Working principle and necessity of dehumidifier in workshop warehouse of electronic factory

Working principle of dehumidifier in workshop warehouse of electronic factory;

After being sucked in by the fan, the treated air is filtered by the air filter net, and then cooled and dehumidified on the cooled evaporator, so that the excess water vapor in the air is condensed into water, which reduces the moisture content of the air. Because the dehumidified condensed water takes away part of the damp heat, the temperature of the air decreases accordingly. In order to make the air temperature and humidity suitable, the dehumidifier's unique structure makes the dehumidified air pass through the condenser to heat up, thus improving the ambient temperature and greatly improving the dehumidifying effect of the dehumidifier.

Moisture will enter the IC device through the joint surface of packaging materials and components, resulting in short circuit of internal circuit oxidation corrosion, and the high temperature during assembly and welding will make the wet gas entering the IC expand and generate pressure, which will cause the plastic to separate from the inside of the chip or lead frame (delamination), wire binding damage, chip damage, internal cracks and cracks extending to the surface of the component, and even cause the component to swell and burst, also known as "popcorn", which will lead to assembly repair or even scrap. More importantly, those invisible and potential defects will be dissolved into the product, which will cause problems in the reliability of the product. Most other IC electronic components also have the problem of moisture hazard.

Most electronic products are required to be stored under dry conditions. Otherwise, the capacity of capacitors will be reduced after being wetted, and integrated circuits are prone to internal faults after being wetted; Humidity will also make the computer CPU and card gold fingers and pins and connectors of electronic equipment oxidized, resulting in poor contact or poor solderability, crystal oxidation and so on. Storage of electronic devices in an environment with relative humidity of 40% can ensure safety.

Several tips for judging whether dehumidifier needs fluoride.

I believe most people don't know how to judge whether the dehumidifier needs fluoride or not. Here, the manufacturer of constant temperature and humidity machine introduces several simple tricks to help you judge:

(1) Test: After the dehumidifier is turned on normally for a period of time, the air blown out from the air outlet is a little hot and can reach the set humidity quickly. The compressor can be turned on and stopped for a while like a refrigerator, which can be said to be normal.

(2) Measurement: It is normal to measure the temperature difference between the inlet and outlet of the machine with a thermometer. The greater the temperature difference, the better the working condition of the dehumidifier, which can reach about 15℃.

(3) Touch: The evaporator is in a place where people can touch it. You can touch it by hand after 10 minutes of power-on. The compressor has two copper joints, one for thick copper pipe and the other for thin copper pipe. There should be a temperature difference between the two valves when touching them by hand; The temperature of the coarse one should be lower than that of the fine one, and it is normal to feel cool (there should also be condensed water when the temperature is high). Then touch whether the wind at the outlet is hot air or not. If it is not too hot, it may be short of fluorine.

(4) Look: After turning on the machine for more than ten minutes, open the air inlet panel of the machine, and you can see that the evaporator (the part where the copper tube is covered with aluminum sheets for heat exchange) is evenly covered with condensed water (like dew), which is normal (when the air humidity is high, it is more, and vice versa). If half of them are not, it may be fluorine-deficient. Such as local frosting or icing, is not normal.

(5) Inspection: If the machine has been used for more than half a year, you can check whether there are obvious signs of oil leakage at the pipe joints and machine valves of the dehumidifier. If there is obvious oil leakage, it indicates that the machine has leakage, because oil and fluorine are mutually soluble, oil leakage will lead to fluorine leakage, and fluorine leakage will lead to oil leakage.

How to solve the failure of industrial dehumidifier

Nowadays, industrial dehumidifiers are widely used in the production of industrial enterprises all over the country. Because humid air needs some humidity space, such as its enterprise workshop or warehouse, if it is not treated with humidity, it will cause huge losses under the long-term chain effect. The dehumidifiers purchased by most enterprises work for a long time, so the industrial dehumidifiers should be maintained regularly. However, during the maintenance of Hangzhou Zhongzheng Electric Appliance Co., Ltd., it was found that many manufacturers did not like to maintain the machine, which led to many failures and shortened the service life of the machine. Here, Hangzhou Zhongzheng Electric enumerates several solutions to common faults of industrial dehumidifiers, hoping to help everyone.

Fault 1: Fan motor does not turn.

Solution: First, check whether the blade is stuck on the shell, whether the motor bearing is burnt out, whether the motor coil is disconnected or burnt out, and whether the changeover switch is normal. Try to replace the motor, switch and motor bearing. If all these are normal, please contact this industrial dehumidifier manufacturer.

Fault 2: The dehumidifier stops running immediately after it starts running.

Solution: If the power cord is wrongly connected, replace the wrong cord first, stop the compressor for a few minutes after maintenance, and then start it. If this problem still occurs, please replace the relay or repair it.

Fault 3: The dehumidifier leaks water.

Solution: Check whether the drain pipe is blocked, whether the drain pipe is higher than the drain pan, and whether there is dust on the drain pan.

Fault 4: The dehumidifier is running normally and the dehumidification effect is not good.

Solution: Check whether there are obstacles around the machine, blocking the airflow, checking whether the heat insulation material on the pipeline is aging, whether there are many gaps, and whether the ventilation valve is closed tightly.

Fault 5: The dehumidifier vibrates greatly during operation, and the dehumidification effect is not good.

Solution: Check whether there is condensed water on the evaporator surface, whether there is leakage of refrigerant, and whether there is oil trace at the interface between high pressure pipe and condenser.

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