Impeller assembly and fan

Abstract

The utility model provides a kind of impeller assembly and fan, it is related to kitchen appliance technical field, the utility model provides impeller assembly including impeller middle disc and fairing;Fairing is connected with impeller middle disc and is located the side of impeller middle disc away from motor, fairing has the outer circumferential surface being arranged around the axis of impeller middle disc;With the axis of impeller middle disc the plane where it is located cuts outer circumferential surface, cutting surface has relatively arranged track line at corresponding outer circumferential surface, track line is curve, the vertical distance between each point on curve and the axis of impeller middle disc satisfies: in the direction gradually close to impeller middle disc, vertical distance gradually increases.The utility model provides impeller assembly can make that airflow is more uniform in axial flow velocity, guarantee the performance of fan.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to an impeller assembly and a fan. Background Technology

[0002] Currently, most range hoods on the market use forward-curved multi-blade centrifugal fans as their core smoke exhaust components. These fans deliver airflow through forward-curved multi-blade impellers. Their working principle is as follows: airflow enters axially from the impeller, and under the action of impeller rotation, it changes from axial to radial flow out along the blade channels, thus creating a negative pressure area to achieve the purpose of drawing in cooking fumes.

[0003] In traditional designs, the lack of effective flow control means during the axial entry and radial exit of airflow inside the impeller can easily lead to uneven axial airflow distribution, resulting in some areas having excessively high flow velocities and others having excessively low flow velocities, thus affecting the performance of the fan. Utility Model Content

[0004] The purpose of this invention is to provide an impeller assembly and a fan that can make the airflow velocity more uniform in the axial direction, thus ensuring the performance of the fan. Additionally, a fan including the aforementioned impeller assembly is provided.

[0005] To achieve the above objectives, this utility model provides the following technical solution: In a first aspect, this utility model provides an impeller assembly, including an impeller disk and a fairing; The fairing is connected to the impeller disk and is located on the side of the impeller disk away from the motor. The fairing has an outer peripheral surface arranged around the axis of the impeller disk. The outer peripheral surface is cut off by the plane where the axis of the impeller disk is located. The cut surface has a trajectory line that is relatively set on the outer peripheral surface. The trajectory line is curved. The vertical distance between each point on the curve and the axis of the impeller disk satisfies the following condition: the vertical distance gradually increases as it gets closer to the impeller disk.

[0006] In an optional implementation, the shape of the curve extension path satisfies the following formula: S=h*[δ / δ0-sin(2πδ / δ0) / (2π)]; Where: h is the radial distance between the two ends of the curve in the axial direction; δ0 is the axial distance between the two ends of the curve in the axial direction; δ is the axial distance between any point on the curve and the end of the curve away from the impeller disk; S is the radial distance between the arbitrary point on the curve and the end of the curve away from the impeller disk.

[0007] In an optional embodiment, the fairing includes an end plate and an outer peripheral plate, one end of the outer peripheral plate is connected to the end plate, and the other end is connected to the impeller disk, and the outer peripheral plate has the outer peripheral surface.

[0008] In an optional embodiment, the outer peripheral plate is snapped into the impeller disk, and / or, a fastener is provided between the outer peripheral plate and the impeller disk to lock their positions.

[0009] In an optional embodiment, the outer ring of the impeller disk is provided with a connecting portion, and the thickness of the connecting portion gradually decreases along the direction gradually away from the axis of the impeller disk.

[0010] In an optional embodiment, the impeller disk is cut in the plane where the axis of the impeller disk is located, and the connecting part has a first side and a second side that are arranged opposite each other in the axial direction, and the included angle t1 between the first side and the second side satisfies 5°≤t1≤14°.

[0011] In an optional embodiment, the thickness d of the outer end of the connecting portion in the radial direction satisfies 0.8mm≤d≤3mm.

[0012] In an optional embodiment, the impeller assembly further includes an impeller end ring and blades. The impeller end ring is connected to the impeller disk via the blades. The side of the impeller end ring facing the impeller disk has an inclined surface. The vertical distance between each point on the inclined surface and the axis of the impeller disk satisfies the following condition: the vertical distance gradually increases along the direction gradually away from the impeller disk.

