CN115370567A - Plunger pump - Google Patents

Abstract

The plunger pump comprises a pump body, a rotating shaft assembly and a plunger assembly, wherein the pump body is provided with an oil cavity, a plunger cavity and a working cavity, the oil cavity can be used for placing lubricating oil, the pump body is provided with a pump cover for sealing and covering the oil cavity, and the plunger assembly comprises: a plunger; the sliding block is movably arranged in the plunger cavity along the radial direction of the pump body and is connected with the plunger, the wall surfaces of the sliding block and the plunger cavity define a lubrication cavity, the volume of the lubrication cavity can be changed when the sliding block moves, the sliding block is provided with a first hole and a second hole, the lubrication cavity is communicated with the oil cavity through the first hole, a first pin shaft and a first bearing are arranged on the sliding block, the first bearing is annularly and rotatably sleeved on the outer peripheral surface of the first pin shaft, a first lubrication gap is defined between the outer peripheral surface of the first pin shaft and the inner wall surface of the first bearing, and the first pin shaft is provided with a third hole; and the first end part of the connecting rod is connected with the first bearing. The plunger pump has the advantages of good lubricating effect and convenience in normal operation.

Description

Plunger pump

Technical Field

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

Background

The connecting rod among the plunger subassembly of plunger pump is through round pin axle and bearing and other structure relative oscillation, needs the lubricated normal work of plunger subassembly of lubricating oil assurance between round pin axle and the bearing, and among the correlation technique, lubricating oil in the pump body is difficult to get into the clearance between round pin axle and the bearing to it is poor to lead to the lubricated effect between round pin axle and the bearing, and then makes the plunger pump break down easily.

Disclosure of Invention

The present invention is based on the discovery and recognition by the inventors of the following facts and problems: in the correlation technique, after the bearing and the pin roll are well matched, lubricating oil in the pump body enters the gap between the pin roll and the bearing from the two sides of the gap between the pin roll and the bearing, the gap between the pin roll and the bearing is small, so that the lubricating oil entering the gap between the pin roll and the bearing is less, and the lubricating effect between the pin roll and the bearing is poor.

The present invention is directed to solving, at least in part, one of the technical problems in the related art. To this end, embodiments of the present invention propose a plunger pump.

The plunger pump comprises a pump body, a rotating shaft assembly and a plunger assembly, wherein the pump body is provided with an oil cavity, a plunger cavity and a working cavity, the oil cavity can be used for containing lubricating oil, the pump body is provided with a pump cover used for sealing the oil cavity, the plunger cavity and the working cavity are sequentially arranged in the radial direction of the pump body, the rotating shaft assembly is arranged in the oil cavity, the rotating shaft assembly can rotate relative to the pump body, and the plunger assembly comprises:

a plunger, at least part of which is movably arranged in the working cavity along the radial direction of the pump body;

the sliding block is movably arranged in the plunger cavity along the radial direction of the pump body, the sliding block is connected with the plunger, a lubricating cavity is defined by the sliding block and the wall surface of the plunger cavity, the volume of the lubricating cavity can be changed when the sliding block moves, the sliding block is provided with a first hole and a second hole, and the lubricating cavity is communicated with the oil cavity through the first hole,

the first pin shaft is arranged on the sliding block, the first bearing is annular and is rotatably sleeved on the outer peripheral surface of the first pin shaft, a first lubricating gap is defined between the outer peripheral 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 lubricating cavity, the second hole, the third hole and the first lubricating gap are sequentially communicated;

and the first end part of the connecting rod is connected with the first bearing, and the second end part of the connecting rod is matched with the rotating shaft component so as to be suitable for driving the connecting rod to move when the rotating shaft component rotates.

Therefore, the plunger pump provided by the embodiment of the invention has the advantages of good lubricating effect and convenience in normal operation.

In some embodiments, the slider has a pin shaft hole penetrating through the slider, 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 the same as the axial direction of the pump body, a lubricating oil chamber is defined by the wall surface of the plunger cavity, the wall surface of the pin shaft hole and the end surface of the first pin shaft, and the second hole and the third hole are communicated through the lubricating oil chamber.

In some embodiments, the first and second bores are each plural, and the lubricating oil chamber is two, each having the second and third bores communicating therewith.

