JPH11294391A - Electric air blower, and vacuum cleaner furnishing electric air blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric air blower and a vacuum cleaner furnishing that which improve the ventilation efficiency by reducing the ventilation loss when the air flows in an electric motor, and improve the service life by cooling the brush of the electric motor effectively. SOLUTION: A housing 3 is formed in about a tubular form provided with an opening at the centrifugal impeller side, and the bottom at the opposite side. The opening of the housing 3 is formed to make the distance L1 from the axial core of the rotary shaft 4 of the opening to the inner wall of the housing 3 longer than the distance L2 from the axial center of the rotary shaft 4 to the inner wall of the housing 3 in the right angle direction to a stator coil 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vacuum cleaner using an electric blower having a centrifugal impeller, and more particularly to an electric blower having a small air loss in the electric blower and an electric vacuum cleaner provided with the same. is there.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 6-257598 discloses a device for improving ventilation in an electric blower. Japanese Unexamined Patent Publication No. Hei 6-257598 discloses an electric blower in which a plurality of concave ventilation passages are radially provided in a round chamfer from a flat portion protruding outside a cylindrical portion of a bracket toward a cylindrical portion. A configuration is disclosed in which turbulence generated at the time is reduced, the efficiency of the motor is improved, and the vibration is reduced by increasing the strength of the bracket by the rib effect.

[0003]

However, in the above-mentioned prior art, when air flows into the motor from the blower side of the electric blower, the flow direction is bent from the radial direction to the axial direction, so that the loss due to bending is caused. There was a problem that was large.

Further, when air flows into the motor, if the end bracket has a single-letter shape, it is difficult for air to flow into the motor side of the end bracket. Therefore, the amount of air flowing between the housing and the stator in the direction perpendicular to the end bracket is increased, and the flow velocity is increased, so that there is a problem that the motor ventilation loss increases.

[0005] Further, when an attempt is made to increase the speed of the electric blower, the amount of heat generated by the brushes of the motor section increases, which may cause a reduction in motor efficiency or a reduction in the life of the motor. In this case, it is necessary to effectively cool the brush of the electric motor. In particular, when the size of a blower is reduced in recent years, the influence is great.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electric blower with reduced ventilation loss when air flows through a motor section and improved ventilation efficiency, and a vacuum cleaner having the same.

[0007] Further, the present invention provides an electric blower having a long life and a vacuum cleaner provided with the same, by extending the life of the brush by effectively cooling the brush of the electric motor section by the air flow, thereby improving the electric motor efficiency. Is to do.

[0008]

Means for Solving the Problems In order to achieve the above object, the features of the electric blower of the present invention are as follows.
The one-way diameter of the opening surrounded by the inner wall of the substantially cylindrical housing is longer than the diameter in the direction perpendicular to the one direction.

Specifically, the present invention provides the following apparatus and method.

According to the present invention, there is provided a rotor having a rotating shaft for rotating a centrifugal impeller, a stator disposed to face the rotor and having a stator coil wound thereon, and a rectifier for contacting a commutator of the rotor to rectify a coil current. Brush and the rotor,
In the electric blower including the stator and the housing that houses the brush, the housing is formed in a substantially cylindrical shape having an opening on the centrifugal impeller side and a bottom on the opposite side, and is surrounded by an inner wall of the housing. An electric blower is provided, wherein a diameter of the opening in one direction is longer than a diameter of the opening in a direction perpendicular to the one direction.

Preferably, the inner wall of the housing is formed at a position in the opposite direction from the opening so that the diameter in one direction is the same as the diameter in a direction perpendicular to the one direction.

Preferably, the opening is formed by combining two circles having the same center and different diameters.

Further, the present invention provides a rotor having a rotating shaft for rotating a centrifugal impeller, a stator disposed opposite to the rotor and having a stator coil wound thereon, and a coil current contacting a commutator of the rotor. In a motor-driven electric blower having a brush for rectifying the electric current, and a housing for accommodating the rotor, the stator, and the brush, the brush connects an axis of the rotating shaft and a substantially middle point on one side of the outside of the stator. An electric blower is provided, which is attached at a predetermined angle to a downstream side in a rotation direction of the centrifugal impeller with respect to a reference line.

