JP5048701B2 - Electric blower and electric vacuum cleaner - Google Patents

Description

  The present invention relates to an electric blower and a vacuum cleaner using the electric blower, for example.

An electric blower used for an electric vacuum cleaner or the like drives a motor to rotate a rotating fan, and sucks air from an intake port of the rotating fan to generate an air flow. The electric blower boosts and accelerates the airflow, and then decelerates and recovers static pressure at the diffuser portion provided on the outer peripheral portion of the rotating fan. In order to cool the motor, the electric blower guides the airflow that has been decelerated and recovered by static pressure to the motor side. In order to guide the airflow from the diffuser part to the motor side, it is necessary to change the direction of the airflow spreading radially outward to the radially inner side. At this time, bending loss occurs because the direction of the airflow is suddenly changed. This bending loss hinders improving the air blowing efficiency of the electric blower.
In Patent Documents 1 and 2, there is a description of an electric blower provided with a rectifying unit that fills a corner inside a portion of a fan cover that covers a stationary blade and an outer periphery of the stationary blade. In this electric blower, the rectification unit promotes the bending of the air current and reduces the bending loss.

JP 2005-226608 A JP 2006-250016 A

In the electric blowers described in Patent Documents 1 and 2, although the effect of reducing the bending loss is obtained, the bending loss still hinders the improvement of the blowing efficiency of the electric blower. Therefore, it is necessary to further reduce the bending loss.
An object of the present invention is to reduce bending loss when the direction of airflow is bent from the diffuser portion to the motor side.

The electric blower according to the present invention is, for example,
A motor comprising: a rotor held rotatably; a commutator that switches a direction of current flow in the rotor; a stator that is fixed to the outer periphery of the rotor through a gap; and a shaft that is a rotating shaft; ,
A rotating fan attached to the shaft of the motor;
A fan cover covering the outer periphery of the rotating fan;
A diffuser portion that rectifies the airflow generated by the rotating fan is formed between the fan cover and a return air passage that deflects the airflow that has passed through the diffuser portion toward the rotor included in the motor. And an air guide formed between
The motor includes the commutator on the rotating fan side of the rotor,
The return air passage is connected to a hole of a motor cover provided on the outer periphery of the stator.

  The electric blower according to the present invention includes a commutator on the rotating fan side of the rotor. Thereby, since the distance between a rotary fan and a rotor can be lengthened, the direction of airflow can be bent gently. Therefore, bending loss can be reduced and the efficiency of the electric blower is improved.

Sectional drawing of the electric blower 1 which concerns on Embodiment 1. FIG. Sectional drawing of the electric blower 1 which concerns on Embodiment 2. FIG. FIG. 3 is an enlarged view of the vicinity of the outer periphery of a rotary fan 9 in FIG. 2. Sectional drawing of the electric blower 1 which concerns on Embodiment 3. FIG. The whole figure of the vacuum cleaner 20 which concerns on Embodiment 4. FIG.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view of the electric blower 1 according to the first embodiment. In addition, the arrow shown in FIG. 1 shows a rough air flow (meridional surface flow).
The electric blower 1 includes a motor 2, a rotary fan 9, a fan cover 10, and an air guide 11.

The motor 2 includes a shaft 3, a rotor 4, a stator 5, a commutator 6, a brush 7, and a motor cover 8.
The shaft 3 is an output shaft (rotation shaft) of the motor 2 and is rotatably held. A rotor 4 and a commutator 6 are fixed to the shaft 3. In particular, the commutator 6 is fixed to the rotary fan 9 side of the rotor 4. That is, the commutator 6 is provided between the rotor 4 and the rotary fan 9.
The rotor 4 includes a rotor core 4a and a rotor coil 4b wound around the rotor core 4a.
The stator 5 is arranged on the outer periphery of the rotor 4 with a gap from the rotor 4. The stator 5 has a stator core 5a and a stator coil 5b wound around the stator core.
The commutator 6 has a function of switching the current direction of the rotor coil 4b.
The brush 7 is in contact with the commutator 6 and is provided on the outer periphery of the commutator 6. The brush 7 supplies current to the rotor 4 through the commutator 6 and extracts current from the rotor 4.
That is, the commutator 6 and the brush 7 switch the current flowing through the rotor coil 4b according to the rotational phase, and keep the rotational moment in a certain direction.

