阅读说明：本技术 一种多层径向大流量高压多柱塞油泵装置 (multilayer radial large-flow high-pressure multi-plunger oil pump device ) 是由 毛剑峰 胡英豪 于 2019-08-05 设计创作，主要内容包括：本发明涉及柱塞泵技术领域,公开一种多层径向大流量高压多柱塞油泵装置,包括有：具有安装腔的泵体,泵体的外壁上开设有多个均与安装腔连通的第一安装孔、第二安装孔；第一安装孔和第二安装孔分层排布在泵体的高度方向上；泵体上还开设有进液口和出液口,进液口与安装腔连通,出液口与第一安装孔、第二安装孔均连通；多个柱塞组件,第一安装孔和第二安装孔中均设置有柱塞组件；柱塞组件包括有用于泵送液体的柱塞,柱塞具有伸向安装腔的自由端；驱动组件,包括偏心轴和电机；偏心轴穿设在安装腔中,且偏心轴可驱使柱塞做往复运动,以泵送液体。本发明的优点在于,本油泵装置的进油迅速,小扭矩输出大流量、高压力的压力油,且能耗低、效率高。(The invention relates to the technical field of plunger pumps, and discloses a multilayer radial large-flow high-pressure multi-plunger oil pump device, which comprises: the pump body is provided with an installation cavity, and the outer wall of the pump body is provided with a plurality of first installation holes and second installation holes which are communicated with the installation cavity; the first mounting holes and the second mounting holes are arranged in the height direction of the pump body in a layered mode; the pump body is also provided with a liquid inlet and a liquid outlet, the liquid inlet is communicated with the mounting cavity, and the liquid outlet is communicated with the first mounting hole and the second mounting hole; the first mounting hole and the second mounting hole are respectively provided with a plunger assembly; the plunger assembly comprises a plunger for pumping liquid, and the plunger is provided with a free end extending to the mounting cavity; the driving assembly comprises an eccentric shaft and a motor; the eccentric shaft penetrates through the installation cavity and can drive the plunger to do reciprocating motion so as to pump liquid. The oil pump device has the advantages of rapid oil inlet, low torque, large-flow and high-pressure output of pressure oil, low energy consumption and high efficiency.)

1. the utility model provides a radial big flow high pressure many plungers oil pump device of multilayer which characterized in that, including:

The pump body is provided with an installation cavity, and the outer wall of the pump body is provided with a plurality of first installation holes and second installation holes which are communicated with the installation cavity; the first mounting holes and the second mounting holes are arranged in the height direction of the pump body in a layered mode; the pump body is also provided with a liquid inlet and a liquid outlet, the liquid inlet is communicated with the mounting cavity, and the liquid outlet is communicated with the first mounting hole and the second mounting hole;

The plunger assemblies are arranged in the first mounting holes and the second mounting holes; the plunger assembly comprises a plunger for pumping liquid, and the plunger is provided with a free end extending to the mounting cavity;

the driving assembly comprises an eccentric shaft and a motor for driving the eccentric shaft; the eccentric shaft penetrates through the installation cavity and can drive the plunger to do reciprocating motion so as to pump liquid.

2. The multilayer radial high-flow high-pressure multi-plunger oil pump device according to claim 1, wherein the eccentric shaft is provided with at least two eccentric wheels arranged along the axial direction thereof; wherein there is an eccentric for driving the plunger mounted in said first mounting hole; there is another eccentric for driving a plunger mounted in the second mounting hole.

3. The multilayer radial high-flow high-pressure multi-plunger oil pump device according to claim 1 or 2, wherein the number of the eccentric wheels is two, and the eccentric shaft comprises a shaft body; the connecting line of the center of one eccentric wheel and the center of the shaft body is defined as a first straight line, the connecting line of the center of the other eccentric wheel and the center of the shaft body is defined as a second straight line, and the included angle between the first straight line and the second straight line is 180 degrees.

4. the multi-layer radial high-flow high-pressure multi-plunger oil pump device as claimed in claim 2, wherein a needle bearing is sleeved on the eccentric wheel, and the free end of the plunger abuts against the outer surface of the needle bearing.

