Rotor heat dissipation system and flywheel energy storage device

Abstract

The present application relates to the technical field of energy storage, in particular to a rotor heat dissipation system and a flywheel energy storage device. The rotor heat dissipation system comprises: a plurality of evaporative cooling boxes, which are arranged in a hollow rotating shaft along the axial direction of the hollow rotating shaft, each evaporative cooling box has a liquid inlet and a gas outlet, and a liquid cooling medium is stored in the evaporative cooling box; a heat exchanger, which is adapted to be arranged on the outside of a vacuum shell, the heat exchanger is communicated with the gas outlet through an air inlet pipe, and the heat exchanger is communicated with the liquid inlet through a liquid outlet pipe. The present application sets a plurality of evaporative cooling boxes in the axial direction of the hollow rotating shaft and forms a plurality of first cooling circulation loops, an effective circulating heat dissipation process can be carried out in each evaporative cooling box, the heat dissipation efficiency and the heat dissipation uniformity in the axial direction of the hollow rotating shaft are ensured, the uniformity of the temperature of the whole system is improved, the heat dissipation capacity in the axial direction is consistent, and the problem of poor heat dissipation uniformity of the flywheel rotor in the prior art is effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a rotor heat dissipation system and a flywheel energy storage device. BACKGROUND

[0002] Flywheel energy storage refers to a storage mode that uses an electric motor to drive a flywheel to rotate at high speed, and uses the flywheel to drive a generator to generate electricity when needed. The flywheel energy storage has the characteristics of high power density and long service life. In the motor and electromagnetic bearing of the flywheel energy storage system, the copper loss, iron loss and rotor eddy current loss of the stator are usually converted into system heat sources, and the heat generated will cause the temperature of the system to rise, especially the temperature of the flywheel rotor.

[0003] At present, the flywheel rotor is mainly cooled by setting a heat exchange cavity in the hollow rotating shaft. One end of the heat exchange cavity is connected with a heat exchanger. The heat of the hollow rotating shaft is transferred to the heat exchange cavity. The liquid working medium in the heat exchange cavity absorbs heat and vaporizes and rises to the heat exchanger to take away heat. The gaseous working medium in the heat exchanger condenses into liquid working medium and flows back to the heat exchange cavity. This way has high heat dissipation efficiency, but the hollow rotating shaft of the flywheel rotor is usually vertically arranged. The above-mentioned method uses a through heat exchange cavity. The working medium with lower temperature is located at the position of the bottom of the heat exchange cavity in the axial direction. As the working medium at the position of the middle and below of the heat exchange cavity vaporizes to form a large number of bubbles moving upward, the bubbles occupy the position above the middle of the heat exchange cavity in the moving process, causing the volume of the liquid working medium corresponding to the heat source at the position of the middle and above of the heat exchange cavity to be small, and thus the heat dissipation demand of the current position cannot be met, resulting in uneven temperature distribution in the axial direction of the hollow rotating shaft, i.e., the bottom is low and the top is high. Therefore, the existing flywheel rotor has the problem of poor heat dissipation uniformity. SUMMARY

[0004] Therefore, the present application aims to overcome the defect of poor heat dissipation uniformity of the flywheel rotor in the prior art, and to provide a rotor heat dissipation system and a flywheel energy storage device.

[0005] In order to solve the above-mentioned problems, the present application provides a rotor heat dissipation system, which comprises: a plurality of evaporative cooling boxes, which are arranged in the hollow rotating shaft in the axial direction of the hollow rotating shaft at intervals, each evaporative cooling box has a liquid inlet and a gas outlet, and the evaporative cooling box stores liquid cooling working medium, which is adapted to absorb heat on the hollow rotating shaft and change into gaseous cooling working medium; a heat exchanger, which is adapted to be arranged outside the vacuum shell, the heat exchanger is communicated with the gas outlet through an air inlet pipe, and the heat exchanger is communicated with the liquid inlet through a liquid outlet pipe, and the heat exchanger is adapted to condense the gaseous cooling working medium therein into liquid cooling working medium; wherein each evaporative cooling box, the air inlet pipe communicated with each evaporative cooling box, the heat exchanger and the liquid outlet pipe communicated with each evaporative cooling box form a first cooling circulation loop, and a plurality of first cooling circulation loops are adapted to cool the hollow rotating shaft.

