A modified line twin-screw rotor and its design method

Abstract

A modified-line twin-screw rotor and a design method thereof. The rotor structure includes a male-female screw rotor whose outer contours are both conical structures. The guide helix of the male-female screw rotor adopts a variable pitch method, and the guide helix is ​​divided into two parts. When the rotation angle is less than the set value, a larger rotor pitch is used. When the rotor rotation angle is greater than the set value, a smaller rotor pitch is used to realize the increase of the rotor axial exhaust port; with the increase of the rotor axial distance , the tooth tip radius of the yin and yang screw rotors decreases linearly, forming the conical angle of the yin and yang screw rotors; the volume of the working chamber of the twin-screw rotor decreases with the opening angle of the exhaust orifice, so as to realize that under the same internal volume ratio, the opening angle of the exhaust orifice decreases. Open earlier to increase the area of ​​the exhaust port. The invention realizes the effective expansion of the exhaust port area of ​​the screw compressor, which is beneficial to reduce the resistance loss at the exhaust and reduce the pressure pulsation at the exhaust side, thereby achieving the effects of improving the efficiency of the screw rotor and reducing the noise.

Description

technical field [0001] The invention belongs to the field of rotor processing of twin-screw compressors, and particularly relates to a modified-line twin-screw rotor and a design method thereof. Background technique [0002] The twin-screw compressor is a positive displacement rotary compressor, which is used to obtain medium and low pressure gas, and has a wide range of applications in modern industry. It inherits many advantages such as long service life of rotary machinery, reliable operation, low vibration, low noise, stable operation and no surge phenomenon. Core components in systems such as supply, refrigeration and waste heat recovery. The conventional twin-screw compressor rotor adopts an equal-pitch rotor structure, resulting in no volume change of the gas during transportation, and the internal compression process only occurs when the volume cavity reaches the exhaust end face, which results in a large volume ratio. The area is smaller, which increases the exhau...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a modified twin-screw rotor and its design method for the problems of insufficient rotor efficiency and relatively high operating noise in the prior art, so as to effectively expand the area of ​​the exhaust port and effectively It is beneficial to reduce the resistance loss at the exhaust, reduce the pressure pulsation on the exhaust side, and realize the effect of improving the efficiency of the screw rotor and reducing noise

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