Rotary kinetic fluid motors or pumps – Method of operation
Patent
1997-04-18
2000-04-18
Verdier, Christopher
Rotary kinetic fluid motors or pumps
Method of operation
415119, 415204, 415206, 4152111, 4152112, 29888024, 298894, F01D 2944
Patent
active
060507721
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for designing a multiblade radial fan and also relates to a multiblade radial fan.
BACKGROUND ART
The radial fan, one type of centrifugal fan, has both its blades and interblade channels directed radially and is thus simpler than other types of centrifugal fans such as the sirocco fan, which has forward-curved blades, and the turbo fan, which has backward-curved blades. The radial fan is expected to come into wide use as a component of various kinds of household appliances.
Quietness of the multiblade radial fan, which has numerous radially directed blades disposed at equal circumferential distance from each other, is heavily affected by the impeller of the multiblade radial fan, compatibility between the impeller and the scroll type casing for accommodating the impeller, and interference between the tongue of the scroll type casing and the blades of the impeller.
The inventors of the present invention proposed design criteria for enhancing the quietness of the impeller of the multiblade radial fan in international application PCT/JP95/00789. No one has ever proposed design criteria for achieving compatibility between the impeller and the scroll type casing accommodating the impeller of the multiblade radial fan, or design criteria for decreasing sound caused by interference between the tongue of the scroll type casing and the blades of the impeller.
DISCLOSURE OF INVENTION
An object of the present invention is to provide design criteria for achieving compatibility between the impeller and the scroll type casing accommodating the impeller of the multiblade radial fan, thereby enhancing the quietness of the multiblade radial fan.
Another object of the present invention is to provide design criteria for decreasing sound caused by interference between the tongue of the scroll type casing and the blades of the impeller of the multiblade radial fan, thereby enhancing the quietness of the multiblade radial fan.
Still another object of the present invention is to provide design criteria for decreasing sound caused by interference between the tongue of the scroll type casing and the blades of the impeller of the multiblade centrifugal fan as generally defined to include the multiblade sirocco fan, the multiblade turbo fan as well as the multiblade radial fan, thereby enhancing the quietness of multiblade centrifugal fans in general.
Another object of the present invention is to provide a method for driving the impeller of the multiblade radial fan under a systematically derived condition of maximum efficiency.
1. Provision of design criteria for achieving compatibility between the impeller and the scroll type casing accommodating the impeller of the multiblade radial fan, thereby enhancing quietness of the multiblade radial fan.
The inventors of the present invention conducted an extensive study and found that there is a definite correlation between the flow coefficient of the impeller under the condition of maximum total pressure efficiency and the specifications of the impeller. The present invention was accomplished based on this finding. An aim of the present invention is therefore to determine the specifications of the impeller and the scroll type casing so as to achieve compatibility between the impeller and the scroll type casing accommodating the impeller under the condition of maximum total pressure efficiency of the impeller, thereby decreasing sound caused by incompatibility between the impeller and the scroll type casing. Moreover, the object of the present invention is to generally decrease sound caused by incompatibility between the impeller and the scroll type casing.
According to the present invention, there is provided a method for designing a multiblade radial fan comprising an impeller having numerous radially directed blades circumferentially spaced from each other and a scroll type casing accommodating the impeller, wherein specification of the impeller and the scroll type casing are determined so as to make the divergence angle
REFERENCES:
patent: 4712976 (1987-12-01), Hopfensperger et al.
Hatakeyama Makoto
Kawaguchi Hideki
Nakamura Yoshinori
Shinbara Noboru
Uemura Takeshi
Toto Ltd.
Verdier Christopher
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