CN211693902U - Flange loose joint - Google Patents

Abstract

The utility model provides a flange loose joint, is including the expansion joint spare and the flange head that communicate each other, still including setting up the deformation recovery unit in the expansion joint spare periphery. The utility model discloses a flange head connects the telescopic connection spare between the pipeline in the train, utilizes telescopic connection spare to absorb the deflection of pipeline expend with heat and contract with cold to when telescopic connection spare absorbs the deflection and produces deformation, the synchronous deformation recovery unit that sets up through the telescopic connection spare periphery provides the stress of its deformation recovery of drive for telescopic connection spare. The utility model discloses can absorb originally because of the pipeline deformation acts on the stress that the pipe joint was connected, guarantee that pipe-line system and flange loose joint itself do not receive the flexible influence of deformation, guarantee that it appears warping or pine takes off at train operation process to guarantee that the pipe-line system of train is connected with the straight line mode all the time, can effectively protect the pipeline.

Description

Flange loose joint

Technical Field

The utility model relates to a rail vehicle spare part field especially relates to a flange loose joint.

Background

The pipeline on the train expands when heated and contracts when cooled. Because the train has a large running distance span and the temperature difference of the running environment of the train is obvious in the running process, the deformation of the pipeline is large in the running process. For a stainless steel pipe with the length of 1m, the expansion and contraction amount of the stainless steel pipe is usually 0.35-0.38 mm in the running process of a train. Every steel pipe length sets up to 6m in the train, and the expend with heat and contract with cold flexible volume between the whole car steel pipe just can reach 5 ~ 8 millimeters.

Because the pipeline on the train does not have stress absorbing structure or can hold the space of deformation itself, the flexible volume of whole car 5 ~ 8 millimeters can only release on the loose joint that connects between the pipeline. The movable joint needs to bear the vibration of a train in the running process of the train and also needs to receive the stretching or the compression of the expansion with heat and the contraction with cold of a train pipeline, so that the movable joint is easy to deform or loosen, a medium in the pipeline is leaked, and the running of the train is influenced.

I have designed the first generation expansion loose joint to the above-mentioned condition, it absorbs the train pipeline expend with heat and contract with cold deflection through the expansion joint spare that sets up between the coupling of pipe connector spare. However, the telescopic connector of this structure is insufficient in mechanical strength, rigidity or deformation resistance because it needs to provide a telescopic deformation amount. The long-term use can lead to the deformation or damage of the telescopic connecting pieces such as the corrugated pipe and the like, and the leakage of the circulating medium in the pipe is caused in serious cases. If the deformation cannot be recovered in time, the pipelines connected to the two ends of the structure are easy to displace, and the sealing degree of pipeline connection is affected. And the movable joint of the pipe connector is screwed in a thread way, so that the installation is complicated.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects existing in the prior art, the utility model aims to provide a flange loose joint. This application is through increasing the deformation recovery unit on telescopic connection spare, can protect the train pipeline can the accuracy resume linear state, avoid shifting when the union of protection pipeline and pipeline itself does not receive the stress influence that the environment caused.

In order to achieve the above object, the utility model provides a flange loose joint, it includes:

the telescopic connecting piece is hollow inside;

the flange heads are respectively arranged at the end parts of the two sides of the telescopic connecting piece;

the device further comprises a deformation recovery device which is arranged on the periphery of the telescopic connecting piece, and the end parts of the two ends of the deformation recovery device are respectively connected with the flange heads at the two ends of the telescopic connecting piece.

Optionally, the flange is movably connected, wherein the deformation recovery device is a spring device with two ends respectively fixedly connected to flange heads at two ends of the telescopic connecting piece, and the spring device has elasticity for driving the telescopic connecting piece to deform and recover.

Optionally, the flange is movably connected, wherein the telescopic connecting piece is a metal corrugated pipe, and a pipe wall of the metal corrugated pipe is a single layer or a double layer.

Optionally, in any one of the above flange loose joints, a sheath is further sleeved between the telescopic connecting piece and the deformation recovery device, and two ends of the sheath are respectively fixedly connected to flange heads at two ends of the telescopic connecting piece.

