Wind wheel and air conditioner

Abstract

The utility model discloses a wind wheel and an air conditioner, and relates to the technical field of air conditioners. The wind wheel comprises the hub, the first reinforcing ribs and the multiple blades, the multiple blades are connected to the peripheral wall of the hub, the thinning parts of the blades are connected with the front edge parts, the maximum thickness of the thinning parts is smaller than that of the front edge parts, the overall weight of the wind wheel can be reduced, and the working efficiency of the wind wheel is improved. The first reinforcing ribs are arranged on the inner sides of the blades, wind resistance can be reduced, noise can be reduced, meanwhile, the risk that the front edge part is broken can be reduced, and the stability of connection between the front edge part and the hub is improved. Due to the fact that force borne by the side, close to the front edge part, of the thinning part is large, one end of the first reinforcing rib is connected with the hub, the other end of the first reinforcing rib extends into the thinning part through the front edge part, part of force borne by the thinning part can be transferred to the hub through the first reinforcing rib, stress borne by the thinning part is dispersed, stress concentration is reduced, and the service life of the hub is prolonged. Therefore, the risk of breakage of the thinned part is reduced, and the overall reliability of the wind wheel is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to an impeller and an air conditioner. Background Art

[0002] In the related art, an axial flow impeller is usually arranged on the outdoor unit of an air conditioner. In order to reduce the overall weight of the axial flow impeller, a thinning part is arranged on the blade of the axial flow impeller, and the thickness of the thinning part is reduced to reduce the weight of the axial flow impeller. However, during the high-speed rotation of the axial flow impeller, the leading edge of the blade is subjected to a large centrifugal force, which is easy to transmit the force to the thinning part. Therefore, the force received by the thinning part near the leading edge of the blade is large, increasing the risk of rupture. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides an impeller, which can reduce the rupture risk of the thinning part and improve the reliability.

[0004] The utility model also provides an air conditioner with the above impeller.

[0005] The impeller according to the first aspect embodiment of the utility model includes: a hub;

[0006] A plurality of blades are circumferentially spaced and connected to the outer peripheral wall of the hub. The blade includes a root portion, a leading edge portion and a thinning portion. The root portion is connected between the thinning portion and the hub. The leading edge portion is connected to one side of the thinning portion. Along the axial direction of the impeller, the maximum thickness of the thinning portion is less than the maximum thickness of the leading edge portion;

[0007] A first reinforcing rib is fixedly connected to the inner side of the blade. One end of the first reinforcing rib is connected to the hub, and the other end of the first reinforcing rib extends into the thinning portion through the leading edge portion.

[0008] The impeller according to the embodiment of the utility model has at least the following beneficial effects:

[0009] By arranging a plurality of blades connected to the outer peripheral wall of the hub, the thinning part and the leading edge part of the blade are connected, and the maximum thickness of the thinning part is less than the maximum thickness of the leading edge part. Therefore, setting the thinning part can reduce the overall weight of the wind turbine and improve the working efficiency of the wind turbine. The first reinforcing rib is arranged on the inner side rather than the outer side of the blade, which can reduce wind resistance, improve the rotation efficiency of the wind turbine, reduce noise, and at the same time can reduce the risk of fracture of the leading edge part and improve the stability of the connection between the leading edge part and the hub. Since the force received by the thinning part on the side close to the leading edge part is relatively large, one end of the first reinforcing rib is connected to the hub, and the other end extends into the thinning part through the leading edge part. Therefore, a part of the force received by the thinning part can be transferred to the hub through the first reinforcing rib, dispersing the stress received by the thinning part, reducing stress concentration, thereby reducing the risk of rupture of the thinning part and improving the overall reliability of the wind turbine.

[0010] According to some embodiments of the present invention, the hub includes an annular part, a bushing and a plurality of connecting ribs. The bushing is located inside the annular part and is spaced from the inner wall of the annular part. The plurality of connecting ribs are located between the annular part and the bushing and are spaced along the circumferential direction of the bushing. Both ends of the plurality of connecting ribs are respectively connected to the bushing and the annular part;

[0011] On the projection plane perpendicular to the rotation axis of the wind turbine, the two intersection points formed between the outer contour line of the first reinforcing rib and the outer contour line of the annular part are point A and point B respectively, and the rotation center point of the wind turbine is point O. One end of the connecting rib connected to the annular part is located within the area enclosed by the connection lines of point A, point B and point O.

