JP2006299808A - Electric blower and vacuum cleaner using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric blower capable of improving air blowing efficiency, while restraining an increase in noise and a temperature rise in an electric motor. <P>SOLUTION: This electric blower has a fan case 6 for covering an air guide 5 for arranging an impeller 4 and a plurality of stationary blades 19, and an opening part 7 for exhausting a part of wind passing through the air guide 5. When the total area of this opening part 7 is set to S1 and the total cross-sectional area of a flow passage between the stationary blades 19 is set to S2, by setting so as to become S1 ≥ S2, the air blowing efficiency can be improved by increasing the air volume exhausted from the fan case 16 more than the air volume introduced into the electric motor 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric blower used for a vacuum cleaner or the like.

  This conventional electric blower will be described below with reference to FIG.

  As shown in FIG. 6, the electric blower 1 includes an impeller 4 attached and fixed to the shaft 3 of the electric motor 2, an air guide 5 disposed to face the outer periphery of the impeller 4, and the impeller 4 and the air guide 5. The fan case 6 is airtightly attached to the outer periphery of the electric motor 2. The fan case 6 has an air intake portion 6 a at the center and a plurality of openings 7 on the outer periphery. .

  The bracket 8 constituting the electric motor 2 is provided with an exhaust opening 9 for exhausting air sucked by the impeller 4, and an armature formed by laminating a commutator 10 and a thin silicon steel plate on the shaft 3. A rotor 13 in which the core 11 is press-fitted and fixed with a winding 12 and a stator 16 with a winding 15 in a field core 14 formed by laminating thin silicon steel plates are incorporated.

  Further, the bracket 8 is provided with a deformed tube 18 in which a carbon brush 17 that can slide with the commutator 10 is accommodated.

  The operation of the electric blower configured as described above will be described.

When the motor 2 is operated and the impeller 4 attached and fixed to the shaft 3 rotates at a high speed, air is sucked and an air flow is generated. This airflow is discharged from the outer periphery of the impeller 4, and a part of the airflow is discharged to the outside through the opening 7 provided on the outer periphery of the fan case 6 through the air guide 5, and the other airflow is the rotor in the bracket 8. 13, after cooling the windings 12 and 15 of the stator 16 and the carbon brush 17, the air was discharged from the exhaust opening 9.
Japanese Utility Model Publication No. 61-47964

  However, although it has been known for a long time that the air blowing efficiency of the electric blower 1 is improved by discharging a part of the sucked airflow from the outer periphery of the fan case 6 in the conventional configuration, The area and shape, the relative positional relationship with the air guide 5 and the like were not described in detail.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide an electric blower in which the blowing efficiency of the electric blower 1 is increased.

  In order to solve the conventional problem, the electric blower of the present invention includes an opening for discharging a part of the wind that has passed through the air guide in a fan case that covers the impeller and the air guide, and has a total area of the opening. Is set so that S1 ≧ S2, where S1 is the total cross-sectional area of the flow path between the stationary blades and S2.

  As a result, the amount of air discharged from the fan case can be made larger than the amount of air introduced into the electric motor, so that the pressure loss in the electric motor can be suppressed and the blowing efficiency can be improved.

  Moreover, the electric blower of the present invention is provided with an opening for discharging part of the wind that has passed through the air guide in a fan case that covers the impeller and the air guide, and the total area of the opening is S1. When the total cross-sectional area of the flow path between the bracket and the motor is S4, S1 ≧ S4 is set.

  Thereby, since the air quantity discharged | emitted from a fan case can be increased more reliably than the air quantity guide | induced in an electric motor, ventilation efficiency can be improved.

  The electric blower of this invention can improve ventilation efficiency, suppressing the increase in noise and the temperature rise of an electric motor.

  1st invention is provided in the outer periphery of the bracket with the electric blower, the electric motor provided in this bracket, the impeller rotated by the electric motor, and the impeller, and has a plurality of stationary blades on the surface. An air guide that forms a volute chamber between adjacent stationary blades, a fan case that covers the impeller and the air guide, and an opening that discharges part of the air that has passed through the air guide. By setting S1 ≧ S2 when the area is S1 and the total cross-sectional area of the flow path between the stationary blades is S2, the amount of air discharged from the opening on the outer periphery of the fan case is guided into the motor. Since it can be made larger than the amount of air, the air blowing efficiency can be improved.

