Types of Vacuum Generators
Vacuum generators is one of the most important vacuum component in the vacuum lifting system. They provides vacuum to the requires vacuum system for handling and lifting application. The vacuum can be created by electrical way and pneumatical way.
In electrical way, vacuum pumps and vacuum blowers are commonly used to generate different level of vacuum. A vacuum pump can provide higher vacuum but relatively lower air flow. On the contrary, vacuum blower produces lower level of vacuum but higher air flow. In terms pneumatic way, ejector is one of the most common way to create vacuum by compressed air.
Electrical Vacuum Generators
Vacuum pump is a classic vacuum generators that are able to generate differential pressure in a sealed space (similar to a compressor). This generates a relatively high final vacuum (max. 99.9%). There are various designs. Dry-running and circular oil lubricated rotary vane pumps, claw pumps, liquid ring and screw pumps. Rotary vane pumps and claw pumps are the most reliable pumps in handling technology. The first pump was invented by Otto von Guericke. He also used it to study the phenomenon of vacuum and the role of air in combustion and respiration.
Most common types of vacuum pumps are:
A dry-running rotary vane vacuum pump operates by the same way as an oil-lubricated vacuum pumps but with no lubrication fluids. To maintain proper system temperature, a powerful cooling fan is necessary to remove heat from both the motor and pump. Dry-running pump is overall good for universal use. It works good on large handling system for workpieces with air-tight surface.
An oil-lubricated rotary vane pump comes with extremely high vacuum level with up to 95% vacuum. And it is widely used in handling systems with low degree of noise and low maintenance needed. To ensure high level of vacuum, it works perfectly in air-tight workpieces.
The side channel blower and compressor are common vacuum generators that generates a differential pressure in which large quantities of air can be moved (similar to a vacuum cleaner). The underpressure that is generated is in the lower range (max. -450 mbar). There are single-stage and double-stage compressors. The difference is the underpressure that can be achieved (single-stage up to a maximum of -250 mbar, double-stage up to a maximum of -450 mbar).
Two common types of vacuum blower in the market:
Pneumatic Vacuum Generators
Ejectors: Easy-to-install vacuum generators with in-field compressor
An ejector is one of vacuum generators that generates negative pressure by high-pressure air flow. And that therefore has a predominantly sucking effect thanks to Bernoulli’s Principle which states: ‘When the speed of a fluid increases its pressure decreases and vice versa’. The simple design of the main body, venturi nozzle and also the silencer make it low maintenance and wear-resistant.
However, the required high compressed air consumption is relatively more expensive to operate. Due to their small size, ejectors are commonly used in limited space such as for the packaging industry.
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