Bearing cooling device for flywheel system
By adopting a single-end cooling path and a rotary seal design in the flywheel system, the problem of rotary seal leakage in the bearing cooling device was solved, achieving efficient cooling and improved stability, and reducing maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-22
- Publication Date
- 2026-03-27
AI Technical Summary
Existing flywheel systems' bearing cooling devices are prone to leakage of the rotary seal assembly under high-speed rotation, increasing maintenance costs and reducing system stability.
A single-end cooling path is adopted, and a rotary seal is set between the flywheel shaft and the sealing end cover to reduce the number of rotary seals used. Cooling efficiency is improved by utilizing coolant delivery pipes and heat transfer components, and the risk of leakage is reduced.
It reduces the risk of leakage caused by wear of the rotary seal, lowers maintenance costs, and improves the long-term operational reliability and stability of the flywheel system.
Smart Images
Figure CN224049570U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the cooling device technical field of flywheel system, especially a bearing cooling device for flywheel system. BACKGROUND
[0002] Flywheel system has wide application in flywheel energy storage, ship roll reduction and other fields owing to its high efficient energy storage characteristics and dynamic stability advantages. Flywheel system usually relies on high speed rotating flywheel and rotating shaft assembly. Under high speed rotating working condition, a large amount of heat is generated on the contact surface of bearing inner and outer rings. It is difficult to arrange direct heat dissipation path for bearing inner ring due to space closure and rotating component interference limitation. Uneven heat dissipation of bearing inner and outer rings can easily lead to performance reduction of bearing, and even affect the operation of flywheel system. In the prior art, a cooling structure for high speed rotating device is disclosed. Hollow channel is arranged in rotating shaft. Cooling liquid inlet and outlet are arranged at both ends of hollow channel respectively. Heat exchange is carried out by the way that cooling liquid flows in from one end of hollow channel and flows out from the other end. However, rotating sealing assembly needs to be arranged at both inlet end and outlet end, which increases the probability of cooling liquid leakage when flywheel rotates, increases maintenance cost and reduces use stability. SUMMARY
[0003] The utility model discloses a bearing cooling device for flywheel system, which can reduce the number of rotating seals, reduce the risk of leakage caused by rotating seal wear, reduce maintenance cost, and improve the sealing reliability and stability of flywheel system during long-term operation.
[0004] To achieve this purpose, the utility model adopts the following technical scheme:
[0005] The bearing cooling device for flywheel system comprises:
[0006] The sealing end cover is fixedly connected to the support frame, and the sealing end cover is recessed with a cavity along the axial direction of the flywheel shaft. The flywheel shaft is coaxially sleeved with a rotating seal, and the inner ring of the rotating seal is attached to the outer wall of the flywheel shaft. The outer ring of the rotating seal is attached to the inner wall of the cavity. The inner wall of the cavity, the rotating seal and the inner wall of the cavity form a sealed cavity. The sealing end cover is provided with a flow-through port communicating with the sealed cavity.
[0007] A cooling liquid delivery pipe is arranged through and fixedly connected to the sealing end cover, and the cooling liquid delivery pipe is coaxially arranged with the flywheel shaft, one end of the cooling liquid delivery pipe is located outside the sealing cavity, and the other end of the cooling liquid delivery pipe is located inside the sealing cavity, the cooling liquid delivery pipe and the sealing cavity are in flow communication with cooling liquid, and the cooling liquid is used for cooling the first bearing.
[0008] Preferably, the bearing cooling device for the flywheel system further comprises:
[0009] A second bearing is arranged in the cavity, and the other end of the cooling liquid delivery pipe is rotationally connected to the cavity through the second bearing.
[0010] Preferably, the other end of the cooling liquid delivery pipe is provided with a liquid flow hole, the liquid flow hole is in communication with the sealing cavity and the flow channel of the cooling liquid delivery pipe, and the cooling liquid can flow through the liquid flow hole.
[0011] Preferably, the bearing cooling device for the flywheel system further comprises:
[0012] A heat transfer member is arranged in the cavity, and the abutting surface of the heat transfer member can be closely abutted to the inner wall of the cavity.
