087] When the pressure value in the oil outlet chamber 14 reaches the preset pressure value, the safety valve spring 62 is forced to gradually shrink, and the spherical plugging member 63 plugged on the second through hole 612 moves away from the second through hole 612. The oil in the oil outlet chamber 14 enters the inner cavity 611 of the safety valve seat 61 from the second through hole 612, passes through the guide hole 643 on the support structure 64, and flows into the oil inlet chamber 13 through the first through hole 651 on the fixed structure 65, until the pressure in the oil outlet chamber 14 is less than the preset pressure value, and the safety valve spring 62 is reset. One of the multiple spherical plugging members 63 is inserted into the second through hole 612 to achieve the plugging of the second through hole 612.

[0088] In this embodiment, by setting the second valve body assembly 60, the pressure in the oil outlet chamber 14 can always be within the preset pressure value range, and the pressure of the safety valve assembly can be adjusted according to actual needs, thereby improving the flexibility of use of the plunger pump 1 and meeting the different needs of users.

[0089] Continue to refer Figure 5In one embodiment, the second shaft hole 26 is a stepped hole, and the large diameter section 261 of the stepped hole is located on the side of the small diameter section 262 away from the eccentric portion 42. During the operation of the plunger pump 1, the oil in the oil suction chamber or the oil discharge chamber may seep out from the second shaft hole 26. To avoid this phenomenon, the plunger pump 1 also includes an oil seal structure 70, which is arranged in the large diameter section 261 to achieve sealing between the second end of the eccentric shaft 40 and the front cover 20. The oil seal structure 70 plays a sealing role and can effectively shield the oil in the plunger pump 1, thereby further improving the reliability of the plunger pump 1 and extending the service life of the plunger pump 1.

[0090] like Figure 8 and Fig. 9 As shown, in one embodiment, the oil seal structure 70 includes a skeleton ring 71 and an elastic layer 72 coated on the outside of the skeleton ring 71. The skeleton ring 71 is sleeved on the eccentric shaft 40, and the skeleton ring 71 plays a supporting role. A first sealing lip 73 and a second sealing lip 74 are arranged on the inner wall of the elastic layer 72 along the axial direction of the eccentric shaft 40. The first sealing lip 73 can be, for example, V-shaped, and the second sealing lip 74 can also be, for example, V-shaped. Among them, the first sealing lip 73 and the second sealing lip 74 are both in contact with the outer peripheral surface of the eccentric shaft 40. With such a setting form, the sealing effect of the oil seal structure 70 can be achieved through the first sealing lip 73 and the second sealing lip 74. Illustratively, when the plunger pump 1 is assembled on the engine or gearbox of a car, the first sealing lip 73 is used to stop the oil in the plunger pump 1, and the second sealing lip 74 is used to stop the oil in the engine or gearbox. The cooperation between the first sealing lip 73 and the second sealing lip 74 can effectively avoid the crossflow between the oil in the plunger pump 1 and the oil in the engine or gearbox, thereby further improving the sealing effect of the oil seal structure 7.

[0091] Continue to refer Fig. 9 In one embodiment, the oil seal structure 70 further includes two elastic members 75. The two elastic members 75 may be, for example, self-tightening springs. The two elastic members 75 are respectively sleeved on the surface of the first sealing lip 73 facing away from the eccentric shaft 40 and the surface of the second sealing lip 74 facing away from the eccentric shaft 40. By providing the elastic member 75, the adhesion force of the first sealing lip 73 and the second sealing lip 74 when they are attached to the eccentric shaft 40 can be effectively improved, thereby further improving the sealing effect of the first sealing lip 73 and the second sealing lip 74, and further improving the reliability of the plunger pump 1. It should be noted that when the eccentric shaft 40 is working, the lip ends of the first sealing lip 73 and the second sealing lip 74 of the oil seal structure 70 will be tightly attached to the outer peripheral surface of the eccentric shaft 40, and the elastic member 75 can provide radial tightening force for the first sealing lip 73 and the second sealing lip 74.

[0092] Since fluororubber has high temperature resistance, fluororubber can withstand a temperature range of -60 to +250 degrees Celsius, for example. At the same time, fluororubber also has excellent oil resistance, for example, it has tolerance to various oils such as high-temperature fuel oil, sulfur-containing lubricating oil, hydraulic oil, diester oil, silicate, etc. Based on this, in one embodiment, the elastic layer 72 of the oil seal structure 70 is made of fluororubber. Such a setting can further improve the reliability of the sealing ring, thereby effectively improving the reliability of the plunger pump 1 and improving the working stability of the plunger pump 1.

