fan

Abstract

A fan. The fan comprises a center disc, a plurality of connecting parts, and a plurality of fan blades. Each of the plurality of connecting parts has opposite first and second end parts, and the first end part is configured to be detachably connected to the center disc. The plurality of fan blades are respectively configured to be detachably connected to the second end parts of the plurality of connecting parts to be connected to the center disc through the plurality of connecting parts. Each of the plurality of connecting parts presents a twisted state in a direction from the first end part to the second end part. The fan has higher static pressure efficiency and better blowing effect, and its manufacturing process is simple, which is conducive to reducing manufacturing cost.

Description

Technical Field

[0001] Embodiments of this disclosure relate to a fan. Background Technology

[0002] Fans are used in the construction machinery industry, mining equipment, generator sets, and other engines as cooling fans to achieve airflow and cooling. In the fan design process, the structure of the fan blades and their connection structure are key factors affecting the fan's conversion efficiency and airflow effect. Therefore, how to improve the structure of the fan blades and their connection structure is a problem that technicians in this field continuously research. Summary of the Invention

[0003] At least one embodiment of this disclosure provides a fan, the fan including a central disk, a plurality of connecting portions and a plurality of fan blades, wherein each of the plurality of connecting portions has a first end and a second end opposite to each other, the first end being configured to be detachably connected to the central disk; the plurality of fan blades are respectively configured to be detachably connected to the second end of the plurality of connecting portions to be connected to the central disk through the plurality of connecting portions; wherein each of the plurality of connecting portions is in a torsional state in the direction from the first end to the second end.

[0004] For example, in a fan provided by at least one embodiment of this disclosure, each of the plurality of connecting portions further has a torsion portion connected between the first end and the second end, the torsion portion presenting the torsion state, and the first end and the second end presenting a planar state; the plane where the first end is located is a first plane, and the angle between the cross section obtained by cutting the torsion portion in a direction perpendicular to the first plane from the first end to the second end and the first plane gradually increases.

[0005] For example, in the fan provided in at least one embodiment of this disclosure, at least a portion of the outlines of the multiple cross-sections obtained by cutting the torsion portion in a direction perpendicular to the first plane from the first end to the second end are all straight lines.

[0006] For example, in the fan provided in at least one embodiment of this disclosure, at least a portion of the outline of the cross-section obtained by cutting the torsion portion in a direction perpendicular to the first plane in the direction from the first end to the second end is a curve.

[0007] For example, in a fan provided in at least one embodiment of this disclosure, the curve includes a wavy line.

[0008] For example, in a fan provided in at least one embodiment of this disclosure, the curve includes a sine curve.

[0009] For example, in the fan provided in at least one embodiment of this disclosure, the rate at which the included angle increases varies in the direction from the first end to the second end.

[0010] For example, in the fan provided in at least one embodiment of this disclosure, the rate at which the included angle increases in the direction from the first end to the second end gradually increases.

[0011] For example, in a fan provided in at least one embodiment of this disclosure, the width of each of the plurality of connecting portions is smaller than the width of each of the plurality of fan blades.

[0012] For example, in a fan provided in at least one embodiment of this disclosure, each of the plurality of connecting portions includes a first connecting portion and a second connecting portion that are stacked and detachably connected to each other, wherein the portion of the central disk connected to the first end is sandwiched and connected between the first connecting portion and the second connecting portion, and the portions of the plurality of fan blades connected to the second end are respectively sandwiched and connected between the first connecting portion and the second connecting portion.

[0013] For example, in at least one embodiment of the fan provided in this disclosure, the thickness of the first connecting part and the second connecting part are 3mm to 12mm respectively, and the distance between the first connecting part and the second connecting part is 20mm to 60mm.

[0014] For example, in the fan provided in at least one embodiment of this disclosure, along the direction from the first end to the second end, the length of the torsional portion of each of the plurality of connecting portions is 50mm to 230mm, the width of the torsional portion of each of the plurality of connecting portions is 80mm to 300mm, and the torsional angle of the torsional portion of each of the plurality of connecting portions is 10° to 45°.

[0015] For example, in a fan provided in at least one embodiment of this disclosure, the plurality of fan blades have curvature in the same direction and do not have a torsional angle.

[0016] For example, in a fan provided in at least one embodiment of this disclosure, each of the plurality of fan blades includes a root connected to a second end of the plurality of connecting portions and a top opposite the root, wherein the root includes a protrusion adapted to the shape of the second end.

[0017] For example, in a fan provided in at least one embodiment of this disclosure, the raised sidewalls smoothly transition to the fan blades.

[0018] For example, in at least one embodiment of the fan provided in this disclosure, the thickness of the root at the protrusion is 10mm to 40mm.

[0019] For example, in a fan provided in at least one embodiment of this disclosure, the thickness of each of the plurality of fan blades gradually decreases in the direction from the root to the top.