[0013] Preferably, the heat transfer member comprises:
[0014] A heat transfer body, the abutting surface of the heat transfer body can be closely abutted to the inner wall of the cavity;
[0015] A heat dissipation fin is arranged on the non-abutting surface of the heat transfer body.
[0016] Preferably, a leakage port is further arranged on the sealing end cover, the leakage port is arranged in a spaced manner with the flow port, the leakage port is in communication with the cavity, and the leakage port is located outside the sealing cavity, and the leakage port is used for discharging the cooling liquid leaked from the sealing cavity.
[0017] The utility model discloses beneficial effects:
[0018] By setting the single-end in and out cooling path, the entering and discharging of the cooling liquid are carried out through the same end of the flywheel shaft, only one rotary seal needs to be arranged between the rotating flywheel shaft and the fixed sealing end cover, the number of rotary seals is reduced, the leakage risk caused by the wear of the rotary seal is reduced, the maintenance cost is reduced, and the sealing reliability and stability of the flywheel system during long-term operation are improved. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1is a schematic view of the bearing cooling device for the flywheel system provided by the embodiment of the utility model;
[0020] Figure 2 is Figure 1 is a local enlarged view of A in the figure.
[0021] Figure 3 is a schematic view of the cooling liquid delivery pipe provided by the embodiment of the utility model.
[0022] in the figure:
[0023] 1, flywheel system; 11, support frame; 12, flywheel; 121, flywheel disc; 122, flywheel shaft; 1221, cavity; 13, first bearing;
[0024] 2, sealing end cover; 21, cavity; 22, flow-through port; 23, leakage port;
[0025] 3, rotary seal;
[0026] 4, cooling liquid delivery pipe; 41, liquid flow hole; 5, second bearing;
[0027] 6, heat transfer piece; 61, heat transfer body; 62, heat dissipation fin; 63, through channel;
[0028] 7, plugging cover; 71, groove. DETAILED DESCRIPTION
[0029] The utility model will be further explained in detail in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.
[0030] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated, 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 or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0031] In the utility model, unless another definite provision and limitation, first feature is in second feature "on" or "under" can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them.Moreover, first feature is in second feature "on", "above" and "upper surface" includes that first feature is in second feature directly above and obliquely above, or only indicates that first feature horizontal height is higher than second feature.First feature is in second feature "under", "below" and "under surface" includes that first feature is in second feature directly below and obliquely below, or only indicates that first feature horizontal height is less than second feature.
[0032] In the description of the embodiment, the terms "upper", "lower", "right", "left", "horizontal", "vertical", and "radial" refer to the orientation or position relationship shown in the drawings, which is only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.
[0033] The embodiment provides a bearing cooling device for a flywheel system, as shown in the figure, Figures 1-3 The flywheel system 1 comprises a support frame 11, a flywheel 12 and a first bearing 13; the flywheel 12 comprises a flywheel disc 121 and a flywheel shaft 122 connected with each other, the flywheel shaft 122 is provided with a cavity 1221 extending along the axial direction of the flywheel shaft 122, the flywheel shaft 122 is rotatably connected to the support frame 11 through the first bearing 13, one end of the flywheel shaft 122 is provided with an opening communicating with the cavity 1221, and the opposite end of the flywheel shaft 122 is blocked; the bearing cooling device for the flywheel system comprises a sealing end cover 2 and a cooling liquid delivery pipe 4; wherein the sealing end cover 2 is fixedly connected to the support frame 11, the sealing end cover 2 is recessed along the axial direction of the flywheel shaft 122 to form a cavity 21, the flywheel shaft 122 is coaxially sleeved with a rotary seal 3, the inner ring of the rotary seal 3 is attached to the outer wall of the flywheel shaft 122, the outer ring of the rotary seal 3 is attached to the inner wall of the cavity 21, and the inner wall of the cavity 21, the rotary seal 3 and the inner wall of the cavity 1221 form a sealed cavity, the sealing end cover 2 is provided with a flow port 22 communicating with the sealed cavity, the cooling liquid delivery pipe 4 is arranged through and fixedly connected to the sealing end cover 2, and the cooling liquid delivery pipe 4 is coaxially arranged with the flywheel shaft 122, one end of the cooling liquid delivery pipe 4 is located outside the sealed cavity, the opposite end of the cooling liquid delivery pipe 4 is located inside the sealed cavity, the cooling liquid delivery pipe 4 and the sealed cavity circulate cooling liquid, and the cooling liquid is used for cooling the first bearing 13.
