CN208221028U - The sealing device of air-compressor piston head - Google Patents

Abstract

The utility model discloses a kind of sealing device of air-compressor piston head, includes piston only, piston push rod, elastic external member, and piston only, which includes cover board and successively folds, sets elastic soft board on the cover board, push plate；The end of piston push rod is fixedly connected with push plate far from the plate face of elastic soft board；Elastic external member is in bottle cap shape, and elastic external member wraps up cover board and elastic soft board, the inner sidewall of elastic external member open end are fixed on the perimeter side walls of push plate；Perimeter side walls, the perimeter side walls of cover board of elastic soft board support conjunction on the inner sidewall of elastic external member.Compared with prior art, the service life of piston head seal member can be improved in the utility model, can also obtain preferable sealing performance.

Description

The sealing device of air-compressor piston head

Technical field

The utility model relates to a kind of sealing of Parts of Compressor field more particularly to air-compressor piston head dresses It sets.

Background technique

Leakproofness between piston head and cylinder body is current piston an important factor for influencing air compressor working performance Generally flexible sealing ring is arranged by the side in piston head to increase the leakproofness of piston head, sealing ring and cylinder body in head If gap between is excessive, influences sealing performance, if gap is too small, will lead to the mobile difficulty of piston head, increases energy Consumption, while also will increase the resistance that sealing ring is subject to, reduce the service life of sealing ring.

Utility model content

The utility model is to solve existing technological deficiency, provides a kind of sealing device of air-compressor piston head, Its service life that piston head seal member can be improved can also obtain preferable sealing performance.Its specific technical solution It is as follows:

The utility model discloses a kind of sealing device of air-compressor piston head, include piston only, piston push rod, Elastic external member, piston only include cover board and successively fold and set elastic soft board on the cover board, push plate；The end of piston push rod It is fixedly connected with push plate far from the plate face of elastic soft board；Elastic external member be in sealed bottom tubular, elastic external member wrap up cover board and The inner sidewall of elastic soft board, elastic external member open end is fixed on the perimeter side walls of push plate；The perimeter side walls of elastic soft board, cover board Perimeter side walls support conjunction on the inner sidewall of elastic external member.

Further, push plate has the seal groove opened up around own periphery side wall；Push plate is separated into upper plate by seal groove Section, lower plate section, the planform of lower plate section is identical as the planform of upper plate section, and the size of lower plate section is less than the ruler of upper plate section It is very little；The side wall of elastic external member open end up extends along the perimeter side walls of lower plate section, and bends toward seal groove, and be fixed on close The inner sidewall of sealing groove；The perimeter side walls of elastic external member are flushed with the perimeter side walls of upper plate section.

Further, push plate, cover board are fixedly connected with elastic soft board.

Further, the side that cover board closes on elastic soft board is fixed with the guide rod of end expansion, and guide rod is perpendicular to elasticity Soft board；The side that push plate closes on elastic soft board offers guide hole compatible with the guide rod end, and bullet is run through in the end of guide rod Property soft board, extend in guide hole, guide rod and guide hole activity cooperate.

Further, push plate closes on the side evagination of elastic soft board into arc surfaced, and cover board closes in the side of elastic soft board It is recessed into arc surfaced, arcwall face of the shape of elastic soft board two sides respectively with the arcwall face of push plate evagination, cover board indent matches.

The utility model has the beneficial effects that piston head is in the Forward stroke of compressed gas, push plate is pushed away by from piston The thrust of bar, while cover board is from by the propulsive thrust of compressed gas, therefore cover board and push plate simultaneously squeeze elastic soft board, make bullet Property soft board toward being radially expanded deformation, and then elastic external member is forced to deform, the outside of elastic external member applies pressure to cylinder side wall, increasing Add the leakproofness between piston head and cylinder body；For piston head in the return of return, piston push rod does not apply thrust to push plate, because This, push plate, which does not apply elastic soft board actively, squeezes thrust, and the extruding force that elastic soft board is subject to becomes smaller, the radial shape of elastic soft board Change becomes smaller, and then the pressure applied on the outside of elastic external member to cylinder side wall is made to become smaller or disappear, elastic external member and cylinder side wall Frictional force become smaller, carry out reduce elastic external member fatigue wear amount, improve the service life of the seal member of piston head.

