Metal expansion joint with drawing type flange lining structure

Abstract

The utility model relates to the technical field of expansion joints, in particular to a metal expansion joint with a drawing type flange lining structure, which comprises an upstream flange, a connecting pipe, a corrugated pipe, a pipeline flange, a downstream flange, a flange gasket and a straight cylinder drawing type flange lining 7. And meanwhile, during maintenance, the metal expansion joint connected by the flange is convenient to replace by using a drawing type flange lining cylinder, and deposited media are easy to clean. And the expected requirement of a user on the safe operation period of pipeline equipment is met.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion joints, in particular to a metal expansion joint with a pull-out flange lining structure. Background Technique

[0002] A metal expansion joint is a flexible structure arranged on a container shell or pipeline, used to compensate for additional stresses caused by temperature differences and mechanical vibrations. When the pipeline medium contains powder, the wear on the lining cylinder of the expansion joint is relatively serious, or it is easy to deposit in the bellows of the expansion joint. To facilitate maintenance and replacement, a metal expansion joint with flange connection is often selected.

[0003] During the operation of the system with a metal expansion joint connected by flanges, due to the powder in the medium, the weld at the root of the lining cylinder welded and fixed on the inner wall of the nozzle is easily worn off. On the one hand, this causes the detached lining to move freely in the pipeline with the medium, resulting in damage to the pipeline or equipment. On the other hand, the bellows is directly eroded by the powder and fails in a short period, affecting the safe production operation of the pipe system. In addition, when the medium may flow back, the powder medium is easily deposited in the gap between the bellows and the lining cylinder and is not easy to clean. This weakens the displacement absorption ability of the bellows and causes damage to the system. Content of the Utility Model

[0004] The purpose of the utility model is to provide a metal expansion joint with a pull-out flange lining structure to solve the problems existing in the prior art of the lining cylinder of the flange-connected expansion joint with the medium being powder.

[0005] The invention provides a metal expansion joint with a pull-out flange lining structure. The pull-out flange lining is composed of a flange disc and a straight pipe welded together. The flange disc of the pull-out flange lining is clamped and fixed between the upstream flange and its supporting pipeline flange. There is a gap between the pull-out flange lining and the inner wall of its supporting pipeline, and the gap between the pull-out flange lining and its supporting pipeline is less than the deformation degree of the expansion joint.

[0006] Two flange gaskets are installed between the flange disc of the pull-out flange lining and the upstream flange and its supporting pipeline flange. One of the flange gaskets is clamped inside the flange disc of the pull-out flange lining, and the other flange gasket is clamped outside the flange disc of the pull-out flange lining.

[0007] One flange gasket is installed between the downstream flange and its supporting pipeline flange. The connection between the flange disc of the pull-out flange lining and the upstream flange and its supporting pipeline flange, and the connection between the downstream flange and its supporting pipeline flange require at least three flange gaskets.

[0008] Furthermore, the present invention provides a metal expansion joint with a pull-out flange lining structure. The pull-out flange lining is provided as a straight tube pull-out flange lining, which is composed of a straight tube pull-out flange lining flange disc and a straight tube pull-out flange lining straight tube welded together. The straight tube pull-out flange lining flange disc of the straight tube pull-out flange lining is clamped and fixed between the upstream flange and the pipeline flange supporting it. There is a gap between the flange lining and the inner wall of the pipeline supporting it, and the gap between the flange lining and the inner wall of the pipeline supporting it is less than the deformation degree of the expansion joint.

[0009] Furthermore, the present invention provides a metal expansion joint with a pull-out flange lining structure. The pull-out flange lining is provided as a Z-shaped pull-out flange lining, which is composed of a Z-shaped pull-out flange lining flange disc and a Z-shaped tube welded together. The Z-shaped pull-out flange lining flange disc of the Z-shaped pull-out flange lining is clamped and fixed between the upstream flange and the pipeline flange supporting it. There is a gap between the Z-shaped pull-out flange lining and the inner wall of the pipeline supporting it, and the gap between the Z-shaped pull-out flange lining and the inner wall of the pipeline supporting it is less than the deformation degree of the expansion joint.

[0010] Furthermore, the present invention provides a metal expansion joint with a pull-out flange lining structure. The pull-out flange lining is provided as a reducing pull-out flange lining cylinder, which is composed of a reducing pull-out flange disc and a reducing tube welded together. When installing the expansion joint, the reducing pull-out flange disc of the single-piece reducing pull-out flange lining is clamped and fixed between the upstream flange and the pipeline flange supporting it. There is a gap between the single-piece reducing pull-out flange lining and the inner wall of the pipeline supporting it, and the gap between the single-piece reducing pull-out flange lining and the inner wall of the pipeline supporting it is less than the deformation degree of the expansion joint.

