fan

Abstract

In the fan of the present application, a radially outer region of a shroud has a curved shape concave toward an axially upper side, a top surface of the radially outer region of the shroud includes a clip groove formed concave toward an axially lower side. The clip can include a first portion, a second portion opposite to the first portion, a third portion connecting the first portion and the second portion, and an inclined portion cut off from the first portion and bent toward the second portion, an end of the inclined portion being in contact with the clip groove.

Description

Technical Field

[0001] The present invention relates to a clip-on fan capable of reducing vibrations generated when the fan rotates. Background Technology

[0002] Fans are typically used as a means of compressing air through rotational force and are widely used in refrigerators, air conditioners, vacuum cleaners, and other appliances.

[0003] In particular, fans are classified into axial flow fans, multi-blade fans, and turbo fans based on the method of air intake and exhaust or their shape.

[0004] The turbo fan operates as follows: air flows in from the axial direction of the fan and is radially discharged between the blades, i.e., through the side of the fan. Since the air flows naturally into the fan and is discharged to the outside, no duct is required, and it can be used in relatively large-capacity AHUs (Air Handling Units).

[0005] In existing technology, a fan includes a shroud, a hub, and multiple blades arranged between the shroud and the hub and separated in a circumferential direction. In this case, the shroud, hub, and multiple blades are each formed of metal materials and joined together by welding or other methods. Welding metal components leads to increased defect rates, increased weight, and increased material costs.

[0006] In addition, due to product tolerances or errors during welding, there is a problem of vibration when the fan rotates. Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] The purpose of this invention is to provide a fan that can reduce the vibration caused by product tolerances or welding errors during fan rotation.

[0009] The purpose of this invention is to provide a fan that can prevent the clips from detaching from the fan under the centrifugal force generated when the fan is rotating.

[0010] The purpose of this invention is to provide a fan that can improve space efficiency.

[0011] The purpose of this invention is to provide a fan that is easy to manufacture using the mold required for injection molding.

[0012] The object of the present invention is to provide a fan that is easy to maintain and repair by making the clips easily detach from the fan.

[0013] Technical solutions to the problem

[0014] To achieve the above-mentioned objectives, one aspect of the present invention includes a fan comprising: a hub; a shroud opposite to the hub; a plurality of blades arranged between the hub and the shroud and spaced apart in a circumferential direction; and a clip engaged in a radially outer region of the shroud.

[0015] In this case, the radially outer region of the shield may have a curved shape that is concave upward in the axial direction, and the top surface of the radially outer region of the shield may include a clamp groove formed by a concave downward in the axial direction. The clamp may include: a first part; a second part opposite to the first part; a third part connecting the first part and the second part; and an inclined part that is cut off from the first part and bent toward the second part, the end of the inclined part contacting the clamp groove.

[0016] This reduces the vibration caused by product tolerances or welding errors when the fan rotates.

[0017] In addition, it can prevent the clip from detaching from the fan due to the centrifugal force generated when the fan is rotating.

[0018] In addition, the inclined portion may include two inclined portions formed on both sides of the first portion in the horizontal direction.

[0019] In this case, the inclined portion may include: a first inclined portion connected to the first portion and bent to form an obtuse angle with the first portion; and a second inclined portion connected to the first inclined portion and bent to form an obtuse angle with the first inclined portion.

[0020] This improves space efficiency.

[0021] Additionally, the clip groove may include: a first inclined surface extending axially downward from the top surface of the radially outer region of the shield; a second inclined surface extending radially outward from the top surface of the radially outer region of the shield; and a third inclined surface connecting the first inclined surface and the second inclined surface; the end of the second inclined portion of the clip may contact the first inclined surface.

[0022] In addition, the angle formed by the first inclined surface and the third inclined surface can be an obtuse angle, and the angle formed by the second inclined surface and the third inclined surface can also be an obtuse angle.

[0023] In addition, the second inclined portion of the clamp can be separated from the second inclined surface and the third inclined surface, and is opposite to the second inclined surface and the third inclined surface.

[0024] This makes it easy to manufacture the molds needed for the injection molding of fans.

[0025] Additionally, the clip may include a bent portion that bends upward axially from the end of the first portion, and the area connecting the bent portion and the first portion may contact the top surface of the radially outer region of the shield.

[0026] This allows the clips to be easily detached from the fan, making fan maintenance and repair easier.

