Welding process and application device of corrugated pipe assembly

Abstract

The invention discloses a welding process and an application device of a corrugated pipe assembly. The welding process includes steps that a, primary and secondary pieces are formed by welding; b, a corrugated pipe core is formed by welding; c, a corrugated pipe is formed by welding; d, the corrugated pipe assembly is formed by welding; a sealing performance test is performed. A corrugated pipe sealing device is characterized by comprising the corrugated pipe assembly, a casing, a stationary ring and a moving ring, wherein the left end of the casing is embedded into a groove face, the stationary ring is arranged in a step surface, the moving ring is attached to the end face of the stationary ring, and a contact face forms a sealing end face. The welding process and the application device of the corrugated pipe assembly have the advantages that the welding efficiency is high, the accuracy is good, the elastic compensation is stable, and the service life is long.

Description

technical field [0001] The invention relates to a mechanical sealing device, in particular to a welding process of a bellows assembly and an application device thereof. Background technique [0002] Welded metal bellows mechanical seals are widely used in various centrifugal pumps, and are popular for their characteristics of uniform elastic force, natural balance, convenient installation, and wide temperature range. Welded metal bellows has a variety of structural forms and welding methods. The welding methods are mainly divided into inner circle welding and outer circle welding; in actual use, there are the following problems: a. The weakest link of the bellows is the welding between the two ends and the substrate, which is easy to fail Welding and weld strength are not enough; b. After welding, the bellows need heat treatment and stable length. Usually, the two ends are fixed, and the bellows assembly is also called "soft" by stretching and pressing. Extrusion and collis...

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Problems solved by technology

Welded metal bellows has a variety of structural forms and welding methods. The welding methods are mainly divided into inner circle welding and outer circle welding; in actual use, there are the following problems: a. The weakest link of the bellows is the welding between the two ends and the substrate, which is easy to fail Welding and weld strength are not enough; b. After welding, the bellows need heat treatment and stable length. Usually, the two ends are fixed, and the bellows assembly is also called "soft" by stretching and pressing. Extrusion and collision of the metal parts at the ends will easily cause unrecoverable deformation or damage to the waveforms of the wave plates at both ends, affect the strength of the inner round solder ball, and is not conducive to the elastic linear relationship of the bellows; c. The welding accuracy of the bellows is high, so In actual production, in order to ensure the accuracy, the welding efficiency is often low, especially when welding the outer circle, the method used is single-wave welding, that is, after one wave of welding, the tooling is disassembled, and then a wave of welding is returned. The concentricity of the wave core in this welding method It is difficult to guarantee the heat dissipation of the welding mushroom during welding, the welding strength is low, and the welding efficiency is low; d. The bellows assembly can be equipped with a static ring or a moving ring, and its position can be set on the atmosphere side or the medium side. The existing bellows The tube cores of the components are directly exposed to the outside without protection measures. Dust on the atmospheric side or impurities on the medium side can easily enter between the wave plates of the corrugated tube core, causing the elastic failure of the corrugated tube and affecting the stability of the sealing end face; e, dynamic When the ring rotates with the shaft, the contact between the moving ring and the static ring will cause the beating and resonance of the static ring. Therefore, elastic compensation parts are required to provide elastic compensation. The bellows assembly is the most advanced elastic compensation assembly. The existing bellows are used in practice. In application, with the beating and resonance of the static ring, it is easy to move radially, and lacks a structure to limit its radial movement, so the elastic compensation effect is poor

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