JPH07247993A - Motor-driven blower and rotating balance correcting method for motor-driven blower - Google Patents

Abstract

PURPOSE:To improve the accuracy of rotating balance by combination of a commutator motor and a centrifugal impeller so as to reduce vibration and noise by providing a rotating balance correcting part on the commutator side of a rotor of a commutator motor, and providing an opening part for operating balance correction on the motor housing side. CONSTITUTION:A motor-driven blower 1 comprises a motor part 2 and a blower part, 3, and the motor part 2 is formed by storing a rotor 4 and a stator 5 in a motor housing 6 and an end bracket 7. The blower part 3 is formed by integrating a centrifugal impeller 9 with a rotating shaft 23. The rotator 4 is so constructed that a disc 25, a commutator 26 and an iron core 28 are provided on the rotating shaft 23 supported by bearings 21, 22, and in this case, the disc 25 provided with plural blades 25a is installed as a balance correcting member on the end surface of the commutator 26. An opening 6a is provided on the upper surface of the housing 6 opposite to the upper end surface of the disc 25, and a part of the disc 25 is eliminated by a drill passed through the opening part to make balance correction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower equipped with a commutator motor and a centrifugal impeller, and a method for correcting the rotational balance of the electric blower.

[0002]

2. Description of the Related Art Conventionally, as to the balance correction of rotating parts as described above, for example, in Japanese Patent Laid-Open No. 60-122300, a centrifugal force is applied to a rotor before incorporating an air guide having a bearing holding portion which also serves as an end bracket. A technique is disclosed in which the impeller is fixed and the balance is corrected in the state in which these are integrated.

[0003]

In the above-mentioned prior art, the rotor and the centrifugal impeller are integrated to correct the balance, but the combined balance of the rotor and the centrifugal impeller is as follows. In addition to the unbalance amount of the rotating part itself having a large effect, the shaft center accuracy of the bearing when incorporated as a motor also has an effect.

As described above, according to the conventional example, the balance of the rotating portion itself can be corrected, but in the final assembled state of the motor, that is, in the assembled state in which the bearing is held by the air guide as described above, the balance of the rotational balance is improved. There is a problem that the accuracy decreases.

Further, in the commutator motor, if the rotation accuracy of the sliding portion between the carbon brush and the commutator is poor or unstable, the commutation spark becomes large and the performance is deteriorated and the carbon brush is quickly worn. There is a problem that the life becomes short.

The present invention improves the accuracy of the rotational balance by combining a commutator motor and a centrifugal impeller to prevent vibration,
By reducing the noise, especially by improving the balance accuracy of the commutator part, it stabilizes the sliding of the carbon brush and prevents the deterioration of performance and the increase of wear of the carbon brush.
It is suitable for an electric blower rotating at a high speed for the purpose of obtaining a highly reliable electric blower and a method for correcting the rotation balance of the electric blower.

Further, since the temperature rise between the commutator and the carbon brush greatly affects the commutation spark, in the present invention, the temperature rise between the commutator and the carbon brush is suppressed, and the highly reliable electric drive is also provided. Aim to get a blower.

[0008]

A first object of the present invention is to provide a commutator motor in which a rotor and a stator are housed in a motor housing having an opening, and an end bracket is attached to the opening, and the end bracket. A centrifugal impeller attached to a motor rotating shaft penetrating through the electric blower having a structure for cooling the commutator motor by guiding the discharge airflow from the centrifugal impeller into the motor housing from the hole of the end bracket. This is achieved by providing a member for correcting the rotation balance of the motor on the commutator side of the rotor, and providing a balance operation opening in the motor housing so as to face the balance correction member.

Further, according to the rotation balance correction method utilizing the above structure, the balance correction member for the motor provided on the commutator side of the rotor is subjected to the balance correction through the balance correction operation opening of the motor housing. It is to add.

On the other hand, the second object is achieved by providing a member for cooling the commutator and the carbon brush on the commutator side of the rotor in this type of blower.

[0011]

According to the first configuration and the method for correcting the rotational balance using this configuration, a member for correcting the rotational balance of the motor is provided on the commutator side of the rotor of the electric blower, By providing a balance correction operation opening in the housing so as to face the balance correction member, the motor rotation balance correction member provided on the commutator side of the rotor through the balance correction operation opening is provided. Add balance correction.

