JP2011064072A - Fan, electric blower with the same, and vacuum cleaner using the electric blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an efficient and low-cost fan by reducing a blowing loss in an inner air passage of the fan, to provide an electric blower with the fan, and to provide a vacuum cleaner using the electric blower. <P>SOLUTION: This fan includes: a doughnut-shaped front plate 10 having an intake port 9 for sucking air at a central part thereof; a disc-like rear plate 11 facing the surface of the front plate 10; and blades 12 partitioning a space between the front plate 10 and the rear plate 11 with a predetermined interval in the circumferential direction to form an inner air passage extending in the radial direction. This fan discharges air sucked by rotation of the blades 12 from the intake port 9 discharges from an outer diameter side of the inner air passage by making the air flow from an inner diameter side to the outer diameter side of the inner air passage. The blade 12 is formed of a thin piece obtained by scraping the surface of the rear plate 11, and the thin piece is raised in the surface of the rear plate 11 to have a standing part 12a, and the inner air passage is formed by the standing part of the rear plate 11 and the front plate 10, surrounding the same. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fan, an electric blower including the fan, and an electric vacuum cleaner using the electric blower.

  A fan of a conventional electric blower extends in the radial direction, with a front plate made of a donut-shaped plate having an air inlet on the center side, a rear plate made of a circular plate spaced from the front plate, and The space between the front plate and the rear plate is partitioned at a predetermined interval in the circumferential direction, and has a blade composed of a plurality of plates that form an internal air passage extending in the radial direction. It circulates from the inner diameter side of the internal air passage to the outer diameter side and is discharged. The front plate and the blade or the rear plate and the blade are integrally fixed by caulking. In order to improve the air blowing efficiency, a fan is shown in which the gap between the joints is reduced by sandwiching and fixing the sheet between the front plate or the rear plate and the blade (see, for example, Patent Document 1). ).

  In addition, in the fan of another conventional electric blower, in order to improve the blowing efficiency, a curved part is sandwiched and configured along the joint between the front plate and the blade to reduce the blowing loss in the internal air passage. This fan is shown (for example, see Patent Document 2).

JP 2007-146812 A (page 4-5, FIGS. 1 and 2) JP 2008-121650 A (page 5, FIGS. 1 and 2)

  In such a conventional electric blower fan, the gap between the joints can be reduced by sandwiching the sheet at the junction between the front plate or the rear plate and the blade, but the internal air path of the fan is narrowed by the sandwiched sheet. And there is a problem that the weight of the fan increases.

  Furthermore, there has been a problem in that an imbalance of the fan occurs due to a sheet positioning error.

  In another fan, a curved portion is formed in the internal air passage of the fan, so that the air loss in the internal air passage of the fan can be reduced. However, since a separate part is used for the curved portion, the internal air passage of the fan is Since it is narrow because of the curved portion and the weight of the fan increases, there are problems that the blowing efficiency is reduced and the cost is increased.

  The present invention has been made to solve the above-described problems, and does not increase the number of parts or reduce the internal air passage of the fan, and the gap between the front plate or the joint between the rear plate and the blade. The purpose of the present invention is to obtain a highly efficient and low-cost fan, an electric blower equipped with the fan, and a vacuum cleaner using the electric blower by reducing airflow loss in the internal air passage of the fan.

The fan according to the present invention includes a donut-shaped front plate having an air inlet for sucking outside air in the center, a rear plate that has a disk shape and faces the surface of the front plate, the front plate, and the front plate. A blade that forms an internal air passage extending in a radial direction by partitioning a space between the rear plate at a predetermined interval in the circumferential direction, and the outside air sucked from the intake port by the rotation of the blade In the fan that circulates from the inner diameter side of the internal air passage to the outer diameter side and discharges from the outer diameter side,
The blade is composed of a thin-walled piece obtained by scraping the surface of one or both of the front plate and the rear plate, and has an upright portion that stands the thin-walled piece on the surface,
The internal air passage is formed to be surrounded by the rear plate, the upright portion, and the front plate.

  The electric blower according to the present invention includes a field portion fixed in the frame, a rotating shaft supported so as to be rotatable on the frame, and coaxial with the field portion around the rotating shaft. And a fan according to the present invention provided at one end of the rotating shaft.

