CN110645430A - a pipe connection device - Google Patents

Abstract

A pipeline connection device is used to connect between pipelines in a train and absorb the deformation amount of thermal expansion and contraction of pipelines. The present invention includes a pipe joint for connecting pipes, and a telescopic connection piece disposed between the pipe joints. The invention utilizes the telescopic connecting piece to form a pipeline between the pipes for the medium in the pipeline to circulate, and at the same time utilizes the deformation of the telescopic connecting piece to stretch correspondingly when the pipe contracts when cold to ensure the stability of the pipe connection, or when the pipe is preheated and expanded When the corresponding shrinkage to accommodate the deformation of the pipeline. Therefore, the present invention can absorb the stress acting on the pipe joint due to the thermal expansion and cold contraction deformation of the original pipeline, so that the pipeline and the pipe joint are not affected by the amount of deformation and expansion, so as to ensure that they are not deformed or loosened during the operation of the train, and ensure that the train pipeline is not affected. The inner medium will not leak and affect the train operation.

Description

a pipe connection device

technical field

The invention relates to the field of train parts, in particular to a pipeline connection device.

Background technique

The pipes on the train expand when heated and contract when cooled. Due to the large running distance of the train, the temperature difference of the operating environment of the train is obvious during the running process, so the pipeline will have a large deformation amount during the running process. For a 1m-long stainless steel tube, its thermal expansion and contraction during train operation is usually between 0.35 and 0.38 mm. The length of each steel pipe in the train is set to 6m, and the amount of thermal expansion and contraction between the steel pipes of the whole vehicle can reach 5-8 mm.

Since the pipes on the train have no stress-absorbing structure or space to accommodate deformation, the 5-8 mm expansion and contraction of the whole vehicle can only be released on the pipe joints connected between the pipes. During the operation of the train, the pipe joint needs to withstand the vibration of the train, and also needs to be stretched or compressed by the thermal expansion and contraction of the train pipeline, so it is easy to deform or loosen, resulting in the leakage of the medium in the pipeline and affecting the train operation.

Therefore, there is currently a need for a structure that can absorb the thermal expansion and contraction deformation of the train pipeline.

SUMMARY OF THE INVENTION

Aiming at the deficiencies of the prior art, the present invention provides a pipeline connection device. The invention realizes the release of the stress of the deformation of the train pipeline through the telescopic connector, protects the pipeline and the pipe joint itself from the stress caused by the environment, and protects the train. pipeline. The present invention specifically adopts the following technical solutions.

First, in order to achieve the above purpose, a pipeline connection device is proposed, which includes: a first pipe joint, which is arranged at one end of the pipeline connection device; a second pipe joint, which is arranged at the other end of the pipeline connection device; A telescopic connector, which is arranged in the middle of the pipeline connection device and located between the first pipe joint and the second pipe joint; one end of the telescopic joint is connected to the first pipe joint, and the other end is connected to the first pipe joint. Connect to the second pipe joint.

Optionally, any one of the above-mentioned pipeline connection devices further includes a sheath, which is surrounded by the outer wall of the pipeline of the telescopic connecting piece, and is fixed between the first pipe joint and the second pipe joint.

Optionally, in any of the above-mentioned pipeline connection devices, the telescopic connector is a metal corrugated pipe, and the pipe wall of the metal corrugated pipe is a single layer or a double layer.

Optionally, any of the above-mentioned pipeline connection devices further includes a connection transition joint, each of which is connected to the first pipe joint or the second pipe joint as a whole, and the connection transition joints are respectively connected as a whole. The section has an inner circumference and an outer circumference; wherein, the inner circumference of the connecting transition section is in sealing connection with the telescopic connecting piece, and the outer circumference of the connecting transition section is fixedly connected with the sheath.

Optionally, any of the above-mentioned pipeline connection devices, wherein the end of the telescopic connecting piece is welded on the inner circumference of the connecting transition section, and the telescopic connecting piece is connected to the first pipe joint and the second pipe joint. The inner wall of the pipe joint is communicated.

