JP2009041391A - Electric blower and vacuum cleaner using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric blower increased in blowing efficiency by securing the airtightness between a casing and suction guide when the casing is secured to the suction guide. <P>SOLUTION: The contact surface between the generally cylindrical outer peripheral side-surface of the suction guide 7 and the recessed part of the casing 5 has a zone parallel to the axis of a rotor 3. The outer peripheral dimension of the portion of the suction guide 7 in the parallel zone is larger than the inner diameter dimension of the recessed part of the casing 5. The suction guide is press-fitted to the casing. Since leakage loss due to air leakage from the press-fitted part is eliminated, the electric blower with high airtightness can be provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electric blower used for a vacuum cleaner or the like.

  The structure of the electric blower for a vacuum cleaner used in the conventional technology will be described with reference to FIGS. FIG. 8 is a partial cross-sectional view showing the structure of a conventional electric blower, FIG. 9 is a structural view of a conventional intake guide, and FIG. 10 is an enlarged cross-sectional view of a conventional casing and an intake guide attached. 8, 9, and 10, 1 is a motor having a stator 2 inside and a rotor 3 that rotates at high speed, 4 is an impeller that is fixed to a rotating shaft 6 of the rotor 3 and rotates together with the rotor 3, and 5 is in front of the impeller 4. The casing is located and has a substantially cylindrical intake guide 7 in the center. The intake guide 7 is fixed by welding the casing 5 and a plurality of welding projections 7 c protruding from the intake guide 7.

  About the electric blower comprised as mentioned above, the operation | movement is demonstrated below. When power is applied to the motor 1, the rotor 3 rotates at high speed. Next, when the rotor 3 rotates, the impeller 4 fixed to the rotating shaft 6 rotates. When the impeller 4 rotates at a high speed, air is sucked from the intake guide and guided to the inside of the motor 1 through the impeller 4. Thereafter, the air guided to the inside of the motor 1 is discharged to the outside while cooling the motor 1.

However, in the configuration as described above, the casing 5 and the intake guide 7 are fixed by simply welding and fixing the plurality of welding projections 7c of the intake guide 7 between the casing 5 and the processing dimensions of the parts. Due to the relationship between accuracy and assembly dimensional accuracy, the fixing of the abutting portion other than the welded portion becomes unstable, the airtightness of the casing 5 and the intake guide 7 is lowered, and the abutting portion of the abutting portion is reduced like the air flow shown in FIG. Air leaks from the gap to the outside of the casing 5 and the air blowing efficiency decreases. Further, as a means for ensuring the airtightness of the casing 5 and the intake guide 7, a method of increasing the airtightness by providing a minute convex portion 7b on the abutment surface of the outer periphery of the intake guide 7 and elastically deforming it is proposed. Has been. However, the airtightness varies depending on the molding state of the projections, and since elastic deformation is used, a force in the direction of inhibiting the welding and fixing of the intake guide 7 is applied, so that reliable airtightness can be ensured. It was difficult (see, for example, Patent Document 1).
JP 2000-64993 A

  SUMMARY OF THE INVENTION The present invention provides an electric blower in which the problems of the above-described conventional example are secured, and when the casing and the intake guide are fixed, the airtightness between the casing and the intake guide is reliably ensured and the blowing efficiency is increased. Objective.

  In order to solve the conventional problem, an electric blower of the present invention includes an electric motor configured by storing a stator and a rotor in a bracket, an impeller fixed to the shaft of the rotor, and generating a suction force by rotation, In the vicinity of the outside of the impeller inlet, a substantially cylindrical resin air intake guide that guides the air flow into the impeller is arranged, and the air intake guide is press fitted and fixed to the outer periphery of the bracket of the electric motor so as to cover the impeller. The substantially cylindrical outer peripheral side surface of the intake guide and the contact surface of the casing recess have a section parallel to the axis of the rotor, and are inserted into the recess provided in the portion from the impeller side, and the parallel of the intake guide Since the outer peripheral dimension of the section of the section is larger than the inner diameter dimension of the casing recess and is press-fitted and fixed, the parallel circle of the casing and the intake guide It becomes interference fit is part together, there is no leakage loss due to air leakage from the department, the electric blower having high airtightness is obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the electric blower which has high air performance, and a vacuum cleaner carrying it can be provided.

