Wall protection type electronic fan for high-voltage electric friction heat management system and turbulence optimization method of wall protection type electronic fan

Abstract

The invention belongs to the technical field of high-voltage thermal management of electric motorcycles, and particularly relates to a protective wall type electronic fan for a high-voltage electric motorcycle thermal management system and a turbulence optimization method thereof.The protective wall type electronic fan comprises a protective wall used for restraining edge turbulence diffusion, fan blades and a motor used for driving the fan blades, and the fan blades are arranged on the inner side of the protective wall in a sleeving mode; the fan blades are fixedly connected with an output shaft of the motor, the protecting wall is annular, the height of the protecting wall is 10%-15% of the diameter of the fan blades, the fan blades are designed in an asymmetric wing shape, the curvature radius of the front edge of each fan blade is increased by 20%, and a flow guide groove used for guiding air flow to flow in the axial direction is formed in the inner side of the protecting wall. Through the parapet wall structure and fan blade parameter optimization, the turbulence loss is reduced, the heat dissipation efficiency is improved, and the method is applied to the electric motorcycle industry for the first time.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-voltage thermal management of electric motorcycles, and particularly relates to a retaining-wall type electronic fan adapted to 313V / 425V platforms. Background Art

[0002] Traditional electric motorcycle cooling fans have the following problems:

[0003] 1. Insufficient high-voltage compatibility: Ordinary fans are prone to rotational speed fluctuations due to electromagnetic interference under high-voltage platforms, and their insulation performance does not meet the standards.

[0004] 2. Severe turbulent losses: Fan blades without retaining walls generate intense turbulence under the high air volume requirements of high-voltage systems, resulting in air volume losses and increased noise.

[0005] 3. Low heat dissipation efficiency: Existing fan designs are not optimized for the high heat load scenarios of battery pack circuits and cannot meet the fast charging heat dissipation requirements. Summary of the Invention

[0006] The purpose of the present invention is to provide a retaining-wall type electronic fan for a high-voltage electric motorcycle thermal management system and its turbulent flow optimization method. By optimizing the retaining wall structure and blade parameters, turbulent losses are reduced and heat dissipation efficiency is improved, which is the first application in the electric motorcycle industry.

[0007] The technical solutions adopted by the present invention are as follows:

[0008] A retaining-wall type electronic fan for a high-voltage electric motorcycle thermal management system and its turbulent flow optimization method, including a retaining wall for suppressing the diffusion of edge turbulence, fan blades, and a motor for driving the fan blades. The fan blades are sleeved inside the retaining wall, and the fan blades are fixedly connected to the output shaft of the motor.

[0009] Further, the retaining wall is annular, and the height of the retaining wall is 10% - 15% of the diameter of the fan blades.

[0010] Further, the fan blades adopt an asymmetric airfoil design, and the leading edge curvature radius is increased by 20%.

[0011] Further, a flow guiding groove for guiding the airflow to flow axially is arranged inside the retaining wall.

[0012] Further, vortex generators are added at the roots of the fan blades.

[0013] A turbulent flow optimization method for a retaining-wall type electronic fan for a high-voltage electric motorcycle thermal management system is: By optimizing the retaining wall structure and blade parameters, turbulent losses are reduced and heat dissipation efficiency is improved.

[0014] The technical effects achieved by the present invention are:

[0015] 1. High-voltage safety: Passed UL certification, insulation resistance ≥ 100 MΩ, leakage current ≤ 0.5 mA;

[0016] 2. Energy efficiency improvement: At 3800 RPM, the air pressure of the wall-mounted model (18543-1) is increased to 22.8 mmAq, and the turbulent loss is reduced by 40%;

[0017] 3. Noise control: The wall-mounted structure reduces the aerodynamic noise by 15 dB(A), meeting the ISO 362 standard.

[0018] Through the optimization of the wall-mounted structure and fan blade parameters, the present invention reduces the turbulent loss and improves the heat dissipation efficiency, which is the first application in the electric motorcycle industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the front view structural schematic diagram of the present invention;

[0020] Figure 2 is the rear view structural schematic diagram of the present invention;

[0021] Figure 3 is the model diagram of the non-wall-mounted and wall-mounted models

[0022] Figure 4 is the PQ performance comparison curve graph of the non-wall-mounted and wall-mounted models;

[0023] Figure 5 is the turbulent kinetic energy curve graph of the non-wall-mounted and wall-mounted models.

[0024] In the drawings, the list of components represented by each reference numeral is as follows:

[0025] 1. Wall; 2. Fan blade; 3. Motor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] In order to make the objectives and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with the embodiments. It should be understood that the following text is only used to describe one or several specific implementation manners of the present invention, and does not strictly limit the specific scope of protection claimed by the present invention.

