Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1990-01-12
1991-02-12
Moore, Chris K.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
15314, 15319, A47L 538
Patent
active
049912534
ABSTRACT:
An industrial central vacuum system has a filter chamber having an intake port connectable to a plurality of intake nozzles and an output port, a multispeed blower having an intake side and an output side and energizable for drawing in air at its intake side and expelling it at its output side, a conduit connected between the intake side of the blower and the output port of the filter chamber, and a valve having an outer side opening to ambient pressure and an inner side opening into the conduit. Thus when the valve is open ambient air can be admitted directly into the conduit. A controller is between the blower and the valve for opening the valve prior to energizing and de-energizing the blower and for closing the valve a predetermined interval after energizing the blower. A pressure sensor is provided in the conduit and the blower is operable at a high speed corresponding to a relatively large blower throughput and at a low speed corresponding to a relatively small blower throughput. The controller is also connected to the pressure sensor to open the valve for a predetermined short period of time on switching the valve from the low speed to the high speed. The controller switches the blower from low-speed operation to high-speed operation when pressure in the conduit detected by the sensor drops below a predetermined intermediate threshold level.
REFERENCES:
patent: 3314098 (1967-04-01), Carsey
patent: 4225272 (1980-09-01), Palmovist
patent: 4514874 (1985-05-01), Kurz
Dubno Herbert
Moore Chris K.
Steinemann AG
Wilford Andrew
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