Impeller
Patent Information
- Authority / Receiving Office
- KR · KR
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-02-05
- Publication Date
- 2026-08-12
Smart Images
Figure PAT00001_ABST
Abstract
Description
Technology Field
[0001] The present invention relates to an impeller, and more specifically, to an impeller capable of improving performance without changing the layout in which the impeller is applied. Background Technology
[0002] A fan motor generates suction force through the rotation of a fan (impeller) connected to the motor's rotating shaft. Fan motors are used in various devices. They are used in home appliances such as vacuum cleaners and air conditioners, as well as in automobiles. For example, when a fan motor is used in a vacuum cleaner, the air sucked in by the motor flows into the vacuum cleaner's filter.
[0003] Generally, a fan motor is composed of a motor and an impeller connected to the motor's rotational shaft. This impeller includes a hub rotatably installed and a plurality of blades coupled to the hub, forming a flow path between the blades.
[0004] The fluid enters the impeller's center of rotation through the inlet, flows along the path of the space where the blades are arranged, and is pressurized. The pressurized fluid then flows radially along the impeller and is discharged to the outside.
[0005] In order to increase the flow pressure of the fluid passing through the impeller or to increase the amount of fluid sucked into the impeller, the contact area between the fluid and the blades must be increased, and a method is required to increase the output of the impeller without increasing the overall volume of the impeller. The problem to be solved
[0006] The present invention was created to improve upon the problems of conventional impellers as described above, and aims to provide an impeller that improves performance by increasing the air contact area of the blades without changing the layout in which the impeller is applied.
[0007] In addition, the purpose is to provide an impeller that offers high space utilization by providing space for surrounding parts to be inserted inside the hub, and can reduce the overall axial length of the product on which the impeller is installed. means of solving the problem
[0008] To achieve the above-mentioned purpose, the impeller according to the present invention comprises: a hub installed on a rotating shaft; and a plurality of blades installed on one surface of the hub, extending from an inner end adjacent to the rotating shaft to an outer end, wherein at least one of the plurality of blades extends along the forward or reverse direction of the airflow so that at least a portion of the root is spaced apart from the hub.
[0009] The blade comprises: a blade body; a leading edge located at the upstream end of the blade body with respect to the direction of airflow flowing along the blade body; and a trailing edge located at the downstream end of the blade body with respect to the direction of airflow flowing along the blade body; and at least one of the plurality of blades may be spaced apart from the hub, such that at least one of the leading edge and the trailing edge is positioned.
[0010] When the vertex where the leading edge meets the root is called the first point and the vertex where the leading edge meets the tip is called the second point, at least one of the plurality of blades may be positioned such that the first point is positioned axially higher than the top of the hub and the second point is positioned axially higher than the first point.
[0011] The blade body may be characterized in that the shortest length from a virtual horizontal line contacting the uppermost end surface in the axial direction of the hub to the second point is 15% or less of the axial length of the hub.
[0012] When the vertex where the leading edge meets the root is called the first point, at least one of the plurality of blades may be characterized in that the diameter of the virtual circle connecting the first point with the axis of rotation is smaller than the minimum diameter of the hub.
[0013] When the vertex where the trailing edge meets the root is called the third point and the vertex where the trailing edge meets the tip is called the fourth point, at least one of the plurality of blades may be characterized in that the diameter of the virtual circle connecting the third point with the axis of rotation of the hub is larger than the maximum diameter of the hub.
[0014] The blade may be characterized in that the shortest length from the virtual vertical line contacting the outer surface of the maximum radius of the hub to the fourth point is 15% or less of the axial length of the hub.
[0015] The blade body may have the leading edge formed to be perpendicular or inclined with respect to the axis of rotation.
[0016] The blade body may be positioned so that the leading edge forms an angle of 50 degrees or more and 90 degrees or less with respect to the axis of rotation.
[0017] The blade body may have the trailing edge formed to be parallel or inclined with respect to the axis of rotation.
[0018] The blade body may be positioned so that the trailing edge forms an angle of 0 degrees or more and 60 degrees or less with respect to the axis of rotation.
[0019] The hub comprises: a coupling portion fixed to a rotating shaft; and a hub body disposed to surround the coupling portion and having a plurality of blades, wherein the coupling portion may be characterized in that its axial length is shorter than the axial length of the hub body.
[0020] The above-mentioned connecting part may be characterized in that one end forms a step with one end of the hub body, and the other end forms a step with the other end of the hub body.
[0021] In addition, at least one of the plurality of blades may have an extension portion disposed on the outside of the hub, wherein at least one end and the other end extend in the direction of airflow based on the forward or reverse direction of the airflow flowing along the blade.
[0022] The root of the above extension may be spaced apart from the hub.
