阅读说明：本技术 一种法兰密封组件 (Flange seal assembly ) 是由 刘玉清 徐延延 于 2021-08-11 设计创作，主要内容包括：本发明公开了一种法兰密封组件,包括法兰一,所述法兰一下端外表面开设有密封槽一,且法兰一下端外表面固定连接有定位环,所述定位环的下端外表面固定连接有挤压环,所述密封槽一内部活动连接有石棉垫,所述法兰一下端外表面活动连接有法兰二,所述法兰二与石棉垫对应位置开设有密封槽二,所述法兰二与定位环对应位置开设有定位槽,所述定位槽内表面开设有挤压槽,所述挤压槽内部活动连接有密封圈,所述定位环的环形外表面均固定连接有第一密封橡胶,所述法兰一下端外表面固定连接有导向块,所述法兰二上端外表面与导向块对应位置开设有导向槽,通过在法兰一与法兰二之间设置多重密封手段大大提高密封性。(The invention discloses a flange sealing assembly which comprises a first flange, wherein a first sealing groove is formed in the outer surface of the lower end of the first flange, and the outer surface of the lower end of the flange is fixedly connected with a positioning ring, the outer surface of the lower end of the positioning ring is fixedly connected with an extrusion ring, the inner part of the first sealing groove is movably connected with an asbestos pad, the outer surface of the lower end of the flange is movably connected with a second flange, a second sealing groove is arranged at the position of the second flange corresponding to the asbestos pad, a positioning groove is arranged at the position of the second flange corresponding to the positioning ring, the inner surface of the positioning groove is provided with an extrusion groove, the inside of the extrusion groove is movably connected with a sealing ring, the annular outer surfaces of the positioning rings are fixedly connected with first sealing rubber, the outer surface of the lower end of the flange is fixedly connected with a guide block, the outer surface of the upper end of the second flange is provided with a guide groove corresponding to the guide block, and the sealing performance is greatly improved by arranging multiple sealing means between the first flange and the second flange.)

1. A flange seal assembly, includes flange one (1), its characterized in that: the outer surface of the lower end of the first flange (1) is provided with a first sealing groove (11), the outer surface of the lower end of the first flange (1) is fixedly connected with a positioning ring (12), the outer surface of the lower end of the positioning ring (12) is fixedly connected with a squeezing ring (13), the inner part of the first sealing groove (11) is movably connected with an asbestos pad (3), the outer surface of the lower end of the first flange (1) is movably connected with a second flange (2), the positions of the second flange (2) corresponding to the asbestos pad (3) are provided with a second sealing groove (21), the positions of the second flange (2) corresponding to the positioning ring (12) are provided with positioning grooves (22), the inner surfaces of the positioning grooves (22) are provided with squeezing grooves (23), the inner parts of the squeezing grooves (23) are movably connected with sealing rings (24), the annular outer surfaces of the positioning ring (12) are fixedly connected with first sealing rubber (25), and the outer surface of the lower end of the first flange (1) is fixedly connected with a guide block (14), and a guide groove (26) is formed in the outer surface of the upper end of the second flange (2) and corresponds to the guide block (14).

2. A flange seal assembly according to claim 1 wherein: the longitudinal section of the positioning ring (12) is designed to be a conical structure, and the positioning groove (22) and the positioning ring (12) are correspondingly matched and movably connected with each other.

3. A flange seal assembly according to claim 1 wherein: the extrusion ring (13) and the longitudinal section of the extrusion groove (23) are both in rectangular structural design, the extrusion ring (13) and the extrusion groove (23) are correspondingly matched and movably connected with each other, and the longitudinal section of the sealing ring (24) is in circular structural design.

4. A flange seal assembly according to claim 1 wherein: the guide block (14) and the guide groove (26) are both designed into a rectangular structure, the guide block (14) is positioned in the guide groove (26), and the guide block and the guide groove are correspondingly matched and movably connected with each other.

5. A flange seal assembly according to claim 1 wherein: the flange I (1) and the flange II (2) are the same in size, the inside of the flange I (1) and the flange II (2) are provided with the through openings (4), the flange I (1) and the flange II (2) are provided with thread grooves at corresponding positions inside, the threads inside the thread grooves are connected with bolts through threads, and the flange I (1) and the flange II (2) are movably connected through the bolts.

6. A flange seal assembly according to claim 1 wherein: a first cavity (27) is formed in the first sealing rubber (25), a first channel (28) is formed in the flange I (1), the first end of the first channel (28) is communicated with the interior of the flange I (1), and the second end of the first channel (28) is communicated with the first cavity (27).

