JP3446965B2 - Blower with built-in motor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower for use in, for example, an indoor unit of an air conditioner, and more particularly to a blower driving motor built in a blower. The present invention relates to a motor-incorporated blower that can reduce the number of parts and reduce the weight. [0002] At present, various blowers are used for air conditioners, range hoods, wind fans, circulation, air purifiers and the like. Such a blower has a structure in which a blower fan and a motor for driving the fan are separately formed and assembled, so that a motor portion protrudes from the fan or houses a motor provided to protrude from the fan. Therefore, it is necessary to provide a motor housing space in the fan casing, and it is difficult to reduce the size of the blower. Furthermore, in a blower in which the motor is protruding from the blower, if the motor is to be mounted on the above-described electric device, the motor part may interfere with other devices, and as a result, the electric device may be made compact. I couldn't. In order to solve such a problem, Japanese Utility Model Application
In Japanese Patent Application Laid-Open No. 1-294193, a rotor mounting portion is formed on an end plate of a blower blade in which a large number of wing pieces are arranged in a cylindrical shape, and a support body on which a stator is mounted and the end plate are connected to each other at a central portion by a shaft. A so-called built-in motor-type air blower connected by the above has been proposed. In this blower, the size and size of the blower can be reduced by the above configuration. [0004] However, if the above-described configuration of the blower is applied to a propeller fan formed by bending a sheet metal, the following problems arise. That is, in the sheet metal type integrated propeller fan, when the sheet metal is bent to form the fan, a slit is formed when the propeller is bent and formed on the fan boss portion. And ignoring this slit, if a motor-integrated fan as described above is formed,
Depending on how the permanent magnet is attached to the fan boss, the situation of the generation of the magnetic field becomes non-uniform, causing a problem that the rotation of the motor becomes uneven. In order to solve the above-mentioned problems, the present invention provides a sheet-metal integrated propeller fan with a built-in motor, which is formed at a magnetic pole boundary portion of a permanent magnet attached to a fan boss portion and at the fan boss portion. It is an object of the present invention to propose a blower with a built-in motor that can make the state of generation of a magnetic field uniform by matching with a slit portion. SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a sheet metal integrated propeller fan having a wing portion formed by bending a sheet metal and a fan boss portion, and a slit formed in the fan boss portion. Drive is performed by forming a rotor of a cylindrical motor by matching a boundary portion of a different polarity of a magnet attached to the inside of the fan boss portion, and incorporating a stator provided on a casing side inside the rotor. The present invention is characterized in that a motor is configured, and this is a means for solving the problem. The rotor side and the stator side of the motor are, as shown in FIG. 7, a stator 13 inserted and fitted inside a permanent magnet (rotor) mounted on the inner surface of the boss portion of the propeller fan. In this state, the tip of the shaft 9 and the bottom surface of the boss of the propeller fan are prevented from coming off, and the propeller fan with a built-in motor is assembled. At this time, the different polarity (N
The permanent magnet is mounted inside the boss so that the boundary 6 between the pole and the S pole coincides with the slit 4. By doing so, the magnetic field generation state can be made uniform, and the rotational performance of the fan can be improved. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a sheet metal punching state when forming a blower according to an embodiment of the present invention. FIG. 2 is a side view showing a state where a propeller fan is formed by folding FIG. 1.
Is a plan view showing a state in which a plurality of permanent magnets are mounted inside a boss of a propeller fan formed by bending as shown in the figure, FIG. 4 is a sectional view taken along the line AA in FIG. 3, and FIG. It is sectional drawing of the state which incorporated. In FIG. 1, reference numeral 1 denotes a wing of a propeller fan,
Reference numeral 2 denotes a boss portion of the propeller fan, and 3 denotes a bottom plate of the boss portion of the propeller fan. These are formed by stamping one sheet metal as shown in the figure. The sheet metal stamped as shown in FIG. 1 undergoes a plurality of bending steps to be bent into a propeller fan as shown in FIG. At this time, a slit 4 is formed in the propeller fan boss as shown in FIG. If the different pole boundary of the permanent magnet 5 on the rotor side of the motor is disregarded ignoring the slit 4, the nonuniform magnetic field is generated by the slit 4. Therefore, in the present invention, as shown in FIG. 3, the permanent magnet is mounted inside the boss such that the boundary 6 between the N pole and the S pole of the permanent magnet 5 and the slit 4 are aligned. A bearing cylinder, which will be described later, is attached to the boss bottom plate 3 of the propeller fan thus formed by bending or the like, and a shaft is fitted to the bearing cylinder. The shaft is rotatably attached via a bearing to the center of the bearing of the coil on the stator side, which will be described later. As the magnet mounted inside the boss, as shown in FIG. 3, a plurality of different-polarity magnets may be alternately and continuously attached with an adhesive or the like to form a rotor, but a magnetic material (eg, a plastic magnet, a rubber magnet) may be used. , A sintered magnet, etc.), the S pole and the N pole may be alternately magnetized to form a rotor (the magnetizing method will be described later). In this case,
