CN114856992B

CN114856992B - Rotary plunger pump

Info

Publication number: CN114856992B
Application number: CN202210384673.6A
Authority: CN
Inventors: 周财华; 祝雪金; 何祖兵
Original assignee: DEPAMU (HANGZHOU) PUMP TECHNOLOGY CO LTD
Current assignee: DEPAMU (HANGZHOU) PUMP TECHNOLOGY CO LTD
Priority date: 2022-04-13
Filing date: 2022-04-13
Publication date: 2023-08-22
Anticipated expiration: 2042-04-13
Also published as: CN114856992A

Abstract

The invention relates to a rotary plunger pump, comprising: the device comprises a rotary plunger pump body, a driving connecting shaft, a rotary driving mechanism, an oil quantity supplementing cavity, a swash plate, an oil inlet, an oil outlet, a rotary hand wheel, a driving sliding block and a buffer sealing plug mechanism. The drive connecting shaft is rotatably arranged in the middle of the rotary plunger pump body. The rotary driving mechanism is arranged on the outer side of the rotary plunger pump body and is used for rotationally driving the driving connecting shaft. The oil mass replenishment chamber is provided inside the rotary plunger pump body. The sloping cam plate sets up on the inner wall of oil mass supply chamber. The oil inlet and the oil outlet are symmetrically arranged at the side edge of the oil quantity supplementing cavity. The oil inlet and the oil outlet are communicated with the oil quantity replenishing cavity. The invention has the advantage of greatly weakening the impact force generated in the reciprocating movement process of the plunger. The tightness between the edge of the plunger and the cylinder body is always enhanced. So that the flow rate in the cylinder body is more stable.

Description

Rotary plunger pump

Technical Field

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

Background

Plunger pumps are an important device of hydraulic systems. The plunger reciprocates in the cylinder body to change the volume of the sealed working cavity, so as to realize oil absorption and pressure oil. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency, convenient flow regulation and the like.

Plunger pumps are widely used in applications where high pressure, high flow and flow are to be regulated, such as hydraulic presses, engineering machinery and ships. The total reciprocating stroke L of the plunger pump plunger is unchanged and is determined by the lift of the cam. The amount of oil supplied per cycle of the plunger depends on the oil supply stroke, which is variable without control by the camshaft. The oil supply start timing does not change with the change in the oil supply stroke.

The plunger pump is in the actual use process. The plunger is driven by the driving device to reciprocate, and in the frequent reciprocation process, larger impact can be generated on the plunger. And the abrasion between the plunger edge and the cylinder body is easier to increase. So that a gap is generated between the edge of the plunger and the cylinder body, and the flow is unstable after long-time work.

Disclosure of Invention

The present invention is directed to a rotary plunger pump, which solves the above-mentioned problems.

In order to achieve the above purpose, the present invention provides the following technical solutions:

a rotary plunger pump, comprising: the device comprises a rotary plunger pump body, a driving connecting shaft, a rotary driving mechanism, an oil quantity supplementing cavity, a swash plate, an oil inlet, an oil outlet, a rotary hand wheel, a driving sliding block and a buffer sealing plug mechanism. The drive connecting shaft is rotatably arranged in the middle of the rotary plunger pump body. The rotary driving mechanism is arranged on the outer side of the rotary plunger pump body and is used for rotationally driving the driving connecting shaft. The oil mass replenishment chamber is provided inside the rotary plunger pump body. The sloping cam plate sets up on the inner wall of oil mass supply chamber. The oil inlet and the oil outlet are symmetrically arranged at the side edge of the oil quantity supplementing cavity. The oil inlet and the oil outlet are communicated with the oil quantity replenishing cavity. The rotary hand wheel is arranged on the rotary plunger pump body. The driving slide block is arranged at the end part of the driving shaft of the rotating hand wheel. The buffer sealing plug mechanism is arranged in the oil quantity supplying cavity. The buffer sealing plug mechanism is connected with a driving connecting shaft, and the driving connecting shaft is used for driving the buffer sealing plug mechanism in a reciprocating mode.

As a further scheme of the invention: the outer side of the rotating hand wheel is provided with anti-skid lines for increasing the rotating friction force.

