Forced suction and exhaust type gas burner apparatus

Claim 1

A forced suction and exhaust type gas burner apparatus comprising a suction-exhaust unit having a fan motor and a burner unit having a combustion part, in which a suction passage and an exhaust passage respectively extend from the combustion part to the outside of a house, the exhaust passage of the suctionexhaust unit and the discharge side of the fan motor provided exteriorly of said suction-exhaust unit being in communication with each other, and a connecting pipe provided at the suction part of the fan motor and a connecting pipe provided in the suction passage of the suction-exhaust unit are extended in the same direction, the positional relation of said two connecting pipes being the same as the positional relation of a suction port and an exhaust port which are provided at the upper surface of the burner unit such that the line connecting them with each other extends in a diagonal direction with respect to said upper surface, so that said suction-exhaust unit may be connected directly to the burner unit and the suction and exhaust ducts may be easily connected to the burner unit and suction-exhaust unit respectively without said two ducts interfering with each other, said apparatus being so designed that the suction-exhaust unit may be connected to the burner unit either directly or through a suction duct and an exhaust duct, and the interior of the burner unit and the interior of the suction duct and exhaust duct may be placed in a negative pressure condition, the ratio of excess air necessary for the combustion of gas being within the range of from 1.2 to 2.5, the P-Q characteristic of said fan motor being set such that curves representing said P-Q characteristic intersect each of the curves representing the frictional loss in said suction and exhaust passages with respect to the excess air ratio when the total length of said suction and exhaust passages is minimum and when the same is maximum within the area defined by said last mentioned curves and lines representing the excess air ratios of 1.2 and 2.5 respectively, irrespective of variations in line voltage or differences in local frequency.