CN200946665Y

CN200946665Y - Corrugated pipe valve

Info

Publication number: CN200946665Y
Application number: CN 200620076422
Authority: CN
Inventors: 陈世修
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-09-08
Filing date: 2006-09-08
Publication date: 2007-09-12
Anticipated expiration: 2016-09-08

Abstract

The utility model discloses a corrugated pipe valve which adopts a corrugated pipe as the main sealing member of the valve stem. The utility model comprises a valve body, a valve cover, a valve flap, a valve stem and a hand wheel while the part of stem which is in the valve body is wrapped by a corrugated pipe. A radial boss is arranged on the lower end of the valve stem and the radial boss is integrated with the valve stem. The utility model is characterized in that an upper external sleeve and an upper internal sleeve are provided on the upper part of the valve stem, the upper external sleeve is in tight-coupling with the valve cover, the upper internal sleeve is in movable fitness with the valve stem and upper end of the corrugated pipe is hold by the upper external sleeve and the upper internal sleeve to be welded together. A lower external sleeve and a lower internal sleeve are provided on the part of valve stem which is on the radial boss, the outside diameter of the lower external sleeve is equal that of the radial boss, the lower external sleeve is tightly connected with the radial boss and the lower end of the corrugated pipe is held by the lower external sleeve and the lower internal sleeve to be welded together. The corrugated pipe valve has a higher strength at the joints at both ends of the corrugated pipe to be less prone to breakage or leakage during the operation and can prevent damage to the corrugated pipe valve.

Description

Bellows valve

Technical field

The utility model relates to a kind of valve.Be to adopt the valve of bellows specifically, be applicable on the valve that pressure and sealability are had relatively high expectations as the main moving sealing element of valve rod.

Background technique

At present, adopt bellows mainly to form, be with bellows on interior that section valve rod of valve body by valve body, valve gap, flap, valve rod and handwheel as the valve of the main moving sealing element of valve rod, the two ends of bellows respectively with valve rod and valve gap sealing-in mutually.When valve rod was done axial motion, bellows was stretched or compressed, and at this moment, the inner chamber of bellows communicates with atmosphere, and its outer wall then contacts, bears pressure medium with working medium, thereby formed motive sealing.Wherein, the sealing-in of bellows two ends and valve rod and valve gap is achieved in that promptly at the inboard center of valve gap and valve rod processes axial inner convex platform and boss radially respectively near flap one end, the two ends of bellows are enclosed within this axial inner convex platform respectively and radially on the boss, and by welding manner with the two ends of bellows respectively with axial inner convex platform and radially boss weld together.Because the two ends of bellows are enclosed within on the axial inner convex platform of valve gap respectively and on the radially boss of valve rod, during welding, can only radially weld from the interface of bellows.And the thinner thickness of bellows interface, have only 0.15mm usually, and its thermal capacity is minimum, and warming velocity is very fast in the welding process, tends to produce burning.And valve rod is the entity metal, its thermal capacity is higher, be several 10 times of bellows, in welding process warming velocity slowly, the local thawing only, it mainly is to melt metal certainly on the bellows with the molten metal of joint that bellows forms, and makes that the intensity of bellows two ends jointing is very low.Because the molten metal of locating bellows two end connectors mainly is the molten certainly metal on the bellows, intensity is very low, very easily occurs breaking in the using process with after medium contacts, leakage phenomenon, thereby causes the damage of whole Bellows valve.In addition, for improving the bearing capacity of Bellows valve, just must increase the number of plies of bellows.But still adopt conventional construction between the end of multiply bellows and valve rod, weld from their end, still can cause the burning of multilayer corrugated interface tube in the welding process, what really play the pressure-bearing effect is innermost that layer bellows, make that the number of plies of increase bellows is also not obvious to the bearing capacity effect that improves valve, be difficult to give play to the effect of multiply bellows.In the using process, still occur easily breaking, leakage phenomenon, cause the damage of whole Bellows valve.

The model utility content

Problem to be solved in the utility model provides a kind of Bellows valve.This Bellows valve, the intensity height of its joint, bellows two ends, be not prone in the using process break, leakage phenomenon, can avoid the damage of Bellows valve.

