An integrated water cooling system under an offshore wind turbine tower and a water cooling control method

Abstract

The present invention provides an integrated water cooling system under an offshore wind turbine tower and a water cooling control method, which relate to the field of wind power generation. Two of the four components, namely, a built-in environmental control radiator, a variable flow heat exchanger, a rotor step-up heat exchanger, and a unit step-up heat exchanger, are connected in series to a first pipeline, and the other two are connected in series to a second pipeline. In an external circulation mode, the first pipeline and the second pipeline form a parallel pipeline, and coolant flows through the first pipeline and the second pipeline in parallel at the same time. At this time, the external air-water radiator participates in heat dissipation, and heat is transferred to the outside for dissipation. The heat dissipation power of this mode is relatively large. In an internal circulation mode, the first pipeline and the second pipeline are connected in series to form a circulation pipeline, and the pump group module drives the coolant to circulate in the circulation pipeline. At this time, the external air-water radiator does not participate in heat dissipation, and heat is transferred from the built-in environmental control radiator to other positions of the wind turbine. The heat dissipation power of this mode is relatively small. The present invention can realize the cooling power adjustment of the offshore wind turbine tower and can be applied to different working conditions.

Description

Technical Field

[0001] The present invention relates to the field of wind power generation, and further relates to an integrated water cooling system under an offshore wind turbine tower. Furthermore, the present invention also relates to a water cooling control method. Background Art

[0002] The water cooling system is primarily used to cool heat-generating components, ensuring normal operation at a constant temperature. The operating conditions of large-megawatt offshore wind turbines are characterized by the following characteristics: 1) The installation and operating environment is harsh, requiring high airtightness within the nacelle and tower; 2) Key high-voltage components, primarily converters and transformers, are located within the tower. Transformers are categorized as either dry or oil-cooled, requiring significant heat dissipation.

[0003] Due to the characteristics of the units under offshore wind turbine towers, the cooling system is required to meet both anti-corrosion requirements and ensure the reliability of key power generation components under the tower. It is necessary to prevent corrosive air from entering the interior of the wind turbine tower. Therefore, traditional air cooling technologies such as direct cooling and air cooling are no longer applicable.

[0004] Traditional cooling methods utilize both internal and external cooling. These methods deliver heat at a constant power level and are unable to adjust to environmental variations, resulting in energy waste. For those skilled in the art, achieving cooling power regulation for offshore wind turbine towers is a pressing technical challenge. Summary of the Invention

[0005] The present invention provides an integrated water cooling system under an offshore wind turbine tower, which can switch between different modes to achieve power switching and meet different heat dissipation requirements. The specific scheme is as follows:

[0006] An integrated water cooling system under an offshore wind turbine tower comprises a pump group module, an external air-to-water radiator, a built-in environmental control radiator, a converter heat exchanger, a rotor boost-to-converter heat exchanger, and a unit boost-to-converter heat exchanger, wherein: two of the built-in environmental control radiator, the converter heat exchanger, the rotor boost-to-converter heat exchanger, and the unit boost-to-converter heat exchanger are connected in series to a first pipeline, and the other two are connected in series to a second pipeline; the first pipeline and the second pipeline are connected in parallel to a circulation pipeline formed by the pump group module and the external air-to-water radiator; the integrated water cooling system under an offshore wind turbine tower can switch between two different cooling modes: external circulation mode: the first pipeline and the second pipeline form a parallel pipeline, and the pump group module drives the coolant to circulate through the parallel pipeline and the external air-to-water radiator; internal circulation mode: the first pipeline and the second pipeline are connected in series to form a circulation pipeline, and the pump group module drives the coolant to circulate in the circulation pipeline.

[0007] Optionally, the variable heat exchanger and the rotor boost heat exchanger are arranged in the first pipeline; the built-in environmental control radiator and the unit boost heat exchanger are arranged in the second pipeline.

[0008] Optionally, the pump group module includes a motor, a water pump, and an electric three-way valve. The motor drives the water pump to provide power for the coolant; the electric three-way valve is used to control the switching between the external circulation mode and the internal circulation mode.

[0009] Optionally, the interface of the electric three-way valve is connected by a quick-release clamp.

[0010] Optionally, both the external air-to-water radiator and the built-in environmental control radiator adopt forced air cooling.

