Grid structure and air conditioner outdoor unit with same

Abstract

The invention provides a grid structure and an air conditioner outdoor unit with the grid structure. The grid structure comprises a low-speed ventilation part and a high-speed ventilation part which are connected with each other, and the high-speed ventilation part is arranged around the outer edge of the low-speed ventilation part; the low-speed ventilation part comprises a plurality of first annular ribs arranged at intervals in the radial direction of the grid structure and a plurality of first radial ribs arranged at intervals in the annular direction of the grid structure, and the first radial ribs are connected with the first annular ribs; the high-speed ventilation part comprises a plurality of second annular ribs arranged at intervals in the radial direction of the grid structure and a plurality of second radial ribs arranged at intervals in the annular direction of the grid structure, and the second radial ribs are connected with the second annular ribs; wherein the grid structure is provided with a windward side and a leeward side which are oppositely arranged; on the windward side, the low-speed ventilation part protrudes out of the high-speed ventilation part. By means of the technical scheme, the problem that in the prior art, an air outlet grille usually causes large noise can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of air outlet grilles, and in particular to a grille structure and an air conditioner outdoor unit having the grille structure. Background Art

[0002] At present, the air outlet grille is an important pneumatic component of the air conditioner outdoor unit. The air outlet grille not only has the basic safety protection function, but also takes into account the pneumatic drainage function of concentrated air supply.

[0003] However, the air outlet grilles in the prior art usually generate relatively loud noises, which results in a significant increase in the noise radiation level of the air conditioner outdoor unit. Summary of the invention

[0004] The main purpose of the present invention is to provide a grille structure and an air conditioner outdoor unit having the same, so as to solve the problem that the air outlet grille in the prior art usually causes a large amount of noise.

[0005] In order to achieve the above object, according to one aspect of the present invention, a grid structure is provided, comprising:

[0006] A low-speed ventilation part and a high-speed ventilation part connected to each other, wherein the high-speed ventilation part is arranged around the outer edge of the low-speed ventilation part; the low-speed ventilation part comprises a plurality of first annular ribs arranged at intervals along the radial direction of the grille structure and a plurality of first radial ribs arranged at intervals along the circumferential direction of the grille structure, wherein the first radial ribs are connected to the plurality of first annular ribs; the high-speed ventilation part comprises a plurality of second annular ribs arranged at intervals along the radial direction of the grille structure and a plurality of second radial ribs arranged at intervals along the circumferential direction of the grille structure, wherein the second radial ribs are connected to the plurality of second annular ribs;

[0007] Wherein, the grille structure has a windward side and a leeward side which are arranged opposite to each other; on the windward side, the low-speed ventilation part is arranged to protrude from the high-speed ventilation part.

[0008] Further, the annular distribution density of the plurality of second radial ribs is greater than the annular distribution density of the plurality of first radial ribs; and / or,

[0009] The maximum distance between two adjacent second radial ribs is smaller than the minimum distance between two adjacent first radial ribs; and / or,

[0010] The projections of the outer edge of the grille structure and the inner side of the outer edge of the low-speed ventilation part on the axial vertical plane of the grille structure are both circular, the projection of the inner side of the outer edge of the low-speed ventilation part on the axial vertical plane corresponds to a diameter D1, and the projection of the outer edge of the grille structure on the axial vertical plane corresponds to a diameter D2, 0.58≤D1 / D2≤0.88.

[0011] Further, the grille structure is arranged opposite to the fan blade, the plurality of second radial ribs are bent along a preset direction, and the rotation direction formed by the plurality of second radial ribs is the same as the rotation direction of the fan blade; and / or,

[0012] The projection of the second radial rib on the axial perpendicular plane of the grid structure forms a second radial characteristic line, and the second radial characteristic line is a two-dimensional spiral line.

[0013] Further, the projection of the first radial rib on the axial vertical plane of the grid structure forms a first radial characteristic line, and the first radial characteristic line includes a first arc segment and a second arc segment which are connected and arranged;

[0014] Wherein, the first arc segment and the second arc segment have opposite bending directions; and / or,

[0015] The first arc segment is located on a side of the second arc segment away from the high-speed ventilation portion, and the bending direction of the first arc segment is the same as the bending direction of a second radial characteristic line formed by a projection of the second radial rib on the axial vertical plane of the grid structure;

[0016] The first arc segment and the second arc segment are tangent at a connection point.

[0017] Furthermore, the low-speed ventilation portion further includes a third radial rib, wherein the third radial rib is disposed between two adjacent first radial ribs and is spaced apart from the two adjacent first radial ribs;

[0018] Wherein, the radial length of the third radial rib in the radial direction of the grid structure is smaller than the radial length of the first radial rib in the grid structure; and / or,

[0019] The third radial rib is located on a side of the low-speed ventilation portion close to the high-speed ventilation portion.

