Thin oil lubricating system and lubricating method for fan bearing

Abstract

The invention relates to the technical field of horizontal shaft generator set lubricating systems, in particular to a thin oil lubricating system and method for a fan bearing. The lubricating system comprises an air supply unit, and the air supply unit comprises an air source, an air supply loop and an electromagnetic valve. The gas supply loop comprises a first gas circuit and a second gas circuit, the first gas circuit is connected with a gas source and the oil inlet pipe, and the second gas circuit is connected with the gas source and the oil return pipe; the electromagnetic valves comprise the first electromagnetic valve and the second electromagnetic valve, the first electromagnetic valve is arranged between the distributor and the first gas circuit, and the second electromagnetic valve is arranged between the bearing seat oil pool and the second gas circuit. The problems that lubricating oil is viscous and accumulated in pipelines or channels in parts of a fan bearing lubricating system, a lubricating oil way is blocked, and the lubricating oil way is not easy to be quickly conducted are solved, and the response time of the lubricating system entering a normal working state is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of lubrication systems for horizontal-axis generator sets, and in particular to a thin oil lubrication system and a lubrication method for a fan bearing. Background Art

[0002] With the development of large-scale wind turbines, their transmission chain systems are increasingly adopting a highly integrated structure of gearboxes and main shaft systems, and the lubrication method of the main shaft fan bearings has also begun to change from grease lubrication to oil lubrication. The main shaft fan bearing lubrication system usually does not have a separate lubrication pump station, but directly chooses to divert a path of gear oil from the distributor of the gearbox lubrication system to lubricate and dissipate heat for the fan bearings.

[0003] Since the gearbox distributor is usually located above the gearbox, close to the gearbox and far from the main shaft fan bearing, a long hose or a lubrication pipeline composed of a steel pipe and a hose is usually used to guide the gear oil to the fan bearing end that needs lubrication. Since the low-temperature fluidity of gear oil is poor, its viscosity increases sharply when the oil temperature is below zero, the oil flow resistance in the pipeline increases or even becomes blocked, resulting in insufficient lubrication flow.

[0004] When the unit inevitably shuts down in cold weather, the lubricating oil in the pipeline will inevitably become clogged due to viscosity. At this time, the gearbox lubrication pump starts. Since the resistance in the lubrication pipeline to the fan bearing is greater than the resistance to the gearbox, the lubricating oil enters the gearbox first, causing the main fan bearing to be slowly preheated, unable to reach the required oil volume for a long time, or even unable to discharge oil. This affects the fan startup speed, causes power generation loss, and even causes abnormal wear of the fan bearing. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of an embodiment of the present invention is to provide a thin oil lubrication system for fan bearings, which effectively solves the problem of viscous accumulation of lubricating oil in the internal pipes or channels of the components of the fan bearing lubrication system after the existing fan is shut down for a long time under low temperature conditions, blocking the lubricating oil circuit and being difficult to be quickly opened, thereby improving the response time of the lubrication system to enter a normal working state.

[0006] In order to achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] A thin oil lubrication system for fan bearings, comprising a distributor, an oil inlet pipe, a bearing seat oil pool and an oil return pipe arranged in sequence along an oil circuit, and also comprising an air supply unit, the air supply unit comprising an air source, an air supply circuit and a solenoid valve; the air supply circuit comprises a first air circuit and a second air circuit, the first air circuit connects the air source and the oil inlet pipe, and the second air circuit connects the air source and the oil return pipe; the solenoid valve comprises a first solenoid valve and a second solenoid valve, the first solenoid valve is arranged between the distributor and the first air circuit, and the second solenoid valve is arranged between the bearing seat oil pool and the second air circuit.

[0008] Optionally, the solenoid valve is a two-position two-way solenoid valve, and the solenoid valve is a normally open valve. When a normally open two-position two-way solenoid valve is used, when the air supply unit is working, the solenoid valve is powered on and closed, which can effectively prevent compressed air from flowing to the distributor, avoid air waste and damage to other components; when the air supply unit is not working, the solenoid valve is in a normally open state, which will not hinder the normal flow of lubricating oil, ensuring that the lubricating oil can smoothly enter the nozzle through the distributor and the oil inlet pipe, spray lubricate the fan bearing, and flow back to the gear box through the return oil pipe, so as to achieve the normal circulation of the entire lubrication system, ensure the lubrication and heat dissipation effect of the fan bearing, and maintain the stable operation of the wind turbine generator set.

