Centrifugal axial flow fan, guide vane design method thereof, intelligent electric appliance, equipment and medium

Abstract

The invention provides a centrifugal axial flow fan, a guide vane design method of the centrifugal axial flow fan, an intelligent electric appliance, equipment and a medium, and the method comprises the steps that the airflow speed of airflow in multiple dimensions is determined for each partition on a guide vane; wherein the airflow velocities in the multiple dimensions meet airflow constraint, and the multiple dimensions at least comprise a radial dimension, an axial dimension and a circumferential dimension; determining a curved surface parameter of each partition according to a curved surface design criterion and the multi-dimensional airflow velocity; determining a molded line parameter of each partition according to a molded line design criterion and the multi-dimensional airflow velocity; and determining a design result of the guide vane by combining the curved surface parameter and the molded line parameter of each partition. The axial dimension, the circumferential dimension and the radial dimension of the air flow are combined, the target position where the air flow synchronously reaches the guide vane is used as a constraint, flow separation of the air flow component of any dimension in the guide vane is avoided, the total pressure and static pressure efficiency of the fan is effectively improved, and energy consumption is reduced.

Description

[0001] This application claims priority to Chinese patent application CN2026100280429, filed on January 9, 2026. The entire contents of the aforementioned Chinese patent application are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of household appliance technology, and in particular to a centrifugal axial flow fan and its guide vane design method, intelligent appliances, equipment and media. Background Technology

[0003] Centrifugal and axial flow fans are pneumatic devices that combine the characteristics of centrifugal and axial flow fans. They are commonly used in various exhaust systems such as ventilation, air conditioning, cooling towers, and industrial exhaust. They can generate a relatively large air volume in a small space and also provide a certain amount of air pressure, which allows for their wide application.

[0004] The working principle of a centrifugal axial flow fan: Under the action of the fan impeller, the airflow enters the fan from the inlet and enters the diffuser chamber from the air inlet of the centrifugal axial flow fan. Under the action of the guide vanes in the diffuser chamber, the airflow pressure is converted into static pressure and finally discharged axially from the outlet of the centrifugal axial flow fan.

[0005] However, the current design of the guide vanes inside centrifugal fans has flaws, resulting in significant aerodynamic noise in centrifugal axial flow fans. Summary of the Invention

[0006] The technical problem to be solved by this disclosure is to overcome the defects in the guide vane design inside the centrifugal fan in the prior art, and to provide a centrifugal axial flow fan and its guide vane design method, intelligent electrical appliances, equipment and media.

[0007] This disclosure solves the above-mentioned technical problems through the following technical solution:

[0008] In a first aspect, this disclosure provides a guide vane design method for a centrifugal axial flow fan, wherein the guide vane is disposed within the diffuser chamber of the centrifugal axial flow fan, and airflow enters the diffuser chamber from the air inlet of the centrifugal axial flow fan. The method includes:

[0009] For each section on the guide vane, the airflow velocity in multiple dimensions is determined; wherein the airflow velocity in multiple dimensions satisfies airflow constraints, and the multiple dimensions include at least radial dimension, axial dimension and circumferential dimension, and the airflow constraints include that the airflow takes the same amount of time to reach the target position in each dimension;

[0010] Based on the surface design criteria and the airflow velocities in the multiple dimensions, the surface parameters of each partition are determined;

[0011] Based on the profile design criteria and the airflow velocities in the multiple dimensions, the profile parameters for each zone are determined;

[0012] The design result of the guide vane is determined by combining the surface parameters and profile parameters of each partition.

[0013] Optionally, the airflow constraint includes:

[0014] ;

[0015] ;

[0016] in, Displacement in the radial dimension The radius of the target location. The radius of the air inlet. The airflow velocity in the radial dimension, The displacement in the circumferential dimension. The airflow velocity in the circumferential dimension. The displacement is in the axial dimension. The airflow velocity in the axial dimension. Duration.

[0017] Optionally, the radial airflow velocity includes:

[0018] ;

[0019] in, The airflow velocity in the radial dimension is... Let r be the airflow rate, and r be the radius of the air inlet. Let b be the radius of the incoming airflow, and b be the width of the air inlet;

[0020] Optionally, the airflow velocity in the axial dimension includes:

[0021] ;

[0022] in, The airflow velocity is defined as the axial dimension. The displacement is in the axial dimension. The airflow velocity in the radial dimension, The radius of the target location. The radius of the air inlet;

[0023] Optionally, the airflow velocity in the circumferential dimension includes:

[0024] ;

[0025] in, The airflow velocity in the circumferential dimension is... Let be the rotational angular velocity of the impeller of the centrifugal axial flow fan. The radius of the incoming airflow is denoted as . The slip coefficient, The radius of each partition near the hub. The radius of each partition near the wind shield.

