JP4851791B2 - Electric blower - Google Patents

Description

  The present invention relates to an electric blower including a rotor support plate that is disposed between a rectifying plate and a motor and supports a rotor.

  Conventionally, for example, an electric blower used for a vacuum cleaner or the like includes a substantially cylindrical case body that houses a motor having a rotating shaft to which a centrifugal fan is attached, and a centrifugal fan is provided between the motor and the centrifugal fan. A rectifying plate that rectifies the blown air in a spiral shape in the direction of the central axis on the motor side is provided. In this rectifying plate, a plurality of front blades and a plurality of rear blades as fixed blades are projected in a spiral shape on the centrifugal fan side and the motor side, respectively, between the front blades and the rear blades. In addition, a front guide air passage and a rear guide air passage for guiding the air blown out from the centrifugal fan are respectively defined.

Further, a frame as a rotor support plate that supports the rotor of the motor is disposed between the rectifying plate and the motor in a bridge shape over the radial direction of the case body. At both ends of the frame, screw fixing portions that are screwed to the peripheral edge portion of the case body are provided (see, for example, Patent Document 1 and Patent Document 2).
JP-A-9-209987 (page 4-5, FIG. 4-5) Japanese Patent Laid-Open No. 9-209989 (5th page, FIG. 5-6)

  However, in the above-described electric blower, the screw that screws the frame to the case body with the screwing portion protrudes into the rear guide air passage of the rectifying plate, so that the screw passes through the rear guide air passage. There is a problem that turbulent flow is generated in the air blown out from the centrifugal fan, and it is not easy to ensure the blowing efficiency.

  This invention is made | formed in view of such a point, and it aims at providing the electric blower which improved ventilation efficiency.

The present invention includes a substantially cylindrical case body that includes a support portion and an anti-rotation portion on an inner peripheral portion and accommodates a motor, a centrifugal fan provided on one end side of a rotating shaft, and a space between the centrifugal fan and the motor. is disposed, a rectifying plate which the air blown from the centrifugal fan to rectify to the motor side, is formed in the longitudinal shape along the radial direction of the case body is inserted along the inner peripheral surface of the case body supporting portion A fixed portion that is supported and fixed by both sides and is restricted from rotating in the circumferential direction by contacting both sides of the rotation preventing portion is provided at both ends, and is disposed between the rectifying plate and the motor. A rotor support plate that supports the rotating shaft of the rotor with the case body is provided.

According to the present invention, the fixing portion of the rotor support plate is inserted and fixed along the inner peripheral surface of the case body , supported by the support portion, and both sides thereof are brought into contact with the rotation prevention portion. By restricting the rotation in the circumferential direction , for example, a screw for fixing the rotor support plate to the periphery of the case body does not protrude toward the rectifying plate, and the turbulent flow of air rectified by the rectifying plate In addition to improving the blowing efficiency and supporting each fixed portion of the rotor support plate by the support portion of the inner peripheral portion of the case body, by bringing both sides of the fixed portion into contact with the rotation prevention portion, The rotor support plate can be easily and reliably positioned, the assembly accuracy and the position accuracy of the rotor support plate can be improved, and the performance can be improved, and the productivity is improved .

  Hereinafter, the configuration of an electric blower according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  FIG. 2 shows an electric blower 1, and this electric blower 1 is used, for example, in a vacuum cleaner (not shown) or an industrial blower. In the electric blower 1, a motor 2 is disposed in a substantially bottomed cylindrical main body case 3, and is rotated outside the main body case 3 by a rectifying current plate 4 and a motor 2. The centrifugal fan 5 is sequentially attached from the motor 2 side, and the centrifugal fan 5 is covered with a fan cover 6.

  In the following description, the motor 2 side is the rear side and the fan cover 6 side is the front side.

  The motor 2 has a rotating shaft 11 disposed along the central axis of the main body case 3, and a commutator 12 as a cylindrical commutator and an armature as a rotor on the outer peripheral surface of the rotating shaft 11. The armature 13 is integrally provided, and further, a stator 14 as a stator is disposed around the armature 13, and carbon brush assemblies 15 and 15 as a pair of brush mechanisms are attached. .