[0011] Optionally, the pump group module includes an expansion tank for stabilizing the pressure of the coolant;

[0012] And / or, the pump module includes an automatic exhaust valve for automatically removing gas from the system coolant;

[0013] And / or, the pump module includes a pressure transmitter for monitoring changes in the pressure value inside the pipeline and displaying the pressure value through a pressure gauge;

[0014] And / or, the pump group module includes a heater for heating the coolant in the pipeline;

[0015] And / or, the pump module includes a flow meter for monitoring the flow of coolant in the circuit;

[0016] And / or, a temperature sensor is also included to monitor temperature changes in the pipeline.

[0017] Optionally, the built-in environmental control radiator is provided with an enclosure or is not provided with an enclosure;

[0018] The built-in environmental control radiator with enclosure is used to absorb the hot air in the tower layer and the next layer, cool it with cold water, and then blow the air to the upper layer with the help of flexible air guide tube;

[0019] The built-in environmental control radiator without enclosure is used to absorb the hot air in the next layer of space in the tower, cool it with cold water, and then blow the air to the space of this layer.

[0020] The present invention also provides a water cooling control method, which is applied to the integrated water cooling system under the offshore wind turbine tower described in any one of the above items, including an external circulation mode and an internal circulation mode. In the external circulation mode, the first pipeline and the second pipeline form a parallel pipeline, and the pump group module drives the coolant to circulate through the parallel pipeline and the external air-water radiator;

[0021] When in the internal circulation mode, the first pipeline and the second pipeline are connected in series to form a circulation pipeline, and the pump group module drives the coolant to circulate in the circulation pipeline;

[0022] When the following conditions are met at the same time, switch to external circulation mode:

[0023] A Electric three-way valve opening command = 1; B Electric three-way valve closing command = 0; C Motor starts, or the water temperature at the outlet of the external air-water radiator is greater than the set value;

[0024] When the following conditions are met at the same time, switch to the internal circulation mode:

[0025] A Electric three-way valve opening command = 0; B Electric three-way valve closing command = 1; C Motor is turned off, or the water temperature at the outlet of the external air-water radiator is lower than the set value.

[0026] Optionally, the motor start logic is:

[0027] When neither "pressure detected by pressure transmitter is too low" nor "pressure detected by pressure transmitter is too high" exists, any of the following conditions is met: A. The unit is connected to the grid; B. The outlet temperature of the radiator outside the water cooling system is too high or the component to be cooled issues a cooling request; C. The step-up transformer temperature is higher than the set temperature value; D. Any of the transformer cooling fans is started;

[0028] The stopping logic of the motor is:

[0029] When the "pressure detected by the pressure transmitter is too low or too high" is triggered, the motor and water pump are shut down, and any of the following conditions are met at the same time: A. The unit is shut down; B. The outlet temperature of the radiator outside the water cooling system is lower than a set value and no cooling request is received from the component to be cooled; C. The temperature of the step-up transformer is lower than the stop temperature of the step-up transformer oil pump; D. Any of the transformer cooling fans is stopped.

[0030] The present invention provides an integrated water cooling system under an offshore wind turbine tower, in which two of the four built-in environmental control radiators, variable flow heat exchangers, rotor step-up heat exchangers, and unit step-up heat exchangers are connected in series to a first pipeline, and the other two are connected in series to a second pipeline; in an external circulation mode, the first pipeline and the second pipeline form a parallel pipeline, and the first pipeline and the second pipeline are connected in parallel and flow through the coolant at the same time. At this time, the external air-water radiator participates in the heat dissipation, and the heat is transferred to the outside for dissipation. The heat dissipation power of this mode is relatively large; in an internal circulation mode, the first pipeline and the second pipeline are connected in series to form a circulation pipeline, and the pump group module drives the coolant to circulate in the circulation pipeline. At this time, the external air-water radiator does not participate in the heat dissipation, and the heat is transferred from the built-in environmental control radiator to other positions of the wind turbine. The heat dissipation power of this mode is relatively small. The present invention can realize the cooling power adjustment of the offshore wind turbine tower and can be applied to different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A schematic structural diagram of a specific embodiment of the integrated water cooling system for offshore wind turbines provided by the present invention;

[0033] Figure 2 This is a schematic structural diagram of a specific embodiment of a pump module;

[0034] Figure 3 for Figure 2 A partial enlarged view of the dotted circle;

[0035] Figure 4 This is a schematic diagram of the principle of the external circulation mode;

[0036] Figure 5 This is a schematic diagram of the principle of the internal circulation mode.

