Air conditioner

Abstract

The invention discloses an air conditioner, relates to the technical field of air conditioning, and aims to solve the problem that a fan of the air conditioner is high in noise during working. The invention provides an air conditioner. The air conditioner comprises a shell, a heat exchanger, an air guide ring and a fan. The shell is provided with a mounting cavity, and an air outlet communicating with the mounting cavity is formed in the shell. The heat exchanger is arranged in the mounting cavity. The air guide ring is arranged at the air outlet and provided with an air guide hole. The fan is located in the mounting cavity and comprises a hub, a plurality of blades and a motor. The hub has a rotational axis. The multiple blades are connected with the hub and arranged in the circumferential direction of the hub at intervals. And each blade is provided with a suction surface and a pressure surface which are back to back. The motor is connected with the hub and used for driving the hub to rotate around the rotating axis. In the axial direction of the hub, at least part of the end, away from the hub, of the pressure face is located in the air guide hole, and the part, located in the air guide hole, of the pressure face inclines in the direction close to the suction face. The air conditioner can be used for conditioning indoor air.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioner. Background Art

[0002] An air conditioner, also known as an air conditioner, is a device that regulates and controls the temperature, humidity, and circulating air within a building or structure. In the indoor or outdoor unit of an air conditioner, the fan drives air through the heat exchanger, improving the heat exchange efficiency between the heat exchanger and the surrounding environment.

[0003] In related art, an air conditioner includes a housing, an air guide ring, and at least one fan. The housing has a mounting cavity and is provided with an air outlet connected to the mounting cavity. The air guide ring is positioned at the air outlet and has at least one air guide hole. The fans are mounted within the housing, with each fan corresponding to an air guide hole, and at least partially located within the corresponding air guide hole. The fans are used to drive air within the mounting cavity and discharge it through the corresponding air guide hole.

[0004] However, the fan of the above air conditioner produces relatively loud noise during operation. Summary of the Invention

[0005] The present application provides an air conditioner for solving the problem of high noise during operation of the air conditioner fan.

[0006] To achieve the above objectives, this application adopts the following technical solutions:

[0007] In a first aspect, embodiments of the present application provide an air conditioner comprising a housing, a heat exchanger, an air guide ring, and a fan. The housing has a mounting cavity and is provided with an air outlet connected to the mounting cavity. The heat exchanger is disposed within the mounting cavity. The air guide ring is disposed at the air outlet and has air guide holes. The fan is located within the mounting cavity and is configured to drive air within the mounting cavity out through the air guide holes.

[0008] The fan includes a hub, multiple blades, and a motor. The hub has a rotation axis. Multiple blades are connected to the hub and spaced apart along the hub's circumference. Each blade has a suction side and a pressure side facing each other. The motor is connected to the hub and is used to drive the hub to rotate about the rotation axis.

[0009] Wherein, along the axial direction of the hub, at least a portion of the end of the pressure surface away from the hub is located in the air guide hole, and the portion located in the air guide hole is inclined toward the direction close to the suction surface.

[0010] It should be noted that there is a gap between the blade and the air guide hole. When the blade rotates, the pressure on the pressure surface of the blade away from the hub is greater, and the corresponding suction surface pressure is smaller. The airflow will leak from the pressure surface to the suction surface through the gap and form a tip vortex. The collision of the tip vortex and the main airflow is likely to produce noise.

[0011] It can be understood that tilting the portion of the air guide hole toward the suction side can reduce the pressure on the pressure side of the blade away from the hub, narrowing the pressure difference between the pressure and suction sides there, and thus reducing the intensity of the tip vortex. This can reduce the noise generated by the collision of the tip vortex with the main airflow, thereby reducing the noise generated during fan operation.

[0012] In some embodiments, the pressure surface includes a first sub-surface and a second sub-surface. The first sub-surface is at least partially located within the air guide hole and has opposing first and second ends. The second sub-surface has opposing third and fourth ends, with the fourth end connected to the hub. The second end is connected to the third end, and the first end is inclined relative to the second end toward the suction surface.

[0013] In some embodiments, a first included angle between the first sub-surface and the reference surface is greater than 0° and less than or equal to 36°, and the reference surface is perpendicular to the rotation axis.

[0014] In some embodiments, along the axial direction of the hub and from the pressure surface to the suction surface, the distance between the second end and the hub gradually increases.

[0015] In some embodiments, along the axial direction of the hub, a ratio of a distance between an end point of the second end close to the air outlet and the rotation axis to a rotation radius of the plurality of blades is 0.9 to 0.94.

[0016] In some embodiments, the air guide hole has an inlet and an outlet facing each other. Along the axial direction of the hub, the inlet is located on the side of the outlet closer to the heat exchanger. The ratio of the distance between the intersection of the plane of the second end and the inlet and the rotation axis to the rotation radius of the blade is 0.94 to 0.96.

[0017] In some embodiments, the third end is at least partially located in the air guide hole, and the third end is at least partially inclined in a direction away from the suction surface.

[0018] In some embodiments, a boundary line between the second sub-surface and the first sub-surface intersects a reference line. The reference line is tangent to the second sub-surface and intersects the rotation axis. A second angle between the reference line and the reference plane is greater than 0° and less than or equal to 44°, and the reference plane is perpendicular to the rotation axis.

[0019] In some embodiments, the second sub-surface includes a connecting surface and an air guide surface. The connecting surface has a fourth end, and an end of the connecting surface distal to the hub is inclined relative to the fourth end toward the suction surface. The air guide surface is located between the connecting surface and the first sub-surface, and is connected to the connecting surface and the first sub-surface. The air guide surface has a third end, and the third end is inclined relative to the end of the air guide surface proximal to the connecting surface toward the suction surface.

