CN219809101U - Plunger pump - Google Patents

Abstract

The utility model proposes a plunger pump comprising: the pump body is provided with a first cavity and a second cavity, the first cavity and the second cavity are arranged at intervals along the axial direction of the pump body, the pump body further comprises a connecting pipe, the connecting pipe is communicated with the first cavity and the second cavity, the first plunger assembly is movably arranged in the first cavity along the radial direction of the pump body, the second plunger assembly is movably arranged in the second cavity along the radial direction of the pump body, at least part of the first plunger assembly and the wall surface of the first cavity define a first lubrication cavity, the volume of the first lubrication cavity can be changed when the first plunger assembly moves, at least part of the second plunger assembly and the wall surface of the second cavity define a second lubrication cavity, the volume of the second lubrication cavity can be changed when the second plunger assembly moves, and the first lubrication cavity and the second lubrication cavity can be used for placing lubricating oil. The plunger pump has the advantages of good lubricating effect and long service life.

Description

Plunger pump

Technical Field

The utility model relates to the technical field of liquid pumps, in particular to a plunger pump.

Background

The connecting rod in the plunger assembly of the plunger pump swings relatively with other structures through the pin shaft and the bearing, lubricating oil is needed between the pin shaft and the bearing to ensure normal operation of the plunger assembly, in the related art, an external lubricating oil pump is generally adopted to provide oil pressure for the plunger pump, but in the use process of the plunger pump, the problem that the oil pressure of the lubricating oil is inconsistent is easy to exist, and once the lubricating oil pump fails, a lubricating system of the plunger pump cannot work, so that the lubricating effect of parts needing to be lubricated such as the pin shaft and the bearing is poor.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems in the related art to some extent.

Therefore, the embodiment of the utility model provides the plunger pump, which can lubricate the structure of the plunger pump by utilizing the action of the plunger pump without adopting an external lubricating oil pump, has good lubricating effect, reduces the occurrence of faults and prolongs the service life.

The plunger pump of the embodiment of the utility model comprises:

the pump body is provided with a first chamber and a second chamber, the first chamber and the second chamber are arranged at intervals along the axial direction of the pump body, and the pump body further comprises a connecting pipe which is communicated with the first chamber and the second chamber;

a first plunger assembly and a second plunger assembly, wherein the first plunger assembly is movably arranged in the first cavity along the radial direction of the pump body, the second plunger assembly is movably arranged in the second cavity along the radial direction of the pump body, at least part of the first plunger assembly and the wall surface of the first cavity define a first lubrication cavity, the volume of the first lubrication cavity can be changed when the first plunger assembly moves,

the second plunger assembly defines a second lubrication chamber with at least a portion of the wall of the second chamber and is movable to change the volume of the second lubrication chamber when the second plunger assembly is moved, the first lubrication chamber and the second lubrication chamber being operable to hold lubrication oil.

The lubricating oil in the plunger pump provided by the embodiment of the utility model can flow back and forth in the first lubricating cavity and the second lubricating cavity, so that the lubricating effect is realized, the external lubricating oil pump is not relied on, the occurrence of faults of the plunger pump provided by the embodiment of the utility model is reduced, and the service life is prolonged.

In some embodiments, the plunger pump further comprises an oil chamber and a shaft assembly, the oil chamber being operable to hold lubricating oil;

the rotating shaft assembly is arranged in the oil cavity and can rotate relative to the pump body;

at least one of the first chamber and the second chamber comprises a working cavity and a plunger cavity which are sequentially arranged along the radial direction of the pump body;

at least one of the first plunger component and the second plunger component comprises a plunger, a sliding block and a connecting rod which are connected in sequence, at least part of the plunger is movably arranged in the plunger cavity along the radial direction of the pump body, the sliding block is matched with the working cavity, the wall surfaces of the sliding block and the working cavity define one of the first lubrication cavity and the second lubrication cavity,

the slider has a first hole and a second hole, one of the first lubrication chamber and the second lubrication chamber is communicated with the oil chamber through the first hole,

the first end of the connecting rod is connected with the sliding block, 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.

