Plunger pump

Abstract

The plunger pump of the present invention comprises a pump body, a rotating shaft assembly and a plunger assembly. The pump body is provided with an oil chamber, a plunger chamber and a working chamber. The oil chamber can be used to place lubricating oil. The pump body is provided with a pump cover for sealing the oil chamber. The plunger assembly comprises: a plunger; a slider, the slider is movably arranged in the plunger chamber along the radial direction of the pump body, the slider is connected to the plunger, the slider and the wall surface of the plunger chamber define a lubrication chamber and the volume of the lubrication chamber can be changed when the slider moves, the slider has a first hole and a second hole, the lubrication chamber and the oil chamber are connected through the first hole, a first pin shaft and a first bearing, the first pin shaft is arranged on the slider, the first bearing is annular and rotatably sleeved on the outer peripheral surface of the first pin shaft, the outer peripheral surface of the first pin shaft and the inner wall surface of the first bearing define a first lubrication gap, and the first pin shaft has a third hole; a connecting rod, the first end of the connecting rod is connected to the first bearing. The plunger pump according to the present invention has the advantages of good lubrication effect and convenient normal operation.

Description

Technical Field

[0001] The invention relates to the technical field of liquid pumps, and in particular to a plunger pump. Background Art

[0002] The connecting rod in the plunger assembly of the plunger pump swings relative to other structures through the pin and bearing. Lubricating oil is required between the pin and the bearing to ensure the normal operation of the plunger assembly. In the related art, the lubricating oil in the pump body is difficult to enter the gap between the pin and the bearing, resulting in poor lubrication effect between the pin and the bearing, which makes the plunger pump prone to failure. Summary of the invention

[0003] The present invention is based on the inventor's discovery and understanding of the following facts and problems: In the related art, after the bearing and the pin shaft are matched, the lubricating oil in the pump body enters the gap between the pin shaft and the bearing from both sides of the gap between the pin shaft and the bearing. The gap between the pin shaft and the bearing is small, so that the lubricating oil entering the gap between the pin shaft and the bearing is small, and then the lubricating oil entering the gap between the lubricating bearing and the pin shaft is small, resulting in poor lubrication effect between the pin shaft and the bearing.

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides a plunger pump.

[0005] The plunger pump of the embodiment of the present invention comprises a pump body, a rotating shaft assembly and a plunger assembly, wherein the pump body is provided with an oil chamber, a plunger chamber and a working chamber, wherein the oil chamber can be used to place lubricating oil, and the pump body is provided with a pump cover for sealing the oil chamber, wherein the oil chamber, the plunger chamber and the working chamber are sequentially arranged in the radial direction of the pump body, the rotating shaft assembly is arranged in the oil chamber, and the rotating shaft assembly is rotatable relative to the pump body, and the plunger assembly comprises:

[0006] A plunger, at least a portion of which is movably disposed in the working chamber along the radial direction of the pump body;

[0007] A slider, the slider is movably arranged in the plunger cavity along the radial direction of the pump body, the slider is connected to the plunger, the slider and the wall surface of the plunger cavity define a lubrication cavity, and the volume of the lubrication cavity can be changed when the slider moves, the slider has a first hole and a second hole, the lubrication cavity and the oil cavity are connected through the first hole,

[0008] a first pin shaft and a first bearing, wherein the first pin shaft is arranged on the slider, the first bearing is annular and rotatably sleeved on the outer circumference of the first pin shaft, a first lubrication gap is defined between the outer circumference of the first pin shaft and the inner wall surface of the first bearing, the first pin shaft has a third hole, and the lubrication cavity, the second hole, the third hole and the first lubrication gap are connected in sequence;

[0009] A connecting rod, wherein the first end of the connecting rod is connected to the first bearing, and the second end of the connecting rod is matched with the rotating shaft assembly to drive the connecting rod to move when the rotating shaft assembly rotates.

