JP4874786B2 - Electric blower and vacuum cleaner - Google Patents

Description

  The present invention relates to an electric blower having an exhaust port provided in a substantially bottomed cylindrical case body and a vacuum cleaner provided with the same.

Conventionally, in this type of electric blower, a motor that is an electric motor is coaxially accommodated in a substantially bottomed cylindrical case body. A centrifugal fan is attached to the tip of the rotating shaft of the motor and can be rotated by the motor. A plurality of exhaust ports through which air sucked into the case body by the rotation of the centrifugal fan is exhausted are provided on the outer peripheral surface of the case body (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 03-286730 (page 3, FIG. 1)

  However, in the electric blower described above, since the exhaust port is provided on the outer peripheral surface of the case body, the air sucked along the axial direction into the case body by the rotation of the centrifugal fan is exhausted while being bent in the case body. Therefore, there is a problem that turbulent flow is generated in the case body and there is a risk of generating noise such as wind noise.

  This invention is made | formed in view of such a point, and it aims at providing the electric blower which improved the silence, and a vacuum cleaner provided with the same.

The present invention includes a motor that have a rotation axis, is formed substantially in a bottomed cylindrical shape, and a case body that houses the motor and axially supports the end portion of the rotary shaft inside the bottom, the other end of the rotary shaft provided on the side, and a plurality of exhaust ports provided respectively located around the hand rotating shaft to the bottom of the centrifugal fan and the case body to suck air into the rotated case body by the electric motor, these exhaust ports And a rib provided over the entire circumference.

According to the present invention, by providing a plurality of exhaust ports to a position around the hand rotating shaft to the bottom of the substantially bottomed cylindrical case body for supporting one end portion of the rotary shaft of the electric motor, the motor rotation shaft of the The air sucked into the case body by the centrifugal fan provided on the other end side flows in a straight line along the axial direction of the case body and is efficiently exhausted from each exhaust port , thereby generating turbulent flow in the case body. it is possible to suppress, by providing the ribs over the entire circumference of the exhaust port, since the generation of wind noise at the edge of the exhaust port during the exhaust can be suppressed, thereby improving the quietness.

  Hereinafter, the configuration of an embodiment of the present invention will be described with reference to FIGS.

  In FIG. 4, reference numeral 1 denotes a vacuum cleaner main body. The vacuum cleaner main body 1 is a dust collector (not shown) that can attach and detach dust sucked together with intake air generated by driving an electric blower 2 that is a motor fan housed therein. Collect dust in the pack.

  The vacuum cleaner main body 1 has a main body suction port 3 for sucking air from the outside. An elongated substantially cylindrical hose body 4 that is flexible and can be bent is connected to the main body suction port 3. At the tip of the hose body 4, a hand operation unit 5 that can select an operation mode of the electric blower 2 is provided. The hand operating section 5 is provided with a gripping portion 6 that is gripped by an operator when cleaning, and projects a plurality of electric blowers 2 and the like in the cleaner body 1. A plurality of setting buttons 7 for setting the operation mode are provided.

  Further, an elongated and substantially cylindrical extension tube 8 that can be expanded and contracted is detachably connected to the distal end of the hand operation unit 5. Furthermore, a floor brush 9 serving as a suction port for sucking dust on the carpet is detachably connected to the distal end of the extension pipe 8, for example, placed on a carpet on the floor of the room. ing.

  As shown in FIGS. 1 and 2, the electric blower 2 includes a case body 11 formed of, for example, metal, and a motor 12 as an electric motor having a rotating shaft 12a is accommodated in the case body 11. ing. Further, a centrifugal fan 13 rotated by a motor 12 is located outside the case body 11, and a diffuser that is a rectifying plate is disposed between the centrifugal fan 13 and the motor 12 and outside the case body 11. 14 is attached, and the diffuser 14 and the centrifugal fan 13 are covered with a fan cover 15.

  In the following description, the motor 12 side is the rear side and the centrifugal fan 13 side is the front side.

