Reducing corrugated pipe expansion joint

Abstract

The utility model discloses a reducing corrugated pipe expansion joint which comprises a reducing pipeline, a telescopic pipeline and a first flange plate, the telescopic pipeline is installed between the reducing pipeline and the first flange plate, and a connecting rod is further installed between the reducing pipeline and the first flange plate. The reducing pipeline is composed of a reducing pipe body, a second flange plate and a third flange plate, and the second flange plate and the third flange plate are arranged at the two ends of the reducing pipe body respectively. According to the corrugated pipe expansion joint, the reducing pipeline is adopted, the diameter of the part, located on the second flange plate, of the reducing pipe body is larger than that of the part, located on the third flange plate, of the reducing pipe body, and real reducing of the corrugated pipe expansion joint is achieved by changing the inner diameter of the pipeline instead of singly changing the diameter of the flange.

Description

Technical Field

[0001] The utility model relates to the technical field of bellows expansion joints, in particular to a variable diameter bellows expansion joint. Background Art

[0002] Bellows expansion joint, also called compensator or expansion joint, is an expansion joint made of metal bellows, which consists of bellows (an elastic element) and flange, guide tube and other accessories. By utilizing the effective expansion and contraction deformation of the bellows, it can expand and contract along the pipeline axis and allow a small amount of bending to compensate for the assembly errors caused by axial, lateral and angular displacements, and is used for axial length compensation on pipelines.

[0003] The existing announcement number CN220849820U discloses a variable diameter bellows expansion joint for the exhaust pipeline of the main engine of a ship. The bellows expansion joint adopts different flanges at both ends to achieve diameter change; but it does not achieve the real diameter change of the pipeline. Therefore, how to realize the function of the expansion joint and achieve the real diameter change function of the pipeline is a technical problem we want to solve. For this reason, we propose a variable diameter bellows expansion joint. Utility Model Content

[0004] The utility model aims to provide a variable diameter bellows expansion joint to solve the problems in the prior art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a variable diameter bellows expansion joint, comprising a variable diameter pipe, a telescopic pipe and a first flange plate, a telescopic pipe is installed between the variable diameter pipe and the first flange plate, and a connecting rod is also installed between the variable diameter pipe and the first flange plate; the variable diameter pipe is composed of a variable diameter pipe body, a second flange plate and a third flange plate, and the second flange plate and the third flange plate are respectively arranged at both ends of the variable diameter pipe body.

[0006] Preferably, the diameter of the reducer body at the second flange plate is greater than the diameter of the reducer body at the third flange plate, and the reducer body, the second flange plate and the third flange plate are an integrated structure.

[0007] Preferably, the telescopic pipe comprises a telescopic pipe body, and reinforcing ribs are welded at the annular grooves on the outer side of the telescopic pipe body.

[0008] Preferably, both ends of the telescopic tube body are provided with vertical structures, the second flange plate is provided with an annular slot matched with one of the vertical structures, and the other vertical structure is welded to the outer side of the first flange plate.

[0009] Preferably, the connecting rod is mounted on the first flange plate and the second flange plate.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] 1. Use a reducer pipe. The diameter of the reducer body at the second flange plate is larger than the diameter of the reducer body at the third flange plate. By changing the inner diameter of the pipe, the bellows expansion joint can achieve true diameter change instead of simply changing the flange diameter.

[0012] 2. The annular grooves on the outside of the telescopic tube body are welded with reinforcing ribs, which can protect the telescopic joint of the telescopic tube body and extend the reciprocating service life of the telescopic tube body.

[0013] 3. Both ends of the telescopic tube body are provided with vertical structures, the second flange plate is provided with an annular slot matching one of the vertical structures, and the other vertical structure is welded to the outside of the first flange plate, so that the telescopic tube body can be stably installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a side view of the utility model;

[0017] Figure 3 This utility model Figure 2 Sectional view of AA.