[0010] Therefore, the plunger pump according to the embodiment of the present invention has the advantages of good lubrication effect and convenient normal operation.

[0011] In some embodiments, the slider has a pin shaft hole passing through it, the first pin shaft is arranged in the pin shaft hole, the axial direction of the pin shaft hole and the axial direction of the first pin shaft are consistent with the axial direction of the pump body, the wall surface of the plunger cavity, the wall surface of the pin shaft hole and the end surface of the first pin shaft define a lubricating oil chamber, and the second hole and the third hole are connected through the lubricating oil chamber.

[0012] In some embodiments, the first hole and the second hole are both plural, the lubricating oil chambers are two, and each of the lubricating oil chambers has the second hole and the third hole communicated therewith.

[0013] In some embodiments, the third hole includes a first sub-hole and a second sub-hole, the first sub-hole passes through the first pin along the axial direction of the first pin shaft and is connected to the lubricating oil chamber, the second sub-hole extends along the radial direction of the pump body, the second sub-hole is opened on the outer peripheral surface of the first pin and is connected to the first sub-hole, and there is at least one second sub-hole.

[0014] In some embodiments, the plunger cavity and the working cavity are both multiple, and the multiple plunger cavities are connected to the multiple working cavities in a one-to-one correspondence;

[0015] There are multiple plunger assemblies, and the multiple plunger assemblies are matched with the multiple plunger cavities and the multiple working cavities in a one-to-one correspondence;

[0016] A star wheel is arranged in the oil chamber, and the second ends of the plurality of connecting rods are connected to the star wheel. The star wheel is rotatably mounted on the rotating shaft assembly so as to be suitable for driving the plunger assembly to move when the rotating shaft assembly rotates.

[0017] In some embodiments, the plunger pump includes a second pin shaft and a second bearing, the second pin shaft is arranged on the star wheel, the second bearing is annular and rotatably sleeved on the outer circumference of the second pin shaft, the second end of the connecting rod is connected to the second bearing, and a second lubrication gap is defined between the outer circumference of the second pin shaft and the inner wall surface of the second bearing;

[0018] The multiple connecting rods include a main connecting rod and multiple secondary connecting rods. The first end of the main connecting rod is rotatably connected to the slider via the first pin shaft and the first bearing, the second end of the main connecting rod is fixedly connected to the star wheel, the first end of the secondary connecting rod is rotatably connected to the slider via the first pin shaft and the first bearing, the second end of the secondary connecting rod is connected to the second bearing, the first bearing has a fourth hole, the secondary connecting rod has a fifth hole, the second bearing has a sixth hole, and the first lubrication gap, the fourth hole, the fifth hole, the sixth hole and the second lubrication gap are connected in sequence.

[0019] In some embodiments, a first groove is provided on at least one of the inner wall surface of the first bearing and the outer peripheral surface of the first pin shaft, there is at least one first groove, and the first groove constitutes at least a part of the first lubrication gap.

[0020] In some embodiments, the first end of the secondary connecting rod is sleeved on the outer peripheral surface of the first bearing, and the first end of the secondary connecting rod and the outer peripheral surface of the first bearing define a second groove;

[0021] A third groove is provided on at least one of the inner wall surface of the second bearing and the outer peripheral surface of the second pin shaft, and there is at least one third groove, which constitutes at least a part of the second lubrication gap. The second end of the auxiliary connecting rod is sleeved on the outer peripheral surface of the second bearing, and the second end of the auxiliary connecting rod and the outer peripheral surface of the second bearing define a fourth groove. The first groove, the second groove, the third groove and the fourth groove are all annular, and the third hole, the first groove, the fourth hole, the second groove, the fifth hole, the fourth groove, the sixth hole and the third groove are connected in sequence.

[0022] In some embodiments, the star wheel has a star wheel hole, which passes through the star wheel along the axial direction of the pump body, the second pin shaft is arranged in the star wheel hole, a seventh hole is provided on the second pin shaft, and the second lubrication gap is connected with the oil chamber through the seventh hole.