[0020] For example, in a fan provided in at least one embodiment of this disclosure, the central disk includes a first central disk, a second central disk, and a central pad stacked together, wherein the middle portions of the first central disk and the second central disk are spaced apart and connected by the central pad.

[0021] For example, in a fan provided in at least one embodiment of this disclosure, the first center disk includes a plurality of first fixing portions located on the edge of the first center disk, and the second center disk includes a plurality of second fixing portions located on the edge of the second center disk. The plurality of first fixing portions and the plurality of second fixing portions correspond one-to-one and are configured to fix the plurality of connecting portions. The correspondingly provided first fixing portions and second fixing portions are respectively sandwiched and connected between the first connecting portion and the second connecting portion at the first end.

[0022] For example, in a fan provided in at least one embodiment of this disclosure, the central disk further includes a plurality of edge pads, which are respectively sandwiched between the first fixing part and the plurality of second fixing parts.

[0023] For example, in a fan provided in at least one embodiment of this disclosure, the second center disc includes a plurality of protrusions that protrude radially outward from between the plurality of second fixing portions and are located between adjacent connecting portions among the plurality of connecting portions.

[0024] For example, in a fan provided in at least one embodiment of this disclosure, the plurality of protruding portions extend to the roots of the plurality of fan blades and are complementary in shape to the plurality of connecting portions.

[0025] For example, in the fan provided in at least one embodiment of this disclosure, the gap between adjacent protrusions and connecting parts is 5mm to 12mm, and the gap between adjacent protrusions and fan blades is 5mm to 20mm.

[0026] For example, in at least one embodiment of the fan provided in this disclosure, the thickness of the first central disk and the second central disk are 4mm to 12mm respectively; the distance between the first central disk and the second central disk is 10mm to 55mm.

[0027] For example, in a fan provided in at least one embodiment of this disclosure, each of the plurality of fan blades includes a first material layer and a second material layer stacked together. The first material layer includes a plain weave prepreg made of epoxy resin and a first glass fiber composite, and the second material layer includes a chopped prepreg made of epoxy resin and a second glass fiber composite. The length of the first glass fiber is greater than the length of the second glass fiber.

[0028] For example, in the fan provided in at least one embodiment of this disclosure, the material of the plurality of connecting parts includes a metallic material. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this disclosure and are not intended to limit this disclosure.

[0030] Figure 1 A perspective view of a fan provided in at least one embodiment of this disclosure;

[0031] Figure 2 An exploded schematic diagram of a fan provided in at least one embodiment of this disclosure;

[0032] Figures 3A-3K Schematic diagrams of the connection portion of a fan provided in at least one embodiment of this disclosure, viewed from different angles;

[0033] Figures 4A-4C A schematic diagram of the fan blades of a fan provided in at least one embodiment of the present disclosure, viewed from different angles;

[0034] Figure 5 A schematic diagram of the central disk of a fan provided in at least one embodiment of this disclosure;

[0035] Figure 6 An exploded view of the central disk of a fan provided for at least one embodiment of this disclosure;

[0036] Figure 7 This is a schematic diagram showing the connection between the connecting part and the fan blades of a fan provided in at least one embodiment of the present disclosure;

[0037] Figure 8 A schematic diagram showing the connection between the connecting part of the fan and the central disk according to at least one embodiment of this disclosure; and

[0038] Figure 9 A side view of the connection of the fan, fan blades, and center disk provided in at least one embodiment of this disclosure. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0040] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0041] As mentioned above, the structure of the fan blades and the connection structure of the fan blades are key factors affecting the conversion efficiency and blowing effect of the fan. The inventors of this disclosure have found in their research that the existing fan blade structure and the fan blade connection structure are complicated to manufacture, and their shape affects the air output, thus reducing the air output efficiency of the fan, resulting in an unsatisfactory blowing effect and high power consumption.

[0042] At least one embodiment of this disclosure provides a fan, which includes a central disk, a plurality of connecting portions and a plurality of fan blades. Each of the plurality of connecting portions has a first end and a second end opposite to each other. The first end is configured to be detachably connected to the central disk. The plurality of fan blades are respectively configured to be detachably connected to the second ends of the plurality of connecting portions to be connected to the central disk through the plurality of connecting portions. Each of the plurality of connecting portions is in a torsional state in the direction from the first end to the second end.

[0043] The fan provided in at least one embodiment of this disclosure has high static pressure efficiency and better air blowing effect, and its manufacturing process is simple, which helps to reduce manufacturing costs.

[0044] The fan provided in the embodiments of this disclosure will be described below through several specific examples.

[0045] This disclosure provides at least one embodiment of a fan, Figure 1 A three-dimensional schematic diagram of the fan is shown. Figure 2 A schematic diagram of the fan's explosion is shown. (As shown) Figure 1 and Figure 2 As shown, the fan includes a central disk 10, multiple connecting parts 20, and multiple fan blades 30, with the multiple fan blades 30 respectively connected to the central disk 10 through the multiple connecting parts 20.

