KR20080043684A - Electric blower and electric cleaner using the same - Google Patents

Abstract

An electric blower is provided to improve blow efficiency from an inlet to an outlet, and to increase the area of passage from the inlet to the outlet. An electric blower comprises an impeller(1), an inducer(8), an air guide(11), a casing(13) and an electric motor(14). The impeller has a front shroud(2), a rear shroud(3), and a plurality of blades(4) provided between the front and rear shrouds. The inducer has a hub(6) disposed in an inlet(5) of the impeller. The air guide is provided around an outer periphery of the impeller. The casing encloses the impeller and the air guide and has an intake opening(12) at the center. The electric motor rotates the impeller, wherein the area of a passage cross-section perpendicular to the center line of a passage from the inlet to an outlet(25) of the impeller that is defined by the front shroud, the rear shroud and the hub of the inducer, is monotonically increased from the inlet to the outlet.

Description

ELECTRIC BLOWER AND ELECTRIC CLEANER USING THE SAME

1 is a half sectional view of an electric blower according to Embodiment 1 of the present invention.

Figure 2 is a plan view showing a part of the impeller of the electric blower cut out

3 is a cross-sectional view of the impeller of the electric electric blower.

4A is a graph showing the relationship between the distance from the inlet on the flow path center curve of the impeller of the same electric blower and the cross-sectional area of the flow path perpendicular to the flow path center curve, and FIG. 4B is the distance from the inlet on the flow path center curve of the impeller. Graph showing the relationship of flow velocity parallel to the flow center curve

Fig. 5A is a graph showing the relationship between the distance from the inlet on the flow path center curve of the impeller of the electric blower in the second embodiment of the present invention and the flow path cross section perpendicular to the flow path center curve, and Fig. 5B is the flow path of the impeller. Graph showing the relationship between the distance from the inlet on the center curve and the flow velocity parallel to the channel center curve

6A is a graph showing the relationship between the distance from the inlet on the flow path center curve of another impeller and the flow path cross-sectional area perpendicular to the flow path center curve, and FIG. 6B is the distance from the inlet on the flow path center curve of the impeller and the flow path center curve. Graph showing the relationship of flow velocity parallel to

Fig. 7A is a cross-sectional view of the impeller of the electric blower according to the third embodiment of the present invention, and Fig. 7B is a graph showing the relationship between the distance from the inlet on the flow path center curve of the impeller and the flow path cross-sectional area perpendicular to the flow path center curve.

Fig. 8A is an exploded cross-sectional view showing the impeller shape of the electric blower according to the fourth embodiment of the present invention, and Fig. 8B is a graph showing the relationship between the distance from the inlet on the flow path center curve of the impeller and the flow path cross section perpendicular to the flow path center curve.

9 is a cross-sectional view of the vacuum cleaner according to the fifth embodiment of the present invention.

10 is a cross-sectional view of an impeller in a conventional electric blower.

Fig. 11A is a graph showing the relationship between the copper impeller diameter and the passage cylinder cross-sectional area, and Fig. 11B is a graph showing the relationship between the copper impeller diameter and the radial flow velocity.

(Explanation of symbols for the main parts of the drawing)

1: impeller 2: front shroud

3: rear shroud 4: blade

5: inlet 6: hub

7: Entrance guide wing 8: Inducer

9: stator 10: substrate

11: air guide 12: intake hole

13: case 14: electric motor

16: rotating shaft 25: outlet

26: hub end 27: curve change portion

28: parallel part 30: electric blower

Patent Document 1: Japanese Patent Publication No. 2006-9669

The present invention relates to an electric blower aimed at improving the impeller blowing efficiency and an electric vacuum cleaner using the same.

Conventionally, the electric blower which aimed at improving this kind of impeller blowing efficiency is already proposed (for example, refer patent document 1).

10, the impeller 40 is comprised by the front shroud 41, the back shroud 42, and the some blade 43 between both shrouds. And, the shape of the front shroud 41 is such that the distance from the front shroud 41 to the rear shroud (substrate) 42 becomes shorter from the center to the outer periphery) (a> b> c> d) front shroud 41 Is inclined, and the cross-sectional shape of the front shroud 41 in the radial direction is curved. Thereby, as shown in FIG. 11A, the cylindrical cross-sectional area of the flow path in a radial direction increases linearly from the inner diameter to the outer diameter (from the flow path inlet to the flow path outlet) of the impeller 40, and is shown in FIG. 11B. Similarly, the change in the flow velocity in the radial direction decreases linearly from the flow path inlet to the flow path outlet.

