Air guide ring, axial flow fan and air conditioner

Abstract

The utility model discloses an air guide ring, an axial flow fan and an air conditioner, and relates to the technical field of air handling devices, the air guide ring is provided with an inner cavity molded line which is annularly arranged, the inner cavity molded line comprises a first arc line section and a second arc line section which are adjacent, and the curvature of the first arc line section is different from that of the second arc line section. According to the technical scheme, the molded line of the inner cavity of the wind guide ring is arranged and comprises the two arc sections with different curvatures, so that the blade top gap between the wind guide ring and the wind wheel is variable on the same circumference of the wind guide ring, namely, the distance of the blade top of the wind wheel extending to the inner wall surface of the wind guide ring in the radial direction is fluctuant, and the blade top of the wind wheel is changed. Due to the fact that the blade top gaps are variable, when the wind wheel rotates and airflow passes through the wind guide ring, different flowing conditions can be experienced, the original stable airflow mode can be destroyed through the change, vortex noise generated when the blades pass through the wind guide ring is restrained, and the noise is reduced by reducing or disturbing the resonance effect of a noise source.

Description

Technical Field

[0001] The utility model relates to the technical field of air treatment devices, and particularly relates to a wind guide ring, an axial flow fan and an air conditioner. Background Art

[0002] In the related art, the wind guide ring of an axial flow fan generally has two wind guide sections along the direction of air flow. One of the wind guide sections is in a straight cylinder shape, and the other is approximately in a horn shape. Since the straight cylinder section covers a relatively large axial area of the impeller, when the impeller rotates in the wind guide ring, the air flow enters from the arc section, and relatively large flow separation (boundary layer development, flat plate flow principle) will occur when passing through the straight section of the wind guide ring. Moreover, the flow separation becomes more obvious as the straight length of the wind guide ring increases, resulting in an increase in the flow resistance and eddy current noise around the wind guide ring. Content of the Utility Model

[0003] The main object of the utility model is to propose a wind guide ring, an axial flow fan and an air conditioner, aiming to reduce the eddy current noise of the fan.

[0004] To achieve the above object, the wind guide ring proposed by the utility model has an inner cavity profile arranged in a ring shape. The inner cavity profile includes adjacent first arc segments and second arc segments, and the curvatures of the first arc segment and the second arc segment are different.

[0005] In one embodiment, the curvature radii of the first arc segment and the second arc segment are not equal;

[0006] And / or, the positions of the curvature action points of the first arc segment and the second arc segment are different.

[0007] In one embodiment, the inner cavity profile includes multiple first arc segments and multiple second arc segments, and the multiple first arc segments and the multiple second arc segments are alternately arranged in sequence along the circumferential direction of the wind guide ring.

[0008] In one embodiment, the inner wall surface of the wind guide ring includes a first curved surface section and a second curved surface section. The first curved surface section corresponds to the first arc segment, and the second curved surface section corresponds to the second arc segment. The first curved surface section is a concave surface, and the second curved surface section is a convex surface.

[0009] In one embodiment, the wind guide ring has a first end and a second end opposite to each other along its axis. The inner wall surface of the wind guide ring has a reference line parallel to the central axis of the wind guide ring; the first curved surface section and the second curved surface section extend along the directions of the first end and the second end, and have a pointing line extending along the directions of the first end and the second end. The pointing line forms an angle with the reference line.

[0010] In one embodiment, the included angle between the pointing line and the reference line is not less than 15° and not greater than 45°.

[0011] The present utility model further provides an axial flow fan, which includes:

[0012] An impeller, and

[0013] A wind guiding ring as described in any of the foregoing embodiments, and the impeller is arranged inside the wind guiding ring.

[0014] In one embodiment, the radius of the impeller is R, and the wind guiding ring has an outer radius and an inner radius;

[0015] The minimum inner radius of the wind guiding ring is Rmin, and Rmin satisfies: Rmin > R + 5 mm;

[0016] The maximum outer radius of the wind guiding ring is Rmax, and Rmax satisfies: Rmax < 1.09R.

[0017] In one embodiment, the distance between the connection point of the first arc segment and the second arc segment and the central axis of the inner cavity profile line is Rmed;

[0018] Rmed satisfies: 0.4(Rmax + Rmin) ≤ Rmed ≤ 0.6(Rmax + Rmin).

