WO2023075116A1

WO2023075116A1 - Impeller and cleaner using same

Info

Publication number: WO2023075116A1
Application number: PCT/KR2022/013059
Authority: WO
Inventors: 타카다마사유키; 요시다미노루
Original assignee: 삼성전자 주식회사
Priority date: 2021-10-29
Filing date: 2022-08-31
Publication date: 2023-05-04
Also published as: JP2023067008A

Abstract

The disclosed impeller is disposed in an air passage so as to suction and discharge air while rotating. The impeller comprises: a boss part fixed to a shaft of an electric motor; a base part, which is connected to the boss part and has a diameter that becomes larger from the intake side of the air passage toward the discharge side thereof; and a plurality of blades radially arranged at the base part so as to generate suction force at the intake side of the air passage. Each of the plurality of blades has a wind-blocking edge that is close to the boss part and a blowing edge that is far from the boss part. The wind-blocking edge has the shape of a sweptback wing. The protruding end of the wind-blocking edge is positioned closer than the base end of the wind-blocking edge to the intake side with respect to the air passage.

Description

Impeller and vacuum cleaner using the same

The disclosed technology relates to an impeller and a cleaner using the same.

Recently, many small and lightweight stick-type vacuum cleaners in which a cleaner body, a hose, an electric cord, and the like are omitted are being released. These vacuum cleaners are popular because they are cordless and easy to handle.

The stick type vacuum cleaner is equipped with a small impeller with a diameter of about 3 to 5 cm. In order to generate high suction force with such a small impeller, a motor that rotates and drives the impeller is also small and lightweight and can rotate at a high speed of 50000 r/min or more while securing a certain amount of torque.

Japanese Patent No. 3724413 and Japanese Unexamined Patent Publication No. 2017-82759 disclose small impellers employed in such vacuum cleaners.

A cleaner according to an aspect of the present disclosure includes a main body and a dust case connected to the main body. A filter chamber and an exhaust chamber are provided in the main body. The impeller is disposed in the main body and rotates to generate a suction force so that air is sucked from the dust case to the main body through the air passage. The impeller is rotated by a fan motor.

An impeller according to one aspect of the present disclosure includes a boss portion fixed to a shaft of a fan motor, a base portion connected to the boss portion and having a diameter gradually increasing from a suction side to a discharge side of an air passage, and radially disposed on the base portion. It is provided with a plurality of blades that generate a suction force on the suction side of the air path. Each of the plurality of blades has a wind blowing edge close to the boss and a blowing edge far from the boss. The windblown edge has a proximal end, which is an end on the side of the base portion, and a protruding end, which is an end opposite to the base end. The windblown edge has a swept wing shape. In other words, based on the rotational direction of the impeller, the protruding end of the wind-blast edge is located behind the proximal end of the wind-blast edge. In addition, with respect to the air path, the protruding end of the wind blowing edge is located on the suction side rather than the base end of the wind blowing edge.

1 is a schematic diagram showing main parts of a stick-type cleaner according to an embodiment of the present disclosure.

2 is a schematic internal structural diagram of a body part according to an embodiment of the present disclosure.

3 is a perspective view and a schematic cross-sectional view showing the structure of an impeller according to an embodiment of the present disclosure.

4 is a view for explaining the structure of an impeller according to an embodiment of the present disclosure, as viewed from the suction side of the impeller.

5 is a schematic diagram of an example of a model of fluid analysis of an impeller according to an embodiment of the present disclosure.

6 is a graph showing an example of a relationship between an inclination angle of a wind blade edge and suction efficiency according to a result of fluid analysis.

7 is a diagram showing an example of a fluid analysis result according to a receding angle of a wind blade edge.

8 is a graph showing an example of a relationship between a receding angle of a wind blade edge and suction efficiency according to a result of fluid analysis.

9 is a schematic diagram of a stick-type cleaner according to an embodiment of the present disclosure.

The terms used in this specification have been selected from general terms that are currently widely used as much as possible while considering the functions in the present invention, but these may vary depending on the intention of a person skilled in the art, precedent, or the emergence of new technologies. In addition, in a specific case, there is also a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the invention. Therefore, the term used in the present invention should be defined based on the meaning of the term and the overall content of the present invention, not simply the name of the term. When it is said that a certain part "includes" a certain component throughout the specification, it means that it may further include other components without excluding other components unless otherwise stated.