[0023] In addition, at least one of the plurality of blades may be positioned such that at least one of the leading edge and the trailing edge is spaced apart from the hub. Effects of the invention
[0024] As explained above, the impeller according to the present invention has the effect of improving the performance of the impeller by increasing the air contact area of the blade without changing the layout in which the impeller is applied.
[0025] In addition, it provides space for surrounding parts to be inserted into the inner side of the hub, thereby maximizing space utilization and effectively reducing the overall axial length of the product where the impeller is installed. Brief explanation of the drawing
[0026] FIG. 1 is a perspective view of a centrifugal impeller according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional view of a centrifugal impeller according to an embodiment of the present invention. Figure 3 is an enlarged view of a portion of Figure 2 to illustrate the leading edge. FIG. 4 is a cross-sectional view of a centrifugal impeller according to an embodiment of the present invention. Figure 5 is an enlarged view of a portion of Figure 4 to illustrate the trailing edge. FIG. 6 is a perspective view of an extended centrifugal impeller with a long axial length having a blade according to one embodiment of the present invention applied thereto. Figure 7 is a cross-sectional view of Figure 6. FIG. 8 is a perspective view of a blade according to the second embodiment of the present invention applied to an extended centrifugal impeller with a long axial length. FIG. 9 is a perspective view of a blade according to the third embodiment of the present invention applied to an extended centrifugal impeller with a long axial length. FIG. 10 is a perspective view of an axial flow impeller with a blade according to one embodiment of the present invention applied thereto. Figure 11 is a cross-sectional view of Figure 10. FIG. 12 is a perspective view of a state in which a blade according to the second embodiment of the present invention is applied to an axial flow impeller. FIG. 13 is a perspective view of an axial flow impeller with a blade according to the third embodiment of the present invention applied thereto. FIG. 14 is a perspective view of a blade according to one embodiment of the present invention applied to an axial flow impeller of a different type. Fig. 15 is a cross-sectional view of Fig. 14. FIG. 16 is a perspective view of a fan motor including the impeller of FIG. 14. Figure 17 is a partial cross-sectional view of Figure 16. Specific details for implementing the invention
[0027] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings.
[0028] The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. This is not intended to limit the present invention to specific embodiments, and should be interpreted to include all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.
[0029] FIGS. 1 to 5 illustrate drawings for explaining a centrifugal impeller according to an embodiment of the present invention.
[0030] The centrifugal impeller (600) can suck in air in the axial direction when rotating and blow it in an inclined direction between the axial direction and the centrifugal direction.
[0031] The impeller (600) may include a hub (610) installed on the rotating shaft (111) and at least one blade (620) formed on the outer surface of the hub (610). The impeller (600) can generate a suction force to draw in air as it rotates around the center of the rotating shaft (111) when the rotating shaft (111) rotates, and can draw in air through the air intake port (411) of the impeller cover (400) to be described later.
[0032] The hub (610) can be connected to the end of the rotating shaft (111) located inside the impeller cover (400). That is, the hub (610) can be coupled to the top of the rotating shaft (111). Such a hub (610) may include a coupling part (611) and a hub body (612).
[0033] The coupling portion (611) is formed in a hollow shape and has a shaft coupling hole (611a) in which a rotating shaft (111) is installed on the inside.
[0034] The hub body (612) is positioned to surround the coupling portion (611) and is provided with at least one blade (620) on its outer surface. The hub body (612) may be formed in a shape in which the outer diameter gradually expands toward one side in the axial direction. Specifically, the other end in the axial direction of the hub body (612) may be integrally provided with the end of the coupling portion (611) and may be formed in a shape in which the outer diameter gradually expands toward one side in the axial direction.
[0035] The hub (610) may be formed such that the outer diameter of one axial end adjacent to the air intake (411) formed in the impeller cover (400) is the smallest, and the outer diameter of the other axial end further away from the air intake (411) is the largest. The maximum outer diameter of the hub (610) may be the outer diameter of the end opposite the air intake (411) among the two ends of the hub (610).
[0036] And, the hub (610) of the centrifugal impeller (600) may have an axial end surface that is an air intake surface (612a) and an axial end surface that is an air discharge surface (612b) having the maximum outer diameter.
[0037] A plurality of blades (620) may be formed on the outer surface of the hub (610), and the plurality of blades (620) may be spaced apart from each other along the circumferential direction of the impeller (600).
[0038] Such blades (620) may include a blade body (621), a leading edge (622), and a trailing edge (623). The blade body (621) may be formed in a plate shape with an inclined or curved shape, and both sides thereof may include a pressure-side surface and a suction-side surface. The blade body (621) may be formed in a three-dimensional shape.
[0039] The blade body (621) may have a tip (625) located at the outermost point relative to the central axis of the hub (610) and a root (624) located at the innermost point relative to the central axis of the hub (610).
[0040] Additionally, the leading edge (622) is located at the upstream end (tip) of the blade body (621) based on the direction of air flow along the blade body (621).
