Top-air-output-type outdoor air-conditioning unit

Abstract

A top-air-output-type outdoor air-conditioning unit. The top-air-output-type outdoor air-conditioning unit comprises a housing (100), an outdoor heat exchanger (700), a compressor (600) and a fan (400), wherein the housing (100) comprises an air outlet (101) and an air inlet (102), the air outlet (101) being provided at the top of the housing (100), and the air inlet (102) being provided at the periphery of the housing (100); and the outdoor heat exchanger (700), the compressor (600) and the fan (400) are arranged inside the housing (100) and close to the air outlet (101). The fan (400) comprises a hub (420) and blades (410) arranged on the outer peripheral surface of the hub (420). Each blade (410) comprises a blade root (411), a blade top (412), a leading edge (414) and a trailing edge (413), wherein the blade root (411) is connected to the hub (420); the blade top (412) is arranged away from the hub (420) in a radial direction relative to the blade root (411); the leading edge (414) is located at the front end of the blade (410) in the rotation direction of the blade (410) and connects the blade top (412) and the blade root (411); the trailing edge (413) is located at the rear end of the blade (410) in the rotation direction of the blade (410) and connects the blade top (412) and the blade root (411); and the trailing edge (413) defines a trailing-edge contour line which is arranged in the direction from the blade root (411) to the blade top (412). Each trailing-edge contour line comprises first bends (4131) and second bends (4132), wherein each first bend (4131) protrudes towards the side away from a leading edge (414), and each second bend (4132) is recessed towards the side close to the leading edge (414), thereby forming noise reduction notches; and the first bends (4131) and the second bends (4132) are connected in sequence.

Description

Top-outlet air conditioner outdoor unit

[0001] This application claims priority to Chinese Patent Application No. 202421157685.6, filed May 24, 2024, and Chinese Patent Application No. 202421102226.8, filed May 20, 2024, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present disclosure relates to the field of air conditioning technology, and in particular to a top-outlet air conditioner outdoor unit. BACKGROUND

[0003] The fan is an important component of the air conditioner indoor unit, which plays an important role in the normal operation and energy efficiency improvement of the air conditioner outdoor unit. The fan drives air circulation 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 of the air and the radiator. The fan operates easily produces noise, although the air conditioner outdoor unit is usually placed outdoors, but the noise produced by the fan operation may pass through the wall and window into the room, affecting the normal life of the user. SUMMARY

[0004] The present disclosure is to solve the noise reduction problem of the top-outlet air conditioner outdoor unit.

[0005] Some embodiments of the present disclosure provide a top-outlet air conditioner outdoor unit, comprising a casing, an outdoor heat exchanger, a compressor and a fan: the casing comprises an air outlet and an air inlet, the air outlet is arranged at the top of the casing, and the air inlet is arranged at the outer periphery of the casing; the outdoor heat exchanger is arranged inside the casing, and the outdoor heat exchanger is arranged close to the air inlet; the compressor is arranged inside the casing; the fan is arranged inside the casing and close to the air outlet; at least part of the fan is located above the compressor, the fan comprises a hub and blades arranged on the outer periphery of the hub; the blades comprise a blade root, a blade tip, a leading edge and a trailing edge; the blade root is connected with the hub; the blade tip is arranged radially away from the hub relative to the blade root; the leading edge is located at the front end in the rotation direction of the blade and connects the blade tip and the blade root; the trailing edge is located at the rear end in the rotation direction of the blade and connects the blade tip and the blade root; the trailing edge defines a trailing edge contour line, which is arranged from the blade root to the blade tip; the trailing edge contour line comprises a first bend and a second bend, the first bend protrudes to the side away from the leading edge, and the second bend is recessed to the side close to the leading edge to form a noise reduction gap; the first bend and the second bend are sequentially connected.

[0006] The present technical solution designs the trailing edge contour line to comprise a first bend and a second bend, so that the first bend and the second bend are connected to each other to form a multi-segment arc line, which can reduce the shedding of blade wake vortex and reduce noise compared to regular curve structures such as straight line structures or circular arc structures, thereby reducing the noise of the entire fan. BRIEF DESCRIPTION OF DRAWINGS

[0007] Fig. 1 is a structural diagram of a top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure.

[0008] Fig. 2 is another structural diagram of a top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure.

[0009] Fig. 3 is a perspective view of a top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure, without assembling a fan cover.

[0010] Fig. 4 is a structural diagram of a top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure, without assembling a top cover, a fan cover and an electric control box.

[0011] Fig. 5 is a structural diagram of a top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure, with assembling a top cover and a fan.

[0012] Fig. 6 is a structural diagram of a fan of a top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure.

[0013] Fig. 7 is another structural diagram of a fan of a top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure.

[0014] Fig. 8 is a structural diagram of a blade of a top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure.

[0015] Fig. 9 is a structural diagram of a blade of a top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure, with a cross section.

[0016] Fig. 10 is another structural diagram of a blade of a top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure, with a cross section.

[0017] Fig. 11 is a size structural diagram of a blade of a top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure.

[0018] Fig. 12 is a size structural diagram of a cross section curve of a top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure, with a cross section radius of 585 mm.

[0019] Fig. 13 is a size structural diagram of a cross section curve of a top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure, with a cross section radius of 500 mm.

[0020] Fig. 14 is a size structural diagram of a cross section curve of a top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure, with a cross section radius of 414 mm.

[0021] Fig. 15 is a size structural diagram of a cross section curve of a top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure, with a cross section radius of 340 mm.

[0022] Fig. 16 is a size structural diagram of a cross section curve of a top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure, with a cross section radius of 260 mm.

[0023] Fig. 17 is a size structure diagram of a cross-sectional curve when the cross-sectional radius is 188 mm in the top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure.

[0024] Fig. 18 is a structure diagram of the top cover and the fan assembly in the top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure.

[0025] Fig. 19 is a partial enlarged view of A in Fig. 18.

[0026] Fig. 20 is a structure diagram of the top cover and the fan assembly in the top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure.

[0027] Fig. 21 is a cross-sectional view of the top cover and the fan assembly in the top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure.

[0028] Fig. 22 is a partial enlarged view of B in Fig. 21.

[0029] Fig. 23 is a structure diagram of the top cover and the fan assembly in the top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure.

[0030] Fig. 24 is a cross-sectional view of the top cover and the fan assembly in the top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure.

[0031] Fig. 25 is a structure diagram of the top cover and the fan assembly in the top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure.

[0032] Fig. 26 is a partial enlarged view of C in Fig. 25.

[0033] Fig. 27 is another structure diagram of the top cover and the fan assembly in the top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure.

[0034] Fig. 28 is a partial enlarged view of D in Fig. 27.

[0035] Fig. 29 is a cross-sectional view of the top cover and the fan assembly in the top-outlet air conditioner outdoor unit according to some embodiments of the present disclosure.

