JP2012184692A - Electric blower and electric vacuum cleaner using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric blower for reducing fluid loss and enhancing blowing efficiency.SOLUTION: The electric blower includes: an impeller 4 fixed to a rotary shaft 6 of a rotor 3 and rotated; an air guide 11 with a plurality of stationary blades 17 formed in an outer peripheral part and a lower part of the impeller 4; and a fan case 5 made of resins and having a suction opening 7. The fan case 5 is formed by seamlessly integrating a casing 8 for covering the impeller 4 and the air guide 11, and a straightening plate part 10 having an inclined part 10a disposed outside the suction opening 7 and extended from the suction opening 7 to the outside of the machine. Fluid loss including air leak of the straightening plate part 10 and the casing 8 can be reduced, and the performance of the electric blower 1 is improved.

Description

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

  As a conventional electric blower, there is one as shown in FIG. 5 (see, for example, Patent Document 1).

  FIG. 5 is a cross-sectional view of a conventional electric blower described in Patent Document 1 and a vacuum cleaner using the same.

  In FIG. 5, the fan case 5 of the conventional electric blower 1 is made of metal and covers the impeller 4 and the air guide 11 of the electric blower 1, and a resin guide 20 is integrally formed in the fan case 5 in the vicinity of the suction port 7. ing.

  The resin guide 20 is roughly divided into two parts for each role (separated by a broken line in the figure). One is a rectifying plate portion 10 that is gradually inclined toward the suction port 7 to adjust the turbulence of the airflow entering the electric blower 1, and the other is a surface that is continuous with the rectifying plate portion 10, and the impeller 4 The intake guide portion 22 guides the airflow into the impeller 4 while being in contact with the entrance portion. An annular soft member 15 is fitted into the recess 20 a of the resin guide 20, and the entire electric blower 1 is covered with the motor case 13 and is built in the cleaner main body 14.

  The dust collection chamber 26 and the electric blower 1 are partitioned by a partition wall 29 having a lattice 28.

  About the conventional vacuum cleaner comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. When a voltage is applied to the electric blower 1, the impeller 4 rotates at a high speed, so that air flows from the front of the cleaner body 14, and the rectifying plate portion 10, the intake guide portion 22, the impeller 4, the air of the resin guide 20. It flows into the electric blower 1 through the guide 11, cools the inside of the electric motor (not shown), and is discharged from the exhaust port 12.

JP 2010-29259 A

  However, in the configuration of the conventional electric blower, the resin guide 20 is integrally formed with the fan case 5, but depending on the molding conditions, there is a problem that a gap is generated between the two and air leakage occurs. That is, the electric blower 1 may be lost. Moreover, since it is a structure of two parts of a metal and a resin, the material cost is high, and since it is integrally formed, there is a problem that the manufacturing cost is high and the recyclability is poor.

  The present invention solves the above-described conventional problems, and relates to the structure up to the fan case and the intake guide, and further to the intake guide and the rectifying plate, and ensures airtightness between the respective parts and the fan case. It is an object of the present invention to provide an electric blower that reduces fluid loss and further improves the blowing efficiency by making use of the characteristics of a resin fan case and a vacuum cleaner that is excellent in suction performance.

  In order to solve the above-described conventional problems, an electric blower of the present invention includes an impeller fixed to a rotating shaft of a rotor and driven to rotate, and an air guide having a plurality of stationary blades formed on an outer peripheral portion and a lower portion of the impeller. A fan case made of resin and having a suction port, the fan case being located outside the suction port and extending from the suction port toward the outside of the machine, and a casing portion covering the impeller and the air guide. The rectifying plate part with the sloped part that is installed is integrated and seamlessly integrated, which can reduce fluid loss including air leakage between the rectifying plate part and the casing part, and is effective in improving the performance of the electric blower It is.

  Moreover, the vacuum cleaner of this invention uses the electric blower of any one of Claims 1-7, and can implement | achieve a vacuum cleaner with high suction performance.

