CN115560087A

CN115560087A - Self-pressure-relief bellows sealing double-gate-plate gate valve

Info

Publication number: CN115560087A
Application number: CN202211253345.9A
Authority: CN
Inventors: 唐首富; 粟飞; 潘益茅; 钟家富; 杨亮; 宋吉利; 骆群华
Original assignee: Zhejiang Zhongde Automatic Control Valve Co ltd
Current assignee: Zhejiang Zhongde Automatic Control Valve Co ltd
Priority date: 2022-10-13
Filing date: 2022-10-13
Publication date: 2023-01-03

Abstract

The invention relates to the technical field of double-flashboard gate valve structures, in particular to a self-pressure-relief bellows sealing double-flashboard gate valve which comprises a valve seat, a valve rod and a flashboard, wherein a through hole for medium circulation is formed in the valve seat, the valve rod penetrates through the valve seat and drives the flashboard to lift and fall for opening and closing the through hole, the flashboard is arranged in a double-flashboard mode and comprises sealing plates which are symmetrically arranged, a self-pressure-relief mechanism is arranged at the position, in the arrangement direction of the through hole, of the connecting position of the flashboard with a floating regulating quantity and the valve rod, of each sealing plate, the self-pressure-relief mechanism is used for extruding the sealing plates on two sides to enable the sealing plates to be respectively abutted against and sealed with a medium inlet end and a medium outlet end of the through hole, the ejector rod is matched with a wedge block, the sealing plates are enabled to be abutted against and sealed with the medium inlet end on the valve seat, and the sealing plates can better withstand the pressure action of the medium due to the abutting action of the ejector rod.

Description

Self-pressure-relief bellows sealing double-gate-plate gate valve

Technical Field

The invention relates to the technical field of double-gate valve structures, in particular to a self-pressure-relief bellows sealing double-gate valve.

Background

The parallel double-gate valve has the characteristics of good sealing performance, small opening and closing moment, long service life and the like due to the structural particularity, and is increasingly applied to the industries of petroleum, chemical engineering, light industry and the like.

The thrust of the valve rod of the parallel double-gate-plate gate valve is transmitted to the gate plate through component force of parts in the valve, so that the gate plate and the valve seat are automatically extruded to form forced sealing. However, in some special cases where the temperature difference of the medium is changed greatly or the temperature of the external environment is changed greatly, it may take several hours to open the valve after the valve is closed at a low temperature. Because the valve cavity is filled with the medium, such as the temperature of the medium rises or the outside temperature rises in the closing process of the valve, at the moment, because the valve is in a sealing state, the medium in the valve cavity expands along with the temperature rise, the pressure in the valve cavity rises abnormally, and the sealing specific pressure of the flashboard and the valve seat is overlarge. A greater driving force is then required to open the valve. In such a case, the valve is often unable to open, and even the valve sealing surface or the valve body is damaged.

In addition, the gate at the medium inlet end is subjected to the pressure acted on by the medium, so that the gate at the side is easy to have the conditions of poor sealing and leakage.

The applicant discloses a valve core assembly on a gate valve in Chinese patent with the patent application number of 201620961540.0 applied on 2016, 08 and 29, wherein the valve core assembly is arranged in a valve cavity between a medium inlet channel and a medium outlet channel and comprises a wedge-shaped block, an expansion block, two sealing discs and two guide frames, and the two sealing discs are arranged in parallel; the guide frames are arranged on the valve body above the sealing disc, and a guide rail for guiding the sealing disc is formed between the two guide frames; the wedge-shaped block is connected to the inner end part of the valve rod, a positioning shaft hole parallel to the medium flow channel is formed in the sealing disc, a positioning shaft is arranged on the side surface of the inner end of the sealing disc, and the positioning shaft is arranged in the positioning shaft hole; the expansion block is positioned between the wedge block and the sealing disc, the lower end part of the expansion block is abutted against the inner end face of the valve body, the expansion block is hung on the wedge block, and the wedge block is abutted against the inclined face of the expansion block in a matching manner.

However, according to the reaction of the applicant, when the above technical solution is used, due to the temperature difference, the pressure inside the valve chamber is easily abnormally increased, so that the specific pressure of the gate and the valve seat is too high. And a larger driving force is needed to open the valve.

Disclosure of Invention

Aiming at the problems, the invention provides a self-pressure-relief bellows sealing double-gate valve, wherein a sealing plate is driven to move by a mandril through the matching of the mandril and a wedge block, so that the sealing plate is abutted against and sealed with a medium inlet end on a valve seat, the sealing plate can better resist the pressure action of a medium due to the jacking action of the mandril, and the sealing plate is provided with a pressure relief hole.