Further, although the temperature rise between the commutator and the carbon brush greatly affects the commutation spark, according to the second configuration, the commutator and the carbon brush are located on the commutator side of the rotor. By providing the member for cooling, the temperature rise between the commutator and the carbon brush can be suppressed.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an electric blower for an electric vacuum cleaner.

The electric blower 1 is composed of an electric motor section 2 and a blower section 3.

The electric motor unit 2 is a commutator type electric motor, and a rotor 4 and a stator 5 are housed in a motor housing 6 and an end bracket 7.

The rotor 4 is supported by bearings 21 and 22, and one end of the rotary shaft 23 penetrates the end bracket 7 and extends toward the blower unit 3 side.

The fixed guide vanes 8 forming a part of the blower unit 3 are attached to the end bracket 7.

Reference numeral 9 denotes a centrifugal impeller, which has a rotating shaft 23 and a screw 24.
Are fixed together by.

A casing 10 is press-fitted and fixed to the outer periphery of the end bracket 7 so as to cover the fixed guide vane 8 and the centrifugal impeller 9, and the casing 10 holds and fixes the fixed guide vane 8.

The rotor 4 is located between the bearings 21 and 22 at both ends, and the rotating shaft 23 has a disk 25, a commutator 26 and an iron core 2.
Eight.

A winding 27 is wound around the iron core 28, and the winding 27 is electrically connected to a commutator piece located on the outer periphery of the commutator 26.

Reference numeral 11 denotes a brush holder fixed to the outer peripheral surface of the housing 6 by screws. The carbon brush 12 housed in the brush holder 11 is biased in the brush holder 11 by a spring or the like. It is in contact with the outer peripheral surface of the commutator 26 and is electrically connected thereto.

The disc 25 that is in close contact with the end face of the commutator 26 is
A plurality of blades 25a are provided on the outer peripheral portion thereof.

The disc 25 may be either a centrifugal type in which the blades 25a are radially arranged as shown in FIG. 2 or an axial flow type as shown in FIG. 3, which means that when the electric blower 1 is operated, As shown by the arrow in FIG. 11, an air flow is generated on the outer peripheral surface of the commutator 26.

The rotor 4 and the centrifugal impeller 9 are unbalanced due to dimensional variations and the like in manufacturing. However, it is possible to manage the values below a predetermined value by correcting the balance. it can.

14 (a) and 14 (b) show the measurement results of the unbalance amount after the centrifugal impeller 9 is corrected and after the rotor 4 is corrected.

However, when the centrifugal impeller 9 and the rotor 4 are assembled as the electric blower 1, the rotary shaft 2
3 and the inner diameter of the centrifugal impeller 9 and the difference in the vector sum of the respective unbalance amounts.
As shown in (c) of FIG. 4, the combined imbalance amount becomes larger than the values that the centrifugal impeller 9 and the rotor 4 are individually managed, that is, the values shown in FIGS. 14 (a) and 14 (b). The larger this value is, the more vibration noise and reliability are deteriorated.

In other words, the centrifugal impeller 9 and the rotor 4 are integrated with each other, and the balance correction in the final bearing supporting state, that is, the balance correction after the electric blower 1 is assembled is highly accurate and stable. Become.

More specifically, when the electric blower 1 is assembled as shown in FIG. 1 and then the electric motor section 2 is energized,
The centrifugal impeller 9 rotates together with the rotor 4, and the combined imbalance amount is measured and corrected at this time. A specific correction method will be described below.

First, as shown in FIGS. 1 and 4, a balance correction operation opening 6a is provided on the upper surface of the housing 6 so as to face the upper end of the disk 25, and a circle is formed through the drill 51 through the opening 6a. The case where the upper end portion of the plate 25 is deleted and the balance is corrected is shown.

At this time, if the cutting powder enters the electric motor section 2, it may cause a disconnection or a short circuit of the winding wire 27. In order to prevent this, for example, the cutting powder is attached to the outer periphery of the drill 51. A suction nozzle may be arranged.

