An air supply device assembly

Abstract

This invention discloses an air supply device assembly, including an air duct assembly and an air outlet assembly for generating airflow. The air duct assembly includes a front frame, a middle frame, and a rear frame for forming the air duct. The rear frame forms an air inlet on one side of the middle frame, and the front frame forms an air outlet on the other side of the middle frame. The middle frame is closed around the air duct, and a funnel-shaped air guide portion is formed on the middle frame corresponding to the air inlet. Multiple air guide grooves are formed on the air guide portion in the circumferential direction. The air guide grooves are arranged with respect to the airflow path. The air guide portion and the air guide grooves limit the airflow path in the air duct and constrict the airflow at the air outlet, thereby increasing the air outlet effect.

Description

Technical Field

[0001] This invention relates to the field of fan equipment technology, and more specifically to an air supply device assembly. Background Technology

[0002] Currently, the appearance of traditional household fans has remained largely unchanged for decades. They typically employ a traditional structure consisting of a front grille, a rear grille, and fan blades. The rotating fan blades generate airflow, while the front and rear grilles serve only a protective function. However, as people's living standards improve, they have higher demands for personalized and functional products. They desire visually appealing products, and fans with large airflow, long air distance, and improved indoor air circulation are currently in high demand.

[0003] like Figure 1 As shown, a traditional fan blade assembly includes: a motor, fan blades, a front grille, a rear grille, a retaining ring, a fan blade fixing knob, a motor, a motor bracket, a front cover of the fan head, and a rear cover of the fan head. The rear grille is fitted onto the front cover of the fan head and secured with the retaining ring. The fan blades are mounted on the motor shaft and secured at the front end with the fan blade fixing knob. The front grille is installed in place with the rear grille via a sliding buckle and secured to the rear grille with screws on the lower side. During operation, airflow enters through the rear grille, is accelerated by the fan blades, and then exits through the front grille, forming the airflow process.

[0004] Existing fans have the following technical defects:

[0005] 1. The airflow easily disperses after exiting the front grille, affecting the air delivery distance. The fan blades are prone to resonance during rotation, causing blade wobbling and unstable airflow, thus reducing the fan's air delivery performance. Specific reasons include: existing household fans have fewer blades, smaller airflow volume, lower airflow velocity, and are prone to diffusion;

[0006] 2. The blade's curved surface design is relatively simple. Its leading edge curve, trailing edge curve, blade root curve, and blade tip curve are basically single-arc curves, and the blade thickness is uniform. This type of fan blade outputs low wind speed and has high wind noise during operation.

[0007] 3. The existing fan blade screen has side openings. When air is intake, the airflow enters from both the back and side openings. Air intake at different locations may cause large fan blade vibrations. When air is exhaust, it may cause air volume to be wasted, as the airflow escapes from the side openings.

[0008] 4. The gap between the side of the mesh cover and the fan blades in the existing technology is large. With this structure, the air is diffused after exiting the mesh cover, resulting in a shorter air delivery distance. Summary of the Invention

[0009] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an air supply device assembly that increases the air output effect.

[0010] The above-mentioned technical objective of the present invention is achieved through the following technical solution: an air supply device assembly, including an air duct assembly and an air outlet assembly for generating airflow, the air duct assembly including a front frame, a middle frame and a rear frame for forming the air duct, the rear frame forming an air inlet on one side of the middle frame, the front frame forming an air outlet on the other side of the middle frame, the middle frame enclosing the periphery of the air duct, and the middle frame forming a funnel-shaped air guide portion corresponding to the air inlet, the air guide portion having a plurality of air guide grooves circumferentially opened on the air guide portion, the air guide grooves being arranged with respect to the airflow path, the air guide portion and the air guide grooves defining the airflow path in the air duct and constricting the airflow at the air outlet.

[0011] Furthermore, the air guiding section includes an air inlet section and a pressurizing section. The air inlet section is flared outwards towards the air inlet, and the pressurizing section is connected to the constricted end of the air inlet section and flared outwards towards the air outlet. Through the above improvements, the flared air inlet section creates a Venturi effect, thereby increasing the wind speed.