[0026] Optionally, the surface parameters include axial distance;

[0027] The surface design criteria include the axial distance criterion:

[0028] ;

[0029] in, Let i be the axial distance of partition i. The airflow velocity is defined as the axial dimension. The airflow velocity in the radial dimension is... The radius of the target location. The radius of the air inlet;

[0030] Optionally, the surface parameters include circumferential deflection angle;

[0031] The surface design criteria include the circumferential deflection angle criterion:

[0032] ;

[0033] in, Let i be the circumferential deflection angle of partition i. Let be the rotational angular velocity of the impeller of the centrifugal axial flow fan. The airflow velocity in the radial dimension is... The radius of the target location. The radius of the air inlet.

[0034] Optionally, the profile parameters include the radius of curvature;

[0035] The profile design criteria include the radius of curvature design criteria:

[0036] ;

[0037] in, Let be the radius of curvature of partition i. Based on the radius of curvature, The maximum airflow velocity in the circumferential dimension. The airflow velocity is defined as the circumferential dimension, and k is a preset parameter.

[0038] Optionally, the profile parameters include the angle of attack;

[0039] The profile design criteria include the angle of attack design criteria:

[0040] ;

[0041] in, Let i be the angle of attack for partition i. The airflow velocity in the radial dimension is... The airflow velocity in the circumferential dimension is... For angle of attack compensation.

[0042] In a second aspect, this disclosure provides a centrifugal axial flow fan, wherein the guide vanes of the centrifugal axial flow fan are designed according to the guide vane design method of the centrifugal axial flow fan as described in any one of the first aspects.

[0043] Thirdly, this disclosure provides a smart appliance, which includes the centrifugal axial flow fan as described in the second aspect.

[0044] Optionally, the smart appliance further includes a controller and a voice receiving module;

[0045] The controller is electrically connected to the centrifugal axial flow fan and the voice receiving module respectively. The controller is used to send control commands to the centrifugal axial flow fan according to the user commands received by the voice receiving module. The control commands adjust the airflow speed of the centrifugal axial flow fan.

[0046] Fourthly, this disclosure provides an electronic device comprising a processor and a memory, wherein the memory stores at least one instruction or at least one program, the at least one instruction or at least one program being loaded and executed by the processor to implement the guide vane design method for a centrifugal axial flow fan as described in any of the first aspects.

[0047] Fifthly, this disclosure provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the guide vane design method for a centrifugal axial flow fan as described in any one of the first aspects.

[0048] The positive and progressive effects of this disclosure are as follows: by combining the axial, circumferential, and radial dimensions of the airflow, the influence of airflow in each dimension is fully considered in the guide vane design process. With the synchronous arrival of airflow at the target position of the guide vane as a constraint, flow separation of any airflow component in the guide vane is avoided, thereby avoiding energy loss and airflow disturbance. This effectively improves the total pressure and static pressure efficiency of the fan and reduces energy consumption. It can also effectively reduce broadband aerodynamic noise and shift the peak frequency to a non-sensitive area. Attached Figure Description

[0049] Figure 1 A first flowchart illustrating a guide vane design method for a centrifugal axial flow fan provided as an exemplary embodiment of this disclosure;

[0050] Figure 2 A schematic diagram of the internal structure of a centrifugal axial flow fan provided as an exemplary embodiment of this disclosure;

[0051] Figure 3 A schematic diagram of airflow movement on guide vanes provided as an exemplary embodiment of this disclosure;

[0052] Figure 4 A front view of a centrifugal axial flow fan provided as an exemplary embodiment of this disclosure;

[0053] Figure 5 A partial schematic diagram of a centrifugal axial flow fan provided for an exemplary embodiment of this disclosure;

[0054] Figure 6 A schematic diagram of a module of a smart appliance provided for an exemplary embodiment of this disclosure;

[0055] Figure 7 This is a schematic diagram of the structure of an electronic device provided as an exemplary embodiment of the present disclosure. Detailed Implementation

[0056] The present disclosure is further illustrated below by way of embodiments, but the present disclosure is not limited to the scope of the embodiments described herein.

