The basis of a centrifugal fan is a rotating blade wheel called an impeller, which drags the incoming air or gas into a circular motion. It is then pushed out of the fan by the centrifugal force created by the rotation. When entering and exiting the fan, the airflow changes direction. This is the centrifugal fan principle.

In order to ensure the normal operation of the fan and improve the service life of the fan, we often carry out regular maintenance and maintenance on the various parts of the fan.

1. From the principle of the centrifugal fan, it can be seen that the impeller is an important component, so the maintenance of the impeller is essential. First, the impeller must be checked for cracks, wear and other defects from time to time. Second, the impeller must be kept clean, and the dust and rust on it should be brushed off regularly with a wire brush, because with the increase of operating time, these dusts cannot evenly adhere to the impeller, which will cause the impeller to lose its balance and cause the rotor to vibrate. Third, as long as the impeller is repaired, it needs to be dynamically balanced. If possible, you can use a portable test balancer for field balancing.

2. We also cannot ignore the maintenance of the casing and the air intake chamber. In addition to regularly checking the casing and intake chamber for severe wear and heavy dust accumulation, also regularly check that all fastening bolts are tight.

3. Bearing maintenance is equally important. In daily use, it is necessary to check the oil supply of bearing lubricating oil frequently. If there is oil leakage in the tank, you can slightly tighten the bolts of the end cover. If that doesn't work, you may have to replace it with new packing.

4. If we do not use the centrifugal fan for a long time, what maintenance work can be done? 1. When the ambient temperature is lower than 5 °C, the remaining water in the equipment and pipelines should be drained to prevent the equipment and pipelines from freezing. 2. Coat the surface of main parts such as bearings with anti-rust oil to avoid corrosion.

Guangdong Chungfo Electronic Technology Co., Ltd. focuses on the cooling needs of equipment in various industries, specializing in the research and development and supply of cooling fans such as DC cooling fans, AC cooling fans and DC blowers. For example, 5v centrifugal fan, 12v centrifugal fan, etc., we can provide professional customization of cooling fans according to customer needs.

DC cooling fan has two positive and negative power lines. When installing the cooling fan, if the positive and negative lines are connected reversely by wrong operation, will the cooling fan burn out?

Whether the axial cooling fan is burnt out or not is mainly related to the IC Design of the cooling fan. In general, the drive IC with double wire winding method has internal protection design. If the positive and negative power lines are connected reversely, it will show the phenomenon of short circuit. At this time, the current of the cooling fan will be much higher than that under normal conditions. The motor current is large and its temperature rise is high. When the temperature reaches a certain degree, the driving IC will be damaged due to overheating and the cooling fan will be burned out.

Some of the single winding drive IC has no internal polarity protection. If the motor stator PCB is not designed with polarity protection, it may burn out the IC instantly when connected.

In order to prevent the ventilation cooling fan from burning out due to positive and negative polarity connection, a diode is added on the PCB of the cooling fan to design polarity protection, that is, when the polarity of the cooling fan is connected reversely, the current is zero, showing no power supply, so it can protect the cooling fan from burning out.

The AC cooling fan needs maintenance after it has been used for a period of time, so that it can be used for a long time and its service life can reach the standard. What are the maintenance skills for AC cooling fans?

1. Open the shell of the equipment, then turn on the AC fan, turn off the power supply of the equipment, use the air gun 2cm away from the fan, and blow the fan; Then use industrial alcohol to wipe the dirt on the fan blades, then tilt the machine body to adjust the gap position, and then use the air gun to blow out the dust in the equipment. From the front of the equipment to the back of the equipment, it needs to be cleaned, and then rotate repeatedly until it is clean.

2. The wind speed of the AC cooling fan is determined by many factors, two of which are the bearings of the AC cooling fan,

Ball bearing: the long-term oxidation of air ions in the air to the bearing and the accumulation of dirt and dust will increase the friction resistance of the bearing and gradually reduce the speed of the fan.

Oil bearing: the AC fan with oil bearing mainly rotates by the mutual friction between the stator and the coil, and the oil in the bearing gradually decreases with the use of the fan, non-stop work and time consumption, resulting in slower and slower wind speed when the fan is used for work.

3. The service life of the AC fan varies according to different service environments. Assuming that it works in a standard environment, the service life of the general AC ball fan is about 50000 hours, and the products of different cooling fan manufacturers will also be differentiated. The service life of general AC oil bearing fan is 25000 hours.