[0034] During cooling, coolant enters the sealing cavity from one end of the coolant delivery pipe 4 or the flow port 22, cooling the sealing cavity and subsequently the inner ring of the first bearing 13. Afterward, it is discharged through the flow port 22 or one end of the coolant delivery pipe 4, which is connected to the sealing cavity. Since the coolant enters and exits through the same end of the flywheel shaft 122, only one rotary seal 3 needs to be installed between the rotating flywheel shaft 122 and the fixed sealing end cover 2. This reduces the number of rotary seals 3 used, thereby reducing the risk of leakage due to wear of the rotary seal 3, lowering maintenance costs, and improving the sealing reliability and stability of the flywheel system 1 during long-term operation.
[0035] Optionally, such as Figure 1 As shown, in this embodiment, coolant flows in through one end of the coolant delivery pipe 4 and flows into the sealed cavity from the opposite end of the coolant delivery pipe 4, then flows out from the flow port 22 communicating with the sealed cavity. In other embodiments, coolant may also flow in through the flow port 22 communicating with the sealed cavity, and flow into the coolant delivery pipe 4 from the opposite end of the coolant delivery pipe 4, then flow out from one end of the coolant delivery pipe 4, etc. No limitations are imposed here.
[0036] Optionally, in this embodiment, the cross-section of the cavity 1221 along the axial direction of the flywheel shaft 122 is circular. The circular cross-section increases the contact area between the coolant and the inner wall of the cavity 1221, thereby improving the cooling rate. In other embodiments, the cross-section of the cavity 1221 can also be square or other shapes, etc. No limitations are imposed here.
[0037] Optionally, in this embodiment, the coolant is cooling water. In other embodiments, the coolant may also be oil or other liquids, etc. No limitations are imposed here.
[0038] Optionally, such as Figure 1 As shown, in this embodiment, two first bearings 13 are provided, and the two first bearings 13 are arranged at intervals along the axial direction of the flywheel shaft 122. The two ends of the flywheel shaft 122 are rotatably connected to the support frame 11 through the two first bearings 13 respectively. The above arrangement makes the flywheel shaft 122 more stable when rotating.
[0039] Optionally, such as Figure 1 and Figure 3As shown in the embodiment, the cooling liquid delivery pipe 4 is a round pipe. The round pipe and the flywheel shaft 122 have the same cross-section, which improves the consistency of the structure. In other embodiments, the cooling liquid delivery pipe 4 can also be a square pipe or the like. It is only required to fill the cooling liquid into the sealed cavity, and no limitation is made herein. It should be noted that, in the embodiment, the cooling liquid delivery pipe 4 is made of stainless steel. The stainless steel is corrosion-resistant, and has high strength and hardness, and can withstand certain external impact and is not easy to deform. In other embodiments, the cooling liquid delivery pipe 4 can also be made of aluminum alloy or copper alloy or the like, and no limitation is made herein.
[0040] Further, as shown in Figure 1 and Figure 2 , the bearing cooling device for the flywheel system further comprises a second bearing 5, the second bearing 5 is arranged in the cavity 1221, and the opposite end of the cooling liquid delivery pipe 4 is rotatably connected to the cavity 1221 through the second bearing 5. The above arrangement provides support for the opposite end of the cooling liquid delivery pipe 4, and the opposite end of the cooling liquid delivery pipe 4 is rotatably connected to the cavity 1221 through the second bearing 5, so that when the flywheel shaft 122 rotates, the cooling liquid delivery pipe 4 remains stationary throughout, and is not associated with the rotation of the flywheel shaft 122, which ensures the stability and reliability of the cooling liquid delivery pipe 4.
[0041] Optionally, as shown in Figure 1 and Figure 2 , along the axial direction of the flywheel shaft 122, the opposite end of the flywheel shaft 122 is provided with a process port, and the bearing cooling device for the flywheel system further comprises a plugging cover 7, the plugging cover 7 is sealingly connected to the process port to plug the opposite end of the flywheel shaft 122. The arrangement of the plugging cover 7 can plug the cavity 1221, so that the cavity 1221 forms a structure with only one end open, which avoids leakage of the cooling water in the cavity 1221, and at the same time, the arrangement of the process port facilitates the placement of the heat transfer member 6 in the cavity 1221.
