Wind generating set gearbox lubricating oil heat dissipation system based on compression refrigeration technology

Abstract

The invention discloses a wind generating set gearbox lubricating oil heat dissipation system based on a compression refrigeration technology, which comprises a lubricating oil loop, a lubricating oil pump and a lubricating oil pipeline, the cooling water loop comprises a first heat exchanger, a main radiator, a cooling water pump and a cooling water pipeline, and the cooling water pump drives cooling water to circulate in the cooling water pipeline; the compression refrigeration loop comprises a plate heat exchanger, a compressor, a condenser, an expansion valve and a refrigerant pipeline; the plate heat exchanger is provided with two fluid channels, one fluid channel is communicated with the cooling water pipeline, and the other fluid channel is communicated with the refrigerant pipeline; when a compressor of the compression refrigeration loop works, a refrigerant circulating in the plate heat exchanger absorbs heat of cooling water in the cooling water pipeline and evaporates, and therefore the temperature of the cooling water in the cooling water pipeline is reduced. By means of the lubricating oil heat dissipation system, the gearbox can have better safety performance under the high-temperature working condition, and the optimization and upgrading requirements of different old wind turbine generators are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gear box lubricating oil heat dissipation system, especially the wind turbine generator set gear box lubricating oil heat dissipation system based on compression refrigeration technology. BACKGROUND

[0002] Temperature management of lubricating oil is crucial for the stable operation of wind turbine gearboxes. High temperature can reduce the viscosity of oil, weaken the strength of the lubricating film, and increase friction and wear, which may cause equipment downtime and affect the efficiency and reliability of wind turbine generators. As the service life of wind turbine generators increases, the original lubricating oil heat dissipation system may not meet the heat dissipation requirements due to performance degradation, especially in high temperature seasons, the problem of high lubricating oil temperature is particularly prominent, which leads to frequent downtime and significant economic losses to wind power operation.

[0003] To ensure the continuous and efficient operation of wind turbine generators, it is particularly urgent to optimize and upgrade the heat dissipation system of old wind turbine generators. By improving the heat dissipation technology, the heat dissipation efficiency of the gearbox can be improved to prevent high oil temperature, reduce downtime accidents, prolong the service life of the equipment, and ensure the stable operation of the wind turbine generator.

[0004] Currently, there is no technical solution and related patent for optimizing and upgrading the heat dissipation system of existing old wind turbine generators. However, there are some related patents for wind turbine gearbox heat dissipation systems.

[0005] Chinese invention patent CN110925407B discloses a gear box lubricating system heat dissipation device, which mainly features that an oil tank is arranged in the gear box lubricating oil system, a heat pipe is inserted into the upper part of the oil tank, and a fan is arranged on the top end of the heat pipe. That is, the heat pipe takes advantage of its good heat conduction performance to bring the heat of the lubricating oil to the top heat dissipation fins, which is dissipated to the environment by the fan.

[0006] If the technical solution of the above existing technology one is used, an additional lubricating oil tank needs to be added to the existing system, and a large number of heat pipes need to be arranged on the top of the oil tank. The sealing surface of the heat pipe and the oil tank is challenging, and leakage of lubricating oil is likely to occur at this location. The heat dissipation capacity of the heat pipe is limited, and the heat dissipation capacity of the lubricating oil is usually 10kw or more. The carrying capacity of this scheme is limited, and it cannot achieve good heat dissipation effect in actual engineering application. The heat brought out by the heat pipe in this scheme is dissipated to the cabin environment of the wind turbine generator by the fan, which will cause the cabin temperature to rise continuously, which will seriously affect the operation of other equipment in the cabin, and the self-heat dissipation capacity will also gradually decrease. SUMMARY

[0007] The technical problem solved by the present application is to provide a wind turbine generator set gearbox lubricating oil heat dissipation system based on compression refrigeration technology, which can meet the heat dissipation requirements of the wind turbine generator set in an extremely high temperature environment and ensure that the oil temperature of the gearbox is stable within a safe range.