[0041] The trailing edge (623) is located at the downstream end (rear end) of the blade body (621) based on the direction of airflow flowing along the blade body (621).
[0042] That is, the air passes through the leading edge (622) first, flows along the blade body (621), passes through the trailing edge (623), and is discharged.
[0043] Also, the blade body (621) may have a leading edge (622) and a trailing edge (623) connected to a tip (625) and a root (624). Among the edges connecting the leading edge (622) and the trailing edge (623) of the blade body (621), the end adjacent to the hub (610) may be called the root (624), and the opposite end may be called the tip (625).
[0044] Additionally, in the shape of the impeller (600) in which a plurality of blades (620) are arranged, the main line connecting the tips (625) is formed as a straight line or a curve in which the outer diameter increases from the top to the bottom in the axial direction, and the inner surface of the impeller cover (400), which will be described later, can be formed to correspond to the main line of the impeller (600). That is, the plurality of tips (625) are arranged to contact the inner surface of the impeller cover (400) at a constant distance.
[0045] The impeller (600) according to the present invention has at least one blade body (621) in contact with the leading edge (622) of at least one blade (620) and at least one blade body (621) in contact with the trailing edge (623) of the blade body (620) extended along the forward or reverse direction of the airflow and extended so as to protrude from the axial end surface of the hub (610). In this blade (620), at least a portion of the root (624) of the blade body (621) is spaced apart from the hub (610), and the edges (622, 623) of the extended portion are spaced apart from the hub (610).
[0046] Accordingly, the blade body (621) is positioned such that a portion of it contacts the hub (610) and is placed on the outer surface of the hub (610), while the remainder does not contact the hub (610). In the upstream portion of the blade body (621) that does not contact the hub (610), the root (624) is positioned radially inward from the outer surface of the minimum diameter of the hub (610). And in the downstream portion of the blade body (621) that does not contact the hub (610), the root (624) is positioned radially outward from the outer surface of the maximum diameter of the hub (610).
[0047] That is, the blade body (621) is provided with at least one extension (626), and the extension (626) is positioned protruding from the hub (610) without contacting the hub (610).
[0048] The extension (626) may be provided such that the front end of the blade body (621) extends in the reverse direction of the airflow, or the rear end of the blade body (621) extends in the forward direction of the airflow. Additionally, the blade body (621) may have the extension (626) at its front end, the extension (626) at its rear end, or the extension (626) at both its front and rear ends. At this time, the forward direction of the airflow refers to the direction of flow in which air sucked in through the air intake (411) flows along the blade body (621) but moves away from the air intake (411).
[0049] Additionally, the impeller (600) may include a blade (620) equipped with an extension (626) and a blade (620) not equipped with an extension (626), and as an example, the blade (620) equipped with an extension (626) and the blade (620) not equipped with an extension (626) may be arranged alternately along the circumferential direction.
[0050] And, the extension (626) is positioned such that at least a portion of the root is spaced apart from the hub (610) and protrudes from the end of the hub (610) and is positioned on the outside of the hub (610).
[0051] Through this, the blade (620) has the effect of increasing the flow pressure and increasing the suction flow rate without increasing the volume of the impeller cover (400) that accommodates the impeller (600), as the surface area of the blade body (621) in contact with air is widened. The extension part (626), which extends from the blade body (621) and is spaced apart from the hub (610), is placed in the empty space around the existing impeller cover (400), thereby utilizing the space between surrounding parts.
[0052] For example, as illustrated in FIGS. 1 to 5, a plurality of blades (620) provided in an impeller (600) may have both a blade body (621) in contact with the leading edge (622) and a blade body (621) in contact with the trailing edge (623) extended. However, although not illustrated in the drawings, the blade body (621) in contact with the leading edge (622) and the blade body (621) in contact with the trailing edge (623) may be extended only in some of the plurality of blades (620).
[0053] First, a blade body (621) that contacts the leading edge (622) is described as an extended blade (620). The blade body (621) has a leading edge that extends in the reverse direction of the airflow but can also extend in the axial direction of the hub (610), and the leading edge (622) is located at the extended end. Accordingly, the leading edge (622) is positioned spaced apart from the hub (610), specifically, spaced axially apart from the air intake surface (612a) of the hub (610).
[0054] Referring to FIG. 2, when the vertex where the leading edge (622) meets the root (624) is called the first point (622a) and the vertex where the leading edge (622) meets the tip (625) is called the second point (622b), and when a virtual horizontal line that contacts the outermost side of the air intake surface (612a) of the hub (610) is called the first reference line, the first point (622a) and the second point (622b) can be positioned on one side in the axial direction from a virtual extension plane extending the first reference line. Furthermore, the first point (622a) can be positioned on one side in the axial direction relative to the hub (610), and the second point (622b) can be positioned on one side in the axial direction relative to the first point. In the drawing, the first point (622a) is located above the air intake surface (612a) of the hub (610), and the second point (622b) is located above the first point (622a).