[0023] In some embodiments, a seal is provided in each working cavity and is sleeved on the circumference of the plunger. The end surface of the seal facing the plunger cavity, the wall surface of the plunger cavity and the end surface of the slider facing the working cavity define the lubricating oil cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of a plunger pump according to an embodiment of the present invention.

[0025] Figure 2 is an enlarged view of a plunger pump according to an embodiment of the present invention.

[0026] Figure 3 is a schematic diagram of a plunger assembly according to an embodiment of the present invention.

[0027] Figure 4 is a schematic diagram of a slider according to an embodiment of the present invention.

[0028] Figure 5 is a top view of a slider according to an embodiment of the present invention.

[0029] Reference numerals:

[0030] Piston pump 100;

[0031] Pump body 1, oil chamber 11, plunger chamber 12, working chamber 13, lubrication chamber 14, seal 15, shaft sleeve 16;

[0032] Rotating shaft assembly 2, rotating shaft 21, cam 22, star wheel 23;

[0033] Plunger 4;

[0034] Sliding block 5, first hole 51, second hole 52, pin hole 53, lubricating oil chamber 54;

[0035] A first pin 61, a first bearing 62, a third hole 63, a first sub-hole 64, and a second sub-hole 65;

[0036] Connecting rod 7, first end 71, second end 72, fifth hole 73;

[0037] A second pin 81, a second bearing 82, a sixth hole 83, and a seventh hole 84;

[0038] A first groove 84 , a second groove 85 , a third groove 86 , a fourth groove 87 , and a second oil distribution groove 88 . DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0040] The plunger pump 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings. Figures 1 to 5 As shown, the plunger pump 100 according to the embodiment of the present invention includes a pump body 1, a rotating shaft assembly 2 and a plunger assembly.

[0041] The pump body 1 is provided with an oil chamber 11, a plunger chamber 12 and a working chamber 13. The oil chamber 11 can be used to place lubricating oil, and the pump body 1 is provided with a pump cover for sealing the oil chamber 11. The oil chamber 11, the plunger chamber 12 and the working chamber 13 are sequentially arranged in the radial direction of the pump body 1, and the rotating shaft assembly 2 is arranged in the oil chamber 11, and the rotating shaft assembly 2 is rotatable relative to the pump body 1.

[0042] The plunger assembly includes a plunger 4, a slider 5, a first pin 61, a first bearing 62 and a connecting rod 7. At least part of the plunger 4 is movably disposed in the working chamber 13 along the radial direction of the pump body 1. The slider 5 is movably disposed in the plunger chamber 12 along the radial direction of the pump body 1, the slider 5 is connected to the plunger, the slider 5 and the wall surface of the plunger chamber 12 define a lubrication chamber 14, and the volume of the lubrication chamber 14 can be changed when the slider 5 moves, the slider 5 has a first hole 51 and a second hole 52, and the lubrication chamber 14 and the oil chamber 11 are connected through the first hole 51.

[0043] The first pin 61 is arranged on the slider 5, the first bearing 62 is annular and rotatably sleeved on the outer circumference of the first pin 61, the outer circumference of the first pin 61 and the inner wall of the first bearing 62 define a first lubrication gap, the first pin 61 has a third hole 63, the lubrication cavity 14, the second hole 52, the third hole 63 and the first lubrication gap are connected in sequence. The first end 71 of the connecting rod 7 is connected to the first bearing 62, and the second end 72 of the connecting rod 7 is matched with the rotating shaft assembly 2, so as to drive the connecting rod 7 to move when the rotating shaft assembly 2 rotates.

