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There are mainly DC fans, AC fans, cross flow fans, axial fans, centrifugal fans and Guan Daofeng machines. Next, we mainly introduce the DC fans, and how much do you know about DC fans? Let's learn together. First of all, we need to know what a direct current fan is, and the direct current fan is a fan that can rotate the DC motor to drive the fan impeller to rotate, thus realizing the transformation of direct current energy into mechanical energy. The biggest characteristic of the DC fan is the selection of the DC motor. At present, the DC blower mostly uses brushless DC motor, and the brushless DC motor is greatly simplified in structure because of saving the collector ring and brush for excitation. At the same time, it not only improves the technological property of the motor, but also increases the mechanical reliability of the motor and increases the life of the motor. At the same time, the air gap magnetic density can be greatly improved, the motor index can achieve the best design. The direct effect is that the motor volume is reduced and the weight is reduced. Not only that, but also has excellent control performance compared with other motors. This is because: first, the torque constant, torque inertia ratio and power density of the motor are greatly improved because of the high performance of permanent magnetic material. Through reasonable design, it can greatly reduce the moment of inertia, electrical and mechanical time constant and other indicators. As the main index of servo control performance has been greatly improved. Secondly, the design of modern permanent magnet magnetic circuit is relatively perfect, plus the coercive force of permanent magnet material is high, so the ability of permanent magnet motor to resist armature reaction and its anti magnetic ability is greatly enhanced, and the control parameter of motor is greatly reduced with external disturbance. Third, because the permanent magnet instead of the electric excitation, the design of excitation winding and excitation magnetic field is reduced, so that many parameters such as excitation flux, excitation winding inductance, excitation current and so on are reduced, which directly reduces controllable variables or parameters. The above factors can be said that permanent magnet motor has excellent controllability. Then we need to know what features of the DC fan are: (1) small loss and high efficiency Because permanent magnet excitation is adopted, the loss of excitation current of induction motor is eliminated, and permanent magnet brushless DC motor operates in synchronous operation mode, eliminating the rotor frequency core loss of induction motor. These two aspects make the running efficiency of the permanent magnet brushless DC motor far higher than that of the induction motor, and the efficiency of the small capacity motor is more obvious. (2) high power factor Because the excitation magnetic field of Brushless DC motor does not need reactive power of the grid, its power factor is much higher than that of induction motor. Brushless DC motor can run at 1 power factor, which is very advantageous for small power motor. Compared with the induction motor, brushless motor not only has higher efficiency and power factor but also has more advantages in light load than the rated load. (3) good speed control and simple control Compared with the variable frequency speed regulation of induction motor, the speed control of Brushless DC motor is not only simple, but also has better speed control performance. (4) the inverter has low capacity, so the cost of the inverter is low A brushless DC motor needs a rectangular wave current, and the current rating of the inverter refers to the peak of the rectangular wave. An induction motor needs a sinusoidal current, and the current rating of the inverter is generally referred to as the value of the sine wave. In order to maintain the control ability of the inverter to the motor current, there should be enough difference between the DC voltage of the inverter and the induction electromotive force of the motor. Therefore, the peak value of trapezoidal wave induction electromotive force and induction motor electromotive force of induction motor is limited by DC voltage of inverter. In this case, if the peak value is equal to the brushless DC motor and induction motor current, the output power is 33% higher than the latter, that is to say, the brushless DC motor with a rectifier / inverter can drive 33% higher than the output power of the induction motor. Finally, we need to know about the application of the direct current fan. Widely used in computer, communication products, photoelectric products, consumer electronics, automotive electronics, medical equipment, exchanger, heaters, air conditioners, inverter, automatic teller machine, car refrigerator, welding machine, electromagnetic oven, audio equipment, environmental protection equipment, refrigeration equipment and other traditional or modern equipment.

