Double-layer fan leaf and vehicle-mounted ventilation fan

Abstract

The utility model discloses a double -deck fan blade relates to the fan blade field. Double -deck fan blade, including wheel hub, including with wheel hub coaxial setting's middle ring, along wheel hub outer periphery side circumferential distribution's multiple inner fan blade and along middle ring outer periphery side circumferential distribution's multiple outer fan blade, inner fan blade is connected with middle ring inboard, in the projection drawing obtained to the plane projection on perpendicular to the axis, and inner fan blade leaf width L1 is from inside to outside by narrow gradually wide along radial, and outer fan blade leaf width L2 is from inside to outside by wide gradually narrow along radial, and the inclination angle alpha 1 of inner fan blade relative wheel hub center axis and the inclination angle alpha 2 of outer fan blade relative wheel hub center axis are all 88~95 DEG. After adopting the structure of the utility model, when the user needs to exchange air when driving the house car, can control switch and make double -deck fan blade normal rotation or reverse rotation, when double -deck fan blade normal rotation, can convey the fresh air outside the house car to the inside of the house car, when double -deck fan blade reverse rotation, can blow the air inside the house car to the outside of the house car, realize bidirectional exchange air, and the user has better experience when using.

Description

Technical Field

[0001] This utility model relates to the field of fan blades, and more particularly to a double-layer fan blade and a vehicle ventilation fan. Background Technology

[0002] With the development of technology and the improvement of living standards, RVs are becoming increasingly common in the market. When using RVs for travel, due to their living functions, users may spend long periods of time sleeping and resting inside. Therefore, the air quality inside RVs is crucial, making the presence of a vehicle-mounted ventilation fan particularly important. A vehicle-mounted ventilation fan helps exchange air between the RV's interior and exterior environments, improving air quality. Currently, most vehicle-mounted ventilation fans are unidirectional, blowing stale air from inside the RV to the outside or fresh air from outside into the RV. Unidirectional ventilation cannot meet the needs of users, resulting in a poor user experience. Utility Model Content

[0003] This invention addresses the problem that existing vehicle ventilation fans can only perform unidirectional ventilation, resulting in a poor user experience, by providing a double-layer fan blade and a vehicle ventilation fan.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A double-layer fan blade assembly includes a hub, a middle ring coaxially arranged with the hub and located on the outer side of the hub, a plurality of inner fan blades distributed circumferentially along the outer periphery of the hub, and a plurality of outer fan blades distributed circumferentially along the outer periphery of the middle ring. The inner fan blades are connected to the inner side of the middle ring. In a plane projection perpendicular to the axis, the width L1 of the inner fan blade gradually widens radially from the inside to the outside, and the width L2 of the outer fan blade gradually narrows radially from the inside to the outside. The tilt angle α1 of the inner fan blade relative to the central axis of the hub and the tilt angle α2 of the outer fan blade relative to the central axis of the hub are both 88~95°.

[0006] As described above, in the double-layer fan blade configuration, the ratio of the maximum to the minimum value of the inner fan blade width L1 is between 2:2.8 and 2:3.2, the ratio of the maximum to the minimum value of the outer fan blade width L2 is between 2:2.8 and 2:3.2, and the ratio of the maximum value of the inner fan blade width L1 to the maximum value of the outer fan blade width L2 is between 1:0.99 and 1:1.01.

[0007] As described above, in a plane projection perpendicular to the axis, the inner fan blades are arranged in a relatively radially symmetrical manner, and the outer fan blades are arranged in a relatively radially symmetrical manner.

[0008] As described above, the double-layered fan blade has a first blade root and a first blade tip, and the outer fan blade has a second blade root and a second blade tip. The outer fan blade adopts a linear torsion design from the second blade root with a pitch angle β1 of 28-33° to the second blade tip with a pitch angle β2 of 15-20°, and the inner fan blade adopts a linear torsion design from the first blade root with a pitch angle γ1 of 28-33° to the first blade tip with a pitch angle γ2 of 15-20°.