Hereinafter, an impeller according to the present disclosure and an embodiment of a vacuum cleaner employing the same will be described in detail so that those skilled in the art can easily carry out the impeller. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

1 is a schematic diagram showing main parts of a stick-type cleaner according to an embodiment of the present disclosure. Hereinafter, the stick-type cleaner is simply referred to as the cleaner 1 . The vacuum cleaner 1 may be of a wireless type.

In the vacuum cleaner 1, an impeller (FIG. 2: 20) according to an embodiment of the present disclosure is mounted. The cleaner 1 according to an embodiment of the present disclosure may include a main body 3 and a dust case 4 connected to the main body 3 . The cleaner 1 according to an embodiment of the present disclosure may further include a pipe part 2 and a handle part 5.

The pipe part 2 may be an elongated tubular member. Although not shown, the head of the vacuum cleaner 1 that sucks dust is mounted on one end (not shown) of the pipe part 2. The other end of the pipe part (2) is connected to the dust case (4). The body portion 3 and the handle portion 5 may be integrally installed with the proximal end portion of the pipe portion 2. A suction unit (Fig. 2: 10) to be described later is housed in the body portion 3. Although not shown, a battery, a controller, etc. may be accommodated in the handle part 5 . The controller controls driving of the suction unit 10 . The battery may be a rechargeable secondary battery and supplies electrical energy to the suction unit 10 . The handle part 5 is a part that the user grips. The cleaner 1 according to an embodiment of the present disclosure is configured so that the user can handle the handle part 5 while holding it with one hand.

A dust case 4 is installed on the lower side of the body portion 3. The dust case 4 is detachable from the body part 3. When the suction unit 10 is driven, a strong suction force is generated in the head. Accordingly, the dust sucked from the head is accumulated in the dust case 4 through the pipe part 2.

Figure 2 is a schematic internal structural diagram of the body portion 3 according to an embodiment of the present disclosure. FIG. 2 shows the internal structure of the portion surrounded by the line L1 in FIG. 1 . In addition, in FIG. 2, the diffuser 15 is shown in an external shape on the left side and a cross-sectional shape on the right side with respect to the rotation axis (A).

The body portion 3 may include an exhaust chamber 30, a filter chamber 31, and the like. The exhaust chamber 30 may be a cylindrical space with one end closed, and a plurality of inner exhaust holes 30a are formed on its outer circumference. The filtration chamber 31 is arranged so as to surround the periphery of the exhaust chamber 30 . In the filtration chamber 31, a cylindrical filter 32 for trapping dust is disposed over its entire circumference. A plurality of external exhaust holes 33 are formed in the cover 34 of the body portion 3 forming the outer circumferential boundary of the filter chamber 31, as shown in FIGS. 1 and 2 . The suction unit 10 is housed inside the body portion 3 in a state in which a portion thereof is partially retracted into the exhaust chamber 30 .

The suction unit 10 may include a fan motor (electric motor) 13 and an impeller 20 . The impeller 20 is disposed on the main body 3 and rotates to generate a suction force so that air is sucked into the main body 3 from the dust case 4 through the air path 50 . The fan motor 13 rotates the impeller 20 . The fan motor 13 and the impeller 20 may have a common rotation axis A. The suction unit 10 may include an upstream side shroud 11 and a downstream side shroud 12 forming a flow path (air path 50) through which air flows.

The upstream shroud 11 is a cylindrical member, and includes a first large-diameter portion 11a having a large diameter and a first reduced-diameter portion 11b extending from the first large-diameter portion 11a to gradually narrow in diameter. Based on the air flow direction Y1, the first reduced-diameter portion 11b is located on the downstream side of the first large-diameter portion 11a. The diameter of the first reduced-diameter portion 11b extends from the first large-diameter portion 11a toward the air flow direction Y1.