  The electric blower of the present invention has high air performance, and the electric vacuum cleaner of the present invention can exhibit high suction performance by using an electric blower with good air performance.

Sectional drawing of the electric blower in Embodiment 1 of this invention (A) The principal part expanded sectional view which shows the state before fan case insertion of the electric blower in Embodiment 2 of this invention, (b) The principal part expanded sectional view which shows the state after fan case insertion of the electric blower (A) The principal part expanded sectional view which shows the state before fan case insertion of the electric blower in Embodiment 3 of this invention, (b) The principal part expanded sectional view which shows the state after fan case insertion of the electric blower Partial sectional view of the electric vacuum cleaner according to Embodiment 4 of the present invention. Sectional drawing which shows the conventional electric blower and vacuum cleaner

  According to a first aspect of the present invention, there is provided an impeller that is fixed to a rotating shaft of a rotor and is driven to rotate, an air guide having a plurality of stationary blades formed on the outer peripheral portion and the lower portion of the impeller, and a fan case made of resin and having a suction port A casing part that covers the impeller and the air guide, and a current plate part that has an inclined part that is located outside the suction port and extends from the suction port toward the outside of the machine. In this configuration, the fluid loss including air leakage between the rectifying plate portion and the casing portion can be reduced, and the effect of improving the performance of the electric blower can be exhibited.

  In the second invention, in particular, an annular convex portion having an inner diameter equal to that of the suction port is provided on the impeller side of the suction port of the first invention, and the convex portion is in sliding contact with the suction port of the impeller. In order to maintain the sealing performance at the same part, air leakage between the impeller and the resin fan case is reduced, and the effect of further improving the performance of the electric blower is demonstrated, and the current plate part, casing part, Since the seal part can be composed of one part, it also leads to a cost reduction effect.

  In the third invention, in particular, only the annular convex portion of the second invention is formed of a resin having a lower hardness than other portions, and the annular convex portion is shaved by an impeller that rotates at a high speed. The shape is easy to adapt, and is effective for further sealing.

In the fourth invention, in particular, on the upper surface of the stationary blade according to any one of the first to third inventions, a plurality of protrusions having a height equal to or greater than the thickness of the casing part are provided, and at positions facing the casing part, By providing a through hole in which the projection fits without a gap, and after assembling the projection into the through hole, the projecting portion of the projection from the outer surface of the casing is fixed by thermal welding or ultrasonic welding, There is no gap between the upper surface of the stationary vane of the air guide and the inner surface of the casing portion, the pressure recovery efficiency of the air guide is improved, and the performance of the electric blower can be improved.

  In a fifth aspect of the invention, in particular, on the upper surface of the stationary blade according to any one of the first to third aspects, a minute convex rib is provided in the height and width direction that is equal to or shorter than the blade length of the stationary blade. The rib is fixed to the inner surface of the casing part by ultrasonic welding, and there is no gap with the inner surface of the casing part over the entire section of the air guide vane, improving the pressure recovery efficiency in the air guide, and the electric blower The performance of the system can be improved.

  In the sixth aspect of the invention, in particular, on the surface of the casing part of the fourth or fifth aspect, the surface of the air guide that comes in contact with the stationary blade is provided with a shallow recess that is substantially the same shape as the stationary blade, and during assembly, The stationary blade is fitted into the recess and welded and fixed, and there is no gap with the inner surface of the casing part over the entire section of the stationary blade of the air guide, and the pressure recovery efficiency in the air guide is improved, The performance of the electric blower can be improved.

  In the seventh invention, in particular, the diameter of the rectifying plate part of any one of the first to sixth inventions is set larger than the diameter of the casing part, and the suction port is provided with a lattice part. When assembled, the air current can be collected from a wider area and rectified by the rectifying plate, and the suction performance of the vacuum cleaner can be improved.

  A vacuum cleaner according to an eighth aspect of the present invention uses the electric blower according to any one of claims 1 to 7, and can realize a vacuum cleaner having high suction performance.

