CN112628500B - Flange - Google Patents

Abstract

The utility model belongs to the technical field of instrument part and specifically relates to a flange is related to, including first ring flange, the second ring flange, lock bolt and nut, first ring flange and second ring flange are parallel and are cyclic annularly, lock bolt pass behind first ring flange and the second ring flange with nut threaded connection, the flange still includes the telescoping device, first bolt and second bolt, the telescoping device is located between first ring flange and the second ring flange, the sealed butt of telescoping device one end is on first ring flange, the sealed butt of the one end that the first ring flange was kept away from to the telescoping device is on the second ring flange, the one end that the telescoping device is close to first ring flange and first ring flange all with first bolt threaded connection, the one end that the telescoping device is close to the second ring flange and second ring flange all with second bolt threaded connection. The first bolt and the second bolt can relatively fix the telescopic device between two adjacent end parts of the pipeline, and the purpose of improving the sealing performance of the pipeline joint after overhauling and reinstallation is achieved.

Description

Flange

Technical Field

The present application relates to the field of tool parts, and more particularly, to a flange.

Background

At present, the application of the flange in industry and life is wide, and the flange is used for connecting the adjacent end parts of two pipelines, so that the connection of the two pipelines can be realized through the flange.

Referring to fig. 1, the conventional flange includes a first flange 1, a second flange 2, a plurality of locking bolts 3, a nut 4 and a sealing gasket 5, the first flange 1 is annular, the second flange 2 has the same structure as the first flange 1, the first flange 1 and the second flange 2 are arranged in parallel and aligned, the caps of the locking bolts 3 are located on one side of the first flange 1 away from the second flange 2, one ends of the locking bolts 3 away from the caps penetrate through the first flange 1 and the second flange 2 and then are in threaded connection with the nut 4, the locking bolts 3 and the nuts 4 are provided in plurality, the locking bolts 3 are uniformly arranged along the circumferential direction of the first flange 1, the sealing gasket 5 is annular, two sealing gaskets 5 are provided, the two sealing gaskets 5 are located between the first flange 1 and the second flange 2, the sealing gasket 5 close to the first flange 1 is fixedly connected with the first flange 1, the sealing gasket 5 close to the second flange plate 2 is fixedly connected with the second flange plate 2. In the use, fix the fixed cover of first ring flange 1 and second ring flange 2 respectively outside two adjacent ends of two pipelines 6, then pass first ring flange 1 and second ring flange 2 with locking bolt 3, turn round the relative locking bolt 3 of nut 4 again, two seal gaskets 5 can receive the extrusion and sealed the junction of two pipelines 6 this moment.

To the above-mentioned correlation technique, will tear down nut 4 and lock bolt 3 in order to inspect the pipeline 6 junction when overhauing in the later stage, nevertheless because pipeline 6 can take place deformation after long-time the use, consequently when reinstalling, can find that the tip of two pipelines 6 has appeared certain clearance, lock bolt 3 and nut 4 will be reinstalled after the suitable seal gasket 5 of butt thickness between two seal gaskets 5 this moment generally, but because the seal gasket 5 that increases this moment only butts between two pipeline 6 tips, consequently the seal gasket 5 that increases in the follow-up use can take place the aversion, can cause the leakproofness of pipeline 6 junction to be relatively poor.

Disclosure of Invention

To improve the sealing of pipe joints after repair and reinstallation, the present application provides a flange.

The application provides a flange adopts following technical scheme:

a flange comprises a first flange plate, a second flange plate, a locking bolt and a nut, wherein the first flange plate is annular, the second flange plate has the same structure as the first flange plate, the first flange plate and the second flange plate are arranged in parallel and aligned, the bolt cap of the locking bolt is positioned on one side of the first flange plate far away from the second flange plate, one end of the locking bolt far away from the bolt cap penetrates through the first flange plate and the second flange plate and then is in threaded connection with the nut, the flange further comprises a telescopic device, a first bolt and a second bolt, the telescopic device is located between the first flange plate and the second flange plate, one end of the telescopic device is in sealing butt joint with the first flange plate, one end of the telescopic device, far away from the first flange plate, is in sealing butt joint with the second flange plate, one end of the telescopic device, close to the first flange plate, is in threaded connection with the first bolt, and one end of the telescopic device, close to the second flange plate, is in threaded connection with the second bolt.