In FIG. 5, an opening 6a is provided in the side surface of the housing 6 so as to face the peripheral surface of the disk 25, and the peripheral surface of the disk 25 is passed through the opening 6a through a drill 51 as in the case of FIG. This shows a case where the balance is deleted and the balance is corrected.

In FIG. 6, an annular recess 25b is formed at the end of the upper surface of the disk 25, and an opening 6a is provided on the upper surface of the housing 6 so as to face the recess 25b. Disk 25 from dispenser nozzle 52
The case where the balance is corrected by applying an additional load such as an adhesive to the concave portion 25b of FIG.

FIG. 7 shows an opening 6a on the shoulder of the housing 6.
And the blades 25a provided on the outer peripheral surface of the disk 25 through the opening 6a are removed by the cutter 54 to correct the balance.

FIG. 8 is a perspective view showing the connection between the disc indicated by reference numeral 25 in FIG. 7 and the cutter 54.

According to the balance correction method shown in FIGS. 7 and 8, since no cutting powder is generated in the above-described drill cutting, an auxiliary device such as a suction nozzle for cutting powder is not particularly required, and the correction is made. Work becomes easy.

Although not shown in the drawings, when the balance is corrected as described above, an opening 6a is provided in the housing 6 so as to face the upper end of the disk 25 or the peripheral surface of the disk 25, and the opening 6a is formed. You may make it fix a screw for balance correction to a disc through.

As shown in the illustrated embodiment, the disc 25
Is closely attached to the end face of the commutator 26, the commutator 26
And the heat generated by the carbon brush 12 is transferred to the disc 25 and radiated from the surface of the disc 25.
6. It has the effect of reducing the temperature rise of the carbon brush 12.

The impeller formed by the disc 25 may be of either axial flow type or centrifugal type, as described above.
As a result, an air flow is generated on the outer peripheral surface of the commutator 26 to cool the commutator 26 and the carbon brush 12, and the temperature rise of the commutator 26 and the carbon brush 12 can be reduced, thereby improving the reliability of the motor. As a result, the life of the electric blower can be extended.

FIG. 9 shows a cross section of the electric motor section 2.

In FIG. 9, the cooling air mainly flows through the portion A indicated by diagonal lines.

In the conventional electric blower shown in FIG. 10, the cooling air flowing from the blower unit 2 is the stator 5
Also, since the core shape of the rotor 4 has a minute air gap structure, it does not flow around the rotor 4, and therefore the commutator 2
It is hard to flow into the vicinity of 6, and the temperature of the commutator 26 and the carbon brush 12 becomes high.

On the other hand, according to the present invention, as shown in FIG. 11, the airflow generated by the blades 25a of the disk 25 is concentrated and caused to flow around the commutator 26, so that the commutator 26 and the carbon brush 12 are removed. It can be cooled efficiently.

In particular, when the commutator 26 is molded, the holding force of the commutator piece by the synthetic resin becomes weak due to the temperature rise, so that the commutator sparks and whirling occurs during rotation, and the commutation spark becomes large. Although the abrasion of the brush may increase, the effect of efficiently cooling the commutator 26 and the carbon brush 12 by the blades 25a of the disc 25 is great.

In many cases, a resin graphite material is used for the carbon brush 12 for high speed rotation. This is a graphite obtained by sintering graphite with a synthetic resin.
As the temperature rises, the fastening force of the resin also weakens, causing wear and chipping.

FIG. 12 shows characteristics of the conventional electric blower and the electric blower of this embodiment in comparison with each other based on experimental results.
This is an example implemented in an electric blower with power consumption of about 1000 W. The outer shape of the disc 25 is formed to be about 1.5 times the outer diameter of the commutator 26, and the thickness is about 2% of the outer diameter. And
Further, the bladed disk 25 is made of an iron plate, but if it is made of aluminum, copper, or the like, which has high heat conductivity, a greater cooling effect can be expected.

Then, as is clear from FIG.
The effect of cooling the carbon brush 12 by the blades 25a of No. 5 is large, and in particular, the smaller the amount of air blown from the blower unit 3 side, that is, the region in which the temperature of the carbon brush 12 tends to increase, the carbon is smaller than that in the conventional case. It can be seen that the effect of reducing the temperature of the brush 12 is large and the result is favorable.