[0006] Optionally, the rotor heat dissipation system further comprises a heat conduction part arranged in the inner cavity between the hollow rotating shaft and the evaporative cooling box, and the heat conduction part is adapted to transfer heat of the hollow rotating shaft to the evaporative cooling box.

[0007] Optionally, the heat conduction part is a heat conduction cooling medium, and the rotor heat dissipation system further comprises a cooling part and a driving pump, the cooling part is arranged in the heat exchanger and communicates with the inner cavity through the vacuum shell, the heat conduction part and the cooling part form a second cooling circulation loop, and the driving pump is adapted to drive the heat conduction cooling medium to flow in the second cooling circulation loop to cool the hollow rotating shaft.

[0008] Optionally, the cooling part is a cooling pipe, two ends of the cooling pipe communicate with the inner cavity through the vacuum shell, or the cooling part comprises a cooling box, a cooling inlet pipe and a cooling outlet pipe, one end of the cooling inlet pipe communicates with the cooling box and the other end communicates with the inner cavity through the vacuum shell, and one end of the cooling outlet pipe communicates with the cooling box and the other end communicates with the inner cavity through the vacuum shell.

[0009] Optionally, the rotor heat dissipation system further comprises a mounting frame, a rotating rod and a matching rod, the mounting frame is fixedly arranged relative to the vacuum shell, the rotating rod and the matching rod are rotatably arranged in the mounting frame, the rotating rod is fixedly arranged on the hollow rotating shaft, the matching rod is horizontally arranged on the mounting frame and is in transmission cooperation with the rotating rod, a turbine is fixedly arranged on the matching rod, and the rotating rod is adapted to rotate with the hollow rotating shaft and drive the matching rod to rotate.

[0010] Optionally, the rotor heat dissipation system further comprises a vertical rod and a plurality of turbines, the plurality of turbines are rotatably and spacedly arranged on the vertical rod, and the vertical rod is fixedly arranged inside the hollow rotating shaft along the axial direction of the hollow rotating shaft.

[0011] Optionally, a fixed cover is arranged at the top end of the hollow rotating shaft, the air inlet pipe and the liquid outlet pipe are arranged in the fixed cover, and the fixed cover is fixedly connected with the vacuum shell.

[0012] Optionally, the rotor heat dissipation system further comprises a plurality of connecting pieces, two adjacent evaporative cooling boxes are fixedly connected through the connecting pieces, the evaporative cooling box at the top is fixedly connected with the vacuum shell through the connecting piece arranged in the fixed cover, and the evaporative cooling boxes remain stationary when the hollow rotating shaft rotates.

[0013] Optionally, the heat exchanger comprises a heat exchange box and a condensation box, the condensation box is arranged in the heat exchange box, the air inlet pipe and the liquid outlet pipe communicate with the condensation box, the pipe opening of the air inlet pipe is arranged close to the top wall of the condensation box, and the pipe opening of the liquid outlet pipe is arranged close to the bottom surface of the condensation box.

[0014] The application further provides a flywheel energy storage device, which comprises a vacuum shell, a flywheel energy storage unit and the rotor heat dissipation system, the flywheel energy storage unit is arranged in the vacuum shell, and the rotor heat dissipation system is arranged on the hollow rotating shaft of the flywheel energy storage unit.

[0015] The present application has the following advantages:

[0016] 1. A plurality of evaporation cooling boxes are arranged in the axial direction of the hollow rotating shaft to form a plurality of first cooling circulation loops, and the cooling medium is distributed more uniformly in the axial direction of the hollow rotating shaft, and each evaporation cooling box can effectively circulate and dissipate heat, and the gaseous cooling medium at the lower part no longer occupies the space of the liquid cooling medium at the upper part when circulating, thereby ensuring the axial heat dissipation efficiency and heat dissipation uniformity of the hollow rotating shaft, improving the uniformity of the temperature of the entire system, and ensuring the consistency of the axial heat dissipation capacity, thereby effectively solving the problem of poor heat dissipation uniformity of the flywheel rotor in the prior art.

[0017] 2. The heat-conducting part is a liquid metal, which changes the heat conduction through air or the inner wall of the hollow rotating shaft in the prior art, and improves the heat transfer efficiency from the hollow rotating shaft to the evaporation cooling box.

