Air outlet grille and air conditioner outdoor unit

Abstract

The utility model relates to an air outlet grille and an air conditioner outdoor unit. The air outlet grille comprises an inner frame and an outer frame, the outer frame and the inner frame are coaxially arranged; the radial ribs are arranged at intervals in the circumferential direction of the outer frame; the spiral rib is provided with a first end and a second end, the first end of the spiral rib is connected with the inner frame, the second end of the spiral rib is connected with the outer frame, the spiral rib spirally extends in the circumferential direction of the inner frame and is connected with the radial rib, and the first end of the spiral rib and the second end of the spiral rib have a height difference in the axial middle section; the spiral ribs and the radial ribs intersect to form an air outlet of the air outlet grille, the air outlet of the air outlet grille is provided with a windward side and a leeward side which are oppositely arranged, the center of the windward side is lower than the periphery of the windward side, and the consistency of air outlet airflow interference of the air outlet grille on different phases in the circumferential direction can be destroyed; interference noise superposition of the air outlet grating is avoided, grating resistance and air outlet noise are effectively reduced, and the air volume is increased.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and in particular to an air outlet grille and an air conditioning outdoor unit. Background Art

[0002] The air outlet grille is generally installed at the fan outlet of the air conditioner outdoor unit, taking into account the functions of air rectification and air guidance and safety protection. At present, most air outlet grilles include radial ribs extending along the radius and circumferential ribs that spread outward to form concentric rings. Since the airflow blown out by the axial flow fan of the outdoor unit has a strong centrifugal effect, the airflow guidance effect of the grille will deteriorate when the airflow flows through the annular circumferential ribs; if the axial height of the circumferential ribs is large or the radial rib structure is not designed reasonably, the attenuation of the air volume will be further aggravated and the air outlet noise will increase.

[0003] In summary, how to effectively reduce the wind resistance and noise of the grille is a problem that technical personnel in this field urgently need to solve. Utility Model Content

[0004] The present application provides an air outlet grille and an air conditioner outdoor unit to solve the technical problems of large air volume attenuation and large air outlet noise in the existing air outlet grille.

[0005] In the first aspect, the present application provides an air outlet grille, comprising: an inner frame; an outer frame, coaxially arranged with the inner frame; a plurality of radial ribs, arranged at intervals along the circumference of the outer frame; and a spiral rib, having a first end and a second end, the first end of the spiral rib being connected to the inner frame, the second end of the spiral rib being connected to the outer frame, the spiral rib extending in a spiral direction along the circumference of the inner frame and connecting the radial ribs, and the first end of the spiral rib and the second end of the spiral rib having a height difference in an axial mid-section; wherein the spiral ribs and the radial ribs intersect to form an air outlet of the air outlet grille, and the air outlet of the air outlet grille has a windward side and a leeward side relatively arranged, and the center of the windward side is lower than the surrounding areas of the windward side.

[0006] In a possible implementation, the orthographic projections of the spiral ribs and the radial ribs on the axial mid-section have the same linear direction along the radial direction of the inner frame, and the air outlet of the air outlet grille is generally a wavy curve extending outward from the center of the inner frame.

[0007] In one possible implementation, the orthographic projection of the air outlet of the air outlet grille in the axial mid-section forms a recessed portion and a protruding portion, the protruding portion surrounds the circumference of the inner frame, and the protruding portion constitutes a crest of the wavy curve; the recessed portion is located between the protruding portion and the outer frame, and the recessed portion constitutes a trough of the wavy curve.

[0008] In a possible implementation, the spiral rib has a first axial height in the axial mid-section, the radial rib has a second axial height in the axial mid-section, and the first axial height is smaller than the second axial height.

[0009] In a possible implementation, a plurality of spiral ribs are provided, and the plurality of spiral ribs extend spirally in parallel; the inner frame includes a plurality of radial connecting plates and a plurality of circumferential connecting plates, the circumferential connecting plates are arc-shaped, the radial connecting plates and the circumferential connecting plates are arranged at intervals and connected end to end in sequence, and the plurality of radial connecting plates are connected to the spiral ribs one-to-one; and a plurality of spiral connecting parts corresponding one-to-one to the spiral ribs are provided on the outer frame.

