CN213711253U - Plunger pump - Google Patents
Plunger pump Download PDFInfo
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- CN213711253U CN213711253U CN202022794524.6U CN202022794524U CN213711253U CN 213711253 U CN213711253 U CN 213711253U CN 202022794524 U CN202022794524 U CN 202022794524U CN 213711253 U CN213711253 U CN 213711253U
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- tappet
- suction
- plunger
- valve
- valve assembly
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Abstract
The utility model discloses a plunger pump, which comprises a split type frame and a hydraulic cylinder piece arranged on one side of the split type frame, wherein a plurality of groups of mutually independent power systems are arranged in the split type frame; the power system includes crank link mechanism, crank link mechanism is connected with plunger combined mechanism through the tappet, plunger combined mechanism's end sets up a set of suction valve subassembly with plunger combined mechanism matched with, suction valve subassembly is installed in hydraulic cylinder spare cavity, and is located the terminal upper and lower both sides of plunger combined mechanism, respectively with the suction pipeline and the discharge pipeline of hydraulic cylinder spare communicate mutually, through installing sealed dustproof machine oil emulsification device of preventing that prevents in the slideway port department of split type frame, can be when the tappet is making straight reciprocating motion for in the environment impurity such as dust, sand grain can't follow tappet motion gets into the frame, guarantee the reliability of lubricating oil, increased device life.
Description
Technical Field
The utility model relates to an oil field oil recovery water injection equipment field especially relates to a plunger pump.
Background
At present, with the continuous development and expansion of various large oil fields, the secondary oil extraction and water injection process is widely applied. Along with the development of oil fields, water injection amount and water injection pressure are continuously improved, the conventional pump can not meet the requirements of the oil field water injection process due to the reasons of performance, cost and the like, a novel plunger pump is urgently needed in the oil field market, the requirements of the water injection amount and the water injection pressure can be met, meanwhile, the requirements of energy conservation and consumption reduction are met, and the later-stage operation cost of a user and the operability of maintenance are comprehensively considered.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned defect or not enough, the utility model aims to provide a plunger pump.
In order to achieve the above purpose, the technical scheme of the utility model is that:
a plunger pump comprises a split type rack and a hydraulic cylinder piece arranged on one side of the split type rack, wherein a plurality of groups of mutually independent power systems are arranged in the split type rack; the power system comprises a crank connecting rod mechanism, the crank connecting rod mechanism is connected with a plunger combination mechanism through a tappet rod, the tail end of the plunger combination mechanism is provided with a group of suction and discharge valve assemblies matched with the plunger combination mechanism, the suction and discharge valve assemblies are arranged in a cavity of a hydraulic cylinder part, are positioned at the upper side and the lower side of the tail end of the plunger combination mechanism and are respectively communicated with a suction pipeline and a discharge pipeline of the hydraulic cylinder part, and the suction and discharge valve assemblies are opened or closed according to suction and discharge strokes in the working process; the dustproof and engine oil emulsification preventing device is characterized in that a sealing dustproof and engine oil emulsification preventing device is installed at the port of the sliding channel of the split type rack, one end of the tappet rod is connected with the crank-link mechanism, and the other end of the tappet rod penetrates through the sealing dustproof and engine oil emulsification preventing device to be connected with the plunger combination mechanism.
The crank link mechanism comprises a crankshaft arranged at one end of the split type rack, a connecting rod is arranged on the crankshaft and connected with the tappet rod, the crankshaft drives the connecting rod to convert circular motion into linear motion, and the connecting rod drives the tappet rod to do linear reciprocating motion.
The end of the connecting rod is connected to the tappet by a cross pin.
The sealing dustproof engine oil emulsification preventing device comprises a sealing body and a tappet seal in contact with a tappet, wherein the tappet seal is hermetically arranged in the sealing body, and the outer edge of the tappet seal extends out of the sealing body; and the sealing body and the tappet rod seal are fixedly arranged at the port of the slideway through the pressing plate.
The outer edge of the tappet seal is of an inclined surface structure, the diameter of the tappet seal is smaller than the diameter of the outer circle of the tappet, and when the tappet does linear reciprocating motion, the tappet seal and the tappet are kept in an interference fit state.
