JP6850966B2 - Electric blower and vacuum cleaner - Google Patents

Description

The present invention relates to an electric blower that rotates a fan by a rotational force obtained from an electric motor unit to perform a blowing action, and an electric vacuum cleaner that is operated by mounting the electric blower.

Conventionally, in this type of electric blower, an armature and a field magnet are built in a casing composed of a bracket frame to form an electric motor unit. However, in order to meet the recent demand for smaller size and lighter weight, an electric motor unit has been proposed in which the field core is sandwiched and fixed by a bracket and a frame (or a frame integrated with an air guide) with bolts or the like (for example,). See Patent Document 1).

8 is a half cross-sectional view of the conventional electric blower described in Patent Document 1, FIG. 9A is a plan view of a frame integrated with an air guide of the electric blower, and FIG. 9B is a plan view. , A side view of the frame, FIG. 9C is a back view of the frame.

In FIGS. 8 and 9, the conventional electric blower 40 is roughly classified into a blower portion 42 and an electric motor portion 43, and the blower portion 42 includes a centrifugal fan 2 having a plurality of blades 1 and intake air in the center of the fan 2. It is composed of a fan case 3 having an open hole 3a and a frame 4 integrally formed with an air guide.

The electric motor unit 43 includes an armature 7 (windings omitted) that is press-fitted into the rotating shaft 5 and rotatably supported by a bearing 6, a field 8 arranged on the outer periphery of the armature 7, and a field winding (field windings). A brush unit 9 for energizing and connecting the armature winding (not shown) and the armature winding (not shown) is built in, the field core 10 is sandwiched between the frame 4 and the bracket 11, and the bolt provided in the field core 10 is built in. It is configured by tightening with a bolt 13 and a nut 14 through a notch through hole 12 having a circular shape or a semicircular shape.

The frame 4 integrally formed with the air guide has a housing portion 15 that holds the bearing 6 in the center, an inclined passage portion 16 that rectifies the wind flowing out from the fan 2, and an inclined passage portion 16 that is located under the fan 2 and is inclined with the housing portion 15. A disk-shaped base portion 17 connecting the passage portions 16, an outer cylindrical portion 18 to which the fan case 3 is press-fitted and fixed, and a bolt protruding from the base portion 17 toward the field core 10 and fixed to the field core 10 by bolts 13. It is composed of a fastening portion 19 and a core holding rib 20 for holding the field core 10.

Japanese Unexamined Patent Publication No. 2003-232298

However, in the configuration of the conventional electric blower as described in Patent Document 1, since the field core 10 is fixed at two places of the bolt 13, the field is magnetized at the portion located at 90 degrees with respect to the bolt fastening portion 19. Since there is no portion that supports the core 10, there is a problem that the strength is weak and the vibration is larger than that on the bolted portion 19 side.

Further, since the field core 10 is fixed at two points, the central axis of the frame 4 with respect to the flat surface portion of the field core 10 may be displaced or tilted, which may affect the rotation of the armature 7 and increase the vibration of the electric blower. there were.

Further, since the bolt fastening portion 19 for holding the field core 10 and the core holding rib 20 project from the end surface position of the base portion 17 on the disk toward the field core 10, they are long in length, resulting in increased mass and exhaust air. Not only was it a barrier to the road, but it was also difficult to stably hold the field core 10.

It is possible to increase the number of core holding ribs 20 by enlarging them in order to reliably and stably hold the field core 10, but not only the mass increases, but also it becomes a barrier to the flow of wind and the blowing efficiency decreases. There was a problem to make.

Further, in the above configuration, since the anti-base portion 17 side of the frame 4 is in an open state, most of the exhaust air cools the electric motor portion 43 when the wind passing through the inclined passage portion 16 passes between the return passage ribs 21. Since it is discharged without any treatment, the temperature rise may become a problem.