[0020] In a second aspect, embodiments of the present application provide an air conditioner comprising a housing, a heat exchanger, an air guide ring, and a fan. The housing has a mounting cavity and is provided with an air outlet connected to the mounting cavity. The heat exchanger is disposed within the mounting cavity. The air guide ring is disposed at the air outlet and has air guide holes. The fan is located within the mounting cavity and is configured to drive air within the mounting cavity out through the air guide holes.

[0021] The fan includes a hub, multiple blades, and a motor. The hub has a rotation axis. Multiple blades are connected to the hub and spaced apart along the hub's circumference. Each blade has a suction side and a pressure side facing each other. The motor is connected to the hub and is used to drive the hub to rotate about the rotation axis.

[0022] Wherein, along the axial direction of the hub, at least a portion of the pressure surface away from the hub is located in the air guide hole, and at least a portion located in the air guide hole is inclined toward the direction close to the suction surface.

[0023] The beneficial effects of the air-conditioning unit provided in the second aspect are the same as those of the air-conditioning unit provided in the first aspect, and are not described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of an air conditioner provided in an embodiment of the present application;

[0025] Figure 2 A schematic diagram of a top view of an outdoor unit provided in an embodiment of the present application;

[0026] Figure 3 This is one of the structural diagrams of an outdoor unit provided in an embodiment of the present application;

[0027] Figure 4 A schematic structural diagram of an air guide ring provided in an embodiment of the present application;

[0028] Figure 5 This is one of the structural schematic diagrams of a blade provided in an embodiment of the present application;

[0029] Figure 6 This is one of the schematic cross-sectional structures of a blade in the related art;

[0030] Figure 7 The second structural diagram of a blade provided in an embodiment of the present application;

[0031] Figure 8 The third structural diagram of a blade provided in an embodiment of the present application;

[0032] Figure 9 This is a second structural diagram of an outdoor unit provided in an embodiment of the present application;

[0033] Figure 10 This is a second schematic diagram of a cross-sectional structure of a blade in the related art;

[0034] Figure 11 A fourth structural diagram of a blade provided in an embodiment of the present application;

[0035] Figure 12 The fifth structural diagram of a blade provided in an embodiment of the present application;

[0036] Figure 13 The sixth structural diagram of a blade provided in an embodiment of the present application;

[0037] Figure 14 The seventh structural diagram of a blade provided in an embodiment of the present application;

[0038] Figure 15 This is one of the schematic cross-sectional views of a blade provided in an embodiment of the present application;

[0039] Figure 16 The second schematic diagram of the cross-sectional structure of a blade provided in an embodiment of the present application;

[0040] Figure 17 A schematic diagram of pressure simulation of a blade provided in an embodiment of the present application;

[0041] Figure 18 A schematic diagram of pressure simulation of a blade in the related art;

[0042] Figure 19 The third schematic diagram of the cross-sectional structure of a blade provided in an embodiment of the present application;

[0043] Figure 20 A fourth schematic diagram of a cross-sectional structure of a blade provided in an embodiment of the present application;

[0044] Figure 21 This is a third structural diagram of an outdoor unit provided in an embodiment of the present application;

[0045] Figure 22 This is the eighth structural schematic diagram of a blade provided in an embodiment of the present application.

[0046] Reference numerals:

[0047] 1000-air conditioner;

[0048] 10-compressor; 20-four-way valve; 30-outdoor heat exchanger; 40-pressure reducer; 50-indoor heat exchanger;

[0049] 200-outdoor unit;

[0050] 60-housing; 61-installation cavity; 611-sub-cavity; 62-air inlet; 63-air outlet; 64-air guide ring; 641-panel; 642-air guide member; 643-air guide hole; 644-inlet; 645-outlet;

[0051] 70 - fan; 71 - motor; 72 - hub; 721 - axis of rotation; 73 - blade; 731 - suction surface; 7311 - flow guide structure; 732 - pressure surface; 7321 - first sub-surface; 7322 - first end; 7323 - second end; 7324 - second sub-surface; 7325 - third end; 7326 - fourth end; 7327 - connection surface; 7328 - air guide surface; 733 - reference surface; 734 - reference line;

[0052] 80-partition;

[0053] 300-Indoor unit.

[0054] R0 - blade rotation radius; R1 - distance between the second end closest to the air outlet and the rotation axis; R2 - distance between the intersection of the second end and the plane where the inlet is located and the rotation axis; R3 - distance between the second end away from the air outlet and the rotation axis; H - distance between the rotation axes of each adjacent two hubs; D - blade rotation diameter;

[0055] F1. Axial direction of the fan hub. DETAILED DESCRIPTION

[0056] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0057] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0058] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0059] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, when describing pipelines or channels, the "connected" and "connected" used in this application have the meaning of conduction. The specific meaning needs to be understood in conjunction with the context.

[0060] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0061] An air conditioner is a device that can regulate and control the temperature, humidity and circulating air of the ambient air in a building or structure.

[0062] like Figure 1 As shown, the present application provides an air conditioner 1000, which may include a compressor 10, a four-way valve 20, an outdoor heat exchanger 30, a pressure reducer 40, and an indoor heat exchanger 50. For example, the four-way valve 20 may have a first port A, a second port B, a third port C, and a fourth port D, and the compressor 10 may have a return air end and an outlet air end, as shown in FIG. Figure 1 One end of the air flowing into the compressor 10 along the arrow direction is the return air end of the compressor 10 , and the other end is the outlet air end of the compressor 10 .

[0063] The return air end of the compressor 10 can be connected to the first port A of the four-way valve 20, the outlet air end of the compressor 10 can be connected to the second port B of the four-way valve 20, the third port C of the four-way valve 20 can be connected to one end of the outdoor heat exchanger 30, the other end of the outdoor heat exchanger 30 can be connected to one end of the indoor heat exchanger 50 through the pressure reducer 40, and the other end of the indoor heat exchanger 50 can be connected to the fourth port D of the four-way valve 20.

