Single-type double-flow-guide expansion joint

Abstract

The utility model relates to a single type double-flow-guide expansion joint which comprises a left connecting pipe, a corrugated pipe, a right connecting pipe and a flow guide pipe, the flow guide pipe is arranged in an inner cavity of the corrugated pipe, and the flow guide pipe is composed of a first pipe, a second pipe and a third pipe; the left end of the first pipe is fixedly welded with the left connecting pipe, the left end of the second pipe is fixedly welded with the first pipe, and the right end of the third pipe is fixedly welded with the right connecting pipe; the right end of the second pipe extends into an inner cavity formed by the third pipe and the corrugated pipe; and the inner wall of the second pipe is in sliding contact connection with the left end of the third pipe. The flow guide pipe consists of a first pipe, a second pipe and a third pipe, the left end of the first pipe is fixedly welded with the left connecting pipe, the left end of the second pipe is fixedly welded with the first pipe, the right end of the third pipe is fixedly welded with the right connecting pipe, and the inner wall of the second pipe is in sliding contact connection with the left end of the third pipe; the flow direction of media does not need to be considered during installation and use, the expansion joint can adapt to various media such as liquid and solid particles, and the service life of the expansion joint is greatly prolonged.

Description

Technical Field

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

[0002] At present, the structure of the existing bellows expansion joint generally includes a bellows, a guide pipe, and left and right connecting pipes. The two ends of the bellows 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] For the existing such bellows expansion joints, since there is a gap between the right end of the guide pipe and the inner wall of the right connecting pipe, 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] Sometimes, the existing heating pipelines need to switch the flow direction of water, and the above-mentioned traditional bellows expansion joints usually cannot meet the requirements. For pipelines transporting solid particles such as pulverized coal, hard particles such as pulverized coal will enter the interior of the 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

[0005] The purpose of the utility model is to provide a single-type double-guide flow expansion joint, which does not need to consider the flow direction of the medium during installation and use, can adapt to various media, and greatly extends the service life of the expansion joint.

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

[0007] A single-type double-guide flow expansion joint includes a left connecting pipe, a bellows, a right connecting pipe, and a guide pipe. The left end of the bellows is connected to the left connecting pipe, the right end of the bellows is connected to the right connecting pipe, and a guide pipe is arranged in the inner cavity of the bellows. The guide pipe is composed of a first pipe, a second pipe, and a third pipe;

[0008] The left end of the first pipe is welded and fixed to the inner wall of the left connecting pipe, the left end of the second pipe is welded to the first pipe, and the right end of the third pipe is welded and fixed to the inner wall of the right connecting pipe;

[0009] The right end of the second pipe extends into the inner cavity formed by the third pipe and the bellows.

[0010] As a preferred technical solution of the utility model, both the first pipe and the third pipe are provided with a tapered structure with both ends expanding outwards; the second pipe is provided with a tapered structure with the left end contracting inwards.

[0011] As a preferred technical solution of the present utility model, the right end of the first pipe is sleeved in the inner cavity of the second pipe and is fixedly welded to the inner wall of the second pipe.

[0012] As a preferred technical solution of the present utility model, a slidable contact connection is formed between the inner wall of the second pipe and the left end of the third pipe.

[0013] As a preferred technical solution of the present utility model, multiple groups of oppositely arranged ear plates are respectively provided on the outer surfaces of the left connecting pipe and the right connecting pipe, and each group of ear plates is connected by a pull rod and a nut assembly.

[0014] 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.

[0015] Beneficial effects of the present utility model: Compared with the prior art, the flow guide pipe of the present utility model is composed of a first pipe, a second pipe and a third pipe; the left end of the first pipe is fixedly welded to the left connecting pipe, the left end of the second pipe is fixedly welded to the first pipe, the right end of the third pipe is fixedly welded to the right connecting pipe, and a slidable contact connection is formed between the inner wall of the second pipe and the left end of the third pipe.