[0010] In a possible implementation, the center point of the cross section of the spiral rib extends along the circumferential spiral of the inner frame to form a spiral track, and any point P on the spiral track satisfies:

[0011] R = ε1R1 + (ε2R2 - ε1R1) * T;

[0012]

[0013] Where R is the distance from point P to the center of the inner frame, point O, R1 is the radius of the circumferential connecting plate of the inner frame, R2 is the radius of the outer frame, θ i is the angle between the line connecting any point P on the i-th spiral rib and the center point O of the inner frame and the horizontal positive direction, 0≤T≤1, ε1 is the first offset coefficient, ε2 is the second offset coefficient, w is the distance between two adjacent spiral ribs, s is the number of spiral ribs, i is a positive integer, 1≤i≤s.

[0014] In one possible implementation, the axial cross-section of the spiral rib is an airfoil, and the radial width of the axial cross-section of the spiral rib gradually decreases from the leeward side to the windward side. The maximum radial width of the axial cross-section of any spiral rib is w1, and the maximum axial height of the axial cross-section of the corresponding spiral rib is h1. The ratio of w1 to h1 is greater than or equal to 0.3 and less than or equal to 0.5.

[0015] In one possible implementation, the axial cross-section of the radial rib is an airfoil, the maximum height of the axial cross-section of the radial rib is h2, h2 is greater than or equal to 1.2h1 and less than or equal to 1.8h1, and the maximum radial width of the axial cross-section of the radial rib is w2, w2 is greater than or equal to 0.6w1 and less than or equal to w1.

[0016] In a possible implementation, the radial rib has a folded edge at one end close to the leeward side, and a first angle is formed between the folded edge and the horizontal positive direction. The first angle is set to 91°-93°, and the minimum radial width of the folded edge is 0.8mm-1.4mm.

[0017] In a possible implementation, the orthographic projection of any radial rib on the horizontal plane is arc-shaped, and there is a second angle between the center line of the axial cross-section of any radial rib and the central axis of the inner frame. The second angle changes nonlinearly along the direction from the inner frame to the outer frame, and the second angle is set to 8°-30°.

[0018] In a possible implementation, the orthographic projection of the air outlet of the air outlet grille in the axial mid-section has a first straight line, a first arc, and a second arc connected in sequence, the first straight line is arranged close to the inner frame, the second arc is arranged close to the outer frame, the distance between the connection point between the first straight line and the first arc and the central axis of the inner frame is L, L is greater than or equal to 0.2R2 and less than or equal to 0.6R2, the radius of the first arc is R3, R3 is greater than or equal to 0.8R2 and less than or equal to 1.2R2, the radius of the second arc is R4, R4 is greater than or equal to 0.1R2 and less than or equal to 0.5R2, where R2 is the radius of the outer frame.

[0019] In a possible implementation, one end of some radial ribs is connected to the circumferential connecting plate of the inner frame, and the other end is connected to the spiral connecting part; the maximum axial distance between the end of the radial rib connected to the circumferential connecting plate and the windward side is H1, and the maximum axial distance between the end of the radial rib connected to the spiral connecting part and the windward side is H2, and the ratio of H2 to H1 is greater than or equal to 0.4 and less than or equal to 0.8.

[0020] In a second aspect, the present application provides an air-conditioning outdoor unit, comprising an air outlet grille as described above.

[0021] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0022] An air outlet grille and an air-conditioning outdoor unit provided in an embodiment of the present application, wherein spiral ribs connect and fix the radial ribs, and the air outlet of the air outlet grille composed of the radial ribs and the spiral ribs has a curve distribution on the windward side with a low center and high surrounding areas, which is more suitable for the direction in which the outlet air flow fully develops downstream. At the same time, the first end of the spiral rib has a height difference with the second end of the spiral rib on the axial mid-section, which destroys the consistency of the air outlet grille's interference with the outlet airflow at different circumferential phases, avoids the superposition of the air outlet grille interference noise, thereby effectively reducing the grille resistance and air outlet noise, and increasing the air volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0026] Figure 1 A three-dimensional diagram of an air outlet grille provided in an embodiment of the present application;

