High-low temperature experiment box

Abstract

The invention discloses a high-low temperature experiment box which comprises a thermal insulation closed box body, a temperature control system and a circulating fan arranged outside the box body. The circulating fan comprises a motor and a driving shaft, wherein the motor is arranged on the outer side of the box body through a motor base, and the driving shaft is rotatably connected to the wallof the box body through a bearing. One end of the driving shaft is coaxially and fixedly connected with an output shaft of the motor, the other end of the driving shaft is connected with a fan shaft in the wall of the box body, and the fan shaft is rotatably connected to the wall of the box body through a bearing. The other end of the fan shaft is connected with a plurality of fan blades, the fanblades and part of the fan shaft are positioned in a temperature change area in the box body, the lower end of the driving shaft and the upper end of the fan shaft are provided with a circular ring section, the upper end of the fan shaft sleeves the lower end of the driving shaft, the inner wall of the driving shaft is connected with the outer wall of the fan shaft through at least three springs,and horizontal I-shaped connecting keys inserted into the wall of the driving shaft and the wall of the fan shaft are connected into the springs in an inserted manner. All parts are protected, and theservice life of the circulating fan is prolonged.

Description

technical field [0001] The present disclosure generally relates to a test device, in particular to a high and low temperature test box. Background technique [0002] In the design and manufacture of some important parts or finished products, in order to understand the working performance of the product in extreme environments, high temperature to low temperature tests are usually carried out on the products to test the reliability of the products in extreme environments. [0003] In order to ensure the uniform temperature of the test chamber, the circulation fan is an essential and important part. Because the temperature of the test chamber often changes greatly, and the temperature change can be between -100 and +200 degrees, so the mechanical structure of the fan is also subject to the test of this large temperature, especially the moving parts that have a cooperative relationship. Such as the coordination of the shaft, bearing seat and bearing in the structure of the cir...

AI Technical Summary

Problems solved by technology

Therefore, when the temperature is too low, the gap between the mating shaft and the bearing will increase, and when the temperature is too high, it will cause excessive fit interference and cause bearing damage

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