JP2013007339A - Electric blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric blower that can reduce a mechanical loss while maintaining the airtightness of a blade with a fan cover.SOLUTION: The electric blower 1 includes: a plurality of radially-extending internal rotor blade half bodies 57; a resin internal fan half body 55 that is provided at the rotation center and has intermediate plates 62 for dividing a flow passage 61 between the internal rotor blade half bodies 57 into multistages in a rotation center line direction all over the adjoining internal rotor blade half bodies 57; a plurality of metal external rotor blade half bodies 56 that are radially extending to contact with the internal rotor blade bodies 57; and a centrifugal fan 6 that rotatably fixes the internal fan half bodies 55 integrally to the external rotor blade half bodies 56.

Description

  Embodiments according to the present invention relate to an electric blower.

  2. Description of the Related Art There is known an electric vacuum cleaner including a turbo fan that has a multistage flow path in the direction of a rotation center line by passing an intermediate plate between moving blades.

JP 2008-309057 A

  With the need for miniaturization of electric vacuum cleaners, which are the main uses of electric blowers, there is an increasing demand for miniaturization of electric blowers.

  By the way, the electric blower mainly includes a turbo fan and an electric motor that drives the turbo fan. In the case of a conventional electric blower, the electric motor has a generally cylindrical appearance, and the turbofan has a disk-shaped appearance that is larger in diameter and flat than the electric motor.

  Therefore, in order to meet the demand for miniaturization of the electric blower, it is extremely important to reduce the size of the turbo fan (particularly, the size in the radial direction) that has a larger diameter than the electric motor. By reducing the radial dimension of the turbofan, the radial dimension of the electric blower is dramatically reduced.

  On the other hand, in order to maintain performance while reducing the size of the turbofan, it is necessary to increase the rotational speed of the turbofan and increase the flow path width.

  However, when the flow path width is increased, that is, when the height of the moving blade (the distance corresponding to the separation distance between the front shroud and the rear ruloud) is increased, there is a high possibility that the noise of the turbofan increases. Therefore, it is conceivable to reduce the noise by passing an intermediate plate between the rotor blades and dividing the multistage flow path in the direction of the rotation center line as in a conventional electric blower.

  However, it is not preferable to manufacture a turbofan having a multi-stage flow path with a thin metal plate because it requires a lot of labor in terms of assemblability and increases the burden on cost.

  On the other hand, it is possible to manufacture a turbofan having a multistage flow path with a resin that can be easily molded, but the strength and rigidity of the turbofan are insufficient with respect to an increase in the rotational speed of the turbofan.

  Therefore, the present invention proposes an electric blower that has good assemblability and can cope with a high rotation accompanying a reduction in size.

  In order to solve the above-described problem, an electric blower according to an embodiment of the present invention includes a plurality of radially inner blade half bodies and a flow path between the inner blade half bodies across the adjacent inner blade half bodies. A resin inner fan half on the rotation center side, and a metal and a plurality of outer movements radially extending in connection with the inner rotor blade half. A blade half, and an impeller that fixes the inner fan half and the outer blade half in a rotationally integrated manner.

The longitudinal section showing the electric blower concerning the embodiment of the present invention. The perspective view which shows the centrifugal fan of the electric blower which concerns on this invention. The perspective view which shows the centrifugal fan of the electric blower which concerns on this invention. The disassembled perspective view which shows the centrifugal fan of the electric blower which concerns on this invention. The perspective view which shows the inner side fan half body of the centrifugal fan of the electric blower which concerns on this invention. The enlarged view which shows the blade | wing of the electric blower which concerns on this invention.

  An embodiment of an electric blower according to the present invention will be described with reference to FIGS.

  FIG. 1 is a longitudinal sectional view showing an electric blower according to an embodiment of the present invention.

