|Vacuum Equipment-Glossary of Terms
[Term](Max.) suction flow rate
Volume of air taken in by the ejector. The maximum value is the volume of air taken in
without having anything connected to the vacuum port.
[Term]Maximum vacuum pressure
The maximum value of the vacuum pressure generated by the ejector.
[Term]Air consumption
The compressed volume of air consumed by the ejector.
[Term]Standard supply pressure
The optimal supply pressure for operating the ejector.
[Term]Exhaust characteristics
The relationship between the vacuum pressure and the suction flow rate when the supply pressure to the ejector has been changed.
[Term]Flow-rate characteristics
The relationship between the vacuum pressure and the suction flow rate with the standard supply pressure supplied to the ejector.
[Term]Vacuum pressure switch
Pressure switch for verifying the adsorption of a workpiece.
[Term]Suction verification switch
Switch, based on an air pressure bridge, for verifying the adsorption of a workpiece.
It is used when the adsorption pad and the nozzle are extremely small.
[Term](Air) supply valve
Valve for supplying compressed air to the ejector.
[Term](Vacuum) release valve
Valve for supplying positive pressure or air for breaking the vacuum state of the adsorption pad.
[Term]Flow adjustment valve
Valve for adjusting the volume of air for breaking the vacuum.
[Term]Release pressure
Pressure for breaking the vacuum.
[Term]Pilot pressure
Pressure for operating the ejector valve.
[Term]External release
The action of breaking the vacuum using externally supplied air instead of using the ejector unit.
[Term]Vacuum port
Port for generating vacuum.
[Term]Exhaust port
Port for exhausting air consumed by the ejector, and air taken in from the vacuum port.
[Term]Supply port
Port for supplying air to the ejector.
[Term]Back pressure
Pressure inside the exhaust port.
[Term]Leakage
The entry of air into the vacuum passage, such as from an area between a workpiece and a pad, or between a fitting and a tube. The vacuum pressure decreases when leakage occurs.
[Term]Response time
The time from the application of the rated voltage to the supply valve or release valve,until V port pressure reaches the specified pressure.
[Term]Average suction flow rate
The suction flow rate by the ejector or pump for calculating the response speed. It is 1/2 to 1/3 of the maximum suction flow rate.
[Term]Conductive pad
A low electrical resistance pad for electrostatic prevention measure.
[Term]Vacuum pressure
Any pressure below the atmospheric pressure. When the atmospheric pressure is used as a reference, the pressure is presented by –kPa (G), and when the absolute pressure is used as a reference, the pressure is represented by kPa (abs).
When referencing a piece of vacuum equipment such as an ejector, the pressure is generally represented by –kPa.
[Term]Ejector
A unit for generating vacuum by discharging the compressed air from a nozzle at a high speed, based on the phenomenon in which the pressure is reduced when the air around the nozzle is sucked.
[Term]Air suction filter
Vacuum filter provided in the vacuum passage for preventing the dust intrusion into the ejector, vacuum pump, or peripheral equipment.