By adopting the technical scheme, the first flange plate and the second flange plate are respectively fixedly sleeved outside two adjacent end parts of adjacent pipelines, after the pipeline is used for a long time, the flange at the joint of the two pipelines can be disassembled for maintenance, when the overhaul is finished and the pipeline is reinstalled, the distance between the adjacent end parts of the two pipelines can be changed due to the deformation of the pipelines, the length of the expansion device can be adjusted according to the distance between the adjacent end parts of the two pipelines, then the expansion device is in sealing and abutting connection between the first flange plate and the second flange plate, then the expansion device can be relatively fixed between two adjacent end parts of the pipeline by installing the first bolt and the second bolt, the position stability of the expansion device is higher at the moment, therefore, the sealing performance of the flange in the subsequent use process is better, and the purpose of improving the sealing performance of the pipeline connection part after overhauling and reinstallation is achieved.

Optionally, the telescopic device comprises a first pipe fitting, a second pipe fitting and a sealing ring, one end of the first pipe fitting is slidably sleeved outside one end of the second pipe fitting, the sealing ring is arranged in one end, close to the second pipe fitting, of the first pipe fitting, the sealing ring is sleeved outside the second pipe fitting, the first pipe fitting and the second pipe fitting are both abutted to the sealing ring, one end, far away from the second pipe fitting, of the first pipe fitting is abutted to the first flange in a sealing mode, one end, far away from the first pipe fitting, of the second pipe fitting is abutted to the second flange in a sealing mode, the first pipe fitting is in threaded connection with the first bolt, and the second pipe fitting is in threaded connection with the second bolt.

Through adopting above-mentioned technical scheme, at the in-process that the pipeline overhauld and accomplish and reinstall the flange, can be according to the interval size of first ring flange and second ring flange, the second pipe fitting slides relatively first pipe fitting, and the sealed butt of the tip that keeps away from the second pipe fitting until first pipe fitting is on first ring flange, and the sealed butt of the tip that first pipe fitting was kept away from to the second pipe fitting is on the second ring flange, consequently adjusts the length easy operation of telescoping device, has reached the purpose of convenient operation.

Optionally, a sealing groove is formed in the inner wall of the end portion, close to the second pipe, of the first pipe in the circumferential direction, and the sealing ring abuts against the inside of the first pipe through the sealing groove.

Through adopting above-mentioned technical scheme, in the use, the sealing washer can seal between first pipe fitting and second pipe fitting, and the gas or the liquid that pass through in the pipeline can not leak away from the telescoping device this moment, and at the in-process of the slip second pipe fitting of first pipe fitting relatively, the setting of seal groove can reduce the gliding possibility of first pipe fitting of sealing washer relatively to can reduce the possibility of sealing washer dislocation, reach the purpose that promotes the leakproofness of telescoping device.

Optionally, the first pipe fitting is fixedly sleeved with a first convex edge at the end far away from the second pipe fitting, and the second pipe fitting is fixedly sleeved with a second convex edge at the end far away from the first pipe fitting.

Through adopting above-mentioned technical scheme, at the in-process of adjusting telescoping device length, because the sealing washer is located the tip that first pipe fitting is close to the second pipe fitting, consequently first protruding edge and the protruding edge of second can restrict the second pipe fitting and keep away from the tip roll-off of second pipe fitting from first pipe fitting to can reduce the possibility that sealing washer and second pipe fitting break away from completely, consequently reach the purpose that further improves the leakproofness of telescoping device.

Optionally, the bolt cap of the first bolt is located on one side of the first convex edge far away from the first flange, one end of the first bolt far away from the bolt cap is in threaded connection with the first convex edge, the bolt cap of the second bolt is located on one side of the second convex edge far away from the second flange, and one end of the second bolt far away from the bolt cap is in threaded connection with the second convex edge.

Through adopting above-mentioned technical scheme, after adjusting the telescoping device to suitable length, can screw first bolt first protruding edge and first ring flange relatively, and screw second bolt protruding edge and second ring flange relatively, can fix the telescoping device relatively between first ring flange and second ring flange this moment, at the in-process that first bolt and second bolt were screwed, first bolt can make first protruding edge inseparabler with first ring flange butt, the second bolt can make the protruding edge of second inseparabler with the second ring flange butt, consequently, the purpose of the leakproofness of promotion flange has been reached.

