Temperature control cooling fan is a kind of intelligent fan, take our double ball bearing exhaust fan as an example, its built-in temperature sensing element, can automatically adjust the speed and rotation of the fan according to changes in ambient temperature. So, how exactly does this amazing temperature sensor work? Here is a brief introduction for you.

Temperature sensing elements usually use thermistors, thermocouples or thermistor capacitors and other devices. Taking a thermistor as an example, it is a resistance composed of a special material, and its resistance value changes with the increase or decrease of temperature. When the ambient temperature increases, the resistance value of the thermistor will decrease. When the ambient temperature decreases, the resistance value will increase.

When the temperature sensing element is placed in a key location of a c, such as a radiator or inside the case. When the ambient temperature rises and exceeds the preset temperature threshold, the temperature sensing element senses the temperature change and then transmits the signal to the fan control circuit.

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How to measure the noise of cooling fan? What are the main factors related to the noise generated by cooling fans? How should we reduce the noise of cooling fans?

1、How to measure the noise of cooling fan?

Noise is the sound level generated by the cooling fan during operation, and its unit is decibel (dB).

Quiet cooling fan, when measuring the noise of the cooling fan, it needs to be carried out in a Anechoic Chamber with noise less than 17dB, one meter away from the fan, and aligned with the air inlet of the fan along the direction of the rotating shaft of the cooling fan.

The spectral characteristics of the noise of the cooling fan are also very important, so it is necessary to record the noise frequency distribution of the cooling fan with a spectrometer. Generally, it is required that the noise of the cooling fan should be small and there should be no abnormal sound.

2、What are the main factors related to the noise generated by cooling fans?

The noise of high speed exhaust fan is related to friction and air flow. The higher the rotating speed and the larger the air volume of the cooling fan, the greater the noise will be.

In addition, if the fan bearing lacks lubricating oil or has too much dust, it will also cause fan noise, which needs to be maintained and cleaned in time, so as not to damage the hardware equipment due to blocked cooling.

3、How should we reduce the noise of cooling fans?

To solve this problem, we can try to use larger cooling fans. Under the condition of the same air volume, the working noise of the fan with large size at lower speed is smaller than that of the fan with small size at higher speed.

Another factor that we easily overlook is the bearing of the cooling fan.

Brushless motor fan, because the rotating shaft and bearing collide with each other when the cooling fan rotates at high speed, it is also a main source of noise of the cooling fan.

With the popularity of smart toilets, heat dissipation has become a key factor in the normal operation and extended service life of equipment. It is important to choose the right cooling fan, not only to consider the size, but also to choose the appropriate fan type according to the power and operating environment of the smart toilet, such as 5V blower, high speed exhaust fan, high quality mini axial flow cooling exhaust fan.

Size selection of smart toilet cooling fan

The internal space of the smart toilet is limited, so the size of the cooling fan is generally between 40mm and 70mm. Generally, 40mm x 40mm fans are suitable for compact design toilets, suitable for low power cooling needs. The 50mm x 50mm fan is a common general-purpose size, providing good air volume and low noise for moderate heat dissipation needs. If the power of the smart toilet is large, the 60mm or 70mm high-quality mini axial flow cooling exhaust fan can meet the large heat dissipation needs and provide a stronger cooling effect.

5V blower: The combination of miniaturization and efficient heat dissipation

Among smart toilets, 5V blowers are an ideal choice, especially for small or low-power toilet designs.

High speed exhaust fan: effectively respond to high heat dissipation requirements

For more powerful smart toilets, the high speed exhaust fan can quickly remove the heat inside the toilet. The high speed exhaust fan is widely used in most industrial toilets and is suitable for users who require high heat dissipation effect.

High quality Mini axial cooling exhaust fan: the perfect combination of silence and efficiency.The high quality mini axial flow cooling exhaust fan is favored by many smart toilet manufacturers because of its excellent cooling effect and silent performance.