The downstream shroud 12 is also a cylindrical member, and includes a second large-diameter portion 12a having a large diameter and a second reduced-diameter portion 12b extending from the second large-diameter portion 12a to gradually narrow in diameter. Based on the air flow direction Y1, the second reduced-diameter portion 12b is located upstream of the second large-diameter portion 12a. With the air flow direction Y1 as a reference, the diameter of the second reduced diameter portion 12b gradually increases, and the second large diameter portion 12a extends from the downstream end of the second reduced diameter portion 12b. . The second large-diameter portion 12a is connected to the exhaust chamber 30 . Based on the direction opposite to the air flow direction Y1, the second diameter-reduced portion 12b extends from the second large-diameter portion 12a to a gradually smaller diameter in the opposite direction to the air flow direction Y1. , connected to the first diameter reduction portion 11b. The first diameter of the first large-diameter portion 11a and the second diameter of the second large-diameter portion 12a may be the same or different.

The first reduced diameter portion 11b of the upstream shroud 11 is connected to the second reduced diameter portion 12b of the downstream shroud 12 . In the embodiment of the present disclosure, the upstream side shroud 11 and the downstream side shroud 12 are integrally aligned in a centered state. The first large-diameter portion 11a is connected to the dust case 4, and the upstream shroud 11 and the dust case 4 communicate with each other. The downstream shroud 12 is disposed inside the exhaust chamber 30 .

The fan motor 13 directs its shaft 13a toward the downstream shroud 12 side, and is housed in the upstream shroud 11 in a state where the center of the upstream shroud 11 and the rotational axis A coincide. has been The fan motor 13 is very small. For example, in the case of the fan motor 13 according to an embodiment of the present disclosure, the outer diameter is about 70 mm and the height is about 40 mm (so-called palm size). Therefore, its weight is also very light. The fan motor 13 has a structure capable of obtaining high efficiency and high output so as to obtain sufficient performance that can be used in the vacuum cleaner 1 using battery power. For example, in the case of the fan motor 13 according to an embodiment of the present disclosure, it can be driven at high-speed rotation of 50000 r/min or more, and even ultra-high-speed rotation of 100000 r/min or more with power consumption of 600 W, and has a suction power of 250 W or more. It has a structure that can be obtained.

The impeller 20 is disposed in the air passage 50, for example, in the second diameter reduced portion 12b. The impeller 20 is accommodated in the second diameter reduced portion 12b. The impeller 20 includes a boss portion 21 fixed with the rotation shaft A aligned with the shaft 13a of the fan motor 13, and an annular base portion extending from the boss portion 21 to the surroundings ( 22) and a plurality of blades 23 disposed on the upper surface of the base portion 22. This disclosure focuses on the structure of the impeller 20 in particular. A detailed structure of the impeller 20 will be described later.

The suction unit 10 may have a diffuser 15 . The diffuser 15 is located downstream of the impeller 20 . For example, the diffuser 15 is housed in the second large-diameter portion 12a of the downstream shroud 12 . The diffuser 15 according to an embodiment of the present disclosure has a two-stage structure of an upper diffuser 15U and a lower diffuser 15D. Depending on the specifications of the suction unit 10, it may be a diffuser 15 having a one-stage structure.

Each of the upper diffuser 15U and the lower diffuser 15D may be a cylindrical member, and a plurality of vanes 15a extending obliquely with respect to an axial direction (eg, a rotation axis A) are formed on an outer circumferential surface of each. The inclination angle of the vane 15a of the lower diffuser 15D is smaller than that of the upper diffuser 15U. Each of the upper diffuser 15U and the lower diffuser 15D is fixed to the inner circumferential surface of the second large-diameter portion 12a.

When the fan motor 13 is driven to rotate while the vacuum cleaner 1 is running, the impeller 20 rotates at a high speed in a predetermined rotation direction. Accordingly, as indicated by arrow Y1, air flows from the dust case 4 into the upstream shroud 11, and a suction force is generated on the upstream side of the second diameter reduction portion 12b. The air introduced into the upstream shroud 11 passes through the first large-diameter portion 11a and the first reduced-diameter portion 11b while cooling the fan motor 13 and is sucked into the second reduced-diameter portion 12b. .

