WO2024135951A1

WO2024135951A1 - Vacuum cleaner

Info

Publication number: WO2024135951A1
Application number: PCT/KR2023/005467
Authority: WO
Inventors: 임진섭; 김민규; 강준혁
Original assignee: 엘지전자 주식회사
Priority date: 2022-12-21
Filing date: 2023-04-21
Publication date: 2024-06-27
Also published as: KR20240098830A

Abstract

A vacuum cleaner according to one aspect of the present specification may comprise: an impeller having a hub and twist-type rotary blades disposed on the hub; and a diffuser disposed to guide the air discharged from the impeller. The rotary blade can have an airfoil shape having a thickness that nonlinearly changes from the leading edge of the rotary blade to the trailing edge of the rotary blade. In addition, at positions spaced the same distance from the trailing edges of the rotary blades to the leading edges of the rotary blades, the thicknesses of the hub-side end portions of the rotary blades can be thicker than the thicknesses of the shroud-side end portions of the rotary blades. Therefore, the degree of vacuum and suction efficiency of the vacuum cleaner can be improved, and manufacturing costs can be reduced.

Description

Vacuum cleaner

This specification relates to a vacuum cleaner, and more specifically, to a vacuum cleaner equipped with a suction unit that improves the vacuum degree and suction efficiency by improving the inflow speed and flow of air.

A vacuum cleaner is a home appliance that uses electricity to suck in air, sucking in small trash or dust, and filling it into a dust bin.

These vacuum cleaners can be divided into manual vacuum cleaners, in which the user moves the vacuum cleaner while performing cleaning, and automatic vacuum cleaners, in which the vacuum cleaner performs cleaning while traveling on its own.

Vacuum cleaners can be divided into wired vacuum cleaners that are powered through a power cable and cordless vacuum cleaners that are powered by batteries.

However, cordless vacuum cleaners have a limited usage time due to the use of batteries.

Therefore, in the case of a high-output cordless vacuum cleaner that requires high suction power, the fan motor that makes up the suction unit drives at high speed, which increases the axial power of the impeller, increasing power consumption, which reduces battery usage time. There are problems.

Here, the fan motor is a component including a fan that generates an air flow to suck in dust and a motor for driving the fan, and is one of the components of the suction unit.

Accordingly, in order to secure battery usage time by lowering the power consumption of the fan motor, and to improve suction power, the efficiency of the fan motor must be improved. In order to improve the efficiency of the fan motor, the efficiency of the fan flow path including the impeller and diffuser must be improved. needs to be improved, and research on this is actively being conducted.

As an example, Republic of Korea Patent Publication No. 10-2061517B1 (hereinafter referred to as “Prior Document 1”) states that the leading edge of the blade provided on the impeller of the suction unit is 60 degrees or more and 80 degrees or less with respect to the axial direction. A vacuum cleaner formed with an inclination angle of .

As another example, Chinese Patent Publication No. 113074138B (hereinafter referred to as “Prior Document 2”) states that the blade rows formed in the diffuser of the suction unit are arranged in multiple rows along the axial direction, the number of blades in each blade row is plural, and the number of blades is A plurality of blades in each row are arranged along the perimeter of the base, the short side of the base is circular, and the blades in the second row are set irregularly from head to tail.

However, in the prior art document 1, the thickness of the blade is formed to be constant from the hub side end to the shroud side end.

Here, the hub side end refers to the inner end of the blade, and the shroud side end refers to the outer end of the blade.

Therefore, there is a problem in that the air flow in the entire area of the blade from the hub side end to the shroud side end cannot be efficiently improved, which causes flow resistance, increases pressure loss, and reduces the efficiency of the fan flow path. There is.

And in the prior art document 2, the thickness from the hub side end of the blade located in the upper row of the diffuser to the shroud side end is formed to be constant.

In addition, in the case of prior patent 2, the length of the blades is long, so overlap between blades occurs.

That is, in neighboring blades, the leading edge of one blade overlaps the trailing edge of the other blade in the axial direction.

Therefore, there is a problem in that the diffuser is not easy to manufacture because the diffuser is not easy to take out after injection.

The problem to be solved by this specification is to provide a vacuum cleaner equipped with a suction unit that can solve the above-mentioned problems.

In addition, the problem that the present specification aims to solve is to provide a vacuum cleaner in which the rotating blade of the impeller is formed in an airfoil shape to reduce flow separation.

In addition, the problem that the present specification aims to solve is to provide a vacuum cleaner in which the fixed blade of the diffuser is formed in an airfoil shape to reduce flow separation.

In addition, the problem to be solved by this specification is to provide a vacuum cleaner with a suction unit with reduced weight.

Additionally, the problem to be solved by this specification is to provide a vacuum cleaner equipped with a suction unit with improved vacuum degree and suction efficiency.

The problems to be solved in this specification are not limited to the problems mentioned above, and other problems not mentioned can be clearly understood by those skilled in the art from the description below. will be.

A vacuum cleaner according to one aspect of the present specification for achieving the above problem includes an impeller having a hub and a twist-type rotating blade disposed on the hub, It may include a diffuser disposed to guide the air discharged from the impeller.

The rotating blade may have an airfoil shape in which the thickness from the leading edge of the rotating blade to the trailing edge of the rotating blade changes non-linearly.

Here, the leading edge refers to an edge located upstream in the direction in which the air flowing into the suction unit of the vacuum cleaner, for example, the fan motor, moves, and the trailing edge refers to the edge where the air flowing into the suction unit moves. It refers to an edge located downstream in the direction of movement.

According to this configuration, pressure loss due to flow separation can be reduced due to the geometric characteristics of the airfoil shape.

The first length of the hub-side end from the leading edge of the rotary blade to the trailing edge of the rotary blade is the second length of the shroud-side end from the leading edge of the rotary blade to the trailing edge of the rotary blade. It may be formed to be longer than 2 lengths, and at a position spaced by the same distance from the trailing edge of the rotary blade toward the leading edge of the rotary blade, the thickness of the hub side end of the rotary blade is equal to that of the rotary blade. It may be formed thicker than the thickness of the shroud side end.

Here, the hub-side end refers to the inner end of the rotating blade, and the shroud-side end refers to the outer end of the rotating blade, which is located on the opposite side of the hub-side end.

According to this configuration, since the thickness of the hub-side end of the rotating blade is thicker than the thickness of the shroud-side end of the rotating blade, the flow of air with centrifugal force is concentrated on the shroud-side end of the rotating blade.

Therefore, it is possible to secure the flow path area by reducing the thickness, and the flow of air passing between the rotating blades can be improved, thereby improving the suction power and suction efficiency of the vacuum cleaner.

Additionally, since the thickness of the shroud-side end of the rotary blade is thinner than the thickness of the hub-side end of the rotary blade, the task of removing the impeller from the mold after injecting the impeller can be easily performed. Therefore, the manufacturability of the impeller can be improved.

Additionally, since the thickness of the hub-side end of the rotary blade is thicker than the thickness of the shroud-side end of the rotary blade, the strength of the rotary blade can be improved.

In the leading edge of the rotary blade, a first entrance angle of the hub-side end of the rotary blade may be 42 degrees to 52 degrees, and a second entrance angle of the shroud-side end of the rotary blade may be 50 degrees to 52 degrees. It could be 60 degrees.

And in the trailing edge of the rotary blade, a first exit angle of the hub-side end of the rotary blade may be 33 degrees to 43 degrees, and a second exit angle of the shroud-side end of the rotary blade may be 36 degrees. It may be between degrees and 46 degrees.

The first inlet angle may be smaller than the second inlet angle, and the first outlet angle may be smaller than the second outlet angle.

As an example, the first inlet angle may be 48 degrees, the second inlet angle may be 55 degrees, the first outlet angle may be 38 degrees, and the second outlet angle may be 42 degrees.

The portion having the maximum thickness of the hub-side end of the rotary blade and the portion having the maximum thickness of the shroud-side end of the rotary blade may be located at different positions in the longitudinal direction of the rotary blade.

As an example, the distance between the portion having the maximum thickness of the hub-side end of the rotating blade and the leading edge of the rotating blade is equal to the portion having the maximum thickness of the hub-side end of the rotating blade and the trailing edge of the rotating blade. It may be formed to be larger than the distance between edges, and the distance between the portion having the maximum thickness of the shroud-side end of the rotating blade and the leading edge of the rotating blade is the maximum thickness of the shroud-side end of the rotating blade. It may be formed to be smaller than the distance between the portion having and the trailing edge of the rotating blade.

When the first length is L1 and the second length is L2, the portion having the maximum thickness of the hub side end of the rotary blade is located between 0.5L1 and 0.7L1 from the leading edge of the rotary blade. The portion having the maximum thickness of the shroud-side end of the rotating blade may be located between 0.2L2 and 0.4L2 from the leading edge of the rotating blade.

The diffuser may include a first diffuser located below the hub and having a plurality of first fixed blades, and a second diffuser located below the first diffuser and having a plurality of second fixed blades. there is.

If the diffuser consists of a first diffuser and a second diffuser, the diffuser can be easily manufactured using an injection method.

The first fixed blade may have an airfoil shape in which the thickness from the leading edge of the first fixed blade to the trailing edge of the first fixed blade changes non-linearly.

Here, the leading edge of the first fixed blade refers to an edge located upstream in the direction in which the air flowing into the first diffuser moves, and the trailing edge of the first fixed blade refers to the edge located on the upstream side in the direction in which the air flowing into the first diffuser moves. It refers to an edge located downstream in the direction in which the incoming air moves.

The third length of the hub side end from the leading edge of the first fixed blade to the trailing edge of the first fixed blade is from the leading edge of the first fixed blade to the trailing edge of the first fixed blade. It may be formed to be equal to the fourth length of the shroud side end, and at a position spaced apart by the same distance from the trailing edge of the first fixed blade toward the leading edge of the first fixed blade, the second 1 The thickness of the hub-side end of the fixed blade may be thicker than the thickness of the shroud-side end of the first fixed blade.

Here, the hub-side end of the first fixed blade refers to the inner end of the first fixed blade, and the shroud-side end of the first fixed blade is a portion located on the opposite side of the hub-side end and is the outside of the first fixed blade. It refers to the end of the side.

According to this configuration, since the thickness of the hub-side end of the first fixed blade is thicker than the thickness of the shroud-side end of the first fixed blade, the flow of air with centrifugal force is concentrated on the shroud-side end of the first fixed blade. .

Therefore, it is possible to secure the flow path area by reducing the thickness, and the flow of air passing between the first fixed blades can be improved, thereby improving the suction power and suction efficiency of the vacuum cleaner.

In addition, since the thickness of the shroud-side end of the first fixed blade is thinner than the thickness of the hub-side end of the first fixed blade, the operation of removing the first diffuser from the mold after injecting the first diffuser can be easily performed. there is. Accordingly, manufacturability of the first diffuser can be improved.

Additionally, since the thickness of the hub-side end of the first fixed blade is thicker than the thickness of the shroud-side end of the first fixed blade, the strength of the first fixed blade can be improved.

The distance between the portion having the maximum thickness of the hub-side end of the first fixed blade and the leading edge of the first fixed blade is equal to the portion having the maximum thickness of the hub-side end of the first fixed blade and the first fixed blade. It may be formed to be smaller than the distance between the trailing edges of the blades, and the distance between the portion having the maximum thickness of the shroud side end of the first fixed blade and the leading edge of the first fixed blade is the first fixed blade. It may be formed to be smaller than the distance between the portion having the maximum thickness of the end of the shroud side of the blade and the trailing edge of the first fixed blade.

