阅读说明：本技术 一种柱塞泵 (Plunger pump ) 是由 王丽娜 程建军 刘欣 于 2021-09-18 设计创作，主要内容包括：本发明公开了一种柱塞泵,包括泵体,所述泵体内设有泵腔,所述泵腔内转动连接有转子,所述转子内设有安装槽,所述泵体的左端固定设有泵盖,所述泵盖内设有槽孔；所述安装槽的左端开口处固定设有导向盘,所述安装槽设有中间轴,所述中间轴的左端设有动力轴；所述槽孔固定设有斜盘,所述中间轴的左端套接有回程盘,所述回程盘内设有滑靴；所述安装槽内设有缸体块组件,所述导向盘设有柱塞,每个柱塞的左端均球铰接在对应的滑靴内；所述泵盖的外侧设有进油口和出油口,所述泵体内设有阀控组件；该柱塞泵不仅结构简单,而且能够实现空载启动,减小对回路的冲击。(The invention discloses a plunger pump, which comprises a pump body, wherein a pump cavity is arranged in the pump body, a rotor is rotationally connected in the pump cavity, an installation groove is formed in the rotor, a pump cover is fixedly arranged at the left end of the pump body, and a slotted hole is formed in the pump cover; a guide disc is fixedly arranged at an opening at the left end of the mounting groove, an intermediate shaft is arranged in the mounting groove, and a power shaft is arranged at the left end of the intermediate shaft; the slotted hole is fixedly provided with a swash plate, the left end of the intermediate shaft is sleeved with a return plate, and a sliding shoe is arranged in the return plate; a cylinder block assembly is arranged in the mounting groove, the guide disc is provided with plungers, and the left end of each plunger is hinged in the corresponding sliding shoe in a spherical manner; an oil inlet and an oil outlet are formed in the outer side of the pump cover, and a valve control assembly is arranged in the pump body; the plunger pump is simple in structure, can be started in a no-load mode, and reduces impact on a loop.)

1. A plunger pump is characterized by comprising a pump body, wherein a pump cavity with an opening at the left end is arranged in the pump body, a rotor is rotationally connected in the pump cavity, an installation groove with an opening at the left end is arranged in the rotor, a pump cover is fixedly arranged at the left end of the pump body, and a groove hole communicated with the pump cavity is arranged in the pump cover; a guide disc is fixedly arranged at an opening at the left end of the mounting groove, a middle shaft which extends leftwards and penetrates through the guide disc to extend into the groove hole is arranged at the center of the right end of the mounting groove, and a power shaft which extends out of the pump cover is arranged at the left end of the middle shaft in an extending manner leftwards; the left end of the slotted hole is fixedly provided with a swash plate sleeved outside the power shaft, the left end of the intermediate shaft is sleeved with a return disc parallel to the swash plate, and a plurality of sliding shoes connected with the swash plate in a sliding manner are arranged in the return disc at intervals along the circumferential direction of the return disc; a plurality of cylinder block assemblies which are in one-to-one correspondence with the sliding shoes are arranged in the mounting groove at intervals along the circumferential direction of the intermediate shaft, a plurality of plungers which are in one-to-one correspondence with the cylinder block assemblies are arranged in the guide disc at intervals along the circumferential direction, each plunger slides along the left-right direction, and the left end of each plunger is hinged in the corresponding sliding shoe in a spherical manner; the outside of pump cover is equipped with oil inlet and oil-out, the right-hand member of the inherent rotor of the pump body is equipped with the valve accuse subassembly of being connected with cylinder block subassembly, and when rotor speed was not more than the setting value, valve accuse subassembly control cylinder block subassembly separated and formed lubricated clearance between the plunger, and when rotor speed was greater than the setting value, valve accuse subassembly control cylinder block subassembly was closed and plunger sliding fit, and formed the hydraulic pressure cavity between the right-hand member of the inherent plunger of cylinder block subassembly and the right-hand member of mounting groove, the oil inlet passes through oil feed check valve and hydraulic pressure cavity intercommunication, the oil-out passes through oil outlet check valve and hydraulic pressure cavity intercommunication.

2. The plunger pump according to claim 1, wherein the cylinder block assembly comprises two cylinder sliders with sector-shaped cross sections, semicircular valve holes are formed in the opposite sides of the two cylinder sliders, the plungers are located in the two semicircular valve holes, and when the cylinder block assembly is closed, the two semicircular valve holes are spliced to form a circular valve hole for the plungers to extend into; a proximal spring and a distal spring are arranged between the two cylinder sliders and are used for forcing the two cylinder sliders to be separated.

