Hot water storage tank-type condensing boiler having multi-stage structure

Abstract

A hot water storage tank-type condensing boiler having a multi-stage structure is provided where the upper end plate of a water tank exposed to a firebox is formed to have a multi-stage structure so that the distances at which each portion of the upper end plate is exposed to a flame are the same to uniformly heat water filled within the water tank at each of the portions. In addition, like the upper end plate, the lower end plate may be formed to have a multi-stage structure so that the distances between each of the stages of the upper end plates and each of the stages of the lower end plate are the same. Thus, furnace tubes passing through the upper and lower end plates may have the same length to improve productivity and provide the same combustion load.

1 . A hot water storage tank-type condensing boiler having a multi-stage structure, comprising:
 a boiler casing ( 110 ) having a firebox ( 111 ) disposed in the boiler casing ( 110 );   a burner ( 151 ) that is installed on an upper portion of the boiler casing ( 110 ) and that emits a flame toward the firebox ( 111 );   an upper end plate ( 121 ) that constitutes an upper plate of a water tank ( 120 ) installed to be exposed to the firebox ( 111 ) and has a multi-stage structure including multi-stage portions ( 121   a,    121   b,  and  121   c ) so that heights of the stages ( 121   a,    121   b,  and  121   c ) are increased from a center of the upper end plate ( 121 ) where distances from the flame that is emitted toward the firebox ( 111 ) are closest, to ends of the upper end plate ( 121 ) where the distances from the burner ( 151 ) to the flame are farthest;   a lower end plate ( 122 ) that constitutes a lower plate of the water tank ( 120 ), has the same pattern as that of the upper end plate ( 121 ) and has a multi-stage structure including multi-stage portions ( 122   a,    122   b,  and  122   c ) so that heights of the stages ( 122   a,    122   b,  and  122   c ) are increased from a center to ends of the lower end plate ( 122 ); and   a plurality of furnace tubes ( 130 ) which are installed to pass through the upper end plate ( 121 ) and the lower end plate ( 122 ), of which open top ends are connected to the firebox ( 111 ) and of which open bottom ends are connected to a combustion gas discharge portion ( 140 ).   
     
     
         2 . The hot water storage tank-type condensing boiler of  claim 1 , wherein distances between each of the stages ( 121   a,    121   b,  and  121   c ) of the upper end plate ( 121 ) and each of the stages ( 122   a,    122   b,  and  122   c ) of the lower end plate ( 122 ) that are disposed directly under each of the stages ( 121   a,    121   b,  and  121   c ) of the upper end plate ( 121 ) are the same, respectively. 
     
     
         3 . The hot water storage tank-type condensing boiler of  claim 2 , wherein the plurality of furnace tubes ( 130 ) have the same length and are respectively installed at each of the stages ( 121   a,    121   b,  and  121   c ) of the upper end plate ( 121 ) and at each of the stages ( 122   a,    122   b,  and  122   c ) of the lower end plate ( 122 ) that have the same distances between each of the stages ( 121   a,    121   b,  and  121   c ) of the upper end plate ( 121 ) and each of the stages ( 122   a,    122   b,  and  122   c ) of the lower end plate ( 122 ). 
     
     
         4 . The hot water storage tank-type condensing boiler of  claim 1 , wherein wrinkled extrusion pins ( 130   a ) are inserted into the furnace tubes ( 130 ). 
     
     
         5 . The hot water storage tank-type condensing boiler of  claim 2 , wherein wrinkled extrusion pins ( 130   a ) are inserted into the furnace tubes ( 130 ). 
     
     
         6 . The hot water storage tank-type condensing boiler of  claim 3 , wherein wrinkled extrusion pins ( 130   a ) are inserted into the furnace tubes ( 130 ).