The rotary fan 9 is attached to the shaft 3. The rotary fan 9 includes a rotary side plate 9a, a rotary main plate 9b, and a rotary blade 9c.
The rotation side plate 9a is formed with a fan air inlet 9d at the center. The rotation side plate 9a is formed to be inclined toward the rotation main plate 9b side from the fan intake port 9d side toward the outer peripheral portion.
The rotation main plate 9b is provided on the motor 2 side with respect to the rotation side plate 9a so as to face the rotation side plate 9a. The rotation main plate 9b is formed in a flat plate shape and has an attachment portion 9e attached to the shaft 3 at the center.
A plurality of rotary blades 9c are provided between the rotary side plate 9a and the rotary main plate 9b. The rotary blade 9c rotates as the shaft 3 rotates. In FIG. 1, the rotary blade 9c is indicated by a vertical line connecting the rotary side plate 9a and the rotary main plate 9b.

The fan cover 10 includes an upper fan cover 10a and a lower fan cover 10b. The fan cover 10 covers the outer peripheral portions of the rotary fan 9 and the air guide 11 by the upper fan cover 10a and the lower fan cover 10b. The fan cover 10 prevents the airflow generated when the rotary fan 9 sucks air from flowing to the outside.
The air guide 11 forms a diffuser portion 12 (shaded portion indicated by reference numeral 12 in FIG. 1) and a return air passage 14 (shaded portion indicated by reference numeral 14 in FIG. 1) between the fan cover 10.
The diffuser portion 12 is formed on the outer periphery of the rotary fan 9 by the upper fan cover 10 a and the air guide 11. The diffuser unit 12 is provided with a plurality of stationary blades 13 and decelerates the airflow discharged by the rotary fan 9 and recovers the static pressure to rectify. In FIG. 1, the stationary blade 13 is indicated by a vertical line connecting the fan cover 10 and the air guide 11.
The return air passage 14 changes the airflow that has passed through the diffuser portion 12 toward the inside of the electric blower 1 and guides it to the hole 8 a provided on the side surface of the motor cover 8. That is, the return air passage 14 deflects the airflow that flows from the rotary fan 9 to the diffuser portion 12 toward the outside of the electric blower 1 toward the inside of the electric blower 1. The return air passage 14 guides the airflow from the hole 8 a of the motor cover 8 to the inside of the motor 2. In particular, the return air passage 14 guides the airflow to the vicinity of the rotor 4 and the stator 5.

Next, the operation of the electric blower 1 will be described.
When electric power is supplied to the electric blower 1, a current flows through the stator coil 5b. Then, magnetic flux is generated in the stator 5. Further, current is conducted from the stator coil 5 b to the commutator 6 through the brush 7. And an electric current flows into the rotor coil 4b. Then, magnetic flux is generated in the rotor 4.
A force is generated between the rotor 4 and the stator 5 by the magnetic flux generated by the rotor 4 and the stator 5. By this force, the rotor 4 rotates. As the rotor 4 rotates, the shaft 3 rotates. As the shaft 3 rotates, the rotary blade 9c of the rotary fan 9 attached to the shaft 3 rotates.