  The vacuum cleaner according to the present invention includes a suction port for sucking outside air, a dust collecting chamber for collecting dust in the sucked outside air, a discharge port for discharging the sucked outside air, and the suction port in the vacuum cleaner body. An electric blower that sucks outside air from the mouth, generates an air flow, and discharges the outside air from the discharge port, and uses the electric blower according to the present invention as the electric blower.

According to the fan of the present invention, a donut-shaped front plate having a suction port for sucking outside air in the center, a disc-like rear plate whose surface faces the surface of the front plate, and the front plate A blade that forms an internal air passage extending in a radial direction by partitioning a space between the rear plate at a predetermined interval in the circumferential direction, and is sucked from the intake port by rotation of the blade In a fan that allows outside air to flow from the inner diameter side of the internal air passage to the outer diameter side and to be discharged from the outer diameter side,
The blade is composed of a thin-walled piece obtained by scraping the surface of one or both of the front plate and the rear plate, and has an upright portion that stands the thin-walled piece on the surface,
Since the internal air passage is formed by being surrounded by the rear plate, the upright portion, and the front plate, there is no gap between the thin piece of the blade and the surface on which the thin piece is raised. Therefore, there is no air flow leaking out, and the blowing efficiency as a fan is improved.

  Further, since the blade is formed by cutting both the front plate and the rear plate or one of the surfaces, the number of parts can be greatly reduced and the number of assembly steps can be reduced.

  Further, since the blade is connected to both or one of the front plate and the rear plate over almost the entire region extending in the radial direction, a high-strength fan that can withstand centrifugal force due to high-speed rotation can be obtained.

  According to the electric blower of the present invention, the field portion fixed in the frame, the rotating shaft supported so as to be able to rotate on the frame, and the field portion fixed to the rotating shaft and centering on the rotating shaft. And an armature portion that rotates coaxially, and the fan according to the present invention is provided at one end of the rotating shaft, so that an inexpensive electric blower with good blowing efficiency can be obtained.

  According to the electric vacuum cleaner according to the present invention, in the vacuum cleaner main body, the suction port for sucking outside air, the dust collecting chamber for collecting the dust in the sucked outside air, the discharge port for discharging the sucked outside air, An electric blower that sucks outside air from the suction port, generates an air flow, and discharges the outside air from the discharge port, and uses the electric blower according to the present invention as the electric blower. And cheap vacuum cleaner.

It is sectional drawing which shows the vacuum cleaner provided with the electric blower in Embodiment 1. FIG. It is a longitudinal cross-sectional view which shows the electric blower of FIG. It is sectional drawing of the fan in FIG. It is AA sectional drawing of the fan in FIG. It is BB sectional drawing of the fan in FIG. FIG. 3 is a perspective view showing a cutting blade for manufacturing the blade in the first embodiment. FIG. 3 is a cross-sectional view illustrating a method for manufacturing the blade in the first embodiment. FIG. 3 is a cross-sectional view illustrating the structure of the fan in the first embodiment. FIG. 3 is a cross-sectional view showing a plurality of shape examples of the fan in the first embodiment. FIG. 6 is a cross-sectional view showing another example of a fan in the first embodiment. It is sectional drawing which shows the fan of the electric blower in Embodiment 2. FIG. 6 is a perspective view showing a blade of a fan in a third embodiment. It is sectional drawing which shows the fan of the electric blower in Embodiment 4.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing a vacuum cleaner provided with the electric blower according to the first embodiment. As shown in FIG. 1, the vacuum cleaner includes a suction port 1a for sucking outside air into the cleaner body 1, a dust collection chamber 3 for collecting dust in the sucked outside air, a discharge port 1b for discharging the sucked outside air, The electric blower 2 generates an air flow that sucks outside air from the suction port 1a and discharges it from the discharge port 1b. The air sucked in the direction indicated by the arrow from the suction port 1a is collected in the dust collection chamber 3, the electric blower 2, The air is exhausted out of the cleaner body 1 through the discharge port 1b.

  FIG. 2 is a longitudinal sectional view showing the electric blower. As shown in FIG. 2, the electric blower 2 according to the first embodiment is supported by the field portion 5 fixed in the frame 4, and coaxially arranged with the field portion 5 so as to be rotatable on the frame 4. A rotating shaft 7, an armature portion 6 fixed to the rotating shaft 7 and rotating coaxially with the field magnet portion 5, a fan 8 fixed to one end of the rotating shaft 7 and rotating together with the armature portion 6, and a commutator. 30. In FIG. 2, the left part of the armature unit 6 and the commutator 30 to the left of the center of the rotating shaft 7 shows a state where the slot can be seen.

