A mixed flow fan and a range hood equipped with the same

Abstract

The application relates to the technical field of range hood, and provides a mixed flow fan and a range hood provided with the mixed flow fan. The mixed flow fan comprises a motor, a wind tube, a machine case and a moving blade group installed in the wind tube; the motor is installed in a cavity of the machine case and is in transmission connection with the moving blade group; the moving blade group is located at one end of the machine case close to the wind tube in the axial direction; wherein, the machine case is provided with a flow guide channel at each end in the axial direction of the wind tube, and each flow guide channel is communicated with the wind tube and the machine case. The mixed flow fan provided by the application adopts a convection mode to dissipate heat of the motor, in particular, the airflow generated by the fan can act on the motor, so that the heat dissipation demand is met.

Description

Technical Field

[0001] This application relates to the field of range hood technology, and in particular to a mixed-flow fan and a range hood equipped with the mixed-flow fan. Background Technology

[0002] Currently, in mixed-flow fans used in range hoods, the motor, which serves as the power source, generates heat during operation. To ensure the motor can operate for extended periods, effective heat dissipation is necessary to prevent damage caused by heat. However, in related technologies, the motor is typically installed inside a casing, which hinders heat dissipation. Summary of the Invention

[0003] Therefore, it is necessary to provide a mixed-flow fan that uses convection to dissipate heat from the motor, specifically by using the airflow generated by the fan to act on the motor, thereby meeting the heat dissipation requirements.

[0004] A mixed-flow fan includes a motor, a fan casing, and a housing and a moving blade assembly installed inside the fan casing; the motor is installed in the cavity of the housing and is drivenly connected to the moving blade assembly; the moving blade assembly is located at one end of the housing near the axial direction of the fan casing; wherein, both ends of the housing along the axial direction of the fan casing are provided with flow channels, and each flow channel connects the fan casing and the housing.

[0005] Understandably, this mixed-flow fan utilizes a motor to drive the rotating blade assembly to accelerate the airflow, and, combined with the arrangement of the stationary blade assembly, further alters the flow velocity. During this process, due to the relative positioning of the rotating blade assembly to the casing, the gas velocity near the rotating blade assembly end of the casing is greater than the gas velocity away from the rotating blade assembly end. Consequently, the gas pressure near the rotating blade assembly end of the casing is less than the gas pressure away from the rotating blade assembly end; that is, a pressure difference exists between the two ends of the casing along the axial direction of the fan duct. When both ends of the casing along the axial direction of the fan duct are equipped with drainage channels communicating with the cavity, the existence of this pressure difference causes convection between the drainage channels at both ends. The airflow inside the fan duct enters the cavity through the drainage channel at the higher pressure end, contacts the motor, absorbs heat, and then flows out through the drainage channel at the lower pressure end, satisfying the motor's heat dissipation requirements.

[0006] In some embodiments, the mixed-flow fan further includes a stationary blade assembly connected between the casing and the duct, and spaced apart from the moving blade assembly along the axial direction of the duct; wherein, along the axial direction of the duct, the stationary blade assembly is located at one end of the casing near the moving blade assembly.

[0007] In some embodiments, along the axial direction of the air duct, a first end of the casing is close to the moving blade assembly, a second end of the casing is far from the moving blade assembly, and the casing is configured in a first tapering structure from the first end toward the second end.

[0008] In some embodiments, each of the drainage channels includes a plurality of drainage holes, and the drainage holes are arranged at intervals and all penetrate the side wall of the casing.

[0009] In some embodiments, the axis of each of the drainage holes is parallel to or nearly parallel to the axis of the motor.

[0010] In some embodiments, the drainage hole located at the second end of the casing is used as the second drainage hole; along the axial direction of the air duct, the projection area of ​​each of the second drainage holes at least partially overlaps with the projection area of ​​the motor.

[0011] In some embodiments, along the axial direction of the air duct, the end face of the motor facing away from the moving blade assembly is used as the reference end face; the line connecting the center of the second drainage hole and the center of the reference end face forms an angle between 15 degrees and 80 degrees with the reference end face.

[0012] In some embodiments, the drain hole located at the first end of the casing is used as the first drain hole; along the axial direction of the air duct, the projection area of ​​each of the first drain holes is located on the outer periphery of the motor projection area or partially overlaps with it.