  The rotary shaft 11 has a front end portion that is the other end portion in the axial direction inserted through the rectifying plate 4, and a centrifugal fan 5 is attached to the front end portion.

  The commutator 12 has conductivity, and the tip ends of the carbon brush assemblies 15 and 15 are in sliding contact with the outer peripheral surface.

  The stator 14 has a square plate-like stator core 21 in plan view in which a large number of iron plates are stacked, and a substantially square insertion hole 22 into which the armature 13 is inserted is formed at the center of the stator core 21. The insertion hole portion 22 has an inner peripheral portion facing the outer peripheral surface of the armature 13 with a predetermined gap. A plurality of fixed poles, that is, an N pole and an S pole are formed on the inner peripheral portion of the stator core 21.

  Each carbon brush assembly 15 is fixed by inserting a tip portion into a pair of brush portion mounting holes 24 (only one is shown) formed in the main body case 3. Each carbon brush assembly 15 is provided in a carbon brush 25, a brush holder 26 that holds the carbon brush 25, a spring 27 as an urging member accommodated in the brush holder 26, and the brush holder 26. And a terminal 28.

  The carbon brush 25 has one end portion in the longitudinal direction protruding from the brush holder 26 in the direction of the central axis of the main body case 3 to be in sliding contact with the outer peripheral surface of the commutator 12 and being electrically connected to the commutator 12, and the other end in the longitudinal direction. The part is inserted into the brush holder 26.

  The brush holder 26 has one end portion in the longitudinal direction of the carbon brush 25 inserted into the brush portion mounting hole 24, and the other end portion in the longitudinal direction protrudes outward from the main body case 3.

  The spring 27 presses the carbon brush 25 against the outer peripheral surface of the commutator 12.

  The terminal 28 protrudes from the other end of the brush holder 26 in the longitudinal direction, and is electrically connected to a household commercial AC power source or a power source unit (not shown) such as a battery.

  The main body case 3 includes a body frame 31 as a substantially bottomed cylindrical case body, and a frame 32 as a rotor support plate inserted and fixed from the front end portion of the body frame 31 to support the armature 13 in the axial direction. have.

  The body frame 31 is provided with a cylindrical motor head portion 34 protruding rearward at the rear end surface, ie, the center of the bottom surface, which is one end in the axial direction. An opening 35 into which the frame 32 is inserted is formed at the front end portion of the body frame 31, and a flange portion 36 to which the fan cover 6 is fixed projects from the peripheral portion of the opening 35. Yes. Further, on the outer peripheral surface near the front end portion of the body frame 31, a pair of brush portion mounting holes 24 (only one is shown) to which the carbon brush assemblies 15 and 15 are respectively attached, and air blown from the centrifugal fan 5 are externally provided. A plurality of square-hole-shaped exhaust ports 38 for exhausting air are respectively formed.

  A pair of support portions 39 (only one is shown) for supporting the inserted frame 32 are cut and raised on the side portion of the body frame 31.

  The motor head portion 34 is provided with a bearing 41 as a bearing that is press-fitted and rotatably supported by a rear end portion that is one end portion of the rotating shaft 11 of the motor 2 in the axial direction. A thrust spring 43 for applying a preload to the bearing 41 is accommodated in the rear part of the bearing 41.

  Each brush portion mounting hole 24 is provided through the body frame 31 in the central axis direction.

  Each support portion 39 serves as a stopper for positioning the frame 32 in the axial direction with respect to the fuselage frame 31, and protrudes stepwise toward the front side at a position substantially symmetrical to the radial direction of the fuselage frame 31. For example, a punch is used.

  On the other hand, as shown in FIGS. 1 and 2, the frame 32 includes a frame main body 45 that is formed in a longitudinal shape, and a fixing portion 46 that is integrally bent at both ends of the frame main body 45.

  The frame main body 45 is formed with a mounting recess 47 at the center, and is inclined from the mounting recess 47 to the fixing portions 46 at both ends, opposite to the protruding direction of the mounting recess 47. The frame main body 45 is formed with a pair of rectifying plate screw retaining holes 48 and 48 for screwing the rectifying plate 4 around the mounting recess 47. Further, reinforcing ribs 51 (only one is shown) are formed on both sides of the frame main body 45 so as to be bent substantially perpendicularly to the opposite side of the mounting recess 47 in the protruding direction.