In order to achieve the purpose, the invention provides the following technical scheme:

a self-pressure-relief bellows sealing double-gate-plate gate valve comprises a valve seat, a valve rod and a gate plate, wherein a through hole for circulating a medium is formed in the valve seat, the valve rod penetrates through the valve seat to drive the gate plate to lift and set for opening and closing the through hole, the gate plate is arranged in a double-gate-plate mode and comprises sealing plates which are symmetrically arranged, and floating adjustment amount is provided for the sealing plates along the arrangement direction of the through hole;

the connection position of the flashboard and the valve rod is provided with a self-pressure relief mechanism, and the self-pressure relief mechanism is used for extruding the sealing plate at two sides so that the sealing plate is respectively abutted against and sealed with the medium inlet end and the medium outlet end of the through hole;

the self-pressure-relief mechanism comprises ejector rods and wedge blocks, the ejector rods are arranged between the two groups of sealing plates, guide holes are formed in the ejector rods in an inclined mode, the wedge blocks are installed at the lower end portions of the valve rods, and the wedge blocks penetrate through the guide holes;

when the valve rod drives the flashboard to descend, the wedge block is in staggered fit with the guide hole, the ejector rod is extruded to move towards the medium inlet end, and the corresponding sealing plate is abutted against the medium inlet end to be in sealing fit with the medium inlet end.

As an improvement, the top of the wedge block is connected with the bottom of the valve rod in a penetrating and matching manner;

the top of voussoir is provided with the fixture block, the bottom of valve rod is provided with the draw-in groove, the fixture block with the draw-in groove interlude cooperation sets up, realizes the quick installation cooperation of voussoir and valve rod.

As an improvement, the guide hole is obliquely arranged towards the medium outlet end, the bottom of the wedge block is arranged in an oblique block manner, and when the wedge block moves downwards, the wedge block is in extrusion fit with the inner side wall of the guide hole, so that the ejector rod moves towards the medium inlet end, and the sealing plate is tightly pushed towards the medium inlet end.

As an improvement, a pressure relief hole is formed in the position, opposite to the ejector rod, of the sealing plate at the medium inlet hole end;

when the wedge block moves downwards, the wedge block is in extrusion fit with the inner side wall of the guide hole, so that the ejector rod blocks the pressure relief hole while moving towards the medium inlet end;

when the wedge block moves upwards, the ejector rod loses the limit of the wedge block, the ejector rod resets, the pressure relief holes are communicated with two sides of the sealing plate to relieve the pressure of the flashboard, and the problem that the flashboard cannot be smoothly opened due to the fact that the sealing ratio is too high is solved.

As an improvement, a sealing ring correspondingly matched with the ejector rod is arranged at the top-level sealing position of the ejector rod and the pressure relief hole.

As an improvement, the self-pressure-relief mechanism further comprises a wedge block, and the wedge block is mounted at the lower end part of the valve rod;

one side of the sealing plate corresponding to the wedge-shaped block is provided with an expansion block matched with the wedge-shaped block, and the sealing plate moves to the corresponding side through the matching of the wedge-shaped block and the expansion block and is abutted and sealed with the medium inlet end and the medium outlet end which correspond to the sealing plate respectively.

As the improvement, the wedge is including being the extrusion piece that the wedge set up and being located the stopper of extrusion piece both sides, the extrusion piece is when the extrusion piece rises the piece, when utilizing stopper and rising piece to contradict, utilizes the stopper to carry on spacingly to the extrusion piece.

As an improvement, the wedge block is provided with a mounting hole for the ejector rod to pass through, the wedge block is further provided with a mounting groove for the wedge block to be mounted, and the wedge block are driven by the valve rod to move synchronously.

As an improvement, the top of the wedge-shaped block and the lower end part of the valve rod are arranged in a penetrating fit connection mode;

the top of wedge is provided with the block groove of type shape of protruding, the lower tip of valve rod is provided with the block piece that block groove corresponds the complex.

As an improvement, the outer side of the valve rod is coated with a corrugated pipe which is contracted and expanded along with the movement of the valve rod.