[0008] The technical solution adopted by the present application to solve the above technical problem is a wind turbine generator set gearbox lubricating oil heat dissipation system based on compression refrigeration technology, comprising

[0009] A lubricating oil circuit comprising a lubricating oil pump and a lubricating oil pipeline, the lubricating oil pump drives the circulation of lubricating oil in the lubricating oil pipeline,

[0010] A cooling water circuit comprising a first heat exchanger, a main heat sink, a cooling water pump, a cooling water pipeline, and the cooling water pump drives the circulation of cooling water in the cooling water pipeline;

[0011] A compression refrigeration circuit comprising a plate heat exchanger, a compressor, a condenser, an expansion valve, and a refrigerant pipeline; the plate heat exchanger has two fluid channels, one of which is connected to the cooling water pipeline, and the other of which is connected to the refrigerant pipeline;

[0012] The lubricating oil in the lubricating oil pipeline and the cooling water in the cooling water pipeline exchange heat at the first heat exchanger;

[0013] When the compressor of the compression refrigeration circuit is working, the refrigerant flowing through the plate heat exchanger absorbs the heat of the cooling water in the cooling water pipeline and evaporates, thereby reducing the temperature of the cooling water in the cooling water pipeline.

[0014] Preferably, the wind turbine generator set gearbox lubricating oil heat dissipation system based on compression refrigeration technology further comprises an ambient temperature sensor, and a cooling water temperature sensor arranged at the cooling water pipeline at the cooling water inlet of the plate heat exchanger;

[0015] When the ambient temperature detected by the ambient temperature sensor does not exceed the preset ambient temperature, the lubricating oil in the lubricating oil pipeline is cooled by the cooling water in the cooling water circuit, the cooling water exchanges heat with the lubricating oil through the first heat exchanger and absorbs the heat in the lubricating oil; the main heat sink transfers heat to the external environment by forced air cooling, thereby reducing the temperature of the cooling water;

[0016] When the ambient temperature rises and the ambient temperature detected by the ambient temperature sensor exceeds the preset ambient temperature, the controller receives the cooling water temperature at the cooling water inlet of the plate heat exchanger detected by the cooling water temperature sensor;

[0017] If the cooling water temperature sensor detects that the cooling water temperature at the cooling water inlet of the plate heat exchanger exceeds the preset cooling water threshold, the controller starts the compressor to work, and the refrigerant circulating in the plate heat exchanger of the compression refrigeration circuit absorbs the heat of the cooling water and evaporates, thereby further reducing the temperature of the cooling water.

[0018] Preferably, the wind turbine generator set gearbox lubricating oil heat dissipation system based on compression refrigeration technology further comprises a three-way electromagnetic valve, a first path interface of the three-way electromagnetic valve is connected to the cooling water pipeline from the main heat sink, a second path interface of the three-way electromagnetic valve is connected to the cooling water inlet of the cooling water pump, and a third path interface of the three-way electromagnetic valve is connected to the cooling water pipeline in communication with the cooling water inlet of the plate heat exchanger, and the three-way electromagnetic valve is controlled by the controller to be turned on and turned off.

[0019] A cooling water temperature sensor is arranged at the cooling water pipeline at the cooling water inlet of the plate heat exchanger, if the cooling water temperature sensor detects that the cooling water temperature at the cooling water inlet of the plate heat exchanger exceeds the preset cooling water threshold, the controller controls the first path interface and the third path interface of the three-way electromagnetic valve to be connected, and the controller starts the compressor to work, and the refrigerant circulating in the plate heat exchanger of the compression refrigeration circuit absorbs the heat of the cooling water and evaporates, thereby further reducing the temperature of the cooling water.

[0020] If the cooling water temperature sensor detects that the cooling water temperature at the cooling water inlet of the plate heat exchanger does not exceed the preset cooling water threshold, the controller controls the first path interface and the second path interface of the three-way electromagnetic valve to be connected, and the cooling water in the cooling water pipeline from the main heat sink directly flows to the cooling water pump.

[0021] Preferably, the first heat exchanger is a brazed heat exchanger, and the compressor is a variable frequency compressor.

