Top air outlet type air conditioner outdoor unit

Abstract

The utility model discloses a top air outlet type air conditioner outdoor unit, and relates to the technical field of air conditioners. The top air outlet type air conditioner outdoor unit comprises a machine shell, an outdoor heat exchanger, a compressor and an outdoor fan. The outdoor fan comprises a hub and blades arranged on the peripheral face of the hub. Each blade comprises a blade root, a blade top, a front edge and a rear edge; the blade root is connected with the hub; the blade top is radially far away from the hub relative to the blade root; the front edge is located at the front end of the blade rotation direction and connected with the blade top and the blade root. The tail edge is located at the rear end of the blade rotation direction and connected with the blade top and the blade root. The trailing edge is limited to form a trailing edge contour line; the trailing edge profile curve comprises a first bent part and a second bent part, the first bent part protrudes towards the side away from the leading edge, and the second bent part sinks towards the side close to the leading edge, so that a noise reduction notch is formed; and the first bent part and the second bent part are connected in sequence. According to the top air outlet type air conditioner outdoor unit, the blade tail edge shape and / or the blade shape are / is optimized, so that noise generated when the fan operates is reduced.

Description

Technical Field

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

[0002] The fan is an important part of the indoor unit of the air conditioner. It plays an important role in the normal operation and energy efficiency of the outdoor unit of the air conditioner. The fan drives the air to circulate through the surface of the outdoor unit heat exchanger to achieve air heat exchange. The operation of the fan can also speed up the heat exchange efficiency between the air and the radiator. The fan is easy to generate noise when it is running. Although the outdoor unit of the air conditioner is usually placed outdoors, the noise generated by the fan when it is running may pass through the walls and windows into the room, affecting the normal life of the user.

[0003] In the outdoor unit of a top-discharge air conditioner, the fan is usually an axial flow fan, which includes a hub and a number of blades arranged on the hub. During the rotation of the blades, the blades interact with the surrounding air through their specific shape and movement to generate a continuous airflow. This airflow not only has speed, but also has a certain directionality. During the rotation of the blades with the hub, there is a strong trembling vibration phenomenon, which in turn causes the vibration of the entire axial flow fan and generates a lot of noise. The shape of the trailing edge and the shape of the blades are important factors affecting the noise of the axial flow fan. Although many optimization designs have been made for the shape of the trailing edge and the shape of the blades in the prior art, the shape of the trailing edge and the shape of the blades still cannot meet the noise reduction requirements of the outdoor unit of the top-discharge air conditioner.

[0004] In view of this, this application is filed. Utility Model Content

[0005] In view of the deficiencies existing in the related art, the present application provides a top-discharge air-conditioning outdoor unit, which optimizes the shape of the blade trailing edge and / or the blade shape to reduce the noise generated when the fan is running.

[0006] The present application provides a top-outlet air-conditioning outdoor unit, comprising:

[0007] The casing comprises a casing air outlet and a casing air inlet, wherein the casing air outlet is arranged at the top of the casing, and the casing air inlet is arranged at the outer periphery of the casing;

[0008] An outdoor heat exchanger is arranged inside the casing, and the outdoor heat exchanger is arranged close to the air inlet of the casing;

[0009] A compressor is disposed inside the casing;

[0010] An outdoor fan is arranged inside the casing and near the air outlet of the casing; at least a part of the outdoor fan is located above the compressor, and the outdoor fan includes a hub and blades arranged on the outer peripheral surface of the hub;

[0011] The blades include:

[0012] The blade root is connected to the wheel hub;

[0013] The blade tip is arranged radially away from the hub relative to the blade root;

[0014] The leading edge is located at the front end of the blade in the direction of rotation and connects the blade tip and the blade root;

[0015] The trailing edge is located at the rear end of the blade in the direction of rotation and connects the blade tip and the blade root;

[0016] The trailing edge is limited to form a trailing edge contour line, which is set in the direction from the blade root to the blade top; the trailing edge contour curve includes a first bend and a second bend, the first bend is convex to the side away from the leading edge, and the second bend is concave toward the side close to the leading edge to form a noise reduction gap; the first bend is connected to the second bend in sequence.

[0017] This technical solution designs the trailing edge contour line to include a first bend and a second bend, so that the first bend and the second bend are interconnected to form multiple arcs. Compared with regular curve structures such as straight line structures or circular arc structures, this can reduce the shedding of blade wake vortices, reduce noise, and thus reduce the noise of the entire fan.

[0018] In some of the embodiments, the second bend is provided as at least two second bends, the two second bends are distributed along a direction from the blade root to the blade tip; and the two second bends are connected to each other through the first bend.

[0019] In some of the embodiments, the second curved portion is disposed close to the blade tip and / or the blade root, and the first curved portion is disposed away from the blade tip and the blade root.

