High-speed motor duct casing capable of reducing pneumatic noise

Abstract

The utility model discloses a high-speed motor ducted casing capable of reducing pneumatic noise, which comprises an inner casing and an outer casing, a guide vane is arranged between the inner casing and the outer casing, the end part of an air outlet of the guide vane is of a special-shaped structure, the end part of the air outlet of the guide vane is provided with a convex part and a concave part adjacent to the convex part, and the convex part and the concave part are arranged on the inner casing and the outer casing respectively. The end part of an air outlet in an existing duct shell is redesigned to be in a straight edge strip shape, and the convex parts and the concave parts are uniformly arranged at intervals, so that a local flow guide effect is achieved, the air speed and the air pressure difference in two adjacent air ducts are reduced, the phenomenon of serious vortex caused by the straight edge strip at the end part of the air outlet under the condition of high-speed airflow is reduced, and the service life of the duct shell is prolonged. And meanwhile, the whole guide vane adopts the Archimedes spiral design, so that the technical problems of serious vortex phenomenon and large pneumatic noise of an air outlet of a high-speed fan duct shell in the prior art are solved, and the guide vane has the beneficial effects of high air outlet efficiency and small pneumatic noise.

Description

Technical Field

[0001] The utility model relates to the technical field of high-speed motor accessories, in particular to a high-speed motor ducted housing that can reduce pneumatic noise. Background Art

[0002] A ducted motor is an improved type of fan, and its main advantage lies in the adoption of the structure of a ducted impeller. Different from an ordinary centrifugal impeller, the ducted impeller is composed of several arc-shaped blades, forming a streamlined air passage at the inlet and a high-speed air current at the outlet, so as to achieve higher air pressure and air volume. In a fan system, a ducted housing is required to fix core components such as a stator-rotor assembly, use the duct to gather air, and reduce the energy loss of the tip vortex of the fan blades; under a certain specific working condition, the efficiency of the entire power system can be improved, better overall machine performance can be obtained, the tip vortex of the fan blades is reduced, the energy consumption is reduced, and at the same time the airflow noise is also greatly reduced. The ducted housing often includes a multi-group guide vane design, and the air outlet of the guide vane is mostly in the shape of a straight edge. When high-speed gas flows through the ducted guide vane, due to the certain thickness of the guide vane, a negative pressure area will be formed at the air outlet of the guide vane, generating a vortex effect. Because the high-speed air flow generated by the fan has non-uniform characteristics, the wind speed and air pressure in two adjacent air ducts will be different, which will cause a large vortex to be generated at the air outlet of the guide vane, and at the same time generate vortex noise. In the case of high-speed air flow, a phenomenon similar to the von Karman vortex will even occur, resulting in high pneumatic noise and unstable air flow. Summary of the Utility Model

[0003] In order to overcome the shortcomings and deficiencies of the prior art, the utility model provides a high-speed motor ducted housing that can reduce pneumatic noise, and solves the technical problems of serious vortex phenomenon and high pneumatic noise at the air outlet of the ducted housing of a high-speed fan in the prior art.

[0004] The utility model realizes the above purpose through the following technical solutions: a high-speed motor ducted housing that can reduce pneumatic noise, including an inner housing and an outer housing, a guide vane is arranged between the inner housing and the outer housing, the air outlet end of the guide vane is of a special-shaped structure, and the air outlet end of the guide vane has a convex part and a concave part adjacent to the convex part.

[0005] Preferably, the air outlet end of the guide vane has a plurality of the convex parts and the concave parts, and the convex parts and the concave parts are evenly distributed.

[0006] Preferably, the convex part and the concave part adjacent to the convex part are arranged in central symmetry.

[0007] Preferably, the connecting line of the ends of the convex part and the concave part is serrated.

[0008] Preferably, the connecting line of the ends of the protruding part and the concave part is wavy.