Next, the airflow in the electric blower 1 will be described.
Due to the operation of the electric blower 1 described above, the rotary blade 9c of the rotary fan 9 rotates. Then, the air entering from the fan air inlet 9d is increased in pressure and increased in speed, and turns into an air flow toward the outside of the electric blower 1 while turning (1). The airflow discharged from the rotary fan 9 flows into the diffuser section 12 (2). The airflow flowing into the diffuser unit 12 is decelerated and recovered with static pressure. Then, the airflow decelerated and recovered by static pressure in the diffuser portion 12 passes through the return air passage 14 (3) and is guided into the motor 2 from the hole 8a of the motor cover 8 provided on the outer periphery of the stator 5 (4). . The airflow guided into the motor 2 passes through the vicinity of the rotor 4 and the stator 5 and is discharged to the outside of the motor 2 from the hole 8b of the motor cover 8 provided on the side opposite to the rotary fan 9 (5). . When the airflow flows from the hole 8a to the hole 8b, the motor 2 is cooled.

Here, by disposing the commutator 6 between the rotor 4 (and the stator 5) and the rotary fan 9, the distance between the rotor 4 (and the stator 5) and the rotary fan 9 becomes long. Therefore, the distance from the diffuser part 12 to the hole 8a of the motor cover 8 provided near the rotor 4 (and the stator 5) becomes long. That is, the distance of the return air passage 14 becomes long. Since the distance of the return air passage 14 is long, the return air passage 14 can be gently bent. If the return air passage 14 bends gently, the air current bend in the return air passage 14 also becomes gentle. Therefore, bending loss in the return air passage 14 can be reduced. As a result, the efficiency of the electric blower 1 can be increased.
That is, the electric blower 1 according to the first embodiment can reduce the bending loss in the return air passage 14 by disposing the commutator 6 between the rotor 4 (and the stator 5) and the rotary fan 9. it can.
In particular, the commutator 6 is disposed between the rotor 4 and the rotary fan 9 instead of simply widening the gap between the rotor 4 and the rotary fan 9. Therefore, the efficiency of the electric blower 1 can be improved without increasing the size of the electric blower 1.

Further, a portion of the air guide 11 that forms the diffuser portion 12 (thick line portion 11 a in FIG. 1) is inclined toward the motor 2 toward the outer peripheral portion of the electric blower 1. In particular, the thick line portion 11a is formed in a smooth curve that is inclined toward the motor 2 side toward the outer peripheral portion of the electric blower 1. Therefore, the bending of the airflow in the diffuser part 12 can be made gentle. Therefore, bending loss at the diffuser portion 12 can be reduced.
Similarly, the return air passage 14 is formed in a smooth curve from the diffuser portion 12 side toward the motor 2 side. Therefore, the bending of the airflow in the return air passage 14 can be made gentle.

  Further, the hole 8a of the motor cover 8 to which the return air passage 14 is connected is provided in the outer peripheral portion of the stator 5 that needs the most cooling. Therefore, the motor 2 can be efficiently cooled.

Further, in the electric blower 1 shown in FIG. 1, all the airflow that has passed through the diffuser portion 12 changes its direction toward the motor 2 through the return air passage 14. For this reason, it is difficult to transmit the aerodynamic sound generated by the discharge of the airflow from the rotary fan 9 or the collision of the airflow to the stationary blade 13 to the outside. Therefore, the noise of the electric blower 1 can be reduced.
In addition, a hole may be provided in the fan cover 10 on the outer peripheral side of the stationary blade 13 so that airflow exceeding the flow rate necessary for cooling the motor 2 can escape to the outside of the fan cover 10. In this case, noise increases. However, the bending loss at the time of bending the direction of the airflow in the return air passage 14 can be further reduced. Therefore, the efficiency of the electric blower 1 can be further increased.

