The importance of air density for cooling fans

The air density is the key factor affecting the cooling performance of the cooling fan. Under different environmental conditions (such as temperature, altitude and climate), the air density will change, which will affect the heat dissipation effect. As a professional cooling fan manufacturer, our products cover 110V AC cooling fan and 220V AC cooling fan. We are both a professional 110 v ac cooling fan factory and a reliable 220 v ac cooling fan factory , committed to providing high-quality cooling solutions in various air density environments.

Influence of air density on cooling effect of cooling fan

High-density air (cold air) environment: In an environment with higher air density, such as a low temperature environment, the air contains more molecules per unit volume, making the air able to carry more heat, so the heat dissipation effect is better.

Low-density air (hot air) environments: At higher temperatures or at high altitudes, the air is less dense, reducing its heat transfer capacity. In this environment, the efficiency of the cooling fan will be reduced, especially for 220V AC cooling fans, and the performance in low-density air is an important design consideration.

How to measure the noise of cooling fan? What are the main factors related to the noise generated by cooling fans? How should we reduce the noise of cooling fans?

1、How to measure the noise of cooling fan?

Noise is the sound level generated by the cooling fan during operation, and its unit is decibel (dB).

Quiet cooling fan, when measuring the noise of the cooling fan, it needs to be carried out in a Anechoic Chamber with noise less than 17dB, one meter away from the fan, and aligned with the air inlet of the fan along the direction of the rotating shaft of the cooling fan.

The spectral characteristics of the noise of the cooling fan are also very important, so it is necessary to record the noise frequency distribution of the cooling fan with a spectrometer. Generally, it is required that the noise of the cooling fan should be small and there should be no abnormal sound.

2、What are the main factors related to the noise generated by cooling fans?

The noise of high speed exhaust fan is related to friction and air flow. The higher the rotating speed and the larger the air volume of the cooling fan, the greater the noise will be.

In addition, if the fan bearing lacks lubricating oil or has too much dust, it will also cause fan noise, which needs to be maintained and cleaned in time, so as not to damage the hardware equipment due to blocked cooling.

3、How should we reduce the noise of cooling fans?

To solve this problem, we can try to use larger cooling fans. Under the condition of the same air volume, the working noise of the fan with large size at lower speed is smaller than that of the fan with small size at higher speed.

Another factor that we easily overlook is the bearing of the cooling fan.

Brushless motor fan, because the rotating shaft and bearing collide with each other when the cooling fan rotates at high speed, it is also a main source of noise of the cooling fan.

Cooling fans are widely used, and their application environments are different. In harsh environments, such as outdoors, damp and dusty places, cooling fans are generally equipped with waterproof grade, that is, IPXX.

IP is the abbreviation of Ingress Protection, and IP grade is the protection grade against foreign body intrusion of electrical equipment shell, which comes from IEC 60529, the standard of International Electrotechnical Commission, which was also adopted as the national standard of the United States in 2004. In this standard, for the protection of electrical equipment enclosure against foreign objects, the format of IP grade is IPXX, where XX is two Arabic numerals, the first mark number indicates the contact protection and foreign object protection grade, and the second mark number indicates the waterproof protection grade.

IP is the code used to identify the protection level in the world. The IP level consists of two numbers. The first number indicates the range of dust resistance of the equipment, I represents the level of preventing solid foreign objects from entering, and the highest level is 6; The second number indicates the degree of waterproof, P represents the level of preventing water ingress, and the highest level is 8. For example, the protection grade of industrial cooling fan, ventilation system fan and air radiator fan is IP54, which is the most basic waterproof grade for short, namely, three-proof paint. The process is to immerse the whole PCB board. Now, the highest waterproof grade that the cooling fan can achieve is IP68, which is completely isolated from the outside world by vacuum coating or glue filling.

The first digit indicates the dustproof index:

No.	Scope of protection	Description
0	No protection	No special protection for people or things outside
1	Prevent the intrusion of solid foreign objects larger than 50mm	Prevent the human body (such as the palm) from accidentally contacting the internal parts of the appliance, and prevent the intrusion of foreign objects of larger size (diameter greater than 50mm)
2	Prevent the intrusion of solid foreign objects larger than 12.5mm	Prevent people's fingers from touching the internal parts of the appliance, and prevent foreign objects of medium size (diameter greater than 12.5mm) from intruding
3	Prevent the intrusion of solid foreign objects larger than 2.5mm	Prevent tools, wires and similar small foreign objects with a diameter or thickness greater than 2.5mm from intruding and contacting the internal parts of the appliance
4	Prevent the intrusion of solid foreign objects larger than 1.0mm	Prevent tools, wires and similar small foreign objects with a diameter or thickness greater than 1.0mm from intruding and contacting the internal parts of the appliance
5	Prevent foreign objects and dust	Completely prevent the intrusion of foreign objects. Although the intrusion of dust cannot be completely prevented, the amount of dust intrusion will not affect the normal operation of the electrical appliance
6	Prevent foreign objects and dust	Completely prevent the intrusion of foreign objects and dust

