JP2005264882A - Blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blower with an impeller capable of being reliably and accurately mounted on the rotating shaft of an outer-rotor type motor with a less number of parts. <P>SOLUTION: The impeller 18 being rotated by the outer-rotor type motor 30 sucks gas from a suction port 14 of a casing 12 in the axial direction and exhausts it to a blow-out port 16 in the outer peripheral direction. The impeller 18 is fixed to an upper face 55 of a cup rotor 54 located on the outer periphery side of a stator 36. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a blower such as a turbo fan device or a sirocco fan device.

  A turbofan device or a sirocco fan device is used as a blower for combustion gas of a boiler (see, for example, Patent Document 1).

In such a blower, an inner rotor type motor in which the rotor rotates on the inner peripheral side of the stator or an outer rotor type motor in which the rotor rotates on the outer peripheral side of the stator is used.
JP-A-7-004382

  In the blower, regardless of whether the motor is an inner rotor type or an outer rotor type, the impeller is directly attached to the rotating shaft of the motor. In this mounting structure, a male screw is cut at the end of the rotating shaft, a washer is screwed into the male screw portion, a hole is made, an impeller is attached at that portion, and a nut is tightened.

  The above mounting structure has a problem that the number of parts increases and a compact design cannot be performed.

  In addition, since the impeller is supported only by the rotation shaft, there is a problem that the strength of the rotation shaft is lowered and vibration is generated.

  Furthermore, when the processing accuracy of the rotating shaft is poor, there is a problem that the mounting of the impeller is distorted.

  Therefore, in view of the above problems, the present invention provides a blower capable of mounting an impeller reliably and accurately on a rotating shaft of an outer rotor type motor so that the number of parts is small.

  According to the first aspect of the present invention, an impeller coupled to a rotating shaft of a motor is disposed inside the casing, a suction port is opened on the upper surface of the casing, a blower outlet is opened on a side surface thereof, and the lower surface of the casing is In the blower in which the motor is arranged and the impeller rotated by the motor sucks gas in the axial direction from the suction port and discharges it to the outlet in the outer peripheral direction, the motor is cupped on the outer peripheral side of the stator. It is an outer rotor type motor in which a rotor of a shape is arranged, and it is a blower characterized by having the impeller attached to the upper surface of the rotor.

  According to a second aspect of the present invention, the motor cover of the motor is fixed to the lower surface of the casing, the stator is fixed to the motor cover, and the rotating shaft rotates via a bearing on the inner peripheral side of the stator. The blower according to claim 1, wherein the blower is provided freely and the rotor is attached to the rotating shaft.

  According to a third aspect of the present invention, the motor cover of the motor is cup-shaped, the upper surface of the motor cover has an opening, and the upper surface of the cup-shaped rotor is exposed from the opening of the motor cover. The blower according to claim 1, wherein the peripheral wall of the rotor is housed in the motor cover, and the peripheral wall of the motor cover and the peripheral wall of the rotor are close to each other.

  According to a fourth aspect of the present invention, the motor cover of the motor comprises a cup-shaped cover main body and a lid that closes the opened upper surface of the cover main body, and an opening opens at the center of the lid, The upper surface of the cup-shaped rotor is exposed from the opening of the lid, the peripheral wall of the rotor is housed in the cover body, and the edge of the opening is folded back into the motor cover to form a flange portion. The blower according to claim 1, wherein the flange portion and the peripheral wall of the rotor are close to each other.

  The invention according to claim 5 is characterized in that the lower surface of the casing is opened, and the rotor exposed from the opening of the motor cover is accommodated in the casing from the opened lower surface. It is a blower of Claim 3.

  In the blower of the invention according to claim 1, since the impeller is attached to the upper surface of the cup-shaped rotor, the impeller can be securely attached to the rotor, and a load is applied to the rotating shaft. And no vibration occurs.

  In the blower of the invention according to claim 2, since the rotating shaft is rotatably attached to the inner peripheral side of the stator via a bearing, the rotating shaft does not cause shaft runout with respect to the stator.

  In the blower of the invention according to claim 3, since the peripheral wall of the rotor is housed in the motor cover and the peripheral wall of the motor cover and the peripheral wall of the rotor are in close proximity, the hermeticity in the motor cover is improved. And the motor cover can be formed compactly.

