CN115045817A

CN115045817A - Plunger pump

Info

Publication number: CN115045817A
Application number: CN202210770032.4A
Authority: CN
Inventors: 刘昊; 韦文术; 耿翔宇; 李然; 李东泽; 于天亮; 叶健; 陈荣明
Original assignee: Beijing Meike Tianma Automation Technology Co Ltd; Beijing Tianma Intelligent Control Technology Co Ltd
Current assignee: Beijing Meike Tianma Automation Technology Co Ltd; Beijing Tianma Intelligent Control Technology Co Ltd
Priority date: 2022-07-01
Filing date: 2022-07-01
Publication date: 2022-09-13
Also published as: WO2024000832A1

Abstract

The invention discloses a plunger pump which comprises a pump body, a crankshaft and a plunger group, wherein the pump body is provided with a plurality of working cavities; the crankshaft is rotatably assembled on the pump body and provided with an eccentric section, and the axis of the eccentric section is parallel to the axis of the crankshaft and arranged at intervals; plunger group is including a plurality of plungers and star gear, and is a plurality of the plunger is followed the circumference interval arrangement of star gear, the one end of plunger with the star gear links to each other, the other end direction of plunger assemble in work appearance chamber is in order to be suitable for the adjustment work appearance chamber's volume, the star gear rotationally assemble in eccentric section, in order to be suitable for the drive when the bent axle rotates the plunger is in work appearance intracavity slides. The plunger pump provided by the embodiment of the invention has the advantage of larger rated flow.

Description

Plunger pump

Technical Field

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

Background

The plunger pump realizes oil absorption and oil pressing by means of the volume change of the sealed working cavity through the reciprocating motion of the plunger in the cylinder body. The radial plunger pump is a plunger pump with the reciprocating direction of a piston or a plunger vertical to a driving shaft, and has the advantages of low noise, high working pressure and the like. The radial plunger pump in the related art has a low rated flow rate.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the embodiment of the invention provides the plunger pump which has the advantage of high rated flow.

The plunger pump comprises a pump body, wherein the pump body is provided with a plurality of working cavities; the crankshaft is rotatably assembled on the pump body and provided with an eccentric section, and the axis of the eccentric section is parallel to the axis of the crankshaft and arranged at intervals; plunger group, plunger group is including a plurality of plungers and star gear, and is a plurality of the plunger is followed the circumference interval arrangement of star gear, the one end of plunger with the star gear links to each other, the other end direction of plunger assemble in work holds the chamber in order to be suitable for the adjustment the volume that work held the chamber, the star gear rotationally assemble in eccentric section is in order to be suitable for the drive when the bent axle rotates the plunger is in work holds the intracavity and slides.

The plunger pump provided by the embodiment of the invention has the advantage of larger rated flow.

In some embodiments, there are a plurality of the plunger sets, there are a plurality of the eccentric sections, the plurality of the eccentric sections correspond to the plurality of the plunger sets one by one, the plurality of the eccentric sections are arranged at intervals along the length direction of the crankshaft, and a set deflection angle is formed between two adjacent eccentric sections.

In some embodiments, the crankshaft includes a collar disposed between two adjacent eccentric sections, the collar extending coaxially with the crankshaft, a radial dimension of the collar being greater than a sum of the radial dimension of the eccentric sections and an eccentricity of the eccentric sections.

In some embodiments, the plunger pump includes a driver having an end portion of the crankshaft extending out of the pump body and forming an extension section, the driver being adapted to be coupled to the extension section to drive the crankshaft in rotation.

In some embodiments, the star wheel and the eccentric section extend coaxially, a first hole and a plurality of second holes are formed in the star wheel, the second holes are arranged at intervals along the outer peripheral side of the first hole, the first hole and the second holes extend along the axial direction of the star wheel, the eccentric section is rotatably assembled in the first hole, and the second holes correspond to the plungers one to one so that the plungers can be connected with the star wheel.

In some embodiments, the plunger assembly includes a plurality of piston portions and a plurality of connecting rods, one end of each connecting rod is assembled in the second hole, the other end of each connecting rod is rotatably connected with the corresponding piston portion, the plungers are arranged at the ends, facing away from the corresponding connecting rods, of the piston portions, and the piston portions are slidably assembled on the pump body.