In some embodiments, the third hole includes a first sub-hole that penetrates the first pin in the axial direction of the first pin shaft and communicates with the lubricating oil chamber, and a second sub-hole that extends in the radial direction of the pump body, the second sub-hole being provided in the outer peripheral surface of the first pin and communicating with the first sub-hole, and the number of the second sub-holes is at least one.

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

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

the oil chamber is internally provided with a star wheel, the second end parts 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 lubricating gap is defined between the outer circumferential surface of the second pin shaft and the inner wall surface of the second bearing;

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

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

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

at least one of the inner wall surface of the second bearing and the outer peripheral surface of the second pin shaft is provided with a third groove, the third groove is at least one, the third groove forms at least 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, 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 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 sequentially communicated.

In some embodiments, the star wheel has 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 formed in the second pin shaft, and the second lubricating gap is communicated with the oil cavity through the seventh hole.

In some embodiments, each working cavity is provided with a sealing element sleeved on the periphery of the plunger, and the end surface of the sealing element facing the plunger cavity, the wall surface of the plunger cavity and the end surface of the sliding block facing the working cavity define the lubricating oil cavity.

Drawings

FIG. 1 is a schematic diagram of a plunger pump according to an embodiment of the invention.

Fig. 2 is an enlarged view of a plunger pump according to an embodiment of the present invention.

Fig. 3 is a schematic view of a plunger assembly according to an embodiment of the invention.

FIG. 4 is a schematic view of a slider according to an embodiment of the present invention.

FIG. 5 is a top view of a slider according to an embodiment of the present invention.

Reference numerals:

a plunger pump 100;

the pump body 1, an oil cavity 11, a plunger cavity 12, a working cavity 13, a lubricating cavity 14, a sealing element 15 and a shaft sleeve 16;

the rotating shaft assembly 2, the rotating shaft 21, the cam 22 and the star wheel 23;

a plunger 4;

the slider 5, the first hole 51, the second hole 52, the pin shaft hole 53, and the lubricating oil chamber 54;

a first pin 61, a first bearing 62, a third hole 63, a first sub-hole 64, a second sub-hole 65;

the link 7, the first end 71, the second end 72, the fifth hole 73;

a second pin 81, a second bearing 82, a sixth hole 83, a seventh hole 84;

a first groove 84, a second groove 85, a third groove 86, a fourth groove 87 and a second oil dividing groove 88.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A plunger pump 100 according to an embodiment of the present invention is described below with reference to the drawings. As shown in fig. 1 to 5, a plunger pump 100 according to an embodiment of the present invention includes a pump body 1, a rotary shaft assembly 2, and a plunger assembly.

The pump body 1 is provided with an oil chamber 11, a plunger chamber 12 and a working chamber 13. The oil cavity 11 can be used for containing lubricating oil, the pump cover used for sealing the oil cavity 11 is arranged on the pump body 1, the oil cavity 11, the plunger cavity 12 and the working cavity 13 are sequentially arranged in the radial direction of the pump body 1, 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.

The plunger assembly comprises 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 arranged in the working chamber 13 in the radial direction of the pump body 1. The slide block 5 is movably arranged in the plunger cavity 12 along the radial direction of the pump body 1, the slide block 5 is connected with the plunger, the slide block 5 and the wall surface of the plunger cavity 12 define a lubricating cavity 14, the volume of the lubricating cavity 14 can be changed when the slide block 5 moves, the slide block 5 is provided with a first hole 51 and a second hole 52, and the lubricating cavity 14 is communicated with the oil cavity 11 through the first hole 51.

First round pin axle 61 is established on slider 5, and first bearing 62 is cyclic annular and rotationally the cover establish on first round pin axle 61 outer peripheral face, prescribes a limit to first lubrication clearance between the outer peripheral face of first round pin axle 61 and the internal face of first bearing 62, and first round pin axle 61 has third hole 63, and lubrication chamber 14, second hole 52, third hole 63 and first lubrication clearance communicate in proper order. The first end 71 of the connecting rod 7 is connected with the first bearing 62, and the second end 72 of the connecting rod 7 is matched with the spindle assembly 2 so as to drive the connecting rod 7 to move when the spindle assembly 2 rotates.

