CN219692384U

CN219692384U - Valve negative pressure protection device

Info

Publication number: CN219692384U
Application number: CN202321037578.5U
Authority: CN
Inventors: 丛立; 顾永伟; 姜思敏
Original assignee: Jiangsu Cryote Cryogenic Technology Co ltd
Current assignee: Jiangsu Cryote Cryogenic Technology Co ltd
Priority date: 2023-05-04
Filing date: 2023-05-04
Publication date: 2023-09-15
Anticipated expiration: 2033-05-04

Abstract

The utility model relates to a valve negative pressure protection device which comprises a valve cover, a valve body, a valve rod and a connecting seat, wherein the connecting seat is sleeved at the joint of the valve cover and the valve body, the valve rod penetrates through the valve cover and the valve body, a sealing component is arranged between the valve rod and the valve cover and between the valve rod and the valve body, and the valve cover and the joint of the valve cover and the valve body are provided with protection devices. The corrugated pipe sleeved on the valve rod is used for sealing the second through hole, the sealing seat is used for axially sealing the joint of the valve, and the connecting seat positioned on the outer ring of the cavity is used for circumferentially sealing the joint of the valve; the protection device is arranged at the sealing component of the valve joint, a first through hole is formed in the axial sealing of the valve cover filler, and another closed pipeline system is led into the outer ring of the sealing seat at the joint of the valve body and the valve cover to form the valve protection device.

Description

Valve negative pressure protection device

Technical Field

The utility model relates to the technical field of valves, in particular to a valve negative pressure protection device.

Background

The valve is used as a pipeline accessory for opening and closing a pipeline, controlling the flow direction, adjusting and controlling the parameters of a conveying medium, the working environment of the valve has higher requirements on the sealing performance of the valve, the valve is usually sealed by adopting a rubber sealing ring, a metal sealing ring, a filler sealing, a corrugated pipe sealing and other structures, and the valve is in an overpressure running state for a long time and has the condition of sealing failure.

When the valve works in a negative pressure occasion and the purity of the internal circulating medium is higher, the running pressure in the valve is lower than the external pressure of the valve, and if the sealing component fails, the negative pressure environment in the valve causes the atmosphere or the medium outside the valve to leak into the valve body to pollute the whole system pipeline, and the purity of the pipeline medium is destroyed.

Disclosure of Invention

The utility model aims to provide a valve negative pressure protection device aiming at the defects in the prior art.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: a valve negative pressure protection device comprising: the valve comprises a valve cover, a valve body, a valve rod and a connecting seat, wherein the connecting seat is sleeved at the joint of the valve cover and the valve body, the valve rod penetrates through the valve cover and the valve body, a sealing assembly is arranged between the valve rod and the valve cover and between the valve rod and the valve body, and a protection device is arranged at the joint of the valve cover and the valve body;

the valve cover and the valve body are respectively provided with a first through hole and a second through hole, the valve rod can be installed, the connecting ends of the valve cover and the valve body are respectively provided with a first connecting part and a second connecting part in a protruding mode, cavities are formed in the first connecting part and the second connecting part, and the connecting seat is sleeved on the outer ring of the cavity;

the protection device comprises a first air guide pipe and a second air guide pipe which are respectively arranged on the valve cover and the connecting seat, and the first air guide pipe and the second air guide pipe are respectively communicated with the first through hole and the cavity.

Further, the sealing assembly comprises a filler, a sealing seat and a corrugated pipe, wherein the filler, the sealing seat and the corrugated pipe are respectively arranged in the first through hole, the cavity and the second through hole;

the packing is tightly pressed in the first through hole through a gland sleeved on the valve rod, the sealing seat and the corrugated pipe are sleeved on the valve rod, and one end of the corrugated pipe is connected with the sealing seat.

Further, a ring seat is arranged in the first through hole, and the first through hole comprises an upper half part and a lower half part which are positioned at two sides of the ring seat;

the packing is arranged on the upper half part and is pressed on the ring seat through the gland, and the first air duct is communicated with the lower half part.

