Gas furnace

Abstract

Provided is a gas furnace. The gas furnace includes: a manifold with an exhaust port for discharging fuel gas; a nozzle attached to the exhaust port; a burner for burning a mixture of air and fuel gas ejected from the nozzle; a primary heat exchanger that provides a first flow path and allows a combustion gas produced by the combustion of the mixture to move through the first flow path; and a secondary heat exchanger located adjacent to the primary heat exchanger, that provides a second flow path and allows the combustion gas discharged from the primary heat exchanger to move through the second flow path, wherein the secondary heat exchanger includes: at least one tube forming the second flow path; and a baffle inserted into the at least one tube, the baffle including: a plate longitudinally extending in a lengthwise direction and twisted in the shape of a screw; and a plurality of holes formed to penetrate the plate.

What is claimed is: 
     
         1 . A gas furnace comprising:
 a manifold with an exhaust port for discharging fuel gas;   a nozzle attached to the exhaust port;   a burner for burning a mixture of air and fuel gas ejected from the nozzle;   a primary heat exchanger that provides a first flow path and allows a combustion gas produced by the combustion of the mixture to move through the first flow path; and   a secondary heat exchanger located adjacent to the primary heat exchanger, that provides a second flow path and allows the combustion gas discharged from the primary heat exchanger to move through the second flow path,   wherein the secondary heat exchanger comprises:   at least one tube forming the second flow path; and   a baffle inserted into the at least one tube,   wherein the baffle comprises:   a plate extending long in a lengthwise direction of the tube and twisted in the shape of a screw; and   a plurality of holes formed to penetrate the plate.   
     
     
         2 . The gas furnace of  claim 1 , wherein the plate comprises a plurality of segments, and the plurality of holes are formed in the plurality of segments, respectively. 
     
     
         3 . The gas furnace of  claim 1 , wherein the plate comprises a plurality of segments, and the plurality of holes are formed in each of the plurality of segments. 
     
     
         4 . The gas furnace of  claim 1 , wherein the plurality of holes are formed for each pitch of a screw pattern on the plate, and are sequentially arranged along the central axis of the tube. 
     
     
         5 . The gas furnace of  claim 1 , wherein the plurality of holes are formed for each pitch of a screw pattern on the plate and arranged in an alternating fashion along the central axis of the tube. 
     
     
         6 . The gas furnace of  claim 1 , wherein the plurality of holes comprises:
 a plurality of holes in a first row formed along the central axis of the tube;   a plurality of holes in a second row formed along the central axis of the tube, spaced apart from the central axis of the tube;   a plurality of holes in a third row formed along the central axis of the tube, spaced apart from the central axis of the tube, and facing the plurality of holes in the second row with respect to the central axis of the tube.   
     
     
         7 . The gas furnace of  claim 1 , wherein the plurality of holes form cutouts on at least one edge of the plate in a width direction, and the cutouts have an overall triangular shape. 
     
     
         8 . The gas furnace of  claim 7 , wherein the cutouts have an overall rectangular shape.