Axial flow wind wheel, axial flow fan and air supply equipment

Abstract

The utility model discloses an axial flow wind wheel, an axial flow fan and air supply equipment, and relates to the technical field of wind wheels. The blades are connected with the hub, each blade is provided with a blade top far away from the hub and a front edge located on the windward side of the blade, and a blade tip part is formed at the intersection part of the blade top and the front edge; on a projection plane perpendicular to the axis of the hub, the radius of the axial flow wind wheel is defined as R, and the linear distance between the center point A of the hub and the end point B of the blade tip part is defined as r; wherein r is not less than 0.7 R, and r is less than R. According to the technical scheme, turbulence is reduced, noise is lowered, and fan efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wind wheels, and particularly to an axial flow wind wheel, an axial flow fan and a air supply device. Background Art

[0002] At present, the axial flow fan technology has been widely used in household electrical appliances. The fan noise in household air conditioners is the most important design index. When the wind wheel rotates at a high speed, flow separation will occur, affecting the fan efficiency and fan noise. The axial flow wind wheel of the traditional axial flow fan will produce flow separation when rotating at a high speed, affecting the fan efficiency and generating relatively large fan noise. Moreover, in the air conditioning system, the requirements for the efficiency and noise of the wind wheel are getting higher and higher. The traditional axial flow wind wheel can no longer meet the latest air conditioning energy efficiency and noise requirements. There is an urgent need for a high-efficiency and low-noise axial flow wind wheel to adapt to the new air conditioning system. Summary of the Utility Model

[0003] The main purpose of the utility model is to provide an axial flow wind wheel, an axial flow fan and a air supply device, aiming to reduce turbulence, lower noise and improve the fan efficiency.

[0004] To achieve the above object, an axial flow wind wheel provided by the utility model includes:

[0005] a hub; and

[0006] blades connected to the hub, the blades having blade tips arranged away from the hub and leading edges located on the windward side of the blades, and a blade tip portion formed at the intersection of the blade tips and the leading edges;

[0007] On the projection plane perpendicular to the axis of the hub, the radius of the axial flow wind wheel is defined as R, and the linear distance between the center point A of the hub and the end point B of the blade tip portion is defined as r;

[0008] Wherein, r is not less than 0.7.R and r is less than R.

[0009] In one embodiment, r is not less than 0.7R and r is not greater than 0.9R.

[0010] In one embodiment, r is equal to 0.8R.

[0011] In one embodiment, the blade tip portion has a tip provided at an acute angle.

[0012] In one embodiment, the blade further has a trailing edge opposite to the leading edge, and a notch is provided at the connection between the blade tip and the trailing edge.

[0013] In one embodiment, the blade further has a trailing edge opposite to the leading edge, and the leading edge and / or the trailing edge has a wavy structure.

[0014] The present utility model further provides an axial flow fan, which includes a motor and the axial flow impeller as described above. The motor is drivingly connected to the axial flow impeller, and the motor is used to drive the axial flow impeller to rotate.

[0015] The present utility model further provides an air supply device, which includes the axial flow impeller or the axial flow fan as described above.

[0016] In an embodiment, the air supply device is an air conditioner, and the axial flow impeller is disposed in the outdoor unit and / or the indoor unit of the air conditioner.

[0017] In the technical solution of the present utility model, an axial flow impeller is disclosed. The key point of the solution lies in optimizing the working efficiency of the leading edge of the blade. Two key parameters are defined. R is the radius of the axial flow impeller, which is defined on the projection plane perpendicular to the axis of the hub. R is the straight-line distance between the center point A of the hub and the tip point B of the blade. By adjusting the geometric parameters of the blade, especially the position of the tip part of the blade, it is ensured that the leading edge of the blade can act on the air flow more efficiently. Thus, compared with the existing axial flow impellers, the ratio of r to R can be adjusted. When the ratio of r to R reaches this preset threshold value, the work done by the leading edge of the blade reaches the maximum efficiency. Therefore, when the ratio of r to R reaches this preset threshold value, the acting efficiency of the leading edge of the blade on the air can be maximized. Therefore, the optimized leading edge of the blade can more effectively utilize the passing air flow to do work. The optimized blade shape helps to reduce the turbulence and resistance generated when the air flow passes through, thereby reducing energy loss and noise. Thus, the working performance of the entire axial flow impeller is improved, such as increasing the power output of the impeller or reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0019] Figure 1 It is a schematic structural diagram of an embodiment of the axial flow impeller provided by the present utility model;

[0020] Figure 2 It is a schematic structural diagram of an embodiment of the outdoor unit of the air conditioner provided by the present utility model.