Further, the present invention provides a rotor having a rotating shaft for rotating a centrifugal impeller, a stator having a stator coil wound around the rotor, and a coil current contacting a commutator of the rotor. In the electric motor-driven blower having a brush for rectifying the electric current, and a housing for accommodating the rotor, the stator, and the brush, the brush is provided in the vicinity of the brush side of a space formed between the stator and the rotor. And a commutator and a guide for applying the flow of the inflow air to the commutator.

Further, the present invention provides a rotor having a rotating shaft for rotating a centrifugal impeller, a stator disposed opposite to the rotor and having a stator coil wound thereon, and a coil current contacting a commutator of the rotor. In the electric blower having a brush that rectifies the electric current and a housing that houses the rotor, the stator, and the brush, a power terminal of the electric blower is provided near the brush and downstream of the centrifugal impeller in the rotation direction. An electric blower characterized by being provided.

According to another aspect of the present invention, there is provided a dust collecting chamber joined to a suction port for sucking dust on a cleaning surface, and an electric blower arranged behind the dust collecting chamber for forming an air flow for sucking the dust from the suction port. Wherein the electric blower has a rotor having a rotating shaft for rotating a centrifugal impeller that forms a front air flow, a stator disposed opposite to the rotor and having a stator coil wound thereon, A brush that contacts a commutator of the rotor and rectifies the coil current; and a housing that houses the rotor, the stator, and the brush, wherein the housing has an opening on the centrifugal impeller side and a bottom on the opposite side. Is formed in a substantially cylindrical shape provided with
A vacuum cleaner is characterized in that a diameter in one direction of the opening surrounded by an inner wall of the housing is longer than a diameter in a direction perpendicular to the one direction.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electric blower according to an embodiment of the present invention and a vacuum cleaner having the same will be described with reference to the drawings.

FIG. 11 is an external perspective view of a vacuum cleaner according to an embodiment of the present invention. The vacuum cleaner is a vacuum cleaner main body 201 having a built-in electric blower and a dust collecting filter.
A hose 203 rotatably connected to the vacuum cleaner main body 201, a hose hand portion 204 provided at a tip of the hose 203, an extension pipe 205, and a suction port 206 attached to a tip of the extension pipe 205. It is composed of The hose hand section 204 is provided with a switch operation section 207 for controlling the electric blower in the vacuum cleaner main body 201.

FIG. 12 shows the vacuum cleaner main body 201 of FIG.
2 shows a longitudinal side view of the vehicle. The outer periphery of the vacuum cleaner main body 201 is constituted by a lower case 301, an upper case 302, and a dust collecting cover 303. A suction port 304 is formed in the dust collection lid 303, and a dust collection chamber 306 that accommodates a dust collection bag 305 joined to the suction port 304 is formed inside the suction port 304. An electric blower chamber 307 follows the dust collection chamber 306, and houses an electric blower 308 according to an embodiment of the present invention.

Next, the configuration of the electric blower will be described with reference to FIG. The electric blower 308 is roughly divided into a blower 1 and an electric motor 2.

The blower 1 includes a centrifugal impeller 12 and a fan casing 1 which houses the centrifugal impeller 12 from both sides.
3 and a diffuser 11 and a stationary channel portion 10 having a return guide 14 on the back surface of the diffuser 11.

The motor 2 includes a case comprising a housing 3 and an end bracket 9, a rotor 5 having a rotating shaft 4 housed in the case, and a stator 7 on which a stator coil 6 is wound.

Next, the flow of air in the electric blower 308 will be described.

When the motor 2 is driven to rotate the centrifugal impeller 12, air 101 flows into the fan casing 13 from the suction port 13b. At this time, the airflow guide 13a
The airflow flowing into the centrifugal impeller 12 is rectified.

The air flow 10 discharged from the centrifugal impeller 12
2 passes between the diffuser blades 11 and forms a stationary flow path 1
The direction is changed by 180 degrees in an annular gap between the outer circumference of the fan casing 13 and the inner circumference of the fan casing 13, and is further introduced into the housing 3 after passing between the blades of the return guide 14.

At this time, the air 104 introduced into the housing 3 passes through an air flow path formed in the housing 3 to cool the rotor 5, the stator coil 6, and the brush 15, and is discharged from the exhaust port 3c to the outside. Is done.