[0012] Furthermore, the air guide trough includes a first boundary and a second boundary set with respect to the air outlet direction. The first boundary is approximately parallel to the pressurization section and connects to the air inlet section. The second boundary is flared outward toward the air inlet, and the closing part of the second boundary connects to the pressurization section.

[0013] Furthermore, the air guide troughs are arranged at intervals between the air inlet section and the pressurization section, or the air guide troughs are arranged on the pressurization section, or the air guide troughs are arranged on the air inlet section.

[0014] Furthermore, the air guide trough is at least disposed on the radially outer side of the pressurization section to form a first surface air guide surface, and the air inlet section and the surface of the pressurization section form a second surface air guide surface.

[0015] Furthermore, the air outlet assembly includes a hub and a fan blade. A gap of 2 to 10 mm is preset between the outer side of the fan blade and any surface of the middle frame. Through the above improvements, the vibration and noise of the fan blade during rotation can be controlled by adjusting the gap between the fan blade and the middle frame.

[0016] Furthermore, the projection angle of the shear angle of the blade root curve onto the plane containing the hub axis is A, and the included angle A ranges from 35° to 52°.

[0017] The angle of the blade tip curve projected onto the plane containing the hub axis is B, and the included angle B ranges from 11° to 24°.

[0018] Furthermore, the fan blade includes an inlet edge and an outlet edge relative to the airflow direction;

[0019] The air intake edge has a first air intake curve and a second air intake curve arranged sequentially toward the hub. The second air intake curve protrudes from the first air intake curve, and the curvature transitions between the first air intake curve and the second air intake curve.

[0020] The air outlet edge has a first air outlet curve and a second air outlet curve arranged sequentially toward the hub. The first air outlet curve protrudes from the second air outlet curve, and the curvature transitions between the first air outlet curve and the second air outlet curve.

[0021] Furthermore, the first air outlet curve extends out of the hub with respect to the airflow direction, and the air inlet edge is located at the rear of the air outlet edge with respect to the airflow direction.

[0022] Furthermore, the thickness of the fan blades increases towards the center.

[0023] Furthermore, the cross-sectional area of ​​the air guide channel decreases with respect to the air outlet direction, and any cross-section of the air guide channel is arranged in an isosceles trapezoidal shape.

[0024] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. By setting a middle frame between the front frame and the rear frame, the middle frame is closed around the periphery of the air duct, thereby forming a complete annular cavity, reducing the loss of air volume and controlling the diffusion of the airflow path. The Venturi effect is formed by the funnel-shaped air guide part on the middle frame, which accelerates the airflow speed. The airflow is further pressurized and guided and rectified by the air guide groove of the air guide part, giving the airflow output directionality, so that the airflow enters the air duct in an orderly manner along the surface of the middle frame, reducing the wind noise generated by this part of the airflow and reducing resonance, thereby increasing the air delivery distance of the airflow.

[0025] 2. During the air outlet process, the main airflow is formed by the direct rotation of the fan blades. The air is then drawn in after negative pressure is generated at the air inlet due to the movement of the main airflow, and a secondary airflow is formed on the surface of the middle frame. The secondary airflow is output along the airflow path, and it mixes with the main airflow in the gap between the fan blades and the pressurizing mesh. Under the guidance of the surface of the middle frame, the mixed airflow is pressurized, accelerated and guided, and ejected from the air outlet of the front mesh.

[0026] 3. By adjusting the shape of the opening of the pressurization section, the airflow shape at the outlet can be adjusted to obtain diffuse, non-diffuse, or focused shapes. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a duct assembly in the prior art;

[0028] Figure 2 This is a schematic diagram of the air supply device assembly of the present invention;

[0029] Figure 3 This is a structural schematic diagram of the air supply device assembly of the present invention from another angle;

[0030] Figure 4 This is a cross-sectional view of the present invention;

[0031] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0032] Figure 6 This is a top view of the fan blade of the present invention;

[0033] Figure 7 This is a structural diagram of the fan blade of the present invention;

[0034] Figure 8 This is a schematic diagram of the structure of the middle frame of the present invention;