4. Due to the repeated rotation of its bearings, the service life will be shortened due to wear, and the service life of high-quality manufacturers will reach 30000-35000 hours; The equipment shall be cleaned at least once a month. The air inlet network shall be kept clean to prevent blocking the air flow. It can be cleaned with a soft brush or compressed air.

The cooling fan is a small part, but it is not a dispensable part, but a part with extraordinary functions. Now most electronic devices have been popularized in our life. Cooling fans are required for household appliances and entertainment electronic facilities. So how can we protect our "little heart" from harming innocent people, affecting the normal use of the equipment and prolonging its service life. Chungfo is a fans manufacturers specializing in the production and sales of DC cooling fans, AC cooling fans, axial fans, centrifugal fans and blower fans. Pay attention to the Chhungfo brand, and we will share more knowledge about cooling fans with you.

Cooling fans are widely used in life, and various types of cooling fans have been produced due to different environments. So in order to adapt to the high humidity environment, how does the cooling fan achieve the function of waterproofing? The following are some introductions to the production process of waterproof cooling fans.

      At present, there are two grades of waterproof fans that are often used on the market, namely IP55 and IP68. Among them, IP55 waterproof fans only have simple moisture-proof functions. Its manufacturing method is relatively simple, that is, three layers of anti-paint are applied on the outer surface of the motor, which has anti-oxidation ability.

      1. In view of the needs of exhaust and heat dissipation in a high humidity environment, on the basis of the improvement of the waterproof performance of the traditional brushless ventilation fan, the motor is highly sealed by means of plastic sealing. The motor sealing material generally uses the same epoxy resin material as the chip packaging material. For some waterproof motors of high rpm exhaust fans, thermal silica gel with relatively high thermal conductivity can be used for sealing.

     2. IP68 waterproof fans generally use vacuum coating or plastic packaging. The vacuum coating process is similar to the semiconductor lithography technology, and a layer of nanomaterials is deposited on the surface of the object by vapor deposition in a vacuum environment. The film thickness is generally 5 to 30 microns. The coating process has the advantages of good heat dissipation effect and fast manufacturing speed. However, nanomaterials are generally not resistant to corrosion, and the films will peel off over time, which can be used in water vapor environments. The waterproof fan sealed with epoxy resin can resist corrosion and be impacted by water, but the manufacturing speed is slow, the heat dissipation effect of the motor is not good, and the price is relatively expensive.

     3. For products with high waterproof requirements, or products that may be immersed in water, immersed in water and run, the standard of waterproof cooling fans must be as high as IPX7. In this case, the entire motor must be completely isolated from other parts so that water does not interfere with the motor. At present, the more reliable method is to seal the motor PCB board with glue.

          If you need waterproof exhaust fan wholesale, please feel free to contact us.

Today, with the rapid development of electronic products, cooling fans are applied to almost all industries, such as medical equipment, intelligent household appliances, sports equipment, power supply equipment, communication industry, security monitoring, military equipment, automobile industry, automation industry, etc. in these industries, general cooling fans are far from meeting the needs of various equipment. Therefore, fans with PWM speed regulation function have become the first choice for intelligent devices, For example, humidifiers, massage chairs and frequency converters all need PWM speed regulating cooling fans.

Intelligent devices require different cooling effects of cooling fans in different time periods and working hours with different degrees of load, which can effectively reduce energy consumption, extend the service life of the device, and enable the device to reach the best state in any operating state. In addition, when the device is overloaded, it will generate more heat than usual, it can also send a signal to the fan to quickly remove heat in a short time, To reduce the damage to the equipment caused by the high internal temperature of the equipment, which can not be achieved by the cooling fan without the PWM speed regulation function, so how does the cooling fan use the PWM function to regulate the speed?

1. The speed of the fan is adjusted through the control circuit, which is controlled by the pulse width modulation signal. There are four lines, and the standard fan has only two positive and negative lines. It can use the frequency and high and low voltage levels to control the speed of the cooling fan, and change the duty cycle through the PWM controller, so as to achieve the purpose of controlling the speed of the fan.

2. The PWM  fan can set the most appropriate speed by detecting the ambient temperature through the temperature sensor, which can reduce the noise of the fan. The fan consumes less power when running at low speed, which can prolong the battery life, reduce the noise emitted by the fan, and increase the service life of the fan.