[0013] In some embodiments, the diameter of each drainage hole is between 5 mm and 10 mm; and / or, the number of drainage holes corresponding to each drainage channel is between 4 and 8.

[0014] In some embodiments, an assembly gap is provided between the moving blade assembly and the casing along the axial direction of the air duct, the assembly gap communicating between the air duct and the drainage channel.

[0015] This application also provides a range hood, including the aforementioned axial flow fan. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of an axial flow fan provided in an embodiment of this application;

[0018] Figure 2 This is a first partial schematic diagram of an axial flow fan provided in an embodiment of this application;

[0019] Figure 3 This is a second partial schematic diagram of a mixed-flow fan provided in an embodiment of this application;

[0020] Figure 4 for Figure 1 The provided right view of the mixed-flow fan;

[0021] Figure 5 for Figure 4 A magnified view of a section of AA;

[0022] Figure 6 for Figure 4 A magnified view of a portion of BB.

[0023] Reference numerals: 10, motor; 11, motor shaft; 20, air duct; 30, casing; 31, fixing part; 32, tail cone; 40, moving blade assembly; 41, rotating support part; 42, connecting ring; 43, moving blade; 50, stationary blade assembly; 51, stationary blade; 100, mixed flow fan; 101, reference end face; 301, cavity; 302, drainage channel; 1001, assembly gap; 3021, drainage hole. Detailed Implementation

[0024] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0025] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0026] Furthermore, 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 number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0029] like Figure 1 As shown, this application provides a mixed-flow fan 100 for use in a range hood. This mixed-flow fan 100 can dissipate heat from the motor 10 using convection, specifically by utilizing the airflow generated by the fan to act on the motor 10, thereby removing the heat generated by the motor 10 and meeting its heat dissipation requirements. Furthermore, the overall structure is simple, requiring no separate heat dissipation structure and minimal modification to the structure of the mixed-flow fan 100 itself. The mixed-flow fan 100 will be described in detail below.

[0030] Please see Figures 1 to 6 As shown, in some embodiments, the mixed-flow fan 100 includes a motor 10, a fan duct 20, a casing 30 installed within the fan duct 20, and a moving blade assembly 40. Specifically, the motor 10 is installed in the cavity 301 of the casing 30 and is drivenly connected to the moving blade assembly 40, which is located near one end of the casing 30 along the axial direction of the fan duct 20. Both ends of the casing 30 along the axial direction of the fan duct 20 are provided with flow channels 302, each flow channel 302 connecting the fan duct 20 and the casing 30.

[0031] Understandably, the motor 10 can drive the moving blade assembly 40 to rotate within the air duct 20 to accelerate the airflow passing through the air duct 20. Furthermore, when the accelerated airflow passes through the stationary blade assembly 50, the velocity increases further due to the change in cross-section. During this process, due to the assembly of the moving blade assembly 40 relative to the casing 30, the gas velocity at the end of the casing 30 near the moving blade assembly 40 is greater than the gas velocity at the end of the casing 30 away from the moving blade assembly 40. Therefore, the gas pressure at the end of the casing 30 near the moving blade assembly 40 is less than the gas pressure at the end of the casing 30 away from the moving blade assembly 40; that is, there is a pressure difference between the two ends of the casing 30 along the axial direction of the air duct 20. At this time, since both ends of the casing 30 along the axial direction of the air duct 20 are provided with airflow channels 302 communicating with the cavity 301, convection is formed between the airflow channels 302 at both ends. The airflow in the air duct 20 enters the cavity 301 through the airflow channel 302 corresponding to the high-pressure end, contacts the motor 10 and absorbs heat, and then flows out through the airflow channel 302 corresponding to the low-pressure end, thus meeting the heat dissipation requirements of the motor 10. In addition, the motor 10 is installed inside the casing 30 because if the motor 10 is exposed to the airflow of the air duct 20, it will affect the performance of the motor 10; therefore, this arrangement ensures that the airflow does not affect the performance of the motor 10, while also utilizing convection to dissipate heat from the motor 10.

[0032] Therefore, the axial flow fan utilizes the pressure difference between the two ends of the casing 30 along the axial direction of the air duct 20, and the corresponding flow channel 302, to promote convection at both ends of the casing 30, so as to use the airflow in the air duct 20 for heat dissipation of the motor 10; and ensures the working performance of the motor 10, without the need to assemble additional structures for heat dissipation, which not only makes the structure simple but also easy to manufacture.