In some embodiments, the pump body includes a plurality of sleeve groups, the plurality of sleeve groups correspond to the plunger groups one to one, the sleeve group includes a plurality of sleeves arranged at intervals in a circumferential direction of the crankshaft, the sleeves extend in a radial direction of the crankshaft, the piston portions correspond to the sleeves one to one, and the piston portions are guide-fitted in the sleeves.

In some embodiments, the plurality of links includes a main link and a plurality of sub-links, one end of the main link is fixedly connected to the star wheel, the other end of the main link is rotatably connected to the piston portion, one end of the sub-link is rotatably mounted to the second hole, and the other end of the sub-link is rotatably connected to the piston portion.

In some embodiments, the main links of a plurality of said plunger sets extend at an included angle.

In some embodiments, the pump body includes a plurality of housings arranged in parallel at intervals in an axial direction of the crankshaft, the plunger groups are fitted to the housings, and the plurality of housings correspond one-to-one to the plurality of plunger groups.

Drawings

Fig. 1 is a schematic cross-sectional view of a plunger pump according to an embodiment of the present invention.

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

FIG. 3 is a schematic view of a star wheel of a plunger pump according to an embodiment of the present invention.

Fig. 4 is a schematic view of a crankshaft of the plunger pump according to the embodiment of the present invention.

Fig. 5 is a schematic structural view of a plunger pump according to an embodiment of the present invention.

Reference numerals:

a pump body 1; a working volume 11; an assembly space 12; a sleeve 13; a housing 14; a valve body 141;

a crankshaft 2; an eccentric section 21; a first section 211; a second section 212; a collar 22; an epitaxial segment 23;

a plunger set 3; a first plunger set 301; a second plunger set 302; a plunger 31; a star wheel 32; a connecting rod 33; a master link 331; the sub link 332; a piston portion 34.

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 according to an embodiment of the present invention will be described below with reference to fig. 1 to 4.

The plunger pump of the embodiment of the invention comprises a pump body 1, a crankshaft 2 and a plurality of plunger sets 3.

The pump body 1 is provided with a plurality of working chambers 11. Specifically, an assembly space 12 is arranged in the pump body 1, the working accommodating cavity 11 is communicated with the assembly space 12, the nominal size of the inner diameter of the working accommodating cavity 11 is the same as the nominal size of the outer diameter of the plunger 31, so that the plunger 31 can be in transition fit with the working accommodating cavity 11, and the plunger 31 is in sealing fit with the working accommodating cavity 11.

The crankshaft 2 is rotatably assembled to the pump body 1, and the crankshaft 2 is provided with an eccentric section 21, and the axis of the eccentric section 21 is arranged in parallel with the axis of the crankshaft 2 at a spacing. Specifically, the crankshaft 2 includes a shaft core, the shaft core of the crankshaft 2 extends in the front-rear direction, the shaft core of the crankshaft 2 is rotatably fitted in the fitting space 12, the eccentric section 21 is disposed on the outer peripheral side of the shaft core, the extending direction of the eccentric section 21 is the same as the extending direction of the crankshaft 2, the radius of the eccentric section 21 is larger than the radius of the shaft core of the crankshaft 2, the distance between the axis of the eccentric section 21 and the axis of the crankshaft 2 is the eccentricity of the eccentric section 21, and the eccentricity of the eccentric section 21 is smaller than the radius of the shaft core.

The plurality of plunger groups 3 are arranged at intervals in the eccentric section 21 along the length direction of the crankshaft 2, each plunger group 3 comprises a plurality of plungers 31 and a star wheel 32, the plurality of plungers 31 are arranged at intervals along the circumferential direction of the star wheel 32, one end of each plunger 31 is connected with the star wheel 32, the plungers 31 are assembled in the working cavities 11 in a guiding mode to be suitable for adjusting the volume of the working cavities 11, and the eccentric sections 21 are assembled in the star wheel 32 in a rotating mode to be suitable for driving the plungers 31 to slide in the working cavities 11 when the crankshaft 2 rotates.

