CN211693973U - Expansion loose joint - Google Patents

Abstract

An expansion loose joint comprises a telescopic connecting piece and a pipe connector which are mutually communicated, and further comprises a deformation recovery device arranged on the periphery of the telescopic connecting piece. The utility model discloses a pipe connector 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 absorbed the deflection and produces deformation, the synchronous deformation recovery unit that sets up through the telescopic connection spare periphery provides the stress that drives its deformation and resume for telescopic connection spare. The utility model discloses can absorb originally because of the pipeline deformation acts on the stress of union, guarantee that pipe-line system and inflation union 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

Expansion loose joint

Technical Field

The utility model relates to a rail vehicle spare part field especially relates to an inflation 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.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects existing in the prior art, the utility model aims to provide an expansion 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 present invention provides an expansion joint, which comprises: the telescopic connecting piece is hollow inside; pipe connectors respectively arranged at the two side ends of the telescopic connector; it still includes: and the deformation recovery device 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 pipe connectors at the two ends of the telescopic connecting piece.

Optionally, the expansion loose joint described in any one of the above, wherein the deformation recovery device is a spring device whose two ends are respectively fixedly connected to pipe connectors at two ends of the telescopic connecting member, and the spring device has elasticity for driving the telescopic connecting member to deform and recover.

Optionally, the expansion loose joint is any one of the expansion loose joint described above, 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 of the above expansion loose joints, a sheath is further disposed between the telescopic connecting member and the deformation recovery device, and two ends of the sheath are respectively and fixedly connected to the pipe connecting members at two ends of the telescopic connecting member.

Optionally, the expansion loose joint described in any 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 expansion loose joint described in any of the above, wherein a connection transition section is welded between the telescopic connecting member and the pipe connecting member, an inner circumference of the connection transition section is welded and sealed with the telescopic connecting member, and an outer circumference of the connection transition section is welded and fixed with the sheath and the deformation recovery device sleeved outside the sheath.

Optionally, the expansion loose joint comprises a pipe joint member, wherein the pipe joint member comprises an inner pipe joint, an outer pipe joint or a combination thereof.

Optionally, any one of the above expansion loose joints, wherein a first sealing groove is formed in the outer end of the inner pipe joint connected with other pipelines along the circumferential direction, a sealing ring is abutted in the first sealing groove, one side of the sealing ring is abutted to the inner pipe joint, the other side of the sealing ring is abutted to the outer pipe joint arranged at the end of other pipelines, a loose joint bolt is abutted to the outer ring of the inner pipe joint, and the loose joint bolt is screwed to the outer pipe joint arranged at the end of other pipelines to keep the inner pipe joint to be communicated with other pipelines in a sealing manner.

Optionally, any above-mentioned inflation loose joint, wherein, the outside end that outer pipe connector and other pipelines are connected is provided with the second seal groove along circumference, and the butt has the sealing washer in the second seal groove, one side butt of sealing washer outer pipe connector, the opposite side butt of sealing washer sets up the interior pipe connector at other pipelines tip, the outer lane threaded connection of outer pipe connector has loose joint bolt, and loose joint bolt is fixed with the interior pipe connector butt that sets up at other pipelines tip, keeps outer pipe connector sealed intercommunication connects to other pipelines.

Optionally, in any one of the expansion loose joints, a first protruding portion and a second protruding portion are respectively arranged on two sides of the sealing ring along the circumferential direction, the first protruding portion abuts against an inner wall of the first sealing groove, and the first protruding portion seals an end face of the inner thread pipe in the circumferential direction; the second bulge is abutted against the inner wall of the second sealing groove and seals the circumferential end face of the outer dental tube; the cross section shape of the first sealing groove is different from that of the second sealing groove, and the cross section of the first bulge and the cross section of the second bulge 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.

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

1. the utility model provides an inflation loose joint, it passes through the pipe connector and 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, synchronous through setting up the stress that provides its deformation of drive and resume at the deformation recovery device of telescopic connection spare periphery for telescopic connection spare. The utility model discloses can absorb originally because of the stress that pipeline deformation acted on the union, guarantee that pipe-line system and inflation union itself do not receive the flexible influence of deformation, guarantee that it appears not warping or pine takes off at train operation process. 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.