[0033] Please see Figures 2 to 5 As shown, for example, each drainage channel 302 includes multiple drainage holes 3021, and the drainage holes 3021 are arranged at intervals and all penetrate the side wall of the casing 30. That is, the arrangement of multiple drainage holes 3021 forms a drainage channel 302 for gas flow, which satisfies the gas flow at both ends of the casing 30 when a pressure difference exists; and, due to the arrangement of drainage holes 3021, when gas passes through each drainage hole 3021, the corresponding flow area becomes smaller, thereby increasing the gas flow rate and improving the heat dissipation circulation efficiency. Among them, the multiple drainage holes 3021 are evenly distributed around the axis of the casing 30 to ensure uniform gas distribution, so that airflow is evenly distributed upward around the motor for heat dissipation.

[0034] In actual use, the axes of each drainage hole 3021 are parallel or nearly parallel to the axis of the motor 10. This allows the gas to flow along the axial direction of the motor 10 after entering the cavity 301, thus mitigating the heat generated during motor operation. Furthermore, this arrangement reduces the component force of the gas flowing in other directions within the cavity 301, thereby reducing flow energy consumption, ensuring gas flow rate, and improving heat dissipation circulation efficiency.

[0035] Furthermore, the casing 30 and the motor 10 are coaxially arranged. Taking the multiple drainage holes 3021 at one end of the casing 30 along the axial direction of the air duct 20 as an example, the multiple drainage holes 3021 are arranged at intervals around the axis of the casing 30 on the same circumference, so that the airflow flows into the motor 10 at the same position, thereby satisfying the uniform distribution of airflow along the circumference of the motor 10. In an alternative embodiment, the multiple drainage holes 3021 are arranged at intervals around the axis of the casing 30 on at least two circumferences, and the drainage holes 3021 on any two adjacent circumferences are staggered. On the one hand, such an arrangement can increase the number of openings, thereby increasing the airflow, so as to remove more heat and improve the heat dissipation efficiency; on the other hand, such an arrangement can disperse the opening stress on the basis of the same number of openings, ensuring the structural strength, so that the casing 30 can maintain high stability when subjected to airflow pressure in the air duct 20, thereby ensuring the stable installation of the motor 10.

[0036] In an alternative embodiment, the casing 30 may have multiple spaced-apart hollow columnar structures, each with one end extending out of the casing 30 and the other end extending toward the motor 10. In this way, airflow can flow along the hollow areas of each hollow columnar structure to the motor 10 for heat dissipation. This is sufficient as long as the pressure difference between the two ends of the casing 30 is utilized to create convection within the casing 30, and the airflow within the fan duct 20 is used for heat dissipation of the motor 10.

[0037] In practical use, when the casing 30 is provided with multiple airflow holes 3021, the end of the casing 30 closest to the moving blade assembly 40 along the axial direction of the air duct 20 is designated as the first end, and the end furthest from the moving blade assembly 40 is designated as the second end. The number of airflow holes 3021 at the first and second ends of the casing 30 can be the same or different. When the number is the same, it ensures that the airflow at both ends of the casing 30 along the axial direction is basically the same, thereby improving circulation efficiency. When the number is different, taking the example of the first end having fewer holes than the second end, a large amount of airflow is introduced from the second end to ensure sufficient contact with the motor 10, improving heat dissipation efficiency. Simultaneously, the multiple airflow holes 3021 at the first end can be evenly spaced on the same circumference, while the multiple airflow holes 3021 at the second end can be spaced apart on two circumferences. This is merely an example.

[0038] Furthermore, the diameter of each drainage hole 3021 is between 5mm and 10mm. This arrangement ensures that each drainage hole 3021 has sufficient flow area to introduce a larger amount of gas. Simultaneously, the number of drainage holes 3021 at each of the first and second ends of the casing 30 is 4-8. When the diameter of each drainage hole 3021 is larger, a smaller number can be used; when the diameter of each drainage hole 3021 is smaller, a larger number can be used. This is sufficient to allow for heat dissipation of the motor 10 through convection. For example, 4, 6, or 8 drainage holes 3021 can be provided at both the first and second ends. In actual use, if the motor is exposed to the airflow of the fan duct, it may damage the motor's performance, so the casing needs to protect the motor. At this time, using...

