JP2748763B2 - Blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower used for cooling various equipment such as OA equipment.

[0002]

2. Description of the Related Art Conventionally, this type of blower is
For example, the configuration is as shown in Japanese Utility Model Publication No. 62-6316. That is, as shown in FIG. 6, an impeller 23 provided with a blade boss 22 that covers one side of the motor body 20 is attached to the output shaft 21 of the motor body 20.
The impeller 23 has a shaft mounting boss formed at the center of a blade boss 22 coupled to the blade, and a plurality of suction blades 24 radially protruding toward the center are formed on the inner periphery of the blade boss 22 in a rib shape. I have. The motor body 20 is provided with ventilation holes on both sides so that air can flow through the inside.

[0003] In the blower having the above structure, the blade boss 22 covers one side of the motor body 20 to prevent dust from entering. Further, the suction blades 24 protruding from the inner periphery of the blade boss 22 rotate with the rotation of the impeller 23 to form a cooling air flow by the suction air flow, so that heat accompanying the operation of the motor can be radiated.

[0004]

In the above-described conventional blower, the motor can be cooled by the suction blades 24 provided on the blade bosses 22. However, in the case of a blower using an outer rotor type motor in which the rotor rotates outside the stator. In the blower by the outer rotor type motor which cannot be applied and is widely adopted in OA equipment etc. in response to the demand for overall miniaturization,
Only a cooling means which can be said to be classical in which a motor is placed in an air passage and heat is radiated in an outer shell is employed. Also, O
Outer rotor type motor in response to miniaturization of A equipment
When trying to reduce the size of the blower used, the stator winding
There is a problem that the degree of freedom of specification is limited. That is,
Increase or decrease the number of windings to control the number of revolutions (air flow).
Or reduce the number of windings in order to reduce the thickness
Or between the winding and the inner surface of the blade, for example,
The axial gap must be reduced.

[0005] The present invention is to reduce the size of the outer rotor type motor for the blower with respect to the number of windings.
Simple configuration that can be propelled without impairing the degree of freedom
The purpose is to establish cooling technology .

[0006]

SUMMARY OF THE INVENTION The blower according to the present invention, constitute a stator on the outer periphery of the bearing holder for accommodating a bearing for rotatably holding the rotary shaft, formed by constituting the rotor outside the stator motor main body covers the outer peripheral portion of the one side and the rotor of the motor body, Oite the blower <br/> machine is mounted on a rotary shaft and a rotor made of these with co-rotation to the impeller, b over data of the rotor yoke constituting the outer peripheral portion constitutes a cylindrical body, the inner diameter of the vane bosses covering the outer periphery of the impeller of the rotor constitute a larger diameter than the rotor yoke, the inner periphery of the inner blade boss rotor yoke on the peripheral of the blade boss a plurality of retaining ribs projecting radially to hold while maintaining a constant distance to the plane provided for the rotor yoke per the one axial end of the rotor yoke to the back side of the holding ribs Niwaso this to the blade hub Fitting Forward in the rotational direction of the impeller defining a depth
The pedestal to be removed from the position facing the winding of the stator.
Shaft insertion boss formed on the body, and fitting the rotary shaft of the impeller
A plurality of ribs are integrally formed radially on the base portion of .

[0007]

In the blower according to the present invention, the rotor is attached to the blade boss by the holding rib, and the rotor, the impeller and the rotating shaft rotate integrally to perform the blowing function. A predetermined distance is maintained between the inner peripheral surface of the impeller boss and the outer peripheral surface of the rotor yoke in the impeller, and a distance between the one axial end of the rotor and the side surface of the impeller is also maintained by the pedestal. . The rotor yoke is hollow and open at both ends in a cylindrical body, and communicates with the space at each of the above-mentioned intervals. Therefore,
When the impeller rotates, the air in the motor body is stirred by the rotation of the rib of the shaft insertion boss, and at the same time, by the rotation of the pedestal,
An airflow is generated from inside the motor body to the outside from between the rotor yoke and the blade boss via the gap between the pedestals. Soshi
The pedestal is provided at the position facing the winding of the stator.
The gap in this part is secured, and the number of turns
Is secured.

[0008]

FIG. 1 is a sectional view showing a blower as one embodiment of the present invention, with a part thereof omitted. FIG. 2 is a rear view of the impeller, and FIG. 3 is an internal structure of the impeller. 4 and 5 are enlarged perspective views of a shaft mounting portion of the impeller.

The motor body 1 of the blower shown has a stator 4 on the outer periphery of a bearing holder 3 containing a bearing that rotatably holds a rotating shaft 2 at the center, and a rotor 5 on the outside of the stator 4. Become. The impeller 6 is a plastic molded body, which covers one side in the axial direction of the motor main body 1 and the outer peripheral portion of the rotor 5, and is mounted on the rotating shaft 2 and the rotor 5,
It goes around with these. The outer periphery of the rotor 5 is constituted by a rotor yoke 7, and the rotor yoke 7 is constituted by a hollow cylindrical body having both ends opened. The outer periphery of the rotor 5 is covered with a blade boss 9 that supports the blade 8,
The inner diameter of the blade boss 9 is larger than the outer diameter of the rotor yoke 7. One side of the blade boss 9 is connected to a side plate 10 covering one side of the motor body 1, and a shaft insertion boss 11 to be fitted to the rotary shaft 2 is formed integrally with the center of the side plate 10. The rotor yoke 7 is provided around the inner periphery of the blade boss 9.
A plurality of radially protruding holding ribs 12 for holding the inner peripheral surface at a constant interval are formed integrally.
One end of the rotor yoke 7 contacts the back side of each holding rib 12 that is the side plate portion side, and the blade boss 9 of the rotor yoke 7
A pedestal 13 for defining a fitting depth into the pedestal 13 is formed. Each pedestal 13 is formed in a form advanced in the rotation direction of the impeller 6 and protrudes toward the center side from the holding rib 12, but the position facing the winding of the stator 4 is off.
A rib 14 as shown in FIGS. 4 and 5 is integrally formed on the outer periphery of the shaft insertion boss 11 in a radial manner.