[0064] like Figure 1As shown, the air conditioner 1000 may include an outdoor unit 200 and an indoor unit 300. For example, the compressor 10, the four-way valve 20 and the outdoor heat exchanger 30 may be part of the outdoor unit 200, and the corresponding indoor heat exchanger 50 may be part of the indoor unit 300. The pressure reducer 40 may be a throttling device such as a capillary tube or an electronic expansion valve. Figure 1 As shown, the pressure reducer 40 is installed in the indoor unit 300. The pressure reducer 40 can also be installed in the outdoor unit 200. The pressure reducer 40 can also be installed in the refrigerant pipeline between the outdoor unit 200 and the indoor unit 300. It is only necessary to make the pressure reducer 40 between the indoor heat exchanger 50 and the outdoor heat exchanger 30 along the flow direction of the refrigerant.

[0065] Based on this, driven by the compressor 10, the refrigerant can circulate between the indoor unit 300 and the outdoor unit 200 through the pipeline and produce a reversible phase change. While the refrigerant produces a phase change, it can release or absorb heat through the heat exchanger.

[0066] In this way, the refrigerant in the outdoor unit 200 can exchange heat with the surrounding medium (such as air) through the outdoor heat exchanger 30, thereby releasing heat and heating the surrounding air (or absorbing heat to cool the surrounding air). The refrigerant in the indoor unit 300 can exchange heat with the surrounding air through the indoor heat exchanger 50, thereby absorbing heat to cool the surrounding air (or releasing heat to heat the surrounding air), thereby achieving efficient cooling (or efficient heating) of the air conditioner 1000.

[0067] It should be noted that by adjusting the working state of the four-way valve 20, the air conditioner 1000 can be adjusted in the cooling state (such as Figure 1 solid line flow direction of the refrigerant) and heating conditions (such as Figure 1 The function of the four-way valve 20 can also be replaced by other switching devices or flow paths, or the four-way valve 20 is not required and the air conditioner 1000 is configured as a single cooling unit structure. This application does not limit this.

[0068] Furthermore, for the air conditioner 1000, both the outdoor heat exchanger 30 and the indoor heat exchanger 50 are part of the refrigerant heat exchanger, i.e., the refrigerant heat exchanger may include the indoor heat exchanger 50 and the outdoor heat exchanger 30. In the outdoor unit 200, the refrigerant heat exchanger may function as the outdoor heat exchanger 30, and in the indoor unit 300, the refrigerant heat exchanger may function as the indoor heat exchanger 50, although this application does not limit this.

[0069] In some embodiments, as Figure 2 As shown, Figure 2This is a schematic diagram of a top view of the structure of an outdoor unit provided in an embodiment of the present application. The outdoor unit 200 may include a shell 60, which may enclose an installation cavity 61. The shell 60 may also be provided with an air inlet 62 and an air outlet 63 connected to the installation cavity 61.

[0070] The outdoor unit 200 may include a heat exchanger, namely an outdoor heat exchanger 30 (i.e., a type of refrigerant heat exchanger). The outdoor heat exchanger 30 is arranged in the installation cavity 61. The outdoor heat exchanger 30 can exchange heat with the surrounding medium (such as air) to release heat (or absorb heat).

[0071] like Figure 3 As shown, Figure 3 This is one of the structural diagrams of an outdoor unit provided in an embodiment of the present application. The outdoor unit 200 may include an air guide ring 64 , which is arranged at the air outlet 63 .

[0072] Specifically, such as Figure 4 As shown, Figure 4 This is a structural schematic diagram of an air guide ring provided in an embodiment of the present application. The air guide ring 64 may include a panel 641 and an air guide member 642 connected together, and the air guide member 642 is formed with an air guide hole 643.

[0073] It should be noted that the panel 641 and the air guide 642 can be integrally formed or separately provided. The specific selection can be made according to actual conditions, and this application does not make any specific restrictions on this.

[0074] It should be noted that the number of the air guide rings 64 can be one or more, and the specific selection can be made according to actual conditions. This application does not make any specific restrictions on this.

[0075] In some embodiments, as Figure 2 As shown, the outdoor unit 200 may include a fan 70 , which is located in the installation cavity 61 and is used to drive the gas in the installation cavity 61 to be discharged through the air guide hole 643 .

[0076] The fan 70 may include a hub 72 and a motor 71 . The hub 72 has a rotation axis 721 . The motor 71 is connected to the hub 72 and is configured to drive the hub 72 to rotate about the rotation axis 721 .

[0077] Exemplarily, the hub 72 is connected to the output shaft of the motor 71, and the hub 72 is coaxially arranged with the output shaft of the motor 71. In this way, when the motor 71 is running, the hub 72 can be driven to rotate around the rotation axis 721 through the output shaft.

[0078] It is understandable that the motor 71 can also drive the hub 72 to rotate around the rotation axis 721 through gear transmission and belt transmission. The specific selection can be made according to actual conditions, and this application does not make any specific restrictions on this.

[0079] It should be noted that the number of fans 70 can be one or more, and the specific selection can be made according to actual conditions. This application does not make any specific restrictions on this.

[0080] like Figure 3 As shown, the fan 70 may further include a plurality of blades 73 , which are connected to the hub 72 and arranged at intervals along the circumference of the hub 72 .

[0081] Specifically, such as Figure 5 As shown, Figure 5 This is one of the schematic diagrams of a blade structure provided in an embodiment of the present application. The blade 73 includes a suction surface 731 and a pressure surface 732 facing each other. In this way, when the motor 71 drives the hub 72 to rotate around the rotation axis 721, the blade 73 also rotates, thereby driving the flow of gas.

[0082] Exemplarily, the plurality of blades 73 are connected to the hub 72 and are spaced apart along the circumference of the hub 72. It is understandable that the plurality of blades 73 are located on the circumferential side of the hub 72.

[0083] The plurality of blades 73 may be arranged to be evenly distributed along the circumference of the hub 72. This is beneficial to improving the dynamic balance of the fan 70 during rotation, so that the fan 70 can rotate smoothly.

