JPS5824109Y2 - ventilation fan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ventilation fan in which a drive motor is disposed in one corner of an outer frame to rotationally drive the blower blades through a rotation transmission means such as a belt transmission means.

Conventionally, this type of ventilation fan had a configuration in which the drive motor was placed outside the bell mouth and installed in the corner of the outer frame, so the drive motor was located outside the ventilation flow generated by the blower blades. There is a drawback that the ventilation flow from the blower blade cannot be used effectively to cool the drive motor, and there is also a drawback that the outer plate is larger than the outside diameter of the blower blade.

The present invention was developed in view of the above circumstances, and its purpose is to provide a bell mouth with a notch facing one corner of the outer frame, and to arrange a part of the drive motor so as to face the notch. By adopting this configuration, the drive motor can be cooled by effectively using the air flow of the blower blades, and the outer frame can be made smaller without changing the outer diameter of the blower blades, resulting in lighter weight and lower costs. The aim is to provide a ventilation fan that can achieve this.

An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes an outer frame having a rectangular outer periphery and a frame-shaped portion 1a bent at a substantially right angle toward the indoor side at the outer periphery, and a circular opening 2 on the inner periphery thereof. is forming.

Reference numeral 3 denotes a substantially annular bell mouth with an arcuate cross section formed by curving the peripheral edge of the opening 2 toward the indoor side, and this bell mouth 3 is shown in FIG. A notch 4 is provided in a portion opposite to one corner located at the lower left side.

Reference numeral 5 denotes a support frame having a bearing member 6 in the center thereof, which is oriented radially in all directions from the bearing member 6, and whose tips are fixed to each corner of the frame-shaped portion 1a of the outer frame 1. has a rectangular cylindrical cross section.

Reference numeral 7 denotes a rotary shaft rotatably supported by a bearing member 6, to one end of which a blowing blade 8 is fixed, and to the other end a driven pulley 9 is fixed.

Reference numeral 10 denotes a drive motor fixed to the support frame 5 via a support plate 11 so as to face the notch 4, and provided in the lower left corner of the outer frame 1, and this is arranged so as to face the notch 4. has been done.

Reference numeral 12 denotes a drive pulley fixed to the drive shaft 10a of the drive motor 10, and a belt 13 serving as rotation transmission means is stretched between this and the driven pulley 9.

Next, the operation of this embodiment configured as above will be explained. When the drive motor 10 is energized, the drive pulley 12,
The blower blade 8 is rotated via the belt 13 and the driven pulley 9, and air inside the room is blown toward the outside as shown by arrow A, thereby ventilating the room.

On the other hand, in the portion of the bell mouth 3 facing the notch 4, the air inside the room is not guided by the bell mouth 3 but is sucked into the blower blade 8, so that the arrow B1. B
As shown at 2, the air passes around the drive motor 10 and is sucked into the blower blade 8.

In the above embodiment, the drive motor 10 is supported by the support frame 5 via the support plate 11, but the point is that the drive motor 10 is located within one corner of the outer frame 1 and the notch 4
Just place it so that it faces you.

As is clear from the above description, the present invention provides a bell mouth with a cutout facing one corner of the outer frame, positions the drive motor in the corner of the outer frame, and moves the drive motor through the cutout. Since the arrangement is such that the air flow generated by the blower blades passes around the drive motor towards the notch, the drive motor is well cooled. Since it can be installed close to the blade, the outer frame can be made smaller without changing the outer diameter of the blower blade or the inner diameter of the bell mouth, etc., and the distance between the shafts of the drive motor and the blower blade can be shortened, making it a rotation transmitting means. It is possible to provide a ventilation fan that can be made smaller and lighter, and can be made lighter and lower in cost overall.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a front view, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG.
FIG. 3 is an enlarged cross-sectional view taken along line III-III in FIG.
FIG. 4 is an enlarged perspective view of the main part, and FIG. 5 is an enlarged side view of the main part for explaining the operation. In the drawings, 1 is an outer frame, 3 is a bell mouth, 4 is a notch, 8 is a blower blade, 10 is a drive motor, and 13 is a belt (rotation transmission means).

Claims (1)

[Scope of utility model registration request] a generally rectangular outer frame; a blower blade having a rotary shaft rotatably supported on a support frame provided on the outer frame; and an outer frame provided on the outer frame so as to cover an outer peripheral portion of the blower blade. a substantially annular bell mouth having a notch facing one corner; and a bell mouth provided within one corner of the outer frame and facing the notch so as to drive the blower blade via a rotation transmission means. A ventilation fan comprising a drive motor.