[0020] Furthermore, the low-speed ventilation portion has a third radial characteristic line in the cross-section of the grille structure along the axis, and the third radial characteristic line is an arc connecting segment; the high-speed ventilation portion has a fourth radial characteristic line in the cross-section of the grille structure along the axis, and the fourth radial characteristic line is a straight line connecting segment.

[0021] Further, the arc connecting segment includes a third arc segment and a fourth arc segment connected to each other;

[0022] Wherein, the bending directions of the third arc segment and the fourth arc segment are opposite; and / or,

[0023] The third arc segment and the fourth arc segment are tangent at a connection point.

[0024] Further, the maximum distance between two adjacent second radial ribs is t1, 9mm≤t1≤10.5mm; and / or,

[0025] The maximum distance between two adjacent first annular ribs is t2, 9mm≤t2≤10.5mm.

[0026] Furthermore, the projection of the second radial rib on the axial vertical plane of the grid structure is a two-dimensional spiral line; the curve of the two-dimensional spiral line on the axial vertical plane should satisfy the following formula:

[0027] R=A+B*T, A=0.5*D1; B=0.5*(D2-D1); β=±(CD+D*T), 0≤T≤1;

[0028] Among them, R represents the radial distribution law of the curve, β represents the circumferential distribution law of the curve, A represents the starting point position of the spiral line in the R direction, B represents the radius increment of the starting point of the spiral line in the R direction, C represents the initial phase of the spiral line in the β direction, D represents the increment of the spiral line in the β direction, D1 is the diameter corresponding to the projection of the inner side of the outer edge of the low-speed ventilation part on the vertical plane of the axis, and D2 is the diameter corresponding to the projection of the inner side of the outer edge of the grille structure on the vertical plane of the axis.

[0029] Further, the projection of the first radial rib on the axial vertical plane of the grid structure forms a first radial characteristic line, and the central angles corresponding to the two ends of the first radial characteristic line are α, 5°≤α≤50°; and / or,

[0030] The projection of the second radial rib on the axial vertical plane of the grid structure forms a second radial characteristic line, and the central angles corresponding to the two ends of the second radial characteristic line are γ, 5°≤γ≤25°; and / or,

[0031] The grille structure further comprises an outer frame and an inner cover, wherein the outer frame is arranged around the outer periphery of the high-speed ventilation part, and the width of the outer frame in the axial direction of the grille structure is T1; the low-speed ventilation part is arranged around the outer periphery of the inner cover, and the width of the inner cover in the axial direction of the grille structure is T2, T2 <T1。

[0032] Further, the radial cross section of the first radial rib and / or the radial cross section of the second radial rib is a streamlined cross section, and the streamlined cross section has an arc edge facing the windward side and rib edges respectively located on both sides of the arc edge, the radius corresponding to the arc edge is r, and the length of the rib edge is l;

[0033] Wherein, r=a+b*t, 0.5mm≤a≤1mm, 0.2mm≤b≤1mm; and / or,

[0034] I=c+d*t, 4mm≤c≤7mm, 2mm≤d≤5mm;

[0035] 0≤t≤1.

[0036] Specifically, the width of the streamlined cross-section gradually increases from one end of the streamlined cross-section close to the grid structure to one end of the streamlined cross-section far from the grid structure, so as to guide the airflow.

[0037] Further, the second radial rib has a first radial cross-section at an end close to the first radial rib, and the second radial rib has a second radial cross-section at an end away from the first radial rib; the first radial cross-section has a first arc edge facing the windward side and first rib edges respectively located on both sides of the first arc edge, the radius corresponding to the first arc edge is r1, and the length of the first rib edge is l1; the second radial cross-section has a second arc edge facing the windward side and second rib edges respectively located on both sides of the second arc edge, the radius corresponding to the second arc edge is r2, and the length of the second rib edge is l2; the first radial rib has a third radial section at an end away from the second radial rib, and the first radial rib has a fourth radial section at an end close to the second radial rib; the third radial section has a third arc edge facing the windward side and third rib edges respectively located on both sides of the third arc edge, the radius corresponding to the third arc edge is r3, and the length of the third rib edge is l3; the fourth radial section has a fourth arc edge facing the windward side and fourth rib edges respectively located on both sides of the fourth arc edge, the radius corresponding to the fourth arc edge is r4, and the length of the fourth rib edge is l4;

[0038] Where r2>r1; and / or,

[0039] l2>l1; and / or,

[0040] r4>r3; and / or,

[0041] l4>l3.

[0042] Further, a first installation angle θ1 is formed between the second radial rib and the axial vertical plane of the grid structure, 65°≤θ1≤85°; and / or,

[0043] A second installation angle θ2 is formed between the first radial rib and the axial vertical plane of the grid structure, and the angle θ2 is 40°≤θ2≤80°.