[0035] Figure 9 This is an exploded view of the present invention;

[0036] Figure 10 This is a cross-sectional schematic diagram of the air guide channel of the present invention;

[0037] Figure 11 This is a front view schematic diagram of the present invention;

[0038] Figure 12 This is a schematic diagram of the fan blades and a portion of the hub of the present invention;

[0039] Figure 13 for Figure 12 Cross-sectional view at point AA;

[0040] Figure 14 for Figure 12 Cross-sectional view at point BB;

[0041] Figure 15 for Figure 12 Cross-sectional view at point C;

[0042] Figure 16 for Figure 12 Cross-sectional view at point DD;

[0043] Figure 17 A schematic diagram of the wind shear angle B at the blade tip;

[0044] Figure 18 A schematic diagram of the wind shear angle A at the leaf root;

[0045] In the diagram: 1. Front frame; 2. Middle frame; 3. Rear frame; 4. Air inlet; 5. Air outlet;

[0046] 6. Air guiding components; 6.1 Air inlet section; 6.2 Pressurization section; 6.3 Third boundary;

[0047] 7. Air guide slot; 7.1. First boundary; 7.2. Second boundary;

[0048] 8. Wheel hub;

[0049] 9. Fan blades; 9.1. Inlet edge; 9.11. First inlet curve; 9.12. Second inlet curve;

[0050] 9.2, Air outlet edge; 9.21, First air outlet curve; 9.22, Second air outlet curve;

[0051] 9.3 Leaf root curve; 9.4 Leaf tip curve; Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] It should be understood that although the terms upper, middle, lower, top, one end, etc., appear in this document to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish the elements from each other for ease of understanding, and are not used to define any directional or sequential restrictions.

[0054] like Figure 1-11 As shown, an air supply device assembly includes an air duct assembly and an air outlet assembly for generating airflow. The air duct assembly includes a front frame 1, a middle frame 2, and a rear frame 3 for forming the air duct. The rear frame 3 forms an air inlet 4 on one side of the middle frame 2, and the front frame 1 forms an air outlet 5 on the other side of the middle frame 2. The middle frame 2 is enclosed around the air duct, thereby forming a complete annular air cavity. The air outlet assembly includes a hub portion 8 located in the middle and a fan blade 9 formed on the hub portion 8. During operation, the fan blade 9 rotates to cut the air, thereby forming an airflow. The annular air cavity forms an airflow path. When the airflow passes through the middle frame 2, it is pressurized, accelerated, and guided, and finally ejected from the air outlet 5 of the front frame 1.

[0055] Optionally, the middle frame 2 may be integrally formed on the peripheral boundary of the rear frame 3.

[0056] As a further embodiment of the middle frame 2, the middle frame 2 has a funnel-shaped air guide portion 6 corresponding to the air inlet 4. The funnel-shaped air guide portion 6 creates a Venturi effect at the air inlet 4, causing the airflow to be accelerated and pressurized after passing through the middle frame 2. In addition, the air guide portion 6 has multiple air guide grooves 7 circumferentially opened. The air guide grooves 7 are arranged with respect to the airflow path and have a certain length with respect to the airflow direction. Thus, the airflow is sorted and guided by the air guide grooves 7, giving the surface airflow of the inner wall of the middle frame 2 a directionality toward the air outlet 5, and the guiding direction is consistent, thereby reducing the diffusion of airflow. At the same time, the regular airflow also reduces wind noise and fan vibration during operation.

[0057] like Figure 5 As shown, specifically, the air guide section 6 includes an air inlet section 6.1 and a pressurization section 6.2. The air inlet section 6.1 is flared outward toward the air inlet 4, and the pressurization section 6.2 connects to the constricted end of the air inlet section 6.1 and is flared outward toward the air outlet 5. The flared air inlet section 6.1 creates a Venturi effect, thereby increasing the wind speed. After passing through the air inlet section 6.1, the airflow is pressurized in the pressurization section 6.2, so that the air guide section 6 and the air guide groove 7 limit the airflow path in the air duct and constrict the airflow at the air outlet 5.