3. The plunger pump according to claim 2, wherein the valve control assembly comprises a circular plate, a first sliding groove is formed in the right end center of the pump cavity in the pump body, the circular plate is slidably connected in the first sliding groove in the left-right direction, a plurality of inclined plane sliding blocks extending leftwards into the mounting groove and located between the two cylinder block assemblies are arranged on the left end surface of the circular plate in the circumferential direction, the inclined plane sliding blocks control the two cylinder blocks in the cylinder block assemblies to move towards each other to close when the inclined plane sliding blocks move leftwards, and the inclined plane sliding blocks control the two cylinder blocks in the cylinder block assemblies to move away from each other when the inclined plane sliding blocks move rightwards; a second sliding groove coaxial with the first sliding groove is formed in the right end of the first sliding groove in the pump body; the right end of the circular plate is provided with an annular convex plate which extends rightwards and extends into the second sliding groove; a convex shaft penetrating through the circular plate and extending into the annular convex plate is arranged at the center of the right end of the rotor, and a rotating block fixedly connected with the right end of the convex shaft is rotationally connected in the annular convex plate; the rotating block is internally provided with a centrifugal driving assembly and a centrifugal positioning assembly, when the rotating speed of the rotating block is not more than a set value, the circular plate is positioned at the right end position of the first sliding groove, when the rotating speed of the rotating block is more than the set value, the centrifugal driving assembly controls the annular convex plate to drive the circular plate to move leftwards along the first sliding groove, and when the circular plate moves to the left end position, the centrifugal positioning assembly positions the annular convex plate; when the rotating speed of the rotating block is reduced to be not more than a set value, the centrifugal positioning assembly controls the annular convex plate to unlock.

4. The plunger pump according to claim 3, wherein the centrifugal driving assembly comprises two first sliding blocks, the right end of the rotating block is symmetrically provided with two first radial grooves, the two first sliding blocks are respectively connected in the two first radial grooves in a sliding manner, the distal end of each first radial groove is provided with a first spring for forcing the first sliding block to move towards the direction close to the axis of the rotating block, and the right end of the rotating block is fixedly provided with a stop cover; a vertical sliding groove is formed in the right end face of the second sliding groove in the pump body, arc-shaped supporting plates are symmetrically and slidably connected in the vertical sliding groove, and second springs for forcing the two arc-shaped supporting plates to move in opposite directions are respectively arranged at the upper end and the lower end of the vertical sliding groove; a first thread section is arranged on the outer side of the circumference of the arc-shaped supporting plate in a radially extending mode, a second thread section is arranged on the inner side wall of the right end of the annular convex plate and is used for being in threaded connection with the first thread section; a first notch is formed in each first radial groove in the blocking cover, a first shaft lever extending out of the first notch is arranged on each first sliding block, the right ends of the two first shaft levers extend into push blocks in the two arc-shaped supporting plates, and an arc-shaped push plate is arranged on each push block; when the rotating speed of the rotating block is not more than a set value, the first sliding blocks are positioned at the position close to the center of the first radial groove under the action of the first spring, when the rotating speed of the rotating block is more than the set value, the two first sliding blocks drive the push block to move in the back direction through the first shaft lever, the push block pushes the arc supporting plate to move in the back direction through the arc push plate, the first thread section is in threaded connection with the second thread section, and the annular convex plate drives the circular plate to move leftwards; when the rotating speed of the rotating block is reduced to be not more than a set value, the two first sliding blocks move oppositely under the action of the first spring, and the two arc supporting plates move oppositely under the action of the second spring.

5. The plunger pump according to claim 3, wherein the centrifugal positioning assembly comprises two second sliding blocks, two second radial grooves are symmetrically formed at the right end of the rotating block, and the two second sliding blocks are respectively connected in the two second radial grooves in a sliding manner; the far end of each second radial groove in the rotating block is connected with a positioning rod in a sliding mode along the radial direction, a third spring used for forcing the positioning rod to retract into the rotating block is arranged in each second radial groove, and a positioning ring groove for the positioning rod to extend into is formed in the inner side wall of the annular convex plate; when the rotating speed of the rotating block is not more than the set value, the two positioning rods are retracted into the rotating block under the action of the third spring, and when the rotating speed of the rotating block is more than the set value and the circular plate moves to the left end position, the two second sliding blocks push the positioning rods to extend into the positioning ring grooves.