[0042] Specifically, as shown in Figure 2 , in the embodiment, the plugging cover 7 is connected to the process port in a plug-in manner. In other embodiments, the plugging cover 7 can also be threadedly connected to the process port or the like. No limitation is made herein.
[0043] Specifically, as shown in Figure 2As shown, the sealing cap 7 has a recessed groove 71 on one side facing the opening. The outer ring of the second bearing 5 is interference-fitted into the groove 71, and the opposite end of the coolant delivery pipe 4 is interference-fitted into the inner ring of the second bearing 5. The opposite end of the coolant delivery pipe 4 is rotatably connected to the sealing cap 7 via the second bearing 5. This rotatable connection between the opposite end of the coolant delivery pipe 4 and the sealing cap 7 allows the coolant delivery pipe 4 to fully extend into the cavity 1221, providing guidance for the coolant flowing within the coolant delivery pipe 4.
[0044] More specifically, such as Figure 2 As shown, in this embodiment, the opposite end of the coolant delivery pipe 4 is a cylindrical protrusion with a diameter smaller than the pipe diameter of the coolant delivery pipe 4. The cylindrical protrusion is rotatably connected to the sealing cap 7 via the second bearing 5. In other embodiments, the opposite end of the coolant delivery pipe 4 may also be a cylindrical protrusion with a diameter larger than the pipe diameter of the coolant delivery pipe 4, or the opposite end of the coolant delivery pipe 4 may also be a cylindrical protrusion with a diameter equal to the pipe diameter of the coolant delivery pipe 4. No limitation is imposed here.
[0045] Optionally, such as Figures 1-3 As shown, a flow hole 41 is provided at the opposite end of the coolant delivery pipe 4. The flow hole 41 connects the sealed cavity and the flow channel of the coolant delivery pipe 4, allowing coolant to flow through the flow hole 41. Cooling water flows in from one end of the coolant delivery pipe 4, flows at high speed within the coolant delivery pipe 4, and enters the cavity 1221 in a jet-like manner through the flow hole 41. The cooling water makes full contact with the inner wall of the cavity 1221, carrying away heat and thus achieving efficient heat dissipation.
[0046] Specifically, such as Figures 1-3 As shown, in this embodiment, multiple flow holes 41 are provided. The arrangement of multiple flow holes 41 accelerates the speed at which cooling water enters the cavity 1221, improving heat dissipation efficiency. More specifically, in this embodiment, sixteen flow holes 41 are provided, divided into four groups of four flow holes 41 each. The flow holes 41 in each group are evenly spaced along the circumference of the coolant delivery pipe 4, and the four groups of flow holes 41 are evenly spaced along the axial direction of the coolant delivery pipe 4. This allows the cooling water to enter the cavity 1221 from multiple directions when passing through the flow holes 41, improving the cooling efficiency of the flywheel shaft 122. In other embodiments, one, two, three, four, or more flow holes 41 may be provided; the number and arrangement of the flow holes 41 are not limited.
[0047] Optionally, such as Figure 2As shown, the bearing cooling device for the flywheel system further comprises a heat transfer member 6, which is accommodated in the cavity 1221 and has an abutting surface capable of closely abutting the inner wall of the cavity 1221. By arranging the heat transfer member 6, the contact area between the inner wall of the cavity 1221 and the cooling water in the cavity 1221 is increased, and thus the contact area between the cooling water in the cavity 1221 and the support frame 11 is increased, and the heat transfer efficiency of the support frame 11 is improved. It should be noted that in the embodiment, the heat transfer member 6 is a heat transfer cylinder, and in other embodiments, the heat transfer member 6 can also be a heat transfer block or a heat transfer plate, etc. This is not limited here.
[0048] Optionally, as shown in Figure 1 and Figure 2 In the embodiment, the heat transfer member 6 extends along the axial direction of the flywheel shaft 122, and the length of the heat transfer member 6 along the axial direction of the flywheel shaft 122 is greater than the length of the first bearing 13 along the axial direction of the flywheel shaft 122. The above arrangement further increases the contact area between the inner wall of the cavity 1221 and the heat transfer member 6, and thus improves the heat transfer efficiency of the first bearing 13.