[0012] According to some embodiments of the present invention, on the projection plane perpendicular to the rotation axis of the wind turbine, the intersection point of the outer contour line of the blade root and the outer contour line of the leading edge part is point E. The tangent line of the leading edge part at point E is M3. The two intersection points formed between the outer contour line of the first reinforcing rib and the outer contour line of the hub are point A and point B respectively. The midpoint between point A and point B on the outer contour line of the hub is point C. The connection line between the end point of the first reinforcing rib far from the hub and point C is M1. The rotation center point of the wind turbine is point O. The connection line passing through point O and point C is M4;

[0013] Among them, the connection line M1 is located between the tangent line M3 and the connection line M4.

[0014] According to some embodiments of the present invention, the included angle α between the connection line M1 between the end point of the first reinforcing rib far from the hub and point C and the tangent line M3 of the leading edge part at point E satisfies: α > 0°.

[0015] According to some embodiments of the present utility model, a second reinforcing rib is provided on the inner side of the blade. One end of the second reinforcing rib is connected to the hub, and the other end of the second reinforcing rib extends into the thinning portion and is spaced apart from the first reinforcing rib.

[0016] According to some embodiments of the present utility model, on the projection plane perpendicular to the rotation axis of the wind turbine, the two intersection points formed between the outer contour line of the second reinforcing rib and the outer contour line of the hub are point F and point G respectively. The midpoint between point F and point G on the outer contour line of the hub is point J, and the connection line between the end point of the second reinforcing rib far from the hub and point J is M2;

[0017] Wherein, the included angle between the connection line M1 and the connection line M4 is β, and the included angle between the connection line M2 and the connection line M4 is γ, satisfying: β≥γ.

[0018] According to some embodiments of the present utility model, on the projection plane perpendicular to the rotation axis of the wind turbine, the outer contour line of the second reinforcing rib includes a connected second arc segment and two second straight line segments. The second arc segment is connected to the outer contour line of the hub, and the two second straight line segments are arranged at intervals along the circumferential direction of the hub. The distance between the intersection points where the two second straight line segments extend to the outer contour line of the hub is L2, satisfying: L2≥3mm.

[0019] According to some embodiments of the present utility model, on the projection plane perpendicular to the rotation axis of the wind turbine, the outer contour line of the first reinforcing rib includes a connected first arc segment and two first straight line segments. The first arc segment is connected to the outer contour line of the hub, and the two first straight line segments are arranged at intervals along the circumferential direction of the hub. The distance between the intersection points where the two first straight line segments extend to the outer contour line of the hub is L1, satisfying: L1≥3mm.

[0020] According to some embodiments of the present utility model, a plurality of ribs are provided on the inner side of the thinning portion, and the plurality of ribs are arranged in a mesh structure.

[0021] According to some embodiments of the present utility model, the plurality of ribs include a plurality of first ribs and a plurality of second ribs. The plurality of first ribs are arranged at intervals in a first direction, and the plurality of second ribs are arranged at intervals in a second direction and are connected to the first ribs. The first direction and the second direction are arranged at an included angle.

[0022] According to some embodiments of the present utility model, a plurality of convex portions are provided in the gap regions between adjacent ribs on the inner side of the thinning portion.

[0023] According to some embodiments of the present utility model, on the projection plane perpendicular to the rotation axis of the wind wheel, the maximum length of the convex portion is D, satisfying: 2 mm ≤ D ≤ 20 mm.

[0024] According to some embodiments of the present utility model, the maximum height H1 of the convex portion protruding from the thinning portion and the maximum height H2 of the rib protruding from the thinning portion satisfy: H1 ≥ 0.5 mm, and H1 ≤ H2.

[0025] The air conditioner according to the embodiment of the second aspect of the present utility model includes the wind wheel described in the above embodiment.

[0026] The air conditioner according to the embodiment of the present utility model has at least the following beneficial effects:

[0027] By adopting the wind wheel of the embodiment of the first aspect, the wind wheel is connected to the outer peripheral wall of the hub by arranging a plurality of blades. The thinning portion of the blade is connected to the leading edge portion, and the maximum thickness of the thinning portion is less than the maximum thickness of the leading edge portion. Therefore, setting the thinning portion can reduce the overall weight of the wind wheel and improve the working efficiency of the wind wheel. The first reinforcing rib is arranged on the inner side rather than the outer side of the blade, which can reduce wind resistance, improve the rotation efficiency of the wind wheel, reduce noise, and at the same time can reduce the risk of fracture of the leading edge portion and improve the connection stability between the leading edge portion and the hub. Since the force received by the thinning portion on the side close to the leading edge portion is relatively large, one end of the first reinforcing rib is connected to the hub, and the other end extends through the leading edge portion into the thinning portion. Therefore, a part of the force received by the thinning portion can be transferred to the hub through the first reinforcing rib, dispersing the stress received by the thinning portion, reducing stress concentration, thereby reducing the risk of rupture of the thinning portion and improving the overall reliability of the wind wheel.