Optionally, an elastic part is arranged at one end of the first pipe close to the second pipe, one end of the elastic part is fixedly connected with one end of the first pipe close to the second pipe, the end of the elastic part far away from the first pipe is fixedly connected with the second convex edge, and the elastic part is in a compressed state.

Through adopting above-mentioned technical scheme, the in-process of installation telescoping device between first ring flange and second ring flange, can be manual place the telescoping device between first ring flange and second ring flange, then let out the control of operating personnel to telescoping device length, the tip and the first ring flange butt of first pipe fitting can be promoted to the elastic component this moment, the tip and the second ring flange butt of second pipe fitting, then the operating personnel need not manual control telescoping device, can first bolt of direct mount and second bolt, the purpose of easy to assemble telescoping device has been reached.

Optionally, the elastic member is a spring.

Through adopting above-mentioned technical scheme, with the telescoping device butt before between first ring flange and second ring flange, because the elastic deformation ability of spring is better, consequently the power that the direction slip second pipe fitting that the operating personnel kept away from the second pipe fitting to first pipe fitting needs is less, the operation and simpler, has reached the purpose of convenient operation.

Optionally, a sliding groove is formed in the first pipe fitting along the length direction of the first pipe fitting, a sliding block is fixedly connected to the outer wall of the second pipe fitting, and the sliding block is connected with the first pipe fitting in a sliding mode through the sliding groove.

Through adopting above-mentioned technical scheme, in the actual installation, can install first bolt on offering the first protruding edge and the first ring flange of keyhole in advance to install the second bolt on offering the protruding edge of second of keyhole in advance and the second ring flange, the setting of slide and slider can make the keyhole on first protruding edge correspond with the keyhole position on the protruding edge of second, need not to rotate first pipe fitting and second pipe fitting relatively and adjust, has reached the purpose of convenient operation.

Optionally, one end of the sliding groove close to the second pipe fitting is closed at one side of the sealing ring close to the first flange.

Through adopting above-mentioned technical scheme, at the in-process of adjusting telescoping device length, the slider can't be close to the tip roll-off of second pipe fitting from the spout to can reduce the possibility that the second pipe fitting is close to the tip roll-off of second pipe fitting from first pipe fitting, and then can reduce the possibility that second pipe fitting and sealing washer break away from completely, reach the purpose that improves the leakproofness between first pipe fitting and the second pipe fitting.

Optionally, the number of the locking bolts is even, and the locking bolts are evenly distributed along the circumferential direction of the first flange plate.

Through adopting above-mentioned technical scheme, at the in-process of installation locking bolt and nut, can install two sets of locking bolts and nuts that are in diagonal position simultaneously in pairs, can adjust the position that two sets of locking bolts and nuts are connected according to the atress condition of pipeline circumference this moment to make the flange atress comparatively even, reached the purpose that promotes the flange steadiness.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by arranging the first flange plate, the second flange plate, the locking bolt, the nut, the telescopic device, the first bolt and the second bolt, the position stability of the telescopic device can be higher, so that the sealing performance of the flange in the subsequent use process is better, and the purposes of improving the sealing performance of the pipeline connection position after maintenance and reinstallation are achieved;

2. by arranging the first pipe fitting, the second pipe fitting and the sealing ring, the length of the telescopic device can be adjusted according to the distance between the first flange plate and the second flange plate, the operation for adjusting the length of the telescopic device is simple, and the purpose of convenient operation is achieved;

3. through setting up the elastic component, the elastic component can promote the tip of first pipe fitting and the tip and the second ring flange butt of first ring flange butt, second pipe fitting, and the operator can the first bolt of direct mount and second bolt, has reached the purpose of easy to assemble telescoping device.

Drawings

FIG. 1 is a side view of a prior art flange;

FIG. 2 is a perspective view of a flange of an embodiment of the present application;

fig. 3 is a cross-sectional view of a flange of an embodiment of the present application.