  According to a second aspect of the present invention, there is provided a bracket, an electric motor provided in the bracket, an impeller rotated by the electric motor, an outer periphery of the impeller, and a plurality of stationary blades on the surface. An air guide having a volute chamber formed therein, a fan case covering the impeller and the air guide, and an opening for discharging a part of the air that has passed through the air guide. When the total cross-sectional area of the flow path between the motor and the motor is S4, by setting so that S1 ≧ S4, the amount of air that is discharged from the opening on the outer periphery of the fan case into the motor Since it can increase more reliably, ventilation efficiency can further be improved.

  The third invention is provided with an exhaust opening for exhausting the air supplied from the impeller to the outside, particularly on the side surface of the bracket in the first or second invention, and S1 is provided on the outer peripheral surface of the fan case. The sum of the total area of the openings and the total area of the exhaust openings.

  Thereby, after cooling the rotor and the stator in the electric motor, it becomes possible to smoothly exhaust to the outside of the electric motor, so that the temperature rise can be suppressed. Moreover, since the air quantity discharged | emitted from the opening part of a fan case outer periphery can be made further more than the air quantity guide | induced in an electric motor, ventilation efficiency can further be improved.

  In a fourth aspect of the invention, in particular, in any one of the first to third aspects, when the total cross-sectional area of the flow path between the stationary blade end and the fan case is S3, S1 ≦ S3. By setting, the cooling air can be reliably secured in the electric motor, so that the temperature rise of the electric motor can be suppressed.

  In the fifth aspect of the invention, in particular, when the total opening area of the exhaust opening provided on the side surface of the bracket of the fourth aspect of the invention is S5, the air discharged from the air guide is set to satisfy S3 ≦ S5. Since the number of lead to the motor is surely increased, the cooling effect of the motor can be improved and the temperature rise can be reliably suppressed.

  The sixth aspect of the invention can provide a vacuum cleaner with high suction performance while suppressing an increase in noise, particularly by providing the electric blower of any one of the first to fifth aspects of the invention in the vacuum cleaner.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a partial cross-sectional view of the electric blower according to the first embodiment of the present invention.

 The same components as those in the conventional example are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 1, an electric blower 1 includes an impeller 4 attached and fixed to a shaft 3 of an electric motor 2, an air guide 5 disposed to face the outer periphery of the impeller 4, and the impeller 4 and the air guide 5. The fan case 6 is airtightly attached to the outer periphery of the fan case 2. The fan case 6 has an air intake portion 6a at the center and a plurality of openings 7 on the outer periphery.

  In addition, the bracket 8 constituting the electric motor 2 is formed by press-fitting an armature core 11 formed by laminating a commutator 10 and a thin silicon steel plate on the shaft 3 and laminating a rotor 13 provided with a winding 12 and a thin silicon steel plate. A stator 16 having a winding 15 is built in the field core 14 formed as described above, and a deformed tube 18 containing a carbon brush 17 that can slide with the commutator 10 is provided in the bracket 8.

  The air guide 5 is provided with a plurality of stationary blades 19 and forms a volute chamber 20 for guiding the air discharged from the outer periphery of the impeller 4 between the adjacent stationary blades 19.

  Here, when the total area of the plurality of openings 7 provided in the fan case 6 is S1, and the total cross-sectional area of the flow path between the stationary blades 19 is S2, S1 ≧ S2. .

  About the electric blower 1 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the motor 2 is operated and the impeller 4 attached and fixed to the shaft 3 rotates at a high speed, air is sucked and an air flow is generated. This airflow is discharged from the outer periphery of the impeller 4, and a part of the airflow is provided on the outer periphery of the fan case 6 through the volute chamber 20 formed between the plurality of stationary blades 19 provided in the air guide 5. The remaining airflow was discharged from the opening 7 and cooled the rotor 13 in the bracket 8, the windings 12 and 15 of the stator 16, and the carbon brush 17. The arrows in the figure indicate the flow of air sucked from the intake portion 6a of the fan case 6.

