Centrifugal fan impeller assembly with adjustable blade mounting angle

Abstract

The utility model discloses a centrifugal fan impeller assembly with an adjustable blade installation angle. The centrifugal fan impeller assembly comprises a first supporting ring, a second supporting ring and a plurality of blades located between the first supporting ring and the second supporting ring. A plurality of same mounting holes are oppositely formed in the first supporting ring and the second supporting ring in parallel, and the two ends of each blade are fixed to the mounting holes of the first supporting ring and the second supporting ring respectively; a plurality of clamping positions are arranged in each mounting hole, and the adjacent clamping positions are separated at least through arc-shaped ribs located at the first ends of the mounting holes; the first sides of the blades abut against the second ends of the mounting positions, and the second sides of the blades cross the arc-shaped protruding edges, are switched between the adjacent clamping positions and abut against the first ends of the mounting holes corresponding to the corresponding clamping positions. Therefore, the adjustability of the mounting angle of the blade is realized. In practical application, the angles of the blades can be flexibly adjusted according to different working requirements and working conditions, so that the effects of optimizing gas flow and improving fan performance under different working conditions are achieved, and the universality of the impeller assembly and corresponding accessories is improved.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal fan technology, and in particular to a centrifugal fan impeller assembly with adjustable blade installation angle. Background Technology

[0002] As a core component of range hoods, the fan impeller rotates at high speed to generate negative pressure, which is crucial for the intake and exhaust of cooking fumes. However, existing technologies have many problems, especially in the areas of blade angle adjustment and support component design.

[0003] Currently, most range hood fan impeller blades have a fixed angle, which cannot be adjusted according to actual operating conditions. This easily leads to vortices and flow separation in the airflow on the blade surface, reducing the fan's aerodynamic efficiency and increasing noise. Furthermore, fixed-angle blades have poor adaptability to different operating conditions, making it difficult to achieve optimal airflow control. In addition, different fans and customer requirements necessitate the manufacture of different support components, resulting in numerous customized designs, increased production costs, and extended development cycles. Incompatibility issues between different support components may also cause a decline in the overall performance of the fan system.

[0004] Existing patent documents also reflect these shortcomings and directions for improvement to some extent. The following is an analysis of relevant patent documents:

[0005] Patent No. CN203463357U, titled "Adjustable Centrifugal Impeller with Adjustable Blade Angle": This patent proposes a centrifugal impeller where the blade angle is adjusted by rotating a disc at one end of the impeller to change performance parameters, making it suitable for different applications. In comparison, while this patent represents some progress in blade angle adjustment, its adjustment structure may be relatively complex, and it primarily targets specific application scenarios for centrifugal impellers. This differs from the application of this utility model in range hood fan impellers, which utilizes multi-position fixing discs and sliding locking mechanisms to achieve adjustable blade angles. This utility model prioritizes adaptability to range hood operating conditions and ease of adjustment.

[0006] Patent No. CN215171037U, entitled "An Impeller for a Centrifugal Fan with Adjustable Blade Angle": This patent provides an impeller for a centrifugal fan with adjustable blade angle. The blades are rotatably connected to a large impeller disk and a small impeller disk, and an blade angle adjustment device is included, allowing the blades to adjust their angle according to wind pressure, reducing the likelihood of blade damage. However, its adjustment device involves multiple components, resulting in a relatively complex structure. Furthermore, it primarily addresses the adaptive adjustment of blades under wind pressure, which differs significantly from the multi-position fixed disc combined with a sliding locking mechanism used in this invention to achieve multi-position adjustment. This invention, while achieving angle adjustment, emphasizes advantages such as multi-position adaptability to different operating conditions and simplified support component design.

[0007] In summary, existing technologies suffer from significant drawbacks, including difficulties in blade angle adjustment, complex adjustable structures, and poor versatility of support components. These issues limit the optimization of fan performance and the improvement of production efficiency. Therefore, this invention proposes an angle-adjustable impeller assembly to address these problems. It provides a technical solution for range hood fan impellers that offers multi-level blade angle adjustment, convenient adjustment, and good versatility of support components, thereby better adapting to different operating conditions, improving fan performance, and reducing production costs. Utility Model Content

[0008] The technical problem to be solved by this utility model is to provide a more versatile impeller assembly and centrifugal fan with adjustable blade mounting that can better adapt to working conditions.