The air introduced into the second diameter reduced portion 12b from the suction side 50a is the space between the inner wall surface 12c of the second reduced diameter portion 12b and the base portion 22 of the impeller 20 ( Specifically, it passes through the blades 23) and is discharged from the second reduced-diameter portion 12b and introduced into the second large-diameter portion 12a. The air introduced into the second large-diameter portion 12a from the discharge side 50b of the second diameter-reduced portion 12b passes through the inner wall surface of the second large-diameter portion 12a and the upper diffuser 15U and the lower diffuser 15D. It passes through the space between the outer peripheral surfaces (specifically, between the vanes 15a) and flows into the exhaust chamber 30.

By passing through the upper diffuser 15U and the lower diffuser 15D, air flows into the exhaust chamber 30 in a rectified state in the axial direction as indicated by arrow Y2. The air that has flowed into the exhaust chamber 30 flows out to the filter chamber 31 through the inner exhaust hole 30a, passes through the filter 32, and then passes through the outer exhaust hole 33 as indicated by arrow Y3. ) through which it is exhausted out of the main body part (3).

High-speed rotation of the fan motor 13 may be performed in order to realize a higher suction force, and accordingly, performance of the impeller 20 is also required. The present disclosure provides a small impeller 20 suitable for a stick type vacuum cleaner 1 and capable of improving a suction force.

3 is a perspective view and a schematic cross-sectional view showing the structure of an impeller 20 according to an embodiment of the present disclosure. 4 is a view for explaining the structure of the impeller 20 according to an embodiment of the present disclosure, and is a view of the impeller 20 viewed from the suction side 50a. As described above, the impeller 20 includes a boss portion 21, a base portion 22, and a plurality of blades 23. For convenience, in the description, as shown in FIG. 3, the protruding end 21a side of the boss 21, that is, the suction side 50a of the air path 50 is referred to as the 'upper side', and the opposite side is referred to as the 'lower side. '.

Specifically, the impeller 20 has a boss portion 21 fixed to the shaft 13a, and while being connected to the boss portion 21, it goes from the suction side 50a of the air path 50 to the discharge side 50b. Equipped with an annular base portion 22 whose diameter increases according to the diameter, and a plurality of blades 23 radially disposed on the upper surface of the base portion 22 to generate a suction force on the suction side 50a of the air passage 50. do. The impeller 20 may be a resin molded product, and the boss portion 21, the base portion 22, and the plurality of blades 23 may be integrally formed.

The impeller 20 rotates counterclockwise by driving the fan motor 13 when viewed from above, as indicated by arrows Yr in FIGS. 3 and 4 . And, each blade 23 of the impeller 20 has its outer peripheral side, for example, the blowing edge 23b is located behind its center side, for example, the wind blowing edge 23a, with respect to the rotation direction Yr. It is inclined and may have a structure in which air escapes between the blades 23 in an inclined direction with respect to the rotation axis A during rotation. Such a blade 23 may be referred to as a blade having a mixed-flow fan structure. That is, the impeller 20 corresponds to a mixed flow fan.

The boss part 21 is a cylindrical part, and the shaft 13a is fixed to the center thereof. The base portion 22 is a conical portion connected to the upper portion of the boss portion 21, and its upper surface gradually moves toward the outer circumferential side in the radial direction from the boss portion 21 toward the discharge side 50b of the air passage 50. it is inclined The inclination of the upper surface of the base portion 22 is about 30°, and may range from about 20° to 40°.

Each blade 23 is a thin-plate-like part and protrudes upward from the upper surface of the base 22 . The impeller 20 according to an embodiment of the present disclosure has nine blades 23, and these blades 23 are arranged at equal intervals in the circumferential direction. Each blade 23 has a band-like appearance in which one (23a) is long and the other (23b) is very short among two edges (23a, 23b) in the radial direction, and two edges (edges) in the vertical direction One (23e) of (23e, 23f) is connected to the base portion (22). Of the two

edges

23a and 23b in the radial direction, the longer one (wind cutting edge) 23a is located on the center side of the base portion 22, that is, close to the boss portion 21, and the shorter one (wind cutting edge) An edge (wind sending edge) 23b is located on the outer circumferential side of the base portion 22, that is, away from the boss portion 21.