As a further scheme of the invention: the buffer seal plug mechanism includes: a flow stabilizing seal assembly and an impact force dampening assembly. The flow stabilizing seal assembly includes: plunger push plate, side sliding seal plug, connection inserted bar, connection slot, inner chamber movable groove, inner chamber slide bar, sealed conflict spring, tip striking buffer block, tip sliding plate, tip slide groove, inner chamber connecting groove and drive articulated pole. The plunger pushing plate is arranged in the oil quantity supplementing cavity. The side sliding sealing plug is arranged on the side of the plunger pushing plate. The connecting inserted link is connected with the side sliding sealing plug vertically. The connecting slot is arranged at the side edge of the plunger pushing plate. The end part of the connecting inserting rod is inserted in the connecting slot in a sliding way. The inner cavity movable groove is arranged at the end part of the connecting inserted link. The inner cavity sliding rod is inserted into the inner cavity movable groove in a sliding way. The end part of the inner cavity sliding rod is connected with the inner wall of the connecting slot. The sealing abutting spring is arranged in the inner cavity movable groove. One end of the sealing abutting spring is connected with the inner wall of the inner cavity movable groove. The other end of the sealing abutting spring is connected with the end part of the inner cavity sliding rod. The end impact buffer block is arranged on the outer side of the plunger pushing plate. The end sliding plate is connected with the end impact buffer block. The end sliding groove is arranged on the plunger pushing plate. The end sliding plate is inserted in the end sliding groove in a sliding way. The inner cavity connecting groove is arranged in the plunger pushing plate. The inner cavity connecting groove is used for communicating the end sliding groove with the connecting slot. The drive articulated rod is hinged to the side edge of the end sliding plate. The driving hinging rod penetrates through the inner cavity connecting groove and is hinged with the side edge of the connecting inserting rod.

As a further scheme of the invention: the outside of tip striking buffer block is provided with the blotter that is used for strengthening the buffering effect.

As a further scheme of the invention: the outside of the side sliding sealing plug is provided with a sealing gasket for enhancing the sliding tightness.

As a further scheme of the invention: the inner cavity connecting groove is in an irregular shape which is matched with the deformation of the driving hinging rod.

As a further scheme of the invention: the impact force attenuation module includes: the device comprises a reciprocating connecting push rod, a buffering inner cavity, a sliding connecting block, a first buffer rod, a second buffer rod, an inner cavity hinging block, an impact force weakening spring, a side stabilizing groove and a side stabilizing rod. The reciprocating connection push rod is arranged at the side edge of the plunger pushing plate. The end part of the reciprocating connection push rod is connected with the end part of the driving connection shaft. The buffer inner cavity is arranged in the reciprocating connection push rod. The sliding connection block is arranged at the end part of the reciprocating connection push rod. The end part of the sliding connecting block is inserted into the buffer inner cavity in a sliding way. The first buffer rods are symmetrically hinged to the inner wall of the buffer inner cavity. The second buffer rod is symmetrically hinged to the side wall of the sliding connecting block. The first buffer rod is connected with the second buffer rod through hinge. The inner cavity hinge block is connected with the hinge rotation of the first buffer rod and the second buffer rod. The impact force weakening spring is used for elastically connecting the inner cavity hinging blocks. The side stabilizing grooves are symmetrically arranged at the end parts of the reciprocating connecting push rod. The side stabilizer bar is inserted in the side stabilizer groove in a sliding way. The end part of the side stabilizer bar penetrates out of the side stabilizer groove and is connected with the side of the plunger pushing plate.

As a further scheme of the invention: the sliding connecting block is T-shaped, and the buffer inner cavity is a T-shaped groove matched with the sliding connecting block.

As a further scheme of the invention: the tip of first buffer rod is provided with the connecting block, and the connecting block links to each other with buffering inner chamber inside articulated.

As a further scheme of the invention: the tip of second buffer rod is provided with the connecting block, and the connecting block links to each other with the lateral wall hinge of sliding connection piece.

Compared with the prior art, the invention has the beneficial effects that: the impact force generated in the reciprocating movement process of the plunger can be greatly weakened. The tightness between the edge of the plunger and the cylinder body is always enhanced. So that the flow rate in the cylinder body is more stable.

Through the buffer seal plug mechanism that sets up in the oil mass supply chamber inside. The flow stabilizing sealing assembly arranged inside the buffering sealing plug mechanism can be abutted under the elasticity of the sealing abutting spring. The side sliding sealing plug is pushed to be always attached to the inner wall of the oil quantity supplying cavity. And further the side portions of the side sliding sealing plugs are worn even in the long-time use process. Can also be attached to the inner wall of the oil quantity supplying cavity under the elastic interference of the sealing interference spring.