The present invention is based on the discovery and recognition by the inventors of the following facts and problems: in the related art, after the bearing and the pin shaft are well matched, lubricating oil in the pump body enters the gap between the pin shaft and the bearing from the two sides of the gap between the pin shaft and the bearing, and 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 less, the lubricating oil entering the gap between the lubricating bearing and the pin shaft is less, and the lubricating effect between the pin shaft and the bearing is poor.

The plunger pump 100 according to the embodiment of the present invention is configured such that the first hole 51 and the second hole 52 are provided in the slider 5, the third hole 63 is provided in the first pin 61, the lubrication chamber 14 and the oil chamber 11 communicate with each other through the first hole 51, and the lubrication chamber 14, the second hole 52, the third hole 63, and the first lubrication gap communicate with each other in this order. Therefore, when the rotating shaft assembly 2 rotates and the connecting rod 7 moves, namely the rotating shaft assembly 2 drives the plunger assembly (the sliding block 5) to do reciprocating motion, lubricating oil in the oil cavity 11 can enter the lubricating cavity 14 through the first hole 51, the lubricating oil in the lubricating cavity 14 can sequentially pass through the second hole 52 and the third hole 63 to enter the first lubricating gap (between the first pin shaft 61 and the first bearing 62), and therefore the lubricating effect between the first pin shaft 61 and the first bearing 62 is good, and the normal operation of the plunger pump 100 is guaranteed.

Therefore, the plunger pump 100 according to the embodiment of the present invention has advantages of good lubrication effect and convenience in normal operation.

As shown in fig. 1 to 5, a plunger pump 100 according to an embodiment of the present invention includes a pump body 1, a rotary shaft assembly 2, and a plunger assembly.

The pump body 1 is provided with an oil chamber 11, a plunger chamber 12 and a working chamber 13. The oil cavity 11 can be used for containing lubricating oil, the pump body 1 is provided with a pump cover for sealing the oil cavity 11, and the oil cavity 11, the plunger cavity 12 and the working cavity 13 are sequentially arranged in the radial direction of the pump body 1. Specifically, the oil chamber 11 is located in the middle of the pump body 1, the plunger chambers 12 and the working chambers 13 are both multiple, the plunger chambers 12 are communicated with the working chambers 13 in a one-to-one correspondence manner, and each plunger chamber 12 is communicated with the oil chamber 11. Two plunger chambers 12 arranged at intervals in the axial direction of the pump body 1 form a plunger chamber group, and a plurality of plunger chamber groups are arranged at intervals in 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 plurality of plunger chambers 12 and the plurality of working chambers 13 may extend in the up-down direction, which is indicated by arrows in fig. 1 and 2.

The rotating shaft component 2 is arranged in the oil cavity 11, and the rotating shaft component 2 can rotate 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 plunger assembly to reciprocate, and lubricating oil in the oil cavity 11 can lubricate the rotating shaft assembly 2. The axial direction of the rotating shaft component 2 (the rotating shaft 21) is the axial direction of the pump body 1.

As shown in fig. 1 to 5, the plunger assembly includes a plunger 4, a slider 5, a first pin 61, a first bearing 62, and a link 7. The plunger assembly is provided in plurality, and the plunger assemblies are matched with the plunger cavities 12 and the working cavities 13 in a one-to-one correspondence manner, so that the plunger 4 in each working cavity 13 can reciprocate along the radial direction of the pump body 1.

At least part of the plunger 4 is movably arranged in the working chamber 13 in the radial direction of the pump body 1. Specifically, a sealing member 15 sleeved on the periphery of the plunger 4 is arranged in each working cavity 13, so that the working cavity 13 and the plunger cavity 12 can be separated by the plunger 4 and the sealing member 15, and when the plunger 4 reciprocates in the working cavity 13, the working medium in the working cavity 13 is not easy to enter the plunger cavity 12 and the oil cavity 11.

