CN2132040Y

CN2132040Y - Leakproof pressure stop valve

Info

Publication number: CN2132040Y
Application number: CN 92214752
Authority: CN
Inventors: 于长兴; 刘守权
Original assignee: SEALING ELEMENTS PLANT OF CHENGDU AIRCRAFT REPAIRING ENGINEERING Co CAAC
Current assignee: SEALING ELEMENTS PLANT OF CHENGDU AIRCRAFT REPAIRING ENGINEERING Co CAAC
Priority date: 1992-06-13
Filing date: 1992-06-13
Publication date: 1993-05-05
Anticipated expiration: 2002-06-13

Abstract

The utility model discloses a leakproof pressure stop valve, composed of a valve body, a valve cover, a screw rod, clip woven membrane sheet connected between a valve wall and a pressing block, and an elastic sealing element arranged at the end part of the pressing block. The utility model discloses the sealing device has the advantages of anti-pressure, excellent and reliable sealing performance, simple integrated structure, simple preparing process, and the inner leakage and the outer leakage of liquid and gas are effectively prevented.

Description

Leakproof pressure stop valve

The utility model relates to a kind of shutoff valve that is used for hot-water heating pipe pipeline.

The seepage of valve, water nozzle is a common phenomenon, and tracing it to its cause and all closing (sealing) with stop valve sternly is not that sealing difference or life-span are short relevant.The conventional seals pattern of valve is to adopt packing seal.The one, the jam type packing sealing, its seal element is a packing of making valve of asbestos or graphite, packing is positioned in valve rod and the formed packing cavity of valve gap, compressing packing with filler seals, its shortcoming is that flowing of convection cell only played throttling action, and it can not be prevented or seal, seepage is often arranged after the use; The requirement on machining accuracy of valve rod and packing cavity is very high; Owing to press very tightly, so the start or stop heaviness, asbestos belong to carcinogen, befouling environment.The 2nd, the automatic type packing seal, the seal element of this pattern is many to be made with elastomers such as rubber or plastics, be placed in the packing cavity equally, institute's difference is when system pressure increases, sealing force also increases thereupon, and its shortcoming is: seal element and sealed stem shaft have relative movement, rubs mutually and causes component abrasion, so seal not really reliably, and the life-span is short.

Chinese patent application 90215071.5 discloses a kind of stop valve with the bellow type diaphragm seal, and its seal element is the barrier film of the bellow type made with elastomer, and flap and bellows are made of one.The outward flange of bellows is clamped in the flange between valve body and the valve gap, sealed valve stem and valve gap simultaneously, and the elastomer of flap outsourcing and valve seat formation Elastic Contact have improved sealing effect.The reason that this top technology does not obtain promoting so far is, the barrier film of seal element one bellow type, and this structural type is not ideal, at first is its complex structure, has costed expensive rubber material, and production technology is bad, and manufacturing efficiency is extremely low, and scraps easily.

Given this, the purpose of this utility model provide a kind of simple in structure, sealing is reliable, the non-leakage stopping valve of long service life.

Above-mentioned purpose is achieved in that the briquetting that the utility model also has valve body, valve gap, screw rod and moved up and down by bolt rod driving, be characterized between valve wall and briquetting, being connected to the diaphragm that the screw rod Lift Part is sealed, the excellent sealability of diaphragm can obviously be improved the sealing effect to leaking, and its improved flexibility can increase the service life; Have on the lower end surface of briquetting when valve is worked can with the tight elastomer seal of Elastic Contact of valve port part, effectively stop the internal leakage of fluid.

Above-mentioned diaphragm is to adopt the mesosphere to accompany the diaphragm structure of fabric, what can increase diaphragm greatly deflects number of times and crushing resistance, improve working life, the outer ring of diaphragm is crimped between the connecting part of valve body and valve gap, its inner ring is then by the gland nut that is threaded with briquetting and place two compress gaskets of inner ring both sides and be fitted in briquetting, this Placement energy enhanced leaktightness also is convenient to diaphragm and is installed.

Above-mentioned valve gap is provided with tapered slope and the compress gasket spacing block face that rises in the inboard of its lower end surface.Outside carrying, screw rod risen that spacing block face limits and during off-position, above-mentioned folder fabric diaphragm is close to valve gap inferior pyramidal inclined-plane, can improve the withstand voltage degree of diaphragm to compress gasket; Compress gasket is limited by the confined planes of valve gap, also can prevent to press from both sides the fabric diaphragm and be drawn damage by unconfined lifting, thereby improve sealing reliability greatly.

The above-mentioned elastomer seal of being located on the briquetting is an elastic seal ring, and having on the lower end surface of briquetting can be for the dovetail groove of seal ring scarf.Adopt the scarf mode in conjunction with assembling and the replacing of being convenient to seal ring.

Have circular groove on the screw rod of the present utility model, also having groove with screw rod circular groove corresponding part on the screw rod hole wall of briquetting upper end, and the gap is built-in with ball silk back-up ring between the groove of correspondence.When valve was worked, screw rod was and rotatablely moves, but briquetting only moves up and down, and can guarantee does not like this have relative rotary motion between diaphragm and the briquetting.