[0013] In an optional embodiment, the angle t2 between the inclined surface and the cross-section satisfies 2.5°≤t2≤7°, and the cross-section is perpendicular to the axis of the impeller disk.

[0014] Secondly, this utility model provides a fan, including an impeller assembly as described in any of the foregoing embodiments.

[0015] The impeller assembly and fan provided by this utility model can produce the following beneficial effects: Compared with the prior art, in the impeller assembly provided by the first aspect of this utility model, a shroud is connected to the side of the impeller disk away from the motor. After the outer peripheral surface of the shroud is cut by the plane where the axis of the impeller disk is located, the trajectory line gradually moves away from the axis of the impeller disk along the direction that gradually approaches the impeller disk. The axially moving airflow is turned to radial discharge under the guidance of the outer peripheral surface of the shroud, so that the axial flow velocity of the airflow is more uniform and the performance of the fan is guaranteed.

[0016] The fan provided in the second aspect of this utility model has the impeller assembly provided in the first aspect of this utility model, and thus has all the beneficial effects of the impeller assembly provided in the first aspect of this utility model. Attached Figure Description

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

[0018] Figure 1 An exploded view of the impeller assembly provided in an embodiment of this utility model; Figure 2 Front view of the impeller assembly provided in the embodiment of this utility model Figure 1 ; Figure 3 for Figure 2 AA section diagram; Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point B; Figure 5 A schematic diagram in a coordinate system of the formula satisfied by the shape of the curve extension path provided in the embodiments of this utility model; Figure 6 Front view of the impeller assembly provided in the embodiment of this utility model Figure 2 ; Figure 7 for Figure 6 CC section view; Figure 8 A front view of the impeller disk, fairing, impeller end ring 4, and blades when they are assembled, according to an embodiment of this utility model. Figure 9 for Figure 8 DD cross-sectional view; Figure 10 for Figure 9 Enlarged schematic diagram of the structure at point E.

[0019] Icons: 1-Impeller center plate; 11-Connecting part; 111-First side; 112-Second side; 2-Fairing; 21-End plate; 22-Outer peripheral plate; 221-Outer peripheral surface; 2211-Trajectory line; 222-Snap-on; 3-Motor; 4-Impeller end ring; 41-Inclined surface; 5-Blade; 6-Cross-section; 7-Inlet ring; 8-Vortex. Detailed Implementation

[0020] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0024] The first aspect of this utility model provides an impeller assembly, such as... Figures 1 to 4 As shown, it includes an impeller disk 1 and a fairing 2; The fairing 2 is connected to the impeller disk 1 and is located on the side of the impeller disk 1 away from the motor 3. The fairing 2 has an outer peripheral surface 221 arranged around the axis of the impeller disk 1. The outer peripheral surface 221 is cut off by the plane where the axis of the impeller disk 1 is located. The cut surface has a trajectory line 2211 that is relatively set on the outer peripheral surface 221. The trajectory line 2211 is curved. The vertical distance between each point on the curve and the axis of the impeller disk 1 satisfies the following: the vertical distance gradually increases as it gets closer to the impeller disk 1.

[0025] It should be noted that since the outer peripheral surface 221 is set around the axis of the impeller disk 1, when the outer peripheral surface 221 is cut by the plane where the axis of the impeller disk 1 is located, there are two trajectory lines at the cut surface corresponding to the outer peripheral surface 221. The two trajectory lines 2211 are symmetrically set with respect to the axis of the impeller disk 1, and both trajectory lines 2211 are curved.

[0026] In the impeller assembly provided in the above embodiments, such as Figure 3 As shown, the impeller disk 1 is connected to the shroud 2 on the side opposite to the motor 3, as... Figure 4 As shown, after the outer peripheral surface 221 of the fairing 2 is cut by the plane where the axis of the impeller disk 1 is located, a trajectory line 2211 is formed at the cut surface corresponding to the outer peripheral surface 221. The closer the trajectory line 2211 is to the impeller disk 1 along the axial direction, the greater the vertical distance between the trajectory line 2211 and the axis of the impeller disk 1, and it forms an outwardly diffused curved structure. This structure can guide the airflow entering the impeller assembly axially to gradually turn and finally be discharged in a direction closer to the radial direction, thereby improving the uniformity of airflow distribution.

