JP2006250016A - Electric blower and vacuum cleaner using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric blower capable of achieving high efficiency and reducing noise. <P>SOLUTION: This electric blower is provided with a motor 15 having a rotor 5, an impeller 16 attached to a shaft 6 of the rotor 5, an air guide 17 having a plurality of stationary blades 26 positioned in an outer peripheral part of the impeller 16 and forming a ventilation passage, a fan case 18 for covering the air guide 17 and the impeller 16, and an annular body 61 having a round shape on an inner face and arranged among the fan case 18 and the stationary blades 26. This electric blower is provided with an opening part 25 covering up to a tip on an inner peripheral side of the stationary blade 26 at the inner periphery of a top face part of the annular body 61, letting the inner face of the annular body 61 adhere closely to the tip of the stationary blade 26, and being continuous with a terminal having a round shape. Since air stream exhausted by the impeller 16 flows smoothly without leaking through a minute clearance between the stationary blade 26 and the fan case 18, flowing into adjacent diffuser parts 20, and being greatly disturbed, loss due to air leakage is reduced, and efficiency of the electric blower is improved. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

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

  The configuration of a conventional electric blower will be described with reference to FIGS.

  As shown in FIGS. 7 and 8, the electric blower 1 includes an armature winding (on the stator 2 formed by applying field winding (omitted) to the field core 3 and an armature core 7 passed through the shaft 6. (Schematic diagram) 8 is provided, and a commutator 9 is arranged coaxially and is provided with a rotor 5 rotatably fixed by bearings 10 provided at both ends of a shaft 6. 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 installed by inserting a pair of carbon brushes (not shown) into the anti-load side bracket 12 via the deformed pipe 14. Forming. 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 section 20 has a plurality of passages, the flow changing section 21 guides the flow to the lower surface of the air guide 17, and the return path 22. And the fan case 18 is attached so that these may be covered, and the electric blower 1 is formed. A plurality of slits 25 are provided on the outer periphery of the fan case 18. Reference numeral 24 denotes an intake port.

In the above configuration, when electric power is supplied, the current flowing through the field winding is transmitted to the commutator 9 through the carbon brush, and between the magnetic flux generated in the field core 3 and the current passing through the armature winding 8. A force is generated 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 and discharged from the impeller 16. A part of the air accelerated by the impeller 16 is linearly discharged from a plurality of slits 25 provided on the outer periphery of the fan case 18. Further, part of the increased air passes through the diffuser portion 20 of the air guide 17 and is decelerated and enters the flow changing portion 21, the direction is changed by approximately 180 degrees, passes through the return passage 22, and goes to the motor 15. It is guided. If the inner surface R shape of the fan case 18 can be set large, when the direction of air flow is changed by 180 degrees, the direction change is performed smoothly and loss can be reduced. And after that, while cooling the rotor 5, the stator 2, and the carbon brush, it discharges | emits from the exhaust port 19 of the anti-load side bracket 12 (refer patent document 1).
Japanese Utility Model Publication No. 61-47964

  However, in the configuration of the conventional electric blower, the accelerated air discharged from the impeller 16 passes through the diffuser portion 20 of the air guide 17 and goes to the return passage 22, but a part of the air is air guide 17. Enters the minute gap between the stationary blade 26 and the fan case 18 and leaks to the adjacent diffuser portion 20 to generate a loss. A part of the air does not flow into the diffuser 20 after being discharged from the impeller 16, but passes through a clearance portion between the outer periphery of the impeller 16 and the inner periphery of the stationary vane 26 of the air guide 17, and the fan case above the impeller 16. 18 enters the space 18 and circulates to the entrance 28 of the impeller 16, significantly increasing loss and hindering efficiency improvement.