[0018] 3. The evaporation cooling box, the gas inlet pipe and the liquid outlet pipe are fixed in the vacuum shell together with the fixed cover and do not rotate with the hollow rotating shaft, thereby preventing the evaporation cooling box from shaking when rotating with the hollow rotating shaft, and further causing instability of the hollow rotating shaft, and preventing the evaporation cooling box from being damaged prematurely due to long-term sliding.

[0019] 4. The cooling pipe is also arranged in the heat exchange box to exchange heat with the condensation box, thereby reducing the volume of the system, enhancing the flexibility of the system, and improving the utilization rate of the heat exchange box.

[0020] 5. The cooling pipe is a pipe with several short bends, which is used to increase the heat exchange area of the cooling pipe in the heat exchange box, thereby improving the heat exchange efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the following specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0022] Figure 1 A structure diagram of a rotor heat dissipation system of an embodiment of the present application is shown;

[0023] Figure 2 An enlarged diagram of A of the rotor heat dissipation system of Figure 1 is shown;

[0024] Figure 3 An enlarged diagram of B of the rotor heat dissipation system of Figure 1 is shown;

[0025] Figure 4 Fig. 4 shows an enlarged schematic view of the vertical rod of the rotor heat dissipation system of Fig. 1 ; Figure 1

[0026] Figure 5 Fig. 5 shows an enlarged schematic view of C of the rotor heat dissipation system of Fig. 1. Figure 1

[0027] BRIEF DESCRIPTION OF DRAWINGS

[0028] 10, evaporative cooling tank; 11, liquid inlet; 12, gas outlet; 13, condensing pipe; 14, connecting piece; 15, condensing tank; 16, gas inlet pipe; 17, liquid outlet pipe; 20, heat exchanger; 30, hollow rotating shaft; 31, fixed cover; 40, vacuum shell; 50, cooling pipe; 61, mounting frame; 62, rotating rod; 63, matching rod; 71, vertical rod; 72, turbine; 81, radial bearing; 82, electromagnetic bearing; 83, rotor; 84, flywheel. DETAILED DESCRIPTION

[0029] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0030] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.​​

[0033] As Figures 1 to 5 shown, the rotor heat dissipation system of the embodiment comprises: a plurality of evaporative cooling boxes 10 and a heat exchanger 20, the plurality of evaporative cooling boxes 10 are arranged in the hollow rotating shaft 30 along the axial direction of the hollow rotating shaft 30, each evaporative cooling box 10 has a liquid inlet 11 and a gas outlet 12, the evaporative cooling box 10 stores a liquid cooling medium, the liquid cooling medium is adapted to absorb heat on the hollow rotating shaft 30 and change into a gaseous cooling medium; the heat exchanger 20 is adapted to be arranged outside the vacuum shell 40, the heat exchanger 20 is communicated with the gas outlet 12 through the gas inlet pipe 16, the heat exchanger 20 is communicated with the liquid inlet 11 through the liquid outlet pipe 17, the heat exchanger 20 is adapted to condense the gaseous cooling medium therein into a liquid cooling medium; wherein each evaporative cooling box 10, the gas inlet pipe 16 communicated with each evaporative cooling box 10, the heat exchanger 20 and the liquid outlet pipe 17 communicated with each evaporative cooling box 10 form a first cooling cycle loop, and the plurality of first cooling cycle loops are adapted to cool the hollow rotating shaft 30.

[0034] The rotor heat dissipation system of the embodiment is applied, a plurality of evaporative cooling boxes 10 are arranged in the axial direction of the hollow rotating shaft 30 and a plurality of first cooling cycle loops are formed, the cooling medium is more uniformly distributed in the axial direction of the hollow rotating shaft 30, effective circulation heat dissipation process can be carried out in each evaporative cooling box 10, the gaseous cooling medium located below no longer occupies the space of the liquid cooling medium above when circulating, the axial heat dissipation efficiency and heat dissipation uniformity of the hollow rotating shaft 30 are ensured, the uniformity of the temperature of the entire system is improved, the heat dissipation capacity in the axial direction is consistent, and the problem of poor heat dissipation uniformity of the flywheel rotor in the prior art is effectively solved.