[0021] Explanation of the reference numerals in the drawings:

[0022] 100, axial flow impeller; 200, motor; 300, heat exchanger; 400, air outlet panel; 500, grille;

[0023] 10. Hub; 20. Blade; 21. Blade tip; 22. Leading edge; 23. Tip part; 24. Trailing edge; 25. Notch; A. Center point of the hub; B. End point of the tip part.

[0024] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0025] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0026] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0027] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0028] The present utility model provides an axial flow wind wheel, an axial flow fan and a ventilation device.

[0029] Axial flow fans are widely used in household electrical appliances. For example, most of the outdoor units of household air conditioners adopt axial flow fans. When the traditional axial flow impeller of an axial flow fan rotates at a high speed, flow separation will occur, which affects the fan efficiency and generates relatively large fan noise. Moreover, in the air conditioning system, the requirements for the impeller efficiency and noise are getting higher and higher. The traditional axial flow impeller can no longer meet the latest air conditioning energy efficiency and noise requirements. There is an urgent need for an axial flow impeller with high efficiency and low noise to adapt to the new air conditioning system.

[0030] The utility model provides an axial flow impeller 100. By optimizing the design of the structure of the axial flow impeller 100, it is possible to reduce turbulence, lower noise and improve the fan efficiency.

[0031] The axial flow impeller 100 or the axial flow fan having the axial flow impeller 100 can also be applied to a air supply device. Among them, the air supply device includes, but is not limited to, air conditioners, fans, air purifiers, dehumidifiers, humidifiers, etc. When the air supply device is an air conditioner, the axial flow impeller 100 can be arranged in the outdoor unit and / or the indoor unit of the air conditioner.

[0032] Taking the application of the axial flow impeller 100 to the outdoor unit of an air conditioner as an example, as Figure 2 shown, in an embodiment, the outdoor unit of the air conditioner includes a housing, and an axial flow impeller 100, a motor 200 and a heat exchanger 300 arranged in the housing. The housing has an air inlet and an air outlet. The heat exchanger 300 is arranged opposite to the air inlet, and the axial flow impeller 100 is arranged between the heat exchanger 300 and the air outlet. The axial flow impeller 100 is drivingly connected to the motor 200. When the outdoor unit of the air conditioner works, the motor 200 drives the axial flow impeller 100 to rotate, and can suck external air into the housing through the air inlet, exchange heat with the heat exchanger 300, and then send it out from the air outlet. Optionally, the housing has an air outlet panel 400 located on the front side. The air outlet panel 400 is provided with an air outlet, and a mesh cover 500 is arranged at the air outlet to prevent foreign objects from entering the interior of the outdoor unit of the air conditioner. By adopting the axial flow impeller 100 of the utility model, it is possible to reduce the noise and power of the outdoor unit of the air conditioner under the condition of realizing the same air volume, so that it can meet the latest air conditioning energy efficiency and noise requirements. The following mainly takes the implementation manner of the axial flow impeller 100 as an example for illustration.

[0033] Referring to Figure 1 , in the embodiment of the utility model, an axial flow impeller 100 includes:

[0034] a hub 10; and

[0035] blades 20 connected to the hub 10. The blades 20 have a blade tip 21 arranged away from the hub 10, and a leading edge 22 located on the windward side of the blades 20. A blade tip portion 23 is formed at the intersection of the blade tip 21 and the leading edge 22;

[0036] On the projection plane perpendicular to the axis of the hub 10, define the radius of the axial flow impeller 100 as R, and define the straight-line distance between the center point A of the hub 10 and the end point B of the blade tip 23 as r;

[0037] Among them, r is not less than 0.7R and r is less than R.

