Liquid purification or separation – Automatic control – Thermal
Patent
1993-08-03
1995-03-07
Savage, Matthew O.
Liquid purification or separation
Automatic control
Thermal
210168, 2104165, B01D 3514
Patent
active
053955196
ABSTRACT:
Filter devices are useful in hydraulic systems for removing contaminants or foreign particles from the oil in the hydraulic system. One of the problems encountered with such filters is that they are subjected to high pressure drops thereacross when the oil is cold. The subject filter device of one embodiment includes a pump driven by a two-speed electric motor. When the oil temperature is below a predetermined temperature, the pump is driven at a normal speed for increased efficiency and the pressure drop across the filter is within an optimal range. When the temperature of the oil is below a predetermined temperature, the pump is driven at a low speed so that the pressure drop across the filter remains within the optimal range. In another embodiment, an electric motor driving the pump is stopped when the oil temperature is below the predetermined temperature. In a third embodiment, the pump is driven at a substantially constant speed and a laminar flow restriction is positioned upstream of the pump to induce slight cavitation when the oil viscosity is high while permitting normal fluid flow to the gear pump when the oil viscosity is low.
REFERENCES:
patent: 4181611 (1980-01-01), Rubenstein
patent: 4306966 (1981-12-01), Lucia
patent: 4388196 (1983-06-01), Lucia
patent: 4783271 (1988-11-01), Silverwater
Caterpillar Inc.
Grant John W.
Savage Matthew O.
LandOfFree
Filter device for a hydraulic system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Filter device for a hydraulic system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Filter device for a hydraulic system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1404030