  As shown in FIG. 1, an electric blower 1 according to this embodiment includes an electric blower case 3 as an outer shell, a centrifugal fan 6 as an impeller having a plurality of blades 5 as moving blades, and a centrifugal fan 6. A rectifying plate 9 having a plurality of upstream rectifying plates 8 as stationary vanes surrounding the blade and facing the blades 5, and a motor unit 11 that rotationally drives the centrifugal fan 6 are provided.

  The electric blower case 3 covers the centrifugal fan 6 and the rectifying plate 9 and has a fan cover 13 having a second suction port 12 positioned substantially concentrically with the rotation axis C of the centrifugal fan 6, a motor unit 11 and a discharge port 15. And a rectifying plate support ring 17 sandwiched between the fan cover 13 and the motor case 16.

  In order to facilitate the description, the front and rear directions of the electric blower 1 will be described below with the second suction port 12 side of the rotation axis C of the centrifugal fan 6 as the front. In FIG. 1, a solid arrow X is directed from the rear to the front of the electric blower 1.

  The fan cover 13 is a bottomed cylindrical outer shell having an opening 18 that opens the bottom on the rear side. The fan cover 13 has a second suction port 12 at the approximate center of the bottom wall on the front side. The second suction port 12 is an opening that guides air from the outside of the electric blower 1 to the centrifugal fan 6, and is a circular opening that is substantially concentric with the rotation axis C of the centrifugal fan 6.

  The motor case 16 is a bottomed cylindrical outer shell having an opening 19 that opens the bottom on the front side. The electric motor case 16 includes a cylindrical motor head portion 22 that protrudes rearward from the approximate center of the bottom wall 21 on the rear side. The motor head unit 22 holds a bearing 23 on the inner peripheral surface. The bottom wall 21 of the motor case 16 has a discharge port 15 that leaves a cross-shaped beam portion that supports the motor head portion 22 in the center and opens the other portions.

  The current plate support ring 17 includes a longitudinal plate-shaped current plate support bridge portion 25 that bridges the inside of the fan cover 13. The rectifying plate support bridge portion 25 holds the rectifying plate 9 in the fan cover 13. The rectifying plate support bridge portion 25 includes a cylindrical bearing holding portion 26 that protrudes forward around the rotation axis C of the centrifugal fan 6. The bearing holder 26 holds a bearing 27 on the inner peripheral surface. The bearing holder 26 has a through-hole 29 through which the rotor shaft 28 passes. The rectifying plate support bridge portion 25 partially blocks the opening 19 of the motor case 16, but the non-blocking portion of the opening 19 that is not closed by the rectifying plate support bridge portion 25 is interposed through the inside of the rectifying plate support ring 17. The space inside the fan cover 13 and the space inside the motor case 16 are fluidly connected.

  The rectifying plate support ring 17 includes a flange 30 that fixes the motor case 16.

  In the electric blower case 3, the rectifying plate support ring 17 is fitted into the opening 18 of the fan cover 13, and the front end of the electric motor case 16 is fixed to the flange 30 on the outer periphery of the rectifying plate support ring 17 to partition the inner and outer spaces.

  The centrifugal fan 6 includes a disk-shaped first plate 31, an annular second plate 33 having a first suction port 32 in the approximate center and spaced from the first plate 31, and the first plate 31 and the second plate. And a plurality of blades 5 extending between the first and second blades 33. The centrifugal fan 6 is a turbo fan in which the exit angle of the blades 5 faces backward.

  The first plate 31 is a so-called rear shroud, and has an insertion hole 35 for fixing the entire centrifugal fan 6 to the rotor shaft 28 extending from the motor unit 11 at a substantially central position.

  The second plate 33 is a so-called front shroud, and is an annular plate having the first suction port 32 as an inner periphery and an outer diameter substantially equal to that of the first plate 31. The second plate 33 has an inner peripheral edge 33a, which is an opening edge of the first suction port 32, located near the second suction port 12 of the fan cover 13, and has a trumpet-shaped curve that gradually widens toward the outer periphery and rearward. It is a board. The first suction port 32 is a circular opening that is opposed to the second suction port 12 of the fan cover 13, is substantially concentric with the rotational axis C of the centrifugal fan 6, and is slightly larger than the second suction port 12.

