JPH087813Y2 - Electric blower - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electric blower built in a main body for use in dust suction of an electric vacuum cleaner used at home, for example.

2. Description of the Related Art In this type of conventional electric fan,
It was constructed as described in the publication. That is, the manufacturing cost is reduced by shallowly drawing the anti-load side bracket and directly fixing the bracket to the field core.

However, in recent years, in order to further reduce the material cost, the width required to hold the bearing for supporting the rotation of the armature 2 at the rear side of the anti-load side bracket 1 as shown in FIG. In this case, the one formed by the method described above and fixed to the field core 3 in a cross-linked manner has come to be used.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In this configuration, however, the temperature rise of the armature winding and the field winding 4 is increased from the load side bracket 5 to the rear end of the anti-load side bracket 1 and the field iron core 3 and the counter side. Even if the outer periphery of the load-side bracket 1 is covered with the semi-air-permeable soundproof plate 6, most of the air discharged from the load-side bracket 5 and the outer periphery of the field core 3 or the anti-load-side bracket 1 and the soundproof plate 6 Since it is discharged to the rear of the electric blower 7 through the space, there is a problem that the effect of cooling the armature winding and the field winding 4 becomes insufficient and the safety limit is exceeded.

The present invention aims to solve the above problems and provide a cheaper electric blower.

Means for Solving the Problems In order to solve the above problems, according to the present invention, a load side bracket is fixed to one of the field cores whose outer surfaces are exposed, and an anti-load side bracket is fixed to the other side. In an electric blower in which a fan, an air guide, a fan case, and the like are attached to the tip of the fan, and air is discharged from the fan to the field core side, a rib is provided on the field core side of the air guide. And a rib extending toward the center of the field iron core, and a part of the exhaust air discharged from the air blower by the rib is used to rotate the armature and the field magnet in the center of the field iron core. This is forcibly flowing into the space formed between the core and the iron core.

Action This action allows the part of the exhaust air that is made to flow between the field iron core and the armature by the ribs to cool the field and armature, and to keep the temperature of the armature winding and field winding safe. It will be reduced within the limit.

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

1 to 3, the electric blower 21 is a motor 22,
It is formed by stacking an air guide 23, a fan 24, and a fan case 25. The electric motor 22 includes a bracket A26 for fixing the air guide 23, a field iron core 27, a bracket B28, and an armature 29. The armature 29 is rotatably supported at the central portion of the field iron core 27 by bearings held by the bracket A26 and the bracket B28. Field iron core 27 and armature
A field space 30 is formed between the 29 and at a position facing each other. Reference numeral 31 is a field winding wound around a field iron core, and 32 is an armature winding wound around the armature 29.

33 and 34 are ribs A and B formed on the bracket A26 side of the air guide 23, which face the field space 30, and
It is formed so as to protrude toward the bracket A26 side so as to follow the narrowed shape of A26 while keeping a slight gap.

 Next, the operation of this configuration will be described.

When the electric blower 21 is energized, the armature 29 rotates, the fan 24 rotates, and air flows in from the front of the fan case 25. This air passes through the fan case 25, enters the central portion of the fan 24, and is discharged to the bracket A26 side through the through hole 35 provided in the outer periphery of the air guide 23. Most of the air is discharged from the opening 36 of the bracket A26 to the outer peripheral side of the field iron core 27, but the separation surface of the air guide 23, rib A33, rib B34, bracket
The air discharged into the space formed by A26 goes toward the inner peripheral side along the ribs A33, B34, flows through the field space 30, and flows toward the bracket B28 side. At this time, the armature winding 32 and the field winding 31 are cooled. This cooling effect is rib A33, rib B3
If there is no 4, the air that has passed through the air guide 23
Since it is blown out in the outer peripheral direction by the rotation of 4, it flows along the peripheral edge of the bracket A26 and is discharged from the opening 36. As a result, the temperature rises when there is no action of cooling the armature winding 32 and the field winding 31. It is possible to obtain the experimental result that it is reduced by about 8 degrees compared with the value.

Further, as a result, the bracket B28 can be made smaller than in the past to save the material and to provide an inexpensive electric blower.

As described above, according to the present invention, in order to forcibly discharge the air from the air blower between the armature and the field core, the rib is protruded from the air guide and the rib is inserted into the field core. Although it is extended to the center side of the, the simple structure such as devising the rib shape in this way allows air to flow efficiently into the space between the armature and the field core where the temperature easily rises. , Which can dramatically improve the cooling effect of the field winding and the armature winding, and eventually can reduce the size of the bracket on the anti-load side and rationalize the design, thereby reducing the price of the electric blower. Is. In addition, the remaining air discharged from the air blower cools the outer surface of the exposed field core, and since the field core is exposed, the pressure loss when injecting the exhaust air from the air blower increases. Moreover, the field winding and the armature winding can be efficiently cooled.

[Brief description of drawings]

1 is an exploded perspective view of an electric blower according to an embodiment of the present invention, and FIG. 2 is a partially cutaway side view of the electric blower.
FIG. 3 is a front view of the electric motor, and FIG. 4 is a partially cutaway exploded perspective view of a conventional electric blower. 23 …… air guide, 26 …… bracket, 27 …… field iron core, 29 …… armature, 31 …… field winding, 33, 34 …… rib.

Claims (1)

[Scope of utility model registration request] 1. A blower comprising a fan, an air guide, a fan case, and the like at the tip of the load side bracket, wherein the load side bracket is fixed to one of the field cores whose outer surface is exposed, and the other side is fixed to the other side. Is attached,
In an electric blower in which air is discharged to the field core side from the blower, a rib is projected on the field core side of the air guide, and the rib is extended to the center side of the field core. An electric blower in which a part of the exhaust air exhausted from the air blower by the ribs is forced to flow into a space formed between the armature rotating in the central portion of the field iron core and the field iron core.