CN2890528Y

CN2890528Y - Self-sealing double-flat-plate gate valve

Info

Publication number: CN2890528Y
Application number: CN 200620008372
Authority: CN
Inventors: 胡金木
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-03-20
Filing date: 2006-03-20
Publication date: 2007-04-18
Anticipated expiration: 2016-03-20

Abstract

The utility model discloses a self-sealing double-flat-plate gate valve which comprises a valve body, a valve cap, an operation screw and a hand-wheel on the valve cap; the valve body is provided with a damper plate unit interacting with the operation screw, and provided with a sealing face matching with the damper plate in the damper plate unit; the damper plate unit comprises two separated damper plates and a central push rod, the two damper plates are arranged in opposite way while the outer sealing faces on the two damper plates are parallel with each other, certain numbers of dish spring are arranged on the inside the faces of the two damper plates; the central push rod is arranged between the two damper plates by the lower end and a slot which can match the lower end and arranged inside the two damper plates; the upper end of the central push rod is connected with the operation screw through the connector; with the driven force by the operation screw, the lower end of the central push rod can bring the two damper plates to move in up-down parallel manner along the sealing face of the valve body, the dish spring can make the outer sealing face of the two damper plates to compress on the sealing face of the valve body at all time wherein the sealing effect can be maintained and lifecycle can be elongated.

Description

Self-sealing gate valve with double flat shutter board

Technical field

The utility model relates to a kind of valve.

Background technique

In industries such as chemical industry, oil, rock gas, power plant, colliery, building, sewage treatment and light industry; the flashboard of gate valve commonly used is an one; and flashboard is up big and down small wedge shape; not only processing inconvenience; and owing to often have hard particles or other dirts in the ducted liquid medium; these dirts remain on the sealing surface of valve body; sealing surface is scratched; make the sealing effect variation and cause internal leakage; cause shorten greatly the working life of flashboard, and the normal wear of sealing surface can cause internal leakage owing to compensating also.

The model utility content

At the problems referred to above, the purpose of this utility model is to provide a kind of normal wear, zero leakage, the self-sealing gate valve with double flat shutter board of long service life that can the automatic compensation sealing face.

For achieving the above object, technical solution of the present utility model is:

A kind of self-sealing gate valve with double flat shutter board, comprise valve body, valve gap, the valve gap that is positioned at the top is provided with operation screw rod and operation handwheel, be provided with and operate the guillotine mechanism of screw rod interlock in the valve body, be provided with the sealing surface that matches with flashboard in the guillotine mechanism in the valve body, described guillotine mechanism comprises two flashboard and center push rod of separating mutually, two flashboards are oppositely arranged, its outside sealing surface is parallel to each other, two flashboards are evenly equipped with several stage clips on the inboard surface, center push rod by the inboard draw-in groove that be provided with and that this lower end is complementary of its lower end and two flashboards by spiral-lock between two flashboards, the center push rod upper end links to each other with described operation screw rod by its connecting head, under the operation bolt rod driving, center push rod can drive two flashboards by its lower end and move along the sealing surface on the described valve body is parallel up and down, and described stage clip is pressed on the sealing surface of valve body two flashboards outside sealing surface all the time.

Further, described two valve plates are provided with the breach that passes for the intermediate neck between center push rod upper end connecting head and its lower end, the shape of this breach and the neck shaped of center push rod are complementary, the center push rod lower end is provided with can be with two valve plates along the pushing tow face of its horizontal axis to the pushing of two outsides when the center push rod is descending, two valve plates are provided with described pushing tow face corresponding pressured, are provided with between center push rod lower end and two valve plates to make two valve plates with the up interface arrangment of center push rod.

Further, described center push rod lower end is the symmetric wedge head of relative its vertical axis, described two valve plate inboards are provided with the wedge-shaped impression that is complementary with the center push rod sphenocephaly, described sphenocephaly upper-end surface size is greater than the sectional dimension of center push rod neck, the Ka Tai that the projection of its relative neck and described wedge-shaped impression upper end are provided with constitutes described interface arrangment, and the Vertical direction size of described wedge-shaped impression is greater than the Vertical direction size of described sphenocephaly.

