초록 ▼

A device for controlling the operation of a vacuum cleaner and for signalling the dust bag fill level, the existence a clogged pipe or of secondary air openings, or the like has an air turbine arranged in the exhaust air flow generated by the blower of a vacuum cleaner, downstream of the dust bag, w

A device for controlling the operation of a vacuum cleaner and for signalling the dust bag fill level, the existence a clogged pipe or of secondary air openings, or the like has an air turbine arranged in the exhaust air flow generated by the blower of a vacuum cleaner, downstream of the dust bag, whose rotary speed or the air turbine is detected in a non-contact manner, converted into an electric indication signal and supplied to a control circuit which controls the blower motor. Based upon the rotary speed so detected, it is then possible to determine the momentary operating conditions of the vacuum cleaner and/or the dust bag fill level, to emit signals warning the operator that the dust bag has to be changed, and also to display finely graded percentage statements or applicable text messages for the user. By combining this information with pressure values picked up by diaphragm-type switches, it is possible to accurately determine the operating conditions to be indicated.

대표청구항 ▼

A device for controlling the operation of a vacuum cleaner, having a blower (15) driven by a motor for creating an air flow, a dust bag, an exhaust air passage, and an air turbine arranged for generating an output signal proportional to the air flow rate and a supply means for supplying the signal t

A device for controlling the operation of a vacuum cleaner, having a blower (15) driven by a motor for creating an air flow, a dust bag, an exhaust air passage, and an air turbine arranged for generating an output signal proportional to the air flow rate and a supply means for supplying the signal to a control circuit controlling the motor, characterized in that said air turbine (19) with a shaft mounted for rotation is located in the exhaust air flow of the vacuum cleaner, downstream of the blower (15) and the dust bag (13), and non-contact scanning means are provided for detecting the rotary movement of the air turbine without contact with the turbine and without contact with the shaft of the turbine and converting the detected movement into an electric output signal.