In some embodiments, at least one of the first plunger assembly and the second plunger assembly further comprises a first pin shaft and a first bearing, the first pin shaft is arranged on the sliding block, the first bearing is annularly and rotatably sleeved on the outer circumferential surface of the first pin shaft, the first end of the connecting rod is connected with the first bearing, a first lubrication gap is defined between the outer circumferential surface of the first pin shaft and the inner wall surface of the first bearing, the first pin shaft is provided with a third hole, and the lubrication cavity, the second hole, the third hole and the first lubrication gap are sequentially communicated.

In some embodiments, the slider has a pin shaft hole penetrating therethrough, the first pin shaft is disposed in the pin shaft hole, an axial direction of the first pin shaft is consistent with an axial direction of the pump body, a wall surface of the plunger cavity, a wall surface of the pin shaft hole, and an end surface of the first pin shaft define a lubrication oil chamber, and the second hole and the third hole are communicated through the lubrication oil chamber.

In some embodiments, the third hole includes a first sub-hole penetrating the first pin in an axial direction of the first pin and communicating with the lubrication oil chamber, and a second sub-hole extending in a radial direction of the pump body, the second sub Kong Kaishe being on an outer peripheral surface of the first pin and communicating with the first sub-hole, the second sub-hole being at least one.

In some embodiments, the plunger cavity and the working cavity are multiple, and the multiple plunger cavities are communicated with the multiple working cavities in a one-to-one correspondence manner;

the plunger assemblies are in one-to-one correspondence and are matched with the plunger cavities and the working cavities;

and a star wheel is arranged in the oil cavity, the second ends of the connecting rods are connected with the star wheel, and the star wheel is rotatably assembled on the rotating shaft assembly so as to be suitable for driving the plunger assembly to move when the rotating shaft assembly rotates.

In some embodiments, the plunger pump includes a second pin shaft and a second bearing, the second pin shaft is disposed on the star wheel, the second bearing is annular and rotatably sleeved on the outer circumferential surface of the second pin shaft, the second end of the connecting rod is connected with the second bearing, and a second lubrication gap is defined between the outer circumferential surface of the second pin shaft and the inner wall surface of the second bearing;

the plurality of connecting rods comprise a main connecting rod and a plurality of auxiliary connecting rods, a first end part of the main connecting rod is rotationally connected with the sliding block through the first pin shaft and the first bearing, a second end part of the main connecting rod is fixedly connected with the star wheel, a first end part of the auxiliary connecting rod is rotationally connected with the sliding block through the first pin shaft and the first bearing, a second end part of the auxiliary connecting rod is connected with the second bearing, the first bearing is provided with a fourth hole, the auxiliary connecting rod is provided with a fifth hole, the second bearing is provided with a sixth hole, and the first lubrication gap, the fourth hole, the fifth hole, the sixth hole and the second lubrication gap are sequentially communicated.

In some embodiments, at least one of the inner wall surface of the first bearing and the outer circumferential surface of the first pin is provided with a first groove, at least one of the first grooves constituting at least part of the first lubrication gap.

In some embodiments, the first end of the secondary link is sleeved on the outer peripheral surface of the first bearing, and the first end of the secondary link and the outer peripheral surface of the first bearing define a second groove;

the second bearing comprises a second pin shaft, wherein the second pin shaft is provided with a second end part, the second end part of the second pin shaft is sleeved on the outer peripheral surface of the second bearing, the second end part of the auxiliary connecting rod and the outer peripheral surface of the second bearing are respectively provided with a first groove, a second groove, a third groove and a fourth groove, 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 sequentially communicated.

In some embodiments, the star wheel is provided with a star wheel hole, the star wheel hole penetrates 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 arranged on the second pin shaft, and the second lubrication gap is communicated with the oil cavity through the seventh hole.

Drawings

Fig. 1 is a schematic structural view of a plunger pump according to an embodiment of the present utility model.

Fig. 2 is an enlarged schematic view of a shown in fig. 1.

Fig. 3 is a schematic structural view of a plunger pump according to an embodiment of the present utility model.

