CN200943761Y

CN200943761Y - Valve rod sealing structure

Info

Publication number: CN200943761Y
Application number: CN 200620133120
Authority: CN
Inventors: 钱成龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-08-30
Filing date: 2006-08-30
Publication date: 2007-09-05
Anticipated expiration: 2016-08-30

Abstract

The utility model discloses a new type valve stem sealing structure, which comprises a valve cap, a valve stem, a valve stem screw nut, fillers and a filler gland, wherein the inner wall of the valve cap is provided with a ring convex margin; the outer circumferential surface of lower end of the valve stem has a retaining convex margin; the fillers are loaded by the filler gland between the valve cap and the valve stem above the ring convex margin; between the valve stem below the ring convex margin and the valve cap a sealing element is provided, the sealing element is compressed and sealed by the retaining convex margin of the valve stem. Having the advantages of rational structure and reliable sealing performance etc., the sealing structure can eliminate the permeating or flushing leakage problems occurred to the valve stem and lengthen the service life of the valve stem.

Description

A kind of novel valve rod leak-proof structure

Technical field

The utility model relates to a kind of sealing configuration, more precisely a kind of sealing configuration of valve rod.

Background technique

Existing all kinds of valve, its working principle all is the handwheel of rotating valve, make valve rod drive the unlatching that the lock core in the valve comes control valve, close, valve stem seal generally all is that filler is set around valve rod, this filler is compressed by Packing seat and follower, realize the sealing between valve rod and the valve gap, in use, the rotation of valve rod can make filler produce wearing and tearing, thereby seepage appears, towards the leakage problem, had a strong impact on the normal use of valve, this Chinese patent CN200420107746.4 is just disclosed a kind of " valve rod leak-proof structure ", it is with locking lid on Stem Mut, be provided with reed between Stem Mut and Gland, can guarantee that Stem Mut can not be subjected to external force collision and becomes flexible, and after the filler wearing and tearing, still have enough impacting forces to guarantee sealing, owing to only depend on filler to seal, so filler still failure phenomenon can occur after wearing and tearing after a while, and working life is shorter.

The model utility content

At the deficiency that prior art exists, the purpose of this utility model is to provide a kind of rational in infrastructure, reliable novel valve rod leak-proof structure of sealability.The sealing structure can stop seepage that the valve rod position occurs, towards the leakage problem, prolong the working life of valve,

For achieving the above object, the technical solution adopted in the utility model is:

A kind of novel valve rod leak-proof structure, comprise valve gap, valve rod, Stem Mut, filler and Gland, the inwall of valve gap is provided with the convex annular edge, the outer peripheral surface of valve rod lower end is provided with the retaining convex edge, filler is press-fited between the valve rod and valve gap in convex annular along the top by Gland, be provided with Sealing between valve rod below the convex annular edge and valve gap, the sealing part compresses sealing by the retaining convex edge on the valve rod.

Described Sealing comprises upper strata cone-shaped sealing ring, middle compressibility seal ring and the flat thrust seal ring of bottom, its at the middle and upper levels cone-shaped sealing ring have downward conical outer surface, middle compressibility seal ring has cone-shaped inner surface upwards, and both upper and lower sleeves synthesize complete ring packing packing ring.

Described upper strata cone-shaped sealing ring is made by polytetrafluoroethylmaterial material.

Be with locking lid on the described Stem Mut, the center hole of locking lid matches with valve rod, and locking lid passes valve rod and is embedded on the Stem Mut.

The center hole shape of described locking lid is a square.

Be provided with elastic washer between described Stem Mut and the Gland.

Described elastic washer is made up of two butterfly spring sheets up and down.

