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A hydraulic friction heating device for providing thermostatically controlled heat to areas requiring heat for comfort or safety. The hydraulic friction heater includes a motor driven positive displacement pump which circulates hydraulic fluid, such as a heat transfer oil, through a tubular coil at

A hydraulic friction heating device for providing thermostatically controlled heat to areas requiring heat for comfort or safety. The hydraulic friction heater includes a motor driven positive displacement pump which circulates hydraulic fluid, such as a heat transfer oil, through a tubular coil at a predetermined pressure or temperature. The frictional resistance of the hydraulic fluid traveling through the coil generates usable heat. A blower is disposed to force ambient air into contact with the motor, pump, and tubular coil, and transfers the heat energy to an area to be heated.

대표청구항 ▼

A hydraulic friction heater comprising: a frame; a heat chamber supported by said frame; a pump mounted on said frame, said pump including a suction port and a discharge port; means for driving said pump; tubing disposed within said heat chamber and having one end disposed in fluid communication wit

A hydraulic friction heater comprising: a frame; a heat chamber supported by said frame; a pump mounted on said frame, said pump including a suction port and a discharge port; means for driving said pump; tubing disposed within said heat chamber and having one end disposed in fluid communication with said discharge port and a second end disposed in fluid communication with said suction port, whereby hydraulic fluid is circulated through said tubing by said pump and the frictional resistance of said hydraulic fluid circulating through said tubing generates usable heat energy; a hydraulic fluid reservoir disposed in fluid communication between said second end of said tubing and said suction port; and a by-pass line disposed in fluid communication between said discharge port and said hydraulic fluid reservoir, said by-pass line including a temperature actuated control valve, said valve being biased in an open position and disposed to move to a closed position when the temperature of said hydraulic fluid exceeds a predetermined level to increase the flow through said tubing.