JP2005163757A - Electric blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric blower capable of reducing weight of an electric motor part and increasing cooling effect. <P>SOLUTION: This electric blower 1 is provided with the electric motor part 2 composed of a stator 7 having a stator core 10 produced by laminating a plurality of stator core plates 9 like a thin plate having an opening at the center and a rotor supported in the opening of the stator by a rotatable rotor shaft, a substantially cylindrical casing 6 storing the electric motor part, a fan fixed to an end part of the rotor shaft, and a diffuser for leading air stream generated by rotation of the fan into the electric motor part. Single number or a plurality of stator core plates are provided by protruding more than other stator core plates toward an inner peripheral wall of the casing. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electric blower that is provided in a vacuum cleaner or the like and cools a stator and a rotor of an electric motor section by an air flow generated by a blower fan.

  In the conventional electric blower, for example, as shown in FIG. 8, a rotatable rotor shaft 132 is supported on a cylindrical casing body 124 constituting the electric motor, and a blower fan 140 is provided at one end of the rotor shaft 132. A cylindrical rotor magnet 133 is fixed at the center. Around this rotor magnet 133, a stator core 127 is disposed in which a large number of annular silicon steel plates of the same size are stacked in proximity to each other, and a phase winding 128 is wound around a pole inside the rotor magnet 133. . The stator core 127 has a plurality of convex portions 127 a 2 integrally projecting from the outer periphery of the base main portion 127 a 1, and the outer peripheral surface of the convex portion 127 a 2 is in pressure contact with the inner wall of the casing body 124.

  Thus, the rotor 131 is constituted by the rotor shaft 132 and the rotor magnet 133, and the stator 126 is constituted by the pole, the phase winding 128 and the stator core 127. With these configurations, a ventilation path E is provided between the base main portion 127a1 of the stator core 127 and the inner wall of the casing body 124. Airflow from the blower fan 140 flows into the ventilation path E, cools the stator 126 and the rotor 131, and is discharged from the exhaust hole 144 of the casing body 124. (For example, see Patent Document 1)

  Further, in other conventional electric blowers, the airflow generated by the cooling fan is prevented from flowing into the gap between the electric motor frame and the outer periphery of the stator to reduce the cooling effect, and concentrated between the stator and the rotor. In order to guide and cool them efficiently, there is a structure in which a closing plate is installed between the end face of the stator core and the stator winding to close the gap between the motor frame. (For example, see Patent Document 2)

JP-A-8-223890 JP-A-6-213196

  However, in the former prior art, all the steel plates laminated as the stator core of the electric motor have a diameter larger than necessary, so that the electric efficiency is lowered or the stator part of the electric motor is enlarged and the weight is increased. Had. In the latter case, it is necessary to install a separate member closing plate between the end face of the stator core of the motor and the stator winding, so extra materials and man-hours are required, and the cooling effect of the stator is expected. There was a problem that could not be done.

  This invention is made | formed in view of the said situation, Comprising: While reducing an electric motor part, it aims at providing the electric blower which increases a cooling effect.

  The present invention relates to a stator having a stator core in which a thin plate-shaped stator core plate having an opening at the center is laminated, an electric motor part including a rotor supported by a rotatable rotor shaft in the opening of the stator, and housing the electric motor part An electric blower comprising: a substantially cylindrical casing; a blower fan fixed to an end of the rotor shaft; and a diffuser for guiding an airflow generated by the rotation of the blower fan to the electric motor unit. One of the main features is that one or more of them are provided so as to protrude from the other stator core plate toward the inner peripheral wall of the casing.

  The electric blower of the present invention increases the cooling effect by the air flow while reducing the weight of the electric motor by projecting a part of the laminated stator core plate serving as the stator core of the electric motor unit from the outer peripheral part of the other stator core plate. It is a thing.

  Hereinafter, embodiments of the electric blower according to the present invention will be described with reference to FIGS. 1 to 7.

  1 to 4 show sectional views of an electric blower 1 according to an embodiment of the present invention. The electric blower 1 is used for an electric vacuum cleaner or the like. The electric blower 1 is roughly composed of an electric motor unit 2 and a blower unit 3 including a mechanism driven thereby. The electric motor unit 2 includes a substantially cylindrical casing 6 made of metal or synthetic resin and having a small-diameter portion 4 and a large-diameter portion 5, and a stator 7 is accommodated therein.

