Centrifugal blower
CN118891450BActive Publication Date: 2026-07-14DAIKIN INDUSTRIES LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- DAIKIN INDUSTRIES LTD
- Filing Date
- 2023-03-20
- Publication Date
- 2026-07-14
AI Technical Summary
Technical Problem
Existing centrifugal fans are prone to surge and abnormal noise when they have high static pressure characteristics in the small air volume range, and existing technologies are unable to effectively suppress these two phenomena.
Method used
A centrifugal blower was designed, in which a first planar portion and a second planar portion are set in the impeller and vortex shell structure, the flow path spacing ratio and angle are optimized, the number of blades is increased, and a rectification effect is formed to suppress surge and abnormal noise.
Benefits of technology
It effectively suppressed surge and abnormal noise, while improving the static pressure characteristics and static pressure efficiency in the small air volume range.
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Smart Images
Figure CN118891450B_ABST
Abstract
A centrifugal blower (1) is provided with an impeller (2) and a scroll casing (3). The impeller (2) is configured to suck in gas from an opening (15) and send out the gas in a centrifugal direction. The scroll casing (3) is provided with a suction port, a blowout port (24) that blows 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 portion (31) that continuously extends from the tongue portion (26), and a second flat portion (32) that is provided at a position that advances in a rotation direction of the impeller (2) from the first flat portion (31). The peripheral wall (23) is configured such that, in a flow path along the peripheral wall (23), a difference between a distance from a center (CA) of the impeller (2) to an inner peripheral surface (23C) of the peripheral wall (23) and a distance from the center (CA) of the impeller (2) to an outer peripheral surface (2A) of the impeller (2), that is, a gap (CL), is shortest at the second flat portion (32).
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