CN86205999U - Stop valve with sealing diaphragm of shaft - Google Patents

Abstract

The utility model discloses a stop valve with sealing diaphragm of a shaft, and the diaphragm is a sac. The sac shape diaphragm case (3) is provided with a closed end, a corrugated sidewall and an everting skirt edge with an upwards opening which are all arranged at the lower part. A valve cup shafting comprises a valve stem (7), a locking ring (6) and a valve flap (11), and the whole valve cup shafting is completely enveloped to become a skirt edge with an opening which is compacted and fixed between a valve cover (5) and a valve body (1). Upper and lower isolation sleeves (8), (9) arranged in the diaphragm case (3) isolates the sidewall of the diaphragm case at the valve stem (7). A supporting ring (4) sheathed at the outside of the isolation sleeves on the same shaft with the isolation sleeves can make the diaphragm not contact with the joint of the upper and lower isolation sleeves. Compared with the prior art, the utility model makes improvements on sealing performance and reliability.

Description

Stop valve with sealing diaphragm of shaft

The utility model belongs to a kind of stop valve of tape spool seal dissepiment.

Existing stop valve mainly adopts the method for filling out stuffing box packing at the gap location of valve rod and valve gap to overcome in the valve body medium to external leakage.Yet this traditional encapsulating method shows many shortcomings.Now existing the non-leakage stopping valve of packing film is encrypted by whole stem shaft system, as No. 85202143, the utility model patent of China's bulletin.The bonnet lower of this valve is a turbination, is encapsulated with rubber shell elastic sealing elements (diaphragm of rubber) on this obconic outer side surface.This layer barrier film also will fall simultaneously the valve head of " T " font valve rod to be close to, this layer barrier film can with the medium in the valve body fully and the external world be isolated, be a kind of more satisfactory non-leakage stopping valve.When but this valve descends when valve rod, seal this layer diaphragm of rubber of bonnet lower turbination side and will be pullled tensioning, if the system pressure of medium is big in the valve, this layer be tensioned attenuation diaphragm of rubber can be attached on the body of rod of valve rod tightly, like this, when valve rod when doing elevating movement, have the possibility of rolling brokenly this layer diaphragm of rubber.

The purpose of this utility model is to provide a kind of sealability more good, the more reliable ripple bag type paste seal dissepiment system of working.

The utility model is by the shape of the elastic diaphragm that improves known technology and increases some with so that barrier film is isolated from the part of valve rod fully realizes.

Solution of the present utility model is: in order to overcome the valve rod tensioning state that barrier film was subjected to when doing elevating movement, barrier film is made the elastic diaphragm capsule of the band corrugated sidewalls of capsule bag shape.Can be close to valve rod in order to overcome diaphragm of rubber under medium system pressure, the danger that it may be rolled brokenly when valve rod is done elevating movement adds separation sleeve and support ring up and down, and diaphragm of rubber can not be contacted with the valve rod of motion all the time.

This stop valve does not use stuffing box packing, and uses a sealing bellows that stem shaft system (flap, valve rod, lock ring) is sealed fully to stop the gap of medium by valve rod and valve gap in the valve body to external leakage.The bellows of this sealing adopts the material (as General Purpose Rubber or organic silicon rubber) with deformation behavior mold formed.It is shaped as the capsule bag of a band corrugated sidewalls, and its opening is sealed whole axle system up from the bottom up, and flap is close in the bottom of bellows, and the opening shirt rim on top is compacted and be fixed between valve gap and the valve body.The outer coaxial separation sleeve up and down that is with of valve rod, their effect is that the valve rod of elastic diaphragm and motion is isolated, prevents the possibility that elastic diaphragm is rolled brokenly when stem movement.Last separation sleeve and valve gap, valve body keep static relatively stationary state, and following separation sleeve then is seated on the flap, and the two is coaxial socket state each other, following separation sleeve when doing elevating movement with valve rod with respect on the isolation interplanting move axially.Owing to have relative axial motion between the separation sleeve up and down, under pressure medium, be adjacent to locating with one voice of two separation sleeves so also should prevent the corrugated sidewalls of bellows.So on this position, arrange a support ring again.The effect of support ring is to get in the position of locating with one voice that stops the corrugated sidewalls of elasticity diaphragm capsule to cling to two separation sleeves under the system pressure effect of medium.Support ring is to be free state ground to be embedded in the fold of corrugated sidewalls, is horizontal positioned.

