Single pipe free telescopic structure of high-temperature air preheater

Abstract

A single pipe free telescopic structure of a high-temperature air preheater relates to a high-temperature air preheater, belongs to the field of connection modes between a heating pipe and a tubular plate and comprises the tubular plate and a heat exchanging plate vertically connected on the tubular plate; a sealing system is arranged between the heat exchanging plate and the tubular plate and comprises a filling top block, a filling box and fillings; the filling top block and the filling box are respectively sleeved outside the heat exchanging pipe, the filling top block is welded on the tubular plate, the filling box is in thread connection on the filling top block, and the fillings are filed between the filling top block and the filling box; at least one installation groove is arranged on the contact face between the filling top block and the heat exchanging pipe, and at least one installation groove is arranged on the contact face between the filling box and the heat exchanging pipe; and seal rings are respectively arranged in the installation grooves of the filling top block and the filling box. The single pipe free telescopic structure of the high-temperature air preheater avoids the incomplete sealing or blocking phenomena easily caused by the connection structure between a pipe fitting and the tubular plate, and solves the problem of difficulty in replacement of the seal rings and the filling box at the same time.

Description

technical field [0001] The invention relates to the technical field of a connection mode between a heating tube and a tube sheet in a high-temperature air preheater. Background technique [0002] At present, the high-temperature air preheater disclosed has a single packing seal or a single packing plus a sealing ring structure in which the heating tube is free to expand and contract relative to the tube sheet. Due to the high operating temperature of the equipment, the tube sheet and stuffing box are prone to Irregular expansion leads to incomplete sealing or jamming. Although the structure of single packing plus sealing ring can be improved, the sealing ring cannot be replaced, which makes maintenance inconvenient, and the thread is easily damaged, and the stuffing box is not easy to replace. Contents of the invention [0003] The invention provides a single-tube free telescopic structure of a high-temperature air preheater, aiming to solve the problem that the existing s...

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Problems solved by technology

[0003] The invention provides a single-tube free telescopic structure of a high-temperature air preheater, aiming to solve the problem that the existing structure connecting the pipe fittings and the tube sheet easily leads to incomplete sealing or jamming, and at the same time solves the problem that the sealing ring and stuffing box are not easy to replace defect

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