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Exhaust gas liquid heating system for internal combustion engines

  • US 4,593,753 A
  • Filed: 11/09/1984
  • Issued: 06/10/1986
  • Est. Priority Date: 11/09/1984
  • Status: Expired due to Fees
First Claim
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1. An exhaust gas liquid heating system for a two cylinder internal combustion engine, said system comprising a main heat exchanger spaced from an engine exhaust manifold and connected thereto by a pair of primary exhaust pipes which extend, in use, between exhaust ports of the engine and said main heat exchanger, said main heat exchanger comprising;

  • inner and outer tubes forming a liquid jacket therebetween, inlet means whereby said primary exhaust pipes are respectively connected to communicate with the bore of said inner tube adjacent opposite ends thereof, outlet means whereby a secondary exhaust pipe is connected to communicate with the bore of said inner tube between the ends thereof and at a point substantially mid-way between said inlet means, and end caps forming a fluid seal over the ends of said tubes; and

    a serial liquid circuit including a holding tank, a pump for pumping liquid from said tank through a series of heat conducting coils wound around said primary and secondary exhaust pipes and in contact therewith, a liquid inlet on said main heat exchanger for providing communication between an end of said coils and said liquid jacket, and a liquid outlet on said main heat exchanger for providing communication between said liquid jacket and a tube extending to said holding tank, said liquid inlet and outlet being spaced apart along a portion of the length of said main heat exchanger being a similar portion over which said inlet and outlet means are spaced whereby exhaust gases passing along said inner tube between said inlet means and outlet means causes heat to be supplied to liquid passing along said liquid jacket between said liquid inlet and liquid outlet.

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