CN216665885U

CN216665885U - Sealing assembly of plunger pump and plunger pump

Info

Publication number: CN216665885U
Application number: CN202123138724.7U
Authority: CN
Inventors: 邓文杰; 菅保国; 刘韦辰; 李朋; 张树林; 王继鑫
Original assignee: Yantai Jereh Petroleum Equipment and Technologies Co Ltd
Current assignee: Yantai Jereh Petroleum Equipment and Technologies Co Ltd
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-06-03
Anticipated expiration: 2031-12-14

Abstract

The utility model discloses a sealing assembly of a plunger pump and the plunger pump, wherein the plunger pump comprises a power end shell and a tappet, the power end shell is provided with a mounting hole, the sealing assembly is used for sealing the power end shell and the tappet, and the sealing assembly comprises a sealing seat, a first oil seal, a second oil seal and an elastic retainer ring; the sealing seat is positioned in the mounting hole, the mounting hole is a stepped hole, the sealing seat is abutted against the step surface of the stepped hole, a clamping groove is formed in the side wall of the mounting hole, the elastic check ring is clamped and matched with the clamping groove, the elastic check ring is abutted against one end of the sealing seat, and the stepped surface and the elastic check ring clamp and fix the sealing seat; the through-hole has been seted up along the axis direction of mounting hole to the seal receptacle, and the tappet passes the through-hole, and the first recess that sets up along seal receptacle circumference is seted up to the lateral wall of through-hole, and the part of first oil blanket and the part of second oil blanket all are located first recess, and seal receptacle and tappet pass through first oil blanket and second oil blanket sealing connection, and the lip of first oil blanket is opposite with the lip orientation of second oil blanket.

Description

Sealing assembly of plunger pump and plunger pump

Technical Field

The utility model relates to the technical field of plunger pump sealing, in particular to a sealing assembly of a plunger pump and the plunger pump.

Background

The plunger pump is the main equipment for pumping the fracturing medium under high pressure in the fracturing process of oil and gas fields. The plunger pump comprises a power end shell, a crankshaft, a tappet rod, a plunger and other components, wherein the crankshaft is located in the power end shell, a mounting hole is formed in the power end shell, one end of the tappet rod penetrates through the mounting hole to be located in the power end shell and connected with the crankshaft, and the other end of the tappet rod is located outside the power end shell and connected with the plunger. The crankshaft drives the tappet to move back and forth, so that the tappet drives the plunger to move back and forth, and liquid suction and liquid discharge of the plunger pump are realized.

In order to ensure smooth rotation between the crankshaft and the parts connected with the crankshaft, lubricating oil is filled in the power end shell, so that the crankshaft and the parts connected with the crankshaft are lubricated. However, the lubricating oil easily leaks from the gap between the tappet and the mounting hole. In order to prevent the lubricating oil from leaking out of the power end housing, a seal assembly is often provided at the mounting hole, by which the lubricating oil is prevented from leaking along the gap between the tappet and the power end housing.

In the related art, the sealing assembly is fixed on the power end shell through a plurality of bolts, at the moment, in the process of mounting or dismounting the sealing assembly, the sealing assembly can be mounted or dismounted only by screwing the plurality of bolts, and the plurality of bolts are screwed for a long time, so that the time spent on dismounting the sealing assembly is long, the dismounting is inconvenient, and the dismounting difficulty of the sealing assembly is large.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a sealing assembly of a plunger pump, which aims to solve the problem that the assembly and disassembly difficulty of the sealing assembly is high.

In order to solve the problems, the utility model adopts the following technical scheme:

a sealing assembly of a plunger pump comprises a power end shell and a tappet, wherein the power end shell is provided with a mounting hole, the sealing assembly is arranged in the mounting hole and used for sealing the power end shell and the tappet, and the sealing assembly comprises a sealing seat, a first oil seal, a second oil seal and an elastic retainer ring;

the sealing seat is positioned in the mounting hole, the mounting hole is a stepped hole, the sealing seat is abutted against the stepped surface of the stepped hole, a clamping groove is formed in the side wall of the mounting hole, the elastic check ring is clamped and matched with the clamping groove, the elastic check ring is abutted against one end of the sealing seat, and the stepped surface and the elastic check ring clamp and fix the sealing seat;

the seal receptacle is followed the axis direction of mounting hole has seted up the through-hole, the tappet passes the through-hole, the edge has been seted up to the lateral wall of through-hole the first recess that seal receptacle circumference set up, the part of first oil blanket with the part of second oil blanket all is located in the first recess, the seal receptacle with the tappet passes through first oil blanket with second oil blanket sealing connection, the lip of first oil blanket with the lip orientation of second oil blanket is opposite.