This article will introduce the performance, the material and the use of the axial fan, and will also answer the advantages and disadvantages of the axial fan and the centrifugal fan. 1. What is an axial-flow fan? The so-called axial fan is the same direction of air flow with the axis of the wind blade, such as an electric fan, and the fan is an axial flow fan. The reason why it is called "axial flow" is because the gas is parallel to the flow of the shaft of the wind. Axial flow fans are usually used in occasions with higher flow requirements and lower pressure requirements. The axial flow fan holds the position and moves the air. The axial fan is mainly composed of the fan impeller and the casing, and the structure is simple but the data is very high. Its working principle is that when the impeller rotates, the gas enters the impeller from the inlet, and the energy of the gas increases, and then flows into the guide vane. The guide blade deflects the gas flow into the axial flow, and introduces the gas into the diffuser tube, and then converts the gas kinetic energy into the pressure energy, and finally the working pipe is introduced. The mode of the blade of an axial flow fan is similar to the wing of an aircraft. However, the latter acts up the lift up the wing and supports the weight of the aircraft, while the axial flow fan holds the position and moves the air. The cross section of an axial flow fan is generally a wing profile. The blade can be fixed in position or revolving around its longitudinal axis. The angle of the blade and the air flow or the spacing of the blade can not be adjusted or adjustable. Changing the angle or spacing of the blade is one of the main advantages of an axial flow fan. The angle of the blade spacing produces a lower flow rate, and the increase of the spacing can produce a higher flow rate. The advanced axial flow fan can change the blade spacing when the fan is running (this is quite similar to the helicopter rotor), thereby changing the flow accordingly. This is called a VP axial flow fan. 2. Use of axial fan: Can be used for metallurgy, chemical industry, light industry, food, medical equipment, mechanical equipment and civil construction places such as ventilation or enhance heat dissipation. If the shell is removed, and can also be used free fan, but also in the exhaust pipe to the longer interval are arranged in series, in order to improve the air pressure in the pipeline Axial fan features: Small axial fan: low power consumption, fast heat dissipation, low noise, energy saving and environmental protection and so on. It is widely used because of its small size. The large axial fan has the characteristics of simple structure, stable and reliable, small noise, large air volume, wide range of function and so on. 3. The advantages and disadvantages of the axial fan and the centrifugal fan. The main difference between the centrifugal fan and the axial fan is the difference between the centrifugal fan and the axial fan. 1, the centrifugal fan changes the flow direction of the medium in the wind pipe, and the axial flow fan does not change the flow direction of the medium in the wind pipe. 2. The former is more complex. 3, the former motor and fan are usually connected by a belt to drive a rotating wheel, and the latter is generally in the fan. 4, the former is often installed in the air conditioning unit, outlet, boiler drum, fan, and so on. The latter is often installed in the wind pipe or in the front of the outlet of the wind pipe.

As an employee of a company, how can you not be familiar with your own products? So how to make yourself familiar with the product (heat dissipation fan) as soon as possible? Don't worry? Come with me: The first day has just entered the firm, the boss took us to visit the factory, introduced to the director and supervisor, then let the supervisor gave us a position on the line (to the wind machine, a retaining ring) began to teach us how to tighten the buckle head, is actually very simple, just a little fee eyes. This can be very rapid eye and hand speed! After that, the boss let us stay in the workshop for a week, so that we can do every pipeline job. The purpose is to make us better familiar with products and have a general understanding of products. In this workshop the experience of life, in each job everyone do their job, but will also help each other, there will be several workers take turns off the bench, where the lack of manpower, he will soon come off the bench or help accelerate progress, so this requires that he is familiar with each gang a, each post can be started quickly. This can ensure the smooth production of the product, streamline flow, delivery time on time. But when the line of work, have found a little problem, I begin not familiar with the product, the product model, I have absolutely ignorant of the parameter name for each product components and products, so in my line of work, I will ask the next general, what is this part of this part what is the role of, why should this test fan is good or bad, but they did not answer, not answering my questions although they will do this, know how to do, but do not know why. Of course, for the director and director, these questions are a piece of cake. Their familiarity with the product I just eye-opening, such as their fan Dian under the weight of that is used in copper or aluminum, know what is the use of models, what is the thickness of the stator, press the fan, which is used to know what is bearing, ball bearing or bearing, and more the miracle is to machine this process, they will turn the fan, listening to the sound of fan to judge the quality, which are used on the test instrument, it is artificial test instrument! In this one week workshop experience in life, have a general understanding of the product name, type, of course, the product parameters are not well understood, the need to strengthen the later, and then gradually familiar, and everyone is familiar with the shop workers, will greet each other, joking, man well, always get along well with each other in the process of contact and mutual understanding.