[0044] According to another aspect of the present invention, there is provided an air conditioner outdoor unit, comprising:

[0045] An outdoor unit housing, wherein an air outlet is provided on the outdoor unit housing;

[0046] The grille structure provided above is installed at the air outlet.

[0047] By applying the technical solution of the present invention, the high-speed ventilation part is arranged on a side farther from the windward side than the low-speed ventilation part, which can reduce the inlet attack angle of the high-speed ventilation part, especially reduce the inlet attack angle of the second radial rib, reduce the impact loss and interference separation noise. Therefore, it can solve the problem that the air outlet grille in the prior art usually causes a large noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0049] Figure 1 A schematic structural diagram of a grid structure provided according to an embodiment of the present invention is shown;

[0050] Figure 2 A front view of a grid structure provided according to an embodiment of the present invention is shown;

[0051] Figure 3 Shows Figure 2 AA direction schematic diagram;

[0052] Figure 4 Shows Figure 2 The enlarged view of point B;

[0053] Figure 5 Shows Figure 2 Enlarged view of point C;

[0054] Figure 6 A schematic structural diagram of a grid structure provided at another angle according to an embodiment of the present invention is shown;

[0055] Figure 7 Shows Figure 6 The enlarged view of point D;

[0056] Figure 8 Shows Figure 6 The enlarged view of point E;

[0057] Fig. 9 A schematic diagram of a streamlined cross section provided according to an embodiment of the present invention is shown;

[0058] Fig.10 The distribution law of the first installation angle of the second radial rib of the high-speed ventilation portion provided according to the embodiment of the present invention is shown;

[0059] Fig.11The distribution law of the second installation angle of the first radial rib of the low-speed ventilation portion provided according to an embodiment of the present invention is shown;

[0060] Fig.12 A schematic diagram showing the relationship between the rotation speed and the air volume of the grille structure provided according to an embodiment of the present invention is shown;

[0061] Fig.13 A schematic diagram showing the relationship between the air volume and noise of a grille structure provided according to an embodiment of the present invention is shown.

[0062] The above drawings include the following reference numerals:

[0063] 10. low-speed ventilation portion; 11. first annular rib; 12. first radial rib; 120. first radial characteristic line; 121. first arc segment; 122. second arc segment; 13. third radial rib; 14. third radial characteristic line; 141. third arc segment; 142. fourth arc segment;

[0064] 20. high-speed ventilation portion; 21. second annular rib; 22. second radial rib; 220. second radial characteristic line; 23. fourth radial characteristic line;

[0065] 30. Frame;

[0066] 40. Inner cover;

[0067] 51. Arc edge; 52. Rib edge. DETAILED DESCRIPTION

[0068] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0069] like Figures 1 to 9 As shown, the first embodiment of the present invention provides a grille structure, which includes a low-speed ventilation part 10 and a high-speed ventilation part 20 connected to each other, and the high-speed ventilation part 20 is arranged around the outer edge of the low-speed ventilation part 10; the low-speed ventilation part 10 includes a plurality of first annular ribs 11 arranged at intervals along the radial direction of the grille structure and a plurality of first radial ribs 12 arranged at intervals along the circumferential direction of the grille structure, and the first radial ribs 12 are connected to the plurality of first annular ribs 11; the high-speed ventilation part 20 includes a plurality of second annular ribs 21 arranged at intervals along the radial direction of the grille structure and a plurality of second radial ribs 22 arranged at intervals along the circumferential direction of the grille structure, and the second radial ribs 22 are connected to the plurality of second annular ribs 21. Wherein, the grille structure has a windward side and a leeward side arranged oppositely; as shown in FIG. Figure 1 As shown, on the windward side, the low-speed ventilation part 10 is arranged to protrude from the high-speed ventilation part 20.

[0070] By adopting the grille structure provided in this embodiment, the high-speed ventilation part 20 is arranged on a side farther from the windward side than the low-speed ventilation part 10, so that the inlet attack angle of the high-speed ventilation part 20 can be reduced, especially the inlet attack angle of the second radial rib 22 can be reduced, and the impact loss and interference separation noise can be reduced. Therefore, the problem that the air outlet grille in the prior art usually causes a large noise can be solved.

[0071] In this embodiment, the annular distribution density of the plurality of second radial ribs 22 is greater than the annular distribution density of the plurality of first radial ribs 12. The first radial ribs 12 of the inner layer adopt a low-density weak straightening rib design, which is adapted to the low-speed turbulent airflow of the inner layer, suppresses the scale and strength of the rib tail vortex shedding, reduces noise and increases air volume. The second radial ribs 22 of the outer layer adopt a high-density strong straightening rib design, which is adapted to comb the high-speed rotating airflow of the outer layer, reduces wind resistance and increases air volume.