[0049] Specifically, as shown in Figure 1 In the embodiment, two heat transfer members 6 are arranged, and each of the two heat transfer members 6 corresponds to one of the two first bearings 13. The above arrangement can realize synchronous heat dissipation of the inner rings of the first bearings 13 on both sides of the flywheel shaft 122. In other embodiments, the heat transfer member 6 can also be arranged as one, and the length of the heat transfer member 6 is the same as the length of the cavity 1221 along the axial direction of the flywheel shaft 122, so that the contact area between the heat transfer member 6 and the inner wall of the cavity 1221 is maximized, and the heat of the two first bearings 13 can be transferred at the same time, or the heat transfer member 6 is arranged as one, and the length of the heat transfer member 6 is greater than the length of the first bearing 13 along the axial direction of the flywheel shaft 122, and the heat transfer member 6 transfers heat to any one of the two first bearings 13, etc. This is not limited here.
[0050] Further optionally, as shown in Figure 2 The heat transfer member 6 comprises a heat transfer body 61 and a heat dissipation fin 62; the abutting surface of the heat transfer body 61 can closely abut the inner wall of the cavity 1221, and the heat dissipation fin 62 is arranged on the non-abutting surface of the heat transfer body 61. The heat dissipation fin 62 can increase the surface area of the heat transfer body 61, so that the cooling water can more fully contact the heat transfer member 6. At the same time, the heat dissipation fin 62 can also disturb the flow of the cooling water, and thus the heat transfer effect between the cooling water and the heat dissipation fin 62 is enhanced, and the heat exchange efficiency is improved.
[0051] Further, as shown in Figure 2As shown, the heat transfer member 6 is provided with a penetrating channel 63, and the cooling liquid delivery pipe 4 penetrates in the penetrating channel 63, and the heat transfer member 6 can rotate around the axis of the cooling liquid delivery pipe 4 relative to the cooling liquid delivery pipe 4.
[0052] Optionally, the heat transfer member 6 is made of aluminum alloy material. The aluminum alloy has high thermal conductivity, which can absorb the heat of the first bearing 13 faster, and transfer the heat of the first bearing 13 to the cooling water in the sealed cavity. In other embodiments, the heat transfer member 6 can also be made of titanium alloy material or copper alloy material, etc., which is not limited here.
[0053] Further, as shown, Figure 1 The sealing end cover 2 is also provided with a leakage port 23, which is spaced apart from the flow-through port 22, and the leakage port 23 communicates with the cavity 21, and the leakage port 23 is located outside the sealed cavity, and the leakage port 23 is used to discharge the cooling liquid leaked from the sealed cavity. In the working process of the bearing cooling device for the flywheel system, when the rotary seal 3 is worn or damaged, the cooling water in the sealed cavity can leak from the rotary seal 3 to the outside of the sealed cavity, and then flow out from the leakage port 23. The above-mentioned arrangement can collect and monitor the leaked cooling water, reduce the risk of cooling water leakage, and understand the wear condition of the rotary seal 3 according to the leakage condition of the cooling water in the leakage port 23, and carry out preventive maintenance on the bearing cooling device of the flywheel system 1. It should be noted that, as shown, Figure 1 In other embodiments, the leakage port 23 is arranged at the lower end of the sealing end cover 2 along the vertical radial direction of the flywheel shaft 122, and the flow-through port 22 can be arranged at any position of the sealing end cover 2 along the circumferential direction of the flywheel shaft 122, which can ensure that the flow-through port 22 communicates with the sealed cavity. Etc. This is not limited here.
[0054] Specifically, as shown, Figure 1 In this embodiment, the inner wall of the cavity 21, the outer wall of the flywheel shaft 122, the rotary seal 3 and the support frame 11 form a leakage cavity, the leakage port 23 communicates with the leakage cavity, and the leakage cavity is separated from the sealed cavity by the rotary seal 3.