[0037] The diagram includes:

[0038] Pump group module 1, motor 11, water pump 12, expansion tank 13, pressure transmitter 14, automatic exhaust valve 15, heater 16, pressure gauge 17, flow meter 18, electric three-way valve 19, quick-release clamp 191, external air-water radiator 2, built-in environmental control radiator 3, variable flow heat exchanger 4, rotor boost heat exchanger 5, unit boost heat exchanger 6, first pipeline 7, second pipeline 8. DETAILED DESCRIPTION

[0039] The core of the present invention is to provide an integrated water cooling system under the offshore wind turbine tower, which can switch between different modes to achieve power switching and meet different heat dissipation requirements.

[0040] In order to enable those skilled in the art to better understand the technical solution of the present invention, the integrated water cooling system under the offshore wind turbine tower of the present invention will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0041] The present invention provides an integrated water cooling system under an offshore wind turbine tower, comprising a pump module 1, an external air-to-water radiator 2, a built-in environmental control radiator 3, a variable flow heat exchanger 4, a rotor boost heat exchanger 5, a unit boost heat exchanger 6 and other components, which together constitute a system structure that can realize cooling and heat dissipation functions. The pump group module 1 is used to provide power for the flow of coolant; the external air-to-water radiator 2 is arranged on the outside of the offshore wind turbine tower to dissipate heat to the outside; the built-in environmental control radiator 3 is arranged inside the offshore wind turbine tower to transfer the heat of the internal heating elements to other parts inside the offshore wind turbine tower; the converter heat exchanger 4 is installed on the converter to absorb the heat of the converter, and the heat of the converter is transferred to the converter heat exchanger 4; the heating elements in the offshore wind turbine tower mainly include the converter, the rotor boost transformer (dry-type transformer) and the unit boost transformer (oil-type transformer), the rotor boost transformer heat exchanger 5 is installed on the rotor boost transformer to absorb the heat of the rotor boost transformer, and the heat of the rotor boost transformer is transferred to the rotor boost transformer heat exchanger 5; the unit boost transformer heat exchanger 6 is installed on the unit boost transformer to absorb the heat of the unit boost transformer, and the heat of the unit boost transformer is transferred to the unit boost transformer heat exchanger 6. The converter heat exchanger 4, the rotor boost heat exchanger 5, and the unit boost heat exchanger 6 are located on the pipeline. The coolant takes out the heat when passing through the three and dissipates the heat when reaching the external air-water radiator 2 or the built-in environmental control radiator 3.

[0042] Two of the four structures, namely, the built-in environmental control radiator 3, the variable heat exchanger 4, the rotor boost heat exchanger 5, and the unit boost heat exchanger 6, are connected in series to the first pipeline 7, and the other two are connected in series to the second pipeline 8; the four structures, namely, the built-in environmental control radiator 3, the variable heat exchanger 4, the rotor boost heat exchanger 5, and the unit boost heat exchanger 6, are divided into two groups.

[0043] The first pipeline 7 and the second pipeline 8 are connected in parallel to the circulation pipeline formed by the pump group module 1 and the external air-water radiator 2; in the circulation pipeline formed by the pump group module 1 and the external air-water radiator 2, the first pipeline 7 and the second pipeline 8 form a parallel relationship and can flow water in parallel, but the first pipeline 7 and the second pipeline 8 can also operate in a series water flow manner.

[0044] The integrated water cooling system under the offshore wind turbine tower can switch between two different cooling modes: external circulation mode and internal circulation mode.

[0045] External circulation mode: The first pipeline 7 and the second pipeline 8 form a parallel pipeline, and the pump module 1 drives the coolant to circulate through the parallel pipeline and the external air-water radiator 2; the pump module 1 drives the coolant to flow, which is divided into two independent pipelines. The coolant can pass through the first pipeline 7 and the second pipeline 8 at the same time and finally merge together; the variable heat exchanger 4, the rotor boost heat exchanger 5, and the unit boost heat exchanger 6 each absorb heat. When the coolant passes through the built-in environmental control radiator 3 and the external air-water radiator 2, it dissipates heat. Part of the heat is dissipated to other locations inside the offshore wind turbine through the built-in environmental control radiator 3, and part of the heat is dissipated to the outside through the external air-water radiator 2. At this time, the external air-water radiator 2 participates in the heat dissipation process. In the external circulation mode, the external air-water radiator 2 and the built-in environmental control radiator 3 participate in heat dissipation at the same time, and the heat dissipation cooling power is relatively high.