[0039] Please combine Figure 5 and Figure 6 As shown, in an optional embodiment, the mixed-flow fan 100 further includes a stationary blade assembly 50, which is connected between the casing 30 and the air duct 20, and is spaced apart from the moving blade assembly 40 along the axial direction of the air duct 20. The stationary blade assembly 50 is positioned at the end of the casing 30 closest to the moving blade assembly 40 along the axial direction of the air duct 20. This arrangement allows the airflow passing through the moving blade assembly 40 to be accelerated again via the stationary blade assembly 50 as quickly as possible, reducing the power consumption of the gas flow between the moving blade assembly 40 and the stationary blade assembly 50, and improving the airflow acceleration effect. Simultaneously, this arrangement further ensures that the gas pressure at the end of the casing 30 closest to the moving blade assembly 40 is significantly greater than the gas pressure at the end furthest from the moving blade assembly 40, creating a significant pressure difference between the two ends of the casing 30. This allows for continuous convection within the casing 30, satisfying the continuous heat dissipation requirements of the motor 10.

[0040] Furthermore, the motor 10, casing 30, stationary blade assembly 50, moving blade assembly 40, and air duct 20 are all coaxially arranged. In this configuration, the distance between the stationary blade assembly 50 and the first end of the casing 30 accounts for 10%-30% of the length of the casing 30. This arrangement reduces installation and rotational interference between the stationary blade assembly 50 and the moving blade assembly 40, while ensuring that the distance between them is not too large, thus reducing airflow energy loss. Additionally, it allows for a significant pressure difference between the two ends of the casing 30, ensuring continuous convection and improving heat dissipation.

[0041] Please continue to combine Figure 5 and Figure 6As one example, along the axis of the air duct 20, the casing 30 is configured with a first tapering structure from the first end toward the second end. On the one hand, this configuration allows the portion of the casing 30 used to support the stationary blade assembly 50 to have a larger diameter, thereby reducing the radial length of the stationary blade assembly 50 along the air duct 20, improving the structural strength of the stationary blade assembly 50, and ensuring that the casing 30 has a larger assembly space for the installation of the motor 10. On the other hand, this configuration, for the casing 30, causes the space for airflow to gradually increase from the first end to the second end, and the gas pressure inside the air duct 20 to gradually increase. The pressure at the second end can be kept as high as possible to meet the pressure difference requirement between the first and second ends, facilitating smoother airflow into the cavity 301 of the casing 30 at the second end for heat dissipation of the motor 10. At the same time, this configuration makes the casing 30 streamlined, reducing the flow resistance to the gas inside the air duct 20 and facilitating gas flow within the air duct 20.

[0042] When the motor 10 is installed in the cavity 301 of the casing 30, the drainage holes 3021 at the first and second ends are located at both ends of the motor 10 along its own axial direction. This ensures that the airflow can flow along the axial direction of the motor 10 after entering the cavity 301, thereby carrying away the heat generated by the motor 10 and improving heat dissipation efficiency. Moreover, along the motor axis 11, the projected area of ​​the drainage hole 3021 at the second end at least partially overlaps with the projected area of ​​the motor 10, so that the airflow can penetrate as much as possible into the interior of the motor 10, increasing the contact area with the motor 10, and even contacting the heat-generating center area as much as possible, thus enhancing the heat dissipation effect. At the same time, along the motor axis 11, the projected area of ​​the drainage hole 3021 at the first end (i.e., the first drainage hole) does not overlap with the projected area of ​​the motor 10, or only partially overlaps. When in a non-overlapping state, the projected area of ​​the drainage hole 3021 surrounds the outside of the projected area of ​​the motor 10. On the one hand, this arrangement ensures a large radial distance between each drainage hole 3021 at the first end and the motor shaft 11, reducing the impact of opening stress and facilitating the assembly of the motor 10 and the casing 30. On the other hand, this arrangement allows the drainage holes 3021 at the first end to fully correspond to the parts of the casing 30 cavity 301 that do not overlap with the motor 10, reducing flow obstruction and facilitating airflow. Furthermore, this arrangement is compatible with the heat dissipation path of the motor 10 itself.

[0043] In some specific embodiments, along the motor shaft 11, the projection area of ​​the drainage hole 3021 (i.e., the second drainage hole) located at the second end falls within the projection area of ​​the motor 10, that is, the two completely overlap.

