JP4952061B2 - Electric blower and electric vacuum cleaner using the same - Google Patents

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 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 6 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 section 20 having a plurality of passages, the flow changing section 21 for guiding the flow to the back surface of the air guide 17, and the return path 22. Reference numeral 18 denotes a fan case having a plurality of slits 25 on the outer periphery thereof, and is attached 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 then through the return path 22 and 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 that faces 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 between the area S2 of the fan case opening when the position is not located within the bracket opening of the load-side bracket, S1 <with relation S2 is established, the airflow generated by the impeller one Part passes through the diffuser passage of the air guide, and the position of the end of the return passage is within the range of the bracket opening of the load side bracket, and the diffuser passage of the air guide And the position of the end of the return passage is not within the range of the bracket opening of the load side bracket. Those from the fan case opening in the mix was characterized by being released to the atmosphere, contributing passage to cool the motor by reducing the opening of the fan case, with make cooling air, also suppresses noise, motor High efficiency can be maintained by enlarging the opening of the passage which does not contribute much to cooling.

  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 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 a part of the airflow generated by the impeller passes through the diffuser passage of the air guide. When the position of the end of the return path is within the range of the bracket opening of the load side bracket, the position of the end of the return path passes through the fan case opening and the diffuser path of the air guide. Outside the fan case opening when it is not within the range of the bracket opening of the load side bracket Which it was characterized to be released into contributes passage to cool the motor by reducing the opening of the fan case, with make cooling air, noise is also suppressed, the opening of the passageway does not contribute significantly to the cooling By increasing the size, high efficiency can be maintained .

The second invention is a vacuum cleaner provided with the electric blower of the first invention, maintaining a high suction work rate, improving reliability and reducing noise, and having high usability. Can provide.

  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 part as a prior art example, and the detailed description is abbreviate | omitted.

  FIG. 1 is a partial cross-sectional view of the electric blower according to the present embodiment, and FIG. 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 slits 25 correspond to the positions 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

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 (2)

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 outer periphery of the fan case that includes an air guide that forms a return passage on the back surface that returns the air flow and leads to the air guide center portion on the back surface, and a fan case that covers the impeller and the air guide, and that faces 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. In this case, a relationship of S1 <S2 is established with the area S2 of the fan case opening, and part of the airflow generated by the impeller passes through the diffuser passage of the air guide and passes through the return passage. When the end position is within the range of the bracket opening of the load side bracket, it passes through the fan case opening and the diffuser passage of the air guide, and the end position of the return path is the end of the load side bracket. When it is not located within the bracket opening, it is discharged from the fan case opening to the outside air. Electric blower, characterized in that. A vacuum cleaner comprising the electric blower according to claim 1 .

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