[0044] The present invention is based on the inventor's discovery and understanding of the following facts and problems: In the related art, after the bearing and the pin shaft are matched, the lubricating oil in the pump body enters the gap between the pin shaft and the bearing from both sides of the gap between the pin shaft and the bearing. The gap between the pin shaft and the bearing is small, so that the lubricating oil entering the gap between the pin shaft and the bearing is small, and then the lubricating oil entering the gap between the lubricating bearing and the pin shaft is small, resulting in poor lubrication effect between the pin shaft and the bearing.

[0045] The plunger pump 100 according to the embodiment of the present invention is provided with a first hole 51 and a second hole 52 on the slider 5, and a third hole 63 on the first pin 61, and the lubrication chamber 14 and the oil chamber 11 are connected through the first hole 51, and the lubrication chamber 14, the second hole 52, the third hole 63 and the first lubrication gap are connected in sequence. Thus, when the shaft assembly 2 rotates and drives the connecting rod 7 to move, that is, when the shaft assembly 2 drives the plunger assembly (slider 5) to reciprocate, the lubricating oil in the oil chamber 11 can enter the lubrication chamber 14 through the first hole 51, and the lubricating oil in the lubrication chamber 14 can pass through the second hole 52 and the third hole 63 in sequence into the first lubrication gap (between the first pin 61 and the first bearing 62), thereby achieving a good lubrication effect between the first pin 61 and the first bearing 62, thereby ensuring the normal operation of the plunger pump 100.

[0046] Therefore, the plunger pump 100 according to the embodiment of the present invention has the advantages of good lubrication effect and convenient normal operation.

[0047] like Figures 1 to 5 As shown, the plunger pump 100 according to the embodiment of the present invention includes a pump body 1, a rotating shaft assembly 2 and a plunger assembly.

[0048] The pump body 1 is provided with an oil chamber 11, a plunger chamber 12 and a working chamber 13. The oil chamber 11 can be used to place lubricating oil. A pump cover for sealing the oil chamber 11 is provided on the pump body 1. The oil chamber 11, the plunger chamber 12 and the working chamber 13 are sequentially arranged in the radial direction of the pump body 1. Specifically, the oil chamber 11 is located in the middle position of the pump body 1, and there are multiple plunger chambers 12 and working chambers 13. The multiple plunger chambers 12 are connected to the multiple working chambers 13 one by one, and each plunger chamber 12 is connected to the oil chamber 11. Two plunger chambers 12 arranged at intervals in the axial direction of the pump body 1 constitute a plunger chamber group, and the multiple plunger chamber groups are arranged at intervals along the axial direction of the pump body 1. For example, the axial direction of the pump body 1 is the left-right direction, and a part of the multiple plunger chambers 12 and the multiple working chambers 13 can extend in the up-down direction. The left-right direction and the up-down direction are as follows. Figure 1 and Figure 2 As indicated by the arrow in .

[0049] The rotating shaft assembly 2 is arranged in the oil chamber 11, and the rotating shaft assembly 2 can rotate relative to the pump body 1. Specifically, the rotating shaft assembly 2 is an eccentric wheel assembly, and the rotating shaft assembly 2 includes a rotating shaft 21 and a cam 22 located on the rotating shaft 21. When the rotating shaft 21 rotates, the cam 22 can drive the plunger assembly to reciprocate, and the lubricating oil in the oil chamber 11 can lubricate the rotating shaft assembly 2. The axial direction of the rotating shaft assembly 2 (rotating shaft 21) is the axial direction of the pump body 1.

[0050] like Figures 1 to 5As shown, the plunger assembly includes a plunger 4, a slider 5, a first pin 61, a first bearing 62 and a connecting rod 7. There are multiple plunger assemblies, and the multiple plunger assemblies are matched with multiple plunger chambers 12 and multiple working chambers 13 in a one-to-one correspondence, so that the plunger 4 in each working chamber 13 can reciprocate along the radial direction of the pump body 1.