[0019] In one embodiment, the outer contour profile line includes a third arc segment and a fourth arc segment, the third arc segment is arranged corresponding to the position of the first arc segment, and the fourth arc segment is arranged corresponding to the position of the second arc segment;

[0020] The radius of curvature of the first arc segment is R1, and R1 satisfies: 0.01R ≤ R1 ≤ 0.02R;

[0021] The radius of curvature of the second arc segment is R2, and R2 satisfies: 0.026R ≤ R2 ≤ 0.042R;

[0022] The radius of curvature of the third arc segment is R3, and R3 satisfies: 0.026R ≤ R3 ≤ 0.042R;

[0023] The radius of curvature of the fourth arc segment is R4, and R4 satisfies: 0.01R ≤ R4 ≤ 0.02R.

[0024] The present utility model further provides an air conditioner, which includes the axial flow fan as described in any of the foregoing embodiments; or, the air conditioner includes the wind guiding ring as described in any of the foregoing embodiments.

[0025] In one embodiment, the air conditioner includes an outdoor unit of the air conditioner, and the outdoor unit of the air conditioner includes:

[0026] A panel, the panel having opposite outer and inner sides, the air guide ring being provided on the panel and located on the inner side of the panel; and

[0027] A grille, provided on the panel and located on the outer side of the panel;

[0028] A through groove is formed at a position of the air guide ring corresponding to the first arc segment, the through groove extending along the air outlet direction of the air guide ring, a first air passing opening is provided at a position of the panel corresponding to the through groove, and a second air passing opening is provided at a position of the grille corresponding to the first air passing opening.

[0029] Through the setting of the inner cavity profile of the air guide ring in the technical solution of the present utility model, the inner cavity profile includes two arc segments with different curvatures. Thus, on the same circumference of the air guide ring, the tip clearance between the air guide ring and the wind wheel is variable, that is, the distance from the tip of the wind wheel blade extending radially to the inner wall surface of the air guide ring fluctuates. Since the tip clearance is variable, when the wind wheel rotates, the air flow passing through the air guide ring will experience different flow conditions. This change can disrupt the original stable air flow pattern and suppress the vortex noise generated when the blade passes through the air guide ring. By reducing or disrupting the resonance effect of the noise source, the overall noise level can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0031] Figure 1 It is a schematic structural diagram of an embodiment of the air guide ring provided by the present utility model;

[0032] Figure 2 For Figure 1 a side view;

[0033] Figure 3 For Figure 1 a sectional view;

[0034] Figure 4 For Figure 3 an enlarged view at A in;

[0035] Figure 5 For Figure 1 a schematic diagram of an embodiment of the inner cavity profile and the outer contour line of the air guide ring in;

[0036] Figure 6 For Figure 5 a partial enlarged view;

[0037] Figure 7 In the air conditioner provided by the present utility model, it is a schematic diagram of an embodiment of the front frame.

[0038] Figure 8 In the air conditioner provided by the present utility model, it is a schematic diagram of an embodiment of the grille.

[0039] Explanation of the reference numerals in the drawings:

[0040] 10, air deflector ring; 100, inner cavity profile; 101, first arc segment; 102, second arc segment; 200, outer contour profile; 301, third arc segment; 302, fourth arc segment; 300, inner wall surface; 301, first curved surface segment; 302, second curved surface segment; 11, first end; 12, second end; 13, pointing line; 14, reference line;

[0041] 20, panel; 21, first air passage; 22, panel body; 23, motor bracket;

[0042] 30, grille; 31, second air passage; 32, middle support member; 33, annular frame; 34, spoke; 35, air deflector bar.

[0043] The realization of the purpose, functional features and advantages of the present utility model will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Specific embodiments

[0044] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0045] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0046] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0047] The present utility model provides an air guide ring 10, which is applied to a fan and aims to reduce the eddy current noise of the fan.

[0048] Please refer to Figures 1 to 8 , in an embodiment of the present utility model, the air guide ring 10 has an inner cavity profile 100 arranged in a ring shape. The inner cavity profile 100 includes adjacent first arc segments 101 and second arc segments 102, and the curvatures of the first arc segments 101 and the second arc segments 102 are different.

