The noise of a rotary vane vacuum pump usually refers to the noise level measured by the pump under extreme vacuum when the temperature is stable.
It contains the noise of the pump itself and the noise of the motor. For the user, it also cares about the noise during the start-up phase when the pump temperature is not stable and the noise at different inlet pressures, and the noise during operation in the open air town. thus. Consider multiple factors of influence.
There are several possible aspects of the pump's noise:
(1) the impact of the rotary vane on the cylinder body, the sound of the pressure oil in the remaining volume of the pump and the dead space of the exhaust gas;
(2) Impact of the exhaust valve on the valve seat and the support;
(3) Echoes and bubble bursts in the cabinet;
(4) Bearing noise;
(5) Noise caused by a lot of gas and oil impact shields;
(6) Others. Such as noise caused by the drive, air-cooled pump fan noise.
(7) Motor noise, which is a crucial factor.
The planning and treatment plan claims are as follows:
1, the rotary plate hit the cylinder wall.
If the planning, production, or improper use of materials causes slides to slip, or because there is dead space in the exhaust, non-condensing oil will cause the rotor head not to stick to the cylinder wall all the time, causing the rotor to face the cylinder wall. Hit sound. Therefore, it is preferable to use a structure in which the arc is partitioned into the exhaust port. Use the exhaust diversion groove to eliminate dead space. In the selection of the line separation structure, the distance from the exhaust end point to the tangent point should be shortened as much as possible. Regarding the rotary vane pump below 70L/s, considering the practical thickness of the rotary vane, it is advisable to take 7～10mm, and the large pump takes a large value. When it is too close, because of the turn
The existence of the sub-rotary slot and the rotary head only have one narrow-band touch. Once the rotary vane is turned to the tangential position, the sealing effect will be insufficient, which will affect the pumping speed and even the ultimate pressure. It can be seen that this structure does not completely eliminate exhaust dead space and restricts the level of noise reduction.
The demand points out that the clearance between the rotary vane and the groove exceeds the general fall function. Therefore, to ensure reasonable public service cooperation and form-position public service value, pay attention to the thermal expansion of the rotary vane, prevent the rotation of the rotary vane and groove, pay attention to the oil's cold oil viscosity, and plan to meet the rotary spring force of the rotary vane. When separating, the additional partial pain in the center of the rotor should not be too large. Otherwise, if the rotary vane passes through two arcs, there will be a tendency to break away from the cylinder wall at the intersection point, instead causing a collision noise. General small pump is 0.20 ~ 0.25mm can be large pumps can be properly increased.
The pressure oil in the dead-end of the exhaust and the pressure oil in the remaining volume sound. When the pump reaches the limit pressure, the two pressure oils will shoot at a high speed toward the vacuum chamber when they are connected with the vacuum chamber, hitting sound with the rotor and the cylinder wall.
The size and orientation of the two volumes are related to noise.
2. Impact noise of the valve seat against the valve seat and the support member
The amount of gas sucked in is large, the amount of circulating oil of the pump is large, the noise of the valve piece is larger, the valve jumps high, the area of ​​the valve is large, the noise of the valve piece is also large, and the material of the valve plate also has a certain influence. Rubber sheet noise should be better than steel sheets or laminates. For this reason, to control the amount of oil to be injected, the valve must be closed in a timely manner. Pay attention to the selection and structure of the valve.
3. When the amount of sound and air bubbles in the cabinet is increased, the noise will increase. Therefore, this noise will increase significantly when the town is opened or when it is open to the atmosphere. If the gas volume is adjustable, the amount of gas can be adjusted properly.
4. The noise declared by many gases and oils when they impact parts such as oil baffles. If the parts lack rigidity or are not tightened, oscillations and bumps will occur, which will increase the noise. Therefore, the oil baffle should not only satisfy the rigidity and be fastened, but also, when it needs to be touched with other parts (such as a fuel tank), the clamped rubber method can prevent the knocking noise caused by the oscillation and improve the oil blocking effect.
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