  3 is a cross-sectional view of the fan in FIG. 2, FIG. 4 is a cross-sectional view of the fan in AA in FIG. 3, and FIG. 5 is a cross-sectional view of the fan in FIG. 3 to 5, the fan 8 is a doughnut-shaped plate-like front plate 10 having an air inlet 9 for sucking outside air in the center, and the front plate 10 is spaced from the front plate 10, and the surface thereof is the front plate 10. A circular plate-like rear plate 11 facing the surface of the plate and a space between the front plate 10 and the rear plate 11 are partitioned at a predetermined interval in the circumferential direction to form an internal air passage 14 extending in the radial direction. A plurality of blades 12 are provided, and external air is sucked from the intake port 9 by the rotation of the blades 12, flows from the inner diameter side to the outer diameter side of the internal air passage 14, and is discharged from the outer diameter side.

FIG. 6 is a perspective view showing a cutting blade for manufacturing the blade in the first embodiment, and FIG. 7 is a sectional view for explaining a method for manufacturing the blade in the first embodiment.
As shown in FIGS. 6 and 7, the blade 12 forms a thin piece by shaving the surface of the metal plate 25 to be the rear plate 11 with a cutting blade 26 having a curved surface 24, and forming the thin piece. By forming the upright portion 12 a bent from the base end portion 27 and standing on the surface of the metal plate 25, an internal air passage surrounded by the rear plate 11, the upright portion 12 a, and the front plate 10 is formed. The thin piece is erected using a molding block 28 and molded into a predetermined angle and a predetermined shape by the molding block 28.

  In the electric blower 2 having the fan 8 configured as described above, when the fan 8 rotates in the rotation direction indicated by the arrow in FIG. 5, the air sucked from the intake port 9 becomes the air flow 13 and becomes the front plate. 10. It passes through an inner air passage 14 surrounded by the rear plate 11 and the blade 12 and extending in the radial direction, and is discharged from an exhaust port 15 on the outer diameter side of the inner air passage 14.

  According to the fan 8 of the first embodiment, as shown in FIG. 4A, the blade 12 is erected from the surface of the rear plate 11, and a joining portion such as caulking is provided between the rear plate 11 and the blade 12. Therefore, it is possible to obtain the fan 8 having high blowing efficiency without leakage of the air flow 13 at the joint portion, and the number of parts can be reduced, so that the number of assembling steps can be reduced.

  Further, as shown in FIG. 8, the blade 12 erected from the surface of the rear plate 11 is applied to the rear plate 11 over almost the entire area from the intake side end portion 16 on the inner diameter side to the exhaust side end portion 17 on the outer diameter side. Since the structure is connected and the centrifugal force due to the high-speed rotation does not concentrate on a part of the blade 12, a high-strength fan 8 can be obtained. In FIG. 8, the front plate 10 is omitted.

  In FIG. 4 (a), the plurality of blades 12 are cut and raised from the rear plate 11. However, as shown in FIG. 4 (b), the same effect can be obtained by cutting and cutting the plurality of blades 12 from the front plate 10. Is obtained.

  Next, the air flow 13 flowing through the internal air passage 14 of the fan 8 will be described with reference to FIGS. The air flow 13 flowing through the internal air passage 14 of the fan 8 flows from the intake port 9 to the exhaust port 15 at the outer peripheral portion of the fan 8, the high-speed rotation of the fan 8, and the internal air passage 14 being curved. It becomes a combined flow with the circulating flow 18. Therefore, the air flow 13 is discharged from the exhaust port 15 in the outer peripheral portion of the fan 8 in a substantially spiral flow through the internal air passage 14 of the fan 8. In addition, the air flow 13 receives centrifugal force due to the high-speed rotation of the fan 8, but since it is rotating, the air flow 13 flows largely on the front side surface of the blade 12.