What is the AC fan: The AC fan is mainly used for the heat dissipation of electronic products and the small exchange fan of general purpose. It is widely used in the household electrical appliances industry, the machinery industry, the manufacturing equipment industry and other products with the ventilation and heat dissipation requirements. The motor structure of this kind of fan is a hood - level motor, and the rotor is fixed with the impeller. The air duct is integrated with the positioning frame and the stator. This structure is simple, easy to produce, and easy to install and use. Classification and product introduction of AC fan: Classification in appearance: 8025.8038.9225.9238.11025.12025.12038.15050.17238.17251.20060 To use voltage classification: 110V, 220V, 380V E - bearing type S-> Sleeve bearing B-> single ball bearing D-> double ball bearing F - rated voltage 11->AC110V 22->AC220V 38->AC380V G - speed type L-> low speed X-> ultra low speed H-> high speed E-> ultra high speed Speed in M-> The environment conditions of the AC fan: Working temperature -----------10 C ~60 C Storage temperature ------------40 C ~70 C Humidity - 10%~80%RH Storage humidity - 10%~90%RH Product safety performance experiment: 1. Drop test In the case of minimum packaging, the fan can withstand the fall of any side down from 30 centimeters to 10 millimeters of thickness. 2.Lock the protection When the motor is locked at the rated voltage to stop the operation, the fan can withstand 72 hours without fire and combustion. 3.Insulation resistance strength Can resist a 2500V voltage of 2 seconds 1m between the two wire and the body

First of all, let us understand the basic common sense of the explosion-proof axial fan. Scope of application Suitable for conveying flammable and non corrosive gases, the ambient temperature shall not exceed 60 DEG C, widely used in general factory, warehouse, office, residential ventilation or strong heat, the exhaust pipe also can have a longer interval are arranged in series, in order to increase the pressure of the pipeline, remove the fan motor to do. Anticorrosive axial flow fan is made of anticorrosive material and coated with epoxy paint. The motor uses special anticorrosive motor to transport corrosive gases. Explosion-proof axial fan is used to transport flammable and explosive gas. It is suitable for the environment of T1~T4. The impeller is made of aluminum alloy to prevent sparking during operation, and the motor is flameproof motor. 1. The scope of application of explosion-proof axial fan: 1. Dangerous places for explosive gas mixtures: 1 zones and 2 areas. 2, explosive gas mixture: II A, II B. 3, temperature group: T1 to T4. 4, explosion-proof sign: Exd II BT4. Two, explosion-proof axial fan product features: 1. The explosion-proof axial fan is composed of explosion-proof motor, fan blade, wind drum and other parts. 2, fan used large chord, space warps, oblique type wide blade, the premise that drive at low speed, can achieve the required air volume, air pressure; 3. The impeller structure is adjustable, and it can be adjusted properly according to the requirements of the air outlet of the user and the use place, which is convenient and flexible. 4, impeller installation adopts symmetrical type. According to different adjustment angles, positive and negative two-way ventilation can be realized at the same installation position, which will bring convenience for users to install and use on site. 5. Low noise, low energy consumption and reliable explosion-proof performance. 6, the installation method is flexible and varied, there are wall, pipe, post, fixed. 7, the impeller speed (or motor power or air volume) can be selected according to the requirements of the user. Three. The installation of explosion-proof axial fan: Fixed type: the fixed type can also be divided into the wall type, also called the pipe type, the fan is fixed in the air vent. Position type: also known as mobile, with post support, with roller on the bracket, can move everywhere, easy to use.

How much do you know about the type of the fan? Next to all of you to popularize the knowledge of the type of downwind machine: First of all, what is the fan? The fan is a machinery which relies on the mechanical energy input to increase the pressure of gas and discharge the gas. It is a kind of driven fluid machinery. Fan classification: (according to different properties can be divided into different types) as follows: Fan according to the use of material classification can be divided into several kinds, such as iron fan (ordinary fan) glass steel fan, plastic fan, aluminum, stainless steel fan fan etc. The fan classification can be divided into centrifugal, axial flow, oblique flow (mixed flow) and crossflow type according to the direction of gas flow. (1) centrifugal fan. The axial flow of the air flow is mainly along the radial direction after the axial flow of the airflow into the impeller of the fan. This type of fan is made in accordance with the principle of centrifugal action. The products include centrifugal fan, centrifugal blower and centrifugal compressor. (2) axial fan. The airflow axially enters the impeller of the fan, and flows along the axis of the cylindrical surface approximately. This type of fan includes axial-flow fan, axial flow blower and axial compressor (3) rotary fan. The volume of the air chamber is changed by rotating the rotor to carry out the work. The common varieties are roots blower and rotary compressor. The flow direction of the fan is divided into axial flow fan, centrifugal fan and inclined flow (mixed flow) fan according to the flow direction of the air flow into the impeller. Fans are divided into pressing local fans (hereinafter referred to as pressing fans) and flameproof motors, which are placed outside the flow channel or in the flow channel, and the flameproof motors are placed in the explosion-proof sealed cavity with the extractable local fan (hereinafter referred to as the extraction fan). The fan can also be divided into single, double or multistage pressurized fan in the form of pressure. If 4-72 is a single stage pressure, the high end fan is a multistage pressure fan. The fan can be divided into axial flow fan, mixed flow fan, roof fan, air conditioner fan and so on. The fan can be divided into low pressure fan, medium pressure fan and high pressure fan according to pressure. According to the export pressure (boost) is divided into: ventilator (less than 15 thousand Pa), blower (1.5 ~ 350 thousand Pa), compressor (over 350 thousand Pa).

