CN210949004U

CN210949004U - Radial plunger pump and plunger pair thereof

Info

Publication number: CN210949004U
Application number: CN201921305766.5U
Authority: CN
Inventors: 程辉
Original assignee: Dezhou Sheng Hui Hydraulic Co ltd
Current assignee: Dezhou Sheng Hui Hydraulic Co ltd
Priority date: 2019-08-13
Filing date: 2019-08-13
Publication date: 2020-07-07
Anticipated expiration: 2029-08-13

Abstract

A radial plunger pump and a plunger pair thereof, the radial plunger pump comprises at least one plunger pair, the plunger pair comprises a plunger body, a plunger hole is arranged in the plunger body, the top end of the plunger body is provided with an oil inlet hole and communicated with the plunger hole, and one side of the plunger body is provided with a plunger oil outlet and communicated with the plunger hole; the plunger rod is installed in the plunger hole and moves in the plunger hole in a reciprocating mode along the axis direction; the pressure spring pad is arranged at one end of the plunger rod; the two ends of the return spring are respectively abutted against the outer wall of the plunger body and the pressure spring pad; and the plunger oil inlet mechanism is arranged in the oil inlet hole and is fixed through a detachable connecting piece, and comprises a one-way oil absorption retainer, the one-way oil absorption retainer faces the plunger hole and is positioned at the joint of the oil inlet hole and the plunger hole, and a one-way oil absorption valve block is arranged between the one-way oil absorption retainer and the one-way oil absorption valve block.

Description

Radial plunger pump and plunger pair thereof

Technical Field

The utility model relates to a superhigh pressure hydraulic power take off, especially a radial plunger pump and plunger pair thereof for superhigh pressure hydraulic pressure.

Background

The radial plunger pump is a plunger pump with the plunger reciprocating direction vertical to the driving direction, has the characteristics of low noise, high working pressure, stable performance, high volumetric efficiency and the like, and is widely applied to the field of ultrahigh-pressure hydraulic power output. However, the radial plunger pump in the prior art mainly has the following defects, thereby affecting the safe application and the working efficiency of the radial plunger pump:

1) the plunger of the plunger pair deforms the plunger body through external force so as to lock the valve seat valve plate into the plunger body, and if the hydraulic oil is not clean, the valve seat valve plate of the plunger is damaged, the whole plunger is completely scrapped and cannot be maintained;

2) the plunger body is usually fixed by two plunger pins, and when the use pressure is increased, the offset load pressure borne by the plunger body is increased, so that the plunger pins are easy to break to cause damage to the plunger body and the plunger rod;

3) the fastening screw of the plunger is arranged outside the plunger body, and a large gap is formed between the fastening screw and the plunger body;

4) the plunger is easy to be locked with the plunger body in the assembling process, the plunger body is stressed to deform the plunger rod hole in the assembling process, and the plunger rod hole and the plunger rod are changed from clearance fit into interference fit to ensure that the plunger rod cannot realize reciprocating linear motion;

5) when the plunger is used, the plunger rod automatically rotates due to the fact that reciprocating linear motion of the plunger rod and the plunger body is too fast, and the plunger spring can be broken due to increased friction between the plunger spring and the plunger body;

6) the oil filter screen of the plunger body is an embedded oil filter screen, the oil filter area is small, the pump head can block the oil filter screen to empty the plunger due to excessive impurities in hydraulic oil when the pump head works for a long time, and the oil supply amount of the pump body can be unstable.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to the above-mentioned defect of prior art, a radial plunger pump and plunger pair thereof for superhigh pressure hydraulic pressure is provided.

In order to achieve the above object, the utility model provides a plunger pair of radial plunger pump installs in the casing of radial plunger pump, wherein, the plunger pair includes:

the plunger piston comprises a plunger piston body, wherein the plunger piston body is provided with an oil inlet hole and a plunger piston oil outlet, the plunger piston body is internally provided with a plunger piston hole, the oil inlet hole is formed in the top end of the plunger piston body and is communicated with the plunger piston hole, and the plunger piston oil outlet is formed in one side of the plunger piston body and is communicated with the plunger piston hole;

one end of the plunger rod is arranged in the plunger hole and is coaxial with the plunger hole;

the pressure spring pad is arranged at the other end of the plunger rod;

the two ends of the return spring are respectively abutted against the outer wall of the plunger body and the pressure spring pad; and

the plunger oil inlet mechanism is arranged in the oil inlet hole and fixed through a detachable connecting piece, the plunger oil inlet mechanism comprises a one-way oil absorption retainer, the one-way oil absorption retainer faces the plunger hole and is located at the joint of the oil inlet hole and the plunger hole, and a one-way oil absorption valve plate is arranged between the one-way oil absorption retainer and the one-way oil absorption valve plate.