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 at two sides of the spring structure and the telescopic connecting piece are connected to the pipe connecting piece together, so that the deformation stress borne by the spring structure and the telescopic connecting piece are completely synchronous. The elasticity that spring structure itself has can be accurate drive spring when taking place deformation resume to initial rectilinear state to accurate pipe connector through its both ends drives the flexible connecting piece and resumes rectilinear 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 further protection pipeline, the utility model discloses still 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.

4. For guaranteeing the connection that the inflation loose joint can be reliable is on the pipeline, the utility model discloses the pipe connector that will expand the loose joint both ends specifically sets up to interior pipe connector and/or outer pipe connector. The outer rings of the inner pipe joint and the outer pipe joint are connected and sealed through loose joint bolts. Thus, the entire pipe joint structure can only integrally rotate along with the pipe without relative movement between the inner and outer pipe joints. Therefore, the expansion loose joint of the utility model can move or rotate along with the whole pipeline without loosing or losing the sealing performance because of the movement between the expansion loose joint and the pipeline.

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:

FIG. 1 is a schematic view of the overall structure of an expansion loose joint according to the present invention

FIG. 2 is a schematic view of the inner pipe joint in the expansion loose joint of the present invention in a sealed state;

fig. 3 is a schematic view of the inner pipe joint in the expansion loose joint of the present invention in a state.

In the drawings, 1 denotes a telescopic link; 101 denotes a connection transition section; 20 denotes an internal thread joint; 201 denotes a first seal groove; 30 denotes an outer pipe joint; 301 denotes a second seal groove; 302 represents external threads; 40 denotes a loose joint bolt; 401 denotes a bolt internal thread; 402 denotes a connecting portion; 50 denotes a seal ring; 501, a first projection; 502 denotes a second projection; 6 denotes a sheath; 16 denotes a protective layer; and 7, a strain recovery means.

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 utility model means that the direction from the external deformation recovery device to the internal medium of the expansion loose joint pipeline is inside, otherwise is outside, relative to the expansion loose joint; 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 an inflation loose joint, refer to fig. 1 and show, it includes:

the telescopic connecting piece 1 is hollow inside and can seal media or gas circulating in the pipelines at two ends;

pipe connectors respectively arranged at both side ends of the telescopic connector 1;

it still includes:

the deformation recovery device 7 is arranged on the periphery of the telescopic connecting piece 1, and the end parts of the two ends of the deformation recovery device are respectively connected with the pipe connecting pieces at the two ends of the telescopic connecting piece 1;

therefore, the pipe connector and the telescopic connector 1 are communicated with each other so as to facilitate the circulation of the medium or gas circulating in the pipelines at the two ends. And, simultaneously, make the utility model discloses an expansion loose joint can be through the pipe connector 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 stress that pipeline deformation acted on the union, guarantee that pipe-line system and inflation union itself do not receive the flexible influence of deformation, guarantee that it appears not warping or pine takes off at train operation process. 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 7 may be a spring, especially a spring device such as a tension spring. The elastic device can be specifically set to be fixedly connected with the pipe connectors at the two ends of the telescopic connecting piece 1 at two ends respectively. Since the elastic means are elastic and are connected together with the telescopic links by the pipe connectors, said elastic means can be synchronously stretched, rotated or deformed along with the telescopic links, whereas since the elastic means themselves have elasticity which enables the elastic means to return to their original linear state, the elastic means can drive the telescopic links 1 synchronously by the pipe connectors, restoring the deformation of the telescopic links by 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, the concrete optional realization of metal bellows that passes through of telescopic connection spare 1. 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 1 sets up sheath 6 with deformation recovery unit 7 between, and will the both ends of sheath 6 respectively with the pipe connector fixed connection at flexible connecting piece 1 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 inflation 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 respond to the pipeline trouble and by compelled bring to rest.

And in order to avoid the mutual friction between the metal woven sleeve and the expansion and movable joint 1 inside the metal woven sleeve in the process of expansion and movable joint deformation movement, the utility model discloses still can be further set up the protective layer 16 of materials such as asbestos between the two. The protective layer 16 can prevent the metal braided sleeve from directly contacting the telescopic connector 1, and further protect the corrugated pipe.

