Fan, air conditioner outdoor unit and air conditioner

Abstract

The invention discloses a fan, an air conditioner outdoor unit and an air conditioner. The fan comprises a driving mechanism, a first impeller and a second impeller. The first impeller comprises a first hub and a plurality of first blades arranged on the first hub, and the first blades are arranged in the circumferential direction of the first hub at intervals. The first hub is in transmission connection with the driving mechanism. The second impeller and the first impeller are connected in series and stacked in the axial direction of the fan, the second impeller comprises a second hub and a plurality of second blades arranged on the second hub, and the second blades are arranged in the circumferential direction of the second hub at intervals. And the second hub is in transmission connection with the driving mechanism. And the rotating direction of the first blade is the same as that of the second blade. The fan can improve the air outlet amount and is beneficial to improving the heat exchange efficiency of the outdoor unit of the air conditioner, so that the use experience of a user on the air conditioner is improved.

Description

Fans, outdoor air conditioning units and air conditioners Technical Field

[0001] This disclosure relates to the field of air conditioner technology, and in particular to a fan, an outdoor air conditioner unit, and an air conditioner. Background Technology

[0002] With the development of society and the economy and the improvement of people's living standards, air conditioners have gradually become an indispensable household appliance. Air conditioners can regulate parameters such as temperature and humidity of the ambient air to provide users with a comfortable environment.

[0003] In related technologies, as the cooling capacity demand of air conditioners increases, the required air volume of air conditioners shows a significant upward trend. Under specific speed and noise requirements, most air conditioners currently adopt a solution of increasing the impeller diameter to increase the air volume of the fan. However, this increases the size of the fan, resulting in a larger space occupied by the fan in the air conditioner. Summary of the Invention

[0004] In view of this, the present disclosure provides a fan, an outdoor air conditioning unit, and an air conditioner. The impeller can effectively increase the air volume of the fan without increasing its diameter, which is beneficial to improving the heat exchange efficiency of the outdoor air conditioning unit and avoids the fan taking up additional space in the air conditioner.

[0005] Specifically, this disclosure is achieved through the following technical solution.

[0006] According to a first aspect of the present disclosure, a fan is provided, comprising a drive mechanism, a first impeller, and a second impeller. The first impeller includes a first hub and a plurality of first blades disposed on the first hub, the plurality of first blades being spaced apart circumferentially along the first hub. The first hub is drive-connected to the drive mechanism. The second impeller is connected in series with the first impeller along the axial direction of the fan, and includes a second hub and a plurality of second blades disposed on the second hub, the plurality of second blades being spaced apart circumferentially along the second hub. The second hub is drive-connected to the drive mechanism. The rotation direction of the first blades is the same as the rotation direction of the second blades.

[0007] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: During the assembly of the fan, the first hub and the second hub are respectively connected by a transmission mechanism, and the first impeller and the second impeller are arranged in series and stacked along the axial direction of the fan. When the fan is working, the drive mechanism can drive the first hub to rotate, causing multiple first blades spaced apart circumferentially on the first hub to rotate. The drive mechanism can also drive the second hub to rotate, causing multiple second blades spaced apart circumferentially on the second hub to rotate. During the driving process, the drive mechanism can drive the first and second impellers to rotate, and the rotation direction of the first blades is the same as that of the second blades, avoiding noise caused by airflow collision when the rotation directions are opposite. Furthermore, the air volume of the fan can be increased without increasing the impeller diameter. This fan adopts a series-stacked impeller structure, which improves the fan's air pressure and air volume without increasing the impeller diameter, thus improving the fan's performance. This allows the fan to meet the cooling capacity requirements of air conditioners.

[0008] The technical solution disclosed herein will be further explained below.

[0009] In one embodiment, the maximum vertical distance between the outer edge of the first blade and the central axis of the first hub is R1, and the maximum vertical distance between the outer edge of the second blade and the central axis of the second hub is R2, where 0.6R1≤R2≤1.2R1.

[0010] In one embodiment, R2 = 1.15R1. Alternatively, R2 = R1.

