A motor stator cooling assembly for a magnetic levitation flywheel energy storage device

Abstract

The application discloses a kind of motor stator cooling components of magnetic suspension flywheel energy storage equipment, belong to magnetic suspension flywheel energy storage equipment technical field, including stator core, the outer wall side end of stator core is equipped with cooling jacket for heat dissipation, stator core and cooling jacket are provided with sealing assembly between upper and lower sides, the inside of cooling jacket is provided with the heat dissipation mechanism for the heat dissipation of stator core, in the application, by setting several guide vanes or annular inclined guide vanes in the annular cooling cavity of cooling jacket, the annular cooling cavity is divided into several independent cooling flow channels, and simultaneously, cooling liquid is evenly distributed into each cooling flow channel by shunt pipe group, so that the cooling liquid can flow uniformly along the cooling flow channel, avoiding the occurrence of local flow dead angle, effectively solve the problem of uneven temperature distribution of each part of stator core existing in the prior art cooling component, to prevent the occurrence of local overheating phenomenon.

Description

Technical Field

[0001] This invention relates to the field of magnetic levitation flywheel energy storage equipment technology, and specifically to a motor stator cooling assembly for a magnetic levitation flywheel energy storage equipment. Background Technology

[0002] Magnetic levitation flywheel energy storage equipment is an energy storage device that uses magnetic levitation bearings to support the high-speed rotation of a flywheel, converting electrical energy into mechanical energy for storage, and then converting the mechanical energy back into electrical energy for release when needed. It has advantages such as high energy density, fast response speed, long service life, and environmental friendliness, and is widely used in new energy power generation, power grid peak shaving and frequency regulation, rail transit and other fields.

[0003] The motor is one of the core components of the magnetic levitation flywheel energy storage device. During operation, its stator generates a large amount of heat due to electromagnetic induction. If the heat cannot be dissipated in time, the temperature of the stator winding will rise, which will not only reduce the working efficiency of the motor, but also accelerate the aging of the insulation material, shorten the service life of the motor, and in severe cases, even cause the stator winding to burn out, affecting the normal operation of the magnetic levitation flywheel energy storage device.

[0004] In existing technologies, the cooling methods for the stator of the motor in magnetic levitation flywheel energy storage devices mainly include natural cooling, air cooling, and liquid cooling. Natural cooling and air cooling have low cooling efficiency and are difficult to meet the cooling requirements of the stator of high-power magnetic levitation flywheel energy storage devices; liquid cooling, due to its high cooling efficiency, is gradually becoming the mainstream cooling method. However, existing liquid cooling components have the following defects: First, the cooling channel design is unreasonable, and the flow of coolant in the cooling chamber is uneven, resulting in uneven temperature distribution in different parts of the stator core and local overheating. Therefore, there are still shortcomings.

[0005] In conclusion, it is necessary to invent a motor stator cooling assembly for a magnetic levitation flywheel energy storage device. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention provides a stator cooling assembly for a magnetic levitation flywheel energy storage device motor, which solves the problem of uneven temperature distribution and local overheating caused by unreasonable cooling channel design and uneven flow of coolant in the cooling chamber.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a stator cooling assembly for a magnetic levitation flywheel energy storage device, comprising a stator core, wherein a cooling sleeve for heat dissipation is fitted on the outer wall side of the stator core, and a sealing assembly is provided on the upper and lower sides between the stator core and the cooling sleeve, and a heat dissipation mechanism for heat dissipation of the stator core is provided inside the cooling sleeve.

[0008] Preferably, the sealing assembly includes two sets of sealing rings, each of which is fixed at the upper and lower sides of the opposite side of the inner wall of the stator core and the cooling jacket where they need to fit together.

[0009] Preferably, the heat dissipation mechanism is an annular cooling cavity, which is located inside the cooling sleeve, and multiple guide plates are fixed inside the annular cooling cavity.