The slide block 5 is movably arranged in the plunger cavity 12 along the radial direction of the pump body 1, the slide block 5 is connected with the plunger 4, the slide block 5 and the wall surface of the plunger cavity 12 define a lubricating cavity 14, and the volume of the lubricating cavity 14 can be changed when the slide block 5 moves. Specifically, a sleeve 16 is provided in the pump body 1, the inner wall surface of the sleeve 16 defines the side wall surface of the plunger chamber 12, and the end surface of the seal 15 facing the plunger chamber 12, the wall surface of the plunger chamber 12 (the inner wall surface of the sleeve 16), and the end surface of the slider 5 facing the working chamber 13 define the lubricating oil chamber 11. The end face of the slide 5 facing the working chamber 13 has a recess, so that the volume of the lubrication chamber 14 can be increased.

The slider 5 has a first hole 51 and a second hole 52, and the lubrication chamber 14 and the oil chamber 11 communicate through the first hole 51. Specifically, each of the first hole 51 and the second hole 52 is plural, the first hole 51 and the second hole 52 each extend in the radial direction of the pump body 1, and the first hole 51 penetrates the slider 5 so that the lubrication chamber 14 and the oil chamber 11 communicate through the first hole 51. When the slider 5 moves toward the adjacent oil chamber 11 (the rotary shaft assembly 2) in the radial direction of the pump body 1, the volume of the lubrication chamber 14 can be increased and the lubricant in the oil chamber 11 can be facilitated to enter the lubrication chamber 14 through the first hole 51. When the slider 5 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 14 can be reduced, so that a part of the lubricating oil in the lubrication chamber 14 enters the oil chamber 11 through the first hole 51 and a part of the lubricating oil can enter the second hole 52.

As shown in fig. 1 to 5, the first pin 61 is disposed on the slider 5, the first bearing 62 is annular and rotatably sleeved on the outer peripheral surface of the first pin 61, and a first lubrication gap is defined between the outer peripheral surface of the first pin 61 and the inner wall surface of the first bearing 62. The first pin 61 has a third bore 63, the lubrication chamber 14, the second bore 52, the third bore 63 and the first lubrication gap communicating in sequence. Specifically, the slider 5 has a pin shaft hole 53 penetrating therethrough, the first pin shaft 61 is provided in the pin shaft hole 53, and the axial direction of the pin shaft hole 53 and the axial direction of the first pin shaft 61 coincide with the axial direction of the pump body 1. The wall surface of the plunger chamber 12, the wall surface of the pin shaft hole 53, and the end surface of the first pin shaft 61 define a lubricating oil chamber 54, and the second hole 52 and the third hole 63 communicate through the lubricating oil chamber 54. Thereby, the lubricating oil that has entered the second bore 52 can be made to enter the lubricating oil chamber 54 and then enter the first lubricating clearance through the third bore 63, thereby improving the lubricating effect of the first pin shaft 61 and the first bearing 62.

The lubricating oil chambers 54 are two in number, and each lubricating oil chamber 54 has the second hole 52 and the third hole 63 communicating therewith. In particular, two lubricating oil chambers 54 may be formed in each plunger cavity 12 with the slider 5 and the first pin 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 in the axial direction of the first pin 61 and communicates with the lubricating oil chamber 54 (at both ends of the first sub-hole 64, respectively), the second sub-hole 65 extends in the radial direction of the pump body 1, and the second sub-hole 65 is provided on the outer peripheral surface of the first pin and communicates with the first sub-hole 64. Thereby, the lubricating oil in the lubricating oil chamber 54 can be made to enter the first lubricating gap sequentially through the first sub-hole 64 and the second sub-hole 65. At least one second sub-aperture 65. Optionally, the second sub-holes 65 are multiple and arranged at intervals along the circumference of the first pin 61.

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 coincident with the radial direction of the pump body 1, 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 sequentially arranged along the circumferential direction of the slider.

As shown in fig. 1 to 5, the first end portion 71 of the connecting rod 7 is connected to the first bearing 62, and the second end portion 72 of the connecting rod 7 is engaged with the spindle assembly 2 to drive the connecting rod 7 to move when the spindle assembly 2 rotates. Specifically, at least one of the inner wall surface of the first bearing 62 and the outer peripheral surface of the first pin 61 is provided with at least one first groove 84, and the first groove 84 constitutes at least part of the first lubrication gap. Thereby, the first groove 84 can be made to become an oil reservoir in the first lubrication gap, so that the first lubrication gap is easily filled with lubricating oil, thereby increasing the lubricating effect. For example, the inner wall surface of the first bearing 62 is provided with a first groove 84, the inner wall surface of the first bearing 62 is provided with first oil distribution grooves located on both sides of the first groove 84 in the axial direction of the first bearing 62, and the first oil distribution grooves communicate with the first groove 84.