For addressing the above problem, take following technological scheme:

Bellows valve of the present utility model comprises valve body, valve gap, flap, valve rod and handwheel, is with bellows on that section valve rod in the valve body, the two ends of bellows respectively with valve rod and valve gap sealing-in mutually.Valve rod has radially boss near an end of flap, and radially boss and valve rod form as one for these.Be characterized in having on the valve rod near bellows upper end last overcoat and last in cover, last overcoat seals mutually with valve cover chamber, go up interior overlap with valve rod between be activity and cooperate.The upper end of bellows be clamped in overcoat and last in the cover between, and be between the three sealing shape weld together.Radially have on that section valve rod on the boss following overcoat and down in cover, the external diameter of following overcoat equates with the external diameter of boss radially and the two is and seals shape and link together.The bellows lower end be clamped in down overcoat and down between the cover, and be the sealing shape between the three and weld together.

Take such scheme, have the following advantages:

Since the valve rod of the utility model bellows upper end be provided with overcoat and in cover, the upper end of bellows be clamped in overcoat with last in overlap between, and be between the three and seal shape and weld together.Radially the valve rod on the boss be provided with down overcoat and down in cover, the bellows lower end be clamped in down overcoat with down in overlap between, and be between the three and seal shape and weld together.Not only the bellows two ends be clamped in respectively overcoat and last between the cover and following overcoat with down between the cover, form " three-ply board; and can be; the electric arc of welding gun is from the top heating of " three-ply board " in the welding process; three even fusions of part while; can form spherical enhancing joint, make the intensity of joint improve greatly from the axial welding of bellows.Because the intensity height of joint, be not prone in the using process break, leakage phenomenon, thereby avoided the damage of Bellows valve.

Again since the valve rod of bellows upper end be provided with overcoat and in cover, radially the valve rod on the boss be provided with down overcoat and down in overlap.If be bearing capacity, the employing multiply bellows of raising valve, the upper end of multiply bellows is clamped between overcoat and the last interior cover together, and their lower end is clamped in down between overcoat and interior down the overlapping, formation " multiply-plywood " structure.And can be from the axial welding of bellows, the electric arc of welding gun is from the top heating of " multiply-plywood " in the welding process, and a plurality of parts are evenly fusion simultaneously, can form spherical enhancing joint, makes the intensity of joint improve greatly.So, what really play the pressure-bearing effect is multiply bellows, makes that the number of plies of increase bellows is very obvious to the bearing capacity effect that improves valve, can give play to the effect of multiply bellows.

Description of drawings

Accompanying drawing is a Bellows valve structural representation of the present utility model.

Embodiment

As shown in drawings, Bellows valve of the present utility model includes valve body 1, valve gap 5, flap 2, valve rod 3 and handwheel 10.Flap 2 wherein is fixed on the inner end of valve rod 3, and it matches with valve port.Be processed with center hole on the valve gap 5, the upper end of valve rod 3 by stuffing box packing 6 and pressing plate 7 be the sealing shape, moving type stretches out outside valve gap 5.Be provided with support 8 on the valve gap 5, the lower end of this support is fixed on the upper side of valve gap 5, also is processed with center hole on it, and this center hole is corresponding with the center hole on the valve gap 5, and valve rod 3 upper ends pass outside support 8 upper ends from this center hole.Valve rod 3 upper ends are processed with screw thread and are furnished with nut 9, and said handwheel 10 is fixed on this nut.By rotation hand wheel 10, can drive nut 9 rotations and make valve rod 3 upper and lower motions, thus closing and opening between the flap 2 of realization valve rod 3 inner ends and valve port.

Chimb outside the connecting end outside of valve body 1 and valve gap 5 all is processed with radially, this two radially the evagination side weld be connected together.

Promptly the end near flap 2 is processed with radially boss in the inner of valve rod 3, and radially boss and valve rod 3 form as one for these.Be with bellows 14 on that section valve rod 3 in valve body 1, be with overcoat 13 and last interior cover 11 on the valve rod 3 of bellows 14 upper ends.Last overcoat 13 wherein is a cylinder, and its upper end is processed with radially inner convex platform, is processed with circumferential outer lug boss on its outer side surface.Correspondingly, inboard in valve body 1 and valve gap 5 joints is processed with circumferential step respectively, between the circumferential outer lug boss downside between the circumferential outer lug boss upper side on the last overcoat 13 and the circumferential step of valve gap 5 inboards, on the last overcoat 13 and the circumferential step of valve body 1 inboard gasket seal 12 is arranged all, by the valve body 1 and the outside of valve gap 5 connecting ends are welded and the sealing pad, make between the inner side surface of overcoat 13 and valve body 1 and valve gap 5 to seal mutually.