[0020] In addition, the present application also provides a top-outlet air-conditioning outdoor unit, comprising:

[0021] The casing comprises a casing air outlet and a casing air inlet, wherein the casing air outlet is arranged at the top of the casing, and the casing air inlet is arranged at the outer periphery of the casing;

[0022] An outdoor heat exchanger is arranged inside the casing, and the outdoor heat exchanger is arranged close to the air inlet of the casing;

[0023] A compressor is disposed inside the casing;

[0024] An outdoor fan is arranged inside the casing and near the air outlet of the casing; at least a part of the outdoor fan is located above the compressor, and the outdoor fan includes a hub and blades arranged on the outer peripheral surface of the hub;

[0025] The blades include:

[0026] The blade root is connected to the hub; the length of the projection curve of the contour line of the blade root in the horizontal plane is L1;

[0027] The blade tip is arranged radially away from the hub relative to the blade root; the length of the projection curve of the contour line of the blade tip in the horizontal plane is L2;

[0028] A cylindrical surface which is concentric with the hub, has a radius of R and extends along the axis of the hub is defined as a cross section;

[0029] The blade and the cross section together define a cross-sectional curve, and the length L of a projection curve of the cross-sectional curve in a horizontal plane satisfies the relationship: L≥L1, L≤L2.

[0030] The technical solution optimizes the design of the blade shape to reduce the noise generated when the fan is running.

[0031] In some embodiments, if the cross-sectional curve includes at least two arc curves, the radius R and the radius r1 of the hub satisfy the relationship: R≥2.26r1; if the cross-sectional curve includes at most one arc curve, the radius R and the radius r1 of the hub satisfy the relationship: R≤2.76r1.

[0032] In some embodiments, if the cross-sectional curve includes at least two circular arc curves, the radius R and the radius r2 of the projection curve of the blade top contour line in the horizontal plane satisfy the relationship: R≥0.58r2; if the cross-sectional curve includes at most one circular arc curve, the radius R and the radius r2 satisfy the relationship: R≤0.7r2.

[0033] In some embodiments, the cross-section includes a first cross-section and a second cross-section, the radius of the first cross-section is R1, and the radius of the second cross-section is R2; the blade and the first cross-section together define a first cross-section curve, and the blade and the second cross-section together define a second cross-section curve; if the second cross-section curve includes at least two circular arc curves and the first cross-section curve includes at most one circular arc curve, then the radius R2 and the radius R1 satisfy the relationship: R2>R1.

[0034] In some embodiments, if the height H1 of the projection curve of the first cross-sectional curve in the vertical plane and the height H2 of the projection curve of the second cross-sectional curve in the vertical plane satisfy the relationship: H2>H1, then the radius R2 and the radius R1 satisfy the relationship: R2>R1.

[0035] In some embodiments, if the length L of the projection curve of the first cross-sectional curve in the horizontal plane and the length L3 of the projection curve of the second cross-sectional curve in the horizontal plane satisfy the relationship: L3>L, then the radius R2 and the radius R1 satisfy the relationship: R2>R1.

[0036] In some of the embodiments, the blade is provided with a reinforcing rib, which is arranged on a pressure surface of the blade protruding from the blade; the reinforcing rib extends from the leading edge to the trailing edge, and the reinforcing rib is bent in a direction away from the blade root.

[0037] The technical solution increases the strength of the blades by setting reinforcing ribs; by extending the reinforcing ribs in the direction from the leading edge to the trailing edge and bending the reinforcing ribs away from the blade root, the influence of the reinforcing ribs on the airflow is reduced, thereby avoiding an increase in noise when the fan is running due to the setting of reinforcing ribs on the blades.

[0038] In the above embodiment, a top-outlet air-conditioning outdoor unit improves and optimizes the trailing edge shape and / or blade shape of the blade, designs the trailing edge contour curve into multiple arc curves, and avoids serious flow separation on the blade surface to form vortices; under the premise of keeping the blade speed unchanged, the fan air volume and air pressure can be increased, thereby reducing the noise generated when the fan is running; or, under the premise of keeping the fan air volume the same, the blade speed can be reduced, thereby reducing the noise generated when the fan is running. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the structure of an embodiment of a top-outlet air-conditioning outdoor unit of the present application. Figure 1 ;

[0040] Figure 2 This is a schematic diagram of the structure of an embodiment of a top-outlet air-conditioning outdoor unit of the present application. Figure 2 ;

[0041] Figure 3 This is a schematic structural diagram of an embodiment of a top-outlet air-conditioning outdoor unit of the present application when a fan cover is not assembled;

[0042] Figure 4 It is a structural schematic diagram of an embodiment of a top-outlet air-conditioning outdoor unit of the present application when a top cover, a fan cover and an electric control box are not assembled;

[0043] Figure 5 It is a structural schematic diagram of the top cover and the heat exchange fan when assembled in one embodiment of the top-outlet air-conditioning outdoor unit of the present application;

[0044] Figure 6 It is a structural schematic diagram of an outdoor fan in one embodiment of a top-outlet air-conditioning outdoor unit of the present application;

[0045] Figure 7 It is a structural schematic diagram of an outdoor fan from another angle in one embodiment of a top-outlet air-conditioning outdoor unit of the present application;

[0046] Figure 8 This is a schematic diagram of the structure of the fan blades in one embodiment of the top-outlet air-conditioning outdoor unit of the present application;

[0047] Fig. 9 This is a schematic diagram of a fan blade cut in a cross section of an embodiment of a top-outlet air-conditioning outdoor unit of the present application. Figure 1 ;