[0046] For example, Figures 3A-3D The diagram shows the connecting part 20 viewed from different angles, in which... Figure 3D For along Figure 3C A schematic diagram obtained by viewing the connecting portion 20 in the direction indicated by the middle arrow. In some embodiments, such as Figures 3A-3D As shown, each of the plurality of connecting portions 20 has an opposing first end 201 and a second end 202. The first end 201 is configured to be detachably connected (e.g., detachably connected by bolts) to the central disk 10. The plurality of fan blades 30 are respectively configured to be detachably connected (e.g., detachably connected by bolts) to the second ends 202 of the plurality of connecting portions 20, so as to be connected to the central disk 10 via the plurality of connecting portions 20. For example, each of the plurality of connecting portions 20 is in a torsional state in the direction from the first end 201 to the second end 202.

[0047] Therefore, during the manufacturing process of the fan, the angle of the fan blades 30 can be adjusted by selecting connecting parts 20 with different torsion angles, without the need to specially prepare fan blades 30 with different curvatures to adjust the air volume and static pressure. This design can quickly arrange the number of fan blades 30 and adjust the overall diameter of the fan. Furthermore, using connecting parts 20 with torsion angles instead of fan blades can accommodate higher speeds.

[0048] For example, in some embodiments, the connecting portion 20 is made of metal, thus the connecting portion 20 can be integrally formed by stamping, or it can be formed by die casting, molding, or other methods. For example, the metal material used for the connecting portion 20 can be steel plate, cast aluminum, composite materials, or nylon injection molding material with internal metal embedded parts, etc. As a result, the manufacturing process of multiple connecting portions 20 is simpler, and their torsion angle can be easily achieved by adjusting the stamping die, which is beneficial to improving production efficiency and facilitating mass production.

[0049] In the embodiments of this disclosure, the manufacturing process of the multiple connecting parts 20 is simple and facilitates the production of connecting parts 20 with different torsion angles for use with different fans. In contrast, the fan blades 30 are made of composite materials (described in detail later), and their manufacturing process is more complex, making it difficult to form fan blades with different torsion angles, or the manufacturing cost is higher. In the embodiments of this disclosure, by designing the multiple connecting parts 20 to present a torsion state, different sizes of fans can be achieved by selecting the multiple connecting parts 20. At the same time, the setting direction of the fan blades can be adjusted by different torsion states of the connecting parts 20 to apply to different scenarios. Production practice shows that the manufacturing process of this fan is simple, greatly reducing the manufacturing cost, and different products can be achieved by selecting different connecting parts 20, greatly increasing output and improving economic efficiency.

[0050] For example, in some embodiments, such as Figures 3A-3DAs shown, each of the plurality of connecting portions 20 further has a torsion portion 203 connected between the first end 201 and the second end 202. The torsion portion 203 is in a torsional state, while the first end 201 and the second end 202 are in a planar state. The torsion portion is smoothly connected to the first end 201 and the second end 202, realizing relative deflection between the first end 201 and the second end 202. At this time, the torsional state of the connecting portion 202 is realized by the torsion portion 203, and the planar state of the first end 201 and the second end 202 facilitates connection with the fan blade 30 and the center disk 10.

[0051] For example, taking the plane where the first end 201 is located as the first plane, in the direction from the first end 201 to the second end 202, such as Figure 3D As shown, the angle between the cross-section obtained by cutting the twisted portion 203 along a direction perpendicular to the first plane and the first plane gradually increases. That is, as... Figure 3D As shown, the twisted portion 203 is cut along the direction indicated by the solid arrow to obtain a cross section. From the first end 201 to the second end 201, the angle between the obtained multiple cross sections and the first plane gradually increases.

[0052] For example, Figure 3E It shows along Figure 3B Cross-sectional schematic diagrams obtained by cutting the torsion section 203 at multiple locations B, C, and D, as shown in the figure. Figure 3E As shown, in the direction from the first end 201 to the second end 201, that is, in the direction from position B to D, the angle between the obtained multiple cross sections and the first plane gradually increases.

[0053] Alternatively, the plane containing the second end 202 can be used as the first plane, and the direction from the first end 201 to the second end 202 can be as follows: Figure 3D As shown, the angle between the cross-section obtained by cutting the twisted portion 203 along a direction perpendicular to the first plane and the first plane gradually increases. That is, as... Figure 3D As shown, the twisted portion 203 is cut along the direction indicated by the solid arrow to obtain a cross-section. From the first end 201 to the second end 201, the angles between the obtained cross-sections and the first plane gradually increase. For example, in some embodiments, in the direction from the first end 201 to the second end 202, some of the cross-sections obtained by cutting the twisted portion 203 in a direction perpendicular to the first plane have outlines that are all straight lines. In this case, when the cross-section is a regular shape composed of straight lines, such as a rectangle, the angle between the cross-section and the first plane is the angle between the long side of the rectangle's outline, that is, the outline in the width direction of the connecting portion 20, and the first plane.