6. The plunger pump of claim 1, wherein the inner side wall of the slot is provided with a convex stop for stopping on the left side of the guide disc in the radial direction near the right end opening.

7. The plunger pump according to claim 1, wherein the oil inlet is communicated with the slot, a first oil hole communicated with the slot and the hydraulic chamber is formed in the plunger, and the oil inlet check valve is installed in the first oil hole and used for controlling oil in the slot to flow into the hydraulic chamber in a one-way mode; the pump cover is characterized in that a first annular groove communicated with an oil outlet is formed in the outer side of a power shaft in the pump cover, a second oil hole used for communicating a hydraulic cavity and the first annular groove is formed in the power shaft, an intermediate shaft and a rotor, and an oil outlet check valve is fixedly installed in the second oil hole and used for controlling oil in the hydraulic cavity to flow into the first annular groove in a one-way mode.

Technical Field

The invention relates to the technical field of hydraulic elements, in particular to a plunger pump.

Background

The plunger pump is an important device of a hydraulic system, and realizes the functions of oil absorption, oil pressing and the like by changing the volume of a sealed working cavity by means of reciprocating motion of a plunger in a cylinder body. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency, convenient flow regulation and the like, and is widely applied to occasions with high pressure, large flow and flow regulation requirements, such as petroleum machinery, hydraulic machines, engineering machinery and ships.

The following problems generally occur when the existing plunger pump is used:

1. in the prior art, because a piston of the plunger pump is matched with a rotor, a plunger cavity is compressed when the plunger pump is started to work, so that the plunger pump is loaded when being started and is started at high pressure, and the starting mode can cause great impact on the plunger pump and a hydraulic circuit;

2. when the plunger pump starts, because there is not even oil reservoir between plunger and the rotor for can produce great friction between plunger and the rotor, can shorten the life of plunger pump.

Disclosure of Invention

The invention aims to provide a plunger pump which is simple in structure, can realize no-load starting and reduces impact on a loop.

In order to achieve the purpose, the invention provides the following technical scheme: a plunger pump comprises a pump body, wherein a pump cavity with an opening at the left end is arranged in the pump body, a rotor is rotationally connected in the pump cavity, and a mounting groove with an opening at the left end is arranged in the rotor; a pump cover is fixedly arranged at the left end of the pump body, and a slot hole communicated with the pump cavity is formed in the pump cover; a guide disc is fixedly arranged at an opening at the left end of the mounting groove, a middle shaft which extends leftwards and penetrates through the guide disc to extend into the groove hole is arranged at the center of the right end of the mounting groove, and a power shaft which extends out of the pump cover is arranged at the left end of the middle shaft in an extending manner leftwards; the left end of the slotted hole is fixedly provided with a swash plate sleeved outside the power shaft, the left end of the intermediate shaft is sleeved with a return disc parallel to the swash plate, and a plurality of sliding shoes connected with the swash plate in a sliding manner are arranged in the return disc at intervals along the circumferential direction of the return disc; a plurality of cylinder block assemblies which are in one-to-one correspondence with the sliding shoes are arranged in the mounting groove at intervals along the circumferential direction of the intermediate shaft, a plurality of plungers which are in one-to-one correspondence with the cylinder block assemblies are arranged in the guide disc at intervals along the circumferential direction, each plunger slides along the left-right direction, and the left end of each plunger is hinged in the corresponding sliding shoe in a spherical manner; the outside of pump cover is equipped with oil inlet and oil-out, the right-hand member of the inherent rotor of the pump body is equipped with the valve accuse subassembly of being connected with cylinder block subassembly, and when rotor speed was not more than the setting value, valve accuse subassembly control cylinder block subassembly separated and formed lubricated clearance between the plunger, and when rotor speed was greater than the setting value, valve accuse subassembly control cylinder block subassembly was closed and plunger sliding fit, and formed the hydraulic pressure cavity between the right-hand member of the inherent plunger of cylinder block subassembly and the right-hand member of mounting groove, the oil inlet passes through oil feed check valve and hydraulic pressure cavity intercommunication, the oil-out passes through oil outlet check valve and hydraulic pressure cavity intercommunication.