[0036] Fig. 30 is a partial enlarged view of E in Fig. 29. DETAILED DESCRIPTION

[0037] Some embodiments of the present disclosure will be described below in connection with the appended drawings, which are provided by way of example and should not be construed as limiting. It should be apparent to those skilled in the art that the described embodiments are merely a few of the many possible embodiments that are within the scope of the present disclosure.

[0038] Unless the context clearly requires otherwise, throughout the description and the claims, the term "comprise," and variations thereof (e.g., "comprises" and "comprising"), will be construed to be inclusive in a manner consistent with the term's plain meaning, namely, "including but not limited to." In describing the description, the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific example" or "some examples," and the like, mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the disclosure, but that it can not be included in other embodiments or examples. The illustrative appearance of the foregoing terms in various places in the description are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0039] Hereinafter, the terms "first", "second", etc. are used only for the purpose of description and should not be construed as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the disclosure, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0040] In describing some embodiments, "coupled" and "connected," and variations thereof, can be used. The term "connected" should be interpreted broadly, for example, "connected" can be fixedly connected, or detachably connected, or integrated; can be directly connected, or connected through an intermediate medium. The term "coupled" indicates that two or more components have direct physical contact or electrical contact. The term "coupled" or "communicatively coupled" can also mean that two or more components do not have direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content herein.

[0041] "A, B, and C at least one of" has the same meaning as "at least one of A, B, or C", and includes the following combinations of A, B, and C: only A, only B, only C, a combination of A and B, a combination of A and C, a combination of B and C, and a combination of A, B, and C.

[0042] "A and / or B" includes the following three combinations: only A, only B, and a combination of A and B.

[0043] The use of “adapted to” or “configured to” herein means open and inclusive language that does not exclude devices that are adapted to or configured to perform additional tasks or steps.

[0044] As used herein, “about,” “approximately” or “around” includes the recited value and the average value within an acceptable range of deviation from the particular value, as determined by one of ordinary skill in the art considering the measurement in question and the error in measuring the particular quantity (i.e., the limitations of the measurement system).

[0045] As used herein, “parallel,” “perpendicular,” “equal” includes the recited condition and conditions that approximate the recited condition, the approximation being within an acceptable range of deviation, as determined by one of ordinary skill in the art considering the measurement in question and the error in measuring the particular quantity (i.e., the limitations of the measurement system). For example, “parallel” includes absolute parallel and near parallel, where near parallel can have an acceptable range of deviation, for example, within 5°; “perpendicular” includes absolute perpendicular and near perpendicular, where near perpendicular can also have an acceptable range of deviation, for example, within 5°. “Equal” includes absolute equality and near equality, where near equality can have an acceptable range of deviation, for example, where the difference between the two is less than or equal to 5% of either.

[0046] In the ejector air conditioner outdoor unit, the fan is usually an axial fan, which includes a hub and a plurality of blades arranged on the hub. During rotation, the blades interact with the surrounding air through the specific shape and movement mode of the blades, generating a continuous airflow. This airflow not only has a speed, but also has a certain directionality. During the rotation of the blades with the hub, there is a strong flutter vibration phenomenon, which in turn causes vibration of the entire axial fan, producing a large noise. The tail edge shape and the blade shape are important factors affecting the noise of the axial fan. Although there are many optimization designs for the tail edge shape and the blade shape in the prior art, the tail edge shape and the blade shape still cannot well meet the noise reduction requirements of the ejector air conditioner outdoor unit.

[0047] To solve the above problems, as shown in FIG. 1 and FIG. 2, the outdoor unit of the air conditioner according to some embodiments of the present disclosure includes a housing 100 for forming the overall appearance of the outdoor unit of the air conditioner. The top of the housing 100 and the bottom of the housing 100 are opposite ends, and the height direction of the housing 100 is from the bottom of the housing 100 to the top of the housing 100. The left side of the housing 100 and the right side of the housing 100 are opposite sides, and the length direction of the housing 100 is from the left side of the housing 100 to the right side of the housing 100. The front side of the housing 100 and the back side of the housing 100 are opposite sides, and the thickness direction of the housing 100 is from the front side of the housing 100 to the back side of the housing 100.

[0048] As shown in FIG. 3, the housing 100 includes an air outlet 101. The air outlet 101 can be provided at the top of the housing 100. The air inside the housing 100 is output to the outside through the air outlet 101.

[0049] As shown in FIG. 3, in some embodiments, the opening direction of the air outlet 101 is upward.

[0050] As shown in FIG. 3, the housing 100 includes an air inlet 102. The air inlet 102 can be provided at the outer periphery of the housing 100. The outdoor air enters the inside of the housing 100 through the air inlet 102.

[0051] As shown in FIG. 3, in some embodiments, the opening direction of the air inlet 102 intersects the opening direction of the air outlet 101.

[0052] As shown in FIG. 2 and FIG. 3, the housing 100 includes a top cover 110. The top cover 110 is located at the top of the housing 100. The air outlet 101 can be provided in the top cover 110.

[0053] As shown in FIG. 3, in some embodiments, the opening of the air outlet 101 is circular and is provided at the middle part of the top cover 110.

[0054] As shown in FIG. 3 and FIG. 4, the housing 100 includes a side plate 120. The side plate 120 is connected to the top cover 110. The side plate 120 is located below the top cover 110. The air inlet 102 can be provided in the side plate 120.

[0055] As shown in FIG. 3, in some embodiments, the top cover 110 can be detachably connected to the side plate 120 by means of bolts, screws or the like.

[0056] As shown in FIG. 3 and FIG. 4, the casing 100 comprises a bottom plate 130. The bottom plate 130 is arranged below the side plate 120. The bottom plate 130 is arranged corresponding to the top cover 110 along the height direction of the casing 100. The bottom plate 130, the side plate 120 and the top cover 110 jointly define a containing cavity. The containing cavity is used to contain components such as the outdoor heat exchanger 700, the compressor 600 and the fan 400 arranged inside the casing 100. The air inlet 102 and the air outlet 101 can be respectively communicated with the containing cavity.

[0057] As shown in FIG. 4, in some embodiments, the bottom plate 130 can have a cut-angle quadrilateral structure, and the casing 100 has a substantially quadrangular structure.

[0058] As shown in FIG. 2 and FIG. 3, the top air outlet type outdoor air conditioner comprises an electric control box 300. The electric control box 300 is arranged on the casing 100 and located outside the containing cavity. The electric control box 300 is arranged close to the upper side of the cut-angle of the bottom plate 130. The electric control box 300 is provided with electrical elements required for the operation of the outdoor air conditioner. This belongs to the prior art in the field and will not be described here.

[0059] As shown in FIG. 4, the top air outlet type outdoor air conditioner comprises an outdoor heat exchanger 700. The outdoor heat exchanger 700 is arranged inside the casing 100. The outdoor heat exchanger 700 is used to exchange heat with air passing through the outdoor heat exchanger 700. The outdoor heat exchanger 700 can be arranged close to the air inlet 102. The outdoor heat exchanger 700 can be mounted on the bottom plate 130.