[0027] by Figure 4 For example, to illustrate the statement "as trajectory line 2211 gradually approaches impeller disk 1, its perpendicular distance to the axis of impeller disk 1 gradually increases": Select any two points A and B on trajectory line 2211. The perpendicular distance between point A and the axis of impeller disk 1 is L1, and the perpendicular distance between point B and the axis of impeller disk 1 is L2. Figure 4 It can be seen that point B is closer to the impeller disk 1 than point A, so L2 is greater than L1.

[0028] The aforementioned trajectory line 2211 can be a smoothly transitioning curve, such as an arc or a wavy line, to reduce resistance loss during airflow and further improve the efficiency of the fan.

[0029] like Figure 4 and Figure 5 As shown, the shape of the curve extension path satisfies the following formula: S=h*[δ / δ0-sin2πδ / δ0 / 2π]; Where: h is the radial distance between the two ends of the curve in the axial direction; δ0 is the axial distance between the two ends of the curve in the axial direction; δ is the axial distance between any point on the curve and the end of the curve away from the impeller disk 1; S is the radial distance between any point on the curve and the end of the curve away from the impeller disk 1.

[0030] In the above formula, δ can be regarded as the independent variable, and S can be regarded as the dependent variable. During the design, by setting the parameters h and δ0, and combining the above formula, the position of the trajectory line 2211 in the axial and radial coordinate systems can be calculated point by point, thereby generating the outer peripheral surface 221 that conforms to the curve law.

[0031] It is understandable that the axial and radial directions mentioned above and below are with reference to the impeller disk 1. The axial direction of the impeller disk 1 is defined as the axial direction in the coordinate system, and the radial direction of the impeller disk 1 is defined as the radial direction in the coordinate system.

[0032] The above formula corrects the linear change by using a sine function, making the airflow velocity more uniform during the transition from axial to radial, reducing the separation of airflow and the formation of vortices on the surface of the shroud 2, which is beneficial to improving the overall efficiency of the fan.

[0033] You can also refer to Figure 4 As shown, the flow section between blade 5 and fairing 2 is set as A, where A = π * [(d1 + d2)] 2 -(d1+S) 2 〕, where d1 is the distance between the end of the curve away from the impeller disk 1 and the axis of the impeller disk 1, and d2 is the distance between the end of the curve away from the impeller disk 1 and the radially opposite blade 5.

[0034] The above-described embodiments enable the area of ​​the flow section A along the axial direction to vary according to a cycloid curve, making the airflow velocity more uniform during the transition from the axial to the radial direction.

[0035] In an optional embodiment, in order to make the structure of the fairing 2 simpler and easier to manufacture and assemble, the fairing 2 includes an end plate 21 and an outer peripheral plate 22. One end of the outer peripheral plate 22 is connected to the end plate 21, and the other end is connected to the impeller disk 1. The outer surface of the outer peripheral plate 22 is defined as the outer peripheral surface 221.

[0036] Specifically, the end plate 21 has a circular structure and is located at the end of the fairing 2 away from the impeller disk 1. It is used to block the opening end of the fairing 2 and also serves to guide the airflow. The outer peripheral plate 22 is an annular structure arranged around the outer edge of the end plate 21. One end of the plate is fixedly connected to the outer periphery of the end plate 21, and the two are smoothly transitioned. The other end is connected to the impeller disk 1, thus forming the overall structure of the fairing 2.

[0037] The fairing 2 can be integrally formed by stamping, injection molding or other suitable manufacturing processes. Alternatively, the end plate 21 and the outer peripheral plate 22 can be manufactured separately and then fixedly connected by welding, riveting, threaded connection or other methods. The specific process can be flexibly adjusted according to the material selection and production conditions.

[0038] In alternative implementations, such as Figure 4 As shown, the end plate 21 is perpendicular to the axial direction of the impeller disk 1 and is away from the outer surface of the impeller disk 1. After the axial airflow comes into contact with the outer surface, it can quickly turn and be discharged radially.