[0009] As described above, the ratio of the straight-line distance L3 between the blade roots of two adjacent inner blades to the straight-line distance L4 between the blade roots of two adjacent outer blades is 1:3.

[0010] As described above, the double-layered fan blades have multiple inner fan blades and multiple outer fan blades arranged alternately in the circumferential direction.

[0011] As described above, the double-layer fan blades have reinforcing ribs on the inner side of the hub.

[0012] As described above, the inner and outer blades have a constant radial thickness.

[0013] Vehicle ventilation fan, including the double-layered fan blades as described above.

[0014] Compared with existing technologies, the beneficial effects of this technical solution are as follows:

[0015] With the structure of this utility model, when a user needs to ventilate while driving a motorhome, the switch can be controlled to make the double-layer fan blades rotate forward or backward. When the double-layer fan blades rotate forward, fresh air from outside the motorhome can be delivered to the interior of the motorhome. When the double-layer fan blades rotate backward, air from inside the motorhome can be blown to the outside of the motorhome, achieving bidirectional ventilation and providing a better user experience.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a frontal perspective view of the present invention.

[0019] Figure 2 This is a front view of the present invention;

[0020] Figure 3 yes Figure 2 Schematic diagram of section AA and blade tilt angle;

[0021] Figure 4 This is a top view of the present invention;

[0022] Figure 5 yes Figure 4 An enlarged schematic diagram of the blade tip pitch angle of the outer fan blade in the A-section view;

[0023] Figure 6 yes Figure 4 An enlarged schematic diagram of the blade root pitch angle of the outer fan blade in the A-section view;

[0024] Figure 7 This is a perspective view of the rear structure of this utility model;

[0025] Figure 8 yes Figure 7 An enlarged schematic diagram of the blade tip pitch angle of the inner fan blade in the B-section view;

[0026] Figure 9 yes Figure 7 An enlarged schematic diagram of the blade root pitch angle of the inner fan blade in the C-section view. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] When ordinal numbers such as "first" and "second" are mentioned in the embodiments of this application, unless they actually express the meaning of order according to the context, they should be understood as being used only for distinction.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] Example: Figures 1 to 9The double-layer fan blades shown are used to install on a vehicle ventilation fan. The double-layer fan blades include a hub 1, a middle ring 2 coaxially arranged with the hub 1 and located on the outside of the hub 1, a plurality of inner fan blades 3 distributed circumferentially along the outer periphery of the hub 1, and a plurality of outer fan blades 4 distributed circumferentially along the outer periphery of the middle ring 2. The inner fan blades 3 are connected to the inner side of the middle ring 2. In the plane projection perpendicular to the axis, the blade width L1 of the inner fan blades 3 gradually widens radially from the inside to the outside, and the blade width L2 of the outer fan blades 4 gradually narrows radially from the inside to the outside. The tilt angle α1 of the inner fan blades 3 relative to the central axis of the hub 1 and the tilt angle α2 of the outer fan blades 4 relative to the central axis of the hub 1 are both 88~95°. With the structure of this utility model, when a user needs to ventilate while driving a motorhome, the switch can be controlled to make the double-layer fan blades rotate forward or backward. When the double-layer fan blades rotate forward, fresh air from outside the motorhome can be delivered to the interior of the motorhome. When the double-layer fan blades rotate backward, air from inside the motorhome can be blown to the outside of the motorhome, achieving bidirectional ventilation and providing a better user experience.

[0031] Preferably, the inclination angle α1 of the inner fan blade 3 relative to the central axis of the hub 1 is 94° and the inclination angle α2 of the outer fan blade 4 relative to the central axis of the hub 1 is 92°.