Specifically, a plurality of plunger groups 3 are arranged in parallel at intervals in the front-rear direction, each plunger group 3 includes a plurality of plungers 31 and a star wheel 32, the star wheel 32 is of an annular structure, the star wheel 32 extends in the front-rear direction, the star wheel 32 is rotatably assembled on the outer peripheral side of the eccentric section 21, the star wheel 32 is rotatable relative to the eccentric section 21, the plungers 31 are located on the outer peripheral side of the star wheel 32, the plungers 31 are arranged at intervals in the circumferential direction of the crankshafts 2, and the intervals between any two adjacent crankshafts 2 are the same.

According to the plunger pump provided by the embodiment of the invention, the plurality of plunger groups 3 are arranged on the crankshaft 2, the plurality of plungers 31 are arranged in each plunger group 3, the plurality of plungers 31 are matched with the working accommodating cavity 11 of the pump body 1, when the crankshaft 2 rotates, the star wheel 32 eccentrically rotates along with the eccentric shaft to drive the plungers 31 to slide in the working accommodating cavities 11 in a guiding manner, so that the volumes of the plurality of working accommodating cavities 11 are periodically changed along with the rotation of the crankshaft 2, oil is sequentially sucked into the plurality of working accommodating cavities 11 and then discharged, and the plurality of plungers 31 are matched to move, so that the rated flow of the plunger pump provided by the embodiment of the invention is increased, and the plunger pump provided by the embodiment of the invention has the advantage of larger rated flow.

In some embodiments, there are a plurality of eccentric sections 21, the plurality of eccentric sections 21 correspond to the plurality of plunger sets 3 one by one, the plurality of eccentric sections 21 are arranged at intervals along the length direction of the crankshaft 2, and a set deflection angle is formed between two adjacent eccentric sections 21.

Specifically, the plurality of eccentric sections 21 are arranged at intervals along the front-rear direction, the eccentricity and the radius of the plurality of eccentric sections 21 are the same, the plurality of eccentric sections 21 include a first section 211 and a second section 212, and a line connecting a projection of the axis of the first section 211 in the front-rear direction and a projection of the axis of the crankshaft 2 in the front-rear direction and a line connecting a projection of the axis of the second section in the front-rear direction and a projection of the axis of the crankshaft 2 in the front-rear direction have an included angle, so that a set deflection angle is provided between the first section 211 and the second section 212.

Therefore, the plurality of eccentric sections 21 are arranged, and the plurality of eccentric sections 21 correspond to the plurality of plunger groups 3 one to one, so that the crankshaft 2 keeps dynamic balance when rotating, the vibration amplitude of the plunger pump in the embodiment of the invention in operation is reduced, and the noise of the plunger pump in the embodiment of the invention in operation is reduced.

In some embodiments, the crankshaft 2 includes a collar 22, the collar 22 is disposed between two adjacent eccentric sections 21, the collar 22 extends coaxially with the crankshaft 2, and a radial dimension of the collar 22 is greater than a sum of the radial dimension of the eccentric sections 21 and an eccentricity of the eccentric sections 21.

Specifically, the plurality of collars 22 are provided between the first section 211 and the second section 212, the collars 22 are provided on the outer peripheral side of the shaft core of the crankshaft 2, the collars 22 extend coaxially with the shaft core of the crankshaft 2, the radius of the outer ring of the collars 22 is larger than the sum of the radius and the eccentricity of the eccentric sections 21, and the projection of the eccentric sections 21 in the front-rear direction completely falls within the projection of the collars 22 in the front-rear direction.

Therefore, on the one hand, the collar 22 is provided between the first section 211 and the second section 212, so that the plunger group 3 corresponding to the first section 211 and the plunger group 3 corresponding to the second section 212 are prevented from interfering with each other when the plunger pump of the embodiment of the present invention is operated, and on the other hand, when the plunger group 3 is mounted on the eccentric section 21, the plunger group 3 abuts against the front end surface or the rear end surface of the collar 22, so that the plunger group 3 is positioned in the front-rear direction.

In some embodiments, the plunger pump comprises a driver, the end of the crankshaft 2 protruding out of the pump body 1 and forming an extension 23, the driver being adapted to be connected to the extension 23 to drive the crankshaft 2 in rotation.

Specifically, the driver is the motor, and the front end of bent axle 2 stretches out pump body 1 and forms epitaxial section 23, and the periphery of epitaxial section 23 is equipped with the spline, and epitaxial section 23 passes through the spline fit with the output shaft of motor.

