Water leakage from a vehicle means that water flows into the vehicle from the outside of the vehicle body through the fit clearance of the vehicle body. The vehicle manufacturer uses a simulated simulated rainfall environment to achieve a rain seal performance test. At present, the domestically produced vehicles generally adopt the GB/T12480-1990 passenger car rainproof sealing test method and the QC/T476-1999 passenger car rainproof sealing limit. The integrated and revised standard is the QC/T476-2007 passenger car rainproof sealing limit. Value and test method. According to the requirements of GB/T12480-1990, the rainfall intensity of the rain test chamber is 4~10mm/min, the injection pressure of the nozzle is 69~147kPa, and the rain time is 15min. In the actual operation process, in order to strengthen the inspection of the rain sealing performance of the whole vehicle, the OEM often increases the rain intensity by increasing the density of the nozzle and increasing the water spray pressure. The rainfall intensity of the rain test room will be higher than the recommended value. Several times, some manufacturers even exceed 100mm/min, the nozzle injection pressure will reach 200kPa or more, so that the spray water will be sprayed onto the body after being atomized.
At different stages of vehicle production, OEMs have different test requirements for vehicles. During the trial production period of the vehicle, at this stage, the production process and equipment parameters of the whole vehicle are in the test period. Therefore, it is necessary to find the parts that may leak due to the long-term rain test (between 4 and 8 hours) of the whole vehicle. The analysis of the cause of water leakage and the improvement of the design or process, the design and process defects are basically improved when the whole vehicle is mass-produced, and the rain is mainly carried out routinely to prevent the sealing defects caused by the inconsistency of the accident.
Diatomaceous earth is very popular material these years.
Diatoms are tiny, single-celled algae found in plankton in ocean. Diatoms accumulated after they died, then fossilized into diatomaceous earth after hundreds of millions of years. The main components are silicon dioxide, light and porous. Electron microscope shows that diatomaceous earth is nanoscale porous material with diameter at 0.1-0.2 micrometers, the porosity is up to 90% and the pores are regularly organized into circles and its micropores quantity in unit area is several thousands times of active carbon's.
Such unique molecular characteristics contributed to the excellent function of diatomaceous earth.
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