In the electric blower 308 having the above structure, the air 10 flowing into the motor 2 can be improved in order to improve the ventilation efficiency.
4 is important to flow smoothly.
There is also a need for a flow of air that effectively cools the heat-generating section inside.

An electric blower according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a vertical cross section of an electric blower according to a first embodiment of the present invention. 2 shows a cross section taken along the line AA of FIG. 1, FIGS. 3 and 4 show the unitary shape of the housing of FIG. 2, and FIG.
3B shows a cross section.

As shown in FIGS. 2 and 3, at the opening 3a on the centrifugal impeller side 12 of the housing 3, a first distance from the axis of the rotary shaft 4 on the stator coil 6 side to the inner wall of the housing 3 is set. L1 is configured to be longer than a second distance L2 from the axis of the rotating shaft 4 to the inner wall of the housing 3 in a direction perpendicular to the stator coil 6. That is, the diameter of the opening 3 a on the side of the stator coil 6 is made longer than the diameter in the direction perpendicular to the stator coil 6.

As the opening 3a expands toward the bottom of the housing 3, the first distance L1 becomes larger than the second distance L2.
The inner wall of the housing is formed in the same manner as described above.

With the above structure, when air flows from the return guide 14 into the A air flow path 22 formed between the inner wall of the housing 3 on the stator coil 6 side and the outer surface of the stator 7, Since the radius of curvature of the flow path is increased, separation of air flow is reduced, and ventilation loss due to bending can be reduced.

Further, by increasing the flow area of the A air flow path 22 formed between the inner wall of the housing 3 and the outer surface of the stator 7, the flow velocity of the air flowing through the motor 2 can be reduced. Thus, ventilation loss due to collision or the like can be reduced.

The housing 3 of the embodiment shown in FIG.
Can be manufactured by a pressing process such as deep drawing. However, after manufacturing the cylindrical housing 3, a hole is formed in the housing 3 on the side of the stator coil 6, and then another cover is screwed or the like. An equivalent effect can be obtained.

The shape of the opening 3a of the housing 3 viewed from the centrifugal impeller 1 side in FIG. 2 is a combination of two circles having different diameters, but as shown in FIG. The shape of 3a is the first distance L1 from the axis of the rotating shaft 4 on the side of the stator coil 6 to the inner wall of the housing 3.
Can be achieved with an elliptical shape having a major axis and a minor axis of a second distance L2 from the axis of the rotating shaft 4 to the inner wall of the housing 3 in a direction perpendicular to the stator coil 6.

FIG. 6 shows a cross section of the return guide portion of the electric blower according to the second embodiment of the present invention as viewed from the centrifugal impeller 1 side. As shown in FIG. 6, the brush 15 has a structure in which the brush 15 is attached at a predetermined angle α to the rotation direction downstream side of the centrifugal impeller 12 from a substantially middle point M of one side 7a of the stator 7.

Since the flow of air in the housing 3 has a swirling component, the airflow B formed between the inner wall of the housing 3 and the outer surface of the stator 7 on the brush 15 side of the end bracket 9.
In the air flow path 23 and the C air flow path 24 formed between the rotor 5 and the stator 7, the air flow increases in the downstream side in the rotation direction of the centrifugal impeller 12, and the flow velocity also increases. Therefore, in the vicinity of the brush 15 mounted on the downstream side in the rotation direction, the amount of air flow increases, and the flow velocity also increases.

In the present embodiment, with the above-described structure, the air flow efficiently hits the brush 15 and the brush 15 can be sufficiently cooled. For this reason, the motor efficiency is improved.

Further, since the brush 15 can be efficiently cooled, the life of the brush 15 is extended, the motor efficiency is improved, and the life of the electric blower is prolonged.

FIG. 7 shows the mounting of the end bracket of the electric blower according to the third embodiment of the present invention. As shown in FIG. 7, the end bracket 9 is mounted at a predetermined angle β on the downstream side in the rotation direction of the centrifugal impeller 12 from a substantially middle point M of one side 7a of the stator 7.

In the present embodiment, with the above structure, the B air flow path 23 and the rotor 5 formed between the inner wall of the housing 3 and the outer surface of the stator 7 on the brush 15 side of the end bracket 9 In the C air passage 24 formed between the stator 7 and the stator 7, the amount of air flowing from the return guide 14 increases, and the flow rate of air for effectively cooling the rotor 5 and the brush 15 increases. And the life of the electric blower is improved.