The second digit indicates the waterproof index:

No.	Scope of protection	Description
0	No protection	No special protection for people or things outside
1	Prevent the intrusion of solid foreign objects larger than 50mm	Prevent the human body (such as the palm) from accidentally contacting the internal parts of the appliance, and prevent the intrusion of foreign objects of larger size (diameter greater than 50mm)
2	Prevent the intrusion of solid foreign objects larger than 12.5mm	Prevent people's fingers from touching the internal parts of the appliance, and prevent foreign objects of medium size (diameter greater than 12.5mm) from intruding
3	Prevent the intrusion of solid foreign objects larger than 2.5mm	Prevent tools, wires and similar small foreign objects with a diameter or thickness greater than 2.5mm from intruding and contacting the internal parts of the appliance
4	Prevent the intrusion of solid foreign objects larger than 1.0mm	Prevent tools, wires and similar small foreign objects with a diameter or thickness greater than 1.0mm from intruding and contacting the internal parts of the appliance
5	Prevent foreign objects and dust	Completely prevent the intrusion of foreign objects. Although the intrusion of dust cannot be completely prevented, the amount of dust intrusion will not affect the normal operation of the electrical appliance
6	Prevent foreign objects and dust	Completely prevent the intrusion of foreign objects and dust

During the use of the cooling fan, the influence of humidity on the life of the fan cannot be ignored. Especially in industrial and household appliances, such as air conditioning cross-flow fans, cross-flow cooling fans and metal cross flow fans, humidity will not only affect the efficiency of heat dissipation, but also may adversely affect the internal structure of the fan.

How does humidity affect the life of the cooling fan?

High humidity environments pose multiple challenges to the motors, bearings and metal components inside cooling fans. High humidity may cause internal fan components to rust or corrode. In particular, fans with metal shells or internal components, such as metal cross flow fans, are more susceptible to humidity.

Chungfo's way of coping

In order to deal with the potential threat of humidity to the life of the fan, Chungfo strictly selects moisture-proof and rust-proof materials in the design and manufacturing process of the fan. For example, Chungfo's cross flow fan in air conditioners pay attention to corrosion resistance in the selection of materials, and have passed a number of humidity tests to ensure their long-term operation in high-humidity environments such as air conditioning equipment. Our cross-flow cooling fans are also designed with a moisture-proof seal structure, which effectively prevents moisture from entering the motor part, further extending the life of the fan.

Humidity has a profound impact on the life of cooling fans, especially for products such as metal cross-flow fans, cross flow cooling fans and air conditioning cross-flow fans that are exposed to high humidity for a long time. By selecting high-quality anticorrosive materials and conducting rigorous humidity life testing, Chungfo provides customers with more durable and reliable cooling fan products.

DC axial fan is made of PBT material. When it is working normally, the service life can be as high as 50,000 hours. The internal structure of the DC has a transformer and a main control board, which will not be affected by voltage fluctuations, so it is used Longer life.

High speed axial fan, its rotor contains DC cooling fan blades, which are the source of air activity, the fan axis, and are used to support the rolling of the balanced fan blades, the rotor magnetic ring, and permanent magnets. Ring frame, fixed magnetic ring.

In addition, DC cooling fan also includes a supporting spring, through which all the components and motors of the tube rolling are fixed, the rolling direction is produced, and the key to the size of the rolling speed can be activated. Its speed regulating performance is good, and the control is simple.

Generally, a cross flow fan has a multi-blade, long cylindrical impeller with forward multi-wing blades. At present, our cross flow fans are mainly divided into two types: AC cross flow fans and DC cross flow fans.

Cross flow cooling fan has a complicated internal structure. Although its impeller circumference is symmetrical, its airflow activity is asymmetrical, and its relative velocity field and absolute velocity field are unstable. The moving medium enters the impeller twice, and the rotor impeller moves along the circumference constantly.

There is a vortex on the inner side of one side of the impeller circumference that can control all airflow activities, that is, the so-called bias vortex of the cross flow fan. The vortex base is somewhere in the inner circumference of the impeller, and moves along the circumferential direction with different saving situations. It is the existence of this eccentric vortex that leads to cross flow.

Under certain working conditions, when the cross flow fan rotates at high speed, the gas in the cross flow fan cannot be discharged or sucked normally because of the enhanced control force of the eccentric vortex, and the experimental system presents an abnormal situation, which is called surge scene.

If the vent area is small, the resistance of the resistance layer is large, and the flow rate in the pipeline is small, the operation request of the cross flow fan is low, and the effect of deflecting the vortex is not obvious under the small flow rate. However, when the rotating speed is high and the vent area is large, the control force of the eccentric painful vortex is enhanced, and the gas in the cross flow fan can not be discharged or inhaled normally, so the experimental system is abnormal.