A plunger pump comprises the sealing assembly.

The technical scheme adopted by the utility model can achieve the following beneficial effects:

in the sealing assembly disclosed by the utility model, the sealing seat is abutted against the step surface of the stepped hole, the side wall of the mounting hole is provided with the clamping groove, the elastic check ring is in clamping fit with the clamping groove, the elastic check ring is abutted against one end of the sealing seat, and the step surface and the elastic check ring clamp and fix the sealing seat. In this scheme, seal assembly is at the in-process of installation, pack into the draw-in groove with the circlip in to make circlip and seal receptacle looks butt, at this moment, the seal receptacle centre gripping is between step face and circlip, thereby realizes seal assembly's fixed mounting. When the sealing assembly is disassembled, the elastic check ring in the clamping groove is taken out, so that the sealing seat is not blocked, and the sealing seat can be taken out from the mounting hole. This application is for adopting a plurality of bolt fastening's mode, and the time that the seal assembly dismouting spent is shorter, and the dismouting is more convenient, and consequently seal assembly's the dismouting degree of difficulty is less.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model. In the drawings:

fig. 1 and fig. 2 are partial structural schematic views of a plunger pump disclosed in the embodiment of the utility model;

FIG. 3 is an exploded view of a seal assembly according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a seal seat of a seal assembly according to an embodiment of the disclosure;

fig. 5 is a cross-sectional view of fig. 4.

Description of reference numerals:

100-sealing component, 110-sealing seat, 111-first groove, 112-sealing groove, 113-second groove, 114-oil storage groove, 115-threaded hole, 110 a-first sealing segment, 110 b-second sealing segment, 120-first oil seal, 130-second oil seal, 140-elastic retainer ring, 141-notch, 150-sealing ring, 160-oil scraper ring, 112-oil seal groove,

200-power end shell,

300-tappet.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

The technical solutions disclosed in the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

As shown in fig. 1 to 5, the embodiment of the utility model discloses a sealing assembly 100 of a plunger pump. The plunger pump comprises a power end housing 200 and a tappet 300, wherein the power end housing 200 is provided with a mounting hole, a sealing assembly 100 is arranged in the mounting hole, and the sealing assembly 100 is used for sealing the power end housing 200 and the tappet 300. The disclosed seal assembly 100 includes a seal housing 110, a first oil seal 120, a second oil seal 130, and a circlip 140.

The seal housing 110 is located within the mounting hole. The mounting hole is a stepped hole, and the seal holder 110 abuts against a stepped surface of the stepped hole. The side wall of the mounting hole is provided with a clamping groove, and the elastic retainer ring 140 is clamped and matched with the clamping groove. The circlip 140 abuts against one end of the seal holder 110. Specifically, when the elastic collar 140 is clamped into the clamping groove, a portion of the elastic collar 140 protrudes out of the clamping groove and abuts against an end surface of the seal seat 110, so as to limit the seal seat 110. The stepped surface and the circlip 140 sandwich the stationary seal holder 110. At this time, a portion of the sealing seat 110 is clamped in the elastic collar 140 and the clamping groove, so that the sealing seat 110 is fixedly installed.

During installation of the seal assembly 100, the seal housing 110 is first installed into the mounting hole such that the seal housing 110 abuts the step surface. The circlip 140 is then snapped into the snap groove, with portions of the circlip 140 protruding out of the snap groove and abutting against the end face of the seal housing 110, thereby completing the installation of the seal assembly 100.

In the process of disassembling the sealing assembly 100, the elastic collar 140 in the clamping groove is firstly taken out, the sealing seat 110 has no limit stop, and the sealing seat 110 can be taken out from the mounting hole, so that the sealing seat 110 is disassembled.

This application for adopting a plurality of bolt fastening's mode, adopt a plurality of bolts when the installation, need twist to twist every bolt and operate, consequently need operating personnel to carry out a plurality of repetitive operation, operating time is long, and the degree of difficulty is great. And in the embodiment disclosed in this application, when circlip 140 when the installation, operating personnel compress circlip 140 for circlip 140 takes place slight deformation, then will take place slight deformation circlip 140 and put into the draw-in groove, when operating personnel removed external force, circlip 140 resumes elastic deformation, thereby the joint is in the draw-in groove, supports simultaneously and leans on the mount pad, thereby realizes fixing the mount pad. The sealing assembly 100 in the application does not need to be repeatedly operated, so that the time spent on dismounting the sealing assembly 100 is shorter, the dismounting is more convenient, and the dismounting difficulty of the sealing assembly 100 is smaller.

