CN209908747U

CN209908747U - Combined sealing assembly of plunger pump

Info

Publication number: CN209908747U
Application number: CN201920282638.7U
Authority: CN
Inventors: 李向志; 周生俊
Original assignee: PHILIP AUTOMATION (SHENYANG) Co Ltd
Current assignee: PHILIP AUTOMATION (SHENYANG) Co Ltd
Priority date: 2019-03-06
Filing date: 2019-03-06
Publication date: 2020-01-07
Anticipated expiration: 2029-03-06

Abstract

The utility model relates to a combined seal subassembly of plunger pump, between its piston rod upper portion and the pump tube, be equipped with the support ring between piston rod bottom disk seat and the pump tube respectively, the support ring is cup jointed by the stack of a plurality of V type sealing washers and is in the same place, the interior seal angle 80 that two internal surfaces of V type sealing washer formed, the external seal angle 90 that two surfaces formed, interior seal face, external seal face top form respectively scrapes the closed angle, be equipped with the annular groove on interior seal face, the external seal face respectively. The extrusion force on the upper part of the opening of the V-shaped sealing ring is the largest, and liquid materials are not easy to permeate into the gap between two adjacent layers of V-shaped sealing rings; in the up-and-down moving process of the piston rod, the scraping sharp corner scrapes materials, the inner sealing surface is not in close contact with the piston rod, and the abrasion of the crystals to the V-shaped sealing ring is reduced; crystals scraped by the scraping sharp corner are stored in the annular groove, so that the abrasion of the crystals to the V-shaped sealing ring is reduced.

Description

Combined sealing assembly of plunger pump

Technical Field

The utility model relates to a material pump technical field, concretely relates to combined seal subassembly of plunger pump.

Background

The high-pressure polyurethane high-viscosity liquid pumping pump mostly adopts a plunger pump, the sealing requirement of the plunger pump is very high in order to keep the pump to run stably, and the sealing life of the sealing ring is short due to the fact that the polyurethane raw material is easy to crystallize and the crystallized material is easy to scale on the sealing ring. In the process of conveying materials by the pump body, thin layers of raw material liquid can be attached to the surfaces of the sealing ring, the piston rod and the hydraulic cylinder, after the pump body stops working, raw material is crystallized, and when the pump body runs again, the sealing ring can be gradually damaged under the abrasion of crystallized particles, particularly when the sealing surface is a plane, the sealing surface is tightly combined with the piston rod, and solid substances can damage the sealing surface very quickly.

Disclosure of Invention

An object of the utility model is to solve above-mentioned problem, provide the combined seal subassembly of plunger pump, it is convenient for strike off the material on the piston rod to store the crystalline substance in the annular groove, reduce the wearing and tearing between sealed face and the piston rod.

In order to solve the above problem, the utility model discloses a technical scheme as follows:

a combined sealing component of a plunger pump is characterized in that a plurality of V-shaped sealing rings 31 are overlapped and sleeved together to form a supporting ring 3 between the upper portion of a piston rod 1 and a pumping pipe 2, an inner sealing angle formed by two inner surfaces of each V-shaped sealing ring 31 is 80 degrees, an outer sealing angle formed by two outer surfaces of each V-shaped sealing ring 31 is 90 degrees, a downward inclined plane at the top of an inner sealing surface 311 and an outer sealing surface 312 of each V-shaped sealing ring forms scraping sharp corners 313 with inner sealing surfaces and outer sealing surfaces on two sides respectively, an included angle formed by the inclined plane 314 and a symmetrical axis of the section of each V-shaped sealing ring is 100 degrees, an included angle formed by the inclined plane 314 and the outer sealing surface or the inner sealing surface on the same side is 108 degrees, annular grooves 315 are formed in the inner sealing surface 311 and the outer sealing surface 312 respectively, and the end faces.

Further, the opening of the V-shaped sealing ring of the support ring between the upper part of the piston rod 1 and the pumping pipe 2 faces downwards, and the opening of the V-shaped sealing ring of the support ring between the valve seat 4 at the bottom of the piston rod and the pumping pipe 2 faces upwards.

Compared with the prior art, the utility model discloses favourable effect does:

(1) the inner sealing angle of the V-shaped sealing ring is 80 degrees, the outer sealing angle of the V-shaped sealing ring 31 is 90 degrees, the V-shaped sealing rings are overlapped and sleeved together, the upper V-shaped sealing ring extrudes the lower V-shaped sealing ring, the extrusion force on the upper part of the opening of the V-shaped sealing ring is the largest, and liquid materials are not easy to permeate into gaps between the two adjacent V-shaped sealing rings;

