Method and device for optimizing fan assembly, fan assembly and computer readable storage medium

Abstract

The invention relates to the technical field of intelligent household appliances, and discloses a method for optimizing a fan assembly, the fan assembly comprises a fan volute and an impeller located in the fan volute, and the impeller comprises a plurality of blades; the method comprises the following steps: determining a blade molded line and a midarc point of the blade molded line; the blade molded line is an arc-shaped curve of the blade cross section, and the middle arc point is the middle point of the arc-shaped curve; and the molded line of the fan volute is optimized according to the blade molded line and the midarc point. According to the method, the molded line of the fan volute is designed and optimized through the determined molded line of the fan blade and the midarc point of the molded line of the blade. The molded line of the optimized fan volute is matched with the flow direction of airflow flowing out of the blades, so that the airflow is smoother, vortex separation of rotation of the blades can be effectively restrained, and pneumatic noise is reduced. Therefore, under the condition of the backpressure working condition, the working efficiency of the fan can still be guaranteed, and the noise reduction effect is achieved. The invention further discloses a device for optimizing the fan assembly, the fan assembly and a computer readable storage medium.

Description

Technical Field

[0001] This application relates to the technical field of intelligent household appliances, for example, to a method and device for optimizing a fan assembly, a fan assembly, and a computer-readable storage medium. Background Art

[0002] An oil fume extractor usually has a fan assembly disposed in a smoke collecting hood to provide suction for the oil fume extractor to achieve the function of extracting oil fumes. The fan assembly is a centrifugal fan composed of a volute impeller and an electric motor that drives the impeller to rotate. In the centrifugal fan, gas enters the impeller axially, changes to radial when flowing through the impeller, and then enters the volute. The volute includes a diffuser section, in which the gas changes the flow direction and causes deceleration, and the deceleration converts kinetic energy into pressure energy. In this way, the driving and guiding effects of the fan on the air flow are realized. When designing the fan in the oil fume extractor, it is generally under a no-backpressure working condition. In actual use of the oil fume extractor, under a backpressure working condition, the actual flow field is worse than the designed flow field, resulting in problems such as low fan efficiency and high noise.

[0003] A volute, a centrifugal fan, and an oil fume extractor are disclosed in the related art. The profile line of the volute includes a first profile line segment, a second profile line segment, a third profile line segment, and a fourth profile line segment connected in sequence, and there is a smooth transition between two adjacent profile line segments. The third profile line segment forms the main body of the volute, the second profile line segment forms the volute tongue of the volute, and the third profile line segment is located on a logarithmic spiral curve. Since the logarithmic spiral curve where the third profile line segment is located is an arc segment generated with the same center, the curvature of the third profile line segment is continuous. At the same time, by designing a reference circle, the radial gap between the logarithmic spiral curve and the reference circle is gradually increased. In this way, the change of the polar radius of the third profile line segment is continuous, reducing the error of the volute profile line, and not only can prevent the generation of eddy currents in the volute to reduce the noise of the volute.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

[0005] The related art only discloses optimizing the third profile line segment of the volute by designing a reference circle; it does not disclose how to optimize the volute profile line according to the blades.

[0006] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of this application, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0007] To have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. The summary is not a general review, nor is it intended to identify key / important constituent elements or delineate the protection scope of these embodiments, but rather serves as a preamble to the subsequent detailed description.

[0008] Embodiments of the present disclosure provide a method and apparatus for optimizing a fan assembly, a fan assembly, and a computer-readable storage medium to optimize the volute profile through the blade design of the impeller, thereby improving the matching degree between the volute and the impeller.

[0009] In some embodiments, the fan assembly includes a fan volute and an impeller located within the fan volute, the impeller including a plurality of blades; the method includes: determining the mid-arc point of the blade profile; the blade profile is an arc curve of the blade cross-section, and the mid-arc point is the midpoint of the arc curve; optimizing the profile of the fan volute according to the blade profile and the mid-arc point.