[0028] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0029] The following further describes the present utility model in conjunction with the drawings and embodiments, where:

[0030] Figure 1 is a schematic structural diagram of a wind wheel according to an embodiment of the present utility model;

[0031] Figure 2 is a schematic inner structure diagram of a wind wheel according to an embodiment of the present utility model;

[0032] Figure 3 is Figure 2 the enlarged view at K in

[0033] Figure 4 is Figure 3 the structural diagram after extending the first straight line segment and the second straight line segment in

[0034] Figure 5 It is a schematic structural diagram of a blade of a wind wheel in an embodiment of the present utility model when no convex part is provided;

[0035] Figure 6 It is a schematic structural diagram of a blade of a wind wheel in an embodiment of the present utility model when a convex part is provided;

[0036] Figure 7 It is a partial structural sectional view of a thinning part in an embodiment of the present utility model;

[0037] Figure 8 It is a simplified schematic structural diagram of a convex part in an embodiment of the present utility model;

[0038] Figure 9 It is a power comparison curve graph of a wind wheel with and without a thinning part in an embodiment of the present utility model.

[0039] Reference numerals:

[0040] Wind wheel 1000;

[0041] Hub 100; Bush 110; Connecting rib 120; Annular part 130;

[0042] Blade 200; Thinning part 210; First rib 211; Second rib 212; Convex part 213; Leading edge part 220; Blade root part 230; Trailing edge part 240; Blade tip part 250;

[0043] First reinforcing rib 300; First arc segment 310; First straight segment 320;

[0044] Second reinforcing rib 400; Second arc segment 410; Second straight segment 420. Detailed implementation manners

[0045] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0046] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc., which relate to the orientation description, is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0047] In the description of the present utility model, the meaning of "a number of" is one or more, the meaning of "a plurality of" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the base number, and understandings such as "above", "below", "within", etc. include the base number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0048] In the description of the present utility model, unless otherwise clearly defined, words such as "arrangement", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0049] Refer to Figure 1 and Figure 2 As shown in

[0050] Refer to Figure 2 As shown in

[0051] In order to achieve a better air outlet effect, the rotation direction of the wind wheel 1000 is usually fixed. For example, refer to Figure 2As shown, when the wind turbine 1000 operates, it rotates in the clockwise direction. Therefore, the part of the blade 200 at the front end in the rotation direction is the leading edge portion 220, and the part at the rear end in the rotation direction is the trailing edge portion 240. The blade root portion 230 is the part where the blade 200 is connected to the hub 100, and the blade tip portion 250 is located at one end of the blade 200 away from the blade root portion 230. The thinning portion 210 is located in the middle of the blade 200 and is surrounded and connected to the leading edge portion 220, the blade root portion 230, the trailing edge portion 240, and the blade tip portion 250. The maximum thickness of the thinning portion 210 is less than the maximum thickness of the leading edge portion 220. Since the force on the thinning portion 210 is relatively small, the weight of the blade 200 is reduced by reducing the thickness.

[0052] Referring to Figure 2 and Figure 3 As shown, the first reinforcing rib 300 is fixedly connected to the inner side of the blade 200. The inner side of the blade 200 refers to the back surface in the air outlet direction of the wind turbine 1000. Therefore, the inner side of the blade 200 is the suction surface, and the outer side of the blade 200 is the pressure surface. One end of the first reinforcing rib 300 is connected to the hub 100, and the other end of the first reinforcing rib 300 extends into the thinning portion 210 through the leading edge portion 220, for example, on the side close to the leading edge portion 220 within the thinning portion 210. It should be noted that the side of the thinning portion 210 close to the leading edge portion 220 means that: on the projection plane perpendicular to the rotation axis of the wind turbine 1000, a line is connected between the center point of the hub 100 and the midpoint in the circumferential direction of the hub 100 on the side of the thinning portion 210 close to the blade root portion 230. After extending the line, the thinning portion 210 can be divided into two parts, and the part close to the leading edge portion 220 is the side of the thinning portion 210 close to the leading edge portion 220.

