Protective circuit for an electrically driven liquid vacuum clea

Details Protective circuit for an electrically driven liquid vacuum clea Protective circuit for an electrically driven liquid vacuum clea

1989-01-30

1990-03-27

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

417 41, 417 36, 417 45, H02H 708

Patent

active

049125877

ABSTRACT:
In connection with a protective circuit for an electrically driven liquid or water vacuum cleaner it is proposed to utilize the abrupt rise of the vacuum, which is encountered when a blocking element interrupts the connection between the receptacle for the liquid and the motor/blower area. The vacuum rise is detected by a diaphragm-type vacuum governor and used for triggering a lockable flip-flop which then interrupts the current supply of the drive motor. The locked condition can be released only by disconnecting the unit from the mains.

REFERENCES:
patent: 4265262 (1981-05-01), Hotine
patent: 4295793 (1981-10-01), McGalliard

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