Working principle and structure diagram of Roots vacuum pump:

The working principle of Roots vacuum pump is shown in the figure: in the pump chamber, two "8" shaped rotors are installed on a pair of parallel shafts vertically, and a pair of gear belts with a transmission ratio of 1 act to rotate synchronously in opposite directions. There is a certain clearance between the rotors and between the rotor and the inner wall of the pump casing, which can achieve high speed operation.

Because Roots vacuum pump is a vacuum pump without internal compression, and the compression ratio is usually very low, the front stage pump is required for high and medium vacuum pumps. The limiting vacuum of Roots vacuum pump depends not only on the pump structure and manufacturing accuracy, but also on the limiting vacuum of the previous stage pump. In order to improve the extreme vacuum of the pump, roots pump can be used in series. The working principle of Roots vacuum pump is similar to that of Roots blower.

Due to the continuous rotation of the rotor, the extracted gas is sucked into the space v0 between the rotor and the pump casing from the air inlet, and then discharged through the exhaust port. Since the v0 space is completely closed after suction, the gas in the pump cavity is not compressed and expanded. However, when the top of the rotor turns over the edge of the exhaust port and the v0 space is connected to the exhaust side, due to the high gas pressure on the exhaust side, a part of the gas rushes back into the space v0, causing a sudden increase in the gas pressure. When the rotor continues to rotate, the gas is discharged from the pump.

The figure shows the pumping process of Roots vacuum pump rotor from 0 ° to 180 °. At 0 ° position (a in the figure), the lower rotor is sealed with v0 volume gas from the pump inlet. When it is turned to the 45 ° position (b in the figure), the chamber is connected to the exhaust port. Due to the high pressure on the exhaust side, part of the gas rushes back. When it is turned to the 90 ° position (c in the figure), the gas sealed in the lower rotor is discharged out of the pump together with the back flushing gas. At this time, the upper rotor is also sealed with v0 volume gas from the pump inlet. When the rotor continues to turn to 135 ° (d in the figure), the gas in the upper rotor seal is connected to the exhaust port, and the above process is repeated. The 180 ° (Figure e) position is the same as the 0 ° position. Four v0 volume gases are discharged when the rotor main shaft rotates for one circle.

To sum up, its working principle is not simple, but it is very important to further understand its working principle. Users can choose products based on their working principles, and producers can improve the shortcomings of this product and enhance the competitiveness of products based on their working principles. In general, with the improvement of China's industrial level, how to improve the competitiveness of products is very necessary for the market share of products.