Guangdong Chungfo is a manufacturer specialized in R & D and production of cooling fans. Our fans support PWM speed regulation function and can also be customized according to different equipment working environment!

Cross flow fans are widely used, and some problems will inevitably occur in the process of long-term use. For example, cross flow fans sometimes experience surge. The surge phenomenon of the fan is like asthma, the fan periodically blows out and reverses the flow, and severe surge can also cause fatigue damage to the cross flow fan blade.

When the cross flow fan has surge phenomenon, there will be the following three manifestations.

1. Noise increases.

When the cross flow fan is working normally, the noise is relatively small. However, when the surge phenomenon occurs, the inside of the fan sometimes makes a dull sound, and sometimes makes a sharp sound, and the sound is relatively loud.

2. Vibration intensifies.

When the cross flow fan has surge phenomenon, there will be obvious vibration phenomenon.

3. Difficulty reading.

When the surge phenomenon occurs in the cross flow fan, the value displayed by the micro pressure gauge and the rotational speed torque meter changes rapidly, and the range and amplitude of the change are very large, showing a periodic change.

So for the surge phenomenon of the cross flow cooling fan, there are the following solutions.

1. The ambient temperature should be 75ºC≥-40ºC.

2. The industrial gas passing through the cross flow fan is not allowed to contain strong acid, strong alkali and various solutions.

3. Dust and other sundries are not allowed to fall into the fan, so as not to cause the fan to burn and the fan blades to break.

4. Before installation, check whether the fan is damaged or deformed due to packaging and transportation. If there is damage or deformation, it should be repaired and installed.

5. Check whether the parts and screws are loose, and whether the blades and the air duct collide or shift. If they collide or shift, they should be adjusted and installed.

If you would like to know more about mini cross flow fans and other types of fans, please feel free to contact us.

It is normal for the cooling fan to make a small amount of noise during use. As long as we control the noise within a reasonable range, it will have no effect on the cooling fan. So what should be done if the noise exceeds the normal range under special circumstances? The following points are the methods to effectively reduce the noise of AC axial cooling fan:

1. System Impedance

The higher the impedance of the cooling system and exhaust fan, the more noise out of the normal range. The higher the system impedance, the greater the air flow required for cooling. Therefore, in order to minimize noise, the system impedance must be minimized.

2. Airflow interference

Turbulence caused by obstacles encountered in the airflow path can generate noise. Therefore, it is necessary to avoid any obstructions of the cooling fan, especially in the range of the air inlet and outlet, which can reduce the noise.

3. Temperature rise

In a system, the air volume required for cooling is inversely proportional to the allowable temperature rise. Therefore, if the limit on the allowable temperature rise is slightly relaxed, the noise can be reduced.

4. Voltage change

Voltage variations can affect cooling fan noise. The higher the cooling fan voltage, the greater the vibration and noise caused by the increased rotational speed. Therefore, if the air volume is suitable, try to choose a low-voltage cooling fan.

5. Fan size

Because the high rpm exhaust fan produces more noise than the low rpm exhaust fan, and when the air volume is the same, the large-sized low rpm exhaust fan is usually quieter than the small-sized high rpm exhaust fan. Therefore, when the noise requirements are higher, a larger size low rpm cooling fan can be selected.

If you are just looking for a 110v ac cooling fan manufacturer, then we are a good choice. Guangdong Chungfo Electronic Technology Co., Ltd. focuses on the cooling needs of equipment in various industries, specializing in the research and development and supply of cooling fans such as DC cooling fans, AC cooling fans and DC blowers.We can provide professional customization of cooling fans according to customer needs.

The production of industrial equipment is inseparable from the accessories industrial cooling fan. The main function of the fan is to dissipate heat, cool and remove dust for various sizes of equipment. The general production environment of industrial equipment is relatively harsh. In order not to shorten the service life of the industrial cooling fan, some treatment will be done for the fan. The following are some of the more common anti-corrosion measures for industrial cooling fans.

Appearance treatment of industrial cooling fans: The surface protection treatment of cooling fans usually adopts galvanizing, chrome plating, chemical plating and other methods. These methods are valid in many environments, but for rotating parts, you must choose carefully. Because the substrate and the coating are two kinds of materials, their linear expansion coefficients are different, which will produce different deformations in the elastic deformation of the rotating parts, which will produce a large number of micro-cracks and accelerate the formation of corrosion. Therefore, the appropriate process must be selected according to the actual use environment.