Optionally, in any of the above pipeline connection devices, the sheath is a metal braided sleeve, and the end of the metal braided sleeve is welded on the outer periphery of the connection transition joint.

Optionally, any of the above-mentioned pipeline connection devices, wherein the sheath and the connection transition section are surrounded on the outside of the telescopic connector, and the sheath and/or the telescopic connector are made of stainless steel, The surface of the metal braided sleeve has pores.

Optionally, any of the above-mentioned pipeline connection devices, wherein the metal braided sleeve and the telescopic connector are stretched or contracted synchronously to absorb the expansion and contraction of the pipeline connected to the first pipe joint and/or the second pipe joint. stress.

Optionally, any of the above-mentioned pipeline connection devices, wherein the first pipe joint is any one of an inner tooth pipe connection or an outer tooth pipe connection, and the second pipe joint is an inner tooth pipe connection or an outer tooth pipe connection. Any of the pipe connections.

Optionally, any of the above-mentioned pipeline connection devices, further comprising a rubber protective sleeve, the rubber protective sleeve is wrapped by the inner tooth pipe connection and/or the outer tooth pipe connection to the outer wall of the metal braided sleeve .

beneficial effect

The invention is connected between the pipes in the train, and absorbs the deformation of the pipes due to thermal expansion and contraction. The present invention includes a pipe joint for connecting pipes, and a telescopic connection piece disposed between the pipe joints. The invention utilizes the telescopic connecting piece to form a pipeline between the pipes for the medium in the pipeline to circulate, and at the same time utilizes the deformation of the telescopic connecting piece to stretch the pipe correspondingly when it is cold and shrink to ensure the stability of the pipe connection, or when the pipe is preheated and expanded When the corresponding shrinkage to accommodate the deformation of the pipeline. Therefore, the present invention can absorb the stress acting on the pipe joint due to the thermal expansion and cold contraction deformation of the original pipeline, so that the pipeline and the pipe joint are not affected by the amount of deformation and expansion, so as to ensure that they are not deformed or loosened during the operation of the train, and ensure that the train pipeline is not affected. The inner medium will not leak and affect the train operation.

In order to ensure the pressure bearing requirements in the pipeline, the present invention can further set the telescopic connecting piece as a double-layer stainless steel corrugated pipe. Since the stainless steel corrugated pipe itself has a relatively thin pipe wall, the present invention can also provide protection for the stainless steel corrugated pipe by a sheath composed of a metal braided sleeve. The metal braided sleeve itself has pores, and the metal wires between the pores can move synchronously with the tension or compression of the bellows to absorb the expansion and contraction stress, provide effective protection for the bellows inside it, and block the bump or impact of external foreign objects.

The pores of the metal braided sleeve can allow rainwater and various gases in the environment to pass through, preventing them from accumulating on the wall of the corrugated pipe and corroding the pipe body. In order to further temporarily provide a sealing effect on the medium in the pipe when the bellows in the pipe connection device is released and leaked, the present invention can also wrap a rubber protective sleeve on the outside of the metal braided sleeve, and the rubber protective sleeve can temporarily serve as a pipe for medium circulation. to avoid the train being forced to stop running due to pipeline failure.

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

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification, and together with the embodiments of the present invention, are used to explain the present invention, but not to limit the present invention. In the attached image:

Fig. 1 is the overall structure schematic diagram of the pipeline connection device of the present invention;

Fig. 2 is a partial schematic diagram of the connecting part of the pipeline connecting device and the train pipeline in Fig. 1;

FIG. 3 is a perspective view of an implementation manner of the pipeline connection device of the present invention.

In the figure, 1 represents the first pipe joint; 11 represents the pipeline; 2 represents the second pipe joint; 21 represents the inner wall of the external tooth pipe joint; 3 represents the expansion joint; ; 5 represents the sheath; 6 represents the bolt; 61 represents the thread; 62 represents the washer.