1. First of all, we need to know what parts of the fan are made up of? The good or bad of each part also determines the good or bad of the fan. The outside of the fan is made up of a frame, a fan blade and a leading edge line, and the inner of the fan is made up of a stator, a rotor, a bearing and a enameled wire. The good or bad of the parts that make up the fan determines the good or bad of the fan. The frame is divided into rubber frame and aluminum alloy frame. Fan blades are divided into general plastic and fireproof materials, and fireproof material is added with glass fiber, which has the effect of flame retardance. It can prevent spontaneous combustion caused by heat generated by fans when rotating at high speed. The thickness of the stator is also an important factor in determining the good or bad of the fan. The stator has 6310 and 6313 stator, and the 6313 is obviously better than the stator of 6310. Here we need to mention the bearing especially. The bearing is a crucial part. At present, the famous brands of fan bearings are NSK, SKF, IKO, FAG and other imported bearings. 2. How to identify the blower without testing instruments? We all know that the ancient Chinese "smell, and we can also use the fan set," Hope ": you can watch the stator is not correct, there is no matter ring;" smell "can rotate the fan fan, listen to sound (the need to have the experience to measure technology); and the need to push the ball, there is no elasticity test. All of these can help us test whether a fan is qualified or not.

1. What is a pipe fan? The control parameters of the pipe fan are air volume, total pressure, efficiency, noise and motor power. According to the physical and chemical properties of the transported gas, the ventilator of different uses is selected. 2. Its product features: 1. pipe ventilator selection control parameters are air volume, full pressure, efficiency, noise, motor power and so on. 2. choose different uses of ventilator according to the physical and chemical properties of the transported gas. For transporting clean air, general ventilators should be chosen; inflammable and explosive gases should be chosen, explosion-proof ventilators should be chosen; corrosive fans should be chosen for transporting corrosive gases. 3., when ventilator is selected, we should consider the loss of the air leakage and the calculation error of the pipeline system, as well as the negative deviation between the actual air volume and the wind pressure of the fan, and generally adopt the safety factor of air volume of 1.05~1.1 and 1.10~1.15 of wind pressure. But it is not too big to prevent the ventilator from running in a low efficiency area for a long time. 4. pay attention to the matching relationship between the resistance characteristics of the pipe network and the fan characteristics. In order to make the ventilation function run stably, the ventilator should work near its highest efficiency point. The working point of the fan is located on the right side of the total pressure peak point in the performance curve, that is, the large air volume side, and is generally located at 80% of the total pressure peak. 5. for the ventilation system with muffling requirements, we should first choose a fan with high efficiency and low impeller circumferential speed, and work in the vicinity of the highest efficiency point. According to the transmission mode of noise and vibration of the ventilation system, the corresponding measures of noise reduction and vibration reduction should be taken. 6., through changing the shape of blade, the pipe ventilator can make part of the axial flow and partial centrifugal effect after the air flow enters the fan, so its performance is between the axial flow fan and the centrifugal fan. The 7. pipe ventilator provides medium air pressure and medium air volume. It is suitable for the ventilation system in the high-rise civil buildings. 3. The main points of its installation are: The installation of 1. fan (foundation, hanger) should have the strength, stability and durability enough, pedestal vibration should meet the following requirements: 1) the vibration frequency of the basic device should not be greater than the 1/3 of the motor and the fan speed. 2) the difference between the vibration speed of the ventilator and the vibration speed of the ventilator at rest is more than 3 times more than that of the fan. 2. the connection between the inlet and outlet of the ventilator and the wind pipe should be provided with a flexible joint. The air inlet pipe, air outlet pipe and other devices should be supported separately and firmly supported by the foundation or other components of the building, and the shell should not bear the weight of other parts. 3. when the ventilator is installed on the building components, vibration isolation measures should be taken. The installation of 4. ventilator can be carried out according to the standard design atlas of the following countries. The 5. pipe ventilator can be installed on the straight pipe, which has the advantages of convenient takeover and small space.