  The mounting recess 47 has a bearing 53 that is rotatably supported by press-fitting a front end portion that is the other end portion in the axial direction of the rotating shaft 11 of the motor 2, and an outer peripheral portion of the mounting recess 47. Is inserted. A projecting hole 54 through which the rotating shaft 11 projects forward is formed in the center of the bottom of the mounting recess 47.

  Screws 56 (only one is shown) are inserted through the current plate screwing holes 48 and 48.

  Each fixing portion 46 is bent at both end portions of the frame main body 45 in a rib shape substantially perpendicular to the frame main body 45. Further, a contact surface 46 a that is formed in an arc shape corresponding to the inner peripheral shape of the fuselage frame 31 and is in contact with the inner peripheral surface of the fuselage frame 31 is formed on the outside of the fixing portion 46. The rear end part which is a front-end | tip part is each supported by the support part 39 by press-fitting in the circumferential side.

  Each fixing portion 46 is guided in its press-fitting direction by a pair of guide portions 58 provided on the body frame 31 when the frame 32 is press-fit into the body frame 31.

  Here, the guide portion 58 is, for example, a groove portion formed linearly along the axial direction from the opening portion 35 to each support portion 39 in the inner peripheral portion of the body frame 31, and approximately the width of each fixing portion 46. It is formed in equal width. Further, both side surfaces of the guide portions 58 are provided with a rotation preventing portion 59 that prevents rotation of the frame 32 in the circumferential direction by contacting both side surfaces of the fixing portions 46 in a state where the fixing portions 46 are fitted. It has become. Further, the curved peripheral surfaces of the guide portions 58 serve as the body side contact surface 60 with which the contact surface 46a of the fixed portion 46 contacts.

  The frame 32 may be inserted along the inner peripheral surface of the fuselage frame 31 and fixed by screwing or the like from the side without pressing the fixing portions 46 into the inner peripheral side of the fuselage frame 31. The fixing method is not particularly limited.

  The rectifying plate 4 is also called a diffuser and rectifies the air blown from the centrifugal fan 5 and flows it to the motor 2 side. The rectifying plate 4 is located between the motor 2 and the centrifugal fan 5 and It is attached to close the front end. The rectifying plate 4 includes a disc-shaped rectifying plate main body 63, a plurality of front blades 64 and a plurality of rear blades 65 as fixed wings protruding from the rectifying plate main body 63. .

  The rectifying plate main body 63 is provided coaxially with the central axis of the main body case 3, and a concave portion 67 projecting toward the motor 2 is provided at the central portion, and an attachment concave portion 47 of the frame 32 is provided at the central portion of the concave portion 67. An insertion hole 68 through which the screw 56 is inserted is formed, and a screw hole 69 through which the screw 56 is screwed is formed around the insertion hole 68.

  The front blade 64 protrudes from the current plate main body 63 to the front side, and is provided on the outer peripheral edge portion of the current plate main body 63 in a plane spiral shape toward the outer circumferential direction, and is separated from each other in the circumferential direction of the current plate main body 63 Has been. For this reason, between the front blades 64, a front guide air passage 71 that is continuous with the outer periphery of the current plate main body 63 is defined. The front guide air passage 71 guides the air blown from the centrifugal fan 5 in a spiral manner from the rotating shaft 11 side to the outer peripheral direction. Further, the front blades 64 are located outside the outer periphery of the centrifugal fan 5 and face the outer periphery of the centrifugal fan 5.

  The rear blade 65 protrudes from the current plate main body 63 to the rear side, and is provided in a plane spiral shape in the opposite direction to the front blade 64 so as to go from the center side to the outer peripheral direction. Are spaced apart from each other in the direction. For this reason, a rear guide air passage 73 is formed between the rear blades 65 so as to be continuous with the outer peripheral portion of the current plate main body 63. The rear guide air passage 73 communicates with the front guide air passage 71 at the outer peripheral edge of the rectifying plate main body 63, and the suction air guided in the outer peripheral direction by the front guide air passage 71 is used as the rear of the rectifying plate 4. It is guided in a spiral manner toward the rotary shaft 11 on the side, and is formed to face the front side of the flange portion 36 of the body frame 31.