[0035] Specifically, since the heat dissipation process mainly relies on the process that the cooling medium changes from liquid to gas, in order to facilitate the inflow of the liquid cooling medium and the outflow of the gaseous cooling medium, the liquid inlet 11 is arranged at the bottom of the evaporative cooling box 10, and the gas outlet 12 is arranged at the top of the evaporative cooling box 10, so that the entire circulation process is more smooth and reasonable.

[0036] Specifically, the plurality of evaporative cooling boxes 10 can share one heat exchanger 20, the plurality of evaporative cooling boxes 10 are arranged in parallel, or the number of heat exchangers 20 is a plurality, and the plurality of evaporative cooling boxes 10 are communicated one by one with a plurality of condensing parts.

[0037] In the embodiment, the rotor heat dissipation system further comprises a heat conduction part, which is arranged in the inner cavity between the hollow rotating shaft 30 and the evaporative cooling box 10, and is adapted to transfer the heat of the hollow rotating shaft 30 to the evaporative cooling box 10. The heat conduction part can more rapidly and uniformly transfer the heat to the evaporative cooling box 10, thereby effectively improving the heat conduction efficiency. It can be understood that, as an alternative embodiment, the inner cavity between the hollow rotating shaft 30 and the evaporative cooling box 10 can also be omitted, and the heat conduction part can be a solid medium and directly adhere to the evaporative cooling box 10 as the inner wall of the hollow rotating shaft 30.

[0038] Specifically, the specific type of the heat conduction part is not limited, which can be a solid medium, a gaseous medium, or a liquid medium, and can efficiently and uniformly conduct heat. The heat conduction through air or the inner wall of the hollow rotating shaft 30 in the existing heat dissipation scheme is changed, and the heat transfer efficiency from the hollow rotating shaft 30 to the evaporative cooling box 10 is improved.

[0039] In the embodiment, the heat conduction part is a heat conduction cooling medium, and the rotor heat dissipation system further comprises a cooling part and a driving pump. The cooling part is located in the heat exchanger 20 and communicates with the inner cavity through the vacuum shell 40. The heat conduction part and the cooling part form a second cooling circulation loop, and the driving pump is adapted to drive the heat conduction cooling medium to flow in the second cooling circulation loop to cool the hollow rotating shaft 30. The heat conduction part not only has a heat conduction effect, but also can simultaneously dissipate heat from the hollow rotating shaft 30 through the cooling part and the driving pump, thereby further improving the heat dissipation capacity of the entire system. It can be understood that, as an alternative embodiment, the cooling part and the driving pump can also be omitted, and the heat conduction part only exists as a heat conduction medium.

[0040] Specifically, the heat conduction cooling medium is a liquid metal, and the thermal conductivity of the liquid metal can reach 39 W / (m·K). The thermal conductivity of air is only 0.0267 W / (m·K). Therefore, in the existing heat dissipation scheme, the heat obtained by the heat exchange cavity is transferred to the heat dissipation device through air heat conduction by the inner wall of the hollow rotating shaft 30, and the heat conduction efficiency is low. The specific components of the liquid metal can be gallium-based, indium-based, or gallium-indium-tin alloy, etc. High-thermal-conductivity nanoparticles can also be added to the liquid metal to form a mixed metal. Wherein, W is watt, m is meter, and K is Kelvin.

[0041] In the embodiment, the cooling part is a cooling pipe 50, both ends of the cooling pipe 50 pass through the vacuum shell 40 and communicate with the inner cavity, or the cooling part comprises a cooling box, a cooling inlet pipe and a cooling outlet pipe, one end of the cooling inlet pipe communicates with the cooling box and the other end passes through the vacuum shell 40 and communicates with the inner cavity, one end of the cooling outlet pipe communicates with the cooling box and the other end passes through the vacuum shell 40 and communicates with the inner cavity, the cooling part has a flexible setting mode, if it is the cooling pipe 50, the heat exchange and cooling process can be completed in the heat exchanger 20, without the need of additional structure, the use rate of the heat exchanger 20 is improved, if it is the cooling box, the cooling inlet pipe and the cooling outlet pipe, the cooling part is an independent heat exchange and cooling structure, avoiding the influence of the heat exchange of the cooling part on the heat exchange effect of the cooling working medium in the heat exchanger 20.