5. The multilayer radial high-flow high-pressure multi-plunger oil pump device according to claim 1, wherein the pump body comprises a plurality of mounting parts distributed along the circumferential direction of the pump body, and two adjacent mounting parts are connected through a fillet; the first mounting hole and the second mounting hole are both arranged on the mounting portion, and the liquid inlet is arranged on the round angle.

6. the multilayer radial high-flow high-pressure multi-plunger oil pump device according to claim 5, wherein the mounting portions are rotationally symmetrically distributed, the rotation center of the mounting portions is the center line of the pump body, and the center of the first mounting hole and the center of the second mounting hole point to the center line of the pump body;

each fillet is provided with at least two liquid inlets, and the liquid inlets on the same fillet are arranged in layers along the height direction of the pump body; the center of the liquid inlet also points to the center line of the pump body.

7. the multi-layer radial large-flow high-pressure multi-plunger oil pump device according to claim 5, wherein the mounting portion is provided with a liquid inlet groove, and the liquid inlet groove is communicated with the first mounting hole and the second mounting hole.

8. The multilayer radial high-flow high-pressure multi-plunger oil pump device according to claim 5, wherein the first mounting hole and the second mounting hole each comprise a small hole section and a large hole section coaxially arranged with the small hole section;

the liquid outlet penetrates through the large hole section of the second mounting hole from the top of the mounting part downwards and is communicated with the large hole section of the first mounting hole; the diameter of liquid outlet is less than the diameter of inlet, and has two at least liquid outlets on each installation department.

9. the multilayer radial high-flow high-pressure multi-plunger oil pump device according to claim 8, characterized in that the plunger assembly further comprises a first elastic member, a check valve plate, a second elastic member and a plug head; the plunger, the first elastic piece, the one-way valve plate, the second elastic piece and the plug head are sequentially arranged from inside to outside relative to the installation cavity;

the check valve plate and the plug are arranged in the large hole section, and the check valve plate can move back and forth in the large hole section; the plunger is disposed in the small bore section; the first elastic piece is positioned between the plunger and the one-way valve plate; the second elastic piece is arranged between the one-way valve plate and the plug head.

10. the multilayer radial high-flow high-pressure multi-plunger oil pump device according to claim 9, wherein the plunger assembly further comprises a sealing member, the plunger head is provided with a sealing groove, and the sealing member is arranged in the sealing groove;

The overall dimension of the one-way valve plate is smaller than the aperture of the large hole section and larger than the aperture of the small hole section; a groove is formed in the side, close to the first elastic piece, of the one-way valve plate, and a raised head is arranged on the side, close to the second elastic piece, of the one-way valve plate; one end of the first elastic piece is arranged in the groove, and one end of the second elastic piece is sleeved on the convex head.

Technical Field

the invention relates to the technical field of plunger pumps, in particular to a multilayer radial large-flow high-pressure multi-plunger oil pump device.

Background

the plunger pump device mainly comprises an axial plunger pump and a radial plunger pump, and the volume of a pump cavity is changed through the reciprocating motion of a plunger, so that the effect of pumping liquid is realized, and further, the power can be provided for a machine. With the development of machines, the power requirement is higher and higher, and some large power devices can meet the use requirement only by pressure oil with large flow, high pressure and high efficiency.

The existing radial plunger pump mainly has the following problems: the plunger pump has small flow, and the pumping efficiency of the plunger pump is improved through the rapid rotation of the motor, so that the motor and the plunger pump generate heat seriously, and the motor is easy to have a high load.

