Pump apparatus and method of operating pump
AssigneeSugino Machine Limited
InventorToyohiro Yamauchi
Life of this patent
Estimating the term…
Abstract
Provided is a pump apparatus capable of suppressing an unintentional ejection of a high-pressure liquid from a nozzle. A pump apparatus including: an injection chamber having a door; a nozzle arranged in the injection chamber; a pump connected to the nozzle for discharging liquid; a motor for driving the pump; a door sensor for detecting that the door is closed; and a control device capable of communicating with the door sensor, the control device having a motor rotation unit for supplying driving power to the motor only when the door sensor detects that the door is closed.
Claims5
A method of operating a pump of a pump apparatus, comprising:
- closing a door of an injection chamber that contains a nozzle;
- rotating a motor that drives a pump while the door is closed, the pump connected to the nozzle to eject liquid at a pressure exceeding a safety pressure while cleaning;
- detecting a rotation speed of the pump;
- inactivating the motor in a state in which the pump is still rotatable while the door is closed to stop the cleaning;
- opening the door when the rotation speed of the pump is equal to or less than a threshold value, the threshold value being a rotation speed of the motor at which a discharge pressure of the pump is equal to or less than the safety pressure;
- continuing to monitor that the rotation speed of the pump is equal to or less than the threshold value while the door is open;
- and
- stopping the pump apparatus in an emergency when the rotation speed of the pump exceeds the threshold value while the door is open.
Dependencies are inferred from the claim text.