[0054] For example, in some embodiments, at least a portion of the contour lines of a plurality of cross-sections obtained by cutting the torsion portion 203 in a direction perpendicular to the first plane from the first end 201 to the second end 202 are curved. For example, part of the contour line in the cross-section is straight and part is curved. For example, the contour of a portion of the cross-section has a convex or concave shape, that is, the curve can be a wavy line, such as a sine curve. In this case, the angle between the cross-section and the first plane can be the angle between the tangent plane of the curved contour line in the width direction of the connecting portion 20 and the first plane, or the angle between the straight contour line in the width direction of the connecting portion 20 and the first plane. If all the contour lines in the cross-section contour are curved, the angle between the cross-section and the first plane can be the angle between the tangent plane of the curved contour line in the width direction of the connecting portion 20 and the first plane, for example... Figure 3D The angle between the tangent plane of the curved profile at the end circled by the dashed line and the first plane. For example, the angle between the cross section indicated by the dashed arrow and the first plane is the angle α between the tangent plane T and the first plane. Therefore, it can be seen that in Figure 3D In the process, the angle between the multiple cross sections obtained by cutting the twisted portion 203 in a direction perpendicular to the first plane from the first end 201 to the second end 202 and the first plane gradually increases.

[0055] For example, Figures 3F-3J They are shown respectively Figure 3B A schematic cross-sectional view of the torsion portion 203 at position AE. For example, as shown... Figure 3F As shown, the cross-section of the torsion portion 203 at position A (e.g., the end of the torsion portion 203 near the first end 201) is rectangular, and the angle between this cross-section and the first plane is the angle between the line A1 and the first plane. Figure 3G As shown, the profile of the cross-section of the torsion section 203 at position B is partly straight (the left and right sides) and partly curved (the upper and lower sides). This curve is, for example, a flat wavy line, or in some examples, a flat sine curve. In this case, the angle between the cross-section and the first plane is the angle between the end of curve B1 (e.g., the left end) and the first plane. Figure 3H As shown, the cross-section of the torsion portion 203 at position C (e.g., the middle part of the torsion portion 203) is rectangular. In this case, the angle between this cross-section and the first plane is the angle between the line C1 and the first plane. Figure 3I As shown, the profile of the cross-section of the torsion section 203 at position D is partially straight (left and right sides) and partially curved (upper and lower sides). This curve is, for example, a flat wavy line, or in some examples, a flat sine curve. In this case, the angle between the cross-section and the first plane is the angle between the end of curve D1 (e.g., the left end) and the first plane. Figure 3JAs shown, the cross-section of the torsion part 203 at position E (for example, the end of the torsion part 203 near the second end 202) is rectangular, and the angle between this cross-section and the first plane is the angle between the straight line E1 and the first plane.

[0056] For example, Figure 3K It shows Figure 3I An enlarged diagram of the area indicated by the dashed line, as shown below. Figure 3K As shown, the curved profile of this section is wavy, for example, basically a sine curve.

[0057] In the embodiments of this disclosure, by designing the torsion part 203 as described above, the torsion part 203 can not only be used to adjust the orientation of the fan blade 30, thereby adjusting the overall airflow and static pressure of the fan, but also has high strength, playing a more stable connection role, and can also achieve the effect of guiding airflow, improving the overall blowing effect of the fan.

[0058] For example, in some embodiments, the rate of increase of the angle between the multiple cross sections obtained by cutting the twisted portion 203 in a direction perpendicular to the first plane from the first end 201 to the second end 202 and the first plane varies. For example, in some examples, the rate of increase of the angle gradually increases. That is, among the multiple cross sections obtained by cutting the twisted portion 203 at the same interval in the direction from the first end 201 to the second end 202, the difference in the angle between two adjacent cross sections near the first end 201 and the first plane is smaller than the difference in the angle between two adjacent cross sections near the second end 202 and the first plane.

[0059] The connecting part 20 with the above design is beneficial to the arrangement of the fan blades 30 and to improving the blowing effect and air output efficiency of the fan.

[0060] For example, in some embodiments, the surface of the torsion portion 203 of the plurality of connecting portions 20 may be smooth, or it may be a structure with reinforcing ribs or guide fins, or other structures that are beneficial to increasing strength and improving the airflow guidance effect near the connecting portion 20. The embodiments of this disclosure do not limit the specific form of the torsion portion 203.

[0061] For example, in some embodiments, such as Figure 1 As shown, the width W2 of each of the plurality of connecting parts 20 is smaller than the width W1 of each of the plurality of fan blades 30.