[0027] Figure 2 for Figure 1 The rear view of the air outlet grille is shown, which is a leeward side perspective;

[0028] Figure 3 for Figure 2 The cross-sectional view along the AA direction;

[0029] Figure 4 for Figure 3 The enlarged schematic diagram of the middle part B;

[0030] Figure 5 for Figure 2 Cross-sectional view along CC direction;

[0031] Figure 6 for Figure 5 The enlarged schematic diagram of the middle D part;

[0032] Figure 7 for Figure 2 A cross-sectional view along the EE direction;

[0033] Figure 8 This is a comparison chart of the air volume at the same speed between the embodiment of the present application and the prior art;

[0034] Fig. 9 This is a comparison chart of the power of the embodiment of the present application and the prior art at the same air volume;

[0035] Fig.10 This is a comparison chart of the noise under the same air volume between the embodiment of the present application and the prior art.

[0036] Description of reference numerals:

[0037] 1. Inner frame; 11. Radial connecting plate; 12. Circumferential connecting plate; 2. Outer frame; 21. Spiral connecting portion; 3. Radial ribs; 31. Folded edge; 4. Spiral ribs; 41. First end; 42. Second end; 5. Wave-shaped curve; 51. Recessed portion; 52. Protruding portion; 501. First straight line; 502. First arc line; 503. Second arc line; M1. Windward side; M2. Leeward side. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0039] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0040] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0041] In the prior art, the air outlet grille is generally installed at the fan outlet of the air conditioner outdoor unit, taking into account the functions of rectification and wind guidance and safety protection. At present, most air outlet grilles include radial ribs extending radially and circumferential ribs that spread outward to form concentric rings. The air conditioner outdoor unit generally uses axial flow fan blades, which have the characteristics of divergent air supply, that is, the airflow from the outdoor unit outlet to the outside has circumferential and radial rotation angles. Since the airflow blown out by the outdoor unit axial flow fan has a strong centrifugal effect, the airflow guiding effect of the grille will deteriorate when the airflow flows through the annular circumferential ribs. The traditional grille design takes into account the air volume and demolding, and the circumferential radial bars are less modified, and the wind resistance and noise of the grille are not well improved; if the axial height of the circumferential ribs is large or the radial rib structure is not reasonably designed, the attenuation of the air volume will be further aggravated and the air outlet noise will increase.

[0042] In order to solve the technical problems of large air volume attenuation and high air outlet noise in existing air outlet grilles, the present application provides an air outlet grille and an air-conditioning outdoor unit, which can destroy the consistency of the air outlet grille's interference with the air flow at the air outlet at different circumferential phases, avoid the superposition of the air outlet grille interference noise, thereby effectively reducing the grille resistance and air outlet noise, and increasing the air volume.

[0043] Figures 1 to 3 An air outlet grille provided in an embodiment of the present application includes an inner frame 1, an outer frame 2, a spiral rib 4 and a plurality of radial ribs 3, the outer frame 2 is coaxially arranged with the inner frame 1; the plurality of radial ribs 3 are arranged at intervals along the circumference of the outer frame 2; the spiral rib 4 has a first end 41 and a second end 42, the first end 41 of the spiral rib 4 is connected to the inner frame 1, the second end 42 of the spiral rib 4 is connected to the outer frame 2, the spiral rib 4 extends spirally along the circumference of the inner frame 1 and connects the radial ribs 3, and the orthographic projection of the first end 41 of the spiral rib 4 on the axial mid-section and the second end 42 of the spiral rib 4 on the axial mid-section have a height difference; wherein the spiral rib 4 and the radial rib 3 intersect to form an air outlet of the air outlet grille, and the air outlet of the air outlet grille has a windward side M1 and a leeward side M2 ​​that are relatively arranged, and the center of the windward side M1 is lower than the surrounding of the windward side M1.

