Abstract
A new design method based on pixel solution is proposed to achieve an efficient and high-precision design of a twin-screw rotor profile. This method avoids the complex analytic calculations in the traditional envelope principle. The best approximation of the pixels of the rotor conjugate motion sweeping surface in the lattice screen pixels is illuminated using a specific color. The sweeping surface of the screw rotor single-tooth profile is roughly scanned to capture the base point set of the sweeping surface boundary pixels. The chord length and tilt angle of each interval are calculated using the value of the base point set to adjust the position, phase, and magnification of each interval sweeping surface. Each interval sweeping surface is finely scanned to capture the data point set of the subinterval, and then the data point set is converted to the same coordinate system to generate the conjugated rotor profile. Finally, an example is used to verify the feasibility and adaptability of this method. The approach provided can be used to design screw rotor profiles with high precision.
Highlights
Twin-screw compressors have the advantages of reliable operation, long service life, compact structure, and high energy efficiency and are, widely used in automotive, compression, and refrigeration, among other industrial fields
A pair of meshing screw rotors forms the key component of the twin-screw compressor, and the rotor profile is the main factor determining the performance of the compressor. erefore, the methodology used to design a precision screw rotor profile efficiently is important
With the improvements in the technological level and calculation conditions, many representative rotor profiles and their design methods have been developed in recent years
Summary
Twin-screw compressors have the advantages of reliable operation, long service life, compact structure, and high energy efficiency and are, widely used in automotive, compression, and refrigeration, among other industrial fields. Litvin and Fuentes [1] derived an analytical calculation process of the forming tool profile for machining gears, which could be used to design screw rotors. Owing to the complexity of the equation of the contact line, the computing process of the equation led to the formation of a singular point and an uneven distribution of the generated profile data. E point vector envelope method was proposed to calculate the forming tool profile of the spiral surface by He et al [7]. To generate the conjugate rotor profile, a new method of designing a screw rotor profile, based on pixel solution, has been proposed in this study. E results show that the pixel solution avoids the singular point and uneven distribution of profile data seen in the analytic gearing envelope method. E deviation between the two methods was found to be within −0.002 mm to 0.002 mm
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