A bladed disk structure and a multi-blade centrifugal fan

Abstract

This utility model relates to the field of fan technology, specifically to a bladed disk structure and a multi-blade centrifugal fan, including a main body and auxiliary blades. The middle part of the main body protrudes in a first direction to form a conical surface. The auxiliary blades are uniformly arrayed and fixed on the conical surface along the circumference. Each auxiliary blade includes a first surface and a second surface facing away from each other. The first surface of each auxiliary blade is biased towards the second direction of the main body relative to the axial center line L of the main body. Ventilation holes are provided on the conical surface in the same number as the auxiliary blades, and each ventilation hole is located on the side where the second surface of the corresponding auxiliary blade is located. This utility model, by uniformly arranging multiple forward-inclined auxiliary blades on the conical surface, can actively pre-compress the airflow, improve the inflow angle and velocity, increase air volume and air pressure, and reduce vortex noise when the impeller and bladed disk rotate synchronously. This utility model also provides ventilation holes on the rear side of each auxiliary blade to further introduce airflow from behind the bladed disk and optimize the intake conditions.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, specifically to a bladed disk structure and a multi-blade centrifugal fan. Background Technology

[0002] Multi-blade centrifugal fans are commonly used machines for transporting gas. Their operation relies on a high-speed rotating impeller performing work on the gas to achieve gas transport. Compared to other types of gas transport equipment, multi-blade centrifugal fans have lower operating noise, and are therefore widely used in household appliances such as range hoods, air purifiers, and air conditioners.

[0003] However, existing multi-blade centrifugal fans still have certain shortcomings. For example, the impellers and disks in existing multi-blade centrifugal fans mainly adopt a smooth conical structure, and the functions of the impellers and disks are mainly assembly and load-bearing, such as supporting the impeller. However, the existing impeller and disk structures cannot effectively guide the airflow and cannot improve the operating conditions of multi-blade centrifugal fans. Utility Model Content

[0004] To address the shortcomings of existing multi-blade centrifugal fans, this invention provides a bladed disk structure and a multi-blade centrifugal fan. Multiple forward-inclined auxiliary blades are evenly arranged on the conical surface of the bladed disk. When the bladed disk and impeller rotate synchronously, the auxiliary blades can actively pre-compress the airflow, improve the inflow angle and velocity, increase air volume and pressure, and reduce vortex noise. Furthermore, this invention also provides ventilation holes on the rear side of each auxiliary blade to further introduce airflow from behind the bladed disk, optimizing the intake conditions.

[0005] The technical solution provided by this utility model is as follows: a bladed disk structure, including a main body and auxiliary blades; the middle part of the main body protrudes in a first direction to form a conical surface, and the auxiliary blades are uniformly arrayed and fixed on the conical surface along the circumference. The auxiliary blades include a first surface and a second surface facing away from each other, and each auxiliary blade is positioned relative to the axial center line L of the main body so that the first surface is biased towards the second direction of the main body; wherein, the second direction is the opposite direction to the first direction; the conical surface is provided with ventilation holes of the same number as the number of auxiliary blades, and each ventilation hole is located on the side where the second surface of the corresponding auxiliary blade is located.

[0006] Optionally, the ventilation hole is rectangular, and the rectangular ventilation hole has the same inclination as the auxiliary blade.

[0007] Optionally, at least one interior corner of the rectangular ventilation opening is rounded.

[0008] Optionally, the area of ​​the ventilation hole is S1, and the area of ​​the auxiliary blade is S2, where S1 is 1.5 to 2.5 times S2.

[0009] Optionally, the auxiliary blade and the axial center line L of the main body form a forward tilt angle α, wherein the forward tilt angle α satisfies 30°≤a≤40°.

[0010] Optionally, the auxiliary blade is provided with a fixing part, and the auxiliary blade is fixedly connected to the main body through the fixing part.

[0011] Optionally, the fixing part is a fixing plate, the surface of the fixing plate that abuts against the conical surface is a curved surface, and the curved surface matches the conical surface.

[0012] Optionally, the auxiliary blade is integrally formed with the main body.

[0013] A multi-blade centrifugal fan includes the aforementioned bladed disk structure and an impeller, the impeller being fixedly disposed on the side of the main body where the auxiliary blades are located.

