JPH0792080B2 - Blower - Google Patents

Description

The present invention relates to a blower, and more particularly to a cooling device for a motor thereof.

[Prior Art] It is well known that a motor generates heat during operation.
Therefore, large motors are provided with heat radiation fins on the outer shell. However, most of the relatively small motors do not have a heat radiation fin, and if necessary, a heat radiation mechanism such as that disclosed in Japanese Utility Model Publication No. 49-15130 is provided. That is,
Cooling of the motor is performed by fitting and fixing a heat radiating ring having heat radiating fins on the outer shell of the motor, or by further attaching a heat radiating fan to the rotating shaft of the motor in addition to the heat radiating ring.
As a countermeasure against the heat of the motor, it is the current situation that the fan has an open motor or a large motor.

[Problems to be Solved by the Invention] In a conventional blower with an open motor, although heat dissipation is good, dust easily enters the inside of the blower, which tends to cause deterioration of the bearing function and insulation failure. What has been done includes problems to be solved, such as an increase in the cost of the blower.

The present invention has been made to solve such a conventional problem, and an object thereof is to obtain a low-cost blower capable of cooling a motor with a simple structure without making the motor open or upsized. It is what

[Means for Solving the Problem] A blower according to the present invention is fixed to a bottom plate of a blower casing by a blower casing having a motor mounting hole formed in a bottom plate, and a flange provided on the outer periphery and penetrating the motor mounting hole. A motor and a centrifugal blade that is fitted to the rotating shaft of the motor and rotates in the blower casing,
A disk-shaped heat radiating portion is provided on a solid bottom portion between the flange of the motor and the bottom plate so as to maintain a space between the flange and the bottom plate.

Further, a cylindrical heat radiating portion is provided at a fixed portion between the flange of the motor and the bottom plate of the blower casing so as to maintain a space between the flange and the bottom plate.

[Operation] In the present invention, the heat generated from the motor is transferred and diffused evenly by the disk-shaped heat dissipation portion to dissipate the heat uniformly, and a space is provided between the heat dissipation portion and the bottom plate of the blower casing. This increases the heat dissipation area of the heat dissipation unit.

In addition, since the heat radiating portion has a cylindrical shape and a space is provided between the heat radiating portion and the bottom plate, the heat radiating area of the heat radiating portion becomes larger.

[Embodiment] FIG. 1 is a perspective view showing a centrifugal fan according to an embodiment of the present invention. The blower shown in the drawing has a blower casing 3 in which a motor mounting hole 2 is formed in a bottom plate 1, and a motor 4 fitted and fixed in the motor mounting hole 2 of the blower casing 3.
And a sirocco blade 6 that is a centrifugal blade that is fitted in the rotating shaft 5 of the motor 4 and rotates in the blower casing 3, and a disc or a cylindrical shape made of aluminum that is sandwiched between the motor 4 and the blower casing 3. And a heat dissipation member 7 which is a heat dissipation part of the. The outer shell 4a of the motor 4 has a two-divided structure, and has a joint flange 4b protruding in the radial direction on the outer periphery, and the motor 4 is screwed to the blower casing 3 at this joint flange 4b. To attach the motor 4 to the blower casing 3, the joint flange 4b should be inside the blower casing 3, and the heat dissipation member 7 should be sandwiched between the joint flange 4b and the bottom plate 1 of the blower casing 3 and screwed. Done by. If the heat radiation member 7 has an outer diameter larger than the outer diameter of the sirocco blade 6, the air blow during the air blowing operation will directly hit the surface of the heat radiation member 7,
The heat dissipation effect can be improved. 2 and 3 show a structure in which a disk-shaped or cylindrical heat-dissipating member 7 is sandwiched between the joint surfaces of the joint flange 4b of the motor 4, and the bottom plate 1 of the blower casing of the two joint flanges is Since the joint flange 4b 'interposed between the heat dissipation member 7 and the heat dissipation member 7 functions as a spacer, the heat dissipation member 7 and the blower casing 3
A space is formed between the bottom plate 1 and the bottom plate 1 by the thickness of 4b '.
The former transfers heat to the blower casing 3 and blower casing 3
You can also radiate heat from. Further, the latter has a gap with the bottom plate 1 and can radiate heat on substantially the entire surface of the heat radiating member 7.

In any of the blowers described above, the aluminum heat dissipation member 7 is attached only when attaching the motor 4 to the blower casing 3 or when assembling the outer shell 4a of the motor 4, without affecting the overall dimensions of the blower. Outer shell of motor 4
The surface area of 4a can be substantially remarkably increased, and the heat generated by the operation of the motor 4 can be dissipated, resulting in no cost.
Therefore, a fan with smooth heat radiation can be obtained without making the motor 4 open or increasing the size of the motor 4.

Further, in the above-described embodiment, the joint flange and the heat dissipation member are formed as separate bodies, but they may be integrated and the same effect is obtained.

〔The invention's effect〕

As described above, according to the blower of the present invention, a blower casing having a motor mounting hole formed in the bottom plate, a motor penetrating the motor mounting hole and fixed to the bottom plate of the blower casing by a flange provided on the outer periphery, A centrifugal blade that is fitted to the rotation shaft of the motor and rotates in the blower casing is provided, and a disk-shaped heat radiating portion that holds a space between the bottom plate and the fixing portion of the motor flange and the bottom plate is provided. It is provided.

In addition, since a cylindrical heat radiating part is provided in the fixed part between the motor flange and the bottom plate of the blower casing, maintaining a space between it and the bottom plate, the heat from the motor is transferred and diffused evenly. The heat is evenly dissipated, and the heat dissipation area is increased.
The heat dissipation effect is improved.

Further, since the heat radiating portion has a cylindrical shape and a space is provided between the heat radiating portion and the bottom plate, the heat radiating area of the heat radiating portion becomes larger and the heat radiating effect is further improved.

[Brief description of drawings]

1 is a perspective view showing a centrifugal blower according to an embodiment of the present invention with a part thereof broken, FIG. 2 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 3 is another embodiment. It is a longitudinal cross-sectional view showing an example. In the figure, 1 is a bottom plate, 2 is a motor mounting hole, 3 is a blower casing, 4 is a motor, 4a is an outer shell, 4b is a joint flange, 5 is a rotating shaft, 6 is a sirocco blade, 7 is a heat radiating member, and 7a is a cylinder. Reference numeral 8 denotes an axial fan. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (2)

[Claims] 1. A blower casing having a motor mounting hole formed in a bottom plate, a motor fixed to the bottom plate of the blower casing by a flange penetrating the motor mounting hole and provided on an outer periphery, and a rotary shaft of the motor. A centrifugal blade that is fitted and rotates in the blower casing,
A blower characterized in that a disc-shaped heat radiating portion is provided in a fixing portion between the flange of the motor and the bottom plate so as to maintain a space between the flange and the bottom plate. 2. A blower casing having a motor mounting hole formed in a bottom plate, a motor fixed to the bottom plate of the blower casing by a flange penetrating the motor mounting hole and provided on an outer periphery, and a rotary shaft of the motor. A centrifugal blade that is fitted and rotates in the blower casing,
A blower, characterized in that a cylindrical heat radiating portion is provided in a fixing portion between the flange of the motor and the bottom plate so as to maintain a space between the flange and the bottom plate.