[0053] It can be understood that by adopting the above scheme, setting the thinning portion 210 can reduce the overall weight of the wind turbine 1000 and improve the working efficiency of the wind turbine 1000. The first reinforcing rib 300 is arranged on the inner side rather than the outer side of the blade 200, which can reduce wind resistance, improve the rotation efficiency of the wind turbine 1000, reduce noise, and at the same time can reduce the risk of fracture of the leading edge portion 220 and improve the connection stability between the leading edge portion 220 and the hub 100. Since the force on the side of the thinning portion 210 close to the leading edge portion 220 is relatively large, one end of the first reinforcing rib 300 is connected to the hub 100, and the other end extends into the thinning portion 210 through the leading edge portion 220. Therefore, a part of the force on the thinning portion 210 can be transferred to the hub 100 through the first reinforcing rib 300, thereby dispersing the stress on the thinning portion 210, reducing stress concentration, and thus reducing the risk of rupture of the thinning portion 210 and improving the overall reliability of the wind turbine 1000.

[0054] Referring to Figure 9 As shown, Figure 9 In [figure], the abscissa represents the air volume, and the ordinate represents the power. Figure 9The curve with a square in it is the solution for weight reduction by setting the thinning part 210 in an embodiment of the present utility model, and the conventional solution with dots is the solution without setting the thinning part 210. As can be seen from the figure, setting the thinning part 210 can reduce the power of the fan, that is, the required power is reduced under the same air volume, and the energy consumption of the fan can be reduced.

[0055] Referring to Figure 3 As shown, in the embodiment of the present utility model, the hub 100 includes an annular part 130, a shaft sleeve 110, and a plurality of connecting ribs 120. The annular part 130 is in a sleeve shape. The shaft sleeve 110 is located inside the annular part 130 and is spaced from the inner wall of the annular part 130. The plurality of connecting ribs 120 are located between the annular part 130 and the shaft sleeve 110 and are spaced circumferentially along the shaft sleeve 110. Both ends of the plurality of connecting ribs 120 are respectively connected to the outer wall of the shaft sleeve 110 and the inner wall of the annular part 130, and the connection method can be integral molding, fastener connection, etc. The shaft sleeve 110 is used to connect to the output shaft of the motor, and the connecting ribs 120 play a role in fixing the relative positions of the shaft sleeve 110 and the annular part 130. On the projection plane perpendicular to the rotation axis of the wind wheel 1000, two intersection points are formed between the outer contour line of the first reinforcing rib 300 and the outer contour line of the outer wall of the annular part 130, and the two intersection points are point A and point B respectively. The rotation center point of the wind wheel 1000 is point O, and one of the connecting ribs 120 is connected to one end of the annular part 130 and is located within the area enclosed by the connection lines of points A, B, and O. It should be noted that one end of the connecting rib 120 connected to the annular part 130 should be understood as the part where the connecting rib 120 contacts the annular part 130.

[0056] It can be understood that a part of the force received by the blade 200 needs to be transmitted to the annular part 130 through the first reinforcing rib 300 to reduce the phenomenon of stress concentration. When only the first reinforcing rib 300 is connected to the annular part 130, the transmission of force may be unsmooth, resulting in a general effect of reducing stress concentration. Therefore, by setting one of the connecting ribs 120 to be connected to one end of the annular part 130 and located within the area enclosed by the connection lines of points A, B, and O, it is ensured that one end of the first reinforcing rib 300 and one end of one of the connecting ribs 120 are aligned or as aligned as possible. Therefore, the force received by the first reinforcing rib 300 can be transmitted to the shaft sleeve 110 through the first connecting rib 120, so that the connecting rib 120 and the first reinforcing rib 300 can play a supporting role, effectively dispersing the stress received by the leading edge part 220 and the thinning part 210, reducing stress concentration, reducing the risk of rupture of the leading edge part 220, and improving the reliability and stability of the leading edge part 220.

[0057] Referring to Figure 3As shown, in the embodiment of the present utility model, one side of the blade root 230 is connected to the leading edge part 220, the other side of the blade root 230 is connected to the outer peripheral wall of the hub 100, and the first reinforcing rib 300 is connected to the blade root 230. On the projection plane perpendicular to the rotation axis of the wind turbine 1000, the intersection point of the outer contour line of the blade root 230 and the outer contour line of the leading edge part 220 is point E, the tangent line of the leading edge part 220 at point E is M3, the two intersection points formed between the outer contour line of the first reinforcing rib 300 and the outer contour line of the hub 100 are point A and point B respectively, the midpoint between point A and point B on the outer contour line of the hub 100 is point C, the connection line between the end point of the first reinforcing rib 300 far from the hub 100 and point C is M1, the rotation center point of the wind turbine 1000 is point O, and the connection line passing through point O and point C is M4. Among them, the connection line M1 is located between the tangent line M3 and the connection line M4, and an included angle α is formed between the connection line M1 and the tangent line M3, satisfying: α > 0°, for example, the value of α can be 1°, 15°, 30°, 60°, etc.