The present invention solves the above-mentioned conventional problems, and improves the frame shape without adding parts or increasing the material thickness to increase the strength of the frame and prevent the frame central axis from shifting or tilting. It is an object of the present invention to provide an electric blower having both reliability and weight reduction, and an electric vacuum cleaner having both reliability and weight reduction that is operated by mounting the electric blower.

In order to solve the above-mentioned conventional problems, the electric blower of the present invention has a centrifugal fan having a plurality of blades, an air guide for rectifying the air discharged from the fan, and an intake hole in the center covering them. An armor having a blower portion composed of an open fan case or the like, press-fitted into a rotating shaft and rotatably supported by a bearing, a field arranged on the outer periphery of the armor, and the field. A brush unit or the like for energizing and connecting the field windings constituting the field and the armor windings constituting the armature is built in, and the field core constituting the field is sandwiched between the frame and the bracket to form the field core. In an electric blower composed of an electric motor unit that is tightened and fixed with bolts and nuts through a circular or semi-circular notch through hole containing a provided bolt, the frame is located at the center and the bearing is provided. A housing portion to be held, a disk-shaped base portion located under the fan and extending from the housing portion to the outer peripheral portion, an outer peripheral cylindrical portion into which the fan case is press-fitted, and bolting fixed to the field core. It is composed of a portion, a flange portion that comes into contact with the return passage rib of the air guide and extends to the outer peripheral cylindrical portion, and a strut portion that connects the base portion and the flange portion. A core holding rib projecting toward the directional end surface is provided, and the core holding rib is the outermost outer circumference similar to the outer peripheral side shape of the yoke portion of the axial end surface of the field core and the connecting portion between the yoke portion and the teeth portion. It is formed at a position where it abuts on the side and is configured in a series on both sides from the bolted portion. The core holding rib of the frame can support the field core at a short distance from the flange portion, and the core. Since the holding ribs are formed in a substantially U shape, the rigidity of the core holding ribs is increased, the strength of the entire frame can be increased, and the central axis can be prevented from shifting or tilting. It is possible to realize an electric blower that is lightweight and easy to use.

Further, by separately configuring the frame and the air guide, restrictions on the mold such as the drawing direction are reduced, and the degree of freedom in design is increased. In addition, since the material can be set for each part, by using PP material with good moldability and light specific gravity for the air guide, it is possible to form a lightweight volume tribe and improve the ventilation efficiency. By using a PBT material having high heat resistance and strength for the frame, it is possible to further improve the reliability.

The vacuum cleaner according to the fifth invention is equipped with the electric blower according to any one of claims 1 to 4, and can provide a lightweight and highly reliable vacuum cleaner.

Since the strength of the frame is improved, the electric blower of the present invention can provide a highly reliable electric blower or an electric blower having the same reliability and weight reduction. Further, by mounting the electric blower on the vacuum cleaner, it is possible to provide the vacuum cleaner with improved reliability.

Sectional drawing of the electric blower according to Embodiment 1 of this invention Back perspective view of the field core and frame of the electric blower Back perspective view of the frame of the electric blower according to the second embodiment of the present invention. Perspective view showing the relationship between the frame and the field core Cross-sectional view of the frame of the electric blower according to the third embodiment of the present invention. Cross-sectional perspective view of a main part of the frame of the electric blower according to the fourth embodiment of the present invention. Cross-sectional perspective view of the back of the frame Semi-sectional view of a conventional electric blower (A) Plan view of the frame integrated with the air guide of the electric blower, (b) Side view of the frame, (c) Back view of the frame