FIG. 8 shows the mounting of a guide for an electric blower according to a fourth embodiment of the present invention, and FIG.
2 shows details of the C section (guidance guide). As shown in FIGS. 8 and 9, the guide toward the vicinity of the contact point between the brush 15 and the commutator 5 a of the rotor 15 is provided on the brush 15 side of the C air flow path 24 formed between the rotor 5 and the stator 7. The guide 30 is provided.

In the present embodiment, by adopting the above structure, the flow of air in the direction of the arrow flowing out from the C air flow path 24 can be effectively applied to the commutator 5a and the brush 15, so that the commutator 5a and brush 15 can be cooled,
The motor efficiency is improved, and the electric blower efficiency is improved.

Since the brush 15 can be cooled efficiently, the life of the brush, that is, the life of the electric blower is improved.

Further, when the flow of air from the C flow path 24 flows out from the end of the stator 7 on the brush 15 side, the flow separation can be reduced due to a sudden increase in the flow path area, and the flow can rapidly expand. Since the loss is reduced, the ventilation efficiency of the electric blower is improved.

FIG. 10 shows a cross section of the return guide section of the electric blower according to the fourth embodiment of the present invention as viewed from the centrifugal impeller side. The position of the power supply terminals 32 of the electric motor 2 is adjusted with respect to the brush 15 near each power supply terminal 32 by the centrifugal impeller 12.
Is provided on the downstream side in the rotation direction.

Since the air flow in the housing 3 has a swirl component, the A air formed between the inner wall of the housing 3 and the outer surface of the stator 7 on the stator coil 6 side near the power supply terminal 32 when the axial position is near the power supply terminal 32. The flow path 22, the inner wall of the housing 3 on the brush 15 side of the end bracket 9 and the stator 7
B air passage 23 formed between the outer surface of the rotor 5 and the rotor 5
The air flow in the C air flow path 24 formed between the centrifugal impeller 12 and the stator 7 has a large air volume and a high flow velocity on the downstream side in the rotation direction of the centrifugal impeller 12. Also, among the three types of air flow paths, the A air flow path 22 has a large air volume. Therefore, if the power terminal 32 is provided between the A air flow path 22 and the exhaust hole 3C, the air flow resistance becomes a resistance to the flow of air. , Increases ventilation losses.

In this embodiment, by adopting the above structure, the ventilation loss due to the exhaust can be reduced, and the ventilation efficiency of the electric blower can be improved.

[0048]

According to the present invention, the flow velocity when flowing through the housing can be reduced by increasing the flow passage area of the air flow passage formed between the stator of the electric motor and the inner surface of the housing. Reduced ventilation loss,
Separation due to rapid expansion of the air flow formed between the rotor and the stator is reduced, and loss of rapid flow expansion can be reduced.

Further, since the radius of curvature of the flow path can be increased, separation of the flow can be reduced, the loss due to bending can be reduced, and the ventilation efficiency of the electric blower can be improved.

According to the present invention, the amount of air to cool the brush can be increased, and the air flow formed between the rotor and the stator can be effectively applied to the commutator and the brush. The commutator and the brush can be sufficiently cooled, and as a result, the motor efficiency can be improved and the life of the electric blower can be prolonged.

The reliability of the vacuum cleaner can be improved by improving the ventilation efficiency and the life of the electric blower.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of an electric blower according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a diagram showing a single unit shape of the housing of FIG. 1;

FIG. 4 is a diagram in which a single unit shape of the housing of FIG. 3 is formed into an elliptical shape.

FIG. 5 is a sectional view taken along the line AOB of FIG. 2;

FIG. 6 is a cross-sectional view of a return guide section of the electric blower according to the second embodiment of the present invention as viewed from the centrifugal impeller 1 side.

FIG. 7 is a mounting view of an end bracket of an electric blower according to a third embodiment of the present invention.

FIG. 8 is a mounting diagram of a guide for an electric blower according to a fourth embodiment of the present invention.