[0010] Preferably, the multiple guide plates are evenly arranged in a ring array, and the interior of the ring cooling cavity is divided into several axial cooling channels by the guide plates.

[0011] Preferably, the inner wall side ends of the axial cooling channel are all fixed with heat dissipation protrusions to improve the heat exchange and cooling effect, and the multiple heat dissipation protrusions are evenly arranged in an array on the inner wall side ends of the axial cooling channel.

[0012] Preferably, the heat dissipation protrusion has a triangular cross-sectional shape, the outer shape of the heat dissipation protrusion is adapted to the shape of the axial cooling channel, and the height of the guide plate is adapted to the height of the annular cooling cavity.

[0013] Preferably, a first liquid inlet manifold and a first liquid outlet manifold are respectively fitted on the upper and lower sides of the outer wall of the cooling sleeve. The inner wall of the first liquid inlet manifold is fixed to the bottom of the outer wall side end of the cooling sleeve, and the inner wall of the first liquid outlet manifold is fixed to the upper part of the outer wall side end of the cooling sleeve.

[0014] Preferably, a first inlet branch pipe is fixed to the inner wall side of the first liquid inlet main pipe at a position corresponding to each of the axial cooling channels. The end of the first liquid inlet branch pipe away from the first liquid inlet main pipe is fixedly connected to the bottom of the inner wall side of the axial cooling channel. A first drain branch pipe is fixed to the inner wall side of the first drain main pipe at a position corresponding to each of the axial cooling channels. The end of the first drain branch pipe away from the first drain main pipe is fixedly connected to the top of the inner wall side of the axial cooling channel. A temperature sensor is fixedly installed on the outer wall side of the cooling jacket at a position corresponding to each axial cooling channel.

[0015] Preferably, the heat dissipation mechanism is an annular cooling cavity, which is located inside the cooling sleeve. The inner walls of the annular cooling cavity are uniformly arranged with annular inclined guide plates in an array. The annular inclined guide plates are arranged with the left side higher than the right side. A flow-slowing baffle is fixed between the upper and lower annular inclined guide plates.

[0016] Preferably, a second liquid inlet main pipe is fixed to the right side of the outer wall of the cooling jacket, and a second liquid inlet branch pipe is fixedly connected to the inner wall side of the second liquid inlet main pipe and between each of the annular inclined guide plates. A second liquid outlet main pipe is fixed to the left side of the outer wall of the cooling jacket, and a second liquid outlet branch pipe is fixedly connected to the inner wall side of the second liquid outlet main pipe and between each of the annular inclined guide plates.

[0017] The beneficial effects of this invention are: In this invention, by setting several guide plates or annular inclined guide plates in the annular cooling cavity of the cooling jacket, the annular cooling cavity is divided into several independent cooling channels. At the same time, the coolant is evenly distributed to each cooling channel through the distribution pipe group, so that the coolant can flow evenly along the cooling channel and avoid local dead zones. This effectively solves the problem of uneven temperature distribution in different parts of the stator core in existing cooling assemblies and prevents local overheating. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external structure of the device in Embodiment 1 of the present invention, viewed from the front. Figure 2 This is a partial cross-sectional view of the device in Embodiment 1 of the present invention from the front view direction; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A; Figure 4 This is a partial structural schematic diagram of the cooling jacket in the top view of Embodiment 1 of the present invention; Figure 5 This is a three-dimensional structural diagram of the heat dissipation protrusion in Embodiment 1 of the present invention; Figure 6 This is a partial cross-sectional view of the cooling jacket in the front view of Embodiment 2 of the present invention.