[0009] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a centrifugal fan impeller assembly with adjustable blade installation angle, including a first support ring, a second support ring and a plurality of blades located between the two;

[0010] The first support ring and the second support ring are provided with a plurality of identical mounting holes parallel to each other and opposite to each other, and the two ends of the blade are respectively fixed on the mounting holes of the first support ring and the second support ring.

[0011] Each mounting hole has multiple snap-fit ​​positions, and adjacent snap-fit ​​positions are separated by at least one arc-shaped protrusion located at the first end of the mounting hole;

[0012] The first side of the blade abuts against the second end of the mounting position, and the second side of the blade crosses the arc-shaped protrusion to switch between adjacent snap-fit ​​positions and abuts against the first end of the mounting hole corresponding to the snap-fit ​​position.

[0013] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problem is as follows: the second end of the mounting hole is provided with multiple spaced arc-shaped protrusions, and the adjacent snap-fit ​​positions pass through the arc-shaped protrusions at the first end of the mounting hole and

[0014] The second end of the mounting hole is separated by an arc-shaped protrusion.

[0015] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is: the height H of the arc-shaped convex ridge and the thickness t of the blade side satisfy: 0.3t≤H≤0.6t.

[0016] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is that the inner wall of the end of the mounting hole between adjacent arc-shaped protrusions is serrated.

[0017] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is: the arc-shaped convex ridge cross section has an asymmetrical structure.

[0018] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the end of the blade is provided with a buckle formed by bending, and the inner surface of the buckle is tightly against the outer surface of the corresponding support ring.

[0019] Another technical solution adopted by this utility model to solve the above-mentioned technical problems is: a centrifugal fan impeller assembly with adjustable blade installation angle, including a first support ring, a second support ring and a plurality of blades located between the two;

[0020] The first support ring and the second support ring are provided with a plurality of identical mounting holes parallel to each other and opposite to each other, and the two ends of the blade are respectively fixed on the mounting holes of the first support ring and the second support ring.

[0021] Each mounting hole has multiple snap-fit ​​positions, and adjacent snap-fit ​​positions are separated by an arc-shaped protrusion located at the outer end of the mounting hole;

[0022] The air inlet side of the blade rests against the inner end of the mounting position, while the air outlet side of the blade crosses the arc-shaped protrusion and switches between adjacent snap-fit ​​positions, resting against the outer end of the mounting hole corresponding to the snap-fit ​​position.

[0023] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problem is as follows: the arc-shaped convex ridge includes a first ridge surface on the same side as the concave suction surface of the blade and a second ridge surface on the same side as the convex pressure surface of the blade, wherein the radius of curvature of the first ridge surface is greater than the radius of curvature of the second ridge surface.

[0024] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is: the height H of the arc-shaped convex ridge and the thickness t of the blade side satisfy: 0.3t≤H≤0.6t.

[0025] Another technical solution adopted by this utility model to solve the above-mentioned technical problems is: a centrifugal fan impeller assembly with adjustable blade installation angle, including a first support ring, a second support ring and a plurality of blades located between the two;

[0026] The first support ring and the second support ring are provided with a plurality of identical mounting holes parallel to each other and opposite to each other, and the two ends of the blade are respectively fixed on the mounting holes of the first support ring and the second support ring.

[0027] Each mounting hole is equipped with multiple snap-fit ​​positions, and adjacent snap-fit ​​positions are separated by an arc-shaped protrusion located at the first and second ends of the mounting hole.

[0028] The two ends of the blade cross the arc-shaped protrusion and switch between adjacent snap-fit ​​positions. The first side of the blade abuts against the first end of the mounting hole corresponding to the snap-fit ​​position, and the second side of the blade abuts against the second end of the mounting hole corresponding to the snap-fit ​​position.

[0029] The arc-shaped convex ridge has an asymmetrical structure, including a first ridge on the same side as the concave suction surface of the blade and a second ridge on the same side as the convex pressure surface of the blade.

[0030] The radius of curvature of the first facet of the arc-shaped protrusion located at the first end of the mounting hole is greater than the radius of curvature of the second facet, and the radius of curvature of the first facet of the arc-shaped protrusion located at the second end of the mounting hole is less than the radius of curvature of the second facet.

