Lining flange cover and pipe orifice connecting structure

Abstract

The invention relates to the technical field of flange covers, and provides a lining flange cover. The lining flange cover comprises a base layer flange cover and a multi-layer lining plate. The second surface of the multi-layer lining plate is attached to the inner surface of the base layer flange cover; a plurality of threaded shafts extending towards the base layer flange cover are welded on the second surface of the multi-layer lining plate; first through holes are formed at the positions, corresponding to the threaded shafts, of the base layer flange cover; and the threaded shafts penetrate through the first through holes corresponding to the threaded shafts, and the ends of the threaded shafts are in threaded connection with fixing nuts. The threaded shafts are welded to the second surface of the multi-layer lining plate, so that the number and installation positions of the threaded shafts are not limited by the position of the sealing face of the multi-layer lining plate, and the stability and reliability of connection between the multi-layer lining plate and the base layer flange cover are improved. A pipe orifice connecting structure is provided, the lining flange cover with high stability and reliability is arranged, so that the reliability of the sealing performance of the pipe orifice connecting structure is improved, and the application range of the pipe orifice connecting structure is widened.

Description

technical field [0001] The invention relates to the technical field of flange covers, in particular to a lining flange cover and a nozzle connection structure. Background technique [0002] The reactor is a common comprehensive reaction vessel in the petrochemical industry. The medium in some reactors is highly corrosive, and the reactor needs to be made of titanium with strong corrosion resistance. During the normal working process of the reactor, for non-process nozzles such as manholes, inspection ports, and spare ports on the reactor, flange covers need to be installed at the nozzles. [0003] The traditional flange cover is all made of titanium, although it can meet the requirements of corrosion resistance, but it has the disadvantage of high material cost. In order to reduce the material cost of the flange cover, the lining flange cover composed of stainless steel base layer and titanium clad layer is currently used instead of the full titanium flange cover, but the p...

AI Technical Summary

Problems solved by technology

However, since the screws are arranged on the sealing surface side of the clad liner, in order to prevent the medium from entering the screw hole and corroding the base flange cover, the installation position of the screw can only be located outside the seal surface of the clad liner and close to the clad liner The position of the edge; this causes only the edge of the composite liner to be connected to the base flange cover, while the middle of the composite liner is not connected to the base flange cover, thus making the connection between the composite liner and the base flange cover poor stability and reliability

Especially when the working environment in the reactor is under normal pressure or slightly negative pressure, the lining flange cover with this structure is very easy to cause the middle bulge of the multilayer liner and cause the sealing effect of the flange cover to fail. It will cause the leakage of the medium in the reactor and cause a safety accident

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