JP2008121650A - Electric blower and electric vacuum cleaner using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric blower for facilitating assembling, while improving air blowing efficiency, by restraining a vortex flow in a flow passage in an impeller. <P>SOLUTION: A curved part 16 (that is, a fillet part) is arranged along a joining part in the joining part of at least a front shroud 4 constituting the impeller 2 and a blade 6, and the curved part 16 is sandwiched between the front shroud 4 and the blade 6. Thus, thee air blowing efficiency can be improved by restraining the vortex flow in the flow passage in the impeller 2 by the curved part 16. When assembling the impeller, the curved part 16 is also simultaneously sandwiched and assembled, and the assembling can also be facilitated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric blower with improved blowing efficiency and a vacuum cleaner using the same.

  Conventionally, an impeller of an electric blower has a front shroud having an air inlet, a rear shroud spaced apart from the front shroud, and a plurality of blades sandwiched by the front shroud and the rear shroud. The rear shroud and the blade are fixed together by caulking.

And in order to improve ventilation efficiency, the electric blower (for example, refer patent document 1) which made the clearance gap between the casing and impeller inlet part which covers an impeller, and the clearance gap between a front shroud and a blade small, an inducer, etc. In an impeller with a built-in electric blower, a thin rib is provided at the tip of a portion that is in close contact with the front shroud of the inducer guide blade and pressed to reduce the gap between the inducer guide blade and the front shroud (for example, Patent Literature 2) is known.
JP-A-8-296589 JP 2000-179491 A

  However, the above-described conventional configurations are merely countermeasures for gaps, and do not improve the blowing efficiency by suppressing vortex flow in the flow path in the impeller. That is, the cross-sectional shape of the flow path in the impeller is surrounded by a front shroud, a rear shroud, and a blade between both shrouds, and has a substantially rectangular shape. For this reason, the airflow flowing through the flow path in the impeller by the rotation of the impeller becomes a primary flow in the outer peripheral direction flowing between the blades and a secondary flow in the vertical direction perpendicular thereto, and these primary and secondary flows. Is disturbed, and small vortexes are generated at the four corners of the substantially rectangular channel, thereby lowering the blowing efficiency.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problem, and suppresses vortex flow in a flow path in an impeller to improve air blowing efficiency and facilitates assembly, and an electric vacuum cleaner using the same The purpose is to provide.

  In order to solve the above-described conventional problems, the electric blower of the present invention is provided with a curved portion (that is, a fillet portion) along the joint portion at least at the joint portion between the front shroud and the blade constituting the impeller. Is an electric blower configured to be sandwiched between the front shroud and the blade.

  As a result, the vortex flow in the flow path in the impeller can be suppressed by the curved portion, so that the air blowing efficiency can be improved, and the curved portion is also sandwiched and assembled at the same time when the impeller is assembled. Can also be achieved.

  Moreover, the vacuum cleaner using this electric blower has high suction performance and can perform comfortable cleaning.

  The electric blower of the present invention and the electric vacuum cleaner using the electric blower can improve the blowing efficiency and facilitate the assembly.

  According to a first aspect of the present invention, an impeller that is rotationally driven by an electric motor includes a front shroud having an air inlet, a rear shroud that is spaced from the front shroud, and a plurality of impellers that are sandwiched between the front shroud and the rear shroud. The front shroud, the rear shroud, and the blade are integrally fixed, and at least a joint portion between the front shroud and the blade is provided with a curved portion along the joint portion. Is an electric blower configured to be sandwiched between the front shroud and the blade. As a result, the vortex flow in the flow path in the impeller can be suppressed by the curved portion, so that the air blowing efficiency can be improved, and the curved portion is also sandwiched and assembled at the same time when the impeller is assembled. Can also be achieved.

  In particular, according to the second invention, in the first invention, an inducer having a chevron-shaped hub and a plurality of guide vanes formed substantially radially from the hub and connected to the blades in the vicinity of the air inlet of the front shroud. And the curved portion is provided along at least one of the joint portions of the front shroud, the blade, and the guide blade, so that the curved portion is formed in a part of the flow path in the impeller including the guide blade of the inducer. Thus, vortex flow in the flow path in the impeller can be suppressed, and at the same time, assembly can be facilitated.

  According to a third aspect of the invention, in particular, in the first or second aspect of the invention, the plurality of bending portions are connected and integrated into an annular shape so that the individual bending portions are not dispersed. Assembly can be performed easily.