Further, a first sealing ring is arranged at the connection part of the connecting seat and the first and second connecting parts, and the first sealing ring is arranged on the inner wall of the connecting seat;

and second sealing rings are arranged at the joints of the sealing seat, the first connecting part and the second connecting part.

Further, the first and second connection parts include first and second seating grooves respectively communicating with the first and second through holes;

the first positioning groove and the second positioning groove form the cavity, and the second sealing ring is arranged on the end surfaces of two sides of the sealing seat and is respectively pressed on the first positioning groove and the second positioning groove.

Further, a first annular groove and a second annular groove are respectively formed in the bottoms of the first accommodating groove and the second accommodating groove, and a first boss and a second boss are respectively arranged at two ends of the sealing seat;

the second sealing ring is sleeved on the first boss and the second boss outer ring respectively, and the first boss and the second boss are matched with the first annular groove and the second annular groove respectively.

Further, the protection device further comprises a general catheter, and the general catheter is communicated with the first air duct and the second air duct through a three-way valve.

Further, the gland comprises a cover body and a compression column matched with the first through hole, the cover body is connected with the valve cover through a compression bolt, and the gland is abutted to one end of the compression column and presses the compression column to the packing.

Further, an actuator is disposed on the valve cover, and is connected to the valve rod and is capable of driving the valve rod to move along the length direction thereof.

Further, the valve cover, the connecting seat and the valve body are connected through fixing bolts.

The beneficial effects of the utility model are as follows:

in the utility model, the valve body extends to the system pipeline through the outer pipe welded at the bottom of the valve body, the outer pipe is communicated with the second through hole of the valve body, the corrugated pipe sleeved on the valve rod extends to the outer pipe from the second through hole to play a sealing role, a cavity is formed at the joint of the valve body and the valve cover, the axial sealing of the joint of the valve is realized by arranging the sealing seat in the cavity, and the circumferential sealing of the joint of the valve is realized by sleeving the connecting seat at the outer ring of the cavity.

The valve protection device is formed by introducing another closed pipeline system into the first through hole of the valve cover packing which is sealed at the same axial direction and the outer ring of the sealing seat at the joint of the valve body and the valve cover, and pure working medium higher than external pressure is filled into the protection device, so that the pressure in the protection device generates a positive pressure difference relative to the external of the valve, thereby eliminating the possibility that the external environment medium pollutes the interior of the valve body.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present utility model, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.

FIG. 1 is a schematic view of a valve and a protection device thereon according to the present utility model;

FIG. 2 is a schematic diagram of an exploded construction of a valve according to the present utility model;

FIG. 3 is a schematic view of the structure of the valve body according to the present utility model;

FIG. 4 is a schematic diagram of the connection of the valve body, the connection seat and the valve cover in the present utility model;

FIG. 5 is a front view of the valve of the present utility model;

FIG. 6 is a schematic cross-sectional view of a valve according to the present utility model.

Reference numerals: 1. a valve cover; 11. a first through hole; 111. a ring seat; 112. an upper half; 113. a lower half; 12. a first connection portion; 121. a first seating groove; 122. a first ring groove; 13. a fixing bolt; 2. a valve body; 21. a second through hole; 22. a second connecting portion; 221. a second seating groove; 222. a second ring groove; 3. a valve stem; 4. a connecting seat; 41. a first seal ring; 5. a seal assembly; 51. a filler; 52. a sealing seat; 521. a second seal ring; 522. a first boss; 523. a second boss; 53. a bellows; 54. a gland; 541. a cover body; 542. pressing a column; 55. a compression bolt; 6. a protection device; 61. a first air duct; 62. a second air duct; 63. a general catheter; 64. a three-way valve; 7. a cavity; 8. an actuator.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

