JPH11173297A - Electric vacuum cleaner - Google Patents

Abstract

(57) [Summary] In an electric blower having an end bracket as a component when air flows into a motor, the end bracket makes it difficult for air to flow between a stator and a rotor. When air flows between the housing and the stator, the loss due to the swirling component of the flow is large. An electric blower (308) including an electric motor (2) and a blower (1) changes the direction of the rear end of the guide vane blades of the return guide (14) according to the position of the guide vane of the return guide (14) and the positional relationship of the end bracket (9). [Effect] The amount of air flowing between the stator and the rotor is increased, and the flow balance of the return guide is improved. Also,
The air flowing between the housing and the stator has a reduced swirling component and increases the efficiency of the electric blower.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner using an electric blower having a centrifugal impeller, and more particularly to a vacuum cleaner suitable for reducing the size and weight and increasing the output.

[0002]

2. Description of the Related Art In order to improve the efficiency of an electric blower of a vacuum cleaner, it is important to flow air flowing into the electric motor without any loss, and to effectively generate heat in the electric motor. A cooling air flow is also required.

[0003] As a device for improving the flow in the electric motor, there is one disclosed in Japanese Patent Application Laid-Open No. 2-185697.

[0004] The structure disclosed in Japanese Patent Application Laid-Open No. 2-185697 has an air guide which forms a first return passage and a second return passage following a diffuser, and includes a field iron core fixed to a motor frame. The first between the motor frames
And a second exhaust passage is formed between the field iron core and the armature located inside the field iron core, and the first exhaust passage and the second exhaust passage It is separated and exhausted.

[0005] With this configuration, the discharge airflow from the fan passes through the two passages, thereby increasing the area of the exhaust passage, reducing the resistance of the airflow, and smoothing the discharge.

[0006]

According to the above prior art, in the case of an electric blower having an end bracket as a component when air flows into the motor, the flow of air guided from the return guide into the motor is reduced by the end guide. The end bracket has a problem in that it collides with the bracket and the air flow resistance is large, so the loss is large, and the end bracket makes it difficult for air to flow between the stator and the rotor.

Further, by dividing the return flow path into a first return path and a second return path, the return flow path portion becomes large, and as a result, the flow path length increases, friction loss increases, and the return flow path increases. Since the swirling component of the flow does not become sufficiently small in the road portion, there is a problem that a large loss occurs when air flows between the housing and the stator in the motor portion. In particular, the effect is great when high-speed rotation is to be achieved with the recent downsizing and weight reduction of the blower.

In order to increase the speed of the electric blower,
When the calorific value of the motor increases and the efficiency of the motor decreases,
In addition, there is a problem that the life of the motor is shortened. Therefore
It is necessary to effectively cool the heat generating part of the motor.
You.

Therefore, an object of the present invention is to provide an electric vacuum cleaner having improved electric blower efficiency, that is, improved suction power of the vacuum cleaner.

[0010]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a centrifugal impeller, a fan casing for accommodating the centrifugal impeller sandwiched from both sides, a blower including a return guide, a case including a housing and an end bracket. And an electric blower including an electric motor composed of a rotor having a rotating shaft housed in a case, and a stator on which a stator coil is wound, when air flow is guided from the return guide to the electric motor. Of the guide vanes of the return guide, a return guide vane that passes over the end bracket and a return guide vane that constitutes a flow passage that is blocked by the end bracket have a wing rear end directed substantially in the circumferential direction, and other The return guide vane is achieved by orienting the trailing end of the blade substantially in the axial direction.

[0011] Further, the shape of the rib of the end bracket is extended in the axial direction opposite to the centrifugal impeller,
This is achieved by playing the role of a current plate.

Further, this can be achieved by increasing the effective opening area between the stator and the rotor.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 10 is an external perspective view of a vacuum cleaner to which the present invention is applied, and FIG. 11 is a vertical sectional side view of a vacuum cleaner main body.