The invention has the beneficial effects that:

(1) According to the invention, the ejector rod is matched with the wedge block, and the ejector rod is utilized to drive the sealing plate to move, so that the sealing plate is in contact sealing with the medium inlet end on the valve seat;

(2) According to the double-gate-plate gate valve, the pressure relief holes are formed in the sealing plate, when the ejector rod tightly pushes the sealing plate, the pressure relief holes are closed, when the ejector rod returns, the pressure relief holes are opened and communicated with the two sides of the sealing plate, so that the pressure relief effect is achieved, the gate plate can be easily lifted, and the problem that the existing double-gate-plate gate valve cannot be smoothly opened due to the fact that the sealing ratio is too high is solved;

(3) The ejector rod, the wedge block and the wedge block are matched with each other, so that the wedge block and the wedge block are integrated together, the wedge block and the wedge block are driven by the valve rod to lift, the sealing plates of the flashboards are driven to float respectively to seal, meanwhile, the ejector rod is driven to move, the sealing plates are tightly ejected by the ejector rod, and the structure is very compact and stable;

(4) According to the invention, the corrugated pipe is coated on the outer side of the valve rod, and the corrugated pipe is used for coating, sealing and protecting the valve rod, so that impurities are prevented from entering a space between the valve rod and the valve seat to cause abrasion of the valve rod, and effective protection is realized.

In conclusion, the double-gate valve has the advantages of stable sealing, stable structure, good pressure relief effect and the like, and is particularly suitable for the technical field of double-gate valve structures.

Drawings

FIG. 1 is a schematic view of the present invention in partial cross section;

FIG. 2 is an enlarged view of the structure at A in FIG. 1;

FIG. 3 is a schematic side view of a wedge block according to the present invention;

FIG. 4 is a schematic view of a wedge-shaped block in front view;

FIG. 5 is a first schematic sectional view of the ejector pin of the present invention;

FIG. 6 is a schematic sectional view of the second embodiment of the guide rod of the present invention;

FIG. 7 is a schematic side view of the wedge of the present invention;

FIG. 8 is a schematic view of a valve stem configuration of the present invention;

FIG. 9 is a schematic view of the sealing plate structure of the present invention;

fig. 10 is a schematic view of a bellows structure of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The embodiment is as follows:

as shown in fig. 1 to 10, a from sealed double-gate valve of pressure release bellows, includes disk seat 1, valve rod 2 and flashboard 3, set up the through-hole 11 of circulation medium on the disk seat 1, valve rod 2 wears to locate on the disk seat 1, drive 3 lifts and sets up of flashboard for the switch through-hole 11, its characterized in that:

the gate plate 3 is arranged in a double gate plate mode and comprises sealing plates 31 which are symmetrically arranged, and floating adjustment amount is provided for the sealing plates 31 along the arrangement direction of the through hole 11;

a self-pressure-relief mechanism 4 is arranged at a connecting position of the flashboard 3 and the valve rod 2, and the self-pressure-relief mechanism 4 is used for extruding the sealing plate 31 from two sides so that the sealing plate 31 is respectively abutted against and sealed with the medium inlet end 111 and the medium outlet end 112 of the through hole 11;

the self-pressure-relief mechanism 4 comprises an ejector rod 41 and a wedge 42, the ejector rod 41 is arranged between the two sets of sealing plates 31, the ejector rod 41 is provided with a guide hole 411 which is obliquely arranged, the wedge 42 is arranged at the lower end part of the valve rod 2, and the wedge 42 is arranged in the guide hole 411 in a penetrating manner;

when the valve rod 2 drives the gate plate 3 to descend, the wedge block 42 is in staggered fit with the guide hole 411 to extrude the ejector rod 41 to move towards the medium inlet end 111 and push the corresponding sealing plate 31 to be in sealing fit with the medium inlet end 111.

Wherein, the top of the wedge block 42 is connected with the bottom of the valve rod 2 by inserting and matching;

a clamping block 421 is arranged at the top of the wedge 42, a clamping groove 21 is arranged at the bottom of the valve rod 2, and the clamping block 421 and the clamping groove 21 are arranged in a penetrating and matching manner.

Further, the guide hole 411 is obliquely arranged towards the medium outlet end 112, the bottom of the wedge 42 is arranged in an oblique block, and when the wedge 42 moves downwards, the wedge 42 is in press fit with the inner side wall of the guide hole 411, so that the ejector rod 41 moves towards the medium inlet end 111.