Therefore, the driver is connected with the extension section 23 to drive the crankshaft 2 to rotate, and the plurality of eccentric sections 21 are arranged on the crankshaft 2 and the plurality of plunger groups 3 can be installed, so that when the driver drives the crankshaft 2 to rotate, the driver can simultaneously drive the plurality of plungers 31 of the plurality of plunger groups 3 to move in the corresponding working cavities 11 in a guiding manner, the volumes of the plurality of working cavities 11 can be simultaneously changed, and the rated flow of the plunger pump in the embodiment of the invention is improved.

In some embodiments, the star wheel 32 extends coaxially with the eccentric section 21, a first hole and a plurality of second holes are formed in the star wheel 32, the plurality of second holes are arranged at intervals along the outer peripheral side of the first hole, the first hole and the second holes extend along the axial direction of the star wheel 32, the eccentric section 21 is rotatably assembled in the first hole, and the plurality of second holes correspond to the plungers 31 one by one so that the plurality of plungers 31 can be connected with the star wheel 32.

Specifically, the axis of the star wheel 32 coincides with the axis of the corresponding eccentric section 21, the inner ring of the star wheel 32 is rotatably connected with the outer ring of the eccentric section 21, the inner ring of the star wheel 32 forms a first hole, the first hole is a through hole, and a bearing is arranged between the inner wall of the first hole and the outer ring of the eccentric section 21, so that the friction effect between the star wheel 32 and the eccentric section 21 is reduced.

The plurality of second holes are uniformly arranged at intervals along the outer peripheral side of the first hole, the extending direction of the second holes is the same as the axial direction of the star wheel 32, the second holes are through holes penetrating through the front end and the rear end of the star wheel 32, the plunger 31 is connected with the star wheel 32 through the second holes corresponding to the plunger 31, and the plunger 31 can swing along the axis of the second holes corresponding to the plunger 31.

Therefore, the eccentric section 21 is rotatably assembled in the first hole, the outer peripheral side of the eccentric section 21 is in contact with the inner wall surface of the first hole, the contact area between the crankshaft 2 and the star wheel 32 is increased, the friction effect between the crankshaft 2 and the star wheel 32 is reduced, and the stability of the plunger pump in the embodiment of the invention during operation is improved.

In some embodiments, the plunger set 3 includes a plurality of piston portions 34 and a plurality of connecting rods 33, one end of the connecting rod 33 is assembled in the second hole, the other end of the connecting rod 33 is rotatably connected with the piston portion 34, the plunger 31 is arranged at one end of the piston portion 34 facing away from the connecting rod 33, and the piston portion 34 is slidably assembled to the pump body 1.

Specifically, a plurality of piston portions 34 correspond to a plurality of plungers 31 one to one, a plurality of connecting rods 33 correspond to a plurality of plungers 31 one to one, one end of the plunger 31 is fitted to the working accommodating chamber 11, the other end of the plunger 31 is connected to the piston portion 34 corresponding thereto, the extending direction of the piston portion 34 is the same as the extending direction of the connecting rod 33, the pump body 1 is provided with a piston cavity, the piston cavity is arranged on one side of the working accommodating chamber 11 close to the assembling space 12, the piston cavity corresponds to the working accommodating chamber 11 one to one, and the piston cavity and the working accommodating chamber 11 corresponding thereto extend coaxially.

Therefore, the piston part 34 extends coaxially with the plunger 31, and the piston part is guided and matched with the piston cavity, so that on one hand, the guiding performance of the plunger 31 in the working cavity 11 is improved, on the other hand, the diameter of the piston part is larger than that of the plunger 31, when the piston part and plunger 31 combined body receives radial force, the radial force is borne by the piston part, and the matching precision of the plunger 31 in the working cavity 11 is improved.

In some embodiments, the pump body 1 includes a plurality of sets of sleeves 13, the plurality of sets of sleeves 13 correspond to the plunger sets 3 one by one, the plurality of sleeves 13 are arranged at intervals in the circumferential direction of the crankshaft 2 in the sets of sleeves 13, the sleeves 13 extend in the radial direction of the crankshaft 2, the piston portions correspond to the sleeves 13 one by one, and the piston portions are guided and fitted in the sleeves 13.

