JP2006177284A - Electric blower and vacuum cleaner using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve air blowing performance by improving flow of air in an electric blower. <P>SOLUTION: This vacuum cleaner is constituted by forming a recessed part 13 in the direction for enlarging passage area of air flow over the whole periphery of a crossing part of a flange part 11 of a bracket 9 and a cylindrical part 10 and extending a return passage blade 6 of an air guide 5 in the direction of downstream side of air flow in a space in the recessed part 13. Consequently, the width between the bracket 9 and a stator 1 is increased, quantity of air when the air exhausted from a rotary fan 4 passes through the inside of the air guide 5 and flows into the bracket 9 is increased, and abrupt change of air flow is prevented. Air flow is streamlined without diffusing by extending the return passage blade 6 of the air guide 5 to feed air into the bracket 9 efficiently, which realizes the electric blower having high efficiency and capable of improving air blowing performance. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electric blower mainly used for a vacuum cleaner, and more particularly to an electric blower that improves the blowing performance by improving the flow of wind.

  In recent years, competition for higher output in vacuum cleaners and the like has intensified, and there is a demand for higher output and higher efficiency for electric blowers that are key components.

  Hereinafter, a conventional electric blower will be described with reference to the drawings. FIG. 12 is a partial cross-sectional view showing a configuration of a conventional electric blower. In FIG. 12, reference numeral 1 denotes a stator, 2 denotes a rotor, 9 denotes a flange portion projecting outside the cylindrical portion 10 at one end opening edge of the cylindrical portion 10 that houses the rotor 2 disposed inside the stator 1. 11 is a bracket formed by providing 11. The bracket 9 is provided with a deformed tube 16 that houses a carbon brush that transmits current to the rotor 2.

  In addition, 4 is a rotary fan fixed to the rotating shaft 3 of the rotor 2, 5 has a plurality of wind inlets in the periphery, and is provided with a plurality of return passage blades 6 connected to these wind inlets on the inner surface, An air guide is provided so as to cover one end openings of the rotating fan 4 and the bracket 9 and guides the air discharged from the rotating fan 4 into the bracket 9. A fan case 7 covers the air guide 5 and the rotating fan 4. 9 is press-fitted and fixed.

  About the electric blower comprised as mentioned above, the operation | movement is demonstrated below. When power is applied to the electric blower, the rotor 2 rotates at a high speed. Next, the rotating fan 4 fixed to the rotating shaft 3 rotates as the rotor 2 rotates. Therefore, when the rotating fan 4 rotates at high speed, air is sucked from the air inlet 8 of the fan case 7 and is guided to the inside of the bracket 9 by the air guide 5 through the inside of the rotating fan 4. Thereafter, the air guided into the bracket 9 is discharged to the outside while cooling the stator 1 and the rotor 2.

  A plurality of concave air passages 12 are provided radially at the intersection between the cylindrical portion 10 and the flange portion 11 of the bracket 9.

With this configuration, it is possible to prevent a sudden change in the air flow when the air discharged from the rotary fan 4 flows into the bracket 9 through the air guide 5 and the air blowing performance can be improved ( For example, see Patent Document 1).
JP-A-6-257598

  However, in the conventional configuration, when the air sucked from the rotary fan 4 passes through the air guide 5 and flows into the bracket 9, a plurality of recessed air passages 12 are formed at the intersection of the bracket cylindrical portion 10 and the flange portion 11. Since only one piece is provided, the air flow is abruptly changed in a place where a part of the ventilation path is not provided, and the turbulence of the air flow occurs, and the air flow rate is reduced to reduce the blowing performance. .

  In addition, the air blowing performance is reduced due to the large area of the planar portion that collides with the air that flows into the bracket 9 from the air guide 5 in the stator 1, the deformed pipe 16, and the like.

  The air flowing from the air guide 5 into the bracket cylindrical portion 10 does not flow straight from the rotary fan 4 side toward the bracket 9 but flows while rotating inside the bracket 9 due to the shape of the air guide return passage blade 6. .

  However, since the stator 1 and the bracket 9 are press-fitted and fixed to the bracket 9 at the four corners of the stator 1 without gaps, the air flowing while rotating inside the bracket cylindrical portion 10 is blocked, and the air blowing performance is improved. It was decreasing.

  In order to solve the above-described conventional problems, the electric blower of the present invention forms a recess in the direction of enlarging the passage area of the airflow around the entire intersection of the flange portion and the cylindrical portion of the bracket, The return guide blades of the air guide are extended in the downstream direction of the wind flow.

  This increases the width between the bracket and the stator, increases the air volume when the air discharged from the rotary fan flows into the bracket through the air guide, and changes the air flow abruptly. It is possible to prevent this, and by extending the return guide blades of the air guide, the airflow is rectified without diffusing, so that the air can be efficiently sent into the bracket and the air blowing performance can be improved.