[0010] In some embodiments, the apparatus includes: a processor and a memory storing program instructions, the processor being configured to execute the method for optimizing a fan assembly as described above when the program instructions are running.

[0011] In some embodiments, the fan assembly includes: a fan volute; an impeller rotatably located within the fan volute, the impeller including a plurality of blades; wherein, the profile of the fan volute is determined based on the apparatus for optimizing a fan assembly as described above.

[0012] In some embodiments, the computer-readable storage medium stores program instructions, and when the program instructions are running, they are used to cause a computer to execute the method for optimizing a fan assembly as described above.

[0013] The method and apparatus for optimizing a fan assembly, the fan assembly, and the computer-readable storage medium provided by the embodiments of the present disclosure can achieve the following technical effects:

[0014] In the embodiments of the present disclosure, the profile of the fan volute is designed and optimized through the determined fan blade profile and the mid-arc point of the blade profile. The optimized profile of the fan volute matches the flow direction of the air flow flowing out of the blade, making the air flow of the fan smoother, effectively suppressing the vortex detachment during blade rotation, and reducing the aerodynamic noise. At the same time, the matching degree between the impeller and the fan volute is improved, and the force generated by the high-speed air flow flowing out of the impeller impacting the volute wall surface is also weakened, thereby reducing the energy loss and further reducing the aerodynamic noise. In this way, the fan can still ensure the working efficiency of the fan and achieve the noise reduction effect under the condition of a back-pressure working condition.

[0015] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and wherein:

[0017] Figure 1 is a schematic diagram of a method for optimizing a fan assembly provided by an embodiment of the present disclosure;

[0018] Figure 2 is a schematic diagram of optimizing the high-work curve in the fan volute profile in the method provided by an embodiment of the present disclosure;

[0019] Figure 3 is a schematic diagram of a method for determining an intersection point in the method provided by an embodiment of the present disclosure;

[0020] Figure 4 is a schematic diagram of the structure of a fan from one perspective provided by an embodiment of the present disclosure;

[0021] Figure 5 is a schematic diagram of the structure of the same fan from another perspective provided by an embodiment of the present disclosure;

[0022] Figure 6 is a schematic diagram of the sectional structure of a fan provided by an embodiment of the present disclosure;

[0023] Figure 7 is Figure 6 an enlarged schematic diagram of the sectional view of an impeller of

[0024] Figure 8 is another schematic diagram of the sectional structure of a fan provided by an embodiment of the present disclosure;

[0025] Figure 9 is a schematic diagram of a device for optimizing a fan assembly provided by an embodiment of the present disclosure.

[0026] Reference numerals:

[0027] 10, volute; 101, air inlet; 102, air outlet; 103, front wheel cover; 104, rear wheel cover; 105, connecting side plate; 20, impeller; 201, blade; 300: device for optimizing fan assembly; 301, processor; 302, memory; 303, communication interface; 304, bus. Detailed implementation manners

[0028] In order to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The attached drawings are for reference and illustration only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, numerous details are provided to give a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be shown in a simplified manner to simplify the drawings.

[0029] In the description of the embodiments of the present disclosure, the terms "first", "second", etc. in the specification, claims and the above-mentioned drawings are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such data may be interchanged under appropriate circumstances so as to implement the embodiments of the present disclosure described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0030] Unless otherwise specified, the term "plurality" means two or more.

[0031] In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.

[0032] The term "and / or" is a description of the association relationship of objects and indicates that three relationships may exist. For example, A and / or B means: A or B, or, the three relationships of A and B.

[0033] The term "corresponding" may refer to an association relationship or a binding relationship. A corresponding to B means that there is an association relationship or a binding relationship between A and B.

[0034] Combined with Figure 1 As shown, the embodiments of the present disclosure provide a method for optimizing a fan assembly, including:

[0035] S101, the processor determines the blade profile and the mid-arc point of the blade profile.