[0027] To achieve the above-mentioned objectives, one aspect of the present invention includes a fan comprising: a hub; a shroud opposite to the hub; a plurality of blades arranged between the hub and the shroud and spaced apart in a circumferential direction; and a clip engaged in a radially outer region of the hub.

[0028] In this case, the radially outer region of the hub may have a curved shape that is concave downward in the axial direction, and the bottom surface of the radially outer region of the hub may include a clamp groove formed by concave upward in the axial direction. The clamp may include: a first part; a second part opposite to the first part; a third part connecting the first part and the second part; and an inclined part that is cut off from the first part and bent toward the second part, the end of the inclined part contacting the clamp groove.

[0029] This reduces the vibration caused by product tolerances or welding errors when the fan rotates.

[0030] In addition, it can prevent the clip from detaching from the fan due to the centrifugal force generated when the fan is rotating.

[0031] In addition, the inclined portion may include two inclined portions formed on both sides of the first portion in the horizontal direction.

[0032] In this case, the inclined portion may include: a first inclined portion connected to the first portion and bent to form an obtuse angle with the first portion; and a second inclined portion connected to the first inclined portion and bent to form an obtuse angle with the first inclined portion.

[0033] This improves space efficiency.

[0034] Additionally, the clip groove may include: a fourth inclined surface extending axially upward from the bottom surface of the radially outer region of the hub; a fifth inclined surface extending radially outward from the bottom surface of the radially outer region of the hub; and a sixth inclined surface connecting the fourth inclined surface and the fifth inclined surface; the end of the second inclined portion of the clip may contact the fourth inclined surface.

[0035] In addition, the angle formed by the fourth inclined surface and the sixth inclined surface can be an obtuse angle, and the angle formed by the fifth inclined surface and the sixth inclined surface can also be an obtuse angle.

[0036] In addition, the second inclined portion of the clamp can be separated from the fifth inclined surface and the sixth inclined surface, and is opposite to the fifth inclined surface and the sixth inclined surface.

[0037] This makes it easy to manufacture the molds needed for the injection molding of fans.

[0038] Additionally, the clip may include a bent portion that bends downward axially from the end of the first portion, and the area connecting the bent portion and the first portion may contact the bottom surface of the radially outer region of the shield.

[0039] This allows the clips to be easily detached from the fan, making fan maintenance and repair easier.

[0040] To achieve the above-mentioned objectives, one aspect of the present invention includes a fan comprising: a hub; a shroud opposite to the hub; a plurality of blades arranged between the hub and the shroud and spaced apart in a circumferential direction; and a clip engaged in a radially outer region of the shroud.

[0041] In this case, the radially outer region of the shield may have a curved shape that is concave towards the axially upward side. The top surface of the radially outer region of the shield may include a first clip protrusion and a second clip protrusion that are convex towards the axially upward side and separated from each other. The clip may include: a first portion that contacts the second clip protrusion; a second portion that is opposite to the first portion; a third portion that connects the first portion and the second portion; and an inclined portion that is cut off from the first portion and bent towards the second portion, the end of the inclined portion contacting the first clip protrusion.

[0042] Additionally, the first clip protrusion may include: a first region extending axially upward from the top surface of the radially outer region of the cover; and a second region forming a predetermined angle with the first region, wherein the inclined portion may engage with the first region, and the region connecting the first portion and the third portion may contact the second region.

[0043] This reduces the vibration caused by product tolerances or welding errors when the fan rotates.

[0044] In addition, it can prevent the clip from detaching from the fan due to the centrifugal force generated when the fan is rotating.

[0045] Additionally, the inclined portion may include: a first inclined portion connected to the first portion and bent to form an obtuse angle with the first portion; and a second inclined portion connected to the first inclined portion and bent to form an obtuse angle with the first inclined portion. The first inclined portion may be opposite to the top surface of the radially outer region of the protective cover, and the end of the second inclined portion may be engaged in the first region.

[0046] Additionally, the second clip protrusion may include: a third region extending axially upward from the top surface of the radially outer region of the shield; a fourth region extending radially inward from the top surface of the radially outer region of the shield; and a fifth region connecting the third region and the fourth region; the region of the first portion of the clip away from the third portion may contact the fifth region.

[0047] This makes it easy to manufacture the molds needed for the injection molding of fans.