[0042] In the embodiment, the rotor heat dissipation system further comprises a mounting frame 61, a rotating rod 62 and a matching rod 63, the mounting frame 61 is fixedly arranged relative to the vacuum shell 40, the rotating rod 62 and the matching rod 63 are rotatably arranged on the mounting frame 61, the rotating rod 62 is fixedly arranged on the hollow rotating shaft 30, the matching rod 63 is horizontally arranged on the mounting frame 61 and is in transmission cooperation with the rotating rod 62, a turbine 72 is fixedly arranged on the matching rod 63, the rotating rod 62 is adapted to rotate with the hollow rotating shaft 30 and drive the matching rod 63 to rotate, the turbine 72 rotatably arranged on the matching rod 63 can effectively accelerate the flow of the liquid metal in the inner cavity, and since the turbine 72 is fixedly arranged and rotates, it can guide the flow of the liquid metal in the inner cavity and accelerate the circulation process of the liquid metal.

[0043] Specifically, as shown in Figure 3 the mounting frame 61 is preferably fixedly arranged on the lowermost evaporative cooling box 10, facilitating installation and maintenance; the specific structure of the mounting frame 61 is not limited, as long as it can reliably support the matching rod 63; the cooperation mode between the rotating rod 62 and the matching rod 63 can be helical gear transmission or turbine worm transmission, which can change the vertical rotation of the rotating rod 62 into radial rotation along the evaporative cooling box 10.

[0044] In the embodiment, the rotor heat dissipation system further comprises a vertical rod 71 and a plurality of turbines 72, the plurality of turbines 72 are rotatably and spacedly arranged on the vertical rod 71, the vertical rod 71 is fixedly arranged inside the hollow rotating shaft 30 along the axial direction of the hollow rotating shaft 30, the vertical rod 71 moves circumferentially around the rotating shaft thereof with the rotation of the hollow rotating shaft 30, and the plurality of turbines 72 on the vertical rod 71 can further accelerate the flow of the liquid metal in the inner cavity, thereby improving the uniformity and the circulation heat dissipation efficiency. It can be understood that, as an alternative embodiment, the vertical rod 71 and the plurality of turbines 72 can not be arranged, and the plurality of turbines 72 can be rotatably arranged on the inner wall of the hollow rotating shaft 30 through a vertical fixed rod.

[0045] Specifically, two vertical rods 71 are arranged in the inner cavity, and the guide directions of the turbines 72 on the two vertical rods 71 are arranged in opposite directions, so that the liquid metal in the inner cavity can flow in a clockwise or counterclockwise circulation, and the specific circulation direction can be set according to the flow direction of the second cooling circulation loop. It can be understood that the number of vertical rods 71, the number and interval distance of the turbines 72 on each vertical rod 71 can be changed according to actual needs.

[0046] In the embodiment, the top end of the hollow rotating shaft 30 is provided with a fixing cover 31, the air inlet pipe 16 and the liquid outlet pipe 17 are arranged on the fixing cover 31, the fixing cover 31 is fixedly connected with the vacuum shell 40, the evaporative cooling tank 10, the air inlet pipe 16 and the liquid outlet pipe 17 are fixed with the fixing cover 31 and are fixed in the vacuum shell 40, and do not rotate with the hollow rotating shaft 30, so as to prevent the evaporative cooling tank 10 from shaking due to the rotation of the hollow rotating shaft 30, and further to cause the instability of the hollow rotating shaft 30, and also to prevent the cooling tank 10 from being damaged due to long-term sliding.

[0047] It can be understood that, as an alternative embodiment, if the influence of the fixing cover 31 and the hollow rotating shaft 30 on the vacuum degree in the vacuum shell 40 is reduced, the fixing cover 31 can also be fixedly connected with the hollow rotating shaft 30, and the cooling system rotates with the hollow rotating shaft 30, at this time, in order to meet the rotation requirement of the air inlet pipe 16, the liquid outlet pipe 17 and the cooling pipe 50, a rotatable matching plate needs to be arranged on the vacuum shell 40, at this time, the air inlet pipe 16, the liquid outlet pipe 17 and the cooling pipe 50 are arranged on the matching plate and rotate with the hollow rotating shaft 30.

