The heat aging test chamber is the main equipment for testing rubber materials. However, if the temperature averaging exceeds the allowable deviation range during the environmental test, the data obtained from the test is unreliable and the test data cannot be Tolerance to environmental testing as a material or product. So what are the reasons why the temperature uniformity exceeds the tolerance range?
1. Since the heat transfer coefficient of the front and rear of the box wall of the studio is different, some of the threading holes, detection holes, test holes, etc. cause local heat dissipation and heat transfer, so that the temperature of the box is not uniform, so that the box Wall convection heat transfer is not uniform, affecting the uniform temperature field.
2. The design problem causes the heat aging test chamber to be difficult to achieve a uniform symmetrical structure in the internal structure and space design, and the asymmetrical structure will inevitably lead to deviation of the internal temperature uniformity.
3. Arrangement of test object space in the working room: If a test sample sufficient to affect the internal thermal convection is placed in the working chamber, the uniformity of the internal temperature, that is, the temperature uniformity, will inevitably be affected to some extent.
4. If the volume of the test object is too large, or the position or mode of the test object placed in the working chamber of the heat aging test chamber is not suitable, the air convection inside is blocked, and a large deviation of temperature uniformity is also generated.
5. Due to the different structure of the inner wall of the test box, the temperature of the inner wall of the test box will be uneven, which will affect the thermal convection in the working chamber, resulting in deviation of the internal temperature uniformity.
6. The sealing of the cabinet and the door is not strict. For example, the sealing strip is not customized with joints, the door is leaking, etc., which affects the uniformity of the temperature field in the working space.
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