JP2008038790A - Electric blower and electric vacuum cleaner using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric blower which enhances blast efficiency and prevents an impeller from being deformed even though the acceleration is applied from the outside. <P>SOLUTION: In at least one of clearances A between a rear shroud 5 and a substrate 12 of an air guide 10 and between a front shroud 4 and a casing 13, the axial distance is gradually increased from the center toward the outer periphery. A size of the clearance A is made equal to the size of the inclination of the impeller 2 by external force. By so doing, the clearance A is minimized to reduce the volume of air circulating in the clearance A. The production of turbulent flow at an area irrelevant to the mainstream is prevented to enhance blast efficiency. Even though the impeller 2 is inclined due to application of external force, as a result, the impeller 2 does not come into contact with at least one of substrate 12 and casing 13 so as to be prevented from being deformed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric blower for preventing impeller deformation and a vacuum cleaner using the same.

  Conventionally, an electric blower that has prevented this type of impeller deformation has already been proposed (see, for example, Patent Document 1).

This is because the impeller is enclosed by the air guide and the casing, and the axial clearance between the rear shroud and the air guide substrate constituting the impeller and the axial clearance between the front shroud and the casing are gradually increased from the center to the outer periphery. It is set as the structure which becomes.
JP-A-8-193593

  However, in the conventional configuration, when the axial gap between the rear shroud and the air guide substrate and the axial gap between the front shroud and the casing are secured large, even if the impeller tilts due to external force applied, Impeller deformation can be prevented without touching the air guide substrate or casing, but the volume of air circulating in the gap increases and a large amount of turbulent flow is formed at locations unrelated to the main flow, resulting in air blowing efficiency. It had the subject of reducing.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide an electric blower capable of improving the blowing efficiency and preventing impeller deformation even when acceleration is applied from the outside, and a vacuum cleaner using the electric blower. .

  In order to solve the above-described conventional problems, the electric blower of the present invention is configured such that at least one of the gaps between the rear shroud and the air guide substrate and between the front shroud and the casing has an axial distance from the center toward the outer periphery. The gap is gradually increased, and the size of the gap is made equal to the size by which the impeller is inclined by an external force.

  This minimizes the gap, reduces the volume of air circulating in the gap, suppresses the formation of turbulent flow at locations unrelated to the main flow, increases the blowing efficiency, and adds external force to the impeller. Even if the air guide tilts, the substrate of the air guide and at least one of the casings do not come into contact with each other, and impeller deformation can be prevented.

  In addition, the vacuum cleaner using this electric blower has high suction performance with a minimum gap, and even if the electric blower is accelerated by moving and rotating quickly, the impeller can be prevented from deforming and can be cleaned comfortably. .

  The electric blower of the present invention and the vacuum cleaner using the same can improve the blowing efficiency and prevent impeller deformation even when acceleration is applied from the outside.

  According to a first aspect of the present invention, there is provided an air guide having an impeller having a front shroud, a rear shroud, and a plurality of blades between the shrouds, a plurality of stationary blades located on an outer periphery of the impeller, and a substrate thereof, and the air A casing including an impeller together with a guide and having an intake hole in the center; and an electric motor for rotationally driving the impeller; and at least one of a gap between the rear shroud and the substrate and between the front shroud and the casing; By making the axial distance gradually increase from the center to the outer periphery, and the electric blower configured to make the size of the gap equal to the size by which the impeller is inclined by an external force, the gap is minimized. Reducing the volume of air circulating in the gap and creating a turbulent flow in a location unrelated to the mainstream The restrained, blowing efficiency can be enhanced, even inclined impeller external force is applied, in which attained impellers deformation preventing not in contact with at least one of the air guide of the substrate and the casing.

  In the second invention, in particular, in the first invention, since the gap is formed by inclining at least one of the air guide substrate and the casing, the axial distance gradually increases from the central portion toward the outer periphery. And a gap having a size equal to the size of the impeller tilted by an external force can be easily configured.

  In the third invention, in particular, in the second invention, the degree of inclination of the substrate or the casing is increased on the outer peripheral side as compared with the vicinity of the center portion, so that a large acceleration is applied to the impeller by the electric blower. When tilting, even if the impeller itself undergoes bending deformation and further tilts in the direction closer to the substrate or the casing, a larger gap is secured by an amount corresponding to the bending deformation. Therefore, there is no contact between at least the rear shroud and the substrate and the front shroud and the casing, and the impeller is not deformed.