[0055] As the blade body (621) extends along the reverse direction of the airflow, the inner vertex of the leading edge (622) may be positioned to protrude radially inward from the hub (610). That is, the diameter of the virtual circle connecting the first point (622a) with the axis of rotation (111) may be smaller than the minimum diameter of the hub (610).
[0056] At this time, the blade body (621) may be formed by extending it by a predetermined length. Specifically, the blade body (621) is formed by extending it only by a predetermined length such that the straight length (ℓ1) from a virtual extension plane extending the air intake surface (612a) of the hub (610) to a second point (622b) is 15% or less of the axial length (H) of the hub (610). Here, the axial length (H) of the hub (610) may be the distance from the upper end to the lower end of the hub (610).
[0057] Also, referring to FIG. 3, the leading edge (622) may be positioned perpendicular to the rotation axis (111) of the hub (610) or at an angle to the rotation axis (111) of the hub (610). Specifically, the leading edge (622) may be positioned to form an angle of 50 degrees or more and 90 degrees or less with respect to the rotation axis (111).
[0058] Through this, the blade (620) has the effect of increasing the flow pressure and increasing the suction flow rate without increasing the volume of the impeller cover (400) that accommodates the impeller (600) as the surface area of the blade body (621) in contact with air is widened.
[0059] Next, the blade body (621) that contacts the trailing edge (623) is described as an extended blade (620).
[0060] The blade body (621) has a rear end that extends along the direction of airflow but can also extend in the direction of inclination of the outer surface of the hub (610), and a trailing edge (623) is located at the extended end. Accordingly, the trailing edge (623) is positioned spaced apart from the hub (610), specifically, spaced radially apart from the air discharge surface (612b) of the hub (610).
[0061] Referring to FIG. 4, when the vertex where the trailing edge (623) meets the root (624) is called the third point (623a) and the vertex where the trailing edge (623) meets the tip (625) is called the fourth point (623b), a virtual vertical line that contacts the outermost side of the air discharge surface (612b) can be called the second reference line. At this time, the third point (623a) and the fourth point (623b) can be positioned radially outward from the second reference line of the hub (610). That is, the diameter of the virtual circle connecting the third point (623a) with the rotation axis (111) of the hub (610) as the center can be larger than the maximum diameter of the hub (610).
[0062] At this time, the blade body (621) may be formed by extending it by a preset length, specifically, the blade body (621) is formed by extending it only by a preset length such that the straight length (ℓ2) from the virtual extension surface extending the air discharge surface (612b) of the hub (610) to the fourth point (623b) is 15% or less of the axial length (H) of the hub (610).
[0063] Also, referring to FIG. 5, the trailing edge (623) may be positioned parallel to the axis of rotation (111) of the hub (610) or at an angle to the axis of rotation (111) of the hub (610). Specifically, the trailing edge (623) may be positioned to form an angle of 0 degrees or more and 60 degrees or less with respect to the axis of rotation (111).
[0064] Through this, the blade (620) has the effect of increasing the flow pressure and increasing the suction flow rate without increasing the volume of the impeller cover (400) that accommodates the impeller (600) as the surface area of the blade body (621) in contact with air is widened.
[0066] [Expandable Mixed-flow Impeller]
[0067] FIGS. 6 to 9 illustrate drawings for explaining an extended centrifugal impeller with a long axial length according to an embodiment of the present invention.
[0068] In the extended centrifugal impeller (700), at least one of the multiple blades (720) has at least one of the leading edge and trailing edge extended, so that at least one of the leading edge (622) and trailing edge (723) can be located on the outside of the hub (710).
[0069] Referring to FIGS. 6 and 7, the expanded centrifugal impeller (700) is formed such that the hub body (712) is extended axially compared to the hub body (612) of a general centrifugal impeller, and the axial length of the hub body (712) may be longer than the axial length of the coupling part (711). For example, the hub body (712) is formed in a shape in which the diameter gradually expands toward one side in the axial direction, and one end of the hub body (712) may be formed to have a step difference with the coupling part (711).
[0070] Accordingly, peripheral components such as bearings can be placed in the space within the internal space of the hub body (712) where the coupling part (711) is not placed, and the axial length of the fan motor, etc. to which the impeller (700) is applied can be reduced.
[0071] The blade (720) is formed such that the leading and trailing ends of the blade body (721) extend along the forward or reverse direction of the airflow, and the leading edge (722) and trailing edge (723) may be spaced apart from the hub (710).
[0072] That is, when the vertex where the leading edge (722) meets the root is called the first point (722a) and the vertex where the leading edge (722) meets the tip is called the second point (722b), the first point (722a) is positioned so as not to be adjacent to the hub (710) and is positioned above the hub (710).