And an impact force attenuating assembly is provided. The sliding connection block is arranged inside the push rod through the reciprocating connection. The end part of the sliding connecting block is provided with a first buffer rod which is hinged with a second buffer rod. An impact force weakening spring is arranged at the hinged end of the first buffer rod and the second buffer rod. So that the impact force received by the plunger pushing plate is transmitted to the impact force attenuation spring. Is greatly weakened, so that the integral plunger reciprocating impact force is reduced.

Other features and advantages of the present invention will be disclosed in the following detailed description of the invention and the accompanying drawings.

Drawings

FIG. 1 is an overall schematic of a rotary plunger pump of the present invention;

fig. 2 is a schematic cross-sectional elevation view of the structure of the present invention.

Fig. 3 is a schematic cross-sectional view of the structure of the cushioning sealing plug mechanism of fig. 2 in accordance with the present invention.

Fig. 4 is an enlarged schematic view of the structure of the inner cavity connecting groove in fig. 3 according to the present invention.

FIG. 5 is a schematic cross-sectional view of the impact-attenuating assembly of FIG. 3 according to the invention.

List of reference numerals: a rotary plunger pump 100; rotating the plunger pump body 10; a drive connection shaft 11; a rotation driving mechanism 12; an oil amount replenishment chamber 13; a swash plate 14; an oil inlet 15; an oil outlet 16; rotating the hand wheel 17; a drive slider 18; a buffer seal plug mechanism 20; a flow stabilizing seal assembly 21; plunger pushing plate 210; side sliding sealing plugs 211; a connecting plunger 212; a connection slot 213; an inner cavity active slot 214; a lumen sliding rod 215; sealing against spring 216; an end impact buffer block 217; an end sliding plate 218; an end sliding groove 219; an inner cavity connecting groove 220; driving the hinge lever 221; an impact force attenuation module 23; the reciprocation connection push rod 230; a buffer lumen 231; a sliding connection block 232; first buffer rod 233; a second buffer rod 234; an inner cavity articulation block 235; impact force attenuating springs 236; side stabilizing slots 237; side stabilizer bar 238.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1 to 5, in an embodiment of the present invention, a rotary plunger pump 100 includes: the rotary plunger pump body 10, the drive connecting shaft 11, the rotary driving mechanism 12, the oil supplementing cavity 13, the swash plate 14, the oil inlet 15, the oil outlet 16, the rotary hand wheel 17, the driving sliding block 18 and the buffer sealing plug mechanism 20. The drive connection shaft 11 is rotatably provided in the middle of the rotary plunger pump body 10. The rotary drive mechanism 12 is provided outside the rotary plunger pump body 10, and the rotary drive mechanism 12 is configured to rotationally drive the drive connection shaft 11. The oil quantity replenishment chamber 13 is provided inside the rotary plunger pump body 10. The swash plate 14 is provided on the inner wall of the oil replenishment chamber 13. The oil inlet 15 and the oil outlet 16 are symmetrically arranged at the side edge of the oil quantity supplementing cavity 13. The oil inlet 15 and the oil outlet 16 are communicated with the oil supplementing cavity 13. A rotary hand wheel 17 is provided on the rotary plunger pump body 10. The drive slider 18 is arranged at the end of the drive shaft of the rotary handwheel 17. The buffer seal plug mechanism 20 is provided in the oil quantity replenishment chamber 13. The buffer seal mechanism 20 is connected to the drive connection shaft 11, and the drive connection shaft 11 is used for reciprocally driving the buffer seal mechanism 20.

The outer side of the rotary hand wheel 17 is provided with anti-slip threads for increasing the rotational friction.

In the embodiment of the invention, the plunger pump is in the actual use process. The plunger is driven by the driving device to reciprocate, and in the frequent reciprocation process, larger impact can be generated on the plunger. And the abrasion between the plunger edge and the cylinder body is easier to increase. So that a gap is generated between the edge of the plunger and the cylinder body, and the flow is unstable after long-time work.

