CN203431295U

CN203431295U - Valve rod sealing structure

Info

Publication number: CN203431295U
Application number: CN201320475680.3U
Authority: CN
Inventors: 张逸芳; 龚燕华; 周宏韬; 周丹凤
Original assignee: Jiangsu Shentong Valve Co Ltd
Current assignee: Jiangsu Shentong Valve Co Ltd
Priority date: 2013-08-06
Filing date: 2013-08-06
Publication date: 2014-02-12
Anticipated expiration: 2023-08-06

Abstract

The utility model provides a valve rod sealing structure. The valve rod sealing structure comprises a valve body and a valve rod extending into the valve body; a shaft bush, a sealing padding and a padding gland are sequentially sleeved on the valve rod; the sealing padding is of a reversed dual-V-shaped structure. The valve rod sealing structure has the beneficial effects that 1, the reversed dual-V-shaped padding can realize the bidirectional self-force sealing; 2, action forces of the padding gland and the medium in the valve to the reversed dual-V-shaped padding are concentrated on the middle solid part of the reversed dual-V-shaped padding, the rigidity is good, abrasion difficultly occurs, the action is reliable and the service life is long; 3, for the reversed dual-V-shaped padding, only one part is needed for replacing the traditional multi-piece combined structure, and the reliability is high; 4, the padding can be designed into an internally arranged mode as the reversed dual-V-shaped padding can realize the bidirectional self-force sealing, the space is small, the structure is compact and the valve rod sealing structure is convenient to repair and maintain.

Description

A kind of valve rod leak-proof structure

Affiliated technical field

The utility model relates to technical field of sealing technology, and particularly the self-powering type realized of valve seals and seal reliable novel sealing structure.

Background technique

At present, most valve adopts packing seal to prevent from leaking outside, in prior art, conventionally adopt unidirectional V-type filler, under the effect of this filler pressure medium in valve, open on the lip limit of filler outer ring, all the time be close to valve rod and stuffing box and form self-powering type sealing, after long-play, the lip limit of unidirectional V-type filler is fragile, causes the leakage at valve rod place; And when in valve, pressure medium is low, unidirectional V-type filler is only subject to the one-way compression of top Gland, make the stressed large of top filler, seal pressure is high, and bottom filler is stressed little, occur the inhomogeneous situation of seal pressure, unidirectional V-type filler can not be realized self-powering type sealing in this case, easily causes valve rod place to be leaked; Particularly, under the operating mode of pressure alternation (positive and negative pressure), can not cut off external environment condition.

Summary of the invention

In order to overcome existing valve rod leak-proof structure, adopt unidirectional V-type filler rapid wear, and can not realize the shortcoming of two-way self-powering type sealing, the utility model provides a kind of valve rod leak-proof structure that adopts reverse double V-shaped filler.

The utility model solves the technological scheme that its technical problem adopts, and a kind of valve rod leak-proof structure, comprises valve body, stretches into the valve rod in valve body, is set with successively axle sleeve, stuffing box packing and Gland on valve rod, and described stuffing box packing is reverse double V-shaped structure.

Stuffing box packing section adopts nonmetallic material, as: rubber, plastics etc.; Also can adopt the metallic material that Young's modulus is higher, to be applicable to High Temperature High Pressure occasion.

The beneficial effects of the utility model are:

1, reverse double V-shaped filler can be realized two-way self-powering type sealing;

2, in Gland and valve medium to the force localization of reverse double V-shaped filler the intermediate entities part at reverse double V-shaped filler, good rigidity, not easy to wear, reliable effect and long service life;

3, reverse double V-shaped filler only need adopt a part to substitute many traditional composite structures, simple structure, high reliability, and cost-saving;

4,, because reverse double V-shaped filler can be realized the sealing of two-way self-powering type, therefore that filler can be designed to is built-in, space is little, compact structure, and installation and maintenance are convenient.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the utility model is further illustrated.

Fig. 1 is embodiment's tectonic maps.

In figure: 1. valve rod; 2. Gland; 3. stuffing box packing; 4. valve body; 5. axle sleeve.

Embodiment

As shown in Figure 1, a kind of valve rod leak-proof structure, comprises valve body 4, stretches into the valve rod 1 in valve body 4, on valve rod 1, be set with successively axle sleeve 5, stuffing box packing 3 and Gland 2, described stuffing box packing 3 can adopt nonmetallic material for reverse double V-shaped structure ，Liao section, as: rubber, plastics etc.; Also can adopt the metallic material that Young's modulus is higher, to be applicable to High Temperature High Pressure occasion.

Claims

1. a valve rod leak-proof structure, comprises valve body, stretches into the valve rod in valve body, is set with successively axle sleeve, stuffing box packing and Gland on valve rod, it is characterized in that: described stuffing box packing is reverse double V-shaped structure.