[0051] At least part of the plunger 4 is movably disposed in the working chamber 13 along the radial direction of the pump body 1. Specifically, a seal 15 sleeved on the circumference of the plunger 4 is disposed in each working chamber 13, whereby the plunger 4 and the seal 15 can separate the working chamber 13 from the plunger chamber 12, and when the plunger 4 reciprocates in the working chamber 13, the working medium in the working chamber 13 is not easy to enter the plunger chamber 12 and the oil chamber 11.

[0052] The slider 5 is movably disposed in the plunger cavity 12 along the radial direction of the pump body 1. The slider 5 is connected to the plunger 4. The slider 5 and the wall surface of the plunger cavity 12 define a lubrication cavity 14, and the volume of the lubrication cavity 14 can be changed when the slider 5 moves. Specifically, a shaft sleeve 16 is disposed in the pump body 1, and the inner wall surface of the shaft sleeve 16 defines the side wall surface of the plunger cavity 12. The end surface of the seal 15 facing the plunger cavity 12, the wall surface of the plunger cavity 12 (the inner wall surface of the shaft sleeve 16), and the end surface of the slider 5 facing the working cavity 13 define the lubricating oil cavity 11. The end surface of the slider 5 facing the working cavity 13 has a groove, so that the volume of the lubrication cavity 14 can be increased.

[0053] The slider 5 has a first hole 51 and a second hole 52, and the lubrication chamber 14 and the oil chamber 11 are connected through the first hole 51. Specifically, there are multiple first holes 51 and second holes 52, and the first holes 51 and second holes 52 both extend in the radial direction of the pump body 1. The first hole 51 penetrates the slider 5 so that the lubrication chamber 14 and the oil chamber 11 are connected through the first hole 51. When the slider 5 moves toward the oil chamber 11 (rotating shaft assembly 2) in the radial direction of the pump body 1, the volume of the lubrication chamber 14 can be increased and the lubrication oil in the oil chamber 11 can enter the lubrication chamber 14 through the first hole 51. When the slider 5 moves away from the oil chamber 11 (rotating shaft assembly 2) in the radial direction of the pump body 1, the volume of the lubrication chamber 14 can be reduced, so that a part of the lubrication oil in the lubrication chamber 14 enters the oil chamber 11 through the first hole 51, and a part of the lubrication oil can enter the second hole 52.

[0054] like Figures 1 to 5As shown, the first pin 61 is arranged on the slider 5, and the first bearing 62 is annular and rotatably sleeved on the outer circumference of the first pin 61, and the outer circumference of the first pin 61 and the inner wall surface of the first bearing 62 define a first lubrication gap. The first pin 61 has a third hole 63, and the lubrication cavity 14, the second hole 52, the third hole 63 and the first lubrication gap are connected in sequence. Specifically, the slider 5 has a pin hole 53 running through it, and the first pin 61 is arranged in the pin hole 53. The axial direction of the pin hole 53 and the axial direction of the first pin 61 are consistent with the axial direction of the pump body 1. The wall surface of the plunger cavity 12, the wall surface of the pin hole 53 and the end surface of the first pin 61 define a lubricating oil chamber 54, and the second hole 52 and the third hole 63 are connected through the lubricating oil chamber 54. As a result, the lubricating oil entering the second hole 52 can enter the lubricating oil chamber 54, and then enter the first lubrication gap through the third hole 63, thereby improving the lubrication effect of the first pin 61 and the first bearing 62.

[0055] There are two lubricating oil chambers 54, each of which has a second hole 52 and a third hole 63 connected thereto. Specifically, two lubricating oil chambers 54 can be formed in each plunger cavity 12 together with the slider 5 and the first pin shaft 61. The third hole 63 includes a first sub-hole 64 and a second sub-hole 65. The first sub-hole 64 penetrates the first pin along the axial direction of the first pin shaft 61 and is connected to the lubricating oil chamber 54 (at both ends of the first sub-hole 64), and the second sub-hole 65 extends along the radial direction of the pump body 1. The second sub-hole 65 is provided on the outer peripheral surface of the first pin and is connected to the first sub-hole 64. Thus, the lubricating oil in the lubricating oil chamber 54 can enter the first lubrication gap through the first sub-hole 64 and the second sub-hole 65 in sequence. There is at least one second sub-hole 65. Optionally, there are multiple second sub-holes 65 and they are arranged at intervals along the circumference of the first pin shaft 61.