Specifically, the position of sleeve 13 group in the front and back direction coincides with the position of plunger group 3 in the front and back direction that corresponds to it, and sleeve 13 group includes a plurality of sleeves 13, and sleeve 13 links to each other with pump body 1 detachable, and a plurality of sleeves 13 and a plurality of piston portion one-to-one correspond, and the inner chamber of sleeve 13 forms the piston chamber, and piston portion guide cooperation is in with sleeve 13.

Therefore, on one hand, the piston part is in sliding fit with the sleeve 13, the sleeve 13 can be detached and is convenient to replace after the sleeve 13 is worn, so that the service life of the plunger pump provided by the embodiment of the invention is prolonged, and on the other hand, the sleeve 13 is small in size and easy to control machining precision, so that the fit precision between the pump body 1 and the piston part is improved.

In some embodiments, as shown in fig. 5, the pump body 1 includes a plurality of housings 14, the plurality of housings 14 are arranged in parallel along the axial direction of the crankshaft 2, the plunger group 3 is fitted to the housings 14, and the plurality of housings 14 correspond to the plurality of plunger groups 3 one to one.

Specifically, the housing 14 is annular, the housing 14 extends in a closed manner along the circumferential direction of the crankshaft 2, a through hole is formed in the housing 14, the through hole penetrates through the housing 14 along the extending direction of the crankshaft 2, the crankshaft 2 is rotatably fitted in the through hole, the through holes of the plurality of housings 14 are arranged in the axial direction of the crankshaft to form the assembly space 12, the star wheel 32 of the plunger set 3 corresponding to the housing 14 is fitted between the crankshaft 2 and the housing 14, a plurality of valve bodies 141 are arranged on the outer circumferential side of the housing 14, the plurality of valve bodies 141 are in one-to-one correspondence with the plurality of working accommodating chambers 11, the working accommodating chambers 11 are arranged in the valve bodies 141, the sleeve 13 is arranged between the working accommodating chambers 11 and the crankshaft 2, the piston portion 34 of the plunger set 3 corresponding to the housing 14 is fitted in the sleeve 13, and the plunger 31 of the plunger set 3 corresponding to the housing 14 is fitted in the working accommodating chamber 11.

Therefore, the plurality of shells 14 are spliced to form the pump body 1, on one hand, the pump body 1 can be disassembled along the axial direction of the crankshaft 2 so as to be convenient for maintaining the plunger pump of the embodiment of the invention, and on the other hand, the pump body 1 can be spliced along the axial direction of the crankshaft 2 so as to be convenient for assembling the pump body 1 and the plurality of plunger groups 3 on the crankshaft 2.

In some embodiments, the plurality of links 33 includes a main link 331 and a plurality of sub links 332, one end of the main link 331 is fixedly connected to the star wheel 32, the other end of the main link 331 is rotatably connected to the piston portion, one end of the sub links 332 is rotatably fitted to the second hole, and the other end of the sub links 332 is rotatably connected to the piston portion.

Specifically, each plunger set 3 includes a plurality of connecting rods 33, each of the plurality of connecting rods 33 in each plunger set 3 has a main connecting rod 331, the remaining connecting rods 33 are sub-connecting rods 332, the main connecting rod 331 is fixedly connected with the star wheel 32, the sub-connecting rods 332 are rotatably connected with the star wheel 32, the main connecting rod 331 is rotatably connected with the piston portion, and the sub-connecting rods 332 are rotatably connected with the piston portion.

Therefore, the star wheel 32 can only do translational circular motion around the rotating shaft of the crankshaft 2 in the assembling space 12, so that the star wheel 32 is prevented from doing circular motion in the assembling space 12, and the rotational motion of the crankshaft 2 is completely converted into the translational motion of the plunger 31 in the working cavity 11.

In some embodiments, the main links 331 of the plurality of plunger sets 3 extend at an angle.

Specifically, the plurality of plunger groups 3 include a first plunger group 301 and a second plunger group 302, and a projection of an extending direction of the main link 331 of the first plunger group 301 and an extending direction of the main link 331 of the second plunger group 302 in the front-rear direction has an angle.