Furthermore, the cylinder block assembly comprises two cylinder sliders with sector-shaped sections, semicircular valve holes are formed in the side faces, opposite to the two cylinder sliders, of the two cylinder sliders, the plungers are located in the two semicircular valve holes, and when the cylinder block assembly is closed, the two semicircular valve holes are spliced to form a circular valve hole for the plungers to extend into; a proximal spring and a distal spring are arranged between the two cylinder sliders and are used for forcing the two cylinder sliders to be separated.

Furthermore, the valve control assembly comprises a circular plate, a first sliding groove is formed in the center of the right end of the pump cavity in the pump body, the circular plate is connected in the first sliding groove in a sliding mode along the left-right direction, a plurality of inclined plane sliding blocks which extend into the mounting groove leftwards and are located between the two cylinder block assemblies are arranged on the left end face of the circular plate along the circumferential direction, the inclined plane sliding blocks control the two cylinder blocks in the cylinder block assemblies to move towards each other to be closed when the inclined plane sliding blocks move leftwards, and the inclined plane sliding blocks control the two cylinder blocks in the cylinder block assemblies to move away from each other when the inclined plane sliding blocks move rightwards; a second sliding groove coaxial with the first sliding groove is formed in the right end of the first sliding groove in the pump body; the right end of the circular plate is provided with an annular convex plate which extends rightwards and extends into the second sliding groove; a convex shaft penetrating through the circular plate and extending into the annular convex plate is arranged at the center of the right end of the rotor, and a rotating block fixedly connected with the right end of the convex shaft is rotationally connected in the annular convex plate; the rotating block is internally provided with a centrifugal driving assembly and a centrifugal positioning assembly, when the rotating speed of the rotating block is not more than a set value, the circular plate is positioned at the right end position of the first sliding groove, when the rotating speed of the rotating block is more than the set value, the centrifugal driving assembly controls the annular convex plate to drive the circular plate to move leftwards along the first sliding groove, and when the circular plate moves to the left end position, the centrifugal positioning assembly positions the annular convex plate; when the rotating speed of the rotating block is reduced to be not more than a set value, the centrifugal positioning assembly controls the annular convex plate to unlock.

Furthermore, the centrifugal driving assembly comprises two first sliding blocks, two first radial grooves are symmetrically formed in the right end of the rotating block, the two first sliding blocks are respectively connected in the two first radial grooves in a sliding mode, a first spring for forcing the first sliding blocks to move towards the direction close to the axis of the rotating block is arranged at the far end of each first radial groove, and a blocking cover is fixedly arranged at the right end of the rotating block; a vertical sliding groove is formed in the right end face of the second sliding groove in the pump body, arc-shaped supporting plates are symmetrically and slidably connected in the vertical sliding groove, and second springs for forcing the two arc-shaped supporting plates to move in opposite directions are respectively arranged at the upper end and the lower end of the vertical sliding groove; a first thread section is arranged on the outer side of the circumference of the arc-shaped supporting plate in a radially extending mode, a second thread section is arranged on the inner side wall of the right end of the annular convex plate and is used for being in threaded connection with the first thread section; a first notch is formed in each first radial groove in the blocking cover, a first shaft lever extending out of the first notch is arranged on each first sliding block, the right ends of the two first shaft levers extend into push blocks in the two arc-shaped supporting plates, and an arc-shaped push plate is arranged on each push block; when the rotating speed of the rotating block is not more than a set value, the first sliding blocks are positioned at the position close to the center of the first radial groove under the action of the first spring, when the rotating speed of the rotating block is more than the set value, the two first sliding blocks drive the push block to move in the back direction through the first shaft lever, the push block pushes the arc supporting plate to move in the back direction through the arc push plate, the first thread section is in threaded connection with the second thread section, and the annular convex plate drives the circular plate to move leftwards; when the rotating speed of the rotating block is reduced to be not more than a set value, the two first sliding blocks move oppositely under the action of the first spring, and the two arc supporting plates move oppositely under the action of the second spring.

Furthermore, the centrifugal positioning assembly comprises two second sliding blocks, two second radial grooves are symmetrically formed in the right end of the rotating block, and the two second sliding blocks are respectively connected in the two second radial grooves in a sliding mode; the far end of each second radial groove in the rotating block is connected with a positioning rod in a sliding mode along the radial direction, a third spring used for forcing the positioning rod to retract into the rotating block is arranged in each second radial groove, and a positioning ring groove for the positioning rod to extend into is formed in the inner side wall of the annular convex plate; when the rotating speed of the rotating block is not more than the set value, the two positioning rods are retracted into the rotating block under the action of the third spring, and when the rotating speed of the rotating block is more than the set value and the circular plate moves to the left end position, the two second sliding blocks push the positioning rods to extend into the positioning ring grooves.