[0073] And, when the vertex where the trailing edge (723) meets the root is called the third point (723a) and the vertex where the trailing edge (723) meets the tip is called the fourth point (723b), the third point (723a) is positioned so as not to be adjacent to the hub (710) and is positioned radially outward from the outer surface of the other end of the axial direction having the maximum outer diameter of the hub (710).
[0074] FIG. 8 illustrates an extended centrifugal impeller (700) with a blade (730) applied according to another embodiment. According to FIG. 8, the blade (730) is formed with only its leading edge extending along the direction of airflow, and the leading edge (732) of the blade body (731) may be spaced apart from the hub (710).
[0075] That is, when the vertex where the leading edge (732) meets the root is called the first point (732a) and the vertex where the leading edge (732) meets the tip is called the second point (732b), the first point (732a) is positioned so as not to be adjacent to the hub (710) and is positioned above the hub (710).
[0076] And, when the vertex where the trailing edge (733) meets the root is called the third point (733a) and the vertex where the trailing edge (733) meets the tip is called the fourth point (733b), the third point (733a) is positioned adjacent to the hub (710) and is positioned on the outer surface of the hub (710).
[0077] FIG. 9 illustrates an extended centrifugal impeller (700) with a blade (740) applied according to another embodiment. According to FIG. 9, the blade (740) is formed so that only the rear end extends along the direction of airflow, and the trailing edge (743) may be positioned spaced apart from the hub (710).
[0078] That is, when the vertex where the leading edge (742) of the blade body (741) meets the root is called the first point (742a) and the vertex where the leading edge (742) meets the tip is called the second point (742b), the first point (742a) is positioned adjacent to the hub (710) and is positioned on the outer surface of the hub (710).
[0079] And, when the vertex where the trailing edge (743) meets the root is called the third point (743a) and the vertex where the trailing edge (743) meets the tip is called the fourth point (743b), the third point (743a) is positioned so as not to be adjacent to the hub (710) and is positioned radially outward from the outer surface of the other end of the axial direction having the maximum outer diameter of the hub (710).
[0081] [Axial flow impeller]
[0082] FIGS. 10 to 13 illustrate drawings for explaining an axial flow impeller according to an embodiment of the present invention.
[0083] The axial flow impeller (800) is an impeller that sucks in air in the axial direction and blows it in the axial direction when rotating.
[0084] The hub (810) of the axial flow impeller (800) may be configured to include a coupling part (811), a hub body (812), and a connecting part (813). Referring to FIG. 11, the coupling part (811) is formed in a hollow shape and has a shaft coupling hole (811a) in which a rotating shaft (111) is installed on the inside. The hub body (812) is formed in a shape in which the outer diameter gradually expands toward one side in the axial direction, and is formed such that the inclination is closer to vertical compared to the axial flow impeller, and is arranged to surround the coupling part (811), and at least one blade (820) is provided on the outer surface. Alternatively, the outer diameter of the hub body (812) may be formed vertically. The connecting part (813) may be disposed between the coupling part (811) and the hub body (812) and may be integrally provided with the coupling part (811) and the hub body (812).
[0085] In this hub (810), the axial length of the hub body (812) is formed to be longer than the axial length of the connecting part (811), and both ends of the hub body (812) may be arranged to form a step with both ends of the connecting part (811). That is, one end of the connecting part (811) may form a step with one end of the hub body (812), and the other end may form a step with the other end of the hub body (812). Accordingly, peripheral components such as bearings may be placed in the upper or lower space of the connecting part (811) within the inner space of the hub body (812) in the drawing.
[0086] Also, the hub (810) of the axial flow impeller (800) can be said to have one end surface in the axial direction as an air intake surface and the other end surface in the axial direction as an air discharge surface.
[0087] Additionally, referring to FIGS. 10 and 11, the blade (820) is formed such that the leading edge and the trailing edge of the blade body (821) extend along the direction of airflow, and the leading edge (822) and the trailing edge (823) may be spaced apart from the hub (810).
[0088] That is, when the vertex where the leading edge (822) meets the root is called the first point (822a) and the vertex where the leading edge (822) meets the tip is called the second point (822b), the first point (822a) is positioned so as not to be adjacent to the hub (810) and is positioned above the hub (810).
[0089] And, when the point where the trailing edge (823) meets the root is called the third point (823a) and the point where the trailing edge (823) meets the tip is called the fourth point (823b), the third point (823a) is positioned so as not to be adjacent to the hub (810) and is positioned below the hub (810).
[0090] FIG. 12 illustrates an axial flow impeller (800) with a blade (830) applied according to another embodiment. According to FIG. 12, the blade (830) is formed with only its leading edge extending in the reverse direction of the airflow, and the leading edge (832) may be positioned spaced apart from the hub (810).
[0091] That is, when the vertex where the leading edge (832) of the blade body (831) meets the root is called the first point (832a) and the vertex where the leading edge (832) meets the tip is called the second point (832b), the first point (832a) is positioned so as not to be adjacent to the hub (810) and is positioned above the hub (810).