[0048] To achieve the above-mentioned objectives, one aspect of the present invention includes a fan comprising: a hub; a shroud opposite to the hub; a plurality of blades arranged between the hub and the shroud and spaced apart in a circumferential direction; and a clip engaged in a radially outer region of the hub.

[0049] In this case, the radially outer region of the hub may have a curved shape that is concave downwards in the axial direction. The bottom surface of the radially outer region of the hub may include a third clip protrusion and a fourth clip protrusion that are convex downwards in the axial direction and separated from each other. The clip may include: a first portion that contacts the fourth clip protrusion; a second portion that is opposite to the first portion; a third portion that connects the first portion and the second portion; and an inclined portion that is cut off from the first portion and bent toward the second portion, the end of the inclined portion contacting the third clip protrusion.

[0050] Additionally, the third clip protrusion may include: a sixth region extending axially downward from the bottom surface of the radially outer region of the hub; and a seventh region forming a predetermined angle with the sixth region; the inclined portion may engage with the sixth region, and the region connecting the first portion and the third portion may contact the seventh region.

[0051] This reduces the vibration caused by product tolerances or welding errors when the fan rotates.

[0052] In addition, it can prevent the clip from detaching from the fan due to the centrifugal force generated when the fan is rotating.

[0053] Furthermore, this makes it easy to manufacture the molds needed for the injection molding of fans.

[0054] Invention Effects

[0055] This invention provides a fan that can reduce vibrations caused by product tolerances or welding errors during fan rotation.

[0056] In addition, the present invention can provide a fan that prevents the clips from detaching from the fan under the centrifugal force generated when the fan is rotating.

[0057] In addition, this invention can provide a fan that improves space efficiency.

[0058] In addition, this invention provides a fan for which the mold required for injection molding can be easily manufactured.

[0059] In addition, this invention enables the creation of a fan that is easy to maintain and repair, as it allows the clips to be easily detached from the fan. Attached Figure Description

[0060] Figure 1 This is a perspective view of a fan according to an embodiment of the present invention.

[0061] Figure 2 yes Figure 1 An enlarged view of part A.

[0062] Figure 3 yes Figure 2 A sectional view.

[0063] Figure 4 From Figure 3 Image showing the removal of clips.

[0064] Figure 5 This is a perspective view of a clip according to an embodiment of the present invention.

[0065] Figure 6 This is a side view of a clip according to an embodiment of the present invention.

[0066] Figure 7 This is a cross-sectional view of the hub of a fan according to an embodiment of the present invention.

[0067] Figure 8 This is a cross-sectional view of the fan cover and clip according to another embodiment of the present invention.

[0068] Figure 9 This is a cross-sectional view of the fan shroud according to another embodiment of the present invention.

[0069] Figure 10 This is a cross-sectional view of the hub of a fan according to another embodiment of the present invention. Detailed Implementation

[0070] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, unless otherwise specified in the reference numerals, the same or similar constituent elements will be assigned the same reference numerals, and repeated descriptions thereof will be omitted.

[0071] When describing the embodiments disclosed in this invention, when referring to a constituent element as being "connected" or "linked" to other constituent elements, it should be understood that it can be either a direct connection or a connection to the other constituent element, or that there are other constituent elements in between.

[0072] Furthermore, when describing the embodiments disclosed in this invention, detailed descriptions of related well-known technologies are omitted if they are deemed to obscure the essence of the embodiments disclosed in this invention. Additionally, the accompanying drawings are merely for the purpose of facilitating the understanding of the embodiments disclosed in this invention and should not be construed as limiting the invention. Rather, they should be understood to include all modifications, equivalents, and even substitutions within the scope of the ideas and techniques of this invention.

[0073] Figure 1 This is a perspective view of a fan according to an embodiment of the present invention. Figure 2 yes Figure 1 An enlarged view of part A. Figure 3 yes Figure 2 A sectional view. Figure 4 From Figure 3 Image showing the removal of clips. Figure 5 This is a perspective view of a clip according to an embodiment of the present invention. Figure 6 This is a side view of a clip according to an embodiment of the present invention. Figure 7 This is a cross-sectional view of the hub of a fan according to an embodiment of the present invention.

[0074] Reference Figures 1 to 7 The fan 10 of one embodiment of the present invention may include a cover 100, a hub 200, blades 300 and clips 400, but may exclude some of these components, and may also include additional components.

