CN2893339Y

CN2893339Y - Electric vacuum valve

Info

Publication number: CN2893339Y
Application number: CN 200620096323
Authority: CN
Inventors: 王洪运; 周达; 李世斌; 张军仿; 吴友林; 彭琪波
Original assignee: HUBEI HONGCHENG GENERAL MACHINERY CO Ltd
Current assignee: Hubei Hongcheng General Machinery Co., Ltd.
Priority date: 2006-04-20
Filing date: 2006-04-20
Publication date: 2007-04-25
Anticipated expiration: 2016-04-20

Abstract

An electric vacuum butterfly valve is provided. The utility model is characterized in that: a disc in arranged in a valve body, and a valve shaft is connected to the disc, and the valve shaft also has a self-lubricating bearing; while an electric actuator is connected with the valve shaft, and the disc takes a shape of a truss, and the valve body is provided with a electric tracing belt, wherein the axial end triple seal of the valve is that the valve shafts are respectively provided with an O ring seal and two symmetrical framework ring seals and two sets of symmetrical fillers; while a primary double seal is that the disc is provided with two T-shaped ring seals with the valve shaft as the symmetrical point. The utility model has reliable bi-directional seal and valve shaft sealing performances, adjustable sealing, good abrasion resistance and long valve service life.

Description

The Motorized vacuum butterfly valve

Affiliated technical field:

The utility model relates to butterfly valve, particularly relates to the Motorized vacuum butterfly valve.

Background technique:

Along with the quick stable development of national economy, country is increasing to the demand of electric power, thermal power plant is as the main force of power network, country drops into also it and increases thereupon, in the vacuum system of thermal power plant, between steam turbine and condensing engine, vacuum valve is to guarantee the system vacuum degree, improve turbine efficiency, ensure the key equipment of the normal operation of unit.Conventional vacuum butterfly valve, its shaft end seal adopts the seal form of O-ring seals and filler, because valve shaft constantly moves, can not get compensation after O-ring seals and the filler wearing and tearing, so the sealability of valve can not get guaranteeing that the working life of valve is short.

Summary of the invention:

The purpose of the present utility model: in order to overcome existing vacuum butterfly valve sealability deficiency, the utility model provides a kind of Motorized vacuum butterfly valve, and this is that a kind of sealing is tight, reliable, the valve of long service life.

The technical solution of the utility model realizes as follows:

The utility model includes Electric actuator, valve body, butterfly plate, valve shaft, self oiling bearing, and butterfly plate is in valve body, and valve shaft has self oiling bearing on the valve shaft on butterfly plate, and Electric actuator is connected with valve shaft; Its butterfly plate is a truss structure; Valve body is provided with electric-heating belt; Valve be sealed into axle head triple seal and primary seal double seal; Shaft end seal is to be provided with O-ring seals at the promptly close butterfly plate end of the front end of valve shaft, and the centre is provided with the matrix type seal ring of two symmetries, and the rear end is provided with the filler of two groups of symmetries; Its primary seal be on butterfly plate, be provided with the valve shaft be the symmetry two T shape seal rings.

Good effect of the present utility model is:

1, the utility model overall vacuum good seal performance, its primary seal adopts the sealing configuration of symmetry, makes its two way sealed effective, seals adjustablely, and double-sealing can cut off ambient air and vacuum system fully after bath.

2, shaft end seal of the present utility model adopts self tightening and pre-profiling triple seal structure, has satisfied the requirement of the sealing of valve shaft, does not have leakage fully.

3, butterfly plate adopts two dull and stereotyped truss structures, its good rigidly, and flow resistance is little.

4, behind the electric-heating belt of the secondary position of valve body external sealed, when external temperature is low in the winter time, also can keep seal ring position constant temperature, guarantee valve seal, adapt to northern extremely frigid zones especially and use.

Description of drawings:

Fig. 1, the utility model structural representation.

Fig. 2, partial enlarged drawing I

Fig. 3, partial enlarged drawing II

Embodiment:

With reference to accompanying drawing embodiment, the utility model is further described:

Embodiment 1:

Among Fig. 1, butterfly plate 9 is contained in the valve body 10, and valve shaft 8 is connected with butterfly plate 9, and valve shaft 8 is equipped with self oiling bearing 4 with valve body 10 contact position, and Electric actuator 1 is connected with butterfly plate 9; The shaft end seal of its valve is the triple seal that is sealed into of valve shaft 8 and valve body 10, front end at valve shaft 8 is equipped with O RunddichtringO 6, and the skeleton shape seal ring 3 of 2 symmetries is equipped with in the centre, skeleton shape seal ring 3 under the effect of middle skeleton all the time and produce stable seal pressure between the valve shaft 8, under the work of inside and outside differential pressure, the seal ring swelling has increased seal pressure, simultaneously, oiling in the Seal cage, prevent gas leakage, 2 skeleton shape seal ring 3 symmetric arrangement, sealing is reliable; The filler 2 of 2 groups of symmetries is equipped with in the rear end, and two way sealed is reliable, and each group filler 2 is formed by 5, can form the three seals ring, and its wear resistance is strong.

Electric-heating belt 5 is contained on the valve body 10, and primary seal is double seal, i.e. the sealing of butterfly plate 9 and valve body 10; 2 T shape seal ring 7 relative valve shaft 8 symmetries are contained on the butterfly plate 9, can guarantee the valve two way sealed.

Embodiment 2:

Among Fig. 2, self oiling bearing 4 is housed on the valve shaft 8, front end is equipped with O-ring seals 6; The skeleton shape seal ring 3 of 2 symmetries is equipped with in the centre; The filler 2 of 2 groups of symmetries is equipped with in the rear end, each group filler 2 is formed by 5, oiling in the Seal cage of the seal ring 3 of two skeleton shapes, in valve shaft 8 rotation processes, automatically regulate the sealing of filler 2 by wavy spring, if filler 2 wearing and tearing, compress wavy spring and filler 2 is regulated by the adjusting screw on the filler 2.

Embodiment 3:

Among Fig. 3, T shape seal ring 7 is contained on the butterfly plate 9, and the sealing seat of valve body 10 is a stainless steel material, and T shape seal ring 7 is an ebonite, regulates T shape seal ring 7 by adjusting screw, makes the secondary sealing of primary seal reliable.

Claims

A kind of Motorized vacuum butterfly valve includes Electric actuator, valve body, butterfly plate, valve shaft, self oiling bearing, and butterfly plate is in valve body, and valve shaft is connected on the butterfly plate, and self oiling bearing is arranged on the valve shaft, and Electric actuator is connected with valve shaft; It is characterized in that: butterfly plate is a truss-like, valve body is provided with electric-heating belt, valve be sealed into axle head triple seal and primary seal double seal, shaft end seal is to be provided with O-ring seals at the promptly close butterfly plate end of the front end of valve shaft, the centre is provided with the skeleton shape seal ring of two symmetries, and the rear end is provided with the filler of two groups of symmetries; Primary seal be on butterfly plate, be provided with the valve shaft be the symmetry two T shape seal rings.