[0060] As shown in FIG. 4, the top air outlet type outdoor air conditioner comprises a compressor 600. The compressor 600 is arranged inside the casing 100. The compressor 600 is mounted on the bottom plate 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 jointly form a refrigerant circulation loop. The refrigerant flows in the refrigerant circulation loop to realize the refrigeration or heating of the indoor environment by the air conditioner.

[0061] As shown in FIG. 4, in some embodiments, the compressor 600 can be arranged at the middle part of the bottom plate 130. The outdoor heat exchanger 700 can be arranged at the outer edge part of the bottom plate 130. The outdoor heat exchanger 700 can be 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, so that the air entering the inside of the casing 100 can be in contact with the outdoor heat exchanger 700 in time, thereby increasing the heat exchange effect of the outdoor heat exchanger 700.

[0062] As shown in FIG. 3, the top-outlet air conditioner outdoor unit includes a fan 400. The fan 400 is located in the containing cavity. The fan 400 can be arranged close to the air outlet 101. Through the operation of the fan 400, outdoor air enters the containing cavity from the air inlet 102, contacts the outdoor heat exchanger 700, and is output to the outside through the air outlet 101.

[0063] As shown in FIG. 3, in some embodiments, the fan 400 is an axial fan, and the fan 400 is arranged corresponding to the air outlet 101 along the height direction of the casing 100.

[0064] As shown in FIG. 3, in some embodiments, the fan 400 is located below the air outlet 101.

[0065] As shown in FIG. 3 and FIG. 4, in some embodiments, the compressor 600 is located below the fan 400, so that the fan 400 can be arranged close to the air outlet 101.

[0066] As shown in FIG. 5, in some embodiments, the top cover 110 is connected with a wind guide ring 111. The wind guide ring 111 can be arranged at the air outlet 101. The wind 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 wind guide ring 111 is used to guide the air flow in the containing cavity, so that the fan 400 can better play the role of air guiding.

[0067] As shown in FIG. 2 and FIG. 3, the top-outlet air conditioner outdoor unit includes a fan cover 200 arranged at the air outlet 101 and mounted on the top cover 110. The fan cover 200 is used to protect the fan 400, protect the blades 410, and avoid damage to the fan 400 or cause accidental injury due to the suction of indoor sundries. The fan cover 200 can also concentrate and uniformly guide the air flow, so that the air flow blown by the fan 400 is more concentrated and uniform.

[0068] As shown in FIG. 3, the top-outlet air conditioner outdoor unit includes a driving motor 500 for driving the fan 400 to rotate. The driving motor 500 is mounted 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 arranged downward.

[0069] As shown in FIG. 6 and FIG. 7, the fan 400 includes blades 410 for pushing air flow. The blades 410 are usually arranged in multiple, and the multiple blades 410 are distributed in a circle.

[0070] As shown in FIG. 6 and FIG. 8, the blades 410 are provided with reinforcing ribs 430 arranged on the pressure surface of the blades 410. By arranging the reinforcing ribs 430, the strength of the blades 410 is increased.

[0071] As shown in FIGS. 7 and 8, in some embodiments, the middle portion of the blade 410 is convex towards the pressure surface of the blade 410 to form a reinforcing rib 430 on the pressure surface of the blade 410. A groove portion 440 is formed on the leeward surface of the blade 410, and the reinforcing rib 430 is adapted to the groove portion 440.

[0072] In other embodiments, the reinforcing rib 430 is formed by stamping the blade 410 to simplify the production of the reinforcing rib 430.

[0073] As shown in FIGS. 6 and 7, in some embodiments, the fan 400 includes a hub 420 for mounting the blades 410. One end of the blade 410 is connected to the hub 420, and the other end of the blade 410 extends away from the hub 420. A plurality of blades 410 are distributed circumferentially along the hub 420. The hub 420 is connected to the rotating shaft of the driving motor 500 to drive the driving motor 500 to rotate the hub 420 and thus the blades 410.

[0074] As shown in FIG. 6, in some embodiments, the number of 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 and thus the blades 410.

[0075] As shown in FIGS. 6 and 7, in some embodiments, the hub 420 includes a connecting arm 421 located at the outer edge of the hub 420, and the connecting arm 421 is connected to the blade 410.

[0076] It should be noted that the connecting arm 421 is arranged correspondingly to the blade 410, and the number of connecting arms 421 is the same as the number of blades 410.

[0077] As shown in FIG. 8, in some embodiments, the blade 410 includes a blade root 411 connected to the hub 420. The blade root 411 defines a blade root profile line, and the length of the projection curve of the blade root profile line in the horizontal plane is L1.

[0078] As shown in FIG. 8, the blade 410 includes a blade tip 412 arranged radially away from the hub 420 relative to the blade root 411. The blade tip 412 defines a blade tip profile line, and the length of the projection curve of the blade tip profile line in the horizontal plane is L2.

[0079] L2 and L1 satisfy the relationship L2>L1 to reduce the air resistance when the blade 410 operates.

[0080] As shown in FIG. 8, the blade 410 includes a leading edge 414 located at the front end in the rotation direction of the blade 410, and the leading edge 414 can be connected to the blade tip 412 and the blade root 411.

[0081] As shown in FIG. 8, in some embodiments, the leading edge 414 is provided with a sharp corner near one side of the tip 412. The sharp corner 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 corner design allows air to flow more smoothly through the blade 410, reducing energy loss and improving the efficiency of the fan. The sharp corner design allows the blade 410 to cut the air better when rotating, forming a continuous airflow, which helps to enhance the air supply capacity of the fan 400, so that the fan 400 can produce a larger air volume and a more uniform air direction. The sharp corner design also helps to reduce the noise generated by the fan 400 during operation. When air flows through the blade, the sharp corner design can reduce the generation of vortex, thereby reducing the noise level. The sharp corner design can also improve the strength and stiffness of the blade 410, so that it can withstand greater stress and load.

[0082] As shown in FIG. 8, the blade 410 includes a trailing edge 413 located at the rear end of the blade 410 in the direction of rotation and connecting the tip 412 and the root 411. The trailing edge 413 defines a trailing edge profile line arranged from the root 411 to the tip 412.

[0083] It should be noted that the reinforcing rib 430 extends in the direction from the leading edge 414 to the trailing edge 413, and the reinforcing rib 430 bends away from the root 411.

[0084] The blade 410 generates airflow during rotation, mainly based on the principle of aerodynamics. The specific flow process is as follows:

[0085] Blade 410 rotation: when the driving motor 500 starts, it drives the blade 410 to rotate.

[0086] Airflow generation: as the blade 410 rotates, 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 Bernoulli's principle.

[0087] Airflow propulsion: due to the difference in flow rate and pressure between the leading edge 414 and the trailing edge 413, a thrust perpendicular to the blade 410 is generated. This thrust pushes the air to flow in the direction of rotation of the blade 410. At the same time, due to the rotational motion of the blade 410, the air is also subjected to centrifugal force, which spreads outward from the root 411, further increasing the speed and thrust of the air flow.

[0088] Airflow distribution: as the blade 410 continues to rotate, a large amount of air is continuously pushed and spread, forming a continuous airflow with a certain speed and direction. These airflows are evenly distributed to the air outlet of the fan.