FIG. 4 is a schematic cross-sectional view of a plunger pump according to an embodiment of the present utility model

Fig. 5 is a schematic structural view of a first plunger assembly or a second plunger assembly of a plunger pump according to an embodiment of the present utility model.

Fig. 6 is a schematic structural view of a slider of a plunger pump according to an embodiment of the present utility model.

Fig. 7 is a schematic structural view of a slider of a plunger pump according to an embodiment of the present utility model.

Reference numerals:

a pump body 1; an oil chamber 11; a first chamber 12; a first lubrication chamber 121; a second chamber 13; a second lubrication chamber 131; a working chamber 14; a plunger cavity 15; a first pressure relief vent 16; a second pressure relief vent 17; a connection pipe 18; a pump cover 19; a seal 10;

a spindle assembly 2; a rotation shaft 21; a cam 22; star wheel 23;

a first plunger assembly 31; a second plunger assembly 32;

a plunger 311;

a slider 312; a first hole 313; a second aperture 314; a lubrication oil chamber 315;

a link 317; a fifth aperture 318; a main link 319; a sub-link 320;

a first bearing 41; a first pin 42; a third hole 43; a first sub-aperture 44, a second sub-aperture 45; a pin hole 46;

the second pin 51, the second bearing 52, the sixth hole 53,

a first groove 55, a second groove 56, a third groove 57, a fourth groove 58, and a second oil distribution groove 59.

Detailed Description

Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

As shown in fig. 1 to 7, the plunger 311 pump according to the embodiment of the present utility model includes: the pump body 1, the first plunger assembly 31 and the second plunger assembly 32.

The pump body 1 has a first chamber 12 and a second chamber 13, the first chamber 12 and the second chamber 13 are arranged at intervals in an axial direction (left-right direction in fig. 4) of the pump body 1, the pump body 1 further includes a connection pipe 18, and the connection pipe 18 communicates the first chamber 12 and the second chamber 13. Specifically, as shown in fig. 1 to 7, the first chamber 12 has a first pressure relief hole 16, the second chamber 13 has a second pressure relief hole 17, and the first pressure relief hole 16 and the second pressure relief hole are communicated through a connecting pipe 18, so that the lubricating oil in the first chamber 12 can enter the second chamber 13 through the first pressure relief hole 16, the connecting pipe 18 and the second pressure relief hole 17 in sequence, or the lubricating oil in the second chamber 13 can enter the first chamber 12 through the second pressure relief hole 17, the connecting pipe 18 and the first pressure relief hole 16 in sequence.

Specifically, as shown in fig. 1 to 7, the pump body 1 is provided with a pump cover 19 for covering the first chamber 12 and the second chamber 13, and the pump cover 19 is detachably connected to the pump body 1, thereby facilitating assembly of the plunger 311 pump.

It is understood that the sizes of the first pressure relief hole 16 and the second pressure relief hole 17 may be set according to the actual working conditions, that is, the sizes of the first pressure relief hole 16 and the second pressure relief hole 17 are controlled, so that the oil pressure of the lubricating oil can be effectively controlled.

The first plunger assembly 31 is movably arranged in the first chamber 12 along the radial direction of the pump body 1, the second plunger assembly 32 is movably arranged in the second chamber 13 along the radial direction of the pump body 1, at least part of the first plunger assembly 31 and the wall surface of the first chamber 12 define a first lubrication cavity 121, the volume of the first lubrication cavity 121 can be changed when the first plunger assembly 31 moves, at least part of the second plunger assembly 32 and the wall surface of the second chamber 13 define a second lubrication cavity 131, the volume of the second lubrication cavity 131 can be changed when the second plunger assembly 32 moves, and both the first lubrication cavity 121 and the second lubrication cavity 131 can be used for placing lubricating oil.

