Design And Research Of Test Temperature Box Based On Special Test Environment Of Analog Electronic Device

In recent years,the use of test thermostats has developed rapidly and matured gradually with the development of science and technology.However,due to the complexity and particularity of the application environment of some analog electronic devices,the ordinary test thermostat can not meet the performance test of its electronic devices.In this paper,in view of the shortcomings of the current tester's poor universality,and in order to meet the test requirements of electronic devices under high voltage operation,the design and research of the test thermostat is carried out.Firstly,in order to avoid the safety accident caused by leakage and high voltage breakdown,the ultra-high insulation high voltage output connection block is designed and assembled to seal and insulate the connection socket of the wire;On this basis,the mechanical structure of the shape of the test thermostat was designed to meet the needs of the work.Secondly,in order to ensure that the temperature field and flow field characteristics of the space in the test thermostat meet the design requirements,the mechanical structure of the test thermostat is optimized.And through calculation,the relationship between the cooling and heating load of the test oven and the temperature is obtained.The mathematical model of the test thermostat is established,and its fluid dynamics(CFD)model is established according to the mathematical model.Through the simulation analysis of the CFD model,the optimal structure of the test thermostat and the best air supply scheme were determined;Finally,the production of the real thing and the construction of the experimental platform were carried out.The rationality of the mechanical structure design of the test thermostat and the correctness of the simulation are verified by experiments.Through the comparison and analysis of simulation and experiment,it is concluded that:in the steady state working condition of the test thermostat,both the simulation results and the experimental results show that the mechanical structure is the optimal mechanical structure when the fillet radius is 100mm;Under this structure,the flow of air is not only smooth but also convective heat transfer is sufficient.It shows that the temperature field uniformity and flow field stability of the test thermostat system are guaranteed in terms of structure;At the same time,it shows that the air supply scheme is the best air supply scheme when the air supply speed is 1.8m/s.Under this air supply scheme,the convection degree in the test incubator is sufficient,the temperature difference is the smallest,the temperature difference is the smallest,the pressure fluctuation and the extreme value meet the design requirements;In the case of continuous change of working temperature in the test thermostat,the simulation results show that the heating rate and cooling rate of the test chamber under the optimal air supply scheme are 3~oC/min and 2~oC/min,respectively;The experimental results show that under the same air supply scheme,the error between the temperature rise and temperature drop function curves obtained by the experiment and the corresponding theoretical curve are within 2~oC.It shows that the design of the test thermostat meets its temperature uniformity and flow field stability.