[0058] Optionally, the pressurization section 6.2 also tends to narrow towards the air outlet 5 to further improve the converging and pressurizing effect on the airflow.

[0059] As a further embodiment of the air guide slot 7, the air guide slot 7 includes a first boundary 7.1 and a second boundary 7.2 set with respect to the air outlet direction. A third boundary 6.3, consistent with the air inlet section 6.1, is also present between the air guide slot 7. The first boundary 7.1 and the second boundary 7.2 tend to expand outwards with respect to the third boundary 6.3. The first boundary 7.1 is approximately parallel to the pressurization section 6.2 and connects to the air inlet section 6.1. The second boundary 7.2 is widened towards the air inlet 4, and its narrowing point connects to the pressurization section 6.2. Through these improvements, the second boundary 7.2 further pressurizes the surface airflow, and the first boundary 7.1 and the third boundary 6.3 guide and organize the main airflow and the surface airflow. Both the second boundary 7.2 and the air inlet section 6.1 tend to converge towards the air outlet 5, thereby converging the airflow and preventing airflow diffusion within the duct.

[0060] In this embodiment, the air guide slot 7 is connected from the air inlet section 6.1 to the pressurization section 6.2. The air guide slot 7 interrupts the airflow vortex and reduces the noise of the airflow in this part.

[0061] Preferably, the first boundary 7.1 is nearly parallel to the air inlet section 6.1 and tends to narrow towards the air outlet 5.

[0062] In other embodiments, as a way of arranging the air guide slots 7, the air guide slots 7 are arranged at intervals between the air inlet section 6.1 and the pressurization section 6.2, or the air guide slots 7 are arranged on the pressurization section 6.2, or the air guide slots 7 are arranged on the air inlet section 6.1.

[0063] Specifically, the air guide trough 7 is at least disposed on the radially outer side of the pressurization section 6.2 and forms a first surface air guide surface, and the air inlet section 6.1 and the surface of the pressurization section 6.2 form a second surface air guide surface.

[0064] Specifically, the cross-sectional area of ​​the air guide trough 7 is reduced with respect to the air outlet direction, and any cross-section of the air guide trough 7 is set in an isosceles trapezoid. Through the above improvements, the guiding effect of the air guide trough is further enhanced, so that the air guide trough itself is converging towards the air outlet center, and the airflow can be better gathered.

[0065] Based on the above embodiments, the implementation of the air outlet assembly is further explained. The air outlet assembly includes a hub 8 and a fan blade 9. A gap of 2 to 10 mm is preset between the outer side of the fan blade 9 and any surface of the middle frame 2. Through the above improvements, by adjusting the gap between the fan blade 9 and the middle frame 2, the vibration and noise of the fan blade 9 when rotating can be controlled.

[0066] like Figure 16 and Figure 17 As shown, specifically, the projection angle of the wind shear angle of the blade root curve 9.3 onto the plane where the axis of the hub part 8 is located is A, and the range of the included angle A is 35° to 52°;

[0067] The projection angle of the blade tip curve 9.4 onto the plane containing the axis of the hub portion 8 is B, and the included angle B ranges from 11° to 24°.

[0068] This angle setting makes the blades more gentle towards the tip and more axial towards the root, which helps guide the airflow at the tip and directs it axially towards the root.

[0069] like Figures 6 to 8 As shown, as a further explanation of the fan blade 9, the surface of the fan blade 9 is a curved design, and the fan blade 9 includes an air inlet edge 9.1 and an air outlet edge 9.2 relative to the airflow direction, and the air inlet edge 9.1 is located behind the air outlet edge 9.2 with respect to the airflow direction;

[0070] The air inlet edge 9.1 has a first air inlet curve 9.11 and a second air inlet curve 9.12 arranged sequentially toward the hub portion 8. The second air inlet curve 9.12 protrudes from the first air inlet curve 9.11, and the curvature transitions between the first air inlet curve 9.11 and the second air inlet curve 9.12.

[0071] The air outlet edge 9.2 has a first air outlet curve 9.21 and a second air outlet curve 9.22 arranged sequentially toward the hub portion 8. The first air outlet curve 9.21 protrudes from the second air outlet curve 9.22, and the curvature transitions between the first air outlet curve 9.21 and the second air outlet curve 9.22.

