JIS D0203 standard is one of the authoritative specifications in the field of waterproof testing, providing precise and rigorous guidance for rain testing. This paper will discuss the JIS D0203 rain test chamber.
JIS D0203 is a detailed specification in Japanese industrial standards specifically for product rain testing. For example, for rainfall intensity, the standard requires that under specific test conditions, the rainfall intensity of spray rain should be maintained at 4 to 6 mm per minute, and the diameter of raindrops is about 0.5 to 4.5 mm; The amount of dripping water should be controlled at 1 to 5 drops per square centimeter per minute. It is applicable to a wide range of product categories, including but not limited to various types of electronic equipment, automotive parts, outdoor equipment, etc.
In terms of specific test parameters, taking S1 and S2 tests as examples, the inner diameter of the spray pipe is 16mm, the length is 500mm, the diameter of the spray hole is φ1.2mm, the number is 40, and the spacing of the spray aperture is 12.5mm. The spray flow rate is adjustable between 1.9-3.2L /min, the spray pressure is in the range of 0.1kg/cm2 ~ 3kg/cm2, the rotating shaft of the water supply pipe is 45º to the horizontal line, and the rotating speed of the pendulum tube is 23r/min.
For R1 and R2 tests, the rotation speed of the sample support is 5r/min and adjustable, the water pressure is between 0.1kg/cm2 and 3kg/cm2, the spray flow rate is 24.5-39.2L /min and adjustable, and the nozzle meets the requirements of R1 and R2 in standard Figure 1. The shaft of the water supply pipe is 45º from the horizontal line, and the rotating speed of the shaft of the water supply pipe is 23r/min.
The core principle of the rain test chamber is to simulate the natural rainfall environment through a well-designed system to apply different intensity and form of rain impact to the product under test. The common ways of rain mainly include spraying and dripping rain.
Test method for moisture and water resistance of automotive parts in JIS D0203 standard:
This waterproof test equipment is designed and manufactured according to the four test types of R1, R2, S1 and S2 in JIS D 0203-1994 "Test method for moisture and water resistance of automobile parts"
(1) Precise control technology of rainfall intensity
According to JIS D0203, the precise control of rainfall intensity is key. To achieve this, the rain test chamber is usually equipped with highly sensitive and high-precision flow sensors and precision pressure regulating valves. The pressure regulating valve ensures the accuracy of the rainfall intensity by intelligently adjusting the water pressure according to the preset rainfall intensity requirements. For example, during intense rainfall in the simulation, the water pressure needs to be stable between 0.03 and 0.3 MPa.
(2) Wind speed simulation technology
Considering that in the actual natural environment, wind has a significant impact on the falling trajectory and impact force of rain, JIS D0203 standard requires that the rain test chamber has wind speed simulation function. Through the built-in high-performance fan and precision wind speed regulation device, wind can be generated at different speeds and directions. The adjustment range of wind speed is usually 0 to 18 m/s, with an accuracy of ±0.5 m/s. The accurate simulation of wind speed is helpful to evaluate the waterproof performance of the product in a more real and comprehensive environment, and provide more valuable test data for the practical application of the product.
(3) Internal structure design of the JIS D0203 rain test chamber
The internal structure of the test chamber is very important to ensure the uniformity of the rain and the accuracy of the test. Reasonable sprinkler layout, scientific air duct design and optimized space planning in the chamber are the keys to achieve this goal. For example, the nozzle should be evenly distributed, the spacing error is controlled within ±5 mm, to ensure that the rain can evenly cover the surface of the tested product, reduce the local rain insufficient or excessive situation, so that the uneven degree of rain is controlled within ±5%. In addition, the use of high-quality sealing materials and advanced sealing process can effectively prevent water leakage inside the test chamber, ensure the stability and reliability of the test environment, and thus significantly reduce the test error.
(1) Electronic and electrical industries
In the highly competitive field of electronic and electrical appliances, such as high-end products such as smart phones, tablets, and smart TVS, they must have excellent waterproof performance to resist the erosion of rain and wet environments. JIS D0203 rain test chamber can effectively verify the sealing performance of the product shell and the protection capability of the internal circuit. For example, by simulating a heavy rainfall environment of 5 mm per minute for 30 minutes, it can ensure that the product can still work normally and stably in a wet environment, ensuring its reliability in complex climatic conditions.
(2) The automobile industry
Automotive components, especially key components exposed to the external environment, such as lights, Windows, antennas, etc., face severe waterproof challenges. JIS D0203 rain test chamber helps to improve the waterproof quality of automotive components. For example, the simulated rain test of the car window under the wind speed of 80 kilometers per hour lasted for 1 hour, which can effectively detect the sealing performance of the window, enhance the safety and reliability of the car in bad weather conditions, and reduce the electrical failure and interior damage caused by rain leakage.
(3) Aerospace field
Aerospace equipment operates in extreme environments at high altitudes and faces complex and changeable meteorological conditions, including intense rainfall. JIS D0203 rain test chamber can be used to test the waterproof performance of key components such as aircraft shell, engine components and avionics equipment. For example, the simulation of the rainfall environment at an altitude of 10,000 meters, the temperature is minus 50 degrees Celsius, the rainfall intensity is 8 mm per minute, lasting 60 minutes, can ensure that it is not affected by rain during the flight, to ensure flight safety and the normal operation of equipment.
