CN2474817Y

CN2474817Y - Valve

Info

Publication number: CN2474817Y
Application number: CN 01219812
Authority: CN
Inventors: 郑兵
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-04-19
Filing date: 2001-04-19
Publication date: 2002-01-30
Anticipated expiration: 2011-04-19

Abstract

The utility model discloses a valve for pipes used in the systems with high temperature, high pressure water and high pressure gas in the industries of electric power and chemical, comprising a valve body, wherein the valve body is provided with the input and output channels for gas and liquid, besides the valve body is provided with valve handles which can drive valve core. The front end of the valve core is also provided with a valve core. The utility model employs two seal engagements between double valve cores and valve seat, assuring the sealing reliability by double sealing.

Description

Valve

The utility model discloses the valve that uses in high temperature in a kind of electric power and the chemical industry, high pressure water, the vapour system pipeline.

At present, in China's electric power and the chemical industry in high temperature, high pressure water, the vapour system pipeline valve many kinds are arranged, but all there is leakage phenomenon in different situations, and it is following several to trace it to its cause: high-temperature high-pressure medium impacts the damage that causes to valve, and the more little impact of aperture is big more; Valve fits badly, and promptly valve is crack makes valve be in throttle and impacted, the damage that causes, and this situation is hit greatly and is very general; Owing to the spacing inaccurate valve that causes is fitted badly; Owing to impurity particles such as welding slag in maintenance process or the pipeline rest the sealing surface place valve is fitted badly; Be exactly that valve rod damages in addition, stuck the fitting badly of valve of causing as reasons such as valve rod bendings.

Certainly also just like reasons such as workmanships, general sealing surface mostly is pile-up welding hard alloy, and the cemented carbide hardness of import also can only reach HRC42, and spool, valve seat do not wash away because of hardness is anti-inadequately.

The purpose of this utility model provides a kind of valve of guaranteeing that valve tube is tight, the impact of minimizing medium causes damage.

For achieving the above object, the technical solution adopted in the utility model is: a kind of valve, it comprises valve body, valve body is provided with vapour-liquid input, output channel, be provided with in the valve body and can drive the valve rod that spool moves, valve body is provided with the assembly that is used for fixing with sealed valve stem, it is characterized in that: the front end of spool also is provided with a spool, be provided with spring between two spools, two spools independently are sealed and matched separately with the sealing position corresponding formation twice of valve seat, and described sealing position is between the vapour-liquid input that is provided with on the valve body, output channel.

Compared with prior art, constituting two places between the utility model employing double spool and the valve seat is sealed and matched, seal operation in the structure of this two seals is independently to finish, when one of them as poorly sealed situation occurring, another road sealing will continue to finish seal operation, and have only one sealing in the prior art, in case poorly sealed situation occurs, valve just can't be closed tight; In addition, the utility model adopts two seals, even one can play good throttling action to sealing not close tight also; help another road sealing surface and close tight, as long as and have one sealing surface to close tight, just can make medium form " dead stream "; be that medium stops to flow, thereby the protection sealing surface is avoided washing away.

Description of drawings

Fig. 1 is an assembly structure schematic representation of the present utility model;

Fig. 2 is the structural representation of flow damper.

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

Embodiment

Referring to Fig. 1, valve comprises valve body 10, and valve body 10 is provided with vapour-liquid input, output channel 11,12, is provided with in the valve body 10 and can drives the valve rod 20 that spool 30 moves, valve body 10 has been provided with the assembly of fixing and seal action, and these assemblies fixing and seal action can be with reference to prior art.The front end of spool 30 also is provided with a spool 40, be provided with spring 60 between two spools 30,40, two spools 30,40 independently are sealed and matched separately with the sealing position corresponding formation twice of valve seat 50, and described sealing position is between the vapour-liquid input that is provided with on the valve body 10, output channel 11,12.This shows that the utility model adopts double spool 30,40 and sealing surface on the valve seat 50 to constitute the two seals face to cooperate, by the reliability of enforcement double sealing to guarantee to seal.

Step-like cylindrical spool 40 is positioned at the internal cavity of spool 30; stretch out from spool 30 front end face at the forward end seal position of the smaller diameter end of spool 40; the afterbody of spool 30 links to each other with valve rod 20; spool 30 inside of spring 60 between valve rod 20 and spool 40; elastic force effect lower valve core 30 front end face at above-mentioned spring 60 cooperate with valve seat 50; spool 30; 40 and valve rod 20 three's axle cores overlap each other; spring 60 is designed to belleville spring; make spool 40 be in the tight state that gives all the time at the internal cavity of spool 30; and can regulate it and give tightness; to guarantee the power of fastening of valve; also make simultaneously spacing easier adjustment; avoid valve crack state to occur, also can effectively prevent spool 30; 40 and valve seat 50 between bump, the protection sealing surface.In addition, adopt spraying technology to give spool 30,40 and valve seat 50 surface sprayings with layer wearing layer, hardness can reach HRC65, makes spool 30,40 and valve seat 50 more anti-washing away.

