阅读说明：本技术 一种管道闸阀 (Pipeline gate valve ) 是由 蓝晶晶 于 2020-06-12 设计创作，主要内容包括：本发明涉及闸阀技术领域,尤其涉及的是一种管道闸阀,包括阀体、阀盖、阀杆和闸板。本发明通过闸板的开启、关闭形成的介质压力变化控制两导向组件的间距,使得闸板两侧延伸设置的导向叉,沿导向组件上下移动,以此实现闸板启闭过程顺畅进行,闸板启闭完成后闸板与阀体之间形成密封,由此降低闸板受介质冲击而振动,延伸闸板的使用寿命。(The invention relates to the technical field of gate valves, in particular to a pipeline gate valve which comprises a valve body, a valve cover, a valve rod and a gate plate. According to the invention, the distance between the two guide assemblies is controlled through the medium pressure change formed by opening and closing the flashboard, so that the guide forks extending from the two sides of the flashboard move up and down along the guide assemblies, the flashboard can be opened and closed smoothly, and the flashboard and the valve body form a seal after the flashboard is opened and closed, thereby reducing the vibration of the flashboard caused by medium impact and prolonging the service life of the flashboard.)

1. A pipeline gate valve comprises a valve body, a valve cover, a valve rod and a gate plate, wherein the valve cover is arranged on the valve body and is connected with the valve body to form a middle cavity; the flashboard is arranged in the valve body, and a pull sleeve is arranged on the flashboard; the lower end of the valve rod is provided with a pull head matched with the pull sleeve; the lower end of the valve rod penetrates through the valve cover and is positioned in the middle cavity, so that the pull head is arranged on the pull sleeve; the gate plate divides the interior of the valve body into an inlet cavity and an outlet cavity; the method is characterized in that:

two guide forks are arranged at the lower part of the flashboard in a radially outward extending manner and are symmetrically arranged; guide components are arranged on two sides of each guide fork; when the flashboard is opened and closed, the guide fork moves along the guide assembly;

the guide assembly comprises a cylinder sleeve and a guide sheet;

the cylinder sleeve is arranged on one side in the valve body, and the bottom wall of the cylinder sleeve is fixedly connected with the bottom wall of the valve body; an air inlet hole is formed in the side wall of one side, close to the valve body, of the cylinder sleeve; a cylinder cover is fixedly arranged on one side of the cylinder sleeve, which is far away from the air inlet; a piston matched with the inner wall of the cylinder sleeve is arranged between the cylinder sleeve and the cylinder cover, and a return spring is arranged between the piston and the cylinder cover;

breathing holes which penetrate through the valve body and the cylinder sleeve are formed in the bottom wall of the valve body and the bottom wall of the cylinder sleeve; the inner port of the breathing hole is communicated between the piston and the cylinder cover;

the guide sheet is positioned on one side of the cylinder cover far away from the piston; the piston is provided with a piston rod penetrating through the cylinder cover, and one end, far away from the piston, of the piston rod is fixedly connected to the guide sheet.

2. A pipe gate valve according to claim 1, wherein: the guide fork comprises a positioning piece, a pushing piece and an elastic piece; the elastic piece is arranged between the positioning piece and the pushing piece.

3. A pipe gate valve according to claim 1, wherein: the guide assembly comprises a side inlet guide assembly and a side outlet guide assembly which are positioned at two sides of the guide fork; the positioning piece is close to the guide piece of the leading-out side guide assembly; the push sheet is close to the guide sheet of the side inlet guide assembly.

4. A pipe gate valve according to claim 1, wherein: the side surface of the guide piece close to the guide fork is provided with a plurality of side rollers, and the side rollers are partially positioned on the outer side of the guide piece; all the side rollers are arranged in parallel, and the axial directions of all the side rollers are perpendicular to the moving direction of the flashboard.

5. A pipe gate valve according to claim 1, wherein: the side surface of the guide piece close to the guide fork is provided with a side mounting groove matched with the side rolling column; one end of the side mounting groove, which is far away from the flashboard, is provided with an end hole, and the other end of the side mounting groove is provided with a limiting hole; the diameter of the end hole is larger than that of the side roller, and the side roller is arranged in the side mounting groove through the end hole; a limiting block is arranged in the end hole; the diameter of the limiting hole is smaller than that of the side roller.