Further, described center push rod is provided with the pressured device of the elasticity that described interface arrangment is pressed over all the time between described two flashboards.

Further, the pressured device of described elasticity is a stage clip, and this stage clip is arranged on described center push rod lower end bottom surface and described two flashboards between the wedge-shaped impression bottom surface, or is arranged between described center push rod upper end connecting head lower surface and the described two flashboard upper-end surfaces.

Further, as self-sealing gate valve with double flat shutter board as described in the claim 5, it is characterized in that, on the outside sealing surface of described two flashboards all at interval built-up welding two ring-type hard alloy abrasion-resistant layer are arranged, be filled with elastic sealing layer between this two ring-types hard alloy abrasion-resistant layer, the radial outside edge of the belt sealing surface upper semi-circle of the radial outside edge of described outside ring-type hard alloy abrasion-resistant layer or both sides of the edge and described valve body and the radially inboard edge of lower semi-circle are horn structure, constitute shearing edge by described horn structure between described two flashboards and described valve body.

Further, described valve body inner bottom part is provided with described two flashboard lower dead center thrust structures, and this thrust structure is limited post or the thrust surface directly made by valve body; Be provided with dust ring near its inboard radial edges place between described two flashboards, be provided with dust ring with the corresponding indentation, there of described center push rod neck on described two flashboards.

Further, described center push rod sphenocephaly is provided with at least one horizontal through hole, be provided with at least two balls in the through hole, the outer surface of two balls all protrudes the inclined-plane, both sides of sphenocephaly, and center push rod pushes two flashboards by described ball respectively to the two flashboard substantially horizontals outside.

Further, described center push rod is positioned on the geometric centroid of each flashboard by the power that the ball on its sphenocephaly is applied on described each flashboard.

Further, on the inboard wedge-shaped impression of described two flashboards with described center push rod sphenocephaly on the ball corresponding section be provided with wear-resistant pad, the angle of this wear-resistant pad surface and Vertical direction is greater than described ball self-locking friction angle thereon.

After adopting said structure, because described guillotine mechanism comprises two flashboard and center push rod of separating mutually, two flashboards are oppositely arranged, its outside sealing surface is parallel to each other, two flashboards are evenly equipped with several stage clips on the inboard surface, center push rod by the inboard draw-in groove that be provided with and that this lower end is complementary of its lower end and two flashboards by spiral-lock between two flashboards, center push rod can drive two flashboards by its lower end and move along the sealing surface on the described valve body is parallel up and down, and in the process of moving up and down, under the stage clip effect, two flashboards outside sealing surface is pressed on the sealing surface of valve body all the time, when sealing surface has wearing and tearing, but the normal wear amount of automatic compensation sealing face, and in seal process, it is downward that center push rod not only promotes flashboard, also flashboard separated to both sides simultaneously, makes two flashboards be fitted on the valve body respectively, even flashboard or sealing surface have normal wear, flashboard and valve body also can be fitted closely, guarantee that sealing effect is good, reach zero leakage and increase the service life; In addition, because the outside sealing surface of described two flashboards is for going in ring, be somebody's turn to do to pile on the sealing surface that goes in ring and be provided with hard alloy abrasion-resistant layer, the radial outside edge of the radial outside edge of the belt sealing surface of two flashboards or both sides of the edge and the belt sealing surface upper semi-circle of described valve body and the radially inboard edge of lower semi-circle are horn structure, between described two flashboards and described valve body, constitute shearing edge by described horn structure, therefore the residual soil on the scraped sealing surface in seal process, avoid in the seal process particulate matter in the pipeline wash away and residual soil scratches sealing surface and causes internal leakage, and hard wear-resistant layer more can prolong its working life; In addition, because the lower end of center push rod is the symmetric wedge head of relative its vertical axis, be provided with cavity in the sphenocephaly, be provided with two balls in the cavity, the wedge-shaped impression pushing tow face of flashboard is provided with the less wear-resistant pad of friction factor, the angle of this wear-resistant pad surface and Vertical direction is greater than described ball self-locking friction angle thereon, contact with wear-resistant pad by two balls, switch valve very easily, the switch moment of this plate valve of evidence only is that bore is identical, / 3rd of a common valve that pressure rating is identical, and avoided the phenomenon that center push rod is not extremely opened by wedge when temperature variation is very big, make the gate valve flexible operation and increase the service life, in addition, described center push rod is positioned on the geometric centroid of each flashboard by the power that the ball on its sphenocephaly is applied on described each flashboard, thereby makes two flashboards stressed evenly; In addition, between two flashboards, be provided with dust ring near its inboard radial edges place, be provided with dust ring with the corresponding indentation, there of described center push rod neck on described two flashboards, can prevent that dust or other dirts from immersing between two flashboards, guarantee that plate valve can be malfunctioning because of the dirt intrusion.