Between spool 30 and vapour-liquid input 11, be provided with the flow damper 120 of labyrinth-like, between the outer wall of the inwall of flow damper 120 and spool 30 for movingly, as shown in Figure 2, flow damper 120 adopts the labyrinth-like of nested, it can change flow direction, control flows rate of flow of fluid, reduces fluid energy, reduce pressure, prevents fluid cavitation step by step, reduce fluid washing away to spool 30,40 and valve seat 50, also can play simultaneously the effect of filter screen, stop intrasystem impurity to enter in the valve, avoid valve to occur crack state on the sealing surface because of impurity rests.

The inner end of the valve rod 20 oblate post 21 of a diameter that be connected greater than valve rod 20 diameters, being arranged with on this place's valve rod 20 is with externally threaded and cap 130, and the screw-internal thread fit on cap 130 and the spool 30 will above-mentioned oblate post 21 with and cap 130 be connected as a single entity the floating type connection of employing between valve rod 20 and the operating mechanism with spool 30.

Valve rod 20 1 ends link to each other with spool 30, move in the hole that the shaft of valve rod 20 is offered on filler body 70, self sealing structure is adopted at the valve gap position, the cross section that specifically comprises filler body 70 is roughly H shape, be provided with the filler 80 that seals between filler body 70 and the valve rod 20, there is Gland 90 filler 80 outsides, 100 and bolt 110 fixing with filler body 70, the other end of valve rod 20 is positioned at above-mentioned Gland 90, the outside of the fixed connecting piece that pressing plate 100 constitutes, the outside middle section position place of filler body 70 is step-like, by pressure ring 140, sealing gland 150, pressing plate 160, bolt 170 cooperates valve seat 50, flow damper 120, filler body 70 is by being fixed on the valve body 10 from the outside order in lining.

Below briefly introduce working principle of the present utility model: medium enters from vapour-liquid input channel 11, through the labyrinth-like alternate path 121 on the buffer 120 among Fig. 2, constantly by each throttle orifice 122 throttlings and change direction reduce pressure power consumption, control flow velocity, prevent cavitation.Simultaneously the prevention of the larger particles impurity in the medium in buffer 120 outsides, prevent to rest on the sealing surface and form little aperture and wash away.When operating mechanism drive valve rod 20 moves down, spool 30,40 moves down, when spool 40 when sealing surface on the valve seat 50 contacts, valve rod 20 continues to move down butterfly spring 60, make spool 30 continue to move down, up to compressing sealing surface, form once by the sealing surface on spool 30 and the valve seat 50 like this and turn-off, sealing surface on spool 40 and the valve seat 50 forms secondary and turn-offs, as long as once turn-off tight, can both form strict sealing, and form " dead stream ", the protection sealing surface is avoided washing away; Valve rod 20 is downward more, and the impacting force of butterfly spring 60 is big more, and it is tight more that sealing surface cooperates, and the tight power of giving of butterfly spring 60 realizes by adjusting and cap 130.Otherwise, when operating mechanism drive valve rod 20 moves up, drive spool 30,40 and move up, more upwards aperture is big more, and last fluid is discharged through output channel 12.

Claims

1. valve, it comprises valve body (10), valve body (10) is provided with the vapour-liquid input, output channel (11), (12), be provided with in the valve body (10) and can drive the valve rod (20) that spool (30) moves, valve body (10) is provided with and is used for fixing and the assembly of sealed valve stem (20), it is characterized in that: the front end of spool (30) also is provided with a spool (40), two spools (30), (40) be provided with spring (60) between, two spools (30), (40) independently be sealed and matched separately with the sealing position corresponding formation twice of valve seat (50), described sealing position is positioned at valve body (10) and goes up the vapour-liquid input that is provided with, output channel (11), (12) between.

2. valve according to claim 1, it is characterized in that: step-like cylindrical spool (40) is positioned at the internal cavity of spool (30), stretch out from spool (30) front end face at the forward end seal position of the minor diameter on the spool (40), the afterbody of spool (30) links to each other with valve rod (20), spring (60) is positioned at spool (30) inside between valve rod (20) and the spool (40), elastic force effect lower valve core (30) front end face at above-mentioned spring (60) cooperates with valve seat (50), and spool (30), (40) and valve rod (20) three's axle core overlap each other.

3. valve according to claim 1 and 2, it is characterized in that: the flow damper (120) that between spool (30) and vapour-liquid input (11), is provided with labyrinth-like, between the outer wall of its inwall and spool (30) for movingly, the inner end of valve rod (20) the oblate post (21) of a diameter that be connected greater than valve rod (20) diameter, be arranged with on this place's valve rod (20) and be with externally threaded and cap (130), and the screw-internal thread fit on cap (130) and the spool (30) is connected as a single entity above-mentioned oblate post (21) and cap (130), spring (60) and spool (30), (40).

4. valve according to claim 3, it is characterized in that: valve rod (20) one ends and spool (30) are connected, move in the hole that the shaft of valve rod (20) is offered on filler body (70), the cross section of filler body (70) is roughly H shape, be provided with the filler (80) that seals between filler body (70) and the valve rod (20), there is Gland (90) filler (80) outside, (100) and bolt (110) and filler body (70) fixing, the other end of valve rod (20) is positioned at above-mentioned Gland (90), the outside of the fixed connecting piece that pressing plate (100) constitutes, the outside middle section position place of filler body (70) is step-like, pressure ring (140), sealing gland (150), pressing plate (160), bolt (170) cooperates valve seat (50), flow damper (120), filler body (70) is by being fixed on the valve body (10) from the outside order in lining.