A semi-hermetic screw compressor with adjustable internal volume ratio

Abstract

The invention relates to the field of mechanical equipment, in particular to a semi-enclosed screw compressor with the adjustable interior volume ratio. The screw compressor moves downwards along a cylinder body through an adjusting piston Vi and pushes a slide valve Vi to move in the horizontal direction, and then the interior volume ratio of the screw compressor can be adjusted. Through a protruding part, a sunken part and a spring with one end connected to the protruding part and the other end connected to the bottom of the sunken part, the adjusting piston Vi can do reciprocating motion, and then the under-compression state and the over-compression state of the screw compressor can be adjusted. The top end of the cylinder body extends out of a shell, and therefore the interior volume ratio of the screw compressor can be adjusted from the exterior of equipment, and the operation is convenient. The screw compressor lowers the energy consumption, improves the energy efficiency and is especially suitable for being applied to systems with the air suction pressure level and the air exhaust pressure level changed in real time.

Description

technical field [0001] The invention relates to the field of mechanical equipment, in particular to a semi-hermetic screw compressor with adjustable inner volume ratio. Background technique [0002] Air-conditioning and refrigeration systems often have different pressure ratios under different working conditions due to the uncertainty of refrigerant temperature and pressure characteristics and customer operating conditions. Therefore, compressors with fixed pressure ratios often have undercompression and Over-compression, under-compression and over-compression processes will cause problems such as waste of power consumption and increased vibration and noise. [0003] The screw compressor inhales gas through the rotation of the rotor, and the gas accumulates between the rotor and the casing, is compressed as the male and female rotors mesh, and is finally discharged as the meshing process ends. This stage is the internal compression stage. The volume ratio in the traditiona...

AI Technical Summary

Problems solved by technology

If these values ​​do not match, undercompression and overcompression will result in inefficient compression

[0004] For a screw compressor with a fixed-size exhaust port, the high-pressure gas in the screw rotor chamber will start to exhaust when it reaches the exhaust port as the screw rotors mesh with each other. When the system operating conditions change, the exhaust The pressure (back pressure) in the cavity changes accordingly, and the pressure of the high-pressure gas in the screw rotor cavity is almost constant when the exhaust port is opened. At this time, the compressor is prone to overcompression or undercompression, resulting in compression The input power consumption of the machine increases, the noise and vibration increase, and in severe cases, it even affects the normal operation of the compressor

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