Fan blade assembly and fan thereof

Abstract

The utility model belongs to the technical field of ventilation equipment, and discloses a fan blade assembly which comprises a fan blade part and an air guide structure arranged at the bottom of the fan blade part, the fan blade part is a sweepback type fan blade or a sweepforward type fan blade, and the air guide structure is a fillet structure or a chamfer structure or an air guide cover. In the rotating direction when the fan blade part rotates forwards, the installation angle and the inclination angle of the fan blade part are configured in the mode that under the condition that the fan blade assembly is installed on an air duct support in a matched mode and a back plate is installed over the fan blade part, the fan blade part can be promoted to achieve the air outlet function when the fan blade part rotates backwards. According to the utility model, the sweepback / sweepforward fan blades and the air guide structure are cooperatively arranged, an air flow separation point is delayed, and the distance h between the shadow surface of the air inlet of the back plate and the air inlet of the fan is regulated and controlled by combining the rectification effect of the flow guide plate, so that the fan blade P < lt > is formed; the technical bottleneck that a traditional centrifugal fan cannot output air in the reverse direction is solved.

Description

Technical Field

[0001] This utility model relates to the field of ventilation equipment technology, and in particular to a fan blade assembly and its fan. Background Technology

[0002] Currently, traditional fans face numerous technical bottlenecks in terms of airflow organization, operating efficiency, and multifunctionality. Existing axial fans generally employ straight-blade or non-swept axial fan blade designs, resulting in severe airflow separation and significant eddy current losses, especially at high speeds, which easily lead to airflow separation and energy loss. Furthermore, while axial fans can achieve forward and reverse rotation, they are limited by the available installation space; centrifugal fans, on the other hand, rely on centrifugal force for airflow in both forward and reverse rotation, making reverse airflow impossible. Utility Model Content

[0003] The main objective of this invention is to provide a fan blade assembly and its fan, aiming to solve the technical problems in the background art.

[0004] To achieve the aforementioned objectives, the first aspect of this utility model provides a fan blade assembly, comprising:

[0005] The fan blade portion and the air guide structure disposed at the bottom of the fan blade portion, wherein the fan blade portion is a swept-back fan blade or a swept-forward fan blade, and the air guide structure is a rounded corner structure, a chamfered structure, or an air guide cover;

[0006] Along the direction of rotation when the fan blades are operating in a forward rotational manner, the mounting angle and tilt angle of the fan blades are configured as follows:

[0007] When the fan blade assembly is adapted and installed on the air duct bracket, and a back plate is installed directly above the fan blade portion, it enables the fan blade portion to achieve the air outlet function when working in reverse; wherein, the air guide structure at the bottom of the fan blade portion is located between the fan blade portion and the mounting surface of the air duct bracket, and the fan blade portion achieves the air intake function when working in forward rotation.

[0008] In one possible implementation, the mounting angle of the fan blade portion ranges from +15° to +45°, or from -15° to -45°, and the tilt angle ranges from +25° to +50°, or from -25° to -50°.

[0009] In one possible implementation, when a back plate is installed directly above the fan blade portion, the distance h between the fan blade portion and the back plate is 15-50 mm, so that when the fan blade portion is working in reverse, a preset static pressure difference is formed around the fan blade portion.

[0010] In one possible implementation, the distance h between the fan blade portion and the back plate is 28.9 ± 0.5 mm.

[0011] In a possible implementation, the preset static pressure difference is: P_fan < P_air duct + P_back plate, where P is the static pressure.

[0012] In a possible implementation, the radius of the rounded corner of the air guiding structure is 10%-15% of the chord length of the fan blade, which is used to optimize the air flow separation characteristics.

[0013] In a possible implementation, the top of the fan blade part is the air inlet surface of the fan, which is different from the air inlet surface of the air duct of the fan. The height difference between the air inlet surface of the fan and the air inlet surface of the air duct is less than the axial thickness of the fan blade part.

[0014] In a possible implementation, it further includes: a reinforcement ring, and the reinforcement ring is arranged on the annular surface formed by the rim of the fan blade part.

[0015] In a possible implementation, when the reinforcement ring is arranged at the upper port of the annular surface, the plane where the upper end surface of the reinforcement ring is located is the air inlet surface of the fan.

[0016] The present utility model also protects a fan, which includes a fan blade assembly; the fan further includes:

[0017] An air duct bracket adapted to be installed with the fan blade assembly, and the air guiding structure at the bottom of the fan blade part is located between the installation surface of the fan blade part and the air duct bracket.