In order to maintain a relatively stable flow rate for a long time in a reciprocating motion of the flow rate inside the plunger pump. By providing the buffer seal plug mechanism 20 within the rotary plunger pump body 10 on a rotary plunger pump 100. The buffer seal plug mechanism 20 can always contact the inner wall of the oil replenishment chamber 13 when the plunger reciprocates in the oil replenishment chamber 13. And the buffer seal plug mechanism 20 can also weaken the collision force of the plunger striking the inner wall of the oil replenishment chamber 13 through the driving of the driving connection shaft 11. The rotary driving mechanism 12 is prevented from driving the connecting shaft 11 to do frequent reciprocating motion in the rotary plunger pump body 10 to generate larger impact. Friction between the buffer seal plug mechanism 20 and the inner wall of the oil replenishment chamber 13 is further reduced. So that the buffer seal mechanism 20 can be used for a longer time with the oil replenishment chamber 13 kept intact. The oil flowing in and out of the oil feed amount replenishment chamber 13 is made to flow more stably. The flow is more stable.

As shown in fig. 1 to 5, in the embodiment of the present invention, the cushion sealing plug mechanism 20 includes: a flow stabilizing seal assembly 21 and an impact force attenuating assembly 23. The flow stabilizing seal assembly 21 includes: plunger pushing plate 210, side sliding sealing plug 211, connecting rod 212, connecting slot 213, cavity moving slot 214, cavity sliding rod 215, sealing interference spring 216, end impact buffer block 217, end sliding plate 218, end sliding slot 219, cavity connecting slot 220, and driving hinge rod 221. The plunger pushing plate 210 is provided in the oil replenishment chamber 13. A side sliding sealing plug 211 is provided at the side of the plunger pushing plate 210. The connecting rod 212 is vertically connected to the side sliding sealing plug 211. The connection slot 213 is formed at a side of the plunger pushing plate 210. The end of the connection rod 212 is slidably inserted into the connection slot 213. An inner cavity movable slot 214 is formed at the end of the connecting rod 212. The cavity sliding rod 215 is slidably inserted into the cavity moving groove 214. The end of the cavity sliding rod 215 is connected with the inner wall of the connecting slot 213. A seal against spring 216 is disposed within the cavity active slot 214. One end of the seal abutting spring 216 is connected with the inner wall of the inner cavity movable groove 214. The other end of the seal against spring 216 is connected to the end of the lumen sliding rod 215. The end impact damper 217 is disposed outside the plunger push plate 210. An end slide plate 218 is connected to the end impact damper block 217. An end sliding groove 219 is provided in the plunger pushing plate 210. The end slide plate 218 is slidably inserted into the end slide groove 219. An inner cavity connecting groove 220 is formed in the plunger pushing plate 210. The cavity connecting slot 220 communicates the end sliding slot 219 with the connecting slot 213. The driving hinge lever 221 is hinge-provided at a side of the end sliding plate 218. The driving hinge rod 221 is hinge-coupled to the side of the connection plunger 212 through the inner cavity connection slot 220.

The outside of the end impact buffer block 217 is provided with a buffer pad for enhancing the buffer effect.

The outside of the side sliding seal plug 211 is provided with a gasket for enhancing sliding sealability.

The inner cavity connecting groove 220 has an irregular shape in association with deformation of the driving hinge lever 221.

In the embodiment of the invention. When the driving connecting shaft 11 drives the impact force reducing component 23 to drive the flow stabilizing and sealing component 21 to reciprocate in the oil supplementing cavity 13. The side sliding seal plug 211 inside the flow stabilizing seal assembly 21 will contact the inner wall of the oil replenishment chamber 13. And during the contact, the side sliding sealing plug 211 is sometimes pressed. The side sliding seal plug 211 transmits the pressing force to the connection plug 212. The connecting plunger 212 is pressed by a cavity sliding rod 215 and a seal abutting spring 216 slidably provided in the cavity movable groove 214. So that the seal against spring 216 deforms upon compression. The deformed seal against spring 216 side has a portion of the force to counteract the transmitted compression force. The other half of the deformed force again presses against the connecting rod 212. So that the connecting rod 212 transmits the pressing force to the side sliding seal plug 211. The side sliding seal plug 211 is always attached to the inner wall of the oil replenishment chamber 13. And further, the situation that the oil inlet and outlet flow is unstable due to the fact that the oil leakage cannot occur in the moving process of the side sliding sealing plug 211 is ensured. And at the same time moves the side sliding sealing plug 211. The end impact buffer block 217 is driven to collide with the inner wall of the oil replenishment chamber 13. The end impact buffer block 217 transmits the impact force to the connecting rod 212 through the driving hinge rod 221, so as to drive the connecting rod 212 to push the side sliding sealing plug 211 to further fit with the inner wall of the oil supplementing cavity 13.