[0022] The wind turbine generator set gearbox lubricating oil heat dissipation system based on compression refrigeration technology has the advantages that the compression refrigeration technology is introduced, and the safety performance of the gearbox is better when facing high-temperature working conditions.

[0023] The present application mainly optimizes and upgrades the heat dissipation system of the existing old wind turbine generator set, and the technology has the advantages of strong heat dissipation capacity, good compatibility with the existing system, controllable transformation cost, high safety and reliability, etc. The technology adopts the compression refrigeration technology, and a auxiliary heat dissipation device (compression refrigeration circuit) is connected in parallel to the existing equipment, which can provide 10-20kW of refrigeration capacity according to the needs, and meet the optimization and upgrading needs of different old wind turbine generator sets. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is the principle diagram of the wind turbine generator set gearbox lubricating oil heat dissipation system based on compression refrigeration technology of the present application;

[0025] Figure 2 is a schematic diagram of the flow of cooling water and refrigerant in the plate heat exchanger of the present application.

[0026] Wherein: 1, lubricating oil pump; 2, lubricating oil pipeline; 3, first heat exchanger; 4, main radiator; 5, cooling water pump; 6, cooling water pipeline; 7, plate heat exchanger; 8, compressor; 9, condenser; 10, expansion valve; 11, refrigerant pipeline; 12, controller; 13, three-way electromagnetic valve; 14, cooling water temperature sensor. DETAILED DESCRIPTION

[0027] The present application will now be further described in greater detail in connection with the preferred embodiments and the accompanying drawings. These drawings show only the essential features of the application and are not to be construed as being limiting as to the scope of the application.

[0028] As shown in the drawings, a lubricating oil heat dissipation system for a gear box of a wind turbine generator unit based on compression refrigeration technology comprises Figure 1

[0029] A lubricating oil circuit comprising a lubricating oil pump 1 and a lubricating oil pipeline 2, the lubricating oil pump 1 driving the circulation of lubricating oil in the lubricating oil pipeline 2,

[0030] A cooling water circuit comprising a first heat exchanger 3, a main radiator 4, a cooling water pump 5, and a cooling water pipeline 6, the cooling water pump 5 driving the circulation of cooling water in the cooling water pipeline 6;

[0031] A compression refrigeration circuit comprising a plate heat exchanger 7, a compressor 8, a condenser 9, an expansion valve 10, and a refrigerant pipeline 11; the plate heat exchanger 7 having two fluid passages, one of which is connected to the cooling water pipeline 6 and the other of which is connected to the refrigerant pipeline 11;

[0032] The lubricating oil in the lubricating oil pipeline 2 and the cooling water in the cooling water pipeline 6 exchange heat at the first heat exchanger 3;

[0033] When the compressor 8 of the compression refrigeration circuit is working, the refrigerant flowing through the plate heat exchanger 7 absorbs the heat of the cooling water in the cooling water pipeline 6 and evaporates, thereby reducing the temperature of the cooling water in the cooling water pipeline 6.

[0034] The lubricating oil heat dissipation system for the gear box of the wind turbine generator unit of the present application introduces compression refrigeration technology. Under this technology, the lubricating oil heat dissipation system for the gear box has better safety performance when facing high temperature working conditions.

[0035] ​The application mainly aims at optimizing and upgrading the heat dissipation system of the existing old wind turbine, and has the advantages of strong heat dissipation capacity, good compatibility with the existing system, controllable transformation cost, high safety and reliability, etc. The technology adopts compression refrigeration technology, and a parallel auxiliary heat dissipation device (compression refrigeration circuit) is connected to the existing equipment, which can provide 10-20 kW refrigeration capacity according to the needs, and meet the optimization and upgrading needs of the heat dissipation system of different old wind turbines.