Furthermore, a convex block which is blocked at the left side of the guide disc is radially arranged on the inner side wall of the slotted hole close to the opening at the right end.

Furthermore, the oil inlet is communicated with the slotted hole, a first oil hole communicated with the slotted hole and the hydraulic cavity is formed in the plunger, and the oil inlet check valve is installed in the first oil hole and used for controlling oil in the slotted hole to flow into the hydraulic cavity in a one-way mode; the pump cover is characterized in that a first annular groove communicated with an oil outlet is formed in the outer side of a power shaft in the pump cover, a second oil hole used for communicating a hydraulic cavity and the first annular groove is formed in the power shaft, an intermediate shaft and a rotor, and an oil outlet check valve is fixedly installed in the second oil hole and used for controlling oil in the hydraulic cavity to flow into the first annular groove in a one-way mode.

Advantageous effects

Compared with the prior art, the technical scheme of the invention has the following advantages:

1. by using the matching of the cylinder block assembly and the plunger, when the plunger pump is just started, the cylinder block assembly and the plunger do not form a hydraulic chamber, so that the plunger is not loaded in the early starting process, and the plunger pump is started in an idle state, thereby reducing the impact on a loop;

2. by using the matching of the cylinder block assembly and the plunger, when the plunger pump is just started, the cylinder block assembly and the plunger do not form a hydraulic chamber, and a larger lubricating gap exists between the cylinder block assembly and the piston, so that the plunger can uniformly coat oil in a semicircular valve hole of a cylinder slider in the reciprocating motion process to form an oil film, and when two subsequent cylinder sliders are close to the plunger, the friction is reduced, and the service life is prolonged;

3. through the matching of the cylinder block assembly and the circular plate with the inclined slide block, the inclined slide block can be extruded to move when entering and exiting the cylinder block, and is matched with the plunger to form a hydraulic chamber, so that the normal operation is realized, and the working process of firstly no-load and then load is realized;

4. through using the rotating block and the built-in first slider and second slider, when the plunger pump starts, the centrifugal force is used for driving the arc-shaped supporting plate to be unfolded, so that the first thread section and the second thread section in the annular convex plate are matched, and then the inclined plane slider is pushed to enter between two adjacent cylinder body sliders, thereby controlling the closing of the cylinder body block components, and the control form is simple without external control.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a sectional view taken along line A-A of FIG. 1 in accordance with the present invention;

FIG. 3 is a sectional view taken along line B-B of FIG. 1 in accordance with the present invention;

FIG. 4 is a cross-sectional view taken along line C-C of FIG. 1 in accordance with the present invention;

FIG. 5 is a cross-sectional view taken along line D-D of FIG. 1 in accordance with the present invention;

FIG. 6 is a cross-sectional view taken along line E-E of FIG. 1 in accordance with the present invention;

FIG. 7 is a cross-sectional view of the plunger pump of the present invention just after it is activated with the support block in threaded engagement with the control disk;

FIG. 8 is a sectional view taken along line A-A of FIG. 7 in accordance with the present invention;

FIG. 9 is a cross-sectional view taken along line B-B of FIG. 7 in accordance with the present invention;

FIG. 10 is a cross-sectional view taken along line C-C of FIG. 7 in accordance with the present invention;

FIG. 11 is a cross-sectional view of the plunger pump of the present invention in an on-load operation;

FIG. 12 is a cross-sectional view taken along line D-D of FIG. 11 in accordance with the present invention;

FIGS. 13-14 are external views of the circular plate, the inclined slider and the annular convex plate of the present invention.