The utility model has the advantages that: the corrugated sidewalls of the elastic packing bellows of capsule bag shape indefatigability is at work destroyed, and also valve rod that can passive movement rolls brokenly, and the reliability of work and working life are all than existing technical scheme ideal.

Accompanying drawing below in conjunction with embodiment elaborates:

Accompanying drawing is the utility model embodiment's a plan view, and separation sleeve, (9) separation sleeve, (10) lock ring, (11) flap are down gone up in (1) valve body, (2) valve seat, (3) elastic packing ripple sylphon, (4) support ring, (5) valve gap, (6) seal ring, (7) valve rod, (8).What this stop valve adopted as shown in drawings is diaphragm type shaft sealing scheme.Barrier film (3) is made into capsule bag shape, and its opening has the shirt rim sidewall of outwards routing up to be corrugated up, and its material is a rubber, is molded as shape as shown in the figure.The capsule bag is sealed valve rod (7), flap (11) integral body from the bottom up fully.Be coaxial socket state between two separation sleeves up and down, the horn mouth of last separation sleeve (8) becomes the pressure-bearing of the shirt rim of bellows (3) upward opening to be relied on, the two is stacked to be secured in a press between valve body (1) and valve gap (5) after together, the horn mouth of following separation sleeve (9) down, it is seated on the top-surface camber of flap (11), the two has identical radian, and when valve rod (7) when being in jacking condition, following separation sleeve (9) is done relative moving axially with respect to last separation sleeve (8).Be inserted in a support ring (4) again in the outside of separation sleeve up and down, it is embedded into the fold place of bellows (3) corrugated sidewalls, is horizontal positioned.Be provided with a seal ring (6) on the valve rod hole top of valve gap (5), in case the dirt of outside enters the gap of valve gap and valve rod.The valve rod of this stop valve (7) is (flap (11) contacts with valve seat (2)) when going downwards to extreme lower position, the corrugated sidewalls of bellows (3) can not be in disadvantageous tensioning fatigue state, support ring (4) and up and down separation sleeve guaranteed that the elastic diaphragm of bellows (3) can not roll brokenly by passive movement spare, so sealing and reliability make moderate progress than prior art.

Claims (5)

1, a kind of diaphragm type shaft sealing stop valve.It includes valve body (1), valve seat (2), valve gap (5) and by the axle system [valve rod (7), lock ring (6), flap (11)] that barrier film is sealed, it is characterized in that:

A, the barrier film of sealing bearing are the elastic corrugated bellows of a capsule bag shape, and it is made by the material with deformation behavior.It is sealed whole axle system (valve rod, lock ring, flap) from the bottom up.Flap (11) is close in the bottom of bellows.The sidewall of bellows is a corrugated.The shirt rim of bellows upward opening is compacted and be fixed between valve gap (5) and the valve body (1),

B, be placed in that valve rod (7) is outer a separation sleeve of two rigidity up and down, separation sleeve is coaxial slip socket state each other up and down,

C, be with support ring (4) in the outside of described up and down separation sleeve, it is freely embedded the fold place at the corrugated sidewall, is horizontal positioned.

2, diaphragm type shaft sealing stop valve as claimed in claim 1 is characterized in that, described its horn mouth that makes progress of separation sleeve (8) of going up relies on the two stacked being clamped and fixed in together between valve body (1) and the valve gap (5) as the pressure-bearing of bellows (3) shirt rim.

3, diaphragm type shaft sealing stop valve as claimed in claim 1 or 2, it is characterized in that, described its downward horn mouth of separation sleeve (9) down has and the identical radian of flap (11) top-surface camber, and it is seated on the flap (11), and the pressure-bearing that becomes bellows (3) bottom elastic diaphragm is relied on.

4, diaphragm type shaft sealing stop valve as claimed in claim 1 or 2 is characterized in that, the described elastic corrugated bellows of capsule bag shape (3) is to adopt rubber as material.

5, diaphragm type shaft sealing stop valve as claimed in claim 3 is characterized in that, the described elastic corrugated bellows of capsule bag shape (3) is raw material with rubber.

Images