7. A flange seal assembly according to claim 6 wherein: the inner wall of the positioning groove (22) is provided with second sealing rubber (29), a second cavity (30) is formed in the second sealing rubber (29), a second channel (31) is formed in the second flange (2), the first end of the second channel (31) is communicated with the interior of the second flange (2), and the second end of the second channel (31) is communicated with the second cavity (30).

8. A flange seal assembly according to claim 7 wherein: first sealing rubber (25) and second sealing rubber (29) set up relatively, and first sealing rubber (25) are close to second sealing rubber (29) one side and are equipped with first sawtooth (32), and second sealing rubber (29) are close to first sealing rubber (25) one side and are equipped with second sawtooth (33), and first sawtooth (32) and second sawtooth (33) cooperate.

9. A flange seal assembly according to claim 7 wherein: the first sealing rubber (25) and the second sealing rubber (29) are arranged oppositely, a first thread is arranged on one side, close to the second sealing rubber (29), of the first sealing rubber (25), a second thread is arranged on one side, close to the first sealing rubber (25), of the second sealing rubber (29), and the first thread is matched with the second thread.

10. A flange seal assembly according to claim 7 wherein:

a first sliding block (34) is in sliding sealing fit in the first channel (28), and the first cavity (27) and a channel section of the first channel (28) between the first sliding block (34) and the first cavity (27) are filled with inert gas;

a second sliding block (35) is in sliding sealing fit in the second channel (31), and inert gas is filled in the second cavity (30) and a channel section of the second channel (31) between the second sliding block (35) and the second cavity (30).

Technical Field

The invention relates to the technical field of flanges, in particular to a flange sealing assembly.

Background

A flange for connection between pipe ends; the flange is a flange for piping in the pipeline device, and is used for tying an inlet flange and an outlet flange of the equipment, and the flange is provided with holes, and the two flanges are tightly connected by bolts.

In the process of implementing the invention, the inventor finds that at least the following problems in the prior art are not solved: 1. the flanges are often used for connecting two pipelines, the traditional flanges cannot be well positioned during butt joint, the positions of the flanges need to be continuously adjusted to enable the two flanges to correspond to each other, and the traditional adjusting process is complicated; 2. the traditional flange is additionally provided with a sealing ring at the connecting position to improve the sealing property between the flanges, and the sealing property between the flanges is difficult to ensure by a single sealing gasket when the flange is impacted by larger water flow.

To this end, a flange seal assembly is proposed.

Disclosure of Invention

The present invention is directed to a flange seal assembly that solves the problems set forth above in the background.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a flange seal assembly, includes flange one, a flange lower extreme surface has seted up seal groove one, and flange lower extreme surface fixedly connected with holding ring, the lower extreme surface fixedly connected with extrusion ring of holding ring, the inside swing joint of seal groove has the asbestos pad, flange lower extreme surface swing joint has flange two, flange two corresponds the position with the asbestos pad and has seted up seal groove two, flange two corresponds the position with the holding ring and has seted up the constant head tank, the extrusion groove has been seted up to constant head tank internal surface, the inside swing joint of extrusion groove has the sealing washer, the first sealing rubber of the equal fixedly connected with of annular surface of holding ring, flange lower extreme surface fixedly connected with guide block, the guide way has been seted up with the guide block corresponding position to flange two upper end surfaces.

Through adopting above-mentioned technical scheme, aim at the constant head tank with the holding ring of flange one, the holding ring of toper structural design can insert the constant head tank fast, the annular surface mounting of holding ring links first sealing rubber, the leakproofness between the flange is increased in the inner wall contact of first sealing rubber and constant head tank, simultaneously when the holding ring inserts the inside back of constant head tank and rotates flange one and make the guide block correspond with the guide way that flange two was seted up, flange one corresponds with flange two this moment, the user passes the bolt fastening with flange two, the extrusion ring of fixed connection at holding ring lower extreme surface moves towards the extrusion groove during fixed, resist circular sealing ring, deformation makes its internal surface contact with the extrusion groove behind the circular sealing ring atress, further improve sealed effect through first sealing rubber and sealing washer.

Preferably, the longitudinal section of the positioning ring is designed to be a conical structure, and the positioning groove and the positioning ring are correspondingly matched and movably connected with each other.