[0075] Fan 10 can be a large fan used in high-capacity air conditioners (AHUs; Air Handling Units), etc. Fan 10 can rotate in one direction or another with respect to its rotation axis O. When fan 10 rotates, from the top (with...) Figure 1 Air flowing in from above (based on the reference point) can pass between the blades 300, that is, through the side portion of the fan 10 (with... Figure 1 It radiates out in a radial pattern (based on the horizontal direction).

[0076] Fan 10 can be made of high-strength plastic. Fan 10 can be injection molded in one piece. Therefore, unlike fans 10 made of metal, no additional processes such as welding are required, thereby reducing the defect rate and increasing production efficiency. In addition, its light weight makes it easy to transport and reduce costs.

[0077] The shield 100 may be opposite to the hub 200. The shield 100 may be positioned above the hub 200. The shield 100 may be formed as a disc with a central opening. The central portion of the opening of the shield 100 may be defined as an air inlet.

[0078] The radially inner end of the shroud 100 adjacent to the inlet can be arranged such that it is positioned further upward in the axial direction as it becomes radially inner. The radially inner region of the shroud 100 adjacent to the inlet can have a curved shape that is concave upward in the axial direction. The inner end of the radially inner region of the shroud 100 can be positioned higher in the axial direction than the outer end of the radially outer region 120. This allows air to easily flow into the fan 10 from above.

[0079] In this invention, the axial upper side can be defined as... Figure 1 With the reference direction above, the axial lower side can be defined as... Figure 1 The direction below the baseline.

[0080] In this invention, the radially inner region of the shield 100 can be defined as the radially inner periphery of the shield 100, and the radially outer region of the shield 100 can be defined as the radially outer periphery of the shield 100.

[0081] The radially outer region 120 of the shield 100, away from the inlet, may have a curved shape that is recessed towards the axially upward side. The radially outer region 120 of the shield 100 may be arranged such that it is located further upward towards the axially as it moves radially outward.

[0082] The connecting region 110 of the inner radial region and the outer radial region 120 of the shield 100 can be formed into a flat shape. The connecting region 110 of the shield 100 can extend in the circumferential direction.

[0083] The top surface 122 of the radially outer region 120 of the shield 100 may be opposite to or in contact with the first portion 410 of the clip 400. The top surface 122 of the radially outer region 120 of the shield 100 may include a first clip groove 130 recessed downward in the axial direction. The first clip groove 130 may be formed in the circumferential direction.

[0084] The first clip groove 130 may include a first inclined surface 132 extending axially downward from the top surface 122 of the radially outer region 120 of the cover 100, a second inclined surface 134 extending radially outward from the top surface 122 of the radially outer region 120 of the cover 100, and a third inclined surface 136 connecting the first inclined surface 132 and the second inclined surface 134. The first inclined surface 132 may contact the end 446 of the second inclined portion 444 of the clip 400. The angle formed by the first inclined surface 132 and the third inclined surface 136 may be an obtuse angle. The obtuse angle formed by the first inclined surface 132 and the third inclined surface 136 may be 0° or more and 170° or less. The angle formed by the third inclined surface 136 and the second inclined surface 134 may be an obtuse angle. The angle formed by the first inclined surface 132 and the rotation axis O may be 0° or more and 10° or less. The second inclined surface 134 and the third inclined surface 136 of the first clip groove 130 may be separate from and opposite to the second inclined portion 444 of the clip 400. Therefore, it is easy to make a mold for forming the first clip groove 130 during the injection molding of the fan 10.

[0085] The bottom surface 124 of the radially outer region 120 of the shield 100 may be opposite to or in contact with the second part 420 of the clip 400. The region connecting the top surface 122 and the bottom surface 124 of the radially outer region 120 of the shield 100 may be opposite to or in contact with the third part 430 of the clip 400.

[0086] The hub 200 may be opposite to the shield 100. The hub 200 may be positioned below the shield 100. The hub 200 may be formed as a centrally open disc shape. Alternatively, the hub 200 may be formed as a centrally closed disc shape.

[0087] The radially outer region 220 of the hub 200 may have a curved shape that is concave downward in the axial direction. The radially outer region 220 of the hub 200 may be arranged such that it is located further downward in the axial direction as it moves radially outward.

[0088] The connecting region 210 between the radially inner region and the radially outer region 220 of the hub 200 can be formed into a flat shape. The connecting region 210 of the hub 200 can extend in the circumferential direction.