6. A pipe gate valve according to claim 1, wherein: an upper convex part extends inwards from the inner wall of the upper part of the valve body; the upper convex part is provided with an upper fixed block; the valve body diapire is equipped with down the mounting groove, and cylinder liner fixed mounting is between mounting groove and the last fixed block down.

7. A pipe gate valve according to claim 6, wherein: an upper mounting groove matched with the upper end of the cylinder sleeve is arranged below the upper fixing block.

8. A pipe gate valve according to claim 1, wherein: the piston rod and the guide sheet are integrally manufactured.

9. A pipe gate valve according to claim 1, wherein: a support is arranged on the valve cover, and a threaded sleeve is arranged at the upper end part of the support; the screw sleeve is upwards provided with an extending part; the upper part of the valve rod is in threaded connection with the threaded sleeve; and a hand wheel is arranged outside the extension part of the screw sleeve.

10. A pipe gate valve according to claim 1, wherein: a packing structure is arranged between the valve rod and the valve cover; the packing structure comprises packing, a gland and a loose joint bolt; an inwards concave filling groove is formed in the valve cover, and the filling is filled in the filling groove; the lower part of the gland is matched with the packing groove and is used for compressing the packing in the packing groove; the gland and the valve cover are fixedly connected through a loose joint bolt.

Technical Field

The invention relates to the technical field of gate valves, in particular to a pipeline gate valve.

Background

The gate valve is widely applied to industries such as petroleum refining, long-distance pipelines, chemical industry, papermaking, pharmacy, water conservancy, electric power, municipal administration, steel and the like.

The wedge gate valve has a good sealing effect because the sealing surface of the valve forms a certain angle with the vertical center line, so that the wedge gate valve can bear larger pressure.

Disclosure of Invention

The invention aims to overcome the defects and provide a pipeline gate valve.

In order to achieve the purpose, the technical solution of the invention is as follows: a pipeline gate valve comprises a valve body, a valve cover, a valve rod and a gate plate, wherein the valve cover is arranged on the valve body and is connected with the valve body to form a middle cavity; the flashboard is arranged in the valve body, and a pull sleeve is arranged on the flashboard; the lower end of the valve rod is provided with a pull head matched with the pull sleeve; the lower end of the valve rod penetrates through the valve cover and is positioned in the middle cavity, so that the pull head is arranged on the pull sleeve; the flashboard divides the interior of the valve body into an inlet cavity and an outlet cavity.

Two guide forks are arranged at the lower part of the flashboard in a radially outward extending manner and are symmetrically arranged; guide components are arranged on two sides of each guide fork; when the flashboard is opened and closed, the guide fork moves along the guide assembly;

the guide assembly comprises a cylinder sleeve and a guide sheet;

the cylinder sleeve is arranged on one side in the valve body, and the bottom wall of the cylinder sleeve is fixedly connected with the bottom wall of the valve body; an air inlet hole is formed in the side wall of one side, close to the valve body, of the cylinder sleeve; a cylinder cover is fixedly arranged on one side of the cylinder sleeve, which is far away from the air inlet; and a piston matched with the inner wall of the cylinder sleeve is arranged between the cylinder sleeve and the cylinder cover, and a return spring is arranged between the piston and the cylinder cover. A piston cavity is formed between the piston and the cylinder sleeve.

Breathing holes which penetrate through the valve body and the cylinder sleeve are formed in the bottom wall of the valve body and the bottom wall of the cylinder sleeve; the inner port of the breathing hole is communicated between the piston and the cylinder cover, and the air pressure at the bottom in the cylinder sleeve is consistent with the air pressure outside the valve body, so that the piston can move conveniently;

the guide sheet is positioned on one side of the cylinder cover far away from the piston; the piston is provided with a piston rod penetrating through the cylinder cover, and one end, far away from the piston, of the piston rod is fixedly connected to the guide sheet.