In some implementations, as shown with reference to FIG. 2, the coupling between the telescoping connector 1 and the pipe coupling may be provided by a coupling transition joint. The connecting transition joint 101 is welded between the telescopic connecting piece 1 and the pipe connecting piece, specifically, the inner circumference of the connecting transition joint 101 is sealed with the telescopic connecting piece 1 in a welding mode, and the outer circumference of the connecting transition joint 101 is fixedly connected with the sheath 6 and the deformation recovery device 7 sleeved outside the sheath 6 in a welding mode. The telescopic connecting piece 1 with the inner layer formed by the corrugated pipe, the sheath outside the telescopic connecting piece and the end part of the elastic device surrounded by the sheath can be connected and fixed through the connecting transition joint 101, so that the telescopic connecting piece 1, the sheath outside the telescopic connecting piece and the end part of the elastic device surrounded by the sheath are mutually connected to form an integral synchronous rotation, stretching, contraction or bending, and the elastic device synchronously restores to a linear state.

The pipe joint member provided at both ends of the expansion loose joint of the present invention can be configured as any one of or a combination of an inner pipe joint and an outer pipe joint in the manner shown in fig. 3.

The inner pipe joint 20 may be configured to be sealed by a loose joint bolt to an outer pipe joint provided at the end of another pipe. The outer end of the inner pipe connector 20 connected with other pipelines is provided with a first sealing groove 201 along the circumferential direction, the first sealing groove 201 is internally abutted with a sealing ring 50, one side of the sealing ring 50 is abutted with the inner pipe connector 20, and the other side of the sealing ring 50 is abutted with the outer pipe connector 30 arranged at the end of other pipelines. The outer race of the inner adapter 20 abuts the inwardly converging connecting portion 402 of the loose joint bolt 40. The loose joint bolt 40 is provided at the inner side thereof with a bolt female screw 401 which is screwed and fixed with an outer thread 302 provided on the outer side surface of the outer nipple 30 provided at the end of the other pipe to keep the inner nipple 20 sealingly communicated with the other pipe.

Similarly, the outer adapters 30 may be configured to be sealed by loose bolts to inner adapters disposed on the ends of other pipes. Wherein, outer screwed pipe joint 30 is provided with second seal groove 301 along circumference with the outside end that other pipelines are connected, and the butt has sealing washer 50 in the second seal groove 301, one side butt of sealing washer 50 outer screwed pipe joint 30, the opposite side butt of sealing washer 50 sets up the interior screwed pipe joint 20 at other pipeline tip, the outer lane threaded connection of outer screwed pipe joint 30 has loose joint bolt 40, and loose joint bolt 40 is fixed with the interior screwed pipe joint 20 butt that sets up at other pipeline tip, keeps outer screwed pipe joint 30 is sealed to be connected to other pipelines in the intercommunication.

In order to effectively ensure the seal between the pipe joint members, the seal ring 50 may be provided with a first protrusion 501 and a second protrusion 502, which are circumferentially disposed on both sides. The first protruding portion 501 abuts against the inner wall of the first seal groove 201, and the first protruding portion 501 seals the circumferential end face of the inner pipe joint 20; the second protrusion 502 abuts against the inner wall of the second seal groove 301, and the second protrusion 502 seals the circumferential end surface of the outer tube fitting 30.

To further ensure the sealing effect and facilitate the assembly between the pipe joint members, the cross-sectional shape of the first sealing groove 201 and the cross-sectional shape of the second sealing groove 301 may be different. Specifically, one of the cross section of the first projecting portion 501 and the cross section of the second projecting portion 502 may be provided in a rectangular shape, and the other may be provided in an arc shape. For the cross section of each protrusion, the cross section of the first seal groove 201 to be abutted with the first protrusion 501 and the cross section of the second seal groove 301 to be abutted with the second protrusion 502 may be respectively set to be rectangular or arc shapes with mutually matched sizes. 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 the butt joint installation of pipe connector spare, 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 make full use of pipe joint structure guarantee the inflation loose joint firm in connection and guarantee that whole pipeline is sealed.