  According to a first aspect of the present invention, there is provided an electric motor configured by housing a stator and a rotor in a bracket, an impeller fixed to the shaft of the rotor and generating a suction force by rotation, A substantially cylindrical resin-made air intake guide that guides the airflow to the motor is arranged, and the air intake guide is inserted from the impeller side into a recess provided in the central portion of the casing that is press-fitted and fixed to the outer periphery of the bracket of the electric motor so as to cover the impeller. The substantially cylindrical outer peripheral side surface of the intake guide and the contact surface of the casing recess have a section parallel to the axis of the rotor, and the outer periphery dimension of the portion of the parallel section of the intake guide is determined by the casing recess. Since the inner cylindrical dimension of the casing and the intake guide are fixed by press-fitting, the parallel cylindrical parts of the casing and the intake guide are closely fitted together, and the Eliminates leakage losses due to leakage, the electric blower having high airtightness is obtained.

  In the second aspect of the present invention, one or a plurality of circumferential minute convex ribs are provided on the substantially cylindrical outer peripheral side surface of the intake guide. Therefore, when the intake guide is press-fitted into the casing recess, the minute convex ribs are crushed by the fit. Even when the roundness of the casing or the intake guide is low, air leakage can be reliably prevented.

  According to a third aspect of the present invention, one or a plurality of annular convex ribs are provided on the substantially cylindrical top surface (negative pressure side surface) of the intake guide, and the convex ribs are welded and fixed to the inner surface of the casing concave portion. Since it is characterized, in addition to maintaining airtightness on the outer periphery of the intake guide, it is possible to secure more reliable airtightness by maintaining airtightness on the top surface.

  According to a fourth aspect of the present invention, an annular or circumferential concave portion is provided on the substantially cylindrical top surface (negative pressure side surface) or side surface of the intake guide, and the filler is poured all over the concave portion. A minute gap can be filled, and the airtightness can be surely produced without moving the intake guide minutely to deteriorate the airtightness.

  According to a fifth aspect of the present invention, the air intake guide is inserted, each end surface of the casing recess is bent toward the air intake guide side, and each end surface is bitten into a cut portion smaller than the thickness of the casing provided in the air intake guide. In addition to ensuring airtightness at the outer periphery of the guide, air leakage can also be prevented at the casing end face.

  According to a sixth aspect of the invention, there is provided an electric motor configured by housing a stator and a rotor in a bracket, an impeller fixed to the shaft of the rotor and generating a suction force by rotation, A substantially cylindrical resin-made air intake guide that guides the airflow to the motor is installed, and the air intake guide is integrally formed at the center of the casing that is press-fitted and fixed to the outer periphery of the bracket of the motor so as to cover the impeller, thereby welding and bonding Thus, the most simple and stable airtightness can be secured.

  7th invention is made into the vacuum cleaner provided with the electric blower of any one of 1st-6th invention, and can provide the vacuum cleaner which improved the ventilation efficiency of the electric blower.

  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)
A first embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected about the same component as a prior art example, and the description is abbreviate | omitted.

  1 is a partial cross-sectional view showing the configuration of the electric blower of the present invention, FIG. 2 (a) is a plan view of the intake guide 7, and FIG. 2 (b) is a cross-sectional view of the casing 5 and the intake guide 7. In FIGS. 1 and 2, reference numeral 7 denotes an intake guide, which is press-fitted and attached to the central recess of the casing 5 from the inner surface of the casing 5. Thereafter, the plurality of convex portions 7 c protruding from the top surface of the intake guide 7 penetrate the plurality of through holes 8 provided on the top surface of the casing 5, and are fixed to the casing 5 by welding the convex portions 7 c of the intake guide 7. Is done. At this time, a straight portion is provided in parallel to the rotating shaft 6 on the outer diameter of the intake guide 7, and a straight portion is similarly provided in the concave portion of the casing 5. The inner diameter D2 of the recess is set to D1-D2 = 0 to 0.3 mm.

