Heating apparatus

Abstract

A first flow passage (R 1 ) in which uncombusted gas (G 1 ) that contains a combustible fuel is injected from a nozzle hole that is smaller than the flame quenching distance at a flow speed to thereby enable flame maintenance is combusted, and thereby enables flow of combustion gas (G 2 ) resulting from such combustion, and a second flow passage (R 2 ) formed about the first flow passage and enabling flow of uncombusted gas supplied through the nozzle hole are provided. According to the present invention, the combustion chamber in a heating apparatus that heats a liquid to be heated is be reduced in size, the flame in the combustion chamber can be stabilized, and energy efficiency can be improved.

1 . A heating apparatus comprising a first flow passage in which uncombusted gas that contains a combustible fuel is injected from a nozzle hole that is smaller than the flame quenching distance at a flow speed to thereby enable flame maintenance is combusted, and thereby enables flow of combustion gas resulting from such combustion, and a second flow passage enabling flow of uncombusted gas supplied through the nozzle hole. 
     
     
         2 . The heating apparatus according to  claim 1 , further comprising a third flow passage surrounded by the first flow passage and enabling flow of the liquid to be heated, and wherein the second flow passage is formed about the first flow passage. 
     
     
         3 . The heating apparatus according to  claim 2 , wherein the third flow passage is configured from an inner space of a third pipe, the first flow passage is configured from a space sandwiched by the third pipe and the first pipe concentrically enclosing the third pipe, and the second flow passage is configured from a space sandwiched by the first pipe and the second pipe concentrically enclosing the first pipe. 
     
     
         4 . The heating apparatus according to  claim 3 , wherein a plurality of fins is configured to project towards the first flow passage from an outer peripheral face of the third pipe. 
     
     
         5 . The heating apparatus according to  claim 3 , wherein the third pipe is curved toward the first flow passage side and the second flow passage side at a predetermined interval. 
     
     
         6 . The heating apparatus according to  claim 3  comprising the second flow passage, the first flow passage formed about the second flow passage, and the third flow passage enables flow of the liquid to be heated and is formed about the first flow passage. 
     
     
         7 . The heating apparatus according to  claim 6 , wherein a guide portion guides the combustion gas from the first flow passage to a region opposite the first flow passage and being on an outer side of the third flow passage. 
     
     
         8 . The heating apparatus according to  claim 6 , wherein the second flow passage is configured from an inner space in the second pipe, the first flow passage is configured from the space sandwiched by the second pipe and the first pipe that concentrically surrounds the second pipe, and the third flow passage is configured from the space sandwiched by the first pipe and the third pipe that concentrically surrounds the first pipe. 
     
     
         9 . The heating apparatus according to  claim 6 , wherein the second flow passage is configured from an inner space of the second pipe, the third flow passage is configured from the inner space of a plurality of fourth pipes disposed at a distance from the second pipe centering on the second pipe, and the first flow passage is configured from a space surrounded by the second pipe and the partitions closing the interval between the pairs of fourth pipes and fourth pipes. 
     
     
         10 . The heating apparatus according to  claim 7 , wherein the second flow passage is configured from an inner space in the second pipe, the first flow passage is configured from the space sandwiched by the second pipe and the first pipe that concentrically surrounds the second pipe, and the third flow passage is configured from the space sandwiched by the first pipe and the third pipe that concentrically surrounds the first pipe. 
     
     
         11 . The heating apparatus according to  claim 7 , wherein the second flow passage is configured from an inner space of the second pipe, the third flow passage is configured from the inner space of a plurality of fourth pipes disposed at a distance from the second pipe centering on the second pipe, and the first flow passage is configured from a space surrounded by the second pipe and the partitions closing the interval between the pairs of fourth pipes and fourth pipes.