Visual experiment platform for internal flow of oil-cooled motor stator and oil injection ring flow channel

Abstract

The invention provides a visual experiment platform for internal flow of an oil-cooled motor stator and an oil injection ring flow channel, a relatively visual experiment system and means are designed for a complete cooling flow channel in a motor, and the internal flow form of the cooling flow channel of the motor can be comprehensively observed through a high-speed camera; therefore, the motion characteristics and the dynamic characteristics of the fluid in the motor cooling system are obtained. In cooperation with a measuring element and a particle image velocity measurement technology, various fluidity parameters such as speed, acceleration, pressure, turbulence, vorticity, pressure loss and the like in the stator core and the oil injection ring flow channel can be further obtained, the heat dissipation characteristic rule of the motor cooling system can be objectively and accurately analyzed, and improvement and optimization of the cooling system structure are guided.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric drive of new energy vehicles, and in particular relates to an experimental platform for visualizing the internal flow of an oil-cooled motor stator and an oil injection circulation channel. Background Art

[0002] Since the working conditions of the motor change frequently during operation, a large amount of heat will be generated, which will increase the temperature of the motor, and then reduce the life and safety of the motor. Therefore, the temperature rise and thermal management of the motor are key issues in the current development of motors. The existing heat dissipation system suitable for drive motors mainly adopts a liquid cooling system. The flow characteristics of the liquid in the system are closely related to the heat dissipation characteristics. If the flow state of the fluid in the heat dissipation cooling structure can be clarified, it will help to better control its heat dissipation characteristics. However, there are few visualization experimental platforms for the internal fluidity of the motor cooling channel in the prior art. Although some related studies provide visualization research schemes for the cooling channel at positions such as motor windings and ends, they are only designed for the local part of the motor, and it is impossible to achieve a comprehensive observation of the flow morphology in the overall cooling channel inside the motor. Therefore, it is impossible to obtain specific flow data including velocity, acceleration, pressure, turbulence, vorticity, pressure loss, etc. at key positions inside the motor, such as the stator core and the injection ring. These parameters are crucial to reflect the relationship between the flow characteristics of the cooling fluid and the heat dissipation, guide the optimization of the cooling system structure, and efficiently and stably control the heat dissipation effect. Therefore, how to provide a visualization experimental platform for the internal flow of motor cooling channels for in-depth research and detailed analysis of the motion characteristics and dynamic characteristics of the fluid is a technical problem that urgently needs to be solved in this field. Summary of the invention

[0003] In view of this, in order to solve the technical problems existing in this field, the present invention provides an oil-cooled motor stator and oil injection circulation channel internal flow visualization experimental platform, which is composed of the internal flow system of the stator core and the oil injection circulation channel, a high-speed full flow field display system and a stator;

[0004] Among them, the internal flow system of the oil injection ring flow channel includes a motor experimental device, a fluid measuring element, a pipeline, a pump, an oil tank and a support frame; the motor experimental device is composed of a transparent casing, a transparent oil injection ring and a stator core; the transparent casing is provided with a cooling fluid inlet connected to the pipeline, and a cooling fluid outlet connected to the oil tank; the oil injection ring and the stator core are both arranged in the transparent casing; the cooling pipeline is connected to the pump, and the pump is used to input cooling fluid into the motor experimental device through the pipeline and the cooling fluid inlet, so that the cooling fluid flows inside the motor experimental device to dissipate heat, and then is discharged into the oil tank through the cooling fluid outlet; the fluid measuring element is arranged on the pipeline, and is used to measure various flow parameters of the cooling fluid;

[0005] The high-speed full-flow field display system consists of a high-speed camera and an illumination light source; the high-speed camera is used to collect the overall cooling fluid flow process image inside the motor experimental device, and the illumination light source is used to illuminate the motor experimental device during the experiment.

[0006] Furthermore, the motor experimental device is specifically arranged on a support frame, and the oil tank is arranged on the experimental platform base below the motor experimental device; the pump and the high-speed camera are also arranged on the experimental platform base; the relative positions of the high-speed camera and the lighting light source and the motor experimental device are adjustable, so as to collect cooling fluid images in different directions.

[0007] Furthermore, the fluid measuring element specifically adopts any one of a flow meter, a thermocouple, and a pressure gauge, or a combination thereof.

[0008] Furthermore, the cooling fluid is specifically a pigment-marked liquid to improve the contrast and clarity of image acquisition.