In the plunger pair of the radial plunger pump, the detachable connecting piece is an inner hexagonal plug screw, the inner hexagonal plug screw is in threaded connection with the mounting hole at the top of the plunger body, and the bottom of the inner hexagonal plug screw is pressed against the one-way oil absorption valve seat.

The plunger pair of the radial plunger pump comprises a plunger body and a plunger resetting part, wherein the plunger body comprises an installation part and a plunger resetting part which are sequentially connected, the installation part comprises two symmetrical installation bosses, installation holes are respectively formed in the installation bosses, assembling surfaces are arranged on the installation bosses corresponding to the installation holes, and the plunger body is connected with a shell of the radial plunger pump through the assembling surfaces.

The plunger pair of the radial plunger pump is characterized in that the mounting part is further provided with a force-reducing groove, and the force-reducing groove penetrates through the mounting part and is located between the two symmetrically arranged mounting bosses.

In the plunger pair of the radial plunger pump, the plunger reset portion is a cylinder coaxial with the plunger hole, and the width of the purgation groove is greater than or equal to the diameter of the plunger reset portion.

The plunger pair of the radial plunger pump is characterized in that a reset boss is arranged between the mounting part and the plunger reset part, two ends of the reset spring are respectively abutted against the reset boss and the pressure spring pad, and the spring pad is further arranged between the reset spring and the reset boss.

The plunger pair of the radial plunger pump is characterized in that the plunger oil outlet is formed in the mounting portion, the mounting portion is further provided with a one-way valve hole used for mounting an oil outlet one-way valve, the one-way valve hole is coaxial with the plunger oil outlet, and the oil outlet one-way valve is tightly matched and connected with the plunger body through the one-way valve hole.

The plunger pair of the radial plunger pump further comprises an oil absorption filter screen, the oil absorption filter screen is mounted at the top end of the mounting part and covers the outer side of the detachable connecting piece, and the ratio of the oil filtering area of the oil absorption filter screen to the top area of the mounting part is larger than or equal to 70%.

In order to better achieve the above object, the present invention further provides a radial plunger pump, wherein, including:

the oil way disc and the fixed disc are respectively and correspondingly provided with a bearing hole, the oil way disc is provided with at least one oil way and at least one oil outlet, and the oil way is connected with the oil outlet;

the transmission shaft is supported and installed in bearing holes of the oil way disc and the fixed disc through a fixed bearing, and an eccentric bearing is installed on the transmission shaft; and

each layer of plunger mechanism comprises at least one plunger pair, the plunger pairs are the plunger pairs, and the plunger body is clamped between the oil way disc and the fixed disc and is connected with the oil way disc and the fixed disc through a connecting piece; the tail end of the plunger rod abuts against the eccentric bearing and reciprocates in the plunger hole along with the rotation of the eccentric bearing; the plunger oil outlet is communicated with the oil way on the oil way disc, and the plunger oil inlet mechanism is communicated with an external oil way.

In the above radial plunger pump, each layer of the plunger mechanism includes a plurality of the plunger pairs, the plurality of the plunger pairs are arranged in an axisymmetric or centrosymmetric manner with respect to the axis of the transmission shaft, and the axes of the plurality of the plunger pairs are located on the same plane and perpendicularly intersect with the axis of the transmission shaft.

