Axial centrifugal fan

Abstract

The present invention discloses an axial centrifugal electric blower comprising: a fan housing, a rotor, a diffuser bracket, and a motor. The fan housing is provided with a working air inlet. The diffuser bracket includes a mounting seat, an inner diffuser housing, an outer diffuser housing, and a plurality of axial diffuser blades positioned between the outer diffuser housing and the inner diffuser housing. The outer diffuser housing, the inner diffuser housing, and the plurality of axial diffuser blades define a plurality of diffuser channels. The diffuser channel housing has an elliptical cross-section, and at least the rear portion of the fan housing has an elliptical cross-section. The front portion of the diffuser housing is sealed to the rear portion of the fan housing. Within the same cross-section of the diffuser bracket, the cross-sectional areas of the plurality of diffuser channels may be different. This fan is easy to install and has low noise.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to an axial centrifugal electric fan for household sanitary cleaning equipment. Background Art

[0002] Volute centrifugal fans are a traditional type of fan and are widely used in sweeping robots. However, these fans suffer from drawbacks such as inconvenient or costly performance adjustments and poor efficiency at high power levels (e.g., greater than 100W). To overcome these drawbacks, some existing sweeping robots use axial centrifugal fans instead. However, these fans have numerous limitations, such as inconvenient installation due to their airflow and structural characteristics, and louder noise levels compared to volute centrifugal fans at the same power level. Therefore, there is an urgent need for a fan that can address these drawbacks. Summary of the Invention

[0003] In order to solve the above technical problems, an object of the present invention is to provide an axial centrifugal electric fan that is easy to install and has low noise.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: an axial centrifugal electric fan, comprising:

[0005] An air hood, wherein the front portion of the air hood is provided with a working air inlet and the rear portion is open, and the interior of the air hood defines a space;

[0006] a moving impeller, the moving impeller being installed in the space;

[0007] A diffuser bracket, the diffuser bracket comprising a mounting seat, a diffuser flow channel inner shell located outside the mounting seat, a diffuser flow channel outer shell located outside the diffuser flow channel inner shell, and a plurality of axial diffuser blades located between the diffuser flow channel outer shell and the diffuser flow channel inner shell, the plurality of axial diffuser blades being distributed along a circumferential direction, the diffuser flow channel outer shell, the diffuser flow channel inner shell, and the plurality of axial diffuser blades defining a plurality of diffuser flow channels;

[0008] The motor comprises a rotating shaft, the impeller being mounted on a front portion of the rotating shaft and configured to be driven to rotate by the motor;

[0009] Among them, the cross-section of the diffuser flow channel shell is elliptical, the cross-section of at least the rear part of the wind cover is elliptical, the front part of the diffuser flow channel shell is sealedly connected to the rear part of the wind cover, and on the same cross-section of the diffuser bracket, the cross-sectional areas of the multiple diffusers are not exactly the same.

[0010] In the above technical solution, preferably, the cross-section of the inner shell of the diffuser flow channel is circular.

[0011] In the above technical solution, preferably, the impeller includes a front wheel disc and a rear wheel disc that are arranged opposite to each other, and a plurality of impeller blades located between the front wheel disc and the rear wheel disc.

[0012] In the above technical solution, preferably, the interior of the diffuser flow channel inner shell has a chamber located behind the mounting seat, the motor is installed in the chamber, and the front part of the rotating shaft passes through the mounting seat and is connected to the impeller.

[0013] In the above technical solution, preferably, the pressure diffuser bracket is an integrated component.

[0014] In the above technical solution, preferably, the motor has a flat structure.