  The blade 5 is located in an annular region extending from the opening edge of the first suction port 32 (that is, the inner peripheral edge 33a of the second plate 33) to the outer periphery of the first plate 31 and the second plate 33. It extends radially in the radial direction (orthogonal direction) of the rotation axis C passing through the approximate center of the two plates 33. When viewed from the direction of the rotation axis C, the blades 5 are spirally curved and are separated from each other at substantially equal intervals. The flow path surrounded and partitioned by the first plate 31, the second plate 33 and the blade 5 is referred to as an inter-blade flow path 36, and the flow path from the first suction port 32 to the inter-blade flow path 36 is referred to as an inlet flow path 37. Call.

  The centrifugal fan 6 rotates in the direction opposite to the vortex wound by the blades 5.

  The motor unit 11 includes a rotor shaft 28 in the electric motor case 16 extending in the front-rear direction, a rotor 38 that is integrally rotated with the rotor shaft 28, and a stator 39 that is fixed to the electric motor case 16 and surrounds the rotor 38. And a pair of brush mechanisms 41 that sandwich the rotor shaft 28 through the side portions of the motor case 16.

  The rotor shaft 28 is rotatably supported on the rotation axis C by bearings 23 and 27.

  The pair of brush mechanisms 41 oppose each other with the commutator 42 of the rotor 38 on the rotor shaft 28 interposed therebetween. Each brush mechanism 41 includes a carbon brush 43 that is in contact with the commutator 42 and a brush holder 45 that holds the carbon brush 43 so that it can appear and retract. The brush holder 45 presses the carbon brush 43 against the commutator 42 and obtains mutual conduction.

  The rectifying plate 9 is located between the centrifugal fan 6 and the rectifying plate support bridge portion 25 and smoothly guides the air discharged from the centrifugal fan 6 into the rectifying plate support ring 17 and thus into the electric motor case 16. The rectifying plate 9 includes a substantially disc-shaped rectifying plate main body 46, a plurality of upstream rectifying plates 8 extending on the surface (front surface) of the rectifying plate main body 46 on the centrifugal fan 6 side, and the rectifying plate main body 46 on the motor unit 11 side. A plurality of downstream rectifying plates 47 extending on the surface (rear surface). The rectifying plate 9 has a slightly smaller diameter than the inner diameter of the fan cover 13, and separates a gap between the rectifying plate 9 and the fan cover 13. This gap guides the air discharged from the outer periphery of the upstream rectifying plate 8 to the downstream rectifying plate 47.

  The current plate main body 46 has a diameter larger than the diameter of the centrifugal fan 6. The current plate main body 46 has a substantially circular through hole 48 into which the bearing holding portion 26 of the current plate support ring 17 is fitted.

  The upstream rectifying plate 8 is slightly spaced from the outer periphery of the centrifugal fan 6 and surrounds the centrifugal fan 6 and faces the blade 5 or the inter-blade flow path 36. Each upstream rectifying plate 8 protrudes substantially vertically from the rectifying plate main body 46 toward the front of the electric blower 1. The upstream rectifying plate 8 is spirally viewed from the direction of the rotation axis C and extends side by side at substantially equal intervals.

  The space sandwiched between the upstream rectifying plates 8 is a guide air passage 49 that guides the air discharged from the centrifugal fan 6 to the outer peripheral side of the rectifying plate 9 and gradually becomes wider. The direction of the vortex wound by the upstream rectifying plate 8 faces the opposite direction of the vortex wound by the blade 5.

  The downstream rectifying plate 47 is located on the outer peripheral side of the rectifying plate main body 46. Each downstream rectifying plate 47 protrudes substantially vertically from the rectifying plate main body 46 toward the rear of the electric blower 1. Each of the downstream rectifying plates 47 is spirally viewed from the direction of the rotation axis C, and extends away from each other at substantially equal intervals.

