CN2197531Y

CN2197531Y - Gas shut-off valve

Info

Publication number: CN2197531Y
Application number: CN 94219345
Authority: CN
Inventors: 史振海; 周殿华; 周志坚
Original assignee: Shijiazhuang City No3 Valve Factory
Current assignee: Shijiazhuang City No3 Valve Factory
Priority date: 1994-08-13
Filing date: 1994-08-13
Publication date: 1995-05-17
Anticipated expiration: 2004-08-13

Abstract

The utility model relates to a gas cut-off valve, which is the improvement of an inserting plate valve with a single valve plate and a single sealing surface without a mechanical pressing device. A hydraulic driving cylinder, or a pneumatic driving cylinder, or an electric fitting driving cylinder is used to drive a slider-crank mechanism which is connected with a valve plate, and thus the valve plate is in reciprocating movement along a slideway. A lever-type self-potential pressing mechanism is additionally provided for improving the sealing performance of the valve. The cut-off valve has the advantages of compact structure, small volume, convenient installation and maintenance, and good sealing performance. The utility model is particularly suitable for being used as a gas cut-off valve or an air cut-off valve in a pipe network of a metallurgy hot blast stove.

Description

Gas shut-off valve

The utility model relates to a kind of gas stop valve, belongs to the guiding valve technical field with flat sealing surface, particularly a kind of guiding valve of the Wedge device with sealing surface.

Used cut-off valve in the gas pipeline network, at present generally use a kind of Single disc list sealing surface not have the guiding valve of mechanical hold down gag, also claim push-pull valve or combustion valve, what its plate motion was adopted is gear, tooth bar transmission or direct-connected liquid cylinder (pneumatic linear actuator), volume is big especially, brings a lot of inconvenience for the I﹠M of applying unit; Because valve is provided with mechanical clamping device, only utilize the pipeline pressure reduction at valve two ends and fixed voussoir to realize sealing, in addition so the sealability of this valve is relatively poor.

The purpose of this utility model is to disclose a kind of more compact structure, the shut off gas valve of favorable sealing property.

Task of the present utility model is achieved in that the to-and-fro motion driving mechanism of valve plate is a connecting rod that is connected with valve plate, the slidercrank mechanism that the fork that is connected with connecting rod constitutes, the fork of this mechanism are driven by hydraulic pressure, pneumatic or Vidacare corp clutch release slave cylinder and do angular displacement; This guiding valve also is provided with a self-alignment formula lever hold-down mechanism, and clamping lever is connected with gusset on the upper valve body through lever seat, and when valve plate was closed, the long arm end of clamping lever contacted with the inclined-plane of valve plate periphery, and the galianconism end of clamping lever contacts with the intermediate portion of valve plate.

Adopt after the above-mentioned improvement project, the valve plate flexible operation reduces the geometric volume of whole valve effectively, dwindles installing space, for user's pipe network layout is brought a lot of convenience.The Lever type hold down gag is the simplest mechanical clamping device of a kind of structure, be convenient to installation and maintenance, the compacted position can regulate, and the valve plate resistance to motion is little when compressing, impacting force is even, sealing is reliable, and this novel valve can be widely used in the pipe network in the metallurgical hot blast stove system, as the cut-off valve of coal gas or air.

With regard to drawings and Examples the utility model is specified below.

Fig. 1 is the cut-off valve plan view.

Fig. 2 is the attached view of Fig. 1.

Fig. 3 is a self-alignment formula lever hold-down mechanism partial enlarged view.

Upper valve body 1 and following valve body 2 are connected to become a seal chamber by bolt among the figure, and valve plate 4 does reciprocating linear motion along chamber inner slide 8, and sealing surface is on the junction plane of valve plate 4 and following valve body 2.Oil hydraulic cylinder 9 drives rocking arm 7, makes rocking arm 7 produce a pivot angle, and generally this pivot angle is less than 90 °.Fork 6 is synchronized with the movement by stem shaft 3 and rocking arm 7, also produces same pivot angle.Fork 6, connecting rod 5 constitute a slidercrank mechanism with valve plate 4, and the angular displacement of fork 6 makes valve plate 4 do straight reciprocating motion like this, finishes the keying of valve.

Self-alignment formula lever hold-down mechanism is by clamping lever 10, and lever seat 11 is formed.Lever seat 11 is installed on the gusset 15 in upper valve body 1 chamber.The periphery of valve plate 4 is an inclined-plane, and when valve plate was closed, this inclined-plane contacted with the long arm end 12 of clamping lever 10 earlier, and long arm end 12 is moved upward, and galianconism end 13 moves downward, and galianconism end 13 is pressed in the middle part of valve plate 4.The characteristics of this hold-down mechanism are the positions that the required impacting force size of valve plate depends on clamping lever, and after lever seat installation adjustment was fixing, the size of impacting force then depended on the propelling position when valve plate is closed, and Here it is, and so-called self-alignment compresses.

Clamping lever 10 can adopt two lever bodies to be symmetrical arranged, and by two long-armed end points and two galianconism end points valve plate is formed at 4 and compresses.Another kind of scheme is to adopt the lever body of long-armed two galianconism, and two galianconism form at 3 to valve plate and compress according to long-armed being symmetrical arranged.

Oil hydraulic cylinder 9 can substitute with pneumatic linear actuator or Vidacare corp.

Claims

1, a kind of shut off gas valve, comprise valve body up and down, valve plate, valve plate motion driving mechanism, it is characterized in that described valve plate motion driving mechanism is a slidercrank mechanism, form with the fork that is connected with connecting rod by the connecting rod that is connected with valve plate, this fork is by hydraulic pressure, pneumatic or Vidacare corp clutch release slave cylinder drives, also be provided with a self-alignment formula or lever hold-down mechanism, clamping lever is connected with gusset on the upper valve body through lever seat, when valve plate is closed, the long arm end of clamping lever contacts with the inclined-plane of valve plate periphery, and the galianconism end of clamping lever contacts with the intermediate portion of valve plate.

2, by the described shut off gas valve of claim 1, it is characterized in that described clamping lever is made up of symmetrically arranged two lever bodies, have two long-armed and two galianconism, when the valve plate closure, 4 of valve formation are compressed.

3, by the described shut off gas valve of claim 1, it is characterized in that described clamping lever is provided with the galianconism of long-armed two symmetries, when valve plate is closed, valve plate is formed at 3 compress.