[0058] It can be understood that due to the large stress at the connection between the blade root 230 and the hub 100, after long-term use, adverse effects such as cracking and deformation may occur at the connection between the blade root 230 and the hub 100. By setting the connection line M1 between the tangent line M3 and the connection line M4, that is, the first reinforcing rib 300 is located on the front side of the blade root 230 close to the rotation direction of the wind turbine 1000, and the first reinforcing rib 300 extends in the direction towards the blade tip 250, the overall strength of the blade root 230 can be effectively increased. When α is equal to 0°, that is, the connection line M1 is parallel to the tangent line M3. At this time, the pressure received by the leading edge part 220 is difficult to be transmitted to the hub 100 through the first reinforcing rib 300, which is not conducive to stress dispersion. Therefore, by designing the included angle α between the connection line M1 and the tangent line M3 to be greater than 0°, while increasing the overall strength of the leading edge part 220 and the blade root 230 through the first reinforcing rib 300, the stress received by the leading edge part 220 and the blade root 230 can be effectively dispersed to improve the reliability of the leading edge part 220 and the blade root 230.

[0059] Refer to Figure 3 As shown, in the embodiment of the present utility model, a second reinforcing rib 400 is provided inside the blade 200. One end of the second reinforcing rib 400 is connected to the hub 100, and the other end of the second reinforcing rib 400 extends into the thinning part 210 and is arranged at an interval from the first reinforcing rib 300. By providing the second reinforcing rib 400, the stability when the blade root 230 is connected to the hub 100 can be further improved, and at the same time, the stress concentration situation received by the thinning part 210 can be further dispersed, reducing the risk of rupture of the thinning part 210, and improving the safety and stability during the operation of the wind turbine 1000.

[0060] Continue to refer to Figure 3As shown, in the embodiment of the present utility model, on the projection plane perpendicular to the rotation axis of the wind wheel 1000, the two intersection points formed between the outer contour line of the second reinforcing rib 400 and the outer contour line of the hub 100 are the F point and the G point respectively. The midpoint between the F point and the G point on the outer contour line of the hub 100 is the J point. The connection line between the end point of the second reinforcing rib 400 far from the hub 100 and the J point is M2. Among them, the included angle between the connection line M1 and the connection line M4 is β, and the included angle between the connection line M2 and the connection line M4 is γ, satisfying: β≥γ, that is, the connection line M1 and the connection line M2 can be parallel or arranged at an included angle. When γ is greater than β, the second reinforcing rib 400 will intersect with the first reinforcing rib 300, and it is difficult for the second reinforcing rib 400 to play the role of dispersing the force on the blade 200. Therefore, setting the included angle β between the connection line M1 and the connection line M4 to be greater than or equal to the included angle γ between the connection line M2 and the connection line M4 can ensure that the first reinforcing rib 300 and the second reinforcing rib 400 are arranged at intervals, so that the pressure received by the thinning part 210 and the blade root part 230 is transmitted to the hub 100 through the first reinforcing rib 300 and the second reinforcing rib 400, thereby dispersing the load, effectively reducing the risk of blade 200 fracture, and reducing the risk of rupture of the thinning part 210, and improving the overall strength of the blade 200.

[0061] Referring to Figure 4 As shown, in the embodiment of the present utility model, on the projection plane perpendicular to the rotation axis of the wind wheel 1000, the outer contour line of the first reinforcing rib 300 includes a connected first arc segment 310 and two first straight line segments 320. The first arc segment 310 is connected to the outer contour line of the hub 100. The two first straight line segments 320 are arranged at intervals along the circumferential direction of the hub 100. The distance between the intersection points where the two first straight line segments 320 extend to the outer contour line of the hub 100 is L1, satisfying: L1≥3mm. For example, the value of L1 can be 3mm, 4mm, 6mm, 10mm, etc. The outer contour line of the second reinforcing rib 400 includes a connected second arc segment 410 and two second straight line segments 420. The second arc segment 410 is connected to the outer contour line of the hub 100. The two second straight line segments 420 are arranged at intervals along the circumferential direction of the hub 100. The distance between the intersection points where the two second straight line segments 420 extend to the outer contour line of the hub 100 is L2, satisfying: L2≥3mm. For example, the value of L2 can be 3mm, 4mm, 6mm, 10mm, etc.

