MULTIBLADE CENTRIFUGAL AIR BLOWER

• Main Authors: URABE YUTO, HOSOMI SHOTA, HAYASHI HIROYASU, CHICHII KAZUO, AKISATO YOSHITAKA, TAKAHASHI YUTA, TERAMOTO TAKUYA
• Format: Patent
• Language: English; Japanese
• Published: 01.03.2024
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT PUMPS; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; WEAPONS

To provide a multiblade centrifugal air blower in which separation of airflows on the suction sides of blades is suppressed, which therefore enables a decrease in air volume to be suppressed.SOLUTION: A multiblade centrifugal air blower comprises: a fan having a main plate, a plurality of blades, and an annular side plate that secures ends of the plurality of blades on the opposite side from the main plate; and a scroll casing having a peripheral wall formed in a spiral shape, and at least one side wall that has a bell mouth forming a suction port, the scroll casing receiving the fan. The fan has: a rear-facing vane portion constituting a rear-facing vane at the inner peripheral portion of each of the plurality of blades; a front-facing vane portion constituting a front-facing vane at the outer peripheral portion of each of the plurality of blades; and an inflection portion forming an inflection point between the rear-facing vane portion and the front-facing vane portion. The inflection portion is formed along the entire length of the blade which is the portion between a proximal end portion on the main plate side and a distal end portion on the side plate side of each of the plurality of blades. All portions of the inflection portion in an axial direction are formed in such a manner that it is, in the radial direction of the fan, closer to the inner peripheral side than an inner peripheral end portion that forms an inner edge of the bell mouth.SELECTED DRAWING: Figure 6 【課題】翼の負圧面における気流の剥離を抑制し風量の低下を抑制できる多翼遠心送風機を提供するものである。【解決手段】多翼遠心送風機は、主板と、複数枚の翼と、複数枚の翼の主板と反対側の端部を固定する環状の側板と、を有するファンと、渦巻形状に形成された周壁と、吸込口を形成するベルマウスを有する少なくとも１つの側壁と、を有し、ファンを収納するスクロールケーシングと、を備え、ファンは、複数枚の翼のそれぞれの内周側の部分において後向羽根を構成する後向羽根部と、複数枚の翼のそれぞれの外周側の部分において前向羽根を構成する前向羽根部と、後向羽根部と前向羽根部との変曲点を形成する変曲点部と、を有し、変曲点部は、複数枚の翼のそれぞれの主板側の基端部と側板側の先端部との間の部分である翼の全長にわたって形成されており、変曲点部の軸方向の全ての部分が、ファンの径方向において、ベルマウスの内縁を形成する内周端部よりも内周側に位置するように形成されているものである。【選択図】図６