[0011] The utility model has the following beneficial effects: The technology to be protected in this technical solution is mainly the new expansion joint with a pull-out flange inner structure. The structural innovation points of the expansion joint are as follows:

[0012] (1) The single-piece pull-out flange lining cylinder clamped and fixed between the upstream flange of the expansion joint and the pipeline flange supporting it does not need to be welded to the nozzle. This ensures that the pull-out flange lining cylinder will not fall off due to the abrasion of the weld during the in-service period of the expansion joint, and the medium flow is stable. At the same time, during shutdown maintenance, the powder deposited between the lining cylinder and the bellows is easily cleared when the lining cylinder is pulled out; in addition, if the lining cylinder is abraded by the powder, only the lining cylinder needs to be replaced. The pull-out flange lining is convenient to pull out and replace, and there is no need to replace the whole expansion joint, reducing the operation and maintenance cost.

[0013] (2) When the expansion joint only absorbs axial displacement or absorbs a small amount of lateral or angular displacement, the gap △ between the lining and the inner wall of the nozzle is small. Using a straight tube pull-out flange lining can reduce the manufacturing cost.

[0014] (3) When the lateral or angular displacement absorbed by the large-diameter expansion joint is relatively large, the gap △ between the inner lining and the inner wall of the nozzle needs to be larger. The Z-shaped pull-out flange inner lining is adopted. On the one hand, the large-diameter Z-shaped pipe is easy to be expanded and formed. On the other hand, it ensures that the deformation of the expansion joint does not interfere.

[0015] (4) When the lateral or angular displacement absorbed by the small-diameter expansion joint is relatively large, the gap △ between the inner lining and the inner wall of the nozzle needs to be larger. The reduced-diameter pull-out flange inner lining is adopted. On the one hand, the small-diameter Z-shaped pipe cannot be expanded and formed, and the standard reduced diameter is directly adopted. On the other hand, it ensures that the deformation of the expansion joint does not interfere. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 Expansion joint with a novel straight-barrel pull-out flange inner lining structure.

[0018] Figure 2 Structure diagram of the novel straight-barrel pull-out flange inner lining 7.

[0019] Figure 3 Expansion joint with a novel Z-shaped pull-out flange inner lining structure.

[0020] Figure 4 Structure diagram of the novel Z-shaped pull-out flange inner lining 8.

[0021] Figure 5 Expansion joint with a novel reduced-diameter pull-out flange inner lining structure.

[0022] Figure 6 Structure diagram of the novel reduced-diameter pull-out flange inner lining 9.

[0023] Illustration: 1 - upstream flange, 2 - nozzle, 3 - bellows, 4 - gap △, 5 - downstream flange, 6 - flange gasket, 7 - straight-barrel pull-out flange inner lining 7, 7-1 - straight-barrel pull-out flange inner lining flange disc, 7-2 - straight-barrel pull-out flange inner lining straight pipe, 8 - Z-shaped pull-out flange inner lining, 8-1 - Z-shaped pull-out flange inner lining flange disc, 8-2 - Z-shaped pipe, 9 - reduced-diameter pull-out flange inner lining cylinder, 9-1 - reduced-diameter pull-out flange disc, 9-2 - reduced-diameter pipe. Detailed Embodiments

[0024] As Figures 1 to 6As shown in the figure, the embodiment of the present utility model provides a metal expansion joint with a pull-out flange lining structure. In view of the problems existing in the prior art of the lining cylinder of the expansion joint for the flange connection of pipelines with powders as the medium, the present utility model has specifically carried out research and development and developed a metal expansion joint with a pull-out flange lining structure.

[0025] The present utility model is generally applicable to single-axis type expansion joints, single-hinge type expansion joints, single-universal hinge type expansion joints, etc. for flange connections with powders as the medium.

[0026] The present invention provides a metal expansion joint with a pull-out flange lining structure, including: the pull-out flange lining is composed of a flange disc and a straight pipe welded together. The flange disc of the pull-out flange lining is clamped and fixed between the upstream flange 1 and the pipeline flange supporting it. There is a gap between the pull-out flange lining and the inner wall of the pipeline supporting it, and the gap between the pull-out flange lining and the pipeline supporting it is less than the deformation degree of the expansion joint.