[0016] 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, and the service life of the expansion joint is greatly extended. The present utility model is particularly suitable for installation in a heating system that needs to switch the water flow direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the front view structural schematic diagram of the present utility model.

[0018] In the figure: 1, left connecting pipe; 2, bellows; 3, flow guide pipe; 4, ear plate; 5, pull rod; 6, nut; 7, right connecting pipe; 31, first pipe; 32, second pipe; 33, third pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present utility model will be further described below in conjunction with the drawings and specific embodiments:

[0020] As Figure 1 shown, a single-type double-flow guide expansion joint includes a left connecting pipe 1, a bellows 2, a right connecting pipe 7 and a flow guide pipe 3. The left end of the bellows 2 is connected to the left connecting pipe 1, the right end of the bellows 2 is connected to the right connecting pipe 7, and a flow guide pipe 3 is provided in the inner cavity of the bellows 2. The flow guide pipe 3 is composed of a first pipe 31, a second pipe 32 and a third pipe 33. The left end of the first pipe 31 is fixedly welded to the inner wall of the left connecting pipe 1, the left end of the second pipe 32 is fixedly welded to the first pipe 31, and the right end of the third pipe 33 is fixedly welded to the inner wall of the right connecting pipe 7. The right end of the second pipe 32 extends into the inner cavity formed by the third pipe 33 and the bellows 2.

[0021] In this embodiment, both the first pipe 31 and the third pipe 33 are provided with a conical structure that expands outward at both ends; the second pipe 32 is provided with a conical structure that contracts inward at the left end. The right end of the first pipe 31 is sleeved in the inner cavity of the second pipe 32 and is fixedly welded to the inner wall of the second pipe 32. A slidable contact connection is formed between the inner wall of the second pipe 32 and the left end of the third pipe 33.

[0022] On the outer surfaces of the left connection pipe 1 and the right connection pipe 2, a plurality of groups of ear plates 4 are respectively provided; a pair of ear plates 4 arranged oppositely are connected by a component of a pull rod 5 and a nut 6; both ends of the pull rod 5 are respectively provided with a pair of nuts 6, and are connected and fixed to the ear plates 4 through the nuts 6.

[0023] The above embodiments are only limited to illustrate the concept and technical features of the present invention, and are intended 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 shall be covered within the protection scope of the present invention.

Claims

1. A single-mode double-flow expansion joint, comprising a left connection pipe, a corrugated pipe, a right connection pipe and a flow guide pipe. The left end of the corrugated pipe is connected to the left connection pipe, the right end of the corrugated pipe is connected to the right connection pipe, and a flow guide pipe is arranged in the inner cavity of the corrugated pipe. It is characterized in that: The diversion pipe is composed of a first pipe, a second pipe and a third pipe; The left end of the first pipe is fixedly welded to the inner wall of the left connection pipe, the left end of the second pipe is welded to the first pipe, and the right end of the third pipe is fixedly welded to the inner wall of the right connection pipe; The right end of the second pipe extends into the inner cavity formed by the third pipe and the corrugated pipe.

2. The single-mode double-flow expansion joint according to claim 1, characterized in that: Both the first pipe and the third pipe are configured as conical structures with both ends expanding outwards; the second pipe is configured as a conical structure with the left end contracting inwards.

3. The single-mode double-diversion expansion joint according to claim 2, characterized in that: The right end of the first pipe is sleeved in the inner cavity of the second pipe and fixedly welded to the inner wall of the second pipe.

4. The single-type double-diversion expansion joint according to claim 3, wherein: A slidable contact connection is formed between the inner wall of the second pipe and the left end of the third pipe.

5. The single-mode double-diversion expansion joint according to claim 1, characterized in that: Multiple groups of oppositely arranged ear plates are respectively provided on the outer surfaces of the left connection pipe and the right connection pipe, and each group of ear plates is connected by a pull rod and a nut assembly.

6. The single-mode double-diversion expansion joint according to claim 5, 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 plate through the nuts.

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