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Knowledge of Industrial Cooling Fans
- Categories:Technology
- Author:rain
- Origin:capital
- Time of issue:2024-03-28 09:42
- Views:
(Summary description)Knowledge of Industrial Cooling Fans Air has the function of heat dissipation. It transfers heat energy and can be compressed. When it is compressed, static pressure transfers air fluid. Although its thermal conductivity is relatively low, compared to other fluids, air is the most commonly used thermal conductive substance. It is readily available and can be applied to heating surfaces everywhere Air usually returns from the surrounding atmosphere to the main body of the heat source together. The main body will be cooled or cooled, after all, the object is always in the air. That is, using another substance to cool a heat source, ultimately reducing the temperature of the heat source is still air. Usually, the heat dissipation of the heat source is achieved through direct or indirect air flow Let's first learn about the cooling fan [axial flow fan]! Principle: The working principle of a fan is achieved through energy conversion, namely: electrical energy → electromagnetic energy → mechanical energy → kinetic energy. The circuit principle is generally divided into various forms, and the performance of the fan will vary depending on the circuit used Composition of axial flow fan: Fan frame, blades, bearings, PCB control circuit, drive motor Speed: Speed refers to the speed at which a fan rotates, usually measured by the number of turns it turns in one minute, i.e. RPM. Speed is related to the number of turns and diameters of the electromechanical winding, the diameter of the wire, the outer and bottom diameters of the fan blade and impeller, the shape of the blade and the bearings used, and other factors. As the speed increases, the air volume correspondingly increases The size of the rotational speed value to a certain extent represents the size of the air flow. When the conditions are constant, the higher the rotational speed, the greater the noise and vibration. Therefore, when the air flow meets the heat dissipation requirements, low-speed fans should be used as much as possible. General rotational speed size [using DC axial flow fans as an example]: 2510 fans at 7000 to 12000 rpm; 3010 fan, 5000-9000rpm; 4010 Fan 5000-7000rpm; 5010 Fan 3500-5000rpm; 6025 fan 2600-4500rpm; 7025 fan, 2400-3600rpm; 8025 fan 2000-3500rpm; 9225 fan 1600-3100rpm; 12025 fan 1200-2500rpm; 12038 fan 2000-3200rpm The fan speed can be tested through BIOS or other built-in monitoring software on the motherboard when starting the computer; It can also be tested using a speed tester. Note that the first two methods must be measured by a fan that supports speed measurement function The main performance parameters of a cooling fan include flow rate, pressure, speed, power, etc The electrical structure of the cooling fan: The cooling fan consists of the following three parts: 1. Control part: composed of Hall magnetic effect switches, transistors, resistors and other components. Its function is to control the direction of current in the stator coil winding 2. Motor winding part: composed of silicon steel sheet, enameled wire, and upper and lower insulation frames. The function of the silicon steel sheet is to guide the magnetic poles out to determine the strength of N and S. The winding determines the directionality of the magnetic field lines, including N and S poles and control signals, constantly changing the polarity of the winding, driving the magnetic frame to operate, and achieving the purpose of doing work 3. Fixed magnetic field section: The fixed magnetic field is provided by the adhesive magnetic field to generate power during rotation Air volume and air pressure: There are two methods for testing air volume and air pressure: one is to use a wind tunnel instrument for testing, and the other is to use a double box method for testing. However, for general users, there is no such equipment, and only the data provided by the manufacturer can be used as a reference, and the final cooling effect depends on *Air volume: Air volume refers to the product of the plane velocity of the ventilation area of the fan. Ventilation area is the area of the outlet minus the projection area of the vortex tongue. Plane velocity is the gas movement speed of the airflow through the entire plane, in m3/s. When the plane velocity is constant, the larger the outer diameter of the fan blade impeller, the larger the ventilation surface area, the greater the air volume. Plane velocity is determined by the speed and wind pressure of the rotor. When the ventilation area is constant, the larger the plane velocity, the greater the air volume. The larger the air volume, the greater the heat absorption of the air. When the air flow is transferred, more heat can be taken away, and the fan heat effect is more obvious *Wind pressure: In order to conduct normal ventilation, it is necessary to overcome the resistance within the fan's ventilation stroke. The fan must generate pressure to overcome the supply air resistance. The measured change in pressure is called sta
Knowledge of Industrial Cooling Fans
(Summary description)Knowledge of Industrial Cooling Fans
Air has the function of heat dissipation. It transfers heat energy and can be compressed. When it is compressed, static pressure transfers air fluid. Although its thermal conductivity is relatively low, compared to other fluids, air is the most commonly used thermal conductive substance. It is readily available and can be applied to heating surfaces everywhere
Air usually returns from the surrounding atmosphere to the main body of the heat source together. The main body will be cooled or cooled, after all, the object is always in the air. That is, using another substance to cool a heat source, ultimately reducing the temperature of the heat source is still air. Usually, the heat dissipation of the heat source is achieved through direct or indirect air flow
Let's first learn about the cooling fan [axial flow fan]!
