Volute casing of forward curved multi-blades centrifugal fan

A centrifugal fan and volute technology, applied in mechanical equipment, machines/engines, liquid fuel engines, etc., can solve the problem of uneven circumferential airflow at the outlet of the guide ring, and achieve the effect of improving fan performance and reducing noise
CN101718280AInactive Publication Date: 2010-06-02GUANGDONG SUNWILL PRECISING PLASITC CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGDONG SUNWILL PRECISING PLASITC CO LTD
Publication Date
2010-06-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a volute casing of a forward curved multi-blades centrifugal fan, comprising a volute plate, a guide ring arranged on the volute plate and an outlet arranged on the volute plate. The volute casing is characterized in that the guide ring is in a like-ellipsoid shape, wherein the short radius of the elliptic guide ring is slightly smaller than or equal to the inner radius of an impeller, and the short radius is close to a volute tongue area. Because the structure of the volute casing can take both the uniformity of inlet air and the vortex intensity of the impeller close to the guide ring into account, the inlet air condition of the volute tongue area is improved, and an area away from the volute tongue and close to the outlet of the volute casing has a better inlet air condition, thus the vortex intensity and fan noise can be reduced. Because the vortex intensity of the impeller close to the guide ring can be reduced and the circumferential uniformity of air flows of an outlet of the guide ring can be improved, through regulating the position of the elliptic guide ring on the circumference of the volute casing, the requirements of effectively reducing the noise and improving the performance of the fan can be conveniently met.
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Description

technical field

[0001] The invention relates to a forward multi-blade fan, in particular to a volute of a forward multi-blade fan. Background technique

[0002] Existing technologies such as figure 1 As shown, a volute of a multi-blade centrifugal fan includes a volute 1 , a guide ring 3 located on the volute 1 and an outlet 2 located on the volute 1 . Generally, the section of the guide ring is circular, and the diameter of the guide ring has three structures. The first structure is less than or equal to the inner diameter of the impeller; the second structure is between the inner diameter and the outer diameter of the impeller; the third structure is greater than or equal to the outer diameter of the impeller. Since the airflow at the outlet of the multi-wing fan guide ring 3 is unevenly distributed in the circumferential direction, the air intake of the impeller is also uneven. The air intake conditions are better in the area far away from the volute tongue and close to ...

Claims

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