CN1200205C - Pressure reducing sealing shaft sealing device for reciprocating pump - Google Patents

Abstract

The invention relates to a decompression sealing shaft sealing device for reciprocating pumps, which comprises an inner sealing ring, an outer sealing ring, a decompressor and a residual pressure reflux valve, wherein the inner sealing ring and the outer sealing ring have the same structure, are respectively arranged in cylindrical holes at two ends of an outer shaft sleeve and are together arranged at the outer side of a filler culvert of a pump body; the pressure reducer is an assembly consisting of a film, a framework and a pressing ring and is integrally arranged in the middle of the filler culvert, namely between the inner shaft sleeve and the outer shaft sleeve; the structure of the residual pressure return valve is a solid spherical body, the right side of the residual pressure return valve is arranged in the inner shaft sleeve, the valve hole is communicated with the flow channel on the left side, and the residual pressure return valve is integrally arranged on the inner side of the filler culvert. The invention has the advantages that: the plunger pump is convenient for serialization and standardization design, and can be matched with plunger pump manufacturers for use; the on-site installation is simple, convenient and quick, and is suitable for on-site shaft seal modification of the pump; long continuous running period, high safety and reliability and no leakage.

Description

Reciprocating pump reduced pressure sealing gland seal device

Technical field

The present invention relates to a kind of gland seal device that is used for the reciprocating pump class, be meant a kind of reduced pressure sealing gland seal device of reciprocating pump class especially.

Background technique

At present, the axle sealing structure that reciprocating pump (claim again: plunger pump down together) uses, the overwhelming majority is packing seal, because the pressure of plunger pump medium is higher, exists plunger axis (be called for short: axle down together) the surface abrasion problem that serious shaft sealing leakage problem and filler filling technique reason cause.

Summary of the invention

In view of above reason, the objective of the invention is in order to provide a kind of good seal performance not damage the reduced pressure sealing gland seal device on axle surface.

The objective of the invention is to be achieved through the following technical solutions, it comprises makes medium the outer foreign matter of the inner seal ring of external leakage (14) and pump and air does not enter outer seal ring (17) in the pump, the decompressor (10) that reduces pressure medium in the axle envelope and the overbottom pressure reflux valve (6) of the interior remaining pressure medium of discharge axis envelope are arranged, inner seal ring (14) is identical with the structure of outer seal ring (17), place respectively in the cylindrical hole at external axle sleeve (13) two ends, together place the outside of the filler culvert of the pump housing (4); Decompressor (10) is skeleton membrane structure, constitutes an assembly parts by film (9), skeleton (3), trim ring (7), (12), and the neutral position that integral body places filler to contain is promptly between internal axle sleeve (5) and the external axle sleeve (13); The structure of overbottom pressure reflux valve (6) is solid ball-type body, places the right side of internal axle sleeve (5), and valve opening is communicated with the runner (2) in left side, the inboard (medium one side) that integral body places filler to contain.

The present invention is enclosed within on the plunger axis (1), together places the filler that forms between the pump housing (4) and the plunger axis to contain, and by former ring-like nut (16) with its firm being pressed in the space that filler contains.

Inner seal ring (14) and outer seal ring (17) employing standard or non-standard seal ring, the structure shape of seal ring comprise U type ring, V-type ring, L type ring and various special-shaped seal ring; Seal ring (14), (17) structure of adopting are identical, place the cylindrical hole at external axle sleeve (13) two ends respectively, the corresponding coupling of outside diameter of ring with this hole, and certain pretightening force (self-tightening power) arranged, the endoporus of ring has bigger gap with axle (1), and the lip of ring directly touches and less pretightening force (self-tightening power) arranged with being coupling.

Decompressor (10) constitutes an assembly parts by film (9), skeleton (3), trim ring (7), (12), the structure of film (9) is the thin-walled hollow cylinder type, its two ends extend radially outward respectively and form an annulus (91), (92), be respectively equipped with on the radial outside end face of annulus vertically and extend, with the ring-like boss of described annulus all-in-one-piece (93), (94), (95), (96), film (9) is made by elastic material, can adopt nonmetal or metallic film material such as rubber, elastomeric plastics to make, have higher elasticity; The structure of skeleton (3) is an inner ring type step type open circles column type, its madial wall is provided with ring shaped step (31), (32) and structure identical, be respectively equipped with ring groove on the axial outer end face of two steps, ring-like boss (94) on the film (9), (95) the corresponding respectively ring shaped step (31) that places in the skeleton (3), (32) in the ring groove of exterior edge face, by trim ring (7), (12) respectively the annulus at described film two ends is pressed on the outside of ring shaped step from two ends, ring-like boss (93) on the film, (96) the corresponding respectively simultaneously trim ring (7) that places, (12) in the groove, constituting the sealed mode space between film (9) and the skeleton (3) is chamber (11) (air pressure in the chamber equals atmospheric pressure); This decompressor (10) is enclosed within axle (1) and goes up and together place filler to contain, and constitutes chamber (8) between axle (1) and film (9), internal axle sleeve (5), the inner seal ring (14).