Description of the reference numerals: 1. a first flange plate; 2. a second flange plate; 3. locking the bolt; 4. a nut; 5. a sealing gasket; 6. a pipeline; 7. a telescoping device; 71. a first pipe member; 711. a sealing groove; 712. a first convex edge; 7121. a first seal gasket; 72. a second pipe member; 721. a second convex edge; 7211. a second gasket; 722. a slider; 73. a seal ring; 8. a first bolt; 9. a second bolt; 10. a spring.

Detailed Description

The present application is described in further detail below with reference to figures 2-3.

The embodiment of the application discloses a flange. Referring to fig. 2, the flange is used for installing between two adjacent tip of adjacent pipeline 6, the flange includes first ring flange 1, second ring flange 2 and telescoping device 7, first ring flange 1 is cyclic annular, second ring flange 2 is the same with first ring flange 1 structure, first ring flange 1 aligns the setting with second ring flange 2 parallel, first ring flange 1 and second ring flange 2 are fixed respectively and cup joint outside two adjacent tip of adjacent pipeline 6, fixed connection can be dismantled between first ring flange 1 and second ring flange 2 to telescoping device 7, the length of telescoping device 7 can be adjusted, the both ends of telescoping device 7 are sealed with first ring flange 1 and second ring flange 2 respectively. After 6 long-time uses at pipeline, can unpack the flange that is located two 6 junctions of pipeline apart and overhaul, because 6 live time of pipeline can take place to warp for a long time, consequently when overhauing the completion and reinstallating, can discover that can produce certain space between two 6 adjacent tip of pipeline, can adjust the length alright accomplish the installation of flange again of telescoping device 7 this moment.

Referring to fig. 2, the flange further comprises locking bolts 3 and nuts 4, the bolt caps of the locking bolts 3 are located on one side, away from the second flange plate 2, of the first flange plate 1, one ends, away from the bolt caps, of the locking bolts 3 penetrate through the first flange plate 1 and the second flange plate 2 and then are in threaded connection with the nuts 4, the locking bolts 3 are arranged in a plurality, and the locking bolts 3 are evenly distributed along the first flange plate 1 in the circumferential direction. In use, the nuts 4 can be tightened against the locking bolts 3, so that the first flange plate 1 and the second flange plate 2 can be fixed relatively.

Referring to fig. 2, the number of the locking bolts 3 is eight, and in the process of installing the locking bolts 3 and the nuts 4, the two groups of locking bolts 3 and the nuts 4 which are positioned at opposite angle positions can be installed in pairs at the same time, and the positions where the two groups of locking bolts 3 and the nuts 4 are connected can be adjusted according to the circumferential stress condition of the pipeline 6, so that the stress of the flange is uniform, and the purpose of improving the stability of the flange is achieved.

Referring to fig. 3, the flange further includes a first bolt 8 and a second bolt 9, one end of the expansion device 7 close to the first flange plate 1 and the first flange plate 1 are both in threaded connection with the first bolt 8, and one end of the expansion device 7 close to the second flange plate 2 and the second flange plate 2 are both in threaded connection with the second bolt 9. After pipeline 6 used for a long time, can unpack the flange that is located two pipeline 6 junctions apart and overhaul, when overhauing and accomplishing and reinstallating, the interval size of two pipeline 6 adjacent tip can be because pipeline 6 warp and change, can adjust the length of telescoping device 7 according to the interval size of two pipeline 6 adjacent tip this moment, then seal the butt of telescoping device 7 between first ring flange 1 and second ring flange 2, then install first bolt 8 and second bolt 9 and just can fix telescoping device 7 relatively between two adjacent tip of pipeline 6, the position stability of telescoping device 7 is higher this moment, thereby make the flange better in follow-up use, reached the purpose that improves the leakproofness after pipeline 6 junction overhauls and reinstallates.

