Double-flow-guide unconstrained expansion joint

Abstract

The utility model relates to a double flow guide unconstrained expansion joint, which comprises a left connecting pipe, corrugated pipes, flow guide pipes and a right connecting pipe, the corrugated pipes comprise a first corrugated pipe and a second corrugated pipe, the flow guide pipes comprise a first flow guide pipe and a second flow guide pipe, the first flow guide pipe is arranged in the first corrugated pipe, and the second flow guide pipe is arranged in the second corrugated pipe; the left end of the first flow guide pipe is welded with the left connecting pipe, and the right end extends into the middle connecting pipe; the right end of the second flow guide pipe is welded with the right connecting pipe, and the left end extends into the middle connecting pipe; the first corrugated pipe and the second corrugated pipe are wrapped in a metal shell, the left end of the shell is welded to the left connecting pipe through a left annular plate, the right end of the shell is welded to a right annular plate, and the outer surface of the right connecting pipe is sleeved with the right annular plate. When the expansion joint is installed and used, the flowing direction of media does not need to be considered, the expansion joint can adapt to various media such as liquid and solid particles, the compensation length of the expansion joint is large, and the service life is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline expansion joints, in particular to a double - flow - guiding unconstrained expansion joint. Background Art

[0002] The structure of the existing corrugated pipe expansion joint generally includes a corrugated pipe, a flow - guiding pipe and left and right connecting pipes. The two ends of the corrugated pipe are respectively welded and fixed to the left connecting pipe and the right connecting pipe. The inner wall of the left connecting pipe is welded and fixed to the left end of the flow - guiding pipe, and the right end of the flow - guiding pipe extends into the inner cavity of the right connecting pipe.

[0003] At present, due to a large gap left between the right end of the flow - guiding pipe and the inner wall of the right connecting pipe in the existing corrugated pipe expansion joint, such expansion joints can only be installed and applied to pipelines with a single - flow - direction medium. Before installing the expansion joint, it is necessary to mark the medium flow direction and check the installation direction during pipeline construction to avoid the accident that the expansion joint is damaged soon after the pipeline is opened due to the wrong installation direction of the expansion joint.

[0004] In the existing heating system, sometimes it is necessary to switch the flow direction of the water flow in the pipeline. After the flow direction of the water is switched, the above - mentioned traditional corrugated pipe expansion joint usually causes the service life of the expansion joint to be shortened, or the expansion joint needs to be frequently maintained, resulting in an increase in the use cost.

[0005] For pipelines transporting solid particles such as pulverized coal, hard particles such as pulverized coal will enter the interior of the traditional expansion joint during use, thereby causing wear to the moving parts of the expansion joint, shortening the service life of the expansion joint, and increasing the use cost. Content of the Utility Model

[0006] The purpose of the utility model is a double - flow - guiding unconstrained expansion joint, which does not need to consider the flow direction of the medium during installation and use, has a larger compensation length of the expansion joint, and greatly extends the service life.

[0007] The purpose of the utility model is realized by adopting the following technical solutions:

[0008] A double - flow - guiding unconstrained expansion joint includes a left connecting pipe, a corrugated pipe, a flow - guiding pipe and a right connecting pipe. The corrugated pipe includes a first corrugated pipe and a second corrugated pipe. The flow - guiding pipe includes a first flow - guiding pipe and a second flow - guiding pipe. The first corrugated pipe is connected to the second corrugated pipe through an intermediate connecting pipe. The left end of the first corrugated pipe is connected to the left connecting pipe, and the right end of the second corrugated pipe is connected to the right connecting pipe;

[0009] The inner cavity of the first corrugated pipe is provided with a first flow - guiding pipe, and the inner cavity of the second corrugated pipe is provided with a second flow - guiding pipe; the left end of the first flow - guiding pipe is welded and fixed to the inner wall of the left connecting pipe, and its right end extends into the inner cavity of the intermediate connecting pipe;

[0010] The right end of the second diversion pipe is fixedly welded to the inner wall of the right connection pipe, and its left end extends into the inner cavity of the middle connection pipe;

[0011] The first corrugated pipe and the second corrugated pipe are wrapped in a metal shell. The left end of the shell is fixedly welded to the left connection pipe through a left ring plate, the right end of the shell is welded to a right ring plate, and the right ring plate is sleeved on the outer surface of the right connection pipe.