Specifically, as shown in fig. 1-7, the plunger 311 pump further includes an oil chamber 11 and a shaft assembly 2, and the oil chamber 11 is used for placing lubricating oil. The rotating shaft assembly 2 is arranged in the oil cavity 11, and the rotating shaft assembly 2 can rotate relative to the pump body 1. At least one of the first chamber 12 and the second chamber 13 includes a working chamber 14 and a plunger chamber 15 arranged in order in the radial direction of the pump body 1. The first relief hole 16 communicates with the working chamber 14 of the first chamber 12 and the second relief hole 17 communicates with the working chamber 14 of the second chamber 13.

As shown in fig. 1 to 7, taking the first chamber 12 as an example, the oil chamber 11 is located at the middle position of the pump body 1, the plunger chambers 15 and the working chambers 14 are plural, the plural plunger chambers 15 are communicated with the plural working chambers 14 in one-to-one correspondence, and each working chamber 14 is communicated with the oil chamber 11.

The two first chambers 12 and the second chambers 13 which are arranged in the axial direction of the pump body 1 form a chamber group, a plurality of chamber groups are arranged at intervals along the circumferential direction of the pump body 1, the first plunger assembly 31 and the second plunger assembly 32 form a plunger 311 piece group, and the plunger 311 piece groups are matched with the chamber groups in a one-to-one correspondence manner. So that the plunger 311 in each plunger cavity 15 can be driven to reciprocate in the radial direction of the pump body 1 when the rotary shaft assembly 2 is rotated.

As shown in fig. 1-7, the plunger 311 pump further includes a rotary shaft assembly 2, the rotary shaft assembly 2 is disposed in the oil chamber 11, and the rotary shaft assembly 2 is rotatable relative to the pump body 1. Specifically, the rotating shaft assembly 2 is an eccentric wheel assembly, the rotating shaft assembly 2 comprises a rotating shaft 21 and a cam 22 positioned on the rotating shaft 21, when the rotating shaft 21 rotates, the cam 22 can drive the first plunger assembly 31 and the second blocking assembly to reciprocate, lubricating oil in the oil cavity 11 can lubricate the rotating shaft assembly 2, and the axial direction of the rotating shaft assembly 2 (namely, the rotating shaft 21) is the axial direction of the pump body 1.

At least one of the first plunger assembly 31 and the second plunger assembly 32 includes a plunger 311, a slider 312 and a link 317 which are sequentially connected, at least a portion of the plunger 311 is movably disposed in the plunger chamber 15 in a radial direction of the pump body 1, the slider 312 is fitted in the working chamber 14, and the slider 312 and a wall surface of the working chamber 14 define one of the first lubrication chamber 121 and the second lubrication chamber 131, the slider 312 has a first hole 313 and a second hole 314, one of the first lubrication chamber 121 and the second lubrication chamber 131 is communicated with the oil chamber 11 through the first hole 313, a first end of the link 317 is connected with the slider 312, and a second end of the link 317 is fitted with the rotating shaft assembly 2 to drive the link 317 to move when the rotating shaft assembly 2 is adapted to rotate.

Specifically, as shown in fig. 1 to 7, the slider 312 is connected between the link 317 and the plunger 311, and both the slider 312 and the plunger 311 are movable in the up-down direction, and the slider 312 is provided in the working chamber 14 (the slider 312 is hermetically slidable in the working chamber 14), that is, the slider 312 blocks the plunger chamber 15 and the oil chamber 11. A sealing member 10 is arranged in each working chamber 14 and sleeved on the periphery of the plunger 311, so that the plunger 311 is separated from the sealing member 10 and separates the working chamber 14 from the plunger chamber 15, and the plunger 311 reciprocates in the plunger chamber 15, so that working medium in the plunger chamber 15 is not easy to enter the working chamber 14 and the oil chamber 11.

Optionally, the first hole 313 and the second hole 314 are plural, and the first hole 313 and the second hole 314 each extend in the radial direction of the pump body 1, and the first hole 313 penetrates the slider 312 so that one of the first lubrication chamber 121 and the second lubrication chamber 131 communicates with the oil chamber 11 through the first hole 313. When the slider 312 moves in the radial direction of the pump body 1 to the adjacent oil chamber 11 (the rotary shaft assembly 2), the volume of the lubrication chamber can be increased and the lubrication oil in the oil chamber 11 can be facilitated to enter the lubrication chamber through the first hole 313. As the slider 312 moves in the radial direction of the pump body 1 away from the oil chamber 11 (the rotary shaft assembly 2), the volume of the lubrication chamber may be reduced, so that a part of the lubricating oil in the lubrication chamber may enter the oil chamber 11 through the first hole 313, and a part of the lubricating oil may enter the second hole 314.

