Centrifugal fan unit

Abstract

This disclosure relates to a centrifugal fan device comprising: a stator assembly (1); a rotor assembly (2) integrally constructed by injection molding and comprising a lower platen (21), an upper platen (22), a plurality of blades (23) extending between the lower platen (21) and the upper platen (22), a rotor shaft (24) injection molded on the lower platen (21), and a magnetic ring (25), wherein a magnetic ring (3) rotatable under the drive of the stator assembly (1) is mounted on the inner wall of the magnetic ring (25), wherein the stator assembly (1) is arranged in an internal space (20) defined by the lower platen (21), and wherein the rotor shaft (24) is integrally connected to the lower platen (21), and the upper platen (22) includes at least one glue inlet (220) on the side away from the blades (23).

Description

Technical Field

[0001] This disclosure relates to a centrifugal fan device. Background Technology

[0002] Centrifugal fan units include a motor unit and a rotor unit that rotates under the drive of the motor. In the prior art, the forward-curved multi-bladed rotor and the motor rotor are designed separately. The internal metal inserts of the rotor are connected to the shaft by interference fit or by locking with nuts, which brings the disadvantages of a large number of parts and complicated manufacturing and assembly processes.

[0003] Furthermore, wind turbine units are typically manufactured using injection molding, which may expose them to the risk of shrinkage or deformation during production. Therefore, dynamic balancing of the motor rotor is required during the initial production of the motor unit, and a second dynamic balancing of the entire unit is performed after the motor unit and wind turbine unit are assembled. This ensures the overall dynamic balance requirements are met. However, this process results in numerous dynamic balancing steps and low production efficiency.

[0004] In addition, when the humidity of the centrifugal fan's operating environment is too high, the metal inserts and rotor surface of the impeller unit need to be treated with rust prevention. This results in an additional cost burden.

[0005] Based on the above-mentioned drawbacks, the technical problem to be solved by this disclosure is how to provide a centrifugal fan with lower cost, simpler manufacturing process and longer service life. Utility Model Content

[0006] To address the aforementioned problems and needs, this disclosure proposes a centrifugal fan device, characterized in that the centrifugal fan device comprises: a stator assembly; and a rotor assembly, which is constructed as an integral injection-molded part and includes a lower plate, an upper plate, a plurality of blades extending between the lower plate and the upper plate, a rotor shaft and a magnetic guide ring injection-molded on the lower plate, wherein a magnetic ring rotatable under the drive of the stator assembly is mounted on the inner wall of the magnetic guide ring, wherein the stator assembly is arranged in an internal space defined by the lower plate, and wherein the rotor shaft is integrally connected to the lower plate, and the upper plate includes at least one glue inlet on the side away from the blades.

[0007] According to a preferred embodiment, the lower plate includes at least one top section on the side away from the blade.

[0008] According to a preferred embodiment, the rotor assembly is constructed integrally by insert injection molding.

[0009] According to a preferred embodiment, the magnetic ring and the magnetic conductive ring are press-fitted together.

[0010] According to a preferred embodiment, the stator assembly includes a stator core, a first bearing and a second bearing arranged sequentially along the axial direction for supporting the rotor shaft.

[0011] According to a preferred embodiment, the stator assembly further includes a first bearing chamber for accommodating the first bearing and a second bearing chamber for accommodating the second bearing, wherein the first bearing chamber and / or the second bearing chamber are made of an insulating material.

[0012] According to a preferred embodiment, the first bearing housing is constructed as an injection-molded part made of plastic, and the second bearing housing is made of metal.

[0013] According to a preferred embodiment, the blade is constructed to bend radially.

[0014] According to a preferred embodiment, the inlet installation angle of the blade is 60° to 80°.

[0015] According to a preferred embodiment, the inlet installation angle of the blade is 70°.

[0016] According to a preferred embodiment, the outlet installation angle of the blade is 150° to 175°.

[0017] According to a preferred embodiment, the inlet installation angle of the blade is 167°.

[0018] According to a preferred embodiment, the ratio of the inlet diameter to the outlet diameter of the blade is 0.75:1 to 0.9:1.

[0019] According to a preferred embodiment, the ratio of the inlet diameter to the outlet diameter of the blade is 0.84:1.

[0020] According to a preferred embodiment, the upper plate has an L-shaped cross-section in a sectional view along the axial direction.

[0021] According to a preferred embodiment, the lower plate includes at least a section with a tapered structure surrounding the rotor shaft.