[0036] S102, the processor optimizes the profile of the fan volute according to the blade profile and the mid-arc point.

[0037] Wherein, the blade profile is the arc curve of the blade cross-section, and the mid-arc point is the midpoint of the arc curve.

[0038] Here, the processor refers to a processor with design software such as simulation modeling software. The blade profile refers to the arc curve along the cross-section perpendicular to the axis of the impeller (blade cross-section), that is, the blade profile in the direction where the air flow enters from the blade inlet and exits from the outlet. The mid-arc point of the blade is the midpoint of the arc curve. The blade profile can be an arc line, a parabola or other curves, etc. The profile of the fan volute is the profile of the volute along the cross-section perpendicular to the axis of the impeller. Specifically, the profile of the volute refers to the contour curve of the inner wall of the connecting side plate of the volute. Usually, the profile of the fan volute is successively arranged in the circumferential direction and smoothly connected with a first straight line segment, a volute tongue profile segment, a spiral segment and a second straight line segment. Optimizing the profile of the fan volute mainly refers to optimizing the spiral segment.

[0039] It can be understood that the impeller rotates at high speed to accelerate the gas, then decelerates and changes the flow direction, converting kinetic energy into potential energy (i.e., pressure). In a centrifugal fan, the gas enters the blades of the impeller axially, the gas flows through the blades and changes into a radial air flow, and then enters the volute. When the high-speed air flow enters the blades, if the matching degree between the blade profile and the profile of the fan volute is not high, the impact force of the air flow flowing out of the blades on the volute is relatively large. At the same time, a turbulent boundary layer will be generated after the air flow passes through the blades, and the turbulent boundary layer can develop to generate vortex detachment, which will cause relatively large pulsations and increase the aerodynamic noise. Therefore, in the embodiments of the present disclosure, based on the blade profile and the mid-arc point, the profile of the fan volute is optimized. The matching of the blade profile and the volute profile can ensure that the high-speed air flow flowing out of the blade outlet will not be over-expanded in the volute, reducing the flow loss caused by the generation of backflow. This helps to reduce the noise of the fan under the condition of high static pressure work and achieve noise reduction. Among them, the mid-arc point of the blade profile has a greater influence on the air flow direction of the blade. Therefore, in the embodiments of the present disclosure, based on the blade profile and the mid-arc point, the profile of the fan volute is optimized. Specifically, the radian parameters of the spiral segment are optimized (such as arc length, the center of the circle where the radian is located, radius, etc.).

[0040] By using the method for optimizing the fan assembly provided by the embodiments of the present disclosure, the profile of the fan volute is designed and optimized through the determined fan blade profile and the mid-arc point of the blade profile. The optimized profile of the fan volute matches the air flow direction flowing out of the blade, making the air flow of the fan smoother, effectively suppressing the vortex detachment of the blade rotation, and reducing the aerodynamic noise. At the same time, the matching degree between the impeller and the fan volute is improved, and the acting force generated by the high-speed air flow flowing out of the impeller impacting the volute wall surface is also weakened, thereby reducing the energy loss and further reducing the aerodynamic noise. In this way, under the condition of a back-pressure working condition, the fan can still ensure the working efficiency of the fan and achieve the noise reduction effect.

[0041] Optionally, in step S102, the processor optimizes the profile of the fan volute according to the blade profile and the mid-arc point, including:

[0042] The processor optimizes the high-work curve in the fan volute profile according to the blade profile and the mid-arc point.

[0043] Among them, the volute profile includes a spiral curve, and the curve corresponding to the area where the air flow velocity at the blade outlet in the spiral curve is greater than the preset velocity is the high-work curve.

