Why does an electric fan have three leaves?

This involves the functional loss of the motor, the angle and speed of the blades, the symmetry of the blades, the strength of the material, the weight of the blade, the fluid velocity, etc. The more blades, the greater the resistance and the less the velocity. The wider the blade, the greater the resistance and the lower the velocity.

Electric fan: It should be to fan the blades to stand at all angles, the speed is generally required, the blades can not be too many, and the three pieces are more beautiful. And the turning point of the fan is moderate in speed and power.

: The blades are required to be light, and the power generated is large, so the blades are narrow, the number is small, the declination angle is small, but the speed is fast. And the turnaround of *** is speed-based.

CPU cooling fan: It requires strong air circulation pressure, so it uses many blades and large blade declination angles. And its turnaround is power-based.

Due to the fact that it involves the rotational speed to power ratio and the like (when the declination angle, number, and face width of the blades reach a value, the maximum work is done on the air. )

The use of more than three fan blades is beneficial for maintaining the balance of the fan. Most of the three blades are used because they are already able to generate fan air, as long as the appropriate slope is adjusted to achieve the best effect, and the material can be saved than more fan blades.

I want an electric fan blade to change.

The number of blades of axial fans is often odd, because if an even number of symmetrical blades are used, and the balance is not adjusted, it is easy to resonate the system, and if the blade material can not resist the fatigue caused by vibration, the blades or mandrel will be broken, so it is mostly designed as an odd-numbered fan blade design with asymmetry of the axis. This principle is commonly applied to a wide range of fan blade designs, including some *** propellers.

The electric fans used in the family are all 3 blades, the blade shape is bird airfoil (design term), this form of blades has a large flow rate, low noise, in line with the principle of fluid mechanics, and the electric fan made of it is suitable for home use. So the vast majority of electric fans are three-bladed.

In addition, the three blades have a good dynamic balance and are not easy to oscillate, thereby reducing the wear of the bearing, prolonging the service life and reducing the maintenance cost.

Household fans a few decades ago, whether they were ceiling fans or table fans, were mostly 4-blade, which can be seen from movies and TV series. It's hard to see anymore.

Summary. Judging from the air supply effect alone, the use of five-leaf fan is the best.

The following is an introduction to the common three-blade, four-blade and five-blade fans on the market

1. Three-leaf fan.

1. Under normal circumstances, the blades of an electric fan are three, because the triangle is the most stable.

2. From the perspective of mechanics, the three-blade fan can save electricity and energy.

3. It is because the appearance of the three-bladed fan is more beautiful, and the cost is moderate, and the excessive number of blades will increase the cost of the product.

Generally, the fan blades of electric fans are odd-numbered blades, while electric fans with even-numbered blades are prone to resonance when rotating, causing damage, so four-blade fans are generally not chosen.

Three, five-leaf fan.

Generally speaking, the more blades an electric fan has, the better its air supply effect. Although it will increase the load, the more fan blades, the smaller the "wind" can be cut, so that the wind blowing out is softer and the silence effect is better. If you don't consider the manufacturing cost and energy consumption, the five-blade fan is the most ideal fan.

An electric fan is good with a few blades.

Judging from the air supply effect alone, the use of five-leaf fan is the best. The following is an introduction to the common three-blade fan, four-blade fan and five-blade fan on the market: 1. Three-blade fan 1, under normal circumstances, the fan blades of electric fans are three-blade, because the triangle is the most stable.

2. From the perspective of mechanics, the three-blade fan can save electricity and energy. 3. Because the appearance of the three-bladed fan is more beautiful, the cost is also moderate, and too many blades will increase the cost of the product. Generally speaking, the more blades of the electric fan, the better the air supply effect.

Although it will increase the load, the more fan blades, the smaller the "wind" can be cut, so that the wind blowing out is softer and the silence effect is better. If you don't consider the manufacturing cost and energy consumption, the five-blade fan is the most ideal fan.

I thought I would ask, my Wuling Light cooling fan is five leaves, and now there are four leaves on the market, can there be no five pieces.

OK. It won't affect the heat dissipation effect.

Four or five tablets are the same, right?

No, it's almost the same.

Okay, thank you, teacher.

Polite. Trouble to give a five-star.

Under the same conditions, the more blades, the greater the resistance, the slower the speed, and the smaller the wind, the advantage is that the stability is good, and the fewer blades is the opposite.

Therefore, the best effect of the use of electric fans with specific blades is to be analyzed by browning.

Under normal circumstances, the blades of an electric fan are three. There are three main reasons:

First, the triangle has stability and is three-legged;

The second is related to energy, from a mechanical point of view. 3 fans can form an asymmetrical reasonable mechanical power, when 1 blade does not have the power potential energy, the other 2 are in the state of potential energy, 2 potential energy blades can naturally easily drive a blade that does not have potential energy temporarily, which can save electricity and energy.

Third, because the appearance of the three-bladed fan is more beautiful, the cost is also moderate, and too many blades will increase the cost of the product.

Considering the characteristics of rotation balance, the fan blades of the general electric fan are all odd-numbered blades, while the electric fan with even number of blades is easy to resonate when rotating, causing damage.

1. Mechanical considerations3 blades mechanicallyThe most stableIt is not easy to deviate from the axis, tooMaintain a large air intake

2. Consideration of energy saving, againSignificant energy savings and power savings, so later fans are all 3 blades.

Three leaves haveBetter dynamic balance, not easy to produce oscillations, thusReduces bearing wear。Extend service life and reduce maintenance costs.

How it works. The working principle of the electric fan is that the energized coil in the AC motor is rotated by the force in the magnetic field, which converts the electrical energy into mechanical energy, and at the same time, due to the resistance of the coil, it causes part of the electrical energy to be converted into heat energy.

When the electric fan is working, the temperature in the room not only does not decrease, but rises. The reason is that when the electric fan is working, there is an electric current passing through the coil of the electric fan, and the wire is resistive, so heat will be generated to increase the surrounding temperature. However, the electric fan makes the surrounding air flow, which causes the sweat secreted by ** to evaporate, take away the heat in the body, and achieve the purpose of cooling the body.