  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)
FIG. 1 is a partial cross-sectional view of the electric blower according to the first embodiment of the present invention. In addition, about the same component as the conventional electric blower, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 1, the bracket 9 of the electric blower 1 in the present embodiment has a stator 2 and a rotor 3 that rotates at a high speed inside, and the impeller 4 is fixed to a rotating shaft 6 of the rotor 3. Rotate with 3

  An air guide 11 is provided outside the impeller 4 and plays a role of regulating the airflow discharged from the impeller 4 and recovering the pressure. Further, the outer sides of the impeller 4 and the air guide 11 are covered with a resinous fan case 5 to constitute the electric blower 1 as a whole.

  The fan case 5 maintains the airtightness of the upper part of the air guide 11, which is a conventional role, and is located outside the suction port 7 and the casing portion 8 that protects the impeller 4, and from the suction port 7 to the outside of the machine. It is comprised from the baffle plate part 10 provided with the inclination part 10a extended toward.

  These are composed of one part by resin molding. Furthermore, an annular convex portion 16 is formed in the suction port 7 toward the impeller 4 side, and is in contact with the tip of the suction port 4 a disposed in the center of the impeller 4. The annular convex portion 16 is made of a resin material that is softer than other portions of the fan case 5 and is formed of different materials (two colors).

  The operation of the electric blower in the present embodiment configured as described above is as follows.

When a voltage is applied to the electric blower 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. When the impeller 4 rotates at a high speed, the outside air is rectified by the rectifying plate portion 10, and then is guided to the inside of the impeller 4 through the suction port 7. The airflow is increased by the impeller 4 and discharged from the outer periphery.

  When the discharged air passes through the air guide 11, the pressure is converted and the static pressure increases. Thereafter, the airflow proceeds to the inside of the bracket 9, cools the stator 2, the rotor 3, and the like, and then is discharged from the exhaust port 12.

  In the conventional electric blower, the casing portion 8 is made of sheet metal, and the rectifying plate portion 10 is integrally molded with the casing portion 8 with resin to form the fan case 5. Therefore, the molding conditions and the shape of the casing portion 8 of the sheet metal are set. When a defect occurs, there is a problem that the integral molding is not successful and a gap is generated.

  However, in the electric blower according to the present embodiment, the fan case 5 is composed of one resin molded part from the rectifying plate portion 10 to the casing portion 8, so that such a gap does not occur, and air leakage or the like Therefore, the performance of the electric blower 1 is improved and stabilized.

  An annular convex portion 16 provided in the suction port 7 is in sliding contact with the impeller 4 to prevent air leakage at the same portion. Since the annular convex portion 16 is also integrally formed with the fan case 5, there is no leakage or the like generated from a joint or the like. Further, since the annular convex portion 16 is formed of two colors of resin material that is softer than the other portions, the resin is moderately scraped without locking when the impeller 4 rotates, The resin easily follows the rotation of the impeller 4 and air leakage is less likely to occur.

  As described above, according to the present embodiment, the rectifying plate portion 10 to the casing portion 8 are configured as one part, and the suction port 7 is provided with the annular convex portion 16 made of a soft resin, so that the impeller 4 Therefore, it is possible to prevent the air leakage in the fan case 5 of the electric blower 1, reduce the air loss, and realize the electric blower 1 having high air performance.

(Embodiment 2)
FIG. 2A is an enlarged cross-sectional view showing a main part of the electric blower before insertion of the fan case in Embodiment 2 of the present invention, and FIG. 2B shows the state of the electric blower after insertion of the fan case. It is a principal part expanded sectional view shown. In addition, about the same component as the electric blower in the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  2A shows a state immediately before the fan case 5 is inserted, and FIG. 2B shows a state where the fan case 5 is completely inserted.