Referring to fig. 3, the telescopic device 7 includes a first pipe 71, a second pipe 72 and a sealing ring 73, the first pipe 71 and the second pipe 72 are both in a circular tube shape, one end of the first pipe 71 is slidably sleeved outside one end of the second pipe 72, the sealing ring 73 is disposed in one end of the first pipe 71 close to the second pipe 72, the sealing ring 73 is sleeved outside the second pipe 72, the first pipe 71 and the second pipe 72 are both abutted to the sealing ring 73, one end of the first pipe 71 far away from the second pipe 72 is abutted to the first flange 1 in a sealing manner, one end of the second pipe 72 far away from the first pipe 71 is abutted to the second flange 2 in a sealing manner, the first pipe 71 is in threaded connection with the first bolt 8, and the second pipe 72 is in threaded connection with the second bolt 9. In the process of completing overhaul of the pipeline 6 and reinstalling the flange, the second pipe fitting 72 can slide relative to the first pipe fitting 71 according to the distance between the first flange plate 1 and the second flange plate 2 until the end part of the first pipe fitting 71 far away from the second pipe fitting 72 is in sealing butt joint with the first flange plate 1, and the end part of the second pipe fitting 72 far away from the first pipe fitting 71 is in sealing butt joint with the second flange plate 2, so that the length operation of the telescopic device 7 is simple to adjust, and the purpose of convenient operation is achieved.

Referring to fig. 3, a seal groove 711 is formed in an inner wall of an end portion of the first pipe 71 close to the second pipe 72 in the circumferential direction, and the seal ring 73 abuts against the inside of the first pipe 71 through the seal groove 711. In the using process, the sealing ring 73 can seal between the first pipe fitting 71 and the second pipe fitting 72, at the moment, gas or liquid passing through the pipeline 6 cannot leak out of the telescopic device 7, and in the process of sliding the second pipe fitting 72 relative to the first pipe fitting 71, the arrangement of the sealing groove 711 can reduce the possibility that the sealing ring 73 slides relative to the first pipe fitting 71, so that the possibility of dislocation of the sealing ring 73 can be reduced, and the purpose of improving the sealing performance of the telescopic device 7 is achieved.

Referring to fig. 3, a first convex edge 712 is fixedly sleeved outside an end of the first tube 71 away from the second tube 72, a second convex edge 721 is fixedly sleeved outside an end of the second tube 72 away from the first tube 71, the first convex edge 712 and the second convex edge 721 are both annular, the first convex edge 712 abuts against one side of the first flange 1 away from the second flange 2, and the second bolt 9 abuts against one side of the second flange 2 away from the first flange 1. In the process of adjusting the length of the telescopic device 7, because the sealing ring 73 is located at the end of the first pipe 71 close to the second pipe 72, the first protruding edge 712 and the second protruding edge 721 can limit the second pipe 72 from sliding out of the end of the first pipe 71 far from the second pipe 72, so that the possibility that the sealing ring 73 is completely separated from the second pipe 72 can be reduced, and the purpose of further improving the sealing performance of the telescopic device 7 is achieved.

Referring to fig. 3, the cap of the first bolt 8 is located on the side of the first flange 712 away from the first flange 1, the first flange 712 and the first flange 1 are both in threaded connection with the end of the first bolt 8 away from the cap, the cap of the second bolt 9 is located on the side of the second flange 721 away from the second flange 2, and the second flange 721 and the second flange 2 are both in threaded connection with the end of the second bolt 9 away from the cap. After the expansion device 7 is adjusted to a proper length, the first bolt 8 can be screwed with respect to the first flange 712 and the first flange 1, and the second bolt 9 can be screwed with respect to the second flange 721 and the second flange 2, at this time, the expansion device 7 can be relatively fixed between the first flange 1 and the second flange 2, during the screwing process of the first bolt 8 and the second bolt 9, the first bolt 8 can make the first flange 712 and the first flange 1 abut against each other more tightly, and the second bolt 9 can make the second flange 721 and the second flange 2 abut against each other more tightly, so that the purpose of improving the sealing performance of the flange is achieved.

Referring to fig. 3, a first sealing gasket 7121 is arranged between the first convex edge 712 and the first flange 1, a second sealing gasket 7211 is arranged between the second convex edge 721 and the second flange 2, the first sealing gasket 7121 and the second sealing gasket 7211 are both annular, the first sealing gasket 7121 is fixedly connected with the first convex edge 712, and the second sealing gasket 7211 is fixedly connected with the second convex edge 721. In use, when the first bolt 8 is tightened, the first sealing gasket 7121 can be clamped between the first flange 1 and the first protruding edge 712, and when the second bolt 9 is tightened, the second sealing gasket 7211 can be clamped between the second protruding edge 721 and the second flange 2, so that the sealing effect at the joint of the first flange 1 and the expansion device 7 and the joint of the second flange 2 and the expansion device 7 can be better.