Detailed description of the invention

Fig. 1 is the overall structure diagram of the utility model embodiment.

It is marked in figure: push plate 100, upper plate section 101, seal groove 102, lower plate section 103, guide hole 104, piston push rod 200, bullet Property soft board 300, cover board 400, guide rod 401, elastic external member 500.

Specific embodiment

The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng The embodiment for examining attached drawing description is exemplary, it is intended to for explaining the utility model, and should not be understood as to the utility model Limitation.

The utility model is described in further detail below by specific embodiment combination attached drawing.Please refer to attached drawing.

The utility model discloses a kind of sealing device of air-compressor piston head, include columned piston only, Piston push rod 200, elastic external member 500, piston only includes cover board 400 and successively the folded elasticity being located on cover board 400 is soft Plate 300, push plate 100；Elastic external member 500 can be made of polytetrafluoroethylene (PTFE) material or rubber material, and elastic soft board 300 can be with It is made of polytetrafluoroethylene (PTFE) material or rubber material, the end of piston push rod 200 and push plate 100 are far from elastic soft board 300 Plate face be fixedly connected, piston push rod 200 can be integrally formed with push plate 100；Elastic external member 500 is in the tubular of sealed bottom, It specifically, is in bottle cap shape, elastic external member 500 wraps up cover board 400 and elastic soft board 300, the inner sidewall of 500 open end of elastic external member The perimeter side walls of push plate 100 are fixed on, specifically, elastic external member 500 can be bonded in push plate 100, then pass through screw handle Elastic external member 500 is fixed in push plate 100, is sunk in the ailhead of screw into the surface of elastic external member 500；The week of elastic soft board 300 Edge side wall, cover board 400 perimeter side walls support conjunction on the inner sidewall of elastic external member 500, specifically, elastic soft board 300, cover board 400 movably cooperate with elastic external member 500.When work, piston head in the Forward stroke of compressed gas, push plate 100 by To the thrust from piston push rod 200, while cover board 400 is from by the propulsive thrust of compressed gas, therefore cover board 400 and push plate 100 simultaneously squeeze elastic soft board 300, make elastic soft board 300 is past to be radially expanded deformation, and then elastic external member 500 is forced to deform, The outside of elastic external member 500 applies pressure to cylinder side wall, increases the leakproofness between piston head and cylinder body；Piston head is moving back Return in, piston push rod 200 does not apply thrust to push plate 100, and therefore, push plate 100 actively applies crowded not to elastic soft board 300 Thrust is pressed, the extruding force that elastic soft board 300 is subject to becomes smaller, and the radial deformation of elastic soft board 300 becomes smaller, and then makes elastic external member 500 outsides become smaller or disappear to the pressure that cylinder side wall applies, and elastic external member 500 and the frictional force of cylinder side wall become smaller, into Row reduces the fatigue wear amount of elastic external member 500, improves the service life of the seal member of piston head.

Further, push plate 100 has the seal groove 102 opened up around own periphery side wall, and seal groove 102 can be improved The air-tightness of piston head；Push plate 100 is separated into upper plate section 101, lower plate section 103, the structure shape of lower plate section 103 by seal groove 102 Shape is identical as the planform of upper plate section 101, and the size of lower plate section 103 is less than the size of upper plate section 101；Elastic external member 500 is opened The side wall at mouth end up extends along the perimeter side walls of lower plate section 103, and bends toward seal groove 102, is held in seal groove 102 It is interior, the inner sidewall of seal groove 102 is then fixed on by screw or glue, elastic external member 500 and 100 knot of push plate can be improved in this The compactness of conjunction.The side-wall outer side of elastic external member 500 is flushed with the perimeter side walls of upper plate section 101.