Furthermore, a pressure relief hole 311 is formed in the position, opposite to the ejector rod 41, of the sealing plate 31 at the medium inlet end 111;

when the wedge 42 moves downwards, the wedge 42 is in press fit with the inner side wall of the guide hole 411, so that the ejector rod 41 blocks the pressure relief hole 311 while the ejector rod 41 moves towards the medium inlet end 111;

when the wedge 42 moves upwards, the ejector rod 41 loses the limit of the wedge 42, the ejector rod 41 resets, and the pressure relief holes 311 are communicated with two sides of the sealing plate 31 to relieve the pressure of the flashboard 3.

In addition, a sealing ring 312 correspondingly matched with the ejector rod 41 is arranged at the top sealing position of the ejector rod 41 and the pressure relief hole 311.

It should be noted that, the valve seat 1 is further provided with a driving mechanism for driving the valve rod 2 to ascend and descend, the driving mechanism may be an electric mechanism or a manual mechanism, the driving mechanism is a conventional mechanism, and will not be described in detail herein, in operation, the driving mechanism drives the valve rod 2 to descend, the wedge block 43 mounted on the valve rod 2 descends along with the wedge block, and the two side walls of the wedge block 43 block the mounting protrusions protruding from the sealing plate 31, so that the sealing plate 31 descends along with the wedge block, seal the through hole 11 in the valve seat 1, so that the through hole 11 is sealed, and close the valve, during the descending process of the valve rod 2, the wedge block 42 cooperates with the corresponding guide hole to be extruded through an inclined plane, so that the ejector rod moves towards the medium inlet end 111 side, the sealing plate 31 is tightly pushed against the medium inlet end 111, and the ejector rod 41 aligns with the pressure relief hole 311 to seal and block the pressure relief hole, and when the valve is opened, the valve rod 2 is driven to be lifted by the driving mechanism, and when the valve is opened, the valve rod 42 is lifted, the ejector rod 41 loses the inclined plane extrusion of the wedge block 41 loses the pressure relief hole, so that the pressure relief hole is restored, so that the sealing plate 31 is opened, and the valve rod 31 is more easily opened, and the valve rod 11 is connected to be connected to the valve.

In a more preferred embodiment, the self-pressure-releasing mechanism 4 further comprises a wedge block 43, and the wedge block 43 is mounted at the lower end of the valve rod 2;

an expansion block 313 matched with the wedge-shaped block 43 is arranged on one side, corresponding to the wedge-shaped block 43, of the sealing plate 31, and through the matching of the wedge-shaped block 43 and the expansion block 313, the sealing plate 31 moves to the corresponding side and is in interference sealing with the corresponding medium inlet end 111 and the medium outlet end 112 respectively.

Further, the wedge block 43 includes a pressing block 433 disposed in a wedge shape and a limiting block 434 located at two sides of the pressing block 433.

In addition, when the valve is closed, the sealing plate 31 is matched with the expansion block 313 through the wedge block 43, so that the sealing plate 31 moves towards the corresponding side at the same time, the through hole 11 is sealed, and the wedge block 43 is driven by the valve rod 2 to lift.

In a preferred embodiment, the wedge block 43 is provided with an installation hole 435 for the push rod 41 to pass through, and the wedge block 43 is further provided with an installation groove 436 for the wedge block 42 to be installed.

Further, the top of the wedge-shaped block 43 and the lower end of the valve rod 2 are arranged in a penetrating fit connection manner;

the top of the wedge-shaped block 43 is provided with a convex-shaped engaging groove 437, and the lower end of the valve rod 2 is provided with an engaging block 22 correspondingly matched with the engaging groove 437.

The wedge 42 is installed in the installation groove 436 of the wedge 43, the wedge 42 and the wedge 43 move up and down in synchronization, and the wedge 42 is provided with an installation hole 435 for inserting the push rod 41, so that the wedge 42 does not interfere with the push rod 41.

As a preferred embodiment, the outside cladding of valve rod 2 has the bellows 23 that is the shrink expansion setting along with the valve rod 2 removes, utilizes bellows 23 to carry out sealed protection to valve rod 2, avoids medium impurity to enter into the cooperation space of valve rod and valve seat, and the result valve rod is worn and torn.

