Air-cooled heat exchange assembly

Abstract

The application discloses a wind-cooled heat exchange assembly for supplying oil for a gear box lubricating system of a wind turbine generator set in a low-temperature environment. The wind-cooled heat exchange assembly comprises a core body, a dust screen for filtering dust and impurities in air and a mounting plate for mounting and fixing with the wind turbine generator set, and the core body further comprises an oil inlet pipeline, an oil outlet pipeline, a plurality of inner pipelines for connecting the oil inlet pipeline and the oil outlet pipeline and a bypass pipeline, the oil inlet pipeline is provided with a heater which is inserted into the oil inlet pipeline to heat oil, and the bypass pipeline is arranged between the oil inlet pipeline and the oil outlet pipeline, and the oil in the oil inlet pipeline can also reach an oil outlet of the oil outlet pipeline through the bypass pipeline. The wind-cooled heat exchange assembly can quickly start the wind turbine generator set in the low-temperature environment, reduces the influence of the low-temperature working condition on the service life of the motor, and is not limited by the use site.

Description

Technical Field

[0001] This invention belongs to the field of wind power generation technology, specifically relating to an air-cooled heat exchange component that supplies oil to the gearbox lubrication system of a wind turbine generator in a low-temperature environment. Background Technology

[0002] Air-cooled heat exchangers are devices that transfer some of the heat from a hot fluid (such as oil or water) to air, which serves as the cooling medium. They are widely used in industries such as construction machinery, power, refrigeration, and new energy. In the gearbox lubrication system of wind turbine generators, the high-speed operation of the rotating mechanism generates a large amount of heat, causing the entire gearbox to overheat and affecting the safety and reliability of the wind turbine generator. Currently, air-cooled heat exchangers are typically used to cool the oil before supplying it to the gearbox lubrication system of wind turbine generators. Common air-cooled heat exchangers include natural air-cooled heat exchangers and forced air-cooled heat exchangers. Natural air-cooled heat exchangers directly use natural wind for heat exchange, while forced air-cooled heat exchangers use a motor-driven axial fan to generate forced airflow for heat exchange.

[0003] The Northeast, Northwest, and Inner Mongolia regions, which have the richest wind resources in China, are all high-altitude and cold areas, with minimum temperatures reaching -40℃ and low temperatures lasting for 4 to 6 months. The international standard IEC 61400-1 for wind turbine design stipulates that the normal ambient temperature for wind turbine design is -10℃ to 40℃, and the extreme ambient temperature is -20℃ to 50℃. Based on my country's actual conditions and current technology, the operating ambient temperature (or the ambient temperature required for normal operation) for low-temperature wind turbines is -30℃ to 45℃, and the survival ambient temperature range (or the ambient temperature required for normal preservation) is -40℃ to 50℃.

[0004] The gearbox lubrication system of a wind turbine generator typically requires a long-term, stable supply of lubricating oil to the gearbox in environments with significant temperature differences. Wind turbine generators operate in multiple states, including running, shut down, and grid failure (no power). Under low-temperature conditions, when a wind turbine generator first starts operating, or after a period of shutdown, the oil stored in the lubrication system thickens or freezes in the low-temperature environment. This leads to excessive oil viscosity, increased system resistance, and even oil pipe blockage, making it difficult to start the wind turbine generator, prone to high-temperature failures in winter, and forcing a start can also shorten the generator's lifespan. Summary of the Invention

[0005] To address the problems of difficult start-up and easy failure of wind turbine generator sets in low-temperature environments, this invention provides an air-cooled heat exchange component for supplying oil to the gearbox lubrication system of wind turbine generator sets in low-temperature environments.

[0006] The air-cooled heat exchange component provided by this invention includes a core.

[0007] The core includes an oil inlet pipe, an oil outlet pipe, and several internal pipes;

[0008] The oil inlet pipe is provided with an oil inlet, and the oil enters the oil inlet pipe from the oil inlet; the oil inlet pipe is also provided with a heater, which is inserted into the oil inlet pipe to heat the oil, and the heater is located below the oil inlet.

[0009] The plurality of internal pipes are arranged between the oil inlet pipe and the oil outlet pipe, and each internal pipe connects the oil inlet pipe and the oil outlet pipe. The oil in the oil inlet pipe flows into the oil outlet pipe through the plurality of internal pipes. The plurality of internal pipes exchange heat with the air to cool the oil flowing through them.

[0010] The oil outlet pipe is equipped with an oil outlet, from which oil is discharged from the oil outlet pipe.