[0089] The shape of the trailing edge 413 is an important factor affecting noise. Different shapes of the trailing edge 413 change the structure and strength of the trailing vortex, thereby affecting the generation and propagation of noise.

[0090] In the embodiments of the present disclosure, the trailing edge profile curve is designed as a multi-segment arc line through optimization design. Compared with a regular curve structure such as a straight line structure or a circular arc structure, the multi-segment arc line of the trailing edge profile line can optimize the performance of the blade 410, reduce the shedding of the blade 410 trailing vortex, reduce noise, and further reduce the noise of the entire fan.

[0091] As shown in FIGS. 8 and 11, in some embodiments, the trailing edge profile curve includes a first bend 4131 that protrudes away from a side close to the leading edge 414. The first bend 4131 can optimize the airflow flow field near the trailing edge 413, making the flow more stable and smooth, reducing the generation of flow separation and vortex, reducing energy loss, and improving 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 flow, directing the vortex flow to an area that has less impact on the performance of the fan 400, thereby reducing the impact of the vortex flow on the performance of the fan 400.

[0092] As shown in FIGS. 8 and 11, the first bend 4131 is disposed away from the tip 412 and the hub 411. The purpose is that the positions close to the hub 411 and close to the tip 412 are transition positions, and the airflow contacts or leaves the blade 410 at the transition positions. If the first bend 4131 is provided at the transition positions, it will block the airflow.

[0093] As shown in FIGS. 8 and 11, in some embodiments, the trailing edge profile curve includes a second bend 4132 that is recessed towards a 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 fan 400, mainly because smaller vortex flow can be induced at the noise reduction notch 4133, reducing the generation of large-scale vortex, thereby reducing the aerodynamic noise. The second bend 4132 can also reduce the pressure pulsation of the surface of the blade 410, reduce energy loss, and improve the energy efficiency of the fan 400.

[0094] As shown in FIG. 8, in some embodiments, the second bend 4132 is provided in multiple to form multiple noise reduction notches 4133 at the trailing edge 413, thereby increasing the noise reduction effect of the blade 410.

[0095] As shown in FIG. 8, the second bend 4132 is arranged close to the blade tip 412 and / or the blade root 411. The purpose of arranging the second bend 4132 close to the blade root 411 and close to the blade tip 412 is to be a transition position where the air flow contacts or leaves the blade 410. If the second bend 4132 is arranged at the transition position, it can induce smaller vortexes and reduce the generation of large-scale vortexes, thereby reducing aerodynamic noise.

[0096] As shown in FIG. 8, in some embodiments, the second bend 4132 is arranged as at least two, and the at least two second bends 4132 are distributed along the direction from the blade root 411 to the blade tip 412. Adjacent two second bends 4132 are connected to each other by the first bend 4131.

[0097] As shown in FIG. 8, in some embodiments, the first bend 4131 is arranged as a plurality, and the plurality of first bends 4131 and the plurality of second bends 4132 are arranged at intervals.

[0098] By arranging the noise reduction notch 4133 at the trailing edge 413, the load on the blade tip 412 can be significantly reduced, the flow of the potential flow 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 inhibited. At the same time, the noise reduction notch 4133 can achieve the effects of noise reduction and reducing the amount of materials.

[0099] The shape of the blade is an important factor affecting the noise of the air flow. The shape of the blade at least includes the curved shape and the inclination angle of the blade. The bending shape and degree of the blade directly affect the wind speed and air discharge of the fan. The inclination angle of the blade directly affects the aerodynamic force it receives. When the inclination angle is large, the aerodynamic force on the blade is small, resulting in a slow rotation speed and a slow flow speed. Conversely, when the inclination angle is small, the aerodynamic force is large, the rotation speed is fast, and the flow speed is also increased accordingly. The blade angle not only affects the wind speed, but also affects the wind volume.

[0100] In the embodiments of the present disclosure, the noise generated when the fan 400 operates is reduced by optimizing the design of the blade shape.

[0101] In some embodiments, a cylindrical surface with a radius R and extending along the axis of the hub 420 is defined as a section. The blade 410 and the section jointly define a section curve. The length L of the projection curve of the section curve in the horizontal plane satisfies the relationship: L≥L1, L≤L2.

[0102] The section curve is affected by the value of the radius R of the section. When the radius R of the section is different, the section curve is also different.

[0103] In some embodiments, if the section curve includes at least two circular arc curves, the radius R and the radius r1 of the hub 420 satisfy the relationship: R≥2.26r1.

[0104] If the cross-sectional curve includes at most one circular-arc curve, the radius R and the radius r1 of the hub 420 satisfy the relationship: R≤2.76r1.

[0105] In some embodiments, if the cross-sectional curve includes at least two circular-arc curves, the radius R and the radius r2 of the profile curve of the tip 412 satisfy the relationship: R≥0.58r2.

[0106] If the cross-sectional curve includes at most one circular-arc curve, the radius R and the radius r2 of the profile curve of the tip 412 satisfy the relationship: R≤0.7r2.

[0107] The cross-section includes a first cross-section, and the radius of the first cross-section is R1. The blade 410 and the first cross-section jointly define a first cross-sectional curve.

[0108] The cross-section includes a second cross-section, and the radius of the second cross-section is R2. The blade 410 and the second cross-section jointly define a second cross-sectional curve.

[0109] In some embodiments, if the second cross-sectional curve includes at least two circular-arc curves and the first cross-sectional curve includes at most one circular-arc curve, the radius R2 and the radius R1 satisfy the relationship: R2>R1.

[0110] 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, the radius R2 and the radius R1 satisfy the relationship: R2>R1.

[0111] In some embodiments, if the length L of the horizontal projection curve of the first cross-sectional curve and the length L3 of the horizontal projection curve of the second cross-sectional curve satisfy the relationship: L3>L, the radius R2 and the radius R1 satisfy the relationship: R2>R1.

[0112] The shape of the blade 410 is described in detail below with specific numerical values, where the thickness of the blade 410 is 2mm.

[0113] As shown in FIG. 11, the profile curve of the trailing edge 413 includes six circular-arc curves, which are sequentially connected in the direction from the root 411 to the tip 412. The radii of the six circular-arc curves are not completely the same, and the radii of the six circular-arc curves are 86mm, 35mm, 28mm, 104mm, 36mm, and 77mm, respectively. Among them, the circular-arc curve with a radius of 86mm is arranged close to the root 411, and the circular-arc curve with a radius of 77mm is arranged close to the tip 412.

[0114] It should be noted that the circular arc curve with a radius of 28 mm and the circular arc curve with a radius of 36 mm are curved away from the leading edge 414, and the circular arc curve with a radius of 35 mm, the circular arc curve with a radius of 104 mm, and the circular arc curve with a radius of 77 mm are curved toward the leading edge 414. Therefore, the circular arc curve with a radius of 28 mm and the circular arc curve with a radius of 36 mm are the first bending part 4131, and the circular arc curve with a radius of 35 mm, the circular arc curve with a radius of 104 mm, and the circular arc curve with a radius of 77 mm are curved toward the leading edge 414 as the second bending part 4132.