The tappet seal is machined from polytetrafluoroethylene.
The suction and discharge valve assembly comprises a valve seat, a valve cover is arranged on the valve seat, a slidable valve plate is arranged between the valve seat and the valve cover, a flow channel is formed in the top of the valve cover, and a spring is arranged in the valve cover; when the plunger pump is in a suction stroke, a valve plate of a suction valve assembly in the suction valve assembly jumps to compress a spring, a gap is kept between the valve plate and a sealing surface of a valve seat, the suction valve assembly is in an opening state, so that a conveying medium finally enters a cavity of a hydraulic cylinder part and a stuffing box through a suction pipeline and the suction valve assembly, and a discharge valve assembly in the suction valve assembly is in a closing state; when the plunger pump is in a discharge stroke, a valve plate of a discharge valve assembly in the suction valve assembly jumps to compress a spring, the valve plate keeps a distance from a sealing surface of a valve seat, the discharge valve assembly is in an opening state, so that a conveying medium finally enters a discharge pipeline through the discharge valve assembly and a hydraulic cylinder part to realize the conveying of the medium, and at the moment, the suction valve assembly in the suction valve assembly is in a closing state.
And a corrugated elastic cushion is arranged between the valve seat and the valve cover.
The plunger combined mechanism comprises a positioning sleeve fixedly mounted with the hydraulic cylinder part, a stuffing box is mounted on the positioning sleeve through a compression nut, a cavity is formed in the centers of the positioning sleeve and the stuffing box, a plunger is arranged in the cavity, oil blocking and oil changing are mounted on the inner wall of the compression nut, and a filler, a spacer ring, a guide sleeve, an inner spring and a spring seat are mounted on the inner wall of the stuffing box.
The split type rack comprises a rack lower shell and a rack upper cover connected with the rack lower shell through a positioning pin and a fixing bolt.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a plunger pump, through installing sealed dustproof anti-engine oil emulsification device in the slideway port department of split type frame, can be when the tappet is linear reciprocating motion, sealed dustproof anti-engine oil emulsification device and tappet remain interference fit's state throughout, this state can be so that dust in the environment, impurity such as grains of sand can't follow the tappet motion and get into in the frame, secondly tappet in the sealed dustproof anti-engine oil emulsification device is sealed can realize automatic to because the medium splashes the crystallisate that forms on the tappet and clear up, guarantee the reliability of lubricating oil, device life has been increased.
Further, the utility model discloses well tappet seals and is processed into by non-metallic material, and the operation in-process can reduce the wearing and tearing to the tappet surface, promotes tappet life.
Furthermore, the valve component is of a combined structure, the suction valve and the discharge valve are universal, the production period of the valve group can be effectively shortened, and the storage variety of spare parts of a user can be reduced; the valve plate is made of non-metal high polymer materials, so that the strength of the valve plate is met, the weight of the valve plate is reduced, the impact of the valve plate on a valve seat is reduced in the working process of the valve plate, the service life of the valve group is effectively prolonged, and the noise pollution is reduced; the valve plate is produced by adopting a one-step forming technology, the production efficiency is effectively improved, the non-metal high polymer material has better corrosion resistance to the oilfield produced water, and meanwhile, the valve plate has proper hardness difference with the valve seat, so that the service life of the valve seat is prolonged.
Furthermore, the split type frame consists of a frame lower shell and a frame upper cover, the frame upper cover can be directly detached, hoisted and removed in the maintenance process of the novel plunger pump, parts such as a crosshead, a connecting rod and the like can be directly maintained, replaced and the like without detaching a crankshaft and the like, the maintenance difficulty and the workload are greatly reduced compared with the integral type frame, and the purpose of man-machine harmony is achieved; the design and manufacture of the split type rack meet the requirements of universalization and serialization, the split type rack has interchangeability, the lower rack shell and the upper rack cover can be maintained and replaced singly, the service life of the rack is greatly prolonged, and the use cost of a user is reduced.