[0036] Specifically, in an optional embodiment, the wind turbine gearbox lubricating oil heat dissipation system based on compression refrigeration technology is further provided with an ambient temperature sensor, and a cooling water temperature sensor 14 is arranged at the cooling water pipeline 6 at the cooling water inlet of the plate heat exchanger 7;

[0037] When the ambient temperature detected by the ambient temperature sensor does not exceed the preset ambient temperature value, the lubricating oil in the lubricating oil pipeline 2 is cooled by the cooling water in the cooling water circuit, and the cooling water exchanges heat with the lubricating oil through the first heat exchanger 3 to absorb the heat in the lubricating oil; the main radiator 4 transmits the heat to the external environment by forced air cooling, thereby reducing the temperature of the cooling water;

[0038] When the ambient temperature rises and the ambient temperature detected by the ambient temperature sensor exceeds the preset ambient temperature value, the controller 12 receives the cooling water temperature at the cooling water inlet of the plate heat exchanger 7 detected by the cooling water temperature sensor 14;

[0039] If the cooling water temperature at the cooling water inlet of the plate heat exchanger 7 detected by the cooling water temperature sensor 14 exceeds the preset cooling water threshold value, the controller 12 starts the compressor 8 to work, and the refrigerant circulating in the plate heat exchanger 7 of the compression refrigeration circuit absorbs the heat of the cooling water and evaporates, thereby further reducing the temperature of the cooling water.

[0040] Specifically, in an optional embodiment, the wind turbine gearbox lubricating oil heat dissipation system based on compression refrigeration technology further comprises a three-way electromagnetic valve 13, a first interface of the three-way electromagnetic valve 13 is connected to the cooling water pipeline 6 from the main radiator 4, a second interface of the three-way electromagnetic valve 13 is connected to the cooling water inlet of the cooling water pump 5, and a third interface of the three-way electromagnetic valve 13 is connected to the cooling water pipeline 6 in communication with the cooling water inlet of the plate heat exchanger 7, and the three-way electromagnetic valve 13 is controlled by the controller 12 to be turned on and turned off;

[0041] A cooling water temperature sensor 14 is arranged at the cooling water pipeline 6 at the cooling water inlet of the plate heat exchanger 7, if the cooling water temperature sensor 14 detects that the cooling water temperature at the cooling water inlet of the plate heat exchanger 7 exceeds a preset cooling water threshold value, the controller 12 controls the first port interface and the third port interface of the three-way electromagnetic valve 13 to be connected; the controller 12 starts the compressor 8 to work, and the refrigerant circulating in the plate heat exchanger 7 of the compression refrigeration circuit absorbs the heat of the cooling water and evaporates, so as to further reduce the temperature of the cooling water;

[0042] If the cooling water temperature sensor 14 detects that the cooling water temperature at the cooling water inlet of the plate heat exchanger 7 does not exceed the preset cooling water threshold value, the controller 12 controls the first port interface and the second port interface of the three-way electromagnetic valve 13 to be connected, and the cooling water in the cooling water pipeline 6 out of the main radiator 4 directly flows to the cooling water pump 5.

[0043] Specifically, in an optional embodiment, the first heat exchanger 3 adopts a brazed heat exchanger, and the compressor 8 is a variable frequency compressor 8. The plate heat exchanger 7 can adopt a flat plate heat exchanger or a spiral plate heat exchanger or a plate tube heat exchanger. For example, a plate tube heat exchanger includes a cylinder body with cover plates at two ends, an installation plate is arranged in the cavity of the cylinder body, a part of the refrigerant pipeline 11 circulating the refrigerant is inserted into the limiting grooves arranged on both sides of the installation plate, the refrigerant pipeline 11 is positioned by the installation plate, and the installation plate is fixedly installed with the inner wall of the cover plate or the cylinder body. The refrigerant pipeline 11 penetrates the cover plates at both ends of the cylinder body respectively, the cover plates at both ends of the cylinder body are respectively provided with a cooling water inlet and a cooling water outlet, and the cavity of the cylinder body serves as a cooling water circulation flow channel. In this plate tube heat exchanger, the outer wall of the refrigerant pipeline 11 directly contacts with the cooling water in the cavity of the cylinder body, so that the refrigeration efficiency is improved, and the installation plate arranged in the cavity can also increase the heat dissipation area, so that the heat exchange efficiency between the refrigerant and the cooling water is further improved.