Further, as is clear from the experimental results of FIG. 12, since the mechanical loss does not increase as compared with the conventional one, that is, the rotation speed hardly decreases, the motor characteristic does not change and the temperature of the carbon brush 12 does not change. It can be seen that it is lower than before.

It should be noted that if the direction of the air flow by the disc 25 having the blades 25a is made to be the same as the direction of the air flow flowing from the blower unit 3 side, the characteristics will not deteriorate.

By the way, in the above embodiment, the disc 2
Although the structure in which 5 is closely attached to the commutator 26 has been exemplified,
When the commutator 26 is molded with a molding resin, if the disc 25 and the commutator 26 are integrally molded, an increase in the number of parts and an increase in the number of assembling steps can be suppressed, and the disc 25 can be formed. The same effect as when the commutator 26 is brought into close contact, that is, the heat generated by the commutator 26 and the carbon brush 12 is transferred to the disc 25 and radiated from the surface of the disc 25. 1
It is possible to obtain the effect of reducing the temperature rise of 2.

In this case, as shown in FIG.
If the blades 25a are also integrally formed, it is possible to further suppress the increase in the number of parts.

Further, in the above embodiment, the case where the disk 25 with blades is provided on the commutator side of the rotor as a member for correcting the rotational balance of the motor and cooling the commutator and the carbon brush is illustrated. However, this is not limited to a circular shape as long as it has a bilaterally symmetrical shape and does not adversely affect the rotational vibration system of the motor. However, it can be said that a circular shape that is simple in shape and excellent in workability is suitable as the base member.

[0054]

As described above, according to the present invention, a member for correcting the rotational balance of the motor is provided on the commutator side of the rotor of the electric blower, and the motor housing faces the balance correcting member so that the balance is corrected. By providing the correction operation opening, through the balance correction operation opening,
By adding balance correction to the rotation balance correction member of the motor provided on the commutator side of the rotor, the accuracy of the rotation balance by the combination of the commutator motor and the centrifugal impeller is improved to reduce vibration and noise. By improving the balance accuracy of the commutator portion, it is possible to stabilize the sliding of the carbon brush, prevent the performance from deteriorating and increase the abrasion of the carbon brush, and obtain a highly reliable electric blower.

Further, although the temperature rise between the commutator and the carbon brush greatly affects the commutation spark, according to the present invention, a member for cooling the commutator and the carbon brush is provided on the commutator side of the rotor. Thus, the temperature rise between the commutator and the carbon brush can be suppressed, and a highly reliable electric blower can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an electric blower showing an embodiment of the present invention.

FIG. 2 is a perspective view of a disc indicated by reference numeral 25 in FIG.

FIG. 3 is a perspective view of a disc 25 different from FIG.

FIG. 4 is a vertical cross-sectional view showing a first example in which balance correction is performed on a rotating portion of an electric blower.

FIG. 5 is a vertical cross-sectional view showing a second example in which balance correction is performed on a rotating portion of an electric blower.

FIG. 6 is a vertical cross-sectional view showing a third example of performing balance correction on an electric blower rotating unit.

FIG. 7 is a vertical cross-sectional view showing a fourth example of performing balance correction on an electric blower rotating unit.

8 is a perspective view showing an engagement between a disc shown by reference numeral 25 in FIG. 7 and a cutter 54. FIG.

9 is a transverse cross-sectional view showing the internal structure of the electric motor portion indicated by reference numeral 2 in FIG.

FIG. 10 is a vertical cross-sectional view showing the flow of airflow of a conventional electric blower.

11 is a vertical cross-sectional view showing the flow of airflow of the electric blower of this embodiment shown in FIG.

FIG. 12 is a diagram showing characteristics of a conventional electric blower and an electric blower of this embodiment in comparison.

FIG. 13 is a vertical sectional view of an electric blower showing another embodiment of the present invention.

FIG. 14 is a diagram showing a rotational unbalance amount after the electric blower is assembled.