[0011] In one embodiment, on the radial projection plane of the fan, the first blade has a dimension of H1 along the axial direction of the fan, and the second blade has a dimension of H2 along the axial direction of the fan. Wherein, 0.05(H1+H2)≤H2≤0.5(H1+H2).

[0012] In one embodiment, H2 = 0.45(H1 + H2). Alternatively, H2 = 0.3(H1 + H2).

[0013] In one embodiment, at least one first blade is located in front of the second blade along the airflow direction of the fan.

[0014] And / or, along the airflow direction of the fan, at least one first blade is located behind the second blade.

[0015] And / or, at least one second blade is located between two adjacent first blades.

[0016] In one embodiment, the second impeller comprises two, with the first impeller sandwiched between the two second impellers.

[0017] In one embodiment, the drive mechanism includes a drive shaft connected to a first wheel hub and a second wheel hub, respectively.

[0018] In one embodiment, the first hub has a first mounting hole, and the second hub has a second mounting hole. A drive shaft passes through the first and second mounting holes, and the drive shaft has a threaded section extending beyond the first and second mounting holes. The drive mechanism also includes a lock nut screwed onto the threaded section.

[0019] In one embodiment, a limiting ring is provided at the end of the drive shaft opposite to the threaded section, and the outer diameter of the limiting ring is larger than the inner diameter of the first mounting hole and the inner diameter of the second mounting hole.

[0020] In one embodiment, the drive mechanism includes a drive shaft fixedly connected to a first wheel hub, and a second wheel hub fixedly connected to the first wheel hub.

[0021] In one embodiment, the first wheel hub and the second wheel hub are detachably and fixedly connected.

[0022] In one embodiment, one of the first wheel hub and the second wheel hub is provided with a hook and the other is provided with a hook groove, the hook being adapted to the hook groove to fix the first wheel hub and the second wheel hub together.

[0023] In one embodiment, the second blade includes a leading edge and a trailing edge disposed opposite to it in the direction of rotation of the hub. The leading edge is straight in the orthographic projection plane of the wind turbine in the axial direction.

[0024] In one embodiment, the bending direction of the first blade is the same as that of the second blade.

[0025] According to a second aspect of the present disclosure, an outdoor unit for an air conditioner is provided, including a housing and a fan as described in any of the above embodiments. The housing has a receiving cavity, the fan is disposed within the receiving cavity, and a drive mechanism is fixed to the housing.

[0026] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects: the air conditioner uses the fan in the above embodiments, and the fan can increase the air volume without increasing the impeller diameter, which is beneficial to improving the heat exchange efficiency of the air conditioner.

[0027] According to a third aspect of the present disclosure, an air conditioner is provided, including an indoor unit and an outdoor unit as described in the above embodiments, wherein the outdoor unit cooperates with the indoor unit to enable the indoor unit to provide temperature-regulating gas.

[0028] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects: the air conditioner uses the outdoor unit of the air conditioner in the above embodiments, and the outdoor unit of the air conditioner can effectively improve the heat exchange efficiency, which is beneficial to improving the user's experience of using the air conditioner.

[0029] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0030] The accompanying drawings, which form part of this disclosure, are used to provide a further understanding of this disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain this disclosure and do not constitute an undue limitation of this disclosure.

[0031] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 is a schematic diagram of the structure of an air conditioner according to an embodiment.

[0033] Figure 2 is a schematic diagram of the fan structure of the air conditioner shown in Figure 1.

[0034] Figure 3 is a schematic diagram of the exploded structure of the wind turbine shown in Figure 2.

[0035] Figure 4 is a schematic diagram of the structure of the fan shown in Figure 2.

[0036] Figure 5 is a partial structural schematic diagram of the fan shown in Figure 2.

[0037] Figure 6 is a front view structural diagram of the fan shown in Figure 2.

[0038] Figure 7 is a side view of the wind turbine shown in Figure 6.

[0039] Figure 8 is a side view of the fan structure according to another embodiment.

[0040] Figure 9 is a side view sectional structural diagram of the wind turbine shown in Figure 8.

[0041] Figure 10 is a side view of the fan structure according to another embodiment.

[0042] Figure 11 is a side view of the fan structure according to another embodiment.