Referring to fig. 3, an elastic member is disposed at an end of the first pipe 71 close to the second pipe 72, one end of the elastic member is fixedly connected to an end of the first pipe 71 close to the second pipe 72, an end of the elastic member far from the first pipe 71 is fixedly connected to the second protruding edge 721, and the elastic member is in a compressed state. At the in-process of installation telescoping device 7 between first ring flange 1 and second ring flange 2, can manually put telescoping device 7 between first ring flange 1 and second ring flange 2, then let out the control of operating personnel to telescoping device 7 length, the tip and the first ring flange 1 butt of first pipe fitting 71 can be promoted to the elastic component this moment, the tip and the second ring flange 2 butt of second pipe fitting 72, then the operating personnel need not manual control telescoping device 7, can first bolt 8 of direct mount and second bolt 9, the purpose of telescoping device 7 has been reached to the ready-to-mount.

Referring to fig. 3, the elastic member is a spring 10 in a compressed state. Before the expansion device 7 is abutted between the first flange plate 1 and the second flange plate 2, the elastic deformation capacity of the spring 10 is good, so that the force required by an operator to slide the second pipe 72 in the direction that the first pipe 71 is far away from the second pipe 72 is small, the operation is simpler, and the purpose of convenient operation is achieved.

Referring to fig. 3, a sliding groove is formed in the first pipe fitting 71 along the length direction of the first pipe fitting 71, the outer wall of the second pipe fitting 72 is fixedly connected with the sliding blocks 722, the sliding blocks 722 are connected with the first pipe fitting 71 in a sliding mode through the sliding groove, the sliding blocks 722 and the sliding groove are both provided with two sliding blocks, the two sliding blocks 722 are uniformly distributed along the circumferential direction of the second pipe fitting 72, the two sliding grooves are uniformly distributed along the circumferential direction of the first pipe fitting 71, and one sliding block 722 is matched with one sliding groove for use. In the actual installation process, the first bolt 8 is installed on the first convex edge 712 and the first flange 1, which are pre-provided with the bolt holes, and the second bolt 9 is installed on the second convex edge 721 and the second flange 2, which are pre-provided with the bolt holes, and the arrangement of the slide way and the slide block 722 can enable the bolt holes of the first convex edge 712 and the second convex edge 721 to correspond to each other, so that the adjustment is performed without relatively rotating the first pipe 71 and the second pipe 72, and the purpose of convenient operation is achieved.

Referring to fig. 3, the sliding groove is located on one side of the sealing ring 73 close to the first flange 1, and one end of the sliding groove close to the second pipe 72 is closed. In the process of adjusting the length of the telescopic device 7, the sliding block 722 cannot slide out of the end part of the sliding groove close to the second pipe fitting 72, so that the possibility that the second pipe fitting 72 slides out of the end part of the first pipe fitting 71 close to the second pipe fitting 72 can be reduced, the possibility that the second pipe fitting 72 and the sealing ring 73 are completely separated can be reduced, and the purpose of improving the sealing performance between the first pipe fitting 71 and the second pipe fitting 72 is achieved.

The implementation principle of a flange in the embodiment of the application is as follows: after the pipeline 6 is used for a long time, the flange at the joint of the two pipelines 6 can be detached for maintenance, the pipeline 6 can be deformed when being used for a long time, when the maintenance is finished and the pipeline 6 is reinstalled, the change of the distance between the adjacent end parts of the two pipelines 6 due to the deformation of the pipeline 6 can be found, the second pipe 72 can slide relative to the first pipe 71 according to the distance between the adjacent end parts of the two pipelines 6, so as to adjust the length of the expansion device 7, then the two ends of the first pipe 71, which are far away from the second pipe 72, are respectively abutted between the first flange 1 and the second flange 2 in a sealing manner, then the expansion device 7 can be relatively fixed between the two adjacent end parts of the pipeline 6 by installing the first bolt 8 and the second bolt 9, the position stability of the expansion device 7 is higher, so that the sealing performance is better in the subsequent use process of the flange, the purpose of improving the sealing performance of the pipeline 6 joint after overhauling and reinstalling is achieved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (4)

