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Beijing Pusanda Instrument Technology Co., Ltd
Comprehensively analyze the working principle and structure of the temperature shock test chamber
Date: 2025-12-15Read: 0
The temperature shock test chamber is an environmental testing equipment used to simulate the rapid high and low temperature changes experienced by products in a short period of time. It is mainly used to assess the reliability of products in terms of thermal expansion and contraction, material fatigue, and weld cracking. It plays a key role in fields such as electronics, aviation, automotive, and military industry that require high adaptability to product environments.
1、 Working principle
Temperature shock test chamberThe core principle is to utilize the rapid transfer between high and low temperature zones, enabling the tested sample to undergo a temperature "shock" in a very short period of time, thereby triggering potential failure modes. There are two common implementation methods:
Two Chambers: One chamber maintains high temperature and the other maintains low temperature. The sample is quickly moved between the two chambers by pneumatic or mechanical mechanisms to achieve temperature switching, which usually takes a few seconds to a dozen seconds.
Three Chambers: Adding a room temperature transition zone on the basis of the conventional high and low temperature two chambers, the sample first stays in the transition zone and is then sent into the target temperature zone by the robotic arm. This structure can reduce airflow interference, improve temperature stability, and is suitable for experiments that require warmer or more complex impact processes.
Regardless of the structure, there is a cold/heat storage system inside the equipment (usually using a compressor and heating tube combined with phase change materials or heat exchangers) to ensure stable temperature in the high and low temperature zones and quickly achieve thermal equilibrium after the sample is transferred.
2、 Main structural components
High and low temperature storage box: an independent sealed chamber that maintains a set high temperature (such as+150 ℃) and low temperature (such as -65 ℃) environment, with stainless steel or corrosion-resistant materials lining to ensure uniform temperature.
Sample transfer mechanism: driven by cylinders, servo motors, or linear modules, ensuring high speed, precise positioning, and reducing temperature leakage during the transfer process.
Refrigeration and heating system: The compressor, condenser, and evaporator form a refrigeration circuit, which is combined with electric heating tubes to achieve bidirectional temperature control; Advanced models use variable frequency compressors to improve energy efficiency and temperature control accuracy.
Control system: A controller based on PLC or embedded microprocessor, which can achieve programmed control of parameters such as temperature setting, impact frequency, dwell time, and conversion interval, and has over temperature, leakage, and compressor overload protection.
Air duct and diversion design: Ensure uniform temperature field inside the box and avoid local hot or cold spots affecting the test results.
3、 Key technical indicators
Temperature conversion rate: It reflects the impact strength and generally completes the switching from high to low or low to high in a few tens of seconds.
Temperature range and uniformity: Common range -70 ℃~+200 ℃, uniformity can reach ± 2 ℃.
Residence time control accuracy: can be precise to the second level, ensuring the reproducibility of the experiment.
4、 Practical application and operational suggestions
In terms of chips PCB、 In the reliability testing of welding points and structural components, setting different high and low temperature extremes and residence times can accelerate the exposure of potential defects. During operation, it is important to ensure that the sample is securely fixed to avoid displacement during the transfer process; Before the experiment, a no-load test run should be conducted to confirm that the conversion time and temperature meet the standards; Regularly clean the air duct and check the refrigerant dosage to maintain stable performance.
5、 Summary
Temperature shock test chamberRealize thermal shock simulation of products through high and low temperature zoning storage and rapid transfer. Understanding its working principle and structure is helpful for rational selection, correct use, and fully leveraging its role in reliability verification, providing strong data support for product development and quality control.