Cooling system of fan foundation buried cable
By setting up a closed end pipe in the underground cable system of the fan foundation to form a cooling channel, and using the blower to achieve air-cooled heat dissipation, the cable heat dissipation problem caused by insufficient fan foundation space is solved, and the thermal stability and current carrying capacity of the cable are ensured. And reduces the cost of the project.
Patent Information
- Application Number
- CN202420381227.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-29
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-02-28
AI Technical Summary
The insufficient space in the fan foundation leads to the heat dissipation problem of buried cables, affecting the thermal stability and current carrying capacity of the cables.
A cooling system for basic underground cables of fans is designed. By setting closed end pipes at both ends of low-voltage cable pipes, a cooling channel is formed, and a blower is used to achieve air-cooling and heat dissipation.
The spacing between low-voltage cables is effectively reduced, the problem of insufficient internal space of the fan foundation is solved, the thermal stability and design current carrying capacity of the cable are ensured, and the engineering cost is reduced.
Smart Images
Figure CN222508629U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of underground cable construction for a fan foundation in a new energy project, and in particular relates to a cooling system for an underground cable for a fan foundation. Background Art
[0002] With the rapid development of wind turbine technology, the capacity of wind turbines has increased year by year. As of January 2024, the capacity of onshore wind farms has begun to use 7WM models. As the capacity of wind turbines increases, the output voltage of wind turbines increases. Correspondingly, the current output by wind turbine generators increases, resulting in an increase in the number of cables between wind turbines and transformers. The number of cables has increased from a few to more than twenty. In order to facilitate construction and reduce the intersection of the cable outer protection tube and the steel structure of the wind turbine foundation, the buried cable usually passes through the center of the wind turbine foundation (the conventional construction plan is that one end of the low-voltage cable tube passes through the wind turbine foundation in an underground manner and extends from the top of the wind turbine foundation, and the other end of the low-voltage cable tube extends into the box-type transformer foundation. The low-voltage cable tubes are arranged side by side, and the low-voltage cables are arranged one by one in the low-voltage cable tube). Usually, the increase in the capacity of wind turbines does not cause a significant increase in the diameter of the wind turbine foundation, so the space for buried cables in the wind turbine foundation is often limited. With the increase in the number of cables, because the heat dissipation of the cables needs to be considered, a certain distance must be maintained between the cables, otherwise it will affect the thermal stability and current carrying capacity of the cables. The existing conventional construction scheme has the problem of insufficient space in the wind turbine foundation. For the convenience of construction, usually only the enlargement of the wind turbine foundation can be considered, which will greatly increase the construction cost. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a cooling system for underground cables of a fan foundation to solve the problem of insufficient space in the fan foundation.
[0004] In order to solve the above-mentioned technical problems, the utility model provides the following technical solutions: a cooling system for underground cables of a fan foundation, comprising a low-voltage cable tube, a low-voltage cable, a fan foundation and a box-type transformer foundation, one end of the low-voltage cable tube passes through the fan foundation in an underground manner and extends out from the top of the fan foundation, the other end of the low-voltage cable tube extends into the box-type transformer foundation, there are multiple low-voltage cable tubes arranged side by side, the low-voltage cables are arranged one by one in the low-voltage cable tubes, the outer diameter of the low-voltage cable is smaller than the inner diameter of the low-voltage cable tube, both ends of each low-voltage cable tube are equipped with closed end tubes, the closed end tubes are sealed and connected to the low-voltage cable tube, the low-voltage cable passes through the inner hole at the outer end of the closed end tube, and the outer surface of the low-voltage cable is in close contact with the inner hole at the outer end of the closed end tube; a cooling channel is formed in the interval space between the inner wall of the low-voltage cable tube and the outer surface of the low-voltage cable, one end of the cooling channel is equipped with an air inlet, and a blower is connected through the air inlet, and the other end of the cooling channel is equipped with an exhaust port.
[0005] A further preferred scheme is that two low-voltage cable pipes form a group of independent cooling channels, and the two low-voltage cable pipes in the same group are respectively set as cable pipe A and cable pipe B. The closed end pipe corresponding to the end of cable pipe A located at the fan foundation and the closed end pipe corresponding to the end of cable pipe B located at the fan foundation are connected through an intermediate pipe, the closed end pipe corresponding to the end of cable pipe A located inside the box-type transformer foundation is arranged to connect to the air inlet of the blower, and the closed end pipe corresponding to the end of cable pipe B located inside the box-type transformer foundation is arranged with an exhaust outlet.
[0006] A further preferred solution is that the closed end tube corresponding to the end of the cable tube A located at the fan foundation, the closed end tube corresponding to the end of the cable tube B located at the fan foundation and the intermediate pipe are an integrally formed structure.
[0007] A further preferred solution is that a temperature sensor is provided on the outer surface of each low-voltage cable near the end of the low-voltage cable tube, and the temperature sensor and the blower are electrically connected to the controller.