[0038] An axial flow impeller according to an embodiment of the present invention includes a hub 10 and blades 20. The number of the blades 20 may be multiple, and the multiple blades 20 are arranged at intervals on the outer periphery of the hub 10. Among them, the number of the blades 20 is generally at least two, for example, it may be two, three, four, five or more. Optionally, the number of the blades 20 is not less than two and not more than five. Exemplarily, three blades 20 are circumferentially arranged on the hub 10 at intervals and evenly. The shapes and thicknesses of the blades 20 are substantially the same to ensure the stability when the axial flow impeller 100 rotates. An air duct is formed between two adjacent blades 20. Taking a single blade 20 as an example, the blade root, blade tip 21, leading edge 22, blade tip part 23 and trailing edge 24 of the blade 20 are sequentially connected end to end to enclose the outer peripheral contour of the blade 20. Among them, the blade root is used to connect the hub 10, and the blade tip 21 is located on the side of the blade root away from the hub 10 to form the free end of the blade 20. In the air inflow direction, the leading edge 22 is located on the upstream side of the blade 20, and the trailing edge 24 is located on the downstream side of the blade 20. The axial flow impeller 100 is driven to rotate by a motor 200. Air flows into the blade 20 from the leading edge 22, and after obtaining a pressure rise by the work of the blade 20, it flows out from the trailing edge 24 of the blade 20, thereby realizing the air supply function. The projection plane perpendicular to the axis of the hub 10 is also the projection plane formed by the projection of the axial flow impeller 100 on the plane perpendicular to the axis of the hub 10.

[0039] In this embodiment, the radius R of the axial flow impeller 100 refers to the straight-line distance from the center point A of the hub 10 to the outermost edge of the blade tip 21 in the radial direction of the hub 10. The radius r of the blade tip portion 23 refers to the straight-line distance from the center point A of the hub 10 to the end point B of the blade tip portion 23 in the radial direction of the hub 10. By adjusting the ratio of R to r so that it falls within a preset threshold range, the angle of attack of the leading edge 22 of the blade can be optimized. The angle of attack refers to the angle between the chord line of the blade 20 (the straight line connecting the leading edge 22 and the trailing edge 24 arranged opposite to the leading edge 22) and the relative wind direction, thereby reducing resistance and increasing lift, and thus improving the efficiency of the entire axial flow impeller. When r is not less than 0.7R and r is not greater than R, that is, 0.7R ≤ r < R. For example, r can be 0.7R, 0.75R, 0.8R, 0.85R, 0.9R, 0.95R, etc. of R. It can be understood that when the ratio of r to R changes, in fact, the position of the blade tip portion 23 relative to the hub 10 is changed. If the ratio of r to R is small, it means that the blade tip portion 23 is closer to the center of the hub 10, which may cause the whole blade 20 to tend to be more parallel to the wind direction. On the contrary, if the ratio of R to r is large, the blade tip portion 23 is farther from the center of the hub 10, which may cause the whole blade 20 to tend to be more perpendicular to the wind direction. Therefore, when the inclination of the blade 20 changes, the angle between the leading edge 22 of the blade 20 and the wind direction also changes. By adjusting the ratio of r to R, the inclination degree of the blade 20 can be controlled, thereby adjusting the angle of attack of the blade 20 so that the angle between the leading edge 22 and the wind direction approaches the optimal value. It can be seen that when r is not less than 0.7R and within the range of r not greater than R, the angle between the leading edge 22 of the blade 20 and the wind direction can reach the optimum, which means that the blade 20 can obtain the maximum thrust under the condition of minimum resistance. Optimizing the design of the blade tip portion 23 helps to reduce eddy currents, thereby reducing the noise during operation, can reduce the stress concentration at the end of the blade 20, helps to improve the durability of the blade 20 and the stability of the overall structure, and thus improves the overall efficiency of the axial flow impeller 100.

[0040] Referring to Figure 1 , in the embodiment of the present utility model, wherein, r is not less than 0.7R and r is not greater than 0.9R.

[0041] When r is not less than 0.7R and not greater than 0.9R, that is, 0.7R ≤ r ≤ 0.9R, it can ensure that the ratio of the straight-line distance r between the center point A of the hub 10 and the end point B of the blade tip 23 to the wind wheel radius R should fall within this range. For example, r can be 0.7R, 0.75R, 0.8R, 0.85R, 0.9R, etc. of R. When r is not less than 0.7R and not greater than 0.9R, the best angle between the leading edge 22 and the wind direction can be achieved. This setting is to optimize the angle between the leading edge 22 of the blade 20 and the wind direction, so that the blade 20 can obtain the maximum thrust under the condition of minimum resistance. Optimizing the design of the blade tip 23 helps to reduce eddy currents, thereby reducing the noise during operation, and can reduce the stress concentration at the end of the blade 20, which helps to improve the durability of the blade 20 and the stability of the overall structure, thereby improving the overall efficiency of the axial flow wind wheel 100.

[0042] Referring to Figure 1 , in the embodiment of the present utility model, r is equal to 0.8R.

