Compound double-flow-guide expansion joint

Abstract

The utility model relates to a compound double flow guide 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, and the flow guide pipes comprise a first flow guide pipe and a second flow guide pipe; the first corrugated pipe is connected with the second corrugated pipe through the middle connecting pipe, a first flow guide pipe is arranged in the first corrugated pipe, and a second flow guide pipe is arranged in the second corrugated pipe; the left end of the first flow guide pipe is welded and fixed with the left connecting pipe, and the right end of the first flow guide pipe extends into an inner cavity of the middle connecting pipe; the right end of the second flow guide pipe is welded and fixed with the right connecting pipe, and the left end of the second flow guide pipe extends into the inner cavity of the middle connecting pipe; the right end of the first flow guide pipe and the left end of the second flow guide pipe make contact with the inner wall of the middle connecting pipe. When the expansion joint is installed and used, the flowing direction of media does not need to be considered, the compensation length of the expansion joint is large, and the service life is greatly prolonged. The device is particularly suitable for being installed on a heating system needing to frequently switch the water flow direction.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline expansion joints, and particularly to a compound double-guide flow expansion joint. Background Art

[0002] The structure of the existing corrugated pipe expansion joint generally includes a corrugated pipe, a guide 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 guide pipe, and the right end of the guide pipe extends into the inner cavity of the right connecting pipe.

[0003] Currently, due to a large gap left between the right end of the guide 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 of the medium. Before installing the expansion joint, it is necessary to mark the flow direction of the medium and check the installation direction during pipeline construction to avoid incorrect installation direction of the expansion joint, resulting in an accident of expansion joint damage soon after the pipeline is opened.

[0004] In the existing heating system, sometimes it is necessary to switch the flow direction of the water 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. Content of the Utility Model

[0005] The purpose of the utility model is to provide a compound double-guide flow 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.

[0006] The purpose of the utility model is achieved by adopting the following technical solutions:

[0007] A compound double-guide flow expansion joint includes a left connecting pipe, a corrugated pipe, a guide pipe, and a right connecting pipe. The corrugated pipe includes a first corrugated pipe and a second corrugated pipe, and the guide pipe includes a first guide pipe and a second guide pipe;

[0008] 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 guide pipe, and the inner cavity of the second corrugated pipe is provided with a second guide pipe;

[0010] The left end of the first guide pipe is welded and fixed to the inner wall of the left connecting pipe, and the right end of the first guide pipe extends into the inner cavity of the intermediate connecting pipe;

[0011] The right end of the second guide pipe is welded and fixed to the inner wall of the right connecting pipe, and the left end of the second guide pipe extends into the inner cavity of the intermediate connecting pipe.

[0012] As a preferred technical solution of the present utility model, both the first diversion pipe and the second diversion pipe are provided with a conical structure with both ends expanding outwards.

[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 intermediate 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 intermediate pipe.

[0015] As a preferred technical solution of the present utility model, multiple groups of oppositely arranged ear plates are evenly distributed on the outer surfaces of the left pipe and the intermediate pipe, and each group of ear plates is connected by a pull rod and a nut assembly.

[0016] As a preferred technical solution of the present utility model, multiple groups of oppositely arranged ear plates are evenly distributed on the outer surfaces of the right pipe and the intermediate pipe, and each group of ear plates is connected by a pull rod and a nut assembly.

[0017] 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.

[0018] The beneficial effects of the present utility model: Compared with the prior art, the first diversion pipe is arranged inside the first corrugated pipe of the present utility model, and the second diversion pipe is arranged inside the second corrugated pipe; the right end of the first diversion pipe contacts or has a gap with the inner wall of the intermediate pipe; the left end of the second diversion pipe contacts or has a gap with the inner wall of the intermediate pipe. This enables the present utility model to not need to consider the flow direction of the medium during installation and use, and the compensation length of the expansion joint is relatively large, greatly extending the service life. The present utility model is particularly suitable for being installed in a heating system that needs to frequently switch the water flow direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural view of the present utility model.