[0048] Fig.10This is a schematic diagram of a fan blade cut in a cross section of an embodiment of a top-outlet air-conditioning outdoor unit of the present application. Figure 2 ;

[0049] Fig.11 This is a schematic diagram of the dimensions of the fan blades in one embodiment of the top-outlet air-conditioning outdoor unit of the present application;

[0050] Fig.12 It is a schematic diagram of the dimensions of a cross-sectional curve when the cross-sectional radius is 585 mm in one embodiment of a top-outlet air-conditioning outdoor unit of the present application;

[0051] Fig.13 It is a schematic diagram of the dimensions of a cross-sectional curve when the cross-sectional radius is 500 mm in one embodiment of a top-outlet air-conditioning outdoor unit of the present application;

[0052] Fig.14 It is a schematic diagram of the dimensions of a cross-sectional curve when the cross-sectional radius is 414 mm in one embodiment of a top-outlet air-conditioning outdoor unit of the present application;

[0053] Fig.15 It is a schematic diagram of the dimensions of a cross-sectional curve when the cross-sectional radius is 340 mm in one embodiment of a top-outlet air-conditioning outdoor unit of the present application;

[0054] Fig.16 It is a schematic diagram of the dimensions of a cross-sectional curve when the cross-sectional radius is 260 mm in one embodiment of a top-outlet air-conditioning outdoor unit of the present application;

[0055] Fig.17 It is a schematic diagram of the dimensions of a cross-sectional curve when the cross-sectional radius is 188 mm in an embodiment of a top-outlet air-conditioning outdoor unit of the present application.

[0056] In the figure,

[0057] 100, housing; 200, fan cover; 300, electric control box; 400, outdoor fan; 500, drive motor; 600, compressor; 700, outdoor heat exchanger;

[0058] 101. Air outlet of the casing; 102. Air inlet of the casing;

[0059] 110, top cover; 120, side panel; 130, chassis;

[0060] 111. Air guide ring;

[0061] 410, blade; 420, hub; 430, reinforcing rib; 440, recess;

[0062] 411, blade root; 412, blade tip; 413, trailing edge; 414, leading edge;

[0063] 4131. First bend; 4132. Second bend; 4133. Noise reduction notch. DETAILED DESCRIPTION

[0064] In order to make the purpose and implementation method of the present application clearer, the exemplary implementation method of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0065] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.

[0066] The terms "first", "second", "third", etc. in the specification and claims of this application and the above drawings are used to distinguish similar or similar objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise noted. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances.

[0067] The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to all the components expressly listed but may include other components not expressly listed or inherent to such product or device.

[0068] The top-outlet air-conditioning outdoor unit provided in the embodiments of the present application may have various implementation forms. Figure 1-Figure 17 It is a specific implementation of the top-outlet air-conditioning outdoor unit of the present application.

[0069] like Figure 1 and Figure 2 As shown, the top-outlet air-conditioning outdoor unit provided in the present application includes a casing 100, and the casing 100 is used to form the overall appearance of the air-conditioning outdoor unit; the top of the casing 100 and the bottom of the casing 100 are opposite ends, and the height direction of the casing 100 is from the bottom of the casing 100 to the top of the casing 100; the left side of the casing 100 and the right side of the casing 100 are opposite sides, and the length direction of the casing 100 is from the left side of the casing 100 to the right side of the casing 100; the front side of the casing 100 and the rear side of the casing 100 are opposite sides, and the thickness direction of the casing 100 is from the front side of the casing 100 to the rear side of the casing 100.

[0070] like Figure 3 As shown, the casing 100 includes a casing air outlet 101 , which is disposed at the top of the casing 100 , and the air inside the casing 100 is output to the outdoors through the casing air outlet 101 .

[0071] In some embodiments, the opening of the housing air outlet 101 is arranged to face upward.

[0072] The casing 100 includes a casing air inlet 102 . The casing air inlet 102 is disposed at the outer periphery of the casing 100 , and outdoor air enters the casing 100 through the casing air inlet 102 .

[0073] In some embodiments, the opening direction of the casing air inlet 102 is arranged to intersect with the opening direction of the casing air outlet 101 .

[0074] like Figure 1-Figure 3 As shown, the housing 100 includes a top cover 110 , which is located at the top of the housing 100 , and a housing air outlet 101 is opened in the top cover 110 .

[0075] In some embodiments, the air outlet 101 of the housing is circular in opening direction and is disposed in the middle portion of the top cover 110 .

[0076] like Figure 1-Figure 4 As shown, the housing 100 includes a side panel 120 , which is connected to the top cover 110 . The side panel 120 is located below the top cover 110 , and the housing air inlet 102 is opened on the side panel 120 .

[0077] In some embodiments, the top cover 110 is detachably connected to the side panel 120 by means of bolts, screws or other components.

[0078] like Figure 1-Figure 4 As shown, the housing 100 includes a bottom plate 130, which is disposed below the side plate 120. The bottom plate 130 and the top cover 110 are disposed correspondingly along the height direction of the housing 100, and the bottom plate 130, the side plate 120 and the top cover 110 jointly define a receiving cavity. The receiving cavity is used to receive components such as an outdoor heat exchanger 700, a compressor 600 and a fan 400 disposed inside the housing 100; wherein the housing air inlet 102 and the housing air outlet 101 are respectively connected to the receiving cavity.