[0043] Figure 12 is a schematic diagram of the structure of the first impeller of the wind turbine shown in Figure 2.

[0044] Figure 13 is a schematic diagram of the structure of the second impeller of the wind turbine shown in Figure 2.

[0045] Figure 14 is a schematic diagram of the structure of the outdoor unit of the air conditioner shown in Figure 1.

[0046] Figure 15 is a schematic diagram of the structure of the outdoor unit of the air conditioner shown in Figure 1.

[0047] Explanation of the reference numerals in the attached figures.

[0048] 1. Air conditioner; 10. Outdoor unit of air conditioner; 20. Indoor unit of air conditioner; 100. Fan; 110. Drive mechanism; 111. Drive shaft; 1111. Threaded section; 112. Locking nut; 113. Limiting ring; 120. First impeller; 121. First hub; 1211. First mounting hole; 122. First blade; 130. Second impeller; 131. Second hub; 1311. Second mounting hole; 132. Second blade; 1321. Leading edge; 1322. Trailing edge; 101. Hook; 102. Hook groove; 200. Housing; 210. Receiving cavity. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, further illustrates this application. It should be understood that the specific embodiments described herein are merely illustrative and do not limit the scope of protection of this application.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0051] With the development of society and the economy and the improvement of people's living standards, air conditioners have gradually become an indispensable household appliance. Air conditioners can regulate parameters such as temperature and humidity of the ambient air to provide users with a comfortable environment.

[0052] In related technologies, as the cooling capacity demand of air conditioners increases, the required air volume of air conditioners shows a significant upward trend. Under specific speed and noise requirements, most air conditioners currently adopt the technology of increasing the impeller diameter to increase the air volume of the fan.

[0053] Based on this, the present disclosure provides a fan, an outdoor air conditioning unit, and an air conditioner. The impeller can effectively increase the air volume of the fan without increasing its diameter, which is beneficial to improving the heat exchange efficiency of the outdoor air conditioning unit and avoids the fan taking up additional space in the air conditioner.

[0054] As shown in Figure 1, in some embodiments, the air conditioner 1 includes an indoor unit 20 and an outdoor unit 10. The outdoor unit 10 cooperates with the indoor unit 20 to enable the indoor unit 20 to provide temperature-regulating gas. In this way, the air conditioner 1 can create a comfortable environment for users by providing temperature-regulating gas, thereby improving the user's living experience.

[0055] As shown in Figures 1, 14, and 15, in some embodiments, the outdoor unit 10 of the air conditioner includes a fan 100 and a housing 200. The housing 200 has a receiving cavity 210, and the fan 100 is disposed within the receiving cavity 210. Thus, when the outdoor unit 10 is assembled, the fan 100 is positioned within the receiving cavity 210. When the outdoor unit 10 is operating, the fan 100 can rotate to improve the heat exchange efficiency of the outdoor unit 10, thereby enhancing the user experience of the outdoor unit 10.

[0056] It should be noted that the outdoor unit 10 of the air conditioner can specifically be the outdoor unit of a split air conditioner, the outdoor unit of a unit air conditioner, or the outdoor fan of a large multi-split system, etc.

[0057] As shown in Figures 2 to 5, in some embodiments, the fan 100 includes a drive mechanism 110, a first impeller 120, and a second impeller 130. The first impeller 120 includes a first hub 121 and a plurality of first blades 122 disposed on the first hub 121, the plurality of first blades 122 being spaced apart circumferentially along the first hub 121. The first hub 121 is drive-connected to the drive mechanism 110. The second impeller 130 is connected in series with the first impeller 120 along the axial direction of the fan 100. The second impeller 130 includes a second hub 131 and a plurality of second blades 132 disposed on the second hub 131, the plurality of second blades 132 being spaced apart circumferentially along the second hub 131. The second hub 131 is drive-connected to the drive mechanism 110. The rotation direction of the first blades 122 is the same as the rotation direction of the second blades 132.