[0020] In the figure: 1, left pipe; 2, first corrugated pipe; 3, intermediate pipe; 4, first diversion pipe; 5, ear plate; 6, pull rod; 7, nut; 8, second corrugated pipe; 9, right pipe; 10, second diversion pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present utility model will be further described below in conjunction with the drawings and specific embodiments:

[0022] Such as Figure 1As shown in the figure, a compound double-flow expansion joint includes a left connection pipe 1, a corrugated pipe, a flow guide pipe, and a right connection pipe 9. The corrugated pipe includes a first corrugated pipe 2 and a second corrugated pipe 8. The flow guide pipe includes a first flow guide pipe 4 and a second flow guide pipe 10. The first corrugated pipe 2 is connected to the second corrugated pipe 8 through an intermediate connection pipe 3. The left end of the first corrugated pipe 2 is connected to the left connection pipe 1, and the right end of the second corrugated pipe 8 is connected to the right connection pipe 9. The inner cavity of the first corrugated pipe 2 is provided with a first flow guide pipe 4, and the inner cavity of the second corrugated pipe 8 is provided with a second flow guide pipe 10. The left end of the first flow guide pipe 4 is fixedly welded to the inner wall of the left connection pipe 1, and the right end of the first flow guide pipe 4 extends into the inner cavity of the intermediate connection pipe 3. The right end of the second flow guide pipe 10 is fixedly welded to the inner wall of the right connection pipe 9, and the left end of the second flow guide pipe 10 extends into the inner cavity of the intermediate connection pipe 3.

[0023] In this embodiment, both the first flow guide pipe 4 and the second flow guide pipe 10 are provided with a conical structure that expands outward at both ends. The right end of the first flow guide pipe 4 contacts or has a gap with the inner wall of the intermediate connection pipe 3; the left end of the second flow guide pipe 10 contacts or has a gap with the inner wall of the intermediate connection pipe 3.

[0024] In this embodiment, multiple groups of oppositely arranged ear plates 5 are evenly distributed on the outer surfaces of the left connection pipe 1 and the intermediate connection pipe 3, and each group of ear plates 5 is connected by a pull rod 6 and a nut 7 assembly; multiple groups of oppositely arranged ear plates 5 are evenly distributed on the outer surfaces of the right connection pipe 9 and the intermediate connection pipe 3, and each group of ear plates 5 is connected by a pull rod 6 and a nut 7 assembly; a pair of nuts 7 are respectively provided at both ends of the pull rod 6, and the pull rod 6 is connected and fixed to the ear plate 5 through the nuts 7.

[0025] The above embodiments are only limited to explaining the concept and technical features of the present invention, and their purpose is to enable those skilled in the art to understand the technical solutions and implementation manners of the present invention, and cannot be used to limit the protection scope of the present invention accordingly. Any equivalent replacement or equivalent change made according to the technical solutions of the present invention should be covered within the protection scope of the present invention.

Claims

1. A compound double-flow expansion joint, comprising a left connecting pipe, a corrugated pipe, a flow guide pipe and a right connecting pipe, characterized in that: The corrugated pipe includes a first corrugated pipe and a second corrugated pipe, and the diversion pipe includes a first diversion pipe and a second diversion pipe; The first corrugated pipe is connected to the second corrugated pipe through an intermediate pipe. The left end of the first corrugated pipe is connected to the left pipe, and the right end of the second corrugated pipe is connected to the right pipe; The inner cavity of the first corrugated pipe is provided with a first diversion pipe, and the inner cavity of the second corrugated pipe is provided with a second diversion pipe; The left end of the first diversion pipe is fixedly welded to the inner wall of the left pipe, and the right end of the first diversion pipe extends into the inner cavity of the intermediate pipe; The right end of the second diversion pipe is fixedly welded to the inner wall of the right pipe, and the left end of the second diversion pipe extends into the inner cavity of the intermediate pipe.

2. The double-layer double-flow expansion joint according to claim 1, wherein: Both the first diversion pipe and the second diversion pipe are configured as tapered structures that expand outward at both ends.

3. The double-layer double-flow expansion joint according to claim 2, wherein: The right end of the first diversion pipe contacts or has a gap with the inner wall of the intermediate pipe.

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

5. The double-layer double-flow expansion joint according to claim 1, characterized in that: Multiple groups of oppositely arranged ear plates are evenly distributed on the outer surfaces of the left pipe and the intermediate pipe, and each group of ear plates is connected by a pull rod and a nut assembly.

6. The double-layer double-flow expansion joint according to claim 1, characterized in that: Multiple groups of oppositely arranged ear plates are evenly distributed on the outer surfaces of the right pipe and the intermediate pipe, and each group of ear plates is connected by a pull rod and a nut assembly.

7. The double-layer double-flow expansion joint according to claim 5 or 6, characterized in that: 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 plates through the nuts.

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