  Further, if a plurality of slits 25 are provided on the outer periphery of the fan case 18 to discharge a part of the linearly accelerated air and reduce the loss, if the area of the slit 25 can be enlarged, the efficiency is increased accordingly. However, in order to form the slit 25 by processing the fan case 18 without the slit 25, the fan case 18 is restricted to the height direction of the slit 25 and the area is to be increased. It is necessary to set the R dimension of the inner surface small. If the inner surface R dimension of the fan case 18 is increased, it is difficult to increase the area of the slit 25 in the height direction. Therefore, it is very difficult to simultaneously increase the shape of the inner surface R of the fan case 18 and increase the opening area of the slit 25.

  This invention solves the said subject, and it aims at providing the electric blower which is highly efficient and can also reduce noise, and the vacuum cleaner carrying it.

  In order to solve the conventional problems, an electric blower of the present invention is attached to a motor having a rotor rotatably held by a load side bracket and an anti-load side bracket, and a shaft that is an output shaft of the rotor. An impeller, a plurality of stationary blades positioned on the outer periphery of the impeller, and an air guide that forms a ventilation path, and a fan case that covers the air guide and the impeller, the inner surface of the fan case and the static An annular body is disposed between the blades, and the annular body has an R-shaped inner surface so as to be in close contact with the tip of the stationary blade, and an opening for exhausting exhaust air from the impeller to the outer periphery of the fan case This opening is provided so as to continue to the R-shaped end of the annular body, and the air flow discharged by the impeller leaks through a minute gap between the stationary blade and the fan case, Since it flows smoothly without flowing into the matching diffuser part, the loss of leakage is reduced, and part of the airflow sucked by the impeller is smoothly discharged from the opening along the inner surface R shape of the annular body The efficiency is good and the efficiency of the electric blower is improved.

  Moreover, the vacuum cleaner of this invention is equipped with the dust collection chamber which collects dust, and the electric blower of any one of Claims 1-6, and mounts an electric blower in a vacuum cleaner. Thereby, the suction performance of a vacuum cleaner can be improved and a highly usable vacuum cleaner can be provided.

  The electric blower of the present invention has high efficiency and can realize high suction performance. Moreover, the vacuum cleaner which mounts this electric blower has a high suction work rate and is excellent in usability.

  A first invention includes a motor having a rotor rotatably held by a load side bracket and an anti-load side bracket, an impeller attached to a shaft which is an output shaft of the rotor, and an outer peripheral portion of the impeller An air guide that forms a ventilation path and a fan case that covers the air guide and the impeller, and an annular body is disposed between the inner surface of the fan case and the stationary blade. The annular body has an R-shaped inner surface and is brought into close contact with the tip of the stationary blade, and an opening for exhausting exhaust air from the impeller is provided on the outer periphery of the fan case. The air flow discharged by the impeller leaks through a small gap between the stationary blade and the fan case and does not flow into the adjacent diffuser part. Since it flows smoothly, the loss of leakage is reduced, and a part of the airflow sucked by the impeller is discharged smoothly from the opening along the inner surface R shape of the annular body, so that the efficiency of the electric blower is high. Will improve.

In the second invention, in particular, the inner circumference of the top surface portion of the annular body of the first invention is extended to a position close to or in contact with the outer circumference of the impeller, and the suction performance can be improved.

In the third invention, in particular, the annular body of the first or second invention is formed of a material having elasticity, and leakage to the upper side of the impeller can be prevented, and the suction performance can be improved.

In the fourth invention, in particular, the annular body according to any one of the first to third inventions is formed of a resin excellent in slipperiness, and can prevent air leakage above the impeller and mechanical loss. Therefore, the suction performance can be further improved.

According to a fifth aspect of the present invention, the annular body according to any one of the first to fourth aspects is formed of a resin having excellent machinability, so that leakage upward of the impeller can be prevented and mechanical loss can be reduced. Therefore, the suction performance can be further improved.

