JP2005226608A - Motor-driven blower and vacuum cleaner using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor-driven blower having high efficiency and reducing noise, and a vacuum cleaner loaded with it. <P>SOLUTION: This motor-driven blower 1 includes: a motor 15 having a rotatably held rotor 5; a shaft 6 as an output shaft of the rotor 5; an impeller 16 mounted on the shaft 6; an air guide 17 forming a ventilation passage in the outer peripheral part of the impeller 16; and a fan case 18 covering the air guide 17 and the impeller 16, wherein the inner surface of the fan case 18 is provided with a straightening part 61 for turing the air passed through the ventilation passage. The air current discharged from the impeller 16 is smoothly turned in a substantially 180° arc along the straightening part 61, whereby loss in turning can be reduced to improve the efficiency of the motor-driven blower 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

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

  First, the structure of the conventional general vacuum cleaner and the electric blower for vacuum cleaners is demonstrated using FIGS.

  As shown in FIG. 7, the vacuum cleaner body 101 of the electric vacuum cleaner includes a dust collection chamber 102 in the front and a motor chamber 103 in the rear, and a dust collection paper bag 104 is mounted in the dust collection chamber 102. In the electric blower 1, the outer peripheral side surface of the fan case 18 is held by a holding member A105 formed of a resilient material such as rubber having high vibration isolation, and the rear side of the anti-load side bracket 12 is fixed by a similar holding member B106. It is held and incorporated in the motor chamber 103 of the cleaner body 101.

  As shown in FIG. 8, the electric blower 1 includes a stator 2 in which a field winding (omitted) is applied to a field core 3, and an armature winding (5) in an armature core 7 that is passed through a shaft 6. (Schematic) 8 is a rotor that is fixed rotatably by bearings 10 provided at both ends of a shaft 6 with a commutator 9 arranged coaxially. The stator 2 and the rotor 5 are fixed to the load side bracket 11 and the anti-load side bracket 12, and a motor 15 is formed by inserting a pair of carbon brushes (omitted) into the anti-load side bracket 12 through the deformed pipe 14. ing. Reference numeral 19 denotes an exhaust port. Further, the shaft 6 of the output shaft is provided with an impeller 16, and an air guide 17 that forms a ventilation path is disposed on the outer peripheral portion of the impeller 16, and the air guide 17 is constituted by the adjacent stationary blades 26 on the upper surface. The diffuser portion 20 having a plurality of passages, the flow changing portion 21 for guiding the flow to the lower surface of the air guide 17, and the return passage 22. And the fan case 18 is attached so that these may be covered, and it becomes the electric blower 1. FIG. Reference numeral 24 denotes an intake port.

  In the above configuration, when electric power is supplied, the current conducted through the field winding is transmitted to the commutator 9 through the carbon brush (omitted), and the magnetic flux generated in the field core 3 and the current through the armature winding 8. A force is generated between the rotor 5 and the rotor 5. Next, when the rotor 5 rotates, the impeller 16 fixed to the shaft 6 of the rotor 5 rotates, and the air in the impeller 16 is accelerated. The increased air passes through the diffuser portion 20 of the air guide 17. Then, the vehicle is decelerated and enters the flow changing unit 21, the direction is changed by approximately 180 degrees, and is guided to the motor 15 through the return path 22. Thereafter, the rotor 5, the stator 2, and the carbon brush are cooled and discharged from the exhaust port 19 of the non-load side bracket 12.

In the configuration of the general electric blower 1 as described above, there is a limit to the increase in efficiency of the electric blower 1 in accordance with the recent increase in the suction work rate. As an example devised to compensate for this, the following configuration is provided. Are known. According to this, as shown in FIG. 9, a plurality of slits 25 are provided on the outer periphery of the fan case 18, and a part of the air accelerated by the impeller 16 is linearly discharged therefrom, thereby improving the efficiency of the electric blower 1. (For example, refer to Patent Document 1).
Japanese Utility Model Publication No. 61-47964

  However, in the above-described conventional configuration, the accelerated air discharged from the impeller 16 passes through the diffuser portion 20 of the air guide 17 and loses a loss when the direction is changed by approximately 180 degrees when going to the return passage 22. Occurred and hindered efficiency improvement.

  In order to reduce the loss when the direction is changed as much as possible, if the corner R on the inner surface of the fan case 18 is set large, the accelerated air discharged from the impeller 16 is smoothly changed direction and the loss is reduced. However, if the corner R of the fan case 18 is increased, the dimension of the straight portion on the outer periphery of the fan case 18 is reduced, and the effective contact surface for holding with the holding member A105 holding the electric blower 1 is reduced. Therefore, the holding force of the holding member A105 and the electric blower 1 is reduced, and it becomes difficult to hold the electric blower 1 in the motor chamber 103 of the cleaner body 101, which is difficult to realize.