Optionally, the flange loose joint is any one of the above, wherein the sheath is a metal woven sleeve, a protective layer is further disposed between the metal woven sleeve and the telescopic connecting piece inside the metal woven sleeve, and the protective layer blocks the metal woven sleeve from directly contacting the telescopic connecting piece.

Optionally, the flange loose joint is any one of the above, wherein a connection transition joint is welded between the telescopic connecting piece and the flange head, an inner ring of the connection transition joint is welded and sealed with the telescopic connecting piece, and an outer ring of the connection transition joint is welded and fixed with the sheath and the deformation recovery device sleeved outside the sheath.

Optionally, the flange is movably connected, wherein the flange head comprises a pipe connection body and a triangular plate; the set square sets up the outside end at the pipe connection body, set square and pipe connection body integrated into one piece, or the set square is rotationally the butt fixed through flange joint boss and the pipe connection body that sets up on the pipe connection body periphery.

Optionally, in any of the above flange loose joints, an end face of the pipe connection body on one side of the connection triangle to which the triangle is connected is provided with a limit outer ring or a limit inner ring corresponding to another flange head, the limit outer ring is recessed inward, the limit inner ring protrudes outward, and the limit inner ring abuts against the limit outer ring of another flange head.

Optionally, in any of the above flange loose joints, a first sealing groove is arranged on the limiting outer ring; a second sealing groove is formed in the limiting inner ring; a gasket is abutted between the limiting outer ring and the limiting inner ring, and a first bulge corresponding to the first sealing groove and a second bulge corresponding to the second sealing groove are respectively arranged on the end surfaces of two sides of the gasket; the cross section of the first sealing groove is different from that of the second sealing groove, and the cross section of the first protrusion and the cross section of the second protrusion are respectively rectangular or arc-shaped matched with the cross section of the first sealing groove and the cross section of the second sealing groove in size.

Optionally, the flange loose joint may further include a positioning outer ring disposed inside the limiting outer ring at an end of the inner wall of the pipe connection body connected to one side of the triangular plate, or a positioning inner ring corresponding to another flange head disposed inside the limiting inner ring at an end of the inner wall of the pipe connection body connected to one side of the triangular plate, wherein the positioning outer ring is recessed inward, the positioning inner ring protrudes outward, and the positioning inner ring abuts against the positioning outer ring of the other flange head.

Compared with the prior art, the utility model has the following technical effects:

1. the utility model provides a flange loose joint, it is connected between the pipeline of train through the flange head, absorbs the deformation volume of pipeline expend with heat and contract with cold through the telescopic connection spare between the flange head to guarantee through the outside deformation recovery unit around telescopic connection spare that the pipeline remains throughout and connect with the straight line mode. The flange head makes the utility model provides a flange loose joint can realize the fixed to two flange heads through simple fastener. Especially, the utility model discloses the simple fastener of accessible through peg graft between the flange head the fastener even exert the effort to two flange heads and guarantee that it connects fixedly, realizes the restriction to the removal of radial or circumference between the flange head. Compared with the conventional threaded fastener which is integrally sleeved on the outer ring of the union joint of the pipe connecting piece, the threaded fastener can be uniformly fixed by the fasteners distributed in the circumferential direction of the flange head, so that the local extrusion of the union structure caused by the dislocation of the threads is avoided, and the deformation and the damage of the gasket caused by the extrusion of the gasket in the flange head are avoided.

2. Further, for the recovery effect of the produced deformation volume of assurance pipeline all directions, the utility model discloses set up deformation recovery unit into the spring structure who surrounds in the telescopic connection outside. The end parts of the two sides of the spring structure are connected with the telescopic connecting piece on the flange head together, so that the deformation stress borne by the spring structure and the telescopic connecting piece are completely restored to the initial linear state, and the flange heads at the two ends of the spring structure are accurately driven to be in telescopic connection with each other. The elasticity that spring structure itself has can be accurate drive spring when taking place deformation the connecting piece resumes the straight line state. Therefore, the telescopic connecting piece can not be bent due to the telescopic amount of the pipeline. Therefore, the utility model discloses can avoid the pipeline to buckle to the resistance of inside circulation medium, and, especially, the utility model discloses can avoid telescopic connector to receive external force friction or extrusion because of buckling the salient on the pipeline, the protection pipeline can not be damaged.