[0014] Beneficial effects

[0015] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects: Addressing the shortcomings of existing multi-blade centrifugal fans, the impeller structure and multi-blade centrifugal fan proposed in this utility model, by evenly arranging multiple forward-inclined auxiliary blades on the conical surface of the impeller, achieve active pre-compression of the airflow, improve the inflow angle and velocity, increase air volume and pressure, and reduce vortex noise when the impeller and impeller rotate synchronously after the fan starts. Furthermore, this utility model also provides ventilation holes corresponding to the rear side of each auxiliary blade to further introduce airflow from behind the impeller, optimizing the intake conditions. Attached Figure Description

[0016] Figure 1 This is one of the three-dimensional schematic diagrams of the impeller structure proposed in the embodiments of this utility model.

[0017] Figure 2 This is a front view schematic diagram of the bladed disk structure proposed in an embodiment of this utility model.

[0018] Figure 3 This is a schematic diagram of the structure of the auxiliary blade proposed in an embodiment of the present invention.

[0019] Figure 4 This is the second perspective view of the impeller structure proposed in the embodiment of this utility model.

[0020] Figure 5 This is a schematic diagram of the assembly of the impeller structure and impeller proposed in an embodiment of the present invention. Detailed Implementation

[0021] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0022] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the utility model. Furthermore, it should be noted that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings. The terms "first," "second," etc., used in this utility model are provided for the convenience of describing the technical solution of this utility model and have no specific limiting effect; they are all general terms and do not constitute a limitation on the technical solution of this utility model. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. 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., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the 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 on this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections 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 based on the specific circumstances. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict, all of which are within the scope of protection claimed by this utility model.

[0023] Example 1

[0024] Combined with appendix Figure 1 To be continued Figure 5 This embodiment proposes an impeller structure, including a main body 1 and auxiliary blades 2. The main body 1 has a central portion that protrudes in a first direction to form a conical surface 10. The auxiliary blades 2 are uniformly arrayed and fixed on the conical surface 10 along the circumference. Each auxiliary blade 2 includes a first surface 21 and a second surface 22 facing away from each other. The first surface 21 of each auxiliary blade 2 is biased towards a second direction relative to the axial centerline L of the main body 1, where the second direction is opposite to the first direction. Furthermore, the conical surface 10 has ventilation holes 20 in the same number as the auxiliary blades 2, each ventilation hole 20 located on the side where the second surface 22 of the corresponding auxiliary blade 2 is located.

[0025] In this embodiment, a plurality of auxiliary blades 2 are uniformly arranged on the conical surface 10 of the bladed disk structure. The number of auxiliary blades 2 can be determined according to the product specifications, as shown in the attached figure. Figure 1 For example, seven auxiliary blades 2 can be set. The auxiliary blades 2 are inclined on the conical surface 10, with the first surface 21 inclined towards the second direction of the main body 1, and correspondingly, the second surface 22 inclined towards the first direction of the main body 1. Further combined with... Figure 2 The orientation relationship, where the first surface 21 is biased towards the second direction of the main body 1 means that the first surface 21 is located on the "lower left side" of the second surface 22, while the second surface 22 is located on the "upper left side" of the first surface 21.

[0026] In this embodiment, the auxiliary blade 2 is tilted forward. The tilted auxiliary blade 2 and the axial center line L of the main body 1 form a tilt angle α. Generally, the tilt angle α satisfies 30°≤α≤40°. In the preferred embodiment, the tilt angle α is 30°. The conical surface 10 is preferably a truncated conical surface.

[0027] The impeller structure in this embodiment is used to construct a multi-blade centrifugal fan and is generally used in conjunction with the impeller 3. The impeller 3 is generally fixed to the main body 1, forming a protrusion on one side. When the multi-blade centrifugal fan starts and the impeller structure rotates, the auxiliary blades 2 also rotate synchronously. During the rotation of the impeller structure, the forward-tilted auxiliary blades 2 can enhance the tangential velocity component of the airflow while ensuring sufficient axial airflow component, which is beneficial to the effective conversion of kinetic energy into dynamic pressure, thereby improving the flow field stability and intake efficiency at the inlet of the impeller 3.

[0028] In this embodiment, a ventilation hole 20 is provided on one side of the second surface 22 of each auxiliary blade 2 (i.e., the rear side relative to the direction of rotation). By using the ventilation hole 20, airflow can be further introduced from the rear of the impeller 3 to optimize the intake conditions and further improve the uniformity of the intake airflow field and the system operating efficiency.

[0029] In a preferred embodiment, the ventilation hole 20 is rectangular, and the rectangular ventilation hole 20 has the same inclination as the auxiliary blade 2. In conjunction with the aforementioned embodiments, the angle formed between the rectangular ventilation hole 20 and the axial centerline L of the main body 1 can be consistent with the forward tilt angle α of the auxiliary blade 2, which is also 30°≤α≤40°. This obliquely placed rectangular opening structure, compared to the circular holes on traditional impellers, provides a larger effective flow area, helping to introduce more airflow to the impeller 3 inlet of the multi-blade centrifugal fan.