However, in the conventional configuration, the front shroud is opened at the inlet portion of the impeller 40 in which the airflow sucked is bent in the radial direction from the rotation axis direction, and the distance between the front shroud 41 and the rear shroud 42 and the front face are changed. Since only the curved shape of the shroud 41 cannot obtain the linear relationship resulting from the impeller outer diameter to the inlet, there is a problem that a flow path cross-sectional area for achieving sufficient impeller blowing efficiency can not be formed.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an electric blower capable of sufficiently improving the impeller blowing efficiency from the inlet to the outlet and an electric vacuum cleaner using the same.

In order to solve the above problems, the electric blower of the present invention is provided with an inductor having a hub in the impeller, the flow path perpendicular to the flow path from the inlet to the outlet formed from the front shroud and the rear shroud and the hub of the inducer In the cross section, the area of the flow path cross section is monotonically increased from the inlet to the outlet.

As a result, the flow velocity due to the flow rate inside the impeller gradually decelerates over the entire flow path region from the inlet to the outlet and does not repeat acceleration or deceleration, so that sufficient blowing efficiency can be improved.

Moreover, the vacuum cleaner using this electric blower has a high suction performance and can perform a comfortable cleaning.

A first invention includes an impeller having a plurality of blades between a front shroud, a rear shroud and both shrouds, an inducer having a hub disposed inside the inlet of the impeller, an air guide located at an outer circumference of the impeller, and the air guide And a case having an impeller and having an intake hole at the center thereof, and an electric motor for rotationally driving the impeller, with respect to a flow center from an inlet to an outlet formed from the front shroud and the rear shroud and the hub of the inducer. In the orthogonal flow path cross section, the flow rate caused by the flow rate inside the impeller is gradually decelerated over the entire flow path area from the inlet to the outlet by setting the area of the flow path cross section to the electric blower monotonically increasing from the inlet to the outlet. Because we do not repeat acceleration and sudden deceleration, Improvement is planned.

2nd invention especially in 1st invention WHEREIN: Forging increase of a flow path cross section is substantially linear shape, and the flow velocity of the component resulting from the flow volume inside an impeller is decelerated by a fixed ratio with respect to the flow direction of a rotating shaft cross section. It does not cause a sudden deceleration.

The third invention, in particular, in the first or second invention, the monotonous increase in flow path cross-sectional area is different from the inlet to the hub end and from the hub end to the outlet by varying the forging end from the inlet to the hub end, Forging can be designed by separating from the end to the outlet, and forging of the flow path area to reduce the loss due to the vortex due to the separation of the flow or the secondary flow caused when the suctioned flow is changed from the rotation axis direction to the radial direction. On the outlet side, the forging increases the cross-sectional area of the flow path to reduce the loss due to the vortex due to the separation of the flow that occurs until discharge in the radial direction or the rotational friction between the impeller surface and the air (the loss of the disk rotation friction). In this way, it is possible to improve the blowing efficiency.

In the fourth invention, in particular, in the third invention, the forging increase in the flow path cross-sectional area from the inlet to the hub end of the impeller is such that the change rate is larger than the forging increase in the flow cross-sectional area from the hub to the outlet. By correcting the case where the area where air flows actually decreases due to the vortex due to the separation of the flow generated when the flow drawn in is changed from the rotational axis direction to the radial direction or the secondary flow, the forging of the flow path area actually flows. The increase can be approximated to a straight line, and the flow velocity of the component due to the flow rate inside the impeller decelerates at a constant rate with respect to the flow direction of the cross section of the rotating shaft, thereby not causing rapid deceleration.

In the fifth invention, in particular, in the first invention, the monotonous increase in the cross-sectional area of the flow path is different at the hub end at the inlet of the impeller and at the outlet at the hub end, and each is substantially straight, and the inlet is near the hub end. By providing a curved change portion that connects the forging increase in the flow path cross-sectional area on the side and the outlet side, the flow path cross-sectional area is smoothly changed from the inlet to the hub end and the hub end to the outlet, i.e., the component due to the flow rate. Can smoothly reduce the flow rate.

In particular, in the sixth invention, in any one of the first to fifth aspects, the impeller has the front shroud and the inlet portion of the hub, respectively, in parallel with the rotation axis direction so as to be sucked in the rotation shaft direction at the impeller inlet. The flow in the rotational axis direction can be smoothly changed into the flow in the radial direction.