  Further, in the configuration described in Patent Document 1 aiming at high efficiency, the slit 25 is provided on the outer periphery of the fan case 18, and the air flow guided to the slit 25 is also emitted when air accelerated by the impeller 16 is discharged. Collided with the inner surface of the outer periphery of the fan case 18, causing loss and hindering efficiency improvement.

  In addition, since the slit 25 is provided on the outer periphery of the fan case 18, the contact surface effective for holding the holding member A and the electric blower 1 is less than the conventional general configuration, and the holding member A 105 and the fan are further provided. The contact allowance on the outer peripheral surface of the case 18 is reduced, the holding force is lacking, and it becomes very difficult to hold the electric blower 1 in the motor chamber 103 of the cleaner body 101, which is difficult to realize.

  An object of the present invention is to solve the above-mentioned problems, and to provide an electric blower that is high in efficiency and can reduce noise, and a vacuum cleaner equipped with the electric blower.

  In order to solve the conventional problems, an electric blower of the present invention includes a motor having a rotor held rotatably, a shaft that is an output shaft of the rotor, an impeller provided on the shaft, and the impeller An air guide that forms a ventilation path on the outer periphery of the air guide, and a fan case that covers the air guide and the impeller, and a rectifying unit that changes the direction of the air that has passed through the ventilation path on the inner surface of the fan case. Since the air flow discharged by the impeller is smoothly changed in direction by approximately 180 degrees along the rectifying unit, the loss at the time of changing direction is reduced, and the efficiency of the electric blower is improved. To do.

  The electric blower of the present invention can provide an electric blower that is highly efficient and can reduce noise, and a vacuum cleaner equipped with the electric blower.

  A first invention includes a motor having a rotor held rotatably, a shaft that is an output shaft of the rotor, an impeller provided on the shaft, and an air guide that forms a ventilation path in an outer peripheral portion of the impeller. And a fan case that covers the air guide and the impeller, and a rectifying portion for changing the direction of the air that has passed through the ventilation path is provided on the inner surface of the fan case, and is discharged by the impeller. Since the air flow is smoothly changed in direction by about 180 degrees along the rectifying unit, the loss at the time of changing the direction is reduced, so that the efficiency of the electric blower is improved.

  In the second invention, an opening for discharging the exhaust air from the impeller is provided on the outer periphery of the fan case, and a part of the airflow sucked by the impeller is discharged linearly from the opening. Efficiency is good, and other airflows are smoothly turned approximately 180 degrees along the R shape of the rectifying unit, so the loss at the time of turning is reduced and efficiency is improved, and the suction performance is further improved. it can.

  The third invention is configured to press-fit and fix the rectifying unit on the inner surface of the fan case, and is excellent in assembling and can prevent displacement of the rectifying unit and the fan case, thereby improving the suction performance. .

  According to a fourth aspect of the present invention, the rectifying unit is configured to be bonded and fixed to the inner surface of the fan case. The rectifying unit and the fan case are excellent in assembling property and can prevent displacement of the rectifying unit and the fan case. Since a minute gap is not generated between them, the suction performance can be further improved.

  According to a fifth aspect of the present invention, the rectifying unit is configured to be welded and fixed to the inner surface of the fan case. The rectifying unit and the fan case are excellent in assembling property and can prevent displacement of the rectifying unit and the fan case. Since a minute gap is not generated between them, the suction performance can be further improved.

  In the sixth aspect of the invention, the rectifying unit is configured to be bonded and fixed to the air guide, and the ventilation path of the diffuser unit can be formed without gaps, so that leakage to other adjacent diffuser units can be prevented, and further suction performance Can be improved.

  In the seventh aspect of the invention, the rectifying unit is configured to be welded and fixed to the air guide, and the ventilation path of the diffuser unit can be formed without a gap, so that the assembly is good and leakage to other adjacent diffuser units is prevented. This can be prevented and the suction performance can be improved.

  In the eighth aspect of the invention, the rectifying unit is made of a material having sound absorbing performance and absorbs the generated noise. Therefore, the noise emitted from the electric blower can be reduced and the noise can be reduced.

  In the ninth aspect, the electric blower according to any one of the first to eighth aspects is mounted on a vacuum cleaner, and the suction performance of the vacuum cleaner can be improved and noise can be reduced. High vacuum cleaner can be provided.

  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)
A first embodiment of the present invention will be described with reference to FIGS. The same components as those in the conventional example are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 1 is a partial cross-sectional view of the electric blower of the present embodiment, and FIG. 2 is an enlarged cross-sectional view of a main part of the electric blower.