[0030] Furthermore, at least one interior corner of the rectangular ventilation hole 20 can be rounded. Preferably, all four interior corners of the ventilation hole 20 can be rounded. By rounding the interior corners, stress concentration in the corner area of ​​the ventilation hole 20 on the conical surface 10 can be effectively alleviated, thereby improving the overall safety and durability of the impeller structure.

[0031] In another embodiment, the area of ​​the ventilation hole 20 is S1, and the area of ​​the auxiliary blade 2 is S2, where S1 is 1.5 to 2.5 times S2, preferably 2 times. This arrangement ensures the formation of a sufficient air intake channel, introducing the airflow from the rear of the bladed disk structure into the front region of the impeller 3 (bladed disk structure).

[0032] In this embodiment, the auxiliary blade 2 needs to be fixedly connected to the main body 1 of the bladed disk structure. In a preferred embodiment, the auxiliary blade 2 is provided with a fixing part 23, and the auxiliary blade 2 is fixedly connected to the main body 1 through the fixing part 23.

[0033] The fixing part 23 can be a connecting seat or connecting block for assembling bolts, rivets, and other connecting parts on the side of the auxiliary blade 2 near the main body 1. For example, it can be as shown in the attached figure. Figure 3 The fixed plate is shown. When the fixed part 23 is a fixed plate, the fixed part 23 is first connected to the auxiliary blade 2 by integral molding, welding, bonding, connection with connectors or other fixed connection methods. The auxiliary blade 2 can then be connected to the main body 1 by the fixed part 23 through connectors, welding, bonding or other fixed connection methods. This arrangement forms a reliable connection between the auxiliary blade 2 and the main body 1 of the impeller structure, ensuring that the impeller structure and the auxiliary blade 2 on it rotate synchronously with the impeller 3 at the same speed.

[0034] When the fixing part 23 is as shown in the appendix Figure 3 In the case of the fixing plate shown, the surface of the fixing plate that abuts against the conical surface 10 is further configured as a curved surface, and the curved surface matches the conical surface 10. This implementation allows the fixing plate to fit tightly against the conical surface 10, thereby achieving a tight matching installation between the auxiliary blade 2 and the main body 1 of the bladed disk structure.

[0035] In other embodiments, the fixing part 23 on the auxiliary blade 2 can also be a snap-fit ​​module. In this case, the main body 1 of the bladed disk structure is also provided with a connecting module that cooperates with it. When the snap-fit ​​module and the connecting module form a snap-fit ​​engagement, a reliable connection can also be formed between the auxiliary blade 2 and the main body 1 of the bladed disk structure.

[0036] For the fixed connection between the auxiliary blade 2 and the main body 1 in this embodiment, please refer to the appendix. Figure 4Another form shown is where the auxiliary blade 2 is integrally formed with the main body 1. In this form, the auxiliary blade 2 is part of the main body 1 and is formed by bending it directly on the conical surface 10. This form can further reduce manufacturing costs and simplify the production process.

[0037] Furthermore, since the auxiliary blade 2 comes from the conical surface 10, when the auxiliary blade 2 is bent and formed, a retention hole with the same shape as the auxiliary blade 2 will naturally be left on the conical surface 10. By simply processing the retention hole, the ventilation hole 20 can be directly formed. Therefore, this implementation method further simplifies the forming process of the ventilation hole 20.

[0038] Alternatively, the original volume and outline of the part to be bent and shaped can be designed as the style of the required ventilation hole 20. In this way, the reserved hole on the main body 1 can itself serve as the required ventilation hole 20, and the auxiliary blade 2 can be obtained by processing the bent and shaped part. This implementation method further simplifies the forming process of the ventilation hole 20.

[0039] In summary, addressing the shortcomings of existing multi-blade centrifugal fans, the impeller structure of this embodiment, by uniformly arranging multiple forward-inclined auxiliary blades 2 on the conical surface 10 of the impeller, effectively pre-compresses the airflow, improves the inflow angle and velocity, increases air volume and pressure, and reduces vortex noise when the impeller 3 rotates synchronously after the fan starts. Furthermore, this embodiment also provides ventilation holes 20 on the rear side of each auxiliary blade 2 to further introduce airflow from behind the impeller, optimizing the intake conditions.

[0040] Example 2

[0041] Combined with appendix Figure 1 To be continued Figure 5 This embodiment proposes a multi-blade centrifugal fan, which includes the bladed disk structure described in the technical solution of embodiment 1, and also includes an impeller 3, which is fixedly disposed on the side of the main body 1 where the auxiliary blades 2 are located.