In particular, in the seventh aspect of the invention, the inducer is made of resin, and the front shroud, the rear shroud, and the blade are made of sheet metal. The negative flow path and the flow path of the sheet metal part on the outlet side (the flow path disposed between the front shroud and the rear shroud) can be produced separately, so that the impeller can be easily configured.

In particular, the eighth invention is a vacuum cleaner having the electric blower according to any one of the first to seventh inventions, and thus the suction performance is high and the cleaning can be performed comfortably.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described, referring drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)

1-4B show the electric blower in Embodiment 1 of this invention.

As shown in Figs. 1 and 2, the electric blower in the present embodiment has an impeller having a plurality of blades 4 between the front shroud 2, the rear shroud 3, and both shrouds 2, 3 ( 1) and an inducer having a cone-shaped hub 6 arranged inside the inlet 5 of the impeller 1 and an inlet guide blade 7 having a three-dimensional curved surface and connected to the blade 4 ( 8), an air guide 11 having a plurality of stator blades 9 and a substrate 10 positioned on an outer circumference of the impeller 1, and an impeller 1 together with the air guide 11; ) And a case 13 having an intake hole 12 facing the inlet 5 at the center thereof, and an electric motor 14 for rotationally driving the impeller 1.

And a flow path cross section perpendicular to the flow path from the inlet 5 to the outlet 25 resulting from the front shroud 2 and the rear shroud 3 of the impeller 1 and the hub 6 of the inducer 8. WHEREIN: It is set as the structure which expanded continuously, without narrowing the area of this flow path cross section, and forging increasing structure in the so-called wide meaning.

In addition, the front shroud 2, the back shroud 3, and the some blade 4 which comprise the impeller 1 are all made of sheet metal in this embodiment, and these three components are fastened by caulking etc. In addition, the inducer 8 is made of resin, and is inserted inside and fastened together when fastening three parts made of sheet metal (front shroud 2, rear shroud 3, and blade 4). The inducer 8 is connected to the impeller 1 at its hub end 26, and the inlet guide blade 7 is connected to each blade 4.

In addition, the impeller 1 has a shaft insert 15 in the rear shroud 3 and the hub 6 fixed to the rotation shaft 16 of the electric motor 14 with a nut 18 via a washer 17. It is.

In this impeller 1, the axis of rotation 16 of the flow path from the inlet 5 to the outlet 25 resulting from the front shroud 2 and the rear shroud 3 and the hub 6 of the inducer 8. The cross-sectional shape in the direction (magnetism surface shape) is configured as shown in FIG. 3.

That is, as the front curve 19 on the flow path side when the cross section of the front shroud 2 in the direction of the rotation axis 16 is taken, the hub 6 and the rear shroud 3 continuous from the hub 6 are similarly formed. It arrange | positions between the back side curve 20 of the flow path side formed, and is many perpendicular | vertical to the flow path center curve 21 which passes through the substantially center between these two curves (front side curve 19 and back side curve 20). The flow path cross section defining straight line 22 is calculated | required, and the annular curved surface rotated about the rotating shaft 16 via this flow path cross section defining straight line 22 is made into the flow path cross section area in each location.

The flow path cross-sectional area at each of these locations is monotonically increased from the inlet 5 on the flow path center curve 21 of the impeller 1 to the outlet 25, and as shown in Fig. 4A, the change is substantially linear. To be Thereby, as shown in FIG. 4B, the change of the flow velocity from the inlet 5 to the outlet 25 reduces linearly.

In addition, the flow path center curve 21 divides the front curve 19 and the back curve 20 by the same number, connects the corresponding split points 23, respectively, and the connected split lines 24 are connected. The curve passes through the midpoint of.

The operation and action of the electric blower configured as described above will be described below.

1 and 2, the impeller 1 connected to the electric motor 14 rotates at a high speed (arrow A), sucks air from the intake hole 12 of the case 13 (arrow B), and then Air is drawn in from the inlet 5 of the impeller 1, which flows in the direction of the axis of rotation 16 in the inner flow passage surrounded by the front shroud 2, the hub 6, and the two inlet guide wings 7. From the outer periphery of the impeller (1), bending radially from (arrow C), passing through the inner channel surrounded by a continuous front shroud (2), rear shroud (3), and two blades (arrow D). Discharged.

The air flow discharged from the impeller 1 passes between the stator blades 9 of the air guide 11 and collides with the outer circumferential wall of the case 13 (arrow E), and also the rear surface of the air guide 11 ( Arrow F) Then, while cooling the inside of the electric motor 14, it passes (arrow G), and is discharged | emitted out of the electric motor 14 from the exhaust hole provided in the electric motor 14 (arrow H).

