As a core equipment in the field of environmental testing, the thermal shock test chamber simulates extreme temperature fluctuations to verify the reliability of products, and is widely used in industries such as electronics, automotive, aerospace, etc. This article will deeply analyze its application scenarios and maintenance points, helping enterprises extend equipment life and improve testing accuracy.

1、 Core application scenarios of thermal shock test chamber

1. Reliability verification of electronic components

In the field of consumer electronics, motherboards and chips of products such as mobile phones and tablets need to withstand temperature differences between day and night or extreme temperature changes during transportation. The cold and hot shock test chamber can simulate-65℃to+180℃Rapid temperature changes, detecting whether the solder joints of components are cracked and whether the packaging material is deformed, ensuring stable operation of the product in extreme environments. For example, a certain brand of mobile phone uses-40℃to+85℃The cyclic testing successfully reduced the failure rate of outdoor use30%.

2. Environmental adaptability testing of automotive components

Automotive electronic controller（ECU）Sensors and battery packs need to adapt to-40℃The extremely cold winter arrives+70℃The engine compartment is experiencing high temperatures. The test chamber can simulate“Immediately rain after exposure to high temperatures”or“Rapid driving after starting at low temperature”Wait for the scenario to verify the sealing of components, material thermal expansion coefficient, and circuit stability. A new energy vehicle company found through testing that battery packs are-20℃to+60℃In the cycle, the attenuation of connector insertion and extraction force exceeded the standard, and it was verified after subsequent optimization design.

3. Performance evaluation of aerospace materials

Aircraft portholes, satellite solar panels, and other materials need to withstand high altitude and low temperatures (approximately-55℃）The high temperature during re-entry into the atmosphere (approximately)+120℃）. The test chamber adopts a three box design (high temperature chamber, low temperature chamber, testing chamber) to achieve the material's10Complete temperature fluctuations within seconds, test its thermal shock resistance, coating detachment risk, and structural deformation, and provide data support for material selection.

2、 Maintenance points for cold and hot shock test chamber

1. Daily cleaning and dust prevention

Box cleaning: Wipe the inside and outside of the box with a soft cloth every week to avoid dust accumulation and affect heat dissipation. Especially, it is necessary to clean the dust accumulation on the condenser fins to prevent a decrease in cooling efficiency.

Sample residue cleaning: After testing, promptly remove sample debris to prevent corrosive substances from remaining and causing rusting of the inner container.

2. Regular maintenance of key components

Refrigeration system inspection: Check the compressor oil level and refrigerant pressure every quarter. If the oil color turns black or the pressure is abnormal, immediately replace the refrigeration oil and replenish the refrigerant.

Heating element detection: Use an infrared thermometer to detect the surface temperature distribution of the electric heating tube every year. If there is local overheating, it needs to be replaced to avoid causing a fire.

Sensor calibration: Calibrate with a standard temperature source every six monthsPT100Temperature sensor ensures temperature control accuracy within±0.5℃Within.

3. Operating standards and safety protection

Sample placement requirements: The distance between the sample and the box wall should be≥10cmTo avoid obstructing airflow circulation and causing temperature uniformity to exceed the standard.

Emergency stop handling: If there is abnormal noise or alarm during testing, immediately press the emergency stop button, cut off the power, and troubleshoot.

Long term shutdown protection: If the device is idle for more than1Within a month, it is necessary to drain the refrigerant from the refrigeration system and turn off the main power to prevent components from being damaged by moisture.

3、 Typical Fault Cases and Prevention

Due to the lack of regular cleaning of the condenser in a certain laboratory, the refrigeration efficiency decreased, and the low-temperature chamber could not reach the required level during testing-65℃After dismantling, the technicians found that the heat sink was blocked by dust. They replaced the heat sink fan and thoroughly cleaned it to restore its performance. This case serves as a warning:80%The refrigeration failure is caused by poor heat dissipation, and a regular maintenance system needs to be established.

The application of cold and hot shock test chambers runs through the entire product development cycle, and scientific maintenance is the cornerstone to ensure the reliability of test data. Enterprises need to develop maintenance plans based on equipment manuals and train operators in basic troubleshooting skills in order to achieve them“Accurate testing and long-lasting equipment”The dual goal.