As shown in FIG. 10, a hose hand 204 provided at the end of a hose 203 rotatably connected to an electric vacuum cleaner main body 201 having a built-in electric blower and a dust collecting filter is provided with an extension tube 205 interposed therebetween. A suction port 206 is attached. The hose hand unit 204 includes a switch operation unit 207 for controlling the electric blower in the vacuum cleaner main body 201.

Next, the configuration of the vacuum cleaner main body 201 will be described with reference to FIG.

The main body 201 of the vacuum cleaner is
1. An outer shell is constituted by the upper case 302 and the dust collecting cover 303. A suction port 304 is formed in the dust collection lid 303, and inside the dust collection bag 30, which is joined to the suction port 304, is formed.
5 is formed. Dust collection room 3
In the rear of 06, an electric blower room 307 follows, and an electric blower 308 is housed.

The present invention particularly relates to the electric blower 308. Therefore, the electric blower 308 will be described in detail with reference to FIG.

The electric blower 308 includes the blower 1 and the electric motor 2
Are roughly divided into The blower 1 includes a centrifugal impeller 12, a fan casing 13 for accommodating the centrifugal impeller 12 from both sides thereof, a diffuser 11, and a stationary flow path unit 10 having a return guide 14 on the back surface of the diffuser 11. You.

The electric motor 2 comprises 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, the air 101 flows into the fan casing 13 from the suction port 13b. At this time, the airflow guide 13a
Rectifies the airflow flowing into the centrifugal impeller 12. The airflow 102 discharged from the centrifugal impeller 12 passes between the diffuser blades 11, and flows through an annular gap between the outer periphery of the stationary flow passage 10 and the inner periphery of the fan casing 13.
After turning around and passing between the wings of the return guide 14, it is introduced into the housing 3. At this time, the air 104 introduced into the housing 3 passes through an air flow path formed in the housing 3, cools the rotor 5, the stator coil 6, and the brush 15 (see FIG. 3), and outputs the air from the exhaust port 3c to the outside. Is discharged to

In order to improve the efficiency of the electric blower 308 as described above, it is important to flow the air 104 flowing into the motor 2 without loss, as described above. There is also a need for a flow of air that effectively cools the heat-generating section inside.

One embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a return guide flow path diagram of the electric blower of FIG. 1, and FIG. 3 is a longitudinal sectional view of the electric blower at section AOB shown in FIG.

As shown in FIGS. 2 and 3, in the electric feeder according to the present embodiment, the return guide 14 forms an end bracket guide 17 and a D flow path 16a in which the flow of air is blocked by the end bracket 9. It comprises a return guide vane 14a, a return guide vane 14b passing over the end bracket 9, and one or more return guide vanes 14c. The return guide 14 includes a D flow path 16a in which the air flow is blocked by the end bracket 9, an E flow path 16b formed by the return guide vane 14b and the end bracket guide 17 passing over the end bracket 9, and other flow paths. To form

The return guide 14 is formed by a return guide vane 14 d which passes over the end bracket 9 with the return guide vane 14 a side of the return guide vane 14 a constituting a D flow passage 16 a in which the flow is blocked by the end bracket 9. Has a structure in which the rear end of the blade is directed substantially in the circumferential direction, and the other return guide vanes 14c have a structure in which the rear end of the blade is directed substantially in the axial direction.

In the structure of this embodiment, the swirl component remains at the outlet of the D channel 16a and the E channel 16b. Therefore, the flow of the air colliding with the end bracket 9 is reduced, so that the ventilation resistance is reduced, and the amount of air passing through the end bracket 9 on the side opposite to the centrifugal impeller 12 is increased. Therefore, the A air flow path 21 formed between the rotor 5 and the stator 7 and the space formed between the outer surface of the stator 7 and the inner surface of the housing 3 are opposite to the centrifugal impeller 12 of the end bracket 9. On the side, the amount of air guided to the C space 23 at the position where the end bracket 9 is extended in the axial direction increases, and the flow rate balance of the air flowing through each flow path of the return guide 14 improves.