[0062] It can be understood that since the connections between the first reinforcing rib 300, the second reinforcing rib 400 and the hub 100 are usually transitioned with rounded corners, the phenomenon of stress concentration is reduced. Therefore, on the projection plane perpendicular to the rotation axis of the wind turbine 1000, the outer contour lines of the first reinforcing rib 300 and the second reinforcing rib 400 respectively include a first arc segment 310 and a second arc segment 410. Among them, L1 and L2 reflect the thickness sizes of the first reinforcing rib 300 and the second reinforcing rib 400 along the circumferential direction of the hub 100. When L1 is less than 3 mm and L2 is less than 3 mm, the thicknesses of the first reinforcing rib 300 and the second reinforcing rib 400 are relatively small, the overall strength is low, it is difficult to play a role in increasing the overall strength of the blade 200, the cracking risk at the connection between the blade 200 and the hub 100 is relatively high, and the thinning part 210 is prone to rupture. Therefore, by designing L1 greater than 3 mm and L2 greater than 3 mm, ensuring that the thicknesses of the first reinforcing rib 300 and the second reinforcing rib 400 are within a suitable range, the overall strength of the blade 200 can be increased, the load can be effectively dispersed, and the reliability of the blade 200 can be improved.

[0063] Referring to Figure 5 As shown, in the embodiment of the present invention, a plurality of ribs are provided on the inner side of the thinning part 210, and the plurality of ribs are arranged in a mesh structure, that is, the plurality of ribs are connected. It can be understood that by providing a plurality of ribs in the thinning part 210, the ribs can divide the thinning part 210 into a plurality of thinning areas with smaller areas, which can improve the overall strength of the thinning part 210, effectively reduce the risk of rupture of the thinning part 210, and improve the overall reliability of the thinning part 210.

[0064] Continuing to refer to Figure 5 As shown, in the embodiment of the present invention, the plurality of ribs include a plurality of first ribs 211 and a plurality of second ribs 212. The plurality of first ribs 211 are arranged at intervals along a first direction, and the plurality of second ribs 212 are arranged at intervals along a second direction and are connected to the first ribs 211. Among them, the first direction and the second direction are arranged at an angle. For example, the first direction can be along the circumferential direction of the hub 100, and the second direction can be along the radial direction of the hub 100. Both the first ribs 211 and the second ribs 212 are provided with three and are in an arc shape to adapt to the bending deformation direction of the thinning area. By designing the plurality of ribs to include the first ribs 211 and the second ribs 212, the first ribs 211 and the second ribs 212 divide the thinning part 210 into more thinning areas with smaller areas, which can effectively improve the overall strength of the thinning part 210 and effectively reduce the risk of rupture of the thinning part 210.

[0065] Referring to Figure 2As shown, in the embodiment of the present utility model, one end of the first reinforcing rib 300 only needs to extend into one of the thinning areas closest to the leading edge portion 220 and the blade root portion 230. The reason is that the stress on the thinning area here is the greatest and it is also the position most prone to cracking. And if the length of the first reinforcing rib 300 is too long, it is likely to cause an increase in wind resistance and noise when the blade 200 rotates. Therefore, the first reinforcing rib 300 should not be too long. Extending it into one of the thinning areas closest to the leading edge portion 220 and the blade root portion 230 can improve the situation that the thinning portion 210 is prone to cracking.

[0066] Referring to Figure 5 and Figure 6 As shown, in the embodiment of the present utility model, a plurality of convex portions 213 are provided in the gap area between the first rib 211 and the second rib 212 on the inner side of the thinning portion 210. The gap area is the thinning area. The convex portions 213 can be columnar, elliptical, cylindrical, or similar to the shape of a Go piece. For example, at least one convex portion 213 is provided in each thinning area, and only one convex portion 213 is provided in some of the thinning areas, and two convex portions 213 are provided in other thinning areas. When at least two convex portions 213 are provided in a thinning area, the at least two convex portions 213 in a thinning area are arranged at intervals along the circumferential direction of the hub 100, or arranged at intervals along the radial direction of the hub 100. It can be understood that when no convex portion 213 is provided in the thinning area, referring to Figure 5 As shown, Figure 5 The dashed arrow in Figure 6 As shown, Figure 6 represents the direction of the air flow. At this time, when the air flow passes through the thinning area, the undulating amplitude is relatively large, the flow resistance increases, resulting in a decrease in the rotation efficiency of the wind wheel 1000 and an increase in the power required by the wind turbine. Referring to