  In the fourth aspect of the invention, in particular, in any one of the first to third aspects of the invention, since the bending portion is configured to be fastened together with the projection caulking portion of the blade, the bending portion can be easily and firmly accurate. Can be fixed in position.

  According to a fifth aspect of the invention, in particular, in any one of the first to fourth aspects of the invention, the curved portion is attached to the front shroud and then sandwiched between the front shroud and the blade. It can be performed in the same manner as in the assembly process, and further, the gap between the front shroud and the curved portion can be reduced, and air can be prevented from leaking between the two and lowering the blowing efficiency.

  In a sixth aspect of the invention, in particular, in any one of the first to fifth aspects of the invention, the curved portion is provided with a blade collapse support portion at the rear of the impeller in the rotational direction, whereby the blade or / and the guide blade of the inducer are provided. In particular, it is possible to prevent the blade or / and the vicinity of the inlet tip of the guide blade of the inducer from falling down and deforming due to the centrifugal force generated by the high-speed rotation supported by the blade-falling support portion.

  According to a seventh aspect of the invention, in particular, in any one of the first to sixth aspects of the invention, a part of the curved portion can be deformed and is deformed when sandwiched between the front shroud and the blade, so that at least the blade and the front shroud are formed. Since the curved portion and the blade or / and the front shroud are in pressure contact with each other, the air blowing efficiency is prevented from being lowered due to air leaking, and the curved portion and the blade or / and the front shroud are It is also possible to prevent the air blowing efficiency from being lowered by the air entering the gap and disturbing the flow.

  In an eighth aspect of the invention, in particular, in any one of the first to seventh aspects of the invention, the curved portion is provided over substantially the entire area of the outer periphery of the impeller from the inlet of the impeller. The efficiency can be increased, and the number of portions for fixing the bending portion is increased, so that the bending portion can be more firmly fixed.

  In a ninth aspect of the invention, in particular, in any one of the first to seventh aspects, by providing a fitting portion for fitting the curved portion to the front shroud, and eliminating the step at the boundary portion between the curved portion and the front shroud, It is easy to increase the cross-sectional area of the impeller without causing a step at the boundary between the curved portion and the front shroud.

  In the tenth aspect of the invention, in particular, the vacuum cleaner having the electric blower of any one of the first to ninth aspects has high suction performance and can be cleaned comfortably.

  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)
1 and 2 show an electric blower according to Embodiment 1 of the present invention.

  As shown in the figure, the electric blower in the present embodiment includes an electric motor 1 and an impeller 4 that is connected to the electric motor 1 and is driven to rotate. The impeller 4 includes a front shroud 4 having an intake port 3, and a front shroud. 4, a rear shroud 5 that is spaced apart from the front shroud 4, and a plurality of blades 6 sandwiched between the front shroud 4 and the rear shroud 5. The front shroud 4, the rear shroud 5, and the blade 6 are integrated by caulking. It is fixed to. Further, at least a joint portion between the front shroud 4 and the blade 6 is provided with a curved portion (fillet portion) 16 that is continuously curved along the joint portion, and the curved portion 16 is sandwiched between the front shroud 4 and the blade 6. It is set as the structure which carries out.

  The front shroud 4, the rear shroud 5, and the blade 6 are made of sheet metal in the present embodiment. In this case, the three members are fastened together by the projection caulking portion 11 of the blade 6. The members constituting the impeller 4 are not limited to sheet metal.

  Further, as is generally well known, the electric blower has an air guide 7 provided with guide vanes on the outer periphery of the impeller 4, and the impeller 4 and the air guide 7 are covered with a casing 8. It is.

  About the electric blower comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  The impeller 2 connected to the electric motor 1 rotates at a high speed and sucks air from the intake port 3 of the impeller 2, and this air flow passes through an internal flow path surrounded by the front shroud 4, the rear shroud 5, and the two blades 6. It passes through and is discharged from the outer periphery of the impeller 2.

  At this time, in addition to the main flow (primary flow: v1 in FIG. 1) that travels through the internal flow path from the air inlet 3 to the outer periphery of the impeller 2, the air flow is rotated, and the internal flow path is bent. The secondary flow (secondary flow: v2 in FIG. 2) in the vertical direction is generated in the main flow due to the presence of the Coriolis force and the gap leakage. The secondary flow v2 is a flow that circulates in a substantially annular shape mainly in the cross section of the flow path, and is combined with the primary flow v1, so that the air flow sucked from the intake port 3 draws a substantially spiral and impeller 2 It will be discharged to the outer periphery.