  As described above, in the present embodiment, when the airflow discharged from the air guide 5 is changed in direction by 180 ° and guided into the electric motor 2, the aerodynamic “bending loss” increases. Although it was a cause of lowering the blowing efficiency, by discharging a part of the airflow from the opening 7 provided in the fan case 6, the “bending loss” is reduced and the pressure of the airflow guided into the electric motor 2 is reduced. Since the loss is also reduced, the air blowing efficiency is improved.

  Here, when the total area of the plurality of openings 7 provided in the fan case 6 is S1, and the total cross-sectional area of the flow path between the stationary blades 19 is S2, S1 ≧ S2 is set. Needless to say, since the airflow discharged from the opening 7 of the fan case 6 increases and the above “bending loss” can be further reduced, the air blowing efficiency is further improved.

  If the opening 7 is also provided on the side surface of the bracket 8, the pressure loss due to the air flow guided into the electric motor 2 is further reduced, and the blowing efficiency is further improved.

(Embodiment 2)
FIG. 2 is a plan sectional view of the air guide 5 and the fan case 6 in the second embodiment of the present invention. Note that the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  When the total area of the openings 7 provided in the fan case 6 is S1, and the total cross-sectional area of the flow path between the end of the stationary blade 19 and the fan case 6 is S3, S1 ≦ S3 is set. Yes.

  About the electric blower 1 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the motor 2 is operated and the impeller 4 attached and fixed to the shaft 3 rotates at a high speed, air is sucked and an air flow is generated. This airflow is discharged from the outer periphery of the impeller 4, and a part of the airflow is provided on the outer periphery of the fan case 6 through the volute chamber 20 formed between the plurality of stationary blades 19 provided in the air guide 5. The remaining airflow was discharged from the opening 7 and cooled the rotor 13 in the bracket 8, the windings 12 and 15 of the stator 16, and the carbon brush 17.

  As described above, in the present embodiment, when the airflow discharged from the air guide 5 is changed in direction by 180 ° and guided into the electric motor 2, the aerodynamic “bending loss” increases. Although it was a cause of lowering the blowing efficiency, by discharging a part of the airflow from the opening 7 provided in the fan case 6, the “bending loss” is reduced and the pressure of the airflow guided into the electric motor 2 is reduced. Since the loss is also reduced, the air blowing efficiency is improved.

  Here, when the total area of the plurality of openings 7 provided in the fan case 6 is S1, and the total cross-sectional area of the flow path between the end of the stationary blade 19 and the fan case 6 is S3, S1 ≦ S3 Therefore, only a part (50% or less) of the airflow that has passed through the air guide 5 is discharged from the opening 7 of the fan case 6, and the remaining 50% or more of the airflow is generated at the end of the stationary blade 19. Since the air is surely guided into the electric motor 2 via the flow path between the fan case 6 and the fan 13, the cooling effect of the rotor 13 and the stator 16 in the electric motor 2 is reliably maintained and the temperature rise is suppressed. Increase efficiency.

(Embodiment 3)
FIG. 3 is a plan sectional view of the air guide 5 and the fan case 6 in the third embodiment of the present invention. The same components as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted.

  When the total area of the openings 7 provided in the fan case 6 is S1, and the total cross-sectional area of the flow path between the bracket 8 and the electric motor 2 is S4, S1 ≧ S4 is set.

  About the electric blower 1 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the motor 2 is operated and the impeller 4 attached and fixed to the shaft 3 rotates at a high speed, air is sucked and an air flow is generated. This airflow is discharged from the outer periphery of the impeller 4, and a part of the airflow is provided on the outer periphery of the fan case 6 through the volute chamber 20 formed between the plurality of stationary blades 19 provided in the air guide 5. The remaining airflow is discharged from the opening 7 to the outside, and the remaining airflow is guided into the bracket 8 via the flow path between the bracket 8 and the electric motor 2, and the windings 12 and 15 of the stator 13 and the stator 16. The carbon brush 17 was cooled.