3. For guaranteeing the connection that the flange loose joint can be reliable is on the pipeline to make can be convenient between the flange head connect fixedly, the utility model discloses it is fixed to peg graft the flange head at flange loose joint both ends through the bolt that sets up on peripheral set-square. And rotation between the relative inside pipe connection body is realized to set-square accessible flange joint boss itself, therefore, can be through the rotation to the set-square, conveniently adjust the installation angle of flange head in narrow and small space, conveniently twist and connect fasteners such as bolts of different positions, realize the reliable sealing connection between the flange head. The installation mode can avoid rotating the pipeline connected with the flange loose joint or rotating the flange loose joint in the installation process and avoid damaging the pipeline in the rotation process.

4. Still further, the utility model discloses still can set up spacing inner circle, spacing outer lane at flange head end and realize the sealed to the flange loose joint through setting up the seal groove on its surface. The positioning inner ring and the positioning outer ring can be further arranged in the limiting inner ring and the limiting outer ring. The tip periphery through setting up the location inner circle has the radian, the utility model discloses direction when the radian of this radian cooperation location outer lane inner wall of accessible realizes flange head structure installation can easy to assemble. Meanwhile, the limit of the depth of the mounting and fastening position between the flange heads is realized through the abutting action between the limiting inner ring and the limiting outer ring. Therefore, the utility model discloses can avoid installing the packing ring between the too tight extrusion seal groove, the protection packing ring is in comparatively ideal installation environment and operational environment all the time. The utility model provides a flange loose joint, its life is longer, and is also more reliable and more stable to the sealed of pipeline, can also be in under comparatively ideal linear state through the absorption to pipeline stress and spring assembly's reaction further protection pipeline to further promote whole pipe-line system's life.

5. For further protecting the pipeline, the utility model discloses still can set up flexible connecting piece into bilayer structure to it provides the protection to set up the metal braided sleeve in bilayer structure's outside. For avoiding rubbing each other in deformation in-process between the part, the utility model discloses still can further form the protective layer through materials such as asbestos, weave the protective layer setting at the metal between cover and its inside telescopic connection spare, separation metal weave cover and telescopic connection spare direct contact.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, together with the embodiments of the invention for the purpose of explanation and not limitation of the invention. In the drawings:

figure 1 is a schematic view of the overall structure of a flange loose joint according to the present invention

FIG. 2 is a perspective view of the flange loose joint of the present invention;

FIG. 3 is a schematic view of a flange head in a flange loose joint according to the present invention in a connected state;

FIG. 4 is a schematic view of the flange head in the flange loose joint of the present invention in the connection mode;

fig. 5 is a side view of a flange head in the flange loose joint of the present invention.

In the drawings, 1 denotes a flange head; 2 denotes a connecting transition section; 3 denotes a telescopic link; 4 represents the outer ring of the connecting transition section; 5 denotes a set square; 6 denotes a sheath; 7 denotes a protective layer; 8 denotes deformation recovery means; 511 denotes a first seal groove; 512 denotes a positioning outer ring; 513 denotes a pipe connection end of the first flange head; 514 represents a limit outer ring; 521 denotes a second seal groove; 522 denotes positioning the inner ring; 523 denotes a pipe connection end of the second flange head; 524 denotes a limit inner ring; 53 denotes a second flange connection; 531 denotes a second mounting through-hole; 54 denotes a first flange connection; 541 denotes a first mounting through hole; 45 denotes a flange connection boss; 9 denotes a gasket; 91 denotes a first projection; and 92, a second projection.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

The meaning of "and/or" in the present invention means that they exist individually or both at the same time.

The meaning of "inside and outside" in the present invention means that, for the flange loose joint, the direction from the external deformation recovery device to the internal medium of the flange loose joint pipeline is inside, otherwise, the direction is outside; and not to the specific limitations of the device mechanism of the present invention.

The term "connected" as used herein may mean either a direct connection between elements or an indirect connection between elements through other elements.

The utility model provides a flange loose joint, refer to fig. 1 and fig. 2 and show, it includes:

the telescopic connecting piece 3 is hollow inside and can seal the medium or gas circulating in the pipelines at two ends;

the flange heads 1 are respectively arranged at the end parts of two sides of the telescopic connecting piece 3;

it still includes:

and the deformation recovery device 8 is arranged on the periphery of the telescopic connecting piece 3, and the end parts of the two ends of the deformation recovery device are respectively connected with the flange heads at the two ends of the telescopic connecting piece 3.