  According to a fourth aspect of the invention, in particular, in the second or third aspect of the invention, the rear shroud is a flat plate, the opposing substrate is inclined, and the substrate is substantially the same thickness. The axial height of the air passage on the opposite side of the surface facing the rear shroud) can be made higher in the center compared to the outer periphery, so that the pressure recovery as a diffuser can be effectively performed and the air blowing efficiency is increased. It is.

  According to a fifth aspect of the invention, in particular, in any one of the second to fourth aspects of the invention, the impeller fastens the blade to at least one of the front shroud and the rear shroud by facing the caulking, and faces the caulking protrusion by the caulking. By providing an annular groove on at least one of the substrate and the casing, the impeller and the substrate can be made into a minimum gap including a rear shroud or front shroud and a caulking protrusion. Alternatively, the impeller is not deformed without contact with the casing, and the air blowing efficiency is increased.

  According to a sixth invention, in particular, in any one of the second to fifth inventions, by providing an annular groove in at least one of the substrate and the casing at a location facing the outer peripheral end of the impeller, When the impeller tilts due to a large acceleration, even if the impeller is deformed and tilted in the direction closer to the substrate or casing, a large gap is secured by an amount corresponding to the deformation of the outer periphery of the impeller. Therefore, at least one of the outer peripheral end of the rear shroud and the substrate, or the outer peripheral end of the front shroud and the casing does not contact, and the impeller is not deformed.

  According to a seventh invention, in particular, in the fifth or sixth invention, at least one of the air guide and the casing is a resin molded product, and a gate at the time of injection molding is arranged in an annular groove, so that the gate remains. It is not necessary to provide the fine projections on the main surface other than the groove portion, and the flow disturbance caused by the fine projections can be suppressed.

  The eighth aspect of the invention is particularly an electric vacuum cleaner having the electric blower according to any one of the first to seventh aspects of the invention, so that the gap is minimized, the suction performance is high, and the electric vacuum is quickly moved and rotated. Even if acceleration is applied to the blower, the impeller can be prevented from deforming 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 to 3 show an electric blower according to Embodiment 1 of the present invention.

  As shown in the drawing, the electric blower according to the present embodiment includes an impeller 2 having a front shroud 4, a rear shroud 5, and a plurality of blades 6 between the shrouds, and a plurality of static blades positioned on the outer periphery of the impeller 2. An air guide 10 having a blade 11 and a substrate 12 thereof, a casing 13 provided on the outer periphery of the air guide 10 and including the impeller 2 together with the air guide 10, and a suction hole 14 in the center, and the impeller 2 are driven to rotate. And an electric motor 1 to be operated.

  The impeller 2 has an air inlet 3 facing the intake hole 14 at the center. Further, the front shroud 4, the rear shroud 5, and the plurality of blades 6 constituting the impeller 2 are all made of sheet metal in the present embodiment, and these three parts are fastened by caulking, as shown in FIG. In addition, an annular groove 16 is provided in the base plate 12 and the casing 13 facing the caulking protrusion 15 by caulking. An annular groove portion 17 is also provided at the outer peripheral end of the impeller 2, that is, at the substrate 12 and the casing 13 facing the outer peripheral ends of the front shroud 4 and the rear shroud 5. Further, the substrate 12 and the casing 13 of the air guide 10 are resin molded products, and a gate 18 at the time of injection molding is arranged in a part of the annular grooves 16 and 17, and minute projections remaining on the gate 18 are formed here. I can do it.

  Further, the impeller 2 has a rear shroud 5 fixed to the rotating shaft 7 of the electric motor 1 with a nut through a washer.

  The gap A between the rear shroud 5 and the substrate 12 and between the front shroud 4 and the casing 13 is set such that the axial distance gradually increases from the center toward the outer periphery, and the size of the gap A is set to the outside. The impeller 2 is configured to be equal in magnitude to the inclination of the impeller 2 (inclination due to the assumed maximum acceleration). In the present embodiment, the gap A is formed by inclining the substrate 12 of the air guide 10 and the top surface of the casing 13. When the substrate 12 is inclined, the rear shroud 5 is a flat plate, and the opposing substrate 12 is configured to have substantially the same thickness.

  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 high speed, sucks air from the intake hole 14 of the casing 13, and then sucks air from the air inlet 3 of the impeller 2, and this air flow is generated by the front shroud 4, the rear shroud 5, Then, it passes through the internal flow path surrounded by the two blades 6 and is discharged from the outer periphery of the impeller 2.

  The air flow discharged from the impeller 2 passes between the stationary blades 11 of the air guide 10, and after passing through the outer peripheral wall of the casing 13, passes while cooling the back surface of the air guide 10 and subsequently the inside of the electric motor 1. The air is discharged from the exhaust hole 1a provided in the electric motor 1 to the outside of the electric motor.