[0049] Regarding the inner cavity profile 100, it refers to the line or contour used to describe the shape of the internal cavity of an object. In this embodiment, the air guide ring 10 is arranged in a cylindrical shape. It can be understood that taking the plane perpendicular to the central axis of the air guide ring 10 as an auxiliary plane, among the shapes intercepted by this plane at the air guide ring 10 (such as Figure 5 shown), where, during 3D drawing, through operations such as stretching, the three-dimensional structure of the air guide ring 10 can be finally formed, and the inner cavity profile 100 corresponds to the inner wall surface 300 of the air guide ring 10.

[0050] Among them, the inner cavity profile line 100 includes adjacent first arc segment 101 and second arc segment 102. The curvatures of the first arc segment 101 and the second arc segment 102 are different. The curvatures of the first arc segment 101 and the second arc segment 102 may include the radius of curvature and the point of action of the curvature. Thus, the different curvatures of the first arc segment 101 and the second arc segment 102 include the following situations: the radius of curvature of the first arc segment 101 and the second arc segment 102 may not be equal, but the positions of the points of action of the curvatures of the first arc segment 101 and the second arc segment 102 are the same; or, the radius of curvature of the first arc segment 101 and the second arc segment 102 are equal, but the positions of the points of action of the curvatures of the first arc segment 101 and the second arc segment 102 are different; or, the radius of curvature of the first arc segment 101 and the second arc segment 102 are not equal, and the positions of the points of action of the curvatures of the first arc segment 101 and the second arc segment 102 are different.

[0051] In this embodiment, the air guiding ring 10 is applied to a fan. The wind wheel and the air guiding ring 10 are generally coaxially arranged or approximately coaxially arranged. Since the inner cavity profile line 100 of the air guiding ring 10 is provided with at least two arc segments with different curvatures, thus, on the same circumferential of the air guiding ring 10, the tip clearance between the air guiding ring 10 and the wind wheel is variable, that is, the distance from the tip of the wind wheel extending radially to the inner wall surface 300 of the air guiding ring 10 is fluctuating. Since the tip clearance is variable, when the wind wheel rotates, the air flow passing through the air guiding ring 10 will experience different flow conditions. This change can disrupt the original stable air flow pattern and suppress the periodic noise (such as vortex noise and cutting noise) generated when the blade passes through the air guiding ring 10. By reducing or disrupting the resonance effect of the noise source, the overall noise level can be reduced.

[0052] The technical solution of the present utility model is through the setting of the inner cavity profile line 100 of the air guiding ring 10. The inner cavity profile line 100 includes two arc segments with different curvatures. Thus, on the same circumferential of the air guiding ring 10, the tip clearance between the air guiding ring 10 and the wind wheel is variable, that is, the distance from the tip of the wind wheel extending radially to the inner wall surface 300 of the air guiding ring 10 is fluctuating. Since the tip clearance is variable, when the wind wheel rotates, the air flow passing through the air guiding ring 10 will experience different flow conditions. This change can disrupt the original stable air flow pattern and suppress the vortex noise generated when the blade passes through the air guiding ring 10. By reducing or disrupting the resonance effect of the noise source, the overall noise level can be reduced.

[0053] In a preferred embodiment, the inner cavity profile 100 includes multiple segments of the first arc segments 101 and multiple segments of the second arc segments 102, and the multiple segments of the first arc segments 101 and the multiple segments of the second arc segments 102 are alternately arranged in sequence along the circumferential direction of the air guiding ring 10. Thus, in this embodiment, the arc segments with different curvatures are alternately arranged, which can break the periodic pattern of the air flow. When the air flow transitions between the arc segments with different curvatures, the area where eddies are formed can be effectively reduced, thereby reducing the turbulence and vortices in the air flow.

[0054] In a preferred embodiment, the inner wall surface 300 of the air guiding ring 10 includes a first curved surface segment 301 and a second curved surface segment 302. The first curved surface segment 301 is arranged corresponding to the first arc segment 101, and the second curved surface segment 302 is arranged corresponding to the second arc segment 102. The first curved surface segment 301 is a concave surface, and the second curved surface segment 302 is a convex surface.

[0055] In another exemplary embodiment, the curvature action point of the first arc segment 101 is located inside the air guiding ring 10, and the curvature action point of the second arc segment 102 is located outside the air guiding ring 10.

