CONCRETE FINISHING TROWEL Russian patent published in 2024 - IPC F02M21/06 F01P3/20 E04F21/16 

FIELD: engine building.

SUBSTANCE: invention relates to engine building, namely, to power supply systems of internal combustion engines operating on liquefied petroleum gases. Trowel for finishing concrete surface includes internal combustion engine, heat exchange circuit for motor oil and liquefied gas cylinder. Second heat exchange circuit for antifreeze contains a circulation pump, a heat exchanger serving to transfer heat from engine oil to antifreeze, an expansion tank and a gas reducer having two lines. Heated antifreeze from the heat exchanger is supplied to the first line of the reducer, and liquefied gas from the gas cylinder is supplied to the second line via the line for liquid phase of gas. Second output of the second line of the gas reducer is connected in a main line for the gas vapour phase to the inlet manifold of the engine.

EFFECT: increased efficiency of lubricating oil cooling, provision of gas heating in reducer without overheating and increased service life of reducer.

1 cl, 3 dwg