  The case body 11 includes a case body main body 21 and a long plate-like bridge portion 22 attached to the front side of the case body main body 21.

  The case body 21 has a cylindrical body portion 24, a bottom portion 25 that closes the rear end portion of the body portion 24, and a flange portion 26 that extends in a radial direction from the front end portion of the body portion 24. It is formed in a bottomed cylindrical shape. Further, the rear end portion of the rotating shaft 12a of the motor 12 is pivotally supported at the center portion of the bottom portion 25 by a bearing or the like (not shown). In the bottom portion 25, a plurality of exhaust ports 27 are formed.

  Here, the exhaust port 27 exhausts the air sucked into the case body 11 by the centrifugal fan 13 rotated by the motor 12, and is formed in a square shape, for example, at a position near the outer periphery of the bottom portion 25. Further, they are arranged at substantially equal intervals in the circumferential direction. In addition, ribs 28 that are continuous over the entire circumference protrude from the periphery of each exhaust port 27 toward the rear, that is, outward of the case body 11.

  Each rib 28 is bent and raised from the bottom 25 to the outside by simultaneously burring when the exhaust port 27 of the bottom 25 of the case body 21 is press-molded. For this reason, as shown in FIG. 3, a curved surface portion 29 bent in a curved shape with respect to the inner surface side of the bottom portion 25, which is the bottom portion 25 in the case body 21, is formed at the base end portion of the rib 28. Yes. That is, the rib 28 is formed such that a corner portion or the like protruding toward the inner surface side of the bottom portion 25 is not formed at the base end portion, and is smoothly continuous with the bottom portion 25.

  1 and 2, the bridge portion 22 is attached to the flange portion 26 with a screw or the like so as to cross the front end portion of the body portion 24 in the radial direction.

  The motor 12 is rotated by receiving electric power from the outside, and is accommodated in the case body 11 so that the rotation shaft 12a is positioned on the central axis of the case body 11, and the rotor 12 is integrally formed with the rotation shaft 12a. A rotor (not shown) is provided, and this rotor is disposed in a stator (not shown) which is a substantially cylindrical stator. The rotation shaft 12a is inserted into the bridge portion 22 at the front end side and protrudes forward from the case body 11, and is rotatably supported on the rear side of the bridge portion 22 via a bearing (not shown).

  The centrifugal fan 13 has a plurality of spirally curved portions from the center side to the outer peripheral side between a back plate integrally fixed to the front end portion of the rotating shaft 12a and a front plate disposed opposite to the back plate. The fan blades are held, and the outside air is sucked into the air through an intake port 35 formed in the front end portion of the front plate, and is blown out in the outer peripheral direction by the fan blades.

  The diffuser 14 rectifies the air blown from the centrifugal fan 13 to the outer peripheral side and guides it into the case body 11 in a spiral shape in the central axis direction.

  The fan cover 15 is formed in a substantially covered cylindrical shape, and a round hole-like suction port 36 communicating with the suction port 35 of the centrifugal fan 13 is formed in the front end portion on the lid side.

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

  First, the worker sequentially connects the hose body 4, the extension pipe 8, and the floor brush 9 to the main body suction port 3 of the cleaner body 1.

  Further, when the operator pulls out the power cord from the cleaner body 1 and connects it to an outlet (not shown), and then operates the predetermined setting button 7 by holding the holding portion 6, the operation mode set by the setting button 7 is set. Accordingly, the electric blower 2 is driven.

  That is, in the electric blower 2, the motor 12 is rotated by supplying power to the motor 12, the centrifugal fan 13 is rotated together with the rotating shaft 12 a, and the outside air is sucked from the suction port 36 of the fan cover 15. The sucked air is sucked into the centrifugal fan 13 through the air inlet 35, and is blown out from the centrifugal fan 13 to the outer peripheral direction. The blown air is rectified by the diffuser 14 and the case body. The air is sucked into the main body 21 and goes straight along the axial direction in the case main body 21 while cooling the motor 12.