[0031] Compared with the prior art, the advantages of this utility model are: Attached Figure Description

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0033] Figure 1 This is a three-dimensional structural diagram of an impeller assembly with an adjustable blade mounting angle according to Embodiment 1;

[0034] Figure 2 This is an exploded view of an impeller assembly with an adjustable blade mounting angle according to Embodiment 1.

[0035] Figure 3 The three-dimensional structure of the support ring of an impeller assembly with adjustable blade mounting angle as described in Embodiment 1. Figure 1 ;

[0036] Figure 4 for Figure 2 A partially enlarged view of an impeller assembly with adjustable blade mounting angle;

[0037] Figure 5 for Figure 3 A partially enlarged view of an impeller assembly with adjustable blade mounting angle;

[0038] Figure 6 This is a three-dimensional structural diagram of an impeller assembly with an adjustable blade mounting angle according to Embodiment 2;

[0039] Figure 7 This is an exploded view of an impeller assembly with an adjustable blade mounting angle according to Embodiment 2;

[0040] Figure 8 for Figure 7 A partially enlarged view of an impeller assembly with adjustable blade mounting angle. Detailed Implementation

[0041] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0042] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it will not be further defined and explained in subsequent figures.

[0043] In the description of this utility model, it should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the usual placement of the product during use. These may differ from the orientations in the accompanying drawings. They are used solely for the purpose of describing the utility model from the same reference and for simplification, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Similarly, "first" and "second" are used only for ease of understanding and have no other directional meaning; they should not be considered as limitations on this utility model.

[0044] Example 1:

[0045] like Figure 1-5 This embodiment illustrates an impeller assembly with adjustable blade mounting angle, mainly comprising a first support ring 1, a second support ring 2, and multiple blades 3 located between them. The first support ring 1 and the second support ring 2 are parallel to each other, and multiple identical mounting holes 4 are correspondingly provided on them. The two ends of the blades 3 are respectively fixed in these mounting holes 4. Each mounting hole 4 is provided with multiple locking positions.

[0046] like Figure 3-5 As shown, in this embodiment, adjacent snap-fit ​​positions are separated by an arc-shaped protrusion 5 located at the first end 41 of the mounting hole 4. The first side of the blade 3 abuts tightly against the second end 42 of the mounting hole 4, while the second side of the blade 3 can pass over the arc-shaped protrusion 5 to achieve switching between adjacent snap-fit ​​positions, and after switching, abuts against the first end 41 of the mounting hole 4 corresponding to the corresponding snap-fit ​​position.

[0047] By setting multiple snap-fit ​​positions within the mounting hole 4 and using arc-shaped protrusions 5 for separation, the blade 3 can abut against different snap-fit ​​positions, thus achieving adjustable installation angle of the blade 3. In practical applications, the angle of the blade 3 can be flexibly adjusted according to different working requirements and conditions to optimize gas flow and improve fan performance under different operating conditions.

[0048] In this embodiment, the arc-shaped protrusion 5 not only serves to separate different locking positions, but also provides guidance and limitation for the movement of the blade 3. When the blade 3 switches positions within the mounting hole 4, the arc-shaped protrusion 5 can guide the blade 3 to smoothly transition to the next locking position, and after the blade 3 reaches the target position, it restricts further movement of the blade 3, ensuring that the blade 3 remains stable during operation.

[0049] The height H of the arc-shaped ridge 5 and the thickness t of the side of the blade 3 satisfy the condition: 0.3t ≤ H ≤ 0.6t. Under these conditions, the blade 3 can easily pass over the arc-shaped ridge 5 with an appropriate force to achieve angle switching, and can still stably maintain the corresponding position when rotating at high speed after switching.

[0050] like Figure 4-5 As shown, the cross-section of the arc-shaped convex ridge 5 has an asymmetrical structure. The radius of curvature of the first ridge surface 51 on the same side as the concave suction surface of the blade 3 is smaller than the radius of curvature of the second ridge surface 52 on the same side as the convex pressure surface of the blade 3. Since the blade 3 itself is curved, it is easily bent in the same direction as its own curvature during the switching process. Therefore, the larger radius of curvature of the first ridge surface 51 on the same side as the concave suction surface of the blade 3 makes it easier for the blade 3 to switch angles in this direction, and after switching, it is blocked by the smaller radius of the second ridge surface 52, which is not easily overcome. Of course, when the force is increased, the second ridge surface 52 can also be overcome.

