SINGLE SUCTION TYPE CENTRIFUGAL FAN
First Claim
1. A single suction type centrifugal fan comprising:
- a casing having a spiral shape; and
an impeller housed in the casing and having a plurality of blades and an impeller main plate to which the blades are fixed,the casing includinga suction side plate having a suction port, anda motor fixing side plate to which a motor is fixed,the impeller main plate having a center portion fixed to the motor, whereinthe impeller main plate has a main plate opening formed between the blades and the center portion of the impeller main plate, anda constriction portion is formed where a distance between a blade end portion imaginary plane and the motor fixing side plate becomes narrower between the main plate opening and the blades, where the blade end portion imaginary plane is defined as a plane which passes end portions of the blades on a motor fixing side plate side and is perpendicular to a rotary shaft of the motor.
3 Assignments
0 Petitions
Accused Products
Abstract
A single suction type centrifugal includes: a casing having a spiral shape; and an impeller housed in the casing and provided with a plurality of blades and an impeller main plate to which the blades are fixed. The casing includes a suction side plate having a suction port, and a motor fixing side plate to which a motor is fixed. A center portion of the impeller main plate is fixed to the motor, and a main plate opening is formed in the impeller main plate between the blades and a center portion of the impeller main plate. A plane which passes end portions of the blades on a motor fixing side plate side and is perpendicular to a rotary shaft of the motor is assumed as a blade end portion imaginary plane. A constriction portion is formed where a distance between the blade end portion imaginary plane and the motor fixing side plate is narrowed between the main plate opening and the blades.
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Citations
6 Claims
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1. A single suction type centrifugal fan comprising:
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a casing having a spiral shape; and an impeller housed in the casing and having a plurality of blades and an impeller main plate to which the blades are fixed, the casing including a suction side plate having a suction port, and a motor fixing side plate to which a motor is fixed, the impeller main plate having a center portion fixed to the motor, wherein the impeller main plate has a main plate opening formed between the blades and the center portion of the impeller main plate, and a constriction portion is formed where a distance between a blade end portion imaginary plane and the motor fixing side plate becomes narrower between the main plate opening and the blades, where the blade end portion imaginary plane is defined as a plane which passes end portions of the blades on a motor fixing side plate side and is perpendicular to a rotary shaft of the motor. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification