Blade and grating assembly

Abstract

The invention discloses a blade and a grille assembly. The contour line of the blade-shaped section of the blade comprises a first line segment which is an arc line, and the two end points of the first line segment are a point A and a point B which are distributed up and down; the second line segment and the first line segment are located at the two ends of the grating assembly in the thickness direction correspondingly, and the two end points of the second line segment are a point F and a point E which are distributed up and down; the windward section is connected between the point A and the point F, and comprises a first windward section which is smoothly connected with the point A; the leeward section is connected between the point B and the point E, and the leeward section comprises a first leeward section which is smoothly connected with the point B; the curvature center of the first windward section is located on the leeward side of the blade. The curvature center of the first leeward section is located on the windward side of the blade. And the thickness L of the blade-shaped section in the height direction is gradually reduced from the middle position of the blade in the thickness direction of the grating assembly to the direction close to the second line segment. The grille assembly is applied to the wall close to the air conditioner outdoor unit, and airflow short circuit at the air conditioner outdoor unit can be effectively restrained.

Description

Technical Field

[0001] This application relates to the field of air circulation technology, and more particularly to a blade and grille assembly. Background Technology

[0002] Air conditioner outdoor units are typically installed on the exterior walls of buildings. In some installation scenarios, there is pre-installed space on the exterior walls of the building for the outdoor unit.

[0003] To ensure the building's overall aesthetics, grille components are installed on the exterior walls to conceal the outdoor air conditioning units. Both the exhaust and return air from the outdoor units circulates with the atmosphere through these grille components.

[0004] However, in actual use, the airflow blown out by the outdoor unit of the air conditioner is prone to short-circuiting when it flows through the blades of the grille assembly. That is, the blown airflow is sucked back by the outdoor unit. In extreme high / low temperature weather, the short-circuiting phenomenon can cause the air conditioner to shut down frequently, affecting the user experience. Summary of the Invention

[0005] This application provides a blade and grille assembly that can effectively suppress airflow short-circuiting.

[0006] In one aspect of this application, a blade comprises:

[0007] The plane orthogonal to the length direction of the blade is surface W, and the cross-section of the blade intercepted by surface W is the blade-shaped cross-section. The outline of the blade-shaped cross-section includes:

[0008] The first line segment is an arc, and the two endpoints of the first line segment are point A and point B located below point A, respectively.

[0009] The second line segment is located at both ends of the blade thickness direction, which is the same as the first line segment. The length of the second line segment is less than that of the first line segment. The two endpoints of the second line segment are point F and point E located below point F, respectively.

[0010] A windward segment, having at least one curved section, connecting point A and point F, comprising:

[0011] The first windward section is smoothly connected to point A;

[0012] A leeward section, having at least one curved segment, connecting point B and point E, the leeward section comprising:

[0013] The first leeward section is smoothly connected to point B;

[0014] Wherein, the center of curvature of the first windward section is located on the leeward side of the blade; the center of curvature of the first leeward section is located on the windward side of the blade.

[0015] Along the air outlet direction, from the middle position to the second line segment of the blade, the thickness L of the airfoil section gradually decreases.

[0016] In this application, the contour line of the airfoil section has an arc-shaped first line segment, a first windward section and a first leeward section that are smoothly connected to the first line segment. The shape formed by the first line segment, the part of the first windward section close to the first line segment, and the part of the first leeward section close to the first line segment is similar to the head of a fish; the part where the thickness L of the airfoil section gradually decreases is similar to the tail of a fish. Therefore, the airfoil section is similar to a fish shape. By using the low-resistance streamline shape of the fish-shaped bionic feature, the wind resistance of the blade can be reduced. When the grille assembly is applied to the outside of the air conditioner outdoor unit, due to the reduction of the wind resistance at the blade, the smoothness of the air flow passing through the blade of the air conditioner outdoor unit for air intake and exhaust can be improved, and the air flow of the air conditioner outdoor unit can be blown farther, avoiding the occurrence of air flow short circuit, and thus the performance of the air conditioner outdoor unit can be improved.