  Therefore, since the curved portion 16 is provided along the joint portion between the front shroud 4 and the blade 6, the secondary flow v <b> 2 flows smoothly along the curved portion 16. For this reason, there is no disturbance of the secondary flow v2 in the curved part 16 of a flow path, and the vortex | eddy_current v3 is suppressed. The curved portion 16 is fastened together with the front shroud 4 at the projection caulking portion 11 of the blade 6 as in the conventional assembly method. In addition, the curved part 16 can also be provided in the four corners of a flow path.

  As described above, in the present embodiment, at least a joint portion between the front shroud 4 and the blade 6 constituting the impeller 2 is provided with a curved portion (that is, a fillet portion) 16 along the joint portion. By adopting a configuration in which the front shroud 4 and the blade 6 are sandwiched, curved portions 16 are formed at the corners of the flow path in the impeller 2, and the disturbance of the secondary flow at the corners is suppressed. In addition to being able to improve, since the curved portion 16 is also sandwiched and assembled at the time of assembling the impeller 2, the assembly can be facilitated while maintaining the strength.

  Further, by adopting a configuration in which the bending portion 16 is fastened together with the projection caulking portion 11 of the blade 6, the bending portion 16 can be fixed at a strong and accurate position while being simple.

(Embodiment 2)
FIG. 3 shows an impeller of the electric blower according to Embodiment 2 of the present invention. The same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in the figure, in the present embodiment, a plurality of curved portions 16 are formed into an annular curved portion 18 integrally connected in an annular shape, and the annular curved portion 18 is at least the front shroud 4 constituting the impeller 2. And the blade 6 are sandwiched along the joint. That is, the annular curved portion 18 is clamped along the joint portion between the front shroud 4 and the blade 6 by caulking the projection caulking portion 11 through the attachment holes 11 a and 11 b.

  As described above, in the present embodiment, by forming the annular curved portion 18, the individual curved portions 16 can be easily assembled without being dispersed (assembled in the direction of the arrow in the figure). .

(Embodiment 3)
FIG. 4 shows an impeller of the electric blower according to Embodiment 3 of the present invention. The same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in the figure, in the present embodiment, the curved portion 16 (annular curved portion 18 in the figure) is integrally attached to the front shroud 4 with a pin portion 11c prior to assembly, and then the front shroud 4 and blade 6 is configured to be sandwiched between the two. At this time, the bending portion 16 may be attached to the front shroud 4 with a fastening force of the order of temporary fixing, and is finally firmly fixed after assembly. When attaching the attachment pin portion 11c to the front shroud 4, a sufficient effect can be obtained even with light press-fitting.

  Thus, in the present embodiment, by attaching the bending portion 16 to the front shroud 4, it is possible to perform the same as the assembly process of the conventional impeller 2, and furthermore, the front shroud 4 and the bending portion 16. The gap between the two can be reduced, and air can be prevented from leaking between the two to reduce the air blowing efficiency.

(Embodiment 4)
FIG. 5 shows an impeller of an electric blower according to Embodiment 4 of the present invention. The same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in the figure, in the present embodiment, the bending portion 16 is provided with a blade-falling support portion 20 with respect to the direction of arrow F behind the direction of rotation (arrow E) in which the centrifugal force due to the high speed rotation of the impeller 2 is applied to the blade 6. It is a thing.

  As described above, in the present embodiment, the blade 6 is supported by the blade-falling support portion 20 by providing the blade-falling support portion 20, and in particular, the centrifugal force generated from the high-speed rotation causes the blade 6 to It is possible to prevent the vicinity of the inlet tip from falling and deforming.

  In addition, while the impeller 2 is rotating, the blade 6 is brought into close contact with the blade collapse support portion 20 by centrifugal force during the rotation of the blade collapse support portion 20, so that it is possible to prevent a reduction in blowing efficiency due to air leakage between the blades 6.

(Embodiment 5)
FIG. 6 shows an impeller of an electric blower according to Embodiment 5 of the present invention. The same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in the figure, in the present embodiment, a part of the bending portion 16 can be deformed and deformed when sandwiched between the front shroud 4 and the blade 6, and at least one of the blade 6 and the front shroud 4 is deformed. The structure is in close contact. Specifically, the curved end portion 16a of the curved portion 16 on the blade 6 side can be deformed, and the curved portion 16 is deformed by matching the curved end portion 16a when the blade 6 is clamped, so that at least the blade 6 and the front shroud 4 are deformed. There is provided a deforming action portion 6a that is in close contact with any one of the above.