  Under the above configuration, when a voltage is applied to the motor 1, the rotor 3 rotates at a high speed. Next, when the rotor 3 rotates, the impeller 4 fixed to the rotating shaft 6 rotates. Therefore, when the impeller 4 rotates at a high speed, air is sucked from the suction port of the intake guide 7 and is guided into the motor 1 through the impeller 4. Here, the air discharged from the outlet of the impeller 4 has an outer periphery of the intake guide 7 that is in close contact with the casing 5 to ensure airtightness, so that a backflow of air from the contact portion to the outside of the casing 5 occurs. Therefore, the air can be smoothly guided from the outlet of the impeller 4 without leaking into the motor 1. Normally, the casing 5 is made by sheet metal squeezing, and it is possible to obtain accuracy on the order of 100%. Since the intake guide 7 is a thermoplastic resin, the outer diameter dimension is some extent even in consideration of the operating environment and the like. With variations. However, since D1-D2 is set as described above, the air intake guide 7 has an interference fit with respect to the casing 5 in any environment, and airtightness is always maintained.

  Thus, according to the present embodiment, by press-fitting the intake guide 7 and the casing 5 with a certain size, it is possible to prevent air leakage from the contact portion in any operating environment of the electric blower, An air blower with reduced air loss and high air performance can be realized.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment and the conventional example are denoted by the same reference numerals, and the description thereof is omitted. Further, the electric motor portion is the same as the conventional example, and the drawing is omitted.

  FIG. 3 is a cross-sectional view of the casing 5 with the intake guide 7 attached thereto. Reference numeral 9 denotes a plurality of circumferentially minute convex ribs provided on the outer peripheral portion of the intake guide 7. When the intake guide 7 is attached to the central recess of the casing 5 from the inside of the casing 5, The minute convex rib 9 is brought into contact with the inner periphery of the concave portion of the casing 5 and is pressed into the casing 5 while crushing the convex rib 9 somewhat. Thereafter, the plurality of convex portions 7 c protruding from the top surface of the intake guide 7 penetrate the plurality of through holes 8 provided on the top surface of the casing 5, and are fixed to the casing 5 by welding the convex portions 7 c of the intake guide 7. Has been.

  Under the above configuration, when a voltage is applied to the motor 1, the rotor 3 rotates at a high speed. Next, when the rotor 3 rotates, the impeller 4 fixed to the rotating shaft 6 rotates. Therefore, when the impeller 4 rotates at a high speed, air is sucked from the suction port of the intake guide 7 and is guided into the motor 1 through the impeller 4. Here, the air discharged from the outlet of the impeller 4 has an outer periphery of the intake guide 7 that is in close contact with the casing 5 to ensure airtightness, so that a backflow of air from the contact portion to the outside of the casing 5 occurs. Therefore, the air can be smoothly guided from the outlet of the impeller 4 without leaking into the motor 1.

  As described above, according to the present embodiment, when the intake guide 7 is press-fitted to the casing 5, the circumferential minute convex ribs 9 provided on the outer peripheral portion thereof are somewhat crushed, while being somewhat crushed on the casing 5. On the other hand, since it is press-fitted, airtightness can be reliably maintained, air loss is reduced, and an electric blower with high air performance can be realized.

(Embodiment 3)
A third embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment and the conventional example are denoted by the same reference numerals, and the description thereof is omitted. Further, the electric motor portion is the same as the conventional example, and the drawing is omitted.

  FIG. 4 is a cross-sectional view of the casing 5 with the intake guide 7 attached thereto. Reference numeral 10 denotes an annular minute convex rib provided on the top surface portion of the intake guide 7. When the intake guide 7 is attached to the central recess of the casing 5 from the inside of the casing 5, the annular minute rib is provided. The convex rib 10 contacts the inside of the top surface portion of the casing 5. After that, when the plurality of convex portions 7c of the intake guide 7 protruding from the top surface through the plurality of through holes 8 provided on the top surface of the casing 5 are welded and fixed, the annular convex ribs 10 are also welded simultaneously. The casing 5 is in close contact with the inner surface of the recess.

  Under the above configuration, when a voltage is applied to the motor 1, the rotor 3 rotates at a high speed. Next, when the rotor 3 rotates, the impeller 4 fixed to the rotating shaft 6 rotates. Therefore, when the impeller 4 rotates at a high speed, air is sucked from the suction port of the intake guide 7 and is guided into the motor 1 through the impeller 4. Here, the air discharged from the outlet of the impeller 4 has an annular minute convex rib 10 on the top surface of the intake guide 7 that is in close contact with the casing 5 by welding to ensure airtightness. No back flow of air from the outer side of the casing 5 to the outside of the casing 5 occurs, and the air is smoothly guided from the outlet of the impeller 4 without leaking into the motor 1.