Preferably, the guide fork comprises a positioning piece, a pushing piece and an elastic piece; the elastic piece is arranged between the positioning piece and the pushing piece.

Preferably, the guide assembly comprises a side inlet guide assembly and a side outlet guide assembly which are positioned at two sides of the guide fork; the positioning piece is close to the guide piece of the leading-out side guide assembly; the push sheet is close to the guide sheet of the side inlet guide assembly.

Preferably, the side surface of the guide piece close to the guide fork is provided with a plurality of side rollers, and the side rollers are partially positioned on the outer side of the guide piece; all the side rollers are arranged in parallel, and the axial directions of all the side rollers are perpendicular to the moving direction of the flashboard.

Preferably, a side mounting groove matched with the side roller is formed in the side face, close to the guide fork, of the guide piece; one end of the side mounting groove, which is far away from the flashboard, is provided with an end hole, and the other end of the side mounting groove is provided with a limiting hole; the diameter of the end hole is larger than that of the side roller, and the side roller is arranged in the side mounting groove through the end hole; a limiting block is arranged in the end hole; the diameter of the limiting hole is smaller than that of the side roller.

Preferably, an upper convex part extends inwards from the inner wall of the upper part of the valve body; the upper convex part is provided with an upper fixed block; the valve body diapire is equipped with down the mounting groove, and cylinder liner fixed mounting is between mounting groove and the last fixed block down.

Preferably, an upper mounting groove matched with the upper end part of the cylinder sleeve is arranged below the upper fixing block.

Preferably, the return spring is a belleville spring.

Preferably, the piston rod and the guide piece are integrally manufactured.

Preferably, a support is arranged on the valve cover, and a threaded sleeve is arranged at the upper end of the support; the screw sleeve is upwards provided with an extending part; the upper part of the valve rod is in threaded connection with the threaded sleeve; and a hand wheel is arranged outside the extension part of the screw sleeve.

Preferably, a packing structure is arranged between the valve rod and the valve cover; the packing structure comprises packing, a gland and a loose joint bolt; an inwards concave filling groove is formed in the valve cover, and the filling is filled in the filling groove; the lower part of the gland is matched with the packing groove and is used for compressing the packing in the packing groove; the gland and the valve cover are fixedly connected through a loose joint bolt.

In the traditional wedge gate valve, a guide shin is arranged on the wall part of a cavity in a valve body, and due to machining or installation errors, in order to ensure that two sealing surfaces (an inlet side sealing surface and an outlet side sealing surface) of a flashboard and two sealing surfaces (an inlet side sealing surface and an outlet side sealing surface) of a valve seat can form sealing simultaneously, a gap must be reserved between the outer side of the flashboard and the guide shin, interference cannot be formed, and a valve rod of the wedge gate valve is freely connected with the flashboard (namely, a gap is reserved between a pull head and a pull sleeve), and interference cannot be formed.

When the valve is closed, when two sealing surfaces (an inlet side sealing surface and an outlet side sealing surface) of the gate plate and two sealing surfaces (an inlet side sealing surface and an outlet side sealing surface) of the valve seat can form sealing simultaneously, a gap must be reserved between the guide fork and the guide assembly without interference, and a valve rod of the wedge type gate valve is freely connected with the gate plate (namely, a gap is reserved between the pull head and the pull sleeve), so that interference is not formed; when the valve is opened, the guide fork and the guide assembly form up-and-down guide without clearance, and when the semi-opened flashboard is impacted by a medium in the flowing process, violent vibration cannot be caused, and the end part (namely the pull head) of the valve rod cannot be easily abraded and broken.

Description of the principles of the invention:

when the flashboard is opened, the inlet cavity is communicated with the middle cavity and the outlet cavity, media in the middle cavity respectively enter the piston cavity through the air inlet holes of the guide assemblies, the pistons of the two guide assemblies (the inlet guide assembly and the outlet guide assembly) are pushed to be close to each other, and the two guide pieces respectively press the guide forks, so that the side rollers of the two guide assemblies respectively press two side surfaces of the guide forks, the flashboard can stably move up and down, and vibration is not formed when the flashboard is impacted by the media. Meanwhile, the side roller rolls when moving up and down on the guide fork, so that overlarge friction force cannot be generated on the guide fork, and the moment for opening or closing the valve cannot be increased.