  As described above, in the present embodiment, when the airflow discharged from the air guide 5 is changed in direction by 180 ° and guided into the electric motor 2, the aerodynamic “bending loss” increases. Although it was a cause of lowering the blowing efficiency, by discharging a part of the airflow from the opening 7 provided in the fan case 6, the “bending loss” is reduced and the pressure of the airflow guided into the electric motor 2 is reduced. Since the loss is also reduced, the air blowing efficiency is improved.

  Here, when the total area of the plurality of openings 7 provided in the fan case 6 is S1, and the total cross-sectional area of the flow path between the bracket 8 and the electric motor 2 is S4, S1 ≧ S4 is set. Therefore, the airflow discharged from the opening 7 of the fan case 6 is increased and the “bending loss” can be further reduced, so that the blowing efficiency is improved.

(Embodiment 4)
FIG. 4 shows a partial cross-sectional view of the electric blower 1 according to the fourth embodiment of the present invention. In addition, about the same component as 1st-3rd embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  When the total area of the openings 7 provided in the fan case 6 is S1, and the total opening area S5 of the exhaust openings 9 provided in the bracket 8, S1 ≧ S5 is set.

  About the electric blower 1 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the motor 2 is operated and the impeller 4 attached and fixed to the shaft 3 rotates at a high speed, air is sucked and an air flow is generated. This airflow is discharged from the outer periphery of the impeller 4, and a part of the airflow is provided on the outer periphery of the fan case 6 through the volute chamber 20 formed between the plurality of stationary blades 19 provided in the air guide 5. Exhaust openings provided in the bracket 8 after the exhaust air is discharged from the opening 7 and the remaining airflow is guided into the bracket 8 to cool the rotors 13 and the windings 12 and 15 of the stator 16 and the carbon brush 17. Part 9 was discharged. The arrows in the figure indicate the flow of air sucked from the intake portion 6a of the fan case 6.

  As described above, in the present embodiment, when the airflow discharged from the air guide 5 is changed in direction by 180 ° and guided into the electric motor 2, the aerodynamic “bending loss” increases. Although it was a cause of lowering the blowing efficiency, by discharging a part of the airflow from the opening 7 provided in the fan case 6, the “bending loss” is reduced and the pressure of the airflow guided into the electric motor 2 is reduced. Since the loss is also reduced, the air blowing efficiency is improved.

  Here, when the total area of the plurality of openings 7 provided in the fan case 6 is S1, and the total opening area S5 of the exhaust opening 9 provided in the bracket 8, S1 ≧ S5 is set. Therefore, the airflow discharged from the opening 7 of the fan case 6 is increased, and the “bending loss” can be further reduced, so that it is needless to say that the blowing efficiency is improved.

  Further, by setting the relationship of the area of each part through which the airflow of air sucked from the air intake part 6a of the fan case 6 passes, S1 ≦ S3 ≦ S5, the amount of air guided into the electric motor 2 is surely increased, and the rotor 13. After the stator 16 is cooled, it is discharged more smoothly from the exhaust opening 9 provided in the bracket 8 to the outside of the electric blower 1, so that the cooling effect in the electric motor 2 is further ensured and the air blowing efficiency is improved while suppressing the temperature rise. can do.

  Further, by setting the relationship of the areas of the parts through which the airflow of air sucked from the air intake part 6a of the fan case 6 passes, S1 ≦ S3 ≦ S4 ≦ S5, the amount of air led into the electric motor 2 can be similarly ensured. After cooling the rotor 13 and the stator 16, the air is discharged more smoothly out of the electric blower 1 from the exhaust opening 9 provided in the bracket 8, so that the cooling effect in the electric motor 2 is further ensured and the temperature rise is suppressed. The air blowing efficiency can be improved.

(Embodiment 5)
FIG. 5 shows a longitudinal sectional view of the electric vacuum cleaner 21 in the fifth embodiment of the present invention. The same components as those in the first to fourth embodiments are denoted by the same reference numerals and description thereof is omitted.

  The vacuum cleaner main body 21 includes a dust collection chamber 22 in the front and a motor chamber 23 in the rear, and a dust collection paper bag 24 is mounted in the dust collection chamber 22. The electric blower 1 disposed in the motor chamber 23 is provided with an anti-vibration rubber front 25 on the outer periphery of the fan case 6 and an anti-vibration rubber rear 26 on the rear of the bracket 8, and in contact with the anti-vibration rubber front 25 around the periphery. A cylindrical soundproof cylinder 27 is provided. The soundproof cylinder 27 is provided with an exhaust part 27a.