Current speed control by adjusting the input current to achieve speed control, the main features include:

High precision: can achieve more detailed speed adjustment, suitable for precision equipment.

Fast response: Especially suitable for scenarios requiring frequent speed regulation or large load fluctuations.

High efficiency: It performs particularly well in complex use environments.

The advantage of Chungfo electronic technology

As a professional cooling fan manufacturer, Chungfo Electronic Technology has always been committed to providing customers with high-performance cooling solutions. We offer a wide range of axial fans that support customized speed control solutions to ensure optimal performance in different application scenarios.

As a professional wholesale mini axial cooling exhaust fan manufacturer and a professional ac axial fan supplier, we provide customers with various models of wholesale axial flow fans, suitable for medical, instrumentation and other high-precision fields. Provide customers with customized cooling solutions covering many fields. Our product line covers the full range of needs from household equipment to industrial cooling equipment, supporting wholesale procurement to help customers achieve efficient cooling and cost optimization.

Servo motor, with its high precision, high efficiency and flexibility, has become the core driving component of modern industrial and intelligent equipment. Compared with the traditional dc micro brush motor and drive micro-motor, servo motor has stronger control ability and a wider range of application scenarios, and is occupying an important position in various fields.

Application scenario of servo motor

Industrial automation: servo motors are widely used in CNC machine tools, automated production lines and other equipment to provide high-precision power support.

Robot technology: servo motor is the core part of the robot joint, which can achieve multi-angle and multi-direction flexible movement.

Medical equipment: such as surgical robots, diagnostic equipment, servo motors can provide noiseless, high-precision drive.

As a professional cooling fan and motor manufacturer, Chungfo Electronic Technology not only provides DC micro-brush motor, but also provides driving micro motor and 1.2v dc vibrator motor , to meet customers' needs for high precision and high efficiency. Using high-quality materials and advanced processes, our servo motors combine performance and durability, making them the perfect choice for industrial and intelligent equipment.

For more information about servo motors or other products, please feel free to contact us!

Different types of speed regulation

1.Voltage speed regulation: By changing the input voltage to adjust the fan speed, mainly used in DC cooling fans. Although the cost is low, the accuracy and stability are slightly lower than that of current speed regulation.

2.PWM speed regulation: The use of pulse width modulation (PWM) signal to change the working period of the motor is currently the most widely used method, taking into account efficiency and accurate control.

3.Mechanical speed regulation: Adjust the speed by changing the fan blade Angle or installing different gears, which is more common in industrial heat dissipation equipment, but the adjustment process is more complicated.

4. Current speed control: Current speed control is a way to change the fan speed by adjusting the input current. It is usually used in DC cooling fans.

Practical application case analysis

Industrial heat dissipation device: For devices in high temperature environments, it is recommended to select the current adjustable speed fan, such as the axial cooling fan 110v, which can maintain stable performance under complex loads.

Household cooler fan: Choose the products provided by high quality cooler axial fan ac 220v manufacturer, which are both efficient and economical, suitable for scenarios requiring long-term stable operation.

Wholesale market demand: For customers who need to purchase in bulk, the axial flow fan wholesale price is more attractive, and it is also flexible to choose different speed regulation schemes to meet special needs

With the development of Internet information age, Industrial DC fans, Cooling fans, Cross flow fans and AC fans have been applied in many industries, such as household appliances, industrial equipment, electronic equipment, medical aviation and so on.

Have you ever encountered such a situation?

When the fan is used, the speed of the fan can meet the cooling requirements of the equipment, but when it is used for a long time, the speed of the fan will slow down.

What are the factors that make the speed of DC fan, Cooling fan, Cross flow fan and AC fan slow down?

1.First of all, fix the DC fan, Cooling fan, Cross flow fan and AC fan carefully when installing. If the fans are loose without fixing, the rotation speed of DC fan, Cooling fan, Cross flow fan and AC fan will also slow down.

2.Check the appearance of the fan for excessive dust accumulation, which makes it difficult for the fan to rotate. If there is resistance, the rotating speed will slow down. Therefore, pay attention to the environment of the fan and clean up the dust in time. In addition, a dustproof fan guard cover can be added to the fan, which not only enhances the fan air supply rate, but also functions to improve the overall performance of the fan.

3. The reason for the slow speed of the DC cooling fan may also be that there is a problem with the power supply, so users can also consider changing the silent power supply or cooling fan. There are many silent power supplies on the market at present, which are usually strictly tested and can effectively reduce the power supply noise. In addition, it can also change a better DC cooling fan for the power supply. The process of changing the power supply fan is also very simple. The key is to pay attention to the connection between the fan and the power supply.

Rotating speed is also one of the main parameters affecting the performance of cooling fans. Therefore, pay attention to check at any time!