[0044] Here, optimizing the profile of the fan volute mainly refers to optimizing the profile curve segment corresponding to the high-work interval of the fan assembly. Among them, high work of the fan assembly indicates that the air flow velocity at the blade outlet is relatively fast. For this part of the relatively fast air flow, if the volute profile does not match the blade, after the air flow flows out of the blade, it will have excessive pressure expansion in the volute and form a backflow to generate a vortex. As a result, it is easy to generate vortex detachment when the blade rotates. Among them, the faster the air flow velocity, the easier the above problems occur. Therefore, the volute profile segment corresponding to the high-work curve is optimized and designed to improve the matching degree between the volute profile and the blade profile, so as to ensure the smoothness of the high-speed air outlet. In addition, the preset velocity can be reasonably set based on the fan model and fan parameters to determine the range of the high-work curve. As an example, for a high-power fan, the profile segment corresponding to the 3 o'clock to 9 o'clock direction of the fan volute profile is used as the high-work curve. As another example, for a general-purpose fan, the profile segment corresponding to the 4 o'clock to 8 o'clock direction of the fan volute profile can be used as the high-work curve.

[0045] Combined with Figure 2 Optionally, the processor optimizes the high-work curve in the fan volute profile according to the blade profile and the mid-arc point, including:

[0046] S121, the processor determines the i-th optimization point of the fan volute profile and the corresponding mid-arc point.

[0047] S122, the processor determines the (i + 1)-th intersection point according to the i-th optimization point and the corresponding mid-arc point.

[0048] S123, the processor optimizes the high-work curve between the i-th optimization point and the (i + 1)-th intersection point.

[0049] Among them, i = 1, 2,...; the first optimization point is a point at the connection of the high-work curve and the non-high-work curve, and is the intersection point of the line connecting the impeller center point and any blade mid-arc point and the fan volute profile; the (i + 1)-th optimization point is the intersection point of the line connecting the impeller center point and any blade mid-arc point and the optimized high-work curve.

[0050] Here, the high-work curve is optimized by using a multi-segment optimization method. Combined with Figure 6 、 8As shown, taking the center point O of the impeller as the origin of the coordinate system, a rectangular coordinate system is established. The profile segment of the fan volute profile corresponding to the 3 o'clock to 9 o'clock direction is used as the high work curve (i.e., the GJ curve in the figure) for explanation. At the junction of the high work curve and the non-high work curve, the first optimization point C1 (near 3 o'clock or 9 o'clock) is selected. The point C1 needs to meet two conditions. Condition 1: C1 is located at the junction of the high work curve and the non-high work curve. Condition 2: C1 is the intersection point of the line connecting the center point of the impeller and the mid-arc point of a certain blade profile and the volute profile. Then, based on the point C1 and the corresponding mid-arc point A1, the second intersection point B2 (C1 is the first intersection point) is determined. The second intersection point B2 is a point on the high work curve. And it can be understood that when the point C1 is a point near the G point, the point B2 is located on the left side of the point C1. When the point C1 is a point near the J point, the point B2 is located on the right side of the point C1. Specifically, the line segment OB1 between the point B1 and the center point O of the impeller can be determined based on the included angle range. Then, based on the relationship between the point B2 and the points A1 and C1, the point B2 that satisfies the three-point relationship on the line segment OB1 is determined.

[0051] Exemplarily, based on the included angle range, the line segment where the point B2 is located is determined (for example, the included angle range between OB1 and OC1 is 20° to 30°). And based on the distance from the center point of the impeller blade to the volute, the point B2 is determined on the connecting line segment. Another exemplarily, based on the included angle range, the line segment where the point B2 is located is determined. Then, a line is drawn based on the point A1, and the final point B2 is determined by combining the arc length between the points A1 and B2 and the relationship between the distance between the points A1 and C1.

[0052] Furthermore, a smooth curve can be made based on the points C1 and B2, so as to optimize this part of the curve in the volute profile. Then, in this optimized part of the curve, the second optimization point C2 is selected, that is, the point C2 is the intersection point of the line connecting the center point of the impeller and the mid-arc point of a certain blade profile (i.e., the point A2) and the optimized high work curve (that is, except for the first optimization point, other optimization points are the intersection points of the line connecting the center point of the impeller and any blade mid-arc point and the optimized high work curve). Based on C2 and the point A2, the point B3 is determined, and so on, until all the high work curves are optimized. It should be noted that the more the number of optimization points C i , the more the determined B i+1 points, and the better the optimization effect of the high work curve; therefore, the number of optimization points can be reasonably set based on requirements.