  That is, the electric blower 1 according to Embodiment 1 includes a shaft 3 that is an output shaft that is rotatably held, a core 4a that is fixed to the shaft 3, and a rotor 4 that has a coil 4b wound around the core 4a. A commutator 6 that is fixed to the shaft 3 and has an action of switching the current direction of the coil 4b of the rotor 4, a brush 7 that is in contact with the commutator 6 and supplies current to the commutator 6 or extracts current from the commutator 6, a rotor 4, a motor 2 having a core 5 a disposed on the outer periphery of the motor 4 and a stator 5 having a coil 5 b wound around the core 5 a, a rotating fan 9 attached to the shaft 3, and a rotating fan 9 having a stationary blade 13. A diffuser unit 12 that decelerates and restores static pressure of the discharged air flow, a return air passage 14 that changes the direction of the air flow that has passed through the diffuser unit 12 toward the inner peripheral side, the rotating fan 9 and the diffuser And a fan cover 10 enclosing the Yuza 12, characterized in that a commutator 6 between the rotary fan 9 and the stator 5.

  Further, the motor 2 side surface (air guide 11) constituting the air passage of the diffuser portion 12 is inclined to the motor 2 side as it goes to the outer periphery.

Embodiment 2. FIG.
FIG. 2 is a cross-sectional view of the electric blower 1 according to the second embodiment. FIG. 3 is an enlarged view of the vicinity of the outer periphery of the rotary fan 9 of FIG. The arrows shown in FIGS. 2 and 3 indicate a rough air flow (meridional surface flow).
The electric blower 1 shown in FIGS. 2 and 3 is basically the same as the electric blower 1 shown in FIG. However, it differs in that the outer peripheral end of the rotating main plate 9b is warped on the motor 2 side (lower side in FIGS. 2 and 3). Further, the air guide 11 is provided with a recess so that the rotation main plate 9b is not in contact with the air guide 11 by warping the rotation main plate 9b.

Based on FIG. 3, the airflow in the vicinity of the outer periphery of the rotary fan 9 will be described.
As shown by arrows in FIG. 3, the airflow near the outer periphery of the rotary fan 9 forms a circulating vortex on the rotary main plate 9b side. Therefore, the flow is biased toward the rotation side plate 9a. That is, the airflow toward the diffuser portion 12 has a higher flow velocity on the fan cover 10 side than the flow velocity on the air guide 11 side.
In the electric blower 1 according to Embodiment 2, the outer peripheral end of the rotary main plate 9b is warped toward the motor 2 side. Therefore, in the electric blower 1 according to the second embodiment, the air passage width W1 at the outer peripheral portion (outer peripheral end) of the rotary fan 9 is wider than that of the electric blower 1 according to the first embodiment. Therefore, the ratio of the circulating vortex occupying the air path at the outer peripheral portion (outer peripheral end) of the rotary fan 9 can be reduced.
Thereby, the air path through which an airflow passes is ensured. Therefore, it is possible to suppress a partial increase in the flow velocity discharged from the rotary fan 9 and passing through the diffuser portion 12. As a result, bending loss in the return air passage 14 can be reduced. Further, since the wind speed flowing into the diffuser portion 12 is made uniform, the collision loss to the stationary blade 13 is reduced. Therefore, the efficiency of the static pressure recovery in the diffuser part 12 can be increased.

  That is, the electric blower 1 according to Embodiment 2 can reduce the bending loss when the direction of the airflow that has passed through the diffuser portion 12 is changed to the motor 2 side by curving the outer peripheral end of the rotary main plate 9b to the motor 2 side. . As a result, the efficiency of the electric blower 1 can be improved.

  That is, the electric blower 1 according to the second embodiment includes a shaft 3 that is an output shaft that is rotatably held, a rotor 4 having a core 4a fixed to the shaft 3 and a coil 4b wound around the core 4a, A commutator 6 that is fixed to the shaft 3 and has an action of switching the current direction of the coil 4b of the rotor 4, a brush 7 that is in contact with the commutator 6 and supplies current to the commutator 6 or extracts current from the commutator 6, a rotor 4, a motor 2 having a core 5 a disposed on the outer periphery of the motor 4 and a stator 5 having a coil 5 b wound around the core 5 a, a rotating fan 9 attached to the shaft 3, and a rotating fan 9 having a stationary blade 13. A diffuser unit 12 that decelerates and restores static pressure of the discharged air flow, a return air passage 14 that changes the direction of the air flow that has passed through the diffuser unit 12 toward the inner peripheral side, the rotating fan 9 and the diffuser And a fan cover 10 enclosing the Yuza unit 12, the motor 2 is arranged to rotate main plate 9b side of the rotating fan 9, the outer peripheral portion of the rotating main plate 9b, characterized in that the warped motor 2 side.