[0008] A further preferred solution is that the temperature sensor is bonded and fixed to the outer surface of the low-voltage cable.
[0009] A further preferred solution is that the air inlet is provided with a fine mesh net.
[0010] Compared with the prior art, the beneficial effects of the utility model are as follows: by setting a closed end tube so that the space between the inner wall of the low-voltage cable tube and the outer surface of the low-voltage cable forms a cooling channel, and by using a blower to achieve effective heat dissipation of the buried cable in the form of air cooling, the spacing between low-voltage cables can be effectively reduced under the premise of meeting the thermal stability of the cable and the designed current carrying capacity, thereby solving the problem of insufficient buried space for low-voltage cable tubes inside the fan foundation caused by the increase in the number of large-capacity fan cables. Compared with the method of increasing the internal space of the fan foundation by increasing the diameter of the fan foundation, the utility model has a greater advantage in cost and can greatly reduce the project cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0012] Figure 2 It is a schematic diagram of the local structure of the utility model on one side of the fan foundation.
[0013] Figure 3 It is a schematic diagram of the local structure of the utility model on one side of the box-type transformer foundation.
[0014] Figure 4This is a schematic diagram of the cross-sectional structure of one group of cooling channels of the utility model (two low-voltage cable tubes form a group).
[0015] The markings in the figure are: 1- low-voltage cable pipe; 2- low-voltage cable; 3- fan foundation; 4- box-type transformer foundation; 5- air inlet; 6- blower; 7- exhaust outlet; 8- closed end pipe; 9- intermediate pipe; 10- temperature sensor; 11- controller. DETAILED DESCRIPTION
[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0017] See also Figures 1 to 4 The main structure of the utility model during specific implementation is the same as that of the prior art, including a low-voltage cable pipe 1, a low-voltage cable 2, a fan foundation 3 and a box-type transformer foundation 4. One end of the low-voltage cable pipe 1 passes through the fan foundation 3 in an underground manner and extends from the top of the fan foundation 3. The other end of the low-voltage cable pipe 1 extends into the box-type transformer foundation 4. The low-voltage cable pipes 1 are arranged in parallel, and the low-voltage cables 2 are arranged in the low-voltage cable pipes 1 one by one. The outer diameter of the low-voltage cable 2 is smaller than the inner diameter of the low-voltage cable pipe 1. The key technical point of the utility model is that both ends of each low-voltage cable tube 1 are equipped with closed end tubes 8, the closed end tubes 8 are sealed and connected to the low-voltage cable tube 1, the low-voltage cable 2 passes through the inner hole of the outer end of the closed end tube 8, and the outer surface of the low-voltage cable 2 is in close contact with the inner hole of the outer end of the closed end tube 8; the interval space between the inner wall of the low-voltage cable tube 1 and the outer surface of the low-voltage cable 2 forms a cooling channel, one end of the cooling channel is equipped with an air inlet 5, and a blower 6 is connected through the air inlet 5, and the other end of the cooling channel is equipped with an exhaust port 7.
[0018] In specific implementation, there can be a variety of sealing connection methods between the closed end tube 8 and the low-voltage cable tube 1, as long as reliable sealing can be achieved and disassembly and maintenance are convenient. For example, a rubber pipe joint can be directly used for sleeve connection, or a connection method such as "threaded connection + elastic sealing ring" or "snap connection + elastic sealing ring" can be used. In order to facilitate reliable sealing, an elastic sealing ring can be further added to the contact surface between the inner hole at the outer end of the closed end tube 8 and the outer surface of the low-voltage cable 2. The utility model forms a cooling channel in the spacing space between the inner wall of the low-voltage cable tube 1 and the outer surface of the low-voltage cable 2 by setting a closed end tube 8, and effectively dissipates heat from the buried cable in the form of air cooling through the blower 6. Under the premise of meeting the thermal stability of the cable and the designed current carrying capacity, the spacing between the low-voltage cables can be effectively reduced, thereby solving the problem of insufficient buried space for the low-voltage cable tube inside the fan foundation caused by the increase in the number of cables for large-capacity fans.
[0019] It is understandable that each low-voltage cable tube 1 can form an independent cooling channel, or multiple low-voltage cable tubes 1 can be connected end to end to form a group of cooling channels. Taking into account factors such as heat dissipation efficiency, simple construction, and convenient operation and maintenance, the preferred solution adopted by the utility model is that two low-voltage cable tubes 1 form a group of independent cooling channels, and the two low-voltage cable tubes 1 in the same group are respectively set as cable tube A tube and cable tube B tube. The closed end tube 8 corresponding to the end of cable tube A located at the fan foundation 3 and the closed end tube 8 corresponding to the end of cable tube B located at the fan foundation 3 are connected through the intermediate pipeline 9, and the closed end tube 8 corresponding to the end of cable tube A located in the box-type transformer foundation 4 is provided for connecting the air inlet 5 of the blower 6, and the closed end tube 8 corresponding to the end of cable tube B located in the box-type transformer foundation 4 is provided with an exhaust port 7. For the convenience of construction, usually, the closed end tube 8 corresponding to the end of the cable tube A located at the fan foundation 3, the closed end tube 8 corresponding to the end of the cable tube B located at the fan foundation 3 and the intermediate pipe 9 are designed as an integral structure. The inner diameter of the low-voltage cable tube 1 can be specifically calculated according to the requirements of the heat dissipation and ventilation volume. Usually, the inner diameter of the low-voltage cable tube 1 should not be less than 1.5 times the outer diameter of the low-voltage cable 2, that is, the inner diameter of the low-voltage cable tube 1 is greater than 1.5 times the outer diameter of the low-voltage cable 2.