[0079] In some embodiments, the bottom plate 130 is a rectangular structure with cut corners, and the housing 100 is a substantially cubic structure.

[0080] like Figure 1-Figure 3 As shown, the top-outlet air-conditioning outdoor unit includes an electric control box 300, which is mounted on the housing 100 and located outside the accommodating cavity. The electric control box 300 is arranged above the cut corner of the chassis 130. The electric control box 300 is provided with electrical components required for the operation of the air-conditioning outdoor unit, which belongs to the prior art in the field and will not be described in detail.

[0081] like Figure 4As shown, the top-outlet air-conditioning outdoor unit includes an outdoor heat exchanger 700 , which is disposed inside the casing 100 and is used to exchange heat for air passing through the outdoor heat exchanger 700 ; the outdoor heat exchanger 700 is disposed close to the casing air inlet 102 , and the outdoor heat exchanger 700 is installed on the chassis 130 .

[0082] like Figure 4 As shown, the top-outlet air-conditioning outdoor unit includes a compressor 600, which is arranged inside the casing 100 and mounted on the chassis 130. The compressor 600 is used to compress the refrigerant in a low-temperature and low-pressure state into a high-temperature and high-pressure state. The compressor 600, the outdoor heat exchanger 700 and the indoor heat exchanger together form a refrigerant circulation loop, and the refrigerant flows in the refrigerant circulation loop to achieve cooling or heating of the indoor environment by the air conditioner.

[0083] The compressor 600 is arranged in the middle part of the chassis 130, and the outdoor heat exchanger 700 is arranged at the outer edge part of the chassis 130. The outdoor heat exchanger 700 is arranged around the outer periphery of the compressor 600. On the one hand, the area of ​​the outdoor heat exchanger 700 can be increased, and the heat exchange effect of the outdoor heat exchanger 700 can be increased; on the other hand, the outdoor heat exchanger 700 can be arranged close to the air inlet 102 of the casing, so that the air entering the casing 100 can contact the outdoor heat exchanger 700 in time, thereby increasing the heat exchange effect of the outdoor heat exchanger 700.

[0084] like Figure 3 As shown, the top-outlet air conditioner outdoor unit includes a fan 400, which is located in the accommodating cavity and is arranged near the housing air outlet 101. Through the operation of the fan 400, outdoor air enters the accommodating cavity through the housing air inlet 102, contacts the outdoor heat exchanger 700, and is output to the outdoors through the housing air outlet 101.

[0085] In some embodiments, the fan 400 is an axial flow fan, and the fan 400 and the housing air outlet 101 are disposed correspondingly along the height direction of the housing 100 .

[0086] In some embodiments, the fan 400 is located below the air outlet 101 of the casing.

[0087] In some embodiments, the compressor 600 is located below the fan 400 so that the fan 400 can be disposed close to the air outlet 101 of the casing.

[0088] like Figure 5 As shown, the top cover 110 is connected to an air guide ring 111, which is arranged at the air outlet 101 of the casing; the interior of the air guide ring 111 defines a through cavity extending along the height direction of the casing 100, and at least part of the fan 400 is located in the through cavity. The air guide ring 111 is used to guide the air flow in the accommodating cavity so that the fan 400 can better play the role of inducing wind.

[0089] like Figure 1 and Figure 2 As shown, the top-outlet air-conditioning outdoor unit includes a fan cover 200, which is disposed at the air outlet 101 of the housing and mounted on the top cover 110. The fan cover 200 is used to provide protection for the fan 400 and the blades 410 to prevent damage to the fan 400 or accidental injury caused by inhalation of indoor debris. The fan cover 200 can also concentrate and evenly guide the wind flow, making the air flow blown out by the fan 400 more concentrated and even.

[0090] like Figure 3 As shown, the top-outlet air-conditioning outdoor unit includes a driving motor 500, which is used to drive the fan 400 to rotate; the driving motor 500 is installed on the fan cover 200, and the driving motor 500 is located below the fan cover 200; the rotating shaft of the driving motor 500 is set downward.

[0091] like Figure 6 and Figure 7 As shown, the fan 400 includes blades 410, and the blades 410 are used to promote air flow. The blades 410 are usually arranged in a plurality, and the plurality of blades 410 are distributed in a circumference.

[0092] like Figure 6 and Figure 8 As shown, the blade 410 is provided with a reinforcing rib 430 , and the reinforcing rib 430 is arranged to protrude from the pressure surface of the blade 410 ; by providing the reinforcing rib 430 , the strength of the blade 410 is increased.

[0093] In some embodiments, Figure 7 As shown, the middle portion of the blade 410 is convex toward the pressure surface of the blade 410 to form a reinforcing rib 430 on the pressure surface of the blade 410 and a concave portion 440 on the leeward surface of the blade 410 , and the reinforcing rib 430 is matched with the concave portion 440 .