The technical effects of the utility model reside in that:

the radial plunger pump of the utility model can ensure that the pressure of the fixed plunger pair fixed by the fixed disc is dispersed, effectively reduce the deformation of the plunger body, and ensure that the plunger body is not easy to deform, thereby ensuring that the radial plunger pump can work more stably; the plunger pair is convenient to disassemble, so that the assembly and maintenance cost is reduced; the plunger piston body can better bear the offset load force brought by the rise of the use pressure; the problem that the plunger body and the plunger rod are scrapped due to the breakage of the plunger pin is solved; the situation that the reset spring breaks is avoided; the phenomenon of plunger suction caused by excessive hydraulic oil impurities is avoided. The radial plunger pump is composed of valve-matched star-shaped plunger column pairs, can realize larger flow output by the parallel configuration of the plunger column pairs with different numbers, is suitable for all hydraulic systems, can be installed outside an oil tank and can be soaked in hydraulic oil as a power source of the hydraulic systems, and the highest pressure of the radial plunger pump can reach 70 Mpa. The device has the characteristics of low noise, high working pressure, stable performance, high volume efficiency and the like, can work in 1400-2800r/min, and greatly improves the use efficiency.

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.

Drawings

Fig. 1 is a schematic structural view of a radial plunger pump according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

fig. 3 is a schematic structural view of a plunger pair according to an embodiment of the present invention;

FIG. 4 is a top view of FIG. 3;

fig. 5 is a sectional view B-B of fig. 3.

Wherein the reference numerals

1 oil way plate

11 oil outlet

2 fixed disk

3 eccentric bearing

4 fixed bearing

5 drive shaft

51 oil seal

52 eccentric washer

6 plunger pair

61 plunger body

611 plunger hole

612 oil inlet

613 plunger oil outlet

614 one-way valve hole

615 mounting part

616 mounting boss

617 mounting hole

618 purgative trough

619 plunger reset part

62 plunger rod

63 pressure spring pad

64 return spring

65 spring cushion

66 plunger oil inlet mechanism

661 one-way oil suction valve seat

662 one-way oil suction valve plate

663 one-way oil suction retainer

664 sealing gasket

67 detachable connecting piece

68 oil suction filter screen

69 Screen retainer

7 connecting piece

8 oil filter screen

9 oil filter screen fixing piece

10 oil outlet one-way valve

Detailed Description

The following describes the structural and operational principles of the present invention in detail with reference to the accompanying drawings:

referring to fig. 1 and 2, fig. 1 is a schematic structural view of a radial plunger pump according to an embodiment of the present invention, and fig. 2 is a sectional view taken along line a-a of fig. 1. The utility model discloses a radial plunger pump, include: the oil way disc 1 and the fixed disc 2 are respectively and correspondingly provided with a bearing hole, the oil way disc 1 is provided with at least one oil way and at least one oil outlet 11, and a plurality of oil ways and a plurality of oil outlets 11 can be arranged according to requirements, and the oil ways are connected with the oil outlets 11; the transmission shaft 5 is supported and installed in bearing holes of the oil circuit disc 1 and the fixed disc 2 through a fixed bearing 4, an eccentric bearing 3 is installed on the transmission shaft 5, the transmission shaft 5 drives the eccentric bearing 3 to synchronously rotate, an eccentric gasket 52 is arranged between the eccentric bearing 3 and the fixed bearing 4, and an oil seal 51 is further arranged in the installation hole of the oil circuit disc 1 on one side of the output end of the transmission shaft 5 and positioned on the outer side of the fixed bearing 4; each layer of plunger mechanism comprises at least one plunger pair 6, the number of the layers of the plunger mechanisms and the number of the plunger pairs 6 in each layer can be set according to requirements, for example, the number of the plunger pairs 6 in each layer can be respectively 2, 3, 4, 5, 6, 7, 8, 10, 12, 14 and the like, each plunger pair 6 comprises a plunger body 61 and a plunger rod 62, and the plunger body 61 is clamped between the oil way disc 1 and the fixed disc 2 and is connected with the oil way disc 1 and the fixed disc 2 through a connecting piece 7; the end of the plunger rod 62 abuts against the eccentric bearing 3 and reciprocates in the plunger hole 611 with the rotation of the eccentric bearing 3; the plunger oil outlet 613 is communicated with an oil way on the oil way disc 1 through the oil outlet one-way valve 10, and the plunger oil inlet mechanism 66 is communicated with an external oil way.