  The electric blower of this invention can improve ventilation performance by improving the flow of the wind in an electric blower.

  A first invention includes a stator having a stator core, a rotor disposed inside the stator, a cylindrical portion and a flange portion which house the stator and rotatably hold the rotor A rotary fan fixed to one end of a rotary shaft, an air guide for guiding an air flow generated by the rotary fan, and a fan case covering the rotary fan and the air guide, the flange portion and the cylindrical portion A recess in the direction of enlarging the passage area of the airflow is formed at the intersection of the air guide, and the return passage blade of the air guide is extended in the downstream direction of the wind flow in the space of the recess, thereby The width becomes wider, and the air volume when the air discharged from the rotary fan flows into the bracket through the inside of the air guide increases, and it is possible to prevent the air flow from changing suddenly. Further, by extending the return passage blades of the air guide, the air flow is rectified without diffusing, and air can be efficiently sent to the inside of the bracket, thereby providing a highly efficient electric blower with improved air blowing performance. it can.

  A second invention includes a stator having a stator core, a rotor disposed inside the stator, and a cylindrical portion and a flange portion which house the stator and rotatably hold the rotor A rotating fan fixed to one end of a rotating shaft, an air guide for guiding an air flow generated by the rotating fan, and a fan case covering the rotating fan and the air guide, By providing a flange recess between the return passage blades of the air guide and the blades, the passage area becomes deeper in the downstream direction of the wind flow along the direction of the air flow from the air guide, whereby the rotary fan rotates. When the airflow generated by the air is guided by the air guide and passes through the bracket flange, the flange recess reduces the load when the airflow collides with the flange, and the wind is adjusted. Is, and the air volume also can send air flowing out of the air guide efficiently inside bracket increased, it is possible to provide an electric blower of high efficiency with improved blowing performance.

  According to a third aspect of the present invention, the concave portion or the flange concave portion of the first or second aspect of the invention is subjected to a concave and convex process so that the air flow generated by the rotation of the rotating fan is guided by the air guide, and the flange portion has the fastest flow rate. A high-efficiency electric blower that prevents the flow rate from decelerating and efficiently sends the air flow into the bracket and improves the air blowing performance by providing concave and convex portions in the concave portion or flange concave portion. Can be provided.

  In the fourth aspect of the invention, in particular, by using the electric blower according to any one of the first to third aspects of the invention for a vacuum cleaner, the air blowing performance can be improved, and a highly efficient vacuum cleaner can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a partial cross-sectional view showing a configuration of an electric blower according to a first embodiment of the present invention. 1 is a stator, 2 is a rotor, 3 is a rotating shaft, 4 is a rotating fan, 5 is an air guide, 6 is an air guide return passage blade, 7 is a fan case, 8 is an air inlet, 9 is a bracket, 10 is a bracket cylindrical portion, and 11 is a bracket flange portion, which is the same as the conventional example.

  The operation of the above configuration will be described below. When power is applied to the electric blower, the rotor 2 rotates at a high speed. Next, the rotating fan 4 fixed to the rotating shaft 3 rotates as the rotor 2 rotates. When the rotating fan 4 rotates, air is sucked from the suction port 8 of the fan case 7 and is guided into the bracket 9 by the air guide 5 through the rotating fan 4.

  As shown in FIG. 1, the bracket 9 has a flange portion 11 that projects outward from a cylindrical portion 10 that houses the rotor 2 disposed inside the stator 1, and includes a bracket flange portion 11 and a cylindrical portion 10. A recess 13 is formed in the entire circumference of the intersection so as to increase the passage area of the airflow, and the air guide return passage vane 6 is extended in the downstream direction of the wind flow in the space of the recess 13.

  The operation of the above configuration is as follows.

  When power is applied to the electric blower and the airflow generated by the rotary fan 4 is guided from the flange portion 11 to the cylindrical portion 10 by the air guide 5, the airflow between the stator 1 and the bracket 9 is passed through the recess 13. Since the passage area is large, it is rectified by preventing abrupt changes in the air flow, a smooth air flow can be obtained, and the amount of air flowing into the bracket 9 can be increased. Further, the air guide return passage blade 6 is extended in the downstream direction of the wind flow to prevent the air flow from diffusing, and the air flow is efficiently guided to the inside of the bracket cylindrical portion 10 by reducing the turbulence of the air flow. it can. As a result, it is possible to improve the blowing performance and realize a highly efficient electric blower.

