Twist-off prevention mechanical sealing device of vapor-liquid full-flow screw power machine

Abstract

A twist-off prevention mechanical sealing device of a vapor-liquid full-flow screw power machine comprises a moving ring (1), a moving ring shaft sleeve (4), a corrugated tube compensation stationary ring (2) which is arranged on the left side of the moving ring (1) and a spring compensation stationary ring (3) which is arranged on the right side of the moving ring (1); the corrugated tube compensation stationary ring (2) is connected with a connecting seat (24) through a corrugated tube tailstock (22) in a welding mode; a blocking block (25) is arranged on a lateral end surface of the connecting seat (24); and an outer ring surface of a stationary ring seat (23) is provided with a blocking groove (27) which is matched with the blocking block (25) to limit the rotation of the stationary ring seat (23). The twist-off prevention mechanical sealing device of the vapor-liquid full-flow screw power machine has the advantages of preventing the stationary ring seat (23) from driving a metal corrugated tube (21) to twist, preventing the metal corrugated tube (21) from causing fatigue and twist-off and prolonging the service life.

Description

technical field [0001] The invention relates to a mechanical seal device for a screw shaft of a vapor-liquid full-flow screw power machine. Background technique [0002] The vapor-liquid full-flow screw power machine consists of a casing, a pair of screw rotors that rotate and cooperate with each other, a mechanical seal, a synchronous gear, a low-pressure end seat, and a high-pressure end seat. Synchronous gears, bearings, and mechanical seals are respectively installed in the low-pressure end seat and high-pressure end seat. The mechanical seal seals the screw rotor shaft. There are steam inlet and outlet pipes at both ends of the casing. High-pressure steam enters from the steam inlet, acts on the rotation of the helical rotor, and then discharges from the steam outlet, converting the medium pressure into power output. [0003] The mechanical seal is the key component and the only wearing part of the screw power machine. Its quality directly affects the service life and ...

AI Technical Summary

Problems solved by technology

[0004] The main sealing side of the above-mentioned prior art mechanical seal device, that is, the friction pair formed by the moving ring 1 and the bellows compensating static ring 2 on the left side, is to seal the high-pressure and high-temperature steam medium in the body, and the steam pressure at the front end of the main seal Large, the gas-liquid two-phase is difficult to form a stable liquid film on the friction end surface, so the lubricity is not good, the friction force of the end surface is large, and the medium contains high-temperature steam, which makes the end surface lubricity worse, and the bellows needs to withstand greater pressure than ordinary liquid media. The torque, and the frequent start-up of the equipment makes the mechanical seal bear a large torque, which is easy to cause the bellows 21 to be fatigued and twisted.

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