[0027] As Figures 1-5 shown, a wall-mounted electric fan for a high-voltage electric motorcycle thermal management system and its turbulent flow optimization method include a wall 1 for suppressing the edge turbulent diffusion, a fan blade 2, and a motor 3 for driving the fan blade 2. The fan blade 2 is sleeved inside the wall 1, and the fan blade 2 is fixedly connected to the output shaft of the motor 3. The motor 3 winding uses three-layer insulated enameled wire and is encapsulated by a UL94V-0 grade flame-retardant plastic shell, with a withstand voltage level ≥ 500V. The control module integrates an EMC filter to reduce the influence of high-voltage electromagnetic interference on the rotational speed stability.

[0028] The retaining wall 1 is annular, and the height of the retaining wall 1 is 10% - 15% of the diameter of the fan blade 2. The annular retaining wall 1 inhibits the diffusion of edge turbulence.

[0029] The fan blade 2 adopts an asymmetric airfoil design, and the leading-edge curvature radius is increased by 20% to reduce the risk of air flow separation.

[0030] A flow guiding groove for guiding the air flow to flow axially is arranged inside the retaining wall 1. The flow guiding groove guides the air flow to flow axially, and the turbulent kinetic energy is reduced by 30% (supported by simulation data).

[0031] Eddy current generators are added to the root of the fan blade 2 to improve the wind pressure uniformity in the low-speed range.

[0032] A method for optimizing the turbulence of the retaining wall 1 type electronic fan for the high-voltage electric motorcycle thermal management system is: by optimizing the structure of the retaining wall 1 and the parameters of the fan blade 2, reducing the turbulent loss and improving the heat dissipation efficiency.

[0033] Example 1:

[0034] For the PQ performance of two types of fan blades 2 of the 18543 model and the simulation analysis of the operating points under a given module, study the PQ performance of the two types of fan blades 2 at a speed of 3800 RPM, and obtain the fan wind direction, operating points (air volume and wind pressure) under the given module and the influence on the engine front panel;

[0035] Use ANSYS / Fluent software for simulation analysis, with a mesh size of 0.5 - 20 mm and a mesh Inverse Orthogonal Quality of 0.43 - 0.86.

[0036] Example 2:

[0037] For the PQ performance simulation of two types of fan blades 2 of the 18543 model, obtain the PQ performance curve (attached Figure 4 ), the PQ performance and torque of the model with the retaining wall 1 are slightly lower than those of the model without the retaining wall 1;

[0038] Basic settings: Use Fluent software for analysis, with 1.31 million meshes, the minimum orthogonal quality of the meshes is about 0.20, the SST-k-omega turbulence model is adopted, the unit area condition: Frame motion, speed 3800 RPM; boundary conditions: pressure inlet, pressure outlet; algorithm: Coupled algorithm, calculation step 2000 steps.

[0039] Example 3:

[0040] For the operating point simulation of two types of fan blades 2 of the 18543 model under a given module, obtain the fan wind direction, operating points (air volume and wind pressure) under the given module and the influence on the engine front panel (attached Figure 5) Working point of 18543-1 (89.9 CFM, 22.8 mmAq), working point of 18543-2 (214.48 CFM, 16 mmAq). Prediction of the reason for the working point deviation: In the case of Plan 1 without a retaining wall, the turbulent flow develops more violently under the given module, resulting in a large energy loss, which causes the working point of the fan to move forward and the air output to be insufficient.

[0041] Basic settings: Analyzed using Fluent software, with 5.54 million grids, the minimum orthogonal quality of the grids is about 0.20, the SST-k-omega turbulence model is adopted, unit area condition: Frame motion, rotational speed 3800 RPM; boundary conditions: pressure inlet, pressure outlet; algorithm: Coupled algorithm, 2000 calculation steps.

[0042] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. A wall-protected electronic fan for a high-voltage electric heat management system, comprising a wall (1) for suppressing edge turbulence diffusion, a fan blade (2) and a motor (3) for driving the fan blade (2), characterized in that: The fan blades (2) are sleeved on the inner side of the guard wall (1), and the fan blades (2) are fixedly connected to the output shaft of the motor (3).

2. A wall-protecting electronic fan for a high-voltage electric motorcycle thermal management system according to claim 1, characterized in that: The guard wall (1) is annular, and the height of the guard wall (1) is 10% to 15% of the diameter of the fan blade (2).

3. The wall-protecting electronic fan for a high-voltage electric motorcycle thermal management system according to claim 1, characterized in that: The fan blade (2) adopts an asymmetric airfoil design, and the leading edge curvature radius is increased by 20%.

4. The wall-protecting electronic fan for a high-voltage electric motorcycle thermal management system according to claim 1, characterized in that: A guide groove for guiding airflow to flow in the axial direction is arranged on the inner side of the guard wall (1).

5. The wall-protecting electronic fan for a high-voltage electric motorcycle thermal management system according to claim 1, characterized in that: A vortex generator is additionally provided at the root of the fan blade (2).

6. A turbulence optimization method for a wall-guard type electronic fan used in a high-voltage electric motor thermal management system is: by optimizing the wall (1) structure and the fan blade (2) parameters, turbulence loss is reduced and heat dissipation efficiency is improved.

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