Detailed Description

Referring to fig. 1 to 14, a plunger pump includes a pump body 1, a pump cavity 101 with an opening at the left end is arranged in the pump body 1, a rotor 3 is rotatably connected in the pump cavity 101, and an installation groove 301 with an opening at the left end is arranged in the rotor 3; a pump cover 2 is fixedly arranged at the left end of the pump body 1, and a slotted hole 2a communicated with the pump cavity 101 is formed in the pump cover 2; a guide disc 24 is fixedly arranged at the opening at the left end of the mounting groove 301, and a convex block 2a1 which blocks the left side of the guide disc 24 is radially arranged on the inner side wall of the slotted hole 2a close to the opening at the right end; a middle shaft 302 which extends leftwards and penetrates through the guide disc 24 to extend into the slotted hole 2a is arranged at the center of the right end of the mounting groove 301, and a power shaft 3a which extends out of the pump cover 2 is arranged at the left end of the middle shaft 302 in an extending way; the left end of the slotted hole 2a is fixedly provided with a swash plate 7 sleeved on the outer side of the power shaft 3a, the left end of the intermediate shaft 302 is sleeved with a return plate 5 parallel to the swash plate 7, and a plurality of sliding shoes 6 connected with the swash plate 7 in a sliding manner are arranged in the return plate 5 at intervals along the circumferential direction; a plurality of cylinder block assemblies which are in one-to-one correspondence with the sliding shoes 6 are arranged in the mounting groove 301 at intervals along the circumferential direction of the intermediate shaft 302, a plurality of plungers 4 which are in one-to-one correspondence with the cylinder block assemblies are arranged in the guide disc 24 at intervals along the circumferential direction, each plunger 4 slides along the left-right direction, and the left end of each plunger 4 is hinged in the corresponding sliding shoe 6; the outer side of pump cover 2 is equipped with oil inlet 202 and oil-out 203, the right-hand member of rotor 3 in the pump body 1 is equipped with the valve accuse subassembly of being connected with cylinder block subassembly, when rotor 3 rotational speed is not more than the setting value, valve accuse subassembly control cylinder block subassembly separates and forms the lubrication clearance between plunger 4, when rotor 3 rotational speed is greater than the setting value, valve accuse subassembly control cylinder block subassembly is closed and plunger 4 sliding fit, and forms hydraulic chamber 309 between the right-hand member of the interior plunger 4 of cylinder block subassembly and the right-hand member of mounting groove 301, oil inlet 202 communicates with hydraulic chamber 309 through oil feed check valve 9, oil-out 203 communicates with hydraulic chamber 309 through oil outlet check valve 10.

The cylinder block assembly comprises two cylinder sliders 8 with sector-shaped sections, semicircular valve holes 81 are formed in the side faces, opposite to the two cylinder sliders 8, of the two cylinder sliders, the plunger 4 is located in the two semicircular valve holes 81, and when the cylinder block assembly is closed, the two semicircular valve holes 81 are spliced to form a circular valve hole for the plunger 4 to extend into; a proximal spring 23 and a distal spring 22 are arranged between the two cylinder blocks 8, and the proximal spring 23 and the distal spring 22 are used for forcing the two cylinder blocks 8 to be separated.

The valve control assembly comprises a circular plate 11, a first sliding groove 102 is formed in the center of the right end of a pump cavity 101 in the pump body 1, the circular plate 11 is connected in the first sliding groove 102 in a sliding mode along the left-right direction, a plurality of inclined plane sliding blocks 11c which extend into the mounting groove 301 leftwards and are located between the two cylinder block assemblies are arranged on the left end face of the circular plate 11 along the circumferential direction, when the inclined plane sliding blocks 11c move leftwards, the inclined plane sliding blocks 11c control the two cylinder sliding blocks 8 in the cylinder block assemblies to move towards each other and close, and when the inclined plane sliding blocks 11c move rightwards, the inclined plane sliding blocks 11c control the two cylinder sliding blocks 8 in the cylinder block assemblies to move away from each other; a second sliding groove 103 coaxial with the first sliding groove 102 is arranged at the right end of the first sliding groove 102 in the pump body 1; the right end of the circular plate 11 is provided with an annular convex plate 111 which extends rightwards and extends into the second sliding groove 103; a convex shaft 308 which penetrates through the circular plate 11 and extends into the annular convex plate 111 is arranged at the center of the right end of the rotor 3, and a rotating block 12 fixedly connected with the right end of the convex shaft 308 is rotatably connected in the annular convex plate 111; a centrifugal driving assembly and a centrifugal positioning assembly are arranged in the rotating block 12, when the rotating speed of the rotating block 12 is not more than a set value, the circular plate 11 is positioned at the right end position of the first sliding groove 102, when the rotating speed of the rotating block 12 is more than the set value, the centrifugal driving assembly controls the annular convex plate 111 to drive the circular plate 11 to move leftwards along the first sliding groove 102, and when the circular plate 11 moves to the left end position, the centrifugal positioning assembly positions the annular convex plate 111; when the rotating speed of the rotating block 12 is reduced to be not more than the set value, the centrifugal positioning assembly controls the annular convex plate 111 to unlock.