A sixth invention comprises a dust collection chamber for collecting dust and the electric blower according to any one of claims 1 to 5 , and is an electric fan that is highly efficient and excellent in suction performance. By mounting on a vacuum cleaner, the suction performance of the vacuum cleaner can be improved and a highly usable 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)
FIG. 1 is a partial cross-sectional view of the electric blower according to the first embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part of the electric blower. The same components as those in the conventional example are given the same reference numerals, and the description thereof is omitted.

  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 17 a is disposed on the outer periphery of the impeller 16, and the air guide 17 is adjacent to the surface. A diffuser portion 20 having a plurality of passages constituted by the matching stationary blades 26, a flow changing portion 21 for guiding 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.

  Further, as shown in FIG. 2, 61 is an annular body formed in an annular shape, the outer periphery of the annular plane is curved, and an R shape is provided on the inner surface to form an arcuate cross section. Located between the cases 18 and fixed to the air guide 17 by a method such as bonding, the inner surface of the stationary blade 26 of the air guide 17 and the inner surface of the annular body 61 have no gap and are also in close contact with the inner surface of the fan case 18. . The innermost periphery of the planar portion of the annular body 61 covers the range up to the most distal end (inner diameter side) of the stationary blade 26 of the air guide 17. A plurality of slits 25 are provided on the outer periphery of the fan case 18 as shown in FIG.

  The operation in the above configuration will be described. When electric power is supplied, the current flowing 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, it is decelerated and enters the flow changing portion 21, part of which flows out of the opening 25 and the rest of 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 discharged from the impeller 16 is guided to the diffuser portion 20, but the diffuser portion 20 that is in close contact with the annular body 61 from the tip (inner diameter side) of the stationary vane 26 is blocked from the adjacent flow path. Since it comprises, the air which entered the diffuser part 20 flows without leaking into the adjacent flow path, so that the loss is reduced.

  In addition, the air that passes through the diffuser portion 20 of the air guide 17 and is decelerated and enters the changing portion 21 flows smoothly along the R shape because the inner surface of the annular body 61 has an R shape. Since the opening 25 is provided at the end of the shape, the air flowing along the R shape is smoothly discharged to the outside without disturbing the flow, and the loss due to the flow resistance is greatly reduced. The

  As described above, according to the present embodiment, since leakage at the diffuser portion 20 of the air guide 17 is prevented and the turbulence of the flow is reduced, the loss can be greatly reduced, and an efficient electric blower. 1 can be realized.

(Embodiment 2)
FIG. 3 is a cross-sectional view of a main part of the electric blower according to the second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the present embodiment, as shown in FIG. 3, the innermost periphery of the flat portion of the annular body 61 extends further to the inner diameter side than the range up to the forefront (inner diameter side) of the stationary blade 26 of the air guide 17. Further, it is protruded to the vicinity of the outer periphery of the impeller 16 or the range in contact with the outer periphery of the impeller 16.

  With the above configuration, the annular body 61 prevents the air discharged from the outer periphery of the impeller 16 from flowing upward of the impeller 16, so that the air discharged from the outer periphery of the impeller 16 circulates to the inlet portion 28 of the impeller 16. Can be prevented. Accordingly, the loss can be further reduced and the electric blower 1 with high efficiency can be realized.

  In order to securely fill the clearance between the outer periphery of the impeller 16 and the stationary blade 26 of the air guide 17, the inner diameter of the annular body 61 is set somewhat smaller than the outer diameter of the impeller 16, and the outer periphery of the impeller 16 and the annular body 61 are set. The most reliable way is to contact the inner circumference.

  Therefore, as shown in FIG. 4, if the annular body 61 is formed of elastic rubber or thin resin and the annular body 61 and the impeller 16 are brought into contact with each other, it is possible to reliably prevent the airflow from recirculating. Can do.

  Further, if the impeller 16 rotates while coming into contact with the annular body 61, a mechanical loss occurs and the efficiency of the electric blower 1 is reduced. Therefore, the annular body 61 is made of a resin material having excellent slidability. Thus, it is possible to reduce the mechanical loss during rotation, and the efficiency can be further increased.