[0017] In some embodiments, the windward section further includes: a second windward section connected between the first windward section and the second line segment. The connection point of the second windward section and the first windward section is point G, and the center of curvature of the second windward section is located on the leeward side of the blade;

[0018] The leeward section further includes: a second leeward section connected to the first leeward section. The connection point of the second leeward section and the first leeward section is point C, and the center of curvature of the second leeward section is located on the leeward side of the blade; a third leeward section connected between the second leeward section and the second line segment. The connection point of the third leeward section and the second leeward section is point D, and the center of curvature of the third leeward section is located on the leeward side of the blade;

[0019] Taking the straight line Q passing through any point on the first line segment and parallel to the height direction as a reference, from the point that is farther from the straight line Q between point H and point C towards the direction close to the second line segment, the thickness L of the airfoil section in the height direction gradually decreases.

[0020] In some embodiments, the curve in the contour line is an arc, and the radius of the arc satisfies: R(AB) < R(BC), R(AB) < R(AG); R(AG) < R(GF), R(BC) < R(DE).

[0021] R(AB) < R(BC), R(AB) < R(AG). The radius R(AB) of the first line segment is smaller than the radius R(BC) of the first leeward section and the radius R(AG) of the first windward section connected to it, making the first line segment a relatively pointed end with a small area, which can reduce the blockage of the air flow. The first line segment is also an arc surface, which is beneficial to guiding the flow of the air flow.

[0022] R(AG) < R(GF), R(BC) < R(DE). The radius of the part of the blade near the second line segment is greater than that of the part near the first line segment. The curve of the blade head bulges smoothly, which can reduce the pressure loss and increase the smoothness of the airflow along the blade surface. The curve of the blade tail is gentler, which can make the airflow blow farther, thereby further improving the aerodynamic resistance of the blade and increasing the air supply distance.

[0023] In some embodiments, the length of the windward section is less than that of the leeward section. The length of the leeward section is longer, and the degree of depression of the second leeward section and the third leeward section is larger. The air airflow flows more closely to the windward side of the blade, which can further increase the smoothness of the airflow.

[0024] In some embodiments, the windward section includes: a second windward section connected to the first windward section. The connection point of the second windward section and the first windward section is point G, and the center of curvature of the second windward section is located on the leeward side of the blade; a third windward section connected between the second windward section and the second line segment, and the center of curvature of the third windward section is located on the windward side of the blade.

[0025] The leeward section includes: a second leeward section connected to the first leeward section. The connection point of the second leeward section and the first leeward section is point C, and the center of curvature of the second leeward section is located on the leeward side of the blade; a third leeward section connected between the second leeward section and the second line segment, and the center of curvature of the third leeward section is located on the windward side of the blade.

[0026] Taking the straight line Q passing through any point on the first line segment and parallel to the height direction as a reference, from the point farther from the straight line Q between point G and point C towards the direction close to the second line segment, the thickness L of the airfoil section in the height direction gradually decreases.

[0027] In some embodiments, the length of the windward section is L1, and the length of the leeward section is L2, where L1 = (0.8 - 1.2)L2.

[0028] In this application, L1 and L2 are relatively close, which can ensure that the windward section and the leeward section are gentler at the tail, facilitating the smooth outflow of the airflow from the tail of the blade, thereby making the airflow blow farther.

[0029] In some embodiments, the central angle of the first line segment is 90° - 120°. In this application, when the central angle of the first line segment is within this range, it can improve the oncoming flow impact and reduce the resistance of the blade to the airflow.

[0030] In some embodiments, the length of the windward section is L1, and the length of the leeward section is L2; the magnitude of the central angle of the first line segment is inversely correlated with the value of L1 / L2. This can ensure that within the range of the central angle value of the first line segment, the shape of the blade changes little generally.

[0031] In some embodiments, one end of the blade near the second segment is serrated along the length of the blade. When the airflow exits the serrated end, it is dispersed by the serrations, which facilitates the rapid diffusion of the airflow and prevents the airflow from accumulating at the blade.

[0032] In some embodiments, with reference to a straight line P that passes through point A and is parallel to the thickness direction of the grille assembly, the first windward segment is located above the straight line P.