Cover 11 was for annulus in institute said, and it is moving type and is enclosed within on the valve rod 3, and the radially inner convex platform inside edge upside of its outer edge upside and last overcoat 13 all is processed with axially goes up chimb.The upper end of bellows 14 be clamped in overcoat 13 and last between the cover 11, and the upper end that makes bellows 14 and this diaxon chimb that makes progress is concordant, makes to be between them by the concordant end welding to them to seal shape and weld together.

Valve rod 3 lower ends promptly radially have on that section valve rod 3 on the boss following overcoat 15 and down in cover 4.The upper end of following overcoat 15 also is processed with radially inner convex platform, this radially inner convex platform the inside edge and down in all be processed with axially chimb down on the outer edge of cover 4, the lower end of bellows 14 be clamped in down overcoat 15 with down between the cover 4 and concordant with the downward chimb of this diaxon, make by concordant end welding to be the sealing shape between them and to weld together to them.

The outside, lower end of following overcoat 15 and the radially boss outer edge upside of valve rod 3 the inners all are processed with radially outer chimb, this two radially outer chimb is concordant, by welding will make down radially being between the boss of the lower end of overcoat 15 and valve rod 3 inner ends seal shape to link together to concordant end.

Claims

1. Bellows valve comprises valve body (1), valve gap (5), flap (2), valve rod (3) and handwheel (10), is with bellows (14) on that section valve rod (3) in the valve body (1), the two ends of bellows (14) respectively with valve rod (3) and valve gap (5) sealing-in mutually; Valve rod (3) has radially boss near an end of flap (2), and radially boss and valve rod (3) form as one for these; It is characterized in that having on the valve rod (3) near bellows (14) upper end last overcoat (13) and last in cover (11), sealing mutually between last overcoat (13) and valve gap (5), upward interior overlapping is activity between (11) and valve rod (3) and cooperates; The upper end of bellows (14) be clamped in overcoat (13) and last in the cover (11) between, and be between the three sealing shape weld together; Radially have on that section valve rod (3) on the boss following overcoat (15) and down in cover (4), the external diameter of following overcoat (15) equates with the external diameter of boss radially and the two is and seals shape and link together; Bellows (14) lower end be clamped in down overcoat (15) and down between the cover (4), and be the sealing shape between the three and weld together.

2. Bellows valve according to claim 1, there is radially inner convex platform the upper end that it is characterized in that overcoat (13), radially on the outer edge of the inside edge of inner convex platform and last interior cover (11) a last chimb is arranged all, the upper end of bellows (14) and this diaxon chimb that makes progress is concordant, and triangular seal weld contact is on their the concordant end.

3. Bellows valve according to claim 1, it is characterized in that also there is radially inner convex platform the upper end of overcoat (15) down, this radially inner convex platform the inside edge and down in chimb is down all arranged axially on the outer edge of cover (4), the lower end of bellows (14) is concordant with the downward chimb of this diaxon, and triangular seal weld contact is on their the concordant end.

4. Bellows valve according to claim 3, the radially boss outer edge upside under it is characterized in that on the outside, the lower end of overcoat (15) and the valve rod (3) all has radially outer chimb, and this two radially outer chimb is the sealing shape and welds together.

5. Bellows valve according to claim 5 is characterized in that all there is radially outer chimb in valve body (1) and valve gap (5) the connecting end outside, this two radially the evagination side weld be connected together.

6. according to claim 1,2,3,4 or 5 described Bellows valves, it is characterized in that on the outer side surface of overcoat (13) circumferential outer lug boss being arranged, valve body (1) has circumferential step respectively with the inboard of valve gap (5) joint, between the circumferential step of circumferential outer lug boss upper side on the last overcoat (13) and valve gap (5) inboard, between the circumferential step of circumferential outer lug boss downside on the last overcoat (13) and valve body (1) inboard gasket seal (12) is arranged all, weld and the sealing pad by the outside, make between the inner side surface of overcoat (13) and valve body (1) and valve gap (5) to seal mutually valve body (1) and valve gap (5) connecting end.