[Explanation of symbols]

4 ... Rotor, 6 ... Motor housing, 6a ... Balance correction operation opening, 12 ... Carbon brush, 25 ... Disc,
25a ... blades, 26 ... commutator.

Claims (34)

[Claims] 1. A commutator motor having a rotor and a stator housed in a motor housing having an opening, and an end bracket attached to the opening, and a centrifugal blade attached to a motor rotating shaft passing through the end bracket. An electric blower having a structure for cooling the commutator motor by guiding the discharge airflow from the centrifugal impeller into the motor housing through the hole of the end bracket. An electric blower characterized in that a member for correcting rotation balance is provided, and a balance correction operation opening is provided in the motor housing so as to face the balance correction member. 2. The electric blower according to claim 1, wherein the rotation balance correction member of the motor includes vanes for cooling the commutator and the carbon brush. 3. The electric blower according to claim 1, wherein the rotation balance correction member of the motor is in close contact with the commutator. 4. The electric blower according to claim 1 or 2, wherein the rotation balance correction member of the motor and the commutator are integrally molded with a molding resin. 5. The electric blower according to claim 2, wherein the rotation balance correction member of the motor, the blades, and the commutator are integrally formed of molding resin. 6. The method according to any one of claims 1 to 5,
The electric blower in which the rotation balance correction member of the motor is a disk having an outer diameter dimension larger than the outer diameter of the commutator. 7. The method for correcting the rotational balance of the electric blower according to claim 1, wherein the rotor is provided on the commutator side of the rotor through a balance correction operation opening provided in the motor housing. A rotation balance correction method for an electric blower, characterized in that balance correction is added to a rotation balance correction member of a motor provided. 8. The upper end portion of the rotational balance correcting member according to claim 7, wherein the upper end portion of the rotational balance correcting member is inserted through a balance correcting operation opening provided on the upper surface of the motor housing so as to face the upper end portion of the rotational balance correcting member. How to remove electric blower rotation balance correction. 9. The electric blower according to claim 7, wherein the peripheral surface of the rotational balance correcting member is removed through a drill from a balance correcting operation opening provided on the side surface of the motor housing facing the peripheral surface of the rotational balance correcting member. Rotation balance correction method. 10. The rotation balance correction method for an electric blower according to claim 8, wherein a suction nozzle for cutting powder is arranged on the outer periphery of the drill to delete the end surface of the rotation balance correction member. 11. The rotation balance correcting member according to claim 7, wherein an annular concave portion is formed at an upper end portion of the rotation balance correcting member, and the balance correcting operation opening is provided on the upper surface of the motor housing so as to face the concave portion. A rotation balance correction method for an electric blower, wherein an additional load such as an adhesive is applied from a dispenser nozzle to a concave portion of the rotation balance correction member. 12. The rotation balance correction of an electric blower according to claim 7, wherein the blades provided on the outer peripheral surface of the rotation balance correction member are removed by a cutter through the balance correction operation opening provided on the shoulder portion of the motor housing. Method. 13. The balance correction member according to claim 7, wherein the balance correction operation member has an upper surface end portion facing the upper end portion of the rotation balance correction member and a balance correction operation opening provided on the upper surface of the motor housing. How to fix the rotation balance of the electric blower that fixes the screw of the. 14. The screw for balance correction on the peripheral surface of the rotation balance correction member according to claim 7, through a balance correction operation opening provided on a side surface of the motor housing facing the peripheral surface of the rotation balance correction member. A method for correcting the rotational balance of an electric blower that sticks the stick. 15. A commutator motor in which a rotor and a stator are housed in a motor housing having an opening and an end bracket is attached to the opening, and a centrifugal blade attached to a motor rotating shaft penetrating the end bracket. An electric blower having a structure for cooling the commutator motor by guiding the discharge airflow from the centrifugal impeller into the motor housing through the hole of the end bracket, and a commutator on the commutator side of the rotor. An electric blower, which is provided with a member for cooling the carbon brush. 16. The electric blower according to claim 15, wherein the commutator / carbon brush cooling member includes blades for generating cooling air. 17. The electric blower according to claim 15, wherein the commutator / carbon brush cooling member is in close contact with the commutator. 