[0027] A flange gasket 6 is installed between the downstream flange 5 and the pipeline flange supporting it. The connection between the flange disc of the pull-out flange lining and the upstream flange 1 and the pipeline flange supporting it, and the connection between the downstream flange 5 and the pipeline flange supporting it require at least three flange gaskets 6.

[0028] Specifically, the present invention provides a metal expansion joint with a pull-out flange lining structure. The pull-out flange lining is set as a straight-tube pull-out flange lining 7. The straight-tube pull-out flange lining 7 is composed of a straight-tube pull-out flange lining flange disc 7-1 and a straight-tube pull-out flange lining straight pipe 7-2 welded together. The straight-tube pull-out flange lining flange disc 7-1 of the straight-tube pull-out flange lining 7 is clamped and fixed between the upstream flange 1 and the pipeline flange supporting it. There is a gap between the flange lining 7 and the inner wall of the pipeline supporting it, and the gap between the flange lining 7 and the inner wall of the pipeline supporting it is less than the deformation degree of the expansion joint. The gap △ between the lining and the inner wall of the pipe is calculated by the deflection of the lateral or angular displacement absorbed by the expansion joint. This gap must ensure that the lining does not interfere with the deformation of the expansion joint. This ensures that the lining cylinder will not fall off during the service period of the expansion joint and the medium flow is stable. At the same time, during shutdown maintenance, the powders deposited between the straight-tube pull-out flange lining 7 and the corrugated pipe 3 are easily cleared when the lining is pulled out; in addition, if the lining cylinder abraded by the powders needs to be updated, the pull-out flange lining is convenient to pull out and replace. The △ in the gap △ can be checked at the middle positions in Appendix Figure 1 、 3 and 5.

[0029] Specifically, the present invention provides a metal expansion joint with a pull-out flange lining structure. The pull-out flange lining is set as a Z-shaped pull-out flange lining 8. The Z-shaped pull-out flange lining 8 is composed of a Z-shaped pull-out flange lining flange disc 8-1 and a Z-shaped pipe 8-2 welded together. The Z-shaped pull-out flange lining flange disc 8-1 of the Z-shaped pull-out flange lining 8 is clamped and fixed between the upstream flange 1 and its supporting pipe flange. There is a gap between the Z-shaped pull-out flange lining 8 and the inner wall of its supporting pipe, and the gap between the Z-shaped pull-out flange lining 8 and the inner wall of its supporting pipe is less than the deformation degree of the expansion joint. The gap △ between the lining and the inner wall of the pipe is calculated by the deflection of the lateral or angular displacement absorbed by the expansion joint. This gap must satisfy that the lining does not interfere with the deformation of the expansion joint. This ensures that the lining cylinder will not fall off during the operation of the expansion joint, and the medium flows smoothly. At the same time, during shutdown maintenance, the powder deposited between the Z-shaped pull-out flange lining 8 and the bellows 3 is easily cleared when the lining is pulled out; in addition, if the lining cylinder abraded by the powder needs to be updated, the pull-out flange lining is convenient to pull out and replace.

[0030] Specifically, the present invention provides a metal expansion joint with a pull-out flange lining structure. The pull-out flange lining is set as a reduced-diameter pull-out flange lining cylinder 9. The reduced-diameter pull-out flange lining cylinder 9 is composed of a reduced-diameter pull-out flange disc 9-1 and a reduced-diameter pipe 9-2 welded together. When the expansion joint is installed, the reduced-diameter pull-out flange disc 9-1 of the reduced-diameter single-piece pull-out flange lining 9 is clamped and fixed between the upstream flange 1 and its supporting pipe flange. There is a gap between the reduced-diameter single-piece pull-out flange lining 9 and the inner wall of its supporting pipe, and the gap between the reduced-diameter single-piece pull-out flange lining 9 and the inner wall of its supporting pipe is less than the deformation degree of the expansion joint. The gap △ between the lining and the inner wall of the pipe is calculated by the deflection of the lateral or angular displacement absorbed by the expansion joint. This gap must satisfy that the lining does not interfere with the deformation of the expansion joint. This ensures that the lining cylinder will not fall off during the operation of the expansion joint, and the medium flows smoothly. At the same time, during shutdown maintenance, the powder deposited between the lining cylinder 9 and the bellows 3 is easily cleared when the lining is pulled out; in addition, if the lining cylinder abraded by the powder needs to be updated, the pull-out flange lining is convenient to pull out and replace.