[0115] It should also be noted that the radii of the six circular arc curves change in sequence, so that the gap between the trailing edge and the grid changes in sequence, which can destroy the uniformity of the air outlet of the trailing edge and reduce the aerodynamic noise. These specific values of the radii of the six circular arc curves can also be range values, for example, 81-91 mm, 30-40 mm, 23-33 mm, 99-109 mm, 31-41 mm, and 72-82 mm.

[0116] As shown in FIGS. 8 and 11, in some embodiments, the forward sweep angle of the trailing edge 413 is 21.8°.

[0117] As shown in FIGS. 9 and 10, in some embodiments, a first cross section S1 is established with a radius of 585 mm with the center of the hub 420 as the center, and the blade 410 is defined to have a first cross section curve at the first cross section S1.

[0118] As shown in FIGS. 9 and 10, a second cross section S2 is established with a radius of 500 mm with the center of the hub 420 as the center, and the blade 410 is defined to have a second cross section curve at the second cross section S2.

[0119] As shown in FIGS. 9 and 10, a third cross section S3 is established with a radius of 414 mm with the center of the hub 420 as the center, and the blade 410 is defined to have a third cross section curve at the third cross section S3.

[0120] As shown in FIGS. 9 and 10, a fourth cross section S4 is established with a radius of 340 mm with the center of the hub 420 as the center, and the blade 410 is defined to have a fourth cross section curve at the fourth cross section S4.

[0121] As shown in FIGS. 9 and 10, a fifth cross section S5 is established with a radius of 260 mm with the center of the hub 420 as the center, and the blade 410 is defined to have a fifth cross section curve at the fifth cross section S5.

[0122] As shown in FIGS. 9 and 10, a sixth cross section S6 is established with a radius of 188 mm with the center of the hub 420 as the center, and the blade 410 is defined to have a sixth cross section curve at the sixth cross section S6.

[0123] As shown in FIG. 12, the first cross-sectional curve includes two circular arc curves, and the radii of the two circular arc curves are 545 mm and 957 mm respectively. Among them, the circular arc curve with a radius of 957 mm is arranged close to the blade tip 412, and the circular arc curve with a radius of 545 mm is arranged close to the blade root 411. The length of the first cross-sectional curve in the horizontal plane is 354 mm, and the height of the first cross-sectional curve in the vertical plane is 146 mm.

[0124] As shown in FIG. 13, the second cross-sectional curve includes two circular arc curves, and the radii of the two circular arc curves are 737 mm and 1354 mm respectively. Among them, the circular arc curve with a radius of 1354 mm is arranged close to the blade tip 412, and the circular arc curve with a radius of 737 mm is arranged close to the blade root 411. The length of the second cross-sectional curve in the horizontal plane is 315 mm, and the height of the second cross-sectional curve in the vertical plane is 137 mm.

[0125] As shown in FIG. 14, the third cross-sectional curve includes two circular arc curves, and the radii of the two circular arc curves are 669 mm and 558 mm respectively. Among them, the circular arc curve with a radius of 558 mm is arranged close to the blade tip 412, and the circular arc curve with a radius of 669 mm is arranged close to the blade root 411. The length of the third cross-sectional curve in the horizontal plane is 276 mm, and the height of the third cross-sectional curve in the vertical plane is 127 mm.

[0126] As shown in FIG. 15, the fourth cross-sectional curve includes a circular arc curve, and the radius of the circular arc curve is 556 mm. The length of the fourth cross-sectional curve in the horizontal plane is 233 mm, and the height of the fourth cross-sectional curve in the vertical plane is 114 mm.

[0127] As shown in FIG. 16, the fifth cross-sectional curve includes a circular arc curve, and the radius of the circular arc curve is 473 mm. The length of the fifth cross-sectional curve in the horizontal plane is 175 mm, and the height of the fifth cross-sectional curve in the vertical plane is 94 mm.

[0128] As shown in FIG. 17, the sixth cross-sectional curve includes a circular arc curve, and the radius of the circular arc curve is 276 mm. The length of the sixth cross-sectional curve in the horizontal plane is 129 mm, and the height of the sixth cross-sectional curve in the vertical plane is 69 mm.

[0129] Through actual measurement, the fan 400 rotates at a speed of 850 rpm, and the air volume is 5600 m 3 / h, the noise at the measurement point 1 m directly above is as low as 61.5 dB(A), which is lower than the industry average of 66 dB(A) and reduces noise by 4.5 dB.

[0130] The top-outlet air conditioner outdoor unit improves the shape of the trailing edge 413 and the shape of the blade 410, and under the premise that the rotation speed of the blade 410 is unchanged, the air volume and air pressure of the fan 400 can be improved, thereby reducing the noise generated when the fan 400 operates. Under the premise that the air volume of the fan 400 is the same, the rotation speed of the blade 410 can be reduced, thereby reducing the noise generated when the fan 400 operates.

[0131] The top-outlet air conditioner outdoor unit can also be used to solve the air leakage problem of the fan during operation, to reduce the axial leakage of air and the noise of the fan, and to improve the performance of the fan. In the related top-outlet air conditioner outdoor unit, during the operation of the fan, air is easily leaked from the gap between the outer edge of the blade and the inner wall of the guide ring cavity in the axial direction (i.e. the direction parallel to the axis of the fan), resulting in a decrease in air flow. Not only does this reduce the efficiency of the fan, but it also generates noise and vibration, which negatively affects the performance and service life of the fan.

[0132] As shown in FIGS. 1 and 2, the top-outlet air conditioner outdoor unit provided by the present application includes a housing 100 for forming the overall appearance of the air conditioner outdoor unit.

[0133] As shown in FIG. 3, the housing 100 includes an air outlet 101 provided at the top of the housing 100.

[0134] As shown in FIG. 3, the housing 100 includes an air inlet 102 provided at the outer periphery of the housing 100.

[0135] As shown in FIG. 3, in some embodiments, the air outlet 101 is provided as one, and the air inlet 102 is provided as multiple, with the multiple air inlets 102 arranged at the outer periphery of the housing 100.

[0136] As shown in FIG. 4, the top-outlet air conditioner outdoor unit includes an outdoor heat exchanger 700 provided inside the housing 100, and the outdoor heat exchanger 700 is used to heat the air passing through the outdoor heat exchanger 700. The outdoor heat exchanger 700 is provided close to the air inlet 102.

[0137] As shown in FIG. 4, in some embodiments, the outdoor heat exchanger 700 extends along the outer periphery of the housing 100, so as to maximize the heat exchange area of the outdoor heat exchanger 700 under the premise that the volume of the accommodation cavity is constant.

[0138] As shown in FIG. 4, the top-outlet air conditioner outdoor unit includes a compressor 600, which is arranged inside the casing 100. 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 the refrigeration or heating of the indoor environment by the air conditioner. It should be noted that the indoor heat exchanger is arranged in the air conditioner indoor unit.