[0009] Optionally, a one-way valve is also provided on the air supply circuit, and the one-way valve includes a first one-way valve and a second one-way valve. The first one-way valve is arranged on the first air path and unidirectionally guides the air source to the oil inlet pipe. The second solenoid valve is arranged on the second air path and unidirectionally guides the air source to the oil return pipe.

[0010] The setting of the one-way valve plays a key protective role. When the air supply unit is not working, it can prevent oil from entering the air supply unit, avoid oil pollution or damage to the air supply unit, and ensure the normal operation and service life of the air supply unit; at the same time, when the air supply unit is working, the one-way valve cooperates with the closing of the solenoid valve to further ensure that the compressed air flows in the predetermined direction, and only the oil inlet pipe and oil return pipe that need to be cleaned are blown and cleaned, thereby improving the cleaning efficiency, avoiding compressed air from entering other pipelines and causing unnecessary influence, ensuring the stable and reliable operation of the entire lubrication system, effectively solving the problem of lubrication oil circuit blockage under low temperature conditions, and improving the response speed and reliability of the lubrication system.

[0011] Optionally, an air filter is also provided on the air supply circuit, and the air filter is provided between the air source and the one-way valve. The air filter is mainly used to filter impurities contained in the compressed air, such as dust, particles, etc., to ensure the cleanliness of the compressed air entering the air supply circuit. This can prevent impurities from entering the pipelines, nozzles and other components of the lubrication system, prevent impurities from causing damage such as wear and blockage to these components, extend the service life of the components, and ensure the normal operation of the lubrication system. At the same time, clean compressed air also helps to improve the effect of blowing to clean the pipeline, more effectively clean out the viscous lubricating oil from the pipeline, ensure the oil circuit is unobstructed, further improve the reliability of the lubrication system, and ensure the normal startup and stable operation of the wind turbine generator set under low temperature conditions.

[0012] Optionally, the lubrication system further includes an oil source, the oil source is connected to the distributor, the distributor is divided into two oil circuits, one oil circuit is connected to the oil inlet pipe, and the other oil circuit is connected to the gear box.

[0013] Optionally, the oil return port of the oil return pipe is connected to the gear box, and the oil return port of the gear box is connected to the oil source.

[0014] Optionally, the oil inlet pipe is connected to a nozzle, and the nozzle sprays oil toward the fan bearing. The bearing seat oil pool is located at the lower side of the fan bearing. A pressure sensor and a temperature sensor are installed between the end of the oil inlet pipe and the front end of the nozzle.

[0015] Optionally, an electric heater is provided in the bearing seat oil pool, and the electric heater is a constant temperature heater.

[0016] Optionally, it also includes a control system, which is electrically connected to the gas source, oil source, solenoid valve, pressure sensor and temperature sensor.

[0017] The embodiment of the present invention further provides a lubrication method using the thin oil lubrication system of the fan bearing as described above, comprising:

[0018] Before the fan is started, if the oil inlet pipe temperature is lower than the set value, the solenoid valve is powered on and closed, the air source is powered on and supplied, and compressed air enters the oil inlet pipe and the oil return pipe to blow and clean the inside of the pipe;

[0019] After the pipeline is blown for a preset time, the air source is powered off and stopped, the solenoid valve is powered off and turned on, and the gear oil enters the nozzle through the distributor, solenoid valve, and oil inlet pipe to spray and lubricate the fan bearing.

[0020] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0021] The fan bearing thin oil lubrication system of the present invention adds an air supply unit to the conventional lubrication system, and the air supply unit includes an air source, an air supply circuit and a solenoid valve, wherein the air supply circuit is provided with a first air circuit and a second air circuit, respectively connecting the air source and the oil inlet pipe, and the air source and the oil return pipe, and the solenoid valve includes a first solenoid valve and a second solenoid valve, respectively arranged between the distributor and the first air circuit and between the bearing seat oil pool and the second air circuit. Such a structural design allows the oil inlet pipe and the oil return pipe to be blown and cleaned by compressed air through the cooperation of the solenoid valve and the air source before the fan is started, when the temperature of the oil inlet pipe is lower than the set value, effectively solving the problem of viscous lubricating oil blocking the pipeline under low temperature conditions, ensuring the unobstructed oil circuit, creating conditions for the normal delivery of subsequent lubricating oil, improving the response time of the lubrication system to enter a normal working state, avoiding problems such as abnormal wear of the fan bearings due to insufficient lubrication, and ensuring the stable operation of the wind turbine generator set.