[0092] And, when the vertex where the trailing edge (833) meets the root is called the third point (833a) and the vertex where the trailing edge (833) meets the tip is called the fourth point (833b), the third point (833a) is positioned adjacent to the hub (810) and is positioned on the outer surface of the hub (810).
[0093] FIG. 13 illustrates an axial flow impeller (800) with a blade (840) applied according to another embodiment. According to FIG. 13, the blade (840) is formed so that only the rear end extends along the direction of airflow, and the trailing edge (843) may be positioned spaced apart from the hub (810).
[0094] That is, when the vertex where the leading edge (842) of the blade body (841) meets the root is called the first point (842a) and the vertex where the leading edge (842) meets the tip is called the second point (842b), the first point (842a) is positioned adjacent to the hub (810) and is positioned on the outer surface of the hub (810).
[0095] And, when the vertex where the trailing edge (843) meets the root is called the third point (843a) and the vertex where the trailing edge (843) meets the tip is called the fourth point (843b), the third point (843a) is positioned so as not to be adjacent to the hub (810) and is positioned below the hub (810).
[0097] [Other types of axial flow impellers]
[0098] FIGS. 14 and 15 illustrate drawings for explaining different types of axial flow impellers according to embodiments of the present invention.
[0099] The axial flow impeller (900) is positioned so that the connecting portion (913) of the hub (910) connects the end of the coupling portion (911) and the end of the hub body (912). In the drawing, the hub (910) is positioned to connect the upper end of the coupling portion (911) and the upper end of the hub body (912), and the lower side of the coupling portion (911) may provide a space where peripheral components such as bearings can be placed.
[0100] And, the blade (920) is formed such that the leading edge and the trailing edge of the blade body (921) extend along the direction of airflow, and the leading edge (922) and the trailing edge (923) can be spaced apart from the hub (910).
[0101] That is, when the vertex where the leading edge (922) of the blade body (921) meets the root is called the first point (922a) and the vertex where the leading edge (922) meets the tip is called the second point (922b), the first point (922a) is positioned so as not to be adjacent to the hub (910) and is positioned above the hub (910).
[0102] And, when the point where the trailing edge (923) meets the root is called the third point (923a) and the point where the trailing edge (923) meets the tip is called the fourth point (923b), the third point (923a) is positioned so as not to be adjacent to the hub (910) and is positioned below the hub (910).
[0104] [Fan Motor]
[0105] FIGS. 16 and 17 illustrate drawings for explaining a fan motor with an impeller installed according to an embodiment of the present invention.
[0106] Referring to FIGS. 16 and 17, a fan motor according to one embodiment of the present invention is described as follows.
[0107] The motor (100) may include a stator (120) and a rotor (110). The rotor (110) may be rotatably positioned inside the stator (120). The rotor (110) may be formed in a hollow cylindrical shape.
[0108] The rotor (110) may include a rotor core fixed to a rotation axis (111) and a magnet installed on the rotor core.
[0109] The rotor (110) can be mounted to surround a portion between one end and the other end of the rotation axis (111) in the axial direction.
[0110] The rotation axis (111) rotates together with the rotor (110) and can be supported by a bearing (112). The rotation axis (111) can be rotated by the rotor (110) while supported by the bearing (112).
[0111] An impeller (900) can be connected to the rotating shaft (111), and when the rotating shaft (111) rotates, the impeller (900) can rotate inside the impeller cover (600). Therefore, when the motor (100) rotates, the impeller (900) also rotates, generating a suction force that sucks in air.
[0112] The stator (120) can be mounted on the motor housing (300). The stator (120) can be mounted on the motor housing (300) and can be positioned to surround the rotor (110). The stator (120) can be mounted on the motor housing (300) by fastening members such as screws.
[0113] The stator (120) may be formed in a hollow cylindrical shape. The stator (120) may be mounted to surround the outer circumference of the rotor (110).
[0114] The stator (120) may include a stator core, one or more insulators coupled to the stator core, and a coil disposed on the insulator.
[0115] The motor bracket (200) can rotatably support the upper portion of the rotation axis (111) of the rotor (110). Additionally, a guide vane (500) can be attached to the upper portion of the motor bracket (200). The motor bracket (200) can be attached to the guide vane (500) to support the guide vane (500).
[0116] An upper bearing housing (210) may be provided in the central part of the motor bracket (200). An upper bearing (112) may be accommodated in the upper bearing housing (210). The upper bearing housing (210) may be formed in a shape that accommodates the upper bearing (112). For example, the upper bearing housing (210) may be formed in a cylindrical shape. The upper bearing (112) may be positioned radially outward of the rotation axis (111).
[0117] Meanwhile, the motor bracket (200) may be provided with a support member (220). For example, the support member (220) may be formed in a ring shape. Additionally, the support member (220) may have a predetermined height along the vertical direction.