In this embodiment, each layer of the plunger mechanism includes a plurality of (6 shown in fig. 1) plunger pairs 6, the plurality of plunger pairs 6 are preferably arranged axisymmetrically or centrosymmetrically around the axis of the transmission shaft 5, the axes of the plurality of plunger pairs 6 are located on the same plane, and the axis of each plunger pair 6 is perpendicular to the axis of the transmission shaft 5, that is, the plurality of plunger pairs 6 are arranged in a star-shaped radial uniform arrangement. The plurality of plunger pairs 6 can be arranged in parallel or independently, for example, 6 oil outlets 11 can be correspondingly arranged on 6 plunger pairs 6 respectively. The plunger piston mechanism can also comprise a plurality of layers of plunger piston mechanisms, wherein each layer of plunger piston mechanism is arranged in parallel, and the plunger piston pair 6 of each layer is correspondingly and parallelly superposed between the oil path disc 1 and the fixed disc 2 and is fixedly connected with the oil path disc 1 and the fixed disc 2 together through a connecting piece 7. The radial plunger pump can be installed outside an oil tank or used by being soaked in hydraulic oil. When the plunger oil inlet mechanism 66 of the plunger pair 6 sucks hydraulic oil in the annular space and conveys the hydraulic oil to the oil outlet 11 through an oil path arranged in the oil path disc 1; when the radial plunger pump is soaked in hydraulic oil, an oil filter screen 8 (see fig. 2) can be arranged on the radial plunger pump, the oil filter screen 8 is installed on the fixed disc 2 through an oil filter screen fixing part 9, and the hydraulic oil enters the plunger oil inlet mechanism 66 of the plunger pair 6 after penetrating through the oil filter screen 8 and is conveyed to the oil outlet 11 through an oil path arranged in the oil path disc 1.

When the plunger pair hydraulic oil pump works, the external power source is connected with the transmission shaft 5, the transmission shaft 5 drives the eccentric bearing 3 to rotate through the rotation of the external power source, so that the plunger pair 6 works, hydraulic oil is sucked through the plunger oil inlet mechanism 66 of the plunger pair 6 at the moment, flows into an oil way of the oil way disc 1 through the oil outlet one-way valve 10, and finally flows out through the oil outlet 11. The external power source is preferably an electric motor, and the transmission shaft 5 can be connected with the electric motor through a flange and a coupling and driven by the electric motor. Because the constitution, structure, mutual position relation, the relation of connection and function etc. of this radial plunger pump other parts are more ripe prior art, so do not do the repeated description here, it is only right below the utility model discloses a plunger pair 6 gives detailed description.

Referring to fig. 3-5, fig. 3 is a schematic structural view of a plunger pair 6 according to an embodiment of the present invention, fig. 4 is a top view of fig. 3, and fig. 5 is a sectional view of B-B of fig. 3. The utility model discloses a radial plunger pump's plunger pair 6 is mainly used for fluid delivery in the pump body, installs in radial plunger pump's casing, press from both sides to establish certainly and fix between the oil circuit dish 1 and the fixed disk 2 of casing, plunger pair 6 includes: the plunger body 61, the plunger body 61 is provided with an oil inlet hole 612 and a plunger oil outlet 613, the plunger body 61 is internally provided with a plunger hole 611, the oil inlet hole 612 is arranged at the top end of the plunger body 61 and is communicated with the plunger hole 611, and the plunger oil outlet 613 is arranged at one side of the plunger body 61 and is communicated with the plunger hole 611; a plunger rod 62 having one end mounted in the plunger hole 611 and disposed coaxially with the plunger hole 611, the plunger rod 62 reciprocating in the plunger hole 611 in the axial direction; a pressure spring pad 63 installed at the other end of the plunger rod 62; a return spring 64, both ends of which respectively abut against the outer wall of the plunger body 61 and the pressure spring pad 63, for returning the plunger rod 62; and the plunger oil inlet mechanism 66 is arranged in the oil inlet 612 and fixed through a detachable connecting piece 67, the plunger oil inlet mechanism 66 comprises a one-way oil suction retainer 663 and a one-way oil suction valve seat 661, the one-way oil suction retainer 663 faces the plunger hole 611 and is arranged at the joint of the oil inlet 612 and the plunger hole 611, and a one-way oil suction valve plate 662 is arranged between the one-way oil suction valve seat 661 and the one-way oil suction retainer 663.

