| 摘要 |
An improved carpet cleaning apparatus and method of use is disclosed. The apparatus consists of an internal combustion engine, the exhaust of which is directed through at least one heat exchanger for heating water/chemical cleaning fluid solution. A source of incoming water passes by a regulator into the inlet end of an engine driven pump, then through a balance pressure regulator valve positioned between the pump and the heat exchanger. A bypass valve intercepts a portion of the heated water after it passes by a thermostat downstream of the heat exchanger and directs this portion of heated water into a conduit leading back to the pump inlet thereby preheating the incoming water. A vacuum pump coupled to the engine draws a vacuum in a separate waste water recovery tank. A hand held carpet cleaner wand injects heated water transported under pressure through a flexible hose through an exhaust nozzle into the surface being cleaned. A vacuum intake port adjacent the exhaust nozzle of the wand vacuums up the residual fluid and directs the fluid back to the recovery tank through another flexible hose. The constantly circulating heated bypass water reduces stagnation of water in the heat exchanger when the wand is deactivated thereby effectively preventing a complete shut down of the system due to overheated water sensed by the thermostat in the heat exchanger.
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