[0062] For example, in some embodiments, such as Figures 3A-3DAs shown, each of the plurality of connecting portions 20 includes a first connecting portion 20A and a second connecting portion 20B that are stacked and detachably connected to each other (e.g., detachably connected by bolts). During installation, the portion of the central disk 10 connected to the first end 201 is sandwiched and connected between the first connecting portion 20A and the second connecting portion 20B, and the portions of the plurality of fan blades 30 connected to the second end 202 are respectively sandwiched and connected between the first connecting portion 20A and the second connecting portion 20B, as shown. Figure 1 and Figure 7 , Figure 8 As shown. This design helps improve the connection stability of the central disk 10, the connecting part 20, and the fan blade 30.

[0063] For example, in some embodiments, the thickness of the first connecting portion 20A and the second connecting portion 20B can be 3mm to 12mm, such as 4mm, 6mm, 8mm or 10mm, and the distance D1 between the first connecting portion 20A and the second connecting portion 20B can be 20mm to 60mm, such as 30mm, 40mm or 50mm.

[0064] For example, in some embodiments, such as Figure 3B As shown, along the direction from the first end 201 to the second end 202, the length D2 of the torsion portion 203 of each of the plurality of connecting portions 20 can be 50mm to 230mm, for example, 60mm, 80mm, 100mm, 120mm, 150mm, 180mm, or 200mm, etc. Figure 3B As shown, in the direction perpendicular to the distance from the first end 201 to the second end 202, the width W2 of the torsion portion 203 of each of the plurality of connecting portions 20 can be 80mm to 300mm, for example, 100mm, 120mm, 150mm, 200mm, 250mm, or 280mm. For example, the torsion angle of the torsion portion 203 of each of the plurality of connecting portions 20 can be 10° to 45°, for example, 15°, 25°, 30°, 32°, or 35°.

[0065] For example, the torsion angle of each torsion part 203 is equal to the angle between the plane where the first end 201 is located and the plane where the second end 202 is located. This torsion angle can be selected according to actual needs. Through the above design, the connecting part 20 can be adapted to fans of different sizes, adjust the orientation of the fan blades 30 to different degrees, and be applied to different scenarios.

[0066] For example, Figures 4A-4C A schematic diagram of the fan blade 30 viewed from different angles is shown, such as... Figures 4A-4C As shown, the multiple fan blades 30 have curvature in the same direction and no torsional angle.

[0067] For example, such as Figures 4A-4C As shown, each of the plurality of fan blades 30 includes a root 301 connected to a second end 202 of the plurality of connecting portions 20 and a top 302 opposite to the root 301. In embodiments of this disclosure, "the plurality of fan blades 30 have curvature in the same direction and have no torsional angle" means that, as Figure 4A As shown, multiple cross-sections of the fan blade 30 are obtained in the direction indicated by the arrows, from the root 301 to the top 302. The outlines of these multiple cross-sections are generally curved, and the centers of curvature of these curves are located on the same side of the curve. Fan blades 30 without a torsion angle are easier to manufacture, which can save manufacturing costs and improve manufacturing efficiency.

[0068] For example, in some examples, multiple fan blades 30 have the same structure and shape, which helps to further simplify the manufacturing process of the fan blades 30.

[0069] For example, in some embodiments, each of the plurality of fan blades 30 includes a laminated first material layer and a second material layer. The first material layer includes a plain weave prepreg composed of epoxy resin and first glass fiber, and the second material layer includes a chopped prepreg composed of epoxy resin and second glass fiber. The length of the first glass fiber is greater than the length of the second glass fiber. During manufacturing, this laminated material more easily forms fan blades 30 with curvature in the same direction and without a torsional angle.

[0070] For example, in the manufacturing process of the fan blade 30, a first material layer is first formed, and then a second material layer is laid on the first material layer. The first material layer includes a plain weave prepreg composed of epoxy resin and first glass fiber. This material serves as the base material, and its first glass fiber is relatively long, being a long glass fiber. The long glass fibers are alternately laid in the first material layer to form a mesh, which is beneficial for forming a stable base material. The second material layer includes a chopped prepreg composed of epoxy resin and second glass fiber. Its second glass fiber is relatively short, being a short glass fiber, which is beneficial for forming an isotropic laminated material, which is beneficial for improving the uniformity of the fan blade 30, increasing the tensile strength and fatigue resistance of the fan blade.

[0071] Verification shows that the fan blade 30 made of the above-mentioned composite material has advantages such as high mechanical properties and resistance to chemical corrosion such as alkali, acid and salt. Furthermore, the material layers with alternating long glass fibers make the fan blade stronger in tensile strength and better in fatigue resistance. In addition, the fan blade 30 made of the above-mentioned composite material is lighter than traditional steel and aluminum fan blades and is easier to form into fan blades with complex curved surfaces.