The centrifugal driving assembly comprises two first sliding blocks 14, two first radial grooves 121 are symmetrically arranged at the right end of the rotating block 12, the two first sliding blocks 14 are respectively connected in the two first radial grooves 121 in a sliding manner, a first spring 21 for forcing the first sliding blocks 14 to move towards the direction close to the axis of the rotating block 12 is arranged at the far end of each first radial groove 121, and a blocking cover 20 is fixedly arranged at the right end of the rotating block 12; a vertical sliding chute 1a is arranged on the right end face of a second sliding chute 103 in the pump body 1, arc-shaped supporting plates 17 are symmetrically and slidably connected in the vertical sliding chute 1a, and second springs 18 for forcing the two arc-shaped supporting plates 17 to move oppositely are respectively arranged at the upper end and the lower end of the vertical sliding chute 1 a; a first thread section 17a is arranged on the outer side of the circumference of the arc-shaped supporting plate 17 in a radially extending mode, a second thread section 11b is arranged on the inner side wall of the right end of the annular convex plate 111, and the second thread section 11b is used for being in threaded connection with the first thread section 17 a; a first notch 20a is formed in each first radial groove 121 in the blocking cover 20, a first shaft lever 14a extending out of the first notch 20a is arranged on each first sliding block 14, the right ends of the two first shaft levers 14a extend into push blocks 141 in the two arc-shaped supporting plates 17, and an arc-shaped push plate 19 is arranged on each push block 141; when the rotating speed of the rotating block 12 is not greater than a set value, the first sliding blocks 14 are located at the positions close to the centers of the first radial grooves 121 under the action of the first springs 21, when the rotating speed of the rotating block 12 is greater than the set value, the two first sliding blocks 14 drive the push blocks 141 to move in the back direction through the first shaft levers 14a, the push blocks 141 push the arc-shaped supporting plates 17 to move in the back direction through the arc-shaped push plates 19, the first thread sections 17a are in threaded connection with the second thread sections 11b, and the circular convex plate 111 drives the circular plate 11 to move to the left; when the rotating speed of the rotating block 12 is reduced to be not more than the set value, the two first sliding blocks 14 move towards each other under the action of the first springs 21, and the two arc-shaped supporting plates 17 move towards each other under the action of the second springs 18.

The centrifugal positioning assembly comprises two second sliding blocks 13, two second radial grooves 122 are symmetrically formed in the right end of the rotating block 12, and the two second sliding blocks 13 are respectively connected in the two second radial grooves 122 in a sliding mode; a positioning rod 15 is connected to the distal end of each second radial groove 122 in the rotating block 12 in a sliding manner along the radial direction, a third spring 16 for forcing the positioning rod 15 to retract into the rotating block 12 is arranged in each second radial groove 122, and a positioning ring groove 11a for the positioning rod 15 to extend into is arranged on the inner side wall of the annular convex plate 111; when the rotating speed of the rotating block 12 is not greater than the set value, the two positioning rods 15 are both retracted into the rotating block 12 under the action of the third spring 16, and when the rotating speed of the rotating block 12 is greater than the set value and the circular plate 11 moves to the left end position, the two second sliding blocks 13 push the positioning rods 15 to extend into the positioning ring grooves 11 a.

The oil inlet 202 is communicated with the slotted hole 2a, a first oil hole 4a communicated with the slotted hole 2a and the hydraulic chamber 309 is arranged in the plunger 4, and the oil inlet check valve 9 is installed in the first oil hole 4a and is used for controlling the oil in the slotted hole 2a to flow into the hydraulic chamber 309 in a single direction; the pump cover 2 is internally provided with a first annular groove 2b communicated with the oil outlet 203 at the outer side of the power shaft 3a, the intermediate shaft 302 and the rotor 3 are internally provided with a second oil hole 3c used for communicating the hydraulic chamber 309 with the first annular groove 2b, and the oil outlet check valve 10 is fixedly arranged in the second oil hole 3c and used for controlling oil in the hydraulic chamber 309 to flow into the first annular groove 2b in a one-way manner.

