The parameters are as follows:
Specification 120x 120x38 model YA2 1238HBL
Cooling fan type (AC) voltage 1 10V/220V/380V.
The rotating speed is 2400~3000 rpm, and the current is 0.3a/0.6a.
classify
Axial fan
The blades of the axial fan push the air to flow in the same direction as the shaft. The impeller of an axial fan is similar to a propeller. When working, most airflow flows parallel to the axis, in other words, it flows along the axis. When the inlet airflow of axial flow fan is free air with static pressure of 0, its power consumption is the lowest, and it will increase with the increase of airflow back pressure during operation. Axial flow fans are usually installed in the cabinet of electrical equipment and sometimes integrated into the motor. Axial flow fan is widely used because of its compact structure, saving a lot of space and convenient installation.
Its characteristics: large flow and moderate wind pressure.
centrifugal blower
When the centrifugal fan works, the blades push the air to flow along the direction perpendicular to the axis (that is, radial direction), the air inlet is along the axis direction, and the air outlet is perpendicular to the axis direction. In most cases, the cooling effect can be achieved by using an axial fan. However, sometimes if the airflow needs to rotate 90 degrees to be discharged or needs a large wind pressure, it is necessary to choose a centrifugal fan. Strictly speaking, a fan is also a centrifugal fan.
Its characteristics: limited flow and high wind pressure.
Mixed flow fan
Mixed flow fan is also called diagonal flow fan. At first glance, there is no difference between mixed flow fan and axial flow fan. In fact, the air inlet of mixed-flow fan is along the axis, but the air outlet is along the diagonal direction between the axis and the vertical axis. Because the blades and cover of this fan are conical, the wind pressure is higher. Under the same size and other comparable performance, the noise of centrifugal fan is lower than that of axial fan.
It is characterized by large flow and relatively high wind pressure.
Tubular fan
Tubular airflow can produce large-area airflow, which is usually used to cool large-area surfaces of equipment. The inlet and outlet of the fan are perpendicular to the axis (as shown on the right). The cross-flow fan works with a relatively long cylindrical fan impeller, and the diameter of the cylindrical fan blade is relatively large. Because of its larger diameter, it is possible to use a relatively low rotational speed on the basis of ensuring the overall air circulation, thus reducing the noise generated during high-speed operation.
Its characteristics: low flow and low wind pressure.
supporting structure
brief introduction
Common bearings of cooling fan are: ball bearing, oil bearing and magnetic bearing.
ball
Ball bearings change the friction mode of bearings and adopt rolling friction. There are some steel balls or columns between the two iron rings, supplemented by some grease lubrication. This method effectively reduces the friction phenomenon between bearing surfaces, effectively improves the service life of fan bearings, and therefore reduces the heat generation of radiator and prolongs the service life. The disadvantage is that the process is more complicated, resulting in higher cost and higher working noise.
oil-retaining bearing
Sleeve bearing is a sliding friction sleeve bearing, and lubricating oil is used as lubricant and drag reducer. It can be said that it is the most common bearing technology on the market now. Because of its low cost and simple manufacture, many products, including famous brands, are still in use. Its advantages are quiet initial use, low noise and low price.
Magnetic suspension bearing
The motor of magnetic bearing adopts magnetic levitation (MS) design, and the rotor is suspended in the air by magnetic force, so that there is no mechanical contact between the rotor and the stator. Its principle is that the magnetic induction line is perpendicular to the magnetic levitation line and the shaft core is parallel to the magnetic levitation line, so that the weight of the rotor is fixed on the running track and supported in the direction of the anti-magnetic levitation line by the almost empty shaft core, forming the whole rotor suspended on the fixed running track. Compared with traditional ball bearings and oil-bearing bearings, magnetic bearings have no mechanical contact, and the rotor can run at a very high speed, which has the advantages of low mechanical wear, low energy consumption, low noise, long service life, no lubrication and no oil pollution, and is especially suitable for special environments such as high speed, vacuum and ultra-clean. In fact, magnetic levitation is only an auxiliary function, not an independent bearing form. The specific application must cooperate with other bearing forms, such as magnetic suspension+ball bearing, magnetic suspension+oil bearing, magnetic suspension+vaporization bearing and so on.