[0019] In the diagram: 100, stator core; 110, sealing ring; 200, cooling jacket; 210, heat dissipation ridge; 220, first liquid inlet main pipe; 221, first liquid inlet branch pipe; 230, first liquid outlet main pipe; 231, first liquid outlet branch pipe; 240, temperature sensor; 300, annular inclined guide plate; 310, flow damper; 320, second liquid inlet main pipe; 321, second liquid inlet branch pipe; 330, second liquid outlet main pipe; 331, second liquid outlet branch pipe. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] Example 1: See attached document Figures 1-5 This invention provides a stator cooling assembly for a magnetic levitation flywheel energy storage device, comprising a stator core 100. The stator core 100, serving as the magnetic conductor and fixing carrier of the motor stator, is formed by stacking high-silicon steel sheets. Its outer wall is a smooth cylindrical surface, tightly fitting against the inner wall of a cooling sleeve 200, forming a direct path for heat conduction. Sealing grooves are provided at the upper and lower ends of the stator core 100 for installing sealing components, ensuring the airtightness of the cooling chamber. A cooling sleeve 200 for heat dissipation is fitted onto the outer wall of the stator core 100. The cooling sleeve 200 is made of a high thermal conductivity, high-strength metal material, preferably aerospace-grade aluminum alloy (such as 6061-T6) or copper, selected according to the motor power and weight requirements. The cooling sleeve 200 has an annular cylindrical structure, fitted onto the outer wall of the stator core 100, with an annular cooling chamber on its inner side for containing coolant and installing a heat dissipation mechanism. The outer wall is provided with a mounting base or connection interface for fixing the liquid inlet main pipe, the liquid outlet main pipe and the temperature sensor 240. A sealing assembly is provided on the upper and lower sides between the stator core 100 and the cooling jacket 200. The sealing assembly includes two sets of sealing rings 110. The sealing rings 110 are fixed on the upper and lower sides of the opposite side of the inner wall of the stator core 100 and the cooling jacket 200 where they need to fit together. The sealing rings 110 are used to seal between the stator core 100 and the cooling jacket 200 to prevent coolant leakage. The sealing rings 110 are made of elastic material that is resistant to high temperature and coolant corrosion, preferably fluororubber or perfluoroether rubber, which is suitable for long-term immersion in coolant. The sealing rings 110 are respectively embedded in the sealing grooves at the upper and lower ends of the stator core 100. After assembly, they are tightly pressed against the inner wall of the cooling jacket 200 to form a reliable sealing surface. The cooling jacket 200 contains a heat dissipation mechanism for cooling the stator core 100. This mechanism is an annular cooling cavity located inside the cooling jacket 200. Multiple guide plates are fixed within the annular cooling cavity, evenly arranged in a ring array. The guide plates are made of the same metal as the cooling jacket 200 and are evenly arranged in a ring array (the number is determined by the inner diameter of the cooling jacket 200 and the motor power, typically 8-12). The height of the guide plates perfectly matches the height of the annular cooling cavity, ensuring that each guide plate extends from the upper to the lower end of the cooling cavity, dividing the annular cooling cavity into several axial cooling channels with identical structures and cross-sectional areas. Preferably, the guide plates are integrally molded (within the cooling jacket 200). (Synchronous casting or machining) reduces weld joints and lowers leakage risk. If welding is used, laser welding is selected to ensure weld sealing and structural strength. The interior of the annular cooling chamber is divided into several axial cooling channels by guide plates. Each axial cooling channel has a heat dissipation protrusion 210 fixed to its inner wall side to improve heat exchange and cooling effect. Multiple heat dissipation protrusions 210 are evenly arranged in an array on the inner wall side of the axial cooling channels. The cross-sectional shape of the heat dissipation protrusion 210 is triangular, and its external shape matches the shape of the axial cooling channel. The height of the guide plate matches the height of the annular cooling chamber. The heat dissipation protrusions 210 increase the contact area between the coolant and the cooling jacket 200, slow down the coolant flow rate, and disrupt the laminar boundary layer. The cross-sectional shape is triangular, with the apex angle determined according to the channel width (usually 30-60°). Its external shape perfectly matches the inner wall shape of the axial cooling channel, ensuring that the protrusions fit tightly against the inner wall of the channel. A first inlet manifold 220 and a first outlet manifold 230 are respectively fitted onto the upper and lower sides of the outer wall of the cooling jacket 200. The inner wall of the first inlet manifold 220 is fixed to the bottom of the outer wall side of the cooling jacket 200, and the inner wall of the first outlet manifold 230 is fixed to the upper part of the outer wall side of the cooling jacket 200. This arrangement forms a "bottom inlet, top outlet" cooling flow path, utilizing gravity to increase the coolant filling rate. The inner wall of the first inlet manifold 220 fits perfectly against the inner wall of the cooling jacket 200. The outer wall is tightly fitted and fixed by welding or flange connection. Its inlet end is equipped with an interface for connecting to the outlet pipe of an external cooling circulation system. A first inlet branch pipe 221 is fixed to the inner wall side of the first inlet main pipe 220 at a position corresponding to each axial cooling channel. The end of the first inlet branch pipe 221 away from the first inlet main pipe 220 is fixedly connected to the bottom of the inner wall side of the axial cooling channel. Similarly, a first drain branch pipe 231 is fixed to the inner wall side of the first drain main pipe 230 at a position corresponding to each axial cooling channel. The end of the first drain branch pipe 231 away from the first drain main pipe 230 is fixedly connected to the top of the inner wall side of the axial cooling channel.Temperature sensors 240 are fixedly installed on the outer wall side of the cooling jacket 200 at corresponding positions in each axial cooling channel. These sensors 240 monitor the outlet temperature of the coolant in each channel in real time, providing data support for adaptive cooling. PT100 platinum resistance sensors are preferred for temperature sensor 240 to ensure accurate temperature detection. The temperature sensors 240 are installed via a threaded connection, with the sensor probe extending into the axial cooling channel (to a depth that does not affect coolant flow, typically 2-3 mm). Sealant (such as high-temperature resistant silicone sealant) is applied between the probe and the mounting hole of the cooling jacket 200 to prevent coolant leakage. The temperature sensors 240 are connected to an external control system via wires. These wires are high-temperature resistant and aging-resistant shielded wires to avoid electromagnetic interference.

