Talking about the Data Analysis of the Refrigeration Tube of Air Compressor

After more than 40 years of development, the finite element method has been quite rich in form and the theory is quite perfect. Based on modern mechanics, computer simulation as a means, optimization for the purpose, finite element analysis as the core of CAE modern engineering technology has been rapidly developed, in the development of new products, it not only reduces product development costs, improve products The reliability of the design, and the use of computer simulation technology, the use of physical models and mathematical models instead of the actual system for experiments and research, in the new product design stage can achieve its performance prediction, thereby greatly shortening the product development cycle . At present, advanced CAE general and dedicated finite element analysis software includes NASTRAN, ANSYS, MSCMARC, ABAQUS and ALGOR.

Problem Description The final stage cooler of 40MPa high-pressure air compressor is a shell-and-tube structure, with a gas-passing pipe and a water-passing shell. The cooling tube is made of BFe30-1-1 copper tube with the specification of <16×415. The inner wall temperature of the cooling tube is 130°C, and the outer wall temperature of the cooling tube is 80°C. The design pressure of the cooling pipe is 40 MPa (G), and the hydraulic strength test pressure is 60 MPa (G). The elastic modulus E of the copper tube material is 11471×105MPa, the Poisson's ratio of the material is 01286, the thermal conductivity of the material is 010294W/(mm°C), the thermal expansion coefficient is -1612×10-61/°C, and the reference temperature is 20. °C. The problem is to use the finite element analysis method to check the strength of the high pressure cooling tube from different conditions such as temperature load, working load and temperature and working load coupling.

The establishment of the finite element model The establishment of the finite element model of the high-pressure cooling pipe requires the completion of the following main contents: setting the working directory, specifying the job name and analyzing the thermal stress analysis of the title high-pressure cooling pipe; defining the graphical interface filtering parameters, selecting the thermodynamics (Thermal), and completing The specification of the analysis category; in terms of unit selection, as long as the unit for inputting all data is the unit of the same unit system currently used; the unit type is defined, and the 6-node triangle 2D entity in the entity (Solid) is selected. Unit, Plane35 unit, set option (Plane35 unit Options) K3 is the plane problem (Plane); define the material's heat transfer coefficient KXX=010294; establish the cooling tube cross-section geometry model, where the outer radius 8, the inner radius 315, and MeshTool is used for meshing, in which the unit side length is set to 014. The high pressure cooling tube finite element model is shown.

Structural stress analysis when the cooling pipe is only subjected to internal pressure In order to facilitate the analysis of the influence of the gas force and the temperature difference load on the cooling pipe, the following is a list of the stress distribution diagram when the cooling pipe is only subjected to the gas force, and the analysis result of the highest working pressure state is as follows. The results of the 60MPa hydraulic strength test state analysis are shown as 0 and 0.

At present, various general-purpose and special-purpose finite element analysis softwares provide engineers and technicians with a friendly operation platform with their unique functions. The entire analysis process of finite element method, such as structural discretization, unit analysis, and overall analysis, etc. Included in the analysis software, the operator can easily obtain the desired results as long as the operator successfully completes the key processes of modeling and loading of the analysis problem. In the force analysis of complex structures, especially in the various dynamic response analysis of structures, the application of finite element analysis software is more convenient.

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