The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims

1. The utility model provides a from sealed double-disc gate valve of pressure release bellows, includes disk seat (1), valve rod (2) and flashboard (3), set up through-hole (11) of circulation medium on disk seat (1), valve rod (2) wear to locate on disk seat (1), drive flashboard (3) go up and down to set up, be used for the switch through-hole (11), its characterized in that:

the gate plates (3) are arranged in a double-gate plate mode and comprise sealing plates (31) which are symmetrically arranged, and floating adjustment amount is provided for the sealing plates (31) along the arrangement direction of the through holes (11);

a self-pressure-relief mechanism (4) is arranged at the connecting position of the flashboard (3) and the valve rod (2), and the self-pressure-relief mechanism (4) is used for extruding the sealing plate (31) from two sides, so that the sealing plate (31) is respectively abutted against and hermetically arranged with a medium inlet end (111) and a medium outlet end (112) of the through hole (11);

the self-pressure-relief mechanism (4) comprises ejector rods (41) and wedge blocks (42), the ejector rods (41) are arranged between the two groups of sealing plates (31), guide holes (411) which are obliquely arranged are formed in the ejector rods (41), the wedge blocks (42) are installed at the lower end parts of the valve rods (2), and the wedge blocks (42) penetrate through the guide holes (411);

when the valve rod (2) drives the flashboard (3) to descend, the wedge block (42) is in staggered fit with the guide hole (411) to extrude the ejector rod (41) to move towards the medium inlet end (111) to push against the corresponding sealing plate (31) to be in sealing fit with the medium inlet end (111).

2. The self-venting bellows seal dual gate valve of claim 1, wherein:

the top of the wedge block (42) is connected with the bottom of the valve rod (2) in a penetrating and matching way;

the top of the wedge block (42) is provided with a clamping block (421), the bottom of the valve rod (2) is provided with a clamping groove (21), and the clamping block (421) and the clamping groove (21) are arranged in a penetrating and matching mode.

3. The self-venting bellows seal double gate valve of claim 1, wherein:

the guide hole (411) is obliquely arranged towards the medium outlet end (112), the bottom of the wedge block (42) is arranged in a sloping manner, and when the wedge block (42) moves downwards, the wedge block (42) is in press fit with the inner side wall of the guide hole (411), so that the ejector rod (41) moves towards the medium inlet end (111).

4. A self-relieving bellows seal double gate valve according to any one of claims 1 to 3, wherein:

a pressure relief hole (311) is formed in the position, opposite to the ejector rod (41), of the sealing plate (31) at the medium inlet end (111);

when the wedge block (42) moves downwards, the wedge block (42) is in press fit with the inner side wall of the guide hole (411), so that the ejector rod (41) blocks the pressure relief hole (311) while the ejector rod (41) moves towards the medium inlet end (111);

when the wedge block (42) moves upwards, the ejector rod (41) loses the limiting of the wedge block (42), the ejector rod (41) resets, and the pressure relief holes (311) are communicated with the two sides of the sealing plate (31) to relieve the pressure of the flashboard (3).

5. The self-venting bellows seal double gate valve of claim 4, wherein:

and a sealing ring (312) correspondingly matched with the ejector rod (41) is arranged at the top sealing position of the ejector rod (41) and the pressure relief hole (311).

6. The self-venting bellows seal dual gate valve of claim 1, wherein:

the self-pressure-relief mechanism (4) further comprises a wedge-shaped block (43), and the wedge-shaped block (43) is installed at the lower end part of the valve rod (2);

one side of the sealing plate (31) corresponding to the wedge-shaped block (43) is provided with a swelling block (313) matched with the wedge-shaped block (43), and through the matching of the wedge-shaped block (43) and the swelling block (313), the sealing plate (31) moves towards the corresponding side and is in interference sealing with the corresponding medium inlet end (111) and the medium outlet end (112) respectively.

7. The self-venting bellows seal dual gate valve of claim 6, wherein:

the wedge-shaped block (43) comprises an extrusion block (433) arranged in a wedge shape and limiting blocks (434) located on two sides of the extrusion block (433).

8. The self-venting bellows seal double gate valve of claim 6, wherein:

the wedge-shaped block (43) is provided with an installation hole (435) for the ejector rod (41) to pass through, and the wedge-shaped block (43) is also provided with an installation groove (436) for the wedge block (42) to be installed.

9. The self-venting bellows seal dual gate valve of claim 6, wherein:

the top of the wedge-shaped block (43) is connected with the lower end part of the valve rod (2) in a penetrating and matching manner;

the top of the wedge-shaped block (43) is provided with a convex clamping groove (437), and the lower end part of the valve rod (2) is provided with a clamping block (22) correspondingly matched with the clamping groove (437).

10. The self-venting bellows seal dual gate valve of claim 1, wherein:

the outside cladding of valve rod (2) has and is the bellows (23) that shrink expansion set up along with valve rod (2) remove.