When the third length and the fourth length are L3, the portion having the maximum thickness of the hub side end of the first fixed blade is located between 0.3L3 and 0.45L3 from the leading edge of the first fixed blade. The portion having the maximum thickness of the shroud-side end of the first fixed blade may be located between 0.3L3 and 0.4L3 from the leading edge of the first fixed blade.

In adjacent first fixed blades, the leading edge of one fixed blade and the trailing edge of the other fixed blade may not overlap each other in the axial direction.

According to this configuration, since overlap between the first fixed blades is suppressed, the operation of taking out the first diffuser from the mold after injecting the first diffuser can be easily performed. Accordingly, manufacturability of the first diffuser can be improved.

The thickness of the hub-side end of the second fixed blade may be the same as the thickness of the shroud-side end of the second fixed blade.

Here, the hub-side end of the second fixed blade refers to the inner end of the second fixed blade, and the shroud-side end of the second fixed blade refers to the outer end of the second fixed blade.

When a first diffuser with a first fixed blade and a second diffuser with a second fixed blade are used together, pressure loss during air intake can be minimized.

The number of second fixed blades may be greater than the number of first fixed blades.

The third entrance angle of the leading edge of the first fixed blade may be formed to be larger than the third exit angle of the trailing edge of the first fixed blade, and the fourth entrance angle of the leading edge of the second fixed blade may be formed to be larger than the fourth exit angle of the trailing edge of the second fixed blade.

And the fourth inlet angle may be formed to be 25 to 35 degrees larger than the third outlet angle.

According to this configuration, the suction power and suction efficiency of the vacuum cleaner can be improved.

Here, the hub-side end of the first fixed blade refers to the inner end of the first fixed blade, and the shroud-side end of the first fixed blade is a portion located on the opposite side of the hub-side end and is the outside of the first fixed blade. Refers to the end of the side.

1 is an external perspective view of a vacuum cleaner according to an embodiment of the present specification.

Figure 2 is an exploded perspective view of a suction unit provided in a vacuum cleaner according to an embodiment of the present specification.

Figure 3 is a cross-sectional view showing the assembled state of the suction unit shown in Figure 2.

Figure 4 is a perspective view of the impeller shown in Figure 2.

FIG. 5 is a table showing the efficiency of a vacuum cleaner according to the inlet angle and outlet angle of the rotating blade provided in the impeller shown in FIG. 4.

FIG. 6 is a plan view showing the thickness profile of the hub side end of the rotary blade shown in FIG. 4.

FIG. 7 is a graph showing the thickness profile of the hub side end of the rotary blade shown in FIG. 4.

FIG. 8 is a graph showing the angle profile of the hub side end of the rotating blade shown in FIG. 4.

FIG. 9 is a table showing the thickness profile and angle profile of the hub side end of the rotary blade shown in FIG. 4.

FIG. 10 is a plan view showing the thickness profile of the shroud side end of the rotating blade shown in FIG. 4.

FIG. 11 is a graph showing the thickness profile of the shroud side end of the rotating blade shown in FIG. 4.

FIG. 12 is a graph showing the angle profile of the shroud side end of the rotating blade shown in FIG. 4.

FIG. 13 is a table showing the thickness profile and angle profile of the shroud side end of the rotary blade shown in FIG. 4.

FIG. 14 is a table showing the efficiency of the vacuum cleaner according to the thickness of the rotating blade shown in FIG. 4.

Figure 15 is a perspective view showing the assembled state of the diffuser shown in Figure 2.

Figure 16 is a plan view of the first diffuser shown in Figure 15.

Figure 17 is a plan view of the second diffuser shown in Figure 15.

FIG. 18 is a plan view showing the thickness profile of the hub side end portion of the first fixed blade shown in FIG. 15.

FIG. 19 is a graph showing the thickness profile of the hub side end portion of the first fixed blade shown in FIG. 15.

FIG. 20 is a plan view showing the thickness profile of the shroud side end of the first fixed blade shown in FIG. 15.

FIG. 21 is a graph showing the thickness profile of the shroud side end of the first fixed blade shown in FIG. 15.

FIG. 22 is a table showing the efficiency of the vacuum cleaner according to the thickness of the first fixed blade shown in FIG. 15.

Figure 23 is a conceptual diagram showing the exit angle of the first fixed blade and the entrance angle of the second fixed blade.

Figure 24 is a graph showing the efficiency of a vacuum cleaner according to the size of the difference between the entrance angle of the second fixed blade and the exit angle of the first fixed blade.

Hereinafter, embodiments disclosed in the present specification (discloser) will be described in detail with reference to the attached drawings. However, identical or similar components will be assigned the same reference numbers regardless of reference numerals, and duplicate descriptions thereof will be omitted.

However, the technical idea of the present specification is not limited to some of the described embodiments, but may be implemented in various different forms, and within the scope of the technical idea of the present specification, one or more of the components may be optionally used between the embodiments. It can be used by combining or replacing.

In addition, terms (including technical and scientific terms) used in the embodiments of the present specification, unless specifically defined and described, are generally understood by those skilled in the art to which the present specification pertains. It can be interpreted as meaning, and the meaning of commonly used terms, such as terms defined in a dictionary, can be interpreted by considering the contextual meaning of the related technology.

Additionally, the terms used in the embodiments of this specification are for describing the embodiments and are not intended to limit the present specification.

In this specification, the singular may also include the plural unless specifically stated in the phrase, and when described as "at least one (or more than one) of A and B and C", it is combined with A, B, and C. It can contain one or more of all possible combinations.

Additionally, in describing the components of the embodiments of the present specification, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and are not limited to the essence, order, or order of the component.