Each of the windblown edge 23a and the blowing edge 23b extends from the edge 23e in the vertical direction, for example, in a straight line. Each blade 23 has a twisted shape from the wind cutting edge 23a toward the blowing edge 23b. The protruding end 23d side of the wind blowing edge 23a is twisted and inclined in the direction of rotation, and the protruding end 23g side of the blowing edge 23b is twisted and inclined in the opposite direction of rotation. As shown in FIG. 4, the windblown edge 23a is formed to extend in the axial direction, that is, in the radial direction when viewed from the top. Accordingly, the protruding vertical edges 23f of each blade 23 follow the inner circumferential surface of the second diameter-reducing part 12b with a slight gap between them and the inner circumferential surface of the second diameter-reducing part 12b. is extended

The windblown edge 23a has a base end 23c and a protruding end 23d. The base end 23c is an end on the side of the base portion 22, and the projecting end 23d is an end opposite to the base end 23c. In the case of the impeller 20 according to an embodiment of the present disclosure, in each blade 23, the protruding end 23d side of the wind-blast edge 23a is more rotated than the base end 23c side of the wind-blast edge 23a. It has a shape located at the back (herein, this shape is called a swept wing shape for convenience). The air resistance of the blade 23 is reduced by adopting a swept wing shape, which is advantageous for high rotation.

In addition, the present inventors have analyzed the swept wing shape by fluid analysis to determine the swept angle θ2 (to the second reference line RL2 in the radial direction passing through the center of rotation of the impeller 20 and the base end 23c of the wind blade edge 23a). As a result of examining the retracting angle of the wind blade edge 23a (see Fig. 4), it was found that the suction performance can be improved by selecting the retracting angle θ2. This will be described in detail later.

Furthermore, in the case of the impeller 20 according to an embodiment of the present disclosure, the protruding end 23d side of the wind blowing edge 23a is higher than the base end 23c side of the wind blowing edge 23a (the suction side of the air passage 50) (50a)) has a blade 23 of a shape. Specifically, as schematically shown in FIG. 3 , the windblown edge 23a of each blade 23 is inclined upward from the base end 23c side leading to the boss portion 21 toward the protruding end 23d side.

By making the windblown edge 23a of each blade 23 this shape, while being able to reduce the wing load of the edge part located on the air inlet side of each blade 23, it is possible to reduce the leakage flow. Then, the present inventors determined the inclination angle θ1 of the wind-blast edge 23a by fluid analysis (the angle at which the wind-blast edge 23a is inclined with respect to the first reference line RL1 orthogonal to the rotation axis A, see FIG. 3) As a result of the study, it was found that the suction performance can be improved by selecting the inclination angle θ1 together with the retreat angle θ2.

5 is a schematic diagram of an example of a model of fluid analysis of an impeller 20 according to an embodiment of the present disclosure. For fluid analysis, a model of the air passage 50 in which the impeller 20 is accommodated, for example, the second diameter reduced portion 12b, is set as shown in FIG. 5, and as indicated by arrows in FIG. , How the suction efficiency (suction force/motor output) changes by changing the size of the inclination angle θ1 of the wind blade edge 23a facing the suction side 50a of the air path 50 was investigated.

6 is a graph showing an example of the relationship between the inclination angle θ1 of the wind blade edge 23a and the suction efficiency according to the result of the fluid analysis. The vertical axis is the suction efficiency, and the horizontal axis is the inclination angle (θ1). As the inclination angle θ1 increases, the suction efficiency gradually increases and then decreases again. It can be seen that the peak of suction efficiency exists near the inclination angle θ1 of about 22°. Specifically, it can be seen that the suction efficiency can be optimized by setting the inclination angle θ1 of the wind blade edge 23a to 18° or more and 26° or less.

Therefore, the inclination angle θ1 of the wind blowing edge 23a of the impeller 20 according to an embodiment of the present disclosure may be set to 18° or more and 26° or less, thereby improving the suction force. Can be optimized. The inclination angle θ1 at which the suction efficiency peaks is most preferable, but if the inclination angle θ1 is selected within the above range according to the specifications of the impeller 20, the effect obtained at the inclination angle θ1 at which the suction efficiency peaks almost equivalent effect can be obtained.

Like the fluid analysis of the inclination angle θ1, how the suction efficiency changes by setting the model as shown in FIG. investigated what to do. 7 is a diagram showing an example of fluid analysis results according to the retreat angle θ2 of the wind blade edge 23a.

