What are the working principles of the blower

With the continuous development of the fan industry, there are more and more types of fans. The blower is one of the most common types. It has the advantages of saving electric energy, reducing energy consumption, and saving production costs. Users have used, in addition to the blower itself can bring the most basic ventilation effect, the blower also surpasses other types of fans in all aspects. So what are the working principles of the blower fans ?
General blowers have the following working principles:
1. Working principle of rotary blower:
The rotary blower has an exquisite structure and generally consists of six parts: the motor, the air transition device, the blower body, the air chamber, the base (and the oil tank), and the drip nozzle. The blower runs eccentrically on the rotor offset in the cylinder, and changes the volume between the four blades in the rotor slot to suck in, compress, and discharge air. During the operation of the blower, the pressure difference is used to automatically send lubrication to the drip nozzle, drip into the cylinder to reduce friction and noise, and also to keep the gas in the cylinder from returning.
2. Working principle of centrifugal blower: 　
The blower usually has a high-speed rotating rotor. The high-speed movement of the air is driven by the blades on the rotor. The centrifugal force causes the air to flow in the involute-shaped casing along the involute to the fan outlet. The high-speed airflow has a certain Wind pressure. Fresh air enters and supplements from the center of the cabinet. In fact, the working principle of a centrifugal blower is similar to that of a centrifugal fan. The difference is that the air is compressed under the action of centrifugal force, usually through several working impellers.
Changing the performance curve of the fan itself or the characteristic curve of the external pipe network is the basic principle of blower adjustment. The operating point of the blower during operation not only depends on its own performance, but also on the characteristics of the system. When the pipe network resistance increases, the pipeline performance curve will become steeper.
3. Working principle of Roots blower:
Roots blower is a fixed volume blower, and the air volume delivered is proportional to the number of revolutions. Compared with the two-blade type, the three-blade type impeller uses two blades to inhale and exhaust three times each time. The gas pulsation becomes less and the load The change is small, the mechanical strength is high, the noise is low, and the vibration is also small.
Each impeller is always kept in the correct phase by the synchronous gear to avoid contact, so it can be high-speed, and the structure is simple, does not require internal lubrication, runs smoothly, and has stable performance. It is suitable for multiple purposes and has been used in a wide range of applications. field.