[0084] Exemplarily, the number of blades 73 is n, where n is a natural number greater than or equal to two, and the n blades 73 are evenly distributed along the circumference of the hub 72 at a central angle of 360° / n.

[0085] For example, if the number of blades is two, the two blades 73 are evenly distributed at a central angle of 180° along the circumference of the hub 72. For another example, if the number of blades is three, the three blades 73 are evenly distributed at a central angle of 120° along the circumference of the hub 72. For another example, if the number of blades is four, the four blades 73 are evenly distributed at a central angle of 90° along the circumference of the hub 72.

[0086] It should be noted that the hub 72 and blades 73 can be designed as an integral unit for ease of processing, or as separate units for ease of later maintenance and replacement. The specific design can be selected based on actual circumstances, and this application does not impose any specific limitations thereon. It is understood that if the air conditioner 1000 includes multiple fans 70 , the number of air guide holes 643 will also be multiple, with each fan 70 corresponding to one air guide hole 643 .

[0087] It should be noted that in the air conditioner 1000, a fan 70 may also be arranged in the indoor unit 300 to drive air through the indoor heat exchanger 50 (i.e., a type of refrigerant heat exchanger) and heat or cool the surrounding environment. In this case, the housing 60 and fan 70 may also be considered as part of the indoor unit 300 and the air conditioner 1000, and this application does not specifically limit this.

[0088] It should be noted that the fan 70 can be a centrifugal fan 70 or an axial flow fan 70. The specific selection can be made according to actual conditions, and this application does not make any specific restrictions on this.

[0089] For example, the present application takes the axial flow fan 70 as an example for description.

[0090] Take the outdoor unit 200 as an example. Figure 2 As shown, the side of the housing 60 provided with the air outlet 63 is defined as the front side. Air inlets 62 may be provided on the rear side and / or on the left and right sides of the housing 60 corresponding to the mounting cavity 61. For example, the outdoor heat exchanger 30 may be positioned near the air inlet 62, the hub 72 may be connected to the output shaft of the motor 71, and the fan 70 may be positioned near the air outlet 63.

[0091] In this way, the motor 71 can drive the hub 72 to rotate, thereby driving the blades 73 to rotate about the rotation axis 721, so that the air in the installation cavity 61 is discharged through the air outlet 63. This creates a negative pressure area in the installation cavity 61, allowing air from the rear side or left and right sides of the housing 60 to flow into the installation cavity 61 through the air inlet 62. During this process, the air flowing into the installation cavity 61 through the air inlet 62 can exchange heat with the outdoor heat exchanger 30 as it flows through the outdoor heat exchanger 30, thereby achieving efficient cooling or heating at the indoor heat exchanger 50.

[0092] In addition, the air outlet 63 may be provided on the top side wall of the housing 60. Correspondingly, the air inlet 62 may be provided on at least one of the front and rear side walls and the left and right side walls of the housing 60. For example, four air inlets 62 are provided on the front and rear side walls and the left and right side walls of the housing 60. The outdoor heat exchanger 30 may be provided on the inner side of the air inlet 62 near the mounting cavity 61, and the fan 70 may be located on the inner side of the outdoor heat exchanger 30 away from the air inlet 62. Alternatively, the fan 70 may be located above the four air inlets 62 and between the air outlet 63 to drive air upward and discharge through the air outlet 63, i.e., the axis of the fan 70 is parallel to the vertical direction.

[0093] Noise is easily generated during the operation of the air conditioner, and there are many reasons for the noise. Among them, the fan 70 is one of the main sources of noise.

[0094] For example, taking a single-fan air conditioner 1000 as an example, Figure 6 As shown, Figure 6 This is a schematic diagram of a cross-sectional structure of a blade in the related art. Along the axial direction F1 of the hub 72 , the end of the pressure surface 732 of the blade 73 away from the hub 72 is at least partially located in the air guide hole 643 .

[0095] It can be understood that there is a gap between the blade 73 and the air guide hole 643. During the operation of the fan 70, when the blade 73 rotates, the pressure on the pressure surface 732 of the blade 73 in the air guide hole 643 away from the hub 72 is relatively high, forming a high-pressure airflow area, and the pressure on the corresponding suction surface 731 at this location is relatively low, forming a low-pressure airflow area. The airflow will leak through the gap from the high-pressure airflow area of ​​the pressure surface 732 of the blade 73 away from the hub 72 to the low-pressure airflow area of ​​the suction surface 731, thereby forming a tip vortex. The collision of the tip vortex with the main airflow is likely to generate noise.

[0096] Based on this, in order to reduce the noise generated by the fan 70 during operation, at least the portion located in the air guide hole 643 is tilted toward the direction close to the suction surface 731 .

[0097] This reduces the pressure on the pressure surface 732 at the end of the blade 73 away from the hub 72, narrowing the pressure difference between the pressure surface and the suction surface there, thereby reducing the intensity of the tip vortex. This reduces the noise generated by the collision of the tip vortex with the main airflow, thereby reducing the noise generated during fan operation.

[0098] It is understandable that the portion of the pressure surface 732 away from one end of the hub 72 and disposed in the air guide hole 643 may be partially inclined toward the direction close to the suction surface 731 , or may be entirely inclined toward the direction close to the suction surface 731 .

[0099] For example, Figure 7 as well as Figure 8 As shown, Figure 7 This is a second structural diagram of a blade provided in an embodiment of the present application. Figure 8 The third structural diagram of a blade provided in an embodiment of the present application shows that the portion of the pressure surface 732 located at the end away from the hub 72 and within the air guide hole 643 is tilted toward the suction surface 731. This optimizes the shape of the pressure surface 732 located within the air guide hole 643, reducing the pressure difference between the pressure surface 732 and the suction surface 731 at the end of the blade 73 away from the hub 72. This in turn reduces the intensity of the tip vortex and reduces the noise generated during the operation of the fan 70.

