Rotary vane vacuum pump running in the process of how to reduce the noise? - - - - - -

rotary vane vacuum pump noise is usually refers to when temperature stability of the pump, the measured noise level under the limit of vacuum. It includes the noise from the pump itself and the noise of the machine. For users, it also pay attention to the start of the rotary-vane vacuum pump when the temperature is not stable phase noise, operating noise under different inlet pressure and gas ballast operation noise. As a result, many factors should be considered.

according to the location of the sound, the noise of the rotary-vane vacuum pump can be divided into the following several aspects:

( 1) Rotor on the impact of the cylinder block, the remaining volume of the pump and exhaust pressure oil voice of dead zone.

( 2) The impact of the exhaust valve to the seat and frame;

( 3) The echo in the cabinet and bubble burst;

( 4) Bearing noise;

( 5) A large number of oil and gas oil baffle plate impact noise;

( 6) The other. Such as noise, air cooling water pump fan noise, etc.

( 7) Motor noise, it is a key factor.

the rotary-vane vacuum water pump design and treatment scheme are as follows:

1. Rotary surface of the cylinder wall effects

if improper use of the design, manufacture or material causes the rotor plate sliding is not smooth, or because of dead gap, incompressible oil lead to the rotor plate head doesn't always close to the cylinder wall, this will lead to the rotor plate impact cylinder wall. Therefore, using the circular arc surface separation of import and export structure is appropriate. With the exhaust guide to eliminate dead zone. Using line separation structure, the exhaust end point should as far as possible, shorten the distance to the point of tangency. For the rotary vane pump under 70 l/s, considering the actual thickness of rotating impeller, suggested take 7 ~ Lomm, great pump take great value. When its close, due to the existence of the rotor rotor slot and only a narrow strip in contact with the rotor head, once the rotor rotation to the point of tangency, sealing effect is bad, this will affect the pumping speed and even the ultimate pressure of the pump. As you can see, this structure can not completely eliminate exhaust dead zone, limit the noise level.

should point out that the gap between rotor and slot will degrade performance. Must make the pledge that we shall, therefore, reasonable tolerance matching, form and position tolerance value, pay attention to the thermal expansion of the rotor plate, avoid between the rotor plate and tank bruises, pay attention to the cold oil viscosity, oil design enough rotor plate spring force. Using arc surface separation, the additional eccentric rotor center value shoulds not be too big. Otherwise, when the rotor through the two circular arc, it will tend to be in the intersection point from the cylinder wall, thus impact noise. In general, small pump only 0. 20 ~ 0. 25 mm, and the big pump can be appropriately increased.

the exhaust pressure oil and residual volume of dead zone of pressure oil to produce sound. When it comes to an extreme pressure pump, oil pressure of two connected to the vacuum chamber when high speed spray into the vacuum chamber, and collisions with the rotor and cylinder wall sound.

the two volume size and location is associated with noise.

2。 Valve surface seat and support the impact of noise

the greater the amount of gas suction, the greater the of oil in the circulation pump, valve plate, the greater the noise valve jump higher, and the valve area, the greater the noise, the greater the valve plate valve plate material also has certain influence. The noise of the rubber valve plate should be superior to steel or laminate. Therefore, we should control the input, and tight shutoff valve plate in a timely manner. Pay attention to the material selection and structure of the valve.

3。 When the box in the echo and the volume of the bubbles burst increases, the noise will be increased. Therefore, when gas open or open air, the noise will be increased significantly. If the gas ballast is adjustable, so the gas ballast can be reasonably adjusted.

4, a large number of oil and gas discharge impact oil baffle plate and other parts of the noise. If the parts or not tighten enough rigidity, vibration and impact will happen, it will add noise. Oil baffle plate, therefore, not only should have enough stiffness and tightness, to avoid collision vibration caused by noise, and improve the oil baffle plate and other components ( Such as tank) The effect of the contact.

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