[0056] In an embodiment, the inner wall surface 300 of the air guiding ring 10 includes a first curved surface segment 301 and a second curved surface segment 302. The first curved surface segment 301 is arranged corresponding to the first arc segment 101, and the second curved surface segment 302 is arranged corresponding to the second arc segment 102. The first curved surface segment 301 is a concave surface, and the second curved surface segment 302 is a convex surface. Thus, the combination of the concave surface and the convex surface can further reduce the formation of eddies and noise, because the fluid will be guided more smoothly when passing through the concave surface, and the convex surface helps to smooth the flow of the fluid.

[0057] In an exemplary embodiment, the inner cavity profile 100 is arranged in a wavy shape. Further, the wave is a sine wave. Thus, before the air flow enters the rear section of the air guiding ring 10, it is first broken into small vortex flows. Due to the regular change of the inner cavity profile 100, the tip clearance changes regularly, which can further reduce the separation and eddies of the air flow, thereby reducing the noise.

[0058] In an embodiment, please refer to Figure 3 and Figure 4 , the air guiding ring 10 has a first end 11 and a second end 12 opposite to each other along its axial direction, and the inner wall surface 300 of the air guiding ring 10 has a reference line 14 parallel to the central axis of the air guiding ring 10; the first curved surface segment 301 and the second curved surface segment 302 extend along the direction of the first end 11 and the second end 12, and have a pointing line 13 extending along the direction of the first end 11 and the second end 12, and the pointing line 13 is arranged at an angle with the reference line 14.

[0059] According to the above, the inner cavity profile 100 refers to the line or contour used to describe the shape of the internal cavity of an object. In this embodiment, the air guide ring 10 is provided in a cylindrical shape. It can be understood that, taking the plane perpendicular to the central axis of the air guide ring 10 as the auxiliary plane, among the shapes intercepted by this plane at the air guide ring 10 (as shown in Figure 5 shown), where, during 3D drawing, through operations such as stretching, the three-dimensional structure of the air guide ring 10 can be finally formed, and the inner cavity profile 100 corresponds to the inner wall surface 300 of the air guide ring 10. Then, this guiding line 13 can be understood as the direction line of stretching during this 3D drawing.

[0060] In an exemplary embodiment, the installation of the wind blade has an installation angle, and the size of this angle depends on the installation angle of the blade, that is to say, the magnitude and deviation of this deviation angle are both equal to the installation angle of the wind blade.

[0061] Thus, in this embodiment, after the air flow performs work through the rotation of the wind wheel, its flow direction will not be parallel to the axis of the wind wheel, but there will be a certain angle. The air guide ring 10 can better adapt to the actual flow direction of the air flow, reduce unnecessary friction and vortex generation, thereby reducing energy loss and improving the working efficiency of the system. Secondly, when the air flow flows along a path with an angle, directly contacting the inner wall of the parallel air guide ring 10 may generate vortices and noise. By adjusting the angle between the guiding line 13 and the reference line 14, the air flow can flow more smoothly along the inner wall surface 300, thereby reducing the formation of vortices and the generation of noise. Further, by adjusting the angle between the guiding line 13 and the reference line 14, the outlet air direction of the fan applying the air guide ring 10 can be adjusted to a certain extent, so as to adapt to different fluid working conditions requirements, thereby improving the adaptability of the air guide ring 10 in different application scenarios.

[0062] Based on the previous embodiment, the angle between the guiding line 13 and the reference line 14 is not less than 15° and not greater than 45°. In this embodiment, the angle between the guiding line 13 and the reference line 14, within the range of 15° to 45°, helps to balance the contact between the air flow and the inner wall of the air guide ring 10 and reduce the noise generated by vortices.

[0063] This angle range can effectively guide the air flow, reduce the vortices and flow separation generated due to the deviation of the air flow direction, and ensure that the air flow is smoother when passing through the air guide ring 10.

[0064] Specifically, the value of the angle between the pointing line 13 and the reference line 14 includes, but is not limited to, 15°, 16°, 17°, 18°, 19°, 20°, 21°, 22°, 23°, 24°, 25°, 26°, 27°, 28°, 29°, 30°, 31°, 32°, 33°, 34°, 35°, 36°, 37°, 38°, 39°, 40°, 41°, 42°, 43°, 44° or 45°.