[0044] It can be understood that the spiral ribs 4 connect and fix the radial ribs 3, and the air outlet of the air outlet grille composed of the radial ribs 3 and the spiral ribs 4 has a curve distribution on the windward side M1 with a low center and high surroundings, which is more suitable for the direction of full development of the air flow downstream. At the same time, the first end 41 of the spiral rib 4 and the second end 42 of the spiral rib 4 have a height difference in the axial mid-section, which destroys the consistency of the air outlet grille's interference with the air flow at the air outlet at different circumferential phases, avoids the superposition of the air outlet grille interference noise, thereby effectively reducing the grille resistance and air outlet noise, and increasing the air volume.

[0045] It should be noted that the outer frame 2 of this embodiment can be set to be circular. Of course, in other embodiments, the outer frame 2 can also be in any other applicable shape, such as square, without limitation. Similarly, the inner frame 1 can be circular or in any other applicable shape. The spiral direction of the spiral ribs 4 is the same as the rotation direction of the blades of the axial flow fan. Specifically applied to this embodiment, when viewed from the leeward side M2, as shown in FIG. Figure 2 As shown, the spiral rib 4 spirally extends in a counterclockwise direction.

[0046] For ease of understanding and explanation, the axial direction of the air outlet grille may be the Z axis shown in the figure.

[0047] In some embodiments, Figure 3 As shown, the orthographic projections of the spiral ribs 4 and the radial ribs 3 on the axial mid-section are consistent in the linear direction of the radial direction of the inner frame 1, and the air outlet of the air outlet grille is in the form of a wavy curve 5 extending outward from the center of the inner frame 1 as a base point. The windward side M1 is in the form of a wavy curve 5 with a low center and high surroundings. When the airflow passes through the air outlet grille from the front direction perpendicular to the windward side M1, since the height of the windward side M1 relative to the leeward side M2 ​​changes in the form of a wavy curve 5, the time for the airflow to pass through the windward side M1 is changed, and the time difference of the airflow leaving the leeward side M2 ​​is used to achieve the purpose of reducing the airflow pulsation, that is, the consistency of the air outlet grille's interference with the airflow at the air outlet at different circumferential phases is destroyed, the superposition of the grille interference noise is avoided, and the flow loss of part of the airflow in the axial direction of the grille is reduced, so that the air supply noise and power can be effectively reduced.

[0048] In some embodiments, Figure 3 As shown, the positive projection of the air outlet of the air outlet grille in the axial mid-section forms a concave portion 51 and a convex portion 52, the convex portion 52 surrounds the inner frame 1, and the convex portion 52 forms the crest of the wave-shaped curve 5; the concave portion 51 is located between the convex portion 52 and the outer frame 2, and the concave portion 51 forms the trough of the wave-shaped curve 5. It can be understood that on the windward side M1, the radial ribs 3 and the spiral ribs 4 near the inner frame 1 form an arc that is concave inward, and the radial ribs 3 and the spiral ribs 4 near the outer frame 2 form an arc that is convex outward, thereby destroying the consistency of the air outlet grille's interference with the airflow at different circumferential phases, and effectively reducing the air supply noise. Two adjacent radial ribs 3 are evenly spaced along the circumferential direction of the inner frame 1, so that the airflow is evenly discharged through the air outlet grille, reducing the noise caused by airflow pulsation.

[0049] In some embodiments, the spiral rib 4 has a first axial height t1 on the axial mid-section, and the radial rib 3 has a second axial height t2 on the axial mid-section, and the first axial height is less than the second axial height. By setting the axial height of the spiral rib 4 to be less than the axial height of the radial rib 3, the consistency of the grille's interference with the outlet airflow in the axial height is destroyed, and the superposition of the grille interference noise is avoided, thereby effectively reducing the grille resistance and the wind noise, and increasing the air volume. In addition, the flow resistance of the entire spiral rib 4 flow channel can be reduced, and the higher radial ribs 3 can ensure the overall structural strength of the outlet grille.