[0044] The existing equipment water cooling heat dissipation mechanism is as follows:

[0045] 1. When the ambient temperature is low, the lubricating oil circuit of the gear box is mainly cooled by cooling water. The cooling water exchanges heat with the lubricating oil through the brazed heat exchanger and absorbs the heat in the lubricating oil.

[0046] 2. After absorbing heat, the temperature of the cooling water rises, and then flows to the main radiator 4. The main radiator 4 usually has a large surface area, and heat is transferred to the external environment by forced air cooling, so as to reduce the temperature of the cooling water.

[0047] 3. After releasing heat in the main radiator 4, the temperature of the cooling water is reduced, and the cooling water is circulated to the brazed heat exchanger again to continue absorbing the heat of the lubricating oil, forming a closed cooling water circuit.

[0048] The wind turbine generator set gear box lubricating oil heat dissipation system based on compression refrigeration technology of the application can realize compression refrigeration auxiliary heat dissipation in a high-temperature environment:

[0049] 1. When the ambient temperature rises, especially reaches above 40℃, only relying on water cooling heat dissipation may not meet the heat dissipation requirement of the gear box. At this time, the system detects the cooling water temperature of the cooling water inlet of the plate heat exchanger 7.

[0050] 2. If the water temperature exceeds the preset cooling water high temperature threshold, indicating that the water cooling heat dissipation capacity is insufficient, the system will start the compressor 8 in the compression refrigeration circuit. The compression refrigeration circuit compresses the low-pressure low-temperature refrigerant vapor into high-pressure hot vapor through the compressor 8.

[0051] 3. The high-pressure hot vapor then enters the air-cooled condenser 9, where it releases heat and condenses into high-pressure liquid.

[0052] 4. The liquid refrigerant is throttled by the expansion valve 10, the pressure and temperature are reduced, and enters the plate heat exchanger 7. In the plate heat exchanger 7, the low-pressure low-temperature refrigerant absorbs the heat of the cooling water and evaporates, thereby further reducing the temperature of the cooling water.

[0053] 5. The cooling water that has been further cooled is circulated to the brazed heat exchanger again, exchanges heat with the lubricating oil, effectively reduces the temperature of the lubricating oil, and prevents gear box failure caused by high temperature.

[0054] In order to improve energy efficiency and adapt to different heat dissipation requirements, the compressor 8 in the compression circuit adopts frequency conversion technology. The operating speed of the compressor 8 can be dynamically adjusted according to the actual heat dissipation requirement.

[0055] When it is detected that the cooling water temperature of the cooling water inlet of the plate heat exchanger 7 is lower than a certain set cooling water low temperature threshold, the system will automatically turn off the compression refrigeration circuit to avoid excessive refrigeration and energy waste.

[0056] The wind turbine generator set gear box lubricating oil heat dissipation system based on compression refrigeration technology of the application has good system compatibility and low modification requirement:

[0057] 1. The heat dissipation system is designed with full consideration of compatibility with the wind turbine generator set gear box, the overall modification workload is small, and the complexity and cost in the implementation process can be reduced. The system can be easily integrated into the existing heat dissipation architecture without the need for large-scale modification of the gear box or its supporting structure, reducing the risk and difficulty of technical upgrading.

[0058] 2. Efficient refrigeration performance and scalability:

[0059] The heat dissipation system provides large refrigeration capacity and superior refrigeration efficiency, meeting the heat dissipation needs of wind turbines in extreme high-temperature environments and ensuring that the gearbox oil temperature is stable within a safe range.

[0060] The refrigeration capacity can be customized according to the heat dissipation needs of specific wind turbines, ranging from 10 kW and above, to adapt to wind turbines of different power and size.

[0061] 3. Strong environmental adaptability:

[0062] The compression refrigeration technology can adapt to changing working environments, maintaining stable refrigeration effects in high-temperature, high-humidity, or extreme low-temperature conditions.

[0063] This adaptability means that wind turbines can operate in a wider range of geographical locations and climate conditions, improving the application range and reliability of this technology solution in wind turbines.

[0064] The above description is only a specific embodiment of the present application, and various examples do not limit the essential content of the present application. Those skilled in the art can modify or deform the above-described specific embodiments without departing from the spirit and scope of the present application.