[0065] The present utility model also provides an axial flow fan, which includes a wind wheel and a guide vane ring 10. The wind wheel is arranged inside the guide vane ring 10. The specific structure of the guide vane ring 10 refers to the above-mentioned embodiments. Since this axial flow fan adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated one by one here.

[0066] In one embodiment, the guide vane ring 10 has an outer radius and an inner radius. Among them, the outer radius corresponds to the outer diameter of the guide vane ring 10, and the inner radius corresponds to the inner diameter.

[0067] In this embodiment, the specific values of Rmin and Rmax need to be determined in combination with specific applications and the size of the wind wheel. Among them, the radius of the wind wheel is R, and the minimum inner radius of the guide vane ring 10 is Rmin, and Rmin satisfies: Rmin > R + 5 mm; within this range, the requirements of safety regulations can be met, and the tip leakage flow can be reduced. It can be understood that the minimum inner radius can be understood as the shortest distance between the inner wall surface 300 of the guide vane ring 10 and its central axis. The maximum outer radius of the guide vane ring 10 is Rmax, and Rmax satisfies: Rmax < 1.09R. For example, Rmax can be 1.01R, 1.02R, 1.03R, 1.04R, 1.05R, 1.06R, 1.07R or 1.08R, etc.

[0068] In one embodiment, the distance between the connection point of the first arc segment 101 and the second arc segment 102 and the central axis of the inner cavity line 100 is Rmed; among them, Rmed satisfies: 0.4(Rmax + Rmin) ≤ Rmed ≤ 0.6(Rmax + Rmin). In this embodiment, Rmed is limited to 0.4(Rmax + Rmin) ≤ Rmed ≤ 0.6(Rmax + Rmin), so that the difference in the relative length and amplitude between the first arc segment 101 and the second arc segment 102 will not be too large, thus better adapting to the flow of air and reducing unnecessary friction and vortex generation.

[0069] Among them, Rmed is used to adjust the relative lengths and amplitudes of the first arc segment 101 and the second arc segment 102. When Rmed is equal to 0.5(Rmax + Rmin), the lengths of the first arc segment 101 and the second arc segment 102 are almost equal. Taking the surface segment where Rmin is located as the wave crest and the surface segment where Rmax is located as the wave trough, if the inner cavity profile 100 varies as a sine wave, when Rmed is equal to 0.5(Rmax + Rmin), the first arc segment 101 and the second arc segment 102 are wave crests and wave troughs with equal height differences, that is to say, the amplitudes of the first arc segment 101 and the second arc segment 102 are the same. Among them, when Rmed < 0.5(Rmax + Rmin), the length of the first arc segment 101 is relatively smaller than that of the second arc segment 102, and the amplitude is also relatively smaller; when Rmed > 0.5(Rmax + Rmin), the length of the first arc segment 101 is relatively larger than that of the second arc segment 102, and the amplitude is also relatively larger.

[0070] Specifically, the values of Rmed include but are not limited to 0.40(Rmax + Rmin), 0.41(Rmax + Rmin), 0.42(Rmax + Rmin), 0.43(Rmax + Rmin), 0.44(Rmax + Rmin), 0.45(Rmax + Rmin), 0.46(Rmax + Rmin), 0.47(Rmax + Rmin), 0.48(Rmax + Rmin), 0.49(Rmax + Rmin), 0.50(Rmax + Rmin), 0.51(Rmax + Rmin), 0.52(Rmax + Rmin), 0.53(Rmax + Rmin), 0.54(Rmax + Rmin), 0.55(Rmax + Rmin), 0.56(Rmax + Rmin), 0.57(Rmax + Rmin), 0.58(Rmax + Rmin), 0.59(Rmax + Rmin) or 0.60(Rmax + Rmin).

[0071] In one embodiment, please refer to Figure 5 and Figure 6 , the air guide ring 10 further has an outer contour profile 200 corresponding to the inner cavity profile 100. The outer contour profile 200 includes a third arc segment 301 and a fourth arc segment 302. The third arc segment 301 is arranged corresponding to the position of the first arc segment 101, and the fourth arc segment 302 is arranged corresponding to the position of the second arc segment 102.