[0022] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings so that the features and advantages of the present disclosure can be readily understood. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments of this disclosure will be briefly described below. The drawings are merely illustrative of some embodiments of this disclosure and are not intended to limit all embodiments of this disclosure to them.

[0024] Figure 1This schematic diagram shows an exploded view of a centrifugal fan device according to one embodiment of the present disclosure;

[0025] Figure 2 Show Figure 1 A cross-sectional view of the centrifugal fan unit shown;

[0026] Figure 3 A perspective view of a rotor assembly according to one embodiment of the present disclosure is shown schematically.

[0027] Figure 4 schematically shown Figure 3 A perspective view of the rotor assembly from another angle;

[0028] Figure 5 schematically shown Figure 3 The cross-sectional view of the rotor assembly and the magnetic ring shown.

[0029] Figure 6 schematically shown Figure 5 A magnified view of a portion of region A shown; and

[0030] Figure 7 A schematic top view of a rotor assembly according to one embodiment of the present disclosure is shown. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0032] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this disclosure may have fewer components, other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0033] Figure 1 A centrifugal fan device 100 according to one embodiment of the present disclosure is illustrated schematically. Figure 2 A schematic cross-sectional view of the centrifugal fan unit 100 in its combined state is shown.

[0034] The centrifugal fan unit 100 mainly includes a stator assembly 1 and a rotor assembly 2.

[0035] In this embodiment, the stator assembly 1 mainly includes a stator core 11 and a bracket for supporting the stator core. The stator core 11 can be composed of laminations made of core materials widely known to those skilled in the art, such as silicon steel sheets. The arrangement and shape of the silicon steel sheets are also known to those skilled in the art and will not be described in detail here.

[0036] Figure 2 and Figure 3 The three-dimensional views of rotor assembly 2 are shown schematically from different angles.

[0037] In this embodiment, the rotor assembly 2 includes a lower disk 21, an upper disk 22, and a plurality of blades 23 extending between the lower disk 21 and the upper disk 22. The end of each blade 23 near the lower disk 21 is connected to the lower disk 21 with its inner edge in a radial direction r, and the end of each blade 23 near the upper disk 22 is connected to the upper disk 22 with its outer edge in a radial direction r. The upper disk 22 is annularly constructed, while the lower disk 21 is generally canister-shaped, thereby defining an internal space 20 facing the stator assembly 1.

[0038] Especially Figure 3 and Figure 5 As shown, viewed radially from the center outwards along r, the lower plate 21 comprises several interconnected sections: a central section 211, a transition section 212, a vertical section 213, and an end section 214.

[0039] The rotor assembly 2 also includes a rotor shaft 24 with a bushing 240. The rotor shaft 24 is fixedly connected to the central section 211 of the lower plate 21 at one end equipped with the bushing 240, wherein the central section 211 extends outward in the axial x direction, that is, in the longitudinal extension direction of the rotor shaft 24, and forms a cavity that can cover the bushing 240.

[0040] In addition, the rotor assembly 2 also includes a magnetic ring 25, which is fixedly connected to the vertical section 213 of the lower plate 21.

[0041] According to this disclosure, the rotor assembly 2 is integrally constructed by injection molding, particularly insert injection molding. For this purpose, firstly, a rotor shaft 24 with a bushing 240 and a magnetic ring 25, both made of metal, are positioned in a mold. Then, plastic is injected into the mold, thereby molding the rotor assembly 2 in one step using insert injection molding. Thus, the rotor shaft 24 with the bushing 240, the magnetic ring 25, the upper plate 21, the lower plate 22, and the blades 23 are integrally connected.

[0042] To optimize the injection molding method for rotor assembly 2 and thereby obtain a better rotor assembly 2, the injection port 220 is located on the side of the upper platen 22 away from the blades 23, and the ejector port 210 is located on the side of the lower platen 21 away from the blades 23. According to this disclosure, both the "injection port" and the "ejector port" are structural parts of the rotor assembly 2 after injection molding, wherein during the injection molding process, injection material is injected into the mold at the location of the injection port; after curing, the ejector port abuts against the ejector pin to facilitate demolding of the molded rotor assembly. Figure 3 As shown, six injection ports 220 are provided, for example, rotationally symmetrically on the side of the upper disk 22 away from the blades 23. Plastic is injected into the mold through the injection ports 220. Therefore, the upper disk 22 of the rotor assembly 2 will not shrink after injection molding, and the rotationally symmetrical indentations are beneficial to the initial impeller imbalance. Conversely, if the injection ports 220 were located on the lower disk 21, there would be a risk of shrinkage cavities at the junction of the upper disk 22 and the blades 23 after molding. Figure 4 As shown, a plurality of ejector portions 210 are provided, for example, on the side of the lower platen 21 away from the blade 23. Thus, after injection molding, the ejector pins apply a pushing force to the molded rotor assembly 2 at these ejector portions 210 to demold the rotor assembly 2 without deforming the blade 23.