[0042] The multi-blade centrifugal fan in this embodiment is equipped with the impeller structure of Embodiment 1. Utilizing the forward tilt angle α of the impeller structure, it pressurizes and accelerates the airflow, providing excellent pre-guiding effect. Through the guidance of the auxiliary blades 2, the airflow entering the multi-blade centrifugal fan enters at a more reasonable incident angle, thereby reducing angle-of-attack loss, improving flow adhesion, and significantly enhancing the fan's aerodynamic efficiency. Simulation analysis verifies that after setting the auxiliary blades 2 in this embodiment, the total pressure recovery coefficient at the inlet of the multi-blade centrifugal fan increases by more than 10%, the angle of attack decreases by more than 20%, the airflow adhesion rate is significantly enhanced, and the overall aerodynamic efficiency increases by nearly 10%.

[0043] When the multi-blade centrifugal fan is operating, the auxiliary blades 2, the impeller structure, and the impeller 3 rotate synchronously, achieving a consistent motion trajectory with the rotating airflow. This effectively suppresses unsteady disturbances in the inlet region of the multi-blade centrifugal fan, reduces eddies and local backflow phenomena, and further enhances the stability of the inlet flow field of the impeller 3. Simultaneously, the auxiliary blades 2 possess a certain aerodynamic working surface, which assists in the initial compression and acceleration of the airflow, working in conjunction with the main blades on the impeller 3 to complete the centrifugal transport of the gas, thereby effectively improving the airflow and air pressure output performance of the multi-blade centrifugal fan.

[0044] The smooth guiding effect of the auxiliary blades 2 can effectively reduce the high-frequency airflow impact at the impeller 3 inlet, reduce the noise caused by turbulent vibration, and improve the quiet operation of the multi-blade centrifugal fan. In addition, the uniform distribution of the auxiliary blades 2 helps to improve the structural stress and mass distribution of the impeller 3, enhance the dynamic balance control capability, reduce the risk of resonance, and extend the equipment life.

[0045] This embodiment also makes full use of the originally unused conical surface 10 area. By adding auxiliary blades 2, the functional density of the impeller 3 and the aerodynamic output capacity per unit volume are improved, which is especially suitable for the performance optimization of compact multi-blade centrifugal fan products.

[0046] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A bladed disc structure, characterised in that, It includes the main body (1) and auxiliary blades (2); The middle part of the main body (1) protrudes in a first direction to form a conical surface (10), and the auxiliary blades (2) are uniformly arrayed and fixed on the conical surface (10) along the circumference. The auxiliary blades (2) include a first surface (21) and a second surface (22) facing away from each other. Each of the auxiliary blades (2) is inclined relative to the axial center line L of the main body (1) so that the first surface (21) is biased toward the second direction of the main body (1); wherein the second direction is the opposite direction to the first direction; The conical surface (10) is provided with ventilation holes (20) in the same number as the auxiliary blades (2), and each ventilation hole (20) is located on the side where the second surface (22) of the corresponding auxiliary blade (2) is located.

2. The bladed disk structure according to claim 1, characterized in that, The ventilation hole (20) is rectangular, and the rectangular ventilation hole (20) has the same inclination as the auxiliary blade (2).

3. The bladed disk structure according to claim 2, characterized in that, At least one interior corner of the rectangular ventilation hole (20) is rounded.

4. A bladed disk structure according to claim 1 or 2, characterized in that, The area of ​​the ventilation hole (20) is S1, and the area of ​​the auxiliary blade (2) is S2, where S1 is 1.5 to 2.5 times that of S2.

5. The bladed disk structure according to claim 1, characterized in that, The auxiliary blade (2) and the axial center line L of the main body (1) form a forward tilt angle a, which satisfies 30°≤a≤40°.

6. The bladed disk structure according to claim 1, characterized in that, The auxiliary blade (2) is provided with a fixing part (23), and the auxiliary blade (2) is fixedly connected to the main body (1) through the fixing part (23).

7. The bladed disk structure according to claim 6, characterized in that, The fixing part (23) is a fixing plate, and the surface of the fixing plate that abuts against the conical surface (10) is a curved surface, and the curved surface matches the conical surface (10).

8. The bladed disk structure according to claim 1, characterized in that, The auxiliary blade (2) is integrally formed with the main body (1).

9. A multi-blade centrifugal fan, comprising the impeller structure described in any one of claims 1-8, characterized in that, It also includes an impeller (3), which is fixedly disposed on the side of the main body (1) where the auxiliary blade (2) is located.

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