[0033] In this application, the upper side of the blade head is raised, which helps to reduce pressure loss and increase the smoothness of airflow along the surface of the blade 20.

[0034] In another aspect of this application, a grid assembly is also provided, including a frame and the aforementioned blades arranged in the frame in a manner that runs along the height direction of the frame.

[0035] In this application, when the grille assembly is applied to the outside of the air conditioner outdoor unit, the reduced wind resistance at the blades can improve the smoothness of the airflow passing through the blades, and also allow the airflow of the air conditioner outdoor unit to be blown further, avoiding airflow short circuits, thereby improving the performance of the air conditioner outdoor unit. Attached Figure Description

[0036] Figure 1 A side sectional view of a grille assembly in use according to some embodiments is shown;

[0037] Figure 2 A perspective view of a grille assembly according to some embodiments is shown;

[0038] Figure 3 A side sectional view of a grille assembly according to some embodiments is shown;

[0039] Figure 4 A side sectional view of a blade in a grille assembly according to some embodiments is shown;

[0040] Figure 5 A side sectional view of a grille assembly according to some other embodiments is shown;

[0041] Figure 6 A side sectional view of a blade in a grille assembly according to some other embodiments is shown;

[0042] Figure 7 A top view of a blade in a grille assembly according to some embodiments is shown;

[0043] Figure 8(a) is a simulation cloud map of the entire unit of the outdoor air conditioner using straight blades in the existing technology.

[0044] Figure 8(b) is a simulation cloud diagram of the entire unit of the outdoor air conditioner using the blades of Embodiment 1 on the outside;

[0045] Figure 8(c) is a simulation cloud diagram of the entire unit of the outdoor air conditioner using the blades of Example 2 on the outside;

[0046] Figure 9(a) is a simulated cloud map of the airflow during inter-blade return of a prior art grid assembly;

[0047] Figure 9(b) is a simulation cloud map of the airflow during air return between the blades in Embodiment 1 of the grille assembly of this application;

[0048] Figure 9(c) is a simulation cloud map of the airflow during air return between the blades in Embodiment 2 of the grille assembly of this application;

[0049] Figure 10(a) is a simulation cloud map of the airflow when air is discharged between the blades of the prior art grille assembly;

[0050] Figure 10(b) is a simulation cloud map of the airflow when air is discharged between the blades in Embodiment 1 of the grille assembly of this application;

[0051] Figure 10(c) is a simulation cloud map of the airflow when air is discharged between the blades in Embodiment 2 of the grille assembly of this application.

[0052] In the above figures, 1. Grille assembly; 10. Frame; 11. Horizontal beam; 12. Vertical beam; 20. Blade; 21. First line segment; 22. Second line segment; 23. Windward section; 231. First windward section; 232. Second windward section; 233. Third windward section; 24. Leeward section; 241. First leeward section; 242. Second leeward section; 243. Third leeward section; 2. Air conditioner outdoor unit; 3. Building; 301. Reserved space. Detailed Implementation

[0053] To make the objectives and implementation methods of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the exemplary embodiments described are only some embodiments of this application, and not all embodiments.

[0054] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0055] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0056] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0057] Reference Figure 1 In the diagram, the arrows at the front indicate the direction of the airflow from the outdoor unit of the air conditioner, and the arrows at the back indicate the direction of the return airflow. In one application scenario, the grille assembly 1 forms part of the exterior wall of building 3. Building 3 has a reserved space 301, within which the outdoor unit 2 of the air conditioner is installed. The grille assembly 1 is connected to the exterior wall to enclose the reserved space 301, achieving a concealed installation of the outdoor unit 2. The airflow from the outdoor unit passes through the grille assembly 1 and exits to the outside of the reserved space 301.

[0058] Reference Figure 2 The grille assembly 1 includes a frame 10. The frame 10 includes two horizontal beams 11 spaced apart vertically, and vertical beams 12 connected to the two ends of the two horizontal beams. The two horizontal beams 11 and the two vertical beams 12 form a rectangular frame.