[0072] Preferably, the outer high-speed ventilation part 20 and the inner low-speed ventilation part 10 in this embodiment are designed independently. The outer straight grille adopts a high-density strong straightening rib design, which is suitable for combing the outer high-speed rotating airflow, reducing wind resistance and increasing air volume; the inner arc grille adopts a low-density weak straightening rib design, which is suitable for the inner low-speed turbulent airflow, suppressing the scale and strength of the rib tail vortex shedding, reducing noise and increasing air volume.

[0073] The maximum spacing between two adjacent second radial ribs 22 is smaller than the minimum spacing between two adjacent first radial ribs 12 , so that the annular distribution density of the plurality of second radial ribs 22 is greater than the annular distribution density of the plurality of first radial ribs 12 .

[0074] Specifically, the projections of the outer edge of the grille structure and the outer edge of the low-speed ventilation part 10 on the axial vertical plane of the grille structure are both circular, the projection of the inner side of the outer edge of the low-speed ventilation part 10 on the axial vertical plane corresponds to a diameter D1, and the projection of the inner side of the outer edge of the grille structure on the axial vertical plane corresponds to a diameter D2, 0.58≤D1 / D2≤0.88. Specifically, through such an arrangement, it is convenient to better make the low-speed ventilation part 10 and the high-speed ventilation part have a suitable range, so as to better reduce noise and reduce wind resistance.

[0075] It should be noted that “the inner side of the outer edge of the low-speed ventilation part 10” can be understood as the inner side of the annular ribs at the outer edge of the low-speed ventilation part 10. “The inner side of the outer edge of the grille structure” can be understood as the inner side of the annular ribs at the outer edge of the grille structure.

[0076] Specifically, the grille structure is arranged opposite to the fan blade, the plurality of second radial ribs 22 are bent along a preset direction, and the rotation direction formed by the plurality of second radial ribs 22 is the same as the rotation direction of the fan blade, so as to better reduce noise and wind resistance.

[0077] The projection of the second radial rib 22 on the axial vertical plane of the grid structure forms a second radial characteristic line 220, and the second radial characteristic line 220 is a two-dimensional spiral line, so as to better guide the high-speed airflow and reduce the wind noise.

[0078] like Figure 2 As shown, the projection of the first radial rib 12 on the axial vertical plane of the grid structure forms a first radial characteristic line 120, and the first radial characteristic line 120 includes a first arc segment 121 and a second arc segment 122 connected and arranged; wherein the first arc segment 121 and the second arc segment 122 have opposite bending directions, so as to better adapt to the turbulent airflow in the low-speed area.

[0079] The first arc segment 121 is located on the side of the second arc segment 122 away from the high-speed ventilation portion 20, and the bending direction of the first arc segment 121 is the same as the bending direction of the second radial characteristic line 220 formed by the projection of the second radial rib 22 on the axial vertical plane of the grid structure. In this way, it is convenient to form a back-and-forth bending rotation direction through the second radial rib 22, the second arc segment 122 and the first arc segment 121 arranged in sequence, so as to better adapt to the flow direction of the airflow at different positions, facilitate better guidance of the airflow, facilitate better air discharge, and reduce the air discharge noise.

[0080] The first arc segment 121 and the second arc segment 122 are tangent to each other at the connection point to facilitate a smooth transition, thereby avoiding the influence of sudden changes in the structure on the airflow.

[0081] In this embodiment, the low-speed ventilation portion 10 further includes a third radial rib 13 . The third radial rib 13 is disposed between two adjacent first radial ribs 12 and is spaced apart from the two adjacent first radial ribs 12 .

[0082] The radial length of the third radial rib 13 in the grid structure is less than the radial length of the first radial rib 12 in the grid structure, so as to reduce production costs and better adapt to the airflow characteristics of the low-speed zone, and also to reduce resistance, increase air flow area, reduce material costs, and reduce noise. Specifically, the number of the first radial ribs 12 can be between 10 and 20, and the number of the third radial ribs 13 is set in one-to-one correspondence with the number of the first radial ribs 12.

[0083] The third radial rib 13 is located on the side of the low-speed ventilation part 10 close to the high-speed ventilation part 20, so as to effectively guide the higher-speed airflow on the side of the low-speed ventilation part 10 close to the high-speed ventilation part 20, adapt to the flow of the higher-speed airflow, and reduce noise.

[0084] like Figure 3As shown, in this embodiment, the low-speed ventilation part 10 has a third radial characteristic line 14 in the cross section along the axis of the grille structure, and the third radial characteristic line 14 is an arc connecting segment; the high-speed ventilation part 20 has a fourth radial characteristic line 23 in the cross section along the axis of the grille structure, and the fourth radial characteristic line 23 is a straight connecting segment. In this way, the third radial characteristic line 14 can facilitate the slow transition of the low-speed ventilation part 10 at a position close to the high-speed ventilation part 20, thereby avoiding the situation where the sudden change causes a greater impact on the airflow, and further reducing the situation where the noise caused by the greater impact of the airflow is greater.