Detailed ways

In order to make the purpose and technical solutions of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and, unless defined as herein, are not to be taken in an idealized or overly formal sense. explain.

The meaning of "and/or" described in the present invention means that each of them exists alone or both of them exist simultaneously.

The meaning of "inside and outside" described in the present invention means that, with respect to the pipe connecting device itself, the direction pointing to the inside of the telescopic connector is inward, and the direction pointing to the outside of the sheath is outward; not to the device of the present invention Institution-specific qualifications.

The meaning of "connection" described in the present invention may be a direct connection between components or an indirect connection between components through other components.

FIG. 1 is a pipeline connection device according to the present invention, which is arranged in the pipeline of the train, and is connected to the end of the pipeline of the train by two or more pipe joints, and communicates with the pipeline 11 of the train. The pipeline connection device specifically includes:

Pipe joints, such as the first pipe joint 1 and the second pipe joint 2 shown in FIG. 1 , which are respectively connected to different pipes, can be correspondingly configured as inner or outer pipe joints or any combination thereof;

The telescopic connector 3, which is connected between the pipe joints, is located in the middle of the pipe connecting device. The telescopic connecting piece 3 and the pipeline form a pipeline for medium circulation, wherein one end of the telescopic connecting piece 3 is connected to the first pipe joint 1 and the other end is connected to the second pipe joint 2 . Since the telescopic connector itself has a certain expansion and deformation space, the connecting device between the pipelines can adapt to the deformation amount of thermal expansion and cold contraction of the pipeline, and shrink or expand accordingly. The expansion joint 3 is used to absorb the expansion of the pipeline, or to stretch the expansion joint 3 correspondingly when the pipeline shrinks when cold, so as to absorb the deformation stress of the pipeline itself and avoid the stress acting on other pipe joints without deformation space. , to avoid deformation or loosening of pipes or pipe joints affected by deformation stress, resulting in damage to the sealing performance of the entire pipeline and affecting train operation.

In some implementation manners, in the above-mentioned pipeline connection device, the telescopic connection member 3 can be selected as a corrugated pipe made of a metal material such as stainless steel. Specifically, it can be set as single-layer or double-layer or even multi-layer according to the pressure bearing requirements of the pipeline, so as to bear the pressure of 40kpa in the pipeline or corresponding to the pipeline pressure of at least 60kg.

In order to obtain an appropriate deformation space and ensure the pressure in the pipe, the stainless steel corrugated pipe generally has a relatively thin pipe wall structure. During the operation of the train, the collision of foreign objects or the accumulation of corrosive gases and liquids can easily damage them, thereby affecting the flexibility of the overall pipeline connection device expansion and contraction or affecting the sealing performance of the device. In order to avoid this influence, the present invention can also set a sheath 5 in the pipeline connection device in some implementation manners. The sheath 5 is surrounded by the outer wall of the pipeline of the telescopic connector 3 and is fixed between the first pipe joint 1 and the second pipe joint 2 to protect the telescopic joint 3 from bumping or impacting external foreign objects. .

In order to facilitate the fixing of the above-mentioned telescopic connector 3 and the sheath 5, the present invention may further provide a connecting transition section 4 near each of the pipe joints. For example, in the implementation manner shown in FIG. 1 , the two connecting transition joints 4 can be respectively connected to the first pipe joint 1 or the second pipe joint 2 as a whole, and each of the connecting transition joints 4 is respectively It has an inner circumference and an outer circumference; wherein, the inner circumference of the connecting transition section 4 is sealedly connected with the telescopic connecting piece 3 , and the outer circumference of the connecting transition section 4 is fixedly connected with the sheath 5 .

In some implementations, the end of the stainless steel bellows pipe wall can be welded on the inner circumference of the connecting transition section 4 by high-frequency oscillation welding, and communicate with the inner wall of the outer tooth pipe connection, so as to pass The inner nipple to which the outer nipple is connected is connected to the pipeline 11 of the train. In other ways, such as shown in the upper part of FIG. 1 , the stainless steel bellows tube wall and the connecting transition section 4 communicate with the inner wall of the inner tooth tube connection in a similar manner, so as to connect the outer tooth tube connected by the inner tooth tube connection. Pipe 11 to the train.