Embodiment 3 FIG.
FIG. 4 is a cross-sectional view of the electric blower 1 according to the third embodiment. The arrows shown in FIG. 4 indicate a rough air flow (meridional surface flow).
The electric blower 1 shown in FIG. 4 is basically the same as the electric blower 1 shown in FIG. However, the difference is that the rotating main plate 9b is inclined to the motor 2 side (the lower side of FIGS. 2 and 3). In particular, the rotating main plate 9b is a plane in a direction perpendicular to the axial direction of the shaft 3 at the mounting portion 9e in the vicinity of the shaft 3 (around the shaft 3). However, the outside of the rotary main plate 9b near the shaft 3 is inclined toward the motor 2 toward the outer peripheral portion. That is, the rotary main plate 9b is formed so as to be closer to the motor 2 as it goes outward.

  Since the rotary main plate 9b is inclined toward the motor 2, the air path of the rotary fan 9 composed of the rotary main plate 9b, the rotary side plate 9a, and the rotary blades 9c is inclined toward the motor 2 from the inside toward the outside. The airflow entering the rotary fan 9 from the fan intake port 9d flows with a force toward the motor 2 (lower side in FIG. 4) due to the inclination of the air path of the rotary fan 9, and is boosted and accelerated. Therefore, the airflow discharged from the rotary fan 9 and passing through the diffuser portion 12 also has a force toward the motor 2 (the lower side in FIG. 4). As a result, since the direction of the airflow is deflected toward the motor 2 in the return air passage 14, the force applied to the airflow is substantially reduced. Therefore, the bending loss in the return air path 14 can be reduced.

  That is, the electric blower 1 according to Embodiment 3 can reduce the bending loss when the direction of the airflow that has passed through the diffuser portion 12 is changed to the motor 2 side by inclining the rotary main plate 9b to the motor 2 side. As a result, the efficiency of the electric blower 1 can be improved.

Moreover, the attachment part 9e to the motor 2 (shaft 3) of the rotation main plate 9b is made flat. For this reason, it is easy to press the rotating fan 9 from the upper and lower surfaces of the rotating main plate 9b. Therefore, the shake when the rotary blade 9c rotates can be reduced.
Note that the shake when the rotary blade 9c rotates causes fluctuations in the collision of the airflow with the stationary blade 13 that causes noise. Further, the shake when the rotary blade 9 c rotates causes the electric blower 1 to vibrate. Therefore, in the electric blower 1 according to Embodiment 3, noise and vibration can be reduced.

  That is, the electric blower 1 according to Embodiment 3 includes a shaft 3 that is an output shaft that is rotatably held, a rotor 4 that has a core 4a that is fixed to the shaft 3, and a coil 4b that is wound around the core 4a. A commutator 6 that is fixed to the shaft 3 and has an action of switching the current direction of the coil 4b of the rotor 4, a brush 7 that is in contact with the commutator 6 and supplies current to the commutator 6 or extracts current from the commutator 6, a rotor 4, a motor 2 having a core 5 a disposed on the outer periphery of the motor 4 and a stator 5 having a coil 5 b wound around the core 5 a, a rotating fan 9 attached to the shaft 3, and a rotating fan 9 having a stationary blade 13. A diffuser unit 12 that decelerates and restores static pressure of the discharged air flow, a return air passage 14 that changes the direction of the air flow that has passed through the diffuser unit 12 toward the inner peripheral side, the rotating fan 9 and the diffuser A fan cover 10 including the user unit 12, the motor 2 is disposed on the rotating main plate 9 b side of the rotating fan 9, and the outer peripheral side of the rotating main plate 9 b is attached continuously to the outer periphery side of the shaft 9. It is characterized by tilting toward the motor 2 side.