[0012] As a preferred technical solution of the present utility model, both ends of the first diversion pipe and the second diversion pipe are provided with a tapered structure that expands outward.

[0013] As a preferred technical solution of the present utility model, the right end of the first diversion pipe contacts or has a gap with the inner wall of the middle connection pipe.

[0014] As a preferred technical solution of the present utility model, the left end of the second diversion pipe contacts or has a gap with the inner wall of the middle connection pipe.

[0015] As a preferred technical solution of the present utility model, a stabilizing ring is provided on the outer surface of the middle connection pipe.

[0016] As a preferred technical solution of the present utility model, a guiding ring is provided on the outer surface of the right connection pipe between the right end of the second corrugated pipe and the right ring plate.

[0017] As a preferred technical solution of the present utility model, a first ear plate is provided on the outer surface of the right end of the shell, and a second ear plate is provided on the outer surface of the right connection pipe; the first ear plate and the second ear plate are connected by a pull rod and a nut assembly.

[0018] As a preferred technical solution of the present utility model, a pair of nuts are respectively provided at both ends of the pull rod, and the pull rod is connected and fixed to the ear plate through the nuts.

[0019] As a preferred technical solution of the present utility model, the right ring plate can slide left and right on the outer surface of the right connection pipe.

[0020] The beneficial effects of the present utility model: Compared with the prior art, in the present utility model, a first diversion pipe is provided in the first corrugated pipe, a second diversion pipe is provided in the second corrugated pipe, the right end of the first diversion pipe and the left end of the second diversion pipe contact or have a gap with the inner wall of the middle connection pipe; the first corrugated pipe and the second corrugated pipe are wrapped in a metal shell.

[0021] When the present utility model is installed and used, it is not necessary to consider the flow direction of the medium, and it can adapt to various media such as liquids and solid particles. The compensation length of the expansion joint is relatively large, and the service life is greatly extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the present utility model.

[0023] In the figure: 1. Left connecting pipe, 2. Left ring plate, 3. First bellows, 4. First diversion pipe, 5. Stabilizing ring, 6. Intermediate connecting pipe, 7. Outer shell, 8. Guide ring, 9. First ear plate, 10. Right ring plate, 11. Right connecting pipe, 12. Second ear plate, 13. Tie rod, 14. Nut, 15. Second bellows, 16. Second diversion pipe. Detailed implementation mode

[0024] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0025] As Figure 1 shown, a double-diversion unconstrained expansion joint includes a left connecting pipe 1, a bellows, a diversion pipe and a right connecting pipe 11. The bellows includes a first bellows 3 and a second bellows 15. The diversion pipe includes a first diversion pipe 4 and a second diversion pipe 16. The first bellows 3 is connected to the second bellows 15 through an intermediate connecting pipe 6. The left end of the first bellows 3 is connected to the left connecting pipe 1, and the right end of the second bellows 15 is connected to the right connecting pipe 11. A first diversion pipe 4 is arranged in the inner cavity of the first bellows 3, and a second diversion pipe 16 is arranged in the inner cavity of the second bellows 15. The left end of the first diversion pipe 4 is fixedly welded to the inner wall of the left connecting pipe 1, and its right end extends into the inner cavity of the intermediate connecting pipe 6. The right end of the second diversion pipe 16 is fixedly welded to the inner wall of the right connecting pipe 11, and its left end extends into the inner cavity of the intermediate connecting pipe 6. The first bellows 3 and the second bellows 15 are wrapped in a metal outer shell 7. The left end of the outer shell 7 is fixedly welded to the left connecting pipe 1 through a left ring plate 2, and the right end of the outer shell 7 is welded to the right ring plate 10, and the right ring plate 10 is sleeved on the outer surface of the right connecting pipe 11.

