| 摘要 |
PURPOSE:To contrive high pressurization, miniaturization and magnification of a control range of an air quantity of a combustion fan, by making use of a transistor motor, whose ranges of high speed rotation and speed control are wide, as a motor for driving the fan. CONSTITUTION:A transistor motor 2 which is capable of making a high speed rotation and having a wide range of speed control is used as a driving motor of a fan 1 for combustion of a forced supply or discharge gas or petroleum hot water supply machine and an electric current limiting circuit 10 controlling an abnormal high current is provided on a driving circuit 9 of the transistor motor 2. With this construction, the combustion fan 1, which is miniature and having high prssure and a high air quantity, is obtained, resulting in drastic miniaturization of the hot water supply machine. As a result of obtaining a wide range of speed controll peculiarity, an air quantity control range of the combustion fan 1 can be enlarged, and magnification of a combustion range, that is hot water supply peculiarity can be enlarged. |