Through adopting above-mentioned technical scheme, the holding ring of toper structure can insert the constant head tank fast and make flange one fix a position with flange two fast.

Preferably, the longitudinal sections of the extrusion ring and the extrusion groove are both in rectangular structural design, the extrusion ring and the extrusion groove are correspondingly matched and movably connected with each other, and the longitudinal section of the sealing ring is in circular structural design.

By adopting the technical scheme, after the first flange is in butt joint with the second flange, the extrusion ring extrudes the sealing performance of the circular structure, so that the circular structure is deformed, and the sealing performance is further improved.

Preferably, the guide block and the guide groove are both designed in a rectangular structure, the guide block is positioned inside the guide groove, and the guide block and the guide groove are correspondingly matched and movably connected with each other.

Through adopting above-mentioned technical scheme, after flange one and flange two pass through holding ring and constant head tank preliminary location, rotatory flange one for the guide block docks with the guide way, and it is corresponding to confirm the screw hole between flange one and the flange two.

Preferably, the first flange and the second flange are the same in size and are provided with openings inside, the first flange and the second flange are provided with thread grooves at corresponding positions inside, the threads inside the thread grooves are connected with bolts in a threaded mode, and the first flange and the second flange are movably connected through the bolts.

Preferably, a first cavity is formed in the first sealing rubber, a first channel is formed in the first flange, a first end of the first channel is communicated with the first interior of the first flange, and a second end of the first channel is communicated with the first cavity.

Preferably, the inner wall of the positioning groove is provided with second sealing rubber, a second cavity is formed in the second sealing rubber, a second channel is formed in the second flange, the first end of the second channel is communicated with the interior of the second flange, and the second end of the second channel is communicated with the second cavity.

Preferably, the first sealing rubber and the second sealing rubber are arranged oppositely, first saw teeth are arranged on one side, close to the second sealing rubber, of the first sealing rubber, second saw teeth are arranged on one side, close to the first sealing rubber, of the second sealing rubber, and the first saw teeth are matched with the second saw teeth.

Preferably, the first sealing rubber and the second sealing rubber are arranged oppositely, a first thread is arranged on one side, close to the second sealing rubber, of the first sealing rubber, a second thread is arranged on one side, close to the first sealing rubber, of the second sealing rubber, and the first thread is matched with the second thread.

Preferably, the first channel is in sliding sealing fit with the first sliding block, and the first cavity and a channel section of the first channel between the first sliding block and the first cavity are filled with inert gas;

the second channel is matched with a second sliding block in a sliding and sealing mode, and the second cavity and a channel section of the second channel, which is located between the second sliding block and the second cavity, are filled with inert gas.

Compared with the prior art, the invention has the beneficial effects that:

1. the positioning ring is fixedly connected to the outer surface of the lower end of the first flange, the positioning groove is formed in the position, corresponding to the positioning ring, of the second flange, the positioning ring is designed to be of a conical structure, the positioning groove can be conveniently inserted, after the positioning groove is inserted, the positioning of the first flange and the second flange is preliminarily completed, the threaded hole is adjusted at the moment, the first flange is rotated, the guide block fixedly connected to the outer surface of the lower end of the first flange is in butt joint with the guide groove, after the butt joint is completed, the first flange and the second flange are resisted through bolts, and the flanges can be quickly butted through the structure;

2. a first sealing groove and a second sealing ring are respectively arranged at the corresponding positions of the first flange and the second flange, and an asbestos pad is movably connected inside the first sealing groove and the second sealing ring, after the butt joint is finished, the first flange and the second flange are pressed by two pairs of asbestos pads through the first sealing groove and the sealing groove, the asbestos pad is tightly attached to the first sealing groove and the second sealing groove under the extrusion of external force to form a first seal, the inclined surfaces of the outer surfaces of the positioning rings are fixedly connected with first sealing rubber, after the first flange and the second flange are in butt joint, the first sealing rubber fixedly connected with the outer surface of the positioning ring is tightly attached to the annular inner surface of the positioning groove under the pressure of the bolt to form a second seal, the extrusion ring extrudes the circular sealing ring in the extrusion groove to deform the circular sealing ring, the deformed sealing ring is in contact with the inner surface of the extrusion groove to form a third seal, and the sealing performance between the first flange and the second flange can be greatly improved through the structure.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is an overall structural view of the present invention;

FIG. 2 is an enlarged view taken at A of FIG. 1 in accordance with the present invention;

FIG. 3 is a structural view of a second flange of the present invention;

FIG. 4 is an enlarged view at B of FIG. 3 of the present invention;

FIG. 5 is a structural view of a first flange of the present invention;

FIG. 6 is an enlarged view at C of FIG. 5 of the present invention;

fig. 7 is a partial sectional view of the first sealing rubber and the second sealing rubber of the present invention.