[0044] Furthermore, the first end face of the casing 30 is planar, and the second end is conical. In this case, the motor shaft 11 of the motor 10 extends from the first end face to connect with the moving blade assembly 40, satisfying the driving requirements of the moving blade assembly 40. Multiple drainage holes 3021 at the first end are arranged through the axis of the casing 30 and surround the outer periphery of the motor shaft 11. Multiple drainage holes 3021 at the second end are arranged through the axial direction of the casing 30, so that the axial direction of each drainage hole 3021 is substantially the same as the axial direction of the air duct 20; this facilitates smooth airflow into the drainage holes 3021, reduces the force component in other directions, and thus reduces wind energy loss. In some specific embodiments, the second end of the casing 30 is provided with four drainage holes 3021, which are distributed on two circumferences spaced apart along the axial direction of the air duct 20, with two drainage holes 3021 on each circumference arranged radially opposite to each other on the casing 30. The first end of the casing 30 is provided with six drainage holes 3021, located on the same circumference. Of course, it is also possible that the second end has five drainage holes 3021 and the first end has five drainage holes 3021. This is only an example for illustration.

[0045] like Figure 5 As shown, further along the axial direction of the air duct 20, with the end face of the motor 10 facing the second end as the reference end face 101, the angle C between the line connecting the center of the second drainage hole and the center of the reference end face 101 (hereinafter referred to as the first connecting line H for ease of description) and the reference end face 101 is between 15 degrees and 80 degrees.

[0046] After the motor 10 is installed in the housing 30, the position of the reference end face 101 of the motor 10 is determined. At this time, in order to meet the heat dissipation requirements of the motor 10, the position of the drainage hole 3021 located at the second end of the housing 30 can be adjusted so that it can be located as close as possible to the projection area of ​​the reference end face 101, or partially overlap with the projection area of ​​the reference end face 101. In practical use, when the angle between the first connecting line H and the reference end face 101 is too small, the range of the drainage hole 3021 will exceed the range corresponding to the reference end face 101, which may reduce the contact area between the airflow and the motor 10. When the angle between the first connecting line H and the reference end face 101 is too large, on the one hand, it will extend the length between the drainage holes 3021 at both ends of the casing 30 axially, which is equivalent to extending the flow path of the airflow in the casing 30. Although this can increase the contact time between the airflow and the motor 10, it will be inconvenient for the airflow to flow out in time. On the other hand, an excessively large angle will cause the drainage holes 3021 at the second end to concentrate at the sharp corner of the conical surface, which will easily weaken the structural strength of the second end, thereby affecting the installation stability of the motor 10. In addition, due to the tapered design of the casing 30, it also has a flow-expanding effect on the gas flow. Therefore, the closer to the second end of the casing 30, the weaker the gas pressure will be. Therefore, the aforementioned angle should not be too large.

[0047] In some specific embodiments, the angle between the first connecting line H and the reference end face 101 is 15 degrees, 45 degrees, 65 degrees, 73 degrees or 80 degrees.

[0048] Please continue reading. Figure 5 and Figure 6 In some embodiments, the housing 30 includes a fixing part 31 and a tail cone part 32 connected to one end of the fixing part 31. The other end of the fixing part 31 faces the moving blade assembly 40, and the stationary blade assembly 50 is connected between the fixing part 31 and the air duct 20. The fixing part 31 and the tail cone part 32 together form a cavity 301 for mounting the motor 10, and both are provided with drainage holes 3021. Specifically, the end of the fixing part 31 facing the tail cone part 32 is open to facilitate the installation of the motor 10 into the housing 30; the tail cone part 32 is connected to the open part of the fixing part 31 to encapsulate the motor 10 in the housing 30. At this time, since both the fixing part 31 and the tail cone part 32 are provided with drainage holes 3021, the convective heat dissipation of the motor 10 is satisfied.

[0049] The end of the fixing part 31 facing the moving blade assembly 40 serves as the first end of the casing 30 and is equipped with a mounting hole for the motor shaft 11 to extend out. At this time, a plurality of drainage holes 3021 on the fixing part 31 are arranged at intervals around the axis of the mounting hole and are located outside the mounting hole. The end of the tail cone 32 facing away from the fixing part 31 is located at the second end of the casing 30.