  As shown in FIG. 3, this stator 7 has a stator core 10 having a circular opening 8 at the center and a stack of dozens of stator core plates 9 each made of a substantially rectangular thin silicon steel plate, It is configured by a pair of semicircular arc field magnets 12 which are fitted into the opening 8 of the stator core 10 and are disposed so as to face each other so as to form a circular rotor accommodating portion 11 at the center. Each of these field magnets 12 has a length equal to the thickness of the stator core 10 on which the stator core plate 9 is laminated. In addition, circular fixing holes 13 are provided at the four corners of each stator core plate 9, and these fixing holes 13 are positioned so as to penetrate the entire stator core 10. The field magnet 12 is not necessary when the stator 7 is provided with an electromagnetic coil.

  Of the stator core plates 9, two of the stator core plates 9 positioned at the end of the stator core 10 are disk-shaped air-cooled stator cores whose outer peripheral portions protrude from the outer peripheral portions of the other stator core plates 9 toward the inner peripheral wall of the casing 6. It is a plate 15. The air-cooled stator core plate 15 has the same material and the same thickness as the other stator core plates 9 constituting the stator core 10, but has a larger diameter in a disc shape than the other stator core plates 9, and the outer peripheral end thereof is the casing 6. It extends to a position near the inner peripheral wall surface of the large diameter portion 5 to form an annular ventilation path 14. The two air-cooled stator core plates 15 can be one or more depending on the thickness or strength thereof.

  Further, the stator 7 is sandwiched between a brush side frame 16 made of synthetic resin and a fan side frame 17 which is also a diffuser, and is integrated or fixed thereto. That is, screw holes 19 are provided in the brush side frame 16 and through holes (not shown) are provided in the fan side frame 17 at positions corresponding to the positions of the fixing holes 13 provided at the four corners of the stator core 10, and the long holes extend from the through holes. After the bolts 21 are inserted and passed through the fixing holes 13 of the stator core 10, the stator cores 10 formed by the stacked stator core plates 9 and air-cooled stator core plates 15 are fixed by screwing into the screw holes 19 of the brush side frame 16. Are integrated and fixed.

  The brush side frame 17 has a bearing support portion 23 at the center of one end thereof, and stores the carbon brush 24 that protrudes outward from the vicinity of the bearing support portion 23 and is pressed toward the center. A pair of brush holders 25 are provided, and the other end side is a core support portion 26 that supports one end of the stator 7. The fan side frame 17 which is also a diffuser is provided with a bearing support portion 27 at the center.

  A rotor 30 is accommodated in a circular rotor accommodating portion 11 at the center of the pair of field magnets 12 of the stator 7. The rotor 30 has a large number of T-shaped arm portions 31 each extending in the radial direction, an amateur core 32 in which several tens of thin silicon steel plates made of the same material as the stator core plate 9 are laminated, and a T-shaped arm portion. The armature coil 34 is wound around 31. The rotor 30 is fixed to a rotor shaft 35 penetrating the center portion, and both end portions 36 of the rotor shaft 35 are respectively provided on the bearing support portions 23 and 27 of the brush side frame 16 and the fan side frame 17. The roller bearings 37 and 38 are rotatably supported.

  At the position of the rotor shaft 35 where the carbon brush 24 accommodated in the brush holder 25 is pressed, a commutator 41 in which a number of commutator pieces 40 are arranged in a cylindrical shape is fixed, and the end of each commutator piece 40 is fixed. The terminal part of the amateur coil 34 is connected to the part.

  A blower fan 42 as a part of the blower unit 3 is fixed to the end opposite to the end of the rotor shaft 35 to which the commutator 41 is fixed. That is, the blower fan 42 is disposed between a disc-shaped front plate 44 having a suction port 43 at the center and a disc-shaped rear plate 45 fixed to the rotor shaft 35 by a nut 33 and a sleeve 39. A plurality of rotor blades 46 are provided so as to be sandwiched and spread in a spiral shape in the radial direction. By rotating the rotary blade 46 as a part of the blower fan 42, a gas such as air sucked from the suction port 43 is released in the outer peripheral direction of the blower fan 42.