The air flow paths other than the D flow path 16a and the E flow path 16b reduce the swirling component of the air flow, so that the air flow path between the housing 3 not blocked by the end bracket 9 and the inner surface of the stator 7 is formed. It flows into the formed B air flow path 22 in the axial direction. For this reason, in the B air passage 22, the corner portion 22a where the stator 7 and the inner surface of the housing 3 intersect is formed.
Peeling loss can be reduced. Further, in the flow of the air flowing through the B air flow path 22, the swirl component of the air flow is reduced, so that the loss due to the swirl of the flow is reduced.

Further, by changing the shape of the blades of the return guide 14 according to the positional relationship between the end bracket 9 and the return guide 14, it is not necessary to increase the flow path length of the return guide 14. , The flow of air from each flow path of the return guide 14 flows through an appropriate flow path of the air flow path formed in the housing 3, and the flow loss in the housing 3 is reduced. The size can be reduced and the size can be reduced. In addition, since the air volume of the A air flow path 21 increases, the electric motor 2
The rotor 5, the stator coil 6, and the brush 15 inside can be effectively cooled, the motor efficiency is improved, and the electric blower efficiency is improved.

In the present invention, in the above-described embodiment, since the air flow flows into the B air passage 22 in the axial direction, the corner where the stator 7 and the inner surface of the housing 3 intersect in the B air passage 22 is formed. The separation loss of the portion 22a can be reduced, and the flow of the air flowing through the B air flow path 22 has a reduced swirling component of the air flow, so that the loss due to the swirling of the flow in the housing 3 can be reduced. Further, the B air passage 22
By providing a guide vane 14d that is shorter than the return guide vane 14c near the outlet of one or more of the flow paths of the return guide that guides air to the flow path, the turning of the blade is sharp. Therefore, the loss due to separation can be prevented, and the swirl component of the flow can be effectively reduced.

Next, another embodiment of the present invention will be described with reference to FIGS. FIG. 4 shows the end bracket 9 of FIG.
FIG. 2 is a view as viewed from the centrifugal impeller side. FIG. 5A is a view of the section CC shown in FIG. 4 as viewed from the direction of arrow A. FIG.
FIG. 5 is a view of the cross section CC shown in FIG. 4 as viewed from the direction of arrow A.

As shown in FIGS. 4, 5a and 5b,
The end bracket 9 is provided with ribs on both end surfaces in the long side direction, a rib 9a extending toward the centrifugal impeller 12 is provided on the end surface on the rotation inflow side of the end bracket 9, and the end surface on the rotation outflow side of the end bracket 9 is provided. And a rib 9b extending toward the motor 2 side.

In the present embodiment, due to the above structure, the flow of the air flowing on the motor 2 side of the end bracket 9 is divided into the A air flow path 21 and the C air flow since the rib 9b serves as a rectifying plate.
The flow guided to the space 23 is rectified in the axial direction by the rib 9b, so that the turbulence of the flow is reduced and the loss is reduced.

The rib 9b is formed by the return guide vane 14b and the end bracket guide 17 passing over the end bracket 9 by not extending to the both ends in the long side direction of the end bracket 9 as compared with the rib 9a. The flow of air in the E flow path 16b is not interfered by the rib 9b and does not cause separation.

Further, when the end bracket 9 is molded from engineering plastic, as shown in FIG. 6 in which the section CC shown in FIG. Since the height of 9b can be freely molded, the rigidity of the end bracket 9 is increased,
The whirling of the rotating shaft 4 and the vibration noise can be reduced.

In this embodiment, the case where the return guide is provided has been described. However, the present invention can reduce the flow loss regardless of the presence or absence of the return guide.