When the flashboard is closed, because the guide fork contains locating piece, flexure strip and kicking piece, under the effect of kicking piece, form the contact earlier between the sealed face of the play side of flashboard and the sealed face of the play side of disk seat between the sealed face of the advancing side of flashboard and the sealed face of the play side of disk seat. Thus, when the inlet side sealing surface of the shutter plate contacts the inlet side sealing surface of the valve seat, the flow rate of the medium flowing into the middle chamber from the inlet chamber is smaller than the flow rate of the medium flowing into the outlet chamber from the middle chamber. At the moment, the medium pressure in the middle cavity is reduced, so that the medium pressure in the piston cavity is reduced, under the pushing action of the belleville spring, the pistons of the two guide assemblies are pushed to be away from each other, and finally the two guide pieces are separated from the contact with the guide fork respectively, so that a gap is formed between the guide pieces and the guide fork, at the moment, the gap is reserved between the guide fork and the guide assemblies, no interference is formed, and when the flashboard is continuously moved downwards to be closed, two sealing surfaces (an inlet side sealing surface and an outlet side sealing surface) of the flashboard and two sealing surfaces (an inlet side sealing surface and an outlet side sealing surface) of the valve seat can simultaneously form sealing.

By adopting the technical scheme, the invention has the beneficial effects that: according to the invention, the distance between the two guide assemblies is controlled through the medium pressure change formed by opening and closing the flashboard, so that the guide forks extending from the two sides of the flashboard move up and down along the guide assemblies, the flashboard is smoothly opened and closed, and the flashboard and the valve body form sealing after the flashboard is opened and closed, thereby reducing the vibration of the flashboard caused by medium impact and prolonging the service life of the flashboard and the valve rod.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 along the line A-A;

FIG. 3 is a schematic view of the structure of FIG. 2 in the direction D-D;

fig. 4 is an enlarged view of the guide fork of fig. 3.

Description of the main reference numerals: 1. a valve body; 2. a valve seat; 3. a shutter plate; 4. an inlet chamber; 5. a slider; 6. pulling the sleeve; 7. a valve cover; 8. a valve stem; 9. a filler; 10. loose joint bolts; 11. a gland; 12. a support; 13. a threaded sleeve; 14. a hand wheel; 15. a middle cavity; 16. an outlet chamber; 17. a packing groove; 18. a guide assembly; 19. an upper convex portion; 20. a guide fork; 21. mounting a mounting groove; 22. a limiting hole; 23. a side roller; 24. a limiting block; 25. an upper fixed block; 26. a connecting screw; 27. a breathing hole; 28. a cylinder liner; 29. a piston; 30. a guide piece; 31. a belleville spring; 33. an air inlet; 34. a lower mounting groove; 35. a cylinder cover; 36. a piston rod; 37. a side mounting groove; 44. a piston cavity; 46. positioning plates; 47. pushing the sheet; 48. an elastic sheet.

Detailed Description

The invention is further described below with reference to the figures and the specific embodiments. The directional phrases used in this disclosure include, for example: the directional terms such as up, down, left, right, inner, outer, etc. are used only with reference to the orientation of the attached FIG. 1 of the specification. Accordingly, the directional terminology used is intended to be illustrative only and is not intended to be limiting of the invention.

As shown in fig. 1-4, the pipe gate valve of the present invention comprises a valve body 1, a valve cover 7, a valve rod 8 and a gate plate 3, wherein the valve cover 7 is installed on the valve body 1, and the valve cover 7 is connected with the valve body 1 to form a middle cavity 15; the flashboard 3 is arranged in the valve body 1, and a pull sleeve 6 is arranged on the flashboard 3; the lower end of the valve rod 8 is provided with a pull head 5 matched with the pull sleeve 6; the lower end of the valve rod 8 penetrates through the valve cover 7 and is positioned in the middle cavity 15, so that the pull head 5 is installed on the pull sleeve 6.