The first invention comprises a centrifugal fan having a plurality of blades, an air guide that rectifies the wind discharged from the fan, a fan case that covers them and has an intake hole in the center, and the like. An armor having a blower, press-fitted into a rotating shaft and rotatably supported by a bearing, a field arranged on the outer periphery of the armor, a field winding constituting the field, and the armor. It has a built-in brush unit or the like that energizes and connects the armature windings that make up the field, sandwiches the field core that makes up the field between the frame and bracket, and has a circular shape or half that contains the bolts provided in the field core. In an electric blower composed of an electric motor portion that is tightened and fixed with bolts and nuts through a circular notch through hole, the frame is located in the center and holds the bearing portion, and under the fan. A disk-shaped base portion that is located and extends from the housing portion to the outer peripheral portion, an outer peripheral cylindrical portion into which the fan case is press-fitted, a bolt fastening portion fixed to the field core, and a return passage rib of the air guide. It is composed of a flange portion that comes into contact and extends to the outer peripheral cylindrical portion, and a strut portion that connects the base portion and the flange portion, and the flange portion is provided with a core holding rib that protrudes toward the axial end surface of the field core. The core holding rib is formed at a position where it abuts on the outermost outer peripheral side, similar to the outer peripheral side shape of the yoke portion on the axial end surface of the field core and the connecting portion between the yoke portion and the teeth portion, and the bolt. It is composed of a series on both sides from the fastening part, and the core holding rib of the frame can support the field core at a short distance from the flange part, and the core holding rib is formed in a substantially U shape. Therefore, the rigidity of the core holding rib is increased, the strength of the entire frame can be increased, the central axis can be prevented from shifting or tilting, and a more reliable electric blower or an electric blower that can reduce the weight with the same reliability can be used. realizable.

Further, by separately configuring the frame and the air guide, restrictions on the mold such as the drawing direction are reduced, and the degree of freedom in design is increased. In addition, since the material can be set for each part, by using PP material with good moldability and light specific gravity for the air guide, it is possible to form a lightweight volume tribe and improve the ventilation efficiency. By using a PBT material having high heat resistance and strength for the frame, it is possible to further improve the reliability.

In the second invention, in particular, the core holding rib of the first invention abuts on the outermost peripheral side of the field core on the tooth portion side, similar to the outer peripheral shape of the tooth portion, from the connecting portion on one side. It is formed in a series connected to the connecting portion on the opposite side, and the central portion of the outer peripheral portion on the teeth side is formed in the direction farthest from the axis from the outer peripheral position of the field core, further strengthening the entire frame. It is possible to prevent the deviation and tilt of the central axis from being raised, and to realize efficient cooling and contact prevention of the field winding.

In the third invention, in particular, the flange portion of the first or second invention is formed in a substantially conical shape inclined from the support column portion toward the fan on the outer peripheral side, and is located at a distance from the central axis and is displaced by a load. The strength of the flange with a large displacement can be increased. The area of the return passage formed between the return passage ribs can be smoothly expanded toward the central portion and guided to the central portion, and the ventilation efficiency can be improved. Further, it is possible to shorten the shaft length of the outer peripheral portion of the fan case made of metal, and it is possible to reduce the material cost and the mass.

In the fourth invention, in particular, the flange portion of the third invention has a plurality of bead portions having a concave shape on the fan side and a convex shape on the anti-fan side, and the plurality of concave grooves of the bead portion are all with respect to the shaft. It is located on a plane that is substantially right-angled, and the ends of the ribs of the plurality of return passages of the air guide are also all located on a plane that is substantially perpendicular to the axis and are built in the groove. The end surface of the passage rib can be made flat instead of an inclined surface, which facilitates maintenance of the air guide mold, stabilizes contact with the flange portion of the frame, and further increases the strength of the flange portion.

In addition, since the end side of the return passage rib of the air guide is blocked by the frame, the wind that has passed through the return passage portion formed between the return passage ribs is guided to the outside of the motor portion without leaking, so that the field is efficiently fielded. , The armature and brush unit can be cooled, and a more reliable electric blower can be realized.

The vacuum cleaner according to the fifth invention is equipped with the electric blower according to any one of claims 1 to 4, and can provide a vacuum cleaner with improved reliability.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to this embodiment.

(Embodiment 1)
FIG. 1 is a cross-sectional view of the electric blower according to the first embodiment of the present invention, and FIG. 2 is a rear perspective view of a field core and a frame of the electric blower.