[0100] For example, Figure 9 As shown, Figure 9This is a second structural diagram of an outdoor unit provided in an embodiment of the present application. Taking a multi-fan air conditioner 1000 as an example, the air conditioner 1000 may include multiple fans 70 , and each fan 70 corresponds to an air guide hole 643 .

[0101] It is understood that the air guide ring 64 is disposed at the air outlet 63 and has a plurality of air guide holes 643. The plurality of air guide holes 643 extend in the same direction, and each adjacent air guide hole 643 is spaced apart. A plurality of fans 70 are located within the mounting cavity 61 and are used to drive the air within the mounting cavity 61 to be discharged through the corresponding air guide holes 643.

[0102] When the multi-fan air conditioner 1000 is working, multiple fans 70 rotate and work simultaneously. Figure 10 As shown, Figure 10 This is a second schematic diagram of a cross-sectional structure of a blade in the related art. In the axial direction F1 of the hub 72 , at least a portion of the pressure surface 732 of the blade 73 away from the hub 72 is arranged on a side of the air guide hole 643 close to the mounting cavity 61 .

[0103] It is understandable that rotational noise is generated when the blades 73 rotate. When multiple fans 70 operate at a relatively close rotational fundamental frequency, the rotating airflows generated by the blades 73 of two adjacent fans 70 that are close to each other collide with each other. After the noise is superimposed, beat noise is generated, and its frequency is equal to the difference in the rotational fundamental frequencies of the multiple fans 70. The beat noise has a low-frequency characteristic, which can easily make users feel uncomfortable.

[0104] Based on this, in order to reduce the noise generated by the fan 70 during operation, at least a portion of the side outside the air guide hole 643 close to the outdoor heat exchanger 30 is tilted toward the direction close to the suction surface 731.

[0105] In this way, the airflow direction where two adjacent fans 70 are close to each other can be improved, the impact between the airflows can be reduced, and the pulsating pressure between the fans 70 can be reduced, thereby reducing the generation of flapping noise between the adjacent fans 70.

[0106] It is understandable that the pressure surface 732 which is away from the end of the hub 72 and is arranged on the side of the air guide hole 643 close to the outdoor heat exchanger 30 can be partially inclined toward the direction close to the suction surface 731 or can be completely inclined toward the direction close to the suction surface 731.

[0107] For example, Figure 11 and Figure 12 As shown, Figure 11 This is a fourth structural diagram of a blade provided in an embodiment of the present application. Figure 12This is the fifth structural diagram of a blade provided in an embodiment of the present application. The pressure surface 732 is away from one end of the hub 72 and is arranged on the side of the air guide hole 643 close to the outdoor heat exchanger 30, and is all inclined toward the direction close to the suction surface 731.

[0108] In this way, the shape of the pressure surface 732 on the side close to the outdoor heat exchanger 30 can be optimized, thereby improving the flow direction of the airflow in this area and reducing the generation of flapping noise between adjacent fans 70.

[0109] In some other embodiments, such as Figure 13 and Figure 14 As shown, Figure 13 This is a sixth structural diagram of a blade provided in an embodiment of the present application. Figure 14 This is the seventh structural diagram of a blade provided in an embodiment of the present application. In the multi-fan air conditioner 1000, along the axial direction F1 of the hub 72, the pressure surface 732 is set to be inclined in a direction close to the suction surface 731 away from one end of the hub 72.

[0110] It can be understood that the shape of the end of the pressure surface 732 away from the hub 72 is improved, which can improve the flow direction of the airflow along the end of the pressure surface 732 away from the hub 72.

[0111] In this way, on the one hand, the intensity of the tip vortex can be reduced, and the noise generated by the collision of the tip vortex with the main airflow can be reduced. On the other hand, the flapping noise generated between the blades 73 of adjacent fans 70 can be reduced, thereby reducing the noise of the air conditioner 1000 from multiple aspects, and the noise reduction effect is better.

[0112] In some embodiments, as Figure 15 As shown, Figure 15 This is one of the schematic cross-sectional views of a blade according to an embodiment of the present application. The pressure surface 732 may include a first sub-surface 7321 and a second sub-surface 7324. The first sub-surface 7321 has opposing first and second ends 7322 and 7323, and the second sub-surface 7324 has opposing third and fourth ends 7325 and 7326. The fourth end 7326 is connected to the hub 72.

[0113] The second end 7323 is connected to the third end 7325 , and the first end 7322 is inclined relative to the second end 7323 toward the direction approaching the suction surface 731 .

[0114] In this way, for example, in a single-fan air conditioner 1000, at least the portion of the end of the pressure surface 732 located within the air guide hole 643 away from the hub 72 can be tilted toward the suction surface 731. This can reduce the pressure on the first sub-surface 7321, narrowing the pressure difference between the first sub-surface 7321 and the suction surface 731 at that location, thereby reducing the intensity of the tip vortex, reducing the noise generated by the collision of the tip vortex with the main airflow, and reducing the noise generated during the operation of the fan 70.

[0115] For example, in a multi-fan air conditioner 1000, the end of the pressure surface 732 away from the hub 72 is located on the side of the air guide ring 64 near the mounting cavity 61 and is inclined toward the suction surface 731. This improves the airflow direction where two adjacent fans 70 are close to each other, reduces the impact between the airflows, and lowers the pulsating pressure between the fans 70, thereby reducing the generation of flapping noise between adjacent fans 70.

[0116] It is understood that a smooth transition can be provided between the second end 7323 of the first sub-surface 7321 and the third end 7325 of the second sub-surface 7324, which helps reduce wind resistance. In this case, along the axial direction of the hub 72, the intersection line between the second end 7323 and the third end 7325 is the line formed by the point of the pressure surface 732 closest to the air outlet, thereby changing the flow direction of the airflow.