[0093] like Figure 5 As shown, in one embodiment, the front cover 20 is provided with a pressure relief channel 25, one end of the pressure relief channel 25 is connected to the second oil storage tank 231, and the other end of the pressure relief channel 25 is connected to the large diameter section 261. With such a configuration, the oil flowing into the large diameter section 261 can be discharged into the second oil storage tank 231 in time, avoiding excessive oil pressure in the large diameter section 261 affecting the sealing performance of the sealing structure, thereby further improving the reliability of the plunger pump 1.

[0094] The contents described above may be implemented individually or in combination in various ways, and these variations are all within the protection scope of this application.

[0095] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A plunger pump, characterized in that: The plunger pump includes a pump housing and an eccentric shaft, wherein the eccentric shaft is arranged in the pump housing, the eccentric shaft includes an eccentric portion, the pump housing and the eccentric portion enclose an oil suction chamber and an oil discharge chamber, gaskets are arranged on both end surfaces of the eccentric portion, an oil storage tank is arranged on the surface of the pump housing opposite to the gasket, and the oil storage tank is connected to the oil suction chamber or the oil discharge chamber.

2. The plunger pump according to claim 1, characterized in that: The pump casing includes a shell and a front cover which are connected to each other. A valve plate is provided at one end of the shell facing the front cover. The valve plate and the shell form an oil outlet chamber. A first eccentric shaft seat is provided on the side of the valve plate facing the front cover. The first eccentric shaft seat, the front cover and the eccentric part form the oil suction chamber and the oil discharge chamber. A first axial hole is provided in the first eccentric shaft seat. The first end of the eccentric shaft is rotatably provided in the first axial hole. The first end face of the eccentric part is opposite to the first eccentric shaft seat. The gasket includes a first gasket provided between the first end face and the first eccentric shaft seat. The oil storage tank includes a first oil storage tank provided on the first surface of the first eccentric shaft seat facing the first gasket.

3. The plunger pump according to claim 2, characterized in that: The first eccentric shaft seat also includes an outer circumferential surface connected to the first surface. The first oil storage groove is recessed inward from the first surface. Along the radial direction of the first eccentric shaft seat, the first end of the first oil storage groove passes through the outer circumferential surface, and the second end of the first oil storage groove is connected to the first shaft hole.

4. The plunger pump according to claim 3, characterized in that: The depth of the first oil storage tank gradually increases from the first end of the oil storage tank to the second end of the oil storage tank.

5. The plunger pump according to claim 2, characterized in that: The projection of the first gasket on the first surface partially overlaps with the projection of the first oil storage groove on the first surface.

6. The plunger pump according to any one of claims 2 to 5, characterized in that: The front cover includes a connected side wall and a bottom wall, a plurality of plunger assemblies are arranged on the side wall, an outer peripheral surface of the first eccentric shaft seat abuts against the side wall, a second eccentric shaft seat is arranged on the bottom wall, a second eccentric shaft seat is arranged in the second eccentric shaft seat, a second axial hole is arranged, the second end surface of the eccentric portion is opposite to the second eccentric shaft seat, the gasket also includes a second gasket arranged between the second end surface and the second eccentric shaft seat, and the oil storage tank also includes a second oil storage tank arranged on the second surface of the second eccentric shaft seat facing the second gasket.

7. The plunger pump according to claim 6, characterized in that The second oil storage groove is recessed inward from the second surface and communicated with the second shaft hole.

8. The plunger pump according to claim 6, characterized in that The projection of the second gasket on the second surface partially overlaps with the projection of the second oil storage groove on the second surface.

9. The plunger pump according to claim 6, characterized in that: The second axial hole is a stepped hole, the large diameter section of the stepped hole is located on the side of the small diameter section away from the eccentric portion, and the plunger pump further includes: An oil seal structure is provided at the large diameter section to achieve sealing between the second end of the eccentric shaft and the front cover.

10. The plunger pump according to claim 9, characterized in that The front cover is provided with a pressure relief channel, one end of the pressure relief channel is connected to the second oil storage tank, and the other end of the pressure relief channel is connected to the large diameter section.

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