[0043] like Figure 6 As shown, in the cross-sectional view of the rotor assembly 2 cut along the axial x-axis, the upper disk 22 has an L-shaped cross-section. The upper disk 22 has a thicker end face section 221 and a circumferential section 222, which are respectively connected to the blade 23 in material bonding via the end face section 221 and the circumferential section 222. This helps to reduce warping deformation of the injection molded part during injection molding and improves the mechanical strength of the upper disk 22.

[0044] The rotor assembly 2 disclosed herein includes integrally formed blades 23 and rotor shaft 24, which ensures the concentricity of the entire rotating body, helps reduce the initial imbalance of the entire rotating body, and effectively improves the efficiency of dynamic balancing tests during production. The vibration of the entire fan is reduced, which helps to reduce the generation of vibration noise, reduce vibration damage to bearings, and extend the service life of bearings. This design not only achieves one-time molding of the rotor assembly, simplifying the process, but also avoids secondary processing. Only one dynamic balancing is required for the rotor assembly 2 with the rotor shaft, eliminating the need for subsequent cumbersome secondary dynamic balancing.

[0045] In addition, metal inserts, such as bushings and magnetic rings, are at least partially encased in plastic injection molding bodies to avoid excessive exposure, which can significantly improve corrosion resistance and extend equipment life.

[0046] The centrifugal fan device also includes a magnetic ring 3 that cooperates with the magnetic guide ring 25. After the rotor assembly 2 is injection molded, the magnetic ring 3 is pressed into the space surrounded by the magnetic guide ring 25, thereby forming a press-fit connection between the magnetic ring 3 and the magnetic guide ring 25.

[0047] In this embodiment, the stator assembly 1 mainly includes a stator core 11 and a bracket for supporting the stator core. The stator core 11 can be composed of laminations made of core materials widely known to those skilled in the art, such as silicon steel sheets. The arrangement and shape of the silicon steel sheets are also known to those skilled in the art and will not be described in detail here.

[0048] The stator assembly 1 also includes a first bearing 12 and a second bearing 13 for supporting the rotor shaft 24. Figure 2 In the illustrated embodiment, the first bearing 12 is arranged axially x above the second bearing 13. Correspondingly, the support includes a first bearing chamber 14 for accommodating the first bearing 12 and a second bearing chamber 15 for accommodating the second bearing 13. The first bearing chamber 14 or the second bearing chamber 15 can be injection molded from plastic. As an electrical insulating material, the plastic bearing chamber effectively eliminates the generation of shaft current, isolates the current loop, and thus avoids damage to the bearing from shaft current, advantageously extending the bearing's service life. For example, in this embodiment, the first bearing chamber 14 is made of plastic, and the second bearing chamber 15 is made of metal, such as cast aluminum. Alternatively or supplementarily, both the first bearing chamber 14 and the second bearing chamber 15 can be injection molded from plastic. Since the second bearing chamber 15 is located axially x below the first bearing chamber 14, it also constitutes a base that externally encloses the stator assembly 1.

[0049] In the assembled state, the stator core 11 of the stator assembly 1 is positioned substantially the same as the magnetic ring 3 and the magnetic guide ring 25 of the rotor assembly 2 in the axial direction x, and is located inside the magnetic ring 3 in the radial direction r. Furthermore, the stator core 11 is located between the first bearing 12 and the second bearing 13.

[0050] When the stator assembly 1 is energized, the rotor shaft 24 rotates under the excitation of the stator core 11, thereby causing the lower plate 21, upper plate 22, and blades 23, which are integrally connected to the rotor shaft 24, to rotate. This enables the operation of the centrifugal fan device. During operation, ambient air enters from the center position above the upper plate 22 along the axial direction x and exits from the outer peripheral surface of the blades 23 along the radial direction r from the inside to the outside.