[0046] Internal circulation mode: The first pipeline 7 and the second pipeline 8 are connected in series to form a circulation pipeline, and the pump group module 1 drives the coolant to circulate in the circulation pipeline. The first pipeline 7 and the second pipeline 8 are connected to each other to form a passage. The coolant circulates in the first pipeline 7 and the second pipeline 8. The converter heat exchanger 4, the rotor boost heat exchanger 5, and the unit boost heat exchanger 6 each absorb heat. When the coolant passes through the built-in environmental control radiator 3, it dissipates heat. At this time, the external air-water radiator 2 does not participate in the heat dissipation process, and only the built-in environmental control radiator 3 participates in the heat dissipation. In the internal circulation mode, only the built-in environmental control radiator 3 participates in the heat dissipation, and the heat dissipation cooling power is low.

[0047] The integrated water cooling system under the offshore wind turbine tower of the present invention can realize the cooling power adjustment of the offshore wind turbine tower and can be applied to different working conditions. When the heat dissipation demand is large, the external circulation mode is adopted, and when the heat dissipation demand is small, the internal circulation mode is adopted. Different heat dissipation powers are reasonably arranged according to the heat dissipation demand, and low-power and high-power water cooling inside and outside the tower is realized, thereby reducing energy consumption while meeting the heat dissipation demand.

[0048] Combine Figure 4 、 Figure 5 As shown, the present invention provides a specific embodiment, wherein the variable heat exchanger 4 and the rotor boost heat exchanger 5 are arranged in the first pipeline 7; the built-in environmental control radiator 3 and the unit boost heat exchanger 6 are arranged in the second pipeline 8. Figure 4 In the external circulation mode, one cooling fluid outputted by the pump module 1 passes through the converter heat exchanger 4 and the rotor boost heat exchanger 5, and the other cooling fluid passes through the built-in environmental control radiator 3 and the unit boost heat exchanger 6. Figure 5 In the internal circulation mode, the coolant output by the pump module 1 passes through the built-in environmental control radiator 3, the variable heat exchanger 4, the rotor boost heat exchanger 5, and the unit boost heat exchanger 6 in sequence.

[0049] It should be pointed out that Figure 4 and Figure 5 The provided embodiment is only used as a preferred reference, and the specific layout can be adjusted accordingly, for example, by adjusting the positions of the components on the first pipeline 7 and the second pipeline 8.

[0050] Combine Figure 2 As shown, the pump group module 1 includes a motor 11, a water pump 12, and an electric three-way valve 19. The motor 11 drives the water pump 12 to provide power for the coolant; the electric three-way valve 19 is used to control the switching between the external circulation mode and the internal circulation mode. The electric three-way valve 19 changes the passage state of the pipeline to which it is connected and changes the flow direction of the coolant inside the pipeline, thereby achieving the effect of mode switching.

[0051] Combine Figure 3 As shown, the interface of the electric three-way valve 19 is connected using a quick-release clamp 191. Before installation, check that the threads of the clamp locking bolt are clean and free of foreign matter, and then apply anti-seize agent to the threads. Place the clamp sealing ring in the middle of the quick-release clamp 191 interface. Align the clamp interfaces at both ends and tighten them. Then install the two clamp halves and insert the clamp locking bolts into the clamp holes, ensuring that the bolt heads are on the side with the step. Then install the spring washers and nuts, initially tighten the nuts manually, and finally tighten them using a torque wrench.

[0052] Combine Figure 2 and Figure 3 As shown, when the coolant temperature is higher than the set value T1, the electric three-way valve 19 opens, that is, the pointer points to OPEN. In the OPEN state: all the coolant flows through the radiator outside the tower, and the flow path of the coolant is a→b→d.

[0053] When the coolant temperature is lower than the set value T1-N (N value is generally around 3-5), the electric three-way valve 19 is closed, that is, the pointer points to SHUT. In the SHUT state: the coolant flows directly to the cooled equipment and does not flow through the radiator outside the tower. The flow path of the coolant is c→d.