[0051] like Figure 1-3 As shown, the end of blade 3 is provided with a bent fastening portion 6, the inner surface of which is tightly pressed against the outer surface of the corresponding support ring. This design enhances the tightness of the connection between blade 3 and support ring, improving the overall stability of the impeller assembly. At the same time, the design of the fastening portion 6 also increases the rigidity of the end of blade 3, enabling it to remain stable during high-speed rotation and reducing the vibration and deformation of blade 3.

[0052] Preferably, the inner wall of the end of the mounting hole 4 between adjacent arc-shaped protrusions 5 is serrated. This serrated structure can tightly engage with the side of the blade 3 after the blade 3 is installed, preventing the blade 3 from sliding due to inertia or airflow impact during operation, ensuring the stability and accuracy of the blade 3 angle, and thus ensuring the stable performance of the fan.

[0053] Example 2:

[0054] like Figure 6-8In this embodiment, the impeller assembly with adjustable blade mounting angle consists of a first support ring 1, a second support ring 2, and multiple blades 3. The first support ring 1 and the second support ring 2 are parallel to each other and have multiple identical mounting holes 4. The two ends of the blades 3 are respectively fixed in these mounting holes 4. Each mounting hole 4 has multiple locking positions, and adjacent locking positions are separated by arc-shaped protrusions 5 located at intervals at the first end 41 and the second end 42 of the mounting hole 4. The two ends of the blades 3 can pass over the corresponding arc-shaped protrusions 5 to switch between adjacent locking positions. The first side of the blade 3 abuts against the first end 41 of the mounting hole 4 corresponding to the locking position, and the second side of the blade 3 abuts against the second end 42 of the mounting hole 4 corresponding to the locking position. The mounting hole 4 is narrowed in the middle and widened at both ends, with the middle part serving to fix the blades 3.

[0055] like Figure 8 As shown, the cross-section of the arc-shaped protrusion 5 has an asymmetrical structure. The radius of curvature of the first facet 51 of the arc-shaped protrusion 5 located at the first end 41 of the mounting hole 4 (on the same side as the concave suction surface of the blade 3) is greater than the radius of curvature of the second facet 52 (on the same side as the convex pressure surface of the blade 3); while the radius of curvature of the first facet 51 of the arc-shaped protrusion 5 located at the second end 42 of the mounting hole 4 is smaller than the radius of curvature of the second facet 52.

[0056] Compared to Embodiment 1, this embodiment features arc-shaped protrusions 5 at both ends of the mounting hole 4, enabling the blade 3 to switch and position in both directions, thus providing a more precise blade 3 angle adjustment capability. This allows the impeller assembly to adapt more accurately to different working conditions, meeting higher precision airflow control requirements and further improving the performance and adaptability of the fan. The synergistic effect of the arc-shaped protrusions 5 at both ends provides more stable support and restraint for the blade 3. During the operation of the blade 3, whether impacted by airflow from the suction surface or the pressure surface, the arc-shaped protrusions 5 at both ends effectively restrict the position of the blade 3, preventing excessive deformation or displacement of the blade 3, ensuring the stable operation of the impeller assembly, and extending its service life.

[0057] In this embodiment, the relationship between the height H of the arc-shaped ridge 5 and the side thickness t of the blade 3 still satisfies 0.3t ≤ H ≤ 0.6t. This height range design ensures that the arc-shaped ridge 5 has sufficient strength to withstand the various forces acting on the blade 3 during operation, while preventing the ridge from being too high and affecting the installation and switching operation of the blade 3. At the same time, a moderate ridge height also helps to reduce the amount of material used, thereby reducing the weight and cost of the impeller assembly.

