JPH0727090A - Motor built-in type blower device - Google Patents

Abstract

PURPOSE:To uniformly provide a generating condition of a magnetic field by making a slit part in a fan boss part agree with a different pole boundary part of a plurality of permanent magnets. CONSTITUTION:In a sheet metal integral type propeller fan having a blade part 1 and a fan boss part 2 formed by folding a sheet metal bent, a drive motor is constituted by making a slit part 4, formed in the fan boss part 2, agree with a different pole boundary part 6 of a plurality of permanent magnets 5 mounted on the inside of the fan boss part 2, to form a cylindrical rotor of the motor, and also by accomodating a stator, provided in a casing side, in the inside of the rotor.

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 an indoor unit of an air conditioner, for example, and more specifically, a blower driving motor is built in the blower to reduce the number of parts and reduce the weight. The present invention relates to a blower device with a built-in motor that can achieve the above.

[0002]

2. Description of the Related Art At present, various blowers are used in air conditioners, range hoods, wind fans, circulation, air purifiers and the like. In such a blower, since the blower fan and the motor for driving the fan are separately constructed and assembled, the motor portion is projected from the fan, or the motor provided so as to be projected from the fan is housed. Therefore, it is necessary to provide a space for housing the motor 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, the motor part may interfere with other equipment when it is attached to the electric equipment as described above, which makes the electric equipment compact. I couldn't.

In order to solve such a problem, an actual exploitation method 6
In Japanese Patent 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 blades are arranged in a cylindrical shape, and a support mounted with a stator and the end plate are provided with a shaft at central portions thereof. A so-called air blower with a built-in motor is proposed. In this blower, the blower can be downsized and unitized by the above-described configuration.

[0004]

However, if the above-mentioned structure of the blower is applied to a propeller fan formed by bending a sheet metal, the following problems will occur. 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. Then, ignoring this slit and forming the motor-integrated fan as described above,
Depending on how the permanent magnets are attached to the fan boss, the magnetic field is not uniformly generated, which causes a problem that the rotation of the motor is uneven.

In order to solve the above-mentioned problems, the present invention is formed in a fan-boss portion and a magnetic pole boundary portion of a permanent magnet attached to a fan boss portion in a sheet metal integrated propeller fan with a built-in motor. It is an object of the present invention to propose a blower device with a built-in motor that can evenly generate a magnetic field by matching the slit part with the slit part.

[0006]

Therefore, the present invention is directed to a sheet metal integrated propeller fan having a blade boss formed by bending a sheet metal and a fan boss, and a slit formed in the fan boss and the fan boss. The rotor of the cylindrical motor is formed by matching the boundaries of the different poles of the magnets installed inside the rotor, and the stator provided on the casing side is built into the rotor to form the drive motor. This is characterized by the above, and this is used as a means for solving the problem.

[0007]

In the rotor side and the stator side of the motor, as shown in FIG. 7, the stator 13 is inserted and fitted inside the permanent magnet (rotor) mounted on the inner surface of the boss portion of the propeller fan. Then, the tip of the shaft 9 and the bottom surface of the propeller fan boss are prevented from coming off, and a propeller fan with a built-in motor is assembled. At this time, the different poles of the magnet 5 (N
A permanent magnet is attached inside the boss so that the boundary portion 6 of the pole and the S pole and the slit 4 portion coincide with each other. By doing so, it is possible to make the generation state of the magnetic field uniform and improve the rotation performance of the fan.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view showing a punched state of a sheet metal 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.
Is a plan view showing a state in which a plurality of permanent magnets are attached inside the 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 assembled state.

In FIG. 1, 1 is a blade of a propeller fan,
2 is a boss portion of the propeller fan, 3 is a bottom plate of the propeller fan boss portion, and these are formed by punching out one sheet metal as shown in the figure.

The sheet metal punched out as shown in FIG. 1 is bent into a propeller fan as shown in FIG. 2 through a plurality of bending steps. At this time, as shown in FIG. 2, a slit 4 is formed in the propeller fan boss portion. When the different pole boundary portion of the permanent magnet 5 on the rotor side of the motor is arranged ignoring the slit 4, the slit 4 portion causes nonuniformity in the magnetic field. Therefore, in the present invention, as shown in FIG. 3, the permanent magnet is mounted inside the boss so that the boundary portion 6 between the N pole and the S pole of the permanent magnet 5 and the slit 4 portion are aligned with each other. A bearing cylinder, which will be described later, is attached to the boss bottom plate 3 of the propeller fan bent in this way by an appropriate means such as caulking, and the 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 side of the stator having the structure described later.

The magnet mounted inside the boss may be a rotor in which a plurality of different pole magnets are alternately and continuously attached by an adhesive or the like as shown in FIG. 3, but a magnetic material (for example, a plastic magnet or a rubber magnet). , Sintered magnets, etc.) may be alternately magnetized with S poles and N poles to form a rotor (a 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 portion formed on the boss and the boundary portion between the S pole and the N pole always match.