[0054] Specifically, the external air-water radiator 2 and the built-in environmental control radiator 3 in the present invention both adopt forced air cooling; the external cold air passes through the external air-water radiator 2, the cold air absorbs heat, and then dissipates the heat to the outside; the internal air passes through the built-in environmental control radiator 3, and the heat is transferred to the interior of the offshore wind turbine tower.

[0055] The pump module 1 includes an expansion tank 13 for stabilizing the pressure of the coolant. The expansion tank 13 is located in the pipeline where the coolant flows. The expansion tank 13 ensures that the system water pressure changes due to leakage, temperature influence, etc. in the system, which affects the water cooling circuit circulation.

[0056] The pump module 1 includes an automatic exhaust valve 15 for automatically removing gas from the system coolant. The automatic exhaust valve 15 is set at the high point of the pipeline. Multiple automatic exhaust valves 15 can be set to automatically remove gas from the system cooling water.

[0057] The pump module 1 includes a pressure transmitter 14 for monitoring changes in the pressure value inside the pipeline and displaying the pressure value through a pressure gauge 17 .

[0058] The pump module 1 includes a heater 16, which is used to heat the coolant in the pipeline to prevent the coolant from flowing obstructed when the ambient temperature is too low.

[0059] The pump module 1 includes a flow meter 18, which is used to monitor the flow of the coolant in the circuit.

[0060] A temperature sensor is also provided on the pipeline to monitor temperature changes in the pipeline.

[0061] The expansion tank 13, automatic exhaust valve 15, pressure transmitter 14, heater 16, flow meter 18, and temperature sensor may be provided individually or in combination.

[0062] The built-in environmental control radiator 3 includes two types: one with an enclosure and one without an enclosure: the built-in environmental control radiator 3 with an enclosure is used to absorb the hot air in the current and next layers of the tower, and after cooling it with cold water, blow the air to the upper layer with the help of a flexible air guide; the built-in environmental control radiator 3 without an enclosure is used to absorb the hot air in the next layer of the tower, and after cooling it with cold water, blow the air to the current layer.

[0063] The function of the built-in environmentally controlled radiator (without enclosure) is to absorb the "hot air" in the current layer and the next layer of the tower, cool it down with "cold water", and then blow it to the upper layer with the help of a flexible air guide, so as to achieve the purpose of air flow in the tower and reduce the temperature inside the tower.

[0064] The function of the built-in environmental control radiator (with enclosure) is to absorb the "hot air" in the next layer of space in the tower, cool it down with "cold water" and blow it to the current space, so as to achieve the purpose of air flow in the tower and reduce the temperature in the tower.

[0065] The enclosure is used to shield the air in this layer and to drain the air to the next layer.

[0066] The present invention provides a water cooling control method, applicable to the above-mentioned integrated water cooling system under the offshore wind turbine tower. The water cooling control method includes an external circulation mode and an internal circulation mode. In the external circulation mode, the first pipeline 7 and the second pipeline 8 form a parallel pipeline, and the pump module 1 drives the coolant to circulate through the parallel pipeline and the external air-water radiator 2. In the internal circulation mode, the first pipeline 7 and the second pipeline 8 are connected in series to form a circulation pipeline, and the pump module 1 drives the coolant to circulate in the circulation pipeline.

[0067] The switching conditions between external circulation mode and internal circulation mode are:

[0068] The system switches to external circulation mode when the following conditions are met simultaneously: A. Electric three-way valve 19 open command = 1; B. Electric three-way valve 19 close command = 0; C. Motor 11 starts, or the outlet water temperature of external air-water radiator 2 exceeds the set value. A command of 1 indicates a corresponding command has been issued, while a command of 0 indicates no corresponding command has been issued.

[0069] When the following conditions are met at the same time, switch to the internal circulation mode: A. Electric three-way valve 19 opening instruction = 0; B. Electric three-way valve 19 closing instruction = 1; C. Motor 11 is turned off, or the outlet water temperature of the external air-water radiator 2 is lower than the set value.

[0070] The starting logic of motor 11 is:

[0071] When neither "pressure detected by pressure transmitter 14 is too low" nor "pressure detected by pressure transmitter 14 is too high" exists, any of the following conditions is met: A. The unit is connected to the grid; B. The outlet temperature of the radiator outside the water cooling system is too high or the component to be cooled issues a cooling request; C. The step-up transformer temperature is higher than the set temperature value; D. Any of the transformer cooling fans is started;

[0072] The stop logic of motor 11 is:

[0073] When the "pressure detected by the pressure transmitter 14 is too low or too high" is triggered, the motor 11 and the water pump 12 are turned off, and any of the following conditions are met at the same time: A. The unit is shut down; B. The outlet temperature of the radiator outside the water cooling system is lower than a set value and no cooling request is received from the component to be cooled; C. The temperature of the step-up transformer is lower than the stop temperature of the step-up transformer oil pump; D. Any of the transformer cooling fans is stopped.