A bracket 12 is arranged on the valve cover 7, and a threaded sleeve 13 is arranged at the upper end part of the bracket 12; the screw sleeve 13 is upwards provided with an extending part; the upper part of the valve rod 8 is in threaded connection with a threaded sleeve 13; a hand wheel 14 is arranged outside the extension part of the screw sleeve 13.

A packing 9 structure is arranged between the valve rod 8 and the valve cover 7; the packing 9 structure comprises a packing 9, a gland 11 and a loose joint bolt 10; an inwards concave filling groove 17 is formed in the valve cover 7, and the filling 9 is filled in the filling groove 17; the lower part of the gland 11 is matched with the packing groove 17 and is used for pressing the packing 9 in the packing groove 17; the gland 11 and the valve cover 7 are fixedly connected through a loose joint bolt 10.

The shutter plate 3 divides the interior of the valve body 1 into an inlet chamber 4 and an outlet chamber 16.

Two guide forks 20 are arranged at the lower part of the gate plate 3 in a radially outward extending manner, and the two guide forks 20 are symmetrically arranged; guide components 18 are arranged on two sides of each guide fork 20; when the shutter 3 is opened and closed, the guide fork 20 moves along the guide member.

The guide fork 20 comprises a positioning piece 46, a pushing piece 47 and an elastic piece 48; the elastic piece 48 is installed between the positioning piece 46 and the pushing piece 47.

The guide assembly 18 includes a cylinder liner 28 and a guide vane 30.

An upper convex part 19 extends inwards from the inner wall of the upper part of the valve body 1; the upper convex part 19 is provided with an upper fixing block 25 through a connecting screw 26; an upper mounting groove 21 matched with the upper end part of the cylinder sleeve 28 is arranged below the upper fixing block 25. The bottom wall of the valve body 1 is provided with a lower mounting groove 34, and the cylinder sleeve 28 is fixedly mounted between the lower mounting groove 34 and the upper fixing block 25. An air inlet hole 33 is formed in the side wall of one side, close to the valve body 1, of the cylinder sleeve 28; and a cylinder cover 35 is fixedly arranged on one side of the cylinder sleeve 28 far away from the air inlet hole 33.

A piston 29 matched with the inner wall of the cylinder sleeve 28 is arranged between the cylinder sleeve 28 and the cylinder cover 35, and a return spring is arranged between the piston 29 and the cylinder cover 35 and is a belleville spring 31. A piston cavity 44 is formed between the piston 29 and the cylinder liner 28.

The bottom wall of the valve body 1 and the bottom wall of the cylinder sleeve 28 are provided with breathing holes 27 which penetrate through the valve body 1 and the cylinder sleeve 28; the inner port of the breathing hole 27 is communicated between the piston 29 and the cylinder cover 35.

The guide sheet 30 is positioned on one side of the cylinder cover 35 far away from the piston 29; the piston 29 is provided with a piston 29 rod penetrating through the cylinder cover 35, and one end of the piston 29 rod far away from the piston 29 is fixedly connected with the guide sheet 30.

The piston 29 rod is made in one piece with the guide plate 30.

The guide assembly 18 comprises a side inlet guide assembly and a side outlet guide assembly which are positioned at two sides of the guide fork 20; the locating tab is adjacent to guide tab 30 of lead-out guide assembly 18; the pusher is adjacent to guide tab 30 of lead in guide assembly 18.

A plurality of side rollers 23 are arranged on the side surface of the guide sheet 30 close to the guide fork 20, and the side rollers 23 are partially positioned on the outer side of the guide sheet 30; all the side rollers 23 are arranged in parallel, and the axial direction of all the side rollers 23 is perpendicular to the moving direction of the shutter 3.

The side surface of the guide sheet 30 close to the guide fork 20 is provided with a side mounting groove 37 matched with the side roller 23; one end of the side mounting groove 37, which is far away from the flashboard 3, is provided with an end hole, and the other end is provided with a limiting hole 22; the diameter of the end hole is larger than that of the side roller 23, and the side roller 23 is arranged in the side mounting groove 37 through the end hole; a limiting block 24 is arranged in the end hole; the diameter of the stopper hole 22 is smaller than the diameter of the side roller 23.

