JP2005113765A - Electrical blower and electrical vacuum cleaner using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrical blower whose efficiency is high and whose electrical motor is also improved in endurance. <P>SOLUTION: The electrical blower is equipped with an electrical motor 15, an impeller 16 rotating by the electrical motor 15, an outer hull A18 for sheathing the impeller 16, and an outer hull B12 for sheathing an outer circumference of the electrical motor 15. In the outer hull A18, an exhaust unit A25 is provided that exhausts part of an air stream sucked by the impeller 16. In the outer hull B12, an exhaust unit B19 is provided that exhausts outward air supplied from the impeller 16 to an inside of the outer hull B12. When total areas of the exhaust units A25, B19 are defined as S1, S2, respectively, S1, S2 are set as S1≥S2, so that the efficiency of the electrical blower can be improved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

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

  First, the configuration of the most commonly used electric blower for a vacuum cleaner 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. And the fan case 18 is attached so that these may be covered, and it becomes the electric blower 1. FIG. 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 rotates, the impeller 16 fixed to the shaft 6 of the rotor 5 rotates, and the air in the impeller 16 is accelerated. The increased air passes through the diffuser portion 20 of the air guide 17. Then, the vehicle is decelerated and enters the flow changing unit 21, the direction is changed by 180 degrees, and it is guided to the motor 15 through the return path 22. 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.

In the configuration of the general electric blower 1 as described above, there is a limit to the increase in efficiency of the electric blower 1 in accordance with the recent increase in the suction work rate. As an example devised to compensate for this, the following configuration is provided. Are known. According to this, as shown in FIG. 9, a plurality of slits 25 are provided on the outer periphery of the fan case 18, and a part of the air accelerated by the impeller 16 is linearly discharged therefrom, thereby improving the efficiency of the electric blower 1. (For example, refer to 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, there is no description about a guideline for determining the size of the exhaust area provided in the fan case, and the specificity is lacking.

  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-described problems and provide an electric blower with improved efficiency and a vacuum cleaner equipped with the electric blower.

  In order to solve the conventional problem, an electric blower of the present invention includes a motor, an impeller that is rotated by the motor, an outer shell A that covers the impeller, and an outer shell B that covers an outer periphery of the motor. An exhaust part A that discharges a part of the airflow sucked by the impeller is provided in A, and an exhaust part B that exhausts the air supplied from the impeller into the outer part B is provided in the outer B. In addition, when the total area of the exhaust part A is S1 and the total area of the exhaust part B is S2, S1 ≧ S2 is set, and a part of the airflow sucked by the impeller is the exhaust part. Since it is emitted linearly from A, it is efficient. Furthermore, from the relationship of S1 ≧ S2, the amount of air released from the exhaust part A to the atmosphere is equal to the amount of air released from the impeller into the outer shell B and then released to the atmosphere, or Since it is more than that, the amount of air passing around the motor is reduced, so that the flow pressure loss can be reduced, and therefore the efficiency can be further improved.

  ADVANTAGE OF THE INVENTION According to this invention, the electric blower which improved efficiency and the vacuum cleaner carrying it can be provided.

  A first invention includes a motor, an impeller that is rotated by the motor, an outer shell A that covers the impeller, and an outer shell B that covers the outer periphery of the motor, and one of the airflows sucked into the outer shell A by the impeller An exhaust part A for exhausting the air is provided, and the outer part B is provided with an exhaust part B for exhausting the wind supplied from the impeller into the outer part B to the outside, and the total area of the exhaust part A is defined as S1. When the total area of the exhaust part B is S2, it is set so that S1 ≧ S2, and a part of the airflow sucked by the impeller is discharged linearly from the exhaust part A so that the efficiency is improved. Good. Furthermore, from the relationship of S1 ≧ S2, the amount of air released from the exhaust part A to the atmosphere is equal to the amount of air released from the impeller into the outer shell B and then released to the atmosphere, or Since it is more than that, the amount of air passing around the motor is reduced, so that the flow pressure loss can be reduced, and therefore the efficiency can be further improved.