[0015] The present invention changes the structure of the wind cover and diffuser bracket of the existing axial centrifugal electric fan, making the axial centrifugal electric fan "flattened" and reducing the installation height; and in the diffusion process of the axial centrifugal electric fan in this case, since the cross-sectional areas of different diffuser flow channels are not the same, the flow field states of each flow channel will be different, without affecting the diffusion effect, the overall flow field is disturbed and the noise is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a half-section view of the present invention;

[0017] Figure 2 is an exploded view of the present invention;

[0018] Figure 3 is a schematic diagram of a moving impeller of the present invention;

[0019] Figure 4 Schematic diagram of the expansion stent of the present invention Figure 1 ;

[0020] Figure 5 Schematic diagram of the expansion stent of the present invention Figure 2 ;

[0021] Figure 6 is a bottom view of the pressure expansion stent of the present invention;

[0022] Figure 7 This is a flow diagram of the working wind of the present invention;

[0023] Among them: 100, axial centrifugal fan; 1, wind cover; 10, working air inlet; 11, space; 2, impeller; 20, front wheel disc; 21, moving blades; 22, hub; 23, rear wheel disc; 3, diffuser bracket; 30, mounting seat; 31, diffuser flow channel inner shell; 32, diffuser flow channel outer shell; 33, axial diffuser blades; 3301, major axis direction; 3302, minor axis direction; 34, diffuser flow channel; 35, chamber; 4, outer rotor digital motor; 40, rotating shaft; 5, working air. DETAILED DESCRIPTION

[0024] In order to explain the technical content, structural features, objectives and effects of the present invention in detail, the following will be described in detail with reference to the embodiments and accompanying drawings. Figure 1 The various positional relationships shown in correspond to each other.

[0025] like Figure 1 、 2 The axial centrifugal blower 100 shown in FIG. 7 includes a fan housing 1, a rotor impeller 2, a diffuser bracket 3, and an outer rotor digital motor 4. The fan housing 1 is located at the front of the axial centrifugal blower 100. A working air inlet 10 is provided at the front center of the fan housing 1. The rear of the fan housing 1 is open, defining a space 11 within the interior of the fan housing 1. The rotor impeller 2 is disposed within this space 11.

[0026] like Figure 3 As shown, the impeller 2 is a mixed flow impeller comprising a front disc 20, a rear disc 23 positioned opposite the front disc 20, a plurality of impeller blades 21, and a hub 22. The rear disc 23 is riveted to the hub 22. The plurality of impeller blades 21 are distributed circumferentially between the front disc 20 and the rear disc 23. In this example, the front disc 20 utilizes a third-order Bezier curve. The flow cross-sections within the impeller 2 remain essentially stable in the radial direction, effectively eliminating vortices within the impeller blades 21 caused by large variations in the flow cross-sections, resulting in high impeller efficiency.

[0027] like Figure 2 、 4As shown in Figure 6, the diffuser bracket 3 is located behind the impeller 2 and is an integral component. Inside the diffuser bracket 3 is its mounting base 30. Outside the mounting base 30 is a cylindrical diffuser channel inner shell 31, which has a circular cross-section. Outside the diffuser channel inner shell 31 is the diffuser channel outer shell 32. In this example, the diffuser channel outer shell 32 has an elliptical cross-section, with a major axis 3301 and a minor axis 3302. Between the diffuser channel outer shell 32 and the diffuser channel inner shell 31 are multiple axial diffuser blades 33, distributed circumferentially. These multiple axial diffuser blades 33 are located behind the impeller 2, in a relative front-to-back relationship. In this example, the axial diffuser blades 33 utilize a three-dimensional curved surface, facilitating mold development while maximizing the use of limited circumferential space, effectively extending the diffuser distance and improving the efficiency of the electric blower. The diffuser outer shell 32, the diffuser inner shell 31, and the plurality of axial diffuser blades 33 define a plurality of diffuser channels 34. Due to the aforementioned structure of the diffuser inner shell 31 and the diffuser outer shell 32, the cross-sectional areas of the multiple diffuser channels 34 on the same cross-section of the diffuser support 3 vary. During the diffusion process, the varying cross-sectional areas of the various diffuser channels result in different flow field states in each channel. This turbulence in the overall flow field reduces noise without affecting the diffusion effect.