  In the blower of the invention according to claim 4, the edge of the opening portion of the lid of the motor cover is folded back into the motor cover to form a flange portion, and the peripheral wall of the cup-shaped rotor is formed in the opening portion. Is stored and close to each other, so that the airtightness in the motor cover can be improved, and the motor cover can be formed compactly.

  In the air blower of the invention which concerns on Claim 5, since the upper surface of a rotor is the state accommodated in the casing inside, it becomes a compact size as the whole air blower.

[First Embodiment]
Hereinafter, a blower 10 according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  FIG. 1 is a longitudinal sectional view of the blower 10, and FIG. 2 is a plan view of the blower 10.

  The casing 12 of the blower 10 has a shape that forms a cochlear shell-like scroll, and is formed of an upper surface and side walls. A circular suction port 14 for sucking gas is opened at the center of the upper surface of the casing 12, and the inner edge portion thereof is folded to form a bell mouth. Moreover, the blower outlet 16 is formed in the edge part of the surrounding wall extended in scroll shape. A lower surface of the casing 12 is opened, and an outer edge portion thereof is folded outward to form a flange portion 28.

  An impeller 18 is rotatably housed inside the casing 12. In the impeller 18, a plurality of blades 24 are arranged between a ring-shaped shroud 20 and a disk-shaped support plate 22. A conical base 26 is formed at the center of the support plate 22 so as to protrude inside the impeller 18.

  A motor 30 is disposed below the casing 12. The motor 30 is an outer rotor type brushless DC motor.

  The motor cover 32 of the motor 30 includes a cup-shaped cover body 33 and a lid 35.

  A cylindrical body 34 projects in the axial direction at the center of the bottom surface of the cover body 33. A stator 36 is fitted on the outer periphery of the cylindrical body 34. In the stator 36, a stator winding 40 is wound around each tooth of a stator core 38 in which ring-shaped steel plates are laminated. A ring-shaped wiring board 42 is attached below the stator 36, that is, on the bottom surface of the cover main body 35. The wiring board 42 is provided with a drive circuit for driving the motor 30, and a bushing 44 on which a lead wire for connecting to an external control device is projected from an end of the wiring board 42. The bushing 44 is made of synthetic resin or rubber, and is exposed from the peripheral surface of the cover main body 33.

  On the inner peripheral side of the cylindrical body 34, a rotating shaft 50 is held in the axial direction so as to be rotatable via a bearing 48. A male screw portion 52 is provided at the upper end portion of the rotating shaft 50, and a cup-shaped rotor 54 is attached to the male screw portion 52. That is, the center of the upper surface 55 of the cup-shaped rotor 54 bulges upward to form a boss 56, and a female screw portion is provided on the lower surface side of the boss 56, and screwed with the male screw portion 52 of the rotary shaft 50. Match. Further, on the inner peripheral side of the peripheral wall portion 59 of the cup-shaped rotor 54, S-pole and N-pole arc-shaped magnets 60 are alternately arranged so as to face the stator 36.

  A circular opening 46 is formed at the center of the lid 35 of the motor cover 32, and the upper surface 55 of the rotor 54 protrudes from the opening 46. An inner edge portion of the opening 46 is folded downward, that is, inside the cover main body 33 to form a flange portion 62. A gap of about 3 mm is formed so that the flange portion 62 and the peripheral wall portion 59 of the rotor 54 are opposed to each other.

  The support plate 22 of the impeller 18 described above is attached to the upper surface 55 of the rotor 54. That is, the conical base 26 of the support plate 22 is fitted into the boss 56 of the rotor 54 so as to be fitted and fixed by the screws 64. A rubber washer 70 for vibration isolation is provided between the upper surface 55 of the rotor 54 and the lower surface of the support plate 22 of the impeller 18.

  A flange portion 66 is also formed on the outer peripheral portion of the upper surface of the cover main body 33, and is joined to the flange portion 28 of the casing 12 and fixed by screws 68. The motor cover 32 and the casing 12 are fixed.