As shown in fig. 1 and 2, in some embodiments, a star wheel 23 is disposed in the oil chamber 11, the second ends 72 of the plurality of links 7 are connected to the star wheel 23, and the star wheel 23 is rotatably mounted on the spindle assembly 2 to drive the plunger assembly to move when the spindle 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, the connecting rods 7 can be driven to move, the sliding blocks 5 connected with the connecting rods 7 and the plungers 4 connected with the sliding blocks 5 are driven to perform reciprocating motion in the radial direction of the pump body 1, and therefore working media can be sucked into and discharged out of the working chamber 13.

As shown in fig. 1 to 3, in some embodiments, the plunger pump 100 includes a second pin 81 and a second bearing 82, the second pin 81 is disposed on the star wheel 23, the second bearing 82 is annular and rotatably disposed on an outer circumferential surface of the second pin 81, the second end portion 72 of the connecting rod 7 is connected to the second bearing 82, and a second lubrication gap is defined between an outer circumferential surface of the second pin 81 and an inner wall surface of the second bearing 82.

As shown in fig. 1 to 3, the plurality of links 7 comprises a main link and a plurality of secondary links, a first end 71 of the main link being rotatably connected to the slider 5 by means of the first pin 61 and the first bearing 62, and a second end 72 of the main link being fixedly connected to the star wheel 23.

The first end 71 of the secondary link is pivotally connected to the slider 5 via the first pin 61 and the first bearing 62, and the second end 72 of the secondary link 7 is connected to the second bearing 82. Specifically, the first end 71 of the secondary link is disposed over the outer peripheral surface of the first bearing 62, and the first end 71 of the secondary link and the outer peripheral surface of the first bearing 62 define a second groove 85. At least one of the inner wall surface of the second bearing 82 and the outer circumferential surface of the second pin 81 is provided with at least one third groove 86, and the third groove 86 forms at least part of the second lubrication gap. The second end 72 of the secondary link is disposed over the outer peripheral surface of the second bearing 82, and the second end 72 of the secondary link and the outer peripheral surface of the second bearing 82 define a fourth groove 87. For example, the inner wall surface of the second bearing 82 is provided with a third groove 86, the inner wall surface of the second bearing 82 is provided with second oil sumps 88 located on both sides of the third groove 86 on the second bearing 82, and the second oil sumps 88 communicate with the third groove 86.

The first bearing 62 has a fourth hole penetrating the first bearing 62 in the radial direction of the first bearing 62, the sub link (link 7) has a fifth hole 73, the second bearing 82 has a sixth hole 83, and the sixth hole 83 penetrates the second bearing 82 in 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 sequentially communicated, so that the first lubrication gap, the fourth hole, the fifth hole 73, the sixth hole 83, and the second lubrication gap are sequentially communicated. Therefore, the lubricating oil in the lubricating cavity 14 can fill the first lubricating gap and the second lubricating gap, so that the lubricating effect between the first pin shaft 61 and the first bearing 62 is good, and the lubricating effect between the second pin shaft 81 and the second bearing 82 is good.

In some embodiments, the star wheel 23 has a star wheel hole that extends through the star wheel 23 in the axial direction of the pump body 1, the second pin 81 is provided in the star wheel 23 hole, the second pin 81 has a seventh hole, and the second lubrication gap communicates with the oil chamber 11 through the seventh hole 84. Thereby, the second lubrication gap and the lubricating oil in the oil chamber 11 can be made to flow each other.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

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

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although the above embodiments have been shown and described, it should be understood that they are exemplary and should not be construed as limiting the present invention, and that many changes, modifications, substitutions and alterations to the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (10)