[0020] In order to save energy and reduce operating costs, preferably, a temperature sensor 10 is provided on the outer surface of each low-voltage cable 2 near the end of the low-voltage cable tube 1, and the temperature sensor 10 and the blower 6 are electrically connected to the controller 11. The controller 11 can control the switch action of the blower 6 by detecting the temperature value obtained by the temperature sensor 10. When the surface temperature of the cable exceeds the set value, the blower 6 is turned on, and when the surface temperature of the cable drops to the set value, the blower 6 is turned off. It can be understood that controlling the start and stop of the motor by the temperature threshold is a conventional control procedure in the field, and the utility model does not involve the improvement of the computer program. The temperature sensor 10 is set at a position close to the end of the low-voltage cable tube 1, which can be easily replaced and maintained.
[0021] For ease of implementation, the preferred fixing method of the temperature sensor 10 is to bond and fix it to the outer surface of the low-voltage cable 2 .
[0022] Preferably, the air inlet 5 is provided with a dense mesh to prevent debris from entering the low-voltage cable tube 1. In specific implementation, the dense mesh of the air inlet 5 should be cleaned regularly.
Claims
1. A cooling system for underground cables in a fan foundation, comprising a low-voltage cable tube (1), a low-voltage cable (2), a fan foundation (3) and a box-type transformer foundation (4), wherein one end of the low-voltage cable tube (1) passes through the fan foundation (3) in an underground manner and then extends from the top of the fan foundation (3), and the other end of the low-voltage cable tube (1) extends into the box-type transformer foundation (4), a plurality of low-voltage cable tubes (1) are arranged side by side, and the low-voltage cables (2) are arranged one by one in the low-voltage cable tubes (1), and the outer diameter of the low-voltage cable (2) is smaller than the inner diameter of the low-voltage cable tube (1), and the system is characterized in that: Both ends of each low-voltage cable tube (1) are provided with closed end tubes (8), the closed end tubes (8) are sealedly connected to the low-voltage cable tube (1), the low-voltage cable (2) passes through the inner hole at the outer end of the closed end tube (8), and the outer surface of the low-voltage cable (2) is in close contact with the inner hole at the outer end of the closed end tube (8); the interval space between the inner wall of the low-voltage cable tube (1) and the outer surface of the low-voltage cable (2) forms a cooling channel, one end of the cooling channel is provided with an air inlet (5), and a blower (6) is connected through the air inlet (5), and the other end of the cooling channel is provided with an air outlet (7).
2. The cooling system for the underground cable of the fan foundation according to claim 1, characterized in that: Two low-voltage cable tubes (1) form a group of independent cooling channels. The two low-voltage cable tubes (1) in the same group are respectively set as cable tube A and cable tube B. The closed end tube (8) corresponding to the end of cable tube A located at the fan foundation (3) and the closed end tube (8) corresponding to the end of cable tube B located at the fan foundation (3) are connected through an intermediate pipe (9). The closed end tube (8) corresponding to the end of cable tube A located inside the box-type transformer foundation (4) is provided for connecting to an air inlet (5) of a blower (6), and the closed end tube (8) corresponding to the end of cable tube B located inside the box-type transformer foundation (4) is provided with an air outlet (7).
3. The cooling system for the underground cable of the fan foundation according to claim 2, characterized in that: The closed end tube (8) corresponding to the end of the cable tube A located on the fan foundation (3), the closed end tube (8) corresponding to the end of the cable tube B located on the fan foundation (3), and the intermediate pipe (9) form an integral structure.
4. The cooling system for the underground cable of the fan foundation according to any one of claims 1 to 3, characterized in that: A temperature sensor (10) is provided on the outer surface of each low-voltage cable (2) at a position close to the end of the low-voltage cable tube (1), and the temperature sensor (10) and the blower (6) are both electrically connected to a controller (11).
5. The cooling system for the underground cable of the fan foundation according to claim 4, characterized in that: The temperature sensor (10) is bonded and fixed to the outer surface of the low-voltage cable (2).
6. The cooling system for the underground cable of the fan foundation according to any one of claims 1 to 3, characterized in that: The air inlet (5) is provided with a dense mesh.