A method of magnetizing will be described with reference to FIGS. FIG. 5 is a schematic view of a method of fixing a magnet material to a rotor case that also serves as a propeller fan boss portion by an appropriate means, and then magnetizing the magnet material with a required magnetic force. A magnetic material 5 is attached. The method described in Japanese Utility Model Publication No. 48-38733 is used to attach the magnetic material 5 to the inner surface of the boss. At the center of this magnetic material, a magnetizing yoke serving as a stator of the motor is arranged so that the slit portion formed on the boss and the boundary portion between the S pole and the N pole coincide with each other. When a current is passed through 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. So that the boundary portion 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 shown in Japanese Patent Publication No. 53-40002.

When the magnetic material is attached to the inner surface of the boss portion with an adhesive, in order to make the boundary portion 6 between the S pole and the N pole coincide with the slit, a guide pin or a positioning pin is used for the boundary. Match the part and the slit. When a magnetized magnet is used, marking is made on the boundary line with an oil-based pen or the like, and the marking is attached so that the marking and the slit match.

On the other hand, the structure of the stator side of the motor 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 and mounted on the outer periphery of the tubular support 12. A shaft 9 is attached to the center of the tubular support 12, and a propeller fan boss is attached to the shaft 9.

As to the rotor side and the stator side of the motor constructed as described above, as shown in FIG. 7, the inside of the permanent magnet 5 (rotor) in which the stator 13 is attached to the inner surface of the boss portion of the propeller fan. The shaft 9 and the bottom surface of the propeller fan boss are prevented from coming off in this state, and a propeller fan with a built-in motor is assembled. At this time, the sheet metal propeller fan boss also serves as the motor casing. In the figure, 15 is a motor control board.

In the air blower thus constructed, the 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, the wind flows in the W direction in a small size. You can get a fan.
By the way, in the case of the above-mentioned embodiment, since the wind flows in the propeller fan boss portion, dust may flow into the motor, but in order to avoid this, as shown in FIGS. It is also possible to reverse the twist of the fan blades 1'to allow the wind to flow along the outer circumference of the propeller fan boss. In the figure, 2'denotes a boss portion of the propeller fan, and 3'denotes a bottom plate of the propeller fan boss portion. In this case, since air flows around the boss portion, a cooling effect of the motor can be obtained.

The above embodiment is merely an example of the present invention, and the number of blades of the fan can be increased or decreased, or the boss portion can be provided with steps, which correspond to the purpose of using the blower. Various design changes are possible. When the number of blades of the fan is increased or decreased, the slits on the boss side and the N pole and S pole of the magnet attached to the inner surface of the boss must be arranged so as to coincide with each other. Furthermore, the present invention can be embodied in various forms without departing from the spirit or the main feature of the present invention. Therefore, the above-mentioned embodiments are merely exemplifications in all respects, and should not be construed as restrictive. .

[0018]

As described above in detail, in the blower according to the present invention, the motor is built in the boss portion of the propeller fan, and the boundary between the permanent magnet on the rotor side of the motor and the S pole and the N pole. Since the portion is arranged so as to match the slit portion formed in the propeller fan boss portion, it is possible to provide a small motor built-in air blower device that can make the generation state of the magnetic field uniform and has good rotation performance. An excellent effect can be achieved.

[Brief description of drawings]

FIG. 1 is a plan view showing a punched state of a sheet metal when a blower according to an embodiment of the present invention is formed.

FIG. 2 is a side view showing a state where a propeller fan is formed by bending FIG.

FIG. 3 is a plan view showing a state in which a plurality of permanent magnets are attached inside the boss of the propeller fan formed by bending as shown in FIG.

4 is a cross-sectional view taken along the line AA in FIG.

FIG. 5 is a schematic view showing a method for magnetizing a magnetic body incorporated inside a boss.

FIG. 6 is a perspective view showing a state in which a magnetic body is magnetized.

FIG. 7 is a cross-sectional view showing a state where a motor is incorporated inside a boss.

FIG. 8 is a plan view showing a punched state of a sheet metal when forming a blower device according to another embodiment of the present invention.

FIG. 9 is a side view showing a state where the propeller fan is formed by bending FIG. 8;

[Explanation of symbols]

 1 Wing part 2 Boss part 3 Bottom part 4 Slit 5 Permanent magnet 6 Boundary part of 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.

Claims (1)

[Claims] 1. A sheet metal type integral propeller fan having a blade portion and a fan boss portion formed by bending a sheet metal, comprising:
The slit portion formed in the fan boss portion and the boundary portion between the different poles of the magnets mounted inside the fan boss portion are matched to form a rotor of the cylindrical motor, and the rotor is provided inside the rotor on the casing side. A blower device with a built-in motor, characterized in that a drive motor is configured by incorporating the provided stator therein.