Electric fan buying guide

　　Classification of electric fans

　　1. Floor fan

　　The floor fan is the most common electric fan. The bottom is fixed by the base, and the support rod is raised to the height and then connected to the motor and fan blades. This type of fan has strong wind power and is suitable for larger rooms. It has a larger steering angle and can take care of as much space as possible. The disadvantage is that the gap between the grille and the grille is large, making it easy to get hurt. Child。

　　2. Rotary vane fan

　　The motor of the rotary-leaf fan is small and barely protrudes after being connected to the fan blades. The overall fan is only slightly larger than the fan blades. The wind direction is adjusted by rotating the grille in front of the fan blades, making it easy to move. However, because the motor is small, the air volume is also small.

　　3.Tower fan

　　The tower fan rotates through the internal wind wheel and releases the wind through the optical flow fan to form an airflow, which is similar to the principle of the air conditioner internal unit. The advantage is that it occupies a small area and has a stylish appearance, but the air volume is average, making it suitable for small apartments. The noise is a bit loud and it is difficult to clean the dust. Since most tower fans are not very high and cannot adjust the up and down angle, the wind direction is relatively low and often blows the legs.

　　4. Air conditioning fan

　　Air conditioning fans are also called cooling fans. In fact, they have nothing to do with air conditioners and do not have a compressor for cooling. An air conditioning fan inhales air through a motor and releases it after cooling. It usually uses water or ice crystals for cooling. The discharged air is a few degrees cooler than an ordinary fan, but it has basically no effect on the temperature in the house. Therefore, you can only feel cooler than an ordinary fan when the air conditioning fan blows directly on your body. However, because it uses water for cooling, the cool air blown out has a high humidity. It is very easy to get rheumatism if you blow it for a long time. If it is a humid climate in the south, it will become more humid. So there are two sentences that can be used to describe air-conditioning fans: "If you hate him, give him an air-conditioning fan"; "You can buy air conditioners and electric fans, but you can't buy air conditioners and electric fans combined." What’s even more surprising is that there were people who wanted to use air conditioning fans as cheap humidifiers.

　　Nowadays, there is also a mobile air conditioner with a compressor, which is essentially different from an air conditioner fan. It cannot be counted among the types of electric fans, and the price is usually relatively high.

　　5. Bladeless fan

　　The bladeless fan was originally invented by Dyson and got its name because it has no fan blades on the outside. In fact, there is a turbine blower below that sucks air into the hollow ring and supplies the air through the gaps set in the ring. The annular cross-section of the air multiplier adopts a shape similar to that of an aircraft wing, using the Coanda Effect and the same effect as the lift of the wing to increase the air volume. Due to patent issues, except for Dyson, only domestic copycat factories are currently making products. Most of the copycat factories have poor quality, high noise, and small air volume. If you want a better experience with a bladeless fan, it is recommended to choose the genuine Dyson fan, but the price is more expensive than low-end air conditioners, around 2,000 yuan.

　　Key points for purchasing fans

　　1. Number of fan blades

　　Taking into account the characteristics of rotation balance, the number of blades of general electric fans is odd. Even-numbered blades are prone to resonance when rotating, causing damage. Originally, electric fans were basically three-blade fans. In recent years, many five-blade fans have appeared. This is because the more blades the fan has, the more evenly cut the wind is and the softer it is. However, the more blades, the greater the load on the motor, so the number of fan blades cannot be too many.

　　2. Fan motor type

　　Most motors now use aluminum casings, and the internal coils use copper wires. The aluminum casing mainly has high heat dissipation efficiency. There are also some old-fashioned electric fans that use iron casings, but iron is heavier than aluminum and is not as good as aluminum in heat dissipation efficiency.

　　Although there are no obvious technical differences between motors of various brands, motors from big brands are definitely more secure. As long as the materials and workmanship are reliable, they can last for 10 years without any advanced technology.

　　3. Details that need to be paid attention to when purchasing and using

　　When purchasing an electric fan at a store, you should pay more attention to the heating problem of the motor. The hotter the motor is, the greater the internal loss is, or the heat dissipation capacity is poor. You also need to pay attention to whether the minimum windshield is small enough and whether the noise is acceptable. Whether it has a remote control function, the remote control can control the electric fan very conveniently. It is best to choose a model with a remote control for home use.

　　During use, be careful not to have any obstruction behind the fan. The fan needs to suck in air to generate airflow.

　　The warranty of the electric fan is one year, and problems often occur when used in the second year, so it is best to try to see if all functions are normal before the warranty period ends.