And, when a component is described as being 'connected', 'coupled', or 'connected' to another component, that component is directly 'connected', 'coupled', or 'connected' to that other component. In addition to cases, it may also include cases where the component is 'connected', 'coupled', or 'connected' by another component between that component and that other component.

Additionally, when described as being formed or disposed “on top” or “bottom” of each component, “top” or “bottom” means that the two components are directly adjacent to each other. This includes not only the case of contact, but also the case where one or more other components are formed or disposed between the two components. In addition, when expressed as “top” or “bottom,” the meaning of not only the upward direction but also the downward direction can be included based on one component.

Meanwhile, the term ‘discloser’ can be replaced with terms such as document, specification, description, etc.

Hereinafter, the vacuum cleaner of this specification will be described with reference to the accompanying drawings.

A vacuum cleaner according to an embodiment of the present specification may include a dust bin 100. The dust bin 100 may include an intake port 110 through which air containing dust is sucked. The intake port 110 may guide air containing dust into the dust bin 100.

The vacuum cleaner may further include a motor housing 200 on which the dust bin 100 is coupled to the lower side, and a handle portion 300 coupled to the motor housing 200.

The handle unit 300 may be located on the opposite side of the motor housing 200 from the suction port 110. However, the positions of the intake port 110 and the handle unit 300 are not limited to this.

The dust bin 100 can separate dust sucked into the interior through the suction port 110 and store the separated dust.

A dust separator may be located inside the dust bin 100. The dust separation unit may include a cyclone unit capable of separating dust by cyclonic flow. The cyclone unit may be in communication with the suction port 110.

The dust bin 100 and the motor housing 200 to which the dust bin 100 is coupled at the bottom may each be formed in a cylindrical shape, for example.

The lower side of the dust bin 100 can be opened and closed by a body cover that rotates with a hinge. However, the lower side of the dust bin 100 may be formed as one body with the dust bin main body.

Inside the dust bin 100, a filter part arranged to surround the cyclone part may be located.

The filter unit, for example, may be formed in a cylindrical shape and filters dust as air passes through it.

To this end, the filter unit may include a mesh portion having a plurality of holes. The mesh part is not limited, but may be formed of a metal material.

Since the mesh unit filters air, dust may accumulate in the mesh unit, requiring cleaning of the mesh unit.

Therefore, in this specification, the vacuum cleaner may further include a dust compression unit for cleaning the filter unit, for example, a simple cleaning system.

The dust compression unit includes a movable part disposed in the motor housing 200 so as to be movable in the up and down direction inside the dust bin 100, an operation part 153 that the user operates to move the movable part in the up and down direction, and the manipulation part ( 153) may include a transmission unit for transmitting the operating force to the movable unit.

The manipulation unit 153 may be disposed outside the motor housing 200. For example, the manipulation unit 153 may be positioned higher than the motor disposed inside the motor housing 200.

The transmission unit 155 may be formed to be long in the vertical direction inside the motor housing 200, and the manipulation unit 153 may be coupled to the upper end, and the movable unit may be coupled to the lower end.

Accordingly, when the manipulation unit 153 is operated, the movable unit can move downward along the outer peripheral surface of the filter unit.

The handle unit 300 may include a handle body 310 for the user to hold, and a battery housing 320 disposed below the handle body 310 and capable of accommodating a battery 330. .

A slot 210 may be formed in the motor housing 200 to move the manipulation unit 153. However, it is also possible to form the slot 210 in the handle body 310.

A suction unit, for example, a fan motor 400, may be disposed inside the motor housing 200 to generate suction force. Suction force generated by the fan motor 400 may act on the suction port 110.

The fan motor 400 may be located above the dust bin 100 and the battery 330 based on the extending direction of the axis of the cyclone flow of the cyclone unit.

A schematic configuration of the suction unit of the vacuum cleaner according to the present specification will be described.

The suction unit may include a fan motor 400, where the fan motor 400 is a component including a fan (or impeller) that generates an air flow for sucking dust and a motor for driving the fan, It corresponds to one of the components of the suction unit.

The suction unit, specifically the fan motor 400, includes an inverter 410, a motor 420 including a stator 421 and a rotor 423, an impeller 430, a diffuser 450, and an impeller cover 470. may include.

The inverter 410 is composed of software and hardware for the rotational operation of the motor 420, and controls the motor 420 so that an appropriate current is applied.

The impeller 430 is coupled to the top of the rotating shaft 425 coupled to the rotor 423 of the motor 420, and when the rotating shaft 425 rotates by the electromagnetic force of the stator 421 and the rotor 423 Air is sucked in while rotating with the rotating shaft 425.

The impeller cover 470 is a structure that covers the impeller 430 and forms an appropriate air gap between the impeller 430 and the impeller 430 to generate suction force.

The diffuser 450 is coupled to the rotation shaft 425 with a bearing 451 in between, and serves to fix the stator 421 of the motor 420 in place. Additionally, it serves to guide the air generated by the rotation of the impeller 430 to pass through the motor 420.

The impeller 430 includes a hub 431 (hub) formed in a substantially funnel shape.

On one side of the hub 431, for example, on the outer surface, a plurality of rotating blades 433 are located at regular intervals, and each rotating blade 433 is formed in a twist shape.

In this specification, the hub 431 and the plurality of rotating blades 433 constitute the impeller 430.

Hereinafter, the fan motor provided in the vacuum cleaner of this specification will be described in detail with reference to FIGS. 4 to 24.

Figure 4 is a perspective view of the impeller shown in Figure 2.

Figure 16 is a plan view of the first diffuser shown in Figure 15.

Figure 17 is a plan view of the second diffuser shown in Figure 15.

The rotating blade 433 disposed on the hub 431 of the impeller 430 has a nonlinear thickness from the leading edge LE1 to the trailing edge TE1. It can have an airfoil shape that changes dramatically.