[0094] In other embodiments, the blade 410 is formed with the reinforcing rib 430 by stamping to simplify the production method of the reinforcing rib 430 .

[0095] The fan 400 includes a hub 420, which is used to mount blades 410. One end of the blade 410 is connected to the hub 420, and the other end of the blade 410 extends in a direction away from the hub 420. Multiple blades 410 are distributed along the circumference of the hub 420. The hub 420 is connected to the rotating shaft of the driving motor 500 so that the driving motor 500 drives the blades 410 to rotate through the hub 420.

[0096] In the current embodiment, the number of the blades 410 is three, and the output shaft of the driving motor 500 is connected to the hub 420 to drive the hub 420 to rotate, thereby driving the blades 410 to rotate.

[0097] In some embodiments, the hub 420 includes a connecting portion 421 , which is located at an outer edge of the hub 420 , and the connecting portion 421 is connected to the blades 410 .

[0098] It should be noted that the connection parts 421 are arranged in a one-to-one correspondence with the blades 410 , and the number of the connection parts 421 is the same as the number of the blades 410 .

[0099] like Figure 8 As shown, the blade 410 includes a blade root 411 , which is connected to the hub 420 ; the blade root 411 defines a blade root contour line, and the length of a projection curve of the blade root contour line in a horizontal plane is L1 .

[0100] The blade 410 includes a blade tip 412 , which is arranged radially away from the hub 420 relative to the blade root 411 ; the blade tip 412 defines a blade tip contour line, and the length of the projection curve of the blade tip contour line in the horizontal plane is L2 .

[0101] L2 and L1 satisfy the relationship: L2>L1, so as to reduce the air resistance of the blade 410 when it is running.

[0102] The blade 410 includes a leading edge 414 . The leading edge 414 is located at the front end of the blade 410 in the rotation direction and connects the blade tip 412 and the blade root 411 .

[0103] A sharp angle is provided on one side of the leading edge 414 close to the blade top 412, and the sharp angle design can reduce the contact area between the leading edge 414 and the air, thereby reducing air resistance. When the blade 410 rotates, the sharp angle design allows air to flow through the blade 410 more smoothly, reducing energy loss and improving the efficiency of the fan. The sharp angle design allows the blade 410 to better cut the air when rotating, forming a continuous airflow, which helps to enhance the air supply capacity of the fan 400, allowing the fan 400 to generate a larger air volume and a more uniform wind direction. The sharp angle design also helps to reduce the noise generated by the fan 400 during operation. When air flows through the blade, the sharp angle design can reduce the generation of vortices, thereby reducing the noise level. The sharp angle design can also improve the strength and rigidity of the blade 410, allowing it to withstand greater stress and load.

[0104] The blade 410 includes a trailing edge 413 , which is located at the rear end of the blade 410 in the rotation direction and connects the blade tip 412 and the blade root 411 ; the trailing edge 413 defines a trailing edge contour line, which is set in the direction from the blade root 411 to the blade tip 412 .

[0105] It should be noted that the reinforcing rib 430 extends from the leading edge 414 to the trailing edge 413 , and the reinforcing rib 430 is bent in a direction away from the blade root 411 .

[0106] When the blade 410 rotates, the airflow generated by it is mainly based on the principle of aerodynamics. The specific flow process is as follows:

[0107] The blades 410 rotate: When the driving motor 500 is started, it drives the blades 410 to rotate.

[0108] Airflow generation: As the blades 410 rotate, they begin to cut the surrounding air. The air is compressed at the leading edge 414 and the flow rate increases, while at the trailing edge 413, the air flow rate decreases and the pressure increases accordingly. This change in flow rate and pressure follows the Bernoulli principle.

[0109] Airflow propulsion: Due to the flow velocity and pressure difference between the leading edge 414 and the trailing edge 413, a thrust is generated perpendicular to the blade 410. This thrust pushes the air to flow in the direction of rotation of the blade 410. At the same time, due to the rotation of the blade 410, the air is also affected by the centrifugal force and diffuses outward from the blade root 411, further increasing the speed and thrust of the air flow.

[0110] Airflow distribution: As the blades 410 continue to rotate, a large amount of air is continuously pushed and diffused, forming a continuous airflow with a certain speed and direction. These airflows are evenly distributed to the air outlet of the fan.

[0111] The shape of the trailing edge 413 is an important factor affecting noise. Different shapes of the trailing edge 413 will change the structure and strength of the trailing vortex, thereby affecting the generation and propagation of noise.

[0112] In this embodiment, the trailing edge contour curve is optimized and designed to be a multi-segment arc line. Compared with regular curve structures such as straight line structures or circular arc structures, the multi-segment arc line of the trailing edge contour line can optimize the performance of the blade 410, reduce the shedding of the wake vortex of the blade 410, reduce noise, and thereby reduce the noise of the entire fan.

[0113] like Figure 8 and Fig.11 As shown, specifically, the trailing edge contour curve includes a first bend 4131 , and the first bend 4131 is convex toward a side away from the leading edge 414 .