For further avoiding relative rotation between the pipe connector piece, the utility model discloses still can be further set up the backstop in loose joint bolt 40's periphery, buckle the outer lane parcel at loose joint bolt 40's surface with the inner circle butt of backstop in the periphery of interior screwed pipe connector 20. Therefore, the stop connects the loose joint bolt 40 and the inner pipe joint 20 into a whole, and the loose joint bolt 40 can be effectively prevented from rotating and loosening relative to the inner pipe joint 20.

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. An expansion joint, comprising:

the telescopic connecting piece (1) is hollow inside;

pipe connectors which are respectively arranged at the two side ends of the telescopic connecting piece (1);

it is characterized by also comprising:

and the deformation recovery device (7) is arranged on the periphery of the telescopic connecting piece (1), and the end parts of the two ends of the deformation recovery device are respectively connected with the pipe connectors at the two ends of the telescopic connecting piece (1).

2. Expansion joint according to claim 1, characterized in that the deformation recovery means (7) are spring means fixedly connected at both ends to the pipe connectors at both ends of the telescopic link (1), respectively, and having elasticity for driving the telescopic link (1) to recover its deformation.

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

4. Expansion joint according to claim 1, characterized in that a sheath (6) is further arranged between the telescopic connector (1) and the deformation recovery device (7), and both ends of the sheath (6) are fixedly connected with the pipe connectors at both ends of the telescopic connector (1), respectively.

5. Expansion joint according to claim 4, characterized in that the sheath (6) is a metal woven sheath, a protective layer (16) is arranged between the metal woven sheath and the telescopic connector (1) inside the metal woven sheath, and the protective layer (16) prevents the metal woven sheath from directly contacting the telescopic connector (1).

6. The expansion joint according to claim 4, characterized in that a connecting transition joint (101) is welded between the telescopic connector (1) and the pipe connector, the inner circumference of the connecting transition joint (101) is welded and sealed with the telescopic connector (1), and the outer circumference of the connecting transition joint (101) is welded and fixed with the sheath (6) and the deformation recovery device (7) sleeved outside the sheath (6).

7. The expansion joint of claim 1, wherein the pipe joint member comprises either an inner pipe joint, an outer pipe joint, or a combination thereof.

8. The expansion loose joint according to claim 7, characterized in that a first sealing groove (201) is circumferentially arranged at the outer end of the inner pipe joint (20) connected with other pipelines, a sealing ring (50) is abutted in the first sealing groove (201), one side of the sealing ring (50) is abutted against the inner pipe joint (20), the other side of the sealing ring (50) is abutted against the outer pipe joint (30) arranged at the end of other pipelines, a loose joint bolt (40) is abutted against the outer ring of the inner pipe joint (20), and the loose joint bolt (40) is screwed with the outer pipe joint (30) arranged at the end of other pipelines to keep the inner pipe joint (20) hermetically communicated with other pipelines.

9. The expansion loose joint of claim 7, characterized in that a second sealing groove (301) is circumferentially arranged at the outer end of the outer pipe joint (30) connected with other pipelines, a sealing ring (50) is abutted in the second sealing groove (301), one side of the sealing ring (50) is abutted against the outer pipe joint (30), the other side of the sealing ring (50) is abutted against the inner pipe joint (20) arranged at the end of other pipelines, a loose joint bolt (40) is threadedly connected to the outer ring of the outer pipe joint (30), and the loose joint bolt (40) is abutted against and fixed with the inner pipe joint (20) arranged at the end of other pipelines to keep the outer pipe joint (30) hermetically communicated with other pipelines.

10. The expansion joint according to claim 8 or 9, wherein a first protrusion (501) and a second protrusion (502) are respectively provided on both sides of the seal ring (50) in the circumferential direction, the first protrusion (501) abuts against an inner wall of the first seal groove (201), and the first protrusion (501) seals an end face of the inner pipe joint (20) in the circumferential direction; the second bulge (502) is abutted against the inner wall of the second sealing groove (301), and the second bulge (502) seals the circumferential end face of the outer pipe joint (30); the cross section shape of the first sealing groove (201) is different from that of the second sealing groove (301), and the cross section of the first protrusion (501) and the cross section of the second protrusion (502) are respectively rectangular or arc-shaped matched with the cross section of the first sealing groove (201) and the cross section size of the second sealing groove (301).

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