  As described above, in the present embodiment, since the curved portion 16 can be partially deformed, the curved end portion 16a can be used as the blade 6 and / or the front shroud when sandwiched between the front shroud 4 and the blade 6. 4, the air blowing efficiency is prevented from being lowered due to air leaking through the gap, and the air flows into the gap between the curved portion 16 and the blade 6 or / and the front shroud 4 to disturb the flow. Can also be prevented.

  Furthermore, the degree of instability at the time of assembling the bending portion 16 can be suppressed and the bending portion 16 can be fixed more firmly.

(Embodiment 6)
FIG. 7 shows an impeller of an electric blower in Embodiment 6 of the present invention. The same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 7A, in the present embodiment, the bending portion 16 is arranged over almost the entire area of the outer periphery of the impeller 2 from the air inlet 3.

  As a result, the air blowing efficiency can be increased throughout the flow path, and the number of the projection caulking portions 11 for fixing the curved portion 16 is increased, so that the air can be more firmly fixed.

  In addition, by arranging the curved portion 16 in a concentrated manner on the outer peripheral portion of the impeller 2 except for the vicinity of the intake port 3, the curved portion 16 can be configured with respect to the air flow having an increased flow velocity, and the blowing efficiency can be improved. Further, in the blade 6, the outer peripheral side from the outermost peripheral portion of the projection caulking portion 11 is pressed by the curved portion 16, and the blade 6 does not jump out of the front shroud 4 by suppressing deformation due to centrifugal force.

  Further, the curved portion 16 is concentrated and arranged only in the vicinity of the intake port 3 and substantially the central portion excluding the outer peripheral portion of the impeller 2, and at least at the blade 6, the curved portion 16 is curved at the innermost peripheral portion and the outermost peripheral portion. By not pinching with the part 16, the blade 6 can be firmly fixed to the front shroud 4.

  In addition, by arranging the curved portion 16 from the inside of the intake port 3 of the front shroud 4, it is possible to realize an intake shape that smoothly intakes air, such as a bell mouth, and the flow disturbance at the intake port 3 is reduced. The ventilation efficiency can be increased.

  Similarly, by extending the curved portion 16 in the outer peripheral direction further from the outer peripheral portion of the impeller 2, the distance from the casing 8 and the air guide 7 can be narrowed to reduce the gap, thereby suppressing leakage loss and loss due to recirculation. it can.

  Further, as shown in FIG. 7B, by providing a fitting portion 21 for fitting the curved portion 16 to the front shroud 4, there is no step at the boundary portion 22 between the curved portion 16 and the front shroud 4, and the impeller It is easy to widen the cross-sectional area of the two channels.

  In addition, the intake port 3 side and the impeller 2 outer peripheral part side of the curved part 16 can reduce the collision loss to the curved part 16 by providing the shape smoothly connected to the front shroud 4.

(Embodiment 7)
FIG. 8 shows an impeller of an electric blower in Embodiment 7 of the present invention. The same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in the figure, in the present embodiment, a mountain-shaped hub 23 and a plurality of guides formed substantially radially from the hub 23 and inclined in the rotation direction of the impeller 2 are disposed in the vicinity of the intake port 3 of the impeller 2. The inducer 12 is composed of a blade 13, and the guide blade 13 is connected to the blade 6, and the front shroud 4 and the front shroud 4 and the blade 6 are fixed by caulking.

  And the curved part 16 was provided along the junction part of the front shroud 4, each blade 6, and the guide blade 13, and it was set as the structure by which the curved part 16 is clamped between the front shroud 4, the blade 6, and the guide blade 13. Thus, fillets, that is, curved shapes are formed at the substantially rectangular four corners of the flow path in the impeller 2 including the guide vanes 13 of the inducer 12, and the disturbance of the secondary flow at the four corners is suppressed.

  In addition, the hub 23 and the guide blade 13 are an integrally processed product made by resin molding or cutting, and a root curved portion 24 is formed at a joint portion between the hub 23 and the guide blade 13.

  As a result, curved shapes are formed at the four corners of the cross section of the flow path, and the disturbance of the secondary flow in the flow path is further suppressed.

  Further, since the bending portion 16 is sandwiched between the front shroud 4 and the blade 6 having high strength, the bending portion 16 is attached without impairing the assembly strength of the impeller 2 itself. At this time, the curved portion 16 firmly attached also firmly fixes the guide vane 13 of the inducer 12.

  As a result, even if the intake port 3 of the impeller 2 has the inducer 12 having a complicated shape, the air blowing efficiency can be easily increased. In addition, the curved portion 16 can be formed while maintaining the strength of the impeller 2 itself. Can be fixed easily and firmly.

