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The stator curve of a vacuum pump has a direct influence on its performance parameters such as pumping rate. Therefore, it is very important to obtain an excellent stator curve for the plan of vacuum pump. As for the stator curve of vacuum pump, there are the following appeals:

(1) Suitable two-point distance

Due to the integrated blade selection plan, the rigidity is enhanced, and the elasticity of one end must constitute the corresponding elasticity of the other end. So, no matter the rotor turns to an angle. It is necessary to ensure that the curves are in contact with both ends of the rotor. Adhere to reasonable clearance to prevent the increase of discharge due to void phenomenon.

(2) The blade has no impact vibration and excellent noise

The smooth stator curve can not have too large acceleration, too much acceleration will lead to the increase of pressing force on the surface of stator curve at one end of the rotor, which will increase the wear and noise. However, if the radial velocity 4) of a point on the stator curve changes, then the radial acceleration at that point will change. It's equal to infinity in theory. If a is infinite. At this point, the blade will appear a moment of separation, a great impact. Make up a big voice and serious grinding. In order to eliminate this phenomenon, the stator curve is requested to be smooth and continuous and smooth.

(3) The force of the rotating blade is excellent

The angle between the vector diameter of a point on the stator curve and the normal of the point on the curve is the pressure angle of the stator curve. The increase of pressure angle will increase the force of the stator against the vane and the angle between the vane direction, increase the lateral force of the vane, increase the conflict between the vane and the rotor, and worsen the stress condition of the blade, which will affect the service life and total power of the pump.

(4) There is a large pumping rate

In order to obtain higher pumping speed string, the volume area of vane pump element should be increased as much as possible without increasing the pump body standard.

The new stator curve should also have the velocity and acceleration characteristics of the existing curve as well as increasing the pumping rate. Now, the stator curve of vacuum pump is mainly circular curve. It is mainly considered that the positive return curve has excellent speed and acceleration characteristics, which reduces the noise and impact during the operation of vacuum pump.