[0043] By setting the ratio of the straight-line distance r between the center point A of the hub 10 and the end point B of the blade tip 23 to the wind wheel radius R to 0.8, at this time, the area where the axial flow wind wheel 100 has the strongest work capacity is in the area of 0.8R. Therefore, the behavior of the air flow at the blade tip 23 can be optimized, and the leakage loss can be reduced. This setting is to optimize the angle between the leading edge 22 of the blade 20 and the wind direction, so that the blade 20 can obtain the maximum thrust under the condition of minimum resistance. Optimizing the design of the blade tip 23 helps to reduce eddy currents, thereby reducing the noise during operation, and can reduce the stress concentration at the end of the blade 20, which helps to improve the durability of the blade 20 and the stability of the overall structure, thereby improving the overall efficiency of the axial flow wind wheel 100.

[0044] Referring to Figure 1 , in the embodiment of the present utility model, the blade tip 23 has a tip set at an acute angle.

[0045] The acute angle design of the blade tip 23 helps to reduce the eddy currents at the end of the blade. When the blade 20 rotates, eddy currents will be generated at the end of the blade 20, and these eddy currents will cause additional resistance and noise. The acute angle design can reduce the generation of eddy currents, thereby reducing the resistance and noise levels. The acute angle design helps to optimize the angle between the leading edge 22 of the blade and the wind direction, that is, the angle of attack. When the angle of attack approaches the optimal value, the blade 20 can obtain the maximum thrust with the minimum resistance, thereby improving the overall efficiency of the wind wheel. The acute angle design can reduce the stress concentration at the end of the blade 20, which helps to improve the durability of the blade 20 and the stability of the overall structure. By reducing the stress at the end of the blade 20, the service life of the blade 20 can be extended. Therefore, designing the blade tip 23 as an acute angle can significantly improve the overall performance of the axial flow wind wheel 100, including efficiency, noise level, stability and adaptability.

[0046] Referring to Figure 1 , in the embodiment of the present utility model, the blade 20 further has a trailing edge 24 disposed opposite to the leading edge 22, and a notch 25 is provided at the connection between the blade tip 21 and the trailing edge 24.

[0047] The design of the notch 25 can change the airflow separation point at the end of the blade 20 and reduce the vortices generated due to airflow separation. The notch 25 can guide the airflow to transition more smoothly to the outflow side of the blade 20, avoiding the formation of strong air vortices, thereby improving the airflow distribution. The notch 25 can guide the airflow to transition more smoothly to the outflow side of the blade 20, avoiding the formation of strong air vortices, thereby improving the airflow distribution. Therefore, the design of the blade with the notch 25 is mainly to improve the aerodynamic performance of the blade 20, increase the efficiency, and reduce the noise during operation. It can be understood that the shape of the notch 25 can be circular or oval or triangular or trapezoidal or polygonal, or can be designed as a gradually changing shape, such as from wide to narrow or from narrow to wide, which can reduce airflow separation; it can also be designed as a wavy shape to further disperse the airflow and reduce the formation of vortices.

[0048] Referring to Figure 1 , in the embodiment of the present utility model, the blade 20 further has a trailing edge 24 disposed opposite to the leading edge 22, and the leading edge 22 and / or the trailing edge 24 has a wavy structure.

[0049] The wavy structure can reduce the friction between the airflow and the surface of the blade 20 and lower the resistance. The wavy structure helps the airflow to adhere more smoothly to the surface of the blade 20, reducing the formation of turbulence and vortices. The wavy structure helps to optimize the angle of attack of the blade 20 (i.e., the angle between the chord line of the blade 20 and the relative wind direction), thereby increasing the lift. The optimized angle of attack can ensure that the blade 20 maintains efficient aerodynamic performance under different wind speed conditions. The wavy structure helps to delay the airflow separation point on the surface of the blade 20, thereby reducing the resistance loss caused by airflow separation. Reducing airflow separation also helps to reduce the noise during operation. It can be understood that designing the edges of the leading edge 22 and the trailing edge 24 as a wavy structure is mainly to improve the aerodynamic performance of the blade, increase the efficiency, and reduce the noise during operation.

[0050] Referring to Figure 1 , in the embodiment of the present utility model, the number of the blades 20 is not less than two and not more than five.