[0022] The usage process of this invention is as follows: Those skilled in the art can first assemble the device according to the above description, then connect all electrical equipment to an external power supply, and control the operation of the device through an external controller. The control programs of all electrical equipment are edited in advance by the production personnel before production. This invention does not make any technical improvements here, but only assumes that it can normally meet the needs of personnel. First, the cooling jacket 200 can be fitted onto the outer wall of the stator core 100. Then, the sealing ring 110 improves the sealing effect on the outer wall of the stator core 100 and the inner wall of the cooling jacket 200. When the motor is in use, cooling water can be supplied from a dedicated water tank to the first inlet manifold 220 through its inlet end. The first inlet manifold 220 can then supply cooling water to the axial cooling channel via the first inlet branch pipe 221, allowing the water to flow from low to high along the axial cooling channel. During operation, the outer wall of the stator core 100 can be cooled by heat exchange. The heated cooling water can be collected in the first drain main pipe 230 through the first drain branch pipe 231 and discharged through the pipe connected to the outside of the first drain main pipe 230, ensuring the circulation of cooling water. The heat dissipation protrusions 210 can slow down the flow rate of the coolant in the axial cooling channel and increase the contact area between the coolant and the annular cooling cavity. Therefore, the heat exchange and cooling effect of the coolant on the outer wall of the stator core 100 can be improved. The temperature sensor 240 is electrically connected to the external control system, which can monitor the temperature of the coolant in the cooling chamber in real time. The external control system adjusts the coolant flow rate of the external cooling circulation system according to the temperature signal fed back by the temperature sensor 240, so as to achieve adaptive cooling and further improve the cooling effect.