Therefore, the flange head and the telescopic connecting piece 3 are communicated with each other so as to facilitate the circulation of media or gas conveyed in the pipelines at the two ends. And, simultaneously, make the utility model discloses a flange loose joint can be through the flange head with the telescopic connection piece connect between the pipeline in the train, utilize telescopic connection piece to absorb the deflection of pipeline expend with heat and contract with cold to when telescopic connection piece absorbed the deflection and produced deformation, synchronous through setting up the stress that provides its deformation of drive and resume at the deformation recovery device of telescopic connection piece periphery for telescopic connection piece. Therefore, the utility model discloses can absorb originally because of the pipeline deformation acts on the stress of union, guarantee that pipe-line system and flange union itself do not receive the flexible influence of deformation, guarantee that it is out of shape or pine takes off at train operation process disappearance. The utility model discloses especially, the pipe-line system that can guarantee the train is connected with the straight line mode all the time to avoid the pipeline deformation damaged, effectively protect the pipeline.

The deformation recovery device 8 may be a spring, especially a spring device such as a tension spring. The elastic device can be specifically set to be fixedly connected to flange heads at two ends of the telescopic connecting piece 3 at two ends respectively. Since the elastic means is elastic and is connected to the telescopic links together via the flange heads, said elastic means can be synchronously stretched, rotated or deformed along with the telescopic links, whereas since the elastic means itself has elasticity which enables the elastic means to return to its original linear state, the elastic means can drive the telescopic links 3 synchronously via the flange heads, restoring the deformation of the telescopic links via the elasticity of the elastic means.

To ensure the restoring effect on the deformation of the telescopic connection, the elastic device is preferably arranged to surround the telescopic connection by one turn. Whereby a spring force may be provided in all directions to urge the telescopic links back to the original linear condition. Specifically, the elastic device can be set as a spring with a larger inner diameter, and the spring surrounds and is sleeved on an outer ring of the telescopic connecting piece; or, the elastic device can also be set into a plurality of groups of springs with smaller size, and the springs are uniformly distributed around the periphery of the telescopic connecting piece, so that the telescopic connecting piece is provided with driving force for recovering the linear state of the telescopic connecting piece in each direction.

The utility model discloses in, telescopic connection 3 specifically can choose to realize through corrugated metal pipe. The wall of the metal corrugated pipe can be arranged as a single layer. Considering that the stainless steel corrugated pipe is thin, the utility model discloses still set up the tubular metal resonator as double-deck or even multilayer with further to increase its mechanical strength and with bearing the weight of 40kpa pressure in the pipeline or correspond the pipe pressure of at least 60 kilograms, prevent to damage.

For further protection bellows, the utility model discloses can also be under more preferred implementation the flexible connecting piece 3 and deformation resume to set up sheath 6 between the device 8, and will the both ends of sheath 6 respectively with the flange head fixed connection at flexible connecting piece 3 both ends in order to guarantee its and resilient means and bellows synchronous motion. The sheath 6 may in particular be provided as a metal braided sheath. The metal weaving sleeve is provided with holes, and the metal wires between the holes can absorb the telescopic stress synchronously along with the stretching or compressing of the corrugated pipe, so that the corrugated pipe inside the metal weaving sleeve is effectively protected, and the collision or impact of external foreign matters is avoided. Meanwhile, the pores of the metal woven sleeve can also allow rainwater and various gases in the environment to pass through, so that the phenomenon that the rainwater and various gases are accumulated on the wall of the corrugated pipe to corrode the pipe body is avoided. For further corrugated pipe pine takes off in this flange loose joint and provides the sealing effect to intraductal medium when revealing temporarily, the utility model discloses still can wrap up rubber protective sleeve in the outside of metal braiding cover, act as the pipeline that supplies the medium circulation temporarily by rubber protective sleeve, avoid the train to be forced the bring to rest because of the pipeline trouble.

And in order to avoid the metal to weave between cover and its inside telescopic connector 3 at flange loose joint deformation removal in-process looks mutual friction, the utility model discloses still can further set up the protective layer 7 of materials such as asbestos between the two. The protective layer 7 can prevent the metal woven sleeve from directly contacting with the telescopic connecting piece 3, and further protect the corrugated pipe.