[0026] In this embodiment, both ends of the first diversion pipe 4 and the second diversion pipe 16 are provided with a tapered structure that expands outward. The right end of the first diversion pipe 4 contacts or has a gap with the inner wall of the intermediate connecting pipe 6. The left end of the second diversion pipe 16 contacts or has a gap with the inner wall of the intermediate connecting pipe 6. A stabilizing ring 5 is arranged on the outer surface of the intermediate connecting pipe 6. A guide ring 8 is arranged on the outer surface of the right connecting pipe 11 between the right end of the second bellows 15 and the right ring plate 10.

[0027] A first ear plate 9 is arranged on the outer surface of the right end of the outer shell 7, and a second ear plate 12 is arranged on the outer surface of the right connecting pipe 11. The first ear plate 9 and the second ear plate 12 are connected through a tie rod 13 and a nut 14 assembly. A pair of nuts 14 are respectively arranged at both ends of the tie rod  13, and the tie rod 13 is connected and fixed to the ear plate through the nuts 14. The right ring plate 10 can slide left and right on the outer surface of the right connecting pipe 11.

[0028] The above embodiments are only limited to illustrate the concept and technical features of the present utility model, and the purpose is to enable those skilled in the art to understand the technical solutions and implementation manners of the utility model, and shall not be used to limit the protection scope of the present utility model. Any equivalent substitution or equivalent change made according to the technical solutions of the present utility model shall be covered within the protection scope of the present utility model.

Claims

1. A double-flow unconstrained expansion joint, comprising a left connecting pipe, a corrugated pipe, a flow guiding pipe and a right connecting pipe. The corrugated pipe includes a first corrugated pipe and a second corrugated pipe. The flow guiding pipe includes a first flow guiding pipe and a second flow guiding pipe. It is characterized in that: The first bellows is connected to the second bellows through an intermediate pipe. The left end of the first bellows is connected to the left pipe, and the right end of the second bellows is connected to the right pipe; A first guide pipe is arranged in the inner cavity of the first bellows, and a second guide pipe is arranged in the inner cavity of the second bellows; the left end of the first guide pipe is fixedly welded to the inner wall of the left pipe, and its right end extends into the inner cavity of the intermediate pipe; The right end of the second guide pipe is fixedly welded to the inner wall of the right pipe, and its left end extends into the inner cavity of the intermediate pipe; The first bellows and the second bellows are wrapped in a metal shell. The left end of the shell is fixedly welded to the left pipe through a left ring plate, and the right end of the shell is welded to a right ring plate, and the right ring plate is sleeved on the outer surface of the right pipe.

2. The double-diversion unconstrained expansion joint according to claim 1, characterized in that: Both ends of the first guide pipe and the second guide pipe are provided with a tapered structure that expands outward.

3. The double-diversion unconstrained expansion joint according to claim 2, characterized in that: The right end of the first guide pipe contacts or has a gap with the inner wall of the intermediate pipe.

4. The double-flow unconstrained expansion joint according to claim 2, characterized in that: The left end of the second guide pipe contacts or has a gap with the inner wall of the intermediate pipe.

5. The double-flow unconstrained expansion joint according to any one of claims 1 to 4, characterized in that: A stabilizing ring is arranged on the outer surface of the intermediate pipe.

6. The double-diversion unconstrained expansion joint according to claim 5, characterized in that: A guide ring is arranged on the outer surface of the right pipe between the right end of the second bellows and the right ring plate.

7. The double-flow unconstrained expansion joint according to claim 1, characterized in that: A first ear plate is arranged on the outer surface of the right end of the shell, and a second ear plate is arranged on the outer surface of the right pipe; the first ear plate and the second ear plate are connected by a pull rod and a nut assembly.

8. The double-flow unconstrained expansion joint according to claim 7, characterized in that: A pair of nuts are respectively arranged at both ends of the pull rod and are connected and fixed to the ear plates through the nuts.

9. The double-flow unconstrained expansion joint according to claim 1, characterized in that: The right ring plate can slide left and right on the outer surface of the right pipe.

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