Each figure in FIG. 7 shows flow analysis results of air flowing through the second diameter reduction portion 12b (specifically, between the blades 23) at three different retreat angles θ2. The drawing (a) of FIG. 7 shows the case where the retreat angle θ2 is 27°, the drawing (b) of FIG. 7 shows the case where the retreat angle θ2 is 17°, and the drawing (c) of FIG. 7 shows the retreat angle This is the case when (θ2) is 7°. In the drawings (a), (b), and (c) of FIG. 7, the high-concentration portion (R1) represents a portion with a relatively high flow rate of air, and the low-concentration portion (R2) represents a relatively low flow rate of air. represents a part.

In the drawing (a) of FIG. 7 where the retreat angle θ2 is large, the air flowing between the blades 23 tends to flow from the downstream side of the second diameter reduction portion 12b to the base portion 22 side. On the other hand, in the drawing (c) of FIG. 7 where the retreat angle θ2 is small, the air flowing between the blades 23 tends to flow toward the inner wall surface of the second diameter reduction portion 12b. And, in the drawing (b) of FIG. 7 in which the retreat angle θ2 is in the middle, the air flowing between the blades 23 is biased toward the base portion 22 side or the inner wall surface side of the second diameter reducing portion 12b. It tends to flow in the middle part between the blades 23 without hitting.

When the air flows biased toward the base portion 22, the discharge flow becomes non-uniform, flow separation occurs in the vicinity of the base portion 22 on the discharge side 50b, and mixing loss in the impeller 20 increases. Accordingly, a decrease in suction force may be caused. When the air flows biased toward the inner wall surface of the second diameter-reducing part 12b, there is a gap between the blades 23 and the inner wall surface of the second diameter-reducing part 12b, so the air leaks through the gap. This increase may result in a decrease in suction force. On the other hand, if the air flows through the middle part between the blades 23 without being biased towards the base part 22 or the inner wall surface of the second diameter reduction part 12b, the rotational force of the impeller 20 can be effectively applied to the air. and the suction force can be generated efficiently.

8 is a graph showing an example of the relationship between the retraction angle θ2 of the wind blade edge 23a and suction efficiency according to the result of the fluid analysis. As the receding angle θ2 increases, the suction efficiency gradually increases and then gradually decreases again. It can be seen that the suction efficiency peak exists near the retreat angle θ2 at about 17°. Specifically, it can be seen that the suction efficiency can be optimized by setting the retreat angle θ2 of the wind blade edge 23a to 15° or more and 19° or less.

Therefore, the receding angle θ2 of the wind blowing edge 23a of the impeller 20 according to an embodiment of the present disclosure may be set to 15° or more and 19° or less, thereby improving the suction force. Can be optimized. The retreat angle θ2 at which the suction efficiency peaks is most preferable, but if the retreat angle θ2 is selected from the range described above according to the specifications of the impeller 20, it can be obtained at the retreat angle θ2 at which the suction efficiency peaks. You can get almost the same effect as the effect you have.

In the case of the impeller 20 according to an embodiment of the present disclosure, both the inclination angle θ1 and the retreat angle θ2 of the wind-blast edge 23a are optimized. Therefore, the suction power can be further improved by combining these effects. That is, according to the impeller 20 according to an embodiment of the present disclosure, it is possible to better derive the performance of the motor, which tends to increase the rotational speed, and generate high suction force. Therefore, the high-performance vacuum cleaner 1 can be realized by a combination of the fan motor 13 rotating at high speed and the impeller 20 according to an embodiment of the present disclosure.

The impeller 20 of the present disclosure is not limited to the above-described embodiment. For example, in the above embodiment, the impeller 20 having blades 23 of a mixed-flow fan structure was exemplified, but the impeller 20 is centrifugal in which air escapes between the blades 23 in the radial direction during rotation. It may also have blades 23 of a fan structure. That is, the impeller 20 may correspond to a centrifugal fan.

In addition, in the embodiment of the vacuum cleaner 1 described above, the fan motor 13 is arranged upstream with respect to the impeller 20, but as shown in FIG. 9, the fan motor 13 is the impeller 20 It may also be disposed in the exhaust chamber 30 on the downstream side in the direction of air flow.