[0056] For example, the slider 5 is cylindrical, the axial direction of the plunger cavity 12, the axial direction of the working cavity 13, and the axial direction of the slider 5 are consistent with the radial direction of the pump body 1, and each slider 5 has four first holes 51 and two second holes 52, and the four first holes 51 and the two second holes 52 are arranged in sequence along the circumference of the slider.

[0057] like Figures 1 to 5As shown, the first end 71 of the connecting rod 7 is connected to the first bearing 62, and the second end 72 of the connecting rod 7 is matched with the rotating shaft assembly 2, so as to drive the connecting rod 7 to move when the rotating shaft assembly 2 rotates. Specifically, a first groove 84 is provided on at least one of the inner wall surface of the first bearing 62 and the outer peripheral surface of the first pin 61, and there is at least one first groove 84, and the first groove 84 constitutes at least part of the first lubricating gap. As a result, the first groove 84 can be made into an oil storage part in the first lubricating gap, so that the lubricating oil can easily fill the first lubricating gap, thereby increasing the lubrication effect. For example, the inner wall surface of the first bearing 62 is provided with the first groove 84, and the inner wall surface of the first bearing 62 is provided with a first oil distribution groove located on both sides of the first groove 84 in the axial direction of the first bearing 62, and the first oil distribution groove is connected with the first groove 84.

[0058] like Figure 1 and Figure 2 As shown, in some embodiments, a star wheel 23 is provided in the oil chamber 11, and the second ends 72 of the plurality of connecting rods 7 are connected to the star wheel 23, and the star wheel 23 is rotatably mounted on the rotating shaft assembly 2, so as to drive the plunger assembly to move when the rotating shaft assembly 2 rotates. Specifically, the plurality of connecting rods 7 are circumferentially arranged on the star wheel 23, and the star wheel 23 is matched with the cam 22 of the rotating shaft 21, so that when the star wheel 23 performs eccentric motion, it can drive the connecting rod 7 to move, thereby driving the slider 5 connected to the connecting rod 7 and the plunger 4 connected to the slider 5 to perform reciprocating motion in the radial direction of the pump body 1, so that the working medium can be sucked into and discharged from the working chamber 13.

[0059] like Figures 1 to 3 As shown, in some embodiments, the plunger pump 100 includes a second pin shaft 81 and a second bearing 82, the second pin shaft 81 is arranged on the star wheel 23, the second bearing 82 is annular and rotatably sleeved on the outer circumference of the second pin shaft 81, the second end 72 of the connecting rod 7 is connected to the second bearing 82, and a second lubrication gap is defined between the outer circumference of the second pin shaft 81 and the inner wall surface of the second bearing 82.

[0060] like Figures 1 to 3 As shown, the multiple connecting rods 7 include a main connecting rod and multiple secondary connecting rods. The first end 71 of the main connecting rod is rotatably connected to the slider 5 through the first pin 61 and the first bearing 62, and the second end 72 of the main connecting rod is fixedly connected to the star wheel 23.

[0061] The first end 71 of the secondary connecting rod is rotatably connected to the slider 5 through the first pin 61 and the first bearing 62, and the second end 72 of the secondary connecting rod 7 is connected to the second bearing 82. Specifically, the first end 71 of the secondary connecting rod is sleeved on the outer circumference of the first bearing 62, and the first end 71 of the secondary connecting rod and the outer circumference of the first bearing 62 define a second groove 85. A third groove 86 is provided on at least one of the inner wall surface of the second bearing 82 and the outer circumference of the second pin 81, and the third groove 86 is at least one, and the third groove 86 constitutes at least part of the second lubrication gap. The second end 72 of the secondary connecting rod is sleeved on the outer circumference of the second bearing 82, and the second end 72 of the secondary connecting rod and the outer circumference of the second bearing 82 define a fourth groove 87. For example, the inner wall surface of the second bearing 82 is provided with the third groove 86, and the inner wall surface of the second bearing 82 is provided with second oil distribution grooves 88 on both sides of the third groove 86 on the second bearing 82, and the second oil distribution groove 88 is connected with the third groove 86.