With the cylindrical magnetic material attached inside the boss, it is necessary to magnetize so that the slit formed in the boss and the boundary between the S pole and the N pole always coincide. The method of magnetizing will be described with reference to FIGS. FIG. 5 is a schematic diagram of a method of fixing a magnet material to a rotor case also serving as a propeller fan boss portion by appropriate means, and thereafter magnetizing a required magnetic force to the magnet material. A magnetic material 5 is attached. In addition, the method described in Japanese Utility Model Publication No. 48-87733 is used to attach the magnetic material 5 to the inner surface of the boss portion. A magnetized yoke serving as a stator of the motor is disposed at the center of the magnetic material so that the slit formed in the boss and the boundary between the S pole and the N pole match. When a current is applied to the coil of the magnetizing yoke arranged in this way, a magnetic flux 7 is generated, and the magnetic material is magnetized corresponding to the N and S poles of the magnetizing yoke, as shown in FIG. Thus, the boundary 6 between the S pole and the N pole is located at the position corresponding to the slit.
Will match. A similar magnetizing method as described above is also disclosed in Japanese Patent Publication No. 53-44002. When the magnetic material is attached to the inner surface of the boss with an adhesive, the boundary 6 between the S pole and the N pole is aligned with the slit by using a guide pin or a positioning pin. Align the part with the slit. When a magnetized magnet is used, marking is performed on the boundary line with an oil-based pen or the like, and the marking is attached so that the marking matches the slit. On the other hand, the structure of the motor on the stator side will be described with reference to FIG. A tubular support 12 is attached to a casing 11 of the blower, and a motor stator 13 is fitted around the outer periphery of the tubular support 12. A shaft 9 is attached to the center of the cylindrical support 12, and a propeller fan boss is attached to the shaft 9. As shown in FIG. 7, the rotor side and the stator side of the motor constructed as described above are arranged such that the stator 13 is located inside the permanent magnet 5 (rotor) mounted on the inner surface of the boss of the propeller fan. In this state, the tip of the shaft 9 and the bottom surface of the propeller fan boss are prevented from coming off, and the propeller fan with a built-in motor is assembled. At this time, the sheet metal propeller fan boss also serves as a motor casing. In the figure, reference numeral 15 denotes a motor control board. In the blower thus constructed, a motor is built in the boss portion of the propeller fan, and when the propeller fan rotates in the R direction shown in FIG. 2, a small wind flows in the W direction. You can get a fan.
By the way, in the case of the above-described embodiment, since wind flows in the direction of flowing into the propeller fan boss portion, it is conceivable that dust may flow into the motor. To avoid this, however, as shown in FIGS. The twist of the fan wing 1 ′ may be reversed so that the wind flows along the outer periphery of the propeller fan boss. In the figure, reference numeral 2 'denotes a boss portion of the propeller fan, and 3' denotes a bottom plate of the boss portion of the propeller fan. In this case, since the wind flows around the outer periphery of the boss portion, a motor cooling effect can be obtained. The above embodiment is merely an example of the present invention, and the number of blades of a fan can be increased or decreased, or a step can be provided in a boss portion. Various design changes are possible. When increasing or decreasing the number of fan blades, the fan must be arranged so that the slit on the boss side and the boundary between the N pole and the S pole of the magnet attached to the inner surface of the boss coincide. Furthermore, the present invention may be embodied in various other forms without departing from the spirit or main characteristics of the present invention, so that the above-described embodiments are merely illustrative in all respects and should not be construed as limiting. . As described above in detail, the blower according to the present invention has a motor built in the boss portion of the propeller fan, and the S pole and the N pole of the permanent magnet on the rotor side of the motor. To provide a small motor built-in air blower with good rotation performance because the boundary between the fan and the slit is formed so as to coincide with the slit formed in the propeller fan boss. The excellent effect that can be performed can be exhibited.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a sheet metal punching state when forming a blower according to an embodiment of the present invention. FIG. 2 is a side view showing a state where a propeller fan is formed by bending FIG. 1; FIG. 3 is a plan view showing a state in which a plurality of permanent magnets are mounted inside a boss of a propeller fan formed by bending as shown in FIG. 2; FIG. 4 is a sectional view taken along the line AA in FIG. FIG. 5 is a schematic view showing a method for magnetizing a magnetic body incorporated in a boss. FIG. 6 is a perspective view showing a state where the magnetic body is magnetized. FIG. 7 is a cross-sectional view showing a state where the motor is incorporated inside the boss. FIG. 8 is a plan view showing a sheet metal punching state when forming a blower according to another embodiment of the present invention. FIG. 9 is a side view showing a state where a propeller fan is formed by bending FIG. 8; [Description of Signs] 1 Wing 2 Boss 3 Bottom 4 Slit 5 Permanent magnet 6 Boundary between S pole and N pole

Continuation of the front page (72) Inventor Yuji Endo 2-499 Aioi-cho, Kiryu-shi, Gunma Akaishi Metal Industry Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) F04D 25/08 305 F04D 29 / 38 F04D 29/34 F04D 29/32

Claims (1)

(1) A sheet metal integrated propeller fan having a wing portion and a fan boss portion formed by bending a sheet metal.
A slit formed in the fan boss is aligned with a boundary of a different pole of a magnet attached to the inside of the fan boss to form a rotor of a cylindrical motor, and a casing is formed inside the rotor inside the rotor. A blower with a built-in motor, wherein a drive motor is configured by incorporating the provided stator.