The plunger 311 pump has a first operating state in which the volume of the first lubrication chamber 121 becomes large and the volume of the second lubrication chamber 131 becomes small, so that the lubrication oil in the second lubrication chamber 131 enters the first lubrication chamber 121 through the pipe; in the second operating state, the volume of the first lubrication chamber 121 becomes smaller and the volume of the second lubrication chamber 131 becomes larger, so that the lubrication oil in the first lubrication chamber 121 enters the second lubrication chamber 131 through the pipe.

It will be appreciated that in the first operating state, the sliding block 312 in the first working chamber 14 moves from top to bottom, so that the volume of the first lubrication chamber 121 becomes larger, the sliding block 312 in the second working chamber 14 moves from bottom to top, so that the volume of the second lubrication chamber 131 becomes smaller, at this time, a part of the lubrication oil in the second lubrication chamber 131 under pressure can flow into the oil chamber 11 through the first hole 313 on the sliding block 312, and a part of the lubrication oil in the second lubrication chamber 131 flows into the first lubrication chamber 121 through the second pressure relief hole 17, the connecting pipe 18 and the first pressure relief hole 16 in sequence. Similarly, in the second operating state, a part of the lubricating oil in the first lubrication chamber 121 is pressurized and flows into the oil chamber 11 through the first hole 313 on the slider 312, and a part of the lubricating oil in the first lubrication chamber 121 flows into the second lubrication chamber 131 through the first relief hole 16, the connecting pipe 18, and the second relief hole 17 in this order.

Therefore, the lubricating oil in the plunger 311 pump of the embodiment of the utility model can flow back and forth in the first lubricating cavity 121 and the second lubricating cavity 131, thereby realizing the lubricating effect, and the plunger 311 pump of the embodiment of the utility model does not depend on an external lubricating oil pump, thereby reducing the occurrence of faults and prolonging the service life.

In addition, the oil pressure of the lubricating oil can be effectively controlled by controlling the sizes of the first relief hole 16 and the second relief hole 17.

Therefore, the plunger 311 pump provided by the embodiment of the utility model has the advantages of good lubricating effect and long service life.

In some embodiments, at least one of the first plunger assembly 31 and the second plunger assembly 32 further includes a first pin 42 and a first bearing 41, the first pin 42 is disposed on the slider 312, the first bearing 41 is annular and rotatably sleeved on an outer circumferential surface of the first pin 42, a first end of the connecting rod 317 is connected to the first bearing 41, a first lubrication gap is defined between the outer circumferential surface of the first pin 42 and an inner wall surface of the first bearing 41, the first pin 42 has a third hole 43, and the lubrication chamber, the second hole 314, the third hole 43, and the first lubrication gap are sequentially communicated.

As shown in fig. 4 to 7, specifically, the slider 312 has a pin hole 46 penetrating therethrough, the first pin 42 is provided in the pin hole 46, the axial direction of the first pin 42 and the axial direction of the pump body 1 coincide, the wall surface of the plunger cavity 15, the wall surface of the pin hole 46 and the end surface of the first pin 42 define a lubrication oil chamber 315, and the second hole 314 and the third hole 43 communicate through the lubrication oil chamber 315. Thereby, the lubricating oil that has entered the second hole 314 can be made to enter the lubricating oil chamber 315 and then enter the first lubricating gap through the third hole 43, thereby improving the lubricating effect of the first pin 42 and the first bearing 41.