  Further, when the air is exhausted from the exhaust ports 27 to the outside of the case body 21, the air is rectified while flowing smoothly along the curved surface portion 29 at the base end portion of the rib 28.

  Then, the operation of the electric blower 2 causes negative pressure to act on the dust collection pack, the main body suction port 3, the hose body 4, the extension pipe 8, and the floor brush 9, so that the operator grasps the grip portion 6 to the floor. By moving the floor brush 9 back and forth on the surface, dust on the floor surface is sucked from the tip of the floor brush 9.

  The dust sucked together with the air is sucked into the dust collection pack through the extension pipe 8, the hose body 4 and the main body suction port 3 by the action of negative pressure, and this dust collection is performed when the air passes through the dust collection pack. Collected in a dust pack.

  As described above, according to the above-described embodiment, the exhaust port 27 is provided in the bottom portion 25 of the substantially bottomed cylindrical case body 11, so that the rotation shaft 12a of the motor 12 along the axial direction of the case body 11 is provided. The air sucked into the case body 11 by the provided centrifugal fan 13 can be efficiently exhausted by flowing linearly along the axial direction of the case body 11, and the occurrence of turbulence in the case body 11 can be suppressed. By providing the ribs 28 over the entire circumference of the exhaust port 27, it is possible to suppress the generation of wind noise at the edge of the exhaust port 27 during exhaust, so that the silence can be improved.

  Further, by forming a curved surface portion 29 that smoothly continues to the bottom 25 of the case body 21 at the base end of the rib 28, when air is exhausted from the inside of the case body 21 through the exhaust port 27, Since turbulent flow is less likely to occur in the air flow, it is possible to prevent the generation of noise associated with this turbulent flow, to further improve the quietness, and to improve the rectifying effect by the ribs 28.

  Further, since the rib 28 is formed by burring at the same time when the exhaust port 27 is press-molded, the rib 28 and the curved surface portion 29 can be easily formed, and a process for forming the rib 28 is separately performed. Therefore, a decrease in manufacturability can be prevented.

  By providing a plurality of exhaust ports 27 at positions near the periphery of the bottom portion 25 as relatively small openings, the rigidity and accuracy of the bottom portion 25 that supports the rotating shaft 12a of the motor 12 can be ensured.

  In the one embodiment, the details of the vacuum cleaner are not limited to the above configuration, and the vacuum cleaner is not limited to the canister type, for example, self-propelled (running assist type) or autonomous traveling A type (robot type) electric vacuum cleaner or the like may be used, and for example, an upright type in which the floor brush 9 is directly formed on the lower surface of the vacuum cleaner body 1 or a handy type may be used. .

  Moreover, the electric blower 2 can also be used for things other than a vacuum cleaner.

It is a center sectional view showing an electric blower of an embodiment of the present invention. It is a perspective view which shows an electric blower same as the above. It is a longitudinal cross-sectional view which expands and shows a part of case body of an electric blower same as the above. It is a perspective view which shows the electric vacuum cleaner provided with the electric blower same as the above.

Explanation of symbols

1 Vacuum cleaner body 2 Electric blower
11 Case body
12 Motor as an electric motor
12a Rotation axis
13 Centrifugal fan
27 Exhaust vent
28 Ribs

Claims (3)

And an electric motor to have a rotation axis,
A case body that is formed in a substantially bottomed cylindrical shape, and that supports the electric motor by pivotally supporting one end of the rotating shaft on the inner bottom;
A centrifugal fan that is provided on the other end side of the rotating shaft and is rotated by the electric motor to suck air into the case body;
A plurality of exhaust ports provided each located around the hand the rotary shaft at the bottom of the case body,
Electric blower which is characterized by comprising a rib provided along the entire circumference of these exhaust ports. The electric blower according to claim 1, wherein a proximal end side of the rib is continuous in a curved shape with respect to a bottom portion in the case body. The electric blower according to claim 1 or 2,
A vacuum cleaner comprising: a vacuum cleaner body that houses the electric blower.

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