[0058] Thus, during the assembly of the fan 100, the first hub 121 and the second hub 131 are respectively connected by a transmission, and the first impeller 120 and the second impeller 130 are arranged in series and stacked along the axial direction of the fan 100. When the fan 100 is working, the drive mechanism 110 can drive the first hub 121 to rotate, so that a plurality of first blades 122 arranged circumferentially on the first hub 121 rotate. The drive mechanism 110 can drive the second hub 131 to rotate, so that a plurality of second blades 132 arranged circumferentially on the second hub 131 rotate. During the driving process, the drive mechanism 110 can drive the first impeller 120 and the second impeller 130 to rotate, and the rotation direction of the first blades 122 is the same as that of the second blades 132, avoiding noise caused by collision of the airflow in the fan 100 when the rotation directions are opposite. Furthermore, the air volume of the fan 100 can be increased without increasing the diameter of the impellers. The fan 100 adopts a series-stacked impeller structure, which increases the air pressure and air volume of the fan 100, improving its performance. This enables the fan 100 to meet the cooling capacity requirements of air conditioners 1. The series-stacked impeller structure allows for increased air volume of the fan 100, meeting the needs of large-capacity cooling units and solving the problems of miniaturization, low cost, and installation space availability for existing large-capacity cooling units.

[0059] It should be noted that there are several ways to achieve the transmission connection between the drive mechanism 110 and the first wheel hub 121 and the second wheel hub 131, including direct connection to achieve transmission connection (such as the drive mechanism 110 being fixedly connected to the wheel hub) and transmission connection through a transmission unit (such as gear transmission, etc.).

[0060] As shown in Figures 1, 14, and 15, in some embodiments, the drive mechanism 110 is fixed to the housing 200. Thus, when the outdoor unit 10 of the air conditioner is assembled, the fan 100 is installed in the receiving cavity 210, and the drive mechanism 110 is fixed to the housing 200, so that the drive mechanism 110 can drive the first impeller 120 and the second impeller 130 to rotate.

[0061] As shown in Figures 1, 14, and 15, in some embodiments, the drive mechanism 110 drives the first impeller 120 and the second impeller 130 to rotate in the same direction. Thus, when the fan 100 is operating, the drive mechanism 110 activates to drive the first impeller 120 and the second impeller 130 to rotate in the same direction, and the first blade 122 and the second blade 132 rotate in the same direction, thereby increasing the airflow of the fan 100, improving the heat exchange efficiency of the outdoor unit 10 of the air conditioner, and ultimately enhancing the user experience of the air conditioner 1.

[0062] As shown in Figure 6, in some embodiments, the maximum vertical distance between the outer edge of the first blade 122 and the central axis of the first hub 121 is R1, and the maximum vertical distance between the outer edge of the second blade 132 and the central axis of the second hub 131 is R2, where 0.6R1≤R2≤1.2R1. Thus, the fan 100 adopts a structure in which the first impeller 120 and the second impeller 130 are connected in series along the axial direction of the fan 100, and the design of 0.6R1≤R2≤1.2R1 optimizes and strengthens the tip region for efficient operation, thereby improving the tip vortex structure characteristics and the spectral characteristics of the fan 100, effectively reducing low-frequency discrete noise, improving sound quality, and suppressing broadband aerodynamic noise caused by tip vortices. This is beneficial for improving the user experience of the fan 100, the outdoor air conditioning unit 10, and the air conditioner 1 that utilize this impeller.

[0063] In some embodiments, 0.6R1≤R2≤1.15R1.

[0064] In some embodiments, 0.6R1≤R2≤R1.

[0065] In some embodiments, 0.6R1≤R2≤0.9R1.

[0066] In some embodiments, 0.6R1≤R2≤0.8R1.

[0067] In some embodiments, 0.7R1≤R2≤1.2R1.

[0068] In some embodiments, 0.9 = 7R1 ≤ R2 ≤ 1.15R1.

[0069] In some embodiments, 0.9R1≤R2≤1.15R1.

[0070] In some embodiments, 0.95R1≤R2≤1.2R1.

[0071] In some embodiments, 0.65R1≤R2≤R1.

[0072] In some embodiments, 0.75R1≤R2≤R1.

[0073] In some embodiments, 0.85R1≤R2≤R1.