The detachable connecting piece 67 is preferably an inner hexagonal plug, the inner hexagonal plug is in threaded connection with the mounting hole at the top of the plunger body 61, and the bottom of the inner hexagonal plug is pressed against the one-way oil suction valve seat 661. A sealing gasket 664 is preferably arranged between the inner hexagonal plug and the one-way oil suction valve seat 661, and the sealing gasket 664 is preferably a sealing copper gasket. The plunger oil inlet mechanism 66 is convenient to detach due to the arrangement of the detachable connecting piece 67, the maintenance cost is reduced, the one-way oil suction valve seat 661 and the one-way oil suction valve plate 662 are fixed in the plunger body 61 in a plug screw locking mode, and the one-way oil suction valve seat 661, the one-way oil suction valve plate 662 and the one-way oil suction retainer 663 can be conveniently maintained and replaced only by unscrewing the inner hexagonal wrench during maintenance.

In this embodiment, the plunger body 61 includes a mounting portion 615 and a plunger reset portion 619 that are sequentially connected, the plunger reset portion 619 is preferably a cylinder that is coaxial with the plunger hole 611, the mounting portion 615 is preferably a rectangular cylinder, the mounting bosses 616 are disposed on the left and right sides of the rectangular cylinder, preferably the two mounting bosses 616 are disposed in bilateral symmetry, at least one mounting hole 617 is disposed on each of the mounting bosses 616, the mounting holes 617 are also preferably disposed in symmetry, the axes of the mounting holes 617 are parallel to each other and perpendicular to the axis of the plunger hole 611, the front and rear sides of the mounting bosses 616 are provided with mounting surfaces corresponding to the mounting holes 617, preferably the entire boss planes on the front and rear sides of the mounting bosses 616 are used as mounting surfaces, and the plunger body 61 is connected to the housing of the radial plunger pump through the mounting surfaces. That is, the assembly surface on one side of the plunger body 61 is attached to the mounting surface of the oil circuit disc 1, the assembly surface on the other side is attached to the mounting surface of the fixed disc 2, the assembly surfaces on the left side and the right side of the plunger body 61 are located on the same plane, the assembly surfaces on the front side and the rear side are parallel to each other, and the surface processing precision of the four assembly surfaces meets the assembly requirement of the radial plunger pump. The plunger body 61 is fixed between the oil path disk 1 and the fixed disk 2 through the mounting hole 617 by a coupling member 7 (preferably, a fastening screw). I.e., the fastening screw passes through and is located within the plunger body 61, so that the plunger body 61 can better withstand an increase in the offset load force caused by an increase in the use pressure. This installation boss 616's cross sectional shape can set up to the rectangle as required, and is semi-circular, and unilateral or bilateral right angle of unilateral or bilateral corner cut rectangle or rectangle sets up to the arc angle etc. as long as this installation boss 616 can guarantee the assembly quality, fixes the plunger body 61 better, guarantees that the plunger is vice 6 in the use, and vice 6 of plunger can not pop out because of the extrusion that the high pressure received eccentric bearing 3, avoids causing the safety in production hidden danger, does not have the restriction to its concrete structure.

The mounting portion 615 of this embodiment is further provided with a force-releasing groove 618, and the force-releasing groove 618 penetrates through the mounting portion 615 along the axial direction of the plunger hole 611 and is located between the two symmetrically arranged mounting bosses 616. The width of the purgative groove 618 is preferably greater than or equal to the diameter of the plunger reset 619. The bottom surface of the purgative groove 618 is slightly lower than the assembly surfaces on the left and right sides, and preferably, the entire middle portion of the plunger body 61 except the assembly surfaces is provided as the purgative groove 618. This power groove 618's setting of running off can guarantee that the fixed disk 2 presss from both sides the pressure of fixed plunger body 61 and is dispersed, effectively prevents the deformation that the assembly process center pillar consent 611 produced for the deformation volume of plunger body 61 is little, is difficult for producing the deformation, thereby can guarantee smooth installation of plunger rod 62 and can not produce the phenomenon that can't smoothly remove such as the card pause or locking because of the deformation of this plunger hole 611 in the course of the work, makes warp-wise plunger pump can work more steadily.

A reset flange is arranged between the mounting part 615 and the plunger reset part 619 of the present embodiment, that is, the side length of the rectangular cylinder of the mounting part 615 is slightly larger than the diameter of the cylinder of the plunger reset part 619, and two ends of the reset spring 64 respectively abut against the reset flange and the pressure spring pad 63. A spring pad 65 can be further arranged between the return spring 64 and the return flange, the spring pad 65 is tightly attached to the return flange, two ends of the return spring 64 are respectively abutted against the spring pad 65 and the pressure spring pad 63, and the spring pad 65 can reduce friction between the return spring 64 and the return flange of the plunger body 61 when the plunger rod 62 and the plunger body 61 do reciprocating linear motion, so that the generation of broken springs is avoided.

