A spiral vacuum pump is a voluminous mechanical device operating on the principle of internal compression. The movement of a gaseous mixture in such a device is carried out due to the fact that the volume of special cavities made in the form of a sickle changes. One of them is motionless, the second – carries out orbital movement.
A distinctive feature of this equipment is that it is not necessary to use any vacuum oils for its operation. The device has a chemically stable coating. This guarantees the possibility of their operation in the process of pumping active gaseous mixtures.
Advantages
Among the main advantages of using these pumps, the following can be noted:
The minimum noise level.
Lack of vibration.
Compact sizes.
Light weight.
Strength and duration of operation.
The possibility of air cooling.
Increased power.
Impressive selection of working pressures.
The design of this equipment provides for the possibility of using this technique where there is a chance of condensate formation. In a situation where it arises in the device itself, this issue is resolved without special problems through a vertical installation.
How it works?
Spirals inside the device are so that they almost touch each other at different points.
The beginning of the suction procedure occurs at the time of the formation of sickle cavities. It is important that the device has a small amount of compressed gaseous mixture. The compression procedure ends due to the connection of the cavities.
A characteristic feature of the pump is the fact that numerous processes of compression, absorption, as well as bumping are carried out at the same time in different cavities.
It is important that the cavities of bumping and absorption are divided using the intermediate part, which significantly reduces the likelihood of gas movement between areas with increased and reduced pressure. It is this feature that provides the opportunity to abandon the use of injection and suction valves.
Today, due to their own design, spiral models are considered the most developing direction in vacuum technique. This explains their popularity and use in various areas of life.