  In the configuration of the first embodiment, by providing a blade bending portion 19 that curves in a concave shape along the standing direction on the surface on the front side of the rotation of the blade 12 rising from the front plate 10 or the rear plate 11, Since the air flow 13 flows smoothly along the blade bending portion 19, the blowing efficiency of the electric blower 2 is improved. Further, by providing the corner curved portion 20 that curves in a concave shape at the base of the front side surface of the blade 12 that stands up, the air flow 13 flows smoothly along the corner curved portion 20. It can be further improved.

  FIG. 9 is a cross-sectional view showing a plurality of shape examples of the fan 8 in the first embodiment (the front plate 10 is omitted in FIG. 9).

  The linear type shown in FIG. 9A is obtained by vertically raising the integrally formed blade 12 and providing a corner curved portion 20 at the base end that is the base of the surface on the front side of the rotation of the standing blade 12. . Since the circulating flow 18 flows smoothly along the curved surface of the corner bending portion 20, the blowing efficiency of the electric blower 2 is improved.

  The bending type in FIG. 9B is obtained by providing a corner bending portion 20 at the base end portion of the integrally formed blade 12 and a blade bending portion 19 at the blade 12. Since the blade bending portion 19 is provided in the blade 12 in addition to the corner bending portion 20 at the base end portion, the blowing efficiency of the electric blower 2 is further improved.

  The inclined mold in FIG. 9C is obtained by tilting the standing angle of the integrally formed blade 12 from the vertical. Depending on the shape of the fan 8 and the number of rotations used, the optimum rising angle of the blade is different, and the blade is inclined at the optimum angle, so that the blowing efficiency of the electric blower 2 is improved.

  The curved inclined type in FIG. 9D is provided with a shape combining (b) curved type and (c) inclined type. Since (b) the curved type and (c) the inclined type are combined, the blowing efficiency of the electric blower 2 is further improved.

  The L-shape of FIG. 9E is obtained by providing the upper curved portion 22 with the blade 12 not only at the base end portion of the integrally formed blade 12 but also at the corner of the upper internal air passage 14. Since the circulating flow 18 flows smoothly along the upper curved portion, the blowing efficiency of the electric blower 2 is improved.

  In the folding mold of FIG. 9 (f), the blade 12 is provided with a folding portion 23 on the upper side. By providing the folded curved portion 23, the folded flow of the circulating flow 18 flows smoothly along the folded curved portion 23, so that the blowing efficiency of the electric blower 2 is improved.

  Even when a curved portion is provided on the surface on the rear side of the rotation of the integrally formed blade 12 as in the reverse curved type of FIG. Depending on the shape of the fan 8 and the number of rotations used, the blowing efficiency of the electric blower 2 is improved by providing a curved portion on the rotating rear surface.

  In the corrugation of FIG. 9 (h), as shown in the figure, since the curved portions are provided on both the front surface of the rotation and the rear surface of the rotation, the circulating flow 18 flows smoothly and the electric blower 2 The ventilation efficiency is improved.

  FIG. 10 is a cross-sectional view showing another example of the fan according to the first embodiment. As shown in FIG. 10, a structure in which a caulking protrusion 24 is simultaneously formed on a plurality of blades 12 integrally formed from the rear plate 11, and the front plate 10 and the blade 12 are fixed by caulking using the caulking protrusion 24. It is good. Since the caulking conventionally used can be utilized, the front plate 10 can be accurately positioned and fixed.

Embodiment 2. FIG.
11 (a) and 11 (b) are cross-sectional views showing the fan of the electric blower in the second embodiment. In the second embodiment, as shown in FIG. 11, a substantially square internal air passage 14 is formed by a blade 12 formed by cutting the rear plate 11 into a thin wall. In FIG. 11A, a front plate 10 is formed by forming a bent portion 12b that is bent from the tip of an upright portion 12a of the upstanding blade 12, and the bent portion 12b is continuous over the entire circumference. An internal air passage 14 surrounded by an upright portion 12a formed from the blade 12 and a bent portion 12b is formed, and in FIG. 11B, the blade 12 is bent into a U-shape to form a single blade 12. An internal air passage 14 is formed.

  According to the second embodiment, since the front plate 10 can be formed by the bent portion 11a of the blade 12 formed by thinly cutting the rear plate 11, the material can be saved and the number of assembly steps can be reduced. .

Embodiment 3 FIG.
FIG. 12 is a perspective view showing a blade of the fan in the third embodiment. In the third embodiment, as shown in FIG. 12, the intake side end portion 16 on the inner diameter side of the blade 12 that is integrally formed by cutting from the front plate 10 or the rear plate 11 is formed thinner than the other portions. Yes.