[0085] Specifically, the length of the fourth radial characteristic line 23 may be (D2-D1) / 2, so as to better optimize the size of the fourth radial characteristic line 23, thereby facilitating better guiding of the outlet air.

[0086] In addition, by setting the fourth radial characteristic line 23 as a straight connecting segment, it is also convenient to reduce the situation where the axial dimension at the high-speed ventilation part 20 is too large, which is convenient for high-speed air discharge, reduces the high-speed air discharge resistance, and thus reduces noise. The above-mentioned straight connecting segment can be a direction completely perpendicular to the axial direction or a direction inclined at a predetermined angle to the axial direction, and the inclined direction can be an inclination at a small angle (between 0° and 30°). Preferably, the straight segment in this embodiment is completely perpendicular to the axial direction, so that the high-speed ventilation part 20 forms a flat structure, which is convenient for high-speed air discharge, reduces the air discharge resistance, and thus better reduces the air discharge noise.

[0087] Specifically, the arc connecting segment includes a third arc segment 141 and a fourth arc segment 142 that are connected to each other.

[0088] The bending directions of the third arc segment 141 and the fourth arc segment 142 are opposite to each other, so that the airflow can be effectively guided and directed through the third arc segment 141 and the fourth arc segment 142 to better discharge the air.

[0089] The third arc segment 141 and the fourth arc segment 142 are tangent at the connection, which facilitates a smooth transition between the third arc segment 141 and the fourth arc segment 142 at the connection and avoids a situation where the third arc segment 141 and the fourth arc segment 142 have large changes at the connection and affect the smooth flow of airflow.

[0090] In this embodiment, the maximum spacing between two adjacent second radial ribs 22 is t1, 9mm≤t1≤10.5mm; and / or the maximum spacing between two adjacent first annular ribs 11 is t2, 9mm≤t2≤10.5mm. By reasonably setting the values ​​of t1 and t2, the wind resistance and noise can be reduced as much as possible while ensuring that the grille meets the corresponding safety requirements.

[0091] In this embodiment, the projection of the second radial rib 22 on the axial vertical plane of the grid structure is a two-dimensional spiral; the curve of the two-dimensional spiral on the axial vertical plane should satisfy the following formula:

[0092] R = A + B * T, A = 0.5 * D1; B = 0.5 * (D2 - D1); β = ±(C + D * T), 0 ≤ T ≤ 1;

[0093] Wherein, R represents the radial distribution law of the curve, β represents the circumferential distribution law of the curve, A represents the starting position of the spiral in the R direction, B represents the radius increment of the starting point of the spiral in the R direction, C represents the initial phase of the spiral in the β direction, D represents the increment of the spiral in the β direction, D1 is the diameter corresponding to the projection of the inner side of the outer edge of the low-speed ventilation part 10 on the axial vertical plane, and D2 is the diameter corresponding to the projection of the inner side of the outer edge of the grid structure on the axial vertical plane. With such a setting, it is convenient to better optimize the shape of the second radial rib 22, so as to better guide through the second radial rib 22 and better reduce noise.

[0094] Specifically, C in this embodiment can be set to 90°. Considering that the array of radial rib bars is completely axisymmetric about the axis, the initial phase is not important. The value range of D is actually restricted by the value of t1. The larger D is, the longer the outer radial rib bar (corresponding to the second radial rib) is, and the greater the wind resistance is; when D is smaller, it is closer to the length of the radial straight line passing through the center of the circle (the straight line pointing from D1 to D2). Among them, the value range of D can be [0.01 * 360, 0.15 * 360].

[0095] Specifically, the projection of the first radial rib 12 on the axial vertical plane of the grid structure forms a first radial feature line 120, and the central angle corresponding to both ends of the first radial feature line 120 is α, 5° ≤ α ≤ 50°; and / or, the projection of the second radial rib 22 on the axial vertical plane of the grid structure forms a second radial feature line 220, and the central angle corresponding to both ends of the second radial feature line 220 is γ, 5° ≤ γ ≤ 25°. By setting within a reasonable parameter range, the outer high-speed rotating airflow can be combed through the high-density radial rib bars, making it more conform to the air outlet angle, and at the same time further enhancing the strength of the outer grid structure. Furthermore, the number of annular rib bars that do not match the airflow direction can be reduced, effectively reducing wind resistance and suppressing the noise radiation level.