In the above-described embodiment, the impeller 20 rotating counterclockwise is exemplified, but depending on the specification, the direction of the blades 23 may be reversed so that the impeller 20 rotates clockwise.

A cleaner according to an aspect of the present disclosure includes a main body having a filtration chamber and an exhaust chamber; a dust case connected to the main body; an impeller disposed in the main body and generating a suction force so that air is sucked into the main body from the dust case through an air passage while being rotated; and a fan motor rotating the impeller, wherein the impeller includes: a boss fixed to a shaft of the fan motor; a base portion connected to the boss portion and gradually increasing in diameter from the suction side to the discharge side of the air passage; and a plurality of blades disposed radially in the base portion to generate a suction force on the suction side of the air path, each of the plurality of blades having a wind blowing edge close to the boss portion and a blowing edge far from the boss portion. And, the wind blowing edge has a base end that is an end toward the base portion and a protruding end that is an end opposite to the base end, and the protruding end is located behind the base end based on the rotation direction of the impeller, and the air path Based on , the protruding end of the windblown edge is located on a suction side rather than the base end of the windblown edge. By shaping each blade on the suction side of the impeller in this way, the suction force of the impeller can be improved. That is, by making each blade into a swept wing shape, it is advantageous for high rotation and efficiency can be achieved. In addition, the wing surface load can be reduced by inclining the protruding end of the wind blade edge toward the suction side. By combining these shapes, the suction efficiency can be increased and the suction force can be improved.

As an example, a receding angle of the wind-blast edge with respect to a second reference line passing through the center of rotation of the impeller and the air end of the wind-blast edge may be 15° or more and 19° or less.

As an example, an inclination angle of the windblown edge with respect to a first reference line orthogonal to the rotational axis of the impeller may be 18° or more and 26° or less.

According to the fluid analysis, the suction efficiency can be optimized by setting the angles as described above, and the suction force can be improved compared to the conventional impeller. The impeller of the above-described type may be applied to a vacuum cleaner, for example, a stick type vacuum cleaner. In addition, the above-described impeller can be applied to a vacuum cleaner as an impeller driven by an electric motor capable of being driven by electric energy supply from a battery, for example. According to such an impeller, a high suction force can be obtained with a very small size, so that a high-performance vacuum cleaner that is easy to handle can be realized.

As an example, the blowing edge may be twisted and inclined in a direction opposite to the rotational direction.

As an embodiment, an upper surface of the base portion on which the plurality of blades are disposed may be gently inclined toward the discharge side of the air path as it radially faces an outer circumferential side from the boss portion.

As an example, an inclination angle of the upper surface of the base part may be 20° to 40°.

As an example, the plurality of blades may have a structure of any one of a mixed-flow fan structure and a centrifugal fan structure.

The vacuum cleaner according to an embodiment of the present disclosure includes a first large-diameter portion connected to the dust case and a first diameter-reduced portion extending from the first large-diameter portion in an air flow direction so that the diameter gradually decreases. shroud; A downstream shroud having a second large-diameter portion connected to the exhaust chamber and a second diameter-reduced portion extending from the second large-diameter portion to a direction opposite to the air flow direction and connected to the first diameter-reduced portion. may be provided, and the impeller may be disposed in the second diameter reduction unit.

A cleaner according to an embodiment of the present disclosure may include a diffuser accommodated in the second large-diameter portion.

An impeller according to one aspect of the present disclosure is disposed in an air passage and rotates to suck in and discharge air, and includes a boss fixed to a shaft of a fan motor; a base portion connected to the boss portion and gradually increasing in diameter from the suction side to the discharge side of the air passage; and a plurality of blades disposed radially in the base portion to generate a suction force on the suction side of the air path, each of the plurality of blades having a wind blowing edge close to the boss portion and a blowing edge far from the boss portion. And, the wind blowing edge has a base end that is an end toward the base portion and a protruding end that is an end opposite to the base end, and the protruding end is located behind the base end based on the rotation direction of the impeller, and the air path Based on , the protruding end of the windblown edge is located on a suction side rather than the base end of the windblown edge.

As described above, although the embodiments have been described with limited examples and drawings, those skilled in the art can make various modifications and variations from the above description. In addition, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims also fall within the scope of the present invention.