  In the blower 10 having the above-described configuration, when the rotor 54 is rotated by a control signal from the outside, the impeller 18 is rotated at the same time, and gas is sucked from the suction port 14 and discharged from the blower port 16.

  In this case, since the impeller 18 is attached to the upper surface 55 of the rotor 54, the number of parts to be attached can be reduced, and since the load is not directly applied to the rotary shaft 50, the strength of the rotary shaft 50 is reduced. Can be improved.

  With the impeller 18 attached to the motor 30, the balance of rotation can be corrected.

  Since the upper surface 55 of the rotor 54 is housed under the casing 12, the length of the blower 10 in the axial direction can be reduced, and the blower 10 can be designed in a compact manner.

  The edge of the opening 46 of the lid 35 of the motor cover 32 is folded back to form the flange 62, and the motor cover 32 is sealed with respect to the casing 12 by being close to the rotor 54. Explosion-proof property can be improved when used as a blower for a water heater. That is, even if the wiring board 42 is provided inside the motor cover 32, explosion-proofing can be performed due to its sealing property.

[Second Embodiment]
Hereinafter, the air blower 10 of the 2nd Embodiment of this invention is demonstrated based on FIG.

  The difference between the present embodiment and the first embodiment is the structure of the motor cover 32. In the motor cover 32 of this embodiment, the cover 35 is not provided, and a clearance of about 3 mm is formed so that the peripheral surface 33a of the cover main body 33 faces the peripheral wall portion 59 of the rotor 54 and close to each other. Has been.

  Even in this embodiment, the inside of the motor cover 32 can be sealed with respect to the casing 12, and the explosion-proof property can be enhanced when used as a blower for a hot water heater. That is, even if the wiring board 42 is provided inside the motor cover 32, explosion-proofing can be performed due to its sealing property.

  INDUSTRIAL APPLICABILITY The present invention is suitable as a blower for a hot water heater, a ventilation fan under a floor of a house, and a blower for a washing / drying machine.

It is a longitudinal cross-sectional view of the air blower which shows the 1st Embodiment of this invention. It is a top view of an air blower similarly. It is a longitudinal cross-sectional view of the air blower which shows the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Blower 12 Casing 14 Inlet 16 Outlet 18 Impeller 30 Motor 32 Motor cover 36 Stator 42 Wiring board 44 Bushing 46 Opening 48 Bearing 50 Rotating shaft 54 Rotor 55 Upper surface of rotor 59 Rotor peripheral wall 62 Flange Part

Claims (5)

An impeller connected to the rotating shaft of the motor is arranged inside the casing, a suction port is opened on the upper surface of the casing, and a blower port is opened on the side surface thereof.
The motor is arranged on the lower surface of the casing,
In the blower in which the impeller rotated by the motor sucks gas in the axial direction from the suction port and discharges the gas to the outlet in the outer circumferential direction.
The motor is an outer rotor type motor in which a cup-shaped rotor is arranged on the outer peripheral side of the stator;
The blower, wherein the impeller is attached to an upper surface of the rotor. The motor cover of the motor is fixed to the lower surface of the casing,
The stator is fixed to the motor cover;
The rotating shaft is rotatably provided on the inner peripheral side of the stator via a bearing,
The blower according to claim 1, wherein the rotor is attached to the rotating shaft. The motor cover of the motor is cup-shaped, and the upper surface of the motor cover has an opening.
The upper surface of the cup-shaped rotor is exposed from the opening of the motor cover, and the peripheral wall of the rotor is housed in the motor cover,
The blower according to claim 1, wherein the peripheral wall of the motor cover and the peripheral wall of the rotor are close to each other. The motor cover of the motor is composed of a cup-shaped cover body and a lid that closes the opened upper surface of the cover body.
The upper surface of the cup-shaped rotor is exposed from the opening of the lid, and the peripheral wall of the rotor is housed in the cover body.
An edge of the opening is folded back into the motor cover to form a flange,
The blower according to claim 1, wherein the flange portion and the peripheral wall of the rotor are close to each other. The lower surface of the casing opens,
The blower according to claim 3 or 4, wherein the rotor exposed from the opening of the lid of the motor cover is accommodated in the casing from the opened lower surface.

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