[0089] The bottom surface 222 of the radially outer region 220 of the hub 200 may be opposite to or in contact with the first portion 410 of the clip 400. The bottom surface 222 of the radially outer region 220 of the hub 200 may include a second clip groove 230 recessed upward in the axial direction. The second clip groove 230 may extend in the circumferential direction.

[0090] The second clamp groove 230 may include a fourth inclined surface 232 extending axially upward from the bottom surface 222 of the radially outer region 220 of the hub 200, a fifth inclined surface 234 extending radially outward from the bottom surface 222 of the radially outer region 220 of the hub 200, and a sixth inclined surface 238 connecting the fourth inclined surface 232 and the fifth inclined surface 234. The fourth inclined surface 232 may contact the end 446 of the second inclined portion 444 of the clamp 400. The angle formed by the fourth inclined surface 232 and the sixth inclined surface 236 may be an obtuse angle. The obtuse angle formed by the fourth inclined surface 232 and the sixth inclined surface 236 may be 0° or more and less than 170°. The angle formed by the fifth inclined surface 234 and the sixth inclined surface 236 may be an obtuse angle. The angle formed by the fourth inclined surface 232 and the rotation axis O may be 0° or more and less than 10°. The fifth inclined surface 234 and the sixth inclined surface 236 of the second clip groove 230 can be separated from and opposite to the second inclined portion 444 of the clip 400. Therefore, it is easy to manufacture the mold forming the second clip groove 230 during the injection molding of the fan 10.

[0091] The top surface 224 of the radially outer region 220 of the hub 200 may be opposite to or in contact with the second part 420 of the clamp 400. The region connecting the top surface 224 and the bottom surface 222 of the radially outer region 220 of the hub 200 may be opposite to or in contact with the third part 430 of the clamp 400.

[0092] The blades 300 can be arranged between the shield 100 and the hub 200. The blades 300 can contact the bottom surface of the shield 100 and the top surface of the hub 200. The blades 300 can include a plurality of blades 300 separated in a circumferential direction. In one embodiment of the present invention, five blades 300 are used as an example, but the invention is not limited thereto, and the number of blades 300 can be varied.

[0093] The clip 400 can be attached to the radially outer region 120 of the shield 100 and / or the radially outer region 220 of the hub 200. This reduces vibrations that occur when the fan 10 rotates due to tolerances introduced during its manufacturing.

[0094] The clip 400 may include a first portion 410, a second portion 420 opposite to the first portion 410, a third portion 430 connecting the first portion 410 and the second portion 420, and an inclined portion 440 that is cut off from the first portion 410 and bent toward the second portion 420 so that its end contacts the first clip groove 130 or the second clip groove 230. This prevents the clip 400 from detaching from the fan 10 under centrifugal force when the fan 10 rotates.

[0095] The inclined portion 440 may include two inclined portions 440 formed on both sides of the first portion 410 in the horizontal direction or on both sides of the first portion 410 in the circumferential direction. The inclined portion 440 may include a first inclined portion 442 connected to the first portion 410 and bent at an obtuse angle relative to the first portion 410, and a second inclined portion 444 connected to the first inclined portion 442 and bent at an obtuse angle relative to the first inclined portion 442. The obtuse angle between the first portion 410 and the first inclined portion 442 may be 90° and more than 170°. The obtuse angle between the first inclined portion 442 and the second inclined portion 444 may be 90° and more than 170°. The end 446 of the second inclined portion 444 may contact the first inclined surface 132 of the first clip groove 130 and / or the fourth inclined surface 232 of the second clip groove 230. The second inclined portion 444 of the clip 400 may be separate from and opposite to the second inclined surface 134 and the third inclined surface 136 of the first clip groove 130. The second inclined portion 444 of the clip 400 can be separated from and opposite the fifth inclined surface 234 and the sixth inclined surface 236 of the second clip groove 230. This improves space efficiency.

[0096] The clip 400 may include a bent portion 450 that bends axially upward at the end of the first portion 410. The bent portion 450 does not contact the top surface 122 of the radially outer region 120 of the cover 100, but the area connecting the bent portion 450 and the first portion 410 may contact the top surface 122 of the radially outer region 120 of the cover 100. The bent portion 450 does not contact the bottom surface 222 of the radially outer region 220 of the hub 200, but the area connecting the bent portion 450 and the first portion 410 may contact the bottom surface 222 of the radially outer region 220 of the hub 200. Therefore, the clip 400 can be easily separated from the fan 10, thus facilitating the maintenance of the fan 10.