[0053] Optionally, in step S121, the processor determines the i-th optimization point of the fan volute profile and the corresponding mid-arc point, including:

[0054] The processor sequentially determines the i-th optimization point of the fan volute profile according to the rotation direction of the impeller.

[0055] Here, optimizing the volute profile is to make the volute profile match the blade profile, so as to make the air flow field smooth, suppress the vortex detachment of the blade rotation, and reduce the aerodynamic noise. Among them, the direction of the air flow field is related to the rotation direction of the impeller. Therefore, the selection of multiple optimization points of the fan volute profile depends on the rotation direction of the impeller. Specifically, when the impeller rotates clockwise, the optimization point C i is set in sequence clockwise. When the impeller rotates counterclockwise, the optimization point C i is set in sequence counterclockwise. In this way, the air flow flowing out from the blade corresponding to the optimization point C i flows along the air flow field direction to the volute at the point B i+1 corresponding to the point, thereby weakening the impact force of the air flow flowing out from the blade on the volute in the high work interval section and being able to reduce the aerodynamic noise.

[0056] Combined with Figure 3 , optionally, in step S122, the processor determines the (i + 1)-th intersection point according to the i-th optimization point and the corresponding mid-arc point, including:

[0057] S1221, the processor determines the (i + 1)-th line segment where the (i + 1)-th intersection point is located according to the i-th line segment where the i-th optimization point and the corresponding mid-arc point are located; wherein, the included angle between the i-th line segment and the (i + 1)-th line segment satisfies a preset included angle range.

[0058] S1222, the processor makes an arc tangent to the blade profile of the mid-arc point with the mid-arc point corresponding to the i-th optimization point as the starting point, and takes the intersection point of the arc and the (i + 1)-th line segment as the i-th intersection point; the arc radius between the i-th intersection point and the corresponding mid-arc point and the straight-line distance between the i-th optimization point and the corresponding mid-arc point satisfy a preset relationship.

[0059] Combined with Figure 6 、 8 elaborate on the steps of determining the intersection point B i+1 . Based on the impeller rotation direction, determine the first optimization point C1 on the fan volute profile. In the embodiment of the present disclosure, the case where the impeller rotates clockwise is described. The impeller rotates clockwise, so the first optimization point C1 is near the point G. Select the first mid-arc point A1 near the point G, connect the points O and A1 to obtain the first line segment OA1, and the extended line of this line segment intersects the volute profile at the point C1 ( Figure 8The C1 point in the middle is located to the left of the G point and can also be located to the right of the G point). Determine a second line segment OB2 whose included angle with the line segment OA1 satisfies a preset included angle range. Starting from the middle arc point A1, draw an arc that is tangent to the volute profile at point A1. There is a second intersection point B2 between this arc and the line segment OB2. It can be understood that there is not only one arc that satisfies the above conditions, but there may be multiple arcs, that is, there are multiple second intersection points. Therefore, it is necessary to further screen and determine the required points from multiple second intersection points. That is, select the second intersection point B2 that satisfies the preset relationship. Specifically, the preset relationship refers to the relationship between the straight-line distance between the first optimization point C1 and the first middle arc point A1 and the arc length between the first middle arc point A1 and the second intersection point B2, that is, the relationship between the line segment A1C1 and the arc A1B2. The preset relationship is determined based on the pressure recovery of the air flow on the inner wall of the volute to ensure that the pressure recovery will not be excessive; thus avoiding losses caused by backflow. Other intersection points are also determined based on the above principles.