For example, publication number "CN 109488548A" discloses a high-flow radial multi-plunger pump oil device, which includes a housing, a driving assembly, a plunger valve body, at least five plunger components, and a connecting portion. The drive assembly is fixed to the housing. The plunger valve body sets up in the casing, and the middle part of plunger valve body has the mounting hole, and in the eccentric wheel subassembly stretched into the mounting hole, the plunger valve body included five at least plunger installation departments that set up along its circumference evenly distributed, had the inlet port and the oil outlet in radial plunger hole and the radial plunger hole of intercommunication on each plunger installation department, and each radial plunger is downthehole to have an assembly boss. At least five plunger assemblies are respectively arranged in at least five radial plunger holes and are contacted with the rotating eccentric wheel assembly, and each plunger assembly comprises an oil slide switch. The connecting part is formed on the assembling boss and protrudes towards one side where the oil slide switch is located or is formed on the oil slide switch and protrudes towards one side where the assembling boss is located, and the area of the end face of the free end of the connecting part is smaller than the area of the step face of the assembling boss. The plunger pump improves the oil pumping capacity of the plunger pump to a certain extent, five plunger assemblies pump large-flow hydraulic oil, however, the oil pump device is only provided with one layer of plungers, the plungers at the same phase angle pump once oil every time the motor rotates for a circle, the oil pumping effect is not ideal, and the situation that oil inlet is not rapid enough can occur sometimes.

Aiming at the defects of the existing multi-plunger oil pump device, a multilayer radial large-flow high-pressure multi-plunger oil pump device with the advantages of rapid oil inlet, large output flow, high pressure, low energy consumption and high efficiency needs to be designed.

Disclosure of Invention

in order to overcome the defects in the prior art, the invention provides a multilayer radial large-flow high-pressure multi-plunger oil pump device which is rapid in oil inlet, large in output flow, high in pressure, low in energy consumption and high in efficiency.

The invention solves the technical problem and adopts the technical scheme that a multilayer radial large-flow high-pressure multi-plunger oil pump device is provided, which comprises:

The pump body is provided with an installation cavity, and the outer wall of the pump body is provided with a plurality of first installation holes and second installation holes which are communicated with the installation cavity; the first mounting holes and the second mounting holes are arranged in the height direction of the pump body in a layered mode; the pump body is also provided with a liquid inlet and a liquid outlet, the liquid inlet is communicated with the mounting cavity, and the liquid outlet is communicated with the first mounting hole and the second mounting hole;

The plunger assemblies are arranged in the first mounting holes and the second mounting holes; the plunger assembly comprises a plunger for pumping liquid, and the plunger is provided with a free end extending to the mounting cavity;

the driving assembly comprises an eccentric shaft and a motor for driving the eccentric shaft; the eccentric shaft penetrates through the installation cavity and can drive the plunger to do reciprocating motion so as to pump liquid.

Further, the eccentric shaft is provided with at least two eccentric wheels arranged along the axial direction of the eccentric shaft; wherein there is an eccentric for driving the plunger mounted in said first mounting hole; there is another eccentric for driving a plunger mounted in the second mounting hole.

furthermore, the number of the eccentric wheels is two, and the eccentric shaft comprises a shaft body; the connecting line of the center of one eccentric wheel and the center of the shaft body is defined as a first straight line, the connecting line of the center of the other eccentric wheel and the center of the shaft body is defined as a second straight line, and the included angle between the first straight line and the second straight line is 180 degrees.

Furthermore, a needle bearing is sleeved on the eccentric wheel, and the free end of the plunger abuts against the outer surface of the needle bearing.

Furthermore, the pump body comprises a plurality of mounting parts distributed along the circumferential direction of the pump body, and two adjacent mounting parts are connected through a fillet; the first mounting hole and the second mounting hole are both arranged on the mounting portion, and the liquid inlet is arranged on the round angle.

Furthermore, the installation parts are rotationally and symmetrically distributed, the rotation center of the installation parts is the center line of the pump body, and the center of the first installation hole and the center of the second installation hole point to the center line of the pump body;

Each fillet is provided with at least two liquid inlets, and the liquid inlets on the same fillet are arranged in layers along the height direction of the pump body; the center of the liquid inlet also points to the center line of the pump body.

further, a liquid inlet groove is formed in the mounting portion and communicated with the first mounting hole and the second mounting hole.