Next, another embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a stator mounting diagram of one embodiment according to the present invention. FIG. 8 is a partial vertical cross-sectional view of the electric blower taken along section DD shown in FIG.

On the side of the centrifugal impeller 12 of the stator 7, a partition plate 18 that connects a side of the stator 7 where a space is formed between the rotor 5, the stator 7 and the stator coil 6 to substantially inside the housing 3. Is located on the stator 7 and the partition plate 1
8 is configured such that the housing 3 side is located closer to the centrifugal impeller 12 than the rotor 5 side.

In the present embodiment, the D channel 1
6a and the flow of the air flowing out of the E flow path 16b may cause the space C 23 to be closed or the housing 3 and the partition plate 18 to be closed.
The C space 23 generated due to the gap between them has a small flow passage area. For this reason, the amount of air flowing into the A air flow path 21 increases, and the rotor 5, the stator coil 6, and the brush 15
The air volume of the air that effectively cools the air increases. Therefore, the efficiency of the electric motor is improved, and the efficiency of the electric blower is improved. Also,
The flow of air flowing through the D channel 16a and the E channel 16b is A
When flowing into the air flow path 21, the partition plate 18 serves as a guide wall, so that the flow of air flowing out of the D flow path 16a and the E flow path 16b is less likely to cause separation, and separation loss can be reduced, and the efficiency of the electric blower can be reduced. Is improved.

The ribs 3d are bent toward the inner peripheral side of the housing 3 in the vicinity of the partition plate 18 of the housing 3 and the concave portions are provided in the partition plate 18, so that the positioning at the time of manufacturing can be easily performed, and the individual electric motors can be electrically driven. Variations in the performance of the blower 308 can be reduced.

Next, FIG. 9 shows another embodiment of the present invention.
FIG. 9 is a view showing the mounting of a stator according to an embodiment of the present invention.

[0040] Stator 7, rotor 5 and stator coil 6
The cross-sectional area in the axial direction of the A air flow path 21 surrounded by the circle is defined by the outer peripheral surface 7b of the stator surface 7a constituting the axial cross-section.
And a structure having an axial cross-sectional area equal to or larger than a cross-section 24 surrounded by the inner peripheral surface of the housing 3.

In the structure of this embodiment, the amount of air flowing into the A air flow path 21 is larger than the amount of air flowing into the cross section 24. Therefore, the air volume of the air flowing into the A air flow path 21 increases, the rotor 5, the stator coil 6, and the brush 15 can be effectively cooled, the motor efficiency is improved, and the electric blower efficiency is improved.

[0042]

According to the present invention, the flow of the air flow path formed between the stator of the electric motor and the inner surface of the housing is guided after the swirl component of the flow is reduced in the return guide portion. Can be reduced, and the efficiency of the electric blower can be improved.

In addition, since the amount of air flowing through the air flow path formed in the gap between the rotor 5 and the stator 7 increases, the rotor, the stator coil, and the brush can be cooled, so that the motor efficiency can be improved. Thus, the efficiency of the electric blower can be improved.

The centrifugal impeller 12 of the end bracket
Since the flow of air flowing on the opposite side is rectified, turbulence of the flow is reduced, and loss can be reduced.

[Brief description of the drawings]

FIG. 1 is an embodiment of a vertical sectional view of an electric blower.

FIG. 2 is a return guide channel diagram of FIG.

FIG. 3 is a longitudinal sectional view of the electric blower at a section AOB shown in FIG. 2;

4 is a view of the end bracket of FIG. 3 as viewed from a centrifugal impeller side.

5 is a view of the section CC shown in FIG. 4 as viewed from the direction of arrow A.

6 is a view of the cross section CC shown in FIG. 4 as viewed from the direction of arrow A.

FIG. 7 is a mounting view of a stator according to an embodiment of the present invention.

8 is a partial vertical sectional view of the electric blower taken along section DD shown in FIG. 7;

FIG. 9 is a mounting view of a stator according to an embodiment of the present invention.

