Grille, outdoor unit and air conditioner

Abstract

The present application provides a grille, an outdoor unit, and an air conditioner. The grille includes an inner ring (1), an outer ring (2), radial ribs (3), and spiral ribs (4). One end of each radial rib (3) is connected to the inner ring (1), and the other end is connected to the outer ring (2). A plurality of radial ribs (3) are arranged at intervals along the circumferential direction of the outer ring (2). One end of the spiral rib (4) is connected to the inner ring (1), and the other end is connected to the outer ring (2). The spiral rib (4) spirally extends along the circumferential direction of the inner ring (1) and fixedly connects the radial ribs (3) together. According to the grille of the present application, the wind resistance of the ribs can be reduced, the discreteness of the air flow can be improved, the air volume can be increased, and the outlet air noise can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and particularly relates to a grille, an outdoor unit, and an air conditioner. Background Art

[0002] In modern life, the extensive use of air conditioners has, on the one hand, improved the comfort of people's lives, and on the other hand, brought great pressure to energy and the environment. Improving the performance of air conditioners and reducing their energy consumption as much as possible has always been one of the main research directions in the industry.

[0003] For safety considerations, existing air conditioner outdoor units are generally equipped with a protection device for children's fingers at the air outlet, that is, an air outlet grille. While the air outlet grille plays a role in safety protection and air guiding and rectifying, compared with the state without a grille at the outlet, it significantly reduces the air volume of the outdoor unit air duct and increases the aerodynamic noise of the outdoor unit. Therefore, the structural and performance optimization of the outlet grille plays an important role in the efficient and low-noise design of the entire air conditioner.

[0004] In current technologies, the shapes of outlet grilles are mainly divided into circular, square, and hybrid types, among which circular ones are the most widely used now. The circular grille includes a plurality of radial ribs radiating along the radius and circumferential ribs in concentric rings. The radial and circumferential ribs intersect with each other on the same plane and together with the end faces on both the inner and outer sides of the air outlet of the air conditioner outdoor unit form the windward surface and the air outlet surface.

[0005] However, when using a circular grille, the annular circumferential ribs will obstruct the air outlet of the air duct, resulting in a decrease in air volume and an increase in air outlet noise. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present application is to provide a grille, an outdoor unit, and an air conditioner that can reduce the wind resistance of the ribs, improve the discreteness of the air flow, increase the air volume, and reduce the air outlet noise.

[0007] To solve the above problems, the present application provides a grille, including an inner ring, an outer ring, radial ribs, and spiral ribs. One end of the radial rib is connected to the inner ring, and the other end is connected to the outer ring. A plurality of radial ribs are arranged at intervals along the circumferential direction of the outer ring. One end of the spiral rib is connected to the inner ring, and the other end is connected to the outer ring. The spiral rib extends spirally along the circumferential direction of the inner ring and fixedly connects the respective radial ribs together.

[0008] Preferably, there are two spiral ribs, and the two spiral ribs are centrosymmetric about the center of the inner ring.

[0009] Preferably, the number of spiral coils q of a single spiral rib satisfies 1 ≤ q ≤ 2.

[0010] Preferably, the helix diameter of the helical rib satisfies D2 ≤ D ≤ D1, where D2 is the outer circumferential diameter of the inner ring and D1 is the inner circumferential diameter of the outer ring.

[0011] Preferably, a disk is provided at the inner ring, and the disk blocks the inner hole of the inner ring.

[0012] Preferably, the cross-section of the radial rib is an airfoil cross-section.

[0013] Preferably, both the leading edge and the trailing edge of the airfoil cross-section are semi-circular. The diameter of the semi-circle at the leading edge is d1, and the diameter of the semi-circle at the trailing edge is d2, where 1.2 ≤ d1 / d2 ≤ 2.

[0014] Preferably, the angle between the chord line of the airfoil of the radial rib and the air outlet axis is α, where 18° ≤ α ≤ 25°.

[0015] Preferably, the length of the helical rib between two adjacent radial ribs is s, and the chord length of the radial rib at this section of the helical rib is c, where 0.8 ≤ c / s ≤ 1.7.