A cushion pad is provided on the end impact buffer block 217. The cushion pad can enhance the impact force of the end impact bumper 217 when impacted.

The gasket provided on the outer side of the side sliding seal plug 211 can effectively enhance the friction between the side portion of the side sliding seal plug 211 and the inner wall of the oil replenishment chamber 13.

As shown in fig. 1 to 5, in the embodiment of the present invention, the impact force reducing assembly 23 includes: the push rod 230, the buffer cavity 231, the sliding connection block 232, the first buffer rod 233, the second buffer rod 234, the cavity hinge block 235, the impact force attenuation spring 236, the side stabilizing groove 237, and the side stabilizing rod 238 are reciprocally connected. The reciprocation connection push rod 230 is provided at a side of the plunger push plate 210. The end of the reciprocation connection push rod 230 is connected to the end of the driving connection shaft 11. A buffer chamber 231 is provided inside the reciprocating plunger 230. The sliding connection block 232 is provided at an end of the reciprocating connection push rod 230. The end of the slide connection block 232 is slidably inserted into the buffer cavity 231. The first buffer rod 233 is symmetrically hinged to the inner wall of the buffer cavity 231. The second buffer rod 234 is symmetrically hinged on the side wall of the sliding connection block 232. First buffer rod 233 is connected to second buffer rod 234 by a hinge. The inner cavity articulation block 235 is pivotally connected to the first and second buffer rods 233, 234. Impact attenuating springs 236 are used to resiliently connect the cavity hinge blocks 235 to one another. The side stabilizing channels 237 are symmetrically formed at the ends of the reciprocating connecting rods 230. The side stabilizer bar 238 is slidably inserted into the side stabilizer groove 237. The ends of the side stabilizer bar 238 pass through the side stabilizer groove 237 and are connected to the sides of the plunger push plate 210.

The sliding connection block 232 is in a T shape, and the buffer inner cavity 231 is in a T-shaped groove matched with the sliding connection block 232.

The end of the first buffer rod 233 is provided with a connection block, which is connected to the inside of the buffer cavity 231 by hinge.

The end of the second buffer rod 234 is provided with a connection block that is hingedly connected to the side wall of the sliding connection block 232.

In an embodiment of the invention, the aim is to reduce the large impact force on the plunger during the reciprocating movement. By making an elastic connection between the plunger pushing plate 210 and the reciprocation connection push rod 230. When the plunger pushing plate 210 receives a large impact force. The impact force will be transferred to the sliding connection block 232 by the plunger pushing plate 210. So that the sliding connection block 232 moves toward the inside of the buffer cavity 231. The sliding connection block 232 transmits the impact force to the second buffer rod 234 and the first buffer rod 233. The angle between the second buffer rods 234 and 23 is changed to compress the impact attenuating spring 236 associated with the cavity hinge block 235. The impact attenuating spring 236 generates a certain spring back force internally after compression. And further counteracts the transmitted impact force. So that the impact force transmitted from the plunger pushing plate 210 to the reciprocation connection push rod 230 is greatly reduced.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. A rotary plunger pump, comprising: the device comprises a rotary plunger pump body, a driving connecting shaft, a rotary driving mechanism, an oil quantity supplementing cavity, a swash plate, an oil inlet, an oil outlet, a rotary hand wheel, a driving sliding block and a buffer sealing plug mechanism; the driving connecting shaft is rotatably arranged in the middle of the rotary plunger pump body; the rotary driving mechanism is arranged on the outer side of the rotary plunger pump body and is used for rotationally driving the driving connecting shaft; the oil quantity replenishing cavity is arranged in the rotary plunger pump body; the swash plate is arranged on the inner wall of the oil quantity replenishing cavity; the oil inlet and the oil outlet are symmetrically arranged at the side edge of the oil quantity supplementing cavity; the oil inlet and the oil outlet are communicated with the oil quantity supplementing cavity; the rotary hand wheel is arranged on the rotary plunger pump body; the driving sliding block is arranged at the end part of the driving shaft of the rotating hand wheel; the buffer sealing plug mechanism is arranged in the oil quantity supplying cavity; the buffer sealing plug mechanism is connected with the driving connecting shaft, and the driving connecting shaft is used for driving the buffer sealing plug mechanism in a reciprocating manner;