[0117] In some embodiments, as Figure 16 As shown, Figure 16 The second schematic diagram of the cross-sectional structure of a blade provided in an embodiment of the present application, wherein the reference surface 733 is perpendicular to the rotation axis 721, and the first angle α between the first sub-surface 7321 and the reference surface 733 is greater than 0°, so that the first end 7322 can be tilted relative to the second end 7323 toward the direction close to the suction surface 731.

[0118] It is understood that if the first angle α is too large, the airflow will generate greater turbulence at the end of the blade 73 away from the hub 72, increasing air resistance and causing more noise when the fan 70 is operating. Based on this, the first angle α between the first sub-surface 7321 and the reference surface 733 can also be set to be less than or equal to 36°.

[0119] Exemplarily, the first angle α can be 2°, 6°, 10°, 14°, 18°, 22°, 26°, 30°, 34° and 36°, and can be flexibly adjusted according to actual conditions.

[0120] In some embodiments, as Figure 13 and Figure 14As shown, along the axial direction F1 of the hub 72 and from the pressure surface 732 to the suction surface 731 , the distance between the second end 7323 and the hub 72 gradually increases.

[0121] It should be noted that when blade 73 rotates, the dynamic and static pressures of the airflow on pressure side 732 and suction side 731 of blade 73 differ, resulting in a pressure differential between pressure side 732 and suction side 731. This in turn generates a tip vortex, which results in high noise. The spacing between second end 7323 and hub 72 can affect the direction of the airflow, further affecting the pressure differential between pressure side 732 and suction side 731.

[0122] It can be understood that since the closer to the outlet 645 of the air guide hole 643, the greater the pressure difference between the pressure surface 732 and the suction surface 731 of the blade 73, by setting the axial direction F1 along the hub 72 and pointing from the pressure surface 732 to the suction surface 731, the distance between the second end 7323 and the hub 72 gradually increases, which can effectively improve the pressure difference between the pressure surface 732 and the suction surface 731 at the end away from the hub 72, reduce the strength of the tip vortex, and thus reduce the noise generated by the tip vortex.

[0123] In some embodiments, along the axial direction F1 of the hub 72 , the distance between the endpoint of the second end 7323 close to the air outlet 63 and the rotation axis 721 is defined as R1 , and the distance from the rotation axis 721 to the end of the blade 73 away from the hub 72 is defined as the rotation radius R0 .

[0124] The ratio of R1 to the rotation radius R0 of the plurality of blades 73 is greater than or equal to 0.9. It is understood that setting the ratio to be greater than or equal to 0.9 can reduce the concentration of airflow toward the hub 72 of the fan 70, thereby improving the work capacity of the fan 70 and further increasing the wind output of the fan 70.

[0125] In addition, the ratio of R1 to the rotation radius R0 of the plurality of blades 73 may be less than or equal to 0.94. It is understood that setting the ratio to less than or equal to 0.94 can guide the flow direction of the airflow and achieve the effect of reducing noise.

[0126] Exemplarily, a ratio of a distance R1 between an end point of the second end 7323 close to the air outlet 63 and the rotation axis 721 to a rotation radius R0 of the plurality of blades 73 may be 0.9, 0.91, 0.92, 0.93 or 0.94.

[0127] In some embodiments, the air guide hole 643 has an inlet 644 and an outlet 645 that are opposite each other. Along the axial direction F1 of the hub 72, the inlet 644 is located on the side of the outlet 645 that is closer to the outdoor heat exchanger 30. The distance between the intersection of the plane of the second end 7323 and the inlet 644 and the rotation axis 721 is R2, and the ratio of R2 to the rotation radius R0 of the blade 73 is greater than or equal to 0.94.

[0128] It can be understood that setting the ratio to be greater than or equal to 0.94 can reduce the intensity of the tip vortex, thereby achieving the effect of reducing noise.

[0129] In addition, the ratio of R2 to the rotation radius R0 of the blade 73 can be less than or equal to 0.96. It is understood that setting the ratio to be less than or equal to 0.96 can guide the flow direction of the airflow and achieve the effect of reducing noise.

[0130] For example, the ratio of the distance R2 between the intersection of the second end 7323 and the plane where the inlet 644 is located and the rotation axis 721 to the rotation radius R0 of the blade 73 may be 0.94, 0.95 or 0.96.

[0131] In some embodiments, along the axial direction F1 of the hub 72, the distance between the end point of the second end 7323 away from the air outlet 63 and the rotation axis 721 is R3, and the ratio of R3 to the rotation radius R0 of the plurality of blades 73 is greater than or equal to 0.96. It will be appreciated that setting the ratio greater than or equal to 0.96 can reduce the impact between the airflows of two adjacent fans 70 near each other, thereby achieving the effect of reducing noise.

[0132] In addition, the ratio of R3 to the rotation radius R0 of the plurality of blades 73 is less than or equal to 0.98. It is understood that setting the ratio to less than or equal to 0.98 can ensure that the area of ​​the endpoint of the first sub-surface 7321 away from the air outlet 63 is small, thereby guiding the flow direction of the airflow and achieving the effect of reducing noise.

[0133] For example, a ratio of a distance R3 between an end point of the second end 7323 away from the air outlet 63 and the rotation axis 721 to a rotation radius R0 of the plurality of blades 73 may be 0.96, 0.97 or 0.98.

[0134] In some embodiments, at least a portion of the third end 7325 is located within the air guide hole 643 , and at least a portion of the third end 7325 is inclined in a direction away from the suction surface 731 .

[0135] It should be noted that the portion of the third end 7325 located in the air guide hole 643 may be partially inclined in the direction away from the suction surface 731 , or may be entirely inclined in the direction away from the suction surface 731 .

[0136] For example, Figure 15 As shown, the third end 7325 is at least partially located within the air guide hole 643, and the portion located within the air guide hole 643 is inclined in a direction away from the suction surface 731. This prevents airflow from flowing away from the rotation axis 721, thereby improving the blade 73's ability to recover radial airflow, reducing the impact of airflow on the air guide ring 64, and further reducing the noise of the fan 70.