[0051] In the design of the axial-flow wind wheel 100, the number of blades of the axial-flow wind wheel 100 is limited to not less than two and not more than five. With an appropriate number of blades 20, the aerodynamic performance of the axial-flow wind wheel 100 can be optimized, making the air flow distribution more uniform, reducing the air flow separation phenomenon, and improving the efficiency. Limiting the number of blades 20 can simplify the manufacturing process, reduce costs, and at the same time ensure the structural strength and durability of the axial-flow wind wheel 100. A reasonable number of blades can reduce the noise generated when the air flows through, and is suitable for application environments sensitive to noise. An appropriate number of blades helps to improve the balance of the wind wheel, reduce vibration, and ensure long-term stable operation. By reducing the number of blades, the manufacturing cost can be reduced while maintaining good performance. Therefore, by limiting the number of blades between two and five, this design aims to find a balance point that can not only improve the aerodynamic performance and efficiency of the wind wheel, but also achieve a better balance in terms of manufacturing cost, maintenance convenience, and noise control.

[0052] Referring to Figures 1 to 2 , the present utility model also proposes an axial-flow fan, including the axial-flow wind wheel 100 and a motor 200, the motor 200 is drivingly connected to the axial-flow wind wheel 100, and the motor 200 is used to drive the axial-flow wind wheel 100 to rotate. The specific structure of the axial-flow wind wheel 100 refers to the above-mentioned embodiment. Since this axial-flow fan adopts all the technical solutions of the above-mentioned all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated here one by one.

[0053] In this embodiment, the output shaft of the motor 200 is drivingly connected to the hub 10 of the axial-flow wind wheel 100. By driving the axial-flow wind wheel 100 to rotate through the motor 200, air flows in from the leading edge 23 of the blade 20, and after obtaining a pressure rise by the work of the blade 20, it flows out from the trailing edge 24 of the blade 20, thereby realizing the air supply function. And through the design of the above-mentioned axial-flow wind wheel 100, the fan efficiency can be improved, and under the condition of realizing the same air volume, the power and noise can be reduced.

[0054] The present utility model also proposes an air supply device, including an axial-flow wind wheel 100 or an axial-flow fan having an axial-flow wind wheel 100. The specific structure of the axial-flow wind wheel 100 refers to the above-mentioned embodiment. Since this air supply device adopts all the technical solutions of the above-mentioned all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated here one by one. Among them, the air supply device includes but is not limited to air conditioners, fans, air purifiers, dehumidifiers, humidifiers, etc.

[0055] In one embodiment, the air supply device is an air conditioner, and the axial-flow wind wheel 100 is arranged in the air conditioner outdoor unit and / or the air conditioner indoor unit of the air conditioner.

[0056] The above are only exemplary embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. An axial flow wind wheel, characterized in that, Comprising: a hub; and blades, connected to the hub, the blades having blade tips disposed away from the hub, and leading edges located on the windward side of the blades, a blade tip portion being formed at the intersection of the blade tips and the leading edges; On a projection plane perpendicular to the axis of the hub, defining the radius of the axial flow wind turbine as R, and defining the straight-line distance between the center point A of the hub and the end point B of the blade tip portion as r; wherein, r is not less than 0.7R and r is less than R.

2. The axial flow wind wheel according to claim 1, wherein, Wherein, r is not less than 0.7R and r is not greater than 0.9R.

3. The axial flow wind wheel according to claim 2, characterized in that, r is equal to 0.8R.

4. The axial flow wind wheel according to claim 1, characterized in that, The blade tip portion has a tip disposed at an acute angle.

5. The axial flow wind wheel according to claim 1, characterized in that, The blade further has a trailing edge disposed opposite to the leading edge, and a notch is provided at the connection between the blade tip and the trailing edge.

6. The axial flow wind wheel according to claim 1, characterized in that, The blade further has a trailing edge disposed opposite to the leading edge, and the leading edge and / or the trailing edge has a wavy structure.

7. The axial flow wind wheel according to any one of claims 1 to 6, characterized in that, The number of the blades is not less than two and not greater than five.

8. An axial flow fan, characterized in that, Comprising a motor and an axial flow wind turbine according to any one of claims 1 to 7, the motor being drivingly connected to the axial flow wind turbine, and the motor being configured to drive the axial flow wind turbine to rotate.

9. An air supply device, characterized in that, Comprising an axial flow wind turbine according to any one of claims 1 to 7, or comprising an axial flow fan according to claim 8.

10. The air supply device according to claim 9, characterized in that, The air supply device is an air conditioner, and the axial flow wind turbine is disposed in the outdoor unit and / or the indoor unit of the air conditioner.

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