Title:
CENTRIFUGAL BLOWER
Document Type and Number:
WIPO Patent Application WO/2023/182280
Kind Code:
A1
Abstract:
A centrifugal fan (1) comprises an impeller (2) and a scroll casing (3). The impeller (2) is configured to suck in gas through an opening (15) and send the gas out in a centrifugal direction. The scroll casing (3) has a suction port, a blowout port (24) for blowing out the gas sent out by the impeller (2), a peripheral wall (23), and a tongue portion (26). The peripheral wall (23) has a first flat surface portion (31) continuously extending from the tongue portion (26), and a second flat surface portion (31) provided at a position advanced from the first flat surface portion (31) in the direction of rotation of the impeller (2). The peripheral wall (23) is configured such that in a flow path (28) along the peripheral wall (23), a clearance (CL), which is the difference between the distance from the center (CA) of the impeller (2) to the inner peripheral surface (23C) of the peripheral wall (23) and the distance from the center (CA) of the impeller (2) to the outer peripheral surface (2A) of the impeller (2), reaches a minimum on the second flat surface portion (32).
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Inventors:
HIGASHIDA MASAHITO (JP)
IWATA TORU (JP)
TAKADA ANAN (JP)
IWATA TORU (JP)
TAKADA ANAN (JP)
Application Number:
PCT/JP2023/010921
Publication Date:
September 28, 2023
Filing Date:
March 20, 2023
Export Citation:
Assignee:
DAIKIN IND LTD (JP)
International Classes:
F04D29/44; F04D29/66
Domestic Patent References:
| WO2016139732A1 | 2016-09-09 |
Foreign References:
| JP2003035298A | 2003-02-07 | |||
| JP2008267242A | 2008-11-06 | |||
| US5570996A | 1996-11-05 |
Attorney, Agent or Firm:
FUKUI Hiroshi (JP)
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