[0060] Optionally, in step S1222, the arc radius between the (i + 1)-th intersection point and the corresponding middle arc point and the straight-line distance between the i-th optimization point and the corresponding middle arc point satisfy a preset relationship, including:

[0061] 0.9L ≤ R ≤ 1.1L;

[0062] where L is the straight-line distance between the i-th optimization point and the corresponding middle arc point, and R is the radius of the circle where the arc between the (i + 1)-th intersection point and the corresponding middle arc point is located.

[0063] Here, the preset relationship is explained. When the above preset relationship is satisfied, it can be ensured that the high-speed air flow flowing out of the blade outlet will not be over-expanded in the volute, resulting in backflow and causing flow losses. At the same time, this setting condition also weakens the force generated by the high-speed air flow impacting the volute wall surface, reduces energy losses, and reduces aerodynamic noise. Under the high static pressure work of the volute, it helps to reduce the noise of the fan and achieve noise reduction. When R is less than 0.9L, the distance between the blade and the volute is relatively close, and the impact force of the flowing air on the volute is relatively large, which is easy to generate relatively large noise. When R is greater than 1.1L, the distance between the volute and the impeller is relatively far, and the volute is over-expanded, which is easy to generate backflow air flow and cause losses. Therefore, 0.9L ≤ R ≤ 1.1L. Exemplarily, the radius R of the arc AB can be 0.9L, L, 1.1L, etc.

[0064] Optionally, in step S1221, the preset included angle range is 20° to 30°.

[0065] Here, the high-work curve needs to match the blade profile, so that the airflow flowing out of the air outlet of the blade is smoother, reducing the aerodynamic noise. At the same time, it helps to reduce the force generated by the high-speed airflow flowing out of the impeller impacting the volute wall, reducing energy loss and further reducing the aerodynamic noise. When a is less than 20°, the impact force of the airflow flowing out of the air outlet of the blade on the volute is relatively large, and it is easy to generate relatively large noise. When a is greater than 30°, the deviation direction of the airflow flowing out of the blade is relatively large, interfering with the rotation direction of the impeller, affecting the air volume and the working efficiency of the fan. Therefore, when the preset included angle range is 20° to 30°, the matching degree between the high-work curve and the blade profile is higher.

[0066] Combined with Figure 9 As shown, the present disclosure embodiment provides a device 300 for optimizing a fan assembly, including a processor 301 and a memory 302. Optionally, the device 300 may further include a communication interface 303 and a bus 304. Among them, the processor 301, the communication interface 303, and the memory 302 can complete mutual communication through the bus 304. The communication interface 303 can be used for information transmission. The processor 301 can call the logical instructions in the memory 302 to execute the method for optimizing the fan assembly in the above embodiment.

[0067] In addition, when the logical instructions in the above-mentioned memory 302 are implemented in the form of a software functional unit and sold or used as an independent product, they can be stored in a computer-readable storage medium.

[0068] The memory 302, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the method in the present disclosure embodiment. The processor 301 executes functional applications and data processing by running the program instructions / modules stored in the memory 302, that is, implements the method for optimizing the fan assembly in the above embodiment.

[0069] The memory 302 may include a program storage area and a data storage area. Among them, the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 302 may include a high-speed random access memory and may also include a non-volatile memory.

[0070] Combined with Figures 4-7As shown in the figure, an embodiment of the present disclosure provides a fan assembly, which includes: a fan volute 10, an impeller 20 and a motor. The impeller 20 is rotatably located inside the fan volute 10. The impeller 20 includes a plurality of blades 201. The motor is drivingly connected to the impeller 20, and the motor can drive the impeller 20 to rotate inside the volute 10 around its axis. Among them, the profile line of the fan volute 10 is determined based on the aforementioned device for optimizing the fan assembly. Those skilled in the art can understand that the device 300 for optimizing the fan assembly can be adapted to a feasible product body, thereby realizing other feasible embodiments.