Therefore, when the plunger pump according to the embodiment of the present invention operates, the main link 331 receives a large radial force, the extending direction of the main link 331 of the first plunger group 301 is different from the extending direction of the main link 331 of the second plunger group 302, and the force receiving direction of the main link 331 of the first plunger group 301 is different from the force receiving direction of the main link 331 of the second plunger group 302, so that the vibration amplitude of the plunger pump according to the embodiment of the present invention during operation is reduced.

In some embodiments, the number of plungers 31 in the plunger set 3 is odd.

Specifically, there are seven plungers 31 in the plunger group 3, and the seven plungers 31 are arranged at regular intervals along the circumferential direction of the crankshaft 2. Therefore, the odd number of the plungers 31 are arranged in the plunger group 3, on one hand, when the crankshaft 2 rotates, the rotating power of the crankshaft 2 can be uniformly transmitted to each plunger 31, and on the other hand, the star wheel 32 is prevented from making pure translation motion in the assembling space 12, so that the vibration amplitude of the plunger pump in the embodiment of the invention during working is reduced.

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 of the 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," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate 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

1. A plunger pump, comprising:

the pump body is provided with a plurality of working cavities;

the crankshaft is rotatably assembled on the pump body and provided with an eccentric section, and the axis of the eccentric section is parallel to the axis of the crankshaft and arranged at intervals;

plunger group, plunger group is including a plurality of plungers and star gear, and is a plurality of the plunger is followed the circumference interval arrangement of star gear, the one end of plunger with the star gear links to each other, the other end direction of plunger assemble in work holds the chamber in order to be suitable for the adjustment the volume that work held the chamber, the star gear rotationally assemble in eccentric section is in order to be suitable for the drive when the bent axle rotates the plunger is in work holds the intracavity and slides.

2. The plunger pump of claim 1, wherein the plunger set is plural, the eccentric section is plural, the eccentric sections are in one-to-one correspondence with the plunger sets, the eccentric sections are spaced along the length direction of the crankshaft, and a set deflection angle is provided between two adjacent eccentric sections.

3. The plunger pump of claim 2, wherein the crankshaft includes a collar disposed between adjacent two of the eccentric sections, the collar extending coaxially with the crankshaft, the collar having a radial dimension greater than a sum of the radial dimension of the eccentric sections and the eccentricity of the eccentric sections.

4. The plunger pump of claim 2, including a driver having an end portion extending out of the pump body and forming an extension, the driver being adapted to be connected to the extension to drive the crankshaft in rotation.

5. The plunger pump of claim 1, wherein the star wheel extends coaxially with the eccentric section, a first hole and a plurality of second holes are formed in the star wheel, the second holes are arranged at intervals along the outer peripheral side of the first hole, the first hole and the second holes extend in the axial direction of the star wheel, the eccentric section is rotatably assembled in the first hole, and the second holes correspond to the plungers one to one so that the plungers are connected with the star wheel.

6. The plunger pump of claim 5, wherein the plunger assembly includes a plurality of piston portions and a plurality of connecting rods, one end of the connecting rod is mounted to the second bore, the other end of the connecting rod is rotatably connected to the piston portion, the plunger is disposed at an end of the piston portion facing away from the connecting rod, and the piston portion is slidably mounted to the pump body.

7. The plunger pump according to claim 6, wherein the pump body includes a plurality of sleeve groups, a plurality of the sleeve groups correspond one-to-one to the plunger groups, the sleeve group includes a plurality of sleeves arranged at intervals in a circumferential direction of the crankshaft, the sleeves extend in a radial direction of the crankshaft, the piston portions correspond one-to-one to the sleeves, and the piston portions are guide-fitted in the sleeves.

8. The plunger pump of claim 7, wherein the plurality of links includes a main link and a plurality of sub links, the main link having one end fixedly connected to the star wheel and the other end rotatably connected to the piston portion, the sub link having one end rotatably fitted to the second bore and the other end rotatably connected to the piston portion.

9. The plunger pump of claim 8, wherein the main links of a plurality of said plunger sets extend at an included angle.

10. The plunger pump according to any one of claims 1-9, wherein the pump body includes a plurality of housings arranged in parallel at intervals in an axial direction of the crankshaft, the plunger groups are fitted to the housings, and the plurality of housings correspond one-to-one to the plurality of plunger groups.