Multi-layer heating apparatus

Abstract

A multi-layer heating apparatus having a heating unit ( 1 ) provided on the bottom of a cooking device ( 5 ), and an accumulator ( 2 ) attached to the heating unit ( 1 ). The heating unit ( 1 ) is filled with a liquid that needed to be heated and set above of a heat source ( 7 ). The heating apparatus is characterized in that at least one air conduit tube ( 3 ) is provided on the top of the heating unit ( 1 ) for leading the exhaust gas out. The air conduit tube ( 3 ) and multi layers hot water pipes ( 121 ) provided in the heating unit ( 1 ) served as a heating means, which can heat up the liquid efficiently.

1 . A multi-layer heating apparatus comprising a heating unit ( 1 ), an accumulator ( 2 ) provided outside of the heating apparatus and linked to the heating unit for reserving and refilling liquid; a liquid to be heated is provided on a top of the heating unit, and a heating source is provided on a bottom thereof, wherein
 At least one air conduit tube ( 3 ) is provided on an upper portion of the heating unit ( 1 ); an end thereof joins a side of the heating unit ( 1 ) and another end extends to an opposite side throughout the heating unit ( 1 ) and attaches to a fume vent ( 4 ); the fume vent is set extending upwardly along a side wall of the apparatus and having its terminal set on the top of the apparatus.   
     
     
         2 . The multi-layer heating apparatus of  claim 1 , wherein at least one through hole ( 31 ) is provided throughout said air conduit tube ( 3 ) for transferring liquid. 
     
     
         3 . The multi-layer heating apparatus of  claim 1 , wherein a plurality of concavities ( 32 ) are provided on a surface of said air conduit tube. 
     
     
         4 . The multi-layer heating apparatus of  claim 3 , wherein said concavities ( 32 ) are spaced with each other by a predetermined distance and arranged in pluralities of rows; said rows are arranged in a staggered formation. 
     
     
         5 . The multi-layer heating apparatus of  claim 1 , wherein an orifice ( 41 ) is provided on a lower section of said fume vent ( 4 ) for increasing air convection. 
     
     
         6 . The multi-layer heating apparatus of  claim 1 , wherein said heating unit ( 1 ) including an outer casing ( 11 ), an inner casing ( 12 ), which is disposed in the outer casing ( 11 ), having a plurality of hot water tubes ( 121 ) provided horizontally therein, an inlet tube ( 13 ) provided between said outer casing ( 11 ) and the accumulator ( 2 ), and at least one outlet tube ( 14 ) connected to the outer casing ( 11 ). 
     
     
         7 . The multi-layer heating apparatus of  claim 6 , wherein said outer casing ( 11 ) comprising a square hollow portion ( 111 ) and a tapered opening ( 112 ) attached to a top of said square portion ( 111 ); a bottom of said square portion ( 111 ) is coupled to a bottom of the inner casing ( 12 ) and a top of said tapered opening ( 112 ) is coupled to an inner wall of the heating apparatus. 
     
     
         8 . The multi-layer heating apparatus of  claim 7 , wherein said inlet tube ( 13 ) and said tapered opening ( 112 ) are joined by a first relief pipe ( 15 ). 
     
     
         9 . The multi-layer heating apparatus of  claim 1 , wherein a second relief pipe ( 16 ) penetrates a side wall of an upper portion of the heating unit ( 1 ) and links to the accumulator ( 2 ). 
     
     
         10 . The multi-layer heating apparatus of  claim 6 , wherein said hot water tubes ( 121 ) are arranged in pluralities layers; each layer including a plurality of tube spaced by a predetermined distance, and the tubes of one layer are perpendicular with tubes of a lower layer.