Here, the leading edge (LE1) refers to an edge located upstream in the direction in which air flowing into the suction unit of the vacuum cleaner, for example, the fan motor 400, moves, and the trailing edge (TE1) refers to an edge located downstream in the direction in which the air flowing into the fan motor 400 moves.

If the rotating blade 433 has an airfoil shape, pressure loss due to flow separation can be reduced due to the geometric characteristics of the airfoil shape.

The first length L1 of the hub side end 433a from the leading edge LE1 of the rotary blade 433 to the trailing edge TE1 is lengthened from the leading edge LE1 of the rotary blade 433 to the trailing edge TE1. It may be formed to be longer than the second length L2 of the shroud side end 433b up to TE1).

7 and 11, as an example, the first length L1 of the hub side end 433a of the rotary blade 433 may be formed to be approximately 20.22M, and the shroud side of the rotary blade 433 may be approximately 20.22M. The second length L2 of the end portion 433b may be 14.06M.

Here, “M” is a value obtained by integrating the ratio of the meridian length and radius of the rotating blade 433 into the length, and is a value converted into a ratio of the meridional length.

The trailing edge TE1 of the rotating blade 433 may be parallel to the axial direction of the rotating shaft 425.

The rotating blade 433 has a shroud-side end portion 433b whose thickness is thinner than the hub-side end portion 433a. In other words, the hub-side end 433a of the rotating blade 433 is formed to be thicker than the thickness of the shroud-side end 433b.

That is, at a position spaced apart by the same distance from the trailing edge (TE1) of the rotary blade 433 toward the leading edge (LE1), the thickness of the hub side end 433a of the rotary blade 433 is It may be formed thicker than the thickness of the shroud side end (433b).

Here, the hub side end 433a refers to the inner end of the rotating blade 433, and the shroud side end 433b is a portion located on the opposite side of the hub side end 433a and refers to the outer side of the rotating blade 433. It says the end.

Referring to FIGS. 7 and 11 , as an example, at a position spaced apart by 2M from the trailing edge (TE1) of the rotary blade 433 toward the leading edge (LE1), the hub side end (433a) is approximately 1.5 mm. It has a thickness, and the shroud side end 433b has a thickness of approximately 0.63 mm.

According to this configuration, the thickness of the hub side end 433a of the rotating blade 433 is thicker than the thickness of the shroud side end 433b of the rotating blade 433, so the flow of air with centrifugal force flows through the rotating blade 433. ) is concentrated on the shroud side end (433b).

Therefore, it is possible to secure the flow path area by reducing the thickness of the shroud-side end 433b, and the flow of air passing between the rotating blades 433 can be improved, thereby improving the suction power and suction efficiency of the vacuum cleaner. can be improved.

In addition, since the thickness of the shroud-side end 433b of the rotary blade 433 is thinner than the thickness of the hub-side end 433a of the rotary blade 433, after injection-molding the impeller 430, the impeller 430 must be molded. The extraction operation can be easily performed. Therefore, the manufacturability of the impeller 430 can be improved.

Additionally, since the thickness of the hub-side end 433a of the rotary blade 433 is thicker than the thickness of the shroud-side end 433b of the rotary blade 433, the strength of the rotary blade 433 can be improved.

4 and 5, at the leading edge LE1 of the rotary blade 433, the first entrance angle θ1 of the hub side end 433a of the rotary blade 433 may be 42 degrees to 52 degrees. and the second entrance angle θ2 of the shroud-side end 433b of the rotating blade 433 may be 50 degrees to 60 degrees.

And at the trailing edge TE1 of the rotary blade 433, the first exit angle θ3 of the hub side end 433a of the rotary blade 433 may be 33 degrees to 43 degrees, and the rotary blade 433 The second outlet angle θ4 of the shroud side end 433b may be 36 degrees to 46 degrees.

The angles (θ1 to θ4) are set based on the experiments of Examples 1 to 3 of FIG. 5. Referring to FIG. 5, the first entrance angle of the rotating blade 433 ( It can be seen that the efficiency of the vacuum cleaner is excellent when the θ1), the two inlet angles θ2, the first outlet angle θ3, and the second outlet angle θ4 satisfy the above range.

The first inlet angle θ1 may be smaller than the second inlet angle θ2, and the first outlet angle θ3 may be smaller than the second outlet angle θ4.

Referring to Figure 5, the first inlet angle (θ1) is 48 degrees, the second inlet angle (θ2) is 55 degrees, the first outlet angle (θ3) is 38 degrees, and the second outlet angle (θ4) is In Example 1, which is 42 degrees, it can be seen that the efficiency of the vacuum cleaner is better than Examples 2 and 3.

The portion A1 having the maximum thickness of the hub side end 433a of the rotary blade 433 and the portion A2 having the maximum thickness of the shroud side end 433b of the rotary blade 433 are the rotary blade 433. Can be located at different positions in the longitudinal direction.

As an example, the distance D1 between the portion A1 having the maximum thickness of the hub side end 433a of the rotary blade 433 and the leading edge LE1 of the rotary blade 433 is the hub of the rotary blade 433. It may be formed to be larger than the distance D2 between the portion A1 having the maximum thickness of the side end 433a and the trailing edge TE1 of the rotary blade 433, and the shroud side end of the rotary blade 433. The distance D3 between the portion A2 having the maximum thickness of (433b) and the leading edge LE1 of the rotating blade 433 is the portion having the maximum thickness of the shroud side end 433b of the rotating blade 433. It may be formed to be smaller than the distance D4 between (A2) and the trailing edge (TE1) of the rotating blade 433.

Here, the distance D1 between the portion A1 having the maximum thickness of the hub side end 433a of the rotary blade 433 and the leading edge LE1 of the rotary blade 433 is the hub of the rotary blade 433. It refers to the distance from the longitudinal center position of the portion (A1) having the maximum thickness of the side end (433a) to the leading edge (LE1) of the rotating blade (433).