[0097] In one embodiment of the fan 10 of the present invention, the clip 400 can be attached to at least one of the radially outer region 120 of the shield 100 and the radially outer region 220 of the hub 200. This allows for adjustment of the overall balance of the fan 10, thereby reducing noise generated when the fan 10 rotates. Furthermore, it prevents the clip 400 from disengaging when the fan 10 rotates.

[0098] Figure 8 This is a cross-sectional view of the fan cover and clip according to another embodiment of the present invention. Figure 9 This is a cross-sectional view of the fan shroud according to another embodiment of the present invention. Figure 10 This is a cross-sectional view of the hub of a fan according to another embodiment of the present invention.

[0099] Reference Figures 8 to 10In another embodiment of the present invention, the fan 10 may include a cover 100, a hub 200, blades 300 and clips 400, but may exclude some of these components, and may also include additional components.

[0100] Except for the shape of the top surface 122 of the radially outer region 120 of the fan 10 of another embodiment of the present invention and the shape of the bottom surface 222 of the radially outer region 220 of the hub 200, it can be understood that the specific configuration is the same as that of the fan 10 of one embodiment of the present invention.

[0101] The top surface 122 of the radially outer region 120 of the shield 100 may include a first clip protrusion 140 and a second clip protrusion 150 that are axially upward and separated from each other. The distance between the first clip protrusion 140 and the second clip protrusion 150 may be from 5 mm to 30 mm.

[0102] The first portion 410 of the clip 400 can contact the second clip protrusion 150, and the end 446 of the inclined portion 440 can contact the first clip protrusion 140. That is, the first portion 410 of the clip 400 contacts the second clip protrusion 150, and the end 446 of the inclined portion 440 of the clip 400 engages with the first clip protrusion 140, thereby maintaining the engagement between the clip 400 and the radially outer region 120 of the cover 100.

[0103] The first clip protrusion 140 may include a first region 142 extending axially upward from the top surface 122 of the radially outer region 120 of the cover 100, and a second region 144 forming a predetermined angle with the first region 142. The second region 144 may be connected to the curved surface region 123 connecting the top surface 122 and the bottom surface 124 of the radially outer region 120 of the cover 100.

[0104] In this case, the first inclined portion 442 of the clip 400 is opposite to the top surface 122 of the radially outer region 120 of the cover 100, the inclined portion 440 of the clip 400 is engaged in the first region 142, and the region connecting the first part 410 and the third part 430 of the clip 400 can contact the second region 144.

[0105] The second clip protrusion 150 may include a third region 152 extending axially upward from the top surface 122 of the radially outer region 120 of the cover 100, a fourth region 154 extending radially inward from the top surface 122 of the radially outer region 120 of the cover 100, and a fifth region 156 connecting the third region 152 and the fourth region 154. The angle formed by the third region 152 and the rotation axis O can be greater than 0° and less than 30°. In this case, the region of the first portion 410 of the clip 400 away from the third portion 430 can contact the fifth region 156. Therefore, it is easy to manufacture the mold during the injection molding of the fan 10.

[0106] The bottom surface 222 of the radially outer region 220 of the hub 200 may include a third clip protrusion 240 and a fourth clip protrusion 250 that protrude axially downward and are separated from each other. The distance between the third clip protrusion 240 and the fourth clip protrusion 250 may be from 5 mm to 30 mm.

[0107] The first portion 410 of the clip 400 can contact the fourth clip protrusion 250, and the end 446 of the inclined portion 440 can contact the third clip protrusion 240. That is, the first portion 410 of the clip 400 contacts the fourth clip protrusion 250, and the end 446 of the inclined portion 440 of the clip 400 engages with the third clip protrusion 240, thereby maintaining the engagement between the clip 400 and the radially outer region 220 of the hub 200.

[0108] The third clip protrusion 240 may include a sixth region 242 extending axially downward from the bottom surface 222 of the radially outer region 220 of the hub 200, and a seventh region 244 forming a predetermined angle with the sixth region 242. The seventh region 244 may be connected to the curved surface region 223 connecting the bottom surface 222 and the top surface 224 of the radially outer region 220 of the hub 200.