  According to the third embodiment, since the intake side end portion 16 is made thinner than the other portions, it is possible to reduce the air loss caused by the air flow colliding with the intake side end portion 16 of the blade 12.

Embodiment 4 FIG.
FIG. 13: is sectional drawing which shows the fan of the electric blower in this Embodiment 4. In FIG. In the fourth embodiment, as shown in FIG. 13, both the front plate 10 and the rear plate 11 are provided with blades 12 formed by cutting the surface into thin pieces, and the front plate 10 and the rear plate 11 are combined, An internal air passage 14 is formed by the blade formed on the plate 10 and the blade formed on the rear plate 11.

  According to the fourth embodiment, it is possible to eliminate the gap at both the joint portion between the front plate 10 and the blade 12 and the joint portion between the rear plate 11 and the blade 12 and improve the blowing efficiency of the electric blower. Further, since the number of blades 12 can be increased, the blowing efficiency is further improved.

  The fan and the electric blower according to the present invention can be effectively used for a vacuum cleaner or the like.

1 vacuum cleaner body, 1a inlet, 1b outlet, 2 electric blower, 3 dust collector,
4 frame, 5 field part, 6 armature part, 7 rotating shaft, 8 fan, 9 air inlet,
10 Front plate, 11 Rear plate, 12 Blade, 12a Standing part,
12b bent portion, 13 air flow, 14 internal air passage, 15 exhaust port,
16 Inlet side end, 17 Exhaust side end, 18 Circulating flow, 19 Blade curved part,
20 corner bends, 21 crimping projections, 22 upper bends, 23 turn bends,
24 curved surface, 25 metal plate, 26 sharpening blade, 27 base end,
28 molding blocks, 30 commutators.

Claims (9)

A donut-shaped front plate having a suction port for sucking outside air in the center, a disc-shaped rear plate whose surface faces the surface of the front plate, and a space between the front plate and the rear plate And a blade that forms an internal air passage extending in the radial direction by partitioning the air at a predetermined interval in the circumferential direction, and the rotation of the blade causes the outside air to be sucked from the intake port to the inside diameter of the internal air passage In the fan that circulates from the side to the outer diameter side and discharges from the outer diameter side
The blade is composed of a thin-walled piece obtained by scraping the surface of one or both of the front plate and the rear plate, and has an upright portion that stands the thin-walled piece on the surface,
The fan, wherein the internal air passage is formed by being surrounded by the rear plate, the upright portion, and the front plate. The fan according to claim 1, wherein a blade bending portion that is curved in a concave shape along the rising direction is provided on a surface of the blade on the front side where the rising portion rotates. The fan according to claim 1 or 2, wherein a corner-curved portion that is curved in a concave shape along the rising direction is provided at the base of the surface of the blade on the front side where the rising portion rotates. . 4. The caulking protrusion for fixing the blade to the front or rear plate by caulking is provided at the tip of the standing portion of the blade. 5. fan. The blade has a bent portion in which the thin piece is formed by scraping the surface of the rear plate, and is bent from the tip of the upright portion, and the bent portion is connected over the entire circumference to form the front plate. The fan according to any one of claims 1 to 4, wherein the internal air passage is formed. The fan according to any one of claims 1 to 5, wherein an end portion on a radially inner side of the blade forming the internal air passage is thinner than another portion of the blade. Both the front plate and the rear plate are provided with the blade made of a thin piece with the surface cut, and the internal air passage is formed by the blade formed from the front plate and the blade formed from the rear plate. The fan according to any one of claims 1 to 6, characterized in that: A field portion fixed in the frame, a rotating shaft supported so as to be rotatable on the frame, and an armature portion fixed to the rotating shaft and rotating coaxially with the field portion around the rotating shaft. An electric blower comprising the fan according to any one of claims 1 to 7 at one end of the rotating shaft. Inside the vacuum cleaner body, an intake port for sucking outside air, a dust collection chamber for collecting dust in the sucked outside air, a discharge port for discharging the sucked outside air, and a suction port for sucking outside air from the suction port. And an electric blower that discharges outside air from the discharge port, and the electric blower according to claim 8 is used as the electric blower.

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