In the blower having the above configuration, the impeller 6
Is fitted to the rotating shaft 2 at the shaft inserting boss 11,
By assembling the rotor 5 with the holding ribs 12 in the blade boss 9, the rotor 5, the impeller 6, and the rotating shaft 2 rotate integrally with respect to the stator 4 to perform a blowing function.
Inner peripheral surface of blade boss 9 in rotor 6 and rotor yoke 7
A predetermined interval is maintained between the outer peripheral surface of the rotor yoke and the inner surface of the side plate portion 10 of the impeller 6 by maintaining a predetermined interval between the axial end of the rotor yoke 7 and the inner surface of the side plate portion 10. I have. The rotor yoke 7 is a cylindrical body with both ends open, and the space at each of the above-mentioned intervals communicates with the internal space. Therefore, when the impeller 6 rotates, the air in the motor main body 1 is agitated by the rotation of the rib 14 of the shaft insertion boss 11, and at the same time, the rotation of the pedestal 13 that advances in the rotation direction causes
The air in the motor body 1 is sucked into the gap between the pedestals 13 and discharged outside from between the rotor yoke 7 and the blade boss 9. That is, an air flow for cooling the inside of the motor body 1 is formed as shown by the arrow in the drawing, and the inside of the motor is actively cooled. The ribs 14 of the shaft insertion boss 11 function to agitate air and promote cooling at the same time as reinforcement of the portion. The pedestal 13 is located at a position facing the winding of the stator 4.
The gap is secured in this area
Thus, the degree of freedom for the number of turns of the winding is ensured. That is,
Not only promotes cooling inside the motor body 1 but also
Degree of freedom for the same winding specifications
Thus, downsizing of the motor can be achieved.

[0011]

As is apparent from the above description of the embodiment, according to the present invention, the inside of the motor is cooled by utilizing the holding structure of the impeller for holding the rotor yoke and the rib for reinforcing the shaft insertion boss. Agitating air flow
Active cooling to a motor of the blower according to the outer rotor type motor without a significant change in the overall structure are possible with intensity up of the impeller, moreover Mo
Flexibility in the winding specifications of the
In this case, downsizing of the motor can be achieved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention, in which a part of a blower is omitted.

FIG. 2 is a rear view of the impeller showing the embodiment of the present invention.

FIG. 3 is a partial perspective view of an impeller showing an embodiment of the present invention.

FIG. 4 is a perspective view of a shaft insertion boss portion of an impeller showing an embodiment of the present invention.

FIG. 5 is a perspective view of a shaft insertion boss portion of the impeller showing the embodiment of the present invention.

FIG. 6 is an explanatory view showing a conventional blower.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Motor main body 2 Rotating shaft 3 Bearing holder 4 Stator 5 Rotor 6 Impeller 7 Rotor yoke 9 Blade boss 11 Shaft insertion boss 12 Holding rib 13 Base 14 Rib

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuhide Naito 1-3-3 Komabacho, Nakatsugawa City, Gifu Prefecture Mitsubishi Electric Corporation Nakatsugawa Works (72) Kikuo Komiyama 1-3-3 Komabacho, Nakatsugawa City, Gifu Mitsubishi (72) Inventor Toshihiko Uchida 1-3-3 Komaba-cho, Nakatsugawa City, Gifu Prefecture Mitsubishi Electric Corporation Nakatsugawa Works (56) References JP-A-2-86997 (JP, A) JP Sho 61-1897 (JP, A) Real opening Sho 62-74195 (JP, U)

Claims (1)

(57) [Claims] 1. A motor body having a stator on the outer periphery of a bearing holder for accommodating a bearing for rotatably holding a rotating shaft, a motor body comprising a rotor outside the stator, one side of the motor body and a rotor. And a rotor yoke constituting an outer peripheral portion of the rotor is formed in a cylindrical body, and a rotor of the impeller is formed of a rotary body and an impeller mounted on the rotor and co-rotating therewith. The inner diameter of the blade boss that covers the outer periphery of the rotor boss is made larger than the rotor yoke, and a plurality of radially projecting radially holding the rotor yoke at a constant interval with respect to the inner peripheral surface of the blade boss are formed on the inner periphery of the blade boss. And an impeller for defining the fitting depth of the rotor yoke to the blade boss by contacting one of the axial ends of the rotor yoke on the back side of each of the holding ribs. The base to be forward in the rotational direction, the
Remove the position facing the winding of the stator and form it integrally,
A blower, wherein a plurality of ribs are integrally formed radially on a base of a shaft insertion boss on which a rotary shaft of the impeller is fitted.