[0059] The frame 10 can be connected to the exterior wall using fasteners such as bolts. Alternatively, the frame 10 can be clipped onto the exterior wall.

[0060] The grille assembly 1 includes blades 20. Multiple blades 20 are arranged within the frame 10 in a manner that follows the height direction of the grille assembly 1. The height direction of the grille assembly 1 is also the height direction of the frame 10.

[0061] The blade 20 is long and narrow, and its two ends along its length are connected to the vertical beam 12 of the frame 10.

[0062] The frame 10 and blades 20 can be made of metal materials such as aluminum alloy or galvanized steel. The crossbeam 11 and the vertical beam 12, and the blades 20 and the frame 10 can be connected by fasteners such as screws, or by direct welding.

[0063] The frame 10 and blades 20 can also be made of non-metallic materials such as aging-resistant PVC and resin. The frame 10 and blades 20 can be integrally injection molded, or they can be connected by fasteners such as screws.

[0064] The frame 10 and the blade 20 can also be made of different materials. For example, the frame 10 can be made of metal and the blade 20 can be made of non-metal.

[0065] Reference Figures 3 to 6 The cross section of blade 20 orthogonal to its length direction is called the blade-shaped cross section. Specifically, surface W is orthogonal to the length direction of blade 20, and the cross section of blade 20 intercepted by surface W is the blade-shaped cross section. The outline of the blade-shaped cross section includes a first line segment 21. The first line segment 21 is an arc, and its two endpoints are points A and B, respectively.

[0066] The outline includes the second line segment 22. The second line segment 22 can be an arc or a straight line, and its two endpoints are point E and point F, respectively.

[0067] The first line segment 21 and the second line segment 22 are located at the two ends of the width direction of the blade 20, which is also the thickness direction of the grille assembly 1 or the frame 10. In the height direction, point A is above point B, and point F is above point E.

[0068] For ease of description, in this application, the end of the blade 20 where the first line segment 21 is located is called the head end of the blade 20, and the end where the second line segment 22 is located is called the tail end of the blade 20; the part of the blade 20 near the head end is called the head, and the part of the blade 20 near the tail end is called the tail.

[0069] The length of the first line segment 21 is greater than the length of the second line segment 22, so as to form a shape that is large at the head and small at the tail.

[0070] The profile includes the windward section 23. The windward section 23 connects point A of the first line segment 21 and point F of the second line segment 22. The windward section 23 is the profile of the windward surface of the blade 20.

[0071] The windward segment 23 includes at least one curve, and the curve in the windward segment 23 that is smoothly connected to point A is the first windward segment 231.

[0072] The outline includes a leeward segment 24. The leeward segment 24 connects point B of the first line segment 21 and point E of the second line segment 22. The leeward segment 24 is the outline of the leeward side of the blade 20.

[0073] The leeward segment 24 includes at least one curve, and the curve in the leeward segment 24 that is smoothly connected to point B is the first leeward segment 241. One end of the first leeward segment 241 is connected to point B, and the other end of the first leeward segment 241 is point C.

[0074] The curvature center of the windward section 23 is located on the leeward side of the blade 20, while the curvature center of the leeward section 24 is located on the windward side of the blade 20.

[0075] It should be noted that, in the height direction of the grille assembly 1, the upper side of the windward section 23 is the windward side of the blade 20, and the lower side of the leeward section 24 is the leeward side of the blade 20.

[0076] From the middle position of the blade 20 in the width direction towards the direction closer to the second line segment 22, the thickness L of the blade section in the height direction gradually decreases.

[0077] In this application, the shape formed by the first line segment 21, the part of the first windward section 231 near the first line segment 21, and the first leeward section 241 is similar to the head of a fish. The part of the blade cross section where the thickness L gradually decreases is similar to the tail of a fish. Therefore, the blade cross section is similar to the shape of a fish. This application uses the low-resistance streamlined shape with fish-shaped biomimetic features to reduce the wind resistance of the blade 20.

[0078] When the grille assembly is applied to the outside of the outdoor unit of an air conditioner, if the wind resistance at the blades is high, it is easy for the airflow blown out by the outdoor unit to be short-circuited and drawn back by the outdoor unit.