The utlity model has following advantage:

1, owing to adopted the seal arrangement of the diaphragm of rubber fabric sandwich structure as the screw rod Lift Part, and when screw rod rises to compress gasket and is limited to the underpart of valve gap, folder fabric diaphragm is close to the tapered slope of valve gap, improved the withstand voltage degree of folder fabric diaphragm, thereby improved sealing reliability of the present utility model greatly, prevented the liquid of whole system or leaking of gas effectively.

2, briquetting with elastic seal ring of valve port part and end face contacts closely and has formed Elastic Contact, has strengthened the sealing at this position, prevented effectively liquid or gas in let out.

3, elastic seal ring of the present utility model is to be embedded in the dovetail groove of briquetting end face, if elastic seal ring is aging or damage, changes easily.

4, folder fabric diaphragm of the present utility model, simple in structure, technology is easy to manufacture, and cost is much lower than bellows, and the accepted product percentage height.

5, total of the present utility model is simple, and technology is made simple, and cost is low.Can on general on the market common standards valve at present, not carry out big improvement, just can implement,, embody whole social benefit quickly easily so be easy to promote.

Further specify the utility model below in conjunction with drawings and Examples.

Fig. 1 is a structural representation of the present utility model

The utility model (see figure 1), has valve body 1, bolt is connected with valve gap 2 on the valve body 1, inboard, valve gap 2 lower end surface is provided with tapered slope 13 and spacing block face 14, be threaded into screw rod 3 on the valve gap 2, screw rod is connected to briquetting 43 times, have circular groove 5 on the screw rod 3, having on the screw rod hole wall on the briquetting 4 can the groove 6 corresponding with circular groove 5, screw rod 3 is assembled together with briquetting 4 by the ball silk back-up ring 7 that places the corresponding groove crack, the rotation of screw rod 3 can drive briquetting 4 thus and do, move down, briquetting 4 can adopt following scheme with connecting also of screw rod 3: establish circular groove on the screw rod, have two through holes on the upper screw hole wall of briquetting, thereby from through hole, snap in the interlock that spring card is realized briquetting and screw rod then.In the connecting part of valve gap 2 with valve body 1, adopt the diaphragm 8 of rubber fabric sandwich structure, its outer ring is pressed in the connecting part of valve body 1 and valve gap 2, and inner ring is fitted in briquetting 4 by gland nut 9 and two compress gaskets 10 that are threaded with briquetting 4.Said structure has guaranteed assembling place of screw rod 3 with valve gap 2, the sealing effect of the jointing of valve gap 2 and valve body 1.At the valve port place, have dovetail groove 11 on the end face of briquetting 4, be embedded with elastic seal ring 12 in the groove 11.When screw rod 3 promoted, seal ring 12 was in company with briquetting 4 actions, with valve port portion open from, liquid or gas are by the valve port place; Because screw rod 3 upwards promotes, diaphragm 8 is with rising or being adjacent on the tapered slope 13 of valve gap 2, and the upper-end surface of compress gasket 10 is also limited by the confined planes 14 of valve gap 2 simultaneously, to prevent that pressing from both sides fabric diaphragm 8 is drawn damage by unconfined lifting.As long as it is can be diaphragm pressure break (general water valve and air valve, working pressure generally can not surpass 1MPa) that the pressure of liquid by valve port or gas self is no more than 15MPa, the visible withstand voltage degree of the utility model is very high.When screw rod 3 descends, elasticity seal ring 12 in the briquetting 4 end face dovetail grooves 11 closely contacts with valve port, the sealing of formation Elastic Contact, liquid or gas are sealed, meanwhile pressure reduces in the briquetting 4 residing valve pockets, and folder fabric diaphragm 8 with falling, and leaves the tapered slope 13 of valve gap 2 with briquetting 4, the pressure that it bore is also low, thereby provides safe and reliable seal degree for the utility model.

Claims

1, a kind of non-leakage stopping valve, comprise that valve body (1), valve gap (2), screw rod (3) reach the briquetting (4) by bolt rod driving, it is characterized in that it also includes diaphragm (8), the described briquetting (4) that the screw rod Lift Part is sealed that are connected between valve wall and the briquetting and upward has elastomer seal (12) at the contacting part with valve port.

2, non-leakage stopping valve according to claim 1, it is characterized in that described diaphragm (8) accompanies the diaphragm of fabric for the mesosphere, the outer ring of diaphragm (8) is crimped between the connecting part of valve body (1) and valve gap (2), the inner ring of diaphragm (8) by the gland nut (9) that is threaded with briquetting (4) and place inner ring up and down both sides two compress gaskets (10) and be fitted in briquetting (4).

3,, it is characterized in that described valve gap (2) inboard, lower end surface is provided with tapered slope (13) and the compress gasket spacing block face (14) that rises as non-leakage stopping valve as described in the claim 2.

4, non-leakage stopping valve according to claim 1 is characterized in that the elastomer seal (12) on the described briquetting (4) is an elastic seal ring, has dovetail groove (11) on described briquetting (4) lower end surface, seal ring (12) and dovetail groove (11) scarf.

5, non-leakage stopping valve according to claim 1, it is characterized in that having on the described screw rod (3) circular groove (5), have on briquetting (4) the upper screw hole wall can be corresponding with screw rod circular groove (5) groove (6), the gap is built-in with ball silk back-up ring (7) between two grooves.