[0055] The cooling water flow path of the bearing cooling device for the flywheel system will be described below: Figures 1-3
[0056] The cooling water enters the channel in the cooling liquid delivery pipe 4 from one end of the cooling liquid delivery pipe 4, flows to the opposite end of the cooling liquid delivery pipe 4, and then enters the cavity 1221 through the plurality of liquid flow holes 41, and then flows in the annular cavity formed between the outer wall of the cooling liquid delivery pipe 4 and the inner wall of the flywheel shaft 122 and returns to the flow port 22 in the sealing end cover 2, and then is discharged through the flow port 22, cools the sealing cavity, and then cools the inner ring of the first bearing 13. If the rotary seal 3 wears during rotation of the flywheel shaft 122, part of the cooling water in the sealing cavity will leak to the leakage cavity outside the sealing cavity through the rotary seal 3, and then be discharged through the leakage port 23.
[0057] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. Bearing cooling device for a flywheel system, the flywheel system (1) comprising: The support frame (11), the flywheel (12) and the first bearing (13); the flywheel (12) comprises a flywheel disc (121) and a flywheel shaft (122) connected with each other, a cavity (1221) extending along the axial direction of the flywheel shaft (122) is formed in the flywheel shaft (122), and the flywheel shaft (122) is rotationally connected to the support frame (11) through the first bearing (13); characterized in that one end of the flywheel shaft (122) is provided with an opening in communication with the cavity (1221), and the opposite end of the flywheel shaft (122) is blocked; and the bearing cooling device for the flywheel system comprises: a sealing end cover (2) fixedly connected to the support frame (11), wherein a cavity (21) is recessed in the sealing end cover (2) along the axial direction of the flywheel shaft (122), the flywheel shaft (122) is coaxially sleeved with a rotary seal (3), the inner ring of the rotary seal (3) is attached to the outer wall of the flywheel shaft (122), the outer ring of the rotary seal (3) is attached to the inner wall of the cavity (21), and the inner wall of the cavity (21), the rotary seal (3) and the inner wall of the cavity (1221) form a sealed cavity; and a flow port (22) in communication with the sealed cavity is arranged on the sealing end cover (2); a cooling liquid delivery pipe (4) penetratingly and fixedly connected to the sealing end cover (2), wherein the cooling liquid delivery pipe (4) is coaxially arranged with the flywheel shaft (122), one end of the cooling liquid delivery pipe (4) is located outside the sealed cavity, the opposite end of the cooling liquid delivery pipe (4) is located inside the sealed cavity, the cooling liquid delivery pipe (4) and the sealed cavity are in communication with cooling liquid, and the cooling liquid is used for cooling the first bearing (13).
2. The bearing cooling apparatus for a flywheel system according to claim 1, characterized by, The bearing cooling device for the flywheel system further comprises: a second bearing (5) arranged in the cavity (1221), and the opposite end of the cooling liquid delivery pipe (4) is rotationally connected to the cavity (1221) through the second bearing (5).
3. The bearing cooling apparatus for a flywheel system according to claim 1, characterized by, The opposite end of the cooling liquid delivery pipe (4) is provided with a liquid flow hole (41) in communication with the sealed cavity and the flow channel of the cooling liquid delivery pipe (4), and the cooling liquid can flow through the liquid flow hole (41).
4. A bearing cooling arrangement for a flywheel system as claimed in any one of claims 1 to 3, characterised in that, The bearing cooling device for the flywheel system further comprises: a heat transfer member (6) accommodated in the cavity (1221), and the abutting surface of the heat transfer member (6) can be closely attached to the inner wall of the cavity (1221).
5. The bearing cooling apparatus for a flywheel system according to claim 4, wherein The heat transfer member (6) comprises: a heat transfer body (61), wherein the abutting surface of the heat transfer body (61) can be closely attached to the inner wall of the cavity (1221); a heat dissipation fin (62) arranged on the non-abutting surface of the heat transfer body (61).
6. The bearing cooling apparatus for a flywheel system according to any one of claims 1 to 3, characterized by, The sealing end cover (2) is further provided with a leakage port (23), the leakage port (23) is arranged at intervals with the flow-through port (22), the leakage port (23) is communicated with the cavity (21), and the leakage port (23) is located outside the sealing cavity, and the leakage port (23) is used for discharging the leaked cooling liquid from the sealing cavity.