Bellows used for polytetrafluoroethylene compensator and manufacturing method thereof

Abstract

The invention relates to a bellows manufacturing technique, particularly relates to a bellows applied to a polytetrafluor ethylene compensator and a manufacturing method thereof. An inner polytetrafluor ethylene corrugated layer, a metal corrugated layer and an outer polytetrafluor ethylene corrugated layer are successively melted into an integrated body; the two diagonals of the unit grid in the metal corrugated layer are identical with the axial direction and radial direction of the bellows respectively; during the manufacturing process, the two diagonals of the quadrangular unit grid in the metal grid are laid around the polytetrafluor ethylene film in the directions identical with the axial direction and radial direction of the cylindrical mould. The technique is aimed at providing a bellows with strong capability to bear positive and negative pressures for a polytetrafluor ethylene compensator and as well as the manufacturing method. Compared with the prior art, the bellows has certain rigidity, the service life is long, small-bore bellows capable of bearing positive and negative pressures can be manufactured more easily, and the capability of the polytetrafluor ethylene compensator is improved, and so on.

Description

technical field

[0001] The invention relates to a bellows manufacturing technology, in particular to a bellows used for a polytetrafluoroethylene compensator and a manufacturing method thereof. Background technique

[0002] The compensator is an indispensable pipe fitting for compensating the displacement of the pipeline caused by thermal expansion and contraction in petroleum, chemical, smelting and acid making industries, among which the bellows is the core component of the compensator.

[0003] At present, in industries with serious corrosion such as petroleum, chemical industry, smelting and acid making, the commonly used compensators lined with PTFE include metal bellows compensators (patent number: 96240233.8), PTFE metal tube reinforced Compensator (Patent No.: 92104090.3), etc., in these disclosed patented technologies, their bellows are made of polytetrafluoroethylene material, in order to improve the strength of the bellows, a reinforcing layer is provided outside ...

Examples

Embodiment Construction

[0021] Such as figure 1 and figure 2 As shown, the corrugated pipe is sequentially fused together by the inner polytetrafluoroethylene corrugated layer 1, the metal mesh corrugated layer 2, and the outer polytetrafluoroethylene corrugated layer 3. The unit grid 4 in the metal mesh corrugated layer 2 is a quadrilateral structure (such as Figure 4 As shown), the directions of the two diagonals of the quadrilateral are respectively consistent with the axial and radial directions of the bellows.

[0022] Its manufacturing method is as follows:

[0023] ① Wrap the polytetrafluoroethylene film on the cylindrical mold;

[0024] ②Wrap the flat metal mesh on the polytetrafluoroethylene film in the direction that the two diagonals of the quadrilateral unit grid in the flat metal mesh are respectively consistent with the axial and radial directions of the cylindrical mold;

[0025] ③ Wrap the polytetrafluoroethylene film on the metal mesh;

[0026] ④ Wrap the glass fiber tape on t...

technical field

[0001] The invention relates to a bellows manufacturing technology, in particular to a bellows used for a polytetrafluoroethylene compensator and a manufacturing method thereof. Background technique

[0002] The compensator is an indispensable pipe fitting for compensating the displacement of the pipeline caused by thermal expansion and contraction in petroleum, chemical, smelting and acid making industries, among which the bellows is the core component of the compensator.

[0003] At present, in industries with serious corrosion such as petroleum, chemical industry, smelting and acid making, the commonly used compensators lined with PTFE include metal bellows compensators (patent number: 96240233.8), PTFE metal tube reinforced Compensator (Patent No.: 92104090.3), etc., in these disclosed patented technologies, their bellows are made of polytetrafluoroethylene material, in order to improve the strength of the bellows, a reinforcing layer is provided outside ...

Examples

Embodiment Construction

[0021] Such as figure 1 and figure 2 As shown, the corrugated pipe is sequentially fused together by the inner polytetrafluoroethylene corrugated layer 1, the metal mesh corrugated layer 2, and the outer polytetrafluoroethylene corrugated layer 3. The unit grid 4 in the metal mesh corrugated layer 2 is a quadrilateral structure (such as Figure 4 As shown), the directions of the two diagonals of the quadrilateral are respectively consistent with the axial and radial directions of the bellows.

[0022] Its manufacturing method is as follows:

[0023] ① Wrap the polytetrafluoroethylene film on the cylindrical mold;

[0024] ②Wrap the flat metal mesh on the polytetrafluoroethylene film in the direction that the two diagonals of the quadrilateral unit grid in the flat metal mesh are respectively consistent with the axial and radial directions of the cylindrical mold;

[0025] ③ Wrap the polytetrafluoroethylene film on the metal mesh;

[0026] ④ Wrap the glass fiber tape on t...

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