[0109] In this case, the first inclined portion 442 of the clip 400 is opposite to the bottom surface 222 of the radially outer region 220 of the hub 200, the inclined portion 440 of the clip 400 is engaged in the sixth region 242, and the region connecting the first part 410 and the third part 430 of the clip 400 can contact the seventh region 244.

[0110] The fourth clip protrusion 250 may include an eighth region 252 extending axially downward from the bottom surface 222 of the radially outer region 220 of the hub 200, a ninth region 254 extending radially inward from the bottom surface 222 of the radially outer region 220 of the hub 200, and a tenth region 256 connecting the eighth region 252 and the ninth region 254. The angle formed by the eighth region 252 and the rotation axis O can be greater than 0° and less than 30°. In this case, the region of the first portion 410 of the clip 400 that is away from the third portion 430 can contact the tenth region 256. Therefore, it is easy to manufacture the mold during the injection molding of the fan 10.

[0111] According to another embodiment of the present invention, the fan 10 can increase the clamping force between the top surface 122 of the radially outer region 120 of the shield 100 and the clamp 400 by means of the second clamp protrusion 150, and can prevent the clamp 400 from disengaging from the shield 100 when the fan 10 rotates by means of the first clamp protrusion 140.

[0112] In addition, the fourth clip protrusion 250 can increase the clamping force between the bottom surface 222 of the radially outer region 220 of the hub 200 and the clip 400, and the third clip protrusion 240 can prevent the clip 400 from disengaging from the hub 200 when the fan 10 rotates.

[0113] The embodiments of the present invention described above, or other embodiments thereof, are not mutually exclusive or distinct. The respective configurations or functions of the embodiments of the present invention described above, or other embodiments thereof, can be used together or combined.

[0114] For example, this means that configuration A illustrated in a particular embodiment and / or the accompanying drawings can be combined with configuration B illustrated in other embodiments and / or the accompanying drawings. That is, even if the combination between configurations is not directly described, it means that combination is possible except where it is explicitly stated that combination is not possible.

[0115] The detailed description above should not be construed as limiting in all respects, but should be considered illustrative. The scope of the invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the invention are included within the scope of the invention.

Claims

1. A fan, wherein, include: Wheel hub; The protective cover is opposite to the wheel hub; A plurality of blades are arranged between the hub and the shield, and are separated in a circumferential direction; as well as Clips are attached to the radially outer region of the shield; The radially outer region of the shield has a curved shape that is concave upwards towards the axial direction. The top surface of the radially outer region of the shield includes a clamp groove recessed towards the axially downward side. The clip includes: a first portion; a second portion opposite to the first portion; a third portion connecting the first portion and the second portion; and an inclined portion cut off from the first portion and bent toward the second portion, the end of the inclined portion contacting the clip groove.

2. The fan according to claim 1, wherein, The inclined portion includes two inclined portions formed on both sides of the first portion in the horizontal direction.

3. The fan according to claim 1, wherein, The inclined portion includes: a first inclined portion connected to the first portion and bent to form an obtuse angle with the first portion; and a second inclined portion connected to the first inclined portion and bent to form an obtuse angle with the first inclined portion.

4. The fan according to claim 3, wherein, The clip groove includes: a first inclined surface extending axially downward from the top surface of the radially outer region of the shield; a second inclined surface extending radially outward from the top surface of the radially outer region of the shield; and a third inclined surface connecting the first inclined surface and the second inclined surface. The end of the second inclined portion of the clamp contacts the first inclined surface.

5. The fan according to claim 4, wherein, The angle formed by the first inclined surface and the third inclined surface is an obtuse angle, and the angle formed by the second inclined surface and the third inclined surface is also an obtuse angle.

6. The fan according to claim 4, wherein, The second inclined portion of the clamp is separate from the second inclined surface and the third inclined surface, and is opposite to the second inclined surface and the third inclined surface.

7. The fan according to claim 1, wherein, The clip includes a bent portion that bends upward axially from the end of the first portion. The area connecting the bend and the first part contacts the top surface of the radially outer region of the shield.