[0079] The present application improves the smoothness of airflow through the blades 20 by reducing wind resistance at the blades 20, and also allows the airflow of the air conditioner outdoor unit to be blown further, avoiding airflow short circuit and thus improving the performance of the air conditioner outdoor unit.

[0080] (Example 1 of blade 20)

[0081] In some embodiments, refer to Figure 3 and Figure 4 The windward section 23 includes a second windward section 232 connecting the first windward section 231 and the second line segment 22. One end of the second windward section 232 is connected to point G of the first windward section 231, and the other end of the second windward section 232 is connected to point F of the second line segment 22. The center of curvature of the second windward section 232 is located on the leeward side of the blade 20.

[0082] The leeward section 24 includes a second leeward section 242 and a third leeward section 243 connected sequentially between the first leeward section 241 and the second line segment 22.

[0083] The point connecting the second leeward section 242 and the first leeward section 241 is point C, and the point connecting the second leeward section 242 and the third leeward section 243 is point D.

[0084] The center of curvature of the second leeward section 242 is located on the leeward side of the blade 20, and the center of curvature of the third leeward section 243 is located on the leeward side of the blade 20.

[0085] Taking the straight line Q passing through any point on the first line segment 21 and parallel to the height direction as a reference, in the direction of the point C and the point G that is farther from the straight line Q approaching the second line segment 22, the thickness L of the airfoil section in the height direction gradually decreases.

[0086] According to an embodiment of the present application, in the width direction of the blade 20, the distance from the point G to the head end of the blade 20 is greater than the distance from the point C to the head end of the blade 20. The distance from the point D to the head end of the blade 20 is greater than the distance from the point G to the head end of the blade 20. In the height direction of the blade 20, the height of the point D is higher than that of the point C.

[0087] In the direction from the point G approaching the second line segment 22, the thickness L of the airfoil section in the height direction gradually decreases.

[0088] According to an embodiment of the present application, the curves of the windward section 23 and the leeward section 24 are both arcs. The radius of the first line segment 21 is R(AB), the radius of the first leeward section 241 is R(BC), the radius of the second leeward section 242 is R(CD), the radius of the third leeward section 243 is R(DE), the radius of the first windward section 231 is R(AG), and the radius of the second windward section 23 is R(GF). Then R(AB) < R(BC) < R(AG) < R(DE) < R(GF) < R(CD).

[0089] Among them, R(AB) < R(BC), R(AB) < R(AG). The radius R(AB) of the first line segment 21 is smaller than the radius R(BC) of the first leeward section 241 and the radius R(AG) of the first windward section 231 connected thereto, making the first line segment 21 a relatively pointed end with a small area, which can reduce the blockage of the air flow. The first line segment 21 is also an arc surface, which is beneficial to guiding the flow of the air flow.

[0090] Among them, R(AG) < R(GF), R(BC) < R(DE). The radius of the part of the blade 20 close to the second line segment 22 is larger than the radius of the part close to the first line segment 21. The curve of the head of the blade 20 is smoothly bulged, which can reduce the pressure loss and increase the smooth flow of the air flow along the surface of the blade 20; the curve of the tail of the blade 20 is flatter, which can make the air flow blow farther, thereby further improving the aerodynamic resistance of the blade 20 and increasing the air supply distance.

[0091] According to an embodiment of this application, the length of the windward section 23 is L1, and the length of the leeward section 24 is L2, where L2 > L1. The longer the leeward section 24, the greater the indentation of the second leeward section 242 and the third leeward section 243, allowing the airflow to flow closer to the windward side of the blade 20, which can further increase the stability of the airflow.

[0092] (Example 2 of blade 20)

[0093] In some embodiments, refer to Figure 5 and Figure 6 The windward section 23 includes a second windward section 232 and a third windward section 233 connected sequentially between the first windward section 231 and the second line segment 22. The connection point between the second windward section 232 and the first windward section 231 is point G, and the connection point between the second windward section 232 and the third windward section 233 is point H. The center of curvature of the second windward section 232 is located on the leeward side of the blade 20, and the center of curvature of the third windward section 233 is located on the windward side of the blade 20.