[0051] To achieve good hydrodynamic properties, in a preferred embodiment, the blade 23 is constructed to bend radially r. Figure 7In the exemplary embodiment shown, the rotor assembly 2 includes 44 blades 23. As known to those skilled in the art, the angle between the tangent of the airfoil line at the inlet and the circumferential direction is defined as the inlet mounting angle of the blade, and the angle between the tangent of the airfoil line at the outlet and the circumferential direction is defined as the outlet mounting angle of the blade. In this embodiment, the inlet mounting angle β1 of each blade 23 is 60° to 80°, preferably 70°. The outlet mounting angle β2 of each blade 23 is 150° to 175°, preferably 167°. Furthermore, the diameter of the circle defined by the inner edge of the blade 23, i.e., its inlet, is defined as the inlet diameter D1 of the blade, and the diameter of the circle defined by the outer edge of the blade 23, i.e., its outlet, is defined as the outlet diameter D2 of the blade. In this embodiment, the ratio of the inlet diameter to the outlet diameter of the blade 23 is 0.75:1 to 0.9:1, preferably 0.84:1.

[0052] The transition section 212 of the lower plate 21 is frustoconical in shape, thus forming a cone-shaped rotor head profile together with the central section 211 and the vertical section 213. This reduces obstruction of the air inlet of the centrifugal fan blades, facilitating air intake and increasing air volume. Furthermore, it reduces vortices generated by airflow rotation inside the blades, lowering the noise of the centrifugal fan and improving its efficiency.

[0053] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms “first,” “second,” and similar terms used in this utility model patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “an” or “a” and similar terms do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0054] The exemplary embodiments of the present invention have been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the concept of the present invention, and various combinations can be made to the various technical features and structures proposed by the present invention without exceeding the protection scope of the present invention, which is determined by the appended claims.

Claims

1. A centrifugal fan device, characterized in that, The centrifugal fan device includes: Stator assembly (1); The rotor assembly (2) is constructed as a one-piece injection molded part and includes a lower platen (21), an upper platen (22), a plurality of blades (23) extending between the lower platen (21) and the upper platen (22), a rotor shaft (24) injection molded on the lower platen (21), and a magnetic ring (25), on the inner wall of the magnetic ring (25) being a rotatable magnetic ring (3) driven by the stator assembly (1). The stator assembly (1) is arranged in an internal space (20) defined by the lower plate (21), and the rotor shaft (24) is integrally connected to the lower plate (21), and the upper plate (22) includes at least one glue inlet (220) on the side away from the blade (23).

2. The centrifugal fan arrangement of claim 1, wherein The lower plate (21) includes at least one top section (210) on the side away from the blade (23).

3. The centrifugal fan arrangement of claim 1, wherein The rotor assembly (2) is constructed as a single piece by insert injection molding.

4. The centrifugal fan arrangement of claim 1, wherein The magnetic ring (3) is press-fitted with the magnetic guide ring (25).

5. The centrifugal fan arrangement of claim 1, wherein The stator assembly (1) includes a stator core (11), a first bearing (12) and a second bearing (13) arranged axially to support the rotor shaft (24).

6. The centrifugal fan arrangement of claim 5, wherein The stator assembly (1) further includes a first bearing chamber (14) for accommodating the first bearing (12) and a second bearing chamber (15) for accommodating the second bearing (13), wherein the first bearing chamber (14) and / or the second bearing chamber (15) are made of insulating material.

7. The centrifugal fan arrangement of claim 6, wherein The first bearing chamber (14) is constructed as an injection-molded part made of plastic, and the second bearing chamber (15) is made of metal.

8. The centrifugal fan arrangement of claim 1, wherein The blade (23) is constructed to bend radially.

9. The centrifugal fan arrangement of claim 8, wherein The inlet mounting angle (β1) of the blade (23) is 60° to 80°.

10. The centrifugal fan arrangement of claim 9, wherein The inlet mounting angle (β1) of the blade (23) is 70°.

11. The centrifugal fan arrangement of claim 8, wherein The exit installation angle (β2) of the blade (23) is 150° to 175°.

12. The centrifugal fan arrangement of claim 11, wherein, The inlet mounting angle (β2) of the blade (23) is 167°.

13. The centrifugal fan arrangement of claim 8, wherein, The ratio of the inlet diameter to the outlet diameter of the blade (23) is 0.75:1 to 0.9:

1.

14. The centrifugal fan arrangement of claim 13, wherein, The ratio of the inlet diameter to the outlet diameter of the blade (23) is 0.84:

1.

15. The centrifugal fan arrangement of claim 1, wherein, The upper plate (22) has an L-shaped cross section in the axial sectional view.

16. The centrifugal fan arrangement of claim 1, wherein The lower plate (21) includes at least a section (212) of tapered construction surrounding the rotor shaft (24).

Images