[0009] Preferably, the guide vane is an Archimedean spiral blade along the axial direction of the duct housing from the air inlet to the air outlet.

[0010] Preferably, the cavity surrounded by the inner shell includes a stator assembly installation cavity, a bearing chamber and a blade chamber.

[0011] Preferably, there are multiple groups of the guide vanes, and the guide vanes are evenly spaced around the central axis of the inner shell and the outer shell.

[0012] Compared with the prior art, the beneficial effects obtained by the present utility model are as follows:

[0013] A high-speed motor duct housing capable of reducing pneumatic noise disclosed by the present utility model includes an inner shell and an outer shell. A guide vane is arranged between the inner shell and the outer shell. The air outlet end of the guide vane is a special-shaped structure. The air outlet end of the guide vane has a protruding part and a concave part adjacent to the protruding part. The straight edge shape of the air outlet end in the existing duct housing is redesigned, and the protruding part and the concave part are arranged at uniform intervals, which plays a role in local flow guiding, reduces the wind speed and the wind pressure difference in two adjacent air ducts, and reduces the serious eddy current phenomenon caused by the straight edge at the air outlet end in the case of high-speed air flow. At the same time, the guide vane as a whole adopts an Archimedean spiral design, which solves the technical problems of serious eddy current phenomenon and large pneumatic noise at the air outlet of the high-speed fan duct housing in the prior art, and has the beneficial effects of high air outlet efficiency and low pneumatic noise. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0015] Figure 1 A side view of a high-speed motor duct housing capable of reducing pneumatic noise according to the present utility model is shown.

[0016] Figure 2 A cross-sectional view of a high-speed motor duct housing capable of reducing pneumatic noise according to the present utility model is shown.

[0017] Reference numerals: 1 - inner shell; 2 - outer shell; 3 - guide vane; 31 - air outlet end; 311 - protruding part; 312 - concave part. Detailed Embodiments

[0018] The present utility model will be further described below in conjunction with the accompanying drawings of the specification and specific embodiments. However, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0019] Embodiment 1

[0020] Please refer to the appendix Figure 1 to the appendix Figure 2 to , a high-speed motor duct housing capable of reducing pneumatic noise, including an inner housing 1 and an outer housing 2. A flow guiding vane 3 is arranged between the inner housing 1 and the outer housing 2. There are nine groups of the flow guiding vanes 3, and the flow guiding vanes 3 are evenly spaced around the central axis of the inner housing 1 and the outer housing 2. The flow guiding vanes 3 are Archimedean spiral blades along the axial direction of the duct housing from the air inlet to the air outlet. The air outlet end 31 of the flow guiding vane 3 is a special-shaped structure. The air outlet end 31 of the flow guiding vane 3 has a convex portion 311 and a concave portion 312 adjacent to the convex portion. The air outlet end 31 of the flow guiding vane 3 has three groups of evenly distributed convex portions 311 and concave portions 312. The convex portion 311 and the concave portion 312 adjacent to the convex portion are centrosymmetrically arranged. The end connection line of the convex portion 311 and the concave portion 312 is serrated; the cavity surrounded by the inner housing 1 includes a stator assembly installation cavity, a bearing chamber and a fan blade cavity. The inner housing 1 is an integral structure. The stator assembly, the rotor bearing and the motor moving fan blade are accommodated in the cavity surrounded by the inner housing 1. The inner housing 1 is an integrally formed integral structure. Therefore, the concentricity of the stator assembly, the rotor bearing and the motor moving fan blade is good, and the concentricity value is not greater than 0.02 mm. The good concentricity design can make the gap between the fan blade tip and the wall surface of the fan blade cavity very small, greatly reducing the eddy current loss at the fan blade tip, improving the performance of the fan and reducing the eddy current loss at the fan blade tip. The concentricity of the rotor and the stator is good, the rotor air gap is uniform, and the air gap magnetic field is also evenly distributed. The good even distribution of the air gap magnetic field will reduce the cogging torque and the electromagnetic torque fluctuation, and reduce the electromagnetic noise.

