A semi-hermetic single-unit two-stage screw compressor

Abstract

The invention relates to a semi-closed single-machine double-stage screw compressor. The semi-closed single-machine double-stage screw compressor comprises a shell, a control system, first rotors, a coupling and second rotors, wherein the control system, the first rotors, the coupling and the second rotors are arranged in the shell; an air inlet is formed in one end of the shell, an air outlet is formed in the other end of the shell, the first rotors, the coupling and the second rotors are sequentially arranged along the direction from the air inlet to the air outlet; the first rotors comprise a first female rotor and a first male rotor meshed with the first female rotor, the second rotors comprise a second female motor and a second male rotor meshed with the second female motor, and the first male rotor and the second male rotor are connected through the coupling; the control system is electrically connected with the first rotors and drives the first rotors to rotate. The semi-closed single-machine double-stage screw compressor has the advantages of high compression efficiency, accuracy in energy regulation, and the like.

Description

technical field [0001] The invention relates to refrigeration compression equipment, in particular to a semi-closed single-unit two-stage screw compressor. Background technique [0002] The screw compressor is a rotary compressor that uses the screw-shaped rotor to perform rotary motion in the cylinder to compress and deliver gas. The core component of the screw compressor is the compressor host, which is a type of positive displacement compressor. The compression of air is achieved by the volume change of the tooth slots of the male and female rotors that are installed in the casing and meshed with each other in parallel. Its precisely matched casing rotates so that the gas between the rotor tooth slots continuously produces periodic volume changes and is pushed from the suction side to the discharge side along the rotor axis to complete the three working processes of suction, compression and exhaust. Existing screw compressors include open-type single-unit two-stage screw...

AI Technical Summary

Problems solved by technology

When the motor and compressor adopt the open type, there are high requirements for the sealing of the screw compressor, and the use of the coupling will also reduce the transmission efficiency of the motor, and at the same time, the operating noise is relatively large

[0006] When most screw refrigeration compressors use ammonia as the refrigerant, they have a fixed speed and do not adjust the energy through variable speed. In the large screw refrigeration compressors for ammonia, the energy slide valve adjustment mechanism is generally used for energy adjustment, but the slide valve The adjustment range is generally above 10%, and in the process of adjusting the energy change, the change of the motor power is not proportional to the change of the load, which makes the efficiency of the motor low at low load, thereby reducing the cooling efficiency of the system

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