1. The utility model provides a flange, including first ring flange (1), second ring flange (2), locking bolt (3) and nut (4), first ring flange (1) is cyclic annular, second ring flange (2) are the same with first ring flange (1) structure, first ring flange (1) and second ring flange (2) parallel alignment setting, the bolt cap of locking bolt (3) is located one side that second ring flange (2) were kept away from in first ring flange (1), the one end of bolt cap is kept away from in locking bolt (3) pass behind first ring flange (1) and second ring flange (2) with nut (4) threaded connection, its characterized in that: the flange further comprises a telescopic device (7), a first bolt (8) and a second bolt (9), the telescopic device (7) is located between the first flange plate (1) and the second flange plate (2), one end of the telescopic device (7) is in sealing butt joint with the first flange plate (1), one end of the telescopic device (7) far away from the first flange plate (1) is in sealing butt joint with the second flange plate (2), one end of the telescopic device (7) close to the first flange plate (1) and the first flange plate (1) are in threaded connection with the first bolt (8), and one end of the telescopic device (7) close to the second flange plate (2) and the second flange plate (2) are in threaded connection with the second bolt (9);

the telescopic device (7) comprises a first pipe fitting (71), a second pipe fitting (72) and a sealing ring (73), one end of the first pipe fitting (71) is slidably sleeved outside one end of the second pipe fitting (72), the sealing ring (73) is arranged in one end, close to the second pipe fitting (72), of the first pipe fitting (71), the sealing ring (73) is sleeved outside the second pipe fitting (72), the first pipe fitting (71) and the second pipe fitting (72) are both abutted to the sealing ring (73), one end, far away from the second pipe fitting (72), of the first pipe fitting (71) is abutted to the first flange plate (1) in a sealing mode, one end, far away from the first pipe fitting (71), of the second pipe fitting (72) is abutted to the second flange plate (2) in a sealing mode, the first pipe fitting (71) is in threaded connection with the first bolt (8), and the second pipe fitting (72) is in threaded connection with the second bolt (9);

a sealing groove (711) is formed in the inner wall of the end part, close to the second pipe (72), of the first pipe (71) along the circumferential direction, and the sealing ring (73) abuts against the inside of the first pipe (71) through the sealing groove (711);

a first convex edge (712) is fixedly sleeved outside one end, far away from the second pipe fitting (72), of the first pipe fitting (71), and a second convex edge (721) is fixedly sleeved outside one end, far away from the first pipe fitting (71), of the second pipe fitting (72);

the bolt cap of the first bolt (8) is positioned on one side, away from the first flange plate (1), of the first convex edge (712), one end, away from the bolt cap, of the first bolt (8) is in threaded connection with the first convex edge (712), the bolt cap of the second bolt (9) is positioned on one side, away from the second flange plate (2), of the second convex edge (721), and one end, away from the bolt cap, of the second bolt (9) is in threaded connection with the second convex edge (721); a first sealing gasket 7121 is arranged between the first convex edge 712 and the first flange plate 1, a second sealing gasket 7211 is arranged between the second convex edge 721 and the second flange plate 2, and the first sealing gasket 7121 and the second sealing gasket 7211 are both annular;

an elastic part is arranged at one end, close to the second pipe fitting (72), of the first pipe fitting (71), one end of the elastic part is fixedly connected with one end, close to the second pipe fitting (72), of the first pipe fitting (71), the end, far away from the first pipe fitting (71), of the elastic part is fixedly connected with the second convex edge (721), the elastic part is in a compression state, and the elastic part is a spring (10).

2. The flange of claim 1, wherein: the sliding groove is formed in the first pipe fitting (71) along the length direction of the first pipe fitting (71), the sliding block (722) is fixedly connected to the outer wall of the second pipe fitting (72), and the sliding block (722) is connected with the first pipe fitting (71) in a sliding mode through the sliding groove.

3. The flange of claim 2, wherein: one end of the sliding groove, which is close to the second pipe fitting (72), is sealed at one side, which is close to the first flange plate (1), of the sealing ring (73).

4. The flange of claim 1, wherein: the locking bolts (3) are arranged in an even number, and the locking bolts (3) are evenly distributed along the circumferential direction of the first flange plate (1).

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