[0114] The first bend 4131 can optimize the flow structure near the trailing edge 413, make the flow more stable and smooth, reduce flow separation and vortex generation, reduce energy loss, and improve the performance of the fan 400. The first bend 4131 can also enhance the structural strength of the trailing edge 413. In some cases, the first bend 4131 can guide the direction of the vortex and guide the vortex to an area that has less impact on the performance of the fan 400, thereby reducing the impact of the vortex on the performance of the fan 400.

[0115] The first bend 4131 is arranged away from the blade top 412 and the blade root 411. The purpose is to make the positions close to the blade root 411 and close to the blade top 412 as transition positions. The airflow contacts or leaves the blade 410 at the transition position. If the first bend 4131 is set at the transition position, it will have a blocking effect on the airflow.

[0116] The trailing edge profile curve includes a second bend 4132, and the second bend 4132 is concave toward the side close to the leading edge 414 to form a noise reduction notch 4133. The second bend 4132 can reduce the aerodynamic noise of the axial flow fan 400, mainly because a smaller vortex can be induced at the noise reduction notch 4133, reducing the generation of large-scale vortices, thereby reducing aerodynamic noise. The second bend 4132 can also reduce pressure pulsation on the surface of the blade 410, reduce energy loss, and improve the energy efficiency of the fan 400.

[0117] The second curved portions 4132 are provided in plurality to form a plurality of noise reduction notches 4133 on the trailing edge 413 , thereby increasing the noise reduction effect of the blade 410 .

[0118] The second bend 4132 is arranged near the blade top 412 and / or the blade root 411. Its purpose is to make the positions near the blade root 411 and near the blade top 412 as transition positions. The airflow contacts or leaves the blade 410 at the transition position. If the second bend 4132 is arranged at the transition position, smaller vortices can be induced, reducing the generation of large-scale vortices, thereby reducing aerodynamic noise.

[0119] Two adjacent second bends 4132 are connected to each other through the first bend 4131 .

[0120] In some embodiments, the first bend 4131 is provided in plurality, and the plurality of first bends 4131 and the plurality of second bends 4132 are spaced apart from each other.

[0121] By providing the noise reduction notch 4133 at the trailing edge 413, the load on the blade tip 412 can be significantly reduced, the flow rate of the undercurrent from the pressure surface to the suction surface can be reduced, and the strength of the leakage vortex of the blade tip 412 can be suppressed. At the same time, the noise reduction notch 4133 can achieve the effects of noise reduction and reduced consumables.

[0122] The shape of the blade is an important factor affecting the airflow noise. The blade shape includes at least the curved shape and inclination angle of the blade. The curved shape and degree of the blade will directly affect the wind speed and air discharge of the fan. The inclination angle of the blade will directly affect the aerodynamic force it receives. When the inclination angle is large, the aerodynamic force received by the blade is small, resulting in a slower rotation speed and thus a slower flow rate. On the contrary, when the inclination angle is small, the aerodynamic force is large, the rotation speed is faster, and the flow rate increases accordingly. The blade angle affects not only the wind speed, but also the air volume.

[0123] In this embodiment, the blade profile is optimized to reduce the noise generated when the fan 400 is running.

[0124] Specifically, a cylindrical surface that is concentric with the hub 420, has a radius R and extends along the axis of the hub 420 is defined as a cross section; the blade 410 and the cross section together define a cross-sectional curve, and the length L of the projection curve of the cross-sectional curve in the horizontal plane satisfies the relationship: L≥L1, L≤L2.

[0125] The cross-sectional curve is affected by the value of the cross-sectional radius R. When the value of the cross-sectional radius R is different, the cross-sectional curve is also different.

[0126] In some embodiments, if the cross-sectional curve includes at least two arc curves, the radius R and the radius r1 of the hub 420 satisfy the relationship: R≥2.26r1.

[0127] If the cross-sectional curve includes at most one arc curve, the radius R and the radius r1 of the hub 420 satisfy the relationship: R≤2.76r1.

[0128] In some other embodiments, if the cross-sectional curve includes at least two arc curves, the radius R and the radius r2 of the projection curve of the contour line of the blade tip 412 in the horizontal plane satisfy the relationship: R≥0.58r2.

[0129] If the cross-sectional curve includes at most a circular arc curve, the radius R and the radius r2 of the projection curve of the contour line of the blade tip 412 in the horizontal plane satisfy the relationship: R≤0.7r2.

[0130] The cross section includes a first cross section, the radius of the first cross section is R1, and the blade 410 and the first cross section together define a first cross-sectional curve.

[0131] The cross section includes a second cross section, the radius of the second cross section is R2, and the blade 410 and the second cross section together define a second cross-sectional curve.

[0132] In some embodiments, if the second cross-sectional curve includes at least two arc curves and the first cross-sectional curve includes at most one arc curve, the radius R2 and the radius R1 satisfy the relationship: R2>R1.

[0133] In some embodiments, if the height H1 of the first cross-sectional curve and the height H2 of the second cross-sectional curve satisfy the relationship: H2>H1, then the radius R2 and the radius R1 satisfy the relationship: R2>R1.

[0134] In some embodiments, if the length L of the projection curve of the first cross-sectional curve in the horizontal plane and the length L3 of the projection curve of the second cross-sectional curve in the horizontal plane satisfy the relationship: L3>L, then the radius R2 and the radius R1 satisfy the relationship: R2>R1.

