Rotary vane vacuum pump noise problem - how to solve

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 consists of the noise from the pump itself and the noise of the machine. To the user, it also focus on the startup phase noise pump when the temperature is not stable, running noise under different inlet pressure and gas ballast operation noise. So. Many factors should be considered.

rotary-vane vacuum water pump noise below

( 1) The rotor's influence on the cylinder block, the remaining volume of the pump and exhaust pressure oil in the area of voice to death.

( 2) The influence of the exhaust valve to the seat and frame.

( 3) The echo of the box and the bubble burst.

( 4) Bearing noise.

( 5) A lot of noise impact oil baffle plate of oil and gas.

( 6) The other. Such as transmission caused by noise, air cooling pump fan noise, etc.

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

rotary-vane vacuum water pump design and processing are as follows:

1. Rotary vane's influence on the cylinder wall

if the improper use of the design, manufacture or material in rotary vane sliding is not smooth, or because of dead gap, incompressible oil will lead to spin the opening department doesn't always run near the cylinder wall, this will lead to spin impacting on the cylinder wall. Therefore, appropriate USES separate import and export structure of arc surface. With the exhaust guide to eliminate dead zone. Using line separation structure, exhaust endpoint 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 rotary vane thickness, suggested take 7 ~ Lomm, great pump take great value. Due to turn as too close to the

if the sealing effect when the rotor to the tangent point position is not good, so the existence of the pair of rotor slot and the rotor head with only a narrow strip of contact will affect the pump speed, 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 rotary vane, rotary vane pumps to avoid and groove wear and tear, pay attention to the cold oil viscosity, design enough spiral spring force, when the arc surface is used to separate the additional eccentric rotor center value should 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, rather than the impact noise. In general, small pump is only 0. 20 ~ 0. 25 mm, and large pump can be appropriately increased.

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

size and location of the two volumes related to 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, the high jump, the valve area, the greater the valve plate, the greater the noise, the valve material has a certain influence. The noise of the rubber valve plate should be superior to steel or laminate. Therefore, we should control the input, and close the 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.

as a result, when gas open or open air, the noise will be increased significantly. If the ballast is adjustable, gas ballast can be reasonably adjusted.

4。 A large number of oil and gas emissions impact oil baffle plate and other parts of the noise.

if the rigid or no fastening parts is not enough, vibration and impact occurs, 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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