At this time, in the flow path cross section orthogonal to the flow path from the inlet 5 to the outlet 25 resulting from the front shroud 2 and the rear shroud 3 and the hub 6 of the inducer 8, As the area of the flow path cross section is monotonically increased, the flow velocity of the component (component in the cross-sectional direction of the rotating shaft 16) due to the flow rate inside the impeller 1 is applied to the entire flow path region from the inlet 5 to the outlet 25. Slowly decelerate continuously over time (FIG. 4B), and it does not generate a sudden deceleration.

As described above, in the present embodiment, from the inlet 5 to the outlet 25 resulting from the front shroud 2 and the rear shroud 3 of the impeller 1 and the hub 6 of the inducer 8. In the flow path cross section orthogonal to the flow path, the flow rate of the component (component in the cross-sectional direction of the rotating shaft 16) due to the flow rate inside the impeller 1 is formed by the configuration in which the area of the flow path cross section is monotonously increased. Slowly decelerating over the entire flow path region from (5) to the outlet 25 and no rapid deceleration is generated, so that sufficient blowing efficiency can be improved.

In addition, as forging increase of the flow path cross-sectional area is substantially linear, as shown in FIG. 4A, the flow velocity of the component (component of the rotating shaft 16 cross-sectional direction) resulting from the flow volume inside the impeller 1 is a cross section of the rotating shaft 16. As shown in FIG. By decelerating at a constant rate with respect to the flow direction of, the rapid deceleration does not occur.

(Embodiment 2)

Next, Embodiment 2 of this invention is demonstrated based on FIG. 5A, 5B, 6A, and 6B. Since the basic structure of an electric blower is the same as that of Embodiment 1, the description is abbreviate | omitted.

In this embodiment, as shown to FIG. 5A, the flow path cross-sectional area change of the impeller 1 differs in the hub end part 26 from the inlet part 5 of the impeller, and the outlet 25 from the hub end part 26. As shown to FIG. Thereby, as shown in FIG. 5B, the flow velocity from the inlet 5 parallel to the flow path center curve 21 of the impeller 1 to the outlet 25 changes.

As described above, in the present embodiment, the inlet 5 to the hub end 26 and the hub end 26 to the outlet 25 can be separated and designed, and the flow sucked from the inlet 5 side When forging increases in the cross-sectional area of the flow path to reduce the loss caused by the vortex due to the separation of the flow generated when changing in the radial direction in the direction of the rotation axis 16, the secondary flow or the like, and discharged in the radial direction from the outlet 25 side By forging an increase in the cross-sectional area of the flow path to reduce the loss due to the vortex due to the separation of the flow generated up to, or the rotational friction of the surface of the impeller 1 and the air (rotational friction loss of the disc), etc., to improve the blowing efficiency.

In addition, in this embodiment, the forging of the flow path cross-sectional area from the inlet 5 of the impeller 1 to the hub end 26 is increased to the forging of the flow path cross-sectional area from the hub end 26 to the outlet 25. The change rate is large compared with the structure.

This corrects the case where the area where air actually flows becomes small due to the influence of vortices due to the separation of the flow that occurs when the sucked flow changes from the rotational axis 16 in the radial direction and the secondary flow, so that the air actually flows. The monotonous increase of the flow path cross-sectional area can be approximated to a straight line, and the flow velocity of the component (component in the cross-sectional direction of the rotating shaft 16) due to the flow rate inside the impeller 1 is constant with respect to the flow direction of the cross section of the rotating shaft 16. Deceleration at a rate does not cause rapid deceleration.

In addition, in this embodiment, as shown to FIG. 6A and FIG. 6B, forging increase of the cross-sectional area of the flow path of the impeller 1 is near the upstream side A1 of the hub terminal part 26 from the inlet 5 of the impeller 1. And at the outlet 25 from the downstream side A2 of the hub end portion 26, and each is substantially linear, and is also near the upstream side A1 and the downstream side of the hub end portion 26 ( Between A2), it has the curve change part 27 which connects the forging increase of the substantially linear flow path cross section area of the inlet 5 side and the outlet 25 side.

As a result, the flow path cross-sectional area is smoothly monotonously increased from the inlet 5 of the impeller 1 to the hub end 26 and from the hub end 26 to the outlet 25, i.e., a component due to the flow rate ( The flow velocity of the component in the cross-sectional direction of the rotating shaft 16 can be smoothly reduced.

