CENTRIFUGAL BLOWER

To provide a centrifugal blower which can suppress noise resulting from a fluctuation vortex.SOLUTION: A fan casing 40 has a communication path forming part 45 at one side of a rotating shaft 32 in an axial direction with respect to an air passage forming part 42. The communication path forming part...

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Bibliographic Details
Main Authors YASUDA MASANORI, KOSAKA SHO
Format Patent
LanguageEnglish
Japanese
Published 22.02.2021
Subjects
BLASTING
HEATING
LIGHTING
MECHANICAL ENGINEERING
NON-POSITIVE DISPLACEMENT PUMPS
POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS
PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
WEAPONS
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Summary:To provide a centrifugal blower which can suppress noise resulting from a fluctuation vortex.SOLUTION: A fan casing 40 has a communication path forming part 45 at one side of a rotating shaft 32 in an axial direction with respect to an air passage forming part 42. The communication path forming part 45 has a first inlet 45b and a second inlet 45c. The first inlet 45b communicates with a space at the outside of a cylindrical part 61 of a separation cylinder 60 out of a suction port 50a of the air passage forming part 42 via a communication path 45a which is formed of the communication passage forming part 45. The second inlet 45c communicates with a space at the inside of the cylindrical part 61. An alignment direction of the first inlet 45b and the second inlet 45c is set as a first direction, and a direction orthogonal to an axial direction and the first direction is set as a second direction. At this time, in a cross section of the cylindrical part 61 orthogonal to the axial direction, a line at an end part side in the second direction including an end part of the cylindrical part 61 in the second direction is formed into a curved line whose degree of curvature is mild compared with a virtual circle with a maximum width of the cylindrical part 61 in the second direction as a diameter.SELECTED DRAWING: Figure 1 【課題】変動渦に起因する騒音を低減できる遠心式送風機を提供する。【解決手段】ファンケーシング４０は、空気通路形成部４２に対して回転軸３２の軸方向の一方側に連通路形成部４５を有する。連通路形成部４５は、第１入口４５ｂおよび第２入口４５ｃを有する。第１入口４５ｂは、連通路形成部４５が形成する連通路４５ａを介して、空気通路形成部４２の吸入口５０ａのうち分離筒６１の筒状部６１の外側の空間に連通する。第２入口４５ｃは、筒状部６１の内側の空間に連通する。第１入口４５ｂと第２入口４５ｃとの並び方向を第１方向とし、軸方向および第１方向に直交する方向を第２方向とする。このとき、軸方向に直交する筒状部６１の断面において、筒状部６１の外面がなす線のうち筒状部６１の第２方向での端部を含む第２方向端部側の線は、筒状部６１の第２方向での最大幅を直径とする仮想円と比較して、曲がり具合が緩やかな曲線である。【選択図】図１
Bibliography:Application Number: JP20190146526