[0135] The shape of the blade 410 is described in detail below with specific numerical values, wherein the thickness of the blade 410 is 2 mm.

[0136] like Fig.11 As shown, the contour curve of the trailing edge 413 includes 6 arc curves, which are connected in sequence from the blade root 411 to the blade tip 412. The radii of the 6 arc curves are not exactly the same, and the radii of the 6 arc curves are 86 mm, 35 mm, 28 mm, 104 mm, 36 mm, and 77 mm, respectively. Among them, the arc curve with a radius of 86 mm is set close to the blade root 411, and the arc curve with a radius of 77 mm is set close to the blade tip 412.

[0137] It should be noted that the arc curve with a radius of 28 mm and the arc curve with a radius of 36 are bent in a direction away from the leading edge 414, and the arc curve with a radius of 35 mm, the arc curve with a radius of 104 mm, and the arc curve with a radius of 77 mm are bent toward the leading edge 414. It can be seen that the arc curve with a radius of 28 mm and the arc curve with a radius of 36 are the first bend 4131, and the arc curve with a radius of 35 mm, the arc curve with a radius of 104 mm, and the arc curve with a radius of 77 mm are bent toward the leading edge 414 to form the second bend 4132.

[0138] It should also be noted that the forward sweep of the trailing edge 413 is 21.8°.

[0139] A first cross section is established with the axis center of the hub 420 and a radius of 585 mm, and the blade 410 is limited to form a first cross-sectional curve in the first cross section.

[0140] A second cross section is established with the axis center of the hub 420 and a radius of 500 mm, and the blade 410 defines a second cross-sectional curve in the second cross section.

[0141] A third section is established with the axis center of the hub 420 and a radius of 414 mm, and the blade 410 is limited to form a third section curve in the third section.

[0142] A fourth section is established with the axis center of the hub 420 and a radius of 340 mm, and the blade 410 is limited to form a fourth section curve in the fourth section.

[0143] A fifth section is established with the axis center of the hub 420 and a radius of 260 mm, and the blade 410 is limited to form a fifth section curve in the fifth section.

[0144] A sixth section is established with the axis center of the hub 420 and a radius of 188 mm, and the blade 410 is limited to form a sixth section curve in the sixth section.

[0145] like Fig.12As shown, the first section curve includes two arc curves, and the radii of the two arc curves are 545 mm and 957 mm respectively, wherein the arc curve with a radius of 957 mm is arranged close to the blade top 412, and the arc curve with a radius of 545 mm is arranged close to the blade root 411; the length of the projection curve of the first section curve in the horizontal plane is 354 mm, and the height of the projection curve of the first section curve in the vertical plane is 146 mm.

[0146] like Fig.13 As shown, the second section curve includes two arc curves, and the radii of the two arc curves are 737 mm and 1354 mm respectively, wherein the arc curve with a radius of 1354 mm is arranged close to the blade top 412, and the arc curve with a radius of 737 mm is arranged close to the blade root 411; the length of the projection curve of the second section curve in the horizontal plane is 315 mm, and the height of the projection curve of the second section curve in the vertical plane is 137 mm.

[0147] like Fig.14 As shown, the third section curve includes two arc curves, and the radii of the two arc curves are 669 mm and 558 mm respectively, wherein the arc curve with a radius of 558 mm is arranged close to the blade top 412, and the arc curve with a radius of 669 mm is arranged close to the blade root 411; the length of the projection curve of the third section curve in the horizontal plane is 276 mm, and the height of the projection curve of the third section curve in the vertical plane is 127 mm.

[0148] like Fig.15 As shown, the fourth section curve includes an arc curve, and the radius of the arc curve is 556 mm; the length of the projection curve of the fourth section curve in the horizontal plane is 233 mm, and the height of the projection curve of the fourth section curve in the vertical plane is 114 mm.

[0149] like Fig.16 As shown, the fifth section curve includes an arc curve, and the radius of the arc curve is 473 mm; the length of the projection curve of the fifth section curve in the horizontal plane is 175 mm, and the height of the projection curve of the fifth section curve in the vertical plane is 94 mm.

[0150] like Fig.17 As shown, the sixth section curve includes an arc curve, and the radius of the arc curve is 276 mm; the length of the projection curve of the sixth section curve in the horizontal plane is 129 mm, and the height of the projection curve of the sixth section curve in the vertical plane is 69 mm.

[0151] After actual measurement, the fan speed is 400 to 850rpm, the air volume is 5600m³ / h, and the noise level at the measuring point 1m above is as low as 61.5dB(A), which is lower than the industry average of 66dB(A), and the noise reduction is 4.5dB.

[0152] The above-mentioned top-discharge air-conditioning outdoor unit improves and optimizes the shape of the trailing edge 413 and the shape of the blade 410. On the premise that the rotation speed of the blade 410 remains unchanged, the air volume and air pressure of the fan 400 can be increased, thereby reducing the noise generated when the fan 400 is running; on the premise that the air volume of the fan 400 remains the same, the rotation speed of the blade 410 can be reduced, thereby reducing the noise generated when the fan 400 is running.