[0074] The working parameters of the integrated water cooling system under the offshore wind turbine tower introduced in the present invention are set as follows: the temperature inside the tower is -20℃~40℃, the ambient temperature outside the tower is -30℃~38℃; the total cooling power is: 250kw, the working flow of the water cooling system is: 220L / min, the maximum water inlet temperature of the converter heat exchanger 4 is: 40℃, the maximum water inlet temperature of the rotor boost converter heat exchanger 5 is: 50℃, the maximum water inlet temperature of the built-in environmental control radiator 3 is: 40℃, the maximum water inlet temperature of the unit boost converter heat exchanger 6 is: 55℃, and the maximum air inlet temperature of the external air-water radiator 2 is: 35℃; the design pressure of the whole machine is: 15bar, the rated water outlet pressure is: ≤5bar, the pressure drop of the external air-water radiator 2, the built-in environmental control radiator 3, and the converter heat exchanger 4 is ≤2bar; the coolant is a mixture of pure water and ethylene glycol in equal proportions.

[0075] The status settings on the main control side mainly include: inlet / outlet water pressure of the water cooling pump under the tower, boost variable flow rate FT01 / FT02 of the water cooling system under the tower, water temperature of the water cooling main circuit under the tower, boost variable 1 / 2 inlet temperature / outlet temperature of the water cooling system under the tower, open / close instruction of the electric three-way valve under the tower, open / close feedback of the electric three-way valve under the tower, overload / start feedback of the motor of the water cooling radiator under the tower, operation feedback of the fan of the water cooling radiator under the tower, operation / overload / start feedback of the motor of the water cooling main circulation pump under the tower, normal water cooling heater under the tower, operation instruction / feedback of the water cooling heater under the tower, overload / operation feedback of the built-in water cooling fan under the tower, start instruction of the built-in water cooling fan under the tower, etc.

[0076] The master control side can provide remote status signal warnings, including low circuit pressure, low pump inlet and outlet pressures, excessively high inlet temperature of the equipment to be cooled, excessive tower temperature, and abnormal sensor readings. These warning signals ensure that the control side can detect water cooling system operational faults as early as possible, avoiding fan shutdown or failure.

[0077] The design of the system operation control process is summarized as follows. First, the water pump operates according to the designed pressure and flow rate. The cooling medium circulates directly from the main circuit through the converter, transformer, and tower environmental control and heat dissipation module to remove heat. The external radiator exchanges heat with the cold air. After dissipation, the cooling medium is recirculated into the converter, transformer, and tower environmental control and heat dissipation module. The return oil pipeline is equipped with an expansion tank and pre-charged with a pressure of 1.5 bar to ensure normal water replenishment and absorption of high-temperature expansion requirements within the system. The pressure sensor monitors the pressure value changes inside the water cooling system pipeline and prompts an alarm. A temperature sensor (platinum resistance thermometer) is installed at the inlet to monitor temperature changes inside the water cooling system pipeline or to prompt an alarm.

[0078] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An integrated water cooling system under an offshore wind turbine tower, characterized in that: It includes a pump module (1), an external air-water radiator (2), a built-in environmental control radiator (3), a variable flow heat exchanger (4), a rotor boost heat exchanger (5), and a unit boost heat exchanger (6), wherein: Two of the four of the built-in environmental control radiator (3), the variable flow heat exchanger (4), the rotor boost heat exchanger (5), and the unit boost heat exchanger (6) are connected in series to the first pipeline (7), and the other two are connected in series to the second pipeline (8); The first pipeline (7) and the second pipeline (8) are connected in parallel to a circulation pipeline formed by the pump module (1) and the external air-water radiator (2); The integrated water cooling system under the offshore wind turbine tower can switch between two different cooling modes: External circulation mode: the first pipeline (7) and the second pipeline (8) form a parallel pipeline, and the pump module (1) drives the coolant to circulate through the parallel pipeline and the external air-water radiator (2); Internal circulation mode: the first pipeline (7) and the second pipeline (8) are connected in series to form a circulation pipeline, and the pump group module (1) drives the coolant to circulate in the circulation pipeline; The pump module (1) comprises a motor (11), a water pump (12), and an electric three-way valve (19); the motor (11) drives the water pump (12) to work to provide power for the coolant; the electric three-way valve (19) is used to control switching between the external circulation mode and the internal circulation mode; The external air-water radiator (2) and the internal environmental control radiator (3) both adopt forced air cooling.

