CN220286758U

CN220286758U - Pipeline expansion joint

Info

Publication number: CN220286758U
Application number: CN202322016620.1U
Authority: CN
Inventors: 常征; 蒋霁鑫; 刘红虎
Original assignee: Xinjiang Zhaorong Petrochemical Equipment Manufacturing Co ltd
Current assignee: Xinjiang Zhaorong Petrochemical Equipment Manufacturing Co ltd
Priority date: 2023-07-30
Filing date: 2023-07-30
Publication date: 2024-01-02
Anticipated expiration: 2033-07-30

Abstract

The technical field of pipeline connecting equipment, in particular to a pipeline expansion joint, which comprises a connecting pipe, wherein one end of the connecting pipe is sleeved with a first flange, the other end of the connecting pipe is sleeved with a first forging pipe, the first forging pipe comprises an A pipe and a C pipe which are fixedly communicated, the diameter of the A pipe is larger than that of the C pipe, the joint of the A pipe and the C pipe is obliquely arranged, the connecting pipe is sleeved in the A pipe, a gap for sliding the connecting pipe is arranged between the connecting pipe and the C pipe, a tetrafluoropacking is wound on the connecting pipe positioned in the A pipe, and a second flange is arranged on the C pipe; the outside cover of takeover is equipped with the bellows, the one end and the first flange of bellows are in succession, the other end and the A pipe fixed connection of bellows, this scheme effectually has solved the problem that pipeline expansion joint leakproofness is not good.

Description

Pipeline expansion joint

Technical Field

This scheme belongs to pipeline connecting device technical field, concretely relates to pipeline expansion joint.

Background

Flange joints are increasingly used in many machines and equipment, and at present, flange joint systems are operated under high temperature and high pressure conditions, and the bolt materials of the flange joint systems can generate irreversible plastic deformation until being destroyed due to long-term operation under high temperature and high pressure conditions. Therefore, the expansion joint can be additionally arranged at the flange connection part, the expansion joint has a certain expansion amount, and has a certain compensation protection effect when the pipeline expands when encountering heat or contracts when encountering cold, thereby being convenient for the installation and maintenance of the pump valve during overhauling.

The utility model with the application number of 202010150990.2 discloses an expansion joint which comprises a first flange, a second flange, a corrugated pipe, a first exhaust hole, a telescopic structure, an inner telescopic ring, an outer telescopic ring, a spring and a second exhaust hole. The beneficial effects of the utility model are as follows: when the whole pipeline is subjected to cold or thermal deformation, the pipeline can be lengthened or shortened, the inner telescopic ring and the outer telescopic ring can move in opposite directions or move reversely, so that the pipeline is unloaded or compensated, damage caused by the fact that the pipeline is subjected to cold or thermal deformation is avoided, the spring plays a buffering role, damage caused by the expansion joint is avoided, namely the service life of the expansion joint can be prolonged better under the action of the spring, the second exhaust hole can adjust the atmospheric pressure between the inner telescopic ring and the outer telescopic ring, the compensation effect of the pipeline when the pipeline is subjected to cold or thermal deformation is better, and the corrugated pipe can effectively prevent sundries from entering the space between the inner telescopic ring and the outer telescopic ring to influence the deformation compensation of the expansion joint on the pipeline.

The scheme can avoid damage caused by cold or thermal deformation of the pipeline to a certain extent, but when the expansion joint is applied to the silicon powder pipeline, the average granularity is almost nano-scale due to the very small granularity of the silicon powder, and the requirements on the expansion performance and the tightness of the pipeline are higher.

Disclosure of Invention

The purpose of this scheme is to provide a pipeline expansion joint to solve the problem that pipeline expansion joint leakproofness is not good.