[0096] The grid structure further includes an outer frame 30 and an inner cover 40. The outer frame 30 is arranged around the outer periphery of the high-speed ventilation part 20, and the width of the outer frame 30 in the axial direction of the grid structure is T1; the low-speed ventilation part 10 is arranged around the outer periphery of the inner cover 40, and the width of the inner cover 40 in the axial direction of the grid structure is T2, and T2 < T1. And the preferred range of T2 / T1 is [0.3, 0.5].

[0097] Such as Fig. 9As shown, the radial cross-section of the first radial rib 12 and / or the radial surface of the second radial rib 22 is a streamlined cross-section, which has an arc edge 51 facing the windward side and rib edges 52 respectively located on both sides of the arc edge 51, the radius corresponding to the arc edge 51 is r, and the length of the rib edge 52 is l.

[0098] Wherein, r=a+b*t, 0.5mm≤a≤1mm, 0.2mm≤b≤1mm, 0≤t≤1; and / or,

[0099] I=c+d*t, 4mm≤c≤7mm, 2mm≤d≤5mm, 0≤t≤1.

[0100] By setting appropriate parameter ranges of radial ribs (the radial ribs here refer to the first radial ribs 12 or the second radial ribs 22) and their variation patterns, the actual airflow direction at the fan blade outlet can be highly matched, impact losses can be effectively controlled, wind resistance can be reduced, air volume can be increased, and noise can be reduced at the same time.

[0101] The width of the streamlined section gradually increases from one end of the streamlined section close to the grid structure to the end of the streamlined section far from the grid structure, so as to adapt to the flow of airflow and facilitate guiding the airflow.

[0102] Specifically, the second radial rib 22 has a first radial section (corresponding to a streamlined section) at one end close to the first radial rib 12, and the second radial rib 22 has a second radial section (corresponding to a streamlined section) at one end away from the first radial rib 12; the first radial section has a first arc edge facing the windward side and first rib edges respectively located on both sides of the first arc edge, the radius corresponding to the first arc edge is r1, and the length of the first rib edge is l1; the second radial section has a second arc edge facing the windward side and second rib edges respectively located on both sides of the second arc edge, and the radius corresponding to the second arc edge is r2 , the length of the second rib side is l2; the first radial rib 12 has a third radial section at the end away from the second radial rib 22, and the first radial rib 12 has a fourth radial section at the end close to the second radial rib 22; the third radial section has a third arc side facing the windward side and third rib sides respectively located on both sides of the third arc side, the radius corresponding to the third arc side is r3, and the length of the third rib side is l3; the fourth radial section has a fourth arc side facing the windward side and fourth rib sides respectively located on both sides of the fourth arc side, the radius corresponding to the fourth arc side is r4, and the length of the fourth rib side is l4.

[0103] Among them, r2>r1; and / or, l2>l1; and / or, r4>r3; and / or, l4>l3.

[0104] By adopting such a size setting, by setting the appropriate parameter range of the first radial rib 12 and the second radial rib 22 and their variation rules, the actual airflow direction of the fan blade outlet can be highly fitted, the impact loss can be effectively controlled, the wind resistance can be reduced, the air volume can be increased, and the noise can be reduced.

[0105] like Fig. 9 As shown, the angle between the radial rib and the axial vertical plane of the grid structure is the installation angle θ. Specifically, θ can be understood as the angle between the symmetry axis of the radial rib (the two rib sides of the radial rib are symmetric with respect to the symmetry axis of the radial rib) and the axial vertical plane.

[0106] Specifically, when the radial rib is the second radial rib 22, the corresponding angle between the second radial rib 22 and the axial vertical plane of the grid structure is the first installation angle θ1; when the radial rib is the first radial rib 12, the angle between the first radial rib 12 and the axial vertical plane of the grid structure is the second installation angle θ2.

[0107] Specifically, the second radial rib 22 (corresponding to the outer grille) has a first installation angle θ1 with a vertical plane of the grille structure, 65°≤θ1≤85°. By setting a suitable radial rib parameter range and its variation rule, the actual airflow direction of the fan blade outlet can be highly matched, the impact loss can be effectively controlled, the wind resistance can be reduced, the air volume can be increased, and the noise can be reduced. Specifically, the distribution rule of the first installation angle is as follows: Fig.10 shown.

[0108] Specifically, there is a second installation angle θ2 between the first radial rib 12 (corresponding to the inner grille) and the axial vertical plane of the grille structure, 40°≤θ2≤80°. By setting a suitable radial rib parameter range and its variation law, the actual airflow direction of the fan blade outlet can be highly matched, the impact loss can be effectively controlled, the wind resistance can be reduced, the air volume can be increased, and the noise can be reduced. Specifically, the distribution law of the first installation angle is as follows: Fig.11 The test results of the grid structure provided in this embodiment are shown in Fig.12 and 13 shown.