Description of reference numerals:

1. a first flange; 11. a first sealing groove; 12. a positioning ring; 13. an extrusion ring; 14. a guide block; 2. a second flange; 21. a second sealing groove; 22. positioning a groove; 23. extruding a groove; 24. a seal ring; 25. a first sealing rubber; 26. a guide groove; 3. an asbestos pad; 4. a port; 27. a first cavity; 28. a first channel; 29. a second sealing rubber; 30. a second cavity; 31. a second channel; 32. a first saw tooth; 33. a second saw tooth; 34. a first slider; 35. and a second slider.

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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 6, the present invention provides a technical solution:

as shown in fig. 1 to 6, a flange seal assembly comprises a flange 1, wherein a first seal groove 11 is formed on the outer surface of the lower end of the flange 1, a positioning ring 12 is fixedly connected to the outer surface of the lower end of the flange 1, a squeezing ring 13 is fixedly connected to the outer surface of the lower end of the positioning ring 12, an asbestos pad 3 is movably connected to the inside of the first seal groove 11, a second flange 2 is movably connected to the outer surface of the lower end of the flange 1, a second seal groove 21 is formed in the position of the second flange 2 corresponding to the asbestos pad 3, a positioning groove 22 is formed in the position of the second flange 2 corresponding to the positioning ring 12, a squeezing groove 23 is formed in the inner surface of the positioning groove 22, a seal ring 24 is movably connected to the inside of the squeezing groove 23, first seal rubber 25 is fixedly connected to the annular outer surface of the positioning ring 12, a guide block 14 is fixedly connected to the outer surface of the lower end of the flange 1, and a guide groove 26 is formed in the position of the outer surface of the upper end of the second flange 2 corresponding to the guide block 14, the positioning ring 12 of the first flange 1 is aligned to the positioning groove 22, the positioning ring 12 with a conical structure design can be rapidly inserted into the positioning groove 22, the first sealing rubber 25 is fixedly connected to the outer annular surface of the positioning ring 12, the first sealing rubber 25 is in contact with the inner wall of the positioning groove 22 to increase the sealing performance between the flanges, meanwhile, after the positioning ring 12 is inserted into the positioning groove 22, the first flange 1 is rotated to enable the guide block 14 to correspond to the guide groove 26 formed in the second flange 2, at the moment, the first flange 1 corresponds to the second flange 2, a user fixes the first flange 1 and the second flange 2 through bolts, the extrusion ring 13 fixedly connected to the outer lower end of the positioning ring 12 moves towards the extrusion groove 23 during fixing, the circular sealing ring 24 is resisted, the circular sealing ring 24 deforms after being stressed to enable the circular sealing ring 24 to be in contact with the inner surface of the extrusion groove 23, and the sealing effect is further improved through the first sealing rubber 25 and the sealing ring 24.

Specifically, as shown in fig. 2, the longitudinal section of the positioning ring 12 is designed to be a tapered structure, the positioning groove 22 and the positioning ring 12 are correspondingly matched and movably connected, and the positioning ring 12 with the tapered structure can be quickly inserted into the positioning groove 22 to quickly position the first flange 1 and the second flange 2.

Specifically, as shown in fig. 2, longitudinal sections of the extrusion ring 13 and the extrusion groove 23 are both in a rectangular structural design, the extrusion ring 13 and the extrusion groove 23 are correspondingly matched and movably connected with each other, a longitudinal section of the sealing ring 24 is in a circular structural design, and after the first flange 1 and the second flange 2 are completely butted, the extrusion ring 13 extrudes the sealing performance of the circular structure, so that the circular structure is deformed, and the sealing performance is further improved.

Specifically, as shown in fig. 3 and 5, the guide block 14 and the guide groove 26 are both designed in a rectangular structure, the guide block 14 is located inside the guide groove 26, and the guide block and the guide groove are correspondingly matched and movably connected with each other, and after the first flange 1 and the second flange 2 are preliminarily positioned by the positioning ring 12 and the positioning groove 22, the first flange 1 is rotated, so that the guide block 14 is butted with the guide groove 26, and it is determined that the threaded holes between the first flange 1 and the second flange 2 correspond to each other.