In some implementations, referring to fig. 2 and 3, the connection between the telescopic connection member 3 and the flange head may be provided by a connection transition joint. Connect transition section 2 welding between telescopic connection 3 and flange head, it is concrete, connect the interior week of transition section 2 and pass through between welding mode and the telescopic connection 3 sealed, connect the deformation recovery device 8 fixed connection that the periphery of transition section 2 cup jointed through welding mode and sheath 6 outside. The inner layer is made of bellows, the outer sheath and the end of the elastic device surrounded by the sheath are all connected and fixed by the connecting transition joint 2, therefore, the three are connected with each other to form a whole synchronous rotation, stretching, contraction or bending, and the elastic device acts synchronously to restore to the linear state.

The utility model discloses in set up the flange head at flange loose joint both ends, it can refer to the mode that figure 3 and figure 4 show, sets up to including pipe connection body and set-square 5. The triangular plate 5 is arranged at the outer end of the pipe connection body in a similar manner to that shown in fig. 5. Wherein the triangle 5 can be integrally formed with the pipe connection body as shown in the left side of fig. 4; alternatively, as shown in the right side of fig. 4, the triangular plate 5 may be rotatably connected to the pipe connecting body by a flange connection boss 45 provided on the outer periphery of the pipe connecting body, so that the inner ring of the triangular plate 5 rotatably abuts on the flange connection boss 45 to fix the flange head.

Referring to fig. 4, the end surface of the pipe connection body on the side of the triangle 5 may be further provided with a limiting outer ring 514 or a limiting inner ring 524 corresponding to the other flange head 1, the limiting outer ring 514 is recessed inward, the limiting inner ring 524 protrudes outward, and the limiting inner ring 524 abuts against the limiting outer ring 514 of the other flange head.

In order to further realize the sealing between the flange heads, in a more preferred implementation, a first sealing groove 511 may be further disposed on the limiting outer ring 514, and a second sealing groove 521 is correspondingly disposed on the limiting inner ring 524. Thereby, the washer 9 can be disposed in contact with the stopper outer ring 514 and the stopper inner ring 524. In addition, since the outer peripheral surface of the stopper inner ring 524 can be fitted to the inner peripheral surface of the stopper outer ring 14, this structure can restrict the washer 9 from being fixed only in the cavity space formed between the stopper ring and the retainer ring. In order to match the two sealing grooves, the gasket 9 may be provided with a first protrusion 91 corresponding to the first sealing groove 511 and a second protrusion 92 corresponding to the second sealing groove 521 on two side end surfaces thereof, respectively. The cross-sectional shape of first sealing groove 511 and the cross-sectional shape of second sealing groove 521 may be different. Specifically, one of the cross-section of the first projecting portion 91 and the cross-section of the second projecting portion 92 may be provided in a rectangular shape, and the other may be provided in an arc shape. Corresponding to the cross section of each projection, the cross section of the first seal groove 511 to be abutted with the first projection 91 and the cross section of the second seal groove 521 to be abutted with the second projection 92 may be respectively provided in a rectangular shape or an arc shape in which the dimensions are fitted to each other. The rectangular bulge abuts against the rectangular sealing groove, and the arc-shaped bulge abuts against the arc-shaped sealing groove. From this, curved seal groove and bulge can provide the direction, make things convenient for flange head butt joint installation, and the bulge of rectangle can be when thermal expansion further inside and outside both sides inseparable butt fully fill the seal groove again, and can not slide in the seal groove. Therefore, the utility model discloses can the first structure of make full use of flange guarantee flange loose joint firm in connection and guarantee that whole pipeline is sealed.

For further providing the direction in the equipment process to the flange head to the degree of depth of pegging graft is in order to avoid excessively squeezing the packing ring between the restriction flange head, the utility model discloses can also be further connect the inner wall tip of set-square 5 one side on the pipe connection body, specifically within spacing outer lane 514, set up location outer lane 512. Correspondingly, a positioning inner ring 522 may be further provided on the pipe connecting body of the flange head connected thereto, specifically, at the end of the inner wall on the side where the triangular plate 5 is connected, at a position within the limit inner ring 524, corresponding to the positioning outer ring. The positioning outer ring 512 is recessed inwards, and the positioning inner ring 522 protrudes outwards, so that the positioning inner ring 522 can abut against the positioning outer ring 512 of the other flange head, the flange head is guided by the abutting action between the two positioning rings, and the radial displacement between the flange heads is limited.