[0153] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0154] For ease of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are intended to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A top-outlet air-conditioning outdoor unit, characterized in that: include: A casing, comprising a casing air outlet and a casing air inlet, wherein the casing air outlet is arranged at the top of the casing, and the casing air inlet is arranged at the outer periphery of the casing; An outdoor heat exchanger is disposed inside the casing, and the outdoor heat exchanger is disposed close to an air inlet of the casing; A compressor, which is arranged inside the casing; An outdoor fan is arranged inside the casing and close to the air outlet of the casing; At least part of the outdoor fan is located above the compressor, and the outdoor fan includes a hub and blades arranged on the outer peripheral surface of the hub; The blade comprises: a blade root connected to the hub; A blade tip, arranged radially away from the hub relative to the blade root; A leading edge, located at the front end of the blade in the rotation direction and connecting the blade tip and the blade root; A trailing edge, located at the rear end of the blade in the rotation direction and connecting the blade tip and the blade root; The trailing edge is limited to form a trailing edge contour line, and the trailing edge contour line is set in the direction from the blade root to the blade top; the trailing edge contour curve includes a first bend and a second bend, the first bend is convex to the side away from the leading edge, and the second bend is concave toward the side close to the leading edge to form a noise reduction notch; the first bend is connected to the second bend in sequence.

2. The top-outlet air conditioner outdoor unit according to claim 1, characterized in that: The second bend portion is at least configured as two second bend portions, and the two second bend portions are distributed along a direction from the blade root to the blade top; and the two second bend portions are connected to each other through the first bend portion.

3. The top-outlet air-conditioning outdoor unit according to claim 1, characterized in that: The second curved portion is disposed close to the blade tip and / or the blade root, and the first curved portion is disposed away from the blade tip and the blade root.

4. A top-outlet air-conditioning outdoor unit, characterized in that: include: A casing, comprising a casing air outlet and a casing air inlet, wherein the casing air outlet is arranged at the top of the casing, and the casing air inlet is arranged at the outer periphery of the casing; An outdoor heat exchanger is disposed inside the casing, and the outdoor heat exchanger is disposed close to an air inlet of the casing; A compressor, which is arranged inside the casing; An outdoor fan is arranged inside the casing and close to the air outlet of the casing; At least part of the outdoor fan is located above the compressor, and the outdoor fan includes a hub and blades arranged on the outer peripheral surface of the hub; The blade comprises: A blade root connected to the hub; the length of a projection curve of the contour line of the blade root in a horizontal plane is L1; A blade tip is arranged radially away from the hub relative to the blade root; the length of a projection curve of a contour line of the blade tip in a horizontal plane is L2; A cylindrical surface which is concentric with the hub, has a radius of R and extends along the axis of the hub is defined as a cross section; The blade and the cross section together define a cross-sectional curve, and a length L of a projection curve of the cross-sectional curve in a horizontal plane satisfies the relationship: L≥L1, L≤L2.

5. The top-outlet air-conditioning outdoor unit according to claim 4, characterized in that: If the cross-sectional curve includes at least two arc curves, the radius R and the radius r1 of the hub satisfy the relationship: R≥2.26r1; if the cross-sectional curve includes at most one arc curve, the radius R and the radius r1 of the hub satisfy the relationship: R≤2.76r1.

6. The top-outlet air-conditioning outdoor unit according to claim 4, characterized in that: If the cross-sectional curve includes at least two arc curves, the radius R and the radius r2 of the projection curve of the contour line of the blade top in the horizontal plane satisfy the relationship: R≥0.58r2; if the cross-sectional curve includes at most one arc curve, the radius R and the radius r2 satisfy the relationship: R≤0.7r2.

7. The top-outlet air-conditioning outdoor unit according to claim 4, characterized in that: The cross-section includes a first cross-section and a second cross-section, the radius of the first cross-section is R1, and the radius of the second cross-section is R2; the blade and the first cross-section together define a first cross-section curve, and the blade and the second cross-section together define a second cross-section curve; if the second cross-section curve includes at least two circular arc curves and the first cross-section curve includes at most one circular arc curve, then the radius R2 and the radius R1 satisfy the relationship: R2>R1.

8. The top-outlet air-conditioning outdoor unit according to claim 7, characterized in that: If the height H1 of the projection curve of the first cross-sectional curve in the vertical plane and the height H2 of the projection curve of the second cross-sectional curve in the vertical plane satisfy the relationship: H2>H1, then the radius R2 and the radius R1 satisfy the relationship: R2>R1.

9. The top-outlet air-conditioning outdoor unit according to claim 7, characterized in that: If the length L of the projection curve of the first cross-sectional curve in the horizontal plane and the length L3 of the projection curve of the second cross-sectional curve in the horizontal plane satisfy the relationship: L3>L, then the radius R2 and the radius R1 satisfy the relationship: R2>R1.

10. The top-outlet air-conditioning outdoor unit according to claim 1 or 4, characterized in that: The blade is provided with a reinforcing rib, and the reinforcing rib is arranged protruding from the pressure surface of the blade; the reinforcing rib extends from the leading edge to the trailing edge, and the reinforcing rib is bent in a direction away from the blade root.

Images