  As described above, according to the present embodiment, when the intake guide 7 is welded to the casing 5, the annular convex rib 10 on the top surface is also welded at the same time, thereby preventing air leakage from the contact portion. It is possible to realize an electric blower with reduced air loss and high air performance.

(Embodiment 4)
A fourth embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment and the conventional example are denoted by the same reference numerals, and the description thereof is omitted. Further, the electric motor portion is the same as the conventional example, and the drawing is omitted.

  FIG. 5 is a cross-sectional view of the casing 5 in which the intake guide 7 is press-fitted. Reference numeral 11 denotes an annular minute concave portion provided in the top surface portion of the intake guide 7, and the intake guide 7 is press-fitted into the concave portion of the casing 5. In this state, an adhesive is poured into the gaps between the plurality of convex portions 7 c of the intake guide 7 and the through holes 8. The adhesive is poured into the annular recess 11 so as to enter the annular recess 11, and then the plurality of projections 7 c of the intake guide 7 are welded and fixed.

  Under the above configuration, when a voltage is applied to the motor 1, the rotor 3 rotates at a high speed. Next, when the rotor 3 rotates, the impeller 4 fixed to the rotating shaft 6 rotates. Therefore, when the impeller 4 rotates at a high speed, air is sucked from the suction port of the intake guide 7 and is guided into the motor 1 through the impeller 4. Here, the air discharged from the outlet of the impeller 4 is kept airtight with the casing 5 because of the adhesive that has flowed into the minute annular recess 11 on the top surface of the intake guide 7. The backflow of air to the outside of the casing 5 does not occur from the gap of the contact portion, and the air is smoothly guided from the outlet of the impeller 4 without leaking into the motor 1.

  As described above, according to the present embodiment, before the intake guide 7 is welded to the casing 5, the annular recess 11 on the top surface is filled with the adhesive, and the gap between the casing 5 and the casing 5 is eliminated. Air leakage from the contact portion can be prevented, air loss is reduced, and an electric blower with high air performance can be realized.

(Embodiment 5)
A fifth embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment and the conventional example are denoted by the same reference numerals, and the description thereof is omitted. Further, the electric motor portion is the same as the conventional example, and the drawing is omitted.

  FIG. 6 is a cross-sectional view of the casing 5 in which the intake guide 7 is press-fitted. Reference numeral 12 denotes a bent portion formed by bending the end face of the through-hole 8 and the inner peripheral end face of the casing 5 by 90 degrees toward the motor 1, and is press-fitted into a recess provided in the intake guide 7. The recess is set to have a width slightly smaller than the thickness of the casing 5. Thereafter, the plurality of convex portions 7c of the intake guide 7 are welded and fixed.

  Under the above configuration, when a voltage is applied to the motor 1, the rotor 3 rotates at a high speed. Next, when the rotor 3 rotates, the impeller 4 fixed to the rotating shaft 6 rotates. Therefore, when the impeller 4 rotates at a high speed, air is sucked from the suction port of the intake guide 7 and is guided into the motor 1 through the impeller 4. Here, the air discharged from the outlet of the impeller 4 is kept airtight with the casing 5 by the sealing effect of the bent portion 12 of the casing 5 that has entered the intake guide 7, and the casing is opened from the gap between the contact portions. 5 Back flow of air to the outside does not occur, and the air is smoothly guided without leaking from the outlet of the impeller 4 into the motor 1.

  As described above, according to the present embodiment, the end surface of the casing 5 is bitten into the intake guide 7 and then welded to eliminate the gap between the casing 5 and prevent air leakage from the contact portion. Therefore, an air blower with reduced air loss and high air performance can be realized.

(Embodiment 6)
A sixth embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment and the conventional example are denoted by the same reference numerals, and the description thereof is omitted. Further, the electric motor portion is the same as the conventional example, and the drawing is omitted.

  FIG. 7 is a sectional view of the casing 5 in which the intake guide 7 is integrally formed. The air intake guide 7 is formed without gaps or rattling with respect to the casing 5 because the resin flows through the plurality of through holes 8 of the casing 5 during integral molding.