[0072] The outer contour line 200 refers to the projection or representation of the outer shape of an object in a two-dimensional space, usually used to describe the outer boundary or contour of the object. In this embodiment, the outer contour line 200 corresponds to the inner cavity line 100 and is used to define the shape of the outer wall surface of the air guiding ring 10, specifically as Figure 5 and Figure 6 shown.

[0073] Among them, the radius of curvature of the first arc segment 101 is R1, and R1 satisfies: 0.01R ≤ R1 ≤ 0.02R; the radius of curvature of the second arc segment 102 is R2, and R2 satisfies: 0.026R ≤ R2 ≤ 0.042R; the radius of curvature of the third arc segment 301 is R3, and R3 satisfies: 0.026R ≤ R3 ≤ 0.042R; the radius of curvature of the fourth arc segment 302 is R4, and R4 satisfies: 0.01R ≤ R4 ≤ 0.02R.

[0074] In this embodiment, R1, R2, R3, and R4 are limited within the above ranges, so that the change frequency of the tip clearance between the wind wheel and the air guiding ring 10 is within a more appropriate range. A suitable tip clearance change frequency can reduce the air flow turbulence and eddy current phenomena between the wind wheel blades and the air guiding ring 10, thereby reducing the aerodynamic noise.

[0075] The present utility model also proposes an air conditioner, which includes the air guiding ring 10 described in any of the foregoing embodiments, or includes the axial flow fan described in any of the foregoing embodiments. The specific structure of the air guiding ring 10 refers to the above embodiments. Since the axial flow fan adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one.

[0076] Among them, the air conditioner may be a window air conditioner, a split air conditioner, or a cabinet air conditioner. If the air conditioner is a split air conditioner, the air guiding ring 10 is provided in the outdoor unit of the split air conditioner. Of course, in other embodiments, the air guiding ring 10 can also be installed in the fan.

[0077] In the following embodiments of the present utility model, the air conditioner is a split air conditioner including an air conditioner outdoor unit. The air conditioner outdoor unit includes a housing and a front panel 20 installed on the housing. The front panel 20 is provided with an air outlet, and an air outlet grille 30 is installed at the air outlet. The wind wheel is installed in the housing, and the air outlet side of the wind wheel faces the air outlet. Among them, the axial flow wind wheel is installed in the outdoor unit of the air conditioner. By the rotation of the axial flow wind wheel, air is sent to the outdoor side to achieve the purpose of discharging heat to the outdoor side. The axial flow wind wheel can reduce the vortex shedding generated on the wind blades, and thus reduce the vortex shedding noise generated by the wind blades.

[0078] In one embodiment, the air conditioner outdoor unit includes a panel 20 and a grille 30. The panel 20 has opposite outer and inner sides. The air guide ring 10 is provided on the panel 20 and is located on the inner side of the panel 20; the grille 30 is provided on the panel 20 and is located on the outer side of the panel 20. A through groove is formed at a position corresponding to the first arc segment 101 of the air guide ring 10. The through groove extends along the air outlet direction of the air guide ring 10. A first air passing opening 21 is provided on the panel 20 at a position corresponding to the through groove, and a second air passing opening 31 is provided on the grille 30 at a position corresponding to the first air passing opening 21.

[0079] In this embodiment, the panel 20 is usually a component integrally formed by a panel 20 body and a motor bracket 23. The driving motor is provided on the motor bracket 23. The driving motor is used to drive the impeller, and the first air passing opening 21 is provided on the panel 20 body. The shape of the first air passing opening 21 is adapted to the shape of the through groove.

[0080] Exemplarily, the grille 30 usually includes a middle support member 32, an annular frame 33, spokes 34, and air guide strips 35. The middle support member 32 is provided inside the annular frame 33. One end of the spoke 34 is connected to the outer wall surface of the middle support member 32, and the other end of the spoke 34 is connected to the inner wall surface 300 of the annular frame 33. The number of the air guide strips 35 is usually multiple and is usually also annular. The air guide strips 35 are used to connect two adjacent spokes 34 and are arranged at intervals along the extending direction of the spokes 34.