[0021] Embodiment 2

[0022] Please refer to the appendix Figure 1 to the appendix Figure 2A high-speed motor duct casing capable of reducing aerodynamic noise comprises an inner casing 1 and an outer casing 2, wherein guide blades 3 are arranged between the inner casing 1 and the outer casing 2, wherein the guide blades 3 are nine groups, and the guide blades 3 are evenly spaced around the central axis of the inner casing 1 and the outer casing 2, wherein the guide blades 3 are Archimedean spiral blades from the air inlet to the air outlet along the axial direction of the duct casing, and the air outlet end 31 of the guide blade 3 is a special-shaped structure, wherein the air outlet end 31 of the guide blade 3 has a protrusion 311 and a recessed portion 312 adjacent to the protrusion, and the air outlet of the guide blade 3 The end 31 has three groups of evenly distributed protrusions 311 and recesses 312, the protrusions 311 and the recesses 312 adjacent to the protrusions are centrally symmetrically arranged, the end connecting line of the protrusions 311 and the recesses 312 is wavy, and the wavy shape can specifically be a sine-cosine curve or other wavy shapes. The cavity surrounded by the inner shell 1 includes a stator assembly mounting cavity, a bearing chamber and a fan blade cavity. The inner shell 1 is an integral structure, and the stator assembly, rotor bearing and motor fan blades are accommodated in the cavity surrounded by the inner shell 1. The inner shell 1 is an integral structure formed in one piece.

[0023] The above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and there are many similar modifications. All modifications that can be directly derived or associated with the contents disclosed by ordinary technicians in this field should be considered as the scope of protection of the present invention.

Claims

1. A high-speed motor ducted housing capable of reducing aerodynamic noise, characterized in that: The invention comprises an inner shell (1) and an outer shell (2), wherein a guide vane (3) is arranged between the inner shell (1) and the outer shell (2), wherein an air outlet end (31) of the guide vane (3) is a special-shaped structure, and the air outlet end (31) of the guide vane (3) comprises a protruding portion (311) and a recessed portion (312) adjacent to the protruding portion.

2. The high-speed motor ducted housing capable of reducing aerodynamic noise as claimed in claim 1, characterized in that: The air outlet end (31) of the guide blade (3) has a plurality of the raised portions (311) and the recessed portions (312), and the raised portions (311) and the recessed portions (312) are evenly distributed.

3. The high-speed motor ducted housing capable of reducing aerodynamic noise as claimed in claim 1, characterized in that: The raised portion (311) and the recessed portion (312) adjacent to the raised portion are arranged in a centrally symmetrical manner.

4. The high-speed motor ducted housing capable of reducing aerodynamic noise as claimed in claim 1, characterized in that: The line connecting the ends of the raised portion (311) and the recessed portion (312) is in a sawtooth shape.

5. The high-speed motor ducted housing capable of reducing aerodynamic noise as claimed in claim 1, characterized in that: The line connecting the ends of the convex portion (311) and the concave portion (312) is wavy.

6. The high-speed motor ducted housing capable of reducing aerodynamic noise as claimed in claim 1, characterized in that: The guide blade (3) is an Archimedean spiral blade along the axial direction of the duct casing from the air inlet to the air outlet.

7. The high-speed motor ducted housing capable of reducing aerodynamic noise as claimed in claim 1, characterized in that: The cavity enclosed by the inner shell (1) comprises a stator assembly installation cavity, a bearing chamber and a fan blade cavity, and the inner shell (1) is an integral structure.

8. The high-speed motor ducted housing capable of reducing aerodynamic noise as claimed in claim 1, characterized in that: The guide blades (3) are in a plurality of groups, and the guide blades (3) are evenly spaced and distributed around the central axis of the inner shell (1) and the outer shell (2).

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