[0050] In some embodiments, a plurality of spiral ribs 4 are provided, and the plurality of spiral ribs 4 extend in parallel and spirally; the inner frame 1 includes a plurality of radial connecting plates 11 and a plurality of circumferential connecting plates 12, the radial connecting plates 11 and the circumferential connecting plates 12 are arranged at intervals and connected end to end in sequence, the radial connecting plates 11 extend along the radial direction of the outer frame 2, the circumferential connecting plates 12 are arc-shaped and extend along the circumferential direction of the outer frame 2, and the plurality of radial connecting plates 11 are connected to the spiral ribs 4 in a one-to-one correspondence; the outer frame 2 is provided with a plurality of spiral connecting portions 21 corresponding to the spiral ribs 4 in a one-to-one correspondence, and the spiral connecting portions 21 are half-moon-shaped. The overall structural strength of the air outlet grille can be improved by providing the radial connecting plates 11 and the spiral connecting portions 21.

[0051] It should be noted that too few spiral ribs 4 will reduce the recognition and structural strength, and too many spiral ribs 4 will lead to reduced wind resistance performance. Generally, the number of blades of the fan blades of the axial flow fan is usually 3 or 4. In this embodiment, the spiral ribs 4 can be set to 3 or 4 accordingly to improve the matching of the air outlet grille and the fan blades, ensure the overall structural strength of the air outlet grille, avoid excessive wind resistance, and take into account both appearance and performance.

[0052] In some embodiments, Figure 2 As shown, the cross-sectional center point of the spiral rib 4 extends along the circumferential spiral of the inner frame 1 to form a spiral track, and any point P on the spiral track satisfies:

[0053] R = ε1R1 + (ε2R2 - ε1R1) * T;

[0054]

[0055] Wherein, R is the distance from point P to the center point O of the inner frame 1, R1 is the radius of the circumferential connecting plate 12 of the inner frame 1, and R2 is the radius of the inner side of the outer frame 2. The units of R, R1 and R2 are all mm;

[0056] θi is the angle between the line connecting any point P on the i-th spiral rib 4 and the center point O of the inner frame 1 and the horizontal positive direction, in degrees, and the horizontal square can be the positive axis direction of the X-axis in the figure;

[0057] 0≤T≤1, when T=0, it is the starting point of the spiral track connecting the inner frame 1, when T=1, it is the end point of the spiral track connecting the outer frame 2, and when T=0.5, it is the midpoint of the spiral track;

[0058] ε1 is the first offset coefficient, ε1=0.9-1.1; ε2 is the second offset coefficient, ε2=0.9-1.1; the two offset coefficients are set to make the transition between the spiral track and the radial connecting plate 11 of the inner frame 1 and the spiral connecting portion 21 of the outer frame 2 smoother, and to adjust the width of the radial connecting plate 11 and the end of the spiral connecting portion 21 to meet the structural gap requirements;

[0059] w is the distance between two adjacent spiral ribs 4, preferably w=8.6-12mm, to meet the strength requirements of the grid test finger; the range of w meets the safety regulations of the adult test finger, avoiding that a lower distance causes a larger grid resistance, and a larger distance does not meet the safety protection requirements;

[0060] s is the number of spiral ribs 4, s and i are both positive integers, 1≤i≤s; preferably, s is set to 3 or 4 to improve the matching of the air outlet grille and the fan blades, ensure the overall structural strength of the air outlet grille, avoid excessive wind resistance, and take into account both appearance and performance.

[0061] In some embodiments, Figure 4 As shown, the axial cross section of the spiral rib 4 is an airfoil, and the radial width of the axial cross section of the spiral rib 4 gradually decreases from the leeward side M2 ​​to the windward side M1. The maximum radial width of the axial cross section of any spiral rib 4 is w1, and the maximum axial height of the axial cross section of the corresponding spiral rib 4 is h1. The ratio of w1 to h1 is greater than or equal to 0.3 and less than or equal to 0.5, preferably h1 = 5mm-7mm. The value of w1 / h1 stipulates that the axial height of the scanning cross section of the spiral rib 4 is greater than the radial width. The appropriate axial height and radial width reduce the overall resistance of the spiral rib 4 and ensure a certain structural strength, so that the overall wind resistance of the air outlet grille is reduced, which is more conducive to increasing the air flow rate.