Claims

a body portion 3 having a filtration chamber 31 and an exhaust chamber 30;

a dust case (4) connected to the main body;

an impeller 20 disposed in the main body and generating a suction force so that air is sucked into the main body from the dust case through the air path 500 while being rotated;

A fan motor 13 rotating the impeller;

The impeller,

a boss part 21 fixed to the shaft 13a of the fan motor;

a base portion 22 connected to the boss portion and gradually increasing in diameter from the suction side 50a to the discharge side 50b of the air passage; and

A plurality of blades 23 radially disposed on the base portion to generate a suction force on the suction side of the air passage;

Each of the plurality of blades has a wind blowing edge 23a close to the boss and a blowing edge 23b far from the boss,

The windblown edge has a base end 23c, which is an end of the base portion, and a protruding end 23d, which is an end opposite to the base end,

Based on the rotation direction of the impeller, the protruding end is located behind the base end,

Based on the air path, the protruding end of the wind blowing edge is located on a suction side of the base end of the wind blowing edge.
According to claim 1,

A receding angle of the windblown edge with respect to a second reference line RL2 passing through the center of rotation of the impeller and the air end of the windblown edge is 15° or more and 19° or less.
According to claim 1 or 2,

An inclination angle of the wind-blown edge with respect to the first reference line RL1 orthogonal to the rotational axis of the impeller is 18° or more and 26° or less.
According to any one of claims 1 to 3,

The blowing edge is twisted in a direction opposite to the rotational direction (Yr) and inclined.
According to any one of claims 1 to 4,

The cleaner of claim 1 , wherein an upper surface of the base portion on which the plurality of blades are disposed is gently inclined toward the discharge side of the air passage as it radially faces an outer circumferential side from the boss portion.
According to claim 5,

The inclination angle of the upper surface of the base part is 20 ° to 40 ° cleaner.
According to any one of claims 1 to 6,

The plurality of blades have a structure of any one of a mixed flow fan structure and a centrifugal fan structure.
According to any one of claims 1 to 7,

An upstream shroud (11) having a first large-diameter portion (11a) connected to the dust case and a first diameter-reduced portion (11b) whose diameter gradually decreases from the first large-diameter portion toward the air flow direction. ;

A second large-diameter portion 12a connected to the exhaust chamber and a second diameter-reduced portion 12b extending from the second large-diameter portion to a gradually smaller diameter in the opposite direction to the air flow direction and connected to the first diameter-reduced portion ) and a downstream shroud 12 having a

The impeller is disposed in the second diameter reduction part.
According to claim 8,

A cleaner having a diffuser (15) accommodated in the second large-diameter part.
As the impeller 20 disposed in the air passage 50 and sucking in and discharging air while being rotated,

a boss portion 21 fixed to the shaft 13a of the fan motor 13;

a base portion connected to the boss portion and gradually increasing in diameter from the suction side (50a) to the discharge side (50b) of the air passage; and

A plurality of blades 23 radially disposed on the base portion to generate a suction force on the suction side of the air passage;

Each of the plurality of blades has a wind blowing edge 23a close to the boss and a blowing edge 23b far from the boss,

The windblown edge has a base end 23c, which is an end of the base portion, and a protruding end 23d, which is an end opposite to the base end,

Based on the rotation direction of the impeller, the protruding end is located behind the base end,

The impeller wherein the protruding end of the wind blowing edge is located on a suction side of the base end of the wind blowing edge based on the air passage.
According to claim 10,

The impeller having a receding angle of the wind-blast edge with respect to the second reference line RL2 passing through the center of rotation of the impeller and the air end of the wind-blast edge is 15° or more and 19° or less.
According to claim 10 or 11,

An impeller having an inclination angle of the wind-blast edge with respect to the first reference line RL1 orthogonal to the rotational axis of the impeller is 18 ° or more and 26 ° or less.
According to any one of claims 10 to 12,

An upper surface of the base portion on which the plurality of blades are disposed is gently inclined toward the discharge side of the air passage as it radially faces an outer circumferential side from the boss portion.
According to claim 13,

The inclination angle of the upper surface of the base portion is 20 ° ~ 40 ° impeller.
According to any one of claims 10 to 14,

The plurality of blades impeller having any one of a mixed-flow fan structure and a centrifugal fan structure.