[0028] To accommodate the diffuser housing 32, the rear portion of the air hood 1 in this embodiment also has an elliptical cross-section. The front portion of the diffuser housing 32 is sealed to the rear portion of the front air hood 1. The front and middle portions of the air hood 1 can be elliptical, circular, or other shapes depending on design requirements.

[0029] The diffuser inner housing 31 defines a chamber 36 located behind the mounting base 30. The outer rotor digital motor 4 is positioned within this chamber 36. In this embodiment, the outer rotor digital motor 4 is a flat structure comprising a rotating shaft 40. The front portion of the rotating shaft 40 passes through the mounting base 30 and forms an interference fit with the hub 22 of the impeller 2. The impeller 2 rotates with the rotating shaft 40 of the outer rotor digital motor 4. In other embodiments, the outer rotor digital motor can be replaced with other types of motors.

[0030] like Figure 7 As shown, when the working air 5 enters the electric blower from the working air inlet 10 at the front end, it first reaches the impeller 2. Since the impeller 2 is driven to rotate by the outer rotor digital motor 4 at the rear, the impeller 2 does work on the working air 5. Due to the presence of the wind cover 1, the working air 5 will flow to the diffuser bracket 3; when the working air 5 passes through multiple diffuser flow channels 34 with different cross-sections, the flow field states in each diffuser flow channel 34 are different, which reduces noise; the working air 5 then continues to flow to the rear of the diffuser flow channel 34 and finally flows out of the electric blower.

[0031] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. An axial centrifugal electric fan, characterized in that: include: An air hood (1), wherein the front portion of the air hood (1) is provided with a working air inlet (10), the rear portion is open, and the interior of the air hood (1) defines a space (11); A moving impeller (2), the moving impeller (2) being installed in the space (11); A diffuser bracket (3), the diffuser bracket (3) comprising a mounting seat (30), a diffuser flow channel inner shell (31) located outside the mounting seat (30), a diffuser flow channel outer shell (32) located outside the diffuser flow channel inner shell (31), and a plurality of axial diffuser blades (33) located between the diffuser flow channel outer shell (32) and the diffuser flow channel inner shell (31), the plurality of axial diffuser blades (33) being distributed along a circumferential direction, and the diffuser flow channel outer shell (32), the diffuser flow channel inner shell (31), and the plurality of axial diffuser blades (33) defining a plurality of diffuser flow channels (34); The motor (4) comprises a rotating shaft (40), the impeller (2) being mounted on the front portion of the rotating shaft (40) and configured to be driven to rotate by the motor (4); The cross section of the diffuser flow channel outer shell (32) is elliptical, the cross section of the diffuser flow channel inner shell (31) is circular, each of the axial diffuser blades (33) adopts a spatial three-dimensional curved surface, the cross section of at least the rear portion of the wind cover (1) is elliptical, the front portion of the diffuser flow channel outer shell (32) is sealed to the rear portion of the wind cover (1), and on the same cross section of the diffuser bracket (3), the cross-sectional areas of the multiple diffuser flow channels (34) are not completely the same.

2. The axial centrifugal electric fan according to claim 1, characterized in that: The impeller (2) comprises a front wheel disc (20) and a rear wheel disc (23) that are arranged opposite to each other, and a plurality of impeller blades (21) located between the front wheel disc (20) and the rear wheel disc (23).

3. The axial centrifugal electric fan according to claim 1, characterized in that: The interior of the diffuser flow channel inner shell (31) has a chamber (36) located behind the mounting seat (30), the motor (4) is installed in the chamber (36), and the front part of the rotating shaft (40) passes through the mounting seat (30) and is connected to the impeller (2).

4. The axial centrifugal electric fan according to claim 1, characterized in that: The pressure diffuser bracket (3) is an integrated component.

5. The axial centrifugal electric fan according to claim 1, characterized in that: The motor (4) has a flat structure.

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