  As shown in FIG. 1, the shaft 6 of the output shaft is provided with an impeller 16, and an air guide 17 that forms a ventilation path is disposed on the outer periphery of the impeller 16, and the air guide 17 has a static surface adjacent to the surface. A diffuser portion 20 having a plurality of ventilation paths constituted by the blades 26, a flow changing portion 21 that guides the flow to the back surface of the air guide 17, and a return passage 22. And the fan case 18 is attached so that these may be covered, and it becomes the electric blower 1. FIG. Reference numeral 24 denotes an intake port.

  In addition, as shown in FIG. 2, the corner portion formed by the top surface and the outer periphery of the fan case 18 is provided with a rectifying portion 61 that is annular and has a substantially R-shaped portion on the inside. It is provided with parts. The outer diameter of the rectifying unit 61 and the inner diameter of the fan case 18 are set as press-fit dimensions. The rectifying unit 61 is fixed to the fan case 18 and the fan case 18 is press-fitted into the load side bracket 11 or the anti-load side bracket 12. When being fixed, it is held between the air guide 17 and the fan case 18.

  The operation in the above configuration will be described. When electric power is supplied, the current conducted through the field winding is transmitted to the commutator 9 through the carbon brush (omitted), and the magnetic flux generated in the field core 3 and the armature winding. A force is generated between the current passing through 8 and the rotor 5 rotates. Next, when the rotor 5 rotates, the impeller 16 fixed to the shaft 6 of the rotor 5 rotates, and the air in the impeller 16 is accelerated. The increased air passes through the diffuser portion 20 of the air guide 17. Then, the vehicle is decelerated and enters the flow changing unit 21, the direction is changed by approximately 180 degrees, and is guided to the motor 15 through the return path 22. Thereafter, the rotor 5, the stator 2 and the carbon brush (omitted) are cooled and discharged from the exhaust port 19 of the non-load side bracket 12.

  At this time, the air that has passed through the diffuser part 20 has some dynamic pressure energy, and if the flow is changed by the flow changing part 21 by approximately 180 degrees, the bending loss in the same part increases. In the embodiment, the air that has passed through the diffuser unit 20 collides with the rectifying unit 61 provided on the inner surface of the fan case 18, and the direction of the air flow is changed along the substantially R-shaped part of the rectifying unit 61 to bend. Since it is guided to the return path 22 while suppressing the loss, the loss is reduced.

  Thus, according to this Embodiment, since the bending loss in the air guide 17 can be reduced, the efficient electric blower 1 is realizable.

  If the rectifying unit 61 is fixed to the inner surface of the fan case 18 by means such as ultrasonic welding or vibration welding, positional deviation of the rectifying unit 61 can be suppressed, and the fan case 18 and the rectifying unit 61 are integrated. Therefore, the strength of the fan case 18 is increased, the vibration value of the fan case 18 due to the vibration generated by the electric blower 1 is reduced, and the noise of the cleaner body 1 to be mounted is reduced.

  Further, when the rectifying unit 61 is fixed to the inner surface of the fan case 18 with an adhesive, a minute gap between the rectifying unit 61 and the fan case 18 is filled with the adhesive, so that the air flow discharged from the impeller 16 However, since it is efficiently guided to the lower part of the air guide 17 without entering the minute gap, the loss can be further reduced and the electric blower 1 with high efficiency can be realized.

  In addition, in the structure of the general electric blower 1 as described above, the above-described effects can be obtained. However, as illustrated in FIG. 3, on the outer periphery of the fan case 18 as disclosed in Patent Document 1 The same effect can be obtained also in the case where slits 25 which are a plurality of openings are provided and a part of the air accelerated by the impeller 16 is linearly discharged therefrom to increase the efficiency of the electric blower 1. Needless to say, this can be realized without reducing the holding force between the fan case 18 provided with the slit 25 and the holding member A105.

  Moreover, in this Embodiment, although the part of the rectification | straightening part 61 with which the air which passed the diffuser part 20 collides becomes a substantially R shape part, even if it is not a substantially R shape, what is necessary is just a smooth curve shape. .

(Embodiment 2)
Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 4, the rectifying unit 61 is fixed to the top surface of the stationary blade 26 forming the diffuser unit 20 of the air guide 17 by ultrasonic welding, vibration welding, or adhesion.

  The operation will be described with the above configuration. Since the rectifying unit 61 is fixed to the stationary blade 26 of the air guide 17, the diffuser unit 20 is formed with the air guide 17 on three sides and the rectifying unit 61 on the other side without any gaps. Therefore, the air flow discharged from the impeller 16 passes through the diffuser part 20 without leaking to the adjacent diffuser part 20. Therefore, the leakage loss in this portion can be reduced, and the loss can be further reduced, and the electric blower 1 with high efficiency can be realized.

