Axial flow wind wheel and air conditioner
By providing spaced-arranged protrusions on the suction surface of the axial flow wind wheel blades, the vortex-detached noise problem caused by the flow separation of the air blades is solved, and noise reduction is achieved.
Patent Information
- Application Number
- CN202422547630.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-10-21
AI Technical Summary
The surface of the existing axial flow wind wheel is smooth, causing the airflow to flow and separate when it flows through the suction surface of the air blade, forming a large-scale vortex area, thereby generating vortex-detached noise.
A plurality of protrusions are provided on the suction surface of the air blade, and the protrusions are arranged at the root edge of the leaf toward the top edge of the leaf. The air flow flows through the protrusions, and obtain acceleration and attach to the suction surface to suppress the development of the vortex region.
It effectively suppresses the development of the vortex region, weakens the intensity of the vortex at the trailing edge of the leaf, and reduces the vortex-detached noise.
Smart Images
Figure CN223152361U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of air conditioners, and particularly relates to an axial flow impeller and an air conditioner. Background Art
[0002] In the air duct system of an existing air conditioner outdoor unit, an axial flow impeller is often used to meet the requirements of large air volume, low energy consumption and low noise. The surface of the blades of the axial flow impeller is usually a smooth surface, and the blades as a whole present an arc, which causes the air flow to generate flow separation before reaching the trailing edge of the blade when flowing through the suction surface of the blade, thus forming a large-scale vortex area at the tail of the blade, and further generating vortex shedding noise. Summary of the Utility Model
[0003] The main object of the utility model is to provide an axial flow impeller and an air conditioner, aiming to reduce the vortex shedding noise of the axial flow impeller.
[0004] To achieve the above object, the axial flow impeller proposed by the utility model includes a hub and a plurality of blades. The plurality of blades are arranged on the hub. The blade edge of the blade includes a blade root edge and a blade tip edge which are oppositely arranged, and the blade root edge is connected to the hub; a plurality of protrusions are arranged on the suction surface of the blade, and the plurality of protrusions are arranged at intervals in the direction from the blade root edge to the blade tip edge.
[0005] In one embodiment, the blade edge of the blade further includes a leading edge and a trailing edge, and the blade root edge, the leading edge, the blade tip edge and the trailing edge are connected in sequence; at the same circumferential position of the blade, the circumferential span from the leading edge to the trailing edge is S, and the protrusions are arranged at a position where the distance from the leading edge of the blade is between 0.3S and 0.6S.
[0006] In one embodiment, the distance between two adjacent protrusions is arranged to decrease in the direction from the leading edge to the trailing edge.
[0007] In one embodiment, the protrusion has a first windward surface and a second windward surface, and the first windward surface and the second windward surface are connected and arranged in a sharp angle shape, and the sharp angle of the sharp angle surface faces the leading edge.
[0008] In one embodiment, the angle between the first windward surface and the second windward surface is not less than 20° and not more than 60°.
[0009] In one embodiment, the height of the protrusion is not less than 0.5 mm and not more than 1.5 mm.
[0010] In one embodiment, the raised portion includes a first raised sub-portion and a second raised sub-portion that are connected to each other. The first windward surface is located on the first raised sub-portion, and the second windward surface is located on the second raised sub-portion. The first raised sub-portion is arranged in a long strip shape; and / or, the second raised sub-portion is arranged in a long strip shape.
[0011] In one embodiment, the length of the first raised sub-portion is not less than 10 times the height of the raised portion and not greater than 20 times the height of the raised portion;
[0012] and / or, the length of the second raised sub-portion is not less than 10 times the height of the raised portion and not greater than 20 times the height of the raised portion.
[0013] In one embodiment, the width of the first raised sub-portion is not less than 3 times the height of the raised portion and not greater than 5 times the height of the raised portion;
[0014] and / or, the width of the second raised sub-portion is not less than 3 times the height of the raised portion and not greater than 5 times the height of the raised portion.