Stem Mut of the present utility model can compress filler and Sealing when tightening, has double-layer sealing structure up and down, the upper strata cone-shaped sealing ring of Sealing is in the state of compression fully, and at any time all remain static, can not rotate, rotatablely move and occur over just on the flat thrust seal ring of bottom, assurance has best sealing effect, the inner conical surface of middle compressibility seal ring is given power to the valve rod direction of upper strata cone-shaped sealing ring, further guaranteed the sealing of valve rod, the elastic washer of Stem Mut bottom then can wear and tear at filler, variation in pressure, during temperature fluctuation, provide continuous power to adjust automatically, and after a period of time wearing and tearing, Stem Mut can be tightened to required torque again.

Description of drawings

Fig. 1 is a cross-sectional schematic of the present utility model;

Fig. 2 is the A portion enlarged diagram of Fig. 1.

Embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail.

Description of reference numerals is as follows:

1---valve gap 2---valve rod

3---Stem Mut 4---filler

5---Gland 6---convex annular edge

7---retaining convex edge 8---upper strata cone-shaped sealing ring

The flat thrust seal ring of 9---middle compressibility seal ring 10---bottoms

11---locking lid

As Fig. 1, valve rod leak-proof structure shown in Figure 2, mainly by valve gap 1, valve rod 2, Stem Mut 3, filler 4 and Gland 5 are formed, the inwall of valve gap 1 is provided with convex annular along 6, the outer peripheral surface of valve rod lower end is provided with retaining convex edge 7, filler 4 is press-fited between the valve rod and valve gap in convex annular along the top by Gland 5, between valve rod below the convex annular edge and valve gap, be provided with Sealing, the sealing part compresses sealing by the retaining convex edge 7 on the valve rod, be three-decker, be respectively upper strata cone-shaped sealing ring 8 from top to bottom, middle compressibility seal ring 9 and the flat thrust seal ring 10 of bottom, its at the middle and upper levels cone-shaped sealing ring 8 have downward conical outer surface, make by the polytetrafluoroethylene (PTFE) material, middle compressibility seal ring 9 has cone-shaped inner surface upwards, both upper and lower sleeves synthesize complete ring packing packing ring, be with locking lid 11 on the Stem Mut 3, the square of the center hole of locking lid 11 for matching with valve rod 2, locking lid 11 passes valve rod and is embedded on the Stem Mut 3, be provided with two butterfly spring sheets up and down between Stem Mut 3 and the Gland 5, make it have automatic compensation function.

The utility model is not limited to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present invention; no matter but on its shape or structure, do any variation; every have identical with a utility model or akin technological scheme, all within its protection domain.

Claims

1, a kind of novel valve rod leak-proof structure, comprise valve gap, valve rod, Stem Mut, filler and Gland, it is characterized in that, the inwall of described valve gap is provided with the convex annular edge, the outer peripheral surface of valve rod lower end is provided with the retaining convex edge, filler is press-fited between the valve rod and valve gap in convex annular along the top by Gland, convex annular along below valve rod and valve gap between be provided with Sealing, the sealing part compresses sealing by the retaining convex edge on the valve rod.

2, novel valve rod leak-proof structure according to claim 1, it is characterized in that, described Sealing comprises upper strata cone-shaped sealing ring, middle compressibility seal ring and the flat thrust seal ring of bottom, its at the middle and upper levels cone-shaped sealing ring have downward conical outer surface, middle compressibility seal ring has cone-shaped inner surface upwards, and both upper and lower sleeves synthesize complete ring packing packing ring.

3, novel valve rod leak-proof structure according to claim 2 is characterized in that, described upper strata cone-shaped sealing ring is made by polytetrafluoroethylmaterial material.

4, novel valve rod leak-proof structure according to claim 1 is characterized in that, is with locking lid on the described Stem Mut, and the center hole of locking lid matches with valve rod, and locking lid passes valve rod and is embedded on the Stem Mut.

5, novel valve rod leak-proof structure according to claim 4 is characterized in that, the center hole shape of described locking lid is a square.

6, novel valve rod leak-proof structure according to claim 1 is characterized in that, is provided with elastic washer between described Stem Mut and the Gland.

7, novel valve rod leak-proof structure according to claim 6 is characterized in that, described elastic washer is made up of two butterfly spring sheets up and down.