[0074] In some embodiments, 0.95R1≤R2≤R1.

[0075] In some embodiments, 0.85R1≤R2≤1.15R1.

[0076] In some embodiments, 0.95R1≤R2≤1.15R1.

[0077] It should be noted that there are several ways to implement R2, including R2 being 0.85R1, 0.9R1, 0.95R1, R1, 1.1R1, 1.15R1, and 1.2R1, etc. The specific settings can be made according to actual needs, and will not be elaborated further here.

[0078] It should be noted that the specific size of the air conditioner 1 can be implemented in various ways, including 1 horsepower, 1.5 horsepower, 2 horsepower, 3 horsepower and 4 horsepower, etc.

[0079] As shown in Figures 7 to 9, in some embodiments, on the radial projection plane of the fan 100, the dimension of the first blade 122 along the axial direction of the fan 100 is H1, and the dimension of the second blade 132 along the axial direction of the fan 100 is H2. Wherein, 0.05(H1+H2)≤H2≤0.5(H1+H2). Thus, by designing the dimensions H1 of the first blade 122 along the axial direction of the fan 100 and H2 of the second blade 132 along the axial direction of the fan 100 to be 0.05(H1+H2)≤H2≤0.6(H1+H2), the operating air volume of the fan 100 can be effectively increased, while the noise generated by the fan 100 during operation can also be effectively reduced.

[0080] It should be noted that the view shown in Figure 9 is the radial projection of the fan 100.

[0081] In some embodiments, 0.05(H1+H2)≤H2≤0.5(H1+H2).

[0082] In some embodiments, 0.05(H1+H2)≤H2≤0.45(H1+H2).

[0083] In some embodiments, 0.05(H1+H2)≤H2≤0.4(H1+H2).

[0084] In some embodiments, 0.05(H1+H2)≤H2≤0.3(H1+H2).

[0085] In some embodiments, 0.05(H1+H2)≤H2≤0.2(H1+H2).

[0086] In some embodiments, 0.05(H1+H2)≤H2≤0.1(H1+H2).

[0087] In some embodiments, 0.3(H1+H2)≤H2≤0.5(H1+H2).

[0088] In some embodiments, 0.3(H1+H2)≤H2≤0.45(H1+H2).

[0089] In some embodiments, 0.3(H1+H2)≤H2≤0.4(H1+H2).

[0090] As shown in Figures 6 and 9, in some embodiments, H2 = 0.45(H1 + H2).

[0091] As shown in Figures 6 and 9, in some embodiments, H2 = 0.3(H1 + H2).

[0092] As shown in Figures 6 and 9, in some embodiments, R2 = 1.15R1.

[0093] As shown in Figures 6 and 9, in some embodiments, R2 = R1.

[0094] In some embodiments, R2=1.15R1 and H2=0.45(H1+H2) are designed. Using these parameters, the fan 100 designed for the same size and specifications as the air conditioner outdoor unit 10 fan 100 has a 56% increase in working air volume, a 20% reduction in fan size, and a 2dBA reduction in noise for the same air volume.

[0095] In some embodiments, R2=R1 and H2=0.3(H1+H2) are designed. Using these parameters, the fan 100 has an 8% smaller impeller diameter, a 14% lower weight, and a 2.5 dBA lower noise level for the same air volume compared to the air conditioner outdoor unit 10 fan 100 of the same size.

[0096] As shown in Figures 7 to 9, in some embodiments, at least one first blade 122 is located in front of the second blade 132 along the airflow direction of the fan 100. Thus, when the first impeller 120 and the second impeller 130 are arranged in series and stacked along the axial direction of the fan 100, placing at least one first blade 122 in front of the second blade 132 reduces the noise of the fan 100 during operation, increases the air pressure and air volume of the fan 100, and improves the performance of the fan 100.

[0097] It should be noted that there are several ways to implement at least one first blade 122 in front of the second blade 132, including one, two, three or more first blades 122 in the first impeller 120 being in front of the second blade 132, and the first impeller 120 and the second impeller 130 being spaced apart so that all the first blades 122 of the first impeller 120 are in front of the second blade 132.

