Roots vacuum pump working principle

Since the Roots vacuum pump has selective pumping, sometimes a pump cannot meet the pumping requirements, and several pumps need to be combined to complement each other to meet the pumping requirements. For example, a titanium sublimation pump has a high pumping speed for hydrogen, but it cannot be pumped, and a three-pole sputter ion pump (or a two-stage asymmetric cathode sputtering ion pump) has a certain pumping speed for argon. When it is put up, the vacuum device will get a good vacuum.roots vacuum pump manufacturer

In addition, some vacuum pumps can't work under atmospheric pressure, and need pre-vacuum; some Roots vacuum pump outlet pressure is lower than atmospheric pressure, and the foreline pump is needed, so it is necessary to combine the pumps. Understand the composition of the gas to be pumped, the gas contains no condensable vapor, with or without particle dust, and whether it is corrosive. When selecting a vacuum pump, you need to know the gas composition and select the appropriate pump for the pumped gas. If the gas contains steam, particles, and corrosive gases, consider installing auxiliary equipment such as condensers, dust collectors, etc. on the inlet piping of the pump. Avoid operating near maximum vacuum or maximum exhaust pressure.

Operating in this area is not only extremely inefficient but also unstable and prone to vibration and noise. For vacuum pumps with a high degree of vacuum, cavitation often occurs in this area, and the obvious sign of this phenomenon is noise and vibration in the pump. Cavitation can cause damage to parts such as the pump body and impeller, making it inoperable. According to the above principle, when the vacuum or gas pressure required by the pump is not high, it can be selected firstly in the single-stage pump.industrial liquid ring vacuum pump introduce

If the vacuum or exhaust pressure is high, the single-stage pump is often not satisfied, or the pump is required to have a large volume under the condition of higher vacuum, that is, the performance curve is required to be flat at a higher vacuum, and two stages are available. Pump. If the vacuum is required to be above -710 mmHg, an optional water ring-atmosphere pump or a water ring-Roots vacuum unit is used as the vacuuming device. Large pumping speed in a wide range of pressure; quick start, can work immediately; insensitive to dust and water vapor contained in the pumped gas; rotor does not have to be lubricated, no oil in the pump chamber; Good balance conditions, no exhaust valve; low drive power, low mechanical friction loss; compact structure, small footprint; low operating and maintenance costs.roots liquid ring vacuum pump unit

Therefore, Roots vacuum pumps are widely used in the metallurgical, petrochemical, paper, food, and electronics industries. The Roots vacuum pump works like a Roots blower. Due to the continuous rotation of the rotor, the pumped gas is sucked from the intake port into the space v0 between the rotor and the pump casing, and then discharged through the exhaust port. Since the v0 space is fully closed after inhalation, the gas is not compressed and expanded in the pump chamber. However, when the top of the rotor turns over the edge of the exhaust port and the v0 space communicates with the exhaust side, since the gas pressure on the exhaust side is high, a part of the gas is returned to the space v0, so that the gas pressure suddenly increases. When the rotor continues to rotate, the gas exits the pump.vacuum pump connection