Explosion-protected diesel engine

Claim 1

An antiexplosion diesel engine system, comprising: a diesel engine having: a fresh-air intake, an exhaust-gas output, and a closed recirculating type cooling system having a pump driven by the engine by means of which a liquid coolant is circulated; and an antiexplosion arrangement for said engine, said antiexplosion arrangement including: an intake flame arrester located at said fresh-air intake and having an arrester housing and at least one plate therein formed with a multiplicity of parallel passages of very small cross section measuring at most 1.0 mm thereacross, a relatively long jacketed exhaust-pipe section connected to said exhaust-gas output and receiving exhaust gases therethrough from said engine, said cooling system being connected to said exhaust-pipe section for cooling exhaust gas traversing same by indirect heat exchange, an exhaust-gas tube-bundle-type heat exchanger connected to said exhaust-gas section, said cooling system being connected to said exhaust-pipe heat exchanger for cooling exhaust gas traversing same by indirect heat exchange, said heat exchanger having a housing separable into two parts, an output flame arrester connected to said exhaust-gas heat exchanger, said output flame arrester having an arrester housing and at least one plate therein formed with a multiplicity of parallel passages of very small cross section measuring at most 1.0 mm thereacross, both of said arrester housings being of substantially greater flow cross sections than respective inlets thereto and outlets therefrom, another relatively short exhaust-gas pipe section interposed between said heat exchanger and said inlet of said output flame arrester, and a venturi-type exhaust-gas diluter downstream of said output flame arrester for mixing ambient air with the exhaust gas cooled in said heat exchanger and passing through said output flame arrester, said diluter including a large-diameter outer tube centered upon an upstream-to-downstream axis and having upstream and downstream ends open to the atmosphere, and a nozzle-type core in the outer tube and forming a plurality of gaps opening radially outwardly and downstream in said outer tube.