Description of drawings

Fig. 1 is the utility model embodiment 1 a structural drawing;

Fig. 2 is the structural drawing of guillotine mechanism;

Fig. 3 is the plan view of center push rod;

Fig. 4 is the side view of center push rod;

Fig. 5 is the sectional drawing of flashboard;

Fig. 6 is the side view of flashboard;

Fig. 7 is the structural drawing of embodiment 2 guillotine mechanism.

Embodiment:

Specify the utility model below in conjunction with accompanying drawing:

As Fig. 1, shown in 2, the utility model self-sealing gate valve with double flat shutter board comprises valve body 1, valve gap 2, the valve gap 2 that is positioned at the top is provided with operation screw rod 3 and operation handwheel 4, be provided with and operate the guillotine mechanism of screw rod 3 interlocks in the valve body 1, be provided with the sealing surface that matches with flashboard in the guillotine mechanism in the valve body 1, this guillotine mechanism comprises center push rod 5, two flashboards 6 that are provided with relatively, as Fig. 3, shown in 4, this center push rod 5 comprises upper end connecting head 51, neck 52 and wedge shape lower end 53, upper end connecting head 51 is provided with and is used for operating the draw-in groove 511 that screw rod 3 fixes mutually, described lower end 53 is the symmetric wedge head of relative its vertical axis, and be provided with a horizontal through hole 531 in the lower end 53, be provided with two balls 532 in the through hole 531, the outer side of two balls 532 is all protruded the both sides hypotenuse of wedge shape lower end 53, and center push rod 5 pushes two flashboards by described ball 532 respectively to two flashboards, the 6 substantially horizontals outside; Described sphenocephaly upper-end surface size is greater than the sectional dimension of center push rod neck 52, as Fig. 5, shown in 6, two flashboards 6 are circular dull and stereotyped, its outside sealing surface is parallel to each other, be equipped with breach 61 that the neck 52 with center push rod 5 is complementary and the wedge-shaped impression 62 that is complementary with lower end 53 on the two circular dull and stereotyped opposing sides, two flashboards, 6 center push rod 5 outsides that are enclosed within staggered relatively, lower end 53 is placed in the wedge-shaped impression 62 of two flashboards 6, and leave spacing between the pushing tow face of the inclined-plane, both sides of lower end 53 and the wedge-shaped impression 62 of two flashboards 6, the outer side of two balls 532 is resisted against on the pushing tow face of wedge-shaped impression 62, the card platform 621 that the projection of described lower end 53 relative necks 52 and described wedge-shaped impression 62 upper ends are provided with constitutes interface arrangment, the Vertical direction size of described wedge-shaped impression 62 is greater than the Vertical direction size of described wedge shape lower end 53, and center push rod 5 can drive two flashboards 6 by its lower end and move along the sealing surface on the described valve body 1 is parallel up and down; There are the some groups of grooves that are connected in axially equal portion on the opposing side of two flashboards 6, is provided with stage clip 7 in the groove, and this stage clip 7 is pressed on the sealing surface of valve body 1 outside sealing surface of two flashboards 6 all the time.Center push rod 5 is provided with the pressured device of the elasticity that above-mentioned interface arrangment is pressed over all the time between described two flashboards 6, the pressured device of this elasticity is a stage clip, this stage clip is arranged on center push rod 5 lower ends, 53 bottom surfaces and described two flashboards 6 between wedge-shaped impression 62 bottom surfaces, or as shown in Figure 7, be arranged between described center push rod 5 upper end connecting heads, 51 lower surfaces and described two flashboards 6 upper-end surfaces.