[0018] In a possible implementation, the air duct bracket is provided with an outlet system, and the outlet system includes N air outlets distributed at the bottom of the air duct bracket, where N≥1 and N is an integer;

[0019] The outlet system is configured as:

[0020] When the fan blade part rotates forward, taking the centrifugal force generated by the fan blade part as the main driving force, combined with the axial lift to drive the air flow to enter the air duct inlet of the fan from the air inlet of the fan, and output through the outlet system. <00​​​​​​​​​​​​​In a possible implementation, the air duct bracket is further provided with an arc-shaped flow deflector for suppressing air flow turbulence and / or changing the air flow trajectory.

[0026] A fan blade assembly and a fan of the present utility model have the following beneficial effects:

[0027] 1. The present utility model adopts the cooperative setting of the swept / forward-swept fan blade and the air guiding structure to delay the air flow separation point. Combining the rectifying effect of the flow deflector, by adjusting the distance h (15 - 50 mm, preferably 28.9 ± 0.5 mm) between the shadow surface of the back plate air inlet and the fan air inlet, P fan blade < P air duct + P back plate (P is the static pressure) is formed, solving the technical bottleneck that the traditional centrifugal fan cannot blow air in the reverse direction.

[0028] 2. The present utility model achieves efficient cooling in the forward rotation mode, realizes the thermal management function of the ventilation system with the cooperation of the static pressure difference, reduces the equipment maintenance frequency, and can be applied to industries such as refrigerator refrigeration and automotive seats. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of a fan blade assembly and a fan of an embodiment of the present utility model;

[0030] Figure 2 is an exploded schematic diagram of a fan blade assembly and a fan of an embodiment of the present utility model;

[0031] Figure 3 is a schematic cross-sectional view of the air duct bracket of a fan blade assembly and a fan of an embodiment of the present utility model;

[0032] Figure 4 is a schematic structural diagram of the swept axial flow fan blade of a fan blade assembly and a fan of an embodiment of the present utility model;

[0033] Figure 5 is a fan blade assembly and a fan of an embodiment of the present utility model Figure 3 in the front view;

[0034] Figure 6 is a schematic cross-sectional structure diagram of a fan blade assembly and a fan of an embodiment of the present utility model;

[0035] Figure 7 is a schematic structural diagram of the air duct bracket of an embodiment of the present utility model;

[0036] Figure 8 is a schematic structural diagram of the back plate of an embodiment of the present utility model;

[0037] Figure 9 is a schematic diagram of the installation angle of an embodiment of the present utility model;

[0038] Figure 10 This is a schematic diagram of the tilt angle of an embodiment of the present invention;

[0039] Figure 11 This is another cross-sectional structural schematic diagram of a fan blade assembly and its fan according to an embodiment of the present invention;

[0040] Figure 12 This is another cross-sectional structural schematic diagram of a fan blade assembly and its fan according to an embodiment of the present utility model;

[0041] Figure 13 This is a schematic diagram of another perspective of the structure of a fan blade assembly and its swept-back axial flow fan blade according to an embodiment of the present invention.

[0042] Figure 14 This is an embodiment of the present utility model. Figure 13 A top-view structural diagram;

[0043] in:

[0044] 1- Duct support; 101- Air outlet; 9- Swept-back or forward-swept fan blade; 10- Guide vane; 11- Air guiding structure; 12- Reinforcing ring; 13- Back panel air outlet; 14- Back panel air inlet; 15- Fan air inlet; 16- Annular flow channel; 17- Mounting surface of duct support.

[0045] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0046] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0047] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly and specifically defined.

[0048] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] Reference Figures 1-14 An embodiment of this utility model provides a fan blade assembly, comprising:

[0051] The fan blade portion and the air guide structure 11 disposed at the bottom of the fan blade portion, wherein the fan blade portion is a swept-back fan blade or a swept-forward fan blade 9, and the air guide structure 11 is a rounded corner structure, a chamfered structure, or an air guide cover.

[0052] Along the direction of rotation when the fan blades are operating in a forward rotational manner, the mounting angle and tilt angle of the fan blades are configured as follows:

[0053] When the fan blade assembly is adapted and installed on the air duct bracket 1, and a back plate is installed directly above the fan blade portion, it can enable the fan blade portion to achieve the air outlet function when working in reverse; wherein, the air guide structure 11 at the bottom of the fan blade portion is located between the fan blade portion and the mounting surface 17 of the air duct bracket, and the fan blade portion achieves the air intake function when working in forward rotation.

[0054] In one possible implementation, the top of the fan blade portion is the fan inlet surface, which is different from the fan duct inlet surface. The height difference between the fan inlet surface and the duct inlet surface is less than the axial thickness of the fan blade portion.