Drawings
Fig. 1 is a schematic structural view of the plunger pump of the present invention;
fig. 2 is a top view of the plunger pump of the present invention;
FIG. 3 is a schematic structural view of the tappet sealing dustproof engine oil emulsification device of the present invention;
fig. 4 is a schematic structural view of the valve assembly of the present invention;
fig. 5 is a schematic structural view of the plunger assembly of the present invention.
In the figure, 1 — fixing bolt; 2, positioning pins; 3, a lower shell of the frame; 4, a bearing; 5-crankshaft; 6, connecting rods; 7-crosshead pin; 8, an upper cover of the frame; 9-a tappet; 10-sealing the dustproof and engine oil emulsification preventing device; 11-plunger assembly; 12-a suction valve assembly; 13-14-suction line; 15-a gland bolt; 16-a gland; 10-1-seal; 10-2-Yx seal; 10-3-pressing plate. 10-4-tappet sealing; 11-1-plunger; 11-2-oil shifting; 11-3-compression nut; 11-4-guide sleeve A; 11-5-a filler; 11-6-spacer ring; 11-7-a guide sleeve; 11-8-inner spring; 11-9-spring seats; 11-10-stuffing box; 11-12-plug; 11-13-positioning sleeve; 12-1-valve seat; 12-2-a corrugated resilient pad; 12-3-a valve plate; 12-4-valve bonnet; 12-5-spring.
Detailed Description
The present invention will be described in detail with reference to the drawings, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1 and 2, the utility model provides a plunger pump, which comprises a split frame and a hydraulic cylinder part 13 arranged at one side of the split frame, wherein a plurality of groups of mutually independent power systems are arranged in the split frame; the power system comprises a crank link mechanism, the crank link mechanism is connected with a plunger combination mechanism 11 through a tappet 9, the tail end of the plunger combination mechanism 11 is provided with a group of suction and discharge valve assemblies 12 matched with the plunger combination mechanism 11, the suction and discharge valve assemblies 12 are arranged in a cavity of a hydraulic cylinder part 13, are positioned at the upper side and the lower side of the tail end of the plunger combination mechanism 11 and are respectively communicated with a suction pipeline 14 and a discharge pipeline of the hydraulic cylinder part 13, and the suction and discharge valve assemblies 12 are opened or closed according to suction and discharge strokes in the working process; a sealing dustproof engine oil emulsification preventing device 10 is installed at the port of the slide way of the split type frame, one end of the tappet rod 9 is connected with the crank-link mechanism, and the other end of the tappet rod passes through the sealing dustproof engine oil emulsification preventing device 10 to be connected with a plunger combination mechanism 11
The crank link mechanism comprises a crankshaft 5 installed at one end of the split type rack, a connecting rod 6 is installed on the crankshaft 5, the connecting rod 6 is connected with a tappet rod 9, the crankshaft 5 rotates to drive the connecting rod 6 to convert circular motion into linear motion, and the connecting rod 6 drives the tappet rod 9 to do linear motion. In particular, the end of the connecting rod 6 is connected to a tappet 9 by means of a cross pin 7. The crankshaft 5 is connected with the split type rack through a bearing, and the crankshaft 5 is connected with a power input device as a power end of the plunger pump.
As shown in fig. 3, the sealing dustproof and engine oil emulsification preventing device 10 comprises a sealing body 10-1 and a tappet seal 10-4 in contact with a tappet 9, wherein the tappet seal 10-4 is sleeved in the sealing body 10-1, and the outer edge of the tappet seal extends out of the sealing body 10-1; the sealing body 10-1 and the tappet sealing body 10-4 are fixedly arranged at the port of the slideway through a pressing plate 10-3. Preferably, the outer edge of the tappet seal 10-4 is a slope structure, the diameter of the tappet seal 10-4 is smaller than the outer circle diameter of the tappet 9, and the tappet seal 10-4 and the tappet 9 are in an interference fit state when the tappet 9 makes a linear reciprocating motion. Wherein, Yx sealing element 10-2 is also arranged on the sealing body 10-1.