Furthermore, the first mounting hole and the second mounting hole respectively comprise a small hole section and a large hole section which is coaxially arranged with the small hole section;

The liquid outlet penetrates through the large hole section of the second mounting hole from the top of the mounting part downwards and is communicated with the large hole section of the first mounting hole; the diameter of liquid outlet is less than the diameter of inlet, and has two at least liquid outlets on each installation department.

Furthermore, the plunger assembly also comprises a first elastic piece, a one-way valve plate, a second elastic piece and a plug head; the plunger, the first elastic piece, the one-way valve plate, the second elastic piece and the plug head are sequentially arranged from inside to outside relative to the installation cavity;

The check valve plate and the plug are arranged in the large hole section, and the check valve plate can move back and forth in the large hole section; the plunger is disposed in the small bore section; the first elastic piece is positioned between the plunger and the one-way valve plate; the second elastic piece is arranged between the one-way valve plate and the plug head.

Furthermore, the plunger assembly further comprises a sealing element, a sealing groove is formed in the plug head, and the sealing element is arranged in the sealing groove;

the overall dimension of the one-way valve plate is smaller than the aperture of the large hole section and larger than the aperture of the small hole section; a groove is formed in the side, close to the first elastic piece, of the one-way valve plate, and a raised head is arranged on the side, close to the second elastic piece, of the one-way valve plate; one end of the first elastic piece is arranged in the groove, and one end of the second elastic piece is sleeved on the convex head.

Compared with the prior art, the invention has at least the following beneficial effects:

In the invention, a plurality of layers of holes are arranged on the pump body along the height direction of the pump body, namely, a first mounting hole and a second mounting hole are arranged in a layered mode, each layer of holes is driven by an eccentric wheel on an eccentric shaft, the number of the eccentric wheels is the same as the number of the layers of the holes, when a motor rotates for a circle, the eccentric shaft is driven to rotate for a circle, so that a plunger in the first mounting hole and a plunger in the second mounting hole on a phase are connected, and each oil pumping is carried out once, namely: when the motor rotates for one circle, the plunger in the first mounting hole and the plunger in the second mounting hole on the same phase respectively finish oil pumping once, namely oil pumping twice; compared with the existing plunger pump, the motor rotates for a circle, and the plungers in the same phase can pump oil only once; the oil pumping efficiency of the oil pump device is greatly improved; and the oil inlet groove are arranged for simultaneously feeding oil, so that the oil feeding efficiency is also high. In this scheme, only exemplify first mounting hole and second mounting hole two-layerly, can set up three-layer, four layers, five layers or more as required in reality, corresponding increase the quantity of eccentric wheel can, make the little moment of torsion of motor can output large-traffic, the hydraulic oil of big pressure, the pumping efficiency is high.

Drawings

FIG. 1 is a schematic view of an oil pump apparatus according to the present invention;

FIG. 2 is a schematic structural view of FIG. 1 with the filter plate removed;

FIG. 3 is an exploded view of FIG. 1;

FIG. 4 is an exploded view of the plunger assembly;

FIG. 5 is a schematic half-section view of the plunger assembly;

FIG. 6 is a schematic view of the pump body after installation of the plunger assembly therein;

FIG. 7 is a cross-sectional view taken along A-A of FIG. 6;

FIG. 8 is a schematic structural view of the pump body;

FIG. 9 is a cross-sectional view taken along line B-B of FIG. 8;

FIG. 10 is a cross-sectional view taken along line C-C of FIG. 8;

FIG. 11 is a schematic structural view of the eccentric shaft;

FIG. 12 is a schematic half-section view of the eccentric shaft;

FIG. 13 is a schematic plan view of the eccentric shaft;

Fig. 14 is a schematic view of the assembly of the eccentric shaft and the needle roller bearing.