(Embodiment 3)
Next, a third embodiment of the present invention will be described with reference to FIG. Note that the same components as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 5, the rectifying unit 61 is generally formed of a material called a sound absorbing material, for example, a porous urethane material having innumerable bubbles inside, or a rubber material having an empty layer inside.

  The operation will be described with the above configuration. The air flow transferred from the impeller 16 changes the flow direction along the R shape of the inner surface of the rectifying unit 61. At this time, the sound of the air flow is sound absorption. The highly rectifying unit 61 is somewhat absorbed and suppressed from being discharged to the outside of the electric blower 1. Therefore, noise reduction in this portion can be achieved, and the electric blower 1 with suppressed noise can be realized.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described with reference to FIG. Note that the same components as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 6 shows an electric blower 1 incorporated in an electric vacuum cleaner. 101 is a vacuum cleaner body having a dust collection chamber 102 in the front and a motor chamber 103 in the rear, and the dust collection chamber 102 has a dust collection chamber 102. A paper bag 104 for dust is attached.

  In addition, the electric blower 1 is held on the outer peripheral side surface of the fan case 18 by a holding member A105 formed of an elastic material such as rubber having high vibration proofing properties, and the anti-load side bracket 12 is held by a similar holding member B106. The rear side is held and incorporated in the motor chamber 103 of the cleaner body 101. In addition, the electric blower 1 is provided with a rectifying unit 61 on the inner surface of the fan case 18. Moreover, the arrow in a figure has shown the flow of air.

  The operation in the above configuration will be described. As in the first embodiment, when electric power is supplied, the electric blower 1 is driven and air is sucked from the front of the cleaner. Then, the air flow passes through the diffuser portion 20 of the air guide 17 and is discharged from the exhaust port 19 of the non-load side bracket 12.

  At this time, since the efficiency of the electric blower 1 is improved for the same reason as in the first embodiment, the suction force of the cleaner body 101 is also increased.

  As described above, according to the present embodiment, a highly efficient and low-noise electric blower 1 is mounted, and a vacuum cleaner with high suction force and reduced noise can be obtained. In addition, the room can be cleaned efficiently with low noise.

  As described above, since 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 and the suction work rate of the electric vacuum cleaner, the household electric appliance using the electric blower It can be applied to a wide range of applications such as industrial equipment.

The fragmentary sectional view of the electric blower which shows the 1st Embodiment of this invention Cross section of the main part of the electric blower Partial sectional view of an electric blower showing the other embodiment Partial sectional drawing of the electric blower which shows the 2nd Embodiment of this invention Sectional drawing of the principal part of the electric blower which shows the 3rd Embodiment of this invention Sectional drawing of the vacuum cleaner which shows the 4th Embodiment of this invention Sectional drawing which shows the conventional vacuum cleaner Partial sectional view showing the electric blower Partial sectional view showing an example of another electric blower

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric blower 2 Stator 5 Rotor 6 Shaft 12 Anti-load side bracket 13 Carbon brush 15 Motor 16 Impeller 17 Air guide 18 Fan case 19 Exhaust port 20 Diffuser part 21 Flow change part 22 Return path 24 Intake port 25 Opening part 61 Rectification part

Claims (9)

A motor having a rotor rotatably held; a shaft that is an output shaft of the rotor; an impeller provided on the shaft; an air guide that forms a ventilation path on an outer periphery of the impeller; and the air guide; An electric blower comprising a fan case that covers the impeller, and provided with a rectification unit on the inner surface of the fan case for changing the direction of the air that has passed through the ventilation path. The electric blower according to claim 1, wherein an opening for discharging exhaust air from the impeller is provided on an outer periphery of the fan case. The electric blower according to claim 1 or 2, wherein the rectifying unit is press-fitted and fixed to the inner surface of the fan case. The electric blower according to claim 1 or 2, wherein the rectifying unit is configured to be bonded and fixed to the inner surface of the fan case. The electric blower according to claim 1, wherein the rectifying unit is configured to be welded and fixed to the inner surface of the fan case. The electric blower according to claim 1, wherein the rectifying unit is configured to be bonded and fixed to the air guide. The electric blower according to claim 1, wherein the rectifying unit is configured to be welded and fixed to the air guide. The electric blower according to any one of claims 1 to 7, wherein the rectifying unit is formed of a material having sound absorption performance. The vacuum cleaner provided with the electric blower of any one of Claims 1-8.

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