  Under the above configuration, when a voltage is applied to the motor 1, the rotor 3 rotates at a high speed. Next, when the rotor 3 rotates, the impeller 4 fixed to the rotating shaft 6 rotates. Therefore, when the impeller 4 rotates at a high speed, air is sucked from the suction port of the intake guide 7 and is guided into the motor 1 through the impeller 4. Here, the air discharged from the outlet of the impeller 4 is kept airtight with the casing 5 due to the tightness of the intake guide 7 that is integrally formed without any gaps or backlash. No backflow of air to the outside occurs, and the air is smoothly guided without leaking from the outlet of the impeller 4 into the motor 1.

  As described above, according to the present embodiment, since the air intake guide 7 is integrally formed with the casing 5, the gap between the casing 5 and the casing 5 is eliminated, so that air leakage from the contact portion can be prevented, and air loss can be prevented. Is reduced. In addition, it is possible to realize an electric blower that does not require a process such as welding, has good dimensional stability, and high air performance.

  As described above, since the electric blower according to the present invention and the electric vacuum cleaner using the electric blower can improve the efficiency of the electric blower and the suction work rate of the electric vacuum cleaner, the household electric appliance using the electric blower It can be applied to a wide range of applications such as industrial equipment.

Sectional drawing of the principal part of the electric blower which shows the 1st Embodiment of this invention (A) The principal part top view of an intake guide (b) The principal part exploded sectional view showing the image of the state before a casing and an intake guide before fitting Sectional drawing of the principal part of the electric blower which shows the 2nd Embodiment of this invention Sectional drawing of the principal part of the electric blower which shows the 3rd Embodiment of this invention (A) The top view of the suction guide of the electric blower in the 4th Embodiment of this invention (b) The principal part expanded sectional view around the welding convex part of the intake guide of the electric blower same. Sectional drawing of the principal part of the electric blower which shows the 5th Embodiment of this invention Sectional drawing of the principal part of the electric blower which shows the 6th Embodiment of this invention Partial sectional view showing a conventional electric blower (A) Sectional view of intake guide of conventional electric blower (b) Bottom view of intake guide Enlarged cross-sectional view showing the conventional casing and intake guide installation

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 2 Stator 3 Rotor 4 Impeller 5 Casing 6 Rotating shaft 7 Intake guide 7b Minute convex part 7c Welding convex part 8 Through hole 9 Circumferential minute convex rib 10 Circular minute convex rib 11 Circular minute Concave part 12 Bent part

Claims (7)

An electric motor configured by housing a stator and a rotor in a bracket, an impeller fixed to the rotor shaft and generating a suction force by rotation, and a substantially cylinder for guiding an air flow into the impeller near the outside of the inlet of the impeller A resin-made air intake guide, and the air intake guide is inserted from a side of the impeller into a recess provided in a central portion of a casing that is press-fitted and fixed to the outer periphery of the bracket of the electric motor so as to cover the impeller. And the contact surface of the casing recess has a section parallel to the axis of the rotor, and the outer peripheral dimension of the parallel section of the intake guide is larger than the inner diameter dimension of the casing recess. An electric blower characterized by being press-fitted and fixed. The electric blower according to claim 1, wherein one or a plurality of circumferential minute convex ribs are provided on a substantially cylindrical outer peripheral side surface of the intake guide. 2. A single or a plurality of annular convex ribs are provided on the substantially cylindrical top surface (negative pressure side surface) of the intake guide, and the convex ribs are welded and fixed all around the inner surface of the casing concave portion. Or the electric blower of any one of 2. 4. A substantially cylindrical top surface (negative pressure side surface) or side surface of the intake guide is provided with an annular or circumferential recess, and the filler is poured all over the recess. The electric blower according to item 1. 5. The air guide according to claim 1, wherein each end surface of the casing recess into which the air intake guide is inserted is bent toward the air intake guide, and each end surface is bitten into a cut portion smaller than the thickness of the casing provided in the air intake guide. The electric blower described in the item. An electric motor configured by housing a stator and a rotor in a bracket, an impeller fixed to the rotor shaft and generating a suction force by rotation, and a substantially cylinder for guiding an air flow into the impeller near the outside of the inlet of the impeller An electric blower formed by integrally molding a central portion of a casing that is press-fitted and fixed to the outer periphery of the bracket of the electric motor so as to cover the impeller. The vacuum cleaner provided with the electric blower of any one of Claims 1-6.

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