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US 2009/0263240 A1Published application
Multiblade centrifugal blower
AssigneeMitsubishi Electric Corporation
InventorsKazuki Okamoto, Hitoshi Kikuchi, Yasuyoshi Makino, Hidetoshi Yamato, Shoji Yamada
Life of this patent
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Abstract
A multiblade centrifugal blower in which a length from a rear end to a front end of an outer edge of a blade is shorter than a length from a rear end to a front end of an inner edge of the blade. Moreover, a bell mouth is located at an air inlet such that a distance from a tip part of an inner edge of the blade to an inner wall of a scroll casing is minimum at an inner tip part of the bell mouth.
Claims7
1-6. (canceled)
7:
- A multiblade centrifugal blower comprising:
- a centrifugal fan that includes:
- a hub that is rotated by a motor;
- and
- a plurality of curved rectangular blades that are arranged at predetermined intervals in a circumferential direction of the hub to form a cylindrical basket with an opening on a front side of the hub;
- and
- a scroll casing that includes an air inlet and an air outlet, and that houses the centrifugal fan inside such that the centrifugal fan faces the air inlet, wherein
- rotation of the centrifugal fan causes suction of air from the opening and the air inlet toward a direction of a rotating shaft of the motor, and causes discharge of the air through a space between the blades in a centrifugal direction so that the air is blown out from the air outlet,
- a length B2 from a rear end to a front end of an outer edge of the blade is shorter than a length B1 from a rear end to a front end of an inner edge of the blade, and
- a bell mouth is located at the air inlet such that a distance from a tip part of the inner edge of the blade to an inner wall of the scroll casing is minimum at an inner tip part of the bell mouth.
7 more elements
8:
- The multiblade centrifugal blower according to claim 7, wherein a ratio B2/B1 satisfies 0.75≦B2/B1≦0.95.
9:
- The multiblade centrifugal blower according to claim 7, wherein a ratio B2/B1 is B2/B1≈0.8.
10:
- The multiblade centrifugal blower according to claim 7, wherein an edge from the tip part of the inner edge of the blade to a tip part of the outer edge of the blade is shaped into a straight line.
11:
- The multiblade centrifugal blower according to claim 7, wherein an edge from the tip part of the inner edge of the blade to a tip part of the outer edge of the blade is shaped into a curved line.
12:
- The multiblade centrifugal blower according to claim 7, wherein the tip part of the inner edge of the blade is rounded.