DC Cross Fan

Cross flow fan features:
1. The cross flow fan uses a relatively long cylindrical fan impeller to work. The diameter of this cylindrical fan blade is relatively large. Because of the large diameter, it can use a relatively low speed on the basis of ensuring the overall air circulation, thus reducing the noise caused by high-speed operation.
2. The impeller of the fan has been dynamically balanced: just as the wheels of the car need to be dynamically balanced, the wind wheel of the cross flow fan also needs to do this work. In short, it is to maintain the balance of the wind wheel in the running state, reduce noise, and extend the life of the fan. Dynamic balancing is a time-consuming job. In fact, the result may be adding counterweights to a part of the wind turbine. However, the service life of the cross flow fan is directly affected by the position and size of the fan.
3. The fan blades of the fan are calculated carefully, so that the distance between the fan blades is intentionally disordered, presenting a “unequal distance” condition: this is also very simple, that is, efforts are made to make the audio generated by the rotating wind wheel and the air “irregular”, become “a piece of wind sound”, rather than the wind sound on a certain frequency band in the set. There are two kinds of noise: narrowband noise and broadband noise. Regular narrowband noise tends to attract people’s attention and annoy them; The broadband noise is close to the noise situation in nature. Although it cannot be eliminated, it is relatively “durable”, which makes people less upset.
4. Fan blade manufacturing materials: The fan impeller in the fan is very long. If such a barrel shaped fan blade is made of inferior materials, it can save a lot of costs. However, it will be deformed soon after turning. The whole fan blade is no longer in a straight line, but droops in the middle. You can imagine how noisy such a drooping fan blade is when it is turned, and it will drive the entire fan curtain to vibrate!
5. Motor: The wind wheel depends on the motor to make it run. If the motor is poor in quality, it cannot run normally, or it has no power to start. If the motor is poor in quality, you will hear the “buzz” of the motor, which is more torture.

Fan Coil Cleaning Scheme for Commercial Central Air Conditioners
As a mechanical combination, fan coil unit has the function of cooling, and is generally used in the occasion where cooling is required. Because of this, it is also often used in commercial central air-conditioning. The components of commercial central air conditioners are very complex. For such a system, how should the fan coil cleaning scheme be formulated? Here are some suggestions.
After the fan coil units of commercial central air conditioners have been used for a period of time, dust and germs will accumulate on the fins and impellers. When the dust reaches a certain thickness, the heat dissipation effect of the fins will be affected, resulting in the room temperature failing to meet the requirements. In addition, the fan coil units that are not cleaned for a long time will breed many kinds of bacteria, which will cause respiratory diseases of human body. Therefore, experts suggest that you should clean the fan coil units regularly.
After refrigeration, the central air conditioning host sends the 7 ℃ water into the fan coil unit, which is exchanged into 15-16 ℃ cold air, thus reducing the room temperature.
However, there are many dust particles in the atmosphere. Under the long-term effect of air extraction and return, the aluminum fins of the fan are full of dust and dirt. At this time, on the one hand, the heat exchange between chilled water and hot air is affected, so the air temperature drops.
The cleaning of commercial central air-conditioning fan coil system is a part of the cleaning of central air-conditioning pipes, including return air, supply air, small fins and other components. The advantages of cleaning fan coil units are as follows: remove bacteria and dust in the air supply and return systems, and improve indoor air quality; Reduce the wind resistance of the VAV air conditioning unit, improve the heat exchange efficiency, increase the air supply volume, and save energy; Reduce operation cost and improve asset value; Maintain the fan coil system regularly to prolong the service life of the unit.
The cleaning methods of commercial central air-conditioning fan coil are generally divided into dry cleaning method and wet cleaning method:
·The dry cleaning method is mainly used to maintain the cleaning of the fan coil through dust suction cleaning. The cleaning cycle and frequency are generally once a month, and chemical cleaning agents are not used in the cleaning process;
·The wet cleaning method is mainly used to maintain the cleaning of the fan coil through the combination of vacuum cleaning and biological environmental protection reagents. The cleaning cycle and frequency are generally once every 6 months.
The cleaning of commercial central air-conditioning fan coil units is of certain technicality. If you are not familiar with the cleaning of central air-conditioning fan coil units, it is recommended that you ask professionals to clean the central air-conditioning fan coil units, so as to avoid damage to the central air-conditioning fan coil units and affect the use effect of air conditioning.