[0118] Additionally, a bridge (230) may be provided between the upper bearing housing (210) and the support member (220). The bridge (230) can connect the upper bearing housing (210) and the support member (220). That is, one side of the bridge (230) may be connected to the upper bearing housing (210), and the other side may be connected to the support member (220). At this time, there is a height difference between the upper bearing housing (210) and the support member (220). Therefore, the upper end of the bridge (230) may be connected to the upper bearing housing (210), and the lower end may be connected to the support member (220).
[0119] A plurality of bridges (230) may be arranged along the circumferential direction on the outer side of the upper bearing housing (210). The bridges (230) can have any shape as long as they perform the function of connecting the upper bearing housing (210) and the support member (220). For example, the bridges (230) may be bar-shaped.
[0120] The motor housing (300) can accommodate at least a portion of the motor (100). The motor housing (300) may include a motor housing body (310), a lower bearing housing (320), and a connecting part (330).
[0121] The motor housing body (310) can accommodate one side in the longitudinal direction of the motor (100). For example, the motor housing body (310) can accommodate a portion of the lower side of the motor (100).
[0122] The motor housing (300) can be connected to the motor bracket (200). Accordingly, the motor (100) can be accommodated in the internal space formed by the connection of the motor housing (300) and the motor bracket (200).
[0123] The motor housing body (310) may have a hollow cylindrical shape overall. Air introduced into the motor (100) may be discharged to the outside of the motor housing body (310). For example, air introduced into the interior of the motor (100) may be discharged to the outside through an opening formed in the lower part of the motor housing body (310).
[0124] A lower bearing housing (320) on which a lower bearing (113) is seated may be provided at the lower part of the motor housing body (310). A connecting part (330) connecting the lower bearing housing (320) and the motor housing body (310) may be provided.
[0125] Meanwhile, a stator (120) may be coupled to the inner surface of the motor housing body (310). A rotor (110) may be rotatably positioned in the central part of the motor housing body (310). At this time, the lower part of the rotation shaft (111) may be rotatably supported by a lower bearing housing (320).
[0126] Accordingly, the upper part of the rotation shaft (111) can be rotatably supported in the upper bearing housing (210). Additionally, the lower part of the rotation shaft (111) can be rotatably supported in the lower bearing housing (320).
[0127] A guide vane (500) may be provided between the impeller (900) and the motor (100).
[0128] The guide vane (500) can guide the flow of air discharged from the impeller (900).
[0129] The guide vane (500) may include an inner wall (510), an outer wall (520), and a vane blade (530). A plurality of vane blades (530) may be provided along the circumferential direction between the inner wall (510) and the outer wall (520).
[0130] The inner wall (510) may be formed in a cylindrical shape with a closed upper portion. An opening may be formed in the inner wall (510) into which the upper bearing housing (210) of the motor bracket (200) is inserted. The shape of the opening in the inner wall (510) may correspond to the shape of the upper bearing housing (210). For example, the opening may be a circular hole.
[0131] At least a portion of the motor bracket (200) can be accommodated inside the inner wall (510). Additionally, a plurality of vane blades (530) can be formed along the circumferential direction on the outer surface of the inner wall (510).
[0132] The outer wall (520) may be formed in a cylindrical shape. The outer wall (520) may be positioned radially outward from the inner wall (510).
[0133] The impeller cover (400) can accommodate an impeller (900) inside. The impeller cover (400) may be configured as a roughly hollow cylinder. An opening at the top of the impeller cover (400) may be an air intake (411) into which air is introduced.
[0134] The impeller cover (400) may increase in diameter from top to bottom. The diameter of the outer surface of the impeller cover (400) may be equal to or slightly smaller than the diameter of the inner surface of the outer wall (520) of the guide vane (500). Accordingly, at least a portion of the outer surface of the impeller cover (400) may be joined to the inner surface of the outer wall (520) of the guide vane (500).
[0135] The impeller (900) is installed on the rotation shaft (111) and placed inside the impeller cover (400). The impeller (900) is placed in the upper space of the motor housing (300), and the hub (910) of the impeller (900) can be placed at a predetermined distance in the axial direction from the motor housing (300).
[0136] At this time, the impeller (900) is formed such that the leading edge (922) extends to the air intake (411) of the impeller cover (400) as the leading edge (922) of the blade (920) is formed by extending along the direction of air flow. The upper end of the impeller cover (400) is provided to form a step with the upper surface of the hub (910), and the extended part of the blade body (921) can increase the output efficiency of the fan motor by utilizing the space created by the step.
[0137] Additionally, as the trailing edge (923) is positioned at least partially on the outside of the motor housing (300), an extended portion of the blade body (921) is positioned in the remaining space between the impeller (900) and the guide vane (500) to further increase the pressure of the discharged air.
[0138] Accordingly, the airflow path length of the blade (920) increases, the performance of the impeller improves, and the output efficiency of the fan motor can be increased.