[0072] With the aforementioned fan blade 9, the second air inlet curve 9.12 of the leading edge curve is convex outward, which allows the inner side of the fan blade 9 to cut the air first, thereby reducing the air velocity difference between the inner and outer sides of the fan blade 9. The first air outlet curve 9.21 of the trailing edge curve is convex outward, which allows the airflow to flow out on the outer side of the fan blade 9 after cutting the air, improving the stability of the fan blade 9, reducing the air velocity difference of the outer airflow, and making the airflow output more stable. In addition, this fan blade 9 design makes the air velocity more consistent throughout the entire air outlet area. Better airflow control and wind noise control can be achieved by controlling the gap between the fan blade and the middle frame 2. Better airflow control and wind noise control can also be achieved by controlling the distance between the fan blade and the front grille.

[0073] Specifically, the first air outlet curve 9.21 extends from the hub portion 8 in relation to the airflow direction, further guiding the airflow to gather and restrict the airflow within the expected air outlet area.

[0074] like Figures 12 to 16 As shown, in some other embodiments, along a plane parallel to the axis of rotation, the blade obtains a section A through this plane. Section A intersects with the blade root curve. When section A is located at the blade tip, the intersection point is located on the blade root curve and is close to or coincides with one end in the airflow direction. As the plane moves along the blade tip towards the blade root, the intersection point gradually moves down along the blade root toward the leeward side.

[0075] Optionally, the blade root curve includes a first segment and a second segment along the air outlet direction, and the first segment and the second segment roughly divide the blade root curve equally. As the plane moves along the direction from the blade tip to the blade root, the intersection point moves on the second segment, and the cross section A forms an angle with the blade root curve. This angle remains unchanged. As the plane continues to move along the direction from the blade tip to the blade root, the intersection point moves on the first segment, and the angle decreases as it approaches the blade root. The angle of the cross section A about the axis of rotation becomes smaller.

[0076] The blade arrangement with this profile makes the blade cross section converge from the blade tip toward the blade root along the direction close to the blade root, further increasing the output airflow concentration effect and preventing airflow diffusion.

[0077] Specifically, the thickness of the fan blade 9 is set to increase towards the center, and the thickness of the fan blade 9 decreases towards the air inlet edge 9.1 and the air outlet edge 9.2. By designing the fan blade 9 with a gradual thickness, the strength of the fan blade 9 is increased and the deformation of the fan blade 9 is reduced, thereby increasing the stability and continuity of the airflow output.

[0078] In the above embodiment, the number of fan blades 9 is 11 evenly distributed, thereby increasing the air volume. Under the condition of the same air volume, the rotation speed of the fan blades 9 can be reduced, thereby reducing noise. By increasing the number of fan blades 9, the diameter of the fan blades 9 is smaller than that of the existing fan blades 9. The increase in the number of fan blades 9 reduces the angle between the blades, resulting in high wind cutting efficiency during rotation and a more continuous and natural airflow.

[0079] like Figure 4 and Figure 9 As shown in the above embodiment, as an assembly method for the air duct assembly, the rear frame 3 is positioned with its air inlet 4 and the middle frame 2, and is installed by the buckle of the pressurized middle frame 2 and the rear mesh cover. The middle frame 2 is positioned with the front frame 1 by the guide edge protruding along the axis. The front frame 1 is positioned with the rear frame 3 and the middle frame 2 by the guide structure and then fixed with screws. After the rear frame 3, the middle frame 2 and the front frame 1 are installed, a complete central air duct is formed. A closed interlayer space is formed between the three parts. Airflow enters from the air inlet 4 of the rear frame 3 and is blown out from the air outlet 5 of the front frame 1.

[0080] Specifically, the rear frame 3 has a positioning recess facing the front frame 1, the middle frame 2 has a positioning protrusion on its circumferential surface, the positioning recess is located on the outer side of the axial direction and has a first inclined surface, the positioning protrusion faces the positioning recess and has a second inclined surface, and the positioning protrusion is placed into the positioning groove to realize the positioning of the middle frame 2 and the rear frame 3.