[0048] Specifically, since the rotating speed of the flywheel 84 can reach 1000 rpm, the vibration and runout of the central shaft are easy to occur, and if the heat dissipation structure rotates with the hollow rotating shaft 30, the instability of the system will be increased; the rotating sealing element is arranged between the fixing cover 31 and the hollow rotating shaft 30, so as to reduce the influence on the vacuum degree in the vacuum shell 40 as much as possible.

[0049] In the embodiment, the rotor heat dissipation system further comprises a plurality of connecting pieces 14, and two adjacent evaporative cooling tanks 10 are fixedly connected through the connecting pieces 14. The evaporative cooling tank 10 at the top is fixedly connected with the vacuum shell 40 through the connecting piece 14 arranged on the fixing cover 31, and the evaporative cooling tank 10 remains stationary when the hollow rotating shaft 30 rotates, and the connecting structure is simple and reliable, and is easy to process and manufacture. It should be noted that, in order to better show the structure of the air inlet pipe 16, the liquid outlet pipe 17 and the cooling pipe 50 on the fixing cover 31, Figure 2The connecting member 14 is not shown in the figure. It can be understood that, as an alternative embodiment, the air inlet pipe 16 and the liquid outlet pipe 17 can be fixed to the fixing cover 31, and the cooling pipe 50 is not fixed to the fixing cover 31 and rotates with the hollow rotating shaft 30, or the cooling pipe 50 is fixed to the fixing cover 31, and the air inlet pipe 16 and the liquid outlet pipe 17 are not fixed to the fixing cover 31 and rotate with the hollow rotating shaft 30.

[0050] Specifically, the connecting member 14 can be a vertically arranged connecting rod, such as a metal strip, a metal rod, a hard rod, etc., or a connecting frame, etc.

[0051] In the embodiment, the heat exchanger 20 includes a heat exchange box and a condensing box 15, the condensing box 15 is arranged in the heat exchange box, the air inlet pipe 16 and the liquid outlet pipe 17 are communicated with the condensing box 15, the pipe opening of the air inlet pipe 16 is arranged close to the top wall of the condensing box 15, and the pipe opening of the liquid outlet pipe 17 is arranged close to the bottom surface of the condensing box 15. After the gaseous cooling medium enters the condensing box 15 from the air inlet pipe 16, the gaseous cooling medium is in contact with the inner wall of the condensing box 15, is liquefied into liquid cooling medium by heat release, and flows to the bottom of the condensing box 15 and then flows into each evaporative cooling box 10 through the lower liquid outlet pipe 17, so that the gaseous cooling medium has sufficient time for heat exchange, and the heat exchange efficiency of the gaseous cooling medium is also improved due to the large inner surface area of the condensing box 15. It can be understood that, as an alternative embodiment, the condensing box 15 can not be arranged, and the air inlet pipe 16 and the liquid outlet pipe 17 are directly communicated to form a whole condensing pipe 13, heat exchange is performed in the heat exchanger 20, or the condensing box 15 is replaced by heat exchange fins, and the air inlet pipe 16 and the liquid outlet pipe 17 are communicated with the heat exchange fins.

[0052] Specifically, the specific form of the heat exchange box is not limited, and the heat exchange box can be provided with a circulating liquid cooling source, or can be a fan cooling device provided with a fan, etc. The cooling pipe 50 is also arranged in the heat exchange box and performs heat exchange with the condensing box 15, so that the volume of the system is reduced, the flexibility of the system is enhanced, and the utilization rate of the heat exchange box is improved. Figure 2 As shown in the figure, the cooling pipe 50 is a pipe with several short bends, and the purpose is to increase the heat exchange area of the cooling pipe 50 in the heat exchange box, so as to improve the heat exchange efficiency.

[0053] The application also provides a flywheel energy storage device, which includes a vacuum shell 40, a flywheel energy storage unit, and the rotor heat dissipation system described above. The flywheel energy storage unit is arranged in the vacuum shell 40, and the rotor heat dissipation system is arranged on the hollow rotating shaft 30 of the flywheel energy storage unit.