The tappet seal 10-4 is installed in the sealing body 10-1, part of the tappet seal 10-4 is exposed out of the sealing body 10-1, the front end of the tappet seal 10-4 is designed with a reasonable inclination, the size of the tappet seal is smaller than the size of an outer circle of the tappet, when the tappet 9 does linear reciprocating motion, the tappet seal 10-4 and the tappet 9 are always in an interference fit state, impurities such as dust, sand grains and the like in the environment cannot enter a rack along with the movement of the tappet in the state, and then the tappet seal 10-4 can automatically clean crystals formed by splashing a medium onto the tappet, so that the reliability of lubricating oil is guaranteed. Preferably, the tappet seal 10-4 is made of a non-metallic material, illustratively, polytetrafluoroethylene is processed in the present invention, so that the wear to the surface of the tappet 9 during operation can be reduced, and the service life of the tappet can be prolonged.
Specifically, as shown in fig. 4, the suction valve assembly 12 includes a valve seat 12-1, a valve cover 12-4 is mounted on the valve seat 12-1, a slidable valve plate 12-3 is mounted between the valve seat 12-1 and the valve cover 12-4, a flow passage is formed at the top of the valve cover 12-4, and a spring 12-5 is mounted in the valve cover 12-4. A corrugated elastic cushion 12-2 is arranged between the valve seat 12-1 and the valve cover 12-4. The valve plate 12-3 is made of a non-metal high polymer material, the weight of the valve plate is reduced while the strength of the valve plate is met, impact on a valve seat is reduced in the working process of the valve plate, the service life of the valve group is effectively prolonged, and noise pollution is reduced. In addition, the valve plate 12-3 is produced by adopting a one-step forming technology, the production efficiency is effectively improved, the non-metal high polymer material has better corrosion resistance to the produced water of the oil field, and meanwhile, the non-metal high polymer material has proper hardness difference with the valve seat 12-1, so that the service life of the valve seat is prolonged. When the plunger pump is in a suction stroke, a valve plate 12-3 of a suction valve assembly in the suction and discharge valve assembly 12 jumps to enable a spring 12-5 to be compressed, a gap is kept between the valve plate 12-3 and a sealing surface of a valve seat 12-1, the suction valve assembly is in an open state, so that a conveying medium passes through a suction pipeline 14 and the suction valve assembly and finally enters a hydraulic cylinder part 13 and a stuffing box cavity, and a discharge valve assembly in the suction and discharge valve assembly 12 is in a closed state; when the plunger pump is in a discharge stroke, a valve plate 12-3 of a discharge valve assembly in the suction valve assembly 12 jumps to enable a spring 12-5 to be compressed, the valve plate 12-3 keeps a distance with a sealing surface of a valve seat 12-1, the discharge valve assembly is in an opening state, so that a conveying medium passes through the discharge valve assembly and a hydraulic cylinder part 13 and finally enters a discharge pipeline to realize the conveying of the medium, and at the moment, a suction valve assembly in the suction valve assembly 12 is in a closing state.
As shown in fig. 5, preferably, the plunger combination mechanism 11 comprises a positioning sleeve 11-13 fixedly mounted with the hydraulic cylinder member 13, a stuffing box 11-10 is mounted on the positioning sleeve 11-13 through a compression nut 11-3, a cavity is formed in the centers of the positioning sleeve 11-13 and the stuffing box 11-10, a plunger 11-1 is arranged in the cavity, an oil blocking ring 11-2 is mounted on the inner wall of the compression nut 11-3, a stuffing 11-5, a spacer ring 11-6, a guide sleeve 11-7, an in-sleeve spring 11-8, a spring seat 11-9 and the stuffing box 11-10 are mounted on the inner wall of the stuffing box 11-10, and a plug screw 11-12 is arranged at the tail end of the plunger 11-1; the end of the plunger 11-1 is fixedly sealed with the hydraulic cylinder part 13 through a gland. The top of the hydraulic cylinder part 13 is also fixed by a gland and gland bolt 15.
Preferably, the split type rack comprises a rack lower shell 3 and a rack upper cover 8 connected with the rack lower shell 3 through a positioning pin 2 and a fixing bolt 1. The split type rack consists of a rack lower shell 3 and a rack upper cover 8, the rack upper cover can be directly detached, hoisted and removed in the maintenance process of the plunger pump, parts such as a crosshead pin 7, a connecting rod 6 and the like can be directly maintained, replaced and the like without detaching a crankshaft 5 and the like, the maintenance difficulty and the workload are greatly reduced compared with the integral rack, and the purpose of harmony between man and machine is achieved; the design and the manufacture of the split type rack meet the requirements of universalization and serialization, the split type rack has interchangeability, the lower rack shell and the upper rack cover can be maintained and replaced singly, the service life of the rack is greatly prolonged, and the use cost of a user is reduced.