[0071] As Figure 4 , 5 shown in the figure, the volute 10 includes a front volute cover 103, a rear volute cover 104 and a connecting side plate 105 connected between the front volute cover 103 and the rear volute cover 104. The front volute cover 103, the rear volute cover 104 and the connecting side plate 105 enclose an installation cavity, and the impeller 20 is located inside the installation cavity. Among them, the air inlet 101 is located on the front cover plate or the rear cover plate, and the motor is connected to the side of the volute 10 facing away from the air inlet 101, so that the air flow can enter the inside of the impeller 20 axially from the air inlet 101. The air outlet 102 of the volute 10 is provided on one side of the volute 10. The air flow inside the impeller 20 flows out of the impeller 20 radially along the blades 201 of the impeller 20, and then flows into the volute 10, and flows out from the air outlet 102 under the action of the volute 10.

[0072] As Figures 5 to 7 shown in the figure, the blade 201 is an inclined arc-shaped structure, and the inclination direction of the blade 201 is consistent with the rotation direction of the fan, so that a spiral air flow can be formed when the air flow enters the fan.

[0073] As Figure 6 shown in the figure, the profile line of the volute 10 includes a first straight line segment DE, a volute tongue curve segment EF, a spiral curve segment FJ and a second straight line segment JK that are sequentially arranged in the circumferential direction and smoothly connected. Among them, the spiral curve segment FJ includes a high-work interval. The connection line between the center O of the impeller 20 and any point B on the high-work curve is OB, and the connection line between the center O of the impeller 20 and the mid-arc point A of a blade 201 is OA. The connection line between point A and point B forms an arc AB, and the arc AB is tangent to the spiral curve segment FJ at point B, and the arc AB is tangent to the curve of the blade 201 at point A. The included angle α between OB and OA satisfies 20° ≤ α ≤ 30°. When the impeller 20 rotates clockwise, OA and OB are arranged in sequence clockwise. When the impeller 20 rotates counterclockwise, OA and OB are arranged in sequence counterclockwise. The connection point of the extension line of OA along the radial direction of the impeller 20 and the volute 10 is C, and the length of the connection line AC is L. Among them, the radius of the arc AB is R, and 0.9L ≤ R ≤ 1.1L.

[0074] In addition, the air flow velocity at the outlet of the blade 201 corresponding to the interval of the second spiral segment GJ in the volute 10 is relatively high, resulting in a relatively high back pressure of the volute 10 at the second spiral segment GJ. Therefore, the second spiral segment GJ is a high-work interval. Any point B in the second spiral segment GJ and the mid-arc point A of the corresponding blade 201 satisfy the relationship of any one of the above items of the present application, which can improve the air flow outflow velocity of the blade 201 corresponding to the second spiral segment GJ, reduce the fan noise, reduce the energy loss, and improve the fan efficiency.

[0075] The embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, and the computer-executable instructions are configured to execute the method for optimizing the fan assembly described above.

[0076] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiment of the present disclosure. The foregoing storage medium may be a non-transitory storage medium, for example: a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disc, and other media that can store program codes.

[0077] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure, enabling those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. Embodiments merely represent possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terms used in this application are only for describing embodiments and do not limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to also include the plural forms. Similarly, as used in this application, the term "and / or" refers to any and all possible combinations of one or more of the associated listed items. Additionally, when used in this application, the term "comprise" and its variants "comprises" and / or "comprising" etc. mean the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or groups of these. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, or apparatus that comprises the element. In this document, what each embodiment focuses on may be the differences from other embodiments, and the same or similar parts between the embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method parts disclosed in the embodiments, the relevant parts may refer to the description of the method parts.

[0078] Those skilled in the art will realize that the units and algorithm steps of the examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, or in a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner can depend on the specific application and design constraints of the technical solution. The skilled person can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the embodiments of the present disclosure. The skilled person can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.

[0079] In the embodiments disclosed in this article, the disclosed methods, products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Additionally, the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect coupling or communication connection of devices or units can be in electrical, mechanical, or other forms. The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. Additionally, in the embodiments of the present disclosure, the various functional units can be integrated in one processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit.