[0011] Optionally, the heater has a temperature monitoring meter and a temperature control switch. The temperature monitoring meter is used to monitor the oil temperature in the oil inlet pipe and transmit the generated oil temperature signal to the heater. The heater controls the opening and closing of the temperature control switch according to the received temperature signal.

[0012] When the oil temperature in the oil inlet pipe is lower than the preset lower limit, the heater will turn on the temperature control switch to heat the oil.

[0013] When the oil temperature in the oil inlet pipe is higher than the preset upper temperature limit, the heater will turn off the temperature control switch to stop heating the oil;

[0014] Within the temperature range formed by the preset lower temperature limit and the preset upper temperature limit, the oil can flow freely.

[0015] Optionally, the core also includes a bypass pipe; one end of the bypass pipe is connected to the oil inlet pipe, and the other end is connected to the oil outlet pipe and located above the oil outlet.

[0016] The oil in the inlet pipe can also reach the outlet of the outlet pipe through the bypass pipe.

[0017] Optionally, the core also includes a bypass valve; the bypass valve is located at the connection between the oil inlet pipe and the bypass pipe, and is used to control the connection or disconnection of the oil inlet pipe and the bypass pipe.

[0018] Optionally, the bypass valve is a pressure-sensing valve;

[0019] When the oil pressure in the oil inlet pipe reaches the set threshold, the bypass valve opens, and the oil inlet pipe connects to the bypass pipe.

[0020] When the oil pressure in the oil inlet pipe is lower than the set threshold, the bypass valve closes, and the oil inlet pipe is disconnected from the bypass pipe.

[0021] Optionally, the air-cooled heat exchange component further includes a dust filter, which is disposed on the air intake side of the core and is used to filter dust and impurities in the air.

[0022] Optionally, the air-cooled heat exchange component further includes a mounting plate for mounting and fixing the air-cooled heat exchange component onto the wind turbine generator set;

[0023] The mounting plates are distributed on both sides of the core, and the mounting plates are provided with mounting holes.

[0024] Optionally, the core further includes a connecting plate, and the core is connected and fixed to the mounting plate through the connecting plate;

[0025] The connecting plates are distributed on both sides of the core, and the connecting plates are provided with mounting holes;

[0026] On either side of the core, the connecting plate is connected and fixed to the corresponding mounting plate through mounting holes.

[0027] Optionally, the core also includes a lifting plate, through which the air-cooled heat exchange component can be lifted for installation;

[0028] The hoisting plate is installed on the oil inlet pipe;

[0029] The core also includes a spare hole and a plug that matches the spare hole; the spare hole is located on the oil outlet pipe and is used to discharge oil from the core; the plug is used to seal the spare hole.

[0030] Optionally, the air-cooled heat exchange component can be installed outdoors, exchanging heat with the core through natural wind; or,

[0031] The air-cooled heat exchange component also includes a motor, an axial fan, and an air guide shroud. The axial fan and air guide shroud are located on the air intake side of the core. The forced air generated by the motor-driven axial fan is delivered to the core through the air guide shroud.

[0032] The air-cooled heat exchange component can be installed indoors, and heat exchange is performed between the component and the core through forced air.

[0033] Compared with existing technologies, the air-cooled heat exchange component provided by this invention for supplying oil to the gearbox lubrication system of wind turbine generators in low-temperature environments has a built-in heater in the oil inlet pipe. Under low-temperature conditions, the heater heats the oil, allowing it to heat up rapidly and promoting its flow in the inlet, inner, and outlet pipes, thereby reducing system resistance and achieving oil supply. This invention also includes a bypass pipe and a bypass valve. When system resistance is too high, a certain heating time is required for the oil to flow in the inner and outlet pipes. During this process, the pressure in the inlet pipe increases, opening the bypass valve. The oil then flows through the bypass pipe to the outlet of the outlet pipe, further reducing system resistance and achieving oil supply. The air-cooled heat exchange component provided by this invention enables rapid startup of wind turbine generators in low-temperature environments, reducing the impact of low-temperature conditions on motor lifespan. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the air-cooled heat exchange component described in Embodiment 1 of the present invention;

[0035] Figure 2 This is a disassembly diagram of the air-cooled heat exchange component described in Embodiment 1 of the present invention;

[0036] Figure 3 This is a schematic diagram of the core described in Embodiment 1 of the present invention;

[0037] Figure 4 This is a partially enlarged schematic diagram of the core at the oil inlet in Embodiment 1 of the present invention;

[0038] Figure 5 This is a schematic diagram of the air-cooled heat exchange component described in Embodiment 2 of the present invention;

[0039] Figure 6 This is a cross-sectional view of the air-cooled heat exchange component described in Embodiment 2 of the present invention. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that, in this document, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Unless otherwise specified, an element defined by the phrase "comprising..." or "including..." does not exclude the presence of additional elements in the process, method, article, or terminal device that includes said element.

