The temperature rise test angle for household appliances is based onGB 4706.1 "Safety of household and similar electrical appliances - Part 1: General requirements"A dedicated testing site designed to simulate the actual installation and use environment of household appliances in wall corners, accurately measuring the temperature rise values of various parts during equipment operation. Here are theirSize requirementsandTemperature distribution requirementsDetailed content:
The temperature rise test angle isA right angled space enclosed by three sides, byVertical walls on both sidesandTop horizontal cover plateComposition (some equipment testing requires removing the top cover), core dimensions must strictly match the standard:
Wall dimensions
The height of the vertical wall surface shall not be less than2.0mThe width is not less than1.0mEnsure coverage of the height and width range of various household appliances.
The wall material isWooden board with a thickness of ≥ 20mm(or materials with similar thermal conductivity), with a flat surface and no holes, to avoid heat reflection or loss affecting test accuracy.
spatial dimensions
The vertical walls on both sides are90 ° right angleSplicing, the internal corner gaps need to be sealed to prevent airflow from interfering with the temperature field.
The bottom of the testing corner is the laboratory floor (hard, insulated), and the distance between the electrical placement point and the walls on both sides is150mm±10mmSimulate the usage state of household appliances close to the wall corner.
Top cover plate (optional)
Only used for testing wall mounted and embedded electrical appliances (such as range hoods and ovens), with a cover size of not less than1.0m×1.0mThe thickness is consistent with the wall surface, and the height from the top of the appliance is150mm±10mm.
When testing ordinary floor standing appliances such as washing machines and refrigerators, the top cover plate needs to be removed to keep the space above open.
Temperature measurement adoptsThermocouple thermometer(Accuracy ± 1 ℃), the points should cover the electrical appliancesHeating components, easily accessible components, insulation componentsandEnvironmental reference pointThe specific location of the distribution points is as follows:
Layout of environmental reference points
Outside the testing corner1.0mLocation, distance from the ground1.5mInstall one reference thermocouple at a height to measure the laboratory ambient temperature as the reference value for temperature rise calculation (temperature rise=component temperature - ambient reference temperature).
Within the testing angle, around the electrical appliances100mmArrange 2-3 auxiliary reference points to monitor the uniformity of environmental temperature within the testing angle.
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Layout of key electrical components
General rules for point distribution
The contact between the thermocouple and the surface of the component should be tight, fixed with high-temperature resistant tape to avoid air gaps affecting measurement accuracy.
Thermocouple wires should be kept away from the heat source to prevent measurement errors caused by heating of the wires themselves.
For appliances with complex structures, such as multifunctional food processors, it is necessary to separately place key points in each functional module.
Before testing, the laboratory environment temperature needs to be stabilized at20℃±5℃Control the relative humidity within45%~75%.
Electrical appliances should be placed in their normal operating state and run at rated voltage untilThermal stability stateAfter three consecutive measurements with a temperature change of ≤ 1 ℃ at each measuring point, record the final temperature value.
The temperature rise limit shall comply with the corresponding provisions of GB 4706.1, for example: the temperature rise of motor winding (B-level insulation) ≤ 80K, the temperature rise of easily accessible shell ≤ 35K (the temperature rise of child accessible parts ≤ 25K).