The connecting transition section 4 can be connected with the outer teeth in the pipeline connection device or with the inner teeth as a whole, and the ends of the corresponding telescopic connectors or the corresponding telescopic connectors are fixedly connected through its inner circumference and outer circumference. the end of the sheath. In the external thread pipe connection, the thread used for connecting with the inner thread pipe connection is arranged on the outer wall; the inner thread pipe connection has opposite threads and is provided on the inner wall of the inner thread pipe connection.

Taking one end of the pipeline connection device shown in FIG. 2 as an example, the end interface of the pipeline 11 is set as an inner tooth pipe connection, and the pipe joint of the pipeline connection device corresponding to this end is set as an outer tooth pipe connection as an example. In an implementation manner, referring to the partial cross-sectional view corresponding to the end of the pipe connection device shown by the dotted line in FIG. 1 , the inner circumference of the connecting transition section 4 is closer to the outer tooth pipe joint, and the outer circumference length of the connecting transition section 4 is longer than the inner circumference of the connecting transition section 4. The inner circumference and the outer circumference are welded with the outer teeth tube at a position close to the end of the inner wall 21 of the outer teeth tube connection in FIG. 2; there is a gap between the inner ring and the outer ring of the connecting transition the side wall for accommodating the telescopic connector 3;

The telescopic connecting piece 3 is arranged between the connecting transition joints 4 and is sealingly connected with the inner circumference of the connecting transition joint 4, so that the telescopic connecting piece 3, the inner circumference of the connecting transition joint 4 and the outer teeth are connected by pipes. The inner wall 21 and the pipeline 11 communicate with each other to form a pipeline for medium circulation; the telescopic connector 3 can correspondingly shrink to absorb the expansion of the pipeline during the process of thermal expansion or cold contraction of the pipeline 11, or corresponding stretching To ensure the stability of the pipeline connection;

Under the structure of the connecting transition section 4, the sheath 5 surrounds the telescopic connecting piece 3, and the end of the sheath can be fixedly connected with the outer circumference of the connecting transition section 4, and cooperate with the outer wall of the shield, Forms protection for the inner telescopic connector.

Referring to FIG. 2 , a washer 62 may be further abutted between the inner pipe joint and the outer pipe joint, so as to realize the sealing of the joint port to which they are connected. The periphery of the washer can be screwed and fixed by the thread 61 inside the bolt 6 and communicated to the pipeline.

In a more preferred implementation manner, in the above-mentioned pipeline connection device, the sheath 5 can be selected as a metal braided sheath made of 304 stainless steel or the like, and the end of the metal braided sheath is welded to the outer periphery of the connection transition joint 4 . Specifically, the outer wall of the end of the metal braided sleeve is welded to the inner wall of the outer periphery of the connecting transition joint 4, and the connecting transition joint 4 integrally closes the ports of the sheath 5 and the telescopic connector 3 to protect the ports from peeling off or detaching from external force. connect. Therefore, the metal braided sleeve and the outer circumference of the connecting transition section 4 surround the outer side of the telescopic connecting piece 3, providing protection for the telescopic connecting piece 3 such as the bellows, and preventing it from directly contacting external corrosive gases or liquid, to avoid the perforation of its pipe wall affecting the sealing of the medium inside the pipe.

In order to ensure the protection effect on the pipeline and the bellows structure, the metal braided sleeve is woven from stainless steel wire, and the braiding method makes the surface of the metal braided sleeve have pores, and the metal wires near the pores can move relatively. Provide a certain amount of expansion deformation. Therefore, during the operation of the train, the metal braided sleeve can be stretched or contracted by the pipe or the pipe joint synchronously with the telescopic connector 3, so as to absorb the expansion and contraction stress of the pipe connected to the outer tooth pipe joint, and avoid the The stress directly acts on the pipe joints such as the inner thread pipe connection or the outer thread pipe connection, pulling or compressing the gasket and the thread structure, so that the pipe joint is deformed and loosened.