  At this time, by reducing the axial distance of the gap A between the rear shroud 5 and the substrate 12, the volume of the air circulating in the gap A is reduced, and the formation of a turbulent flow at a location unrelated to the main flow is suppressed. is there. The same applies to the gap A between the front shroud 4 and the casing 13.

  Here, when acceleration is applied from the outside of the electric blower when it is incorporated in a mobile device or the like, the impeller 2 may tilt toward the substrate 12 with the fixed central portion 7a as the center (state indicated by a broken line in FIG. 3A), On the contrary, the impeller 2 is inclined toward the casing 13 (a state indicated by a broken line in FIG. 3B).

  At this time, since the substrate 12 is inclined in advance by the maximum angle at which the impeller 2 is inclined, the impeller 2 does not contact the substrate 12 and can continue to rotate at a high speed. The same applies to the gap between the front shroud 4 and the casing 13.

  Further, the caulking protrusion 15 protruding from the rear shroud 5 is also provided with an annular groove 16 at the opposite position of the substrate 12, so that the caulking protrusion 15 does not come into contact with the groove 16.

  As described above, in the present embodiment, the inclination angle of the substrate 12 is set to be equal to the angle at which the impeller 2 is inclined about the fixed center portion 7a by an arbitrary force from the outside of the electric motor 1. The same acceleration is applied to the electric blower along with the sudden movement and rotation of the mobile device, and the rear shroud 5 and the substrate 12 are brought into contact with each other even when the impeller 2 is inclined about the fixed central portion 7a. In addition, the gap A, which is the axial distance between the two, is minimized, the volume of air circulating in the gap is reduced, and the formation of a turbulent flow at a location unrelated to the main flow is suppressed. The same applies to the gap A between the front shroud 4 and the casing 13.

  As a result, the gap A can be minimized and the air blowing efficiency can be increased, and the impeller 2 is not in contact with the air guide 10 and the casing 13, so that the impeller 2 is not deformed during operation.

  Further, the rear shroud 5 is a flat plate, the opposing substrate 12 is inclined, and the substrate 12 is substantially the same thickness, so that the back surface of the air guide 10 (the opposite side of the surface facing the rear shroud 5 of the substrate 12) ) In the axial direction of the air passage can be made higher in the central portion than on the outer peripheral side, so that the pressure recovery as a diffuser can be effectively performed and the blowing efficiency is increased.

  Further, the front shroud 4 and the rear shroud 5 and the blade 6 are fastened by caulking, and there are caulking protrusions 15 protruding from the front shroud 4 and the rear shroud 5. In the impeller 2 manufactured by caulking, the impeller 2 can be made the smallest gap including the rear shroud 5 or the front shroud 4 and the caulking projecting portion 15 by providing the annular groove portion 16 at the location where the impeller 2 The impeller 2 is not deformed without contact with the substrate 12 or the casing 13, and the air blowing efficiency is improved.

  Further, by providing the annular groove portion 17 at a location facing the outer peripheral ends of the rear shroud 5 and the front shroud 4 of the substrate 12 and the casing 13, the impeller 2 is inclined when the impeller 2 is inclined due to a large acceleration applied by the electric blower. Even if its own deformation is added and it is tilted in the direction closer to the substrate 12 or the casing 13, the gap A is secured as much as the deflection deformation of the outer peripheral end of the impeller 2. The impeller 2 is not deformed without contact between the outer peripheral end of the substrate 12 or the front shroud 4 and the casing 13.

  Further, at least one of the air guide 10 and the casing 13 is a resin molded product, and the gate 18 at the time of injection molding is disposed in any one of the annular grooves 16 and 17, so that the minute protrusions remaining on the gate 18 are grooved. It is not necessary to provide it on the main surface which is other than the above, and it is possible to suppress the flow disturbance caused by the minute protrusions.

  In the present embodiment, the gap A between the rear shroud 5 and the substrate 12 and between the front shroud 4 and the casing 13 is set such that the axial distance gradually increases from the center toward the outer periphery. The size of the gap A is made equal to the size by which the impeller 2 is inclined by an external force, but this configuration is relative to one gap A between the rear shroud 5 and the substrate 12 and between the front shroud 4 and the casing 13. You may make it adopt only. Further, in the configuration of the impeller 2, the blade 6 is fastened to both the front shroud 4 and the rear shroud 5 by caulking, but the caulking may be applied only to one shroud. However, the annular groove 16 may be formed only on the substrate 12 or the casing 13 on the side facing the caulking protrusion 15.