The number of lubrication oil chambers 315 is two, and each lubrication oil chamber 315 has a second hole 314 and a third hole 43 communicating therewith. Specifically, two lubrication chambers 315 may be formed within each plunger cavity 15 with the slider 312 and the first pin 42. The third hole 43 includes a first sub-hole 44 and a second sub-hole 45, the first sub-hole 44 penetrates the first pin shaft 42 in the axial direction of the first pin shaft 42 and communicates with the lubrication oil chamber 315 (both ends of the first sub-hole 44 are respectively), the second sub-hole 45 extends in the radial direction of the pump body 1, and the second sub-hole 45 is opened on the outer peripheral surface of the first pin shaft 42 and communicates with the first sub-hole 44. Thereby, the lubricating oil in the lubricating oil chamber 315 can be made to pass through the first sub-holes 44 and the second sub-holes 45 in order into the first lubricating gap. At least one of the second sub-apertures 45. Optionally, the second sub-holes 45 are plural and circumferentially spaced along the first pin 42.

For example, the sliders 312 have a columnar shape, the axial direction of the plunger chamber 15, the axial direction of the working chamber 14, and the axial direction of the sliders 312 coincide with the radial direction of the pump body 1, each slider 312 has four first holes 313 and two second holes 314, and the four first holes 313 and the two second holes 314 are arranged in this order in the circumferential direction of the slider 312.

As shown in fig. 1-4, a first end of the link 317 is connected to the first bearing 41, and a second end of the link 317 is engaged with the shaft assembly 2 to drive the link 317 to move when the shaft assembly 2 rotates. Specifically, at least one of the inner wall surface of the first bearing 41 and the outer peripheral surface of the first pin shaft 42 is provided with a first groove 55, at least one of the first grooves 55, and the first groove 55 constitutes at least part of the first lubrication gap. Thereby, the first groove 55 can be made to be an oil reservoir in the first lubrication gap so that the lubricating oil can easily fill the first lubrication gap, thereby increasing the lubrication effect. For example, the inner wall surface of the first bearing 41 is provided with a first groove 55, and the inner wall surface of the first bearing 41 is provided with first oil distribution grooves on both sides of the first groove 55 in the axial direction of the first bearing 41, the first oil distribution grooves communicating with the first groove 55.

As shown in fig. 1-7, a star 23 is disposed in the oil chamber 11, and a second end of the plurality of links 317 is connected to the star 23, and the star 23 is rotatably mounted on the rotating shaft assembly 2, so as to be adapted to drive the plunger 311 to move when the rotating shaft assembly 2 rotates. Specifically, the plurality of connecting rods 317 are circumferentially disposed on the star wheel 23, and the star wheel 23 is engaged with the cam 22 of the rotating shaft 21, so that when the star wheel 23 performs eccentric motion, the connecting rods 317 can be driven to move, so as to drive the sliding block 312 connected with the connecting rods 317 and the plunger 311 connected with the sliding block 312 to perform reciprocating motion in the radial direction of the pump body 1, thereby sucking and discharging the working medium into and out of the working cavity 14.

In some embodiments, the plunger 311 pump includes a second pin 51 and a second bearing 52, the second pin 51 is disposed on the star wheel 23, the second bearing 52 is annular and rotatably sleeved on the outer peripheral surface of the second pin 51, the second end of the connecting rod 317 is connected to the second bearing 52, and a second lubrication gap is defined between the outer peripheral surface of the second pin 51 and the inner wall surface of the second bearing 52.

As shown in fig. 1-4, the plurality of links 317 includes a main link 319 and a plurality of auxiliary links 320, a first end of the main link 319 is rotatably connected to the slider 312 via a first pin 42 and a first bearing 41, and a second end of the main link 319 is fixedly connected to the star wheel 23. The first end of the sub link 320 is rotatably connected to the slider 312 through the first pin shaft 42 and the first bearing 41, the second end of the sub link 320 is connected to the second bearing 52, the first bearing 41 has a fourth hole, the sub link 320 has a fifth hole 318, the second bearing 52 has a sixth hole 53, and the first lubrication gap, the fourth hole, the fifth hole 318, the sixth hole 53, and the second lubrication gap are sequentially communicated.