[0081] Thus, in this embodiment, the settings of the first air passing opening 21 and the second air passing opening 31 can prevent the formation of cavity flow at the tail section of the air guide ring 10, making the end of the air guide ring 10 must maintain smooth flow. Secondly, the settings of the first air passing opening 21 and the second air passing opening 31 increase the total air outlet area and correspondingly reduce the air outlet resistance.

[0082] The above is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. An air guide ring, applied to a fan, characterized in that The air guide ring has an inner cavity profile line arranged in a ring shape. The inner cavity profile line includes adjacent first arc segments and second arc segments, and the curvatures of the first arc segment and the second arc segment are different.

2. The air guide ring according to claim 1, wherein The radius of curvature of the first arc segment and the second arc segment is not equal; and / or, the positions of the curvature action points of the first arc segment and the second arc segment are different.

3. The air guide ring according to claim 2, wherein The inner cavity profile line includes multiple first arc segments and multiple second arc segments, and the multiple first arc segments and the multiple second arc segments are alternately arranged in sequence along the circumference of the air guide ring.

4. The air guide ring according to claim 3, wherein The inner wall surface of the air guide ring includes a first curved surface segment and a second curved surface segment. The first curved surface segment corresponds to the first arc segment, and the second curved surface segment corresponds to the second arc segment. The first curved surface segment is a concave surface, and the second curved surface segment is a convex surface.

5. The air guide ring according to claim 4, characterized in that, The air guide ring has a first end and a second end opposite to each other along its axis. The inner wall surface of the air guide ring has a reference line parallel to the central axis of the air guide ring; the first curved surface segment and the second curved surface segment extend along the direction of the first end and the second end, and have a pointing line extending along the direction of the first end and the second end. The pointing line is arranged at an angle with the reference line.

6. The air guide ring according to claim 5, characterized in that, The angle between the pointing line and the reference line is not less than 15° and not greater than 45°.

7. An axial flow fan, characterized in that, Comprising: a wind wheel, and the air guide ring according to any one of claims 1 to 6, wherein the wind wheel is arranged inside the air guide ring.

8. The axial flow fan according to claim 7, characterized in that, The radius of the wind wheel is R, and the air guide ring has an outer radius and an inner radius; The minimum inner radius of the air guide ring is Rmin, and Rmin satisfies: Rmin > R + 5 mm; The maximum outer radius of the air guide ring is Rmax, and Rmax satisfies: Rmax < 1.09R.

9. The axial flow fan according to claim 8, wherein, The distance between the connection point of the first arc segment and the second arc segment and the central axis of the inner cavity profile line is Rmed; Rmed satisfies: 0.4(Rmax + Rmin) ≤ Rmed ≤ 0.6(Rmax + Rmin).

10. The axial flow fan according to claim 9, characterized in that, The air guide ring further has an outer contour profile line corresponding to the inner cavity profile line. The outer contour profile line includes a third arc segment and a fourth arc segment. The third arc segment is arranged at the position corresponding to the first arc segment, and the fourth arc segment is arranged at the position corresponding to the second arc segment; The radius of curvature of the first arc segment is R1, and R1 satisfies: 0.01R ≤ R1 ≤ 0.02R; The radius of curvature of the second arc segment is R2, and R2 satisfies: 0.026R ≤ R2 ≤ 0.042R; The radius of curvature of the third arc segment is R3, and R3 satisfies: 0.026R ≤ R3 ≤ 0.042R; The radius of curvature of the fourth arc segment is R4, and R4 satisfies: 0.01R ≤ R4 ≤ 0.02R.

11. An air conditioner, characterized in that, Comprising: the axial flow fan according to any one of claims 7 to 10; or, the air guide ring according to any one of claims 1 to 6.

12. The air conditioner according to claim 11, wherein, The air conditioner includes an outdoor unit of the air conditioner, and the outdoor unit of the air conditioner includes: a panel having an outer side and an inner side opposite to each other. The air guide ring is arranged on the panel and is located inside the panel; and a mesh cover arranged on the panel and located outside the panel; A ventilation slot is formed at a position of the air guide ring corresponding to the first arc segment, the ventilation slot extends along the air outlet direction of the air guide ring, a first air passing opening is arranged at a position of the panel corresponding to the ventilation slot, and a second air passing opening is arranged at a position of the wire mesh cover corresponding to the first air passing opening.

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