Specifically, in a preferred implementation manner, in the above-mentioned flange head, the positioning outer ring 512 may be disposed at an end of the first flange joint far from the pipe connection end 513 and inside the first seal groove 511; the positioning inner ring 522 can be arranged at the end part of the second flange joint far away from the pipeline connecting end 523 and is positioned inside the second sealing groove 521; the positioning inner ring 522 is installed inside the positioning outer ring 512, and the end surfaces of the positioning inner ring and the positioning outer ring are mutually abutted, so that the distance between the first sealing groove 511 and the second sealing groove 521 is limited, and the gaskets arranged in the two sealing grooves are protected from being broken or damaged due to excessive extrusion deformation.

Further, for guaranteeing that the installation is smooth, make things convenient for the operator to dock two position circle structures in narrow and small operational environment accurately, the inner wall surface of location outer lane 512 can be provided with the inside sunken radian that figure 4 shows, the tip surface of the location inner lane 522 that corresponds can be provided with the radian that figure 4 shows, two radians match each other, the tip of location inner lane 522 can be guided by the radian of the inner wall surface of location outer lane 512, accurate dock to with location outer lane 512 concentric. At this time, since the depth of insertion of the positioning inner ring 522 into the first flange joint exceeds the mounting position of the gasket with respect to the first flange joint, the inner wall of the positioning inner ring 522 can be restricted between the gasket 5 and the medium flowing space formed inside the flange joint by the accommodation space of the positioning outer ring 512. That is to say, the utility model provides a location inner circle 522 except can through with the location between the outer lane butt limit flange head between the depth of insertion protection two flange head between the packing ring not by the transitional extrusion, the utility model provides a location inner circle 522 can also further block that the interior medium of pipeline is direct to avoid the packing ring to be influenced by material or impurity in the medium with the packing ring contact and age. The outer peripheral face laminating of location inner circle 522 can restrict the axial displacement between the flange head on the inner peripheral surface of location outer lane, and radial movement between the connecting piece is restricted by fasteners such as several even setting bolts between the flange joint portion on the set-square again, consequently, the utility model provides a rubber circle can be fixed by even butt, is sealed by the even restriction of seal groove. The utility model discloses assembly error between the well connecting piece can be limited to contract to 20 ~ 40 silks, can effectively protect the rubber circle, ensures sealed effect.

In other implementations, the guiding structures of the positioning inner ring 522 and the positioning outer ring 512 may be provided as a tapered inclined surface in addition to the arc scheme. It extends to first flange joint inside with the horn mouth shape, can provide the guide effect to the second flange joint. The length of the guide structure can be set to be thicker than the thickness of the rubber pad.

Therefore, the utility model discloses a flange structure realizes the fixed connection between the pipe fitting and restricts the relative rotation between the connection structure, the utility model discloses can be through the notch degree of depth that sets up the spacing outer lane of spacing inner circle, make and work as when the top butt of spacing inner circle 524 is at the inside bottom surface of spacing outer lane 514, the compression distance of packing ring 9 is in the non-destructive extrusion within range, guarantees that the load that the packing ring receives does not surpass elastic deformation's the scope that can bear all the time, and the protection packing ring can not damage deformation or extrusion and breaks.

In order to facilitate the assembly of the rotating flange head, the inner circumferential surface of the positioning outer ring 512 may be configured to be a circular truncated cone, and the outer circumferential surface of the positioning inner ring 522 may be correspondingly configured to be a circular truncated cone.

In other embodiments, the flange head, and the connecting portion thereof, should not be limited to the triangular plate shown in fig. 5. The first flange connection 53 arranged on the first flange head and the second flange connection 54 arranged on the second flange head may also be arranged correspondingly in the form of a disc, an ellipse, a rectangle or any polygon. Both of which can be used to achieve a fixed connection between the flange heads. In view of easy alignment and assembly, the connection portion is preferably configured to have a symmetrical or axisymmetrical structure such as a regular polygon, a regular circle, etc. so as to facilitate the corresponding arrangement of the first mounting hole 541 at the protruding portion of the first flange connection portion 54, the corresponding arrangement of the second mounting hole 531 at the protruding portion of the second flange connection portion 53, and the fastening members such as inserting bolts, etc. are aligned between the mounting holes for fixation.