  Further, the front guide air passage 71 and the rear guide air passage 73 communicate with each other through a communication notch (not shown) formed in the outer peripheral edge of the rectifying plate 4.

  Returning to FIG. 2, the centrifugal fan 5 rotates integrally with the rotating shaft 11 of the motor 2, and includes a rear shroud 75 provided in a disk shape, a front shroud 76 positioned in front of the rear shroud 75, In addition, a fan blade 77 provided integrally between the shrouds 75 and 76 is provided.

  The rear shroud 75 is formed with a fitting insertion hole 81 into which the rotating shaft 11 of the motor 2 is fitted. Further, the rear shroud 75 is sandwiched forward and backward by an annular rear fan washer 83 and a front fan washer 84 through which the rotary shaft 11 is inserted. The front fan washer 84 is fixed to the front end side of the rotating shaft 11 by a nut 85.

  On the other hand, the front shroud 76 is formed with a round hole-shaped ventilation hole 87 at the center, and the diameter of the ventilation hole 87 is increased from the periphery of the ventilation hole 87 toward the rear shroud 75 in an inclined manner.

  The fan blades 77 are provided in a plane spiral shape in a direction opposite to the front blade 64 of the rectifying plate 4 so as to extend from the vicinity of the peripheral edge of the ventilation hole 87 toward the outer periphery of the centrifugal fan 5 in plan view. It is formed in a wall shape that defines 88. These intake air passages 88 communicate with the front guide air passage 71 of the rectifying plate 4.

  The fan cover 6 has a rear end portion fitted to the outer peripheral edge portion of the flange portion 36 of the body frame 31. Further, the fan cover 6 has a round hole-like suction port 89 formed in the center of the front surface. Further, a seal member 90 is provided on the outer peripheral edge portion of the suction port 89 on the rear surface of the fan cover 6 so that the peripheral edge portion of the ventilation hole 87 of the centrifugal fan 5 is in sliding contact with the suction hole 89 in an airtight manner. It is attached.

  Next, the operation of the above embodiment will be described.

  When assembling the electric blower 1, the motor 2 is housed in the body frame 31 of the main body case 3, and the carbon brush assemblies 15, 15 are attached to the brush part mounting holes 24 from the outside of the body frame 31, and then the motor The frame 32 and the rectifying plate 4 are sequentially inserted in front of the second rotating shaft 11.

  At this time, the frame 32 fits each fixing portion 46 to the guide portion 58, and press-fits in the axial direction of the body frame 31 along the guide portion 58 until the tip end abuts on each support portion 39. The contact surface 46a of the portion 46 is held in sliding contact with the body-side contact surface 60 of the guide portion 58.

  Thereafter, the centrifugal fan 5 is attached to the rotating shaft 11 protruding to the front side of the rectifying plate 4 via the fan washers 83 and 84, and is fastened and fixed with nuts 85, and the fan cover 6 is attached to the front side of the body frame 31.

  Then, when the motor 2 is driven by supplying power to the terminal 28 and the rotating shaft 11 rotates integrally with the centrifugal fan 5, the electric blower 1 is driven by the negative pressure generated by the rotation of the centrifugal fan 5. Air is sucked into the electric blower 1 from the suction port 89. The sucked air flows into the intake air passage 88 of the centrifugal fan 5 through the ventilation holes 87 and is then blown out along the fan blades 77 toward the outer periphery of the centrifugal fan 5.

  The air blown out from the centrifugal fan 5 flows into the front guide air passage 71 of the rectifying plate 4 and is spirally guided along the front blade 64 from the central axis side to the outer peripheral direction on the front side of the rectifying plate 4. After that, the air flows into the rear guide air passage 73 from the outer peripheral portion of the rectifying plate 4 through a notch (not shown).

  At this time, since there are no protrusions such as screws in the rear guide air passage 73, air passes smoothly.

  Then, the rear surface side of the rectifying plate 4 is spirally guided from the outer peripheral side toward the central axis along the rear blade 65 to be statically pressurized, and the opening 35 of the body frame 31 passes through both sides of the frame 32. From the exhaust port 38 to the outside of the electric blower 1 while cooling the stator 14 and cooling the carbon brush 25 of the carbon brush assembly 15. Is done.