[0137] In some embodiments, the boundary line between the second sub-surface 7324 and the first sub-surface 7321 intersects the reference line 734. The reference line 734 is tangent to the second sub-surface 7324 and intersects the rotation axis 721. The reference surface 733 is defined to be perpendicular to the rotation axis 721.

[0138] The second included angle β between the reference line 734 and the reference surface 733 may be greater than 0°. In this way, at least the portion of the third end 7325 located in the air guide hole 643 can be tilted away from the suction surface 731 .

[0139] In addition, the second angle β between the reference line 734 and the reference plane 733 can be less than or equal to 44°. It is understood that setting the second angle β to be less than or equal to 44° can reduce the air resistance when the blades 73 rotate, thereby avoiding high energy consumption when the fan 70 is running.

[0140] Exemplarily, the second angle β can be 2°, 6°, 10°, 14°, 18°, 22°, 26°, 30°, 34°, 38° or 42°, and can be flexibly adjusted according to actual conditions.

[0141] It should be noted that the first angle α can be 2°, 6°, 10°, 14°, 18°, 22°, 26°, 30°, or 34°, and the second angle β can be 2°, 6°, 10°, 14°, 18°, 22°, 26°, 30°, 34°, 38°, or 42°. The first angle α and the second angle β can be flexibly adjusted in combination with the above solutions.

[0142] As shown in Table 1, the simulation test results show that when the wind volume reaches 6000m 3 / h, the noise measured by using the fan in the related technology is 58.5dB, while by using the technical solution in the present application, the angle of the first angle α is set to 18°, and the angle of the second angle β is set to 22°, the measured noise is 56.2dB, the noise is reduced by 2.3dB, and the effect of reducing noise is more obvious.

[0143] Table 1

[0144]

[0145] As shown in Table 2, when the air volume reaches 6000m3 / h, the fan in the related art can be used, and the beat noise can be measured. However, when the technical solution in the present application is used, the angle of the first angle α is set to 18°, and the angle of the second angle β is set to 22°, no beat noise is measured, and the effect of reducing noise is more obvious.

[0146] Table 2

[0147]

[0148] For example, the simulation test results show that Figure 17 As shown, Figure 17 A schematic diagram of a pressure simulation for a blade provided in an embodiment of the present application. When the first angle α is set to 18°, the second angle β is set to 22°, the end of the connecting surface 7327 of the second sub-surface 7324 away from the hub 72 is tilted relative to the fourth end 7326 toward the suction surface 731, and the third end 7325 of the wind guide surface 7328 is tilted relative to the end of the wind guide surface 7328 near the connecting surface 7327 away from the suction surface 731, the maximum pressure on the pressure surface 732 of the blade 73 within the wind guide ring 64 away from the hub 72 is 464 Pa.

[0149] Compared with the existing fan 70 under the same test conditions, Figure 18 As shown, Figure 18 This is a schematic diagram of a pressure simulation of a blade in the related art. The maximum pressure of the pressure surface 732 of the blade 73 located in the air guide ring 64 at the end away from the hub 72 is 524Pa. In this embodiment, the maximum pressure of the pressure surface 732 at the end away from the hub 72 is reduced by 60Pa, which effectively reduces the pressure difference between the end of the blade 73 away from the hub 72 and the suction surface 731 there, thereby reducing the intensity of the tip vortex and reducing the noise generated during the operation of the fan 70.

[0150] In some embodiments, as Figure 19 As shown, Figure 19 This is a third schematic diagram of the cross-sectional structure of a blade provided in an embodiment of the present application. The second sub-surface 7324 may include a connecting surface 7327 and a wind guide surface 7328.

[0151] The connecting surface 7327 has a fourth end 7326. The end of the connecting surface 7327 away from the hub 72 is inclined relative to the fourth end 7326 toward the suction surface 731. The wind-guiding surface 7328 is located between the connecting surface 7327 and the first sub-surface 7321 and is connected to the connecting surface 7327 and the first sub-surface 7321. The wind-guiding surface 7328 has a third end 7325. The third end 7325 is inclined relative to the end of the wind-guiding surface 7328 near the connecting surface 7327 toward the suction surface 731.

[0152] In this way, by setting the inclined shape of the connecting surface 7327 and the wind guide surface 7328, the airflow can be blocked from flowing in the direction away from the rotation axis 721, thereby improving the blade 73's ability to recover radial airflow, reducing the impact of the airflow on the wind guide ring 64, and improving the noise reduction effect.

[0153] In some other embodiments, in the multi-fan air conditioner 1000 , the air conditioner 1000 further includes at least one partition 80 . The partition 80 is disposed in the installation cavity 61 and divides the installation cavity 61 into a plurality of sub-cavities 611 .

[0154] For example, Figure 20 As shown, Figure 20 This is a fourth schematic diagram of a cross-sectional structure of a blade provided in an embodiment of the present application. The dual-fan air conditioner 1000 includes a partition 80.

[0155] It is understood that the partition 80 is disposed within the mounting cavity 61 and divides the mounting cavity 61 into two sub-cavities 611. Each air guide hole 643 corresponds to a sub-cavity 611, and the air guide hole 643 is connected to the corresponding sub-cavity 611. Each fan 70 corresponds to a sub-cavity 611 and is located within the corresponding sub-cavity 611. The fan 70 is used to drive the gas within the sub-cavity 611 to be discharged through the corresponding air guide hole 643.

[0156] In this way, by providing the partition 80, the mutual interference of the airflows between the multiple fans 70 can be reduced, thereby reducing the flapping noise between the airflows.

[0157] It is understandable that there can also be a smooth transition between the wind guide surface 7328 and the connecting surface 7327, which is conducive to reducing wind resistance.

