Method for calculating thermal-state variable quantity of screw rotor inter-tooth gap

Abstract

The invention discloses a method for calculating the thermal-state variable quantity of a screw rotor inter-tooth gap. The method comprises the following steps of: receiving initial coordinate data of a plurality of points forming cold-state end face molded lines of a female rotor and a male rotor and a given temperature working condition; calculating coordinate data of the plurality of points forming cold-state end face molded lines of the female rotor and the male rotor under a given temperature working condition; obtaining the difference between the coordinate data under the given temperature working condition and the initial coordinate data to obtain the thermal deformation amount of the points on the end face; separately calculating the thermal deformation amount of each point in the normal vector direction of the tooth surface of the rotor according to the thermal deformation amount of each point on the cold-state end surface molded lines of the female rotor and the male rotor on the end surface; and adding the thermal deformation amounts of the corresponding points on the cold-state end face molded lines of the female rotor and the male rotor in the normal vector direction of the tooth surface to obtain the thermal-state variable quantity of the screw rotor inter-tooth gap. According to given temperature working condition parameters and the cold-state end face molded line of the rotor, calculation of the thermal-state variable quantity of the screw rotor inter-tooth gap can be rapidly completed.

Description

technical field [0001] The present invention relates to screw compressor technology. Background technique [0002] The screw compressor is a positive displacement compressor, which forms a closed volume between the yin and yang rotors and the casing, and the gas is compressed as the closed volume is continuously reduced during the rotation process. The high efficiency of the screw compressor is mainly ensured by the precise meshing between the rotors. However, when the operating temperature is quite different from the standard design temperature, the thermal deformation causes the rotor profile to change, which leads to the change of the rotor inter-tooth clearance. The leakage increases in large places, and failures such as rotor seizure and rubbing of cylinders are prone to occur in places with small gaps, resulting in a significant reduction in the operating efficiency and reliability of the main engine. [0003] At present, there are two main methods to solve the proble...

AI Technical Summary

Problems solved by technology

The disadvantage is that it puts forward higher requirements on the design ability and processing ability of the rotor.

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