  By the way, it is best to set the outer diameter dimension of the impeller 16 and the inner diameter dimension of the annular body 61 so that they do not come into contact with each other and the clearance is minimized. Since the variation in the diameter, the variation in the inner diameter of the annular body 61, the variation in the concentricity of the impeller 16 and the annular body 61 at the time of assembly, etc., it is impossible to provide an optimum clearance over the entire circumference of the impeller 16. .

  Therefore, as shown in FIG. 5, the annular body 61 is made of a resin material having excellent machinability, the inner diameter is set slightly smaller than the outer diameter of the impeller 16, and the initial impeller 16 at the time of assembly of the electric blower 1 is set. With this rotation, the inner periphery of the annular body 61 is scraped only at the portion where the annular body 61 and the impeller 16 are in contact with each other, the clearance is minimized, and the mechanical loss during the rotation after the initial stage can be reduced. , Can increase efficiency.

  Needless to say, the above-described effect can be obtained even if the annular body 61 is on a flat surface having no curved portion on the outer peripheral portion.

(Embodiment 3)
FIG. 6 is a cross-sectional view of the electric vacuum cleaner according to the third embodiment of the present invention. Note that the same components as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In this embodiment, the electric blower 1 described in the first and second embodiments is mounted on a vacuum cleaner, and as shown in FIG. The main body of the vacuum cleaner includes a motor chamber 103 at the rear, and a dust collection paper bag 104 is mounted in the dust collection chamber 102.

  Further, the electric blower 1 has the outer peripheral side surface of the fan case 18 held by a holding member A105 formed of a resilient 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. An annular body 61 is provided on the inner surface of the fan case 18 of the electric blower 1. Moreover, the arrow in a figure has shown the flow of air.

  The operation of the electric vacuum cleaner 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 main body 101. 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 high 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.

Half sectional view of the electric blower in the first embodiment of the present invention The main part enlarged sectional view of the electric blower The principal part expanded sectional view of the electric blower in the 2nd Embodiment of this invention The principal part expanded sectional view of the electric blower which shows other forms Furthermore, the principal part expanded sectional view of the electric blower which shows a form Sectional drawing of the vacuum cleaner in the 3rd Embodiment of this invention Half sectional view showing a conventional electric blower Half sectional view showing an example of another conventional electric blower

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric blower 2 Stator 5 Rotor 6 Shaft 11 Load side bracket 12 Anti-load side bracket 15 Motor 16 Impeller 17 Air guide 17a Ventilation path 18 Fan case 19 Exhaust port 20 Diffuser part 21 Flow change part 22 Return path 24 Intake port 25 Opening part 26 Stator Blade 61 Ring

Claims (6)

A motor having a rotor rotatably held by a load side bracket and an anti-load side bracket, an impeller attached to a shaft that is an output shaft of the rotor, and a plurality of stationary blades positioned on an outer peripheral portion of the impeller And an air guide that forms a ventilation path, and a fan case that covers the air guide and the impeller, and an annular body is disposed between an inner surface of the fan case and the stationary blade, An inner surface is formed in an R shape so as to be in close contact with the tip of the stationary blade, and an opening for exhausting exhaust air from the impeller is provided on the outer periphery of the fan case, and this opening is connected to the R-shaped end of the annular body. The electric blower provided in The electric blower according to claim 1 or 2, wherein the inner periphery of the top surface portion of the annular body is extended to a position close to or in contact with the outer periphery of the impeller. The electric blower according to any one of claims 1 to 3, wherein the annular body is formed of a material having elasticity. The electric blower according to any one of claims 1 to 4, wherein the annular body is formed of a resin excellent in slipperiness. The electric blower according to any one of claims 1 to 5, wherein the annular body is formed of a resin excellent in machinability. The vacuum cleaner provided with the dust collection chamber which collects dust, and the electric blower of any one of Claims 1-6.

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