Embodiment 4 FIG.
FIG. 5 is an overall view of the electric vacuum cleaner 20 according to the fourth embodiment. In addition, in FIG. 5, the internal structure of the cleaner main body 15 is shown with a broken line.
The vacuum cleaner 20 includes a cleaner body 15, a suction port 16, a pipe 17, and a hose 18. The cleaner body 15 includes the electric blower 1 and a dust collection box 19. The electric blower 1 is the electric blower 1 described in the first to third embodiments.
The vacuum cleaner main body 15 sucks dust together with the air current from the suction port 16 through the rod-shaped pipe 17 and the bendable hose 18 and collects the sucked dust in the dust collection box 19. The electric blower 1 generates an air flow for sucking dust.

  Here, as explained in the first to third embodiments, the electric blower 1 has low bending loss and high efficiency. Therefore, the vacuum cleaner 20 according to Embodiment 4 is efficient.

  The electric blower 1 according to the first to third embodiments can be used not only for household appliances such as the vacuum cleaner 20 but also for industrial equipment such as a liquid pump. Moreover, the vacuum cleaner 20 can suppress energy consumption regardless of home use or business use.

  1 electric blower, 2 motor, 3 shaft, 4 rotor, 4a rotor core, 4b rotor coil, 5 stator, 5a stator core, 5b stator coil, 6 commutator, 7 brush, 8 motor cover, 9 rotating fan, 9a rotating side plate 9b Rotating main plate, 9c Rotating blade, 9d Fan inlet, 9e Mounting part, 10 Fan cover, 10a Upper fan cover, 10b Lower fan cover, 11 Air guide, 12 Diffuser part, 13 Stator blade, 14 Return air path, 15 Vacuum cleaner body, 16 suction port, 17 pipe, 18 hose, 19 dust collection box, 20 vacuum cleaner.

Claims (5)

A motor comprising: a rotor held rotatably; a commutator that switches a direction of current flow in the rotor; a stator that is fixed to the outer periphery of the rotor through a gap; and a shaft that is a rotating shaft; ,
A rotating fan attached to the shaft of the motor;
A fan cover covering the outer periphery of the rotating fan;
A diffuser portion that rectifies the airflow generated by the rotating fan is formed between the fan cover and a return air passage that deflects the airflow that has passed through the diffuser portion toward the rotor included in the motor. And an air guide formed between
The motor includes the commutator on the rotating fan side of the rotor,
The electric blower characterized in that the return air passage passes through the outer periphery of the commutator and is connected to a hole of a motor cover provided on the outer periphery of the stator. The rotating fan is
A side plate having an opening;
A main plate that is provided on the motor side of the side plate so as to face the side plate, and forms a ventilation path between the side plate and an outer peripheral portion of the main plate that warps the motor side;
The electric blower according to claim 1, further comprising: a rotary blade provided between the side plate and the main plate and rotated by rotation of the shaft. The rotating fan is
A side plate having an opening;
A main plate that is provided around the shaft so as to face the side plate on the motor side with respect to the side plate, and forms a ventilation path between the side plate and the vicinity of the shaft is an axial direction of the shaft. A main plate that is a vertical plane, the outer side in the vicinity of the shaft is inclined toward the motor toward the outer periphery,
The electric blower according to claim 1, further comprising: a rotary blade provided between the side plate and the main plate and rotated by rotation of the shaft. The electric blower according to any one of claims 1 to 3, wherein the air guide is inclined toward the motor toward the outer peripheral portion, and the diffuser portion is formed between the fan cover and the fan cover.   An electric vacuum cleaner comprising the electric blower according to any one of claims 1 to 4.

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