The lower end of described center push rod also can be made as bulb, the bulb diameter is greater than the recess diameter of center push rod, then be provided with and the corresponding up big and down small conical socket of bulb shape on the opposing side of two flashboards, the bulb of center push rod is resisted against on the pushing tow face of groove, two valve plates can be pushed to two outsides along its horizontal axis when center push rod is descending, drive flashboard when up and move upward.

In use, making screw rod 2 drive center push rod 5 by operation handwheel 4 moves downward, because the elasticity of spring 8 is enough big, therefore center push rod moves downward by spring 8 promotion flashboards 6, two outside sealing surfaces of flashboard 6 are fitted on the sealing surface of valve body 1, owing to be provided with stage clip 7 between two flashboards, under the thrust of stage clip 7, two flashboards, two outside sealing surfaces in moving downward process fit tightly all the time on the sealing surface of valve body, when sealing surface has wearing and tearing, but the normal wear amount of automatic compensation sealing face; Be provided with described two flashboards, 6 lower dead center thrust structures 9 at valve body 1 inner bottom part in addition, this thrust structure 9 is limited post or the thrust surface directly made by valve body 1, stop motion when flashboard 6 arrives thrust structures 9 positions downwards; At this moment center push rod 5 continues to move downward, pressure spring 8, the pushing tow face of the wedge-shaped impression of center push rod 5 relative flashboards 6 slides, and two balls 532 strut two flashboards 6 by pushing tow towards both sides fit two outside sealing surfaces of two flashboards 6 and the sealing surface of valve body 1, makes valve closing; For making the gate valve flexible operation and increasing the service life, on described two flashboards, the 6 inboard wedge-shaped impressions with described center push rod 5 sphenocephalies on ball 532 corresponding sections be provided with wear-resistant pad 63, the angle of this wear-resistant pad surface and Vertical direction is greater than described ball self-locking friction angle thereon, ball 532 is located at the geometrical center of wear-resistant pad 63, and the power that ball is applied on described each flashboard is positioned on the geometric centroid of each flashboard; In addition, the interval built-up welding has two ring-type hard alloy abrasion-resistant layer 64 on the outside sealing surface of two flashboards 6, be filled with teflon seal layer 67 between this two ring-types hard alloy abrasion-resistant layer 64, sealing layer 67 also can be selected other elastic materials such as nylon or rubber for use, the radial outside edge of the radial outside edge of described outside ring-type hard alloy abrasion-resistant layer 64 or both sides of the edge and described valve body 1 belt sealing surface upper semi-circle and the radially inboard edge of lower semi-circle are horn structure, this wedge angle can be 100 °, 90 ° or 80 °, between two flashboards 6 and valve body 1, constitute shearing edge by described horn structure, in seal process, can scrape the residual soil on the most valve body sealing surface, solved thoroughly that particle in the pipeline washes away and residual soil scratches sealing surface and caused the problem of internal leakage, the setting of sealing layer 67 then makes the whole valve body sealability better; After cancelling power downward on the screw rod 2, spring 8 sets back, the wedge shape lower end 53 of center push rod 5 promptly along the wedge-shaped impression pushing tow of flashboard 6 towards last slip, and under the effect of spring 8, the interface arrangment that the card platform 621 that the projection of lower end 53 relative necks 52 and described wedge-shaped impression 62 upper ends are provided with constitutes is abutted together all the time, by screw rod 2 center push rod 5 is moved upward, center push rod 5 drives two flashboards 6 by interface arrangment and moves upward valve open.In addition, immerse between two flashboards, on described two flashboards 6, be provided with dust ring 65 with the corresponding indentation, there of described center push rod 5 necks for preventing dust or other dirts.For preventing that further the pipeline medium from entering in the valve, also be provided with dust ring 66 near its inboard radial edges place between two flashboards 6.