[0050] Furthermore, the length of the fixing part 31 along the axial direction of the air duct 20 is basically the same as the axial length of the motor 10, so that the reference end face 101 of the motor 10 and the end face of the tail cone 32 can be basically flush, which makes it easy to design multiple drainage holes 3021 on the tail cone 32.

[0051] Furthermore, from the first end of the housing 30 toward the second end, the diameter of the fixing part 31 gradually decreases to form a tapered structure that adapts to the tail cone part 32. The minimum diameter of the fixing part 31 is basically the same as the maximum diameter of the tail cone part 32. This arrangement not only makes the housing 30, composed of the fixing part 31 and the tail cone part 32, a single tapered structure, but also allows for a smooth transition between the fixing part 31 and the tail cone part 32 to meet the requirements of a streamlined design.

[0052] In practical use, the tail cone 32 and the fixing part 31 are detachably connected, facilitating the assembly and disassembly of the motor 10. Specifically, the fixing part 31 has a mounting platform protruding from the open edge along the direction close to the axis, and the tail cone 32 is threadedly connected to the mounting platform using screws passing through it. In alternative embodiments, the tail cone 32 and the fixing part 31 can also be glued, snap-fitted, or interference-fitted.

[0053] like Figures 2 to 6As shown, in an optional embodiment, the stationary blade assembly 50 includes a plurality of stationary blades 51, each stationary blade 51 being arranged at intervals around the axis of the housing 30 and connected between the housing 30 and the air duct 20. It is understood that by using the arrangement of the plurality of stationary blades 51, the space between the housing 30 and the air duct 20 is divided into a plurality of spaced ventilation channels, thereby changing the cross-section used for airflow. The stationary blades 51, the fixing portion 31 of the housing 30, and the air duct 20 can be integrally formed.

[0054] like Figure 5 and Figure 6 As shown, the moving blade assembly 40 further includes a rotating support 41, a connecting ring 42, and multiple moving blades 43. The connecting ring 42 surrounds the outer periphery of the rotating support 41. Each moving blade 43 is arranged at intervals around the axis of the rotating support 41 and is connected between the rotating support 41 and the connecting ring 42. The rotating support 41 is driven by the motor 10 and the motor shaft 11 of the motor 10. An assembly gap 1001 is constructed between the rotating support 41 and the casing 30, and the assembly gap 1001 connects the air duct 20 and the flow channel 302.

[0055] Specifically, the rotating support 41 and connecting ring 42 are designed to integrate and assemble multiple moving blades 43 as a whole relative to the motor 10, thereby improving the structural strength of the entire moving blade assembly 40. Simultaneously, the assembly gap 1001 serves two purposes: firstly, it prevents the rotating support 41 from contacting the housing 30, reducing the impact on the rotation of the moving blades 43 and minimizing wear between the rotating support 41 and the housing 30; secondly, it allows for the flow of gas through the housing 30, meaning that the airflow entering the cavity 301 from the second end flows out to the assembly gap 1001 from the first end, merging with the gas inside the air duct 20 to continue flowing. During assembly, a groove is provided on the air duct 20 at the position corresponding to the connecting ring 42, and a portion of the connecting ring 42 is accommodated within the groove. Furthermore, the end of the rotating support 41 facing away from the housing 30 is separately designed to allow for assembly between the rotating support 41 and the motor shaft 11; the portion connecting the rotating support 41 to the moving blades 43, the moving blades 43, and the connecting ring 42 can be integrally formed.

[0056] Along the axial direction of the air duct 20, the rotating support portion 41 is arranged in a second tapering structure from the stationary blade assembly 50 toward the moving blade assembly 40. This allows the rotating support portion 41 and the casing 30 to form a compatible streamlined structure, reducing airflow resistance. Furthermore, along the axial direction of the air duct 20, the length of the rotating support portion 41 is less than the length of the casing 30, and the apex angle of the second tapering structure is greater than the apex angle of the first tapering structure. It should be noted that both the second tapering structure and the first tapering structure can be conical.

[0057] It should be added that the assembly method of the moving blade assembly 40 and the motor shaft 11 is a mature existing technology, so it will not be described in detail here.