[0098] As shown in Figures 7 to 9, in some embodiments, at least one first blade 122 is located behind the second blade 132 along the airflow direction of the fan 100. Thus, when the first impeller 120 and the second impeller 130 are arranged in series and stacked along the axial direction of the fan 100, placing at least one first blade 122 behind the second blade 132 reduces the noise of the fan 100 during operation, increases the air pressure and airflow of the fan 100, and improves the performance of the fan 100.

[0099] It should be noted that there are several ways to implement at least one first blade 122 being located behind the second blade 132. These include one, two, three or more first blades 122 of the first impeller 120 being located behind the second blade 132, and the first impeller 120 and the second impeller 130 being spaced apart so that all the first blades 122 of the first impeller 120 are located behind the second blade 132.

[0100] As shown in Figures 7 to 9, in some embodiments, at least one second blade 132 is located between two adjacent first blades 122. Thus, when the first impeller 120 and the second impeller 130 are arranged in series along the axial direction of the fan 100, placing at least one second blade 132 between two adjacent first blades 122 can reduce the noise of the fan 100 during operation, increase the wind pressure and air volume of the fan 100, and improve the performance of the fan 100.

[0101] It should be noted that there are various ways to implement at least one second blade 132 between two adjacent first blades 122, including providing one, two, three or more second blades 132 between two adjacent first blades 122, and in the first impeller 120, each of the two adjacent first blades 122 is provided with a second blade 132.

[0102] As shown in Figures 10 and 11, in some embodiments, the second impeller 130 includes two impellers, with the first impeller 120 sandwiched between the two second impellers 130. Thus, by providing two second impellers 130 and sandwiching the first impeller 120 between the two impellers, the airflow and volume of the fan 100 can be further improved without increasing the heat exchange efficiency of the outdoor unit 10 of the air conditioner.

[0103] It should be noted that the number of the first impeller 120 can be one, two, three, etc., and the number of the second impeller 130 can be one, two, three, etc. The specific air conditioner is set according to actual needs.

[0104] As shown in Figures 2 to 4, in some embodiments, the drive mechanism 110 includes a drive shaft 111, which is connected to a first hub 121 and a second hub 131, respectively. Thus, by connecting the drive shaft 111 to the first hub 121 and the second hub 131, when the fan 100 is operating, the drive mechanism 110 drives the first hub 121 and the second hub 131 to rotate via the drive shaft 111, thereby driving the first impeller 120 and the second impeller 130 to rotate. This drive method has a simple structure, is easy to implement, and is convenient to assemble.

[0105] As shown in Figures 2 to 4, 9, and 14, in some embodiments, the first hub 121 has a first mounting hole 1211, and the second hub 131 has a second mounting hole 1311. A drive shaft 111 passes through the first mounting hole 1211 and the second mounting hole 1311. The drive shaft 111 has a threaded section 1111 extending out of the first mounting hole 1211 and the second mounting hole 1311. The drive mechanism 110 also includes a locking nut (not shown), which is screwed onto the threaded section 1111. Thus, by providing the first mounting hole 1211 in the first hub 121 and the second mounting hole 1311 in the second hub 131, a certain configuration is achieved. When the fan 100 is assembled, the drive shaft 111 of the drive mechanism 110 passes through the first mounting hole 1211 and the second mounting hole 1311, and the drive shaft 111 has a threaded section 1111 extending out of the first mounting hole 1211 and the second mounting hole 1311. A lock nut is used to screw into the threaded section 1111 to realize the assembly of the fan 100. This drive method is simple and easy to assemble.

[0106] As shown in Figures 2 to 4, Figure 9 and Figure 14, in some embodiments, a limiting ring 113 is provided at the end of the drive shaft 111 opposite to the threaded section 1111. The outer diameter of the limiting ring 113 is larger than the inner diameter of the first mounting hole 1211 and the inner diameter of the second mounting hole 1311. Thus, when the fan 100 is assembled, the first hub 121 and the second hub 131 are mounted on the drive shaft 111. The drive shaft 111 includes a limiting ring 113 opposite to the threaded section 1111. The outer diameter of the limiting ring 113 is larger than the inner diameter of the first mounting hole 1211 and the inner diameter of the second mounting hole 1311. This allows the first impeller 120 and the second impeller 130 to be limited by the limiting ring 113 and the locking nut when the first impeller 120 and the second impeller 130 are mounted on the drive shaft. This prevents the first impeller 120 and the second impeller 130 from having additional movement and causing motion interference when the fan 100 is working, thereby improving the reliability of the fan 100.