[0094] The leeward section 24 is wavy and includes a second leeward section 242 and a third leeward section 243 connected sequentially between the first leeward section 241 and the second line segment 22. The point connecting the second leeward section 242 and the first leeward section 241 is point C, and the point connecting the second leeward section 242 and the third leeward section 243 is point D. The center of curvature of the second leeward section 242 is located on the leeward side of the blade 20, and the center of curvature of the third leeward section 243 is located on the windward side of the blade 20.

[0095] In this embodiment, the tail end of the blade 20 is different from that in the previous embodiment. In this embodiment, the tail end of the blade 20 is curved upwards, which is equivalent to the previous embodiment.

[0096] Taking a straight line Q that passes through any point on the first line segment 21 and is parallel to the height direction as a reference, the thickness L of the blade section in the height direction gradually decreases towards the direction of the second line segment 22, between the points C and G that are farther away from the straight line Q.

[0097] In this embodiment, the distance from point G to line Q is greater than the distance from point C to line Q. Therefore, from point G towards the direction closer to the second line segment 22, the thickness L of the blade section in the height direction gradually decreases.

[0098] In some embodiments, the curves of the windward section 23 and the leeward section 24 are both arcs. The radius of the first line segment 21 is R(AB), the radius of the first leeward section 241 is R(BC), the radius of the second leeward section 242 is R(CD), the radius of the third leeward section 243 is R(DE), the radius of the first windward section 231 is R(AG), the radius of the second windward section 232 is R(HG), and the radius of the third windward section is R(HF). Then R(AB) < R(BC) < R(AG) < R(HF) < R(DE) < R(HG) < R(CD).

[0099] Among them, R(AB) < R(BC) and R(AB) < R(AG). The radius R(AB) of the first line segment 21 is smaller than the radius R(BC) of the first leeward section 241 and the radius R(AG) of the first windward section 231 connected thereto, making the first line segment 21 a relatively sharp end with a small area, which can reduce the blockage of the air flow. The first line segment 21 is also an arc surface, which is beneficial to guiding the flow of the air flow.

[0100] Among them, R(AG) < R(HF) and R(BC) < R(DE). The radius of the tail of the blade 20 is greater than the radius of its head. The curve of the head of the blade 20 is smoothly raised, which can reduce the pressure loss and increase the smoothness of the air flow along the surface of the blade 20; the curve of the tail of the blade 20 is flatter, which can make the air flow blow farther, thereby further improving the aerodynamic resistance of the blade 20 and increasing the air supply distance.

[0101] According to the second embodiment of the present application, the length of the windward section 23 is L1, and the length of the leeward section 24 is L2, and L1 = (0.8 - 1.2)L2. This can make the lengths of the windward section 23 and the leeward section 24 relatively close. On the premise of ensuring the head shape of the blade 20, if L1 and L2 differ greatly, then the tail of the windward section 23 or the leeward section 24 needs to be more curved to adapt to the change in length. For example, when L1 is larger, the tail of the windward section 23 needs to be more curved to obtain a larger length, and when L2 is larger, the tail of the leeward section 24 needs to be more curved to obtain a larger length.

[0102] L1 and L2 are relatively close, which can ensure that the windward section 23 and the leeward section 24 are flatter at the tail, which is beneficial to the smooth outflow of the air flow from the tail of the blade 20, so that the air flow blows farther.

[0103] In the above two embodiments, the central angle of the first line segment 21 can be 90° - 120°. The central angle of the first line segment 21 within this range can improve the oncoming flow impact and reduce the resistance of the blade 20.

[0104] In some embodiments, the central angle of the first line segment 21 is inversely correlated with the value of L1 / L2. That is, the central angle of the first line segment 21 increases as the value of L1 / L2 decreases. This ensures that the shape of the blade 20 remains largely unchanged within the range of the central angle of the first line segment 21.

[0105] In some embodiments, refer to Figure 7 The end (tail end) of the blade 20 containing the second line segment 22 is serrated along its length. When the airflow exits the serrated end, it is dispersed by the serrations, which facilitates the rapid diffusion of the airflow and prevents the airflow from accumulating at the blade 20.