In addition, because the distance between the power end housing 200 and the plunger is small, the operating space reserved for the operator is limited. When the seal assembly 100 employs a fixing manner of a plurality of bolts, the bolts are long in length and thus easily interfere with the plunger, thereby causing inconvenience in operation. In the embodiment disclosed in the present application, the thickness of the circlip 140 is small, and the required operation space is small, so that interference with the plunger is not easy to occur, and the operation is more convenient.

In addition, when a plurality of bolts are used for fixing, the tappet 300 may damage the bolt hole connected with the bolt in the moving process, and the bolt may loosen, so that the sealing performance is low. In the embodiment disclosed in the present application, the circlip 140 abuts against the seal seat 110, so that the seal assembly 100 is not easily loosened, and the sealing performance is better.

In another alternative embodiment, the seal holder 110 is provided with a through hole along the axial direction of the mounting hole, and the tappet 300 passes through the through hole. Specifically, the tappet 300 may move in the axial direction of the through hole. The side wall of the through hole is provided with a first groove 111 arranged along the circumference of the seal base 110, the part of the first oil seal 120 and the part of the second oil seal 130 are both positioned in the first groove 111, and the seal base 110 is connected with the tappet 300 in a sealing way through the first oil seal 120 and the second oil seal 130. Wherein the lip of the first oil seal 120 faces opposite to the lip of the second oil seal 130. That is, of the first oil seal 120 and the second oil seal 130, the lip of one oil seal faces the outside of the power end housing 200, and the lip of the other oil seal faces the inside of the power end housing 200.

In this embodiment, a double oil seal structure is adopted, so that the sealing performance between the seal holder 110 and the tappet 300 can be improved. Meanwhile, the lip of one of the oil seals faces the outside of the power end housing 200, and the lip of the other oil seal faces the inside of the power end housing 200. The oil blanket of the inboard of lip orientation power end casing 200 can prevent that the lubricating oil in the power end casing 200 from leaking outward, and the oil blanket of the outside of lip orientation power end casing 200 can prevent that outside impurity from entering into power end casing 200 inside to avoid lubricating oil to take place to deteriorate because impurity influences, and then improve the lubricating property of plunger pump.

In the above embodiment, the seal holder 110 abuts against the step surface of the stepped hole, and the outer side surface of the seal holder 110 is in contact with the step surface, so that the outer side surface of the seal holder 110 and the step surface can be relatively sealed, thereby preventing the leakage of the lubricating oil.

In order to further improve the sealing performance between the seal holder 110 and the power end housing 200, in another alternative embodiment, the seal assembly 100 may further include a seal ring 150, and an outer side surface of the seal holder 110 may be provided with a seal groove 112 disposed along the circumferential direction of the seal holder 110. Portions of the seal ring 150 may be located within the seal groove 112 and the power end housing 200 may be sealingly connected to the seal housing 110 via the seal ring 150. In this scheme, power end casing 200 passes through sealing washer 150 sealing connection with seal receptacle 110 to can further improve the sealing performance between power end casing 200 and the seal receptacle 110, and then further prevent the lubricating oil risk of revealing.

In the above embodiment, the tappet 300 is easy to pull the first oil seal 120 and the second oil seal 130 to move relatively during the moving process, and then the first oil seal 120 and the second oil seal 130 collide, so that the first oil seal 120 and the second oil seal 130 are damaged.

Based on this, in another alternative embodiment, the first groove 111 may have opposite first and second sidewalls, and the lip of the first oil seal 120 may abut against the first sidewall. The lip of the second oil seal 130 may abut the second side wall. The side of the first oil seal 120 facing away from its lip may abut the side of the second oil seal 130 facing away from its lip. At this time, the first oil seal 120 and the second oil seal 130 are limited in the first groove 111, so that the first oil seal 120 and the second oil seal 130 cannot slide, and therefore the first oil seal 120 and the second oil seal 130 are not easy to damage, and the safety and reliability of the sealing assembly 100 are improved.

Further, the first oil seal 120 and the second oil seal 130 may be symmetrically disposed along the center plane of the first groove 111. The first oil seal 120 and the second oil seal 130 may be identical in structure.

In another alternative embodiment, the seal holder 110 may include a first seal segment 110a and a second seal segment 110b, the first seal segment 110a may have an outer diameter greater than an outer diameter of the second seal segment 110b, and the first seal segment 110a and the second seal segment 110b may be sequentially distributed in a direction from an outer side of the power end housing 200 to an inner side of the power end housing 200. The second sealing section 110b is adjacent the inside of the power end housing 200 and the first sealing section 110a is adjacent the outside of the power end housing 200.