The negative pressure protection device for the valve comprises a valve cover 1, a valve body 2, a valve rod 3 and a connecting seat 4, wherein the connecting seat 4 is sleeved at the joint of the valve cover 1 and the valve body 2, the valve rod 3 penetrates through the valve cover 1 and the valve body 2, a sealing component 5 is arranged between the valve rod 3 and the valve cover 1 and the valve body 2, and a protection device 6 is arranged at the joint of the valve cover 1 and the valve body 2; the valve cover 1 and the valve body 2 are respectively provided with a first through hole 11 and a second through hole 21, a valve rod 3 can be installed, a first connecting part 12 and a second connecting part 22 are respectively arranged at the connecting ends of the valve cover 1 and the valve body 2 in a protruding mode, a cavity 7 is formed in the first connecting part 12 and the second connecting part 22, and a connecting seat 4 is sleeved on the outer ring of the cavity 7; the protection device 6 comprises a first air duct 61 and a second air duct 62 which are respectively arranged on the valve cover 1 and the connecting seat 4, and the first air duct 61 and the second air duct 62 are respectively communicated with the first through hole 11 and the cavity 7.

Wherein, the sealing component 5 comprises a packing 51, a sealing seat 52 and a corrugated pipe 53, and the packing 51, the sealing seat 52 and the corrugated pipe 53 are respectively arranged in the first through hole 11, the cavity 7 and the second through hole 21; the packing 51 is pressed in the first through hole 11 through a gland 54 sleeved on the valve rod 3, the sealing seat 52 and the corrugated pipe 53 are sleeved on the valve rod 3, and one end of the corrugated pipe 53 is connected with the sealing seat 52.

In the utility model, the valve body 2 extends to a system pipeline through an outer pipe welded at the bottom of the valve body, the outer pipe is communicated with a second through hole 21 of the valve body 2, a corrugated pipe 53 sleeved on the valve rod 3 extends to the outer pipe from the second through hole 21 to play a sealing role, a cavity 7 is formed at the joint of the valve body 2 and the valve cover 1, axial sealing of the valve joint is realized through a sealing seat 52 arranged in the cavity 7, and circumferential sealing of the valve joint is realized through a connecting seat 4 sleeved on the outer ring of the cavity 7.

As a preference of the above embodiment, the protection device 6 is disposed corresponding to the sealing component 5 at the valve connection, specifically, at the first through hole 11 where the packing 51 of the valve cover 1 is sealed at the same axial direction, and the outer ring of the sealing seat 52 at the connection of the valve body 2 and the valve cover 1 is led into another closed pipeline system to form the valve protection device 6, and pure working medium higher than external pressure is filled into the protection device 6, so that a positive pressure difference is generated in the protection device 6 relative to the external of the valve, thereby eliminating the possibility that the external environment medium pollutes the interior of the valve body 2.

According to the utility model, through the protection device 6, the condition that the valve leaks into the valve body 2 to pollute the whole system pipeline due to the negative pressure environment in the valve under the conditions of overpressure operation, faults, debugging, sealing ring failure and the like can be prevented; when the valve inner sealing component 5 fails, the protecting device 6 can preferentially enable pure running medium to enter the pipeline, so that the pipeline is prevented from being polluted by external medium.

As shown in the schematic cross-sectional view of the valve in fig. 6, a ring seat 111 is provided in the first through hole 11, and the first through hole 11 includes an upper half 112 and a lower half 113 located at both sides of the ring seat 111; the packing 51 is disposed on the upper half 112 and is pressed against the ring seat 111 by the gland 54, and the first air duct 61 communicates with the lower half 113.

The ring seat 111 is arranged in the first through hole 11, so that the packing 51 in the valve cover 1 is conveniently pressed, the lower half 113 is positioned between the packing 51 and the sealing seat 52 and two sealing components 5, and a closed protection space is formed by matching with the first air duct 61 in the protection device 6, so that the condition that the sealing components 5 at two sides of the protection device fail to cause the outside medium to be sucked into a pipeline is avoided.