In the traditional wedge gate valve, the wall part of the cavity 15 in the valve body 1 is provided with a guide shin, and due to processing or installation errors, in order to ensure that two sealing surfaces (an inlet side sealing surface and an outlet side sealing surface) of the flashboard 3 and two sealing surfaces (an inlet side sealing surface and an outlet side sealing surface) of the valve seat 2 can form sealing simultaneously, a gap must be left between the outer side of the flashboard 3 and the guide shin, so that interference cannot be formed, and a valve rod 8 of the wedge gate valve is freely connected with the flashboard 3 (namely, the gap is formed between the pull head 5 and the pull sleeve 6), so that interference cannot be.

When the valve is closed, when two sealing surfaces (an inlet side sealing surface and an outlet side sealing surface) of the gate plate 3 and two sealing surfaces (an inlet side sealing surface and an outlet side sealing surface) of the valve seat 2 can form sealing simultaneously, a gap is required to be reserved between the guide fork 20 and the guide assembly 18 without forming interference, and the valve rod 8 of the wedge-type gate valve is freely connected with the gate plate 3 (namely, the gap is reserved between the pull head 5 and the pull sleeve 6) without forming interference; when the valve is opened, the guide fork 20 and the guide assembly 18 form vertical guide without clearance, so that when the semi-opened shutter plate 3 in the flow is impacted by a medium, violent vibration cannot be caused, and the end part of the valve rod 8 (namely the pull head 5) cannot be easily broken by abrasion.

Description of the principles of the invention:

when the gate plate 3 is opened, the inlet cavity 4 is communicated with the middle cavity 15 and the outlet cavity 16, media in the middle cavity 15 respectively enter the piston cavity 44 through the air inlet holes 33 of the guide assemblies 18, the pistons 29 of the two guide assemblies 18 (the inlet guide assembly and the outlet guide assembly) are pushed to be close to each other, the two guide sheets 30 respectively press the guide forks 20, so that the side rollers 23 of the two guide assemblies 18 respectively press the two side surfaces of the guide forks 20, the gate plate 3 can stably move up and down, and vibration can not be formed when the gate plate is impacted by the media. Meanwhile, the side rollers 23 roll when moving up and down on the guide fork 20, so that excessive friction force cannot be generated on the guide fork 20, and the moment for opening or closing the valve cannot be increased.

When the shutter 3 is closed, since the guide fork 20 includes the positioning piece, the elastic piece, and the push piece, under the action of the push piece, contact is formed between the inlet side sealing surface of the shutter 3 and the inlet side sealing surface of the valve seat 2 earlier than between the outlet side sealing surface of the shutter 3 and the outlet side sealing surface of the valve seat 2. Therefore, when the inlet side sealing surface of the shutter plate 3 is in contact with the inlet side sealing surface of the valve seat 2, the flow rate of the medium in the inlet chamber 4 flowing to the middle chamber 15 is smaller than the flow rate of the medium in the middle chamber 15 flowing to the outlet chamber 16. At this time, the medium pressure in the middle chamber 15 decreases, which causes the medium pressure in the piston chamber 44 to decrease, and under the pushing action of the belleville spring 31, the pistons 29 of the two guide assemblies 18 are pushed away from each other, and finally the two guide pieces 30 are respectively separated from the contact with the guide fork 20, so that a gap is formed between the guide pieces 30 and the guide fork 20, at this time, a gap is left between the guide fork 20 and the guide assembly 18, no interference is formed, and when the gate plate 3 is continuously moved downward to be closed, the two sealing surfaces (the inlet side sealing surface and the outlet side sealing surface) of the gate plate 3 and the two sealing surfaces (the inlet side sealing surface and the outlet side sealing surface) of the valve seat 2 can simultaneously form sealing.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the present invention, and all equivalent variations and modifications made in the claims of the present invention should be included in the scope of the present invention.