18. The electric blower according to claim 15 or 16, wherein the commutator / carbon brush cooling member and the commutator are integrally molded with a molding resin. 19. The electric blower according to claim 16, wherein the commutator / carbon brush cooling member, the blade, and the commutator are integrally molded with a molding resin. 20. The electric blower according to claim 15, wherein the carbon brush cooling member is a disk having an outer diameter dimension larger than a commutator outer diameter. 21. A commutator motor having a rotor and a stator housed in a motor housing having an opening and having an end bracket attached to the opening, and a centrifugal blade attached to a motor rotating shaft passing through the end bracket. An electric blower having a structure for cooling the commutator motor by guiding the discharge airflow from the centrifugal impeller into the motor housing through the hole of the end bracket. A member that corrects the rotation balance and cools the commutator and the carbon brush is provided, and the motor housing is provided with an opening for balance correction operation facing the rotation balance correction / commutator / carbon brush cooling member of the motor. An electric blower characterized by being provided. 22. The electric blower according to claim 21, wherein the motor rotation balance correction / commutator / carbon brush cooling member includes blades for generating cooling air. 23. The electric blower according to claim 21 or 22, wherein the motor rotation balance correction / commutator / carbon brush cooling member is in close contact with the commutator. 24. The electric blower according to claim 21 or 22, wherein the motor rotation balance correction / commutator / carbon brush cooling member and the commutator are integrally formed of a molding resin. 25. The electric blower according to claim 22, wherein a motor rotation balance correction / commutator / carbon brush cooling member, a blade, and a commutator are integrally formed of a molding resin. 26. The electric blower according to claim 21, wherein the motor rotation balance correction / commutator / carbon brush cooling member is a disk having an outer diameter larger than an outer diameter of the commutator. . 27. A method for correcting the rotational balance of the electric blower according to claim 21, wherein the rotor is provided on a commutator side of the rotor through a balance correction operation opening provided in the motor housing. A method of correcting the rotational balance of an electric blower, which comprises correcting the rotational balance of a motor provided and also correcting the commutator / carbon brush cooling member. 28. The rotary balance according to claim 27, wherein the drill penetrates through a balance correction operation opening provided on the top surface of the motor housing so as to face the top end portion of the rotation balance correction / commutator / carbon brush cooling member. Correction / Commutator / Carbon brush A method to correct the rotation balance of the electric blower by removing the end surface of the cooling member. 29. The rotation balance correction / commutator according to claim 27, wherein the rotation balance correction / commutator is passed through a drill through a balance correction operation opening provided on a side surface of the motor housing facing the peripheral surface of the rotation balance correction / commutator / carbon brush cooling member.・ A method to correct the rotational balance of the electric blower by removing the peripheral surface of the carbon brush cooling member. 30. The rotation balance correction method for an electric blower according to claim 28, wherein a suction nozzle for cutting powder is arranged on the outer periphery of the drill to remove the rotation balance correction / end face of the commutator / carbon brush cooling member. 31. The rotation correction / commutator / carbon brush cooling member according to claim 27, wherein an annular concave portion is formed at an upper end portion of the cooling member, and the balance correction is provided on the upper surface of the motor housing so as to face the concave portion. A method for correcting the rotational balance of an electric blower, in which an additional load such as an adhesive is attached to the recess of the commutator / carbon brush cooling member from the dispenser nozzle through the operation opening. 32. The blades provided on the outer peripheral surface of the commutator / carbon brush cooling member for correcting rotational balance through the balance correction operation opening provided on the shoulder portion of the motor housing according to claim 27, A method for correcting the rotational balance of an electric blower. 33. The rotational balance correction / rectification via an opening for balance correction operation provided on the upper surface of the motor housing so as to face the upper end of the rotation balance correction / commutator / carbon brush cooling member. A method of correcting the rotational balance of an electric blower, in which a balance correction screw is fixed to the upper end of the child / carbon brush cooling member. 34. The rotation balance correction / commutator according to claim 27, through a balance correction operation opening provided on a side surface of the motor housing facing the peripheral surface of the rotation balance correction / commutator / carbon brush cooling member. -Rotation balance correction method for electric blowers, in which screws for balance correction are fixed to the peripheral surface of the carbon brush cooling member.