As shown in fig. 1, as the internal structure of the present invention, when the pump is operated by using the plunger 4, it is required that the motor rotates the rotor 3 through the power shaft 3a, because the guide disc 24 is fixedly connected with the rotor 3, the guide disc 24 is in sliding fit with the plunger 4, when the rotor 3 rotates, the plunger 4 reciprocates in the left-right direction in the horizontal direction under the action of the slipper 6, the swash plate 7 and the return disc 5, at the moment, under the action of the proximal spring 23 and the distal spring 22 and the action of the inclined slide block 11c, the two cylinder slides 8 in the cylinder block assembly are separated and do not abut against the plunger 4, a lubricating gap is reserved between the two cylinder slides 8 (as shown in figure 5), so that the hydraulic oil in the plunger 4 pump can be uniformly coated on the semicircular valve hole 81 of the cylinder body slide block 8 when the plunger 4 reciprocates, an oil film is formed, and the plunger 4 pump is started in no-load mode.

Because the rotor 3 is fixedly connected with the rotating block 12, the rotating block 12 also rotates, the first sliding block 14 and the second sliding block 13 are under the action of centrifugal force, and when the rotating speed of the rotating block 12 is greater than a set value; firstly, the first slider 14 moves back against the first spring 21 under the action of centrifugal force (as shown in fig. 8 and 9), because the first slider 14 and the push block 141 are fixedly connected through the first shaft rod 14a, the first shaft rod 14a slides in the first notch 20a, so that the push block 141 drives the arc push plate 19 to push the arc support plate 17 outwards to push the arc support plate 17 to slide along the vertical chute 1a against the second spring 18, so that the first thread section 17a on the arc support plate 17 is meshed with the second thread section 11b in the annular convex plate 111 (as shown in fig. 7 and 10), because the arc support plate 17 is in sliding fit with the pump body 1 through the vertical chute 1a, the circular plate 11 is in sliding fit with the rotor 3 along the left-right direction and rotates along with the same, so that the circular plate 11 and the arc support plate 17 rotate relatively, under the action of inserting the first thread section 17a and the second thread section 11b, the circular plate 11 is pushed leftwards to drive the inclined slider 11c in the rotor 3, under the action of the inclined plane slide block 11c, the cylinder body slide blocks 8 on two sides are pushed to overcome the closing of the proximal spring 23 and the distal spring 22 to form a hydraulic chamber 309 (as shown in fig. 11 and 12) with the plunger 4, at the moment, the first thread section 17a and the second thread section 11b are just separated, the positioning ring groove 11a just comes to the position of the positioning rod 15, as the second slide block 13 is under the action of centrifugal force, the second slide block 13 overcomes the third spring 16 to push the positioning rod 15 to enter the positioning ring groove 11a, the annular convex plate 111 is positioned to prevent the annular convex plate 111 from returning under the action of hydraulic oil pressure, and the plunger 4 pump is changed into a load mode; when the plunger 4 moves leftwards, the hydraulic chamber 309 expands, and oil enters the hydraulic chamber 309 from the oil inlet 202 through the slotted hole 2a, the first oil hole 4a and the oil inlet check valve 9; when the plunger 4 moves to the right, the hydraulic chamber 309 is compressed, and the oil therein flows out from the oil outlet 203 through the second oil hole 3c, the oil outlet check valve 10 and the first ring groove 2b, thereby completing the load operation of the plunger 4 pump.

When the plunger 4 pump stops working, the power shaft 3a stops rotating, the rotor 3 stops rotating, the second sliding block 13 and the first sliding block 14 lose the action of centrifugal force, the positioning rod 15 is pushed to retreat from the positioning ring groove 11a under the action of the third spring 16, the positioning of the circular plate 11 is released, meanwhile, the first sliding block 14 is pushed to drive the push block 141 to move and draw together in opposite directions under the action of the first spring 21, the arc-shaped supporting plate 17 is pushed to slide towards the middle along the vertical sliding groove 1a under the action of the second spring 18, and the first thread section 17a and the second thread section 11b cannot be meshed together; under the action of the proximal spring 23 and the distal spring 22, the opposite cylinder block 8 is pushed away to be separated from the plunger 4, and under the action of the inclined plane slide block 11c, the circular plate 11 is pushed to move rightwards through the inclined plane 11c1 on the inclined plane slide block 11c, and returns to the position shown in fig. 1, 2, 3, 4, 5 and 6, so that the initial state is recovered.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.