[0067] Referring to Figure 7 As shown, in the embodiment of the present utility model, on the projection plane perpendicular to the rotation axis of the wind wheel 1000, the maximum length of the convex portion 213 is D, satisfying: 2mm ≤ D ≤ 20mm. For example, the value of D can be 2M, 5mm, 8mm, 15mm, 18mm, 20mm, etc. It should be noted that the maximum length D of the convex portion 213 can also be understood as the diameter of the minimum circumscribed circle of the outer contour line of the convex portion 213. For example, referring to Figure 8 As shown, Figure 8The dash-dotted circle therein is the minimum circumscribing circle of the convex portion 213, and the diameter of the minimum circumscribing circle is D. Herein, the minimum circumscribing circle refers to finding a circle on a plane that can just contain all the points of the contour while minimizing the radius of the circle. When D is less than 2 mm, the proportion of the area of the convex portion 213 in the thinning area is small, and it is difficult to play a role in reducing the amplitude of the airflow undulation, resulting in an increase in the movement resistance of the airflow. When D is greater than 20 mm, the proportion of the area of the convex portion 213 in the thinning area is large, and the weight reduction effect of the thinning portion 210 is not obvious, and the overall weight of the wind turbine 1000 increases. Therefore, by reasonably designing the maximum length D of the convex portion 213 within the range of 2 mm to 20 mm, it is possible to reduce the amplitude of the airflow undulation while ensuring that the thinning portion 210 has an appropriate weight reduction effect, reduce the rotational resistance of the wind turbine 1000, and improve the rotational efficiency of the wind turbine 1000.

[0068] Referring to Figure 7 As shown, in the embodiment of the present invention, the maximum height H1 of the convex portion 213 protruding from the thinning portion 210 and the maximum height H2 of the rib protruding from the thinning portion satisfy: 0.5 mm ≤ H1, H1 ≤ H2. For example, the value of H1 can be 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc., and H1 = H2, H1 = 0.8 * H2, H1 = 0.7 * H2, H1 = 0.5 * H2, etc. When H1 is less than 0.5 mm, the height of the convex portion 213 protruding is low, and it is difficult to play a role in reducing the amplitude of the airflow undulation, resulting in an increase in the movement resistance of the airflow. Since the overall thickness of the blade 200 is usually 5 mm or less, H1 is usually less than or equal to 5 mm. When H1 is greater than 5 mm, the height of the convex portion 213 protruding is high. When it is higher than the height of the leading edge portion 220, it will cause an increase in the movement resistance of the airflow and a decrease in the rotational efficiency of the wind turbine 1000. Therefore, by reasonably designing the maximum height H1 of the convex portion 213 protruding from the thinning portion 210 within the range of 0.5 mm to 5 mm and H1 being less than or equal to H2, it is possible to reduce the amplitude of the airflow undulation, thereby reducing the movement resistance of the airflow and improving the rotational efficiency of the wind turbine 1000.

[0069] An air conditioner according to an embodiment of the present utility model includes the impeller 1000 of the above embodiment. The air conditioner according to the embodiment of the present utility model adopts the impeller 1000 of the above embodiment. The impeller 1000 is connected to the outer peripheral wall of the hub 100 by providing a plurality of blades 200. The thinning portion 210 and the leading edge portion 220 of the blade 200 are connected, and the maximum thickness of the thinning portion 210 is less than the maximum thickness of the leading edge portion 220. Therefore, setting the thinning portion 210 can reduce the overall weight of the impeller 1000 and improve the working efficiency of the impeller 1000. The first reinforcing rib 300 is provided inside the blade 200 and connected to the leading edge portion 220. Therefore, the risk of fracture of the leading edge portion 220 can be reduced, and the stability of the connection between the leading edge portion 220 and the hub 100 can be improved. Since the force received by the thinning portion 210 on the side close to the leading edge portion 220 is relatively large, one end of the first reinforcing rib 300 is connected to the hub 100, and the other end extends into the thinning portion 210. Therefore, a part of the force received by the thinning portion 210 can be transferred to the hub 100 through the first reinforcing rib 300, thereby dispersing the stress received by the thinning portion 210, reducing stress concentration, and thus reducing the risk of rupture of the thinning portion 210 and improving the overall reliability of the impeller 1000.

[0070] Since the air conditioner adopts all the technical solutions of the impeller 1000 of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be elaborated here.

[0071] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present utility model.

Claims

1. A wind wheel, characterized in that: include: Wheel hub; A plurality of blades are connected to the outer peripheral wall of the hub at intervals along the circumferential direction of the hub, the blades comprising a blade root portion, a leading edge portion and a thinned portion, the blade root portion is connected between the thinned portion and the hub, the leading edge portion is connected to one side of the thinned portion, and along the axial direction of the wind wheel, the maximum thickness of the thinned portion is less than the maximum thickness of the leading edge portion; A first reinforcing rib is fixedly connected to the inner side of the blade, one end of the first reinforcing rib is connected to the hub, and the other end of the first reinforcing rib extends into the thinned portion through the leading edge portion.

