Lining type stainless steel mechanical connection compound pipe fitting

Abstract

The invention relates to a lining type stainless steel mechanical connection compound pipe fitting comprising a connection shell, an outer pipe connection assembly arranged at one end of the connection shell, and an inner pipe connection assembly arranged at the other end of the connection shell. The inner pipe connection assembly comprises a thrust ring. An expansion sleeve is coaxially fixed tothe middle portion of the thrust ring. A supporting sleeve is connected to the expansion sleeve in a sleeving manner. A limiting ring A used for making contact with the end portion of a pipe is arranged on one end portion of the supporting sleeve, and a seal block is fixed to the other end portion of the supporting sleeve. A gradually-shrinking hole is formed in the middle portion of the seal block. The outer pipe connection assembly comprises a guide ring and further comprises a seal ring. The section of the seal ring is of an arc-shaped structure. The outer pipe connection assembly further comprises a push sleeve used for pushing the seal ring to deform. The push sleeve comprises an outer wall connection sleeve making contact with the outer wall of an outer pipe. A limiting ring B used for making contact with the end portion of the pipe is arranged on one end portion of the outer wall connection sleeve. A push ring is arranged on the outer wall of the outer wall connection sleeve. The outer wall of the push ring is of a gradually-expanding structure.

Description

technical field [0001] The invention relates to a liner type stainless steel mechanically connected composite pipe fitting, which belongs to the field of pipe connecting pieces. Background technique [0002] Because of its special structure, the double-layer pipe is often made of stainless steel inner wall and outer wall made of cast iron and other materials, which not only meets the anti-corrosion, but also meets certain mechanical properties; because the outer wall is generally poor in corrosion resistance, but its mechanical properties are relatively high. Excellent cast iron material, so its corrosion resistance is poor. For the connecting pipe fittings of double-layer pipes, it is necessary to achieve double sealing of the inner wall and outer wall, and at the same time, it is necessary to meet the isolation of the end area of ​​the double-layer pipes and reduce the liquid and gas. The overflow of the overflow causes the corrosion of the outer wall, which affects the st...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: to overcome the technical problem of poor durability of single-layer sealing connection of double-layer pipes in the prior art, and to provide a lined stainless steel mechanically connected composite pipe fitting

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