| 摘要 |
<p>PURPOSE:To contrive to achieve the compactness as a whole by a method wherein a positive displacement air pump for supplying of the primary air and secondary air to a burner is formed to be provided in integral structure manner, with two vane pumps having each different discharging capability and driven by one motor. CONSTITUTION:An air pump equipped in the titled system is provided with each vane pump 19, 20 for supplying of primary and secondary air rotated by a common direct current motor 20 via a rotating shaft 40. Each vane pump 19, 20 includes, in freely rotatable manner, a vane rotor 55 eccentrically supported for a liner 53, in a cylindrical liner 53 fitted to a housing 51. An air is discharged by the compressing and expanding action of a operating chamber formed between a vane 57 and the liner 53 due to the rotation of the rotor 55. In such a structure, the air sucked through an inlet 71 from an air filter 49 is discharged through an outlet 73 after compressing. Each vane pump 19 and 20 is formed to be of different length in axial direction for obtaining of adequately different discharging capacities.</p> |