[0062] In some embodiments, Figure 5 and Figure 6As shown, the axial cross section of the radial rib 3 is an airfoil, and the axial cross section of the radial rib 3 may be provided with a rounded corner on the windward side M1 or the leeward side M2. The maximum height of the axial cross section of the radial rib 3 is h2, which is greater than or equal to 1.2h1 and less than or equal to 1.8h1. The maximum radial width of the axial cross section of the radial rib 3 is w2, which is greater than or equal to 0.6w1 and less than or equal to w1. The axial cross sections h2 and w2 of the radial rib 3 are matched with the axial cross sections h1 and w1 of the spiral rib 4 to further improve the comprehensive performance of the air outlet grille. The axial height of the spiral rib 4 is lower than the axial height of the radial rib 3 to reduce the flow resistance of the entire spiral track flow channel. At the same time, the higher radial rib 3 can ensure the structural strength of the grille; in terms of thickness, the radial rib 3 is thinner to reduce the annular resistance, and the thicker spiral rib 4 ensures the structural strength of the grille.

[0063] In some embodiments, Figure 6 As shown, the radial rib 3 has a folded edge 31 at one end close to the leeward side M2, and a first angle Φ is formed between the folded edge 31 and the horizontal positive direction, and the first angle Φ is set to 91°-93°, and the minimum radial width w3 of the folded edge 31 is 0.8mm-1.4mm. The folded edge 31 is conducive to solving the demolding problem of the leeward side M2 ​​of the grille, while ensuring a certain structural strength. Appropriate Φ and w3 ensure smooth demolding of the radial rib 3. If Φ is too small, the radial rib 3 structure will form an undercut and cannot be demolded smoothly. If Φ is too large, it will affect the design of the minimum radial width w3 of the folded edge 31.

[0064] like Figure 2 As shown, the positive projection of any radial rib 3 on the horizontal plane is an arc. It should be noted that when the present air outlet grille is applied, the bending direction of the radial rib 3 should be determined according to, for example, the rotation direction of the blades of the axial flow fan, that is, the bending direction of the radial rib 3 is the same as the rotation direction of the blades of the axial flow fan. For example, when the blades of the axial flow fan rotate counterclockwise, the radial rib 3 is formed into an arc that bends counterclockwise. Specifically applied to the embodiment, on the leeward side M2, the arc-shaped protrusion of the radial rib 3 faces the clockwise direction. There is a second angle γ between the center line of the axial cross section of any radial rib 3 and the central axis of the inner frame 1. The second angle γ changes nonlinearly along the direction from the inner frame 1 to the outer frame 2, and the second angle γ is set to 8°-30°. The airflow angle of the blades of the axial flow fan is not uniform in the radial direction. Through the nonlinear change of γ, the airflow of the blades is adapted to reduce the airflow resistance and noise of the grille.

[0065] In some embodiments, Figure 7As shown, the orthographic projection of the air outlet of the air outlet grille in the axial mid-section has a first straight line 501, a first arc 502 and a second arc 503 connected in sequence, the first straight line 501 is arranged close to the inner frame 1, the second arc 502 is arranged close to the outer frame 2, the distance between the connection point between the first straight line 501 and the first arc 502 and the central axis of the inner frame 1 is L, 0.2R2≤L≤0.6R2, the radius of the first arc 502 is R3, 0.8R2≤R3≤1.2R2, the radius of the second arc 503 is R4, 0.1R2≤R4≤0.5R2, wherein R2 is the radius of the outer frame 2. L, R3, and R4 are designed to match the inner radius R2 of the outer frame 2 to meet the design requirements of grilles of different sizes; L, R3, and R4 are designed to be too large, which will make the wavy curve 5 of the air outlet of the air outlet grille tend to be straight, the axial height difference of each position along the radial direction becomes smaller, and the time difference of the airflow passing through the grille becomes smaller, which will cause the superposition of interference noise. By adjusting the parameters of L, R3, and R4 to adapt to the airflow of the blades of the axial flow fan, the purpose of reducing drag and noise is achieved.