[0016] According to another aspect of the present application, an outdoor unit is provided, including a grille, and the grille is the above-mentioned grille.

[0017] According to another aspect of the present application, an air conditioner is provided, including a grille, and the grille is the above-mentioned grille.

[0018] The grille provided by the present application includes an inner ring, an outer ring, radial ribs and helical ribs. One end of the radial rib is connected to the inner ring, and the other end is connected to the outer ring. A plurality of radial ribs are arranged at intervals along the circumferential direction of the outer ring. One end of the helical rib is connected to the inner ring, and the other end is connected to the outer ring. The helical rib extends spirally along the circumferential direction of the inner ring and fixedly connects the radial ribs together. The circumferential ribs of this grille use helical ribs in the shape of a helix to replace the circumferential ribs in the prior art, and can utilize the characteristics of variable diameter and continuity of the helix to reduce the obstruction of the distribution structure characteristics of the circumferential ribs to the air flow, form the discreteness of the air flow impact, thereby reducing the wind resistance of the circumferential ribs in the circumferential direction of the grille, optimizing the arrangement structure of the circumferential ribs and the radial ribs, increasing the air volume, and reducing the outlet air noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a structural diagram of the grille according to the embodiment of the present application;

[0020] Figure 2 is Figure 1 an enlarged structural schematic diagram of part A;

[0021] Figure 3 is Figure 1 a sectional structural schematic diagram taken along the line B-B of

[0022] Figure 4 The semi-sectional three-dimensional structure diagram of the grille according to the embodiment of the present application;

[0023] Figure 5 is Figure 4 The enlarged structure diagram of the C position of;

[0024] Figure 6 The air volume comparison diagram of the outdoor unit with the grille according to the embodiment of the present application and the existing outdoor unit at the same rotational speed;

[0025] Figure 7 The noise comparison diagram of the outdoor unit with the grille according to the embodiment of the present application and the existing outdoor unit at the same wind speed.

[0026] The reference numerals are shown as:

[0027] 1, inner ring; 2, outer ring; 3, radial rib; 4, spiral rib; 5, disc. Detailed implementation manners

[0028] With reference to Figures 1 to 7 As shown, according to the embodiment of the present application, the grille includes an inner ring 1, an outer ring 2, radial ribs 3 and spiral ribs 4. One end of the radial rib 3 is connected to the inner ring 1, and the other end is connected to the outer ring 2. A plurality of radial ribs 3 are arranged at intervals along the circumferential direction of the outer ring 2. One end of the spiral rib 4 is connected to the inner ring 1, and the other end is connected to the outer ring 2. The spiral rib 4 spirally extends along the circumferential direction of the inner ring 1 and fixedly connects the radial ribs 3 together.

[0029] The circumferential ribs of the grille adopt spiral ribs 4 with a spiral shape instead of the circumferential ribs in the prior art, and can utilize the characteristics of the variable diameter and continuity of the spiral line of the spiral rib 4 to reduce the obstruction of the distribution structure characteristics of the circumferential ribs to the air flow, form the discreteness of the air flow impact, thereby reducing the wind resistance of the circumferential ribs in the circumferential direction of the grille, optimizing the arrangement structure of the circumferential ribs and the radial ribs 3, increasing the air volume, and reducing the outlet noise.

[0030] Preferably, in this embodiment, there are two spiral ribs 4, and the two spiral ribs 4 are centrosymmetric about the center of the inner ring 1.

[0031] In other embodiments, the spiral rib 4 in the present application can also be a single spiral rib or a triple spiral rib, or more ribs by adjusting the pitch, number of turns and diameter of the spiral line.

[0032] Compared with the single spiral rib, the double spiral rib can not only ensure that the rib gap size meets the safety requirements of fingers, but also make the density of the spiral rib 4 appropriate, without excessively increasing the air outlet resistance of the grille, and can achieve the balance between the safety of the grille and the air outlet resistance.

