A steam supply equalizing device for shaft end seal of steam turbine

Abstract

The invention relates to a steam supply equalizing device for sealing the shaft end of a steam turbine, comprising: a shaft seal body chamber of a low-pressure cylinder, a rotor of the low-pressure cylinder, a steam seal block and a central control module. The present invention sets the central control module so that the central control module can select the corresponding steam flow according to the load and back pressure of the unit, which can effectively prevent the air pressure in the shaft seal chamber of the low-pressure cylinder caused by too high steam flow when the low load and back pressure are selected. If the temperature is too high, the steam leakage in the chamber of the shaft seal body of the low-pressure cylinder will occur, which effectively improves the steam seal efficiency of the device. At the same time, a steam return chamber is also provided in the shaft seal body chamber of the low-pressure cylinder, and by setting a steam return valve at the port of the steam return chamber and adjusting the opening of the steam return valve, the pressure in the shaft seal body chamber of the low-pressure cylinder can be effectively adjusted. The total amount of steam, thereby completing the efficient adjustment of the air pressure in the chamber of the shaft seal body of the low-pressure cylinder, further improving the steam seal efficiency of the device.

Description

technical field [0001] The invention relates to the technical field of steam turbine seals, in particular to a steam supply equalizing device used for sealing the shaft end of a steam turbine. Background technique [0002] A steam turbine is a rotating power machine powered by steam and converts the thermal energy of steam into mechanical work. It is the most widely used prime mover in modern thermal power plants. Since the main shaft of the steam turbine must pass through the cylinder, there must be a certain radial gap between the main shaft and the cylinder, and the steam pressure in the cylinder is not equal to the external atmospheric pressure, which will inevitably cause the high-pressure steam in the steam turbine to pass through the gap. Leakage will cause the loss of working fluid, worsen the operating environment, and may heat the journal or rush into the bearing to deteriorate the quality of the lubricating oil; or the outside air will leak into the low-pressure e...

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Problems solved by technology

[0006] For this reason, the present invention provides a steam supply equalizing device for the shaft end seal of a steam turbine to overcome the low efficiency of the steam seal caused by the inability to flexibly adjust the steam flow and steam distribution in response to changes in load and back pressure in the prior art The problem

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