How to dissipate heat for the electrical components and equipment in the cabinet is knowledge. Today, we will not cover how to choose suitable temperature control products such as air conditioners, fans, water heat exchangers, etc., but only discuss the topic of fan installation.
The installation of the cooling fan in the cabinet, many people think that it is very easy. Install the cabinet cooling fan wherever there is space in the cabinet. Whether it is installed on the door panel or the side panel, it is enough to blow the air into the cabinet to dissipate heat. In fact, this method is not correct. The wrong installation of the fan not only limits its cooling effect but also causes other problems, such as causing dust accumulation in the cabinet and hot spot convergence.
In the electrical industry, those with fans are collectively called fans, and those without fans are called filter windows or grilles only for ventilation. A common application is a fan with a filter window, the fan blows natural air into the cabinet or exhausts the hot air inside the cabinet. The filter window is composed of a plastic grille and a filter pad for natural ventilation, and the filter pad is used to filter dust and fine particles from the air.
The installation of the cooling fan of the cabinet is divided into the following steps:
Determine the fan installation direction:
Generally speaking, the fan should maintain positive pressure in the cabinet, so it should blow air into the cabinet; the reason is that if the fan draws air outside the cabinet, it will cause negative pressure in the cabinet, and the outside air will directly flow from the gap of the cabinet door and the side of the top plate. The unfiltered air enters the cabinet directly, which will cause dust to accumulate in the cabinet after a long time.
Generally speaking, the positive pressure is better than the negative pressure when the fan is installed in the cabinet, that is, the air is blowing into the cabinet. The reason is that the air blowing inside is filtered, and the dust in the air is filtered, so as to avoid the failure of the electrical and electronic equipment in the cabinet caused by dust accumulation.
Identify the location of the fan opening:
The installation of the cabinet fan needs to consider the reasonable position of the air inlet and outlet to ensure that the air in the cabinet can be convected and the hot air in the cabinet can be smoothly brought out.
Note: The use of a fan is only effective when the temperature inside the cabinet is higher than the ambient temperature. Because the density of hot air is lower than that of cold air, the airflow in the cabinet will be from bottom to top. Therefore, in general, the lower part of the front door or side panel of the cabinet is used as the air inlet, and the upper part is used as the exhaust port.
When the hot spots of some devices are on the top, side, or front door, so that the cabinet cannot open holes for the fans, it is necessary to open holes at the top.
The correct choice of cooling fan and filter grill for the cabinet:
If the working site environment is not ideal, and there is dust, oil mist, water vapor, etc. that affect the normal operation of each component in the cabinet, then a filter fan should be selected at the air inlet, and a filter grille should be selected at the air outlet to prevent dust, oil mist, water vapor, etc. Enter the cabinet. Dust and corrosive particles enter the control cabinet and will be adsorbed on the electronic components under the action of static electricity. Conduction produces a short circuit and burns the circuit board, causing a major accident.
1. Air volume, if the space of the cabinet is relatively large, it is necessary to choose a cooling fan with a large air volume.
2. The fan with a high speed has a large air volume.
3. Power consumption, the life of the cooling fan should be long, so as to reduce the maintenance cost. The greater the power consumption, the shorter the life of the bearing, so the lower the power consumption, the better.
4. Noise, when the cooling fan is running at a high speed, it is easy to generate large noise. When choosing a cooling fan with medium performance, it is necessary to avoid excess performance and reduce power consumption and noise.
The above is a brief introduction to cabinet cooling fan selection skills, I hope it can help you.