Paving machine employing exhaust heat exchanger for screed heati

Details Paving machine employing exhaust heat exchanger for screed heati Paving machine employing exhaust heat exchanger for screed heati

1993-07-20

1999-05-04

Lisehora, James

Road structure, process, or apparatus

Process

Heating

404 95, 404118, E01C 1922, E01C 2314

Patent

active

058996303

ABSTRACT:
A paving machine employs a screed heating system using heat from the exhaust system to heat indirectly the screed to the desired temperature. A heat exchange medium is heated by the exhaust system in a first heat exchanger and is then conveyed to a second heat exchanger where it heats the screed. Measures are taken to supply additional heat to the heat exchange medium as may be required to achieve the required heat transfer in the second heat exchanger. The system operates under low pressure and is thus simpler, less expensive, and less likely to fail than high-pressure systems. Preferably, the heat exchange medium is continuously circulated between the first and second heat exchangers in a closed-loop to minimize the amount of heat exchange medium required and to simplify the system. The system is also preferably designed to permit movement of the screed relative to the remainder of the paving machine and to permit flexing of the screed.

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