[0055] It should be noted that the top of the fan blade part is defined as the air inlet surface of the fan, which is different from the air inlet surface of the air duct (the inlet surface of the air duct support 1), and there is a height difference between the two. This height difference should be less than the axial thickness of the fan blade part to ensure smooth air intake and matching with the air duct.

[0056] The highest surface of the reinforcing ring 12 is the air inlet surface of the fan, and the air inlet surface is the air inlet surface of the air duct;

[0057] Such as Figure 9-10 As shown, in a possible implementation manner, the range of the installation angle of the fan blade part is from +15° to +45°, or from -15° to -45°, and the range of the inclination angle is from +25° to +50°, or from -25° to -50°; the installation angle range is 15° - 45°; when a back plate is installed directly above the fan blade part, the distance h between the fan blade part and the back plate is 15 - 50 mm, so that when the fan blade part rotates in reverse, a preset static pressure difference is formed around the fan blade part. Preferably, the distance h between the fan blade part and the back plate is 28.9 ± 0.5 mm.

[0058] Among them, when the angle α is in the counterclockwise direction of the OB line segment, α is a positive value. Conversely, the angle is negative; before tilting, EF is perpendicular to the rib surface, and the ∠FEF' after tilting is the tilt angle β. When EF' is in the counterclockwise direction of EF, β is considered positive, and vice versa.

[0059] When both α and β are positive, from the top view of the fan (such as Figure 14 as shown), when the fan rotates clockwise, it is a forward rotation, and the air enters the air duct from the air inlet surface of the fan; when rotating in reverse, the air leaves the air duct through the air inlet surface of the fan;

[0060] When both α and β are negative, from the top view of the fan (such as Figure 14 as shown), when the fan rotates counterclockwise, it is a forward rotation, and the air enters the air duct from the air inlet surface of the fan; when rotating in reverse, the air leaves the air duct through the air inlet surface of the fan;

[0061] When the fan rotates forward, the rotational speed is 800 - 1500 rpm, and the centrifugal force generated by the fan blade assembly is the main driving force. Combining with the axial lift, it drives the air flow to enter the air duct structure from the air inlet 15 of the fan and is output through the outlet system;

[0062] When the fan rotates in reverse, the rotational speed is 500 - 1200 rpm, and the sum of the static pressure provided by the back plate and the static pressure of the system impedance is greater than the static pressure of the fan itself, resulting in the reverse output of the air flow from the air inlet 15 of the fan.

[0063] In a possible implementation manner, the preset static pressure difference is: P_fan < P_air duct + P_back plate, where P is the static pressure.

[0064] In one possible implementation, the annular flow channel 16 with a tapered flare helps to improve the speed and efficiency of the incoming airflow, providing approximately 10% to 16% of the flow rate for the reverse-flowing air. Preferably, the distance from the highest surface of the reinforcing ring 12 on the fan blade assembly protruding from the inlet surface is 8.3 mm to facilitate reverse-flowing air.

[0065] like Figure 11-12 As shown, when the horn-shaped structure is present, the air inlet surface of the duct is the closed area formed by the circular top surface of the horn opening. In this case, the height of the duct inlet is the same as the height of the fan inlet 15. When the horn-shaped structure is absent, the air inlet surface of the duct is the closed circular surface formed by the highest inner ring at the duct inlet.

[0066] In one possible implementation, when the fan is rotating forward, the centrifugal force generated by the fan blade assembly is the main driving force, which, combined with the axial lift, drives the airflow from the fan inlet 15 into the duct structure and outputs it through the outlet system.

[0067] When the fan reverses, the sum of the static pressure provided by the back plate and the static pressure of the system impedance is greater than the static pressure of the fan itself, causing the airflow to be output in the reverse direction from the fan inlet 15.

[0068] In one possible implementation, the back plate is disposed on top of the air duct support 1.

[0069] The backplate is installed on the top of the duct support 1. The height difference h between the shaded surfaces of the backplate air inlet 14 and the fan air inlet 15 is set to 15-50mm, preferably 28.9±0.5mm, to form a preset static pressure difference. The sum of the static pressure provided by the backplate and the static pressure of the system impedance is greater than the static pressure of the fan itself, thereby causing the airflow to be output in the opposite direction.

[0070] The fan blade assembly uses swept-back fan blades (which can be replaced with swept-forward fan blades), with a preferred blade chord length of 65mm and an inclination angle of 38°. The air guide structure 11 uses a rounded corner design, with a corner radius of 12% of the fan blade chord length (i.e., 7.8mm). This size range can effectively eliminate airflow separation at the blade tip.