[0015] The present utility model also provides an air conditioner, which includes the axial flow impeller described in any one of the foregoing embodiments.
[0016] The technical solution of the present utility model is to provide a plurality of raised portions on the suction surface of the blade, and the plurality of raised portions are arranged at intervals in the direction from the blade root edge to the blade tip edge. In this way, during the high-speed rotation of the axial flow impeller, the air flow passes between the raised portions, so that the air flow can be accelerated to a certain extent when passing through the raised portions, and thus can continue to adhere to the surface of the suction surface without separation, thereby suppressing the development and growth of the vortex region, weakening the intensity of the vortex at the trailing edge of the blade, and further reducing the vortex shedding noise. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] 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, other drawings can be obtained based on the structures shown in these drawings without creative efforts.
[0018] Figure 1 It is a schematic structural diagram of an embodiment of the axial flow impeller provided by the present utility model;
[0019] Figure 2 It is Figure 1 the other side view of
[0020] Figure 3 It is Figure 2 the other side view of
[0021] Figure 4 is Figure 3 The enlarged view at position A in
[0022] Explanation of the reference numerals in the drawings:
[0023] 10. Wind turbine;
[0024] 100. Wind blade; 110. Blade edge; 111. Root edge of the blade; 112. Leading edge of the blade; 113. Tip edge of the blade; 114. Trailing edge of the blade; 120. Protrusion; 121. First windward surface; 122. Second windward surface; 123. First protruding sub - part; 124. Second protruding sub - part.
[0025] 200. Hub.
[0026] 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. Detailed implementation manners
[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described 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 of 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 belong to the scope of protection of the present utility model.
[0028] 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 positional relationship and movement conditions between components in a certain specific posture. If this specific posture changes, the directional indications will also change accordingly.
[0029] In addition, if there are descriptions involving "first", "second", etc. 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 the solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. 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 scope of protection required by the present utility model.
[0030] The present utility model provides an axial flow impeller, aiming to reduce the vortex shedding noise of the axial flow impeller. The axial flow impeller of the present utility model can be applied to fans, air conditioners, etc.
[0031] Please refer to Figures 1 to 4 , in an embodiment of the present utility model, the axial flow impeller 10 includes a hub 200 and blades 100. Generally, the number of blades 100 is multiple, and usually multiple blades 100 are evenly spaced on the outer circumferential of the hub 200. The hub 200 is used to connect with a driving motor, and is driven by the driving motor to rotate, thereby driving the blades 100 to rotate, so as to guide the air flow inside the air conditioner to the outdoor side and exhaust air to the outdoor side. As for the number of blades 100, there is no specific limitation, and it can be 3 to 6. In this embodiment, the number of blades 100300 is 3.
[0032] The blade 100 has a blade edge 110. The blade edge 110 of the blade 100 refers to the boundary part of the blade 100. Generally, the blade edge 110 of the blade 100 includes the root edge 111, the leading edge 112, the tip edge 113 and the trailing edge 114. The root edge 111, the leading edge 112, the tip edge 113 and the trailing edge 114 are connected in sequence. Among them, the root edge 111 of the blade 100 is connected to the hub 200.
[0033] In this embodiment, a plurality of protrusions 120 are provided on the suction surface of the blade 100, and the plurality of protrusions 120 are arranged at intervals in the direction from the root edge 111 towards the tip edge 113. Among them, the shape and structure of the protrusion 120 are various. For example, it can be Figure 4 the pointed angle shape shown, or it can also be trapezoidal, oval or strip-shaped, etc. The protrusion 120 is usually integrally formed with the blade 100. Preferably, Figure 4 the pointed angle shape shown, two vortices with opposite rotation directions can be formed at the tail end of the protrusion 120, thereby weakening the vortex intensity near the trailing edge 114, and further reducing the vortex shedding noise.