[0062] The first bearing 62 has a fourth hole, which penetrates the first bearing 62 along the radial direction of the first bearing 62, the secondary connecting rod (connecting rod 7) has a fifth hole 73, and the second bearing 82 has a sixth hole 83, which penetrates the second bearing 82 along the radial direction of the second bearing 82. The first groove 84, the second groove 85, the third groove 86 and the fourth groove 87 are all annular, and the third hole 63, the first groove 84, the fourth hole, the second groove 85, the fifth hole 73, the fourth groove 87, the sixth hole 83 and the third groove 86 are connected in sequence, so that the first lubrication gap, the fourth hole, the fifth hole 73, the sixth hole 83 and the second lubrication gap are connected in sequence. In this way, the lubricating oil in the lubrication cavity 14 can fill the first lubrication gap and the second lubrication gap, so that the lubrication effect between the first pin 61 and the first bearing 62 is good, and the lubrication effect between the second pin 81 and the second bearing 82 is good.

[0063] In some embodiments, the star wheel 23 has a star wheel hole, which penetrates the star wheel 23 along the axial direction of the pump body 1, the second pin shaft 81 is arranged in the star wheel 23 hole, the second pin shaft 81 is provided with a seventh hole, and the second lubrication gap is connected with the oil chamber 11 through the seventh hole 84. Thus, the lubricating oil in the second lubrication gap and the oil chamber 11 can flow mutually.

[0064] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0066] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0068] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0069] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A plunger pump, characterized in that: The invention comprises a pump body, a rotating shaft assembly and a plunger assembly, wherein the pump body is provided with an oil chamber, a plunger chamber and a working chamber, wherein the oil chamber can be used to place lubricating oil, and the pump body is provided with a pump cover for sealing the oil chamber, wherein the oil chamber, the plunger chamber and the working chamber are sequentially arranged in the radial direction of the pump body, the rotating shaft assembly is arranged in the oil chamber, and the rotating shaft assembly is rotatable relative to the pump body, and the plunger assembly comprises: A plunger, at least a portion of which is movably disposed in the working chamber along the radial direction of the pump body; A slider, the slider is movably arranged in the plunger cavity along the radial direction of the pump body, the slider is connected to the plunger, the slider and the wall surface of the plunger cavity define a lubrication cavity, and the volume of the lubrication cavity can be changed when the slider moves, the slider has a first hole and a second hole, the lubrication cavity and the oil cavity are connected through the first hole, a first pin shaft and a first bearing, wherein the first pin shaft is arranged on the slider, the first bearing is annular and rotatably sleeved on the outer circumference of the first pin shaft, a first lubrication gap is defined between the outer circumference of the first pin shaft and the inner wall surface of the first bearing, the first pin shaft has a third hole, and the lubrication cavity, the second hole, the third hole and the first lubrication gap are connected in sequence; A connecting rod, wherein a first end of the connecting rod is connected to the first bearing, and a second end of the connecting rod is matched with the rotating shaft assembly to drive the connecting rod to move when the rotating shaft assembly rotates; The slider has a pin shaft hole passing through it, the first pin shaft is arranged in the pin shaft hole, the axial direction of the pin shaft hole and the axial direction of the first pin shaft are consistent with the axial direction of the pump body, the wall surface of the plunger cavity, the wall surface of the pin shaft hole and the end surface of the first pin shaft define a lubricating oil chamber, and the second hole and the third hole are connected through the lubricating oil chamber; There are a plurality of the first hole and the second hole, there are two lubricating oil chambers, and each lubricating oil chamber has the second hole and the third hole communicated therewith; The third hole includes a first sub-hole and a second sub-hole, the first sub-hole penetrates the first pin shaft along the axial direction of the first pin shaft and is communicated with the lubricating oil chamber, the second sub-hole extends along the radial direction of the pump body, the second sub-hole is opened on the outer peripheral surface of the first pin shaft and is communicated with the first sub-hole, and there is at least one second sub-hole; There are multiple plunger cavities and multiple working cavities, and the multiple plunger cavities are connected to the multiple working cavities in a one-to-one correspondence.