The utility model discloses a working process and principle do:
the crankshaft 5 is driven by power to do circular motion, the movable connecting rod 6 is driven to convert the circular motion into linear motion, the connecting rod 6 drives the tappet rod 9 to do linear reciprocating motion, and further drives the plunger combination mechanism to do telescopic motion, the plunger combination mechanism does work on a medium, in a suction stroke of the plunger pump, a valve plate 12-3 of a suction valve assembly 12 in the suction and discharge valve assembly 12 jumps to compress a spring 12-5, the valve plate 12-3 keeps a certain distance from a sealing surface of a valve seat 12-1, the suction valve assembly is in an open state, so that a conveying medium finally enters a hydraulic cylinder assembly 13 and a stuffing box cavity through a suction pipeline 14 and the suction valve assembly, and at the moment, a discharge valve assembly in the suction and discharge valve assembly 12 is in a closed state; in the discharge stroke of the plunger pump, a valve plate 12-3 of a discharge valve assembly in the suction valve assembly 12 jumps to compress a spring 12-5, a certain distance is kept between the valve plate 12-3 and a sealing surface of a valve seat 12-1, and the discharge valve assembly is in an open state, so that a conveying medium finally enters a discharge pipeline through the discharge valve assembly and a hydraulic cylinder part 13 to realize the conveying purpose of the medium, and at the moment, a suction valve assembly in the suction valve assembly 12 is in a closed state to finish the working process of the plunger pump.
It should be apparent to those skilled in the art that the above embodiments are only preferred embodiments of the present invention, and therefore, the modifications and changes that can be made by those skilled in the art to some parts of the present invention still embody the principles of the present invention, and the objects of the present invention are achieved, all falling within the scope of the present invention.
Claims (10)
1. A plunger pump is characterized by comprising a split type rack and a hydraulic cylinder part (13) arranged on one side of the split type rack, wherein a plurality of groups of mutually independent power systems are arranged in the split type rack; the power system comprises a crank link mechanism, the crank link mechanism is connected with a plunger combination mechanism (11) through a tappet (9), the tail end of the plunger combination mechanism (11) is provided with a group of suction and discharge valve assemblies (12) matched with the plunger combination mechanism (11), the suction and discharge valve assemblies (12) are arranged in a cavity of a hydraulic cylinder piece (13), are positioned on the upper side and the lower side of the tail end of the plunger combination mechanism (11) and are respectively communicated with a suction pipeline (14) and a discharge pipeline of the hydraulic cylinder piece (13), and the suction and discharge valve assemblies (12) are opened or closed according to suction and discharge strokes in the working process; the dustproof and engine oil-proof sealing mechanism is characterized in that a sealing dustproof and engine oil-proof emulsifying device (10) is installed at the port of the sliding channel of the split type rack, one end of a tappet rod (9) is connected with a crank-link mechanism, and the other end of the tappet rod penetrates through the sealing dustproof and engine oil-proof emulsifying device (10) to be connected with a plunger combined mechanism (11).
2. The plunger pump according to claim 1, characterized in that the crank-link mechanism comprises a crankshaft (5) mounted at one end of the split frame, a connecting rod (6) is mounted on the crankshaft (5), the connecting rod (6) is connected with the tappet rod (9), the crankshaft (5) rotates to drive the connecting rod (6) to convert the circular motion into the linear motion, and the connecting rod (6) drives the tappet rod (9) to do the linear reciprocating motion.
3. Plunger pump according to claim 2, characterised in that the end of the connecting rod (6) is connected with the tappet (9) by means of a cross pin (7).