Specifically, as shown in fig. 1, the first flange 1 and the second flange 2 have the same size, and the first flange 1 and the second flange 2 are all provided with the through opening 4 inside, the first flange 1 and the second flange 2 are provided with thread grooves at corresponding positions inside, the threads inside the thread grooves are connected with bolts, the first flange 1 and the second flange 2 are movably connected through the bolts, the first flange 1 and the second flange 2 are butted through the threaded holes through the bolts, and the through opening 4 formed inside facilitates the butt joint of the pipelines.

Specifically, as shown in fig. 3 and 5, the first sealing groove 11 and the second sealing groove 21 are correspondingly matched and movably connected with the asbestos pad 3, the asbestos pad 3 is arranged between the first sealing groove 11 and the second sealing groove 21, and the first flange 1 and the second flange 2 are butted and then are pressed against the asbestos pad 3, so that the sealing effect is improved.

The working principle is as follows: the positioning ring 12 is fixedly connected to the outer surface of the lower end of the flange I1, the positioning groove 22 is formed in the position, corresponding to the positioning ring 12, of the flange II 2, the positioning ring 12 is designed to be of a conical structure and is convenient to insert into the positioning groove 22, after the positioning groove 22 is inserted, the positioning of the flange I1 and the flange II 2 is preliminarily completed, at the moment, the threaded hole is adjusted, the flange I1 is rotated, the guide block 14 fixedly connected to the outer surface of the lower end of the flange I1 is abutted to the guide groove 26, after the abutting joint is completed, the flange I1 and the flange II 2 are tightly attached through bolts, the flange can be quickly abutted through the structure, the sealing groove I11 and the sealing groove 2 are respectively formed in the positions, corresponding to the flange I1 and the flange II 2, of the flange I1 and the sealing groove II 2, the asbestos pad 3 is movably connected inside, after the abutting joint is completed, the flange I1 and the flange II 2 exert pressure on the asbestos pad 3 through the sealing groove I11 and the sealing groove II 21, and the asbestos pad 3 is tightly attached to form a first seal under the extrusion of external force, the equal fixed connection first sealing rubber 25 of inclined plane of the surface of holding ring 12, after flange one 1 and flange two 2 butt joint are accomplished, the first sealing rubber 25 of the fixed connection of holding ring 12 surface closely laminates with the annular internal surface of constant head tank 22 under the pressure of bolt and forms the second and seals, extrusion ring 13 extrudees the inside circular seal ring 24 of extrusion groove 23, make it take place deformation, the internal surface contact of the sealing washer 24 that takes place deformation and extrusion groove 23 forms the third and seals, can improve the sealing performance between flange one 1 and the flange two 2 greatly through this structure.

The using method comprises the following steps: a user carries out primary positioning on the positions of a first flange 1 and a second flange 2 through a positioning ring 12 on the outer surface of the lower end of the first flange 1, then the first flange 1 is rotated, a guide block 14 is inserted into a guide groove 26, the first flange 1 corresponds to a threaded hole of the second flange 2, at the moment, a bolt penetrates through the threaded hole to enable the first flange 1 and the second flange 2 to be resisted and locked, a first sealing groove 11 and a second sealing groove 21 resist an asbestos pad 3 between the first sealing groove 11 and the second sealing groove 21 under the resistance of the bolt, meanwhile, a first sealing rubber 25 fixedly connected with the annular outer surface of the positioning ring 12 is in contact with the inner surface of a positioning groove 22 under the resistance of the bolt, and at the moment, a squeezing ring 13 fixedly connected with the outer surface of the lower end of the positioning ring 12 squeezes a sealing ring 24 inside a squeezing groove 23 under the action of the bolt to increase the sealing effect.

Further, referring to fig. 2, in order to improve the sealing effect, a first cavity 27 is formed inside the first sealing rubber 25, the first cavity 27 is filled inside the first sealing rubber 25, a first through hole is formed in one side, close to the positioning ring, of the first sealing rubber 25, the first through hole is communicated with the first cavity 27, the first flange 1 is provided with two first channels 28, the two first channels 28 are symmetrically arranged about the central axis of the first flange 1, first ends of the two first channels 28 are communicated with the first flange 1, second ends of the two first channels 28 are communicated with the first cavity 27, and therefore the first cavity 27 is communicated with the first flange 1 through the first channels 28. Under the working state, fluid flowing in the flange I1 enters the first cavity 27 through the first channel 28, and the fluid in the first cavity 27 has certain pressure on the first sealing rubber 25, so that the pressure between the first sealing rubber 25 and the inner wall of the positioning groove 22 is increased, and the sealing effect is better.