  As shown in FIG. 2A, the electric blower in the present embodiment is provided with a plurality of protrusions 18 at the upper portion of the stationary blade 17 of the air guide 11 whose height is slightly higher than the thickness of the fan case 5. Yes. Further, a through hole 19 having substantially the same diameter as the protrusion 18 is provided at a position facing the protrusion 18 of the fan case 5. When the fan case 5 is inserted, the protrusion 18 is received in the through hole 19, and the head of the protrusion 18 protruding from the fan case 5 is crushed by heat welding or ultrasonic welding, as shown in FIG. It becomes a state.

The operation of the electric blower in the present embodiment configured as described above is as follows. When the electric blower 1 is operated, the rotor 3 rotates at a 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, the outside air is rectified by the rectifying plate portion 10, and then is guided to the inside of the impeller 4 through the suction port 7. The airflow is increased by the impeller 4 and discharged from the outer periphery. When the discharged air passes through the air guide 11, the pressure is converted and the static pressure increases.

  At this time, in the configuration of the conventional electric blower, there is a case where a gap is generated between the stationary blade 17 due to incomplete insertion of the fan case 5 and sufficient pressure recovery cannot be obtained. According to the above, since the stationary blade 17 and the fan case 5 are completely fixed by welding, there is no gap, the pressure conversion loss is reduced, and a higher static pressure is obtained.

  Thus, according to this Embodiment, since the clearance gap between the stationary blade 17 of the air guide 11 and the fan case 5 is hard to generate | occur | produce, the electric blower 1 with high air performance is realizable.

(Embodiment 3)
FIG. 3A is an enlarged cross-sectional view showing a main part of the electric blower before insertion of the fan case in Embodiment 3 of the present invention, and FIG. 3B shows the state of the electric blower after insertion of the fan case. It is a principal part expanded sectional view shown. In addition, the same code | symbol is attached | subjected about the same component as the electric blower in the said 1st, 2nd embodiment, and the description is abbreviate | omitted.

  3A shows a state immediately before the fan case 5 is inserted, and FIG. 3B shows a state where the fan case 5 is completely inserted.

  In the electric blower according to the present embodiment, as shown in FIG. 3A, minute convex ribs 23 are extended on the stationary blades 17 of the air guide 11 in the height-width direction. The length of the minute convex rib 23 is almost equal to the blade length of the stationary blade 17. Further, a recess 24 having a thickness equal to or smaller than the thickness of the fan case 5 is formed at a position where the stationary blade 17 of the fan case 5 contacts. The recess 24 has substantially the same shape as the blade shape when the stationary blade 17 is viewed from the upper surface (suction port side), and is formed at a certain depth. When the fan case 5 is inserted, the end portion of the stationary blade 17 is accommodated in the concave portion 24, and the minute convex ribs 23 are crushed by ultrasonic welding, resulting in a state as shown in FIG.

  The operation of the electric blower in the present embodiment configured as described above is as follows. When the electric blower 1 is operated, the rotor 3 rotates at a 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, the outside air is rectified by the rectifying plate portion 10, and then is guided to the inside of the impeller 4 through the suction port 7. The airflow is increased by the impeller 4 and discharged from the outer periphery.

  When the discharged air passes through the air guide 11, the pressure is converted and the static pressure increases. At this time, in the configuration of the conventional electric blower, there is a case where a gap is generated between the stationary blade 17 due to incomplete insertion of the fan case 5 and sufficient pressure recovery cannot be obtained. According to the above, the stationary blade 17 and the fan case 5 are completely fixed by ultrasonic welding, no gap is generated, the pressure conversion loss is reduced, and a higher static pressure is obtained.

  Thus, according to this Embodiment, since the clearance gap between the stationary blade 17 of the air guide 11 and the fan case 5 is hard to generate | occur | produce, the electric blower 1 with high air performance is realizable.

(Embodiment 4)
FIG. 4 is a partial cross-sectional view of the electric vacuum cleaner according to Embodiment 4 of the present invention. In addition, the same code | symbol is attached | subjected about the same component as the electric blower in the said Embodiment 1-3, and the description is abbreviate | omitted.