  A space sandwiched between the respective downstream rectifying plates 47 is an airflow passage 51 that guides air from the gap between the rectifying plate 9 and the fan cover 13 to the rectifying plate support ring 17 and eventually to the motor case 16. The direction of the vortex wound by the downstream rectifying plate 47 faces the opposite direction of the vortex wound by the upstream rectifying plate 8.

  2 and 3 are perspective views showing a centrifugal fan of the electric blower according to the present invention.

  FIG. 4 is an exploded perspective view showing a centrifugal fan of the electric blower according to the present invention.

  FIG. 5 is a perspective view showing an inner fan half of the centrifugal fan of the electric blower according to the present invention.

  2 is a perspective view of the centrifugal fan 6 with a quarter cut away, and FIG. 3 is a perspective view of the centrifugal fan 6 with the second plate 33 removed.

  As shown in FIGS. 2 to 5, the centrifugal fan 6 of the electric blower 1 according to this embodiment is connected to the inner fan half 55 on the rotation center side close to the rotation axis C and the periphery of the inner fan half 55. A plurality of outer rotor blade halves 56. The centrifugal fan 6 is rotationally fixed integrally with the inner fan half 55 and the outer rotor blade half 56 sandwiched between the first plate 31 and the second plate 33.

  The inner fan half 55 extends between a plurality of radially inner blade half 57 and the inner blade half 57 adjacent to each other. And an intermediate plate 62 that divides the inner half part in multiple stages in the direction of the rotation center line. The inner fan half 55 is a resin member that integrally molds the inner rotor blade half 57 and the intermediate plate 62, and both long sides of the inner rotor blade half 57 are respectively connected to the first plate 31 or the second plate 33. The outermost edge of the inner rotor blade half 57 is abutted against the innermost edge of the outer rotor blade half 56 and fixed.

  The outer rotor blade half 56 is connected to the inner rotor blade half 57 and extends radially. Each outer rotor blade half 56 is a strip-shaped elongated metal plate, and both long sides are fixed to the slits of the first plate 31 or the second plate 33 by a method such as caulking.

  One of the inner rotor blade halves 57 and the outer rotor blade half 56 connected to the inner rotor blade half 57 is one of the blades 5 of the centrifugal fan 6. The inner rotor blade half 57 is an inner peripheral half of the blade 5, and the outer rotor blade half 56 is an outer peripheral half of the blade 5.

  FIG. 6 is an enlarged view showing blades of the electric blower according to the present invention.

  As shown in FIG. 6, the blade 5 of the electric blower 1 according to the present embodiment extends with the innermost edge of the outer moving blade half 56 connected to the outermost edge of the inner moving blade half 57. The abutting surface 63 where the inner rotor blade half 57 and the outer rotor blade half 56 are connected is an inclined surface with respect to the extending direction of the rotor blade halves 56, 57. The centrifugal force Fr acting on the outermost edge of the inner rotor blade half 57 is supported by the innermost edge of the outer rotor blade half 56.

  Specifically, the abutting surface 63 is inclined so that the innermost edge of the outer moving blade half 56 precedes the outermost edge of the inner moving blade half 57 in the rotation direction of the blade 5. Accordingly, the innermost edge of the outer rotor blade half 56 is located at the outer diameter position of the outermost edge of the inner rotor blade half 57, and the inner motion that tends to fall in the radially outward direction due to the centrifugal force accompanying the rotation R of the centrifugal fan 6. Supports the outermost edge of the wing half 57.

  The electric blower 1 of the present embodiment increases the flow path width of the inter-blade flow path 36 by increasing the blade 5, and reduces the diameter of the centrifugal fan 6 by increasing the flow path width of the inter-blade flow path 36. Can be planned. The electric blower 1 can reduce the diameter of the fan cover 13 by reducing the diameter of the centrifugal fan 6, and the electric blower case 3 can be slimmed into a substantially uniform cylindrical shape, thereby reducing the size of the entire electric blower 1. .