In FIGS. 1 and 2, the electric blower 41 according to the present embodiment is composed of a blower unit 42 and an electric motor unit 43, and the blower unit 42 discharges from a centrifugal fan 2 having a plurality of blades 1 and the fan 2. It is composed of an air guide 22 that rectifies the generated wind, a fan case 3 that covers them and has an intake hole 3a opened in the center, and the like.

The electric machine unit 43 includes an armature 7 rotatably supported by a bearing 6 press-fitted into the rotating shaft 5, a field 8 arranged on the outer periphery of the armature 7, and a field constituting the field 8. Axial direction of a field core 10 constituting the field 8 by incorporating a brush unit 9 or the like for connecting and energizing a winding (not shown) and an armature winding (not shown) constituting the armature 7. The both sides of the frame 4 and the bracket 11 are sandwiched between the frame 4 and the bracket 11, and the circular or semi-circular notch through hole 12 containing the bolt provided in the yoke portion 30 of the field core 10 and the frame 4 and the bracket 11 are described above. The bolt 13 is inserted into the communication hole 23 provided at a position corresponding to the circular or semi-circular notch through hole 12 containing the bolt, and the bolt 13 is tightened and integrally fixed with a nut 14 or the like. ..

As shown in FIG. 2, the frame 4 includes a housing portion 15 that holds a bearing 6 in the center, a substantially disk-shaped base portion 17 that is located under the fan 2 and extends from the housing portion 15 to the outer periphery, and a fan case 3. The outer peripheral cylindrical portion 18 to be press-fitted, the substantially disk-shaped flange portion 24 that comes into contact with the return passage rib 21 of the air guide 22 and extends in the central direction from the outer peripheral cylindrical portion 18, and the base portion 17 and the flange portion 24 are connected in the axial direction. It is composed of a strut portion 25, a bolt fastening portion 19 that protrudes from the base portion 17 toward the field core 10 side and is fixed to the field core 10 by bolts 13, and a core holding rib 20 that similarly holds the field core 10. There is.

The core holding rib 20 in the present embodiment has a yoke portion 30 (see FIG. 4) on the axial end surface of the field core 10 on the side of the axially opposite strut portion 25 of the inner peripheral portion connected to the strut portion 25 of the flange portion 24. ) And the joint portion 32 (see FIG. 4) of the yoke portion 30 and the teeth portion 31 (see FIG. 4). The outer peripheral portion 26 on the yoke side, the yoke portion 30 (see FIG. 4), and the outer peripheral portion 27 on the connecting portion side of the teeth portion 31 (see FIG. 4) are configured in a series, and are configured to come into contact with the axial end surface of the field core 10. It is a thing.

The operation and operation of the electric blower 41 according to the present embodiment configured as described above will be described.

The core holding rib 20 of the frame 4 can support the field core 10 at a short distance from the flange portion 24, and the core holding rib 20 is formed in a substantially U shape, so that the core holding rib 20 is formed. It becomes stronger, can prevent deformation due to external force and vibration, can increase the strength of the entire frame 4 and increase the natural vibration frequency, and can prevent the central axis from shifting or tilting, making it a more reliable electric blower. 41, or an electric blower 41 capable of weight reduction with the same reliability can be realized. Further, since the core holding rib 20 does not block the air passage, the ventilation efficiency does not decrease.

Further, since the air guide 22 and the frame 4 are separate parts, restrictions due to the die cutting direction are reduced, the degree of freedom in design is increased, and the material can be set for each part. Therefore, the air guide 22 has good moldability and a light specific gravity. If a material or the like is used and a PBT material or the like having high heat resistance and strength is used for the frame 4, a lightweight electric blower 41 having higher ventilation efficiency and higher reliability can be realized.

Further, since the return passage portion between the return passage ribs 21 of the air guide 22 is blocked by the flange portion 24 of the frame 4, the exhaust air passes through the motor portion 43 without leakage, and the armature 7, the field 8 and the brush unit Since 9 can be cooled, a more reliable electric blower 41 can be realized.