[0022] Advantages of additional aspects of the present invention will be given in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In addition, the spacing or size between the components is exaggerated to show the positions of the components, and the schematic diagram is only used for illustration.

[0024] Figure 1 Schematic diagram of a thin oil lubrication system for a fan bearing provided by an embodiment of the present invention;

[0025] In the figure: 1, gear box; 2, distributor; 31, first solenoid valve; 32, second solenoid valve; 41, first one-way valve; 42, second one-way valve; 5, control system; 6, pressure sensor; 7, temperature sensor; 8, nozzle; 9, fan bearing; 10, bearing seat oil pool; 11, heater; 12, air filter; 13, air source; 14, oil source; 15, oil inlet pipe; 16, oil return pipe; DETAILED DESCRIPTION

[0026] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0027] Example 1

[0028] like Figure 1 As shown, this embodiment proposes a thin oil lubrication system for a fan bearing 9, including a distributor 2, an oil inlet pipe 15, a bearing seat oil pool 10 and an oil return pipe 16 arranged in sequence along the oil circuit, and also includes an air supply unit, the air supply unit includes an air source 13, an air supply circuit and a solenoid valve; the air supply circuit includes a first air circuit and a second air circuit, the first air circuit connects the air source 13 and the oil inlet pipe 15, and the second air circuit connects the air source 13 and the oil return pipe 16; the solenoid valve includes a first solenoid valve 31 and a second solenoid valve 32, the first solenoid valve 31 is arranged between the distributor 2 and the first air circuit, and the second solenoid valve 32 is arranged between the bearing seat oil pool 10 and the second air circuit.

[0029] When the air supply unit is working, the solenoid valve is energized to disconnect the oil source 14 from the oil inlet pipe 15, thereby preventing compressed air from entering the oil source 14 and the gearbox 1, thereby avoiding affecting the cleaning effect of the lubrication pipeline or even causing damage to the oil source 14.

[0030] The lubrication system can realize automatic air blowing and clearing of the lubrication oil inlet pipe 15 and the oil return pipe 16 when the lubrication pipeline and the channel are blocked due to the increased viscosity of the lubricating oil under low temperature conditions. In addition, when maintaining the lubrication pipeline, the nozzle 8, etc., the oil in the pipeline can be cleaned with the air supply unit first to avoid oil leakage during disassembly and contamination of the cabin.

[0031] The two-position two-way solenoid valve is a normally open valve, and the diameter is large enough to ensure its on state when power is off and reduce throttling pressure loss. When the solenoid valve is not powered, its valve core is in the oil-passing state; when the solenoid valve is powered, its valve core is in the oil-cutting state. The solenoid valve should also have a manual function and a locking device. In addition, the solenoid valve should be as close as possible to the oil inlet distributor 2 and the bearing seat oil pool 10.

[0032] A one-way valve is also provided on the air supply circuit, and the one-way valve includes a first one-way valve 41 and a second one-way valve 42. The first one-way valve 41 is arranged on the first air path, and unidirectionally guides the air source 13 to the oil inlet pipe 15. The second solenoid valve 32 is arranged on the second air path, and unidirectionally guides the air source 13 to the oil return pipe 16.

[0033] The circuit is unidirectionally conducted through a one-way valve. When the air supply unit is working, the one-way valve opens, allowing only air to enter the lubrication system circuit, and not allowing lubricating oil to enter the pneumatic circuit, to prevent compressed air from entering pipelines that do not need to be cleaned, causing air waste, and even causing air source 13 pollution and component damage. The one-way valve should be a one-way valve with spring return but the spring opening pressure is not greater than 0.5 bar to ensure its reliable normally closed state and pressure loss of the air supply circuit.

[0034] The air supply circuit is also provided with an air filter 12, which is arranged between the air source 13 and the one-way valve to achieve good separation of particulate matter and condensed water in the air, and prevent debris and moisture from entering the lubrication system and causing damage and pollution to the fan bearing 9 and the lubricating oil.