The plunger oil outlet 613 is arranged on the mounting portion 615, the mounting portion 615 is further provided with a one-way valve hole 614 for mounting the oil outlet one-way valve 10, the one-way valve hole 614 is coaxially arranged with the plunger oil outlet 613, and the oil outlet one-way valve 10 is tightly matched and connected with the plunger body 61 through the one-way valve hole 614 to bear offset load pressure. That is, by lengthening the length of the valve body of the oil outlet check valve 10, the oil outlet check valve 10 not only has the function of guiding the hydraulic oil in the plunger pair 6 out to the oil path of the oil path disc 1, but also can be used as a connecting and fixing part of the plunger body 61 and the oil path disc 1, for example, the oil outlet check valve 10 with the diameter of 10mm can be tightly matched with the plunger body 61, and after the use pressure is increased, the oil outlet check valve 10 bears the unbalance loading pressure, so that the problem that the plunger body 61 and the plunger rod 62 are scrapped due to the fact that the plunger pin is easy to break when the pressure is increased because the plunger pin is used for connecting the plunger body 61 and the oil path disc 1 in the prior art is solved.

The embodiment can further include an oil suction filter screen 68, which is installed on the top end of the installation part 615 through an oil suction fixing part 69 and covers the outside of the detachable connecting part 67, that is, the oil suction filter screen 68 is located outside the plunger oil suction mechanism 66 and completely covers the top of the installation part 615 of the whole plunger body 61, so that the effective oil suction area of the oil suction filter screen 68 is maximized in a limited space, the ratio of the oil suction area of the oil suction filter screen 68 to the whole top area of the installation part 615 is greater than or equal to 70% and is far greater than the effective oil suction area of the oil filter screen in the prior art (the oil filter screen in the prior art is an embedded structure and is limited by an oil suction valve structure, the effective oil suction area of the oil suction filter screen 68 is less than 30% of the whole top area), the oil suction filter area of the oil suction filter screen 68 is effectively increased, the plunger is easy to be sucked due to accumulation of hydraulic oil impurities.

In operation, when the plunger rod 62 moves outwards under the action of the return spring 64, the oil inlet valve of the plunger oil inlet mechanism 66 is opened, and meanwhile, the valve of the oil outlet check valve 10 installed at the plunger oil outlet 613 is closed, so that fluid is sucked into the plunger body 61; when the plunger rod 62 reaches the maximum stroke position, the eccentric bearing 3 pushes the plunger rod 62 inwards at the moment, the oil inlet valve of the plunger oil inlet mechanism 66 is closed, the valve of the oil outlet one-way valve 10 is opened, fluid sucked in the plunger body 61 is sent out, reaches the oil outlet 11 through the oil path of the oil path disc 1, and is finally conveyed to a target mechanism. The plunger rod 62 reciprocates continuously within the plunger body 61 and fluid is continuously delivered to the target mechanism. Referring to fig. 2, in this embodiment, when the plunger pair 6 is used by being soaked in hydraulic oil, when the plunger rod 62 is pressed down by an external force generated by the eccentric bearing 3, the fluid in the plunger body 61 is discharged through the plunger oil outlet 613, when the eccentric bearing 3 rotates to a position with a smaller radius, no pressure is generated on the plunger rod 62, the plunger rod 62 is jacked up by the return spring 64, because the internal pressure is higher than the external pressure, the one-way oil suction valve seat 661 and the one-way oil suction valve sheet 662 are opened, the hydraulic oil is filtered by the oil filter screen 8, then filtered by the oil suction filter screen 68, and finally enters the plunger hole 611 through the one-way oil suction valve seat 661 and the one-. The eccentric bearing 3 is driven by the transmission shaft 5 to rotate ceaselessly, the plunger rod 62 does ceaselessly reciprocating movement in the plunger hole 611, the hydraulic oil is continuously sucked into the plunger hole 611 and is finally conveyed to the oil outlet 11 of the oil path disc through the plunger oil outlet 613, and the conveying of the hydraulic oil is completed.