In the figure, 1, a pump body; 10. an installation part; 11. round corners; 100. a mounting cavity; 101. a first mounting hole; 102. a second mounting hole; 103. a liquid outlet; 104. a liquid inlet tank; 105. a liquid inlet; 106. a fixing hole; 1011. a small pore section; 1012. a macroporous section; 2. a plunger assembly; 20. a plunger; 21. a first elastic member; 22. a one-way valve plate; 23. a second elastic member; 24. a plug head; 25. a seal member; 201. a first circular hole; 220. a groove; 221. a raised head; 240. a sealing groove; 241. a second circular hole; 3. a drive assembly; 30. an eccentric shaft; 31. a motor; 32. a needle bearing; 301. an eccentric wheel; 302. a first straight line; 303. a second straight line; 304. a polygonal hole; 310. an output shaft; 40. filtering the plate; 401. filtering holes; 41. a bolt; 42. a flange; 43. an open collar; 44. oil sealing; 45. and a bearing.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

as shown in fig. 1-3, a multilayer radial high-flow high-pressure multi-plunger oil pump device comprises: the pump body 1, the plunger assembly 2, the drive assembly 3 and the filter plate 40, screws 41 for fixing the filter plate, a flange 42 for mounting the motor 31, an opening collar 43, an oil seal 44 and a bearing 45.

As shown in fig. 3 and fig. 6 to 10, a pump body 1 having a mounting cavity 100 is provided, and a plurality of first mounting holes 101 and second mounting holes 102 both communicating with the mounting cavity 100 are formed in an outer wall of the pump body 1; the first mounting holes 101 and the second mounting holes 102 are arranged in a layered manner in the height direction of the pump body 1; the pump body 1 is further provided with a liquid inlet 105 and a liquid outlet 103, the liquid inlet 105 is communicated with the mounting cavity 100, the liquid outlet 103 is communicated with the first mounting hole 101 and the second mounting hole 102, hydraulic oil can enter the mounting cavity 100 from the liquid inlet 103, and the hydraulic oil is discharged from the liquid outlet 105 through the first mounting hole 101 and/or the second mounting hole 102 by pumping.

Preferably, the pump body 1 comprises a plurality of mounting parts 10 distributed along the circumferential direction of the pump body 1, and two adjacent mounting parts 10 are connected through a fillet 11; first mounting hole 101 and second mounting hole 102 all are in on installation department 10, and inlet 105 is in on fillet 11, and the height that inlet 105 set up corresponds with first mounting hole 101 and second mounting hole 102, convenient quick feed liquor. In the scheme, the number of the mounting parts 10 on the pump body 1 is three, but the number is not limited to three, and can be five, seven or more according to the requirement; the first mounting hole 101 and the second mounting hole 102 have the same structure, only the difference in height position exists, and the first mounting hole 101 and the second mounting hole 102 can be arranged into more layers according to the requirements of actual pumping flow and pumping pressure, and only the number of the eccentric wheels 301 on the eccentric shaft 30 needs to be correspondingly increased, so that the number of the eccentric wheels 301 is equal to the number of layers of the mounting holes.

The pumping flow and the pumping efficiency of the plunger oil pump device can be greatly improved through the eccentric wheel 301 and the plunger assembly 2 driven by the eccentric wheel; and the number of the mounting parts 10 does not need to be increased, so that the pump has compact structure and high space utilization rate.

Wherein, a plurality of installation departments 10 are rotational symmetry and distribute, and its rotation center is the central line of the pump body 1, promptly, installation department 10 equipartition is in the circumference of the pump body 1 for the processing of the pump body 1 is simple and convenient, and modes such as accessible wire-electrode cutting or milling process, and the center of first mounting hole 101 and the center of second mounting hole 102 all point to the central line of the pump body 1, like this when processing first mounting hole 101 and second mounting hole 102, can find with the central line of the pump body 1. At least two liquid inlets 105 are arranged on each round angle 11 between the pump bodies 1, the liquid inlets on the same round angle 105 are arranged in layers along the height direction of the pump body 1, the centers of the liquid inlets 105 also point to the center line of the pump body 1, and similarly, when the liquid inlets 105 are machined, the positions are conveniently found. Preferably, the installation portion 10 is provided with a liquid inlet groove 104, the liquid inlet groove 104 is communicated with the first installation hole 101 and the second installation hole 102, the liquid inlet groove 104 and the plurality of liquid inlets 105 are uniformly arranged to ensure the liquid inlet speed, and the liquid inlet speed is increased.