(Embodiment 2)
A second embodiment of the present invention will be described below with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same component as the said 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIGS. 2 and 3, the bracket flange portion 11 has a passage area downstream of the wind flow between the air guide return passage blade 6 and the blade along the direction of the air flow guided from the air guide 5. A flange recess 14 is provided so as to become deeper in the direction.

  The operation of the above configuration is as follows.

  When power is applied to the electric blower and the air flow generated by the rotary fan 4 is guided from the flange portion 11 to the cylindrical portion 10 by the air guide 5, the air guide return path blades 6 of the bracket flange portion 11 are blown between the blades. By providing the concave portion 14 which becomes deep along the flow of the air flow, the load when the air current collides with the flange portion 11 can be reduced, the air is rectified, and the air flow guided by the air guide 5 by increasing the air volume. Can be efficiently sent into the bracket cylindrical portion 10. Thereby, air blowing performance can be improved and a highly efficient electric blower can be realized.

(Embodiment 3)
Hereinafter, a third embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 4 and FIG. 5, the concave / convex machining 15 is provided on the concave portion 13 or the flange concave portion 14 provided so that the passage area of the air flow generated by the rotary fan 4 described in the first or second embodiment is enlarged. Has been given.

  The above operation is as follows.

  When the air flow generated by the rotation of the rotary fan 4 is guided by the air guide 5 and reaches the flange portion 11 as the fastest flow velocity, the concave portion 13 or the flange concave portion 14 is provided with the concave and convex portions 15, so that the flow velocity is increased. Deceleration is prevented and airflow can be efficiently sent into the bracket cylindrical portion 10. Thereby, air blowing performance can be improved and a highly efficient electric blower can be realized.

(Embodiment 4)
Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 6, the deformed tube 16 that houses the carbon brush 23 has a semicircular shape that swells in the upstream direction of the airflow on the top surface plane that collides with the airflow guided from the air guide to the inside of the bracket cylindrical portion. A convex portion 17 is provided.

  The above operation is as follows.

  When the air flow generated by the rotation of the rotating fan is guided into the bracket cylindrical portion by the air guide and collides with the top surface flat portion of the deformed tube 16, the air flow is directed to the top surface flat portion of the deformed tube 16 in the upstream direction of the air flow. By providing the semicircular convex portion 17 that swells, the load when the air current collides with the deformed pipe 16 can be reduced, and the turbulence of the air current can be prevented. Thereby, air blowing performance can be improved and a highly efficient electric blower can be realized.

(Embodiment 5)
Hereinafter, a fifth embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 7, the stator 1 is chamfered at a corner formed by the top surface and the side surface of the stator 1 that collides with the wind flowing out from the air guide 5.

  The above operation is as follows.

  The airflow generated by the rotation of the rotary fan 4 is guided into the bracket cylindrical portion 10 by the air guide 5 and collides with the stator 1, so that the air is guided to the stator 1 from the air guide 5 into the bracket 9. By chamfering 18 at the corner formed by the top and side surfaces of the stator 1 that collides with the stator 1, the load when the air current collides with the stator 1 is reduced, and the air current flows to the bracket cylindrical portion 10. When entering, the area between the stator 1 and the wall surface of the bracket cylindrical portion 10 is increased, so that the area of the airflow passage is enlarged and the turbulence of the airflow can be prevented. Thereby, ventilation performance can be improved and a highly efficient electric blower can be realized.

(Embodiment 6)
A sixth embodiment of the present invention will be described below with reference to FIG.

  The bracket 9 has an inner wall of the cylindrical portion 10 in which the rotor 2 is accommodated. The rotating fan 4 rotates on the inner wall of the cylindrical portion 10. The air guide 5 introduces the air into the bracket 9. A recess 19 is provided so that the passage area of the airflow becomes wider and deeper from upstream to downstream.

  The above operation is as follows.

  The airflow flowing while rotating inside the bracket cylindrical portion 10 due to the shape of the return passage blade 6 of the air guide has a large and deep airflow passage area in substantially the same direction as the wind flow and from upstream to downstream of the wind. By guiding out to the outside of the motor so as to follow along the concave portion 19 as described above, it is possible to prevent turbulence of the air current and improve the blowing performance by applying centrifugal force. Thereby, ventilation performance can be improved and a highly efficient electric blower can be realized.

(Embodiment 7)
The seventh embodiment of the present invention will be described below with reference to FIG.

  As shown in FIG. 9, the stator 1 is formed with an air flow path portion 20 in a corner portion that is press-fitted and fixed to the bracket.

  The above operation is as follows.

  When the airflow flowing while rotating inside the bracket cylindrical part due to the shape of the air guide return passage blades collides with the corner part where the stator 1 and the bracket are press-fitted and fixed, the bracket and the press-fit are fixed to the stator 1 By forming the air flow path portion 20 at the corner portion, the load when colliding with the air current can be reduced, and the air blowing performance can be improved by preventing the air current from being disturbed. Thereby, air blowing performance can be improved and a highly efficient electric blower can be realized.