[0057] An exemplary embodiment of this disclosure provides a guide vane design method for a centrifugal axial flow fan, wherein the guide vane is disposed in the diffuser chamber of the centrifugal axial flow fan, and airflow enters the diffuser chamber from the air inlet of the centrifugal axial flow fan.

[0058] See details Figure 1 The method includes:

[0059] S101. For each section on the guide vane, determine the airflow velocity in multiple dimensions.

[0060] Among them, the guide vane is the stationary guide vane in the axial flow fan, for example... Figure 2 The first-stage guide vane 23 shown in this embodiment can be partitioned according to any one of the radial, axial and circumferential dimensions. The size of the partition can be set according to the precision requirements of the actual guide vane design. In this embodiment, it is not particularly limited.

[0061] Specifically, the airflow velocities in the multiple dimensions satisfy airflow constraints, and these multiple dimensions include at least radial, axial, and circumferential dimensions. The radial dimension refers to the direction from the center of rotation to the outer edge; the axial dimension refers to the direction along the rotation axis; and the circumferential dimension refers to the direction around the rotation axis, also known as the tangential dimension.

[0062] The following section explains airflow constraints; see [link / reference]. Figure 3 After the airflow enters the diffuser chamber from the inlet of the centrifugal axial flow fan, it specifically enters the guide vane from the position near the impeller 22 at the trailing edge and exits from the leading edge. Ideally, the target position should be the position near the outer wall of the air duct at the leading edge of the guide vane in each section. However, due to the following reasons, the velocity of the impeller 22 gradually decreases from the top plate 221 to the bottom plate 222, while the vertical distance between the top plate 221 and the guide vane is large and the distance between the bottom plate 222 and the guide vane is small. This results in a large spiral span of the airflow near the top plate 221 and a small span of the airflow near the bottom plate 222 during the process of the airflow entering the guide vane from the impeller 22. As a result, when the airflow reaches the leading edge of the guide vane under the guidance of the guide vane, there are usually three situations:

[0063] 1. When the airflow reaches position C1 (i.e., during spiral flow), the radial displacement of the airflow diffuses to the outer wall of the duct, but the axial displacement does not reach the leading edge of the guide vane. 2. When the airflow reaches position C1 (i.e., during spiral flow), the radial displacement of the airflow diffuses to the outer wall of the duct, and simultaneously the axial displacement reaches the leading edge of the guide vane. 3. When the airflow reaches position C3 (i.e., during spiral flow), the axial displacement of the airflow reaches the leading edge of the guide vane, but the radial displacement does not diffuse to the outer wall of the duct.

[0064] Of these three scenarios, the first scenario generates secondary vortices when the airflow impacts the outer wall of the duct, affecting fan efficiency and noise. The third scenario results in a decrease in airflow velocity in the radial dimension and an increase in airflow velocity in the axial dimension, leading to airflow loss. Furthermore, the airflow shifts inward towards the duct, increasing the airflow velocity within the duct and consequently increasing aerodynamic noise. The second scenario is optimal in terms of both fan efficiency and aerodynamic noise.

[0065] Based on the second scenario, the airflow constraint in this embodiment includes ensuring that the airflow takes the same amount of time to reach the target location in each dimension.

[0066] In one embodiment, the airflow constraint includes:

[0067] (1)

[0068] (2)

[0069] in, Displacement in the radial dimension The radius of the target location. The radius of the air inlet. The airflow velocity in the radial dimension, The displacement in the circumferential dimension. The airflow velocity in the circumferential dimension. The displacement is in the axial dimension. The airflow velocity in the axial dimension. Duration.

[0070] Specifically, the radial airflow velocity includes:

[0071] (3)

[0072] in, The airflow velocity in the radial dimension is... Let r be the airflow rate, and r be the radius of the air inlet. Let be the radius of the incoming airflow, and b be the width of the air inlet.

[0073] The airflow velocity in the circumferential dimension includes:

[0074] (4)

[0075] in, The airflow velocity in the circumferential dimension is... The rotational angular velocity of the impeller 22 of the centrifugal axial flow fan is given. Let be the radius of the incoming airflow. The slip coefficient, The radius of each partition near the hub (i.e., the wind turbine body 26) is given. The radius of each partition near the wind shield.

[0076] The airflow velocity in the axial dimension includes:

[0077] (5)

[0078] in, The airflow velocity is defined as the axial dimension. The displacement is in the axial dimension. The airflow velocity in the radial dimension, The radius of the target location. The radius of the air inlet.

[0079] S102. Determine the surface parameters of each partition based on the surface design criteria and the airflow velocities of the multiple dimensions.