  The fan-side frame 17 serving as a diffuser is located between the blower fan 42 and the stator 7, and the blower fan 42 is provided with an air intake 48 close to the outer peripheral portion of the blower fan 42. Yes. Further, on the stator 7 side of the fan-side frame 17, a partition wall 50 that is spirally formed from the outer peripheral portion toward the center portion while protruding in the direction of the air-cooled stator core plate 15 is provided. The flow path 54 is formed. The flow path 54 communicates with each air intake port 48 close to the outer periphery of the blower fan 42. Each partition wall 50 is opened on the air-cooled stator core plate 15 side while maintaining a predetermined distance from the air-cooled stator core plate 15. The fan-side frame 17 may be constituted by a member separate from the diffuser having the air intake port 48, the partition wall 50, and the flow path 54, and these may be integrated later.

  On the outer periphery of the fan side frame 17, a circular inflow port 55 corresponding to the suction port 43 of the blower fan 42 is provided, and an outer periphery of a bowl-shaped fan cover 56 that covers the blower fan 42 is fixed. Further, the outer peripheral end portion of the casing 6 is fixed by screws 58 on the opposite side of the fan side frame 17 from the fan cover 56. The fan side frame 17 is constituted by the fan side frame 17, the blower fan 42 and the fan cover 56. The fan cover 56 can be made unnecessary by making the outer peripheral portion of the blower fan 42 discharge airflow toward the air intake 48 of the fan-side frame 17.

Next, the case where the electric blower 1 of Example 1 is driven will be described.
By supplying electric power to the carbon brush 24 and the amateur coil 34 from the outside, the rotor 30 starts to rotate in a predetermined direction. As a result, air, which is a gas sucked from the suction port 43 by the blower fan 42 fixed to the rotor shaft 35, is discharged to the outer peripheral portion of the blower fan 42 by the fan blades 46. And it flows in from each air inflow port 48 of the fan side flame | frame 17 which is also a diffuser arrange | positioned at an outer peripheral part, passes the flow path 54 of the partition wall 50, respectively, and is sent toward the air-cooled stator core board 15. FIG.

  A part of the airflow that has traveled toward the air-cooled stator core plate 15 flows into the gap between the inner peripheral surface of the stator 7 and the outer peripheral surface of the rotor 30 in the rotor housing portion 11, and the other part of the airflow. The air-cooled stator core plate 15 collides with the air-cooled stator core plate 15, and passes through the ventilation path 14 between the outer peripheral portion of the air-cooled stator core plate 15 and the inner peripheral wall of the casing 6. The stator 7, the rotor 30, the brush holder 25, and the like are cooled by these airflows. In particular, since the heat generated in the stator 7 has a large surface area in contact with the air flow of the air-cooled stator core plate 15 laminated as a part of the stator 7, the cooling effect becomes remarkable, and the field magnet 12 is removed due to the temperature rise. Magnetism can be prevented. In addition, since the air-cooled stator core plate 15 is integrally laminated with the same material as the other stator core plates 9 constituting the stator core 10, it can be easily assembled and can maintain strength. Further, when the stator 7 is formed by integral molding of the stator core 10 and the field magnet 12, it is only necessary to change a part of the mold when it is necessary to change the shape and size of the air-cooled stator core plate 15. This is easier than when the field magnet 12 is embedded in the stator core 10 or when the electromagnetic coil is provided in the stator 7.

  Next, a second embodiment of the present invention will be described with reference to FIGS. In this case, the same parts as those in the first embodiment are indicated by the same numbers. The end portion of the stator core 10 laminated on the fan side frame 17 side is made of two air-cooled stator core plates 60 made of the same material, and the outer peripheral portion of the air-cooled stator core plate 60 is in contact with the inner peripheral surface of the casing 6 and is almost airtight. The dimensions are such that Then, substantially circular ventilation holes 61 are opened at two positions in the middle of the air-cooled stator core plate 60. The ventilation hole 61 is formed by projecting a cut and raised portion 62 that is curved toward the outer peripheral surface of the stator 7 from the fan side frame 17 side to the brush side frame 16 side.

  Next, the operation of the air-cooled stator core plate 60 having such a sealed type provided with the ventilation holes 61 and the cut and raised portions 62 will be described. The air discharged to the outer peripheral portion of the blower fan 42 by the fan blades 46 flows in from the air inlets 48 of the fan-side frame 17, passes through the flow paths 54 formed by the partition walls 50, and moves toward the air-cooled stator core plate 60. Be blown.