  In the second invention, a diffuser portion having a plurality of passages formed between adjacent stationary blades is provided around the impeller, and an outer shell A on the substantially extension of at least one of the plurality of passages, Since the exhaust part A is disposed, a part of the airflow sucked by the impeller is discharged linearly from the exhaust part A, so that the efficiency is high. Further, since the number of the exhaust parts A is equal to or less than the number of the passages, the amount of air supplied from the impeller into the outer shell B can be increased, the motor can be sufficiently cooled, Durability can also be improved.

  According to a third aspect of the invention, the outer shell A has a substantially circular portion, and a plurality of exhaust portions A are provided in the outer periphery of the substantially circular portion. By disposing toward the lower side in the main body of the vacuum cleaner, it is possible to prevent leakage of sound to the outside of the machine and improve the soundproof performance of the electric blower.

  In the fourth invention, a rib is provided on the outer shell A on the airflow discharge side of the exhaust section A, and the noise emitted from the exhaust section A is reduced, and when the electric blower is incorporated into the main body of the vacuum cleaner, The anti-vibration rubber attached to A can prevent the exhaust part A from being blocked.

  5th invention is the vacuum cleaner provided with the electric blower of any one of the said Claims 1-4, While improving the efficiency of an electric blower and ensuring durability and reliability, usability High vacuum cleaner can be provided.

  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 components as those in the conventional example are denoted by the same reference numerals, and the 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 viewed from the intake port side, and the upper surface of the fan case is omitted. Reference numeral 25 denotes a slit which is an exhaust part A provided on the outer periphery of the fan case (outer shell A) 18. The circumferential width of the slit 25 is a passage formed between adjacent stationary blades 26 of the diffuser part 20. The passage width in the circumferential direction immediately before entering the flow changing portion 21 that changes the flow by 180 degrees is substantially the same, and the slit 25 is disposed on a substantially extension of the passage so that exhaust can be efficiently performed. To be released.

  Here, if the total area of the slits 25 on the outer periphery of the fan case 18 is S1, and the total area of the exhaust port 19 that is the exhaust part B of the anti-load side bracket (outer shell B) 12 is S2, these satisfy S1 ≧ S2. Is set to In addition, the arrows in the figure indicate the flow of air sucked from the intake port 24.

  The operation in the above configuration will be described. When electric power is supplied, as in the conventional example, the rotor 5 rotates and the air flow generated by the impeller 16 passes through the diffuser portion 20 of the air guide 17 and partly goes to the outside air. The remaining air flows through the flow changer 21 and the return passage 22, flows through the motor 15, cools the rotor 5, the stator 2, and the carbon brush 13, and is discharged from the exhaust port 19 of the anti-load side bracket 12. The At this time, the air that has passed through the diffuser section 20 has some dynamic pressure energy, and if the flow is changed by 180 degrees in the flow changing section 21, the bending loss in the same section increases. In this embodiment, since the plurality of slits 25 provided in the fan case 18 are efficiently arranged on the outer periphery of the diffuser portion 20, a part of the air is discharged from the slits 25, and the loss is reduced.

  This increases the efficiency of the fan motor. FIG. 3 shows the relationship between the ratio S1 / S2 of the total area S1 of the slit 25 on the outer periphery of the fan case 18 and the total area S2 of the exhaust port 19 of the anti-load side bracket 12 and the efficiency of the fan motor, according to the operating air volume. ing. According to this, in all the air volumes described, when S1 / S2 <1, the efficiency of the fan motor increases as the ratio increases, and when S1 / S2 ≧ 1, it is almost saturated, and the boundary is S1 / S2. It can be seen that S2 = 1, that is, near S1 = S2.

  Therefore, if the total area S1 of the slits 25 provided on the outer periphery of the fan case 18 is set so that S1 ≧ S2, high fan motor efficiency can be obtained.

  Thus, according to this Embodiment, since the bending loss in the air guide 17 can be reduced, the efficient electric blower 1 is realizable.

  In the present embodiment, the slit that is the exhaust portion A is provided on the outer periphery of the fan case 18, but is provided in a portion that is positioned below the impeller 16 of the anti-load side bracket (outer shell B). In short, a part of the airflow sucked by the impeller may be discharged into the atmosphere before passing through the motor 15.