For a fan the length of life, the wind machine maintenance also plays a vital role in them, in daily life, people are likely to ignore the fan maintenance, then I will tell you how to maintain the fan, thereby prolonging the service life of the fan: First, open the equipment shell, then open the fan, the fan closed equipment supply, 2CM distance with air gun, blowing fan; then wipe with industrial alcohol dirt fan above, then tilt the body to adjust the clearance position, after a good tune with the wind blowing dust gun device. From the front of the equipment to the equipment, it needs to be cleaned and rotated again and again until clean. Two. The wind speed of the AC fan is determined by a variety of factors. The most important two reasons are the bearing of the AC fan. 2.1, ball bearing: bearing on the long-term ion in air oxidation, dirt and dust accumulation, will lead to increased resistance to the bearing, the wind speed decreased gradually. 2.2, bearing: AC fan bearing, mainly depends on the friction between the stator and the coil rotates, and the bearing oil, with the use of fans, non-stop work and time consumption, reduce gradually, work by using the wind turbine, wind speed more slowly. Three. The lifespan of the fan will vary according to the different use environment, assuming that working in a standard environment. AC ball fan life 3.1, the average is about 50 thousand hours, the products of different manufacturers will have to distinguish: Germany EBM, Taiwan SUNON, Shenzhen NIDEC, the winner, Shenzhen Yongchang manufacturers such as the product life of -6 million in the 50 thousand hours; AC fan 3.2, the general life of oil for 25 thousand hours, due to the bearing wear will make repeated rotation, short service life, high quality manufacturers to 30 thousand -3.5 million hours of life; The equipment needs to be cleaned and cleaned at least once a month. Air entry net should be kept clean to prevent airflow, and clean or compressed air can be cleaned with a soft brush. Do you know if you have a deeper understanding of the maintenance of the fan through the above knowledge? I hope this article can help you better, thank you for reading!

What are the advantages and disadvantages of the DC fan and the AC fan? The fan is mainly the difference of motor. The difference between the AC fan and the DC fan. The former power supply is AC, and the supply voltage will be positive or negative. Unlike DC, the power supply voltage of the fan is fixed. It must rely on circuit control to make two sets of coils work alternately to produce different magnetic fields. AC fan for power frequency is fixed, the pole changing speed so the silicon steel sheet, determined by the power frequency, the higher frequency magnetic field switching speed faster, faster speed, theory, principle of DC fan like pole number more speed faster. However, the frequency can not be too fast, too fast will cause the difficulty of activation. AC motor has become the most commonly used motor because of the great development of AC power system. Compared with DC motor, AC motor has no commutator (see commutation of DC motor), so it is simple in structure, easy to manufacture and firm, and easy to make motor with high speed, high voltage, large current and large capacity. The coverage of AC motor power greatly, from a few watts to several 101000 watts, even millions of kilowatts. DC motor has complex manufacturing process and high cost. It can't use DC motor in the place of AC motor. Sometimes the DC motor is more convenient in the absence of electricity, so the use of fans is different and different. For example, the radiator fan inside the battery charger, the computer CPU, the computer chassis heat dissipation fan are 12 volts and 1 ampere specifications of the DC drive fan. AC fan fan is AC driven AC fan cases such as suction heating boiler draft fan 220 volt 0.25 amps 40 watts of power, but also rural Kang above the chimney. But the AC fan is not better than the direct current fan. About fan maintenance: first, open the equipment shell, then open the fan, the fan closed equipment supply, 2CM distance with air gun, blowing fan; then wipe with industrial alcohol dirt fan above, then tilt the body to adjust the clearance position, after a good tune with the wind blowing dust gun device. From the front of the equipment to the equipment, it needs to be cleaned and rotated again and again until clean.