The structure of overbottom pressure reflux valve (6) is solid ball-type body, and valve seat is located in the internal axle sleeve (5), and with runner (2) UNICOM, its effect is by this valve the remaining pressure medium in the chamber (8) to be discharged in the pump, realizes reducing the pressure in the axle envelope.

This reduced pressure sealing gland seal device good seal performance, be applied in the reciprocating plunger pump, because the gap (18) very little (about 0.05～0.1 millimeter) that forms between internal axle sleeve (5) and the axle (1), the pressure medium in the pump housing (4) through the water yield of this clearance leakage also seldom.When axle is made compression movement, pressure in the pump housing raises gradually, and overbottom pressure reflux valve (6) cuts out under its pressure effect, and see through the medium (water) that leaks in gap (18) and enter into chamber (8) this moment, and it being sealed not external leakage by inner seal ring (14), this cavity indoor pressure raises.Film (9) pressurized resiliently deformable is also done the radial expansion motion, and chamber (8) volume increases, and chamber (11) volume reduces, and air wherein is compressed, and the interior pressure of two chambers this moment equates, slightly equals the elastic strength of film (9), realizes decompression; When axle is done suction (medium) motion, the pressure of medium slightly is in vacuum state in the pump, overbottom pressure reflux valve this moment (6) is opened, medium in the chamber (8) is drawn in the pump, pressure disappears in this chamber, under the effect of air pressure in chamber (11) and film self elastic force, film (9) returns to reset condition; Axle (1) so to-and-fro motion, decompression film (9) are expanded thereupon, are shunk and realize decompression realizing sealing.On-stream, there is not the direct mechanical fricting movement substantially between film (9) and the axle (1), the frequency of expansion, contractile motion is lower, and the elastic material of employing is better again, long service life; Inner seal ring (14) and outer seal ring (17) directly touch friction with being coupling, and realize sealing.Because the pressure in axle (1) reciprocating linear velocity lower (about 0.4 meter per second) and the chamber (8) is lower and oil storage tank (15) has grease to be lubricated again, and is minimum to the wearing and tearing of seal ring, so working life is longer equally.This envelope does not have maintenance load in using, and life cycle operates as above nothing leakage half a year continuously.

Advantage of the present invention is:

1, is convenient to seriation, Normalized Design, can be the supporting use of plunger pump manufacturing firm.

2, on-the-spot simple installation, quick is applicable to and is using the on-the-spot retrofit of axial seal of pump.

3, cycle of oparation is long, and the safety reliability height does not have and leaks.

Description of drawings

Fig. 1 is the reciprocating pump reduced pressure sealing gland seal device structural representation

Fig. 2 is the membrane structure schematic representation

Fig. 3 is a decompressor dynamic structure schematic representation

Embodiment

Referring to Fig. 1, in the described reciprocating pump reduced pressure sealing gland seal device of present embodiment, inner seal ring (14) is identical with the structure of outer seal ring (17), places respectively in the cylindrical hole at external axle sleeve (13) two ends, together places the outside of the filler culvert of the pump housing (4); Decompressor (10) is skeleton membrane structure, constitutes an assembly parts by film (9), skeleton (3), trim ring (7), (12), the neutral position that integral body places filler to contain; The structure of overbottom pressure reflux valve (6) is solid ball-type body, places the right side of internal axle sleeve (5), and valve opening is communicated with the runner (2) in left side, the inboard that integral body places filler to contain.

The present invention is enclosed within on the plunger axis (1), together places the filler that forms between the pump housing (4) and the plunger axis to contain, and by former ring-like nut (16) with its firm being pressed in the space that filler contains.

Inner seal ring (14) is identical with outer seal ring (17) structure, adopts 2 standard U type seal rings, places the cylindrical hole at external axle sleeve (13) two ends respectively, the outside diameter of ring and corresponding hole coupling, and have pretightening force to prevent to become flexible; The endoporus of ring has bigger gap with axle (1), and the lip of ring directly touches and less pretightening force arranged with being coupling.The lip of inner seal ring (14) is towards medium one side, the medium in the canned pump; The lip of outer seal ring (17) is towards " atmospheric pressure " side, air and foreign matter that canned pump is outer.

