It is not 3 pieces or 5 pieces. Why do electric fan blades have to be single?

Review expert: Zhao Liangyu

Associate Professor of Flying Control Department, Beijing Institute of Technology

Although it has been established now, the hot climate in many places in the country has not weakened at all, but it has become more and more intense. "Summer is hot, there is a sweetness with you." When this familiar online hot language spread, it is definitely not only beautiful love, crispy watermelon, but also saving people to save people. "Electric Fan".

Source 丨 News Picture

As a family summer weapon, air conditioners have saved many workers in water and fire. In areas where the air conditioner fails to cover, the existence of electric fans brings a moment of coolness to countless people. So how does this simple and price -friendly electrical appliances bring "wind", and why is its leaves always single?

How is the electric fan blowing?

Regardless of the shape of the electric fan, high or short, or novel. The electric fans used in general families are composed of main components such as plugs, fan blades, motors and hoods. When people plug in and connect the power, the motor consumes power and transforms it into mechanical energy by turning, driving the fan blades of the electric fan to rotate quickly.

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The turning fan blades do not create wind, but brings a cool wind by driving the air flow to the people who are afraid of heat. This is because when the fan blades are rotating at a high speed, the flow of the surrounding air is accelerating, and wind is formed. The reason why people can feel cool in the "wind blowing" environment is because the wind will accelerate the evaporation of sweat on the surface of the human body.

Is the number of fan blades in the fan?

I do n’t know if you have observed the fan blades of the electric fan. In fact, their structure is not the imagination of the horse, nor is it a creative creation. Most of the fan blades of the electric fan have the same or similar shape: oblique, fan blades with a certain angle, and the number of fan blades is mainly 3, 5, and other units.

A qualified electric fan has a critical air volume, and this element is precisely determined by the space structure of the fan blades. After experiments, it is found that compared to the combination of 4 and 6 pieces of fan blades, the advantages of the combination of odd fan blades are more and more obvious.

Source 丨 pixabay

First of all, the stability of the odd number blades is stronger and avoid shaking at work. The occasional leaves have increased the difficulty of maintaining the balance of the electric fan itself, and it is also easy to cause resonance. When the leaves are frequently resonated, it may break due to the unbearable vibration energy. For manufacturers, the after -sales maintenance issues arise are also tricky.

Relatively speaking, this problem can avoid this problem. The arrangement of the leaves into asymmetry can effectively reduce noise and jitter.

Source 丨 pixabay

Secondly, the electric fan of the odd -digital blades is more environmentally friendly, and it is more in line with the public's expectations in terms of energy conservation and power saving. Taking the electric fan of 3 pieces of blades as an example, its structure can form a reasonable motivation in terms of mechanics. In other words, as long as there are two leaves in the state of potential energy, it can drive another blade that does not have power potential energy to rotate together to achieve power and energy saving.

Therefore, we can find that most of the fans used in the fans are 3 leaves. This design can ensure greater traffic and meet people's cooling needs; on the other hand The "skill" of electric fans. At the same time, the problem of noise and jitter has been avoided, and the loss of the bearings has been weakened and the service life is improved. Therefore, it is not only an electric fan, but also many blade mechanical systems. This design concept is used. For example, some propeller helicopters also have strange leaves.

Source 丨 News Picture

Of course, in actual life, the saying "fan leaves are all strange numbers" are not absolute. For example, the helicopter also has a propeller with 2 leaves and 4 leaves, and the small electric fan also uses 4 -leaf design. In the design of the product design, whether it is necessary to adopt the occlusal blades, it is more important to consider the actual situation of the body.

Is these new type of electric fans really effective?

In addition to the leaf electric fan, many new electric fans have also begun to enter millions of households in recent years. Among them, it is represented by leaf -free fan, tower fan gas flow fans and air -conditioning fans.

The leaf -free electric fan is the invention of British scientist James Dyson. Since the emergence of the first leaf -free fan fan on October 12, 2009, it has won the favor of the public with a novel and simple design. The design of no fan blades improves security and solves the hidden dangers of people (mainly young children) being injured by fan blades.

The leaf -free fan composed of a ring and a bracket base has become a weapon for many home environment to enhance the sense of technology and modernity with its simple and smooth lines. Leaf -free fan fan is not only valuable, but also very powerful. It can not only realize the functions of regulating pitch angles and remote controls of ordinary electric fans. At the same time, the principle of turbocharging is used to achieve "hair dryers".

Source 丨 News Picture

The shape of the tower fan is very characteristic. The fan is like its name, mostly cylindrical, and some can be as high as 1 meter. For urban families, this thin and long shape and design effectively saves space. At the same time, its narrow and long air outlet makes the "wind" more gentle, giving people a comfortable sense of natural wind. One is especially suitable for families with elderly and children. For market demand, many tower fans also add a aromatherapy box design, allowing the wind to have aroma, adding a romantic atmosphere.

Source 丨 a shopping website

The volume of the air -conditioning fan is the largest among these three new fans, but it is not equipped with a compressor like an air conditioner. Its function is similar to the tower fan, but it has the advantages of humidifying air with the advantages of humidifying air.The air -conditioning fan is equipped with an additional water tank and a air filtering net.Users can choose to add water or ice in the water tank. The built -in water pump makes the water continuously circulate in the machine, so that the surrounding air can cool down, and the air can be cooled while moisturizing the air.Although this kind of refrigeration method is relatively primitive and the air supply is relatively limited. It cannot be quickly cooling like air conditioning, but it is a good choice for the elderly and children who are weak and afraid of air conditioning diseases.

Source 丨 a shopping website

Sanfu has ended, but "Autumn Tiger" is still staring.Many areas in my country have entered a continuous high temperature day, and it is not necessary to ignore the heatstroke prevention and cooling work.The most earthy is the leaf -electric fan still brings coolness to countless busy people.However, remember not to blow the fan after strenuous exercise and a lot of sweating.

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