[0139] As shown in FIG. 3, the top-outlet air conditioner outdoor unit includes a fan 400, which is arranged inside the casing 100. The fan 400 is arranged close to the air outlet 101. Through the operation of the fan 400, outdoor air enters the containing cavity from the air inlet 102, contacts the outdoor heat exchanger 700, and is then output to the outside from the air outlet 101.

[0140] It should be noted that the fan 400 is an axial fan, and the fan 400 and the air outlet 101 are arranged in correspondence along the height direction of the casing 100; the axial direction of the fan 400 is arranged along the height direction of the casing 100.

[0141] In some embodiments, the fan 400 is located below the air outlet 101.

[0142] In some embodiments, the compressor 600 is located below the fan 400. This arrangement can reduce the occupied area of the compressor 600 and the fan 400, facilitate the arrangement in the containing cavity, and meet the requirement of arranging the fan 400 close to the air outlet 101.

[0143] As shown in FIGS. 18 and 19, in some embodiments, the heat exchange fan 400 includes blades 410, which are used to push air flow. The blades 410 are usually arranged in multiple numbers, and the multiple blades 410 are distributed in a circle.

[0144] As shown in FIGS. 18 and 19, in some embodiments, the blade 410 includes a leading edge, which is located at the front end in the rotating direction of the blade 410. The leading edge is the part of the blade 410 that first contacts the air, and mainly undertakes the functions of guiding the air flow, reducing the resistance, and ensuring the stability of the blade 410.

[0145] As shown in FIGS. 18 and 19, the blade 410 includes a trailing edge, which is located at the end in the rotating direction of the blade 410. The main function of the trailing edge is to reduce the vortex and noise generated at the end of the blade 410.

[0146] It should be noted that the leading edge and the trailing edge are arranged in a generally upwardly inclined direction in space.

[0147] As shown in FIG. 18, the heat exchange fan 400 includes a hub 420, which is used to mount the blades 410. The multiple blades 410 are distributed in a circle along the hub 420.

[0148] As shown in FIG. 3, the top-outlet air conditioner outdoor unit comprises a driving motor 500 for driving the fan 400 to rotate.

[0149] It should be noted that the rotating shaft of the driving motor 500 is arranged downwardly, and at least the front edge portion of the blade 410 is located below the driving motor 500.

[0150] As shown in FIG. 18 and FIG. 20, the top-outlet air conditioner outdoor unit comprises a wind guide ring 111 arranged at the air outlet 101. The wind guide ring 111 defines a through cavity 1110 therein, which is in communication with the air outlet 101. The trailing edge portion of the blade 410 is arranged in the through cavity 1110, and the front edge portion of the blade 410 is located below the through cavity 1110, so that the wind guide ring 111 guides the air flow in the accommodating cavity, and the fan 400 can better play the role of air guiding.

[0151] It should be noted that the opening of the through cavity 1110 is arranged substantially along the height direction of the casing 100, so that the through cavity 1110 extends substantially along the height direction of the casing 100; and the driving motor 500 is arranged in the through cavity 1110.

[0152] As shown in FIG. 20, in some embodiments, the wind guide ring 111 is connected to the top cover 110, so that the wind guide ring 111 is arranged in the accommodating cavity.

[0153] As shown in FIG. 22 and FIG. 23, in some embodiments, the top portion of the wind guide ring 111 is provided with a bent portion 1111. The bent portion 1111 is arranged outside the casing 100, and the bent portion 1111 is connected to the outer edge of the air outlet 101.

[0154] As shown in FIG. 21 and FIG. 22, when the wind guide ring 111 is assembled with the top cover 110, the lower end of the wind guide ring 111 is arranged in the accommodating cavity through the air outlet 101, and then the bent portion 1111 is connected to and contacted with the side of the air outlet 101 away from the accommodating cavity. It should be noted that by arranging the bent portion 1111 on the wind guide ring 111 and connecting the bent portion 1111 with the outer edge of the air outlet 101, the connection between the wind guide ring 111 and the top cover 110 can be facilitated, the installation and fixation of the wind guide ring 111 can be realized, and the wind guide ring 111 can be constrained and positioned.

[0155] As shown in FIG. 22 and FIG. 24, in some embodiments, the outer edge of the air outlet 101 is provided with a connecting portion 112, and the bent portion 1111 is connected to and contacted with the connecting portion 112 through fasteners such as bolts or screws.

[0156] As shown in FIG. 22 and FIG. 24, in some embodiments, the connecting portion 112 is recessed inwardly from the top cover 110 toward the inside of the casing 100. It should be noted that the fan cover 200 is arranged at the connecting portion 112.

[0157] As shown in FIG. 24, in some embodiments, the top cover 110 is provided with an extending portion 113 arranged at the air outlet 101 and connected to the connecting portion 112, the side of the extending portion 113 away from the connecting portion 112 extends toward the inside of the casing 100, and the extending portion 113 is in contact with the outer wall of the air guide ring 111 to increase the contact area of the air guide ring 111 and the top cover 110, thereby increasing the firmness of the connection between the air guide ring 111 and the top cover 110.

[0158] As shown in FIG. 27 and FIG. 28, the outer edge of the fan 400 and the inner wall of the air guide ring 111 have a first gap 401 in a first direction intersecting the extending direction of the through cavity 1110. By providing a gap between the outer edge of the fan 400 and the inner wall of the air guide ring 111, it is convenient to arrange the trailing edge of the blade 410 in the through cavity 1110, and it can also prevent the blade 410 from colliding with the air guide ring 111 when the fan 400 is running.

[0159] As shown in FIG. 28, in some embodiments, the size D of the first gap 401 in the first direction satisfies: D≥7mm. If the size D of the first gap 401 is too small, it will increase the assembly difficulty of the blade 410 and the air guide ring 111, and the blade 410 is also prone to collide with the air guide ring 111.

[0160] As shown in FIG. 28, in some embodiments, the size D of the first gap 401 in the first direction satisfies: D≤10mm. If the size D of the first gap 401 is too large, the air flowing into the through cavity 1110 will flow from the first gap 401 without flowing through the blade 410, resulting in axial leakage of the air, which not only reduces the effect of the air guide ring 111, but also generates a larger noise when the air flows.

[0161] As shown in FIG. 28, in some embodiments, the size D of the first gap 401 in the first direction satisfies: D≥7mm, D≤10mm. If the size D of the first gap 401 is too large, the air flowing into the through cavity 1110 will flow from the first gap 401 without flowing through the blade 410, resulting in axial leakage of the air, which not only reduces the effect of the air guide ring 111, but also generates a larger noise when the air flows. Therefore, theoretically, the size D of the first gap 401 should be as small as possible, but in practical application, if the size D of the first gap 401 is too small, it will increase the assembly difficulty of the blade 410 and the air guide ring 111, and the blade 410 is also prone to collide with the air guide ring 111.

[0162] Based on this, in the embodiments of the present disclosure, the first gap 401 is sealed by the shielding portion 1112 arranged in the first gap 401, so as to reduce the size D of the first gap 401 in the first direction.