the buffer seal plug mechanism includes: a flow stabilizing seal assembly and an impact force mitigation assembly; the flow stabilizing seal assembly includes: the device comprises a plunger pushing plate, a side sliding sealing plug, a connecting inserting rod, a connecting slot, an inner cavity movable groove, an inner cavity sliding rod, a sealing abutting spring, an end impact buffer block, an end sliding plate, an end sliding groove, an inner cavity connecting groove and a driving hinging rod; the plunger pushing plate is arranged in the oil quantity supplementing cavity; the side sliding sealing plug is arranged on the side of the plunger pushing plate;

the connecting inserted link is vertically connected with the side sliding sealing plug; the connecting slot is formed on the side edge of the plunger pushing plate; the end part of the connecting inserting rod is inserted into the connecting slot in a sliding way; the inner cavity movable groove is formed at the end part of the connecting inserted link; the inner cavity sliding rod is inserted in the inner cavity movable groove in a sliding way; the end part of the inner cavity sliding rod is connected with the inner wall of the connecting slot; the sealing abutting spring is arranged in the inner cavity movable groove; one end of the sealing abutting spring is connected with the inner wall of the inner cavity movable groove; the other end of the sealing abutting spring is connected with the end part of the inner cavity sliding rod;

the end impact buffer block is arranged on the outer side of the plunger pushing plate; the end sliding plate is connected with the end impact buffer block; the end sliding groove is formed in the plunger pushing plate; the end sliding plate is inserted in the end sliding groove in a sliding manner; the inner cavity connecting groove is formed in the plunger pushing plate; the inner cavity connecting groove is used for communicating the end sliding groove with the connecting slot; the driving hinging rod is hinged to the side edge of the end sliding plate; the driving hinging rod penetrates through the inner cavity connecting groove to be hinged with the side edge of the connecting inserting rod.

2. A rotary plunger pump as set forth in claim 1, wherein,

and anti-skid grains for increasing the rotation friction force are arranged on the outer side of the rotation hand wheel.

3. A rotary plunger pump as set forth in claim 1, wherein,

the outside of tip striking buffer block is provided with the blotter that is used for strengthening the cushioning effect.

4. A rotary plunger pump as set forth in claim 3 wherein,

and a sealing gasket for enhancing sliding tightness is arranged on the outer side of the side sliding sealing plug.

5. A rotary plunger pump as set forth in claim 4, wherein,

the inner cavity connecting groove is in an irregular shape when the driving hinging rod deforms.

6. A rotary plunger pump as set forth in claim 5, wherein,

the impact force mitigation assembly includes: the device comprises a reciprocating connecting push rod, a buffering inner cavity, a sliding connecting block, a first buffer rod, a second buffer rod, an inner cavity hinging block, an impact force weakening spring, a side stabilizing groove and a side stabilizing rod; the reciprocating connection push rod is arranged at the side edge of the plunger pushing plate; the end part of the reciprocating connecting push rod is connected with the end part of the driving connecting shaft; the buffer inner cavity is arranged in the reciprocating connection push rod; the sliding connecting block is arranged at the end part of the reciprocating connecting push rod; the end part of the sliding connecting block is inserted into the buffer inner cavity in a sliding way; the first buffer rods are symmetrically hinged on the inner wall of the buffer inner cavity; the second buffer rods are symmetrically hinged on the side wall of the sliding connecting block; the first buffer rod is connected with the second buffer rod through a hinge; the inner cavity hinging block is hinged and rotatably connected with the first buffer rod and the second buffer rod; the impact force weakening spring is used for elastically connecting the inner cavity hinging blocks; the side stabilizing grooves are symmetrically formed at the end parts of the reciprocating connecting push rod; the side stabilizer bar is inserted in the side stabilizer groove in a sliding manner; the end part of the side stabilizer rod penetrates out of the side stabilizer groove and is connected with the side of the plunger pushing plate.

7. A rotary plunger pump as set forth in claim 6, wherein,

the sliding connecting block is T-shaped, and the buffer inner cavity is a T-shaped groove matched with the sliding connecting block.

8. A rotary plunger pump as set forth in claim 7, wherein,

the end part of the first buffer rod is provided with a connecting block, and the connecting block is hinged and connected with the inside of the buffer inner cavity.

9. A rotary plunger pump as set forth in claim 8, wherein,

the end of the second buffer rod is provided with a connecting block, and the connecting block is hinged with the side wall of the sliding connecting block.