[0080] The surface of each partition can typically be a NURBS surface (Non-Uniform Rational B-Spline Surface). NURBS surfaces are one of the most commonly used types of surfaces in Computer Aided Design, CAD, and computer graphics. The surface parameters can be input into CAD software to obtain the surface design of the corresponding partition.

[0081] In one embodiment, the surface parameters include axial distance, and the surface design criteria include axial distance criteria:

[0082] (6)

[0083] in, Let i be the axial distance of partition i. The airflow velocity is defined as the axial dimension. The airflow velocity in the radial dimension is... The radius of the target location. The radius of the air inlet.

[0084] Specifically, the axial distance criterion can be equivalent to the displacement in the axial dimension. The axial distance criterion is derived from the formula (1) of the airflow constraint and the formula (5) of the airflow velocity in the axial dimension.

[0085] In one embodiment, the surface parameters include a circumferential deflection angle, and the surface design criteria include a circumferential deflection angle criterion:

[0086] (7)

[0087] in, Let i be the circumferential deflection angle of partition i. The rotational angular velocity of the impeller 22 of the centrifugal axial flow fan (which can be obtained through measurement). The airflow velocity in the radial dimension is... The radius of the target location. The radius of the air inlet.

[0088] Specifically, the circumferential deflection angle can be equivalent to the axial displacement variable. The circumferential deflection angle criterion is derived from the formula (1) of the airflow constraint and the formula (4) of the airflow velocity in the circumferential dimension.

[0089] S103. Determine the profile parameters for each zone based on the profile design criteria and the airflow velocities of the multiple dimensions.

[0090] The profile design for each partition can be obtained based on the profile parameters.

[0091] In one implementation, the profile parameters include the radius of curvature, and the profile design criteria include a radius of curvature design criterion:

[0092] (8)

[0093] in, Let be the radius of curvature of partition i. Based on the radius of curvature, The maximum airflow velocity in the circumferential dimension. The airflow velocity is defined as the circumferential dimension, and k is a preset parameter, k=0.2~0.5, used to increase the radius of curvature to reduce secondary flow loss, but it is not limited to 0.2~0.5, and can be set according to the actual situation.

[0094] In one implementation, the profile parameters include the angle of attack, and the profile design criteria include the angle of attack design criteria:

[0095] (9)

[0096] in, Let i be the angle of attack for partition i. The airflow velocity in the radial dimension is... The airflow velocity in the circumferential dimension is... For angle of attack compensation, =2°~5°, used to avoid flow separation, but not limited to 2°~5°, the specific setting should be based on the actual situation.

[0097] In one embodiment, the profile parameters include density, which can be set according to actual conditions, for example, the density on the shroud side. =1.2~1.5, hub side =0.8~1.0, but not limited to the above values, and should be set according to the actual situation.

[0098] S104. Combining the surface parameters and profile parameters of each partition, determine the design result of the guide vane.

[0099] Specifically, the surface parameters and profile parameters of each section of the guide vane are integrated to obtain the design result of the guide vane.

[0100] In this embodiment, by considering the axial, circumferential, and radial dimensions of the airflow, the influence of airflow in each dimension is fully taken into account during the guide vane design process. The synchronous arrival of airflow at the target position of the guide vane is used as a constraint to avoid flow separation of any airflow component in the guide vane, thereby avoiding energy loss and airflow disturbance. This effectively improves the total pressure and static pressure efficiency of the fan and reduces energy consumption. It can also effectively reduce broadband aerodynamic noise and shift the peak frequency to a non-sensitive area.

[0101] An exemplary embodiment of this disclosure provides a centrifugal axial flow fan, see [link to example]. Figure 2 , Figure 4 and Figure 5 The guide vanes of the centrifugal axial flow fan are designed according to the guide vane design method of the centrifugal axial flow fan described in the above embodiments.

[0102] Specifically, the centrifugal axial flow fan includes a circular inlet 21, an impeller 22, a primary guide vane 23, a secondary guide vane 24, a diffuser 25, a fan body 26, a fan shroud 27, and an annular outlet 28, all of which can be designed using the guide vane design method for centrifugal axial flow fans described in the above embodiments.

[0103] A high-speed rotating centrifugal fan enters the blower axially through the inlet. The rotating airflow generated by the blades flows radially out into the diffuser chamber 25, and finally into the axial diffuser duct. Under the action of the stationary guide vanes, the airflow flows axially out. In the diffuser duct, the airflow pressure is converted into static pressure by the stationary guide vanes, the airflow velocity decreases, and finally it is discharged from the annular outlet 28.