[0058] In an optional embodiment, the duct 20 can be configured with a variable diameter to change the flow cross-section during airflow, thereby altering the gas velocity. Specifically, the portion of the duct 20 near the moving blade assembly 40 can have its diameter reduced accordingly to increase the flow velocity towards the moving blade assembly 40, which is then further accelerated after passing through the moving blade assembly 40 and the stationary blade assembly 50. Furthermore, the diameter of the duct 20 between the moving blade assembly 40 and the stationary blade assembly 50 can be slightly increased to ensure sufficient space between the casing 30 and the duct 20 for airflow. Then, the diameter decreases again from the stationary blade assembly 50 toward the direction away from the moving blade assembly 40 to further increase the gas velocity.

[0059] The air duct 20 can be split along its own axis for easy assembly. Specifically, the part of the air duct 20 that connects to the stationary blade assembly 50, and the part that surrounds the moving blade assembly 40, are split and then fitted together using bolts or snap-fits.

[0060] like Figure 1 , Figure 5 and Figure 6 As shown, another embodiment of this application provides a range hood, including a wind box and the aforementioned axial flow fan. The axial flow fan is installed inside the wind box, and its operation draws indoor fumes to the outside. During the fume extraction process, since the casing 30 supporting the motor 10 is provided with flow channels 302 at both ends along the axial direction of the air duct 20, a pressure difference is formed at both ends of the casing 30, thereby promoting convection inside the casing 30 for heat dissipation of the motor 10.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A mixed-flow fan, characterized in that, The mixed-flow fan (100) includes a motor (10), a fan casing (20), and a casing (30) and a moving blade assembly (40) installed in the fan casing (20). The motor (10) is installed in the cavity (301) of the casing (30) and is connected to the moving blade assembly (40) for transmission; the moving blade assembly (40) is located at one end of the casing (30) along the axial direction of the air duct (20); The casing (30) is provided with a flow channel (302) at both ends along the axial direction of the air duct (20), and each flow channel (302) is connected to the air duct (20) and the casing (30). The mixed-flow fan also includes a stationary blade assembly (50), which is connected between the casing (30) and the air duct (20) and is arranged at intervals from the moving blade assembly (40) along the axial direction of the air duct (20); wherein, along the axial direction of the air duct (20), the stationary blade assembly (50) is located at one end of the casing (30) near the moving blade assembly (40). Along the axial direction of the air duct (20), the first end of the casing (30) is close to the moving blade assembly (40), and the second end of the casing (30) is far away from the moving blade assembly (40). The casing (30) is configured with a first tapering structure from the first end toward the second end.

2. The mixed-flow fan according to claim 1, characterized in that, Each of the drainage channels (302) includes multiple drainage holes (3021), and the drainage holes (3021) are arranged at intervals and all penetrate the side wall of the casing (30).

3. The mixed-flow fan according to claim 2, characterized in that, The axis of each of the drainage holes (3021) is parallel or nearly parallel to the axis of the motor (10).

4. The mixed-flow fan according to claim 2, characterized in that, The drainage hole (3021) located at the second end of the casing (30) is used as the second drainage hole; Along the axial direction of the air duct (20), the projection area of ​​each of the second drainage holes at least partially overlaps with the projection area of ​​the motor (10).

5. The mixed-flow fan according to claim 4, characterized in that, Along the axial direction of the air duct (20), the end face of the motor (10) facing away from the moving blade assembly (40) is taken as the reference end face (101). The line connecting the center of the second drainage hole and the center of the reference end face (101) forms an angle between 15 degrees and 80 degrees with the reference end face (101).

6. The mixed-flow fan according to claim 4, characterized in that, The drainage hole (3021) located at the first end of the casing (30) is used as the first drainage hole; Along the axial direction of the air duct (20), the projection area of ​​each of the first drainage holes is located on the outer periphery of the projection area of ​​the motor (10) or partially overlaps with it.

7. The mixed-flow fan according to claim 2, characterized in that, The diameter of each of the drainage holes (3021) is between 5 mm and 10 mm; and / or, the number of drainage holes (3021) corresponding to each drainage channel (302) is between 4 and 8.

8. The mixed-flow fan according to claim 1, characterized in that, Along the axial direction of the air duct (20), an assembly gap (1001) is constructed between the moving blade assembly (40) and the casing (30), and the assembly gap (1001) connects the air duct (20) and the drainage channel (302).

9. A range hood, characterized in that, The range hood includes the mixed-flow fan as described in any one of claims 1 to 8.

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