[0034] The technical solution of the present utility model is to provide a plurality of protrusions 120 on the suction surface of the blade 100, and the plurality of protrusions 120 are arranged at intervals in the direction from the root edge 111 towards the tip edge 113. In this way, during the high-speed rotation of the axial flow impeller 10, the air flow passes through between the protrusions 120, so that the air flow obtains a certain acceleration after passing through the protrusions 120, and thus can continue to adhere to the surface of the suction surface without separation, further inhibiting the development and growth of the vortex region, weakening the intensity of the vortex at the trailing edge 114, and further reducing the vortex shedding noise.
[0035] Further, please refer to Figure 2, at the same circumferential position of the wind blade 100, the circumferential span from the blade leading edge 112 to the blade trailing edge 114 is S, and the convex portion 120 is provided at a position on the wind blade 100 where the length from the blade leading edge 112 is between 0.3S and 0.6S.
[0036] In this embodiment, the convex portion 120 can be at positions of 0.30S, 0.35S, 0.40S, 0.45S, 0.50S, 0.55S or 0.60S. However, the convex portion 120 should not be set at a position less than 0.3S from the blade leading edge 112, otherwise the effect of pushing the airflow separation point backward is not obvious and the noise reduction effect is poor; the convex portion 120 should not be set at a position greater than 0.6S from the blade leading edge 112, otherwise the convex portion 120 will affect the stability of the airflow flowing on the suction surface. Therefore, in this embodiment, the convex portion 120 is provided at a position on the wind blade 100 where the length from the blade leading edge 112 is between 0.3S and 0.6S.
[0037] It can be understood that the convex portion 120 has a first end and a second end which are oppositely arranged. The first end is the end of the convex portion 120 closest to the blade leading edge 112, and the second end is the end of the convex portion 120 farthest from the blade leading edge 112. The convex portion 120 is provided at a position on the wind blade 100 where the length from the blade leading edge 112 is between 0.3S and 0.6S. That is, on the same circumference, the distance between the first end of the convex portion 120 and the blade leading edge 112 is greater than 0.3S, and the distance between the second end of the convex portion 120 and the blade leading edge 112 is less than 0.6S.
[0038] In a preferred embodiment, the distance between two adjacent convex portions 120 is set to decrease in the direction from the blade leading edge 112 towards the blade trailing edge 114. In this way, the distance between two adjacent convex portions 120 gradually decreases, which helps to increase the kinetic energy of the airflow. As the airflow passes through the gradually decreasing distance, the speed of the airflow will increase, so that the airflow adheres more closely to the surface of the wind blade 100, making the separation point of the airflow and the wind blade 100 move backward, thereby reducing the vortex noise generated on the surface of the wind blade 100.
[0039] In an exemplary embodiment, please refer to Figure 3 and Figure 4 , the convex portion 120 has a first windward surface 121 and a second windward surface 122. The first windward surface 121 and the second windward surface 122 are connected and arranged in a sharp-corner shape, and the sharp corner of the sharp-corner surface faces the blade leading edge 112. In this way, the sharp-corner shape of the convex portion 120 can form two vortices with opposite rotation directions at the tail end of the convex portion 120, weakening the vortex intensity near the blade trailing edge 114, and thus reducing the vortex shedding noise.
[0040] Based on the previous embodiment, in order to enable the convex portion 120 to have an obvious flow guiding effect, the included angle between the first windward surface 121 and the second windward surface 122 is not less than 20° and not more than 60°. As Figure 4 shown by α in
[0041] In another preferred embodiment, in order to enable the convex portion 120 to have an obvious flow guiding effect, the height of the convex portion 120 is not less than 0.5 mm and not more than 1.5 mm. Exemplarily, the value range of the height of the convex portion 120 includes but is not limited to 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm. When the height of the convex portion 120 is between 0.5 mm and 1.5 mm, the air flow can be moderately disturbed, so that sufficient disturbance is generated on the surface of the wind blade 100 to break the formation of the eddy current. Too low convexity may not be sufficient to change the air flow path, while too high convexity may increase the resistance and cause a decrease in energy efficiency.
