CN2321983Y

CN2321983Y - Butterfly valve capable of preventing sand from entering bearing

Info

Publication number: CN2321983Y
Application number: CN 97251301
Authority: CN
Inventors: 刘普成; 郭志杰; 刘大全; 李效龙; 邹乐陶
Original assignee: CHANGSHA CITY VALVE FACTORY
Current assignee: CHANGSHA CITY VALVE FACTORY
Priority date: 1997-12-19
Filing date: 1997-12-19
Publication date: 1999-06-02
Anticipated expiration: 2007-12-19

Abstract

The utility model relates to a butterfly valve capable of preventing sand from entering bearings. Both ends of a valve axle of the existing butterfly valve are respectively provided with a rolling bearing, a plurality of groups of frame oil seals are arranged on a valve axle between the rolling bearings and the inner cavity of a valve body. The utility model has the advantages of simple structure, accurate axial location, good water sealing and tightening performance, no leakage, small friction moment, flexible and light switch valve, reliable service performance and long service life and is especially suitable for media having much silt.

Description

A kind of silt that prevents enters the butterfly valve of bearing

The utility model is that a kind of silt that prevents enters the butterfly valve of bearing.

In existing butterfly valve, the bearing of supporting valve shaft all is designed to sliding bearing, the structure at its axle journal place is that bearing supports formerly, after being sealed in, because the silt (as Huanghe water) in the pipeline medium can enter bearing with medium along axle, cause wearing and tearing aggravation between axle and bearing, surface friction drag increases, open, closing valve moment and increase, is that 87204543.9 butterfly valve is above-mentioned design as the patent No. of our factory production, and such valve is not suitable for and contains the many media of silt, as Huanghe water, because it is many that Huanghe water contains silt, after silt enters bearing, not only make the friction severity between axle and bearing, What is more, valve is fitted badly, cause and leak or the stuck bearing of silt water, valve can't be opened, close.

The purpose of this utility model is to overcome the deficiency of prior art and provides a kind of simple in structure, and reliable performance can prevent effectively that silt from entering the butterfly valve of bearing.

The utility model is to adopt following proposal to realize: the valve shaft two ends at existing butterfly valve respectively are equipped with rolling bearing, rolling bearing and body cavity can valve shaft on some groups of outside framework oil seals are installed.

Concrete structure of the present utility model describes in detail below in conjunction with accompanying drawing:

Accompanying drawing 1 is the half sectional view of the utility model.

Accompanying drawing 2 is an A portion enlarged view in the accompanying drawing 1.

See accompanying drawing 1,2, the utility model is made up of valve body 1, butterfly plate 2, valve shaft 3, outside framework oil seal 4, rolling bearing 5, positioning block 6, end cap 7, dunnage 8, driving mechanism 9, the structure of described valve body 1, butterfly plate 2, valve shaft 3, positioning block 6, end cap 7, dunnage 8, driving mechanism 9 and installation form all with the patent No. be 87204543.9 just the same, its improvement is that valve shaft 3 two ends all are equipped with rolling bearing 5, on the valve shaft 3 between rolling bearing 5 and valve body 1 inner chamber some groups of outside framework oil seals 4 is housed.

Working principle of the present utility model is sketched in following: the utility model is owing to be equipped with some groups of outside framework oil seals 4 between rolling bearing on the valve shaft 35 and valve body 1 inner chamber, adopt sealing earlier, the structure of back supporting, thereby, make the silt that contains in liquid medium in the valve body 1 of flowing through and the liquid medium etc. all can not enter in the rolling bearing 5, thereby prevented the generation of silt and liquid medium, guaranteed the reliability of butterfly valve work effectively the burn into stuck phenomenon of rolling bearing; Simultaneously, owing to adopt sealing earlier, the structure of back supporting, it is stuck to have prevented that solid dielectric such as silt from producing bearing, makes rolling bearing can be applied to do in the butterfly valve block bearing, because the friction factor of rolling bearing is far smaller than sliding bearing, therefore, starting torque is little during the open and close valve, and is light and handy flexibly, sealing is reliable, does not have to leak.

In sum, the utility model is simple and reasonable, and axially locating is accurate, and valve water shutoff leakproofness is good, does not have to leak, and friction torque is little, and switch valve is flexible, light and handy, and usability is reliable, and the life-span is long, is specially adapted to contain in the many media of silt and uses.

Claims

A kind of silt that prevents enters the butterfly valve of bearing, comprise valve body 1, butterfly plate 2, valve shaft 3, outside framework oil seal 4, rolling bearing 5, positioning block 6, end cap 7, dunnage 8, driving mechanism 9, it is characterized in that valve shaft 3 two ends all are equipped with rolling bearing 5, on the valve shaft 3 between rolling bearing 5 and valve body 1 inner chamber, some groups of outside framework oil seals 4 are housed.