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What are the differences in fan selection under different occasions

What are the differences in fan selection under different occasions

1. Roof exhaust fan shall be set preferentially if heat or steam exhaust is required. 2. When heating, cooling or fresh air supply is required, warm air or cold air flow should be allowed to flow through the position of the staff as much as possible, so pipe fans or side wall fans are often used. 3. For fire fighting and smoke exhaust, roof fans or hoisted air ducts shall be preferred, so pipe fans are often used. Note: Make full use of natural wind and air flow (fan position and form shall be reasonably set). Fan selection in specific occasions 1. Warehouse ventilation (1) To check whether the goods in storage are flammable and explosive, such as paint warehouse, explosion-proof fans must be selected. (2) Depending on the noise requirements, roof fans or environment-friendly centrifugal fans can be selected. (3) The most conventional fan or exhaust fan can be selected according to the air exchange volume required by the warehouse. picture 2. Kitchen ventilation (1) For kitchens that directly discharge lampblack indoors (that is, the air outlet is on the indoor wall), fans or exhaust fans can be selected according to the size of lampblack. (2) For kitchens with large lampblack, lampblack needs to pass through long pipes, and there is bending treatment in the pipes, it is strongly recommended to use centrifugal fans (4-72 centrifugal fans are the most common, and 11-62 low-noise and environment-friendly centrifugal fans are also very practical). This is because the pressure of centrifugal fans is higher than that of axial flow fans, and lampblack does not pass through the motor, so it is easier to maintain and replace the motor. (3) It is suggested that the kitchen with strong lampblack should use the above two schemes together for better effect.

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What is the difference between high-temperature fan and ordinary fan

What is the difference between high-temperature fan and ordinary fan

High temperature fan generally operates in the harsh environment of high temperature and pressure, so its structure, design principle and motor are more durable than ordinary fan. So where is the value of high-temperature fan? 1. The air inlet of high-temperature fan is designed by hydromechanics mechanism, with small air flow loss and high working efficiency of high-temperature fan. 2. The blade is designed according to the aerodynamic principle. The impeller consists of 10 backward inclined airfoil blades, a curved front disc and a flat rear disc. The materials are generally high-quality steel plates with high strength and good durability, which are subject to strict dynamic and static balance correction. 3. The motor is high temperature resistant, and its fluid part is made of high temperature resistant materials with good cooling effect. Compared with ordinary fans, the utility model has the advantages of firm structure, convenient and fast operation, and high cost performance. High temperature fans are mainly used in drying industry, boiler industry, cleaning industry and food drying industry. The tolerance temperature is between 75 and 850 ℃. The gas transported is air or other non spontaneous combustion, spontaneous explosion, winding, harmless to human body and corrosive to steel materials. Therefore, high temperature fans need to use high temperature and corrosion resistant materials.

07

2022

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08

Characteristics of permanent magnet motor

Characteristics of permanent magnet motor

Structure and permanent magnet materials of permanent magnet motor Permanent magnet motor has the following forms: (1) rectangular pulse wave current, and permanent magnet brushless DC motor PMBDC has rectangular pulse wave current. (2) Sine wave current, permanent magnet reluctance synchronous motor PSM has sine wave current. (3) Hybrid permanent magnet motor. Permanent magnet materials: (1) Rare earth samarium cobalt: maximum energy density. (2) Neodymium iron boron: extensive resources, good processability.

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Baking fan: how to choose high-quality manufacturers?

Baking fan: how to choose high-quality manufacturers?

First, we can choose different baking fans according to the different nature of the conveyor. For example, when conveying some cleaning tools or some gas with dust content, the concentration is limited and can be used for ventilation. When delivering some corrosive gases, you should choose the ones that are durable, explosion-proof or lined. The specific situation should be determined according to the characteristics of the product. With more and more manufacturers making baking fans, they have gradually improved. So many inexperienced customers don't know how to choose, so they can't choose or find a high-quality manufacturer when choosing things. Let's take a look. A good company needs to have an official website, because my website has their production line address and contact information. These can help you to select the appearance of the baking fan, and you can see some professional knowledge in the following evaluation. Besides, the brand of this manufacturer is not big. If the brand is sufficient, the quality must be stable, otherwise it cannot develop to the present. So if you don't know about it, you can use this brand symbol to choose, and then see how the scale is. What you see on the Internet today is limited. Then we can choose the baking fan manufacturer below. In some distant places, we don't recommend to go to some nearby and suitable ones, so we can do research and field investigation. If the scale is relatively large, and the product quality can be controlled, you can also spot check the products in the warehouse, and then make patient choices. I think it will be very reassuring. In addition to these, we should also consider whether it is a small manufacturer if it is lower than the market price, and whether it has any advantages if it is higher than the market price. It is more appropriate to choose a baking fan manufacturer that is not high or low. Very high or low is tricky. Only by mastering these points can we better understand them in this process. Cuicui Co., Ltd. specializes in making this product. If you have the opportunity, you can contact us. You can get some feedback on this quality. Many companies will give a good evaluation after using our products. They have many years of practical experience in this market. Don't worry about some loopholes. This is the factory of baking fan. Professional informatization is trustworthy, do you think?

07

2022

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08

How is the air volume of the fan calculated?

How is the air volume of the fan calculated?

The definition of fan air volume is: The product of wind speed V and sectional area F of air duct. Because the wind speed of large fan can be accurately measured by anemometer, the air volume calculation is also very simple. The air volume can be calculated directly by using the formula Q=VF. To determine the number of fans, it is necessary to calculate the total air volume required by the plant according to the air exchange rate of the selected room, and then calculate the number of fans. Calculation formula: N=V × N/Q, in which: N -- number of fans (set); V - site volume (m3); N -- Ventilation rate (times/hour); Q -- single air volume of the selected fan model (m3/h).

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2022

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How to select and purchase fans for the plant

How to select and purchase fans for the plant

The fan model shall be selected according to the actual situation of the plant, and the fan model matching the original window size shall be selected as far as possible. The fan and the wet curtain shall be kept at a certain distance (installed on both sides of the gable of the plant as far as possible) to achieve good ventilation effect. The exhaust side shall not be close to the nearby buildings as much as possible to avoid affecting the nearby residents. Fan air pressure: refers to the resistance to be overcome in the process of conveying so many air volumes, and refers to the pressure rise. However, domestic fans are generally selected according to full pressure, while foreign fans are generally selected according to pressure rise. External residual pressure=total pressure of fan resistance of each processing section of the air cabinet. The resistance of the air supply and return duct is generally 7~8Pa/m, and the resistance of 90 ° elbow is 10Pa/piece. Empirical formula: external residual pressure=total pressure of fan - resistance fan power of each treatment section (W)=air volume (L/S) * air pressure (Kpa)/efficiency (75%)/force rate (75%) Total pressure=static pressure+dynamic pressure. Fan motor power (W)=fan power (W) * 130%=air volume (L/S) * air pressure (Kpa)/efficiency (75%)/power ratio (75%) * 130%

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