What is the noise of the pump and the old noise of the pump? How to solve the problem of pump noise There are several possible aspects of pump noise: (1) the impact of the rotary vane on the cylinder, the residual volume of the pump and the sound of the pressure oil in the exhaust dead space; (2) the impact of the exhaust valve plate on the valve seat and the support member; (3) The echo and bubble bursting sound inside the box; (4) bearing noise; (5) Noise caused by a large amount of gas and oil impacting the oil deflector; (7) Motor noise, which is a crucial factor. The description is as follows: 1) Impact of the rotary vane on the cylinder wall. If the design, manufacture or improper use of materials causes the slide to slip poorly, or because of the exhaust dead space, the incompressible oil causes the rotary head to not always close to the cylinder wall, which will cause the rotary vane to the cylinder wall. The impact sounded. Therefore, it is preferable to use a circular arc surface to separate the structure of the intake and exhaust ports. Use the exhaust guide to eliminate dead space. When using the line separation structure, the distance from the exhaust end point to the tangent point should be shortened as much as possible. For the rotary vane pump below 70 L/s, considering the actual thickness of the rotary vane, it is recommended to take 7 to 10 mm, and the large pump takes a large value. When it is too close, due to the existence of the rotor vane groove and only one strip contact of the rotary vane head, once the rotary vane is turned to the tangent point position, the sealing effect is not good, which will affect the pumping speed and even the ultimate pressure of the pump. It can be seen that this structure can not completely eliminate the exhaust dead space, which limits the level of noise reduction. The pressure oil in the exhaust dead space and the sound of the pressure oil in the residual volume. When the pump reaches the limit pressure, the two pressure oils will be directed to the vacuum chamber at high speed when they are connected to the vacuum chamber, and the sound is struck against the rotor and the cylinder wall. The size and position of the two volumes are related to noise. 2) Impact noise of the valve plate on the valve seat and the support member The amount of gas to be inhaled is large, the amount of circulating oil of the pump is large, the noise of the valve plate 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 diaphragms should have better noise than steel sheets or laminates. To this end, to control the amount of oil, the valve should be closed in a timely manner, to be strict. Pay attention to the selection and structure of the valve. 3) This noise will increase when the echo and bubble burst in the tank increase. Therefore, this noise will increase significantly when the gas is opened or when the atmosphere is passed. If the gas ballast capacity is adjustable, the gas ballast amount can be adjusted reasonably. 4) Noise generated when a large amount of gas and oil are discharged while impacting components such as the oil baffle. If the part is not rigid enough or is not tightened, vibration and collision will increase the noise. Therefore, the oil baffle should not only have sufficient rigidity and tightness, but also, when it is required to contact other parts (such as the fuel tank), the rubber can be used to avoid the collision noise caused by vibration and improve the oil retaining effect. A vacuum pump that sucks, compresses, and discharges gas, such as a reciprocating vacuum pump, a rotary vane vacuum pump, a spool vacuum pump, and a Roots vacuum pump, causes noise to a large extent from the wear of the piston. Avoid running the vacuum pump near maximum vacuum or maximum exhaust pressure. Operating in this area is not only extremely inefficient, but also unstable and prone to vibration and noise. For vacuum pumps with a high degree of vacuum, cavitation often occurs in this area, and the obvious sign of this phenomenon is noise and vibration in the pump. Cavitation can cause damage to parts such as the pump body and impeller, so that the pump cannot work. According to the above principle, when the vacuum or gas pressure required by the pump is not high, it can be selected firstly in the single-stage pump. If the degree of vacuum or exhaust pressure is high, the single-stage pump is often unable to meet, or the pump is required to have a large volume at a higher vacuum, that is, the performance curve is required to be flat at a higher vacuum, and two are optional. Stage pump. If the vacuum is required to be above -710 mmHg, an optional water ring-atmosphere pump or a water ring-Roots vacuum unit is used as the vacuuming device. In addition, an oil-free scroll vacuum pump can be used to reduce noise. The compression process is relatively slow, and two or three compression processes are performed at the same time. The compression chamber is symmetrical with respect to the crankshaft, so that the pump operates smoothly, the driving torque and the gas shock fluctuation are small, and the noise and vibration of the pump are reduced. 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(6) Others. Such as noise caused by the transmission, fan noise of the air-cooled pump, etc.
It should be pointed out that the gap between the rotary vane and the groove is too large to reduce the performance. Therefore, to ensure reasonable tolerance and shape tolerance values, pay attention to the thermal expansion of the rotary vane, avoid the rotation of the rotary vane and the groove, pay attention to the oil viscosity of the oil, design enough rotary vane spring force, when using the circular arc surface separation The additional eccentricity of the rotor center should not be too large. Otherwise, the rotating piece passes through two circular arcs, which will produce a tendency to break away from the cylinder wall at the intersection, and instead cause impact noise. Generally, the small pump can be 0.20~0.25mm, and the large pump can be appropriately increased.
Anlet Roche vacuum pump can be widely used in vacuum drying, food vacuum packaging, solvent gas recovery, carbon dioxide gas recovery, vacuum forming, vacuum concentration, vacuum defoaming, central vacuum system, vacuum heat treatment and so on. 