[0023] Example 2: Reference Figure 6Compared to Embodiment 1, the difference in this embodiment is that the heat dissipation mechanism is an annular cooling chamber, which is located inside the cooling sleeve 200. Annular inclined guide plates 300 are evenly arranged in an array on the upper and lower sides of the inner wall of the annular cooling chamber. The overall shape of the annular inclined guide plates 300 is arranged with the left side higher than the right side. The annular inclined guide plates 300 are made of the same metal material as the cooling sleeve 200, and are inclined from left to right. The inclination angle is determined according to the coolant flow rate and heat exchange requirements (usually 15-30°). If the angle is too small, the coolant flow will be too slow and impurities will easily accumulate; if the angle is too large, the flow rate will be too fast and heat exchange will be insufficient. The number of annular inclined guide plates 300 is determined according to the height of the cooling sleeve 200 and the motor power. The upper and lower ends of each set of guide plates are connected to the cooling sleeve 200. The inner walls are tightly connected (welded or integrally formed) to form a multi-layered annular flow channel. Slow-flow baffles 310 are fixed between the upper and lower annular inclined guide plates 300. These baffles 310 further reduce the coolant flow rate, increase the heat exchange area, and break the laminar flow of the coolant, creating slight turbulence. The shape of the slow-flow baffles 310 is preferably arc-shaped (matching the curvature of the annular flow channel) to avoid vortices caused by right-angle structures. The slow-flow baffles 310 are evenly distributed along the inclined direction of the annular inclined guide plates 300. The spacing between adjacent baffles is designed to ensure that the coolant can cover the baffle surface without dead flow angles. The slow-flow baffles 310 and the annular inclined guide plates 300... The connection method is welding to ensure structural strength and heat conduction efficiency. A second liquid inlet main pipe 320 is fixed on the right side of the outer wall of the cooling jacket 200. A second liquid inlet branch pipe 321 is fixedly connected to the inner wall side of the second liquid inlet main pipe 320 and between each annular inclined guide plate 300. A second liquid outlet main pipe 330 is fixed on the left side of the outer wall of the cooling jacket 200. A second liquid outlet branch pipe 331 is fixedly connected to the inner wall side of the second liquid outlet main pipe 330 and between each annular inclined guide plate 300. Specifically, the cooling jacket 200 can be fitted onto the outer wall side of the stator core 100. The sealing ring 110 enhances the sealing effect between the outer wall of the stator core 100 and the inner wall side of the cooling jacket 200. When the motor is in use, the cooling water in the cooling water tank is first pumped and piped to the second inlet main pipe 320. The second inlet main pipe 320 can then distribute the coolant through the second inlet branch pipe 321 and deliver it to the annular cooling chamber located between the annular inclined guide plates 300. The cooling water can then be distributed through the annular inclined guide plates 300. The gap formed between the inclined guide plates 300 flows towards the second drain manifold 330, and at the same time, it exchanges heat with the stator core 100 through the inner wall of the cooling jacket 200 to cool it down. The cooling water that has been heated by heat dissipation can flow through the second drain branch pipe 331 into the second drain manifold 330, and then be discharged through the second drain manifold 330. The set slow flow baffle 310 can increase the contact area between the cooling water and the annular cooling cavity, and can also slow down the flow rate of the cooling water, thereby improving the heat dissipation effect on the stator core 100 and making it more convenient for personnel to use.

[0024] The above description is merely a preferred embodiment of the present invention. Any person skilled in the art can modify the present invention or modify it into an equivalent technical solution using the technical solutions described above. Therefore, any simple modifications or equivalent substitutions made based on the technical solutions of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A stator cooling assembly for a motor in a magnetic levitation flywheel energy storage device, characterized in that: It includes a stator core (100), a cooling sleeve (200) for heat dissipation is sleeved on the outer wall side of the stator core (100), a sealing component is provided on the upper and lower sides between the stator core (100) and the cooling sleeve (200), and a heat dissipation mechanism for heat dissipation of the stator core (100) is provided inside the cooling sleeve (200).