[0081] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An air supply device assembly, characterized in that, The system includes a duct assembly and an air outlet assembly for generating airflow. The duct assembly includes a front frame (1), a middle frame (2), and a rear frame (3) for forming the duct. The rear frame (3) forms an air inlet (4) on one side of the middle frame (2), and the front frame (1) forms an air outlet (5) on the other side of the middle frame (2). The middle frame (2) is closed around the duct, and the middle frame (2) has a funnel-shaped air guide portion (6) corresponding to the air inlet (4). The air guide portion (6) has a plurality of air guide grooves (7) circumferentially arranged on it. The air guide grooves (7) are arranged about the airflow path. The air guide portion (6) and the air guide grooves (7) define the airflow path in the duct and constrict the airflow at the air outlet (5). The air guide section (6) includes an air inlet section (6.1) and a pressurization section (6.2). The air inlet section (6.1) is flared outward toward the air inlet (4), and the pressurization section (6.2) is connected to the constricted end of the air inlet section (6.1) and is flared outward toward the air outlet (5). The air guide duct (7) is connected from the air inlet section to the pressurization section and is arranged at intervals around the perimeter; The air guide groove (7) is at least located on the radial outer side of the pressurization section (6.2) and forms a first surface air guide surface; the air inlet section (6.1) and the surface of the pressurization section (6.2) form a second surface air guide surface. The air guide trough includes a first boundary and a second boundary set with respect to the air outlet direction, and a third boundary between the air guide troughs. The first boundary and the second boundary tend to expand outward with respect to the third boundary. The first boundary is roughly parallel to the pressurization section and connects to the air inlet section, and tends to narrow towards the air outlet. The second boundary is set to expand towards the air inlet, and both the second boundary and the air inlet section tend to narrow towards the air outlet (5). The narrowing point of the second boundary connects to the pressurization section. The cross-sectional area of ​​the air guide trough decreases with respect to the air outlet direction.

2. The air supply device assembly according to claim 1, characterized in that: The air outlet assembly includes a hub (8) and a fan blade (9). A root curve (9.3) is formed between the fan blade (9) and the hub (8). A tip curve (9.4) is formed on the outer side of the fan blade (9). A gap of 2 to 10 mm is preset between the outer side of the fan blade (9) and any surface of the middle frame (2).

3. The air supply device assembly according to claim 2, characterized in that: The angle of the wind shear of the blade root curve (9.3) projected onto the plane containing the axis of the hub (8) is A, and the angle A ranges from 35° to 52°. The angle of the wind shear of the blade tip curve (9.4) projected onto the plane containing the axis of the hub (8) is B, and the angle B ranges from 11° to 24°.

4. The air supply device assembly according to claim 2, characterized in that: The fan blade (9) includes an inlet edge (9.1) and an outlet edge (9.2) relative to the airflow direction; The air intake edge (9.1) has a first air intake curve (9.11) and a second air intake curve (9.12) arranged sequentially toward the hub portion (8). The second air intake curve (9.12) protrudes from the first air intake curve (9.11), and there is a curvature transition between the first air intake curve (9.11) and the second air intake curve (9.12). The air outlet edge (9.2) has a first air outlet curve (9.21) and a second air outlet curve (9.22) arranged sequentially toward the hub portion (8). The first air outlet curve (9.21) protrudes from the second air outlet curve (9.22), and the curvature transitions between the first air outlet curve (9.21) and the second air outlet curve (9.22).

5. The air supply device assembly according to claim 4, characterized in that: The first air outlet curve (9.21) extends out of the hub portion (8) with respect to the airflow direction, and the air inlet edge (9.1) is located behind the air outlet edge (9.2) with respect to the airflow direction.

6. The air supply device assembly according to claim 4, characterized in that: The thickness of the fan blade (9) decreases with respect to the air-cutting direction toward the air inlet edge (9.1) and the air outlet edge (9.2), and the thickness of the fan blade decreases with respect to the rotation plane toward the blade tip curve (9.4).

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