How Do You Create a Vacuum?
Vacuum pumps induce different levels of pressure in two spaces - high and low. When the regions are linked, air molecules will be pulled from the high-pressure space into the low pressure one, leaving the first empty. In other words, this creates a vacuum.
Vacuums can also be created using vacuum generators which work on a venture principle. This is where compressed air passes through a venture chamber designed to move gases or fluids out of a region of space. Venturi or fluid jet vacuum generators rely on the flow of compressed air, gas, or liquid as the motive fluid to pull or create a vacuum at the desired port.
What Happens When a Vacuum Pump Fails?
Like all mechanical devices, vacuum pumps occasionally fail. It may be a sudden failure, for instance, the pump refuses to switch on one day, but you are more likely to encounter a gradual accumulation of symptoms as internal issues worsen over time.
Typical symptoms of impending failure include:
- Oil leakage
- Noisier operation
- Smoke discharge
- A fall in vacuum pressure
What is the Unit of Vacuum?
The Pascal (Pa) is a standard international unit of pressure, named after French physicist Blaise Pascal. This is sometimes used to measure vacuums, but the more usual unit is the Torr, a term derived from a different physicist - the Italian Evangelista Torricelli.
The Torr is defined as equivalent to 1/760th of a standard atmospheric level of pressure. Until recently, a different definition was used - equivalence to a millimetre of mercury in a manometer.
What is the Difference Between a Vacuum Pump and a Compressor?
These two devices have distinct purposes. Pumps are designed to create a vacuum through a combination of high and low-pressure zones. By contrast, compressors draw in air from the surrounding environment and compress this by subjecting it to high pressure. This creates stored energy for eventual discharge to power pneumatic tools and devices.