2. The plunger pump according to claim 1, characterized in that: There are multiple plunger assemblies, and the multiple plunger assemblies are matched with the multiple plunger cavities and the multiple working cavities in a one-to-one correspondence; A star wheel is arranged in the oil chamber, and the second ends of the plurality of connecting rods are connected to the star wheel. The star wheel is rotatably mounted on the rotating shaft assembly so as to be suitable for driving the plunger assembly to move when the rotating shaft assembly rotates.

3. The plunger pump according to claim 2, characterized in that: The plunger pump comprises a second pin shaft and a second bearing, wherein the second pin shaft is arranged on the star wheel, the second bearing is annular and rotatably sleeved on the outer circumference of the second pin shaft, the second end of the connecting rod is connected to the second bearing, and a second lubrication gap is defined between the outer circumference of the second pin shaft and the inner wall of the second bearing; The multiple connecting rods include a main connecting rod and multiple secondary connecting rods. The first end of the main connecting rod is rotatably connected to the slider via the first pin shaft and the first bearing, the second end of the main connecting rod is fixedly connected to the star wheel, the first end of the secondary connecting rod is rotatably connected to the slider via the first pin shaft and the first bearing, the second end of the secondary connecting rod is connected to the second bearing, the first bearing has a fourth hole, the secondary connecting rod has a fifth hole, the second bearing has a sixth hole, and the first lubrication gap, the fourth hole, the fifth hole, the sixth hole and the second lubrication gap are connected in sequence.

4. The plunger pump according to claim 3, characterized in that: A first groove is provided on at least one of the inner wall surface of the first bearing and the outer peripheral surface of the first pin shaft. There is at least one first groove, and the first groove constitutes at least a part of the first lubrication gap.

5. The plunger pump according to claim 4, characterized in that: The first end of the auxiliary connecting rod is sleeved on the outer peripheral surface of the first bearing, and the first end of the auxiliary connecting rod and the outer peripheral surface of the first bearing define a second groove; A third groove is provided on at least one of the inner wall surface of the second bearing and the outer peripheral surface of the second pin shaft, and there is at least one third groove, which constitutes at least a part of the second lubrication gap. The second end of the auxiliary connecting rod is sleeved on the outer peripheral surface of the second bearing, and the second end of the auxiliary connecting rod and the outer peripheral surface of the second bearing define a fourth groove. The first groove, the second groove, the third groove and the fourth groove are all annular, and the third hole, the first groove, the fourth hole, the second groove, the fifth hole, the fourth groove, the sixth hole and the third groove are connected in sequence.

6. The plunger pump according to claim 3, characterized in that: The star wheel has a star wheel hole, which penetrates the star wheel along the axial direction of the pump body. The second pin shaft is arranged in the star wheel hole. The second pin shaft is provided with a seventh hole. The second lubrication gap is connected with the oil chamber through the seventh hole.

7. The plunger pump according to any one of claims 1 to 6, characterized in that: A sealing member sleeved on the periphery of the plunger is provided in each of the working chambers. The end surface of the sealing member facing the plunger chamber, the wall surface of the plunger chamber and the end surface of the sliding block facing the working chamber define the lubrication chamber.

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