[0066] like Figure 2 and Figure 7 As shown, one end of some radial ribs 3 is connected to the circumferential connecting plate 12 of the inner frame 1, and the other end is connected to the spiral connecting portion 21; the maximum axial distance between the end of the radial rib 3 connected to the circumferential connecting plate 12 and the windward side M1 is H1, and the maximum axial distance between the end of the radial rib 3 connected to the spiral connecting portion 21 and the windward side M1 is H2, 0.4≤H2 / H1≤0.8, preferably H1=30mm-40mm. The size design of H2 and H1 will affect the undulation height of the outlet wavy curve 5. In order to match different fan blades, the spacing between the grille and the fan blade is adjusted. Within a suitable height range, the undulation of the outlet wavy curve 5 can match the direction of the fan blade outlet airflow, reduce flow resistance, and reduce the superposition of interference noise. If H2 and H1 are too small, the overall resistance of the grille will increase; when they are too large, the resistance reduction is not obvious, but affects the appearance design.

[0067] At present, the outdoor unit of the air conditioner generally uses an axial fan, which has the characteristics of divergent air supply, that is, the airflow from the outdoor unit outlet to the outside has circumferential and radial rotation angles. The traditional grille design takes into account the air volume and mold release, and the circumferential radial strips are rarely changed, and the wind resistance and noise of the grille have not been well improved. Figures 8 to 10 As shown, the air volume of the whole machine is improved at each fan speed in this embodiment. 3 / h air volume, the power of this embodiment is reduced by about 25W and the noise is reduced by about 0.9dB(A).

[0068] The embodiment of the present application also provides an air conditioner outdoor unit, including an axial flow fan and the air outlet grille as described above. The embodiment of the air conditioner outdoor unit includes all technical solutions of all embodiments of the air outlet grille, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0069] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described in the text are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0070] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0071] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An air outlet grille, characterized in that: include: Inner frame (1); An outer frame (2) is coaxially arranged with the inner frame (1); A plurality of radial ribs (3) are arranged at intervals along the circumference of the outer frame (2); and A spiral rib (4) having a first end (41) and a second end (42), wherein the first end (41) of the spiral rib (4) is connected to the inner frame (1), and the second end (42) of the spiral rib (4) is connected to the outer frame (2), the spiral rib (4) extends in a spiral along the circumference of the inner frame (1) and is connected to the radial rib (3), and the first end (41) of the spiral rib (4) and the second end (42) of the spiral rib (4) have a height difference in an axial mid-section; The spiral ribs (4) and the radial ribs (3) intersect to form an air outlet of the air outlet grille, and the air outlet of the air outlet grille has a windward side (M1) and a leeward side (M2) that are arranged opposite to each other, and the center of the windward side (M1) is lower than the surrounding of the windward side (M1).

2. The air outlet grille according to claim 1, characterized in that: The orthographic projections of the spiral ribs (4) and the radial ribs (3) on the axial mid-section have the same linear orientation along the radial direction of the inner frame (1), and the air outlet of the air outlet grille is generally in the form of a wavy curve (5) extending outwards from the center of the inner frame (1) as a base point.

3. The air outlet grille according to claim 2, characterized in that: The air outlet of the air outlet grille forms a recessed portion (51) and a protruding portion (52) in the orthographic projection of the axial mid-section, the protruding portion (52) surrounds the circumference of the inner frame (1), and the protruding portion (52) forms the crest of the wavy curve (5); the recessed portion (51) is located between the protruding portion (52) and the outer frame (2), and the recessed portion (51) forms the trough of the wavy curve (5).

4. The air outlet grille according to claim 1, characterized in that: The spiral rib (4) has a first axial height on the axial mid-section, and the radial rib (3) has a second axial height on the axial mid-section, wherein the first axial height is smaller than the second axial height.

5. The air outlet grille according to claim 1, characterized in that: A plurality of spiral ribs (4) are provided, and the plurality of spiral ribs (4) extend in parallel and spirally; the inner frame (1) comprises a plurality of radial connecting plates (11) and a plurality of circumferential connecting plates (12), and the circumferential connecting plates (12) are arc-shaped, and the radial connecting plates (11) and the circumferential connecting plates (12) are arranged at intervals and connected end to end in sequence, and the plurality of radial connecting plates (11) are connected to the spiral ribs (4) in a one-to-one correspondence; and a plurality of spiral connecting parts (21) are provided on the outer frame (2) and correspond to the spiral ribs (4) in a one-to-one correspondence.