(Embodiment 3)

Next, Embodiment 3 of this invention is demonstrated based on FIG. 7A and 7B. Since the basic structure of an electric blower is the same as that of Embodiment 1, the description is abbreviate | omitted.

In this embodiment, as shown to FIG. 7A and FIG. 7B, the impeller 1 is the parallel part 28 substantially parallel to the direction of the rotation axis 16 in the vicinity of the edge part of the inlet 5 of the front shroud 2 and the hub 6. ) And each has an annular intake passage parallel to the rotating shaft 16.

Thereby, the aberration at the time of aspiration can be reduced by sucking in the direction of the rotation shaft 16 from the inlet of the impeller 1, and after that, the flow in all the rotation axis 16 directions can be smoothly changed into the flow of a radial direction.

(Embodiment 4)

Next, Embodiment 3 of this invention is described based on FIG. 8A and 8B. Since the basic structure of an electric blower is the same as that of Embodiment 1, the description is abbreviate | omitted.

FIG. 8A shows the inducer, and FIG. 8B shows the state before the inducer is inserted into the impeller.

In the present embodiment, the inductor 8 constituting the impeller 1 is made of resin, and the front end shroud 2, the back shroud 3, and the blade 4 are made of sheet metal, so that the hub end portion 26 is formed. The flow path cross-sectional area in the cross section is obtained from a cross section parallel to the rotation axis 16 direction. That is, when the rear shroud 3 is perpendicular to the rotation axis 16, the flow path cross section defining straight line 22 at the hub end portion 26 (boundary guide blade 7 and the boundary of the blade 4). Has a configuration perpendicular to the rear shroud (3).

Thereby, between the flow path of the inducer 8 part on the inlet 5 side of the impeller 1 and the flow path of the sheet metal part on the outlet 25 side (between the front shroud 2 and the rear shroud 3). Arranged flow path) can be manufactured individually, and the impeller 1 can be comprised easily.

(Embodiment 5)

9 shows an electric vacuum cleaner according to the fifth embodiment of the present invention.

As shown in the figure, it has the electric blower 30 in the cleaning main body 29, draws a dust together with airflow from the suction nozzle 31, and accumulates the dust in the dust collecting chamber 32. As shown in FIG.

Here, by using any one of the electric blowers shown in the first to fourth embodiments as the electric blower 30, the suction performance can be improved, and further, an electric vacuum cleaner with reduced energy consumption can be realized.

(Industrial availability)

As mentioned above, since the electric blower which concerns on this invention is aimed at the improvement of sufficient blowing efficiency, it can be applied widely not only as an electric vacuum cleaner but also uses for other home telephone apparatuses, industrial equipment, etc. Electric blowers are also applicable to compressors, turbines, and liquid pumps in the same respect.

The electric blower and the vacuum cleaner using the same of the present invention are intended to sufficiently improve the blowing efficiency.

Claims (8)

An impeller having a plurality of blades between the front shroud, the rear shroud and both shrouds, an inducer having a hub disposed inside the inlet of the impeller, an air guide located at the outer periphery of the impeller, and an impeller together with the air guide. And a case having an intake hole in the center, and an electric motor for rotationally driving the impeller, and a flow path section perpendicular to the flow center from the inlet to the outlet formed from the front shroud and the rear shroud and the hub of the inducer. The electric blower according to claim 1, wherein the area of the flow path cross section is monotonically increased from the inlet to the outlet. The method of claim 1, The forged increase in the cross-sectional area of the flow passage is an electric blower of approximately linear shape. The method according to claim 1 or 2, The forging increase in the flow cross section is different from the inlet of the impeller to the hub end and from the outlet to the outlet of the other electric blower. The method of claim 3, wherein An electric blower in which the increase in forging of the flow path cross-sectional area from the inlet to the hub end of the impeller is larger in change rate than the increase in forging of the flow cross-sectional area from the hub to the outlet. The method of claim 1, The monotonous increase in flow path cross-sectional area is different at the hub end from the inlet of the impeller and at the outlet from the hub end, and each is approximately linear, and the forging increase in the flow path cross-sectional area at the inlet and outlet sides is connected near the hub end. An electric blower having a curved change section to make. The method according to any one of claims 1 to 5, An impeller is an electric blower having a parallel portion parallel to the direction of the rotation axis at the inlet of the front shroud and the hub. The method according to any one of claims 1 to 6, Electric blower with resin made of inducer and sheet metal with front shroud, rear shroud and blade. An electric vacuum cleaner having the electric blower according to any one of claims 1 to 7.

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