(Embodiment 2)
Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 4, reference numeral 17 denotes an air guide, on the surface of which 15 passages of the diffuser portion 20 constituted by 15 stationary blades 26 are arranged. On the other hand, the slits 25 provided in the fan case 18 are equally provided at seven places on the circumference, exist on the extension of the passage of the diffuser portion 20, and are attached to the anti-load side bracket 12 by press fitting.

  The operation will be described with the above configuration. Since a part of the air flow generated in the impeller 16 is discharged as it is in the passage of the diffuser portion 20 in which the slit 25 is provided on the extension, it contributes to the efficiency improvement of the electric blower 1. To do. However, most of the passages not provided with the slits 25 are led to the flow changing unit 21 except for a very small amount of air leaking to the adjacent passages, and are used for cooling the motor 15 through the return passages 22. The That is, the role is shared for each passage of the diffuser unit 20 to reliably cool the motor 15.

  As described above, according to the electric blower 1 of the present embodiment, the role of improving the efficiency of the electric blower 1 and the role of cooling the motor 15 are shared for each passage of the diffuser unit 20. The air flow for cooling the motor 15 can be secured, and the electric blower 1 with higher reliability can be provided while increasing the efficiency of the electric blower 1.

(Embodiment 3)
Next, a third embodiment of the present invention will be described with reference to FIG. Note that the same components as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 5 shows an electric blower 1 incorporated in a vacuum cleaner. 101 is a vacuum cleaner body having a dust collection chamber 102 in the front and a motor chamber 103 in the rear. The dust collection chamber 102 has a dust collection chamber 102. A paper bag 104 for dust is attached. In addition, the electric blower 1 has an anti-vibration rubber front 105 attached to the outer periphery of the fan case 18 and an anti-vibration rubber rear 106 attached to the rear side of the anti-load side bracket 12 and is incorporated in the motor chamber 103 of the cleaner body 101. In addition, the electric blower 1 is provided with a plurality of slits 25 in the upper and lower half periphery (only the front is shown) of the fan case 18. Moreover, the arrow in a figure has shown the flow of air.

  The operation in the above configuration will be described. As in the first embodiment, when electric power is supplied, the electric blower 1 is driven and air is sucked from the front of the cleaner. Then, when the air flow passes through the diffuser portion 20 of the air guide 17, it is used for cooling the motor 15 as it is discharged to the outer periphery of the fan case 18, and is used as it is from the exhaust port 19 of the anti-load side bracket 12. In the end, they are mixed again and discharged from the back of the vacuum cleaner.

  At this time, since the efficiency of the electric blower 1 is improved for the same reason as in the first embodiment, the suction force of the cleaner body 101 is also increased. Further, since the slit 25 provided on the outer periphery of the fan case 18 is provided only in the lower half periphery of the fan case 18 having a substantially circular outer shape when the vacuum cleaner body 101 is assembled, noise emitted together with the exhaust gas However, it is discharged only in the downward direction, and for the user of the vacuum cleaner, the cleaning can be performed without a particularly unpleasant sensation compared to the conventional one.

  As described above, according to the present embodiment, since the highly efficient electric blower 1 is mounted and a conventional vacuum cleaner can be obtained, the room can be efficiently cleaned with high suction performance. Is.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described with reference to FIG. Note that the same components as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted.

  Reference numeral 27 denotes a rib which is an eaves-like cut-and-raised portion provided obliquely above the slit 25 on the outer periphery of the fan case 18, and is provided at the upper part of each slit 25 so as to open toward the rear of the cleaner. Yes.

  With the above configuration, the anti-vibration rubber front 105 attached to the outer periphery of the fan case 18 can be prevented from blocking the slit 25 when the electric blower 1 is incorporated into the vacuum cleaner main body 101. Since the opening is made toward the rear of 101, the opening area is not affected. Further, since the air flow is changed obliquely backward by the cut and raised portion 27, the noise of the electric blower 1 exiting from the slit 25 can be reduced. This is more effective when combined with the third embodiment. In addition, when R is provided inside the cut and raised 27, the air flow becomes smoother and the efficiency of the electric blower 1 is improved.

