Introduction to the principle and working process of Roots blower

Working process of Roots blower: an article will let you know more about Roots blower!

This paper lists the principle and working process of roots blower, the air flow calculation method of roots blower, the classification of roots blower, the main characteristics of roots blower, the application scope of roots blower, the basic structure of roots blower, the installation and precautions of roots blower, and the application and use of roots blower.

Principle and working process of Roots blower

Roots blower is a type of fan, and the delivery air volume is proportional to the speed. Rotate 2 impellers each time, and one impeller sucks and exhausts once. There is always a small gap between the impeller on the shaft of fan 2 and the surface of the inner hole of the elliptical housing, between the end face of the impeller and the front and rear end covers of the fan, and between the impeller of the fan, which is transported from the air inlet of the fan to the discharge side along the inner wall of the lower housing driven by the synchronous gear. The inner wall of the fan does not need grease. It has compact structure, stable operation, stable quality, and can be used for many purposes. It has been widely used in various fields. As the core component of fan, the development trend of impeller rotor determines the development of fan to some extent. The dimensional accuracy of fan rotor is directly related to the performance of fan; The difference of the fan rotor machining center is directly related to the service life of the fan; The machining surface quality and rotor contour surface of fan rotor are directly related to the working noise of fan.

Its working principle is a rotating compressor, which compresses and transports gas by using the relative speed of two or three leaf rotors in the cylinder. Its working principle is as follows:

Calculation method of Roots blower air volume

The theoretical air volume of Roots blower is

, where

This is the area where the rotor is surrounded by the inner wall of the shell in the vertical position, similar to the area described by the rotor motion

/1/3 of 4,

　　=l/3

　　/4=

　　/12。 Therefore, the theoretical component is

　　=4

　　)/12=1/3

Since there is a gap between the rotor and the rotor, or between the rotor and the shell, the gas will leak back to the air inlet side, so the actual air flow is less than the theoretical air flow, that is

D - diameter of lumbar rotor. That is, the distance between the two end points of the rotor, mm;

L -- length of lumbar rotor, mm;

N - rotor speed, rpm;

——Volumetric efficiency, general

　　=0.75-0.85。

From the theoretical analysis, as long as the motor can drive and drive, the blower can work under pressure. However, if the pressure difference between the vent and the air inlet is too large, a large amount of gas will leak back to the inlet through the gap, reducing the efficiency of roots blower; At the same time, high speed may also cause machine vibration, reducing service life, so the vent pressure should not be too high. The negative pressure of domestic roots blower is 19620~Pa, and the air volume is between 0.25-250 m3/min (under the standard state). The general speed is 580.730.960 and 1450 r/pm. Take the inlet and outlet section of the blower and list the equation containing the mechanical energy of roots blower to obtain the equation related to the gas thermal process.

Classification of Roots blower

Due to different working modes, Roots blower (vacuum pump) has single pole and double pole, dry test and wet test.

(1) Unipolar and bipolar. A compressor blower (vacuum pump) is called a unipolar blower (vacuum pump). Connect two unipolar blowers (vacuum pumps) to compress air twice in a row, that is, bipolar blowers (vacuum pumps).

(2) Drying test and wet test. The blower generally carries out dry and wet transportation, and the vacuum pump has two conditions: dry and wet. The so-called wet vacuum pump is to inject a small amount of water into the shell from the pump inlet, mix the water with the gas, absorb the heat generated in the gas compression process, and seal the internal gap of the shell with water to reduce the leakage of gas through the gap. Therefore, the injected water is called both cooling water and sealing water.

In addition, there are also the following classification methods: according to the total number of impeller heads, there are two blade blowers and three blade blowers. According to the seal type, there are labyrinth seals, ball seals, and various types of blowers, such as rotary seals and mechanical seals. According to the cooling mode, there are air cooling blower, water cooling blower and counter current cooling blower. There are vertical blowers according to the structure type Vertical blowers, vertical shaft blowers, dense forming fans, etc. According to the transmission mode, there are direct connected blowers, belt blowers, etc. According to the type of medium, there are gas blowers, gas blowers, radon blowers, sulfur dioxide blowers, etc. It can also be divided according to the use, such as shaft kiln blower, gasification blower, aeration blower, etc.