Claims

1, a kind of self-sealing gate valve with double flat shutter board, comprise valve body, valve gap, the valve gap that is positioned at the top is provided with operation screw rod and operation handwheel, be provided with and operate the guillotine mechanism of screw rod interlock in the valve body, be provided with the sealing surface that matches with flashboard in the guillotine mechanism in the valve body, it is characterized in that, described guillotine mechanism comprises two flashboard and center push rod of separating mutually, two flashboards are oppositely arranged, its outside sealing surface is parallel to each other, two flashboards are evenly equipped with several stage clips on the inboard surface, center push rod by the inboard draw-in groove that be provided with and that this lower end is complementary of its lower end and two flashboards by spiral-lock between two flashboards, the center push rod upper end links to each other with described operation screw rod by its connecting head, under the operation bolt rod driving, center push rod can drive two flashboards by its lower end and move along the sealing surface on the described valve body is parallel up and down, and described stage clip is pressed on the sealing surface of valve body two flashboards outside sealing surface all the time.

2, self-sealing gate valve with double flat shutter board according to claim 1, it is characterized in that, described two valve plates are provided with the breach that passes for the intermediate neck between center push rod upper end connecting head and its lower end, the shape of this breach and the neck shaped of center push rod are complementary, the center push rod lower end is provided with can be with two valve plates along the pushing tow face of its horizontal axis to the pushing of two outsides when the center push rod is descending, two valve plates are provided with described pushing tow face corresponding pressured, are provided with between center push rod lower end and two valve plates to make two valve plates with the up interface arrangment of center push rod.

3, as self-sealing gate valve with double flat shutter board as described in the claim 2, it is characterized in that, described center push rod lower end is the symmetric wedge head of relative its vertical axis, described two valve plate inboards are provided with the wedge-shaped impression that is complementary with the center push rod sphenocephaly, described sphenocephaly upper-end surface size is greater than the sectional dimension of center push rod neck, the Ka Tai that the projection of its relative neck and described wedge-shaped impression upper end are provided with constitutes described interface arrangment, and the Vertical direction size of described wedge-shaped impression is greater than the Vertical direction size of described sphenocephaly.

4, as self-sealing gate valve with double flat shutter board as described in claim 1 or 2 or 3, it is characterized in that described center push rod is provided with the pressured device of the elasticity that described interface arrangment is pressed over all the time between described two flashboards.

5, as self-sealing gate valve with double flat shutter board as described in the claim 4, it is characterized in that, the pressured device of described elasticity is a stage clip, this stage clip is arranged on described center push rod lower end bottom surface and described two flashboards between the wedge-shaped impression bottom surface, or is arranged between described center push rod upper end connecting head lower surface and the described two flashboard upper-end surfaces.

6, as self-sealing gate valve with double flat shutter board as described in the claim 5, it is characterized in that, on the outside sealing surface of described two flashboards all at interval built-up welding two ring-type hard alloy abrasion-resistant layer are arranged, be filled with elastic sealing layer between this two ring-types hard alloy abrasion-resistant layer, the radial outside edge of the belt sealing surface upper semi-circle of the radial outside edge of described outside ring-type hard alloy abrasion-resistant layer or both sides of the edge and described valve body and the radially inboard edge of lower semi-circle are horn structure, constitute shearing edge by described horn structure between described two flashboards and described valve body.

7, as self-sealing gate valve with double flat shutter board as described in the claim 6, it is characterized in that described valve body inner bottom part is provided with described two flashboard lower dead center thrust structures, this thrust structure is limited post or the thrust surface directly made by valve body; Be provided with dust ring near its inboard radial edges place between described two flashboards, be provided with dust ring with the corresponding indentation, there of described center push rod neck on described two flashboards.

8, as self-sealing gate valve with double flat shutter board as described in the claim 7, it is characterized in that, described center push rod sphenocephaly is provided with at least one horizontal through hole, be provided with at least two balls in the through hole, the outer surface of two balls all protrudes the inclined-plane, both sides of sphenocephaly, and center push rod pushes two flashboards by described ball respectively to the two flashboard substantially horizontals outside.

9, as self-sealing gate valve with double flat shutter board as described in the claim 8, it is characterized in that described center push rod is positioned on the geometric centroid of each flashboard by the power that the ball on its sphenocephaly is applied on described each flashboard.

10, as self-sealing gate valve with double flat shutter board as described in the claim 9, it is characterized in that, on the inboard wedge-shaped impression of described two flashboards with described center push rod sphenocephaly on the ball corresponding section be provided with wear-resistant pad, the angle of this wear-resistant pad surface and Vertical direction is greater than described ball self-locking friction angle thereon.