  As described above, according to the electric blower 1 of the present embodiment, it is easy to incorporate the electric blower 1 into the cleaner body 101 by the eaves-like cut and raised 27 provided on the slit 25, and the cut and raised 27 Since the air flow direction is changed, the noise of the electric blower 1 is less likely to directly enter the ears of the user of the vacuum cleaner, so that the vacuum cleaner 1 with higher practicality can be provided.

(Embodiment 5)
Next, a fifth embodiment of the present invention will be described with reference to FIG. Note that the same components as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted.

  Reference numeral 107 denotes a cylindrical soundproof plate disposed so as to surround the electric blower 1. Further, the anti-vibration rubber front 105 is shaped so as to avoid the portion of the slit 25 in which the cut-and-raised 27 is formed, and the protrusion 108 at the tip thereof is assembled so as to cover the end face of the soundproof plate 107. ing.

  With the above configuration, it is possible to prevent the anti-vibration rubber front 105 attached to the outer periphery of the fan case 18 from blocking the slit 25 when the electric blower 1 is incorporated into the cleaner body 101, and the soundproof plate 107 and the anti-vibration rubber front 105 Since it is in close contact, air does not leak from the same part, and the sound is quiet. Furthermore, the exhaust discharged from the cut-and-raised 27 strikes the soundproof plate 107 or the protrusion 108 on the front of the vibration-proof rubber 105 at an angle and flows smoothly along the soundproof plate 107, which becomes an obstacle. There is little pressure loss.

  As described above, according to the present embodiment, when attaching the soundproof plate 107 that surrounds the electric blower 1, an angle can be given to the direction in which the exhaust flows by the eaves-like cut and raised portion 27 provided above the slit 25. Therefore, the exhaust gas flows smoothly along the soundproof plate 107, and it is possible to provide a vacuum cleaner having high sound insulation while suppressing performance deterioration.

  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 with the top surface of the fan case removed Characteristic diagram showing the ratio of the total area of the fan case outer perimeter slit and the total exhaust area of the bracket to the efficiency of the electric blower The top view which removed the fan case upper surface of the electric blower which shows the 2nd Embodiment of this invention Sectional drawing of the vacuum cleaner which shows the 3rd Embodiment of this invention (A) Partially expanded sectional view of the vacuum cleaner which shows the 4th Embodiment of this invention (b) AA expanded sectional view of Fig.6 (a) Partially expanded sectional view of the vacuum cleaner which shows the 5th Embodiment of this invention Partial sectional view showing a conventional electric blower Partial sectional view showing the other electric blower

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric blower 2 Stator 5 Rotor 12 Anti-load side bracket (outside B)
13 Carbon brush 15 Motor 16 Impeller 17 Air guide 18 Fan case (Outer A)
19 Exhaust port (exhaust part B)
20 Diffuser part 21 Flow change part 22 Return passage 24 Inlet 25 Slit (exhaust part A)

Claims (5)

An exhaust section that includes a motor, an impeller that is rotated by the motor, an outer shell A that covers the impeller, and an outer shell B that covers the outer periphery of the motor, and discharges a part of the airflow sucked into the outer shell A by the impeller A is provided, and the outer shell B is provided with an exhaust portion B for exhausting the air supplied from the impeller into the outer shell B to the outside, and the total area of the exhaust portion A is S1, and the exhaust portion B An electric blower set so that S1 ≧ S2 when the total area is S2. A diffuser portion having a plurality of passages formed between adjacent stationary blades is provided around the impeller, and an exhaust portion A is disposed in an outer shell A substantially extending from at least one of the plurality of passages. The electric blower according to claim 1. 3. The electric blower according to claim 1, wherein the outer shell A has a substantially circular portion, and a plurality of exhaust portions A are provided in a semicircular range of the outer periphery of the substantially circular portion. The electric blower according to any one of claims 1 to 3, wherein a rib is provided on the outer shell A on the airflow discharge side of the exhaust part A. The vacuum cleaner provided with the electric blower of any one of the said Claims 1-4.

Images