Technical indicators
air amount
Air volume refers to the total amount of air discharged or brought in by the cooling fan every minute. If calculated in cubic feet, the unit of air volume is CFM；; If calculated in cubic meters, it is CMM. The air volume unit often used by cooling fans is CFM (about 0.028 cubic meters per minute).
Air volume is the most important index to measure the cooling capacity of cooling fans. Obviously, the greater the air volume, the higher the cooling capacity of the cooling fan. This is because the heat capacity ratio of air is fixed, and the larger the air volume, that is, the more air per unit time, the more heat will be taken away. Of course, the heat dissipation effect is related to the airflow mode under the same air volume.
wind pressure
Wind pressure and air volume are two relative concepts. Generally speaking, under the consideration of cost saving by manufacturers, to design a fan with large air volume, some wind pressure must be sacrificed. If the fan can drive a lot of air to flow, but the wind pressure is small, the wind will not blow to the bottom of the radiator (which is why some fans have high speed and large air volume, but the heat dissipation effect is not good). On the contrary, large wind pressure often means small air volume, and there is not enough cold air to exchange heat with the heat sink, which will also cause poor heat dissipation effect.
Fan speed
Fan speed refers to the number of revolutions per minute of fan blades, and the unit is rpm. The speed of the fan is determined by the number of turns of the coil in the motor, the working voltage, the number of blades, the inclination angle, the height, the diameter and the bearing system. There is no necessary relationship between speed and fan quality. The speed of the fan can be measured by internal speed signal or external measurement.
With the change of application and ambient temperature, fans with different speeds are sometimes needed to meet the demand. Some manufacturers specially designed cooling fans with adjustable fan speed, including manual and automatic ones. Manual operation mainly allows users to use low speed in winter to get low noise, and use high speed in summer to get good heat dissipation effect. The automatic temperature-regulating radiator is generally equipped with a temperature control sensor, which can automatically control the speed of the fan according to the current working temperature. If the temperature is high, the speed will be increased, and if the temperature is low, the speed will be reduced to achieve a dynamic balance, so that the wind noise and heat dissipation effect can be maintained at an optimal combination point.
Fan noise
In addition to the heat dissipation effect, the working noise of the fan is also a common concern. Fan noise is the noise generated when the fan is working, which is influenced by many factors, and the unit is decibel (dB). When measuring the noise of the fan, it needs to be carried out in an anechoic room with the noise less than 17dB, one meter away from the fan, aligned with the air inlet of the fan along the direction of the rotating shaft of the fan, and measured by A-weighted method. The frequency spectrum characteristics of fan noise are also very important, so it is necessary to record the frequency distribution of fan noise with a spectrometer. Generally, the noise of the fan is required to be as small as possible, and there can be no abnormal sound.
Fan noise is related to friction and airflow. The higher the fan speed, the greater the air volume and the greater the noise, and the vibration of the fan itself is also a factor that cannot be ignored. Of course, the vibration of high-quality fans will be small, but the first two are difficult to overcome. To solve this problem, we can try to use a bigger fan. Under the same air volume, the working noise of large fan at low speed is less than that of small fan at high speed. Another factor that we tend to overlook is the orientation of the fan. Because of the friction and collision between the rotating shaft and the bearing when the fan rotates at high speed, it is also a main source of fan noise.
App application
Widely used in computers, communication products, photoelectric products, consumer electronics, automotive electronic equipment, switches, medical equipment, heaters, air conditioners, frequency converters, ATMs, car freezers, welding machines, induction cookers, audio equipment, environmental protection equipment, refrigeration equipment and other traditional or modern instruments and equipment.