Manufacture process design of rotary vane vacuum pump to reduce the noise. 2)

the noise of the rotary vane vacuum pump, usually in the measurement of the pump noise levels of temperature stability and resistance to vacuum. It includes the pump and motor noise, the noise itself, users, also pay attention to the temperature at which the pump is not noise, and according to the different inlet pressure at the start of the noise of the homework, when gas ballast noise and stable work. The case. Want to consider a variety of factors.
to point to the location of the voice, the pump noise has the following several possible areas:
( ） Rotary vane on the cylinder and the effect of the pump and exhaust pressure oil residues of the die gap can smell;
( ） The influence of the exhaust pneumatic seat and the support part of the piece;
( ） Cabinet echoes and foam crack;
( ） The noise of the bearing;
( ） A lot of gas, by blocking the oil plate, and other noise caused by the oil crisis;
( 6) The other. As a result of transmission of noise, air pump fan noise.
( ） Motor noise, it is a key factor.
recommended design scheme is as follows:
and compared. in the influence of the rotor blades.
if the design, manufacturing or improper use of the material is poor vane, or death due to exhaust gas gap, do not make oil screw opening will not always near the cylinder wall compression operation, will lead to the influence of the rotary vane in the voice of the cylinder wall. Therefore, points should be taken into the park and the vent arc structure. Exhaust diversion trench, to eliminate dead gap. Vent the distance line structure is introduced as possible, to rotary vane pump under L/s, considering the actual thickness vane cutting point short, recommend? LOmm, pumping larger value. Too close, due to the existence of the rotor blade and blade slot contact is only a narrow head, rotary vane seal cutting position, if not, it will affect the pumping speed of the pump, even limit the pressure. This structure can not completely eliminate exhaust visible die gap and limit the noise levels.
it should be noted that the rotor blades and presided over the conference slot to reduce the gap in performance. Therefore, in order to ensure that the appropriate forms to values of tolerance and position tolerance, pay attention to in the rotor blades, vane and thermal expansion slots, avoid scratches, pay attention to the cold oil viscosity oil rotary blade design of spring force is enough, when PiaoJieShao arc separation, the center of the rotor eccentricity extra value should not be too big. Otherwise, arc spiral slice through the two park, will produce from the trend of the fellowship in the wall, but the impact of the noise. Small pump is commonly. 吗? 。 Mm large pump can be appropriately increased.
exhaust pressure mold gap in the oil and residue oil pressure. The ultimate pressure of the pump, the two pressure oil will be connected with the vacuum chamber vacuum chamber, the high speed photography, rotor, cylinder wall crash. Two size, location, and noise on volume.
, aerodynamic noise and support the seat part of the
the gas volume, circulating pump more oil, greater noise, pneumatic valve, pneumatic valve is the high jump, pneumatic valve, noise also large pneumatic valve, pneumatic valve material also has certain influence. Rubber pneumatic valve should be higher than steel or laminate and noise. To this end, into the oil control, pneumatic valve shut down in a timely manner. Please pay attention to choosing and the structure of the pneumatic valve.
, echo ark and gas increases, the sound of the bubble burst, the noise will be increased. Therefore, when the gas through the atmosphere of the town or noise will be increased significantly. If the adjustable air volume, can adjust the volume of gas ballast appropriately.
when a pair of natural gas and oil to put panels and other components of a large number of oil blocks the effects of noise. If the rigid parts, or fastening, vibration and impact, lack can increase the noise. Therefore, there should be enough oil baffle plate is not only the rigidity and strengthen, and in other parts of the ( Such as tank) The need of contact, using rubber folder method, in order to avoid shock vibration caused by noise, improve oil block effect.