FIG. 10 is an embodiment of an external perspective view of the vacuum cleaner.

11 is a vertical sectional side view of a main body of the vacuum cleaner in the vacuum cleaner of FIG. 10;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... blower, 2 ... electric motor, 3 ... housing, 3c ... exhaust port, 3d ... rib, 5 ... rotor, 6 ... stator coil, 7
... stator, 7a ... stator surface, 7b ... stator outer peripheral surface, 9 ... end bracket, 9a ... rib, 9b ... rib,
DESCRIPTION OF SYMBOLS 10 ... Static flow path part, 11 ... Diffuser, 12 ... Centrifugal impeller, 13 ... Fan casing, 13a ... Air flow guide,
13b suction inlet, 14 return guide, 14a return guide vane, 14b return guide vane, 1
4c: Return guide vane, 14d: Return guide vane, 15: Brush, 16a: D flow path, 16b: E flow path, 17: End bracket guide, 18: Partition plate, 2
DESCRIPTION OF SYMBOLS 1 ... A air flow path, 22 ... B air flow path, 22a ... corner part, 23 ... C space, 24 ... cross section, 101 ... air, 102
... Air flow, 104 ... Air, 201 ... Vacuum cleaner body, 2
03: hose, 205: extension tube, 206: suction port, 301
... lower case, 302 ... upper case, 306 ... dust collection chamber, 30
7 ... Electric blower room, 308 ... Electric blower.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Fumio Joraku 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Prefecture Inside the Electrification Equipment Division, Hitachi, Ltd. 1-1-1 1-1 Hitachi Electric Co., Ltd.Electrical Equipment Division (72) Inventor Hideyuki Harada 1-1-1 Higashitagacho, Hitachi City, Ibaraki Pref. Hitachi Electric Co., Ltd.Electrical Equipment Division

Claims (4)

[Claims] 1. A vacuum cleaner having a centrifugal impeller directly connected to an electric motor, a return guide provided between the centrifugal impeller and the electric motor, and an electric blower having an end bracket attached to the electric motor. In the vacuum cleaner, of the return guide vanes of the return guide, a return guide vane passing over the end bracket, and a return guide vane forming a flow path where the flow is blocked by the end bracket, the wing trailing end substantially in the circumferential direction. A vacuum cleaner characterized in that the return guide vanes are oriented with the rear end of the wing oriented substantially in the axial direction. 2. A vacuum cleaner comprising, in a vacuum cleaner main body, a centrifugal impeller directly connected to an electric motor and an electric blower having an end bracket attached to the electric motor, wherein the end bracket has both ends in a long side direction. A rib provided on the surface, a rib provided on the centrifugal impeller side of the end face far from the rotation direction of the centrifugal impeller, and a rotation inflow side of the end bracket extends the rib extending toward the centrifugal impeller into the end. A vacuum cleaner wherein a rib extending from the rotation outflow side of the bracket is provided on the motor side. 3. A vacuum cleaner having a vacuum cleaner body including a centrifugal impeller directly connected to an electric motor, and an electric blower provided with an end bracket on the electric motor, wherein the stator of the electric motor has a centrifugal impeller side. Provided is a partition plate that connects the rotor, the stator, and a side of the stator on which a space is formed between the stator coils and a substantially inner side of the housing, and the housing side of the partition plate is compared with the rotor side, An electric vacuum cleaner configured to be located on the centrifugal impeller side. 4. A vacuum cleaner comprising a centrifugal impeller directly connected to a motor and an electric blower provided with an end bracket on the motor in a main body of the vacuum cleaner, wherein a stator, a rotor and a stator coil of the motor are used. A vacuum cleaner characterized in that the enclosed area in the axial direction is equal to or larger than the axial sectional area enclosed by the outer peripheral surface of the stator surface and the inner peripheral surface of the housing, which forms the axial cross section.