[0018] In the figure: 1, reducer pipe; 2, connecting rod; 3, telescopic pipe; 4, first flange plate; 11, reducer pipe body; 12, second flange plate; 13, third flange plate; 31, telescopic pipe body; 32, reinforcing ribs. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is claimed, but merely represents selected embodiments of the utility model.

[0020] See also Figure 1-3 In the embodiment of the utility model, a variable diameter bellows expansion joint comprises a variable diameter pipe 1, a telescopic pipe 3 and a first flange plate 4, wherein the telescopic pipe 3 is installed between the variable diameter pipe 1 and the first flange plate 4, and a connecting rod 2 is also installed between the variable diameter pipe 1 and the first flange plate 4;

[0021] The reducer pipe 1 is composed of a reducer body 11, a second flange plate 12 and a third flange plate 13. The second flange plate 12 and the third flange plate 13 are respectively arranged at both ends of the reducer body 11; the diameter of the reducer body 11 at the second flange plate 12 is larger than the diameter of the reducer body 11 at the third flange plate 13; the reducer body 11, the second flange plate 12 and the third flange plate 13 are an integrated structure, the diameter of the reducer body at the second flange plate is larger than the diameter of the reducer body at the third flange plate, and the real diameter change of the bellows expansion joint is achieved by changing the inner diameter of the pipeline, rather than simply changing the diameter of the flange; the connecting rod 2 is installed on the first flange plate 4 and the second flange plate 12.

[0022] The telescopic pipe 3 includes a telescopic tube body 31, and reinforcing ribs 32 are welded at the annular grooves on the outer side of the telescopic tube body 31. The reinforcing ribs 32 can protect the telescopic joint of the telescopic tube body 31 and extend the reciprocating service life of the telescopic tube body 31; vertical structures are provided at both ends of the telescopic tube body 31, and the second flange plate 12 is provided with an annular slot that cooperates with one of the vertical structures, and the other vertical structure is welded to the outer side of the first flange plate 4.

[0023] The working principle of the utility model is: the distance between the first flange plate 4 and the second flange plate 12 can be adjusted by the connecting rod 2, so as to realize the function of the expansion joint; the diameter of the reducer body located at the second flange plate is greater than the diameter of the reducer body located at the third flange plate, and the real diameter change of the bellows expansion joint is realized by changing the inner diameter of the pipeline.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A variable diameter bellows expansion joint, characterized in that: It comprises a diameter-reducing pipe (1), a telescopic pipe (3) and a first flange plate (4), wherein the telescopic pipe (3) is installed between the diameter-reducing pipe (1) and the first flange plate (4), and a connecting rod (2) is also installed between the diameter-reducing pipe (1) and the first flange plate (4); The reducer pipe (1) is composed of a reducer pipe body (11), a second flange plate (12) and a third flange plate (13), and the second flange plate (12) and the third flange plate (13) are respectively arranged at both ends of the reducer pipe body (11).

2. The variable diameter bellows expansion joint according to claim 1, characterized in that: The diameter of the reducer body (11) at the second flange plate (12) is greater than the diameter of the reducer body (11) at the third flange plate (13); the reducer body (11), the second flange plate (12) and the third flange plate (13) are an integrated structure.

3. A variable diameter bellows expansion joint according to claim 1 or 2, characterized in that: The telescopic pipe (3) comprises a telescopic pipe body (31), and reinforcing ribs (32) are welded at the annular grooves on the outside of the telescopic pipe body (31).

4. The variable diameter bellows expansion joint according to claim 3, characterized in that: Both ends of the telescopic tube body (31) are provided with vertical structures, the second flange plate (12) is provided with an annular slot matched with one of the vertical structures, and the other vertical structure is welded to the outer side of the first flange plate (4).

5. A variable diameter bellows expansion joint according to claim 1 or 2, characterized in that: The connecting rod (2) is mounted on the first flange plate (4) and the second flange plate (12).

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