[0163] In some embodiments, as shown in FIG. 18, FIG. 22 and FIG. 26, the inner wall of the air guide ring 111 is provided with a shielding portion 1112. The shielding portion 1112 is arranged protruding from the inner wall of the air guide ring 111. The shielding portion 1112 is located in the first gap 401. The shielding portion 1112 is used to reduce the gap between the outer edge of the fan 400 and the inner wall of the air guide ring 111, that is, the shielding portion 1112 is used to seal the first gap 401, so as to reduce the axial leakage of air and the noise of the fan 400, and improve the performance of the fan 400.

[0164] As shown in FIG. 22, FIG. 25 and FIG. 26, the outer edge of the fan 400 and the shielding portion 1112 have a second gap 402 in the first direction. The size d of the second gap 402 in the first direction satisfies the relationship d < D with the size D of the first gap 401 in the first direction.

[0165] As shown in FIG. 26, in some embodiments, the size d of the second gap 402 in the first direction is 2 mm. If the size d of the second gap 402 is too small, it will increase the assembly difficulty of the blade 410 and the air guide ring 111. If the size d of the second gap 402 is too large, it will reduce the sealing effect of the shielding portion 1112 on the first gap 401.

[0166] It should be noted that the shielding portion 1112 is arranged at the middle portion of the air guide ring 111 in the extension direction of the through cavity 1110. The cooperation area of the shielding portion 1112 and the fan 400 in the extension direction of the through cavity 1110 should be as small as possible, so as to facilitate the assembly of the blade 410 and the air guide ring 111 through the shielding portion 1112.

[0167] As shown in FIG. 30, in some embodiments, the size H of the shielding portion 1112 in the first direction satisfies H ≥ 5 mm.

[0168] As shown in FIG. 30, in some embodiments, the size H of the shielding portion 1112 in the first direction satisfies H ≤ 8 mm.

[0169] As shown in FIG. 30, in some embodiments, the size H of the shielding portion 1112 in the first direction satisfies: H≥5mm, H≤8mm. When the size H of the shielding portion 1112 in the first direction is increased, the size D of the first gap 401 in the first direction is reduced, because the contact area between the shielding portion 1112 and the blade 410 is small, and the contact area between the blade 410 and the inner wall of the air guide ring 111 is large. Therefore, in some embodiments, the size H of the shielding portion 1112 in the first direction is increased to facilitate the assembly of the fan 400 and the air guide ring 111.

[0170] It should be noted that increasing the size H of the shielding portion 1112 in the first direction will increase the outer diameter of the air guide ring 111, and the increase of the outer diameter of the air guide ring 111 will also increase the production cost of the air guide ring 111. Therefore, the size H of the shielding portion 1112 in the first direction cannot be increased indefinitely, and is at least limited by the installation space of the air guide ring 111 and the manufacturing cost of the air guide ring 111.

[0171] As shown in FIG. 26, in some embodiments, the inner wall of the air guide ring 111 is protruded towards the through cavity 1110 to form the shielding portion 1112, and the outer side of the air guide ring 111 is provided with a recessed portion 1113 corresponding to the shielding portion 1112, to facilitate the manufacturing of the shielding portion 1112 and the connection of the shielding portion 1112 and the air guide ring 111.

[0172] In other embodiments, the air guide ring 111 is made of a metal plate by curling, and the inner wall of the air guide ring 111 is punched towards the through cavity 1110 to form the shielding portion 1112, which not only simplifies the manufacturing process of the shielding portion 1112, but also increases the strength of the air guide ring 111.

[0173] As shown in FIGS. 20 and 21, in some embodiments, the shielding portion 1112 extends along the circumference of the air guide ring 111, and the extension trajectory of the shielding portion 1112 is a closed curve, so that the shielding portion 1112 can sufficiently seal the first gap 401.

[0174] As shown in FIGS. 22 and 20, in some embodiments, the cross-sectional shape of the shielding portion 1112 along the opening direction of the through cavity 1110 can be U-shaped, V-shaped or rectangular.

[0175] As shown in FIGS. 19 and 30, the blade 410 is provided with a avoiding portion 450, which is arranged corresponding to the shielding portion 1112 in the first direction; the avoiding portion 450 is arranged at the outer edge of the fan 400 and close to the trailing edge, to prevent the blade 410 from colliding with the shielding portion 1112 when the fan 400 is running.

[0176] As shown in FIG. 19 and FIG. 30, in some embodiments, the avoiding part 450 is a notch provided at the outer edge of the blade 410, and the shielding part 1112 is provided in the notch to prevent the blade 410 from contacting the shielding part 1112.

[0177] The working principle of the shielding part 1112 preventing the air from leaking in the axial direction in the above-mentioned top air outlet type air conditioner outdoor unit is as follows: through the operation of the fan 400, the air outside the casing 100 enters the containing cavity through the air inlet 102, contacts and exchanges heat with the outdoor heat exchanger 700, then enters the through cavity 1110 through the blade 410, the air in the first gap 401 is blocked by the shielding part 1112, and the air flows in the first gap 401 along the height direction of the casing 100, and then flows along the windward surface of the blade 410, sequentially passes the leading edge and the trailing edge, and is then output to the indoor through the air outlet 101.

[0178] The above-mentioned top air outlet type air conditioner outdoor unit sets the shielding part 1112 on the inner wall of the air guide ring 111 to reduce the gap between the outer edge of the fan 400 and the inner wall of the air guide ring 111, thereby reducing the axial leakage of the air and the noise of the fan 400, improving the performance of the fan 400; and sets the avoiding part 450 at the outer edge of the fan 400, and utilizes the avoiding part 450 and the shielding part 1112 to prevent the fan 400 from colliding with the shielding part 1112.

[0179] Those skilled in the art will understand that the scope of the present disclosure is not limited to the above-mentioned specific embodiments, and some elements of the embodiments can be modified and replaced without departing from the spirit of the present disclosure. The scope of the present disclosure is limited by the appended claims.