[0104] In addition, the number of primary guide vanes 23 and secondary guide vanes 24 can be set according to actual conditions. In this embodiment, there are 11, but it is not limited to this. Generally speaking, the number of primary guide vanes 23 and secondary guide vanes 24 is coprime to the number of blades of impeller 22.

[0105] Verification has shown that the guide vanes designed in the above embodiments can effectively reduce the inlet velocity non-uniformity, total pressure efficiency, and noise in centrifugal axial flow fans.

[0106] This disclosure provides an exemplary embodiment of a smart appliance, see [link to example]. Figure 6 The smart appliance includes the centrifugal axial flow fan as described in the above embodiments. The smart appliance includes, but is not limited to, one or more of the following: air conditioner, range hood, dishwasher, and refrigerator.

[0107] In one embodiment, the smart appliance further includes a controller and a voice receiving module.

[0108] The controller is electrically connected to the centrifugal axial flow fan and the voice receiving module respectively. The controller is used to send control commands to the centrifugal axial flow fan according to the user commands received by the voice receiving module. The control commands adjust the airflow speed of the centrifugal axial flow fan.

[0109] The user command includes the airflow level, and the controller stores the airflow speed corresponding to each airflow level. The controller parses the user command to determine the airflow level and determines the control command based on the airflow speed corresponding to the airflow level.

[0110] In addition to adjusting airflow speed, the smart appliance provided in this embodiment can also perform various intelligent operations by the controller according to the actual use of the smart appliance. The controller can also load various trained models such as language models to improve the intelligence level of the smart appliance. Specific details are not particularly limited in this embodiment.

[0111] This disclosure also provides an electronic device in one example embodiment, see [link to example embodiment]. Figure 7 The electronic device includes a memory, a processor, and a computer program stored in the memory and used to run on the processor. When the processor executes the computer program, it implements the guide vane design method of the centrifugal axial flow fan described in any of the above embodiments. Figure 7 The electronic device 70 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments disclosed herein.

[0112] The electronic device may be the controller mentioned in the above embodiments, but is not limited to it.

[0113] like Figure 7 As shown, the electronic device 70 can be manifested as a general-purpose computing device, such as a server device. The components of the electronic device 70 may include, but are not limited to: at least one processor 71, at least one memory 72, and a bus 73 connecting different system components (including memory 72 and processor 71).

[0114] Bus 73 includes a data bus, an address bus, and a control bus.

[0115] The memory 72 may include volatile memory, such as random access memory (RAM) 721 and / or cache memory 722, and may further include read-only memory (ROM) 723.

[0116] The memory 72 may also include a program tool 725 (or utility) having a set (at least one) program module 724, such program module 724 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0117] The processor 71 executes various functional applications and data processing by running computer programs stored in the memory 72, such as the guide vane design method for centrifugal axial flow fans provided in any of the above embodiments.

[0118] Electronic device 70 can also communicate with one or more external devices 74 (e.g., keyboard, pointing device, etc.). This communication can be performed via input / output (I / O) interface 75. Furthermore, electronic device 70 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public network, such as the Internet) via network adapter 76. As shown, network adapter 76 communicates with other modules of electronic device 70 via bus 73. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with electronic device 70, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, and data backup storage systems.

[0119] It should be noted that although several units / modules or sub-units / modules of the electronic device have been mentioned in the detailed description above, this division is merely exemplary and not mandatory. In fact, according to embodiments of this disclosure, the features and functions of two or more units / modules described above can be embodied in one unit / module. Conversely, the features and functions of one unit / module described above can be further divided and embodied by multiple units / modules.

[0120] An exemplary embodiment of this disclosure also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the guide vane design method for a centrifugal axial flow fan provided in any of the above embodiments.

[0121] The readable storage medium may be more specifically adopted, including but not limited to: portable disk, hard disk, random access memory, read-only memory, erasable programmable read-only memory, optical storage device, magnetic storage device, or any suitable combination thereof.

[0122] An exemplary embodiment of this disclosure also provides a computer program product, including a computer program that, when executed by a processor, implements the guide vane design method for any of the preceding claims for a centrifugal axial flow fan.

[0123] The program code for executing the computer program product of this disclosure can be written in any combination of one or more programming languages, and the program code can be executed entirely on a user device, partially on a user device, as a stand-alone software package, partially on a user device and partially on a remote device, or entirely on a remote device.