[0107] As shown in Figures 2 to 4, in some embodiments, the drive mechanism 110 includes a drive shaft 111, which is fixedly connected to a first hub 121, and a second hub 131 is fixedly connected to the first hub 121. Thus, during the assembly of the fan 100, the drive shaft 111 of the drive mechanism 110 is fixedly connected to the first hub 121, allowing the drive mechanism 110 to drive the first impeller 120 to rotate. The second hub 131 is fixedly connected to the first hub 121, so that when the first hub 121 rotates, it can drive the second hub 131 to rotate, thereby allowing the drive mechanism 110 to drive the second hub 131 through the first hub 121. This driving method uses only one drive mechanism 110 to drive both the first impeller 120 and the second impeller 130, making the driving method simple, easy to implement, and structurally simple.

[0108] As shown in Figures 2 to 4, in some embodiments, the first hub 121 and the second hub 131 are detachably and fixedly connected. By designing the first hub 121 and the second hub 131 to be detachably and fixedly connected, it facilitates the maintenance or replacement of the first impeller 120 or the second impeller 130, improving the maintenance efficiency of the fan 100. Furthermore, the first impeller 120 and the second impeller 130 can be manufactured separately and then assembled, which helps improve the manufacturing efficiency of the first impeller 120 and the second impeller 130.

[0109] As shown in Figures 2 to 4, in some embodiments, one of the first hub 121 and the second hub 131 is provided with a hook 101, and the other is provided with a hook groove 102. The hook 101 is adapted to the hook groove 102 to fix the first hub 121 and the second hub 131 together. Thus, by providing a hook 101 in one of the first hub 121 and the hook groove 102 in the other, the hook 101 can engage with the hook groove 102 during the assembly of the fan 100 to fix the first hub 121 and the second hub 131 together. This allows the drive shaft 111 of the drive mechanism 110 to drive the first hub 121 to rotate, and the first hub 121 can simultaneously drive the second hub 131, causing the first impeller 120 and the second impeller 130 to rotate synchronously.

[0110] It should be noted that the specific implementation of one of the first wheel hub 121 and the second wheel hub 131 having a hook portion 101 and the other having a hook groove 102 includes the first wheel hub 121 having a hook portion 101 and the second wheel hub 131 having a hook groove 102; and the first wheel hub 121 having a hook groove 102 and the second wheel hub 131 having a hook portion 101.

[0111] As shown in Figures 12 and 13, in some embodiments, the second blade 132 includes a leading edge 1321 and a trailing edge 1322 disposed opposite to it in the rotational direction of the hub. In the orthographic projection plane of the fan 100 in the axial direction, the leading edge 1321 is a straight line. Thus, by designing the leading edge 1321 of the second blade 132 to be a straight line in the orthographic projection plane of the fan 100 in the axial direction, the airflow of the fan 100 can be effectively increased, the noise of the fan 100 during operation can be reduced, and the space occupied by the secondary blades in the fan 100 can be reduced.

[0112] In some embodiments, the leading edge 1321 is a curve, arc, or wavy line on the orthographic projection plane of the fan 100 in the axial direction.

[0113] It should be noted that the view shown in Figure 6 is the orthographic projection of the fan 100 in the axial direction.

[0114] As shown in Figures 7 to 9, in some embodiments, the bending direction of the first blade 122 is the same as the bending direction of the second blade 132. Thus, by designing the bending direction of the first blade 122 to be the same as that of the second blade 132, when the fan 100 is operating, the drive mechanism 110 drives the hub to simultaneously drive the first blade 122 and the second blade 132 to rotate. The fact that the first blade 122 and the second blade 132 have the same bending direction effectively increases the airflow of the fan 100.

