Natural convection constant temperature box

With the gradual improvement of global technological level, intelligent electronic devices have become increasingly closely related to people's lives, such as smart wearables, smart cars, 5G communication base stations and terminals, which are quietly changing people's way of life. The above-mentioned electronics are integrated with a large number of chips, generate a large amount of heat, and most of them work in natural high-temperature environments without wind. It is crucial to evaluate, test, and verify the reliability of the device's own heat dissipation and the safety of the user's temperature. Therefore, developing a detection temperature box device that can simulate a real natural heat dissipation environment is of great significance for the development of natural heat dissipation electronic products.

The windless natural convection constant temperature test chamber can simulate the actual indoor ambient temperature. Through natural convection testing equipment and software, a constant temperature environment (natural convection) can be generated without the need for forced air circulation by a fan, and integrated testing of temperature detection related to the test sample can be carried out. The natural convection oven can simulate free air conditions well without forced air circulation test conditions.

Through rigorous simulation calculations, a test chamber is composed of high transmittance acrylic with openings. The air pressure inside and outside the chamber is interconnected, ensuring that air naturally enters the chamber with an airflow velocity of less than 0.2m/s. The outer wall of the high transmittance acrylic weakens the heat radiation exchange between the tested equipment and the test chamber, meeting the requirements of natural heat dissipation. The temperature inside the test chamber is controlled to the set temperature value through the detection feedback of thermocouples and PID temperature control heating tubes. The amount of external supplementary gas used at different temperatures is achieved through an automatic gas adjustment device. Multiple flexible installation methods such as direct placement, holding poles, and hanging racks of the tested equipment are realized through an installation platform; Flexible expansion of cavity space is achieved through modular structural design.

1. Temperature range: ambient temperature+3 ℃~70 ℃, maximum temperature rise of 45 ℃, maximum temperature ≤ 70 ℃

2. Inner box size: W860 × D860 × H1160

3. Outer box size: W918 × D914 × H1600

4. Quality standard: A 9-point temperature measurement report is attached at the factory. The standard deviation between the measured temperature at each point and the average temperature at 9 points is less than 2 ℃. (Specify test temperature points as 40 ℃, 50 ℃, 60 ℃, and 70 ℃)

5. Point average temperature: After the temperature of the test chamber is balanced, samples are taken continuously for 10 minutes at each of the designated 9 temperature points at a frequency of 10 seconds, as the point average temperature.

6. Set average temperature:

Take the average temperature of the average temperature at 9 locations as the set average temperature for that temperature.

1. Test box material: 20mm organic glass material

2. Door: W834 * H1179

3. Lifting platform: 380 * 230, effective lifting height 370mm, load-bearing capacity 250kg

4. Heating device: using silicon carbide heater, equipped with reflector, isolation and equalization net, and insulated convection orifice plate.

5. Control method: The box is divided into two zones, each zone independently controls the temperature, and each zone has a temperature sensor, a set of temperature controllers, and a heater. Ensure the uniformity of the temperature field throughout the entire test chamber.

6. Lead hole: Lead holes on both sides, with a diameter of 100mm

7. Safety protection measures: over temperature protection, over-current protection, leakage protection

8. Power supply: AC220V/50Hz, 20A