The advantages of the three blade roots vacuum pump have these three points, which are more outstanding than the two blade type!
The three blade roots vacuum pump adopts a three blade impeller. Its working principle is basically the same as the old two blade roots vacuum pump. Compared with the old roots vacuum pump, the three blade roots vacuum pump has the following characteristics:
1. Improve the volume efficiency of vacuum pump
The volume between the two blades on the impeller of Roots vacuum pump and the pump shell is called the working volume. Then, the working volume of Roots vacuum pump has the function of blocking the suction port and the exhaust port. The working volume of the two blade roots vacuum pump is only kept closed in a small angle range, and the blocking effect is not significant, while the working volume of the three blade roots vacuum pump has at least 60 ° closed rotation Process, blocking effect is significant. Therefore, the internal leakage flow of the three blade roots vacuum pump is smaller than that of the two blade roots vacuum pump under the same clearance and working conditions. In addition, due to the particularity of the three blade impeller, the base circle volume of the three blade roots vacuum pump is also slightly smaller than that of the two blade roots vacuum pump. Combined with the above factors, three blade roots vacuum pump has higher volume efficiency than two blade roots vacuum pump.
2. Small air flow pulsation, light vibration and low noise
The effective volume of Roots vacuum pump is changed from two to three, which can effectively reduce the pressure pulsation when the gas is discharged. In addition, for a three blade impeller, the internal leakage flow of gas from the exhaust side to the intake side through the impeller clearance is small, so the disturbance to the gas is small, and the pressure fluctuation is further reduced.
Compared with the two blade roots vacuum pump, the three blade roots vacuum pump has a smaller inter blade volume, which can reduce the holham resonance effect and the strong air impact caused by the gas countercurrent compression. Pressure pulsation and air impact are the main noise and vibration sources of Roots vacuum pump. Therefore, three leaf roots vacuum pump can effectively reduce noise and vibration.
3、 Improve the reliability and limit vacuum degree of vacuum pump
Due to the structural differences between the three blade impeller and the two blade impeller, the mechanical properties of the three blade rotor are generally better than that of the two blade rotor. In the case of the same impeller size and vacuum degree, the maximum force of the three blade rotor is about 80% of that of the two blade rotor, and the structural rigidity of the three blade rotor is better than that of the two blade rotor, so the three blade rotor has more advantages than the two blade rotor in ensuring the clearance between the impeller and the pump shell and between the impeller and the impeller.
In Roots vacuum pump, working clearance is one of the main structural parameters of the pump. Its size is very important to ensure the working performance. Therefore, compared with two leaves roots vacuum pump, Three Leaves Roots vacuum pump has higher reliability and limit vacuum degree.