  The airflow toward the air-cooled stator core plate 60 flows into the outer periphery of the stator 7 from the two ventilation holes 61, but is intensively blown onto the outer peripheral surface of the stator core 10 due to the presence of the curved cut and raised portion 61. Thereby, in addition to widening the surface area of the air-cooled stator core plate 60, the cooling effect of the stator 7 can be further enhanced. The air-cooled stator core plate 60 is not limited to two, and the same effect can be obtained even if the number of sheets is one, or one or more.

  FIG. 7 shows another embodiment of the present invention. The same parts as those in the second embodiment are indicated by the same reference numerals. In this example, circular through-holes 66 are provided at two locations on a sealed air-cooled stator core 65 plate similar to that of the second embodiment. The airflow passes through the through-hole 66 and flows on the outer periphery of the stator 7, so that an excellent cooling effect can be achieved with a simple structure while increasing the surface area of the air-cooled stator plate 65. Such a through hole 66 can also be provided in the air-cooled stator core plate 15 in which the ventilation path 14 is provided in the outer peripheral portion as in the first embodiment.

  Further, in the first embodiment, the outer peripheral portion of the air-cooled stator core plate 15 is brought into contact with the inner peripheral wall of the casing 6 without providing the ventilation path 14 so that the air-cooled stator core plate 15 is dimensioned to be almost airtight. It is also possible to adopt a structure in which the ventilation hole 61 and the through hole 66 serving as the flow path are not provided. In this case, the gap between the inner peripheral surface of the stator 7 and the outer peripheral surface of the rotor 30 becomes a concentrated air flow path. Also in this structure, the cooling effect of the stator 7 can be increased by increasing the surface area of the air-cooled stator core plate 15.

  In any of the above embodiments, the air-cooled stator core plate protruding outward from the outer peripheral portion of the stator core plate is not necessarily provided at the end of the stator, and is sandwiched between the intermediate portions of the stacked stator core plates. It can also be provided. In addition, the air-cooled stator core plate is not limited to a circular outer peripheral portion, and may be a square or the like according to the shape of the casing of the electric blower.

  Further, the present invention is not limited to a DC commutator electric blower or an AC commutator electric blower, and can be implemented in any electric blower as long as the stator is constituted by a stator core having a stator core plate laminated thereon.

It is sectional drawing of the electric blower of one Example by this invention. (Example 1) It is the top view seen from the brush side frame of the electric blower shown in FIG. It is sectional drawing in AA of the stator and rotor of the electric blower shown in FIG. It is the perspective view which removed the casing, the ventilation fan, and the fan cover of the electric blower shown in FIG. It is a top view which shows the other Example of the electric blower by this invention. (Example 2) It is sectional drawing of the electric blower shown in FIG. It is a top view which shows the other Example of the electric blower by this invention. Example 3 It is sectional drawing which shows the conventional electric blower.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric blower 2 Electric motor part 6 Casing 7 Stator 9 Stator core board 10 Stator core 15, 60, 65 Air-cooled stator core board 16 Brush side frame 17 Diffuser (fan side frame)
30 Rotor 35 Rotor shaft 42 Blower fan

Claims (4)

A stator having a stator core in which a thin plate-shaped stator core plate having an opening at the center is laminated, an electric motor part composed of a rotor supported by a rotor shaft that is rotatable in the opening of the stator, and a substantially cylindrical shape that accommodates the electric motor part In the electric blower comprising: the casing; a blower fan fixed to the end of the rotor shaft; and a diffuser for guiding the airflow generated by the rotation of the blower fan to the electric motor unit.
One or more of the stator core plates are provided so as to protrude from the other stator core plates toward the inner peripheral wall of the casing.   2. The outer peripheral portion of one or more stator core plates provided so as to protrude from another stator core plate toward the inner peripheral wall of the casing is in contact with the inner peripheral wall of the casing. Electric blower.   A through hole is provided in a part of one or a plurality of stator core plates provided so as to protrude from the other stator core plate toward the inner peripheral wall of the casing, thereby providing a ventilation path for an air flow generated by the blower fan. The electric blower according to claim 1 or claim 2.   2. A stator core plate or a plurality of stator core plates provided so as to protrude from another stator core plate toward the inner peripheral wall of the casing is provided at the end of the stator as a stator core plate closest to the blower fan. The electric blower according to claim 3.

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