In order to achieve the above purpose, the present scheme provides a pipe expansion joint, including a connecting pipe, one end of the connecting pipe is sleeved with a first flange, the other end of the connecting pipe is sleeved with a first forging pipe, the first forging pipe comprises an A pipe and a C pipe which are fixedly communicated, the diameter of the A pipe is larger than that of the C pipe, the joint of the A pipe and the C pipe is obliquely arranged, the connecting pipe is sleeved in the A pipe, a gap for sliding the connecting pipe is arranged between the connecting pipe and the C pipe, a tetrafluoro packing is wound on the connecting pipe positioned in the A pipe, and a second flange is arranged on the C pipe; the outside cover of takeover is equipped with the bellows, the one end and the first flange of bellows are connected, the other end and the A pipe fixed connection of bellows.

The principle of the scheme is as follows: when the pipeline is subjected to cold or heated deformation, the pipeline can be lengthened or shortened, the pipeline can cause tension to the two ends of the expansion joint when being lengthened, at the moment, the first flange and the second flange respectively move to the two ends to drive the first forged pipe and the connecting pipe to perform relative movement, and meanwhile, the corrugated pipe is lengthened; when the pipeline is contracted, pressure is caused to the pipeline expansion joint, and at the moment, the first flange and the second flange are close to each other to drive the first forged pipe and the connecting pipe to perform relative movement, and meanwhile, the compression of the corrugated pipe is shortened.

The technical effect of this scheme lies in: the relative displacement of the first forged pipe and the connecting pipe is utilized to buffer the pressure born by the pipeline, so that the damage caused by the compression deformation of the pipeline is avoided; the tetrafluoro packing has good chemical stability and self-lubricating performance, better sealing performance on powdery substances, unchanged strength under high temperature and humid environment, durability and easy filling and dismantling; the bellows is arranged to enable the first forged tube and the connecting tube to reset after relative movement.

Further, the inclination angle of the joint of the pipe A and the pipe C is 120-150 degrees. The small inclination angle of the accommodating cavity can cause silicon powder to accumulate at the corner of the first forging pipe; the angle of the accommodating cavity is too large, the forged tube is required to be set longer, the installation is inconvenient, and the angle of 120-150 degrees is a proper angle.

Further, the inner diameter of the connecting pipe is the same as that of the C pipe. Therefore, the pipeline sizes at the two ends of the pipeline expansion joint can be ensured to be consistent, the pipeline expansion joint can be better matched with the pipeline, and the fluidity of the silicon powder in the pipeline is better.

Further, one end of the connecting pipe close to the first flange is further sleeved with a second forging pipe, one end of the second forging pipe is fixedly connected with the first flange, and the other end of the second forging pipe is fixedly connected with the corrugated pipe. The second forging pipe is arranged, so that the corrugated pipe can be prevented from being directly connected with the flange, and the corrugated pipe is convenient to install.

Further, the number of the tetrafluoro packing is four, and two connecting pipes are respectively arranged at the connecting position of the connecting pipe and the first forging pipe and the connecting position of the connecting pipe and the second forging pipe. Two tetrafluoro packing are arranged at the joint of the connecting pipe, the first forging pipe and the second forging pipe, so that the tightness of the pipeline expansion joint can be further ensured.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present utility model.

Fig. 2 is a left side view of an embodiment of the present utility model.

Detailed Description

The following is a further detailed description of the embodiments:

reference numerals in the drawings of the specification include: 1. a first flange; 2. connecting pipe; 3. a second forged tube; 4. a second flange; 5. a bellows; 6. a tetrafluoro packing; 7. a flange gasket; 8. a pipe A; 9. and C pipe.

The embodiment is basically as shown in the accompanying figures 1-2:

including taking over 2, take over 2's one end welding has first flange 1, take over 2 outside is close to first flange 1 one end cover and is equipped with the second and forges tub 3, concrete second forges tub 3 internal diameter and is greater than take over 2 external diameters, the one end welding of second forges tub 3 has bellows 5 on first flange 1, the other end welding has first forges tub 5, bellows 5 other end welding has first forges tub, first forges tub including fixed intercommunication A pipe 8 and C pipe 9, A pipe 8 internal diameter is greater than C pipe 9 internal diameter, A pipe 8 is 135 slope with C pipe 9 junction, wherein, A pipe 8 internal diameter is unanimous with second forges tub 3 internal diameter, and the cover is established and is kept away from first flange 1 one end at take over 2, C pipe 9 internal diameter is unanimous with take over 2 internal diameters, first forges tub 2 one end welding has second flange 4, wherein, first flange 1 and second flange 4 are provided with flange gasket 7 with pipe connection one end respectively, in order to ensure that the pipe expansion joint is inseparabler with the pipe connection.