[0039] Of course, the end plate 21 can also be set to protrude from the outer surface of the impeller disk 1 away from the impeller disk 1 along the direction away from the axial end face of the impeller disk 1.

[0040] In an optional embodiment, the outer peripheral plate 22 of the fairing 2 and the impeller disk 1 can be detachably connected to improve assembly convenience and structural stability.

[0041] Specifically, such as Figure 6 and Figure 7 As shown, the outer peripheral plate 22 is connected to the impeller disk 1 via a snap-fit ​​structure. The snap-fit ​​structure includes a snap fastener 222 on the outer peripheral plate 22 and a corresponding slot on the impeller disk 1. During assembly, the snap fastener 222 is pressed axially into the slot, and then the fairing 2 is rotated to achieve the snap-fit ​​between the snap fastener 222 and the slot.

[0042] In an optional embodiment, to make the position of the fairing 2 relative to the impeller disk 1 more secure, fasteners are provided between the outer peripheral plate 22 and the impeller disk 1 to lock their positions.

[0043] After the buckle 222 engages with the slot, the fairing 2 and the impeller disk 1 can be fixed by fasteners.

[0044] The fasteners mentioned above can be screws or pins, etc.

[0045] In other embodiments, the fairing 2 and the impeller disk 1 may be connected only by fasteners, without any snap-fit ​​structure between them.

[0046] Of course, the connection between the fairing 2 and the impeller disk 1 is not limited to the examples above; they can also be connected by other connection structures.

[0047] In alternative implementations, such as Figure 8 and Figure 9 As shown, the outer ring of the impeller disk 1 is provided with a connecting portion 11, and the thickness of the connecting portion 11 gradually decreases along the direction gradually away from the axis of the impeller disk 1. Specifically, as it extends outward from the central axis of the impeller disk 1, the cross-sectional thickness of the connecting portion 11 decreases continuously or in a stepped manner.

[0048] The main purpose of the above design is to improve the airflow state at the outlet of the impeller disk 1. Because the traditional outer ring connection structure of the impeller disk typically has a constant thickness, it is prone to generating local turbulence when airflow passes through, resulting in turbulent pulsations in the radial direction of the blades 5, which in turn causes noise and affects the performance of the fan. By designing the connection part 11 as a structure with gradually decreasing thickness, and gradually increasing the outlet area along the radial flow direction of the airflow, the turbulent pulsations in the radial direction of the blades 5 are effectively reduced, improving the performance of the air duct and reducing noise.

[0049] like Figure 9 As shown, the impeller disk 1 is cut in the plane where the axis of the impeller disk 1 is located. The connecting part 11 has a first side 111 and a second side 112 arranged opposite to each other in the axial direction. The first side 111 and the second side 112 are symmetrically arranged. The contour curves of the first side 111 and the second side 112 can be reasonably selected according to the aerodynamic optimization design, such as adopting a straight tapering, a circular arc tapering or a compound curve tapering.

[0050] In alternative implementations, such as Figure 9 As shown, the first side 111 and the second side 112 adopt a linear tapering shape, and the included angle t1 between them satisfies 5°≤t1≤14°, which can be 5°, 7°, 10°, 12° or 14°.

[0051] If the included angle t1 is less than 5°, the effect of increasing the outlet area along the radial flow direction of the airflow is weakened, and it cannot effectively suppress turbulent pulsation, resulting in poor noise control. If the included angle t1 exceeds 14°, when the thickness of the inner and outer ends of the connecting part 11 in the radial direction is constant, the radial dimension of the connecting part 11 will be shortened, thus affecting the installation of the blade 5. If the radial dimension of the connecting part 11 is guaranteed, the outer end of the connecting part 11 in the radial direction will be thinner, affecting the strength of the connecting part 11.

[0052] By limiting the included angle t1 between the first side 111 and the second side 112 to 5°≤t1≤14°, a good airflow guidance effect can be achieved in the impeller outlet area, effectively reducing airflow disturbance and turbulence pulsation, thereby improving the aerodynamic performance of the duct and helping to reduce the noise level during fan operation.