[0109] According to another aspect of the present invention, an air conditioner outdoor unit is provided. The air conditioner outdoor unit comprises an outdoor unit housing and the grille structure provided in the above embodiment. An air outlet is arranged on the outdoor unit housing; and the grille structure is installed at the air outlet.

[0110] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: reduce the air volume attenuation amplitude induced by the air outlet grille of the air conditioner outdoor unit and suppress its high noise radiation level. Through the independent design of the new inner and outer double-layer grilles, the design of the axial distribution law of the grilles and the design of the variable swept section of the radial ribs, the required air volume is achieved with or without the grille: the air volume attenuation at the same speed is 3.32%, and the noise increase is about 2.2dB. The grille wind noise performance of the existing air conditioner outdoor unit is effectively improved.

[0111] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0112] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0113] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0114] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0115] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0116] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A grid structure, characterized in that: include: A low-speed ventilation portion (10) and a high-speed ventilation portion (20) connected to each other, wherein the high-speed ventilation portion (20) is arranged around the outer edge of the low-speed ventilation portion (10); the low-speed ventilation portion (10) comprises a plurality of first annular ribs (11) arranged at intervals along the radial direction of the grille structure and a plurality of first radial ribs (12) arranged at intervals along the circumferential direction of the grille structure, wherein the first radial ribs (12) are connected to the plurality of first annular ribs (11); the high-speed ventilation portion (20) comprises a plurality of second annular ribs (21) arranged at intervals along the radial direction of the grille structure and a plurality of second radial ribs (22) arranged at intervals along the circumferential direction of the grille structure, wherein the second radial ribs (22) are connected to the plurality of second annular ribs (21); The grille structure has a windward side and a leeward side that are arranged opposite to each other; on the windward side, the low-speed ventilation part (10) is arranged to protrude from the high-speed ventilation part (20).

2. The grid structure according to claim 1, characterized in that: The circumferential distribution density of the plurality of second radial ribs (22) is greater than the circumferential distribution density of the plurality of first radial ribs (12); and / or, The maximum distance between two adjacent second radial ribs (22) is smaller than the minimum distance between two adjacent first radial ribs (12); and / or, The projections of the outer edge of the grille structure and the outer edge of the low-speed ventilation portion (10) on the axial vertical plane of the grille structure are both circular, the projection of the inner side of the outer edge of the low-speed ventilation portion (10) on the axial vertical plane corresponds to a diameter D1, and the projection of the inner side of the outer edge of the grille structure on the axial vertical plane corresponds to a diameter D2, and 0.58≤D1 / D2≤0.

88.

3. The grid structure according to claim 1, characterized in that: The grille structure is arranged opposite to the fan blade, the plurality of second radial ribs (22) are bent along a preset direction, and the rotation direction formed by the plurality of second radial ribs (22) is the same as the rotation direction of the fan blade; and / or, The projection of the second radial rib (22) on the axial vertical plane of the grid structure forms a second radial characteristic line (220), and the second radial characteristic line (220) is a two-dimensional spiral line.

4. The grid structure according to claim 1, characterized in that: The projection of the first radial rib (12) on the axial vertical plane of the grid structure forms a first radial characteristic line (120), and the first radial characteristic line (120) includes a first arc segment (121) and a second arc segment (122) which are connected to each other; Wherein, the bending directions of the first arc segment (121) and the second arc segment (122) are opposite; and / or, The first arc segment (121) is located on a side of the second arc segment (122) away from the high-speed ventilation portion (20), and the bending direction of the first arc segment (121) is the same as the bending direction of a second radial characteristic line (220) formed by a projection of the second radial rib (22) on the axial vertical plane of the grid structure; The first arc segment (121) and the second arc segment (122) are tangent to each other at a connection point.

5. The grid structure according to claim 1, characterized in that: The low-speed ventilation portion (10) further comprises a third radial rib (13), wherein the third radial rib (13) is arranged between two adjacent first radial ribs (12) and is spaced apart from the two adjacent first radial ribs (12); Wherein, the radial length of the third radial rib (13) in the grid structure is smaller than the radial length of the first radial rib (12) in the grid structure; and / or, The third radial rib (13) is located on a side of the low-speed ventilation portion (10) close to the high-speed ventilation portion (20).

6. The grid structure according to claim 1, characterized in that: The low-speed ventilation portion (10) has a third radial characteristic line (14) in the cross section of the grille structure along the axis, and the third radial characteristic line (14) is an arc connecting segment; the high-speed ventilation portion (20) has a fourth radial characteristic line (23) in the cross section of the grille structure along the axis, and the fourth radial characteristic line (23) is a straight connecting segment.

7. The grid structure according to claim 6, characterized in that: The arc connecting segment comprises a third arc segment (141) and a fourth arc segment (142) connected to each other; Wherein, the bending directions of the third arc segment (141) and the fourth arc segment (142) are opposite; and / or, The third arc segment (141) and the fourth arc segment (142) are tangent to each other at a connection point.