[0042] It should be noted that the accompanying drawings are all in a very simplified form and use non-precise ratios, and are only used to facilitate and clearly illustrate the purpose of one embodiment of the present invention.

[0043] Example 1

[0044] The air-cooled heat exchange component provided by this invention is used to provide lubricating oil to the gearbox lubrication system of a wind turbine generator in a low-temperature environment. Figure 1 This is a schematic diagram of the air-cooled heat exchange component described in Embodiment 1 of the present invention; Figure 2 This is a disassembly diagram of the air-cooled heat exchange component described in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the core described in Embodiment 1 of the present invention; Figure 4 This is a partially enlarged schematic diagram of the core at the oil inlet in Embodiment 1 of the present invention. Figure 1-4 As shown, the air-cooled heat exchanger assembly structure provided in this embodiment includes a core 100, a dustproof mesh 200, and a mounting plate 300.

[0045] In this embodiment, air passes through the core 100 and exchanges heat with it, carrying away heat from the oil pipes and thus lowering the oil temperature, providing cooler lubricating oil to the gearbox lubrication system of the wind turbine generator. The dust filter 200 is located on the air inlet side of the core 100 to filter out dust and impurities from the air, preventing contamination of the core. Mounting plates 300 are respectively provided on both sides of the core 100, and mounting holes are provided on the mounting plates 300. The air-cooled heat exchange assembly is installed onto the wind turbine generator to provide lubricating oil to the gearbox lubrication system through the mounting plates 300.

[0046] The core 100 further includes an oil inlet pipe 110, an oil outlet pipe 120, and several inner pipes 130. The oil inlet pipe 110 has an oil inlet port 111 through which oil enters the oil inlet pipe 110. Several inner pipes 130 are disposed between the oil inlet pipe 110 and the oil outlet pipe 120, each inner pipe 130 connecting the oil inlet pipe 110 and the oil outlet pipe 120. The oil in the oil inlet pipe 110 flows into the oil outlet pipe 120 through the multiple inner pipes 130. As the oil flows through the multiple inner pipes 130, each inner pipe 130 exchanges heat with the air, thereby cooling the oil inside. The oil outlet pipe 120 has an oil outlet port 121 through which the oil flowing into the oil outlet pipe 120 flows out and enters the gearbox lubrication system.

[0047] The oil outlet pipe 120 is also provided with a spare hole 122. During the maintenance of the air-cooled heat exchange component or other necessary processes, the oil in the air-cooled heat exchange component can be discharged through the spare hole 122. A matching plug 123 is provided at the spare hole 122 for sealing the spare hole 122.

[0048] In this embodiment, the core 100 further includes a heater 140; the heater 140 is disposed in the oil inlet pipe 110 and is used to heat the oil in the oil inlet pipe to prevent the oil in the oil inlet pipe from increasing in viscosity or even solidifying and freezing in a low-temperature environment. The heating part of the heater 140 is inserted into the oil inlet pipe 110 and is located below the oil inlet 111, heating the oil at the oil inlet 111. The heater 140 has a temperature monitoring meter and a temperature control switch (not shown in the figure); the temperature monitoring meter is used to monitor the temperature of the oil in the oil inlet pipe 110 and transmits the generated oil temperature signal to the heater 140, and the heater 140 controls the opening and closing of the temperature control switch according to the received oil temperature signal. When the oil temperature in the inlet pipe is lower than the preset lower limit (e.g., 0°C), the heater 140 will turn on the temperature control switch to heat the oil in the inlet pipe 110; when the oil temperature in the inlet pipe is higher than the preset upper limit (e.g., 20°C), the heater 140 will turn off the temperature control switch to stop heating the oil in the inlet pipe 110. Within the temperature range formed by the preset lower and upper limits, the oil can flow freely; the preset lower limit (or upper limit) may differ for different viscosities of lubricating oil and under different ambient temperatures.

[0049] In this embodiment, the core 100 further includes a bypass pipe 150 and a bypass valve 160. The bypass pipe 150 is disposed between the oil inlet pipe 110 and the oil outlet pipe 120. When the oil in the plurality of inner pipes 130 and / or the oil outlet pipe 120 increases in viscosity or freezes in a low-temperature environment, causing excessive oil viscosity, increased system resistance, or even blockage of the oil pipe, the oil in the oil inlet pipe 110 can reach the oil outlet 121 of the oil outlet pipe through the bypass pipe 150.

