Variable-line double-screw rotor and design method thereof

Abstract

The invention discloses a variable-line double-screw rotor and design method thereof. A rotor structure comprises a female screw rotor and a male screw rotor with the outer contours of conical structures, guide spiral lines of the female screw rotor and the male screw rotor both adopt a variable pitch mode, the guide spiral lines are divided into two parts, when the rotor rotation angle is smaller than a set value, a larger rotor pitch is adopted, when the rotor rotation angle is larger than the set value, and a smaller rotor screw pitch is adopted, so that axial exhaust ports of the rotors are enlarged, along with the increase of the axial distance of the rotors, the tooth crest radius of the female screw rotor and male screw rotor is linearly reduced to form taper angles of the female screw rotor and male screw rotor, and the volume of the working cavity of the double-screw rotors is reduced along with the opening corner of an exhaust orifice, so that the opening corner of the exhaust orifice is opened in advance under the same internal volume ratio, and the area of the exhaust orifice is increased. According to the variable-line double-screw rotor and design method thereof, the area of the exhaust orifice of a screw compressor is effectively enlarged, resistance loss at the exhaust position is reduced, pressure pulsation of the exhaust side is reduced, and therefore the effects of improving the efficiency of the screw rotors and reducing noise are achieved.

Description

technical field [0001] The invention belongs to the field of twin-screw compressor rotor processing, and in particular relates to a modified line twin-screw rotor and a design method thereof. Background technique [0002] Twin-screw compressor is a volumetric rotary compressor used to obtain low-to-medium pressure gas, and has a wide range of applications in modern industry. It inherits many advantages such as long service life, reliable operation, small vibration, low noise, stable operation and no surge phenomenon of rotary machinery. At the same time, it has the characteristics of no wearing parts such as air valves, forced suction and exhaust, and simple processing. Central components in systems such as supply, cooling and waste heat recovery. The conventional twin-screw compressor rotor adopts an equal-pitch rotor structure, resulting in no volume change during the transportation of the gas, and the internal compression process is only performed when the volume cavity ...

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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