8. A fan, wherein, include: Wheel hub; The protective cover is opposite to the wheel hub; A plurality of blades are arranged between the hub and the shield, and are separated in a circumferential direction; as well as A clip is attached to the radially outer region of the hub; The radially outer region of the hub has a curved shape that is concave downwards towards the axial direction. The bottom surface of the radially outer region of the hub includes a clamp groove recessed towards the axially upward side. The clip includes: a first portion; a second portion opposite to the first portion; a third portion connecting the first portion and the second portion; and an inclined portion cut off from the first portion and bent toward the second portion, the end of the inclined portion contacting the clip groove.

9. The fan according to claim 8, wherein, The inclined portion includes two inclined portions formed on both sides of the first portion in the horizontal direction.

10. The fan according to claim 8, wherein, The inclined portion includes: a first inclined portion connected to the first portion and bent to form an obtuse angle with the first portion; and a second inclined portion connected to the first inclined portion and bent to form an obtuse angle with the first inclined portion.

11. The fan according to claim 10, wherein, The clamp groove includes: a fourth inclined surface extending axially upward from the bottom surface of the radially outer region of the hub; a fifth inclined surface extending radially outward from the bottom surface of the radially outer region of the hub; and a sixth inclined surface connecting the fourth inclined surface and the fifth inclined surface. The end of the second inclined portion of the clamp contacts the fourth inclined surface.

12. The fan according to claim 11, wherein, The angle formed by the fourth inclined surface and the sixth inclined surface is an obtuse angle, and the angle formed by the fifth inclined surface and the sixth inclined surface is also an obtuse angle.

13. The fan according to claim 11, wherein, The second inclined portion of the clamp is separate from and opposite to the fifth and sixth inclined surfaces.

14. The fan according to claim 8, wherein, The clip includes a bent portion that bends downwards axially from the end of the first portion. The area connecting the bend and the first part contacts the bottom surface of the radially outer region of the shield.

15. A fan, wherein, include: Wheel hub; The protective cover is opposite to the wheel hub; A plurality of blades are arranged between the hub and the shield, and are separated in a circumferential direction; as well as Clips are attached to the radially outer region of the shield; The radially outer region of the shield has a curved shape that is concave upwards towards the axial direction. The top surface of the radially outer region of the shield includes a first clip protrusion and a second clip protrusion that are axially upward and separated from each other. The clip includes: a first portion that contacts the second clip protrusion; a second portion that is opposite to the first portion; a third portion that connects the first portion and the second portion; and an inclined portion that is cut off from the first portion and bent toward the second portion, the end of the inclined portion contacting the first clip protrusion.

16. The fan according to claim 15, wherein, The first clip protrusion includes: a first region extending axially upward from the top surface of the radially outer region of the shield; and a second region forming a predetermined angle with the first region; The inclined portion is engaged in the first region, and the region connecting the first part and the third part is in contact with the second region.

17. The fan according to claim 16, wherein, The inclined portion includes: a first inclined portion connected to the first portion and bent to form an obtuse angle with the first portion; and a second inclined portion connected to the first inclined portion and bent to form an obtuse angle with the first inclined portion. The first inclined portion is opposite to the top surface of the radially outer region of the shield, and the end of the second inclined portion is engaged in the first region.

18. The fan according to claim 15, wherein, The second clip protrusion includes: a third region extending axially upward from the top surface of the radially outer region of the shield; a fourth region extending radially inward from the top surface of the radially outer region of the shield; and a fifth region connecting the third region and the fourth region. The region of the first part of the clamp that is away from the third part comes into contact with the fifth region.

19. A fan, wherein, include: Wheel hub; The protective cover is opposite to the wheel hub; A plurality of blades are arranged between the hub and the shield, and are separated in a circumferential direction; as well as A clip is attached to the radially outer region of the hub; The radially outer region of the hub has a curved shape that is concave downwards towards the axial direction. The bottom surface of the radially outer region of the hub includes a third clip protrusion and a fourth clip protrusion that project axially downward and are separated from each other. The clip includes: a first portion that contacts the fourth clip protrusion; a second portion that is opposite to the first portion; a third portion that connects the first portion and the second portion; and an inclined portion that is cut off from the first portion and bent toward the second portion, the end of the inclined portion contacting the third clip protrusion.

20. The fan according to claim 19, wherein, The third clip protrusion includes: a sixth region extending axially downward from the bottom surface of the radially outer region of the hub; and a seventh region forming a predetermined angle with the sixth region. The inclined portion is engaged in the sixth region, and the region connecting the first part and the third part is in contact with the seventh region.

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