As shown in fig. 2, a first sealing ring 41 is arranged at the connection part of the connecting seat 4 and the first connecting part 12 and the second connecting part 22, and the first sealing ring 41 is arranged on the inner wall of the connecting seat 4; a second sealing ring 521 is provided at the junction of the sealing seat 52 with the first and second connection portions 12 and 22.

By providing the second seal ring 521 and the first seal ring 41 on the contact surfaces between the inner and outer sides of the first connecting portion 12 and the second connecting portion 22 and the seal seat 52 and the connecting seat 4, respectively, the axial sealing effect and the circumferential sealing effect at the joint of the valve cover 1 and the valve body 2 are optimized.

As a preferable sealing structure of the first and second connection parts 12 and 22, referring specifically to fig. 3 and 4, the first and second connection parts 12 and 22 include first and second seating grooves 121 and 221 communicating with the first and second through holes 11 and 21, respectively; the first seating groove 121 and the second seating groove 221 form the cavity 7, and the second sealing ring 521 is disposed on both side end surfaces of the sealing seat 52 and is pressed against the first seating groove 121 and the second seating groove 221, respectively.

Further, a first ring groove 122 and a second ring groove 222 are respectively formed at the bottoms of the first positioning groove 121 and the second positioning groove 221, and a first boss 522 and a second boss 523 are respectively formed at two ends of the sealing seat 52; the second sealing ring 521 is sleeved on the outer rings of the first boss 522 and the second boss 523, and the first boss 522 and the second boss 523 are respectively matched with the first ring groove 122 and the second ring groove 222.

As shown in fig. 6, the first boss 522 and the second boss 523 are respectively matched with the first ring groove 122 and the second ring groove 222, so that a plane sealing effect is formed between the peripheral side walls of the bosses on two sides of the sealing seat 52 and the inner walls of the two ring grooves; the second sealing ring 521 sleeved on the outer ring of the boss achieves the sealing effect between the cavity 7 and the first through hole 11 and the second through hole 21, and meanwhile, a closed protection cavity communicated with the protection device 6 is formed before the connecting seat 4 and the sealing seat 52, so that the sealing component 5 at the corrugated pipe 53 or the sealing seat 52 is prevented from being invalid in the using process of the valve.

As shown in fig. 2, the protection device 6 further comprises a general conduit 63, and the general conduit 63 communicates with the first air duct 61 and the second air duct 62 through a three-way valve 64.

The pressing cover 54 includes a cover body 541 and a pressing column 542 adapted to the first through hole 11, the cover body 541 is connected to the valve cover 1 by a pressing bolt 55, and the pressing cover 54 abuts against one end of the pressing column 542 and presses the pressing column 542 toward the packing 51. The valve cover 1, the connecting seat 4 and the valve body 2 are connected through a fixing bolt 13.

By screwing or unscrewing the fixing bolt 13, the state of compression between the gland 54 and the packing 51 is adjusted.

Further, the pressing cover 54 includes a cover body 541 and a pressing column 542 corresponding to the first through hole 11, the cover body 541 is connected to the valve cover 1 by a pressing bolt 55, and the pressing cover 54 abuts against one end of the pressing column 542 and presses the pressing column 542 toward the packing 51.

In the utility model, the actuating mechanism 8 is arranged on the valve cover 1, the actuating mechanism 8 is connected with the valve rod 3 and can drive the valve rod 3 to move along the length direction of the valve rod, so that the regulation and control of the valve on the pipeline system medium are realized.