[0158] In some other embodiments, such as Figure 21 As shown, Figure 21 The third structural diagram of an outdoor unit provided in an embodiment of the present application, in a multi-fan air conditioner 1000, the distance between the rotation axis 721 of each two adjacent hubs 72 is H, and the ratio of H to the rotation diameter D of the multiple blades 73 of each fan 70 is greater than or equal to 1.08.

[0159] For example, the ratio of the distance H between the rotation axes 721 of each two adjacent hubs 72 to the rotation diameter D of the plurality of blades 73 of each fan 70 may be 1.08, 1.1, 1.15 or 1.2.

[0160] It is understandable that if the ratio is less than 1.08, the spacing between the multiple fans 70 is too small, which increases the intensity of the flapping noise between the fans, and the blades 73 between the multiple fans 70 are prone to collision, which does not meet the design requirements.

[0161] In some embodiments, as Figure 22 As shown, the suction surface 731 further includes a flow guiding structure 7311 , and the flow guiding structure 7311 is distributed on the suction surface 731 in a vein-like manner.

[0162] It is understood that by providing the guide structure 7311, the direction and speed of the airflow on the suction surface 731 can be changed. In this way, the airflow can generate a suction effect during the flow process, so that the airflow can be closer to the suction surface 731, reducing the radial flow of the airflow, increasing the airflow speed and wind output, and improving the air supply effect.

[0163] Although the present application is described herein in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art may understand and implement other variations of the disclosed embodiments by reviewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprise" does not exclude other components or steps, and "a" or "an" does not exclude multiple situations. A single processor or other unit may implement several functions listed in the claims. The fact that certain measures are recorded in different dependent claims does not mean that these measures cannot be combined to produce good results.

[0164] Although the present application has been described with reference to specific features and embodiments thereof, it is apparent that various modifications and combinations may be made thereto without departing from the spirit and scope of the present application. Accordingly, this specification and the drawings are merely illustrative of the present application as defined by the appended claims and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art may make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, the present application is intended to include such modifications and variations as fall within the scope of the claims of the present application and their equivalents.

[0165] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An air conditioner, characterized in that: include: A housing having a mounting cavity and an air outlet communicating with the mounting cavity; a heat exchanger, the heat exchanger being disposed in the installation cavity; An air guide ring, arranged at the air outlet and having air guide holes; a fan, located in the installation cavity and used to drive the gas in the installation cavity to be discharged through the air guide hole; The fan comprises: a hub having an axis of rotation; A plurality of blades are connected to the hub and are spaced apart along the circumference of the hub; each blade has a suction surface and a pressure surface facing each other; a motor connected to the wheel hub, and configured to drive the wheel hub to rotate about the rotation axis; Wherein, along the axial direction of the hub, at least a portion of the end of the pressure surface away from the hub is located in the air guide hole, and the portion located in the air guide hole is inclined toward the direction close to the suction surface.

2. The air conditioner according to claim 1, characterized in that The pressure surface comprises: a first sub-surface, at least partially located in the air guide hole, and having a first end and a second end opposite to each other; The second sub-surface has a third end and a fourth end opposite to each other; the fourth end is connected to the wheel hub; The second end is connected to the third end, and the first end is inclined relative to the second end toward the direction approaching the suction surface.

3. The air conditioner according to claim 2, characterized in that A first included angle between the first sub-surface and a reference surface is greater than 0° and less than or equal to 36°, and the reference surface is perpendicular to the rotation axis.

4. The air conditioner according to claim 2, characterized in that Along the axial direction of the hub, and from the pressure surface to the suction surface, the distance between the second end and the hub gradually increases.

5. The air conditioner according to claim 4, characterized in that Along the axial direction of the hub, a ratio of a distance between an end point of the second end close to the air outlet and the rotation axis to a rotation radius of the plurality of blades is 0.9 to 0.

94.

6. The air conditioner according to claim 4, characterized in that The air guide hole has an inlet and an outlet opposite to each other; along the axial direction of the hub, the inlet is located on a side of the outlet close to the heat exchanger; A ratio of a distance between an intersection of a plane where the second end and the inlet are located and the rotation axis to a rotation radius of the plurality of blades is 0.94 to 0.

96.

7. The air conditioner according to any one of claims 2 to 6, characterized in that: The third end is at least partially located in the air guide hole, and at least partially inclined in a direction away from the suction surface.

8. The air conditioner according to claim 7, characterized in that A boundary line between the second sub-surface and the first sub-surface intersects with a reference line; the reference line is tangent to the second sub-surface and intersects with the rotation axis; Wherein, a second included angle between the reference line and the reference plane is greater than 0° and less than or equal to 44°, and the reference plane is perpendicular to the rotation axis.

9. The air conditioner according to claim 7, characterized in that The second sub-surface includes: The connecting surface has the fourth end, and an end of the connecting surface away from the hub is inclined relative to the fourth end toward the direction approaching the suction surface; The wind guide surface is located between the connecting surface and the first sub-surface, and is connected to the connecting surface and the first sub-surface; the wind guide surface has the third end, and the third end is inclined relative to the end of the wind guide surface close to the connecting surface toward the direction away from the suction surface.

10. An air conditioner, characterized in that: include: A housing having a mounting cavity and an air outlet communicating with the mounting cavity; a heat exchanger, the heat exchanger being disposed in the installation cavity; An air guide ring, arranged at the air outlet and having air guide holes; a fan located in the installation cavity and configured to drive the gas in the installation cavity to be discharged through the air guide hole; The fan comprises: a hub having an axis of rotation; A plurality of blades are connected to the hub and are spaced apart along the circumference of the hub; each blade has a suction surface and a pressure surface facing each other; a motor connected to the wheel hub, and configured to drive the wheel hub to rotate about the rotation axis; Wherein, along the axial direction of the hub, at least a portion of an end of the pressure surface away from the hub is located in the air guide hole, and at least a portion located in the air guide hole is inclined toward the direction close to the suction surface.

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