(Embodiment 2)
FIG. 3 is a rear perspective view of the frame of the electric blower according to the second embodiment of the present invention, and FIG. 4 is a perspective view showing the relationship between the frame and the field core. The same parts as those of the electric blower in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 3, the core holding rib 20 of the frame 4 of the electric blower 41 according to the present embodiment has the axial direction of the field core 10 on the side of the axially counter-strut 25 of the inner peripheral portion connected to the support column 25 of the flange portion 24. It is positioned so as to protrude near the outermost peripheral side of the end face, and is configured in a series from the bolted portion 19 to the outer peripheral portion 26 on the yoke side on both sides, the outer peripheral portion 27 on the connecting portion side of the yoke portion 30 and the teeth portion 31, and the outer peripheral portion 28 on the teeth side. In the outer peripheral portion 28 on the teeth side, the central position 29 is located farthest from the field core 10.

Further explaining the relationship between the frame 4 and the field core 10 with reference to FIG. 4, the shape corresponding to the yoke portion 30, the teeth portion 31, and the connecting portion 32 of the yoke portion 30 and the teeth portion 31 of the field core 10. The outer peripheral portion 26 on the yoke side of the frame 4, the outer peripheral portion 28 on the teeth side, and the outer peripheral portion 27 on the connecting portion side between the yoke portion 30 and the teeth portion 31 are formed, and the central position 29 of the outer peripheral portion 28 on the teeth side is the field core. It is formed at the position farthest from 10.

Since the frame 4 of the electric blower 41 in the present embodiment is configured as described above, the core holding rib 20 has an integral structure connected to the two bolted portions 19, and the flange portion 24 is approximately 90 degrees. Since the structure is folded back and connected, it is possible to further increase the strength of the entire frame 4 and prevent the central axis from shifting or tilting.

Further, since the exhaust air not only flows inside the electric motor unit 43 but also flows inside and outside the field 8, it is possible to efficiently cool the field 8 and realize a more reliable electric blower 41. it can.

(Embodiment 3)
FIG. 5 is a cross-sectional view of the frame of the electric blower according to the third embodiment of the present invention. The same parts as those of the electric blower in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 5, the frame of the electric blower according to the present embodiment is formed by forming a substantially disk-shaped flange portion 24 into a substantially conical shape inclined from the support column portion 25 toward the fan 2 on the outer peripheral side.

Since the frame 4 of the electric blower 41 in the present embodiment is configured as described above, the strength of the flange portion 24, which is a distance from the central axis and has a large displacement due to a load, can be increased, and the strength of the entire frame 4 can be further increased. It is possible to increase the strength and prevent the central axis from shifting or tilting.

Further, the return passage formed by the return passage rib 21 and the flange portion 24 of the air guide 22 can be smoothly expanded in area from the outer circumference to the central portion and guided to the central portion, and the ventilation efficiency is also improved. it can. Further, it is possible to shorten the axial length of the outer peripheral portion of the fan case 3 made of metal, and it is possible to reduce the material cost and the mass.

(Embodiment 4)
FIG. 6 is a cross-sectional perspective view of a main part of the frame of the electric blower according to the fourth embodiment of the present invention, and FIG. 7 is a cross-sectional perspective view of the back surface of the frame. The same parts as those of the electric blower in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIGS. 6 and 7, the frame 4 of the electric blower according to the present embodiment has a bead portion 34 having a concave shape on the fan 2 side and a convex shape on the anti-fan 2 side at a portion where the return passage rib 21 of the flange portion 24 abuts. The return passage ribs 21 are built in the concave grooves 33, all the grooves 33 are positioned on a plane substantially perpendicular to the axis, and all the ends of the return passage ribs 21 are provided. It is formed on a plane substantially perpendicular to the axis.

Since the frame 4 of the electric blower 41 in the present embodiment is configured as described above, the end portion of the return passage rib 21 can be managed in a flat surface, so that mold maintenance is easy and one piece with the flange portion 24. It is possible to prevent deformation and vibration deterioration due to contact. Further, the groove 33 and the convex portion of the bead portion 34 serve as reinforcing ribs, so that the strength of the frame 4 can be further strengthened.

