JP2005256610A - Intake structure of sirocco fan motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sirocco fan motor capable of obtaining high air quantity characteristics by solving a problem of an intake area in the small sirocco fan motor used for various OA equipment such as a liquid crystal projector. <P>SOLUTION: The sirocco fan motor is composed of a rotor frame 4 having a field magnet inside; a shaft 1 fastened to the center of the rotor frame; a bearing element 2 rotatably supporting the shaft; an annular hub part 6 fixed to the outer peripheral part of the rotor frame 4, and an impeller 7 formed integrally with the hub part; and a casing for storing the impeller and forming an opening on the top face side. A step part is formed on the top face side of the outer peripheral part of the rotor frame, and the hub part is fixed to the step part. An intake part of the sirocco fan is thereby composed of the rotor frame and the casing part 8, so that the area of the intake part can be sufficiently taken. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a sirocco fan motor having high static pressure characteristics while being small and thin, for cooling inside a machine used for various office automation equipment such as a liquid crystal projector.

  Conventionally, a small sirocco fan motor used for various office automation equipment such as a liquid crystal projector is integrated with a rotor frame having a field magnet on the inner periphery, a hub portion press-fitted and held on the outer periphery, and the hub portion through a plurality of stays. Shaped impeller, shaft connected to the center of the rotor frame, a bearing element that rotatably supports the shaft, the bearing element is housed and fixed therein, and a stator is fixed to the outer periphery thereof The sirocco fan intake structure is composed of an opening formed on the top surface of the casing and the hub portion (see, for example, Patent Document 1).

FIG. 3 shows the structure of a conventional sirocco fan motor. In FIG. 3, 12 is a bearing element, 13 is a stator, 18 is a casing, 14 is a rotor frame, 16 is a hub, and 17 is a fan integrally formed with the hub.
Japanese Patent No. 3277641 (Page 5, FIGS. 1 and 2)

  In the conventional configuration described above, the area between the hub portion and the casing is reduced, and when the sirocco fan motor is reduced in thickness, there is a problem that the area of the intake portion cannot be sufficiently obtained.

  The present invention solves such a conventional problem, and provides a small sirocco fan motor that can exhibit a high static pressure characteristic while being small in size because the area of the air intake portion can be sufficient. Objective.

  In order to solve the above problems, the present invention provides a rotor frame having a field magnet therein, a shaft fastened to the center of the rotor frame, a bearing element that rotatably supports the shaft, and an outer periphery of the rotor frame. Sirocco fan motor comprising an annular hub portion fixed to a portion, an impeller molded integrally with the hub portion, and a casing that accommodates the impeller and has an opening formed on the top surface thereof In this embodiment, a step portion is formed on the top surface side of the outer peripheral portion of the rotor frame, and the hub portion is fixed to the step portion.

  According to the first aspect of the present invention, since the air intake portion composed of the opening of the casing portion and the rotor frame is enlarged by the step portion formed on the top surface side of the outer peripheral portion of the rotor frame, the conventional hub Compared with the intake section by the section, a sufficient intake area can be taken, so that a reduction in intake can be eliminated, and an advantageous effect that a sirocco fan with a large air volume can be provided is obtained.

According to a first aspect of the present invention, there is provided a rotor frame having a field magnet therein, a shaft fastened to the center of the rotor frame, a bearing element for rotatably supporting the shaft, and the rotor frame. A sirocco comprising an annular hub portion fixed to the outer peripheral portion, an impeller molded integrally with the hub portion, and a casing which accommodates the impeller and has an opening formed on the top surface side thereof In the fan motor, a sirocco fan motor is characterized in that a step portion is formed on the top surface side of the outer peripheral portion of the rotor frame, and the hub portion is fixed to the step portion. Therefore, it is possible to obtain a small sirocco fan motor that can exhibit high air flow characteristics while being small.

  Embodiments of the present invention will be described below with reference to the drawings.

  1, the present invention includes a rotor frame 4 having a field magnet 5 therein, a shaft 1 fastened to the center of the rotor frame, a bearing element 2 that rotatably supports the shaft, and an outer periphery of the rotor frame. An annular hub portion 6 fixed to the portion, an impeller 7 formed integrally with the hub portion, and a casing 8 which accommodates the impeller and has an opening on the top surface side. In the sirocco fan motor, a step portion is formed on the top surface side of the outer peripheral portion of the rotor frame, and the hub portion is fixed to the step portion.

  With the above configuration, the sirocco fan motor of the present invention has an annular hub portion, so that the intake portion is composed of a rotor frame and a casing portion, so that the area of the intake portion can be taken sufficiently, and the air flow characteristics are small but high The sirocco fan motor having the above can be realized.

  FIG. 2 is an external view of the sirocco fan motor of the present invention.

  Since the sirocco fan motor of the present invention can take a sufficient area of the intake portion and has an advantageous effect of having a high air flow characteristic, various OA devices such as a liquid crystal projector that requires a high static pressure characteristic while being small and thin. It is also useful for in-machine cooling.

Structure diagram of sirocco fan motor according to Embodiment 1 of the present invention 1 is an external view of a sirocco fan motor according to Embodiment 1 of the present invention. Structure of a conventional sirocco fan motor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft 2, 12 Bearing 3, 13 Stator core 4, 14 Rotor frame 5, 15 Field magnet 6, 16 Hub 7, 17 Impeller 8, 18 Casing A
9 Casing B

Claims (1)

A rotor frame having a field magnet therein, a shaft fastened to the center of the rotor frame, a bearing element that rotatably supports the shaft, and an annular hub portion fixed to the outer periphery of the rotor frame; In a sirocco fan motor comprising an impeller formed integrally with the hub portion and a casing that houses the impeller and has an opening formed on the top surface thereof, the top of the outer peripheral portion of the rotor frame A sirocco fan motor characterized in that a step portion is formed on the surface side and the hub portion is fixed to the step portion.

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