Wherein, in order to maximize the utilization ratio of the length of the corrugated pipe 5, the relative movement of the connecting pipe 2 can still occur in the first forged pipe when the corrugated pipe 5 is contracted to the maximum extent by adjusting the length of the corrugated pipe 5 and the length of the outward expansion part of the first forged pipe; when the bellows 5 is stretched to the maximum extent, the connecting pipe 2 and the first forging pipe are still in a sleeved state, so that the connecting pipe 2 and the first forging pipe are prevented from being separated, and damage to the expansion joint of the pipeline and leakage of silicon powder are avoided.

In order to ensure the tightness of the connection part of the first forging pipe and the connecting pipe 2 and the connection part of the second forging pipe 3 and the connecting pipe 2, silicon powder is prevented from leaking from the connection part, four tetrafluoro packing 6 are sleeved on the connecting pipe 2, wherein two connecting pipes 2 and the first forging pipe are installed at the connection part, two connecting pipes 2 and the second forging pipe 3 are arranged at the connection part, and the tetrafluoro packing 6 is contacted with the first forging pipe or the second forging pipe 3.

When the pipeline expansion joint is connected with the silicon powder pipeline through the flange, when the temperature or the pressure changes to enable the pipeline to stretch out and draw back, corresponding pressure is caused to the flanges at the two ends of the pipeline expansion joint, and then the connecting pipe 2 and the first forging pipe are enabled to relatively displace, meanwhile, the corrugated pipe 5 stretches out and draws back to deform, so that the pressure applied to the pipeline can be buffered, and the pipeline is effectively prevented from being damaged by compression.

The foregoing is merely exemplary embodiments of the present utility model, and specific structures and features that are well known in the art are not described in detail herein. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present utility model, and these should also be considered as the scope of the present utility model, which does not affect the effect of the implementation of the present utility model and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.

Claims

1. A pipe expansion joint, characterized in that: the novel plastic pipe comprises a connecting pipe (2), wherein a first flange (1) is sleeved at one end of the connecting pipe (2), a first forging pipe is sleeved at the other end of the connecting pipe (2), the first forging pipe comprises an A pipe (8) and a C pipe (9) which are fixedly communicated, the diameter of the A pipe (8) is larger than that of the C pipe (9), the joint of the A pipe (8) and the C pipe (9) is obliquely arranged, the connecting pipe (2) is sleeved in the A pipe (8), a gap for sliding the connecting pipe (2) is arranged between the connecting pipe (2) and the C pipe (9), a tetrafluoro packing (6) is wound on the connecting pipe (2) positioned in the A pipe (8), and a second flange (4) is arranged on the C pipe (9); the corrugated pipe (5) is sleeved outside the connecting pipe (2), one end of the corrugated pipe (5) is connected with the first flange (1), and the other end of the corrugated pipe (5) is fixedly connected with the pipe A (8).

2. A pipe expansion joint according to claim 1, wherein: the inclination angle of the joint of the pipe A (8) and the pipe C (9) is 120-150 degrees.

3. A pipe expansion joint according to claim 1, wherein: the inner diameter of the connecting pipe (2) is the same as that of the C pipe (9).

4. A pipe expansion joint according to claim 1, wherein: one end of the connecting pipe (2) close to the first flange (1) is further sleeved with a second forging pipe (3), one end of the second forging pipe (3) is fixedly connected with the first flange (1), and the other end of the second forging pipe is fixedly connected with the corrugated pipe (5).

5. A pipe expansion joint according to claim 1, wherein: the number of the tetrafluoro packing (6) is four, and two connecting pipes (2) and the first forging pipe and two connecting pipes (2) and the second forging pipe (3) are respectively arranged at the connecting positions.