[0139] As the leading edge (922) is positioned adjacent to the upper end of the impeller cover (400), the air intake flow rate can be increased and the contact area with air can be increased, thereby increasing output efficiency.
[0140] Although the present invention has been described in detail through specific embodiments, this is for the purpose of specifically explaining the invention and is not limited thereto. It is evident that modifications or improvements to the present invention are possible by those skilled in the art within the technical scope of the invention.
[0141] All simple variations or modifications of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be clarified by the appended claims. Explanation of the symbols
[0142] 600: Impeller 610: Hub 611: Joint 612: Herb Body 620: Blade 621: Blade body 622: Reading Edge 622a: 1st point 622b: 2nd branch 623: Trailing Edge 623a: 3rd point 623b: 4th point 624: Root 625: Tip
Claims
Claim 1 An impeller comprising: a hub installed on a rotating shaft; and a plurality of blades installed on one surface of the hub extending from an inner side adjacent to the rotating shaft in an outer direction; wherein, when the inner end of the blade adjacent to the hub is called a root and the outer end is called a tip, at least one of the plurality of blades extends along the forward or reverse direction of the airflow so that at least a portion of the root is spaced apart from the hub. Claim 2 The impeller according to claim 1, wherein the blade comprises: a blade body; a leading edge located at the upstream end of the blade body with respect to the direction of air flow along the blade body; and a trailing edge located at the downstream end of the blade body with respect to the direction of air flow along the blade body; and wherein at least one of the plurality of blades is characterized in that at least one of the leading edge and the trailing edge is spaced apart from the hub. Claim 3 In claim 2, when the vertex where the leading edge meets the root is called the first point and the vertex where the leading edge meets the tip is called the second point, at least one of the plurality of blades is characterized in that the first point is positioned axially higher than the top of the hub and the second point is positioned axially higher than the first point. Claim 4 An impeller according to claim 3, wherein the shortest length from a virtual horizontal line contacting the uppermost end face in the axial direction of the hub to the second point is 15% or less of the axial length of the hub. Claim 5 An impeller according to claim 2, wherein the vertex where the leading edge meets the root is called the first point, and at least one of the plurality of blades is characterized in that the diameter of the virtual circle connecting the first point with the axis of rotation is smaller than the minimum diameter of the hub. Claim 6 In claim 2, when the vertex where the trailing edge meets the root is called the third point and the vertex where the trailing edge meets the tip is called the fourth point, at least one of the plurality of blades is characterized in that the diameter of the virtual circle connecting the third point with the axis of rotation of the hub is larger than the maximum diameter of the hub. Claim 7 An impeller according to claim 6, characterized in that the shortest length from a virtual vertical line contacting the outer surface of the maximum radius of the hub to the fourth point is 15% or less of the axial length of the hub. Claim 8 In claim 2, the blade body is characterized in that the leading edge is formed perpendicular to or inclined with respect to the axis of rotation. Claim 9 An impeller according to claim 2, characterized in that the blade body is arranged such that the leading edge forms an angle of 50 degrees or more and 90 degrees or less with respect to the axis of rotation. Claim 10 In claim 2, the blade body is characterized in that the trailing edge is formed parallel to or inclined with respect to the axis of rotation. Claim 11 An impeller according to claim 2, characterized in that the blade body is arranged such that the trailing edge forms an angle of 0 degrees or more and 60 degrees or less with respect to the axis of rotation. Claim 12 The impeller according to claim 1, wherein the hub comprises: a coupling portion fixed to a rotating shaft; and a hub body disposed to surround the coupling portion and having a plurality of blades, wherein the coupling portion has an axial length shorter than the axial length of the hub body. Claim 13 In claim 12, the impeller is characterized in that the coupling portion has one end formed a step with one end of the hub body and the other end formed a step with the other end of the hub body. Claim 14 An impeller comprising: a hub installed on a rotating shaft; and a plurality of blades installed on one surface of the hub extending from an inner side adjacent to the rotating shaft to an outer side; wherein at least one of the plurality of blades has an extension portion disposed on the outer side of the hub, wherein at least one end of one side and the other end extends in the forward or reverse direction of the airflow based on the direction of airflow flowing along the blade. Claim 15 In claim 14, when the inner end adjacent to the hub of the blade is called the root and the outer end is called the tip, the blade is characterized in that the root of the extension is spaced apart from the hub. Claim 16 An impeller comprising: a hub installed on a rotating shaft; and a plurality of blades installed on one surface of the hub extending from an inner side adjacent to the rotating shaft to an outer side; wherein the blades comprise: a blade body; a leading edge located at an upstream end of the blade body based on the direction of air flow along the blade body; and a trailing edge located at an downstream end of the blade body based on the direction of air flow along the blade body; and wherein at least one of the plurality of blades is characterized in that at least one of the leading edge and the trailing edge is spaced apart from the hub.