JP2007315346A - Motor driven blower and vacuum cleaner using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor driven blower having high efficiency, improved motor reliability and reduced noises. <P>SOLUTION: The motor driven blower comprises an air guide 17 provided on the outer periphery of an impeller 16 and having a diffuser passage 20 between stationary blades provided on the surface and a return passage 22 for returning an air flow from a flow change portion (the terminal end of the diffuser passage) 21 and guiding it to the central portion of the air guide on the reverse side, and a fan case 18 covering the impeller 16 and the air guide 17. On the outer periphery side face of the fan case 18 opposed to the terminal end of the diffuser passage 20, a plurality of slits (fan case opening portions) 25, 26 are provided for discharging the air flow from the diffuser passage 20. A relationship of S1<S2 is established between an area S1 of the slit 25 in the case that the terminal end of the return passage 22 is located in a range of a bracket opening portion of a load side bracket 11 and an area S2 of the slit 26 in the case that it is not located in the rage. This results in improved motor reliability and reduced noises while maintaining the efficiency. <P>COPYRIGHT: (C)2008,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 vacuum cleaners used by the prior art is demonstrated using FIG.

  2 is a stator formed by applying field windings (omitted) to the field core 3, 5 is armature windings (schematic) 8 applied to the armature core 7 passed through the shaft 6, and the commutator 9 is coaxial. It is a rotor that is disposed in the shaft and is rotatably fixed by bearings 10 provided at both ends of the shaft 6. The stator 2 and the rotor 5 are fixed to the load-side bracket 11 and the anti-load-side bracket 12, and a motor 15 is formed by inserting a pair of carbon brushes 13 into the anti-load-side bracket 12 via the deformed tube 14. . Reference numeral 19 denotes an exhaust port. Further, the shaft 6 of the output shaft is provided with an impeller 16, and an air guide 17 that forms a ventilation path is disposed on the outer peripheral portion of the impeller 16, and the air guide 17 is configured by between adjacent stationary blades 26 on the surface. The diffuser unit 20 has a plurality of passages, the flow changing unit 21 guides the flow to the back surface of the air guide 17, and the return passage 22. Reference numeral 18 denotes a fan case having a plurality of slits 25 on the outer periphery thereof, and is attached so as to cover the impeller 16 and the air guide 17 to form the electric blower 1. Reference numeral 24 denotes an intake port.

In the above configuration, when power is supplied, the current conducted through the field winding is transmitted to the commutator 9 through the carbon brush 13, and the magnetic flux generated in the field core 3 and the current through the armature winding 8 are A force is generated between them, and the rotor 5 rotates. Next, when the rotor 5 is rotated, the impeller 16 fixed to the shaft 6 of the rotor 5 is rotated, and the air in the impeller 16 is accelerated. Most of the increased air is diffused in the air guide 17. Passing through the unit 20, the vehicle is decelerated and enters the flow changing unit 21, the direction is changed by 180 degrees, and through the return path 22, it is guided to the motor 15. Thereafter, the rotor 5, the stator 2, and the carbon brush 13 are cooled and discharged from the exhaust port 19 of the non-load side bracket 12. However, a part of the air is linearly discharged from the plurality of slits 25 on the outer periphery of the fan case 18 and functions to increase the blowing efficiency of the electric blower 1. Thereby, it was going to improve the efficiency of the electric blower 1 (for example, refer patent document 1).
Japanese Utility Model Publication No. 61-47964

  However, in the conventional configuration, although the efficiency of the electric blower 1 is improved, the amount of air used for cooling the motor is reduced, the temperature of the motor is increased, and the durability and reliability of the brush life and the like are not limited. It was something that gave.

  Further, since the air accelerated by the impeller 16 is discharged as it is, noise such as interference sound generated between the impeller 16 and the air guide 17 is also released as it is, and the noise is higher than the conventional one.