It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A valve negative pressure protection device, comprising: valve gap (1), valve body (2), valve rod (3) and connecting seat (4), connecting seat (4) cover is established valve gap (1) with the junction of valve body (2), valve rod (3) run through valve gap (1) with valve body (2), and be provided with seal assembly (5) between valve rod (3) and valve gap (1) and valve body (2) valve gap (1) and junction with valve body (2) are provided with protection device (6);

a first through hole (11) and a second through hole (21) are respectively formed in the valve cover (1) and the valve body (2) and can be used for installing the valve rod (3), a first connecting part (12) and a second connecting part (22) are respectively arranged at the connecting ends of the valve cover (1) and the valve body (2) in a protruding mode, a cavity (7) is formed in the first connecting part (12) and the second connecting part (22), and the connecting seat (4) is sleeved on the outer ring of the cavity (7);

the protection device (6) comprises a first air guide pipe (61) and a second air guide pipe (62) which are respectively arranged on the valve cover (1) and the connecting seat (4), and the first air guide pipe (61) and the second air guide pipe (62) are respectively communicated with the first through hole (11) and the cavity (7).

2. Valve negative pressure protection device according to claim 1, characterized in that the sealing assembly (5) comprises a packing (51), a sealing seat (52) and a bellows (53), the packing (51), the sealing seat (52) and the bellows (53) being arranged in the first through hole (11), the cavity (7) and the second through hole (21), respectively;

the packing (51) is tightly pressed in the first through hole (11) through a gland (54) sleeved on the valve rod (3), the sealing seat (52) and the corrugated pipe (53) are sleeved on the valve rod (3), and one end of the corrugated pipe (53) is connected with the sealing seat (52).

3. Valve negative pressure protection device according to claim 2, characterized in that a ring seat (111) is provided in the first through hole (11), the first through hole (11) comprising an upper half (112) and a lower half (113) on both sides of the ring seat (111);

the packing (51) is arranged on the upper half part (112) and is pressed on the ring seat (111) through the pressing cover (54), and the first air guide pipe (61) is communicated with the lower half part (113).

4. A valve negative pressure protection device according to claim 3, characterized in that a first sealing ring (41) is arranged at the connection of the connecting seat (4) with the first connecting part (12) and the second connecting part (22), and the first sealing ring (41) is arranged on the inner wall of the connecting seat (4);

a second sealing ring (521) is arranged at the joint of the sealing seat (52) and the first connecting part (12) and the second connecting part (22).

5. The valve negative pressure protection device according to claim 4, characterized in that the first connection part (12) and the second connection part (22) comprise a first seating groove (121) and a second seating groove (221) in communication with the first through hole (11) and the second through hole (21), respectively;

the first placing groove (121) and the second placing groove (221) form the cavity (7), and the second sealing ring (521) is arranged on two side end faces of the sealing seat (52) and is respectively pressed on the first placing groove (121) and the second placing groove (221).

6. The valve negative pressure protection device according to claim 5, wherein a first annular groove (122) and a second annular groove (222) are respectively formed at the bottoms of the first positioning groove (121) and the second positioning groove (221), and a first boss (522) and a second boss (523) are respectively formed at two ends of the sealing seat (52);

the second sealing ring (521) is sleeved on the outer rings of the first boss (522) and the second boss (523), and the first boss (522) and the second boss (523) are respectively matched with the first annular groove (122) and the second annular groove (222).

7. Valve negative pressure protection device according to claim 1, characterized in that the protection device (6) further comprises a main conduit (63), which main conduit (63) communicates with the first air duct (61) and the second air duct (62) via a three-way valve (64).

8. The valve negative pressure protection device according to claim 2, wherein the gland (54) comprises a cover body (541) and a pressure column (542) corresponding to the first through hole (11), the cover body (541) is connected with the valve cover (1) through a compression bolt (55), and the gland (54) abuts against one end of the pressure column (542) and presses the pressure column (542) toward the packing (51).

9. Valve negative pressure protection device according to claim 1, characterized in that an actuator (8) is arranged on the valve cap (1), the actuator (8) being connected to the valve stem (3) and being capable of driving the valve stem (3) to move in its length direction.

10. Valve negative pressure protection device according to claim 1, characterized in that the valve cap (1), the connecting seat (4) and the valve body (2) are connected by means of a fixing bolt (13).