[0106] In the current example, the edges of the serrations are straight line segments, presenting a triangular shape. The tooth pitch is 6–24 mm, the tooth width is 1.5–6 mm, and the tooth angle is 20–60°. As the tooth pitch increases, the tooth width and tooth angle increase accordingly. In other embodiments, the edges of the serrations may also be wavy.

[0107] Reference Figures 3 to 6 The blade 20 is positioned on the frame 10 with reference to the height direction of the grille assembly 1, with the windward side of the blade 20 located above its leeward side.

[0108] With reference to the straight line P that passes through point A and is parallel to the thickness direction of the grid assembly 1, the first windward section 231 is located on the upper side of the straight line P.

[0109] The upper side of the blade 20 head is raised, which helps to reduce pressure loss and increase the smoothness of airflow along the surface of the blade 20.

[0110] This application compares and simulates the use of straight blades in the prior art, the blades of Embodiment 1, and the blades of Embodiment 2 on the outer side of the outdoor unit of an air conditioner, and obtains the following data:

[0111]

[0112]

[0113] As can be seen from the table above, under the same fan speed, after the grille assembly adopts the blades of Embodiment 1 and Embodiment 2, the overall air volume is improved compared with the existing technology, the aerodynamic resistance of the grille assembly is reduced, and the air delivery distance of the outdoor unit is improved.

[0114] This application optimizes the shape of the blade 20, which not only improves the aerodynamic resistance of the grille assembly 1 and optimizes the air volume of the whole unit under the design conditions, but also significantly increases the air delivery distance and avoids airflow short circuit of the outdoor unit of the air conditioner.

[0115] Figure 8(a) is a simulation cloud diagram of the air conditioner outdoor unit with straight blades in the prior art on the outside; Figure 8(b) is a simulation cloud diagram of the air conditioner outdoor unit with blades in Embodiment 1 on the outside; and Figure 8(c) is a simulation cloud diagram of the air conditioner outdoor unit with blades in Embodiment 2 on the outside.

[0116] The simulation results in Figure 8 show that the grid assembly 1 of this application can significantly improve the air delivery distance (limited to a wind speed of 1 m / s), which is at least 50% higher than the prior art.

[0117] Figure 9(a) is a simulation cloud diagram of the airflow during air return between the blades of a prior art grille assembly; Figure 9(b) is a simulation cloud diagram of the airflow during air return between the blades of a first embodiment of the grille assembly of this application; Figure 9(c) is a simulation cloud diagram of the airflow during air return between the blades of a second embodiment of the grille assembly of this application. Figure 10(a) is a simulation cloud diagram of the airflow during air outlet between the blades of a prior art grille assembly; Figure 10(b) is a simulation cloud diagram of the airflow during air outlet between the blades of a first embodiment of the grille assembly of this application; Figure 10(c) is a simulation cloud diagram of the airflow during air outlet between the blades of a second embodiment of the grille assembly of this application.

[0118] The simulation results in Figures 9 and 10 show that, compared with the prior art, the airflow at the blade outlet and return is more uniform, effectively reducing resistance and increasing air volume.