[0080] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions marked in the block can occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks can also occur in a different order than that disclosed in the description. Sometimes, there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, depending on the functions involved. Each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A method for optimizing a fan assembly, characterized in that, The fan assembly includes a fan volute and an impeller located within the fan volute, the impeller including a plurality of blades; the method includes: Determine the blade profile and the mid-arc point of the blade profile; the blade profile is the arc curve of the blade cross-section, and the mid-arc point is the midpoint of the arc curve; Optimize the profile of the fan volute according to the blade profile and the mid-arc point.

2. The method according to claim 1, characterized in that, Optimizing the profile of the fan volute according to the blade profile and the mid-arc point includes: Optimize the high-work curve in the fan volute profile according to the blade profile and the mid-arc point; Wherein, the volute profile includes a spiral curve, and the high-work curve is the curve corresponding to the region where the air flow velocity at the blade outlet in the spiral curve is greater than the preset velocity.

3. The method according to claim 2, characterized in that, Optimizing the high-work curve in the fan volute profile according to the blade profile and the mid-arc point includes: Determine the i-th optimization point of the fan volute profile and its corresponding mid-arc point; Determine the (i + 1)-th intersection point according to the i-th optimization point and its corresponding mid-arc point; Optimize the high-work curve between the i-th optimization point and the (i + 1)-th intersection point; Wherein, i = 1, 2,...; the first optimization point is a point at the junction of the high-work curve and the non-high-work curve, and is the intersection point of the line connecting the impeller center point and any blade mid-arc point and the fan volute profile; the (i + 1)-th optimization point is the intersection point of the line connecting the impeller center point and any blade mid-arc point and the optimized high-work curve.

4. The method according to claim 3, wherein Determining the i-th optimization point of the fan volute profile includes: Determine the i-th optimization point of the fan volute profile in sequence according to the rotation direction of the impeller.

5. The method according to claim 3, wherein Determining the (i + 1)-th intersection point according to the i-th optimization point and its corresponding mid-arc point includes: Determine the (i + 1)-th line segment where the (i + 1)-th intersection point is located according to the i-th line segment where the i-th optimization point and its corresponding mid-arc point are located; wherein, the included angle between the i-th line segment and the (i + 1)-th line segment satisfies the preset included angle range; Take the mid-arc point corresponding to the i-th optimization point as the starting point to make an arc tangent to the blade profile of this mid-arc point at this mid-arc point, and take the intersection point of the arc and the (i + 1)-th line segment as the (i + 1)-th intersection point; the arc radius between the (i + 1)-th intersection point and its corresponding mid-arc point and the straight-line distance between the i-th optimization point and its corresponding mid-arc point satisfy the preset relationship.

6. The method according to claim 5, wherein The arc radius between the (i + 1)-th intersection point and its corresponding mid-arc point and the straight-line distance between the i-th optimization point and its corresponding mid-arc point satisfy the preset relationship, including: 0.9L ≤ R ≤ 1.1L; Wherein, L is the straight-line distance between the i-th optimization point and its corresponding mid-arc point, and R is the arc radius between the (i + 1)-th intersection point and its corresponding mid-arc point.

7. According to the method described in claim 5, wherein, The preset included angle range is 20° to 30°.

8. An apparatus for optimizing a fan assembly, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute the method for optimizing the fan assembly as described in any one of claims 1 to 7 when running the program instructions.

9. A fan assembly, characterized in that, Including: Fan volute; An impeller rotatably located within the fan volute, the impeller including a plurality of blades; Wherein, the profile of the fan volute is determined based on the device for optimizing the fan assembly as described in claim 8.

10. A computer-readable storage medium storing program instructions, characterized in that, When the program instructions are running, they are used to cause the computer to execute the method for optimizing the fan assembly as described in any one of claims 1 to 7.

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