(Embodiment 8)
The eighth embodiment of the present invention will be described below with reference to FIG.

  As shown in FIG. 10, the stator 1 generates airflow from the upstream side of the wind toward the downstream side in substantially the same direction as the wind flow that is generated by the rotation of the rotating fan and is guided into the bracket by the air guide. Grooves 21 are formed so that the passage area is wide and deep.

  The above operation is as follows.

  The airflow that flows while rotating inside the bracket cylindrical part due to the shape of the return passage blades of the air guide is almost the same direction as the wind flow, and the airflow passage area becomes wider and deeper from upstream to downstream of the wind. By guiding it to the outside of the motor along the groove 21, it is possible to prevent turbulence of the air current and improve the blowing performance. Thereby, air blowing performance can be improved and a highly efficient electric blower can be realized.

(Embodiment 9)
The ninth embodiment of the present invention will be described below with reference to FIG.

  As shown in FIG. 11, an opening 22 is provided on the wall surface of the bracket cylindrical portion 10 in the vicinity of the corner portion that is press-fitted and fixed to the stator 1. ing.

  The above operation is as follows.

  The airflow flowing while rotating inside the bracket cylindrical portion 10 due to the shape of the return passage blade 6 of the air guide 5 passes through the opening 22 provided in the bracket cylindrical portion 10, so that the bracket 9 and the stator 1 are connected. By reducing the load when colliding with the corners that are press-fitted and fixed, it is possible to prevent turbulence of the airflow, and by letting the wind to the outside of the motor, the circulation efficiency of the airflow inside the motor is improved. The air blowing performance can be improved. Thereby, air blowing performance can be improved and a highly efficient electric blower can be realized.

  As described above, the electric blower according to the present invention can improve the blowing performance, and can be applied to uses such as a highly efficient electric vacuum cleaner.

The fragmentary sectional view which shows the structure of the electric blower in Embodiment 1 of this invention Partially omitted plan view showing the configuration of the electric blower in Embodiment 2 of the present invention The bottom view of the air guide of the electric blower The partial cross section side view which shows the structure of the electric blower in Embodiment 3 of this invention Same as above, enlarged cross-sectional view of the electric blower Sectional drawing which shows the structure of the electric blower in Embodiment 4 of this invention. The fragmentary sectional view which shows the structure of the electric blower in Embodiment 5 of this invention The fragmentary sectional view which shows the structure of the electric blower in Embodiment 6 of this invention Overall view showing the configuration of the electric blower in Embodiment 7 of the present invention Overall view showing the configuration of an electric blower in Embodiment 8 of the present invention The fragmentary sectional view which shows the structure of the electric blower in Embodiment 9 of this invention Partial sectional view showing the configuration of a conventional electric blower

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator 2 Rotor 3 Rotating shaft 4 Rotating fan 5 Air guide 6 Air guide return passage blade 7 Fan case 8 Air inlet 9 Bracket 10 Cylindrical portion 11 Flange portion 12 Bracket air passage 13 Recessed portion 14 Flange recessed portion 15 Unevenness processing 16 Deformed pipe 17 Profile tube top surface convex part 18 Stator chamfering part 19 Bracket cylindrical part inner wall concave part 20 Stator corner part air flow path part 21 Stator groove 22 Bracket opening 23 Carbon brush

Claims (4)

A stator having a stator iron core, a rotor disposed inside the stator, a bracket having a cylindrical portion and a flange portion that accommodates the stator and rotatably holds the rotor; A rotating fan fixed to one end of a rotating shaft of the rotor, an air guide for guiding an air flow generated by the rotating fan, and a fan case covering the rotating fan and the air guide, and the flange portion and the cylindrical portion An electric blower in which a substantially cylindrical recess for enlarging an airflow passage area is formed in the downstream direction at the intersection, and a return passage blade of an air guide is extended in the space of the recess. A stator having a stator iron core, a rotor disposed inside the stator, a bracket having a cylindrical portion and a flange portion that accommodates the stator and rotatably holds the rotor; A rotary fan fixed to one end of a rotary shaft of the rotor, an air guide for guiding an air flow generated by the rotary fan, and a fan case covering the rotary fan and the air guide, and the air guide of the flange portion An electric blower provided with substantially radial flange recesses between the return passage blades, the passage area expanding along the direction of the air flow from the air guide. The electric blower according to claim 1 or 2, wherein the concave portion or the concave portion of the flange is subjected to uneven processing. The vacuum cleaner provided with the electric blower of any one of Claims 1-3.

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