Design of industrial cooling fan: The design of cooling fan is the performance of its core technology, and also affects the service life of cooling fan. In the structural design of cooling fans, the design defects most prone to accelerated corrosion are stress concentration tendencies and interstitial environments. Sometimes the corrosion rate in the metal immersion solution is small, but the formation of gaps can cause severe crevice corrosion due to changes in the chemical and electrochemical states of the internal solution, which requires careful design.

Materials of industrial cooling fans: Different cooling fans use different materials and have different anti-corrosion effects. After selecting the cooling fan model, the strength of the parts is determined from the base surface according to the corrosion resistance of different materials in different environments, the main application environment, working strength and other factors.

Guangdong Chungfo Electronic Technology Co., Ltd. focuses on the cooling needs of equipment in various industries. We are a cooling fan manufacturer specializing in R&D and supply of DC cooling fans, AC cooling fans and DC blower fans, etc. The product quality is excellent, the cooling fan gauge is complete, and the professional customization of cooling fans can be provided according to customer needs.

Air volume refers to the total volume of air discharged or incorporated by the cooling fan per minute. If it is calculated in cubic feet, the unit of air volume is CFM. In cubic meters, that's CMM. The air volume unit often used by cooling fans is CFM.

Air volume is the most important indicator to measure the heat dissipation capability of heat dissipation fans. Obviously, the greater the air volume, the higher the heat dissipation capacity of the cooling fan. This is because air has a certain heat capacity ratio, and a larger volume of air, which means more air per unit time, carries more heat. So what factors will affect the air volume of the cooling fan?

1. Fan speed. The fan speed refers to the number of rotation times of the fan blades per minute. The unit is rpm. The fan speed is determined by the number of turns of the coil in the motor, the working voltage, the number of fan blades, the inclination Angle, the height, the diameter and the bearing system. Fast speed, that is, the fan out of the air volume is larger, in the case of not considering other factors, fast fan can better heat dissipation, but its disadvantage is also obvious, that is, will shorten the service life. Of course, it is also related to fan bearings. If it is an oil-bearing, too high speed is not necessarily a good thing, and ball bearings can achieve a higher speed.

2. Fan size. In fact, the wind speed and pressure of the same size fan are inversely proportional. The faster the wind speed, the greater the amount of wind, the smaller the wind pressure accordingly, so that the wind can not completely blow to the bottom of the radiator, so that the heat will accumulate at the bottom, so that the cooling effect is weakened. Therefore, if you need to increase the air volume and pressure of the fan at the same time, the only way is to increase the size of the fan. However, increasing the size of the fan brings with it a series of problems, such as being overweight. Therefore, we should not blindly pursue high speed, we should choose the most suitable cooling fan for their products according to the specific requirements of customers.

Guangdong Chungfo Electronic Technology Co., Ltd. focuses on the cooling needs of equipment in various industries. We are a cooling fan manufacturer specializing in R&D and supply of DC cooling fans, AC cooling fans and DC blower fans, etc. The product quality is excellent, the cooling fan gauge is complete, and the professional customization of cooling fans can be provided according to customer needs.

First of all, when connecting the centrifugal cooling fan, the foundation joint surface, and the inlet and outlet air ducts, they should be adjusted to fit naturally, not forcibly connected, and the weight of the air ducts should not be concentrated on the casing to avoid deformation of the casing and affect the normal operation. The inlet and outlet air ducts of the centrifugal fan should be connected with hoses, and attention should be paid to the horizontal position of the fan.

Secondly, when installing the centrifugal ventilation fan, it is necessary to first check whether the connection of each part is tight, whether the rotation is sensitive, etc., and also check whether there are debris in the casing. After the installation is completed, it is necessary to check whether the installation tools are left out. Otherwise, it will affect the normal use of the fan, and even threaten the performance of the fan.

Finally, after the installation is completed, the trial operation can be carried out only after all parts are confirmed to be normal. In the process of trial operation, the current should be well controlled and the rated value should not be exceeded. In order to prevent the motor from being burnt due to overload, it must be carried out under no load when the 12 volt centrifugal fan is started and tested. If the condition is good, gradually open the valve until the specified operating conditions. After installation, try to rotate the impeller to check whether it is sensitive. If it is found to be wrong, it should be adjusted in time.