  An object of the present invention is to solve the above problems, and to provide an electric blower that maintains high efficiency, improves motor durability, and reduces noise, and a vacuum cleaner equipped with the electric blower.

  In order to solve the above-described conventional problems, an electric blower of the present invention includes a bottomed substantially cylindrical anti-load side bracket having an exhaust port, and a motor member such as a rotor and a stator in a load side bracket having a bracket opening. An impeller that is rotationally driven by the electric motor, and provided on the outer periphery of the impeller, has a plurality of stationary blades on the surface, and airflow from the impeller is between adjacent stationary blades. An air guide that forms a plurality of diffuser passages passing therethrough, returns airflow at the end of the diffuser passage, and forms a return passage on the back surface that leads to the air guide center portion on the back surface, and a fan that covers the impeller and the air guide A part of the airflow that has passed through the diffuser passage is discharged to the outer peripheral side surface of the fan case facing the end of the diffuser passage. A plurality of fan case openings, and an area S1 of the fan case opening when the position of the end of the return path is within the range of the bracket opening of the load side bracket, and the end of the return path A relationship of S1 <S2 is established between the fan case opening area S2 when the position is not within the range of the bracket opening portion of the load side bracket, The passage that contributes to cooling reduces the fan case opening, earns cooling air, suppresses noise, and increases the opening of the passage that does not contribute much to the cooling of the motor, thereby maintaining high efficiency. it can.

  ADVANTAGE OF THE INVENTION According to this invention, while maintaining high efficiency, the improvement of the reliability of a motor and the electric blower which reduced the noise, and the vacuum cleaner carrying it can be provided.

  A first invention includes a bottomed substantially cylindrical anti-load side bracket having an exhaust port, an electric motor configured by arranging electric members such as a rotor and a stator in a load side bracket having a bracket opening, An impeller that is rotationally driven by the electric motor, and provided on the outer periphery of the impeller, having a plurality of stationary blades on the surface, forming a plurality of diffuser passages through which the airflow from the impeller passes between adjacent stationary blades, and An air guide having a return passage formed on the back surface for returning the airflow at the end portion of the diffuser passage and leading to the center of the air guide on the back surface; and a fan case covering the impeller and the air guide; and an end of the diffuser passage; Provided on the outer peripheral side surface of the opposing fan case are a plurality of fan case openings for discharging part of the airflow that has passed through the diffuser passage, The area S1 of the fan case opening when the position of the end of the return path is within the range of the bracket opening of the load side bracket, and the position of the end of the return path is the position of the bracket opening of the load side bracket. A relationship of S1 <S2 is established with the area S2 of the fan case opening when not located within the range, and the passage contributing to cooling of the electric motor has an opening of the fan case. High efficiency can be maintained by reducing the size, earning cooling air, suppressing noise, and increasing the opening size of the passage that does not contribute much to cooling.

  In the second invention, the area S1 of the fan case opening of the first invention is characterized in that the relationship of S1 = 0 is established, and further, cooling of the motor and noise can be reduced. It is.

  The third aspect of the invention is a vacuum cleaner including the electric blower of the first or second aspect of the invention, maintains a high suction work rate, improves reliability and reduces noise, and has high usability. Can provide a vacuum cleaner.

  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. The same parts as those in the conventional example are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 1 is a partial cross-sectional view of the electric blower of the present embodiment, FIG. 2 is a plan view of the electric blower as viewed from the intake port side, and a fan case and an impeller are omitted. Reference numerals 25 and 26 denote slits (fan case openings) provided on the outer periphery of the fan case 18, which have the same circumferential width, but have different axial heights. Is set large. In FIG. 2, the ribs indicated by broken lines are return passage guide vanes on the back surface of the air guide 17 that form the return passage 22, and their ends extend in the direction of the shaft 6 of the electric blower 1. On the extension, there is a bracket opening 27 (oblique line) of the load side bracket 11. A to H represent passages (for a half circumference), and the slits 26 of the fan case 18 in FIG. 1 correspond to the passages A to C, and the positions of the slits 25 correspond to D to H. Yes. The same applies to the remaining half circle.