[0053] Preferably, the included angle t1 is 7°, at which point the airflow is more stable and the turbulence intensity is the lowest when passing through the connecting part 11, which is beneficial to improving the overall efficiency of the fan and reducing operating noise.

[0054] In alternative implementations, such as Figure 9 As shown, the thickness d of the outer end of the connecting part 11 in the radial direction satisfies 0.8mm≤d≤3mm, specifically it can be 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm or 3mm.

[0055] When the thickness d is less than 0.8 mm, the mechanical strength of the connection 11 will be significantly reduced, making it difficult to withstand the vibration and centrifugal force generated during the operation of the fan. This may lead to structural fatigue or even fracture, affecting the service life and operational stability of the impeller assembly. On the other hand, when the thickness d exceeds 3 mm, the size of the connection 11 in the outlet area is too large. This can easily cause a significant decrease in local airflow velocity and an increase in pressure gradient when the airflow exits the connection 11, thereby inducing airflow separation and turbulence, which in turn increases fan noise and reduces aerodynamic efficiency.

[0056] Therefore, by controlling the thickness d of the outer end of the connecting part 11 in the radial direction to between 0.8 mm and 3 mm, the above-described embodiment can not only effectively ensure structural strength and connection reliability, but also form a small gradient transition in the airflow outlet area, reducing airflow disturbance and energy loss, thereby achieving the technical effect of improving fan performance and reducing operating noise.

[0057] In alternative implementations, such as Figure 10 As shown, the impeller assembly also includes an impeller end ring 4 and blades 5. The impeller end ring 4 is connected to the impeller disk 1 through the blades 5. The side of the impeller end ring 4 facing the impeller disk 1 has an inclined surface 41. The vertical distance between each point on the inclined surface 41 and the axis of the impeller disk 1 satisfies the following condition: the vertical distance gradually increases along the direction that gradually moves away from the impeller disk 1.

[0058] Specifically, the further away each point on the inclined surface 41 is from the impeller disk 1 along its axial direction, the greater the vertical distance between each point and the axis of the impeller disk 1. For example... Figure 10 As shown, select any two points C and D on trajectory line 2211. Point C is farther away from the impeller disk 1 than point D. Therefore, the vertical distance between point C and the axis of the impeller disk 1 is greater than the vertical distance between point D and the axis of the impeller disk 1.

[0059] The design of the inclined surface 41 can gradually increase the outlet area of ​​the impeller end ring 4 along the radial flow direction of the airflow, improve the flow state of the airflow at the outlet of the impeller end ring 4, and reduce the turbulence generated by the airflow in the end ring region.

[0060] The impeller end ring 4 can be configured as two. Along the axial direction of the impeller disk 1, the two impeller end rings 4 are distributed on both sides of the impeller disk 1 and connected to the impeller disk 1 through the blades 5. Both impeller end rings 4 are provided with the aforementioned inclined surface 41.

[0061] In an optional embodiment, the included angle t2 between the inclined surface 41 and the cross-section 6 satisfies 2.5°≤t2≤7°, the cross-section 6 is perpendicular to the axis of the impeller disk 1, and t2 can specifically be 2.5°, 3.5°, 5°, 6° or 7°.

[0062] When t2 is less than 2.5°, the effect of increasing the outlet area along the radial flow direction of the airflow is weakened, and it cannot effectively suppress turbulent pulsation, resulting in poor noise control. If the included angle t2 is greater than 7°, when the thickness of the inner and outer ends of the impeller end ring 4 in the radial direction is constant, the radial dimension of the impeller end ring 4 will be shortened. If the radial dimension of the impeller end ring 4 is maintained, the outer end of the impeller end ring 4 in the radial direction will be thinner, both of which will affect the strength of the impeller end ring 4.

[0063] Both included angles t2 and t1 are designed according to the Venturi effect. By limiting included angle t2 as described above, and in conjunction with limiting included angle t1, the airflow is made to flow along the tilt angle of the connecting part 11 and the tilt angle of the left and right impeller end rings 4. This can effectively reduce turbulence at the middle plate and end rings, eliminate turbulent pulsation of airflow in the radial direction of the blades, thereby improving the performance of the air duct and reducing noise.

