CN202017779U

CN202017779U - Mechanical seal structure of stop valve

Info

Publication number: CN202017779U
Application number: CN2011200730487U
Authority: CN
Inventors: 谢吉材
Original assignee: Xiamen Bangzhong Technology Co Ltd
Current assignee: Xiamen Bangzhong Technology Co Ltd
Priority date: 2011-03-18
Filing date: 2011-03-18
Publication date: 2011-10-26
Anticipated expiration: 2021-03-18

Abstract

The utility model discloses a mechanical seal structure of a stop valve, which comprises a sealed cylinder, a piston and a seal pressing part. The sealed cylinder and a piston are mounted on an upper valve body, a piston ring is arranged outside an upper passage, the bottom of a piston cavity is communicated with a slide way of the stop valve, and the seal pressing part is fixed to the lower end of the piston. The sealed cylinder is matched with the piston to control lifting of the seal pressing part so as to achieve sealing. Compared with the prior art only using a seal to achieve sealing, the mechanical seal structure cannot wear the seal pressing part during opening and closing of a valve plate, so that stopping and sealing effect of the stop valve is guaranteed always the same, and normal use of the stop valve is guaranteed.

Description

The mechanical seal structure of stop valve

Technical field

The utility model relates to the technical field of stop valve, and is special relevant with its mechanical seal structure.

Background technique

Stop valve is the switch that is used to control fluid (solid particle, powder, liquid), to being sealed with strict requirement, is mainly used in chemical engineering industry and plastics industry etc.

In the prior art, the structure of stop valve is made up of upper valve body 10, following valve body 20, gate valve cylinder 30 and valve plate 40 roughly as shown in Figure 1.Corresponding upper channel 50 and the lower channel 60 that flows through for fluid that form forms the chute 70 that slides for valve plate 40 on upper valve body 10 and the following valve body 20 between upper valve body 10 and the following valve body 20, is provided with Sealing 80 between valve plate 40 and the chute 70.During use, in chute 70, slide, upper channel 50 and lower channel 60 are communicated promptly open stop valve, or promptly close stop valve by valve plate 40 obstruct upper channels 50 and lower channel 60 by gate valve cylinder 30 control valve plates 40.The sealing of this stop valve is to realize by Sealing 80, and in the process of switch valve plate 40 repeatedly, Sealing 80 very easily weares and teares, be out of shape, causes to seal defectively, directly influences the normal use of stop valve.

In view of this, the inventor improves the sealing configuration of existing stop valve, and this case produces thus.

The model utility content

The purpose of this utility model is to provide a kind of mechanical seal structure of stop valve, to guarantee the sealing effect that ends of stop valve, guarantees the normal use of stop valve.

To achieve these goals, the technical solution of the utility model is as follows:

The mechanical seal structure of stop valve is made up of sealing cylinder, piston and packing follower, and sealing cylinder and piston are installed on the upper valve body, and piston ring is located at outside the upper channel, and the below of piston cavity communicates with the chute of stop valve, and packing follower is fixed on the lower end of piston.

Be provided with seal ring between described piston and the piston cavity.

The upper valve body of described stop valve is formed by pedestal and core print seat winding, be formed centrally upper channel in the core print seat, be formed centrally center mounting hole in the pedestal for the core print seat winding, the sidewall of pedestal forms cylinder mounting holes, form piston cavity between the center mounting hole inwall of pedestal and the outer wall of core print seat, the top of piston cavity communicates with cylinder mounting holes and the below communicates with the chute of stop valve.

Described core print seat is fixed in the center mounting hole of pedestal by screw.

Be provided with seal ring between described core print seat and the pedestal.

After adopting said structure, the utility model applies on the stop valve, does the oscilaltion action by the sealing cylinder control piston in piston cavity.When sealing cylinder gets loose, drive piston and rise, there is not the pressure effect on the valve plate, the gate valve cylinder retreats, and drives valve plate and slides backward in chute, upper channel and lower channel is communicated, even stop valve is opened; When the gate valve cylinder advanced, the drive valve plate to front slide, made valve plate intercept upper channel and lower channel in chute, close sealing cylinder again, drive piston and descend, make piston and packing follower be pressed on the valve plate tightly, make the isolated fully sealing of upper channel and lower channel, even stop valve is closed.