  When both the curved portion 16 and the guide vane 13 of the inducer 12 are made of resin, they can be more firmly fixed by a bonding method such as adhesion, thermal welding, or ultrasonic welding.

  In addition, by providing the blade collapse support portion 20 shown in the fourth embodiment, the guide blade 13 is supported over the whole, and in particular, the guide blade of the blade 6 and / or the inducer 12 due to the centrifugal force generated from the high speed rotation. It is possible to prevent the vicinity of the inlet tip portion of 13 from falling and deforming.

(Embodiment 8)
FIG. 9 shows a vacuum cleaner according to Embodiment 8 of the present invention.

  As shown in the figure, in the present embodiment, the electric blower 26 is provided in the cleaner body 25, and dust is sucked together with the air flow from the suction nozzle 27, and dust is stored in the dust collecting chamber 28.

  Here, by using the electric blower shown in any of Embodiments 1 to 7 as the electric blower 26, the suction performance is high and comfortable cleaning can be performed.

  As described above, since the electric blower according to the present invention can improve the blowing efficiency and facilitate the assembly, it is necessary not only for the vacuum cleaner but also for the strength at high speed rotation and for suppressing the energy consumption. The present invention is also applicable to a certain suction device, blower, etc., or a compressor, turbine, or liquid pump. Moreover, since the vacuum cleaner using this electric blower has high suction performance, it is particularly useful as a vacuum cleaner used in general homes.

The front view which showed half of the electric blower in Embodiment 1 of this invention in the cross section (A) Half sectional view of impeller of electric blower (b) AA sectional view of (a) (c) BB sectional view of (a) The exploded sectional view of the impeller of the electric blower in Embodiment 2 of the present invention The exploded sectional view of the impeller of the electric blower in Embodiment 3 of the present invention Partial sectional view of the impeller of the electric blower in Embodiment 4 of the present invention (A) Disassembled cross-sectional view before impeller assembly of electric blower in Embodiment 5 of the present invention (b) Cross-sectional view after the impeller assembly (A) Half sectional view of impeller in Embodiment 6 of the present invention (b) Half sectional view showing another example of the impeller (A) Half sectional view of the impeller in Embodiment 7 of the present invention (b) CC sectional view of (a) The block diagram which shows the vacuum cleaner in Embodiment 8 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric motor 2 Impeller 3 Air inlet 4 Front surface shroud 5 Rear surface shroud 6 Blade 11 Projection caulking part 12 Inducer 13 Guide blade 16 Curved part 18 Toroidal curved part 20 Blade fall support part 23 Hub

Claims (10)

An impeller that is rotationally driven by an electric motor includes a front shroud having an air inlet, a rear shroud that is spaced apart from the front shroud, and a plurality of blades that are sandwiched by the front shroud and the rear shroud. The front shroud, the rear shroud, and the blade are integrally fixed, and at least a joint portion between the front shroud and the blade is provided with a curved portion along the joint portion, and the curved portion is provided with the front shroud and the blade. Electric blower configured to be sandwiched between blades. An inducer having a chevron-shaped hub and a plurality of guide vanes formed substantially radially from the hub and connected to the blades is provided in the vicinity of the air inlet of the front shroud, and the curved portion is provided with the front shroud, the blades, and the guide vanes. The electric blower according to claim 1, wherein the electric blower is provided along at least one of the joints. The electric blower according to claim 1 or 2, wherein the plurality of curved portions are integrated by connecting them in an annular shape to form an annular curved portion. The electric blower according to any one of claims 1 to 3, wherein the bending portion is configured to be fastened together with a protrusion caulking portion of the blade. The electric blower according to any one of claims 1 to 4, wherein the curved portion is attached to the front shroud and then sandwiched between the front shroud and the blade. The electric blower according to any one of claims 1 to 5, wherein the bending portion is provided with a blade collapse support portion at the rear of the impeller in the rotation direction. 7. The bending portion according to claim 1, wherein a part of the bending portion is deformable and is deformed when sandwiched between the front shroud and the blade and is in close contact with at least one of the blade and the front shroud. Electric blower. The electric blower according to any one of claims 1 to 7, wherein the curved portion is provided over substantially the entire area of the outer peripheral portion of the impeller from the air inlet of the impeller. The electric blower according to any one of claims 1 to 7, wherein a fitting portion for fitting the curved portion to the front shroud is provided, and a step is eliminated at a boundary portion between the curved portion and the front shroud. The vacuum cleaner which has an electric blower of any one of Claims 1-9.