8. The grid structure according to claim 1, characterized in that: The maximum distance between two adjacent second radial ribs (22) is t1, 9mm≤t1≤10.5mm; and / or, The maximum distance between two adjacent first annular ribs (11) is t2, 9mm≤t2≤10.5mm.

9. The grid structure according to claim 1, characterized in that: The projection of the second radial rib (22) on the axial vertical plane of the grid structure is a two-dimensional spiral line; the curve of the two-dimensional spiral line on the axial vertical plane should satisfy the following formula: R=A+B*T, A=0.5*D1; B=0.5*(D2-D1); β=±(C+D*T), 0≤T≤1; Among them, R represents the radial distribution law of the curve, β represents the circumferential distribution law of the curve, A represents the starting point position of the spiral line in the R direction, B represents the radius increment of the starting point of the spiral line in the R direction, C represents the initial phase of the spiral line in the β direction, D represents the increment of the spiral line in the β direction, D1 is the diameter corresponding to the projection of the inner side of the outer edge of the low-speed ventilation part (10) on the vertical plane of the axis, and D2 is the diameter corresponding to the projection of the inner side of the outer edge of the grille structure on the vertical plane of the axis.

10. The grid structure according to claim 1, characterized in that: The projection of the first radial rib (12) on the axial vertical plane of the grid structure forms a first radial characteristic line (120), and the central angle corresponding to the two ends of the first radial characteristic line (120) is α, 5°≤α≤50°; and / or, The projection of the second radial rib (22) on the axial vertical plane of the grid structure forms a second radial characteristic line (220), and the central angle corresponding to the two ends of the second radial characteristic line (220) is γ, 5°≤γ≤25°; and / or, The grille structure further comprises an outer frame (30) and an inner cover (40); the outer frame (30) is arranged around the outer periphery of the high-speed ventilation portion (20); the width of the outer frame (30) in the axial direction of the grille structure is T1; the low-speed ventilation portion (10) is arranged around the outer periphery of the inner cover (40); the width of the inner cover (40) in the axial direction of the grille structure is T2, and T2 <T1。 11. The grid structure according to claim 1, characterized in that: The radial cross section of the first radial rib (12) and / or the radial cross section of the second radial rib (22) is a streamlined cross section, wherein the streamlined cross section has an arc edge (51) facing the windward side and rib edges (52) located on both sides of the arc edge (51), the radius corresponding to the arc edge (51) is r, and the length of the rib edge (52) is l; Wherein, r=a+b*t, 0.5mm≤a≤1mm, 0.2mm≤b≤1mm, 0≤t≤1; and / or, l=c+d*t, 4mm≤c≤7mm, 2mm≤d≤5mm, 0≤t≤1; and / or, The width of the streamlined cross-section gradually increases from an end of the streamlined cross-section close to the grid structure to an end of the streamlined cross-section far from the grid structure.

12. The grid structure according to claim 1, characterized in that: The second radial rib (22) has a first radial cross section at an end close to the first radial rib (12), and the second radial rib (22) has a second radial cross section at an end away from the first radial rib (12); the first radial cross section has a first arc edge facing the windward side and first rib edges respectively located on both sides of the first arc edge, the radius corresponding to the first arc edge is r1, and the length of the first rib edge is l1; the second radial cross section has a second arc edge facing the windward side and second rib edges respectively located on both sides of the second arc edge, the radius corresponding to the second arc edge is r2, and the length of the second rib edge is l2; The first radial rib (12) has a third radial cross section at an end away from the second radial rib (22), and the first radial rib (12) has a fourth radial cross section at an end close to the second radial rib (22); the third radial cross section has a third arc edge facing the windward side and third rib edges respectively located on both sides of the third arc edge, the radius corresponding to the third arc edge is r3, and the length of the third rib edge is l3; the fourth radial cross section has a fourth arc edge facing the windward side and fourth rib edges respectively located on both sides of the fourth arc edge, the radius corresponding to the fourth arc edge is r4, and the length of the fourth rib edge is l4; Where r2>r1; and / or, l2>l1; and / or, r4>r3; and / or, l4>l3。 13. The grid structure according to claim 1, characterized in that: A first installation angle θ1 is formed between the second radial rib (22) and the axial vertical plane of the grid structure, 65°≤θ1≤85°; and / or, A second installation angle θ2 is formed between the first radial rib (12) and the axial vertical plane of the grid structure, and 40°≤θ2≤80°.

14. An air conditioner outdoor unit, characterized in that: include: An outdoor unit housing, wherein an air outlet is provided on the outdoor unit housing; The grille structure according to any one of claims 1 to 13, wherein the grille structure is installed at the air outlet.

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