[0064] In alternative implementations, such as Figure 1 As shown, the impeller assembly may also include an air inlet ring 7 and a volute 8. The air inlet ring 7 and the motor 3 are both connected to the volute 8. The connection between the three can be achieved by screws or clips.

[0065] Specifically, the impeller disc 1 is mounted on the power output shaft of the motor 3 and is fixedly connected to the power output shaft of the motor 3 by a locking nut.

[0066] A second aspect of this utility model provides a fan, which includes the impeller assembly described above.

[0067] The fan provided in the second aspect of this utility model has the impeller assembly provided in the first aspect of this utility model, and thus has all the beneficial effects of the impeller assembly provided in the first aspect of this utility model.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An impeller assembly, characterized in that, Includes impeller center disk (1) and fairing (2); The fairing (2) is connected to the impeller disk (1) and is located on the side of the impeller disk (1) away from the motor (3). The fairing (2) has an outer peripheral surface (221) arranged around the axis of the impeller disk (1). The outer peripheral surface (221) is cut off by the plane where the axis of the impeller disk (1) is located. The cut surface has a trajectory line (2211) that is relatively set on the outer peripheral surface (221). The trajectory line (2211) is curved. The vertical distance between each point on the curve and the axis of the impeller disk (1) satisfies the following: the vertical distance gradually increases along the direction that gradually approaches the impeller disk (1).

2. The impeller assembly according to claim 1, characterized in that, The shape of the curve extension path satisfies the following formula: S=h*[δ / δ0-sin(2πδ / δ0) / (2π)]; Where: h is the radial distance between the two ends of the curve in the axial direction; δ0 is the axial distance between the two ends of the curve in the axial direction; δ is the axial distance between any point on the curve and the end of the curve away from the impeller disk (1); S is the radial distance between any point on the curve and the end of the curve away from the impeller disk (1).

3. The impeller assembly according to claim 1, characterized in that, The fairing (2) includes an end plate (21) and an outer peripheral plate (22). One end of the outer peripheral plate (22) is connected to the end plate (21), and the other end is connected to the impeller disk (1). The outer peripheral plate (22) has the outer peripheral surface (221).

4. The impeller assembly according to claim 3, characterized in that, The outer peripheral plate (22) is engaged with the impeller disk (1), and / or, a fastener is provided between the outer peripheral plate (22) and the impeller disk (1) to lock their positions.

5. The impeller assembly according to claim 1, characterized in that, The outer ring of the impeller disk (1) is provided with a connecting part (11), and the thickness of the connecting part (11) gradually decreases along the direction that gradually moves away from the axis of the impeller disk (1).

6. The impeller assembly according to claim 5, characterized in that, The impeller disk (1) is cut in the plane where the axis of the impeller disk (1) is located. The connecting part (11) has a first side (111) and a second side (112) arranged opposite to each other in the axial direction. The included angle t1 between the first side (111) and the second side (112) satisfies 5°≤t1≤14°.

7. The impeller assembly according to claim 5, characterized in that, The thickness d of the outer end of the connecting part (11) in the radial direction satisfies 0.8mm≤d≤3mm.

8. The impeller assembly according to any one of claims 1-7, characterized in that, The impeller assembly also includes an impeller end ring (4) and blades (5). The impeller end ring (4) is connected to the impeller disk (1) through the blades (5). The side of the impeller end ring (4) facing the impeller disk (1) has an inclined surface (41). The vertical distance between each point on the inclined surface (41) and the axis of the impeller disk (1) satisfies the following: the vertical distance gradually increases along the direction that gradually moves away from the impeller disk (1).

9. The impeller assembly according to claim 8, characterized in that, The angle t2 between the inclined surface (41) and the cross section (6) satisfies 2.5°≤t2≤7°, and the cross section (6) is perpendicular to the axis of the impeller disk (1).

10. A fan, characterized in that, Includes the impeller assembly as described in any one of claims 1-9.

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