Referring to Fig. 2, the structure of film (9) is the thin-walled hollow cylinder type, its two ends are respectively equipped with annulus (91), (92), be respectively equipped with ring-like boss (93), (94), (95), (96) on the end face of annulus both sides and make one, two annulus (91), (92) structure are identical, and 4 ring-like boss structures of annulus both sides are also identical, are the R type, film (9) adopts rubber material to make, and has higher elasticity.

Referring to Fig. 3, decompressor (10) constitutes an assembly parts by film (9), skeleton (3), trim ring (7), (12), the structure of skeleton (3) is an inner ring type step type open circles column type, the filler of the outside diameter and the pump housing (4) is contained the corresponding coupling in aperture, ring shaped step (31), (32) structure in it are identical, place the hole at cylindrical body two ends respectively and make one, adopt metal or nonmetallic material to make; Be respectively equipped with concave groove on the exterior edge face of two steps (31), (32).Film (9) places skeleton (3), annulus on the film (91), (92) respectively with skeleton in the exterior edge face of step (31), (32) fit, ring-like boss (94), (95) place corresponding ring groove respectively, by trim ring (7), (12) respectively with its firm being locked on the skeleton, ring-like boss (93), (96) are corresponding respectively simultaneously to be placed in the groove of trim ring (7), (12), and constituting the sealed mode space is chamber (11); This decompressor is enclosed within axle (1) and goes up and together place filler to contain, and constitutes chamber (8) between axle (1) and film (9), internal axle sleeve (5), the inner seal ring (14).

Referring to Fig. 1, the structure of overbottom pressure reflux valve (6) is solid ball-type body, and valve seat is located in the internal axle sleeve (5), and is communicated with runner (2), and its effect is by this valve the remaining pressure medium in the chamber (8) to be discharged in the pump, realizes reducing the interior pressure of axle envelope.

The endoporus middle part of external axle sleeve (13), oil storage tank (15) is arranged, and the lubricating grease in its groove directly contacts with plunger axis (1), and axial plane, external axle sleeve, seal ring (14), (17) are lubricated, can carry out regular oiling by priming cup, realize the life cycle that the axle surface is injury-free and prolong axle.

Claims (3)

1, a kind of reciprocating pump reduced pressure sealing gland seal device, it is characterized in that it comprises makes medium the outer foreign matter of the inner seal ring of external leakage (14) and pump and air does not enter outer seal ring (17) in the pump, the decompressor (10) that reduces pressure medium in the axle envelope and the overbottom pressure reflux valve (6) of the interior remaining pressure medium of discharge axis envelope are arranged, inner seal ring (14) is identical with the structure of outer seal ring (17), place respectively in the cylindrical hole at external axle sleeve (13) two ends, together place the outside of the filler culvert of the pump housing (4); Decompressor (10) is skeleton membrane structure, constitutes an assembly parts by film (9), skeleton (3), trim ring (7), (12), and the neutral position that integral body places filler to contain is promptly between internal axle sleeve (5) and the external axle sleeve (13); The structure of overbottom pressure reflux valve (6) is solid ball-type body, places the right side of internal axle sleeve (5), and valve opening is communicated with the runner (2) in left side, the inboard that integral body places filler to contain; The structure of film (9) is the thin-walled hollow cylinder type, its two ends extend radially outward respectively and form an annulus (91), (92), be respectively equipped with on the radial outside end face of annulus vertically extend, with the ring-like boss of described annulus all-in-one-piece (93), (94), (95), (96), film (9) is made by elastic material; The structure of skeleton (3) is an inner ring type step type open circles column type, and it is identical that its madial wall is provided with ring shaped step (31), (32) and structure, is respectively equipped with ring groove on the axial outer end face of two steps; Ring-like boss (94) on the film (9), (95) be corresponding respectively to be placed in the ring groove of ring shaped step (31) in the skeleton (3), (32) exterior edge face, respectively the annulus at described film two ends is pressed on the outside of ring shaped step from two ends by trim ring (7), (12), constituting the sealed mode space between film (9) and the skeleton (3) is chamber (11); Decompressor (10) is enclosed within on the axle (1), constitutes chamber (8) between axle (1) and film (9), internal axle sleeve (5), the inner seal ring (14).

2, reduced pressure sealing gland seal device as claimed in claim 1, the structure shape that it is characterized in that inner seal ring (14) and outer seal ring (17) are U type ring, V-type ring or L type ring.

3, reduced pressure sealing gland seal device as claimed in claim 1 is characterized in that film (9) adopts rubber, elastomeric plastics or metallic film material to make.

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