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Maintenance of key components of laminar flow hoods
Maintenance of key components of laminar flow hoods(1) Filter replacementThe filter is the "heart" of the laminar flow hood, and its role is to capture small particles and microorganisms in the air to ensure that the output air meets high cleanliness standards. With the increase in use time, the filter will gradually be blocked by dust, particulate matter, etc., resulting in a decrease in filtration efficiency, which will affect the overall performance of the laminar flow hood. In general, the replacement cycle of the initial effect filter is 1-6 months, and the high-efficiency filter is 6-12 months, but this is not absolute, and the actual replacement cycle also needs to be determined according to the cleanliness of the use environment, frequency of use and other factors. For example, in the electronic chip manufacturing workshop, due to the high environmental cleanliness requirements, and more dust particles in the workshop, the high-efficiency filter may need to be replaced every 6 months; In some relatively clean laboratories, if the frequency of use is low, the high-efficiency filter may be used for 12 months. When replacing the filter, strictly follow the following steps: First, turn off the power supply of the laminar flow hood to ensure that the device is stopped to avoid accidents during the replacement process; Then, open the box of the laminar flow cover, carefully remove the old filter, pay attention not to touch the filter material of the filter, to prevent damage to the filter material affecting the filtering effect; Then, install the new filter into the box in the correct direction, ensuring that the filter is tightly fitted to the frame, without gaps, to prevent unfiltered air leakage; After the installation is complete, close the box, and check the installation of the filter again. After confirming that the installation is correct, switch on the power and start the laminar flow hood. After the filter is replaced, it is necessary to debug the laminar flow hood and use the anemometer, dust particle counter, and other devices to detect the wind speed and cleanliness of the outlet to ensure that the laminar flow hood returns to a normal working state. (2) Fan maintenance As the "power source" of the laminar flow hood, the fan provides the power for the airflow, and its performance directly affects the operation effect of the laminar flow hood. Fan maintenance points are many, and the regular addition of lubricating oil is one of them. Generally, every 2000-3000 hours of operation, it is necessary to add an appropriate amount of lubricating oil to the bearing of the fan to reduce friction between the bearings, reduce wear, and extend the service life of the fan. When adding lubricating oil, it is necessary to choose the lubricating oil suitable for the fan model and add it in strict accordance with the prescribed amount to avoid adding too much or too little. Adding too much may lead to oil leakage, contaminating equipment and the working environment; Adding too little will not play a good lubricating role and increase the risk of fan failure. At the same time, it is necessary to regularly check whether the fan blades are damaged and accumulate dust. Check the appearance of the blade at least once a month to see whether there is any damage such as cracks or deformation. If the blade is damaged, replace it in time to avoid the blade falling off during operation, damaging the equipment, or causing safety accidents. For dust accumulation on the blade, a soft brush or vacuum cleaner can be used to clean it to ensure that the blade surface is clean, reduce air resistance, and ensure the normal operation of the fan. In addition, it is also necessary to check whether the motor of the fan works normally, including the temperature, current, speed, and other parameters of the motor. If the motor temperature is too high, the current is too large or the speed is abnormal, it should be stopped in time to check, find out the cause of the fault, and repair it. (3) Electrical system inspection The electrical system is the "nervous system" of the laminar flow hood, which controls the start, stop, and operation of the equipment. It is essential to check the electrical system regularly, with a full inspection at least once a month. Check whether the power cables, plugs, switches, and electrical components are securely connected and whether there is aging or damage. You can manually shake the power cord, plug, and other parts to check whether there are signs of loosening; Observe the surface of the electrical components to see if there are abnormal conditions such as burning, discoloration, cracking, etc. For aging, damaged power cables, plugs, and electrical components should be replaced in time to avoid leakage, short circuits, and other safety accidents. For example, if it is found that the outer cover of the power cord is damaged and the internal wire is exposed, the laminar flow cover should be stopped immediately and a new power cord should be replaced to ensure the safety of use. At the same time, it is also necessary to check whether the grounding of the electrical system is good and whether the grounding resistance meets the requirements. Good grounding can effectively prevent damage to personnel and equipment when electrical equipment leaks. Generally, the grounding resistance is not greater than 4 ohms. Use a professional grounding resistance tester to check the grounding resistance. If the grounding resistance does not meet the requirements, locate the cause and rectify the fault in time. For example, check whether the grounding cable is disconnected and the grounding electrode is corroded to ensure the grounding safety and reliability of the electrical system. In addition, it is also necessary to check whether the control panel of the laminar flow cover is working normally, whether the buttons and indicators are sensitive and accurate, and if there is a fault, it should be repaired or replaced in time. |