  The operation in the above configuration will be described. When electric power is supplied, the airflow generated by the impeller 16 due to the rotation of the rotor 5 passes through the diffuser portion (diffuser passage) 20 of the air guide 17 as in the conventional example. Is discharged from the slits 25 and 26 on the outer periphery of the fan case 18 to the outside air, and the remaining air flows through the motor 15 via the flow changing portion (the end of the diffuser passage) 21 and the return passage 22, and the rotor 5, the stator 2, The carbon brush 13 is cooled and discharged from the exhaust port 19 of the non-load side bracket 12. At this time, since there is no bracket opening 27 of the load side bracket 11 on the extension of the paths A to C, the airflow passing through the return path 22 hits the wall of the load side bracket 11 and bends to form a gap or the like. , And flows into the opening 11 of the load side bracket, so that the pressure loss is increased.

  However, since the opening area of the slit 26 of the fan case 18 is set large for the passages A to C, it easily flows from the same portion to the outside air, and the pressure loss at the end of the return passage 22 can be suppressed as much as possible. it can. In addition, the airflow that has passed through the passages D to H has the bracket opening 27 of the load side bracket 11 on its extension, so that it easily flows into the motor 15 and has little loss.

  Therefore, even if the area of the slit 25 of the fan case 18 is set to be small, there is little loss, and the air flowing into the motor 15 increases accordingly, and the inside of the motor 15 is efficiently cooled, and from the slit 25 of the fan case 18. The noise from the impeller that is released linearly can also be suppressed.

  As described above, according to the present embodiment, the phenomenon in which the flow of the return passage varies depending on the shape of the load-side bracket 11 can be efficiently achieved by adjusting the areas of the slits 25 and 26 provided in the fan case 18. The motor is divided into a part that contributes to the motor and a part that contributes to the cooling of the motor, and the overall efficiency is improved, so that the durability and reliability of the motor are improved while maintaining high efficiency, and noise is also taken into account. A blower is 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.

The fragmentary sectional view of the electric blower which shows the 1st Embodiment of this invention Top view of the electric blower with the fan case and impeller removed Partial sectional view showing a conventional electric blower

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric blower 2 Stator 5 Rotor 11 Load side bracket 12 Anti-load side bracket 13 Carbon brush 15 Motor (electric motor)
16 Impeller 17 Air guide 18 Fan case 19 Exhaust port 20 Diffuser section (diffuser passage)
21 Flow changing part (end part of diffuser passage)
22 Return passage 24 Air intake 25 Slit (fan case opening)
26 Slit (fan case opening)
27 Bracket opening

Claims (3)

An anti-load side bracket having a bottomed substantially cylindrical shape having an exhaust port, an electric motor having a motor member such as a rotor and a stator disposed in a load side bracket having a bracket opening, and rotationally driven by the electric motor. An impeller provided on the outer periphery of the impeller, and having a plurality of stationary blades on a surface thereof, forming a plurality of diffuser passages through which airflow from the impeller passes between adjacent stationary blades, and at a terminal portion of the diffuser passage An air guide having a return passage formed on the back surface for returning the airflow and leading to the center of the air guide on the back surface, and a fan case covering the impeller and the air guide, and an outer periphery of the fan case facing the end of the diffuser passage Provided on the side surface with a plurality of fan case openings for discharging part of the airflow that has passed through the diffuser passage, and the end of the return passage The area S1 of the fan case opening when the position is within the range of the bracket opening of the load side bracket and the position of the end of the return path are not within the range of the bracket opening of the load side bracket. An electric blower characterized in that a relationship of S1 <S2 is established between the fan case opening area S2 in the case. The electric blower according to claim 1, wherein the area S1 of the fan case opening satisfies the relationship of S1 = 0. The vacuum cleaner provided with the electric blower of Claim 1 or 2.

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