2. The stator cooling assembly for the motor of the magnetic levitation flywheel energy storage device according to claim 1, characterized in that: The sealing assembly includes two sets of sealing rings (110), which are fixed to the upper and lower sides of the opposite side of the inner wall of the stator core (100) and the cooling jacket (200) where they need to fit together.

3. The stator cooling assembly for the motor of the magnetic levitation flywheel energy storage device according to claim 1, characterized in that: The heat dissipation mechanism is an annular cooling chamber, which is located inside the cooling sleeve (200). Multiple guide plates are fixed inside the annular cooling chamber.

4. The stator cooling assembly for the motor of the magnetic levitation flywheel energy storage device according to claim 3, characterized in that: Multiple guide vanes are evenly arranged in a ring array, and the interior of the ring cooling chamber is divided into several axial cooling channels by the guide vanes.

5. The stator cooling assembly for the motor of the magnetic levitation flywheel energy storage device according to claim 4, characterized in that: The inner wall of the axial cooling channel is fixed with heat dissipation protrusions (210) to improve the heat exchange and cooling effect. Multiple heat dissipation protrusions (210) are evenly arranged in an array on the inner wall of the axial cooling channel.

6. The stator cooling assembly for the motor of the magnetic levitation flywheel energy storage device according to claim 5, characterized in that: The heat dissipation protrusion (210) has a triangular cross-sectional shape. The external shape of the heat dissipation protrusion (210) is adapted to the shape of the axial cooling channel, and the height of the guide plate is adapted to the height of the annular cooling cavity.

7. The stator cooling assembly for the motor of the magnetic levitation flywheel energy storage device according to claim 3, characterized in that: The upper and lower sides of the outer wall of the cooling jacket (200) are respectively fitted with a first liquid inlet manifold (220) and a first liquid outlet manifold (230). The inner wall of the first liquid inlet manifold (220) is fixed to the bottom of the outer wall side of the cooling jacket (200), and the inner wall of the first liquid outlet manifold (230) is fixed to the upper part of the outer wall side of the cooling jacket (200).

8. The stator cooling assembly for a magnetic levitation flywheel energy storage device according to claim 7, characterized in that: A first liquid inlet branch pipe (221) is fixed at the inner wall side end of the first liquid inlet main pipe (220) and at the corresponding position of each of the axial cooling channels. The end of the first liquid inlet branch pipe (221) away from the first liquid inlet main pipe (220) is fixedly connected to the bottom of the inner wall side end of the axial cooling channel. A first liquid drain branch pipe (231) is fixed at the inner wall side end of the first liquid drain main pipe (230) and at the corresponding position of each of the axial cooling channels. The end of the first liquid drain branch pipe (231) away from the first liquid drain main pipe (230) is fixedly connected to the top of the inner wall side end of the axial cooling channel. A temperature sensor (240) is fixedly installed on the outer wall side end of the cooling jacket (200) at the corresponding position of each axial cooling channel.

9. The stator cooling assembly for a magnetic levitation flywheel energy storage device according to claim 1, characterized in that: The heat dissipation mechanism is an annular cooling chamber, which is located inside the cooling sleeve (200). The inner walls of the annular cooling chamber are evenly arranged with annular inclined guide plates (300) in an array. The annular inclined guide plates (300) are arranged with the left side higher than the right side. A flow-slowing baffle (310) is fixed between the upper and lower annular inclined guide plates (300).

10. A stator cooling assembly for a magnetic levitation flywheel energy storage device motor according to claim 7 or 9, characterized in that: A second liquid inlet manifold (320) is fixed to the right side of the outer wall of the cooling jacket (200). A second liquid inlet branch pipe (321) is fixedly connected to the inner wall side of the second liquid inlet manifold (320) and between each of the annular inclined guide plates (300). A second liquid outlet manifold (330) is fixed to the left side of the outer wall of the cooling jacket (200). A second liquid outlet branch pipe (331) is fixedly connected to the inner wall side of the second liquid outlet manifold (330) and between each of the annular inclined guide plates (300).

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