(Embodiment 2)
FIG. 4 shows an electric blower according to Embodiment 2 of the present invention. Since the basic configuration is the same as that of the first embodiment, the same elements are denoted by the same reference numerals and description thereof is omitted.

  In the present embodiment, the inclination of the top surface of the substrate 12 and the casing 13 of the air guide 10 is configured to increase on the outer peripheral side as compared with the vicinity of the central portion.

  As a result, when the impeller 2 tilts due to a large acceleration applied by the electric blower, the impeller 2 itself is deflected and further tilted in the direction closer to the substrate 12 (state shown by the broken line in FIG. 4A), or Even if it is tilted in the direction approaching the casing 13 (the state shown by the broken line in FIG. 4B), a large gap A is secured by an amount corresponding to the bending deformation, so that the rear shroud 5 and the substrate 12 or the front shroud are secured. The impeller 2 is not deformed without contact between the casing 4 and the casing 13.

  As described in the first embodiment, the configuration in the present embodiment is adopted only for one gap A between the rear shroud 5 and the substrate 12 and between the front shroud 4 and the casing 13. Also good.

(Embodiment 3)
FIG. 5 shows a vacuum cleaner according to Embodiment 3 of the present invention.

  As shown in the figure, in the present embodiment, the electric blower 26 having the configuration shown in the first or second embodiment is provided in the cleaner body 25, and dust is supplied from the suction nozzle 27 together with the air flow along the extension pipe 29, Suction is performed through the hose 30 so that dust is stored in the dust collection chamber 28.

  Here, as shown in the first or second embodiment, the electric blower 26 has a high suction performance with the minimum gap A, and even if acceleration is applied to the electric blower 26 by quick movement and rotation, the impeller is deformed. Prevention is possible, and comfortable cleaning is possible. Furthermore, since the ventilation efficiency is high, a vacuum cleaner with reduced energy consumption can be realized.

  As described above, since the electric blower according to the present invention can improve the blowing efficiency and prevent impeller deformation even when acceleration is applied from the outside, the electric blower can be applied to a mobile device, a movable device, and the like. From the viewpoint, it is also applicable to a compressor, a turbine, and a liquid pump. Moreover, since the vacuum cleaner using this electric blower can improve suction performance, it is most suitable for use in general households.

Half sectional view of electric blower in Embodiment 1 of the present invention Top view around the impeller and air guide of the electric blower (A) Main part sectional view showing the impeller movement state of the electric blower (b) Main part sectional view showing another impeller movement state of the electric blower (A) Main part sectional drawing which shows the impeller movement state of the electric blower in Embodiment 2 of this invention (b) Main part sectional drawing which shows the other impeller movement state of the electric blower Schematic sectional view of the electric vacuum cleaner according to Embodiment 3 of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric motor 2 Impeller 4 Front surface shroud 5 Rear surface shroud 6 Blade 7 Rotating shaft 10 Air guide 11 Stator blade 12 Substrate 13 Casing 14 Intake hole 15 Caulking protrusion 16, 17 Annular groove 18 Gate A Gap

Claims (8)

An impeller having a front shroud, a rear shroud, and a plurality of blades between the shrouds, an air guide having a plurality of stationary blades and its substrate positioned on the outer periphery of the impeller, and an impeller including the air guide A casing having a suction hole in the center, and an electric motor for rotating the impeller, wherein at least one of the gaps between the rear shroud and the substrate and between the front shroud and the casing has an axial distance in the center. An electric blower having a configuration in which the gap gradually increases from the outer periphery toward the outer periphery, and the size of the gap is made equal to the inclination of the impeller by an external force. The electric blower according to claim 1, wherein the gap is formed by inclining at least one of a substrate of the air guide and a casing. The electric blower according to claim 2, wherein the outer peripheral side of the board or casing is inclined more than the vicinity of the center portion. The electric blower according to claim 2 or 3, wherein the rear shroud is a flat plate, the opposing substrates are inclined, and the substrates have substantially the same thickness. The impeller includes a blade that is fastened to at least one of the front shroud and the rear shroud by caulking, and an annular groove is provided in at least one of the substrate and the casing that faces the caulking protrusion by the caulking. The electric blower of any one of Claims. The electric blower according to any one of claims 2 to 5, wherein an annular groove is provided in at least one of the substrate and the casing at a location facing the outer peripheral end of the impeller. The electric blower according to claim 5 or 6, wherein at least one of the air guide and the casing is a resin molded product, and a gate at the time of injection molding is arranged in an annular groove. The vacuum cleaner which has an electric blower of any one of Claims 1-7.