1. The utility model provides a plunger pump, its characterized in that, includes the pump body, pivot subassembly and plunger subassembly, the pump body is equipped with oil pocket, plunger chamber and working chamber, the oil pocket can be used to place lubricating oil, be equipped with on the pump body and be used for the closing cap the pump cover of oil pocket, the oil pocket the plunger chamber with the working chamber is in the footpath of the pump body sets gradually, the pivot subassembly is established in the oil pocket, the pivot subassembly for the pump body is rotatable, the plunger subassembly includes:

a plunger, at least part of which is movably arranged in the working cavity along the radial direction of the pump body;

the sliding block is movably arranged in the plunger cavity along the radial direction of the pump body, the sliding block is connected with the plunger, a lubricating cavity is defined by the sliding block and the wall surface of the plunger cavity, the volume of the lubricating cavity can be changed when the sliding block moves, the sliding block is provided with a first hole and a second hole, and the lubricating cavity is communicated with the oil cavity through the first hole,

the first pin shaft is arranged on the sliding block, the first bearing is annular and is rotatably sleeved on the outer peripheral surface of the first pin shaft, a first lubricating gap is defined between the outer peripheral 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 lubricating cavity, the second hole, the third hole and the first lubricating gap are sequentially communicated;

and the first end part of the connecting rod is connected with the first bearing, and the second end part of the connecting rod is matched with the rotating shaft component so as to be suitable for driving the connecting rod to move when the rotating shaft component rotates.

2. The plunger pump according to claim 1, wherein the slider has a pin shaft hole extending therethrough, the first pin shaft is provided in the pin shaft hole, an axial direction of the first pin shaft, and an axial direction of the pump body are coincident, 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 lubricating oil chamber, and the second hole and the third hole are communicated through the lubricating oil chamber.

3. The plunger pump of claim 2, wherein the first and second bores are each plural, and the lubricating oil chamber is two, each of the lubricating oil chambers having the second and third bores communicating therewith.

4. The plunger pump according to claim 3, wherein the third hole includes a first sub-hole that penetrates the first pin in the axial direction of the first pin shaft and communicates with the lubricating oil chamber, and a second sub-hole that extends in the radial direction of the pump body, the second sub-hole being opened in the outer peripheral surface of the first pin and communicates with the first sub-hole, the second sub-hole being at least one.

5. The plunger pump of claim 2, wherein there are a plurality of said plunger chambers and said working chambers, said plurality of said plunger chambers communicating with said plurality of said working chambers in a one-to-one correspondence;

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

the oil chamber is internally provided with a star wheel, the second end parts 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.

6. The plunger pump of claim 5,

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 can be sleeved on the peripheral surface of the second pin shaft in a rotating mode, the second end of the connecting rod is connected with the second bearing, and a second lubricating gap is defined between the peripheral surface of the second pin shaft and the inner wall surface of the second bearing;

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

7. The plunger pump according to claim 6, wherein at least one of an inner wall surface of the first bearing and an outer peripheral surface of the first pin shaft is provided with at least one first groove, and the first groove constitutes at least part of the first lubrication gap.

8. The plunger pump of claim 7,

the first end of the auxiliary connecting rod is sleeved on the peripheral surface of the first bearing, and a second groove is defined by the first end of the auxiliary connecting rod and the peripheral surface of the first bearing;

the utility model discloses a lubricated clearance of second, including first hole, second pin axle, second recess, first recess, second hole, second groove, second recess, second hole, second recess, second hole, third recess, second hole, fourth recess, first recess, sixth hole and third recess communicate in proper order, be equipped with the third recess on at least one of the internal face of second bearing and the outer peripheral face of second pin axle, the third recess constitutes at least part in second lubricated clearance, vice connecting rod the second tip with the fourth recess is injectd to the outer peripheral face of second bearing, first recess the third recess with the fourth recess is the annular, the third hole the second recess the fifth hole the fourth recess the sixth hole with the third recess communicates in proper order.

9. The plunger pump of claim 6, wherein the star wheel has 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 formed in the second pin shaft, and the second lubricating gap is communicated with the oil cavity through the seventh hole.

10. The plunger pump according to any one of claims 1-9, wherein each of said working chambers is provided with a sealing member fitted around said plunger, said sealing member defining said lubricating oil chamber with an end surface facing said plunger chamber, a wall surface of said plunger chamber, and an end surface of said slider facing said working chamber.

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