[0009] Furthermore, tracer particles are added to the cooling fluid and a laser is added to generate a light sheet during the experiment. A high-speed camera is used to capture the flow image of the tracer particles inside the motor cooling channel. The particle image velocimetry technology PIV is then used to calculate detailed flow field information including velocity field and eddy current field.

[0010] Furthermore, two oil injection rings are specifically arranged in the motor experimental device, and the stator core is arranged between the two oil injection rings.

[0011] Furthermore, the transparent housing, the transparent oil injection ring and the stator core are all made of acrylic material, and the three together form a fully transparent integrated structure.

[0012] The above-mentioned oil-cooled motor stator and oil injection ring flow visualization experimental platform provided by the present invention has designed a more intuitive experimental system and means for the complete cooling flow channel inside the motor. The flow morphology inside the motor cooling flow channel can be comprehensively observed by a high-speed camera to obtain the motion characteristics and dynamic characteristics of the fluid in the motor cooling system. In combination with measuring elements and particle image velocimetry technology, various flow parameters such as velocity, acceleration, pressure, turbulence, vorticity, pressure loss, etc. inside the stator core and the oil injection ring flow channel can be further obtained, which is helpful for objectively and accurately analyzing the heat dissipation characteristics of the motor cooling system and guiding the improvement and optimization of the cooling system structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of the structure of the experimental platform provided by the present invention;

[0014] Figure 2 This is an optional structural diagram of a motor experimental device with double oil injection rings. DETAILED DESCRIPTION

[0015] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] The present invention provides an oil-cooled motor stator and an oil injection circulation channel internal flow visualization experimental platform, such as Figure 1 As shown, it consists of an internal flow system of a stator core and an injection flow channel, a high-speed full flow field display system, and a stator;

[0019] Among them, the internal flow system of the oil injection ring flow channel includes a motor experimental device 1, a fluid measuring element 6, a pipeline 4, a pump 5, an oil tank 9 and a support frame 2; the motor experimental device 1 is composed of a transparent casing 11, an oil injection ring 12 and a stator core 10; the transparent casing 11 is provided with a cooling fluid inlet 9 connected to the pipeline 4, and a cooling fluid outlet 13 connected to the oil tank 3; the oil injection ring 12 and the stator core 10 are both arranged in the transparent casing 11; the cooling pipeline 4 is connected to the pump 5, and the pump 5 is used to input cooling fluid into the motor experimental device 1 through the pipeline 4 and the cooling fluid inlet 9, so that the cooling fluid flows inside the motor experimental device to dissipate heat, and then is discharged into the oil tank 3 through the cooling fluid outlet 13; the fluid measuring element 6 is arranged on the pipeline 4, and is used to measure various flow parameters of the cooling fluid;

[0020] The high-speed full-flow field display system is composed of a high-speed camera 8 and an illumination light source 7; the high-speed camera 8 is used to collect the overall cooling fluid flow process image inside the motor experimental device 1, and the illumination light source 7 is used to illuminate the motor experimental device 1 during the experiment.

[0021] In a preferred embodiment of the present invention, the motor experimental device 1 is specifically arranged on a support frame, and the oil tank 3 is arranged on the experimental platform base below the motor experimental device 1; the pump 5 and the high-speed camera 8 are also arranged on the experimental platform base; the relative positions of the high-speed camera 8 and the lighting source 7 and the motor experimental device 1 are adjustable, so as to realize all-round acquisition of the cooling fluid image on the right, left, square, rear, oblique, as well as overall and partial.

[0022] In a preferred embodiment of the present invention, the fluid measuring element 6 specifically adopts any one of a flow meter, a thermocouple, and a pressure gauge, or a combination thereof, to measure the flow, temperature, and pressure values ​​at key locations such as the motor inlet, the injection ring, the injection hole, the internal flow channel of the stator core, and the motor outlet.

[0023] In a preferred embodiment of the present invention, the cooling fluid is specifically a pigment-marked liquid to improve the contrast and clarity of image acquisition.

[0024] In a preferred embodiment of the present invention, tracer particles are added to the cooling fluid and a laser is additionally provided to generate a light sheet during the experiment, and a high-speed camera is used to acquire the flow image of the tracer particles inside the cooling channel of the motor. The particle image velocimetry technology PIV is then used to calculate detailed flow field information including velocity field and eddy current field.