The end of the first seal segment 110a adjacent to the second seal segment 110b abuts against the step surface, and the end of the first seal segment 110a facing away from the second seal segment 110b abuts against the circlip 140.

In this scheme, seal receptacle 110 is the stair structure, and the lateral wall of seal receptacle 110 is the stair structure, and the structure of seal receptacle 110 and the structure phase-match of mounting hole, consequently seal receptacle 110 and mounting hole have better fitting surface to can improve the cooperation precision of seal receptacle 110 and mounting hole, can also improve the sealing performance of seal receptacle 110 and power end casing 200 simultaneously.

Alternatively, since the second seal segment 110b is close to the inner side of the power end housing 200, the seal groove 112 may be opened on the second seal segment 110b, so as to block the lubricating oil at the inner side of the power end housing 200, and further avoid the lubricating oil from leaking out.

In order to further avoid the leakage of the lubricating oil, in another alternative embodiment, the sealing assembly 100 may further include an oil scraper ring 160, a sidewall of the through hole may be opened with a second groove 113 disposed along the circumferential direction of the sealing seat 110, and the first groove 111 and the second groove 113 may be spaced apart from each other in a direction from the outer side of the power end housing 200 to the inner side of the power end housing 200. A portion of the oil scraper ring 160 is located in the second groove 113, and the oil scraper ring 160 may contact the sidewall of the tappet 300.

In this embodiment, during the movement of the tappet 300, the tappet 300 moves corresponding to the oil scraper ring 160, so the oil scraper ring 160 can scrape off the lubricating oil adhered to the side wall of the tappet 300, thereby further preventing the lubricating oil from leaking.

In the above embodiment, the lip of the first oil seal 120 faces the outside of the power end housing 200, the lip of the second oil seal 130 faces the inside of the power end housing 200, and the lubricating oil blocked by the second oil seal 130 is collected between the second oil seal 130 and the oil scraper ring 160. During long-term operation of the tappet 300, more lubricating oil is accumulated between the second oil seal 130 and the oil scraper ring 160, and at this time, more lubricating oil is adhered to the tappet 300, and the lubricating oil is more likely to leak out of the power end housing 200, which results in a reduction in the sealing performance of the seal assembly 100.

Based on this, in another alternative embodiment, the sidewall of the through hole may be opened with an oil reservoir 114 disposed along the circumferential direction of the seal seat 110, and the oil reservoir 114 may be located between the first groove 111 and the second groove 113. In this scheme, the lubricating oil that is blockked by second oil blanket 130 can be deposited in oil storage tank 114, and at this moment, lubricating oil is located oil storage tank 114, so lubricating oil is difficult to adhere to on tappet 300 to prevent lubricating oil seepage to outside power end housing 200, and then improve seal assembly 100's sealing performance.

In the above embodiment, the elastic collar 140 may have an annular sheet structure, but may have other annular structures.

The deformation of the annular structure is small, and the elastic check ring 140 is easy to interfere with the inner wall of the mounting hole due to the small deformation when being mounted, so that the elastic check ring 140 is difficult to mount in place.

In view of this, in another alternative embodiment, one side of the circlip 140 is opened with a slit 141 running through it in the axial direction. At this time, the deformation amount of the elastic collar 140 can be increased by the notch 141, so that the deformation amount of the elastic collar 140 is large, and the elastic collar 140 is convenient to detach and mount.

In order to facilitate the removal of the seal holder 110 from the mounting hole, in another alternative embodiment, the seal holder 110 may be provided with a removal portion on an end surface facing the outside of the power end housing 200, and the seal holder 110 may be removed from the mounting hole through the removal portion. In this solution, the detaching portion provides a point of application for detaching the seal receptacle 110, so that an operator can apply an application force to the point of application, thereby taking out the seal receptacle 110 from the mounting hole.

Alternatively, the detaching portion may be a protrusion protruding from the end surface of the seal holder 110, or may be a groove opened in the end surface of the seal holder 110.

In another alternative embodiment, the detachment portion may be a threaded hole 115. In a specific operation, when the seal housing 110 is disassembled, the bolt or the stud may be screwed into the threaded hole 115, and an operator may apply a force to the bolt and the stud to remove the mount. In this scheme, screw hole 115 processing is convenient, and occupation space is less, is difficult to cause the influence to the sealing performance of seal receptacle 110. In addition, the bolt and the stud are standard parts, so the bolt and the stud do not need to be manufactured separately, and a disassembling tool does not need to be equipped for the sealing assembly 100 separately.