[0071] When the fan rotates forward: the control motor drives the fan blades to rotate at a speed of 1200 rpm. At this time, the centrifugal force generated by the fan blades is the main driving force, which, combined with the axial lift, draws airflow in from the fan inlet 15. After being rectified by the guide plate 10, the airflow forms a laminar flow state and is finally output simultaneously through the six outlets 101.

[0072] When reverse airflow is required: control the motor to rotate in the opposite direction at 900 rpm. At this time, the sum of the static pressure generated by the back plate and the static pressure of the system impedance exceeds the static pressure of the fan itself, forcing the airflow to be output in the opposite direction from the fan inlet 15.

[0073] Among them, the air guide structure 11 can be replaced with an air guide cover, the cover extension length of which is 18% of the fan blade chord length, and the fan blade tilt angle can be adjusted to 25°.

[0074] In one possible implementation, it further includes a reinforcing ring 12, which is disposed on the annular surface formed by the rim of the fan blade portion.

[0075] The reinforcing ring 12 on the fan blade assembly protrudes more than 1mm from the air inlet surface, providing additional stability.

[0076] like Figure 13 As shown, the surface of the wind turbine closest to the line of sight is the top surface, and the surface furthest away is the bottom surface.

[0077] Fan inlet surface:

[0078] ① When there is a reinforcing ring 12 on the top surface of the fan, the surface closed by the outer ring of the reinforcing ring 12 is the air inlet surface of the fan;

[0079] ② When there is no reinforcing ring 12 on the top surface of the fan, the closed circular surface formed by the points on the top surface through the outer edges of all the fan blades is the air inlet surface of the fan.

[0080] In one possible implementation, the radius of the rounded corner of the air guide structure 11 is 10%-15% of the fan blade chord length, which is used to optimize airflow separation characteristics.

[0081] This utility model also protects a fan, including a fan blade assembly; the fan further includes:

[0082] The air duct bracket 1 is adapted to be installed with the fan blade assembly, and the air guiding structure 11 at the bottom of the fan blade part is located between the fan blade part and the mounting surface 17 of the air duct bracket.

[0083] When the connection port between the air duct support 1 and the fan blade assembly is set as an annular flow channel 16 with a gradually narrowing horn-mouth structure, the air inlet surface of the fan and the air inlet surface of the air duct are at the same height.

[0084] When the connection port between the air duct support 1 and the fan blade assembly is set as an annular flow channel 16 with a non-flare-mouth tapering structure, the height difference between the fan inlet surface and the air duct inlet surface is >1mm.

[0085] In one possible implementation, the air guiding structure 11 has an air guiding function, and the connection with the fan is presented as a rounded corner structure, a chamfered structure, or an air guide shroud. An arc-shaped guide plate 10 is provided inside the air duct support 1. The radius of curvature of the guide plate 10 is tangent to the rotation trajectory of the fan blades, effectively suppressing airflow turbulence.

[0086] In one possible implementation, the duct support 1 is provided with an outlet system, which includes N air outlets 101 distributed at the bottom of the duct support 1, where N≥1 and N is an integer.

[0087] In one possible implementation, the air duct support 1 is provided with an arc-shaped guide plate 10 inside, which helps to further optimize the direction and speed of airflow.

[0088] In this embodiment, the fan includes a duct support 1, a fan blade assembly, a duct structure, and an outlet system. The duct support 1 is made of cast aluminum alloy to form an annular flow channel 16, and the inlet section is designed with a flared, tapering structure. The fan blade assembly is connected to the output shaft of the brushless motor via a hub flange.

[0089] The export system is configured as follows:

[0090] When the fan blades are rotating in the forward direction, the centrifugal force generated by the fan blades is the main driving force, which, combined with the axial lift, drives the airflow from the fan inlet 15 into the fan duct inlet, and then outputs it through the outlet system.

[0091] The fan also includes:

[0092] The back plate is installed directly above the fan blade section;

[0093] The backplate is configured as follows:

[0094] When the fan blades are reversed, a preset static pressure difference is formed around the fan blades, so that the sum of the static pressure provided by the back plate and the static pressure of the system impedance is greater than the static pressure of the fan itself, causing the airflow to be output in reverse from the fan inlet 15.

[0095] The air duct support 1 is also provided with an arc-shaped guide plate 10, which is used to suppress airflow turbulence and / or change the airflow trajectory.

[0096] The back panel is installed on the top of the duct support 1, and its air outlet 13 can be tightly fitted to the duct support 1 via a snap-fit ​​structure. The distance h between the shaded surface of the back panel air inlet 14 and the fan air inlet 15 is set to 28.9 mm (tolerance ±0.5 mm). This distance can form the optimal static pressure difference range (120-180 Pa), realizing stable switching under forward and reverse operation conditions. The outlet system includes six air outlets 101 evenly distributed at the bottom of the duct support 1.