[0054] Specifically, the vacuum shell 40 is a solid structure surrounding the flywheel energy storage system unit. The flywheel energy storage unit further includes a radial bearing 81, an electromagnetic bearing 82, a rotor 83, a flywheel 84, etc. which are fixedly arranged on the hollow rotating shaft 30. The structure of the flywheel energy storage unit can refer to the existing flywheel energy storage unit, and details are not described here.

[0055] The following describes the use of the rotor heat dissipation system of the present embodiment:

[0056] During operation of the flywheel energy storage unit, heat generated by the rotor 83 and the bearing is first transferred to the liquid metal along the inner wall of the hollow rotating shaft 30. With rotation of the blades of the turbine 72, the circulating liquid metal carries away part of the heat and exchanges heat with the outside through the cooling pipe 50, while another part of the heat is conducted to the evaporative cooling tank 10 through the sufficient flow of the liquid metal. The cooling medium in the evaporative cooling tank 10 absorbs heat and becomes gaseous, flows to the external condensing tank 15 and condenses into liquid, and returns to the evaporative cooling tank 10 under the action of gravity, forming a closed self-circulating cooling system that can sufficiently reduce the temperature of the rotor 83 and the bearing.

[0057] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0058] 1. A plurality of evaporative cooling tanks 10 are arranged in the axial direction of the hollow rotating shaft 30 and form a plurality of first cooling circulation loops, and the cooling medium is more uniformly distributed in the axial direction of the hollow rotating shaft 30, so that an effective circulation heat dissipation process can be carried out in each evaporative cooling tank 10, and the gaseous cooling medium at the lower part no longer occupies the space of the liquid cooling medium at the upper part during circulation, thereby ensuring the axial heat dissipation efficiency and heat dissipation uniformity of the hollow rotating shaft 30, improving the uniformity of the temperature of the entire system, and ensuring the consistency of the heat dissipation capacity in the axial direction.

[0059] 2. The heat-conducting part is liquid metal, which changes the heat conduction through air or the inner wall of the hollow rotating shaft 30 in the existing heat dissipation scheme, and improves the heat transfer efficiency from the hollow rotating shaft 30 to the evaporative cooling tank 10.

[0060] 3. The evaporative cooling tank 10, the gas inlet pipe 16 and the liquid outlet pipe 17 are fixed with the fixed cover 31 in the vacuum shell 40 and do not rotate with the hollow rotating shaft 30, preventing the evaporative cooling tank 10 from shaking and causing instability of the hollow rotating shaft 30 when the hollow rotating shaft 30 rotates, and preventing the evaporative cooling tank 10 from being damaged prematurely due to long-term sliding.

[0061] 4. The rotor heat dissipation system further comprises a cooling part and a driving pump, and the heat-conducting part and the cooling part form a second cooling circulation loop, so that the heat-conducting part not only has a heat-conducting effect, but also can simultaneously dissipate heat from the hollow rotating shaft 30 through the cooling part and the driving pump, further improving the heat dissipation capacity of the entire system.

[0062] 5. The rotating turbine 72 on the cooperation rod 63 can effectively accelerate the flow of the liquid metal in the inner cavity, and since the turbine 72 rotates at a fixed position, it can guide the flow of the liquid metal in the inner cavity and accelerate the circulation process of the liquid metal.

[0063] Obviously, the above-mentioned embodiments are only examples for clearly illustrating the present application, but not limitation to the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and also impossible to enumerate all the embodiments. The obvious changes or variations derived from the above description are still within the protection scope of the present application.

