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US 7,124,749 B2Granted
Air transfer apparatus and control method of air transfer apparatus
AssigneeHitachi, Ltd.
InventorsHironori Ohhashi, Hajime Hosoya
Life of this patent
Estimating the term…
Abstract
A check valve disposed between an air pump and a section to be pressurized, is held in a closed state when the section is pressurized by said air pump, and is operated to open when the electric power is supplied to an electromagnetic solenoid. In an abnormally pressurized state, the power supply to the electromagnetic solenoid is shut off, to forcibly close the check valve.
Claims14
An air transfer apparatus comprising:
- an air pump transferring air to a shielded section;
- and
- a check valve disposed in a passage through which the air is transferred by said air pump, said check valve comprising:
- a spring urging said valve body to be closed;
- and
- an actuator operating a valve body to open,
- wherein said check valve is capable of performing a desired opening/closing operation,
- wherein said check valve is held in a closed state when said actuator does not operate, while being held in an opened state when said actuator operates,
- wherein an urging force for valve closing by said spring is set to be a value by which said valve body is held in a closed state thereof, even if a primary side pressure of said valve body is maximized by said air pump, and
- wherein said actuator generates, according to a control signal, a driving force for opening said valve body against the urging force for valve closing by said spring.
7 more elements
A control method of an air transfer apparatus equipped with an air pump transferring air to a shielded section;
- and a check valve disposed in a passage through which the air is transferred by said air pump, said check valve including an actuator operating a valve body to open, the control method comprising the steps of:
- judging whether said check valve is required to open or close, by:
- detecting an abnormal state where said air pump is unable to be stopped based on a pressure in said shielded section;
- and
- judging that said check valve is required to close when said abnormal state is detected;
- generating valve opening energy by the actuator in response to a requirement for opening said check valve, to open said check valve;
- and
- stopping the generation of the valve opening energy by the actuator in response to a requirement for closing said check valve, thereby holding said check valve in a closed state.
5 more elements
A control method of an air transfer apparatus equipped with an air pump transferring air to a shielded section;
- and a check valve disposed in a passage through which the air is transferred by said air pump, said check valve including an actuator operating a valve body to open, the control method comprising the steps of:
- judging whether said check valve is required to open or close by:
- detecting an abnormal state of a pressure in said shielded section by:
- detecting an activation of said air pump;
- and
- judging the activation of said air pump, as the requirement for opening said check valve, and
- judging that said check valve is required to close when said abnormal state is detected;
- generating valve opening energy by the actuator in response to a requirement for opening said check valve, to open said check valve after said air pump is activated;
- and
- stopping the generation of the valve opening energy by the actuator in response to a requirement for closing said check valve, thereby holding said check valve in a closed state.
7 more elements
A control method of an air transfer apparatus equipped with an air pump transferring air to a shielded section;
- and a check valve disposed in a passage through which the air is transferred by said air pump, said check valve including an actuator operating a valve body to open, the control method comprising the steps of:
- judging whether said check valve is required to open or close by:
- detecting a requirement for stopping said air pump;
- and
- judging the requirement for stopping said air pump, as the requirement for closing said check valve, and
- generating valve opening energy by the actuator in response to a requirement for opening said check valve, to open said check valve before said air pump is stopped;
- and
- stopping the generation of the valve opening energy by the actuator in response to a requirement for closing said check valve, thereby holding said check valve in a closed state.
5 more elements
Dependencies are inferred from the claim text.