[0058] This invention introduces a centrifugal fan impeller assembly with adjustable blade installation angle. Specific examples are used to illustrate the principle and implementation of this invention. The descriptions of the embodiments are merely for the purpose of helping to understand this invention and its core ideas. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A centrifugal fan impeller assembly with adjustable blade angle, characterized by The first support ring, the second support ring and the plurality of vanes located between the two; The first support ring and the second support ring are provided with a plurality of identical mounting holes in parallel and oppositely, and the two ends of the vanes are fixed on the mounting holes of the first support ring and the second support ring respectively; A plurality of clamping positions are arranged in each mounting hole, and adjacent clamping positions are separated by an arc-shaped protrusion located at the first end of the mounting hole; The first side of the vane abuts against the second end of the mounting position, and the second side of the vane switches between adjacent clamping positions and abuts against the first end of the mounting hole corresponding to the corresponding clamping position by crossing the arc-shaped protrusion.

2. A centrifugal fan impeller assembly with adjustable blade angle according to claim 1, characterized in that The second end of the mounting hole is provided with a plurality of arc-shaped protrusions at intervals, and adjacent clamping positions are separated by the arc-shaped protrusions at the first end of the mounting hole and the corresponding arc-shaped protrusions at the second end of the mounting hole.

3. A centrifugal fan impeller assembly with adjustable blade angle according to claim 1, characterized in that The height H of the arc-shaped protrusion and the thickness t of the side of the vane satisfy: 0.3t≤H≤0.6t.

4. A centrifugal fan impeller assembly with adjustable blade angle according to claim 1, characterized in that The inner wall of the end of the mounting hole between adjacent arc-shaped protrusions is serrated.

5. A centrifugal fan impeller assembly with adjustable blade angle according to claim 1, characterized in that The cross section of the arc-shaped protrusion is asymmetric.

6. A blade pitch adjustable centrifugal fan impeller assembly according to claim 1, wherein The end of the vane is provided with a buckle formed by bending, and the inner surface of the buckle abuts against the outer surface of the corresponding support ring.

7. A centrifugal fan impeller assembly with adjustable blade pitch, characterized by The first support ring, the second support ring and the plurality of vanes located between the two; The first support ring and the second support ring are provided with a plurality of identical mounting holes in parallel and oppositely, and the two ends of the vanes are fixed on the mounting holes of the first support ring and the second support ring respectively; A plurality of clamping positions are arranged in each mounting hole, and adjacent clamping positions are separated by an arc-shaped protrusion located at the first end of the mounting hole; The first side of the vane abuts against the second end of the mounting position, and the second side of the vane switches between adjacent clamping positions and abuts against the first end of the mounting hole corresponding to the corresponding clamping position by crossing the arc-shaped protrusion.

8. A blade pitch adjustable centrifugal fan impeller assembly according to claim 7, wherein The arc-shaped protrusion includes a first edge surface on the same side as the suction surface of the vane and a second edge surface on the same side as the pressure surface of the vane, and the curvature radius of the first edge surface is greater than that of the second edge surface.

9. A blade pitch adjustable centrifugal fan impeller assembly according to claim 8, wherein The height H of the arc-shaped protrusion and the thickness t of the side of the vane satisfy: 0.3t≤H≤0.6t.

10. A centrifugal fan impeller assembly with adjustable blade pitch, characterized by The first support ring, the second support ring and the plurality of vanes located between the two; The first support ring and the second support ring are provided with a plurality of identical mounting holes in parallel and oppositely, and the two ends of the vanes are fixed on the mounting holes of the first support ring and the second support ring respectively; A plurality of clamping positions are arranged in each mounting hole, and adjacent clamping positions are separated by an arc-shaped protrusion located at the first end and the second end of the mounting hole at intervals; The two ends of the vane switch between adjacent clamping positions by crossing the arc-shaped protrusion, the first side of the vane abuts against the first end of the mounting hole corresponding to the corresponding clamping position, and the second side of the vane abuts against the second end of the mounting hole corresponding to the corresponding clamping position; The cross section of the arc-shaped protrusion is asymmetric, including a first edge surface on the same side as the suction surface of the vane and a second edge surface on the same side as the pressure surface of the vane; The curvature radius of the first edge surface of the arc-shaped protrusion located at the first end of the mounting hole is greater than that of the second edge surface, and the curvature radius of the first edge surface of the arc-shaped protrusion located at the second end of the mounting hole is less than that of the second edge surface.

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