As shown in fig. 4-5 and 7, a plurality of plunger assemblies 2 are arranged in the first mounting hole 101 and the second mounting hole 102 on the pump body 1; the plunger assembly 2 comprises a plunger 20 for pumping liquid, the plunger 20 is provided with a free end extending to the mounting cavity 100 of the pump body 1, and the eccentric wheel 301 rotates to press the free end of the plunger 20 so as to enable the plunger 20 to reciprocate and extend in the first mounting hole 101 or the second mounting hole 102 to pump the liquid. The plunger assembly 2 further comprises a first elastic piece 21, a one-way valve plate 22, a second elastic piece 23 and a plug 24; the plunger 20, the first elastic piece 21, the one-way valve plate 22, the second elastic piece 23 and the plug 24 are arranged in sequence from inside to outside relative to the installation cavity 100; the check valve plate 22 and the plug 24 are arranged on the large hole section 1012 of the first mounting hole 101 or the large hole section 1012 of the second mounting hole 102, the check valve plate 22 can move back and forth in the large hole section 1012 to control the conduction and the closing of the liquid outlet 103, hydraulic oil pumped from the mounting cavity 100 can extrude the check valve plate 22 and is discharged from the liquid outlet 103, and enters the mounting cavity 100 from the liquid outlet 103, the check valve plate 22 separates the liquid outlet 103 from the first mounting hole 101/the second mounting hole 102 to prohibit the hydraulic oil from passing through, so that the arrangement of the check valve plate can prevent the reverse suction of the hydraulic oil, and the check valve plate is safe and reliable.

The plunger 20 is arranged in the small hole section 1011, and the first elastic piece 21 is positioned between the plunger 20 and the check valve piece 22; the second elastic element 23 is located between the check valve plate 22 and the plug 24. Specifically, the plunger 20 has a first circular hole 201, one end of the first elastic member 21 is disposed in the first circular hole 201, one side of the check valve plate 22 close to the first elastic member 21 has a groove 220, and the other end of the first elastic member 21 is disposed in the groove 220; one side of the check valve plate 22 close to the second elastic member 23 is provided with a protruding head 221, one end of the second elastic member 23 is sleeved on the protruding head 221, one side of the plug 24 close to the second elastic member 23 is provided with a second round hole 241, the other end of the second elastic member 23 is arranged in the second round hole 241, and the first elastic member 21 and the second elastic member 23 are both springs. In this way, the entire structure of the plunger assembly 2 is made compact, and the first elastic member 21 and the second elastic member 23 are not easily deformed, ensuring that the plunger 20 can reciprocate in the first mounting hole 101 and/or the second mounting hole 102.

As shown in fig. 1 to 3 and fig. 11 to 14, the driving assembly 3 includes an eccentric shaft 30 and a motor 31 for driving the eccentric shaft 30; an eccentric shaft 30 is inserted into the mounting chamber 100, and the eccentric shaft 30 drives the plunger 20 to reciprocate to pump the liquid. A polygonal hole 304 is formed at the bottom of the eccentric shaft 30, and the output shaft 310 of the motor 31 is also polygonal and is matched with the polygonal hole 304 of the eccentric shaft 30 to transmit the torque of the motor to the eccentric shaft 30. Preferably, the eccentric shaft 30 has at least two eccentric wheels 301 arranged axially along the eccentric shaft 30; wherein there is an eccentric 301 for driving the plunger 20 installed in the first installation hole 101; there is another eccentric 301 for driving the plunger 20 mounted in the second mounting hole 102. The plungers 2 of different layers are driven by different eccentrics 301, providing pumping efficiency.