Specifically, as shown in fig. 1 to 4, the first end portion of the sub-link 320 is sleeved on the outer peripheral surface of the first bearing 41, and the first end portion of the sub-link 320 and the outer peripheral surface of the first bearing 41 define the second groove 56. At least one of the inner wall surface of the second bearing 52 and the outer peripheral surface of the second pin 51 is provided with a third groove 57, at least one of the third grooves 57, and the third groove 57 constitutes at least part of the second lubrication gap. The second end of the auxiliary link 320 is sleeved on the outer peripheral surface of the second bearing 52, and the second end of the auxiliary link 320 and the outer peripheral surface of the second bearing 52 define a fourth groove 58. For example, the inner wall surface of the second bearing 52 is provided with a third groove 57, and the inner wall surface of the second bearing 52 is provided with second oil-dividing grooves 59 located on both sides of the third groove 57 on the second bearing 52, the second oil-dividing grooves 59 communicating with the third groove 57.

The first bearing 41 has a fourth hole penetrating the first bearing 41 in the radial direction of the first bearing 41, the sub-link 320 (link 317) has a fifth hole 318, the second bearing 52 has a sixth hole 53, and the sixth hole 53 penetrates the second bearing 52 in the radial direction of the second bearing 52. The first groove 55, the second groove 56, the third groove 57 and the fourth groove 58 are all annular, and the third hole 43, the first groove 55, the fourth hole, the second groove 56, the fifth hole 318, the fourth groove 58, the sixth hole 53 and the third groove 57 are sequentially communicated, so that the first lubrication gap, the fourth hole, the fifth hole 318, the sixth hole 53 and the second lubrication gap are sequentially communicated. Thereby, the lubricating oil in the lubricating cavity can fill the first lubricating gap and the second lubricating gap, so that the lubricating effect between the first pin shaft 42 and the first bearing 41 is good, and the lubricating effect between the second pin shaft 51 and the second bearing 52 is good.

In some embodiments, the star wheel 23 has a star wheel 23 hole, the star wheel 23 hole penetrates through the star wheel 23 along the axial direction of the pump body 1, the second pin 51 is arranged in the star wheel 23 hole, the second pin 51 is provided with a seventh hole, and the second lubrication gap is communicated with the oil cavity 11 through the seventh hole. Thereby, the second lubrication gap and the lubricating oil in the oil chamber 1111 can be made to flow mutually.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the utility model.

Claims (10)

1. A plunger pump, comprising:

the pump body is provided with a first chamber and a second chamber, the first chamber and the second chamber are arranged at intervals along the axial direction of the pump body, and the pump body further comprises a connecting pipe which is communicated with the first chamber and the second chamber;

a first plunger assembly and a second plunger assembly, wherein the first plunger assembly is movably arranged in the first cavity along the radial direction of the pump body, the second plunger assembly is movably arranged in the second cavity along the radial direction of the pump body, at least part of the first plunger assembly and the wall surface of the first cavity define a first lubrication cavity, the volume of the first lubrication cavity can be changed when the first plunger assembly moves,

the second plunger assembly defines a second lubrication chamber with at least a portion of the wall of the second chamber and is movable to change the volume of the second lubrication chamber when the second plunger assembly is moved, the first lubrication chamber and the second lubrication chamber being operable to hold lubrication oil.

2. The plunger pump of claim 1, further comprising an oil chamber and a shaft assembly, the oil chamber operable to hold lubricating oil;

the rotating shaft assembly is arranged in the oil cavity and can rotate relative to the pump body;

at least one of the first chamber and the second chamber comprises a working cavity and a plunger cavity which are sequentially arranged along the radial direction of the pump body;

at least one of the first plunger component and the second plunger component comprises a plunger, a sliding block and a connecting rod which are connected in sequence, at least part of the plunger is movably arranged in the plunger cavity along the radial direction of the pump body, the sliding block is matched with the working cavity, the wall surfaces of the sliding block and the working cavity define one of the first lubrication cavity and the second lubrication cavity,

the slider has a first hole and a second hole, one of the first lubrication chamber and the second lubrication chamber is communicated with the oil chamber through the first hole,

the first end of the connecting rod is matched with the sliding block, 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.