[0050] One end of the bypass pipe 150 is connected to the inlet pipe 110; the bypass valve 160 is disposed at the connection between the bypass pipe 150 and the inlet pipe 110, and is used to control the connection or disconnection between the bypass pipe 150 and the inlet pipe 110. The bypass valve 160 is a pressure sensing valve. A threshold value is set for the bypass valve 160. When the oil passages of the plurality of inner pipes 130 and / or the outlet pipe 120 are blocked, causing the pressure in the inlet pipe 110 to increase and reach the set threshold value of the bypass valve 160, the bypass valve 160 opens, thereby connecting the inlet pipe 110 and the bypass pipe 150; when the oil passages of the plurality of inner pipes 130 and the outlet pipe 120 are connected, and the pressure in the inlet pipe 110 decreases and is lower than the set threshold value of the bypass valve 160, the bypass valve 160 closes, thereby disconnecting the inlet pipe 110 and the bypass pipe 150.

[0051] The other end of the bypass pipe 150 is connected to the oil outlet pipe 120 and is located above the oil outlet 121. In one embodiment of the present invention, the bypass pipe 150 is positioned directly above the oil outlet 121, so that even if the oil outlet pipe at the oil outlet 121 is blocked, the oil passage can be cleared in the shortest possible time by the action of oil temperature, allowing the oil in the bypass pipe 150 to flow out through the oil outlet 121 and enter the gearbox lubrication system, thereby improving the starting speed of the wind turbine generator set.

[0052] In this embodiment, the core 100 further includes a connecting plate 170, through which the core 100 is connected and fixed to the mounting plate 300. The connecting plates 170 are distributed on both sides of the core, and each connecting plate 170 is provided with a mounting hole; on any side of the core 100, the connecting plate is connected and fixed to the corresponding mounting plate through the mounting hole. It should be noted that the connecting plate 170 and the mounting plate 300 can be integrally formed components or two independent components; the air-cooled heat exchange assembly of the present invention is installed on the wind turbine generator set through the connecting plate 170 and the mounting plate 300, or it can be connected to the wind turbine generator set in other ways, and the present invention does not limit this.

[0053] In this embodiment, the core 100 may further include a lifting plate 180, which facilitates the lifting and installation of the air-cooled heat exchange component during the assembly of the air-cooled heat exchange component onto the wind turbine generator set. In this embodiment, the lifting plate 180 is disposed on the oil inlet pipe.

[0054] The air-cooled heat exchange component provided in this embodiment can be used directly in an outdoor environment. Outdoor natural wind enters the core from the air inlet surface and exchanges heat with each internal pipe 130.

[0055] Example 2

[0056] Figure 5 This is a schematic diagram of the air-cooled heat exchange component described in Embodiment 2 of the present invention; Figure 6 This is a cross-sectional view of the air-cooled heat exchange assembly described in Embodiment 2 of the present invention. The difference between this embodiment and the air-cooled heat exchange assembly provided in Embodiment 1 is that the air-cooled heat exchange assembly provided in this embodiment further includes a motor 400, an axial fan 500, and an air guide shroud 600, as shown below. Figure 5 , 6 As shown.

[0057] An axial fan 500 and an air guide 600 are provided on the air intake side of the core. Specifically, the air guide 600 is mounted on the connecting plate 170, and the motor 400 and the axial fan 500 are fixedly mounted on the air guide 600. The motor 400 drives the forced air generated by the axial fan 500 to pass through the air intake side of the core and enter the core, where it exchanges heat with each of the inner pipes 130. The air guide 600 is used to guide the forced air generated by the axial fan 500 to the air intake side of the core. At the same time, the air guide 600 also has the function of blocking dust and impurities.

[0058] The air-cooled heat exchange component provided in this embodiment is suitable for use in indoor environments. The forced air generated indoors enters the core from the air inlet surface and exchanges heat with each inner pipe 130.

[0059] This invention provides an air-cooled heat exchange component for supplying oil to the gearbox lubrication system of a wind turbine generator in low-temperature environments. A heater is built into the oil inlet pipe. Under low-temperature conditions, the heater heats the oil, allowing it to heat up quickly and promoting its flow in the inlet, inner, and outlet pipes, thereby reducing system resistance and achieving oil supply. The invention also includes a bypass pipe and a bypass valve. When system resistance is too high, a certain heating time is required for the oil to flow in the inner and outlet pipes. During this process, the pressure in the inlet pipe increases, opening the bypass valve. The oil then flows through the bypass pipe to the outlet of the outlet pipe, further reducing system resistance and achieving oil supply. This air-cooled heat exchange component enables rapid startup of wind turbine generators in low-temperature environments, reduces the impact of low-temperature conditions on motor lifespan, and is not limited by the application site.