Further, push plate 100, cover board 400 are fixedly connected with elastic soft board 300, when this can prevent pistons work, Radial displacement occurs between elastic 300 three of soft board for push plate 100, cover board 400.Preferably, three is adhesively fixed by glue.

Further, the side that cover board 400 closes on elastic soft board 300 is fixed with the guide rod 401 of end expansion, guide rod 401 perpendicular to elastic soft board 300；The side that push plate 100 closes on elastic soft board 300 offers compatible with 401 end of guide rod Guide hole 104, the end of guide rod 401 is run through elastic soft board 300, is extended in guide hole 104, between guide rod 401 and elastic soft board 300 Activity cooperation, guide rod 401 and 104 activity of guide hole cooperate, and by the cooperation of guide rod 401 and guide hole 104, push plate 100 can be made right The direction of extrusion of elastic soft board 300 is parallel with 400 pairs of the cover board elastic directions of extrusion of soft board 300, improves 300 stress of elastic soft board The uniformity.

Further, push plate 100 closes on the side evagination of elastic soft board 300 into arc surfaced, and cover board 400 closes on elastic soft board It is recessed into arc surfaced in 300 side, the shape of elastic 300 two sides of soft board arcwall face, the cover board with 100 evagination of push plate respectively The arcwall face of 400 indents matches, in pistons work, can prevent cover board 400, elastic soft board 300,100 three of push plate it Between shift, improve the uniformity of elastic 300 stress of soft board.

The above content is combine specific embodiment further detailed description of the utility model, and it cannot be said that The specific implementation of the utility model is only limited to these instructions.For the utility model person of an ordinary skill in the technical field For, without departing from the concept of the premise utility, a number of simple deductions or replacements can also be made.

Claims (5)

1. a kind of sealing device of air-compressor piston head includes piston only, piston push rod (200), elastic external member (500), the piston only includes cover board (400) and successively folds the elastic soft board that is located on the cover board (400) (300), push plate (100)；The end and the push plate (100) of the piston push rod (200) are far from the elastic soft board (300) Plate face is fixedly connected；The elastic external member (500) is in the tubular of sealed bottom, and the elastic external member (500) wraps up the cover board (400) and the elastic soft board (300), the inner sidewall of elastic external member (500) open end are fixed on the push plate (100) Perimeter side walls；The periphery of the elasticity soft board (300), the periphery of the cover board (400) support conjunction in the elastic external member (500) Inner sidewall on.

2. sealing device as described in claim 1, which is characterized in that the push plate (100) has around own periphery side wall The seal groove (102) opened up；The push plate (100) is separated into upper plate section (101), lower plate section by the seal groove (102) (103), the planform of the lower plate section (103) is identical as the planform of the upper plate section (101), the lower plate section (103) size is less than the size of the upper plate section (101)；The side wall of elastic external member (500) open end is along under described The perimeter side walls of plate section (103) up extend, and bend toward the seal groove (102), and be fixed on the seal groove (102) Inner sidewall；The side-wall outer side of the elastic external member (500) is flushed with the perimeter side walls of the upper plate section (101).

3. sealing device as described in claim 1, which is characterized in that the push plate (100), the cover board (400) are and institute Elastic soft board (300) is stated to be fixedly connected.

4. sealing device as claimed in claim 3, which is characterized in that the cover board (400) closes on the elastic soft board (300) Side be fixed with the guide rod (401) of end expansion, the guide rod (401) is perpendicular to the elastic soft board (300)；It is described to push away The side that plate (100) closes on the elastic soft board (300) offers guide hole (104) compatible with the guide rod (401) end, The end of the guide rod (401) is run through the elastic soft board (300), is extended in the guide hole (104), the guide rod (401) Cooperate with the guide hole (104) activity.

5. sealing device as described in claim 1, which is characterized in that the push plate (100) closes on the elastic soft board (300) Side evagination at arc surfaced, the cover board (400), which is closed in the side of the elastic soft board (300), is recessed into arc surfaced, described The shapes of elastic soft board (300) two sides respectively with the arcwall face of the push plate (100) evagination, the cover board (400) indent Arcwall face matches.