[0032] Further, the ratio of the maximum to minimum width L1 of the inner fan blade 3 is between 2:2.8 and 2:3.2, the ratio of the maximum to minimum width L2 of the outer fan blade 4 is between 2:3 and 2:3.5, and the ratio of the maximum value of the inner fan blade 3 width L1 to the maximum value of the outer fan blade 4 width L2 is between 1:0.99 and 1:1.01. Preferably, the ratio of the maximum to minimum width L1 of the inner fan blade 3 is 2:3.1, the ratio of the maximum to minimum width L2 of the outer fan blade 4 is 2:3.3, and the ratio of the maximum value of the inner fan blade 3 width L1 to the maximum value of the outer fan blade 4 width L2 is 1:1.

[0033] Furthermore, in the projection diagram obtained by projecting onto a plane perpendicular to the axis, the inner fan blade 3, whose blade width L1 gradually widens radially from the inside to the outside, can reduce the separation of airflow at the end of the inner fan blade 3 by the gradual increase in width from the first blade root 31 to the first blade tip 32, thereby reducing vortex noise. In addition, the increased width of the first blade tip 32 region can push more air, which can form a high-pressure concentrated air supply zone in the middle, improving airflow continuity and wind pressure.

[0034] Furthermore, in the projection diagram obtained by projecting onto a plane perpendicular to the axis, the outer fan blade 4, whose blade width L2 gradually narrows from the inside to the outside in the radial direction, has a wide second blade root 41 that can more efficiently capture the intake airflow, and a narrow second blade tip 42 that reduces turbulence, making the airflow more axially concentrated and optimizing the airflow guidance.

[0035] Furthermore, in a plane projection perpendicular to the axis, the inner fan blade 3 is arranged in a relatively radially symmetrical shape, and the outer fan blade 4 is also arranged in a relatively radially symmetrical shape. The symmetrical blades allow air to be discharged in both forward and reverse rotation.

[0036] Furthermore, both the inner blade 3 and the outer blade 4 are provided with a blade root 5 and a blade tip 6. The outer blade 4 adopts a linear twist design from the blade root 5 with a pitch angle β1 of 28-33° to the blade tip 6 with a pitch angle β2 of 15-20°, and the inner blade 3 adopts a linear twist design from the blade root 5 with a pitch angle γ1 of 28-33° to the blade tip 6 with a pitch angle γ2 of 15-20°. Preferably, the outer blade 4 adopts a linear twist design from the second blade root 41 with a pitch angle β1 of 32° to the second blade tip 42 with a pitch angle β2 of 16°, and the inner blade 3 adopts a linear twist design from the first blade root 31 with a pitch angle γ1 of 29° to the first blade tip 32 with a pitch angle γ2 of 18°. The torsion design avoids premature airflow separation between the first blade tip 32 and the second blade tip 42 due to high speed, and can disperse centrifugal force and aerodynamic load, avoid stress concentration between the first blade root 31 and the second blade root 41, and efficiently adapt to the airflow characteristics at different radii, thereby improving overall efficiency, reducing noise and enhancing stability.

[0037] Furthermore, the ratio of the straight-line distance L3 between the blade roots of two adjacent inner fan blades 3 to the straight-line distance L4 between the blade roots of two adjacent outer fan blades 4 is 1:3. During clockwise rotation, the narrow gap of the inner fan blades 3 can provide high-pressure directional airflow, while the outer fan blades 4 can provide a wide-range auxiliary airflow. During counterclockwise rotation, the narrow gap of the inner fan blades 3 can prevent reverse airflow leakage and maintain the basic flow rate, while the outer fan blades 4 can form a wide-range airflow for ventilation.

[0038] Furthermore, the plurality of inner fan blades 3 and the plurality of outer fan blades 4 are staggered along the circumference. The structure is simple, but the wind pressure is concentrated.