[0042] In the exemplary embodiment, please continue to refer to Figure 3 and Figure 4 , the convex portion 120 includes a first convex sub-portion 123 and a second convex sub-portion 124 which are connected to each other. The first windward surface 121 is located on the first convex sub-portion 123, and the second windward surface 122 is located on the second convex sub-portion 124; the first convex sub-portion 123 is arranged in a long strip shape; and / or, the second convex sub-portion 124 is arranged in a long strip shape. In this way, the convex portion 120 can have a flow guiding effect, and at the same time, the material used for the convex portion 120 can be reduced, the total weight of the wind blade 100 can be reduced, and the production cost can be lowered.
[0043] In one embodiment, please continue to refer to Figure 3 and Figure 4 , the length of the first convex sub-portion 123 is not less than 10 times the height of the convex portion 120 and not more than 20 times the height of the convex portion 120;
[0044] In this embodiment, as Figure 4 shown by L in
[0045] Among them, the height of the convex portion 120 is not less than 0.5 mm and not more than 1.5 mm. Then the value of the length L of the first convex sub-portion 123 is between 5.0 mm and 15.0 mm. Exemplarily, the value of the length L of the first convex sub-portion 123 includes but is not limited to 5.0 mm, 6.0 mm, 7.0 mm, 8.0 mm, 9.0 mm, 10.0 mm, 11.0 mm, 12.0 mm, 13.0 mm, 14.0 mm or 15.0 mm, etc.
[0046] In another embodiment, the length of the second convex sub-portion 124 is not less than 10 times the height of the convex portion 120 and not more than 20 times the height of the convex portion 120. The length of the second convex sub-portion 124 can be between 5.0 mm and 15.0 mm. Exemplarily, the value of the length of the second convex sub-portion 124 includes but is not limited to 5.0 mm, 6.0 mm, 7.0 mm, 8.0 mm, 9.0 mm, 10.0 mm, 11.0 mm, 12.0 mm, 13.0 mm, 14.0 mm or 15.0 mm, etc.
[0047] It can be understood that the lengths of the first convex sub-portion 123 and the second convex sub-portion 124 can be equal or unequal.
[0048] In one embodiment, please continue to refer to Figure 3 and Figure 4 , the width of the first convex sub-portion 123 is not less than 3 times the height of the convex portion 120 and not more than 5 times the height of the convex portion 120.
[0049] Among them, the height of the convex portion 120 is not less than 0.5 mm and not more than 1.5 mm. As shown in B of Figure 4 , the value of the width of the first convex sub-portion 123 is between 1.5 mm and 7.5 mm. Exemplarily, the value of the width of the first convex sub-portion 123 includes but is not limited to 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm, 6.5 mm, 7.0 mm or 7.5 mm.
[0050] In another embodiment, the width of the second protruding sub - portion 124 is not less than 3 times the height of the protruding portion 120 and not greater than 3 times the height of the protruding portion 120. Wherein, the height of the protruding portion 120 is not less than 0.5 mm and not greater than 1.5 mm, then the width of the second protruding sub - portion 124 ranges from 1.5 mm to 7.5 mm. Exemplarily, the values of the width of the second protruding sub - portion 124 include, but are not limited to, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm, 6.5 mm, 7.0 mm or 7.5 mm.
[0051] It can be understood that the widths of the first protruding sub - portion 123 and the second protruding sub - portion 124 may be equal or unequal.
[0052] The present utility model also provides an air conditioner, which includes an air - conditioner main body and an axial - flow fan 10. The specific structure of the axial - flow fan 10 refers to the above - mentioned embodiments. Since this air conditioner adopts all the technical solutions of the above - mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above - mentioned embodiments, and will not be elaborated herein one by one.