2. The integrated water cooling system under the offshore wind turbine tower according to claim 1 is characterized in that: The variable heat exchanger (4) and the rotor boost heat exchanger (5) are arranged in the first pipeline (7); the built-in environmental control radiator (3) and the unit boost heat exchanger (6) are arranged in the second pipeline (8).

3. The integrated water cooling system under the offshore wind turbine tower according to claim 1 is characterized in that: The interface of the electric three-way valve (19) is connected by a quick-release clamp (191).

4. The integrated water cooling system under the offshore wind turbine tower according to claim 1, characterized in that: The pump module (1) comprises an expansion tank (13) for stabilizing the pressure of the coolant; And / or, the pump module (1) includes an automatic exhaust valve (15) for automatically exhausting gas from the system coolant; And / or, the pump module (1) includes a pressure transmitter (14) for monitoring changes in the pressure value inside the pipeline and displaying the pressure value through a pressure gauge (17); And / or, the pump module (1) includes a heater (16) for heating the coolant in the pipeline; And / or, the pump module (1) includes a flow meter (18) for monitoring the flow of the coolant in the circuit; And / or, a temperature sensor is also included to monitor temperature changes in the pipeline.

5. The integrated water cooling system under the offshore wind turbine tower according to claim 1, characterized in that: The built-in environmental control radiator (3) is provided with a fence or is not provided with a fence; The built-in environmental control radiator (3) provided with the enclosure is used to absorb the hot air in the tower layer and the next layer, cool it down with cold water, and then blow the air to the upper layer with the help of a flexible air guide tube; The built-in environmental control radiator (3) without enclosure is used to absorb hot air from the next layer of space in the tower, cool it with cold water, and then blow the air to the current layer of space.

6. A water cooling control method, applied to the integrated water cooling system under the offshore wind turbine tower according to any one of claims 1 to 5, characterized in that: It includes an external circulation mode and an internal circulation mode. When in the external circulation mode, the first pipeline (7) and the second pipeline (8) form a parallel pipeline, and the pump group module (1) drives the coolant to flow through the parallel pipeline and circulate through the external air-water radiator (2); When in the internal circulation mode, the first pipeline (7) and the second pipeline (8) are connected in series to form a circulation pipeline, and the pump group module (1) drives the coolant to circulate in the circulation pipeline; When the following conditions are met at the same time, switch to external circulation mode: A. Electric three-way valve (19) opening instruction = 1; B. Electric three-way valve (19) closing instruction = 0; C. Motor (11) starts, or the outlet water temperature of the external air-water radiator (2) is greater than the set value; When the following conditions are met at the same time, switch to the internal circulation mode: A. Electric three-way valve (19) opening command = 0; B. Electric three-way valve (19) closing command = 1; C. Motor (11) is closed, or the outlet water temperature of the external air-water radiator (2) is lower than the set value.

7. The water cooling control method according to claim 6, characterized in that: The starting logic of the motor (11) is: When neither "pressure detected by pressure transmitter (14) is too low" nor "pressure detected by pressure transmitter (14) is too high" exists, any of the following conditions is met: A. The unit is connected to the grid; B. The outlet temperature of the radiator outside the water cooling system is too high or the component to be cooled issues a cooling request; C. The step-up transformer temperature is higher than the set temperature value; D. Any of the transformer cooling fans is started; The stopping logic of the motor (11) is: When the "pressure detected by the pressure transmitter (14) is too low or too high" is triggered, the motor (11) and the water pump (12) are turned off, and any of the following conditions are met at the same time: A. The unit is shut down; B. The outlet temperature of the radiator outside the water cooling system tower is lower than a certain set value and no cooling request is received from the component to be cooled; C. The temperature of the step-up transformer is lower than the stop temperature of the step-up transformer oil pump; D. Any of the transformer cooling fans is stopped.

Images