6. The air outlet grille according to claim 5, characterized in that: The center point of the cross section of the spiral rib (4) extends along the circumferential spiral of the inner frame (1) to form a spiral track, and any point P on the spiral track satisfies: R = ε1R1 + (ε2R2 - ε1R1) * T; Wherein, R is the distance from point P to the center point O of the inner frame (1), R1 is the radius of the circumferential connecting plate (12) of the inner frame (1), R2 is the radius of the outer frame (2), θ i is the angle between a line connecting any point P on the i-th spiral rib (4) and the center point O of the inner frame (1) and the horizontal positive direction, 0≤T≤1, ε1 is the first offset coefficient, ε2 is the second offset coefficient, w is the distance between two adjacent spiral ribs (4), s is the number of spiral ribs (4), i is a positive integer, 1≤i≤s.

7. The air outlet grille according to claim 1, characterized in that: The axial cross section of the spiral rib (4) is an airfoil, and the radial width of the axial cross section of the spiral rib (4) gradually decreases from the leeward side (M2) to the windward side (M1), the maximum radial width of the axial cross section of any one of the spiral ribs (4) is w1, and the maximum axial height of the corresponding axial cross section of the spiral rib (4) is h1, and the ratio of w1 to h1 is greater than or equal to 0.3 and less than or equal to 0.

5.

8. The air outlet grille according to claim 7, characterized in that: The axial cross section of the radial rib (3) is an airfoil, the maximum height of the axial cross section of the radial rib (3) is h2, h2 is greater than or equal to 1.2h1 and less than or equal to 1.8h1, and the maximum radial width of the axial cross section of the radial rib is w2, w2 is greater than or equal to 0.6w1 and less than or equal to w1.

9. The air outlet grille according to claim 1, characterized in that: The radial rib (3) has a folded edge (31) at one end close to the leeward side, and a first angle is formed between the folded edge (31) and the horizontal positive direction, the first angle is set to 91°-93°, and the minimum radial width of the folded edge (31) is 0.8mm-1.4mm.

10. The air outlet grille according to claim 1, characterized in that: The orthographic projection of any one of the radial ribs (3) on a horizontal plane is arc-shaped, and a second angle is formed between the center line of the axial cross section of any one of the radial ribs (3) and the central axis of the inner frame (1), and the second angle changes nonlinearly along the direction from the inner frame (1) to the outer frame (2), and the second angle is set to 8°-30°.

11. The air outlet grille according to claim 1, characterized in that: The air outlet of the air outlet grille has a first straight line (501), a first arc (502) and a second arc (503) connected in sequence in the orthographic projection of the axial mid-section, the first straight line (501) is arranged close to the inner frame (1), the second arc (503) is arranged close to the outer frame (2), the distance between the connection point between the first straight line (501) and the first arc (502) and the central axis of the inner frame (1) is L, L is greater than or equal to 0.2R2 and less than or equal to 0.6R2, the radius of the first arc (502) is R3, R3 is greater than or equal to 0.8R2 and less than or equal to 1.2R2, the radius of the second arc (503) is R4, R4 is greater than or equal to 0.1R2 and less than or equal to 0.5R2, and R2 is the radius of the outer frame (2).

12. The air outlet grille according to claim 5, characterized in that: One end of some of the radial ribs (3) is connected to the circumferential connecting plate (12) of the inner frame (1), and the other end is connected to the spiral connecting portion (21); the maximum axial distance between the end of the radial rib (3) connected to the circumferential connecting plate (12) and the windward side (M1) is H1, and the maximum axial distance between the end of the radial rib (3) connected to the spiral connecting portion (21) and the windward side (M1) is H2, and the ratio of H2 to H1 is greater than or equal to 0.4 and less than or equal to 0.

8.

13. An air conditioner outdoor unit, characterized in that: It comprises the air outlet grille as claimed in any one of claims 1 to 12.

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