[0033] In addition, the use of double spiral ribs not only improves the overall balance of the grille, but also the centrally symmetrical structure can make the air outlet of the double spiral ribs smoother, and the fixing connection effect of the radial ribs 3 is also more balanced, which can better reduce the wind resistance of the grille in the circumferential direction and further improve the discreteness of the airflow.

[0034] In this embodiment, the number q of spiral coils of a single spiral rib 4 satisfies 1≤q≤2. Wherein q can be an integer or a decimal, and the design is relatively flexible, which can ensure that the spiral rib 4 has sufficient connection strength with the radial rib 3, and at the same time ensure that the density of the spiral rib 4 is more reasonable and the structural performance is better.

[0035] The spiral line diameter of the spiral rib 4 satisfies D2≤D≤D1, where D2 is the outer circumference diameter of the inner ring 1, and D1 is the inner circumference diameter of the outer ring 2. Since the inner end of the spiral rib 4 is connected to the outer circumference wall of the inner ring 1, and the outer end is connected to the inner circumference wall of the outer ring 2, and the diameter of the spiral rib 4 gradually increases from the inner end to the outer end, it is ensured that the spiral line diameter D2 of the spiral rib 4 is greater than the outer circumference diameter of the inner ring 1 and smaller than the inner circumference diameter of the outer ring 2, so that a good arc transition structure can be formed between the spiral rib 4 and the inner ring 1 and the outer ring 2, avoiding the problem of structural mutation at the connection position caused by unreasonable diameter design, ensuring the smooth flow of airflow, and being more conducive to reducing noise.

[0036] Preferably, a disc 5 is provided at the inner ring 1, and the disc 5 blocks the inner hole of the inner ring 1. The disc 5 can block the inner hole of the inner ring 1 to avoid safety omissions here, and further improve the safety of the grille when in use.

[0037] At present, air conditioner outdoor units generally use 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 a circumferential and radial rotation angle. The traditional grille design takes into account aspects such as air output and demolding, and the circumferential radial bars are rarely modified. Most of them are designed as radial ribs with variable angles to cater to the radial rotation angle of the airflow to reduce the grille wind resistance. The circumferential grille wind resistance has not been well improved. The present application replaces the original circumferential ribs with a double helical rib design, and reduces the number of circumferential ribs by using the variable diameter of the spiral line. At the same time, it improves the discreteness of the airflow, reduces the wind resistance in the circumferential direction, increases the axial air volume, and reduces the aerodynamic noise. Figure 6 , Figure 7 shown.

[0038] The grille of the present application is particularly suitable for an air outlet grille.

[0039] The cross-section of the radial rib 3 is an airfoil cross-section. In this application, the cross-section of the radial rib 3 is optimized to be airfoil-shaped, thereby improving the structural characteristics of the radial rib 3. When the air flows through the radial rib 3, the windward angle of the radial leading edge conforms to the airflow angle at the outlet of the wind blade, reducing the radial resistance. The diffuser design with a contracted radial tail reduces the air velocity and increases the static pressure. The radial rib 3 drives the airflow to tilt in the opposite direction of the circumferential velocity, causing the swirling velocity of the airflow at the grille outlet to be less than that at the inlet, converting the circumferential rotational kinetic energy of the wind blade into axial kinetic energy, increasing the axial flow air volume, and reducing the aerodynamic noise.

[0040] The leading edge of the airfoil rib has a larger size, which can reduce the frontal wind resistance. It gradually tapers from the leading edge to the trailing edge, and the trailing edge has a smaller size. Both the leading and trailing edges are smooth arcs. Since the airfoil size shrinks from the leading edge to the trailing edge, the spacing between adjacent airfoils becomes larger, which plays a role in reducing the air velocity and increasing the air pressure.

[0041] Both the leading edge and the trailing edge of the airfoil cross-section are semi-circular. The diameter of the semi-circle at the leading edge is d1, and the diameter of the semi-circle at the trailing edge is d2, where 1.2 ≤ d1 / d2 ≤ 2, which can ensure the natural transition of the airfoil, further reduce the air flow resistance, and increase the axial flow air volume. In this embodiment, on the airfoil cross-section, both ends are semi-circular, and the two semi-circles are connected by a smooth curve, and the smooth curve is smoothly transitioned and connected to the semi-circles at the leading edge and the trailing edge.

