A compressor air supply system and a compressor air supply control method

Abstract

The invention provides a compressor air supply system and a compressor air supply control method, the air supply system includes a compressor, a condenser, an economizer, an evaporator, a first air supply circuit and a second air supply circuit, wherein the first One air supply circuit is connected between the output end of the condenser and the intake end of the compressor, and the second air supply circuit is connected between the exhaust end of the compressor and the intake end of the compressor. When the exhaust end of the compressor When the pressure meets the air supply conditions, the second air supply circuit is used to supply air to the compressor from the exhaust of the compressor to ensure the pressure required for the gas bearing to work. When the exhaust pressure of the compressor does not meet the air supply conditions, Supply air to the compressor through the surge tank in the first air supply circuit to ensure the pressure required for the gas bearing to work, thereby providing a stable and reliable air source for the static pressure gas bearing for its work and ensuring the static pressure gas bearing. stable job.

Description

technical field [0001] The invention relates to the technical field of refrigeration and air-conditioning equipment, in particular to a compressor air supply system and a compressor air supply control method. Background technique [0002] Oil-free technology is one of the important development directions of centrifugal refrigeration compressors. Centrifugal refrigeration compressors using gas bearings as supporting structures have the characteristics of oil-free, high speed and good stability. The gas bearings used can be divided into static pressure gas bearings and dynamic pressure gas bearings. Compared with dynamic pressure gas bearings, static pressure gas bearings have a larger bearing capacity and better working performance, but a stable gas source needs to be ensured Supply air to the gas bearing to ensure the stable and reliable operation of the gas bearing. [0003] Usually, the high-pressure gas discharged during the working process of the compressor can be used ...

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Problems solved by technology

[0003] Usually, the high-pressure gas discharged during the working process of the compressor can be used as the gas source, or an external gas source can be used to supply gas to the gas bearing, while the centrifugal refrigeration or heat pump unit works under non-rated load conditions most of the time. Under partial load conditions, the maximum pressure difference of the system will change due to the change of evaporation pressure or condensation pressure under partial load conditions, which will lead to insufficient air supply pressure of the bearing. In addition, in other Under extreme working conditions such as high temperature or low temperature working conditions, the air supply pressure of the system will also change greatly

[0004] Insufficient air supply pressure will reduce the bearing capacity of the gas bearing, which will affect the stability and reliability of the bearing and the machine

Using an external air source increases system complexity and consumes excess energy

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