Centrifugal fan

A technology of centrifugal fans and hubs, which is applied in non-variable pumps, radial flow pumps, pump components, etc., and can solve problems such as difficulty in utilizing the diffusion effect
CN104903590AInactive Publication Date: 2015-09-09DAIKIN IND LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
DAIKIN IND LTD
Publication Date
2015-09-09
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

A centrifugal fan (23) is provided with a hub (15), blades (21), and a shroud (19). Each of the blades (21) has a curved section (21d) which is curved so as to be tilted to the side (21c1) on which an air current impinges when the connection end section (21c) where the blade (21) and the portion of the shroud (19) which protrudes inward are joined moves in the rotational direction of the centrifugal fan (23). The hub (15) has a hub-side diffuser ring (27) protruding to the outer peripheral side of the blades (21). The shroud (19) has a shroud-side diffuser ring (26) which protrudes to the outer peripheral side of the blades (21).
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Description

technical field

[0001] The invention relates to a centrifugal fan. Background technique

[0002] Conventionally, in air conditioners and other air conditioners for large-scale air conditioning inside buildings, centrifugal fans such as turbo fans have been used to supply air at high pressure. The turbofan is a fan with blades facing backward, and is configured to blow airflow outward in the radial direction. Therefore, the turbofan has the advantage of being simple in structure without needing a volute like a sirocco fan. However, since the airflow blown out from the vane interferes with objects around the vane and the flow is disturbed, there is a problem of an increase in noise and a decrease in efficiency.

[0003] In this regard, conventional turbofans such as those described in Patent Document 1 and Patent Document 2 are equipped with a hub, a plurality of blades arranged in a row in the circumferential direction of the hub, and a shroud arranged on the opposite side ...

Claims

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