And, the distance D2 between the portion A1 having the maximum thickness of the hub side end 433a of the rotary blade 433 and the trailing edge TE1 of the rotary blade 433 is the hub of the rotary blade 433. It refers to the distance from the longitudinal center position of the portion (A1) having the maximum thickness of the side end (433a) to the trailing edge (TE1) of the rotating blade (433).

And the distance D3 between the portion A2 having the maximum thickness of the shroud side end 433b of the rotary blade 433 and the leading edge LE1 of the rotary blade 433 is the shroud of the rotary blade 433. It refers to the distance from the longitudinal center position of the portion (A2) having the maximum thickness of the side end (433b) to the leading edge (LE1) of the rotating blade.

And the distance D4 between the portion A2 having the maximum thickness of the shroud side end 433b of the rotary blade 433 and the trailing edge TE1 of the rotary blade 433 is the shroud of the rotary blade 433. It refers to the distance from the longitudinal center position of the portion (A2) having the maximum thickness of the wood side end (433b) to the trailing edge (TE1) of the rotating blade.

Referring to Figures 6 and 7, the portion having the maximum thickness of the hub side end of the rotating blade 433 may be located between 0.5L1 and 0.7L1 from the leading edge of the rotating blade.

And, the thickness of the hub side end 433a of the rotating blade 433 is 4th position (P4-1 and P4-2) > 3rd position (P3) > 5th position (P5) > 6th position (P6). It can be changed in the order of >2nd position (P2)>7th position (P7)>1st position (P1).

Here, the first position (P1) is the same position as the leading edge (LE1) of the hub side end (433a), and the seventh position (P7) is the same position as the trailing edge (TE1) of the hub side end (433a). am.

And, referring to FIGS. 10 and 11, the portion A2 having the maximum thickness of the shroud side end 433b of the rotary blade 433 is 0.2L2 to 0.4L from the leading edge LE1 of the rotary blade 433. It can be located between L2.

And the thickness of the shroud side end 433b of the rotating blade 433 is 11th position (P11-1 and P11-2) > 10th position (P10) > 12th position (P12) > 13th position (P13). It can be changed in the order of >9th position (P9)>8th position (P8).

Here, the 8th position (P8) is the same as the leading edge (LE1) of the shroud-side end (433b), and the 13th position (P13) is the same as the trailing edge (TE1) of the shroud-side end (433b). It's the same location.

Referring to FIG. 14, the thickness of the hub side end 433a of the rotating blade 433 is 0.2 mm (thickness at the first position P1 in Examples 4 and 5) to 2.9 mm (thickness at the fourth position in Example 6). (thickness at P4-1 and P4-2)), and the thickness of the shroud side end 433b is 0.1 mm (at the 8th position (P8) in Examples 4 and 5). The thickness may vary non-linearly within the range of 1.38 mm (thickness at the 11th position (P11-1 and P11-2) of Example 6).

The thickness was set based on the experiments in Examples 4 to 6 of FIG. 14. Referring to FIG. 14, the thickness of the hub side end 433a of the rotary blade 433 is When the thickness of the wood side end portion 433b satisfies the above range, it can be seen that the efficiency of the vacuum cleaner is close to or exceeds 63%.

In particular, referring to FIG. 14, as in Example 4, the thickness of the hub side end 433a of the rotating blade 433 changes non-linearly within the range of 0.2 mm to 2.4 mm, and the shroud side end 433b When the thickness changes non-linearly within the range of 0.1 mm to 0.88 mm, it can be seen that the efficiency of the vacuum cleaner is better than Examples 5 and 6.

The rotating blade 433 may be formed in a twisted shape.

FIG. 8 shows the angle profile of the hub-side end 433a of the rotary blade 433, and FIG. 12 shows the angle profile of the shroud-side end 433b of the rotary blade 433.

In FIGS. 8 and 12, “M-Prime” is a value obtained by integrating the ratio of the meridional length and radius of the rotating blade 433 into the length, and is a value converted into a ratio of the meridional length.

The fan motor 400 may further include a diffuser 450 disposed to guide the air discharged from the impeller 430.

According to the present specification, the diffuser 450 includes a first diffuser 453 located below the hub 431 and having a plurality of first fixed blades 454, and located below the first diffuser 453. And may include a second diffuser 455 having a plurality of second fixed blades 456.

If the diffuser 450 is composed of a first diffuser 453 and a second diffuser 455, the diffuser 450 can be easily manufactured using an injection method.

The first fixed blade 454 provided in the first diffuser 453 has a nonlinear thickness from the leading edge (LE2) of the first fixed blade 454 to the trailing edge (TE2) of the first fixed blade 454. It can have an airfoil shape that changes dramatically.

Here, the leading edge LE2 of the first fixed blade 454 refers to an edge located on the upstream side in the direction in which the air flowing into the first diffuser 453 moves, and the first fixed blade 454 The trailing edge (TE2) of ) refers to an edge located downstream in the direction in which the air flowing into the first diffuser 453 moves.

The third length L3 of the hub side end 454a from the leading edge LE2 of the first fixed blade 454 to the trailing edge TE2 of the first fixed blade 454 is the length L3 of the first fixed blade 454. ) may be formed to be the same as the fourth length L4 of the shroud side end 454b from the leading edge LE2 to the trailing edge TE2 of the first fixed blade 454.

And at a position spaced apart by the same distance from the trailing edge TE2 of the first fixed blade 454 toward the leading edge LE2 of the first fixed blade 454, the hub side end of the first fixed blade 454 The thickness of 454a may be thicker than the thickness of the shroud side end 454b of the first fixed blade 454.

Here, the hub side end 454a of the first fixed blade 454 refers to the inner end of the first fixed blade 454, and the shroud side end 454b of the first fixed blade 454 refers to the hub side end. The part located on the opposite side of (454a) refers to the outer end of the first fixed blade 454.