3. The plunger pump of claim 2, wherein at least one of the first plunger assembly and the second plunger assembly further comprises a first pin and a first bearing, the first pin is provided on the slider, the first bearing is annularly and rotatably sleeved on the outer circumferential surface of the first pin, the first end of the connecting rod is connected with the first bearing, a first lubrication gap is defined between the outer circumferential surface of the first pin and the inner wall surface of the first bearing, the first pin has a third hole, and the lubrication cavity, the second hole, the third hole and the first lubrication gap are sequentially communicated.

4. A plunger pump as set forth in claim 3 wherein said slider has a pin bore therethrough, said first pin being disposed in said pin bore, the axial direction of said first pin being coincident with the axial direction of said pump body, the wall of said plunger cavity, the wall of said pin bore and the end face of said first pin defining a lubrication chamber, said second bore and said third bore communicating through said lubrication chamber.

5. The plunger pump according to claim 4, wherein the third hole includes a first sub-hole penetrating through the first pin shaft in an axial direction of the first pin shaft and communicating with the lubrication oil chamber, and a second sub-hole extending in a radial direction of the pump body, the second sub Kong Kaishe being on an outer peripheral surface of the first pin shaft and communicating with the first sub-hole, the second sub-hole being at least one.

6. The plunger pump according to claim 5, wherein the plunger chambers and the working chambers are plural, and the plural plunger chambers are communicated with the plural working chambers in one-to-one correspondence;

the plunger assemblies are in one-to-one correspondence and are matched with the plunger cavities and the working cavities;

and a star wheel is arranged in the oil cavity, the second ends of the connecting rods are connected with the star wheel, and the star wheel is rotatably assembled on the rotating shaft assembly so as to be suitable for driving the plunger assembly to move when the rotating shaft assembly rotates.

7. The plunger pump of claim 6, wherein the plunger pump comprises a second pin shaft and a second bearing, the second pin shaft is arranged on the star wheel, the second bearing is annular and is rotatably sleeved on the outer circumferential surface of the second pin shaft, the second end part of the connecting rod is connected with the second bearing, and a second lubrication gap is defined between the outer circumferential surface of the second pin shaft and the inner wall surface of the second bearing;

the plurality of connecting rods comprise a main connecting rod and a plurality of auxiliary connecting rods, a first end part of the main connecting rod is rotationally connected with the sliding block through the first pin shaft and the first bearing, a second end part of the main connecting rod is fixedly connected with the star wheel, a first end part of the auxiliary connecting rod is rotationally connected with the sliding block through the first pin shaft and the first bearing, a second end part of the auxiliary connecting rod is connected with the second bearing, the first bearing is provided with a fourth hole, the auxiliary connecting rod is provided with a fifth hole, the second bearing is provided with a sixth hole, and the first lubrication gap, the fourth hole, the fifth hole, the sixth hole and the second lubrication gap are sequentially communicated.

8. The plunger pump of claim 7, wherein at least one of an inner wall surface of the first bearing and an outer peripheral surface of the first pin is provided with a first groove, at least one of the first grooves constituting at least a part of the first lubrication gap.

9. The plunger pump of claim 8, wherein the first end of the secondary link is sleeved on the outer peripheral surface of the first bearing, the first end of the secondary link and the outer peripheral surface of the first bearing defining a second groove;

the second bearing comprises a second pin shaft, wherein the second pin shaft is provided with a second end part, the second end part of the second pin shaft is sleeved on the outer peripheral surface of the second bearing, the second end part of the auxiliary connecting rod and the outer peripheral surface of the second bearing are respectively provided with a first groove, a second groove, a third groove and a fourth groove, 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 sequentially communicated.

10. The plunger pump of claim 9, wherein the star wheel has a star wheel hole penetrating the star wheel in an axial direction of the pump body, the second pin is disposed in the star wheel hole, a seventh hole is disposed on the second pin, and the second lubrication gap is communicated with the oil chamber through the seventh hole.