Optionally, the number of the threaded holes 115 may be two, and the two threaded holes 115 are distributed on two sides of the end surface of the seal seat 110, so that the stress is balanced in the process of detaching the seal seat 110.

In the above embodiment, in order to improve the assembling performance of the seal assembly 100, a chamfer is provided on a side of the seal holder 110 facing the inside of the power end housing 200, so as to facilitate the installation of the seal holder 110 with the mounting hole, thereby improving the assembling performance of the seal assembly 100 with the power end housing 200.

Based on the sealing assembly 100 of any one of the above embodiments of the present application, the embodiment of the present application further discloses a plunger pump, and the disclosed plunger pump has the sealing assembly 100 of any one of the above embodiments.

In the above embodiments of the present invention, the difference between the embodiments is mainly described, and different optimization features between the embodiments can be combined to form a better embodiment as long as they are not contradictory, and further description is omitted here in view of brevity of the text.

The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A seal assembly of a plunger pump, the plunger pump comprising a power end housing (200) and a tappet (300), the power end housing (200) being provided with a mounting hole, the seal assembly (100) being provided in the mounting hole, the seal assembly (100) being for sealing the power end housing (200) and the tappet (300), characterized in that the seal assembly (100) comprises a seal receptacle (110), a first oil seal (120), a second oil seal (130) and a circlip (140);

the sealing seat (110) is positioned in the mounting hole, the mounting hole is a stepped hole, the sealing seat (110) abuts against a stepped surface of the stepped hole, a clamping groove is formed in the side wall of the mounting hole, the elastic check ring (140) is clamped and matched with the clamping groove, the elastic check ring (140) abuts against one end of the sealing seat (110), and the stepped surface and the elastic check ring (140) clamp and fix the sealing seat (110);

the seal receptacle (110) is followed the through-hole has been seted up to the axis direction of mounting hole, tappet (300) pass the through-hole, the edge has been seted up to the lateral wall of through-hole first recess (111) that seal receptacle (110) circumference set up, the part of first oil blanket (120) with the part of second oil blanket (130) all is located in first recess (111), seal receptacle (110) with tappet (300) pass through first oil blanket (120) with second oil blanket (130) sealing connection, the lip of first oil blanket (120) with the lip orientation of second oil blanket (130) is opposite.

2. The seal assembly according to claim 1, wherein the seal assembly (100) further comprises a seal ring (150), a seal groove (112) is formed in an outer side surface of the seal seat (110) and circumferentially arranged along the seal seat (110), a portion of the seal ring (150) is located in the seal groove (112), and the power end housing (200) and the seal seat (110) are hermetically connected through the seal ring (150).

3. The seal assembly according to claim 1, wherein the first recess (111) has opposite first and second side walls, the lip of the first oil seal (120) abuts against the first side wall, the lip of the second oil seal (130) abuts against the second side wall, and a side of the first oil seal (120) facing away from the lip abuts against a side of the second oil seal (130) facing away from the lip.

4. The seal assembly of claim 1, wherein the seal housing (110) comprises a first seal segment (110a) and a second seal segment (110b), the first seal segment (110a) having an outer diameter greater than an outer diameter of the second seal segment (110b), the first seal segment (110a) and the second seal segment (110b) being sequentially distributed in a direction from an outside of the power end housing (200) to an inside of the power end housing (200);

one end, close to the second sealing section (110b), of the first sealing section (110a) abuts against the step surface, and one end, away from the second sealing section (110b), of the first sealing section (110a) abuts against the elastic check ring (140).

5. The seal assembly according to claim 1, wherein the seal assembly (100) further comprises a scraper ring (160), a side wall of the through hole is provided with a second groove (113) arranged along the circumferential direction of the seal holder (110), the first groove (111) and the second groove (113) are distributed at intervals along the direction from the outer side of the power end housing (200) to the inner side of the power end housing (200), a part of the scraper ring (160) is located in the second groove (113), and the scraper ring (160) is in contact with the side wall of the tappet (300).

6. The seal assembly according to claim 5, wherein the side wall of the through hole is provided with an oil storage groove (114) arranged along the circumferential direction of the seal seat (110), and the oil storage groove (114) is positioned between the first groove (111) and the second groove (113).

7. A seal assembly according to claim 1, wherein one side of the circlip (140) is provided with a slit (141) running axially through it.

8. The seal assembly according to claim 1, characterized in that a removal portion is provided on an end face of the seal holder (110) facing the outside of the power end housing (200), through which removal portion the seal holder (110) is removed from within the mounting hole.

9. The seal assembly of claim 8, wherein the relief is a threaded hole (115).

10. A plunger pump, characterized in that it comprises a sealing assembly according to any one of claims 1 to 9.