FIG. 4 shows a cross-sectional view in which the electric blower 1 according to any one of the first to third embodiments is stored in the cleaner body 14. The fan case 5 of the electric blower 1 is made such that the diameter of the rectifying plate portion 10 is larger than the diameter of the casing portion 8. A lattice portion 25 is formed integrally with the suction port 7 of the fan case 5 by resin molding.

  In the electric blower 1 having such a feature, a soft member 15 is attached to a recessed portion between the rectifying plate portion 10 and the casing portion 8, and the entire electric blower 1 is covered with a motor case 13. It is fixed to the main body 14.

  In the case of a conventional vacuum cleaner, a partition wall 29 having a lattice 28 separating the dust collection chamber 26 and the electric blower 1 is present in front of the electric blower 1. In this embodiment, a fan case is provided. Since the lattice part 25 is provided in 5 itself, it is not necessary to comprise the partition 29 in the cleaner body 14 side.

  Further, the rectifying plate portion 10 larger than the casing portion 8 occupies from the lower portion to the upper portion of the cleaner body 14, and the airflow flowing through the dust collection chamber 26 is collected over a wide area, and the rectifying plate portion 10 Since rectification is performed, the turbulence of the airflow is eliminated, and as a result, the loss of fluid is reduced and the suction performance of the vacuum cleaner is improved.

  As described above, according to the present embodiment, the airflow plate can be rectified over a wide range by setting the flow straightening plate portion 10 larger than the casing portion 8 and providing the lattice portion 25 in the suction port 7. A high vacuum cleaner can be realized.

  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.

DESCRIPTION OF SYMBOLS 1 Electric blower 2 Stator 3 Rotor 4 Impeller 5 Fan case 6 Rotating shaft 7 Suction port 8 Casing part 9 Bracket 10 Current plate part 10a Inclined part 11 Air guide 12 Exhaust port 13 Motor case 14 Vacuum cleaner main body 15 Soft member 16 Convex part 17 Stator blade 18 Protrusion 19 Through hole 20 Resin guide 22 Intake guide portion 23 Convex rib 24 Concave portion 25 Grid portion 26 Dust collection chamber

Claims (8)

The fan case comprising: an impeller fixed to a rotating shaft of a rotor and driven to rotate; an air guide having a plurality of stationary blades formed on an outer peripheral portion and a lower portion of the impeller; and a fan case made of resin and having a suction port. And a casing portion that covers the impeller and the air guide and a rectifying plate portion that is located outside the suction port and has an inclined portion that extends from the suction port toward the outside of the machine is integrally configured without a joint. Electric blower. An annular convex portion having an inner diameter equal to that of the suction port is provided on the impeller side of the suction port, and the convex portion is in sliding contact with the suction port of the impeller, and maintains a sealing property at the same portion. The electric blower according to claim 1. The electric blower according to claim 2, wherein only the annular convex portion is formed of a resin having a lower hardness than the other portions. A plurality of protrusions whose height is equal to or greater than the thickness of the casing part are provided on the upper surface of the stationary blade, and a through-hole in which the protrusions are accommodated without gaps is provided at a position opposite to that of the casing part. The electric blower according to any one of claims 1 to 3, wherein a protrusion of the protrusion from the outer surface of the casing is fixed by thermal welding or ultrasonic welding after being inserted into the through hole. 4. The convex surface of the stationary blade is provided with a minute convex rib that is shorter than the blade length of the stationary blade in both the height and width directions, and is fixed to the inner surface of the casing portion by ultrasonic welding during assembly. The electric blower of any one of Claims. 5. A shallow concave portion having substantially the same shape as that of the stationary blade is provided on a surface of the casing portion on which the stationary blade of the air guide contacts, and the stationary blade is fitted into the concave portion and welded and fixed during assembly. 5. The electric blower according to 5. The electric blower according to any one of claims 1 to 6, wherein a diameter of the rectifying plate portion is set larger than a diameter of the casing portion, and a lattice portion is provided in the suction port. The vacuum cleaner using the electric blower of any one of Claims 1-7.

Images