[0031] The structure of the new metal expansion joint with a pull-out flange lining structure is as shown in Appendix Figure 1 to Appendix Figure 6 shown. Compared with the prior art, the present utility model mainly developed a new metal expansion joint structure with a pull-out flange lining structure. The specific scheme content is as follows:

[0032] The surface roughness of both sides of the flange disc of the above pull-out flange lining structure is the same as that of the flange. At the same time, when installing the flange of the expansion joint with a single-piece pull-out flange lining structure, 1 flange gasket 6 needs to be installed in front of and behind the lining cylinder respectively. A total of 3 flange gaskets 6 are required when the expansion joint is installed.

[0033] In the above technical solutions, the selection of the corrugated pipe, the adapter pipe, and the flange already exists in the existing solutions. In the newly developed solution, the inner lining component has been innovated, and the technical solution of the pull-out flange inner lining cylinder is newly developed.

[0034] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A metal expansion joint with a pull-out flange lining structure, characterized in that, Comprising; The draw - out flange inner lining is composed of a flange disc and a straight pipe welded together. The flange disc of the draw - out flange inner lining is clamped and fixed between the upstream flange (1) and the corresponding pipeline flange. There is a gap between the draw - out flange inner lining and the inner wall of its corresponding pipeline, and the gap between the draw - out flange inner lining and its corresponding pipeline is less than the deformation degree of the expansion joint; Two flange gaskets (6) are installed between the flange disc of the draw - out flange inner lining and the upstream flange (1) and its corresponding pipeline flange. One of the flange gaskets (6) is clamped inside the flange disc of the draw - out flange inner lining, and the other flange gasket (6) is clamped outside the flange disc of the draw - out flange inner lining; One flange gasket (6) is installed between the downstream flange (5) and its corresponding pipeline flange. The number of flange gaskets (6) required for the connection between the flange disc of the draw - out flange inner lining and the upstream flange (1) and its corresponding pipeline flange, and the connection between the downstream flange (5) and its corresponding pipeline flange is at least three.

2. The metal expansion joint with a pull-out flange lining structure according to claim 1, characterized in that The draw - out flange inner lining is set as a straight - tube draw - out flange inner lining (7). The straight - tube draw - out flange inner lining (7) is composed of a straight - tube draw - out flange inner - lining flange disc (7 - 1) and a straight - tube draw - out flange inner - lining straight pipe (7 - 2) welded together. The straight - tube draw - out flange inner - lining flange disc (7 - 1) of the straight - tube draw - out flange inner lining (7) is clamped and fixed between the upstream flange (1) and the corresponding pipeline flange. There is a gap between the flange inner lining (7) and the inner wall of its corresponding pipeline, and the gap between the flange inner lining (7) and the inner wall of its corresponding pipeline is less than the deformation degree of the expansion joint.

3. A metal expansion joint with a pull-out flange lining structure according to claim 1, characterized in that, The draw - out flange inner lining is set as a Z - shaped draw - out flange inner lining (8). The Z - shaped draw - out flange inner lining (8) is composed of a Z - shaped draw - out flange inner - lining flange disc (8 - 1) and a Z - shaped pipe (8 - 2) welded together. The Z - shaped draw - out flange inner - lining flange disc (8 - 1) of the Z - shaped draw - out flange inner lining (8) is clamped and fixed between the upstream flange (1) and the corresponding pipeline flange. There is a gap between the Z - shaped draw - out flange inner lining (8) and the inner wall of its corresponding pipeline, and the gap between the Z - shaped draw - out flange inner lining (8) and the inner wall of its corresponding pipeline is less than the deformation degree of the expansion joint.

4. The metal expansion joint with a pull-out flange lining structure according to claim 1, characterized in that The draw - out flange inner lining is set as a reducing draw - out flange inner - lining cylinder (9). The reducing draw - out flange inner - lining cylinder (9) is composed of a reducing draw - out flange disc (9 - 1) and a reducing pipe (9 - 2) welded together. When the expansion joint is installed, the reducing draw - out flange disc (9 - 1) of the single - piece reducing draw - out flange inner lining (9) is clamped and fixed between the upstream flange (1) and the corresponding pipeline flange. There is a gap between the single - piece reducing draw - out flange inner lining (9) and the inner wall of its corresponding pipeline, and the gap between the single - piece reducing draw - out flange inner lining (9) and the inner wall of its corresponding pipeline is less than the deformation degree of the expansion joint.

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