JPS62179398U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a schematic front view of the centrifugal fan and casing of the first embodiment of the centrifugal blower of the present invention, Fig. 2 is a schematic front view of the second embodiment, and Fig. 3 is the indoor blower of the air conditioner. FIG. 4 is a schematic front view of a conventional centrifugal fan and a casing. 1: Rotating plate, 2: Rotating shaft, 2a: Rotating center, 3
: blade, 4: centrifugal fan, 5a, 5b: terminal end, 6a: first guide part, 6b: second guide part,
7a: first tongue, 7b: second tongue, 8: casing, 9a: starting end, 9b: starting end, A: gap, B: base line, L1: first tangent, L2: second tangent, θ1: first Angle, θ2: second angle.

Claims (1)

[Scope of utility model registration request] A centrifugal fan has a plurality of blades fixed radially at equal pitches to the center of rotation of a rotating shaft of a rotary plate, and the outer periphery of the centrifugal fan is surrounded with a predetermined gap, and the end is connected to an air outlet. In the centrifugal blower, the centrifugal blower includes a casing including a pair of first and second guide parts, and a first tongue part and a second tongue part formed at the starting ends of each of the first and second guide parts. and the second tongue are formed in an asymmetrical shape when the number of blades is an even number, and are formed in a symmetrical or asymmetrical shape when the number of blades is an odd number with respect to the center of rotation, and the first tongue passes through the center of rotation. A centrifugal blower characterized in that the plurality of blades are arranged on a rotary plate so that they do not overlap at the same time with respect to a first tangent that circumscribes the rotation center and a second tangent that passes through the rotation center and circumscribes the second tangent.