When should you use a scroll vacuum pump

scroll vacuum pump is used for cleaning and drying vacuum pump. Therefore, they are widely used in research fields and laboratories.

scroll vacuum pump uses two spiral vortex to pump and compress liquid or gas medium. One of the spirals is fixed and the other is eccentric. It is this eccentric movement that makes the gas compress.

scroll vacuum pump is quiet, compact and does not need oil. The airtightness of vacuum pump is produced by joint screw. Since seals must be replaced frequently to ensure optimum tightness, regular maintenance is required. The main disadvantage of these pumps is that they are easy to damage debris and introduced particles, which are easy to corrode the spiral seal.

Among the existing oil-free vacuum pumps, the oil-free scroll vacuum pump has the following characteristics compared with other types of oil-free vacuum pumps:

① No oil, no friction – no oil, no contact, no wear, no particle dust pollution in the vacuum chamber, a clean vacuum can be obtained;

② Large pumping capacity – double scroll, double pumping capacity of the same diameter compared with single stage, saving energy;

③ . high air extraction efficiency – with 3-4 air extraction units, small pressure difference; sealed by O-ring between atmosphere and vacuum, low leakage;

④ . non contact, good balance, small torque effect, low noise, small vibration;

⑤ It has simple and compact structure, small moving radius and stable operation under the same size;

⑥ . small size, convenient maintenance and low maintenance cost;

⑦ . air cooling without water cooling.

oil free scroll vacuum pump application:

① Semiconductor industry – film preparation equipment, semiconductor device packaging equipment;

② . scientific instrument industry – synchrotron radiation beam line, electron microscope, analysis and test instrument;

③ . mechanical equipment industry – material preparation equipment, vacuum detection, material purification equipment;

④ . chemical industry;

⑤ . medical equipment – dental instruments, dialysis machines, biological products and drug preparation;

⑥ . packaging industry – packaging equipment for food, medicine, biological products, etc.

The oil-free scroll vacuum pump is mainly composed of 5 parts:

① . the dynamic and static scroll is attached to the base;

② . crankshaft;

③ . gasket;

④ . anti rotation mechanism;

⑤ . motor.

The scroll of oil-free scroll vacuum pump is a scroll like structure formed by one or several involute helices connected with a plane at one end. A static scroll plate and a dynamic scroll plate are mutually crossed and assembled, and the anti rotation mechanism guarantees 180 between them. In this way, the basic pumping mechanism of oil-free scroll vacuum pump is composed of a pair of scroll pairs. The static scroll and the dynamic scroll contact each other in several straight lines (i.e. several points on the cross-section scroll line) to form symmetrical pairs of crescent cavities. The dynamic scroll moves around the center of the scroll body of the static scroll driven by the crankshaft, so that the contact points of the static scroll and the dynamic scroll move along the scroll surface to achieve suction, compression and exhaust. For example, in a two-stage oil-free scroll vacuum pump, there are two static scroll plates corresponding to the two directions, and one moving scroll plate located between the two scroll plates. The dynamic and static vortices move relative to each other to form a crescent shaped real cavity with constant volume change, which makes the gas aspirated from the suction port and discharged from the exhaust port, completing the cycle of suction, compression and exhaust. Every revolution of the crankshaft, a new set of crescent cavity is formed, so the suction, compression and exhaust cycles of the oil-free scroll vacuum pump are continuously repeated at the frequency of nearly 1500 rpm, forming containment and forced delivery of the extracted gas.

As we all know, the oil-free scroll vacuum pump has remarkable characteristics compared with the ordinary oil vacuum pump.

The main advantages of oil-free scroll vacuum pump include:

1. Good sealing performance, not directly connected to the leakage channel of suction and exhaust chamber like mechanical pump, easy to seal, easy to achieve high vacuum;

2. The rotating radius is small, the relative sliding speed of the dynamic and static scroll is only about 1 / 7 of that of the vane vacuum pump, and the dynamic seal between the dynamic and static scroll is relatively easy, which is conducive to extending the service life of the pump;

3. The compression process must be slow. There are two or three compression processes at the same time. The compression cavity is symmetrical with respect to the crankshaft. In this way, the operation process of the pump is stable, the driving torque and gas impact fluctuation are small, and the noise and vibration of the pump are reduced.

All in all, the oil-free scroll vacuum pump has a simple structure, a high compression ratio, a stable pumping speed in a wide pressure range, and a wide working pressure range; the gap between the dynamic and static scroll plates is small and the leakage is small, because the change of the volume of the compression chamber is continuous, the change of driving torque is small, the change of power is small, the vibration noise is low, and the performance is high. This is not available for other types of dry vacuum pumps.