Those of ordinary skill in the art will understand that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A flange joint, comprising:

the telescopic connecting piece (3) is hollow inside;

the flange heads (1) are respectively arranged at the end parts of the two sides of the telescopic connecting piece (3);

it is characterized by also comprising:

and the deformation recovery device (8) is arranged on the periphery of the telescopic connecting piece (3), and the end parts of the two ends of the deformation recovery device are respectively connected with the flange heads at the two ends of the telescopic connecting piece (3).

2. The flange joint according to claim 1, characterized in that the deformation recovery means (8) is a spring means having both ends fixedly connected to the flange heads (1) at both ends of the telescopic connection member (3), respectively, and having elasticity for driving the telescopic connection member (3) to recover from deformation.

3. The flange joint according to claim 1, characterized in that the telescopic connector (3) is a metal bellows, the wall of which is single-or double-layered.

4. The flange loose joint according to claim 1, characterized in that a sheath (6) is further sleeved between the telescopic connecting member (3) and the deformation recovery device (8), and two ends of the sheath (6) are respectively fixedly connected with the flange heads (1) at two ends of the telescopic connecting member (3).

5. The flange loose joint according to claim 4, characterized in that the sheath (6) is a metal woven sleeve, a protective layer (7) is further arranged between the metal woven sleeve and the telescopic connecting piece (3) inside the metal woven sleeve, and the protective layer (7) prevents the metal woven sleeve from directly contacting the telescopic connecting piece (3).

6. The flange loose joint according to claim 4, characterized in that a connecting transition joint (2) is welded between the telescopic connector (3) and the flange head (1), the inner ring of the connecting transition joint (2) is welded and sealed with the telescopic connector (3), and the outer ring (4) of the connecting transition joint is welded and fixed with the sheath (6) and a deformation recovery device (8) sleeved outside the sheath (6).

7. The flange joint according to claim 1, characterized in that the flange head (1) comprises a pipe connection body and a triangular plate (5); the pipeline connecting body is characterized in that the triangular plate (5) is arranged at the outer side end of the pipeline connecting body, the triangular plate (5) and the pipeline connecting body are integrally formed, or the triangular plate (5) is rotationally abutted and fixed with the pipeline connecting body through a flange connecting boss (45) arranged on the periphery of the pipeline connecting body.

8. The flange loose joint of claim 7, characterized in that the end surface of the pipe connecting body on the side of connecting the set square (5) is provided with a limiting outer ring (514) or a limiting inner ring (524) corresponding to the other flange head (1), the limiting outer ring (514) is recessed inwards, the limiting inner ring (524) is protruded outwards, and the limiting inner ring (524) abuts in the limiting outer ring (514) of the other flange head.

9. The flange loose joint of claim 8, characterized in that a first sealing groove (511) is arranged on the limit outer ring (514); a second sealing groove (521) is formed in the limiting inner ring (524); a gasket (9) is abutted between the limiting outer ring (514) and the limiting inner ring (524), and a first bulge (91) corresponding to the first sealing groove (511) and a second bulge (92) corresponding to the second sealing groove (521) are respectively arranged on the end faces of two sides of the gasket (9); the cross section of the first sealing groove (511) is different from that of the second sealing groove (521), and the cross sections of the first protrusion (91) and the second protrusion (92) are rectangular or arc-shaped which are matched with the cross sections of the first sealing groove (511) and the second sealing groove (521) respectively.

10. The flange loose joint of claim 8, characterized in that the end of the inner wall of the pipe connecting body on the side of connecting the set square (5) is further provided with a positioning outer ring (512) inside a limiting outer ring (514), or the end of the inner wall of the pipe connecting body on the side of connecting the set square (5) is further provided with a positioning inner ring (522) corresponding to another flange head (1) inside a limiting inner ring (524), the positioning outer ring (512) is recessed inwards, the positioning inner ring (522) is protruded outwards, and the positioning inner ring (522) abuts against the positioning outer ring (512) of the other flange head.

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