5 unknowable knowledge of Roots pump cooling: why is Roots pump called Roots pump?

Origin of Roots Pump Name

“Roots” is a transliteration of English Roots. It is named after the Roots brothers of the United States, the first users of Roots principle. In fact, the design principle of Roots pump was invented by Saiya Davis in 1848, but it was not implemented by Francis and Philande, the American Roots brothers, until 1868, 20 years later

Application History of Roots Principle

At first, the pump was used as the blower of the internal combustion engine; Later, the Roots principle was applied to the gas meter through the reverse drive device. It was not until 1954 that this principle was applied to the field of vacuum pumps.

Structural characteristics

Roots vacuum pump is a rotary positive displacement pump, in which two symmetrical impellers rotate close to each other in the pump housing. The cross sections of the two rotors are similar to the shape of the number 8 and are synchronized by the tooth gear. The clearance between the rotor and the shell wall and between the rotor itself is very small (as small as a few tenths of a millimeter). Therefore, Roots pump can run at high speed without causing mechanical wear.

Why not use alone

Roots pump is a vacuum pump without internal compression. Generally, the compression ratio is very low, so it cannot be used alone. Medium and high vacuum pumps need to use the front pump to cooperate. Generally, roots pump cannot be started under normal pressure. If it is started directly, the motor power will be very high, which will harm the vacuum pump. The presence of the front stage pump (such as rotary vane pump) can help the main pump roots pump to start smoothly and operate continuously.

Roots pump has no vacuum

There is no vacuum for a single Roots pump, which is just a mechanical booster pump. It can be used only when it forms a vacuum unit with the front pump. Only when it is used together with the front stage pump, can the Roots pump give better play to its performance. Roots pump can be used in combination with rotary vane pump or dry pump to expand the working range to medium vacuum range; The use of two-stage roots pump can be extended to the high vacuum range.

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