[0039] Furthermore, the inner side of the hub 1 is provided with reinforcing ribs 11. The hub 1 is also provided with a connecting part 12 at its center. The connecting part 12 is hollow and can be connected to the drive mechanism to drive the entire double-layer fan blade. The reinforcing ribs 11 are evenly distributed along the circumference of the connecting part 12 and correspond one-to-one with the inner fan blades 3, further enhancing the stability of the double-layer fan blade.

[0040] Furthermore, the inner fan blade 3 and the outer fan blade 4 maintain a constant radial thickness. This uniform thickness design simplifies fan blade manufacturing and reduces costs.

[0041] This utility model also provides a vehicle ventilation fan, including the double-layer fan blades as described above.

[0042] The working principle of this embodiment is as follows:

[0043] When users need to ventilate while driving their RV, they can control the switch to make the double-layer fan blades rotate forward or backward. When the double-layer fan blades rotate forward, fresh air from outside the RV can be delivered to the interior of the RV. When the double-layer fan blades rotate backward, air from inside the RV can be blown to the outside of the RV, achieving two-way ventilation and providing users with a better experience.

[0044] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A double-layer fan blade, comprising a hub (1), characterized in that, The device includes a middle ring (2) coaxially arranged with the hub (1) and located outside the hub (1), a plurality of inner fan blades (3) distributed circumferentially along the outer periphery of the hub (1), and a plurality of outer fan blades (4) distributed circumferentially along the outer periphery of the middle ring (2). The inner fan blades (3) are connected to the inner side of the middle ring (2). In the plane projection perpendicular to the axis, the width L1 of the inner fan blades (3) gradually widens from the inside to the outside in the radial direction, and the width L2 of the outer fan blades (4) gradually narrows from the inside to the outside in the radial direction. The tilt angle α1 of the inner fan blades (3) relative to the central axis of the hub (1) and the tilt angle α2 of the outer fan blades (4) relative to the central axis of the hub (1) are both 88~95°.

2. The double-layer fan blade according to claim 1, characterized in that, The ratio of the maximum to the minimum value of the inner fan blade (3) width L1 is between 2:2.8 and 2:3.2, the ratio of the maximum to the minimum value of the outer fan blade (4) width L2 is between 2:2.8 and 2:3.2, and the ratio of the maximum value of the inner fan blade (3) width L1 to the maximum value of the outer fan blade (4) width L2 is between 1:0.99 and 1:1.

01.

3. The double-layer fan blade according to claim 1, characterized in that, In a plane projection perpendicular to the axis, the inner fan blade (3) is arranged in a relatively radially symmetrical manner, and the outer fan blade (4) is arranged in a relatively radially symmetrical manner.

4. The double-layer fan blade according to claim 1, characterized in that, Both the inner fan blade (3) and the outer fan blade (4) are provided with a blade root (5) and a blade tip (6). The outer fan blade (4) adopts a linear torsion design from the blade root (5) with a blade pitch angle β1 of 28-33° to the blade tip (6) with a blade pitch angle β2 of 15-20°. The inner fan blade (3) adopts a linear torsion design from the blade root (5) with a blade pitch angle γ1 of 28-33° to the blade tip (6) with a blade pitch angle γ2 of 15-20°.

5. The double-layer fan blade according to claim 4, characterized in that, The ratio of the straight distance L3 between the blade roots of two adjacent inner blades (3) to the straight distance L4 between the blade roots of two adjacent outer blades (4) is 1:

3.

6. The double-layer fan blade according to claim 1, characterized in that, The plurality of inner fan blades (3) and the plurality of outer fan blades (4) are staggered along the circumferential direction.

7. The double-layer fan blade according to claim 1, characterized in that, The inner side of the hub (1) is provided with reinforcing ribs (11).

8. The double-layer fan blade according to claim 1, characterized in that, The inner fan blade (3) and the outer fan blade (4) have a constant radial thickness.

9. A vehicle-mounted ventilation fan, characterized in that, Includes the double-layered fan blades as described in any one of claims 1-8.

Images