[0060] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A wind-cooled heat exchange assembly for supplying oil to a lubrication system of a gearbox of a wind turbine in a low-temperature environment, the wind-cooled heat exchange assembly comprising a core body, wherein the core body comprises an oil inlet pipe, an oil outlet pipe and a plurality of inner pipes, the oil inlet pipe is provided with an oil inlet opening through which oil enters the oil inlet pipe, the oil inlet pipe is further provided with a heater which is inserted into the oil inlet pipe to heat the oil, and the heater is located below the oil inlet opening, the plurality of inner pipes are arranged between the oil inlet pipe and the oil outlet pipe, each of the plurality of inner pipes is connected to the oil inlet pipe and the oil outlet pipe, and oil in the oil inlet pipe flows into the oil outlet pipe through the plurality of inner pipes, the plurality of inner pipes exchange heat with air to cool the oil flowing through the inner pipes, the oil outlet pipe is provided with an oil outlet opening through which oil is discharged from the oil outlet pipe, the core body further comprises a bypass pipe, one end of the bypass pipe is connected to the oil inlet pipe, and the other end of the bypass pipe is connected to the oil outlet pipe above the oil outlet opening, oil in the oil inlet pipe can also flow to the oil outlet opening of the oil outlet pipe through the bypass pipe, the core body further comprises a bypass valve, the bypass valve is arranged at the connection between the oil inlet pipe and the bypass pipe to control the connection or disconnection between the oil inlet pipe and the bypass pipe, the heater is provided with a temperature monitoring meter and a temperature control switch, the temperature monitoring meter is used to monitor the temperature of the oil in the oil inlet pipe and transmit an oil temperature signal to the heater, and the heater controls the opening and closing of the temperature control switch according to the received temperature signal, when the temperature of the oil in the oil inlet pipe is lower than a preset lower temperature limit, the heater opens the temperature control switch to heat the oil, when the temperature of the oil in the oil inlet pipe is higher than a preset upper temperature limit, the heater closes the temperature control switch to stop heating the oil, and within the temperature range formed by the preset lower temperature limit and the preset upper temperature limit, the oil can flow freely. 2.The wind-cooled heat exchange assembly of claim 1, wherein the bypass valve is a pressure-sensitive valve, when the oil pressure in the oil inlet pipe reaches a set valve value, the bypass valve is opened, and the oil inlet pipe is connected to the bypass pipe, and when the oil pressure in the oil inlet pipe is lower than the set valve value, the bypass valve is closed, and the oil inlet pipe is disconnected from the bypass pipe. 3.The wind-cooled heat exchange assembly of claim 1, wherein the wind-cooled heat exchange assembly further comprises a dust screen which is arranged on one side of the core body through which air enters to filter dust and impurities in the air. 4.The wind-cooled heat exchange assembly of claim 1, wherein the wind-cooled heat exchange assembly further comprises a mounting plate which is used to mount and fix the wind-cooled heat exchange assembly on the wind turbine, and the mounting plate is arranged on both sides of the core body and is provided with mounting holes. 5.The wind-cooled heat exchange assembly of claim 4, wherein the core body further comprises a connecting plate which is used to connect and fix the core body to the mounting plate, and the connecting plate is arranged on both sides of the core body and is provided with mounting holes. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The connecting plate and the corresponding mounting plate are connected and fixed through the mounting hole on any side of the core.

6. The air-cooled heat exchange assembly according to claim 1, wherein, The core further comprises a hoisting plate, through which the air-cooled heat exchange assembly can be hoisted for hoisting; The hoisting plate is arranged on the oil inlet pipeline; The core further comprises a standby hole and a plug matched with the standby hole; the standby hole is arranged on the oil outlet pipeline and is used for discharging oil in the core; and the plug is used for closing the standby hole.

7. The air-cooled heat exchange assembly according to claim 1, wherein, The air-cooled heat exchange assembly can be arranged outdoors and exchanges heat with the core through natural wind; or The air-cooled heat exchange assembly further comprises a motor, an axial flow fan and a wind guide cover; the axial flow fan and the wind guide cover are arranged on one side of the core air inlet; the motor drives the axial flow fan to generate forced air which is transmitted to the core through the wind guide cover; The air-cooled heat exchange assembly can be arranged indoors and exchanges heat with the core through forced air.

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