[0072] For example, in some embodiments, such as Figures 4A-4C As shown, the root 301 of the fan blade 30 includes a protrusion 303 that matches the shape of the second end portion 202. For example, as Figures 3A-3B as well as Figures 4A-4BAs shown, the planar shape of the second end 202 and the protrusion 303 is approximately triangular, which is beneficial to improving the connection stability between the root 301 and the second end 202.

[0073] For example, such as Figure 4A As shown, the sidewall of the protrusion 303 smoothly transitions to the fan blade 30. That is, the sidewall of the protrusion 303 is sloped, and the connection between the protrusion 303 and the fan blade 30 body does not have sharp angles. This avoids generating significant stress at the connection between the protrusion 303 and the fan blade 30 body during fan rotation, preventing breakage of the protrusion 303 at the connection point. For example, in... Figure 4A In the cross section shown by the dashed circle, the part where the protrusion 303 is located is basically trapezoidal, and the base angle of the trapezoid is very small, so that the side wall of the protrusion 303 and the fan blade 30 can be smoothly transitioned, which helps to improve the connection strength between the protrusion 303 and the main body of the fan blade 30.

[0074] For example, in some embodiments, such as Figure 4A As shown, the thickness T1 of the root 301 at the protrusion 303 is 10mm to 40mm, such as 20mm, 25mm or 30mm. With this thickness, the protrusion 303 can be stably connected to the connecting part 20 while ensuring strength.

[0075] For example, in some embodiments, such as Figure 4A As shown, the thickness of each of the plurality of fan blades 30 gradually decreases in the direction from the root 301 to the top 302. This can minimize the weight of the fan blades 30, thereby reducing the centrifugal force on the fan blades 30 during operation, and at the same time reducing the centrifugal force on the root 301 of the fan blades 30.

[0076] For example, Figure 5 This is a schematic diagram of the central disk of the fan. Figure 6 This is an exploded view of the central disk of the fan. In some embodiments, such as... Figure 5 and Figure 6 As shown, the central disk 10 includes a first central disk 101, a second central disk 102, and a central pad 103 stacked together. The middle portions of the first central disk 101 and the second central disk 102 are spaced apart and connected by the central pad 103, for example, by bolts. For example, the thickness of the central pad 103 is equal to the distance between the first central disk 101 and the second central disk 102.

[0077] For example, such as Figure 2 As shown, the central disk 10 may also include a central fixing part 105, which includes a plurality of bolts. The plurality of bolts pass through the first central disk 101, the central pad 103 and the second central disk 102 respectively to fix the first central disk 101, the central pad 103 and the second central disk 102 together.

[0078] For example, such as Figure 6 As shown, the first center disk 101 may further include a plurality of first fixing portions 1011 located on the edge of the first center disk 101, and the second center disk 102 includes a plurality of second fixing portions 1021 located on the edge of the second center disk 102. The plurality of first fixing portions 1011 and the plurality of second fixing portions 1021 correspond one-to-one and are configured to fix the plurality of connecting portions 20. For example, during installation, the correspondingly provided first fixing portions 1011 and second fixing portions 1021 are respectively sandwiched and connected between the first connecting portion 20A and the second connecting portion 20B of the first end 201, such as... Figure 1 , Figure 8 and Figure 9 As shown.

[0079] For example, in some embodiments, such as Figure 6 As shown, the central disk 10 may further include a plurality of edge pads 104, which are respectively sandwiched between a plurality of first fixing parts 1011 and a plurality of second fixing parts 1021. For example, each first fixing part 1011, each second fixing part 1021 and the corresponding edge pad 104 respectively include a plurality of through holes, so that the first fixing part 1011, the second fixing part 1021 and the corresponding edge pad 104 can be fixedly connected by bolts passing through the plurality of through holes.

[0080] For example, in some embodiments, such as Figure 6 As shown, the second center disc 102 may further include a plurality of protrusions 1022, which protrude from the intervals between the plurality of second fixing portions 1021, that is, protrude radially outward from between the plurality of second fixing portions 1022, and are located between adjacent connecting portions 20 in the plurality of connecting portions 20, such as... Figure 1 and Figure 8 As shown, the second central disk 102 is thus formed as an irregularly shaped central disk.

[0081] For example, the side of the second center disk 102 away from the first center disk 101 has an engine that drives the fan blades 30 to rotate and a radiator (not shown in the figure). In this case, the protrusion 1022 can block the return air that bounces back after the fan blows towards the engine or radiator, thereby improving the static pressure efficiency of the fan and reducing the noise of turbulence.

[0082] In the embodiments of this disclosure, static pressure is the physical meaning of the pressure required for the fan to overcome the resistance of the fan system. The magnitude of static pressure determines the airflow. Let the static pressure efficiency be ηs, then ηs = Ps * Q / (1000 * Pw), where Ps is the static pressure in Pa, and Q is the airflow rate in m³ / s. 3 / s; Pw is the shaft power consumption, in kW. Therefore, improving the static pressure efficiency of the fan means that, under the same static pressure and shaft power consumption (engine power consumption), the fan's output air volume, i.e., the generated airflow, is greater; or, under the same output air volume and static pressure, the shaft power consumption (engine power consumption) is reduced.