[0097] Description: This fan achieves efficient bidirectional airflow through the coordinated design of swept-back or swept-forward fan blades 9 and air guide structure 11. During forward rotation, the fan blades rotate at 800-1500 rpm. Centrifugal force and axial lift drive the airflow from the back plate inlet 14 through the fan inlet 15 into the duct. After being rectified by the arc-shaped guide plate 10, the airflow is evenly distributed to the six outlets 101. The rounded corners / guide shroud of the air guide structure 11 suppress airflow separation. During reverse rotation, the fan blades rotate in the opposite direction at 500-1200 rpm. The static pressure difference (120-180 Pa) formed by the distance h (15-50 mm, preferably 28.9 ± 0.5 mm) between the shaded surface of the back plate inlet 14 and the fan inlet 15 forces the airflow to reverse. The reinforcing ring 12 enhances the rigidity of the fan blades, and the outlet system balances the air pressure, achieving a forward airflow of 850 m³ / h. 3 With a bidirectional function of / h and a reverse-to-forward ratio of 72%, turbulence intensity ≤8%, and energy efficiency improved by 27%, it is suitable for ventilation and reverse cleaning scenarios.

[0098] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A vane assembly, characterized by, The fan blade assembly comprises: a fan blade part and a wind guide structure arranged at the bottom of the fan blade part, the fan blade part being a backward-swept fan blade or a forward-swept fan blade, and the wind guide structure being a fillet structure, a chamfer structure or a wind guide cover; the installation angle and the inclination angle of the fan blade part are configured as: when the fan blade assembly is installed on a wind channel support and a back plate is installed above the fan blade part, the fan blade part can realize the outflow function when it works in reverse; wherein the wind guide structure at the bottom of the fan blade part is located between the fan blade part and the installation surface of the wind channel support, and the fan blade part realizes the inflow function when it works in forward rotation.

2. A leaf assembly according to claim 1, wherein The installation angle of the fan blade part ranges from 15° to 45°, or from -15° to -45°, and the inclination angle ranges from 25° to 50°, or from -25° to -50°.

3. A leaf assembly according to claim 1, wherein, When a back plate is installed above the fan blade part, the distance h between the fan blade part and the back plate is 15-50mm, so that a preset static pressure difference is formed around the fan blade part when it works in reverse.

4. A leaf assembly according to claim 3, wherein The distance h between the fan blade part and the back plate is 28.9±0.5mm.

5. A leaf assembly according to claim 3, wherein, The preset static pressure difference is Pfan blade < Pwind channel + Pback plate, wherein P is the static pressure.

6. A leaf assembly according to claim 1, wherein, The fillet radius of the wind guide structure is 10%-15% of the chord length of the fan blade, which is used to optimize the airflow separation characteristics.

7. A leaf assembly according to claim 1, wherein, The top of the fan blade part is a fan inlet surface, which is different from the wind channel inlet surface of the fan, and the height difference between the fan inlet surface and the wind channel inlet surface is less than the axial thickness of the fan blade part.

8. A leaf assembly according to claim 1, wherein Further comprising: a reinforcing ring arranged on the annular surface formed by the rim of the fan blade part.

9. A leaf assembly according to claim 8, wherein, When the reinforcing ring is arranged on the upper end of the annular surface, the upper end surface of the reinforcing ring is the fan inlet surface.

10. A fan, characterized by The fan further comprises: a wind channel support adapted to install the fan blade assembly, and the wind guide structure at the bottom of the fan blade part is located between the fan blade part and the installation surface of the wind channel support.

11. The fan of claim 10, wherein, The wind channel support is provided with an outlet system comprising N air outlets distributed at the bottom of the wind channel support, wherein N≥1, and N is an integer; The outlet system is configured as: when the fan blade part works in forward rotation, the centrifugal force generated by the fan blade part is the main driving force, combined with the axial lift to drive the airflow from the fan inlet into the wind channel inlet of the fan, and then output through the outlet system.

12. The fan of claim 10 or 11, wherein, The fan further comprises: a back plate installed above the fan blade part; The back plate is configured as: when the fan blade part works in reverse, a preset static pressure difference is formed around the fan blade part, so that the sum of the static pressure provided by the back plate and the system impedance static pressure is greater than the static pressure of the fan itself, resulting in the reverse output of the airflow from the fan inlet.

13. The fan of claim 12, wherein, The wind channel support is further provided with an arc-shaped flow guide plate for suppressing airflow turbulence and / or changing the airflow flow trajectory.

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