As described above, the electric blower 41 according to the above embodiment can be significantly reduced in weight if it has the same strength as the conventional product, and can be significantly increased in strength and reliable if it has the same mass as the conventional product. It is possible to greatly improve the sex. Further, by mounting the electric blower 41 on an electric vacuum cleaner (not shown), it is possible to provide a small, lightweight and highly reliable electric vacuum cleaner.

As described above, the electric blower according to the present invention can realize weight reduction while maintaining sufficient strength, and can be used not only for electric vacuum cleaners but also for air towels, suction machines, electric tools, etc. that use a blowing action. Applicable.

1 Blade 2 Fan 3 Fan case 3a Intake hole 4 Frame 5 Rotating shaft 6 Bearing 7 Armor 8 Field 9 Brush unit 10 Field core 11 Bracket 12 Circular or semi-circular notch through hole with built-in bolt 13 Bolt 14 Nut 15 Housing part 16 Inclined passage part 17 Base part 18 Outer circumference cylindrical part 19 Bolt fastening part 20 Core holding rib 21 Return passage rib 22 Air guide 23 Communication hole 24 Flange part 25 Strut part 26 York side outer circumference part 27 Connection part side outer circumference Part 28 Teeth side outer circumference 29 Central position 30 York part 31 Teeth part 32 Connecting part 33 Groove 34 Bearing part 41 Electric blower 42 Blower part 43 Electric motor part

Claims (5)

A centrifugal fan with multiple blades, an air guide that rectifies the wind discharged from the fan, a fan case that covers them and has an intake hole in the center, and a fan case that is press-fitted into the rotating shaft and can be rotated by a bearing. an armature supported on a field which is arranged on the outer periphery of the armature, and brush unit that the armature winding is energized connection constituting the armature and field winding constituting said magnetic field, A circular shape containing a frame having a housing portion for holding the bearing, a field core constituting the field core , a bracket for sandwiching the field core between the frame, and bolts provided in the field core. Alternatively, in an electric blower composed of an electric motor unit in which the field core, the frame, and the bracket are integrally fixed by tightening with bolts and nuts through a semicircular notch through hole, the frame is located at the center. The housing portion that holds the bearing, the disk-shaped base portion that is located under the fan and extends from the housing portion to the outer peripheral portion, the outer peripheral cylindrical portion into which the fan case is press-fitted, and the field core are fixed. It is composed of a bolted portion to be bolted, a flange portion that comes into contact with the return passage rib of the air guide and extends to the outer peripheral cylindrical portion, and a strut portion that connects the base portion and the flange portion. A core holding rib projecting toward the end face in the rotation axis direction of the magnetic core is provided, and the core holding rib has a shape on the outer peripheral side of the yoke portion of the end face in the rotation axis direction of the field core and the connecting portion between the yoke portion and the teeth portion. An electric blower characterized in that it is formed at a position where it abuts on the outermost peripheral side and is configured in a series on both sides from the bolted portion. The core holding rib is extended to the teeth side of the field core, along the teeth from one end of the connecting portion, while being formed in a series which led to the connecting portion on the opposite side of the core electric blower according to claim 1 the central portion of the tooth side outer peripheral portion of the retaining rib, characterized in that it is formed in a direction away from the most the rotary axis than the outer peripheral position of the field magnet core. The flange portion is an electric blower according to claim 1 or 2, characterized in that it is formed in a substantially conical inclined to the fan direction of the outer peripheral side from the strut. The flange portion has a plurality of bead portions having a concave shape on the fan side and a convex shape on the anti-fan side, and the plurality of concave grooves of the bead portion are all located on a plane substantially perpendicular to the rotation axis. The third aspect of claim 3, wherein all the ends of the plurality of return passage ribs of the air guide are similarly located on a plane substantially perpendicular to the rotation axis and are incorporated in the concave groove. Electric blower. An electric vacuum cleaner equipped with the electric blower according to any one of claims 1 to 4.

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