[0119] As described above, according to the embodiments of this application, the outline of the blade 20 has an arc-shaped first line segment 21, a first windward section 231 and a first leeward section 241 smoothly connected to the first line segment 21, the portion of the first line segment 21 and the portion of the first windward section 231 near the tip of the blade 20, and the shape formed by the first leeward section 241 resembles the head of a fish; from the middle position of the blade towards the direction near the second line segment 22, the thickness L of the blade cross section gradually decreases in the height direction, and the portion of the blade cross section where the thickness L gradually decreases resembles the tail of a fish. Therefore, the blade cross section resembles a fish shape, and by utilizing the low-resistance streamlined shape with fish-shaped biomimetic features, the wind resistance of the blade 20 can be reduced. When the grille assembly is applied to the outside of the air conditioner outdoor unit, due to the reduction of wind resistance at the blade 20, the smoothness of the airflow passing through the blade 20 of the air conditioner outdoor unit can be improved, and the airflow of the air conditioner outdoor unit can be blown further, avoiding airflow short-circuiting, thereby improving the performance of the air conditioner outdoor unit.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0121] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. A vane, characterized in that Comprise: The plane orthogonal to the length direction of the blade is plane W, the cross section of the blade intersected by plane W is a blade profile cross section, the profile line of the blade profile cross section comprises: A first line segment which is an arc, two end points of the first line segment are point A and point B located at the lower side of point A respectively; A second line segment which is located at both ends of the first line segment in the thickness direction of the blade, the length of the second line segment is smaller than that of the first line segment, two end points of the second line segment are point F and point E located at the lower side of point F respectively; An upwind section having at least one curve, the upwind section is connected between point A and point F, the upwind section comprises: A first upwind section which is smoothly connected with point A; A leeward section having at least one curve, the leeward section is connected between point B and point E, the leeward section comprises: A first leeward section which is smoothly connected with point B; Wherein, the curvature center of the first upwind section is located at the leeward side of the blade; the curvature center of the first leeward section is located at the upwind side of the blade; In the outflow direction, the thickness L of the blade profile cross section gradually decreases from the middle position to the second line segment.

2. The grating assembly of claim 1, wherein, The upwind section further comprises: A second upwind section connected between the first upwind section and the second line segment, the connection point of the second upwind section and the first upwind section is point G, the curvature center of the second upwind section is located at the leeward side of the blade; The leeward section further comprises: A second leeward section connected with the first leeward section, the connection point of the second leeward section and the first leeward section is point C, the curvature center of the second leeward section is located at the leeward side of the blade; A third leeward section connected between the second leeward section and the second line segment, the connection point of the third leeward section and the second leeward section is point D, the curvature center of the third leeward section is located at the leeward side of the blade; With respect to a straight line Q passing through any point of the first line segment and parallel to the height direction, the thickness L of the blade profile cross section in the height direction gradually decreases in the direction close to the second line segment from the point which is farther away from the straight line Q among the two points of point G and point C.

3. The grating assembly of claim 2, wherein, The curve in the profile line is an arc, the radius of the arc satisfies: R(AB)< R(BC), R(AB)< R(AG); R(AG)< R(GF), R(BC)< R(DE).

4. The grating assembly of claim 1, wherein, The upwind section further comprises: A second upwind section connected with the first upwind section, the connection point of the second upwind section and the first upwind section is point G, the curvature center of the second upwind section is located at the leeward side of the blade; A third upwind section connected between the second upwind section and the second line segment, the curvature center of the third upwind section is located at the upwind side of the blade; The leeward section further comprises: A second leeward section connected with the first leeward section, the connection point of the second leeward section and the first leeward section is point C, the curvature center of the second leeward section is located at the leeward side of the blade; A third leeward section connected between the second leeward section and the second line segment, the curvature center of the third leeward section is located at the upwind side of the blade; A straight line Q parallel to the height direction and passing through any point on the first line segment is taken as a reference, and the thickness L of the blade profile section in the height direction gradually decreases from the point G and the point C, whichever is farther from the straight line Q, to the direction close to the second line segment.

5. The grating assembly of claim 4, wherein, The length of the windward segment is L1, and the length of the leeward segment is L2, L1=(0.8~1.2)L2.

6. The grating assembly of claim 1, wherein, The central angle of the first line segment is 90°~120°.

7. The grating assembly of claim 6, wherein, The length of the windward segment is L1, and the length of the leeward segment is L2; The central angle of the first line segment is inversely related to the value of L1 / L2.

8. The grating assembly of claim 1, wherein, An end of the blade close to the second line segment is serrated along the length direction of the blade.

9. The grating assembly of claim 1, wherein, A straight line P passing through the point A and parallel to the thickness direction of the grille assembly is taken as a reference, and the first windward segment is located on the upper side of the straight line P.

10. A grating assembly characterized by, Comprise: A frame body; A plurality of blades as claimed in any one of claims 1-9 are arranged in the frame body in the height direction of the frame body.

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