[0053] Among them, the air conditioner may be a window - type air conditioner, a split - type air conditioner or a cabinet - type air conditioner. If the air conditioner is a window - type air conditioner, the axial - flow fan 10 is arranged on the outdoor side of the window - type air conditioner; if the air conditioner is a split - type air conditioner, the axial - flow fan 10 is arranged in the outdoor unit of the split - type air conditioner. Of course, in other embodiments, the axial - flow fan 10 can also be installed in a fan or a blower.
[0054] In the following embodiments of the present utility model, the air conditioner is a split - type air conditioner including an outdoor unit of the air conditioner. The outdoor unit of the air conditioner includes a housing and a front panel installed on the housing. The front panel is provided with an air outlet, and an air - outlet grille is installed at the air outlet. The axial - flow fan 10 is installed in the housing, and the air - outlet side of the axial - flow fan 10 faces the air outlet. Among them, the axial - flow fan 10 is installed in the outdoor unit of the air conditioner. By the rotation of the axial - flow fan 10, air is sent to the outdoor side to achieve the purpose of discharging heat to the outdoor side. The axial - flow fan 10 can reduce the vortex shedding generated on the blade 100, and further reduce the vortex - shedding noise generated by the blade 100.
[0055] The above - mentioned are only exemplary embodiments of the present utility model, and do not limit the patent scope of the present utility model. All equivalent structural transformations 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 directly / indirectly applied in other related technical fields are 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 a plurality of blades provided on the hub, wherein the blade edge of each blade includes a root edge and a tip edge arranged oppositely, and the root edge is connected to the hub; a plurality of protrusions are provided on the suction surface of the blade, and the plurality of protrusions are arranged at intervals in the direction from the root edge towards the tip edge.
2. The axial flow wind wheel according to claim 1, wherein, The blade edge of the blade further includes a leading edge and a trailing edge, and the root edge, the leading edge, the tip edge and the trailing edge are connected in sequence; At the same circumferential position of the blade, the circumferential span from the leading edge to the trailing edge is S, and the protrusions are provided at a position where the distance from the leading edge of the blade is between 0.3S and 0.6S.
3. The axial flow wind wheel according to claim 2, characterized in that, The distance between two adjacent protrusions is arranged to decrease in the direction from the leading edge towards the trailing edge.
4. The axial flow wind wheel according to claim 3, wherein, The protrusion has a first windward surface and a second windward surface, and the first windward surface and the second windward surface are connected and arranged in a sharp angle shape.
5. The axial flow impeller according to claim 4, wherein, The angle between the first windward surface and the second windward surface is not less than 20° and not more than 60°.
6. The axial flow wind wheel according to claim 4, characterized in that, The height of the protrusion is not less than 0.5 mm and not more than 1.5 mm.
7. The axial flow wind wheel according to claim 6, wherein, The protrusion includes a first protrusion sub-part and a second protrusion sub-part connected to each other, the first windward surface is located on the first protrusion sub-part, and the second windward surface is located on the second protrusion sub-part; The first protrusion sub-part is arranged in a long strip shape; and / or, the second protrusion sub-part is arranged in a long strip shape.
8. The axial flow wind wheel according to claim 7, characterized in that, The length of the first protrusion sub-part is not less than 10 times the height of the protrusion and not more than 20 times the height of the protrusion; and / or, the length of the second protrusion sub-part is not less than 10 times the height of the protrusion and not more than 20 times the height of the protrusion.
9. The axial flow wind wheel according to claim 7, characterized in that, The width of the first protrusion sub-part is not less than 3 times the height of the protrusion and not more than 5 times the height of the protrusion; and / or, the width of the second protrusion sub-part is not less than 3 times the height of the protrusion and not more than 5 times the height of the protrusion.
10. An air conditioner, characterized in that, An axial flow wind wheel according to any one of claims 1 to 9.