  As described above, according to the above-described embodiment, the fixing portions 46 of the frame 32 are inserted and fixed along the inner peripheral surface of the fuselage frame 31, so that, for example, both ends of the frame are connected to the fuselage frame. Compared to the conventional case where screws are fixed to the flange portion, the screws or the like may protrude to the rear guide air passage side of the rectifying plate, or the thickness of both ends of the frame may protrude to the rear guide air passage. In addition, the turbulent flow of the air rectified by the rectifying plate 4 can be suppressed by suppressing the air path resistance, the air blowing efficiency can be improved, and the wind noise can be suppressed to reduce the noise.

  Further, by providing a support portion 39 for supporting each fixing portion 46 of the frame 32 on the inner peripheral portion of the fuselage frame 31, the frame 32 can be reliably supported by the fuselage frame 31, and at the time of manufacture, the fixing portion If the frame 32 is inserted into the fuselage frame 31 until the tip of the 46 hits the support portion 39, the frame 32 can be easily and reliably positioned without considering the insertion depth of the frame 32 into the fuselage frame 31, and the like. The assembly accuracy of the blower 1 and the positional accuracy of the frame 32 can be improved to improve the performance of the electric blower 1, and the productivity is improved.

  Further, the guide portions 58 provided on the fuselage frame 31 guide each fixing portion 46 of the frame 32 in the insertion direction, thereby facilitating the mounting of the frame 32 and the assembly accuracy of the electric blower 1 and the frame 32. As a result, the positional accuracy of the electric blower 1 can be suppressed, and variations in performance of the electric blower 1 can be suppressed.

  Similarly, by preventing the rotation of the frame 32 in the circumferential direction by the rotation preventing portion 59 provided on the body frame 31, the assembly accuracy of the electric blower 1 and the positional accuracy of the frame 32 are further improved, and the electric blower 1 Variation in performance can be suppressed and manufacturability is further improved.

  In addition, by forming the guide portion 58 in the shape of a groove, both side surfaces of the guide portion 58 become the rotation prevention portion 59, so that the productivity is better than when the rotation prevention portion is provided separately from the guide portion. become.

  Then, by providing a curved contact surface 46a along the shape of the inner peripheral surface of the fuselage frame 31 on the outer periphery of each fixed portion 46 of the frame 32, a guide portion that is the inner peripheral surface of the frame 32 and the fuselage frame 31. The contact area between the 58 and the body-side contact surface 60 can be increased, and the frame 32 can be more securely fixed to the body frame 31.

  In the above embodiment, the shapes of the support portion 39, the guide portion 58, and the rotation prevention portion 59 can be arbitrarily set.

  Moreover, the detail of the electric blower 1 is not limited to the said structure.

  Furthermore, the electric blower 1 can be applied to various things besides a vacuum cleaner and an industrial blower.

It is a disassembled perspective view which shows the case body and rotor support plate of the electric blower of one embodiment of this invention. It is a longitudinal cross-sectional view which shows an electric blower same as the above.

Explanation of symbols

1 Electric blower 2 Motor 4 Rectifying plate 5 Centrifugal fan
11 Rotation axis
13 Armature as a rotor
31 Body frame as a case body
32 Frame as rotor support plate
39 Support
46 Fixed part
58 Guide section
59 Anti-rotation part

Claims (2)

A motor including a rotor having a rotation shaft;
A substantially cylindrical case body that includes a support portion and a rotation prevention portion on the inner peripheral portion and accommodates the motor;
A centrifugal fan provided on one end of the rotating shaft;
A rectifying plate that is disposed between the centrifugal fan and the motor and rectifies air blown from the centrifugal fan toward the motor;
It is formed in a longitudinal shape along the radial direction of the case body, is inserted along the inner peripheral surface of the case body, is supported and fixed by the support portion, and both sides abut against the rotation prevention portion. Fixed portions that restrict rotation of the case body in the circumferential direction are provided at both ends , and are arranged between the rectifying plate and the motor to support the rotating shaft of the rotor between the case body. An electric blower comprising: a rotor support plate . Case body, the electric blower of claim 1 wherein characterized in that it comprises on the inner periphery of the guide portion for guiding the fixing portion of the rotor supporting plate in the insertion direction.

Images