Principle: The working principle of a fan is achieved through energy conversion, namely: electrical energy → electromagnetic energy → mechanical energy → kinetic energy. The circuit principle is generally divided into various forms, and the performance of the fan will vary depending on the circuit used
Composition of axial flow fan:
Fan frame, blades, bearings, PCB control circuit, drive motor
Speed:
Speed refers to the speed at which a fan rotates, usually measured by the number of turns it turns in one minute, i.e. RPM. Speed is related to the number of turns and diameters of the electromechanical winding, the diameter of the wire, the outer and bottom diameters of the fan blade and impeller, the shape of the blade and the bearings used, and other factors. As the speed increases, the air volume correspondingly increases
The size of the rotational speed value to a certain extent represents the size of the air flow. When the conditions are constant, the higher the rotational speed, the greater the noise and vibration. Therefore, when the air flow meets the heat dissipation requirements, low-speed fans should be used as much as possible. General rotational speed size [using DC axial flow fans as an example]: 2510 fans at 7000 to 12000 rpm; 3010 fan, 5000-9000rpm; 4010 Fan 5000-7000rpm; 5010 Fan 3500-5000rpm; 6025 fan 2600-4500rpm; 7025 fan, 2400-3600rpm; 8025 fan 2000-3500rpm; 9225 fan 1600-3100rpm; 12025 fan 1200-2500rpm; 12038 fan 2000-3200rpm
The fan speed can be tested through BIOS or other built-in monitoring software on the motherboard when starting the computer; It can also be tested using a speed tester. Note that the first two methods must be measured by a fan that supports speed measurement function
The main performance parameters of a cooling fan include flow rate, pressure, speed, power, etc
The electrical structure of the cooling fan:
The cooling fan consists of the following three parts:
1. Control part: composed of Hall magnetic effect switches, transistors, resistors and other components. Its function is to control the direction of current in the stator coil winding
2. Motor winding part: composed of silicon steel sheet, enameled wire, and upper and lower insulation frames. The function of the silicon steel sheet is to guide the magnetic poles out to determine the strength of N and S. The winding determines the directionality of the magnetic field lines, including N and S poles and control signals, constantly changing the polarity of the winding, driving the magnetic frame to operate, and achieving the purpose of doing work
3. Fixed magnetic field section: The fixed magnetic field is provided by the adhesive magnetic field to generate power during rotation
Air volume and air pressure: There are two methods for testing air volume and air pressure: one is to use a wind tunnel instrument for testing, and the other is to use a double box method for testing. However, for general users, there is no such equipment, and only the data provided by the manufacturer can be used as a reference, and the final cooling effect depends on
*Air volume: Air volume refers to the product of the plane velocity of the ventilation area of the fan. Ventilation area is the area of the outlet minus the projection area of the vortex tongue. Plane velocity is the gas movement speed of the airflow through the entire plane, in m3/s. When the plane velocity is constant, the larger the outer diameter of the fan blade impeller, the larger the ventilation surface area, the greater the air volume. Plane velocity is determined by the speed and wind pressure of the rotor. When the ventilation area is constant, the larger the plane velocity, the greater the air volume. The larger the air volume, the greater the heat absorption of the air. When the air flow is transferred, more heat can be taken away, and the fan heat effect is more obvious
*Wind pressure: In order to conduct normal ventilation, it is necessary to overcome the resistance within the fan's ventilation stroke. The fan must generate pressure to overcome the supply air resistance. The measured change in pressure is called sta
- Categories:Technology
- Author:rain
- Origin:capital
- Time of issue:2024-03-28 09:42
- Views:
Knowledge of Industrial Cooling Fans
Air has the function of heat dissipation. It transfers heat energy and can be compressed. When it is compressed, static pressure transfers air fluid. Although its thermal conductivity is relatively low, compared to other fluids, air is the most commonly used thermal conductive substance. It is readily available and can be applied to heating surfaces everywhere
Air usually returns from the surrounding atmosphere to the main body of the heat source together. The main body will be cooled or cooled, after all, the object is always in the air. That is, using another substance to cool a heat source, ultimately reducing the temperature of the heat source is still air. Usually, the heat dissipation of the heat source is achieved through direct or indirect air flow
Let's first learn about the cooling fan [axial flow fan]!