[0042] The angle between the airfoil chord line of the radial rib 3 and the air outlet axis is α, where 18° ≤ α ≤ 25°, so that the design of the airfoil chord line can be associated with the air outlet axis, ensuring a good match between the structure of the radial rib 3 and the air outlet axis, optimizing the air outlet of the grille, further reducing the air outlet resistance of the grille, and reducing the air outlet noise.

[0043] The length of the spiral rib 4 between two adjacent radial ribs 3 is s, and the chord length of the radial rib 3 at this section of the spiral rib 4 is c, where 0.8 ≤ c / s ≤ 1.7. This structure can maintain a reasonable ratio relationship, effectively control the shape of the flow channel between adjacent radial ribs, improve the flow state in the flow channel, avoid the occurrence of flow separation on the rib surface, and can significantly reduce the aerodynamic noise.

[0044] According to an embodiment of the present application, the outdoor unit includes a grille, and the grille is the above-mentioned grille.

[0045] According to an embodiment of the present application, the air conditioner includes a grille, and the grille is the above-mentioned grille.

[0046] It is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned advantageous ways can be freely combined and superimposed.

[0047] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application. The above is only the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present application, several improvements and variations can also be made, and these improvements and variations should also be regarded as within the protection scope of the present application.

Claims

1. A grille, characterized in that, The grille is an air outlet grille, including an inner ring (1), an outer ring (2), radial ribs (3) and spiral ribs (4). One end of the radial rib (3) is connected to the inner ring (1), and the other end is connected to the outer ring (2). A plurality of the radial ribs (3) are arranged at intervals along the circumferential direction of the outer ring (2). One end of the spiral rib (4) is connected to the inner ring (1), and the other end is connected to the outer ring (2). The spiral rib (4) spirally extends along the circumferential direction of the inner ring (1) and fixedly connects the radial ribs (3) together; There are two spiral ribs (4). The two spiral ribs (4) are centrosymmetric about the center of the inner ring (1), and the spiral lines of the two spiral ribs (4) are arranged with variable diameters. In the direction from the inner end to the outer end of the spiral rib (4), the diameter between adjacent spiral lines of the spiral rib (4) gradually increases; The cross-section of the radial rib (3) is an airfoil cross-section. The leading edge and the trailing edge of the airfoil cross-section are both semi-circular. The diameter of the leading-edge semi-circle is d1, and the diameter of the trailing-edge semi-circle is d2, where 1.2 ≤ d1 / d2 ≤ 2. The angle between the airfoil chord line of the radial rib (3) and the air outlet axis is α, where 18° ≤ α ≤ 25°. When the air flow passes through the radial rib (3), the windward angle of the leading edge conforms to the air flow angle at the outlet of the wind blade, and the structure gradually converges from the leading edge to the trailing edge.

2. The grille according to claim 1, wherein, The number of spiral turns q of a single spiral rib (4) satisfies 1 ≤ q ≤ 2.

3. The grille according to claim 1, characterized in that, The spiral line diameter of the spiral rib (4) satisfies D2 ≤ D ≤ D1, where D2 is the outer circumferential diameter of the outer ring (2), and D1 is the inner circumferential diameter of the inner ring (1).

4. The grille according to claim 1, characterized in that, A disc (5) is provided at the inner ring (1), and the disc (5) blocks the inner hole of the inner ring (1).

5. The grid according to claim 1, characterized in that, The length of the spiral rib (4) between two adjacent radial ribs (3) is s, and the chord length of the radial rib (3) at this section of the spiral rib (4) is c, where 0.8 ≤ c / s ≤ 1.

7.

6. An outdoor unit, comprising a grille, characterized in that, The grille is the grille according to any one of claims 1 to 5.

7. An air conditioner, comprising a grille, characterized in that, The grille is the grille according to any one of claims 1 to 5.

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