[0083] For example, in some embodiments, such as Figure 1 As shown, multiple protrusions 1022 extend to the roots of multiple fan blades 30 and are complementary in shape to the multiple connecting portions 20. See also Figure 1 The complementary shape of the protrusion 1022 and the connecting portion 20 means that the protrusion 1022 extends radially from the interval of the second fixing portion 1021 of the second central disk 102 until it reaches the root of the fan blade 30. Thus, the protrusion 1022 precisely fills the gaps between the multiple connecting portions 20, that is, it fills the circumferential gap between the portions of adjacent connecting portions 20 located between the first and second fixing portions of the central disk and the root of the fan blade 30. This reduces or even eliminates the gaps between the multiple connecting portions 20, effectively blocking the backflow air rebounding from the fan after it blows towards the engine or radiator. For example, the planar shape of the protrusion 1022 can be fan-shaped, rectangular, trapezoidal, or other irregular shapes that can block backflow air. Specifically, the planar shape and overall configuration of the protrusion 1022 can be set according to the torsional state of the connecting portion 20. The embodiments of this disclosure do not limit the specific shape of the protrusion 1022. For example, the surface of the protrusion 1022 can be a flat surface, a curved surface, or other surface forms that can block the return airflow. The embodiments of this disclosure do not limit this.

[0084] For example, the second center plate 102 and the protrusion 1022 can be an integral structure or a separate structure. In this case, the protrusion 1022 can be installed on the second center plate 102 by means of bolts, rivets or welding. For example, in some examples, the protrusion 1022 can also be in the form of a small fan blade, as long as it can adequately block the return airflow.

[0085] For example, in some embodiments, such as Figure 1As shown, the gap L1 between adjacent protrusions 1022 and connecting portion 20 can be 5mm to 12mm, such as 6mm, 8mm, or 10mm, etc., and the gap L2 between adjacent protrusions 1022 and fan blade 30 can be 5mm to 20mm, such as 8mm, 10mm, 13mm, or 18mm, etc. Without affecting the rotation of fan blade 30, the smaller the gap L1 between protrusion 1022 and connecting portion 20 and the gap L2 between protrusion 1022 and fan blade 30, the better the effect of protrusion 1022 in blocking the return airflow. Verification shows that when gaps L1 and L2 are within the above ranges, protrusion 1022 does not affect the rotation of fan blade 30, while simultaneously maintaining a good effect in blocking the return airflow.

[0086] For example, in some embodiments, the thickness of the first central disk 101 and the second central disk 102 can be 4mm to 12mm, such as 6mm, 8mm, or 10mm; the distance between the first central disk 101 and the second central disk 102 can be 10mm to 55mm, such as 20mm, 30mm, 40mm, or 50mm. In this case, the thickness of the central pad 103 and the edge pad 104 can be equal to the distance between the first central disk 101 and the second central disk 102, and the distance between the first connecting portion 20A and the second connecting portion 20B of the plurality of connecting portions 20 is equal to the sum of the thickness of the first central disk 101 and the second central disk 102 and the distance between the first central disk 101 and the second central disk 102. This facilitates a tight connection between the connecting portions 20, the central disk 10, and the fan blade 30, ensuring connection stability.

[0087] It should be noted that the dimensions described above in the embodiments of this disclosure are exemplary. In different application scenarios, these dimensions can be selected according to requirements, and the embodiments of this disclosure do not impose specific limitations on them.

[0088] In summary, the embodiments of this disclosure, through the above-described structural design of the central disk 10, the connecting part 20, and the fan blades 30, enable the fan to have higher static pressure efficiency and better air blowing effect, and its manufacturing process is simple, which helps to reduce manufacturing costs.

[0089] The following points also need to be explained:

[0090] (1) The accompanying drawings of the embodiments of this disclosure only involve the structures involved in the embodiments of this disclosure. Other structures can be referred to the general design.

[0091] (2) For clarity, the thickness of layers or regions in the drawings used to describe embodiments of the present disclosure is enlarged or reduced, i.e., these drawings are not drawn to actual scale.

[0092] (3) Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0093] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. The scope of protection of this disclosure shall be determined by the scope of the claims.

Claims

1. A fan, comprising: Central disk; A plurality of connecting portions, wherein each of the plurality of connecting portions has an opposing first end and a second end, the first end being configured to be detachably connected to the central disk; Multiple fan blades, wherein the multiple fan blades are respectively configured to be detachably connected to the second end of the multiple connecting parts, so as to be connected to the central disk through the multiple connecting parts; Each of the plurality of connecting portions is in a torsional state along the direction from the first end to the second end; Each of the plurality of connecting portions further has a torsion portion connected between the first end and the second end, the torsion portion being in the torsion state, and the first end and the second end being in a planar state; The plane where the first end is located is the first plane. From the first end to the second end, the angle between the cross section obtained by cutting the twisted part in a direction perpendicular to the first plane and the first plane gradually increases.