[0035] The lubrication system also includes an oil source 14, the oil source 14 is connected to the distributor 2, the distributor 2 is divided into two oil circuits, one oil circuit is connected to the oil inlet pipe 15, and the other oil circuit is connected to the gear box 1. This design enables the lubricating oil source 14 to provide lubricating oil to the fan bearing 9 and the gear box 1 at the same time, realizing one source for multiple uses, improving the utilization rate of the lubricating oil source 14, simplifying the system structure, and reducing costs. The lubricating oil is reasonably distributed through the distributor 2 to ensure that the fan bearing 9 and the gear box 1 can obtain sufficient lubricating oil to meet their respective lubrication and heat dissipation needs, ensure the normal operation of the transmission chain system of the wind turbine generator set, and improve the reliability and stability of the entire unit. At the same time, it is also convenient for centralized management and maintenance of the lubricating oil source 14, improve maintenance efficiency, and reduce maintenance costs.

[0036] The oil return port of the oil return pipe 16 is connected to the gear box 1, and the oil return port of the gear box 1 is connected to the oil source 14. Such an oil return design forms a complete lubricating oil circulation loop. The lubricating oil in the oil pool of the fan bearing 9 flows back to the gear box 1 through the oil return pipe 16. After the lubricating oil in the gear box 1 returns to the oil source 14, it is re-transported to the distributor 2 by the oil source 14 and distributed to the fan bearing 9 and the gear box 1 for lubrication. Through this circulation loop, the recycling of lubricating oil is realized, the use efficiency of lubricating oil is improved, and the consumption cost of lubricating oil is reduced.

[0037] The oil inlet pipe 15 is connected to the nozzle 8, and the nozzle 8 sprays oil toward the fan bearing 9. The bearing seat oil pool 10 is located at the lower side of the fan bearing 9. The fan bearing 9 is sprayed and lubricated through the oil inlet pipe 15 and the nozzle 8. The fan bearing 9 is immersed and the oil returns to the gear box 1 oil tank for filtration and heat dissipation through the bearing seat oil pool 10 and the oil return pipe 16.

[0038] A pressure sensor 6 and a temperature sensor 7 are installed between the end of the oil inlet pipe 15 and the front end of the nozzle 8 to improve the accuracy of detection, and their signals should be connected to the lubrication control system 5. The sensor monitors the lubricating oil temperature and oil pressure, and its signal is connected to the control system 5 to judge whether the lubricating oil flow meets the requirements. The working state of the lubrication system is automatically monitored and identified by the pressure sensor 6 and the temperature sensor 7 to ensure the normal operation of the lubrication system.

[0039] The bearing seat oil pool 10 is provided with an electric heater 11, which is a constant temperature heater 11. When the oil temperature reaches the upper limit of the set temperature value, it automatically stops, and when it is lower than the lower limit of the set temperature value, it automatically starts. When the fan is on standby in winter, it will always be in a working state, so that the oil temperature is always higher than the lower limit of the set value, ensuring the effect of immersion lubrication of the fan bearing 9.

[0040] The lubrication system further includes a control system 5, which is electrically connected to the air source 13, the oil source 14, the solenoid valve, the pressure sensor 6 and the temperature sensor 7 and can control their actions. The control system 5 can be a fan master control system or an independent control unit. When it is an independent control unit, it can have the ability to communicate with the fan master control.

[0041] The lubrication system introduces an air supply unit to realize the cleaning function of the viscous oil in the lubrication pipeline under low temperature conditions. Moreover, when the lubrication pipeline and the nozzle 8 are maintained and disassembled, the oil in the pipeline can be cleaned in advance through the air supply unit, which is conducive to reducing oil leakage. In addition, an electric heater 11 is added to the bearing seat oil pool 10 to realize the lubrication effect of the oil pool on the fan bearing 9 during low temperature shutdown.

[0042] Example 2

[0043] This embodiment proposes a lubrication method using a thin oil lubrication system for a fan bearing 9 as described in Embodiment 1. An air source 13 provides compressed air to clean up the viscous lubricating oil that is accumulated and clogged in the oil inlet pipe 15, the nozzle 8, and the oil return pipe 16 of the lubrication system through a one-way valve to ensure that the oil circuit is unobstructed. At the same time, the pressure sensor 6 and the temperature sensor 7 are used to monitor whether the pressure and temperature of the lubricating oil at the nozzle 8 reach the expected values, so as to determine whether the amount of lubricating oil meets the design requirements.

[0044] Specifically:

[0045] Before the fan is started, the control system 5 determines the temperature in the oil inlet pipe 15 through the temperature sensor 7. If the temperature is lower than the set value, the solenoid valve is powered on and closed, the air source 13 is powered on, and the compressed air enters the lubrication oil inlet pipe 15 and the oil return pipe 16 through the air filter and the one-way valve to blow and clean the inside of the pipeline. The high-pressure air cleans and clears the viscous gear oil attached to the pipe wall and blocked pipelines and nozzles, making the pipeline unobstructed.