FIG. 9 is a detailed view of a portion C (guide guide) of FIG. 8;

FIG. 10 is a cross-sectional view of a return guide portion of an electric blower according to a fourth embodiment of the present invention as viewed from a centrifugal impeller side.

FIG. 11 is an external perspective view of a vacuum cleaner according to one embodiment of the present invention.

FIG. 12 is a vertical side view of the vacuum cleaner main body of FIG. 11;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... blower, 2 ... electric motor, 3 ... housing, 3c ... exhaust port, 4 ... rotating shaft, 5 ... rotor, 5a ... commutator, 6 ... stator coil, 7 ... stator, 7a ... one side of stator 7,
Reference numeral 9: end bracket, 10: stationary flow path portion, 11: diffuser, 12: centrifugal impeller, 13: fan casing, 13a: air flow guide, 13b: suction port, 14: return guide, 15: brush, 22: A air Channel, 23 ...
B air passage, 24 ... C air passage, 30 ... Guide guide, 3
2 ... power supply terminal, 101 ... air, 102 ... air flow, 104
... air, 308 ... electric blower, L1 ... first distance, L2
... Second distance, M ... Approximate middle point

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Fumio Joraku 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Prefecture Inside the Electrification Equipment Division of Hitachi, Ltd. (72) Inventor Yosuke Nagano 502, Kandachicho, Tsuchiura-shi, Ibaraki Prefecture Inside Hitachi Mechanical Co., Ltd.

Claims (7)

[Claims] 1. A rotor having a rotating shaft for rotating a centrifugal impeller, a stator arranged opposite to the rotor and having a stator coil wound thereon, and a brush contacting a commutator of the rotor to rectify coil current. And a housing that houses the rotor, the stator, and the brush, wherein the housing is formed in a substantially cylindrical shape having an opening on the centrifugal impeller side and a bottom on the opposite side. An electric blower, wherein a diameter in one direction of the opening surrounded by an inner wall of the housing is longer than a diameter in a direction perpendicular to the one direction. 2. The housing according to claim 1, wherein the inner wall of the housing is formed at a position in the opposite direction from the opening so that the diameter in the one direction is the same as the diameter in a direction perpendicular to the one direction. An electric blower characterized by being performed. 3. The electric blower according to claim 1, wherein the opening has a shape formed by combining two circles having the same center and different diameters. 4. A rotor having a rotating shaft for rotating a centrifugal impeller, a stator disposed to face the rotor and having a stator coil wound thereon, and a brush contacting a commutator of the rotor to rectify coil current. And an electric motor-driven blower having a housing for accommodating the rotor, the stator, and the brush, wherein the brush is positioned with respect to a reference line connecting an axis of the rotation shaft and a substantially middle point on one side of the stator. An electric blower, which is mounted at a predetermined angle on the downstream side in the rotation direction of the centrifugal impeller. 5. A rotor having a rotating shaft for rotating a centrifugal impeller, a stator disposed to face the rotor and having a stator coil wound thereon, and a brush contacting a commutator of the rotor to rectify coil current. And a housing for accommodating the rotor, the stator, and the brush, wherein the brush and the commutator are provided near a brush side of a space formed between the stator and the rotor. And a guide for applying the flow of the inflow air to the air blower. 6. A rotor having a rotating shaft for rotating a centrifugal impeller, a stator disposed to face the rotor and having a stator coil wound thereon, and a brush contacting a commutator of the rotor to rectify coil current. And a housing that houses the rotor, the stator, and the brush, wherein a power terminal of the electric blower is provided near the brush and downstream in the rotation direction of the centrifugal impeller. And electric blower. 7. An electric cleaner comprising: a dust collection chamber joined to a suction port for sucking dust on a cleaning surface; and an electric blower disposed behind the dust collection chamber and configured to form an air flow for sucking the dust from the suction port. The electric blower comprises: a rotor having a rotating shaft for rotating a centrifugal impeller that forms a front air flow; a stator disposed to face the rotor and having a stator coil wound thereon; and a commutator of the rotor. And a housing for accommodating the rotor, the stator, and the brush. The housing has an opening on the centrifugal impeller side and a bottom on the opposite side. A vacuum cleaner, wherein a diameter in one direction of the opening formed in a cylindrical shape and surrounded by an inner wall of the housing is longer than a diameter in a direction perpendicular to the one direction.