Space heater having a heating air flow duct with a heat exchanger for engine cooling water and one for combustion gases

Claim 2

A space heater particularly for automobiles, comprising means defining a space heating air flow passage, a first heat exchanger arranged in said flow passage for heating the air flowing through said passage, a combustion engine liquid cooling system connected to said first heat exchanger for supplying engine cooling liquid thereto, means for directing air through said air flow passage, a second heat exchanger in said air flow passage for heating the air flowing therethrough, and a fuel operated heating burner for generating heating gases located outside of said air flow passage and connected to said second heat exchanger for supplying heating gases thereto.

Claim 3

A space heater according to claim 1, wherein said second heat exchanger comprises a shallow depth relatively wide heat exchanger filling said heating air flow passage, said heat exchanger including a partial section defining an inlet flow passage on one side connected to said heating burner for the passage of heating gases therethrough, and a partial passage on the other side joining the end of the first passage for return flow in an opposite direction, said heat exchanger having through passages for the passage of air to be heated therethrough in said air flow passage.

Claim 4

A space heater according to claim 1, wherein said fuel heating burner comprises an outer housing, an inner housing spaced inwardly from said outer housing, said outer housing having an inlet opening at one end, blower meanS in said outer housing for pulling combustion air into said housing and for directing it around the annular space between said inner and outer housing, said inner housing having an opening therethrough intermediate its length leading to a combustion chamber therein and having a discharge at the opposite end of said outer housing, a portion of the combustion air moving through the opening of said inner housing into said combustion chamber, and said outer housing having a discharge for said combustion gases and heating air, means for introducing fuel into said combustion chamber and for igniting the fuel therein to generate gaseous products of combustion which move out through said discharge, the heating air moving around said inner housing into mixing engagement with the combustion gases.

Claim 5

A space heater according to claim 1, wherein said second heat exchanger is arranged upstream of said first heat exchanger, blower means in said passage for directing air through said passage and through said first and second heat exchangers for discharge to a space requiring heating, and including a conduit connected between said fuel heating burner and said second heat exchanger forming a mixing conduit, said heating burner having means for directing combustion gases through said conduit and for admixing fresh air to said combustion gases.

Claim 6

A space heater according to claim 4, wherein said fresh air and said combusiton gases are mixed in the range of between 1 to 3 and 1 to 5.

Claim 7

A space heater according to claim 1, wherein said fuel burner includes an inner wall defining a combustion chamber and an outer wall spaced from said inner wall and defining an annular air flow space, passage means from the outer wall space into said inner wall combustion chamber, and means for igniting fuel in said combustion chamber to generate gaseous products of combustion, said outer wall joining the discharge from said combustion chamber.

Claim 8

A space heater according to claim 6, wherein said means for directing said combustion air into said combustion gases comprises an injector.

Claim 9

A fuel heating burner comprising an outer tubular casing and inner tubular casing spaced from said outer tubular casing and defining a combustion chamber with a discharge opening into said outer tubular casing, said outer tubular casing having a discharge downstream of said inner tubular casing discharge opening and having an opposite end with an inlet opening, said inner tubular housing having an opening intermediate its length, means for directing combustion air inwardly to the inlet opening of said outer housing and around said inner wall and through the opening thereof into said combustion chamber with a portion being directed between said inner housing and outer housing to said outer housing discharge.

Claim 10

A fuel heating burner comprising an outer tubular casing and inner tubular casing spaced from said outer tubular casing and defining a combustion chamber with a discharge opening into said outer tubular casing, said outer tubular casing having a discharge downstream of said inner tubular casing discharge opening and having an opposite end with an inlet opening, said inner tubular housing having an opening intermediate its length, means for directing combustion air inwardly to the inlet opening of said outer housing and around said inner wall and through the opening thereof into said combustion chamber with a portion being directed between said inner housing and outer housing to said outer housing discharge.

Claim 11

A fuel heating burner according to claim 8, including a feed pipe for the combustion gases and the heating fluid connected to said outer housing discharge.

Claim 12

A fuel heating burner according to claim 8, wherein said inlet is arranged along the longitudinal axis of said heating burner, said inner housing opening at the opposite end in a discharge along said longitudinal axis coaxial to the outlet of said outer housing.

Claim 13

A fuel heating burner according to claim 8, wherein said combustion chamber is connected to the space between said inner and outer housings by inlet orifices distributed around its circumference.

Claim 14

A fuel heating burner according to claim 8, wherein said first heat exchanger has substantially the same transverse dimensions as said second heat exchanger, said second heat exchanger having a smaller depth than said first heat exchanger and a smaller depth than its transverse dimension.

Claim 15

A space heater particularly for automobiles, comprising a housing defining a space heating air flow passage, a first heat exchanger arranged in said flow passage for heating the air flowing through said passage, a combustion engine liquid cooling system connected to said fiRst heat exchanger for supplying engine cooling liquid thereto to transfer the heat of the cooling liquid to the air flowing through said passage, a second heat exchanger in said air flow passage upstream of said first heat exchanger for heating the air flowing therethrough and through said first heat exchanger for heating the engine cooling liquid supplied thereto as required, a fuel operated heating burner for generating heating gases located outside of said air flow passage and connected to said second heat exchanger for supplying heating gases thereto, and blower means associated with said passage for directing air through said passage and through said first and second heat exchangers for discharge to a space requiring heating.

Claim 16

A space heater particularly for automobiles, comprising a housing defining a space heating air flow passage, a first heat exchanger arranged in said flow passage for heating the air flowing through said passage, a combustion engine liquid cooling system connected to said fiRst heat exchanger for supplying engine cooling liquid thereto to transfer the heat of the cooling liquid to the air flowing through said passage, a second heat exchanger in said air flow passage upstream of said first heat exchanger for heating the air flowing therethrough and through said first heat exchanger for heating the engine cooling liquid supplied thereto as required, a fuel operated heating burner for generating heating gases located outside of said air flow passage and connected to said second heat exchanger for supplying heating gases thereto, and blower means associated with said passage for directing air through said passage and through said first and second heat exchangers for discharge to a space requiring heating.