The utility model is to be cooperated by sealing cylinder and piston to control the packing follower lifting, to realize seal action, only compare with prior art by Sealing realization seal action, in the process of valve plate switch, the utility model does not have wearing and tearing to packing follower, what guaranteed stop valve ends sealing effect all the time as before, has guaranteed the normal use of stop valve.

Below in conjunction with drawings and the specific embodiments the utility model is described in further details.

Description of drawings

Fig. 1 is the structural representation of existing stop valve;

Fig. 2 is a structural representation of the present utility model.

Label declaration

10 times valve bodies 20 of upper valve body

Gate valve cylinder 30 valve plates 40

Upper channel 50 lower channels 60

Chute 70 Sealings 80

Sealing cylinder 1 piston 2

Piston cavity 21 seal rings 22

Seal ring 23 packing followers 3

Pedestal 4 center mounting holes 41

Cylinder mounting holes 42 core print seats 5

Screw 51 seal rings 52.

Embodiment

As shown in Figure 2, be preferred embodiment of the present utility model.

The mechanical seal structure of this stop valve is made up of sealing cylinder 1, piston 2 and packing follower 3.Sealing cylinder 1 and piston 2 are installed on the upper valve body 10, and piston 2 ring is located at outside the upper channel 50, and the below of piston cavity 21 communicates with the chute of stop valve 70, and packing follower 3 is fixed on the lower end of piston 2.Wherein, be provided with seal ring 22 and seal ring 23 between this embodiment's piston 2 and the piston cavity 21, to guarantee the seal of entire mechanism.

Assemble sealing cylinder 1 and piston 2 for convenience, this embodiment is formed upper valve body 10 by pedestal 4 and core print seat 5 windings.Be formed centrally upper channel 50 in the core print seat 5.Be formed centrally the center mounting hole 41 for core print seat 5 windings in the pedestal 4, core print seat 5 can be fixed in the center mounting hole 41 of pedestal 4 by screw 51, in order to ensure the seal of entire mechanism, is provided with seal ring 52 between core print seat 5 and the pedestal 4; The sidewall of pedestal 4 forms cylinder mounting holes 42; Form piston cavity 21 between center mounting hole 41 inwalls of pedestal 4 and the outer wall of core print seat 5, the top of piston cavity 21 communicates with cylinder mounting holes 42 and the below communicates with chute 70.

In the actual use of the utility model, when sealing cylinder 1 gets loose, drive piston 2 and rise, do not have the pressure effect on the valve plate 40, can retreat drive by gate valve cylinder 30 and slide backward in chute 70, upper channel 50 and lower channel 60 are communicated, this moment, stop valve was opened; When gate valve cylinder 30 advances, drive valve plate 40 in chute 70 to front slide, intercept upper channel 50 and lower channel 60, close sealing cylinder 1 again, driving piston 2 descends, piston 2 and packing follower 3 are pressed on the valve plate 40 tightly, make the isolated fully sealing of upper channel 50 and lower channel 60, and this moment, stop valve was closed.

It below only is preferred embodiment of the present utility model; be not to restriction of the present utility model, in the ken that those of ordinary skills possessed, based on the key points in design of this case; the many variations that its concrete example is made, but all should fall in the protection domain of this case.

Claims

1. the mechanical seal structure of stop valve, it is characterized in that: be made up of sealing cylinder, piston and packing follower, sealing cylinder and piston are installed on the upper valve body, and piston ring is located at outside the upper channel, the below of piston cavity communicates with the chute of stop valve, and packing follower is fixed on the lower end of piston.

2. the mechanical seal structure of stop valve according to claim 1 is characterized in that: be provided with seal ring between described piston and the piston cavity.

3. the mechanical seal structure of stop valve according to claim 1, it is characterized in that: the upper valve body of described stop valve is formed by pedestal and core print seat winding, be formed centrally upper channel in the core print seat, be formed centrally center mounting hole in the pedestal for the core print seat winding, the sidewall of pedestal forms cylinder mounting holes, form piston cavity between the center mounting hole inwall of pedestal and the outer wall of core print seat, the top of piston cavity communicates with cylinder mounting holes and the below communicates with the chute of stop valve.

4. as the mechanical seal structure of stop valve as described in the claim 3, it is characterized in that: described core print seat is fixed in the center mounting hole of pedestal by screw.

5. as the mechanical seal structure of stop valve as described in the claim 3, it is characterized in that: be provided with seal ring between described core print seat and the pedestal.