1. Determine the species
At present, there are various varieties of ceiling fans, table fans, floor fans, Hongyun fans, ceiling fans, wall fans and derivatives such as micro-ceiling fans, office fans, sofa fans, and multi-purpose fans on the market. Each type of fan has different specifications. Consumers should decide which fan to buy according to the purpose, usage environment and hobby.
2. Number of fan blades
Considering the characteristics of rotational balance, the number of blades of an electric fan is generally odd, and the even-numbered blades are prone to resonance when rotating, causing damage. Originally, electric fans were basically three-blade fans. In recent years, there have been many five-blade fans. This is because the more fans there are, the more uniform and softer the wind is to be cut, but the more fans there are, the greater the load on the motor. Large, so the number of fan blades should not be too much.
3. Fan motor
Compared with ordinary motors, the fan of DC variable frequency motor has more advantages in noise control, and DC variable frequency is more power-saving than AC variable frequency. A good motor not only rotates smoothly and is not easily damaged, but also has low noise. At the same time, pay attention to the lubricating oil in the motor when purchasing.
4. Function
The function selection mainly focuses on the desktop and floor fans. These two kinds of electric fans are generally divided into two types: standard popular type and electronic luxury type. The former is characterized by simple structure, convenient operation and low price, and generally only has two functions of speed regulation and reversing; the latter is characterized by complex and changeable functions and luxurious and exquisite shapes. Consumers can decide whether to take practicality as the premise or practicality, decoration and luxury as the purpose.
5. Quality
The paint and electroplating of high-quality electric fans are bright and smooth, without bubbles and scratches. There is no looseness of each screw. When the rotary shaft and switch are operated, the pronunciation is clear and the positioning is accurate, and the command of the touch switch is correct and reliable. When the fan blade is turned, the fan blade rotates smoothly and easily without touching any part, and when it stops, the blade gradually diffuses and stops naturally.
6. Noise problem
For humans, a volume below 45 decibels (DB) is more suitable for sleep, while above 50DB, there will be some obvious sounds, and above 65DB is equivalent to shouting. Many of today's fans produce loud noises. The fan noise can even be controlled at around 40DB.
About the three-blade or five-blade electric fan, the relevant knowledge about the precautions when purchasing an electric fan, I will introduce it to you here. If you are also troubled by the purchase of an electric fan, I hope the editor will summarize these Knowledge can help you.