[0025] In order to realize the experimental analysis of different cooling system structures, in a preferred embodiment of the present invention, Figure 2 As shown, two oil injection rings 12 are specifically provided in the motor experimental device 1, and the stator core 10 is provided between the two oil injection rings.

[0026] In a preferred embodiment of the present invention, the transparent housing, the transparent oil injection ring and the stator core are all made of acrylic material, and the three together form a fully transparent integrated structure.

[0027] When using the visualization experiment platform provided by the present invention, the high-speed camera and the light source can be first set on the left side of the motor experiment device, and the lights can be set on both sides of the upper oblique side of the motor experiment device. The corresponding flow value can be set by the pump, and the flow value can be monitored by the flow meter. The fluid is transported by the pipeline to the inlet of the motor experiment device. At the same time, the image of the fluid flow process inside the motor stator core and the injection ring flow channel is collected by the high-speed camera, and the pressure value, temperature, and flow information of the measuring point are recorded during the experiment. The flow state of the fluid inside the motor is observed frame by frame, and the flow pattern, velocity field, and pressure field distribution law of the internal fluid during the operation of the motor are analyzed.

[0028] After adding tracer particles to the cooling fluid, images of the tracer particle flow process inside the motor are captured with a high-speed camera. Cross-correlation analysis is performed on two adjacent images to obtain transient velocity vector information, and detailed flow field information such as velocity field and eddy current field is calculated.

[0029] It should be understood that the size of the serial numbers of the steps in the embodiment of the present invention does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Visualization experimental platform for internal flow of oil-cooled motor stator and oil injection circulation channel, characterized by: It consists of the internal flow system of the stator core and the injection flow channel, the high-speed full flow field display system and the stator; Among them, the internal flow system of the oil injection ring flow channel includes a motor experimental device, a fluid measuring element, a pipeline, a pump, an oil tank and a support frame; the motor experimental device is composed of a transparent casing, a transparent oil injection ring and a stator core; the transparent casing is provided with a cooling fluid inlet connected to the pipeline, and a cooling fluid outlet connected to the oil tank; the oil injection ring and the stator core are both arranged in the transparent casing; the cooling pipeline is connected to the pump, and the pump is used to input cooling fluid into the motor experimental device through the pipeline and the cooling fluid inlet, so that the cooling fluid flows inside the motor experimental device to dissipate heat, and then is discharged into the oil tank through the cooling fluid outlet; the fluid measuring element is arranged on the pipeline, and is used to measure various flow parameters of the cooling fluid; The high-speed full-flow field display system consists of a high-speed camera and an illumination light source; the high-speed camera is used to collect the overall cooling fluid flow process image inside the motor experimental device, and the illumination light source is used to illuminate the motor experimental device during the experiment.

2. The oil-cooled motor stator and oil injection circulation channel internal flow visualization experimental platform according to claim 1, characterized in that: The motor experimental device is specifically arranged on a support frame, and the oil tank is arranged on the experimental platform base below the motor experimental device; the pump and the high-speed camera are also arranged on the experimental platform base; the relative positions of the high-speed camera and the illumination light source and the motor experimental device are adjustable, so as to collect cooling fluid images in different directions.

3. The oil-cooled motor stator and oil injection circulation channel internal flow visualization experimental platform according to claim 1, characterized in that: The fluid measuring element specifically adopts any one of a flow meter, a thermocouple, and a pressure gauge, or a combination of several of them.

4. The oil-cooled motor stator and oil injection circulation channel internal flow visualization experimental platform according to claim 1, characterized in that: The cooling fluid is specifically a pigmented liquid to increase the contrast and clarity of image acquisition.

5. The oil-cooled motor stator and oil injection circulation channel internal flow visualization experimental platform according to claim 1, characterized in that: Tracer particles are added to the cooling fluid and a laser is added to generate a light sheet during the experiment. A high-speed camera is used to capture the flow image of the tracer particles inside the motor cooling channel. The particle image velocimetry technology (PIV) is then used to calculate detailed flow field information including velocity field and eddy current field.

6. The oil-cooled motor stator and oil injection circulation channel internal flow visualization experimental platform according to claim 1, characterized in that: Two oil injection rings are specifically arranged in the motor experimental device, and the stator core is arranged between the two oil injection rings.

7. The oil-cooled motor stator and oil injection circulation channel internal flow visualization experimental platform according to claim 1, characterized in that: The transparent casing, transparent oil injection ring and stator core are all made of acrylic material, and the three together form a fully transparent integrated structure.

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