2. The fan according to claim 1, wherein, In the direction from the first end to the second end, at least a portion of the contour lines of the multiple cross sections obtained by cutting the torsion portion in a direction perpendicular to the first plane are all straight lines.

3. The fan according to claim 1, wherein, The portion of the outline of at least a portion of the cross-sections obtained by cutting the torsion portion in a direction perpendicular to the first plane from the first end to the second end is a curve.

4. The fan according to claim 3, wherein, The curve includes a wavy line.

5. The fan according to claim 3, wherein, The curve includes a sine curve.

6. The fan according to claim 1, wherein, The rate at which the included angle increases varies in the direction from the first end to the second end.

7. The fan according to claim 1, wherein, The rate at which the included angle increases gradually in the direction from the first end to the second end.

8. The fan according to any one of claims 1-7, wherein, The width of each of the plurality of connecting parts is smaller than the width of each of the plurality of fan blades.

9. The fan according to any one of claims 1-7, wherein, Each of the plurality of connecting parts includes a first connecting part and a second connecting part that are stacked and detachably connected to each other. The portion of the central disk connected to the first end is sandwiched and connected between the first connecting portion and the second connecting portion, and the portions of the plurality of fan blades connected to the second end are respectively sandwiched and connected between the first connecting portion and the second connecting portion.

10. The fan according to claim 9, wherein, The thickness of the first connecting part and the second connecting part is 3mm to 12mm respectively, and the distance between the first connecting part and the second connecting part is 20mm to 60mm.

11. The fan according to any one of claims 1-7, wherein, Along the direction from the first end to the second end, the length of the torsional portion of each of the plurality of connecting portions is 50mm to 230mm. The width of the torsion portion of each of the plurality of connecting parts is 80mm~300mm. The torsion angle of each of the plurality of connecting parts is 10° to 45°.

12. The fan according to any one of claims 1-7, wherein, The plurality of fan blades have curvature in the same direction and no torsional angle.

13. The fan according to any one of claims 1-7, wherein, Each of the plurality of fan blades includes a root portion connected to a second end of the plurality of connecting portions and a top portion opposite to the root portion. The root portion includes a protrusion that matches the shape of the second end portion.

14. The fan according to claim 13, wherein, The raised sidewalls transition smoothly into the fan blades.

15. The fan according to claim 13, wherein, The thickness of the root at the protrusion is 10mm to 40mm.

16. The fan according to claim 13, wherein, The thickness of each of the plurality of fan blades gradually decreases in the direction from the root to the top.

17. The fan according to any one of claims 1-7, wherein, The central disk includes a first central disk, a second central disk, and a central pad stacked together, wherein the middle portions of the first central disk and the second central disk are separated and connected by the central pad.

18. The fan according to claim 17, wherein, The first central disk includes a plurality of first fixing parts located on the edge of the first central disk, and the second central disk includes a plurality of second fixing parts located on the edge of the second central disk. The plurality of first fixing parts and the plurality of second fixing parts correspond one-to-one and are configured to fix the plurality of connecting parts. Each of the plurality of connecting parts includes a first connecting part and a second connecting part that are stacked together. The corresponding first fixing part and second fixing part are respectively sandwiched and connected between the first connecting part and the second connecting part at the first end.

19. The fan according to claim 18, wherein, The central disk also includes a plurality of edge pads, which are respectively sandwiched between the first fixing part and the plurality of second fixing parts.

20. The fan according to claim 18, wherein, The second center disc includes a plurality of protrusions that protrude radially outward from between the plurality of second fixing portions and are located between adjacent connecting portions among the plurality of connecting portions.

21. The fan according to claim 20, wherein, The plurality of protruding portions extend to the roots of the plurality of fan blades and are complementary in shape to the plurality of connecting portions.

22. The fan according to claim 21, wherein, The gap between adjacent protrusions and connecting parts is 5mm~12mm, and the gap between adjacent protrusions and fan blades is 5mm~20mm.

23. The fan according to claim 17, wherein, The thickness of the first and second central disks is 4mm to 12mm, respectively; the distance between the first and second central disks is 10mm to 55mm.

24. The fan according to any one of claims 1-7, wherein, Each of the plurality of fan blades includes a first material layer and a second material layer stacked together. The first material layer comprises a plain weave prepreg made of epoxy resin and a first glass fiber composite, and the second material layer comprises a chopped prepreg made of epoxy resin and a second glass fiber composite. The length of the first glass fiber is greater than the length of the second glass fiber.

25. The fan according to any one of claims 1-7, wherein, The materials of the plurality of connecting parts include metallic materials.

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