4. The plunger pump according to claim 1, characterized in that the sealing dustproof and engine oil emulsification device (10) comprises a sealing body (10-1) and a tappet seal (10-4) which is in contact with the tappet (9), wherein the tappet seal (10-4) is sleeved in the sealing body (10-1), and the outer edge of the tappet seal extends out of the sealing body (10-1); the sealing body (10-1) and the tappet sealing body (10-4) are fixedly arranged at the port of the slideway through a pressing plate (10-3).
5. The plunger pump according to claim 4, characterized in that the outer edge of the tappet seal (10-4) is a slope structure, the diameter of the tappet seal (10-4) is smaller than the outer circle diameter of the tappet (9), and the tappet seal (10-4) and the tappet (9) are in an interference fit state when the tappet (9) makes a linear reciprocating motion.
6. Plunger pump according to claim 4, characterised in that the tappet seal (10-4) is machined from polytetrafluoroethylene.
7. The plunger pump according to claim 1, wherein the suction valve assembly (12) comprises a valve seat (12-1), a valve cover (12-4) is mounted on the valve seat (12-1), a slidable valve plate (12-3) is mounted between the valve seat (12-1) and the valve cover (12-4), a flow passage is formed in the top of the valve cover (12-4), and a spring (12-5) is mounted in the valve cover (12-4); when the plunger pump is in a suction stroke, a valve plate (12-3) of a suction valve assembly in the suction valve assembly (12) jumps to compress a spring (12-5), a gap is kept between the valve plate (12-3) and a sealing surface of a valve seat (12-1), the suction valve assembly is in an open state, so that a conveying medium passes through a suction pipeline (14) and the suction valve assembly and finally enters a liquid cylinder part (13) and a stuffing box cavity, and a discharge valve assembly in the suction valve assembly (12) is in a closed state; when the plunger pump is in a discharge stroke, a valve plate (12-3) of a discharge valve assembly (12) in the suction valve assembly (12) jumps to enable a spring (12-5) to be compressed, the valve plate (12-3) keeps a distance with a sealing surface of a valve seat (12-1), the discharge valve assembly is in an open state, so that a conveying medium passes through the discharge valve assembly and a hydraulic cylinder part (13) and finally enters a discharge pipeline to realize the conveying of the medium, and at the moment, a suction valve assembly in the suction valve assembly (12) is in a closed state.
8. Plunger pump according to claim 7, characterised in that a corrugated elastic pad (12-2) is mounted between the valve seat (12-1) and the valve cover (12-4).
9. The plunger pump according to claim 1, characterized in that the plunger combination mechanism (11) comprises a positioning sleeve (11-13) fixedly mounted with the hydraulic cylinder member (13), a stuffing box (11-10) is mounted on the positioning sleeve (11-13) through a compression nut (11-3), a cavity is formed in the centers of the positioning sleeve (11-13) and the stuffing box (11-10), a plunger (11-1) is arranged in the cavity, an oil blocking switch (11-2) is mounted on the inner wall of the compression nut (11-3), and a filler (11-5), a spacer ring (11-6), a guide sleeve (11-7), an inner spring (11-8) and a spring seat (11-9) are mounted on the inner wall of the stuffing box (11-10).
10. Plunger pump according to any of claims 1-8, characterized in that the split frame comprises a lower frame shell (3) and an upper frame cover (8) connected to the lower frame shell (3) by means of positioning pins (2) and fixing bolts (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022794524.6U CN213711253U (en) | 2020-11-27 | 2020-11-27 | Plunger pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022794524.6U CN213711253U (en) | 2020-11-27 | 2020-11-27 | Plunger pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213711253U true CN213711253U (en) | 2021-07-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022794524.6U Active CN213711253U (en) | 2020-11-27 | 2020-11-27 | Plunger pump |
Country Status (1)
| Country | Link |
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| CN (1) | CN213711253U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046243A (en) * | 2021-11-10 | 2022-02-15 | 宝鸡航天动力泵业有限公司 | Sand prevention sealing device for plunger of horizontal directional drilling mud pump |
-
2020
- 2020-11-27 CN CN202022794524.6U patent/CN213711253U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046243A (en) * | 2021-11-10 | 2022-02-15 | 宝鸡航天动力泵业有限公司 | Sand prevention sealing device for plunger of horizontal directional drilling mud pump |
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