Further, the inner wall of the positioning groove 22 is provided with a second sealing rubber 29, a second cavity 30 is arranged inside the second sealing rubber 29, the second cavity 30 is filled with the second sealing rubber 29, one side, close to the inner wall of the positioning groove 22, of the second sealing rubber 29 is provided with a second through hole, the second through hole is communicated with the second cavity 30, the flange 2 is provided with two second channels 31, the two second channels 31 are symmetrically arranged about the central axis of the flange 2, the first ends of the two second channels 31 are communicated with the inside of the flange 2, the second ends of the two second channels 31 are communicated with the second cavity 30, and therefore the second cavity 30 is communicated with the inside of the flange 2 through the second channels 31. Under the working state, the fluid flowing in the second flange 2 enters the second cavity 30 through the second channel 31, and the fluid in the second cavity 30 has certain pressure on the second sealing rubber 29, so that the pressure between the first sealing rubber 25 and the inner wall of the positioning groove 22 is increased, and the sealing effect is better.

In the present embodiment, the first sealing rubber 25 and the second sealing rubber 29 are disposed oppositely, referring to fig. 7, a first saw tooth 32 is disposed on one side of the first sealing rubber 25 close to the second sealing rubber 29, a second saw tooth 33 is disposed on one side of the second sealing rubber 29 close to the first sealing rubber 25, and the first saw tooth 32 and the second saw tooth 33 are matched. After the first cavity 27 and the second cavity 30 are filled with the fluid, the fluid has a certain pressure on the first saw tooth 32 and the second saw tooth 33, so that the interaction force between the first saw tooth 32 and the second saw tooth 33 is increased, and the sealing effect is better.

In another design, the first sealing rubber 25 and the second sealing rubber 29 are also arranged oppositely, a first thread is arranged on one side of the first sealing rubber 25 close to the second sealing rubber 29, a second thread is arranged on one side of the second sealing rubber 29 close to the first sealing rubber 25, and the first thread and the second thread are matched. Need rotate flange one 1 or flange two 2 when flange one 1 and the cooperation installation of flange two 2 for first screw thread and second screw-thread fit, behind first screw thread and the second screw-thread fit, it is inseparabler to seal between first sealing rubber 25 and the second sealing rubber 29, and sealed effect is better.

Since the liquid or the gas having strong oxidizing property passes through the first flange 1 and the second flange 2, the first sealing rubber 25 and the second sealing rubber 29 are in contact with the liquid or the gas having strong oxidizing property for a long time, which results in that the first sealing rubber 25 and the second sealing rubber 29 are aged faster. In order to solve this problem, referring to fig. 1, a first slider 34 is slidably and hermetically fitted in the first channel 28, and the first cavity 27 and the channel section of the first channel 28 between the first slider 34 and the first cavity 27 are filled with inert gas; when fluid passes through the flange I1, the fluid enters the first channel 28, and pushes the first slider 34 to move towards the first cavity 27, but the fluid cannot pass through the first slider 34 to enter the first cavity 27, and when the first slider 34 moves towards the first cavity 27, the inert gas in the channel section of the first cavity 27 and the first channel 28 between the first slider 34 and the first cavity 27 is forced to be compressed, so that the pressure of the inert gas on the first sealing rubber 25 is increased, the sealing effect is improved, meanwhile, the first sealing rubber 25 is not contacted with the liquid or the gas with strong oxidizing property, and the first sealing rubber 25 is not aged too fast.

Similarly, a second slider 35 is slidably and hermetically fitted in the second channel 31, and the second cavity 30 and the channel section of the second channel 31 between the second slider 35 and the second cavity 30 are filled with inert gas. When fluid passes through the flange II 2, the fluid enters the second channel 31 to push the second slider 35 to move towards the second cavity 30, but the fluid cannot pass through the second slider 35 to enter the second cavity 30, and when the second slider 35 moves towards the second cavity 30, the inert gas in the channel section between the second slider 35 and the second cavity 30 of the second cavity 30 and the second channel 31 is forced to be compressed, so that the pressure of the inert gas on the second sealing rubber 29 is increased, the sealing effect is improved, meanwhile, the second sealing rubber 29 is not contacted with the liquid or the gas with strong oxidizing property, and the second sealing rubber 29 is not aged too fast.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.