[0115] The above embodiments are merely illustrative of several implementation methods of this disclosure, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of this disclosure, and these modifications and improvements all fall within the protection scope of this disclosure.

Claims

1. A fan, characterized in that, include: Drive mechanism; A first impeller includes a first hub and a plurality of first blades disposed on the first hub, the plurality of first blades being spaced apart circumferentially along the first hub; the first hub is drive-connected to the drive mechanism; and a second impeller is connected in series with the first impeller along the axial direction of the fan, the second impeller including a second hub and a plurality of second blades disposed on the second hub, the plurality of second blades being spaced apart circumferentially along the second hub; the second hub is drive-connected to the drive mechanism; wherein the rotation direction of the first blades is the same as the rotation direction of the second blades.

2. The fan according to claim 1, characterized in that, The maximum vertical distance between the outer edge of the first blade and the central axis of the first hub is R1, and the maximum vertical distance between the outer edge of the second blade and the central axis of the second hub is R2, where 0.6R1≤R2≤1.2R1.

3. The fan according to claim 2, characterized in that, R2 = 1.15R1; or, R2 = R1.

4. The fan according to claim 1, characterized in that, On the radial projection plane of the fan, the dimension of the first blade along the axial direction of the fan is H1, and the dimension of the second blade along the axial direction of the fan is H2; wherein, 0.05(H1+H2)≤H2≤0.5(H1+H2).

5. The fan according to claim 4, characterized in that, H2 = 0.45(H1 + H2); or, H2 = 0.3(H1 + H2).

6. The fan according to claim 1, characterized in that, Along the airflow direction of the fan, at least one of the first blades is located in front of the second blade; And / or, along the airflow direction of the fan, at least one of the first blades is located behind the second blade; And / or, at least one of the second blades is located between two adjacent first blades.

7. The fan according to claim 1, characterized in that, The second impeller comprises two impellers, with the first impeller sandwiched between the two second impellers.

8. The fan according to claim 1, characterized in that, The drive mechanism includes a drive shaft, which is connected to the first wheel hub and the second wheel hub respectively.

9. The fan according to claim 8, characterized in that, The first hub has a first mounting hole, and the second hub has a second mounting hole; the drive shaft passes through the first mounting hole and the second mounting hole, and the drive shaft has a threaded section extending out of the first mounting hole and the second mounting hole; the drive mechanism also includes a locking nut, which is screwed onto the threaded section.

10. The fan according to claim 9, characterized in that, The drive shaft is provided with a limiting ring at one end opposite to the threaded section. The outer diameter of the limiting ring is larger than the inner diameter of the first mounting hole and the inner diameter of the second mounting hole.

11. The fan according to claim 1, characterized in that, The drive mechanism includes a drive shaft, which is fixedly connected to the first wheel hub, and the second wheel hub is fixedly connected to the first wheel hub.

12. The fan according to claim 11, characterized in that, The first wheel hub and the second wheel hub are detachably and fixedly connected.

13. The fan according to claim 12, characterized in that, One of the first wheel hub and the second wheel hub is provided with a hook and the other is provided with a hook groove. The hook is adapted to the hook groove so that the first wheel hub and the second wheel hub are fixedly connected.

14. The fan according to any one of claims 1 to 13, characterized in that, The second blade includes a leading edge and a trailing edge disposed opposite to each other along the rotational direction of the hub; the leading edge is a straight line in the orthographic projection plane of the axial direction of the wind turbine.

15. The fan according to any one of claims 1 to 13, characterized in that, The bending direction of the first blade is the same as that of the second blade.

16. An outdoor unit for an air conditioner, characterized in that, The device includes a housing and a fan as described in any one of claims 1 to 15, wherein the housing has a receiving cavity, the fan is disposed within the receiving cavity, and the drive mechanism is fixed to the housing.

17. An air conditioner, characterized in that, It includes an indoor air conditioning unit and an outdoor air conditioning unit as described in claim 16, wherein the outdoor air conditioning unit cooperates with the indoor air conditioning unit to enable the indoor air conditioning unit to provide temperature-regulating gas.

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