  Further, a main body exhaust part 28 for discharging the sucked air is provided behind the cleaner body 21.

  About the electric blower 1 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the motor 2 is operated and the impeller 4 attached and fixed to the shaft 3 rotates at high speed, air is sucked together with dust from outside the cleaner body 21, and the dust is captured by the paper bag 24 in the dust collecting chamber 22. After that, only clean air is guided into the electric blower 1. This airflow is discharged from the outer periphery of the impeller 4, and a part of the airflow is provided on the outer periphery of the fan case 6 through the volute chamber 20 formed between the plurality of stationary blades 19 provided in the air guide 5. Exhaust openings provided in the bracket 8 after the exhaust air is discharged from the opening 7 and the remaining airflow is guided into the bracket 8 to cool the rotors 13 and the windings 12 and 15 of the stator 16 and the carbon brush 17. Each airflow is discharged from the main body exhaust portion 28 of the cleaner body 21 via the exhaust portion 27 a of the soundproof cylinder 27.

  As mentioned above, in this Embodiment, the electric blower 1 which improved the ventilation efficiency is integrated, and a vacuum cleaner with high suction performance can be provided.

  As described above, the electric blower according to the present invention and the electric vacuum cleaner using the electric blower can improve the efficiency of the electric blower, improve the suction work rate of the electric vacuum cleaner, and can suppress noise. It can be widely applied to household appliances using blowers and industrial equipment.

Partial sectional view of the electric blower according to Embodiment 1 of the present invention. Sectional drawing of the air guide of the electric blower in Embodiment 2 of this invention Sectional drawing of the electric motor of the electric blower in Embodiment 3 of this invention Partial sectional view of the electric blower in Embodiment 4 of the present invention The longitudinal cross-sectional view of the vacuum cleaner main body in Embodiment 5 of this invention Partial sectional view of a conventional electric blower

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric blower 2 Electric motor 4 Impeller 5 Air guide 6 Fan case 7 Opening 8 Bracket 9 Exhaust opening 13 Rotor 16 Stator 17 Carbon brush 19 Stator blade 20 Volute chamber 21 Vacuum cleaner main body 23 Motor chamber 25 Anti-vibration rubber front 26 Anti-vibration After rubber 27 Soundproof cylinder 28 Body exhaust part

Claims (6)

A bracket, an electric motor provided in the bracket, an impeller that is rotationally driven by the electric motor, and an outer periphery of the impeller. The volute chamber is formed between adjacent stationary blades having a plurality of stationary blades on the surface. An air guide, a fan case that covers the impeller and the air guide, and an opening that discharges a part of the air that has passed through the air guide, the total area of the opening being S1, and the flow path between the stationary blades An electric blower set so that S1 ≧ S2 when the total cross-sectional area is S2. A bracket, an electric motor provided in the bracket, an impeller that is rotationally driven by the electric motor, and an outer periphery of the impeller. The volute chamber is formed between adjacent stationary blades having a plurality of stationary blades on the surface. An air guide, a fan case that covers the impeller and the air guide, and an opening that discharges a part of the wind that has passed through the air guide. The total area of the opening is between S1 and the bracket and the motor. An electric blower set so that S1 ≧ S4 when the total cross-sectional area of the flow path is S4. An exhaust opening for exhausting the wind supplied from the impeller into the bracket to the outside is provided on the side of the bracket, and S1 is defined as a total area of the opening provided on the outer peripheral surface of the fan case and a total area of the exhaust opening. The electric blower according to claim 1 or 2, which is the sum of The electric blower according to any one of claims 1 to 3, which is set to satisfy S1 ≤ S3, where S3 is a total cross-sectional area of the flow path between the stationary blade end and the fan case. The electric blower according to claim 4, wherein S3 ≦ S5 is set, where S5 is a total opening area of the exhaust opening provided on the side surface of the bracket. The vacuum cleaner provided with the electric blower of any one of Claims 1-5.

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