Preferably, as shown in fig. 11-13, in the present embodiment, the number of the eccentric wheels 301 is two, but the number is not limited, and may be multiple; and the eccentric shaft 30 includes a shaft body; wherein, the line connecting the center 301 of one eccentric wheel and the center of the shaft body is defined as a first straight line 302, the line connecting the center 301 of the other eccentric wheel and the center of the shaft body is defined as a second straight line 303, the included angle between the first straight line 302 and the second straight line 303 is 180 degrees, and the included angle is set to be 180 degrees, so that the eccentric shaft 30 extrudes the plunger 20 on the same phase twice every time rotating one circle, and the time interval can be ensured to be equal.

The eccentric wheel 301 is sleeved with the needle bearing 32, the free end of the plunger 20 abuts against the outer surface of the needle bearing 32, on one hand, the needle bearing 32 can increase the compression amount of the plunger 20, on the other hand, the friction force can be reduced, the eccentric shaft 30 can smoothly rotate, and compared with other bearings, rollers of the needle bearing are in line contact with an inner ring and an outer ring, the contact area is larger, and the movement is more stable.

Preferably, as shown in fig. 7, each of the first and second mounting holes 101 and 102 includes a small hole section 1011 and a large hole section 1012 coaxially disposed with the small hole section 1011; the liquid outlet 103 penetrates through the large hole section 1012 of the second mounting hole 102 from the top of the mounting portion 10 to be communicated with the large hole section 1012 of the first mounting hole 101; the diameter of the liquid outlet 103 is smaller than that of the liquid inlet 105 to increase the pressure of the output hydraulic oil, and each mounting portion 10 is provided with at least two liquid outlets 103. The liquid outlet 103 communicates with the first mounting hole 101 and the second mounting hole 102 on the same phase, so that the plunger 20 on the same phase completes two pumping operations after the motor 31 rotates one circle.

Preferably, the plunger assembly 2 further comprises a sealing element 25, the plug 24 is provided with a sealing groove 240, and the sealing element 25 is disposed in the sealing groove 240; the overall dimension of the check valve plate 22 is smaller than the aperture of the large hole section 1012 and larger than the aperture of the small hole section 1011, so that the check valve plate 22 is ensured to control the one-way conduction of hydraulic oil, and the suck-back is further prevented; the overall dimension of the check valve plate 22 is much smaller than the aperture of the large hole section 1012, so that the processing difficulty of the check valve plate 22 is reduced, the flatness of the surface of the check valve plate contacting the small hole section 1011 can be correspondingly reduced, and the check valve plate can well seal hydraulic oil.

Preferably, the one-way valve plate 22 is provided with a groove 220 on the side close to the first elastic member 21, and a raised head 221 on the side close to the second elastic member 23; one end of the first elastic member 21 is disposed in the groove 220, and one end of the second elastic member 23 is disposed on the protrusion 221.

Preferably, the oil pump device further comprises a filter plate 40 having a plurality of filter holes 401, wherein the filter plate 40 is disposed between two adjacent mounting portions 10 at the position of the fillet 11 and is used for placing sundries to be sucked into the mounting cavity 100 of the pump body 1. The pump body 1 is provided with a plurality of pump body fixing holes 106 for fixing the filter plate 40 to the pump body by bolts 41. The motor 31 is arranged on the flange 42, and a plurality of connecting holes are formed in the flange 42. An oil seal 44 is mounted on the pump body 1 on the side close to the motor 31, and the oil seal 44 seals the oil in the mounting chamber 100 to prevent leakage.

In the working process, the motor 31 rotates to drive the eccentric shaft 30 to rotate, the eccentric wheel 301 on the eccentric shaft 30 rotates along with the eccentric shaft 30, the eccentric wheel 301 drives the needle bearing 32 sleeved on the eccentric wheel 301 to rotate, and the needle bearing 32 drives the plunger 20 to reciprocate in the first mounting hole 101 and/or the second mounting hole 102, so that hydraulic oil entering from the liquid inlet 105 and/or the liquid inlet tank 104 is pumped out from the liquid outlet 103 through the first mounting hole 101 or the second mounting hole 102, and high-pressure hydraulic oil is output. The oil pump device has the advantages of rapid oil inlet, small torque of the motor, output of large-flow and high-pressure oil, low energy consumption and high efficiency.

the specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.