Welding process and application device of bellows assembly

Abstract

The invention discloses a welding process of a corrugated pipe assembly and an application device thereof. The welding process steps include: a. welding to form a master piece; b. welding to form a corrugated tube core; c. welding to form a corrugated tube; d. welding to form a corrugated tube Tube assembly; leak test. A bellows sealing device, characterized in that it includes a bellows assembly, a casing, a static ring and a moving ring, wherein: the left end of the casing is embedded in a groove surface, the static ring is arranged in a step surface, and the The moving ring is arranged close to the end face of the static ring, and the contact surface forms a sealing end face. High welding efficiency, good precision, stable elastic compensation and long service life.

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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