Claims

1. A top-outlet air conditioner outdoor unit, comprising: a casing including an air outlet and an air inlet, the air outlet being arranged at a top of the casing, and the air inlet being arranged at a periphery of the casing; an outdoor heat exchanger arranged inside the casing, the outdoor heat exchanger being arranged close to the air inlet; a compressor arranged inside the casing; a fan arranged inside the casing and arranged close to the air outlet; at least part of the fan being arranged above the compressor, the fan including a hub and a blade arranged on an outer circumferential surface of the hub; the blade including: a blade root connected to the hub; a blade tip arranged radially away from the hub relative to the blade root; a leading edge arranged at a front end of the blade in a rotating direction of the blade and connecting the blade tip and the blade root; a trailing edge arranged at a rear end of the blade in the rotating direction of the blade and connecting the blade tip and the blade root; the trailing edge defining a trailing edge profile line arranged from the blade root to the blade tip, the trailing edge profile line including a first bend and a second bend, the first bend being convex to a side away from the leading edge, and the second bend being concave to a side close to the leading edge to form a noise reduction notch, and the first bend and the second bend being sequentially connected. 2.The top-outlet air conditioner outdoor unit according to claim 1, wherein the second bend is arranged as at least two second bends, the two second bends being distributed along the blade root to the blade tip, and the two second bends being connected to each other through the first bend. 3.The top-outlet air conditioner outdoor unit according to claim 1 or 2, wherein the second bend is arranged close to the blade tip and / or the blade root, and the first bend is arranged away from the blade tip and the blade root. 4.A top-outlet air conditioner outdoor unit, comprising: a casing including an air outlet and an air inlet, the air outlet being arranged at a top of the casing, and the air inlet being arranged at a periphery of the casing; an outdoor heat exchanger arranged inside the casing, the outdoor heat exchanger being arranged close to the air inlet; a compressor arranged inside the casing; a fan arranged inside the casing and arranged close to the air outlet; at least part of the fan being arranged above the compressor, the fan including a hub and a blade arranged on an outer circumferential surface of the hub; the blade including: a blade root connected to the hub, a length of a projection curve of a profile line of the blade root in a horizontal plane being L1; a blade tip arranged radially away from the hub relative to the blade root, a length of a projection curve of a profile line of the blade tip in the horizontal plane being L2; a cylinder surface defined concentrically with the hub, having a radius R, and extending along an axis of the hub as a cross section; the blade and the cross section jointly defining a cross section curve, a length L of a projection curve of the cross section curve in the horizontal plane satisfying a relationship: L≥L1, L≤L2. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 5. The outdoor unit of the top-outlet air conditioner according to claim 4, wherein if the cross-sectional curve comprises at least two circular arc curves, the radius R and the radius r1 of the hub satisfy the relationship R≥2.26r1; and if the cross-sectional curve comprises at most one circular arc curve, the radius R and the radius r1 of the hub satisfy the relationship R≤2.76r1.

6. The outdoor unit of the top-outlet air conditioner according to claim 4, wherein if the cross-sectional curve comprises at least two circular arc curves, the radius R and the radius r2 of the profile curve of the blade tip in the horizontal plane satisfy the relationship R≥0.58r2; and if the cross-sectional curve comprises at most one circular arc curve, the radius R and the radius r2 satisfy the relationship R≤0.7r2.

7. The outdoor unit of the top-outlet air conditioner according to claim 4, wherein the cross-section comprises a first cross-section and a second cross-section, the first cross-section has a radius R1, and the second cross-section has a radius R2; the blade and the first cross-section together define a first cross-sectional curve, and the blade and the second cross-section together define a second cross-sectional curve; if the second cross-sectional curve comprises at least two circular arc curves and the first cross-sectional curve comprises at most one circular arc curve, the radius R2 and the radius R1 satisfy the relationship R2>R1.

8. The outdoor unit of the top-outlet air conditioner according to claim 7, wherein if the height H1 of the profile curve of the first cross-sectional curve in the vertical plane and the height H2 of the profile curve of the second cross-sectional curve in the vertical plane satisfy the relationship H2>H1, the radius R2 and the radius R1 satisfy the relationship R2>R1.

9. The outdoor unit of the top-outlet air conditioner according to claim 7, wherein if the length L of the profile curve of the first cross-sectional curve in the horizontal plane and the length L3 of the profile curve of the second cross-sectional curve in the horizontal plane satisfy the relationship L3>L, the radius R2 and the radius R1 satisfy the relationship R2>R1.

10. The outdoor unit of the top-outlet air conditioner according to claim 1 or 4, wherein the blade is provided with a reinforcing rib, the reinforcing rib is arranged on the pressure surface of the blade, extends in the direction from the leading edge to the trailing edge, and is curved away from the blade root.

11. An outdoor unit of a top-outlet air conditioner, comprising: a casing comprising an air outlet and an air inlet, the air outlet being arranged at the top of the casing, and the air inlet being arranged at the outer periphery of the casing; an outdoor heat exchanger arranged inside the casing and close to the air inlet; a compressor arranged inside the casing; a fan arranged inside the casing and close to the air outlet; a wind guide ring arranged inside the casing and at the air outlet, the wind guide ring defining a through cavity inside, and the through cavity being in communication with the air outlet; a first gap being formed between the outer edge of the fan and the inner wall of the wind guide ring in a first direction, the first direction intersecting the extension direction of the through cavity; a shielding part arranged on the inner wall of the wind guide ring and located in the first gap, and a second gap being formed between the outer edge of the fan and the shielding part in the first direction. ​ ​ ​ ​ ​ ​ ​ The size d of the second gap along the first direction satisfies the relationship d < D with the size D of the first gap along the first direction.

12. The outdoor unit of claim 11, wherein the fan comprises a blade, the blade comprises a leading edge and a trailing edge, the leading edge is located at a front end of the blade in a rotating direction of the blade, and the trailing edge is located at a terminal end of the blade in the rotating direction of the blade; the leading edge is arranged outside the through cavity, and the trailing edge is arranged inside the through cavity, and the trailing edge is located above the shielding portion.

13. The outdoor unit of claim 12, wherein the blade is provided with a avoiding portion, the avoiding portion is arranged corresponding to the shielding portion along the first direction; the avoiding portion is arranged at an outer edge of the fan and close to the trailing edge.

14. The outdoor unit of any one of claims 11-13, wherein the size D of the first gap along the first direction satisfies D≥7mm and D≤10mm.

15. An outdoor unit of an air conditioner, comprising: a casing, comprising an air outlet and an air inlet, the air outlet is arranged at a top of the casing, and the air inlet is arranged at an outer periphery of the casing; an outdoor heat exchanger, arranged inside the casing, and close to the air inlet; a compressor, arranged inside the casing; a fan, arranged inside the casing and close to the air outlet; a guide ring, arranged at the air outlet and inside the casing, and defining a through cavity in communication with the air outlet; a first gap is arranged between the fan and an inner wall of the guide ring along a first direction, the first direction intersects with an extending direction of the through cavity; a shielding portion, arranged at the inner wall of the guide ring and located in the first gap; an avoiding portion, arranged at an outer edge of the fan; the avoiding portion is arranged corresponding to the shielding portion along the first direction and cooperates with the shielding portion.

16. The outdoor unit of claim 11 or 15, wherein a size H of the shielding portion along the first direction satisfies H≥5mm and H≤8mm.

17. The outdoor unit of claim 11 or 15, wherein a side wall of the guide ring is convex to an inside of the guide ring to form the shielding portion; an outer side of the guide ring is provided with a recessed portion corresponding to the shielding portion.

18. The outdoor unit of claim 11 or 15, wherein the shielding portion extends along a circumferential direction of the guide ring, and an extending track of the shielding portion is a closed curve.

19. The outdoor unit of claim 11 or 15, wherein a top of the guide ring is provided with a bent portion, the bent portion is arranged outside the casing and connected to an outer edge of the air outlet.

20. The outdoor unit of claim 11 or 15, wherein an extending portion is arranged at the outer edge of the air outlet, the extending portion extends towards an inside of the casing, and the extending portion is in contact with an outer wall of the guide ring.

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