[0124] While specific embodiments of this disclosure have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this disclosure is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this disclosure, but all such changes and modifications fall within the scope of protection of this disclosure.

Claims

1. A method for designing guide vanes for a centrifugal axial flow fan, characterized in that, The guide vanes are disposed within the diffuser chamber of the centrifugal axial flow fan, and the airflow enters the diffuser chamber from the air inlet of the centrifugal axial flow fan. The method includes: For each section on the guide vane, the airflow velocity in multiple dimensions is determined; wherein the airflow velocity in multiple dimensions satisfies airflow constraints, and the multiple dimensions include at least radial dimension, axial dimension and circumferential dimension, and the airflow constraints include that the airflow takes the same amount of time to reach the target position in each dimension; Based on the surface design criteria and the airflow velocities in the multiple dimensions, the surface parameters of each partition are determined; Based on the profile design criteria and the airflow velocities in the multiple dimensions, the profile parameters for each zone are determined; The design result of the guide vane is determined by combining the surface parameters and profile parameters of each partition.

2. The guide vane design method as described in claim 1, characterized in that, The airflow constraint includes: ； ； in, Displacement in the radial dimension The radius of the target location. The radius of the air inlet is... The airflow velocity in the radial dimension. The displacement in the circumferential dimension. The airflow velocity in the circumferential dimension. The displacement is in the axial dimension. The airflow velocity in the axial dimension. Duration.

3. The guide vane design method as described in claim 1 or 2, characterized in that, The radial airflow velocity includes: ； in, The airflow velocity in the radial dimension is... Let r be the flow rate of the airflow, and r be the radius of the air inlet. Let b be the radius of the incoming airflow, and b be the width of the air inlet; And / or, the airflow velocity in the axial dimension includes: ； in, The airflow velocity is defined as the axial dimension. The displacement is in the axial dimension. The airflow velocity in the radial dimension. The radius of the target location. The radius of the air inlet; And / or, the airflow velocity in the circumferential dimension includes: ； in, The airflow velocity in the circumferential dimension is... Let be the rotational angular velocity of the impeller of the centrifugal axial flow fan. Let be the radius of the incoming airflow. The slip coefficient, The radius of each partition near the hub. The radius of each partition near the wind shield.

4. The guide vane design method as described in claim 1, characterized in that, The surface parameters include axial distance; The surface design criteria include the axial distance criterion: ； in, Let i be the axial distance of partition i. The airflow velocity is defined as the axial dimension. The airflow velocity in the radial dimension is... The radius of the target location. The radius of the air inlet; And / or, the surface parameters include circumferential deflection angle; The surface design criteria include the circumferential deflection angle criterion: ； in, Let i be the circumferential deflection angle of partition i. Let be the rotational angular velocity of the impeller of the centrifugal axial flow fan. The airflow velocity in the radial dimension is... The radius of the target location. The radius of the air inlet.

5. The guide vane design method as described in claim 1, characterized in that, The profile parameters include the radius of curvature; The profile design criteria include the radius of curvature design criteria: ； in, Let be the radius of curvature of partition i. Based on the radius of curvature, The maximum airflow velocity in the circumferential dimension. The airflow velocity is defined as the circumferential dimension, and k is a preset parameter. And / or, the profile parameters include the angle of attack; The profile design criteria include the angle of attack design criteria: ； in, Let i be the angle of attack for partition i. The airflow velocity in the radial dimension is... The airflow velocity in the circumferential dimension is... For angle of attack compensation.

6. A centrifugal axial flow fan, characterized in that, The guide vanes of the centrifugal axial flow fan are designed according to the guide vane design method of the centrifugal axial flow fan as described in any one of claims 1-5.

7. A smart appliance, characterized in that, The smart appliance includes the centrifugal axial flow fan as described in claim 6.

8. The intelligent electrical appliance as described in claim 7, characterized in that, The smart appliance also includes a controller and a voice receiving module; The controller is electrically connected to the centrifugal axial flow fan and the voice receiving module respectively. The controller is used to send control commands to the centrifugal axial flow fan according to the user commands received by the voice receiving module. The control commands adjust the airflow speed of the centrifugal axial flow fan.

9. An electronic device, characterized in that, The electronic device includes a processor and a memory, wherein the memory stores at least one instruction or at least one program, and the processor loads and executes the at least one instruction or at least one program to implement the guide vane design method of the centrifugal axial flow fan as described in any one of claims 1-5.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the guide vane design method for the centrifugal axial flow fan as described in any one of claims 1-5.

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