Claims

1. A wind turbine generator set gearbox lubricating oil heat dissipation system based on compression refrigeration technology, characterized in that: Comprising a lubricating oil circuit comprising a lubricating oil pump, a lubricating oil pipeline, the lubricating oil pump driving the lubricating oil to circulate in the lubricating oil pipeline, a cooling water circuit comprising a first heat exchanger, a main radiator, a cooling water pump, a cooling water pipeline, the cooling water pump driving the cooling water to circulate in the cooling water pipeline; a compression refrigeration circuit comprising a plate heat exchanger, a compressor, a condenser, an expansion valve, a refrigerant pipeline; the plate heat exchanger has two fluid passages, one of which is connected with the cooling water pipeline, and the other of which is connected with the refrigerant pipeline; the lubricating oil in the lubricating oil pipeline and the cooling water in the cooling water pipeline exchange heat at the first heat exchanger; when the compressor of the compression refrigeration circuit is working, the refrigerant flowing through the plate heat exchanger absorbs the heat of the cooling water in the cooling water pipeline and evaporates, thereby reducing the temperature of the cooling water in the cooling water pipeline.

2. A compression refrigeration technology based heat sink system for lubricating oil of a wind turbine gearbox as claimed in claim 1, wherein: an ambient temperature sensor is arranged, and a cooling water temperature sensor is arranged at the cooling water pipeline at the cooling water inlet of the plate heat exchanger; when the ambient temperature detected by the ambient temperature sensor does not exceed the preset ambient temperature, the lubricating oil in the lubricating oil pipeline is cooled by the cooling water in the cooling water circuit, the cooling water exchanges heat with the lubricating oil through the first heat exchanger and absorbs the heat in the lubricating oil, and the main radiator transmits the heat to the external environment by forced air cooling, thereby reducing the temperature of the cooling water; when the ambient temperature rises and the ambient temperature detected by the ambient temperature sensor exceeds the preset ambient temperature, the controller receives the cooling water temperature at the cooling water inlet of the plate heat exchanger detected by the cooling water temperature sensor; if the cooling water temperature at the cooling water inlet of the plate heat exchanger detected by the cooling water temperature sensor exceeds the preset cooling water threshold, the controller starts the compressor to work, the refrigerant flowing through the plate heat exchanger of the compression refrigeration circuit absorbs the heat of the cooling water and evaporates, thereby further reducing the temperature of the cooling water.

3. The compression refrigeration technology based heat sink system for lubricating oil of a wind turbine gear box as claimed in claim 1 wherein: a three-way electromagnetic valve is further arranged, the first interface of the three-way electromagnetic valve is connected with the cooling water pipeline out of the main radiator, the second interface of the three-way electromagnetic valve is connected with the cooling water inlet of the cooling water pump, and the third interface of the three-way electromagnetic valve is connected with the cooling water pipeline connected with the cooling water inlet of the plate heat exchanger, and the three-way electromagnetic valve is controlled by the controller to be turned on and turned off; the cooling water temperature sensor is arranged at the cooling water pipeline at the cooling water inlet of the plate heat exchanger, if the cooling water temperature at the cooling water inlet of the plate heat exchanger detected by the cooling water temperature sensor exceeds the preset cooling water threshold, the controller controls the first interface and the third interface of the three-way electromagnetic valve to be connected, the controller starts the compressor to work, the refrigerant flowing through the plate heat exchanger of the compression refrigeration circuit absorbs the heat of the cooling water and evaporates, thereby further reducing the temperature of the cooling water; if the cooling water temperature at the cooling water inlet of the plate heat exchanger detected by the cooling water temperature sensor does not exceed the preset cooling water threshold, the controller controls the first interface and the second interface of the three-way electromagnetic valve to be connected, and the cooling water in the cooling water pipeline out of the main radiator directly flows to the cooling water pump.

4. The compression refrigeration technology based heat sink system for lubricating oil of a wind turbine gear box as claimed in claim 1 wherein: The first heat exchanger is a brazed heat exchanger, and the compressor is a variable frequency compressor.

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