In other implementation manners, in order to further temporarily provide a sealing effect on the medium in the pipe when the corrugated pipe in the pipe connection device is loose and leaked, the present invention can also wrap a rubber protective sleeve on the outside of the metal braided sleeve, and the rubber protective sleeve Temporarily act as a pipeline for medium circulation to avoid the train being forced to stop running due to pipeline failure. The rubber protective cover can further prevent the external hard objects from hitting the internal structure of the pipeline connection device, buffer the frequency vibration during the operation of the vehicle, and eliminate the fatigue of the internal mechanical structure.

Therefore, the invention can provide the deformation amount for the expansion and contraction of the pipeline through the expansion and contraction joint formed by the corrugated pipe, and solve the problem that the expansion space of the pipe joint in the pipeline is limited and is easily deformed and loosened by the expansion and contraction of the pipeline. In the pipeline connection device of the present invention, the length of the corrugated pipe can be set between 15 and 20 cm according to the required deformation amount of the pipeline length, so as to provide sufficient expansion and contraction margin, and ensure that the pipeline and the pipe joints in the pipeline will not The telescopic deformation can effectively avoid the leakage of pipeline medium and affect the train operation.

The above is only an embodiment of the present invention, and its description is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention.

Claims (10)

1. A pipe coupling, comprising:

a first pipe joint (1) provided at one end portion of the pipe connection device;

a second pipe joint (2) provided at the other end of the pipe connection device;

the telescopic connecting piece (3) is arranged in the middle of the pipeline connecting device and is positioned between the first pipe joint (1) and the second pipe joint (2); one end of the telescopic connecting piece (3) is connected to the first pipe joint (1), and the other end of the telescopic connecting piece is connected to the second pipe joint (2).

2. The pipe connection according to claim 1, characterized by further comprising a jacket (5) surrounding the outer wall of the line of the telescopic connection (3) and fixed between the first pipe joint (1) and the second pipe joint (2).

3. The pipe connection according to claim 2, characterized in that the telescopic connection (3) is a metal bellows, the wall of which is single-or double-layered.

4. The pipe coupling according to claim 2, further comprising coupling transition joints (4), each coupling transition joint (4) being integrally connected to the first pipe joint (1) or the second pipe joint (2), respectively, the coupling transition joint (4) having an inner periphery and an outer periphery; the inner periphery of the connecting transition joint (4) is connected with the telescopic connecting piece (3) in a sealing mode, and the outer periphery of the connecting transition joint (4) is fixedly connected with the sheath (5).

5. Pipe connection device according to claims 1-4, characterized in that the ends of the telescopic connector (3) are welded to the inner circumference of the connection transition piece (4), the telescopic connector (3) communicating with the inner walls of the first pipe joint (1) and the second pipe joint (2).

6. Pipe connection device according to claims 1-4, characterized in that the sheath (5) is a metal braided sleeve, the ends of which are welded to the outer circumference of the connection transition piece (4).

7. The pipe connection according to claim 6, characterized in that the jacket (5) and the connection transition joint (4) are enclosed on the outside of the telescopic connector (3), the jacket (5) and/or the telescopic connector (3) being of stainless steel, the surface of the metal braided jacket being porous.

8. The pipe connection according to claim 6, characterized in that the simultaneous stretching or shrinking of the metal braid and the telescopic connector (3) absorbs the telescopic stress of the pipe to which the first pipe joint (1) and/or the second pipe joint (2) is connected.

9. The pipe connection according to claim 8, wherein the first pipe joint (1) is any one of an internal pipe joint or an external pipe joint, and the second pipe joint (2) is any one of an internal pipe joint or an external pipe joint.

10. The pipe coupling according to claims 1-9, further comprising a rubber boot wrapped by the inner and/or outer adapters to an outer wall of the metal woven sleeve.

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