Referring to FIGS. 19 and 21, as an example, at a position spaced apart by 2M from the trailing edge (TE2) of the first fixed blade 454 toward the leading edge (LE2), the hub side end 454a is approximately 1.5 mm, and the shroud side end 454b has a thickness of approximately 0.8 mm.

According to this configuration, since the thickness of the hub-side end 454a of the first fixed blade 454 is thicker than the thickness of the shroud-side end 454b of the first blade 454, the flow of air with centrifugal force is controlled. 1 It is concentrated on the shroud side end (454b) of the fixed blade (454).

Therefore, it is possible to secure the flow path area by reducing the thickness of the shroud-side end 454b of the first fixed blade 454, and the flow of air passing between the first fixed blades 454 can be improved, Because of this, the suction power and suction efficiency of the vacuum cleaner can be improved.

In addition, since the thickness of the shroud-side end 454b of the first fixed blade 454 is thinner than the thickness of the hub-side end 454a of the first fixed blade 454, after injecting the first diffuser 453 The operation of taking out the first diffuser 453 from the mold can be easily performed. Accordingly, manufacturability of the first diffuser 453 can be improved.

In addition, since the thickness of the hub-side end 454a of the first fixed blade 454 is thicker than the thickness of the shroud-side end 454b of the first fixed blade 454, the strength of the first fixed blade 454 is increased. It can be improved.

The distance D5 between the portion A3 having the maximum thickness of the hub side end 454a of the first fixed blade 454 and the leading edge LE2 of the first fixed blade 454 is ) may be formed to be smaller than the distance D6 between the portion A4 having the maximum thickness of the hub side end 454b and the trailing edge TE2 of the first fixed blade 454.

And, the distance D7 between the portion A4 having the maximum thickness of the shroud side end 454b of the first fixed blade 454 and the leading edge LE2 of the first fixed blade 454 is the first fixed blade 454. It may be formed to be smaller than the distance D8 between the portion A4 having the maximum thickness of the shroud side end 454b of the blade 454 and the trailing edge TE2 of the first fixed blade 454.

The portion A3 having the maximum thickness of the hub side end 454a of the first fixed blade 454 may be located between 0.3L3 and 0.45L3 from the leading edge LE2 of the first fixed blade 454.

And, the portion (A4) having the maximum thickness of the shroud side end (454b) of the first fixed blade 454 is located between 0.3L3 and 0.4L3 from the leading edge (LE2) of the first fixed blade 454. You can.

And the thickness of the hub side end 454a of the first fixed blade 454 is 16th position (P16-1 and P16-2) > 15th position (P15) > 17th position (P17) > 14th position (P14). )> It can be changed in the order of the 18th position (P18).

And the thickness of the shroud side end 454b of the first fixed blade 454 is 20th position (P20-1 and P20-2) > 21st position (P21) > 19th position (P19) > 22nd position ( It can be changed in the order of P22).

Referring to FIG. 22, the thickness of the hub side end 454a of the first fixed blade 454 ranges from 0.66mm (thickness at the 18th position (P18) in Example 7) to 2.8mm (thickness at the 16th position (P18) in Example 9). (thickness at P16-1 and P16-2)), and the thickness of the shroud side end 454b is 0.1 mm (19th position (P19) and 22nd position (Example 8) Thickness at P22)) to 1.8 mm (thickness at the 20th position (P20-1 and P20-2) of Example 9) may vary non-linearly.

The thickness was set based on the experiments in Examples 7 to 9 of FIG. 22. Referring to FIG. 22, the thickness of the hub side end 454a of the first fixed blade 454 is It can be seen that the efficiency of the vacuum cleaner is excellent when the thickness of the end portion 454b on the shroud side satisfies the above range.

In particular, referring to FIG. 22, as in Example 7, the thickness of the hub side end 454a of the first fixed blade 454 changes non-linearly within the range of 0.66 mm to 2.3 mm, and the shroud side end ( It can be seen that when the thickness of 454b) changes non-linearly within the range of 0.3 mm to 1.3 mm, the efficiency of the vacuum cleaner is the best.

In the first fixed blades 454 adjacent to each other, the leading edge LE2 of one first fixed blade 454 and the trailing edge TE2 of the other first fixed blade 454 are shown in FIG. 16 As shown, they may not overlap each other in the axial direction.

That is, when viewed in the axial direction, the two adjacent first fixed blades 454 may not overlap each other.

According to this configuration, since overlap between the first fixed blades 454 is suppressed, the operation of removing the first diffuser 453 from the mold after injecting the first diffuser 453 can be easily performed. Accordingly, manufacturability of the first diffuser 453 can be improved.

The thickness of the hub-side end of the second fixed blade 456 may be the same as the thickness of the shroud-side end of the second fixed blade 456.

Here, the hub-side end of the second fixed blade 456 refers to the inner end of the second fixed blade 456, and the shroud-side end of the second fixed blade 456 refers to the outside of the second fixed blade 456. Refers to the end of the side.

If the first diffuser 453 with the first fixed blade 454 and the second diffuser 455 with the second fixed blade 456 are used together, pressure loss during air intake can be minimized.

The number of second fixed blades 456 may be greater than the number of first fixed blades 454.

The third entrance angle θ5 of the leading edge LE2 of the first fixed blade 454 may be formed to be larger than the third exit angle θ6 of the trailing edge TE2 of the first fixed blade 454. , the fourth entrance angle θ7 of the leading edge LE3 of the second fixed blade 456 may be formed to be larger than the fourth exit angle θ8 of the trailing edge TE3 of the second fixed blade 456. there is.

Referring to FIG. 24, it can be seen that when the difference between the fourth inlet angle θ7 and the third outlet angle θ6 is less than 25 degrees or exceeds 35 degrees, the efficiency of the vacuum cleaner decreases.