The following table shows the partial performance comparison of the radial plunger pump of the present invention with the prior art:

the utility model discloses a radial plunger pump is applicable to in the middle of all hydraulic system, as hydraulic system's power supply, and its highest pressure reaches 70 Mpa. The utility model discloses can set up a plurality of plungers of valve formula star arrangement vice (the structure that figure 1 shows that 6 plungers are vice, the individual layer sets up), through the vice parallelly connected configuration of the plunger of different numbers, realize great flow output. The structure of the plunger pair can enhance the volumetric efficiency of the radial plunger pump, reduce noise, prevent locking caused by excessive heat in the working process of the plunger, and prevent residues such as iron pins and the like from entering the plunger pair to cause damage. The device has the characteristics of low noise, high working pressure, stable performance, high volumetric efficiency and the like. The device can work at 1400-2800r/min, thereby greatly reducing the assembly, maintenance and use cost and effectively improving the production and use efficiency.

Naturally, the present invention can be embodied in many other forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be made by one skilled in the art without departing from the spirit or essential attributes thereof, and it is intended that all such changes and modifications be considered as within the scope of the appended claims.

Claims

1. A plunger pair for a radial plunger pump, mounted in a housing of the radial plunger pump, the plunger pair comprising:

the pressure spring pad is arranged at the other end of the plunger rod;

2. The plunger pair of a radial plunger pump according to claim 1, wherein the detachable connecting piece is an inner hexagonal plug, the inner hexagonal plug is in threaded connection with the mounting hole at the top of the plunger body, and the bottom of the inner hexagonal plug is pressed against the one-way oil suction valve seat.

3. The plunger pair of the radial plunger pump according to claim 1 or 2, wherein the plunger body comprises a mounting portion and a plunger reset portion which are sequentially connected, the mounting portion comprises two symmetrically arranged mounting bosses, mounting holes are respectively arranged on the mounting bosses, mounting surfaces are arranged on the mounting bosses corresponding to the mounting holes, and the plunger body is connected with the housing of the radial plunger pump through the mounting surfaces.

4. The plunger pair of a radial plunger pump of claim 3, wherein the mounting portion is further provided with a purgation groove extending therethrough and located between the two symmetrically disposed mounting bosses.

5. The plunger pair of a radial plunger pump of claim 4, wherein said plunger return is a cylinder coaxial with said plunger bore, and said purgative channel has a width greater than or equal to a diameter of said plunger return.

6. The plunger pair of a radial plunger pump according to claim 3, wherein a reset boss is provided between the mounting portion and the plunger reset portion, both ends of the reset spring respectively abut against the reset boss and the compressed spring pad, and a spring pad is further provided between the reset spring and the reset boss.

7. The plunger pair of a radial plunger pump according to claim 3, wherein the plunger oil outlet is arranged at the mounting portion, the mounting portion is further provided with a one-way valve hole for mounting an oil outlet one-way valve, the one-way valve hole is coaxially arranged with the plunger oil outlet, and the oil outlet one-way valve is tightly connected with the plunger body through the one-way valve hole in a matched manner.

8. The plunger pair of a radial plunger pump according to claim 3, further comprising an oil suction strainer installed at a top end of the installation portion and covering an outside of the detachable connection member, wherein a ratio of an oil suction area of the oil suction strainer to a top area of the installation portion is 70% or more.

9. A radial piston pump, comprising:

at least one layer of plunger mechanism, wherein each layer of plunger mechanism comprises at least one plunger pair, the plunger pair is the plunger pair in any one of the claims 1-8, and the plunger body is clamped between the oil path disc and the fixed disc and is connected with the oil path disc and the fixed disc through a connecting piece; the tail end of the plunger rod abuts against the eccentric bearing and reciprocates in the plunger hole along with the rotation of the eccentric bearing; the plunger oil outlet is communicated with the oil way on the oil way disc, and the plunger oil inlet mechanism is communicated with an external oil way.

10. The radial plunger pump of claim 9, wherein each layer of the plunger mechanism comprises a plurality of the plunger pairs, the plurality of the plunger pairs are arranged in an axisymmetric or centrosymmetric manner with respect to the axis of the transmission shaft, and the axes of the plurality of the plunger pairs are located on the same plane and all perpendicularly intersect with the axis of the transmission shaft.