(2) an included angle formed by the inclined plane 314 and a symmetrical axis of the section of the V-shaped sealing ring is 100 degrees, an included angle formed by the inclined plane 314 and the outer sealing surface or the inner sealing surface on the same side is 108 degrees, the scraping sharp angle exceeds the inner sealing surface, a gap is reserved between the inner sealing surface and the piston rod, the scraping sharp angle scrapes materials in the up-and-down moving process of the piston rod, the inner sealing surface is not in close contact with the piston rod, and the abrasion of a crystal to the V-shaped sealing ring is reduced;

(3) in the moving process of the piston rod, crystals scraped by the scraping sharp corner are stored in the annular groove, and the abrasion of the crystals to the V-shaped sealing ring is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a portion of a pumping tube of a plunger pump according to an embodiment;

FIG. 2 is a cross-sectional view of a V-shaped seal ring;

FIG. 3 is a cross-sectional view of the end of the V-shaped seal ring;

description of reference numerals: the device comprises a piston rod-1, a pumping pipe-2, a support ring-3, a V-shaped seal ring-31, an inner seal surface-311, an outer seal surface-312, a scraping sharp angle-313, an inclined surface-314, an annular groove-315 and a valve seat-4.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention can be more clearly and clearly defined.

Referring to the description as shown in figures 1 to 3,

a support ring 3 is respectively arranged between the upper part of a piston rod 1 and a pumping pipe 2 and between a valve seat 4 at the bottom of the piston rod and the pumping pipe, the support ring 3 is overlapped and sleeved by a plurality of V-shaped seal rings 31, an inner seal angle formed by two inner surfaces of the V-shaped seal rings 31 is 80 degrees, an outer seal angle formed by two outer surfaces of the V-shaped seal rings 31 is 90 degrees, the cylinder wall of the pumping cylinder extrudes the uppermost V-shaped seal ring and the lowermost V-shaped seal ring, the upper V-shaped seal ring extrudes the lower V-shaped seal ring, the extrusion force on the upper part of the opening of the V-shaped seal ring is the largest, and liquid materials are not easy to permeate into gaps of the two adjacent V-; the inclined planes inclined downwards at the tops of the inner sealing surface 311 and the outer sealing surface 312 of the V-shaped sealing ring and the inner sealing surfaces and the outer sealing surfaces on two sides respectively form a scraping sharp angle 313, an included angle formed by the inclined plane 314 and the symmetrical axis of the section of the V-shaped sealing ring is 100 degrees, an included angle formed by the inclined plane 314 and the outer sealing surface on the same side or the inner sealing surface is 108 degrees, the scraping sharp angle exceeds the inner sealing surface, a gap is reserved between the inner sealing surface and the piston rod, the scraping sharp angle scrapes materials in the up-and-down moving process of the piston rod, the inner sealing surface is not in close contact with the piston rod; the inner sealing surface 311 and the outer sealing surface 312 are respectively provided with an annular groove 315, the end surface of the annular groove 315 is semicircular, and crystals scraped by the scraping sharp corner are stored in the annular groove in the moving process of the piston rod, so that the abrasion of the crystals to the V-shaped sealing ring is reduced.

The opening of the V-shaped sealing ring of the supporting ring between the upper part of the piston rod 1 and the pumping pipe 2 faces downwards, and the opening of the V-shaped sealing ring of the supporting ring between the valve seat 4 at the bottom of the piston rod and the pumping pipe 2 faces upwards.

The V-shaped sealing ring is made of polytetrafluoroethylene or polyethylene. Good chemical corrosion resistance, high temperature resistance and high wear resistance, and prolongs the service life of the V-shaped sealing ring.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only preferred embodiments of the present invention, and the present invention is not limited by the above preferred embodiments, and various changes and modifications can be made without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the present invention as claimed.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A combined sealing assembly of a plunger pump is characterized in that a supporting ring (3) is respectively arranged between the upper part of a piston rod (1) and a pumping pipe (2) and between a valve seat (4) at the bottom of the piston rod and the pumping pipe, the supporting ring (3) is overlapped and sleeved together by a plurality of V-shaped sealing rings (31), an inner sealing angle formed by two inner surfaces of the V-shaped sealing rings (31) is 80 degrees, an outer sealing angle formed by two outer surfaces of the V-shaped sealing rings (31) is 90 degrees, a bevel surface inclined downwards at the tops of an inner sealing surface (311) and an outer sealing surface (312) of the V-shaped sealing rings and inner and outer sealing surfaces at two sides respectively form scraping sharp corners (313), an included angle formed by the bevel surface (314) and a symmetrical axis of the sections of the V-shaped sealing rings is 100 degrees, an included angle formed by the bevel surface (314) and the outer sealing surface or the inner sealing surface at the same side, the end surface of the annular groove (315) is semicircular.

2. The combined seal assembly of the plunger pump according to claim 1, characterized in that the opening of the V-shaped seal ring of the support ring between the upper part of the piston rod (1) and the pumping pipe (2) faces downwards, and the opening of the V-shaped seal ring of the support ring between the valve seat (4) at the bottom of the piston rod and the pumping pipe (2) faces upwards.