2. The wind wheel according to claim 1, characterized in that: The hub comprises an annular portion, a sleeve and a plurality of connecting ribs, wherein the sleeve is located inside the annular portion and is spaced apart from the inner wall of the annular portion, the plurality of connecting ribs are located between the annular portion and the sleeve and are spaced apart along the circumference of the sleeve, and the two ends of the plurality of connecting ribs are respectively connected to the sleeve and the annular portion; On the projection plane perpendicular to the rotation axis of the wind wheel, the two intersection points formed between the outer contour line of the first reinforcing rib and the outer contour line of the annular portion are point A and point B respectively, the rotation center point of the wind wheel is point O, and one end of one of the connecting ribs connected to the annular portion is located in the area enclosed by the line connecting point A, point B and point O.

3. The wind wheel according to claim 1, characterized in that: On the projection plane perpendicular to the rotation axis of the wind wheel, the intersection of the outer contour line of the blade root and the outer contour line of the leading edge is point E, the tangent line of the leading edge at point E is M3, the two intersection points formed between the outer contour line of the first reinforcing rib and the outer contour line of the hub are point A and point B respectively, the midpoint of the outer contour line of the hub between point A and point B is point C, the line between the endpoint of the end of the first reinforcing rib away from the hub and point C is M1, the rotation center point of the wind wheel is point O, and the line passing through point O and point C is M4; The connecting line M1 is located between the tangent line M3 and the connecting line M4.

4. The wind wheel according to claim 3, characterized in that: The angle between the line M1 between the endpoint of the end of the first reinforcing rib away from the hub and the point C and the tangent M3 of the leading edge at the point E is α, satisfying: α>0°.

5. The wind wheel according to claim 3, characterized in that: A second reinforcing rib is disposed on the inner side of the blade, one end of the second reinforcing rib is connected to the hub, and the other end of the second reinforcing rib extends into the thinning portion and is spaced apart from the first reinforcing rib.

6. The wind wheel according to claim 5, characterized in that: On a projection plane perpendicular to the rotation axis of the wind wheel, two intersection points formed between the outer contour line of the second reinforcing rib and the outer contour line of the hub are point F and point G respectively, the midpoint of the outer contour line of the hub between point F and point G is point J, and the line connecting the endpoint of the end of the second reinforcing rib away from the hub and point J is M2; The angle between the line M1 and the line M4 is β, and the angle between the line M2 and the line M4 is γ, satisfying: β≥γ.

7. The wind wheel according to claim 5, characterized in that: On the projection plane perpendicular to the rotation axis of the wind wheel, the outer contour line of the second reinforcement rib includes a connected second arc segment and two second straight line segments, the second arc segment is connected to the outer contour line of the hub, the two second straight line segments are arranged at intervals along the circumference of the hub, and the distance between the intersection points of the two second straight line segments extending to the outer contour line of the hub is L2, satisfying: L2≥3mm.

8. The wind wheel according to claim 1, characterized in that: On the projection plane perpendicular to the rotation axis of the wind wheel, the outer contour line of the first reinforcement rib includes a first arc segment and two first straight line segments connected to each other, the first arc segment is connected to the outer contour line of the hub, the two first straight line segments are arranged at intervals along the circumference of the hub, and the distance between the intersection points of the two first straight line segments extending to the outer contour line of the hub is L1, satisfying: L1≥3mm.

9. The wind wheel according to claim 1, characterized in that: A plurality of ribs are arranged on the inner side of the thinning portion, and the plurality of ribs are arranged in a mesh structure.

10. The wind wheel according to claim 9, characterized in that: The plurality of ribs include a plurality of first ribs and a plurality of second ribs, the plurality of first ribs are spaced apart along a first direction, the plurality of second ribs are spaced apart along a second direction and connected to the first ribs, and the first direction and the second direction are arranged at an angle.

11. The wind wheel according to claim 9, characterized in that: A plurality of convex portions are provided on the inner side of the thinned portion in the gap region between the adjacent ribs.

12. The wind wheel according to claim 11, characterized in that: On a projection plane perpendicular to the rotation axis of the wind wheel, the maximum length of the convex portion is D, satisfying: 2mm≤D≤20mm.

13. The wind wheel according to claim 11 or 12, characterized in that: The maximum height of the protrusion protruding from the thinning portion is H1, and the maximum height of the rib protruding from the thinning portion is H2, satisfying: H1≥0.5mm, H1≤H2.

14. An air conditioner, characterized in that: The invention comprises a wind wheel as claimed in any one of claims 1 to 13.

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