Therefore, it is preferable that the fourth inlet angle θ7 is formed to be 25 to 35 degrees larger than the third outlet angle θ6.

Although the embodiments of the present specification have been described above with reference to the attached drawings, those skilled in the art will understand that the present specification can be implemented in other specific forms without changing the technical idea or essential features. You will be able to understand it. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive.

Claims

A vacuum cleaner including an impeller having a hub and a twist-type rotating blade disposed on the hub, and a diffuser disposed to guide the air discharged from the impeller. In

The rotating blade is,

It has an airfoil shape in which the thickness from the leading edge of the rotating blade to the trailing edge of the rotating blade changes nonlinearly,

The first length of the hub-side end from the leading edge of the rotary blade to the trailing edge of the rotary blade is the second length of the shroud-side end from the leading edge of the rotary blade to the trailing edge of the rotary blade. Formed to be longer than 2 length,

At a position spaced by the same distance from the trailing edge of the rotary blade toward the leading edge of the rotary blade, the thickness of the hub-side end of the rotary blade is thicker than the thickness of the shroud-side end of the rotary blade. Vacuum cleaner formed.
In paragraph 1:

At the leading edge of the rotating blade,

The first entrance angle of the hub-side end of the rotary blade is 42 degrees to 52 degrees, and the second entrance angle of the shroud-side end of the rotary blade is 50 degrees to 60 degrees,

At the trailing edge of the rotating blade,

A first outlet angle of the hub-side end of the rotary blade is 33 degrees to 43 degrees, and a second outlet angle of the shroud-side end of the rotary blade is 36 degrees to 46 degrees.
In paragraph 2,

The first inlet angle is smaller than the second inlet angle, and the first outlet angle is smaller than the second outlet angle.
In paragraph 3,

The first entrance angle is 48 degrees, the second entrance angle is 55 degrees,

The first outlet angle is 38 degrees, and the second outlet angle is 42 degrees.
In paragraph 3,

A vacuum cleaner wherein the portion having the maximum thickness of the hub-side end of the rotary blade and the portion having the maximum thickness of the shroud-side end of the rotary blade are located at different positions in the longitudinal direction of the rotary blade.
In paragraph 5,

The distance between the portion having the maximum thickness of the hub-side end of the rotating blade and the leading edge of the rotating blade is the distance between the portion having the maximum thickness of the hub-side end of the rotating blade and the trailing edge of the rotating blade. It is formed larger than the street,

The distance between the portion having the maximum thickness of the shroud-side end of the rotating blade and the leading edge of the rotating blade is equal to the portion having the maximum thickness of the shroud-side end of the rotating blade and the trailing edge of the rotating blade. A vacuum cleaner that is formed smaller than the distance between them.
In paragraph 6:

When the first length is L1 and the second length is L2,

The portion having the maximum thickness of the hub side end of the rotary blade is located between 0.5L1 and 0.7L1 from the leading edge of the rotary blade,

The portion having the maximum thickness of the shroud-side end of the rotating blade is located between 0.2L2 and 0.4L2 from the leading edge of the rotating blade.
In any one of paragraphs 1 to 7,

The diffuser includes a first diffuser located below the hub and having a plurality of first fixed blades, and a second diffuser located below the first diffuser and having a plurality of second fixed blades,

The first fixed blade has an airfoil shape in which the thickness from the leading edge of the first fixed blade to the trailing edge of the first fixed blade changes non-linearly,

The third length of the hub side end from the leading edge of the first fixed blade to the trailing edge of the first fixed blade is from the leading edge of the first fixed blade to the trailing edge of the first fixed blade. It is formed equal to the fourth length of the shroud side end up to,

At a position spaced by the same distance from the trailing edge of the first fixed blade toward the leading edge of the first fixed blade, the thickness of the hub side end of the first fixed blade is greater than or equal to the above of the first fixed blade. A vacuum cleaner that is thicker than the thickness of the end of the shroud.
In paragraph 8:

The distance between the portion having the maximum thickness of the hub-side end of the first fixed blade and the leading edge of the first fixed blade is equal to the portion having the maximum thickness of the hub-side end of the first fixed blade and the first fixed blade. is formed to be smaller than the distance between the trailing edges of the blades,

The distance between the part having the maximum thickness of the shroud-side end of the first fixed blade and the leading edge of the first fixed blade is the distance between the part having the maximum thickness of the shroud-side end of the first fixed blade and the leading edge of the first fixed blade. 1 A vacuum cleaner configured to be smaller than the distance between the trailing edges of fixed blades.
In paragraph 9:

When the third length and the fourth length are L3,

The portion having the maximum thickness of the hub side end of the first fixed blade is located between 0.3L3 and 0.45L3 from the leading edge of the first fixed blade,

The portion having the maximum thickness of the shroud-side end of the first fixed blade is located between 0.3L3 and 0.4L3 from the leading edge of the first fixed blade.
In paragraph 10:

A vacuum cleaner in which, in the first fixed blades adjacent to each other, the leading edge of one first fixed blade and the trailing edge of the other first fixed blade do not overlap each other in the axial direction.
In paragraph 10:

A vacuum cleaner in which the thickness of the hub-side end of the second fixed blade is formed to be the same as the thickness of the shroud-side end of the second fixed blade.
In paragraph 12:

A vacuum cleaner in which the number of second fixed blades is greater than the number of first fixed blades.
In paragraph 12:

A third entrance angle of the leading edge of the first fixed blade is formed to be larger than a third exit angle of the trailing edge of the first fixed blade,

A vacuum cleaner wherein the fourth entrance angle of the leading edge of the second fixed blade is formed to be larger than the fourth exit angle of the trailing edge of the second fixed blade.
In paragraph 14:

The fourth inlet angle is formed to be larger than the third outlet angle by 25 degrees to 35 degrees.