Claims

1. A rotor heat dissipation system, characterized in that, include: Multiple evaporative cooling tanks (10) are spaced apart along the axial direction of the hollow rotating shaft (30) in the hollow rotating shaft (30). Each of the evaporative cooling tanks (10) has a liquid inlet (11) and an air outlet (12). The evaporative cooling tanks (10) store liquid cooling medium, which is adapted to absorb heat on the hollow rotating shaft (30) and transform into gaseous cooling medium. A heat exchanger (20) is adapted to be disposed on the outside of a vacuum shell (40). The heat exchanger (20) is connected to the outlet (12) via an inlet pipe (16) and to the inlet (11) via a liquid outlet pipe (17). The heat exchanger (20) is adapted to condense the gaseous cooling medium therein into a liquid cooling medium. Each of the evaporative cooling boxes (10), the air inlet pipe (16) connected to each of the evaporative cooling boxes (10), the heat exchanger (20), and the liquid outlet pipe (17) connected to each of the evaporative cooling boxes (10) form a first cooling circulation loop, and the plurality of first cooling circulation loops are adapted to cool the hollow rotating shaft (30); The rotor cooling system further includes a heat-conducting part, which is disposed in the inner cavity formed between the hollow rotating shaft (30) and the evaporative cooling box (10). The heat-conducting part is adapted to transfer the heat of the hollow rotating shaft (30) to the evaporative cooling box (10). The heat-conducting part is a heat-conducting cooling medium. The rotor heat dissipation system also includes a cooling part and a drive pump. The cooling part is located inside the heat exchanger (20) and passes through the vacuum shell (40) and communicates with the inner cavity. The heat-conducting part and the cooling part form a second cooling circulation loop. The drive pump is adapted to drive the heat-conducting cooling medium to flow in the second cooling circulation loop to cool and reduce the temperature of the hollow shaft (30).

2. The rotor cooling system according to claim 1, characterized in that, The cooling section is a cooling pipe (50), and both ends of the cooling pipe (50) pass through the vacuum housing (40) and communicate with the inner cavity. Alternatively, the cooling section includes a cooling box, a cooling inlet pipe and a cooling outlet pipe, one end of the cooling inlet pipe being connected to the cooling box and the other end passing through the vacuum housing (40) and communicating with the inner cavity, and one end of the cooling outlet pipe being connected to the cooling box and the other end passing through the vacuum housing (40) and communicating with the inner cavity.

3. The rotor cooling system according to claim 1 or 2, characterized in that, The rotor cooling system also includes a mounting bracket (61), a rotating rod (62), and a mating rod (63). The mounting bracket (61) is fixedly disposed relative to the vacuum housing (40). The rotating rod (62) and the mating rod (63) are rotatably disposed on the mounting bracket (61). The rotating rod (62) is fixedly disposed on the hollow rotating shaft (30). The mating rod (63) is horizontally disposed on the mounting bracket (61) and drives the rotating rod (62) in a transmission cooperation. A turbine (72) is fixedly disposed on the mating rod (63). The rotating rod (62) is adapted to rotate with the hollow rotating shaft (30) and drive the mating rod (63) to rotate.

4. The rotor cooling system according to claim 1 or 2, characterized in that, The rotor cooling system also includes a vertical rod (71) and a plurality of turbines (72), the plurality of turbines (72) being rotatably spaced on the vertical rod (71), the vertical rod (71) being fixedly disposed inside the hollow rotating shaft (30) along the axial direction of the hollow rotating shaft (30).

5. The rotor cooling system according to claim 1 or 2, characterized in that, The top of the hollow rotating shaft (30) is provided with a fixed cover (31), the air inlet pipe (16) and the liquid outlet pipe (17) are inserted through the fixed cover (31), and the fixed cover (31) is fixedly connected to the vacuum shell (40).

6. The rotor cooling system according to claim 5, characterized in that, The rotor cooling system also includes multiple connectors (14). Two adjacent evaporative cooling boxes (10) are fixedly connected by the connectors (14). The evaporative cooling box (10) located at the top is fixedly connected to the vacuum shell (40) by the connectors (14) passing through the fixed cover (31). The evaporative cooling box (10) remains stationary when the hollow rotating shaft (30) rotates.

7. The rotor cooling system according to claim 1 or 2, characterized in that, The heat exchanger (20) includes a heat exchange box and a condenser box (15). The condenser box (15) is disposed in the heat exchange box. The air inlet pipe (16) and the liquid outlet pipe (17) are connected to the condenser box (15). The inlet of the air inlet pipe (16) is disposed near the top wall of the condenser box (15), and the inlet of the liquid outlet pipe (17) is disposed near the bottom surface of the condenser box (15).

8. A flywheel energy storage device, characterized in that, include: The vacuum housing (40), the flywheel energy storage unit, and the rotor heat dissipation system according to any one of claims 1 to 7, wherein the flywheel energy storage unit is disposed in the vacuum housing (40), and the rotor heat dissipation system is disposed on the hollow shaft (30) of the flywheel (84) energy storage unit.

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