The traditional screw compressor design method has seriously affected the delivery time and performance level of new products and weakened its market competitiveness. With the universal application of computers, the famous screw compressor companies in foreign countries have adopted the computer-aided design and calculation system of various screw compressors in product design and research. After more than ten years of unremitting efforts, the Compressor Teaching and Research Section of Xi'an Jiaotong University has solved the rotor profile design, accurate calculation of geometric characteristics, tool edge calculation, thermal performance and dynamic characteristics prediction, suction and exhaust orifice configuration, and rotor force and Key technologies such as deformation calculation, developed a set of DOS version screw compressor design and calculation system SCCAD with independent copyright. Using this software, successfully cooperated with relevant units to develop various types of screw air compressors and new refrigerator products. There are also several screw compressor manufacturers at home and abroad who have purchased the software and achieved good economic and social benefits. Since its inception, Microsoft Windows has been updated and improved, with its full-featured, easy-to-use, novel and beautiful user interface, and other revolutionary changes in the computer operating system and software development process, the development of applications that follow the Windows standard The more attention it receives from users in various countries. In order to meet this requirement, the author used Visual Ba2 sic, a visual, object-oriented, event-driven structured programming language to develop and improve Windows-based software based on the previous DOS version of the screw compressor design calculation software SCCAD210. The screw compressor design calculation software SCCAD310. This software establishes a friendly user interface for various conventional design calculations of the screw compressor, which makes the computer-aided design of the screw compressor easier and more convenient. 2 user interface composition and its implementation The user interface of the software mainly includes the main components of the display startup screen, screw compressor design calculation window, input data and design result report, calculation result graphic display, and compressor working process animation simulation. Each component uses object-oriented programming ideas to encapsulate the calculation program and data as an object, with their own windows, to complete a certain function of the screw compressor design calculation, to form a multi-document interface (MDI) program. 21 shows the startup screen The startup screen is displayed with a splash screen displayed during the loader interval and a nice image appears in the center of the screen. In order to display the theme characteristics of the screw compressor design calculation, the display startup screen uses Photoshop software to create the background, and uses the VB language Timer control to realize the animation process of the rotor logo. 22 screw compressor design calculation window The design and calculation window of the screw compressor mainly completes the rotor profile generation, geometric characteristic value calculation, working process calculation simulation and performance prediction, rotor force deformation calculation and rotor tool edge shape calculation design of the screw compressor. This part adopts the menu-like structure for convenient operation, and it is convenient to input and modify the data. The SHELL statement is used to complete the link between the user interface and the calculation program, and the whole design calculation process is continuous. (1) Rotor type line generation conjugate type line generation program provides a database of some common type lines. After the user selects the type of profile line to be used, it is easy to calculate the rotor with given diameter, number of teeth combination and various profile parameters. End profile line data. (2) Geometric property value calculation The geometric property value calculation is based on the calculation of the profile line, taking into account the rotor structural parameters and the orifice parameters, further calculating such as contact line length, leakage triangle, area utilization factor, suction and exhaust orifice area and primitive The law of change in volume. (3) Work process calculation simulation The calculation of the working process is based on the calculation of the geometric property values, the detailed analysis of the inhalation, compression and exhaust processes, the establishment of the corresponding partial differential equations, the use of computer numerical solution to determine the microscopic performance parameters such as pressure and temperature. And macro performance parameters such as displacement and shaft power. This part of the program is applicable to both refrigeration compressors using R22, R12, R134a and ammonia as media, as well as gas compressors using air and natural gas as medium. (4) Calculating the force of the rotor The calculation of the force of the rotor is based on the calculation and calculation of the working process, and the bearing force of the rotor and the bearing load of the supporting rotor are calculated. (5) Calculation of rotor deformation The calculation of rotor deformation is based on the analysis of the force of the rotor to calculate the deformation of the yin and yang rotor. (6) Tool edge shape calculation Tool edge shape calculation Using the coordinate points of the end face type line and the rotor structure parameters, the blade shape data of the disc milling cutter or the forming grinding wheel is calculated. 23 input data and calculation results display The input data and calculation result display window mainly displays the input data and calculation results of the rotor profile, geometric characteristics, thermal characteristics, rotor force, rotor deformation and tool edge shape. This window uses the RichTextBox control to copy, save, and print input and output data. The RichTextBox control allows you to enter and edit text, allowing you to change fonts, colors, and set paragraph styles. Therefore, the copying, saving and printing operations of the input and output data are more convenient, so as to achieve timely and accurate storage of the calculation results. 24 calculation results graphic display The software uses the PictureBox control to realize the graphical display of the calculation results of the rotor profile, meshing line, leaking triangle, suction port, exhaust port, P-V diagram, rotor force, rotor deformation and tool edge shape. The PictureBox control can display graphics from bitmaps, icons or meta-files, as well as graphics from enhanced metafiles, JPEG or GIF files. The PictureBox control makes it easy to copy and print graphics, and the software allows text editing of graphics. The change of the shape of the graphic line, the change of the color and the partial enlargement of the graphic, so that some incomprehensible spatial relationships in the screw compressor such as the contact line, the meshing line, the leakage triangle, the suction and exhaust port are more intuitive and visual. Animated simulation of the working process of 25 screw compressor In order to visually display the rotor meshing process of the screw compressor, the software uses 3DMAK software to realize the animation simulation of the suction and exhaust working process of the screw compressor, as shown in 1. The animated simulation visually shows the process of increasing pressure during compression and allows the rotor to be adjusted to make the simulation more realistic. 3 Conclusion The Windows operating system quickly replaced the DOS operating system with its user-friendly interface and powerful functions, becoming the mainstream product of today's operating systems. Therefore, following the Windows standard is the development direction of application development. The development of Chinese and English versions of screw compressor design and calculation software based on Windows provides a convenient, fast and accurate computer aided design tool for the development of screw compressors.
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