[0046] When the pipeline blowing time reaches the set value, the gas source 13 is powered off and stopped, the solenoid valve is powered off and turned on, the lubricating oil source 14 is started, and the gear oil enters the nozzle 8 through the distributor 2, the solenoid valve, and the oil inlet pipe 15 to spray and lubricate the fan bearing 9. The oil falls into the bearing seat oil pool 10, and flows back to the gear box 1 through the solenoid valve and the return oil pipe 16.

[0047] This lubrication method can quickly restore the normal working state of the lubrication system under low temperature conditions, improve the response speed of the lubrication system, reduce the abnormal wear of the fan bearing 9 caused by insufficient lubrication, ensure the normal start-up and stable operation of the wind turbine generator set, and improve the power generation efficiency and reliability of the unit. It has significant technical effects and practical application value.

[0048] In addition, when the pipeline is maintained, the blowing system can be manually opened for a certain period of time to drain the oil in the oil inlet pipe 15 and the nozzle 8 before disassembling the pipeline. This can effectively avoid leakage of residual oil in the pipeline and nozzle 8 after disassembly, reduce pollution, and improve construction quality.

[0049] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A thin oil lubrication system for a fan bearing, comprising a distributor, an oil inlet pipe, a bearing seat oil pool and an oil return pipe arranged in sequence along an oil circuit, characterized in that: Also includes an air supply unit, the air supply unit includes an air source, an air supply circuit and a solenoid valve; The air supply circuit comprises a first air circuit and a second air circuit, the first air circuit is connected to the air source and the oil inlet pipe, and the second air circuit is connected to the air source and the oil return pipe; The solenoid valve comprises a first solenoid valve and a second solenoid valve, wherein the first solenoid valve is arranged between the distributor and the first gas path, and the second solenoid valve is arranged between the bearing seat oil pool and the second gas path.

2. The thin oil lubrication system for fan bearings according to claim 1, characterized in that: The solenoid valve is a two-position two-way solenoid valve, and the solenoid valve is a normally open valve.

3. The thin oil lubrication system for fan bearings according to claim 1, characterized in that: A one-way valve is also provided on the air supply circuit, and the one-way valve includes a first one-way valve and a second one-way valve. The first one-way valve is arranged on the first air path and unidirectionally guides the air source to the oil inlet pipe. The second solenoid valve is arranged on the second air path and unidirectionally guides the air source to the oil return pipe.

4. The thin oil lubrication system for fan bearings according to claim 3, characterized in that: The air supply circuit is also provided with an air filter, and the air filter is arranged between the air source and the one-way valve.

5. The thin oil lubrication system for fan bearings according to claim 4, characterized in that: The lubrication system also includes an oil source, which is connected to the distributor. The distributor divides into two oil circuits, one of which is connected to the oil inlet pipe and the other is connected to the gear box.

6. The thin oil lubrication system for fan bearings according to claim 5, characterized in that: The oil return port of the oil return pipe is connected to the gear box, and the oil return port of the gear box is connected to the oil source.

7. The thin oil lubrication system for fan bearings according to claim 6, characterized in that: The oil inlet pipe is connected to a nozzle, and the nozzle sprays oil toward the fan bearing. The bearing seat oil pool is located at the lower side of the fan bearing. A pressure sensor and a temperature sensor are installed between the end of the oil inlet pipe and the front end of the nozzle.

8. The thin oil lubrication system for fan bearings according to claim 7, characterized in that: An electric heater is arranged in the bearing seat oil pool, and the electric heater is a constant temperature heater.

9. The thin oil lubrication system for fan bearings according to claim 7, characterized in that: It also includes a control system, which is electrically connected to the gas source, oil source, solenoid valve, pressure sensor and temperature sensor.

10. A lubrication method using the thin oil lubrication system of a fan bearing according to any one of claims 1 to 9, characterized in that: include: Before the fan is started, if the oil inlet pipe temperature is lower than the set value, the solenoid valve is powered on and closed, the air source is powered on and supplied, and compressed air enters the oil inlet pipe and the oil return pipe to blow and clean the inside of the pipe; After the pipeline is blown for a preset time, the air source is powered off and stopped, the solenoid valve is powered off and turned on, and the gear oil enters the nozzle through the distributor, solenoid valve, and oil inlet pipe to spray and lubricate the fan bearing.

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