Principle: The working principle of a fan is achieved through energy conversion, namely: electrical energy → electromagnetic energy → mechanical energy → kinetic energy. The circuit principle is generally divided into various forms, and the performance of the fan will vary depending on the circuit used
Composition of axial flow fan:
Fan frame, blades, bearings, PCB control circuit, drive motor
Speed:
Speed refers to the speed at which a fan rotates, usually measured by the number of turns it turns in one minute, i.e. RPM. Speed is related to the number of turns and diameters of the electromechanical winding, the diameter of the wire, the outer and bottom diameters of the fan blade and impeller, the shape of the blade and the bearings used, and other factors. As the speed increases, the air volume correspondingly increases
The size of the rotational speed value to a certain extent represents the size of the air flow. When the conditions are constant, the higher the rotational speed, the greater the noise and vibration. Therefore, when the air flow meets the heat dissipation requirements, low-speed fans should be used as much as possible. General rotational speed size [using DC axial flow fans as an example]: 2510 fans at 7000 to 12000 rpm; 3010 fan, 5000-9000rpm; 4010 Fan 5000-7000rpm; 5010 Fan 3500-5000rpm; 6025 fan 2600-4500rpm; 7025 fan, 2400-3600rpm; 8025 fan 2000-3500rpm; 9225 fan 1600-3100rpm; 12025 fan 1200-2500rpm; 12038 fan 2000-3200rpm
The fan speed can be tested through BIOS or other built-in monitoring software on the motherboard when starting the computer; It can also be tested using a speed tester. Note that the first two methods must be measured by a fan that supports speed measurement function
The main performance parameters of a cooling fan include flow rate, pressure, speed, power, etc
The electrical structure of the cooling fan:
The cooling fan consists of the following three parts:
1. Control part: composed of Hall magnetic effect switches, transistors, resistors and other components. Its function is to control the direction of current in the stator coil winding
2. Motor winding part: composed of silicon steel sheet, enameled wire, and upper and lower insulation frames. The function of the silicon steel sheet is to guide the magnetic poles out to determine the strength of N and S. The winding determines the directionality of the magnetic field lines, including N and S poles and control signals, constantly changing the polarity of the winding, driving the magnetic frame to operate, and achieving the purpose of doing work
3. Fixed magnetic field section: The fixed magnetic field is provided by the adhesive magnetic field to generate power during rotation
Air volume and air pressure: There are two methods for testing air volume and air pressure: one is to use a wind tunnel instrument for testing, and the other is to use a double box method for testing. However, for general users, there is no such equipment, and only the data provided by the manufacturer can be used as a reference, and the final cooling effect depends on
*Air volume: Air volume refers to the product of the plane velocity of the ventilation area of the fan. Ventilation area is the area of the outlet minus the projection area of the vortex tongue. Plane velocity is the gas movement speed of the airflow through the entire plane, in m3/s. When the plane velocity is constant, the larger the outer diameter of the fan blade impeller, the larger the ventilation surface area, the greater the air volume. Plane velocity is determined by the speed and wind pressure of the rotor. When the ventilation area is constant, the larger the plane velocity, the greater the air volume. The larger the air volume, the greater the heat absorption of the air. When the air flow is transferred, more heat can be taken away, and the fan heat effect is more obvious
*Wind pressure: In order to conduct normal ventilation, it is necessary to overcome the resistance within the fan's ventilation stroke. The fan must generate pressure to overcome the supply air resistance. The measured change in pressure is called static pressure, which is the difference between the maximum static pressure and atmospheric pressure. It is the pressure exerted by a gas parallel to the surface of an object, and static pressure is measured through holes perpendicular to its surface The conversion of kinetic energy required in gas flow into pressure form is called dynamic pressure
To achieve the purpose of air supply, static pressure and dynamic pressure are required. Total pressure is the algebraic sum of static pressure and dynamic pressure, and total pressure refers to the total pressure increase given by the fan, that is, the difference in total pressure between the outlet and inlet of the fan. In practical applications, the nominal maximum air volume value is not the actual air supply volume obtained by the fan heat exchanger. A large air volume does not represent strong ventilation capacity. Due to the obstruction of the fan heat exchanger or component in its flow path during air flow, its impedance will limit the free flow of air. That is, as the air volume increases, the air pressure will decrease. Therefore, there must be an optimal operating point, which is the intersection point between the fan performance curve and the wind resistance curve. At the working point, the slope of the fan characteristic curve is the smallest, while the rate of change of the system characteristic curve is the lowest. Note that the static efficiency of the fan [air volume x air pressure ÷ power consumption] is the best at this time. Of course, sometimes in order to reduce system impedance, even smaller fans can be selected to achieve the same air volume
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