  In addition, the electric blower 1 of the present embodiment compensates for the decrease in performance associated with the reduction in the diameter of the centrifugal fan 6 by increasing the rotational speed of the centrifugal fan 6 as the flow path width of the inter-blade flow path 36 is increased. This increase in the rotational speed of the centrifugal fan 6 increases the centrifugal force acting on the centrifugal fan 6. Therefore, the electric blower 1 according to the present embodiment corresponds to the increase in centrifugal force by arranging the metal outer moving blade half 56 on the outer peripheral side of the blade 5. The electric blower 1 can include the blades 5 that are extremely robust as compared with the case where the entire blades 5 are made of resin.

  On the other hand, the electric blower 1 may cause a large pressure change due to the air flowing into the inter-blade channel 36 from the first suction port 32 of the centrifugal fan 6 due to an increase in the rotational speed of the centrifugal fan 6, and may increase noise. Therefore, the electric blower 1 includes an intermediate plate 62 that divides the inner half of the inter-blade channel 36 into multiple stages. The electric blower 1 rectifies the air flowing into the inter-blade channel 36 from the first suction port 32 by the intermediate plate 62, suppresses pressure fluctuation, and suppresses noise generation.

  Furthermore, the electric blower 1 of the present embodiment includes the inner fan half 55 that is an integrally molded product made of resin, thereby eliminating the labor required for assembling the intermediate plate 62 and the inner rotor blade half 57. To improve the assembly. Moreover, the electric blower 1 has the outer fan blade half 56 and the inner fan half by disposing the inner fan half 55 on the inner peripheral side of the centrifugal fan 6 where the centrifugal force does not increase too much even when the rotational speed of the centrifugal fan 6 increases. It is possible to optimize the strength burden and the rigidity burden by the half body 55, and to optimize by adjusting the connection position.

  Furthermore, the electric blower 1 according to the present embodiment supports the outermost edge portion of the inner moving blade half 57 that is most susceptible to the centrifugal force in the inner fan half 55 by the outer moving blade half 56. The deformation of the flow path 36 can be suppressed and the performance of the centrifugal fan 6 can be maintained, and the strength of the centrifugal fan 6 as a whole can be improved.

  Therefore, according to the electric blower 1 which concerns on this embodiment, assembly property is favorable and it can respond to the high rotation accompanying size reduction.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Electric blower 3 Electric blower case 5 Blade 6 Centrifugal fan 8 Upstream current plate 9 Current plate 11 Motor part 12 Second suction port 13 Fan cover 15 Discharge port 16 Motor case 17 Current plate support ring 18 Opening 19 Opening 21 Bottom wall 22 Motor Head portion 23 Bearing 25 Current plate support bridge portion 26 Bearing holding portion 27 Bearing 28 Rotor shaft 29 Through port 30 Flange 31 First plate 32 First suction port 33 Second plate 33a Inner peripheral edge 35 Insertion hole 36 Inter-blade channel 37 Inlet passage 38 Rotor 39 Stator 41 Brush mechanism 42 Commutator 43 Carbon brush 45 Brush holder 46 Rectifier plate body 47 Downstream rectifier plate 48 Through hole 49 Guide air passage 51 Overflow air passage 55 Inner fan half 56 Outside movement Blade half 57 Inner rotor blade half 61 Channel 62 Middle plate 63 Abutting surface

Claims (2)

A center of rotation having a plurality of radially inner blade halves and an intermediate plate that divides a flow path between the inner blade half halves in multiple stages in the direction of the rotation center line across the adjacent inner blade half A plastic inner fan half on the side,
A plurality of radially outer metal blades connected to the inner blade half and extending radially;
An electric blower comprising: an impeller that rotatably and integrally fixes the inner fan half and the outer rotor blade half. The abutting surface where the inner moving blade half and the outer moving blade half are connected is a surface inclined with respect to the extending direction of the two moving blade halves, and the inner moving blade half is rotated by the rotation of the impeller. The electric blower according to claim 1, wherein a centrifugal force acting on the outermost edge of the outer rotor blade is supported by the innermost edge of the outer rotor blade half.

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