Gear box pressure control system and method based on pressure follow-up temperature control valve

Abstract

The invention belongs to the technical field of automatic control, and relates to a gearbox pressure control system and method based on a pressure follow-up temperature control valve. The system comprises an oil temperature detection sensor, a controller, a filter, a pressure follow-up temperature control valve, an air cooler, a distributor and a gearbox. The pressure follow-up temperature control valve is adopted, the problem of oil temperature control faults can be solved, and the service life of the temperature control valve is prolonged; when the oil temperature is reduced, the pressure valve spring is in a contraction state, and the oil passes through the bypass and the air cooler and then flows back to the gearbox through the distributor; and along with the continuous reduction of the temperature, the pressure follow-up temperature control valve spring is completely shrunk, and the oil passes through the pressure follow-up temperature control valve and then flows back to the gear box through the distributor.

Description

Technical Field

[0001] The present invention belongs to the field of automatic control technology, and in particular, relates to a gear box pressure control system and method based on a pressure follower temperature control valve. Background Art

[0002] When a wind turbine is in operation, the gearbox temperature control valve is prone to malfunction during use, resulting in an inability to adjust the oil temperature, which ultimately affects the operation of the power supply unit. Moreover, once the temperature control valve fails, it can only be replaced and cannot be repaired, which will not only result in a large waste of resources, but also cause serious economic losses to the power generation company.

[0003] The existing wind turbines are large in scale and use a large number of temperature control valves in oil temperature regulation. The temperature control valves used in the existing wind turbines have a short life. To ensure the safe and stable operation of the wind turbines, on the one hand, as long as an abnormal alarm of excessive oil temperature occurs, the original temperature control valve will be replaced; on the other hand, once the temperature control valve has been in operation for a certain period of time, it will be replaced.

[0004] The temperature control valve used in the existing unit pushes the valve stem through the rubber bag during operation, thereby pushing the valve core to move. When the rubber bag is damaged, the overall function of the temperature control valve fails and the flow direction of the lubrication system cannot be switched normally.

[0005] In the existing gearbox temperature control valve, the paraffin in the temperature sensing element is heated, causing the originally solid paraffin to begin to turn into liquid, and the volume continues to increase, prompting the compression rubber sleeve to push the push rod outward, gradually allowing the entire valve core to move, thereby reasonably distributing the lubricating oil in the gearbox. In order to enhance the thermal conductivity of paraffin, appropriate alloy powder is basically added. Because the operating environment of paraffin is high temperature for a long time, the liquefaction phenomenon is very obvious, and a large amount of alloy powder begins to settle, weakening the function of the temperature sensing element. The specific manifestation of this phenomenon is that after the number of times the temperature sensing element is operated continues to increase, the frequency of high-temperature expansion and low-temperature contraction will increase, causing the expansion effect to become weaker and weaker. Therefore, during the operation of the gearbox temperature control valve, if such a fault occurs, the temperature control valve can only be replaced, and the wind turbine needs to be shut down, which affects the efficiency and quality of power supply and also causes significant resource losses. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a gear box pressure control system and method based on a pressure follower temperature control valve.

[0007] In a first aspect, the present invention provides a gearbox pressure control system based on a pressure follower temperature control valve, comprising an oil temperature detection sensor, a controller, a filter, a pressure follower temperature control valve, an air cooler, a distributor and a gearbox;

[0008] The oil temperature detection unit is arranged in the gear box; the oil temperature detection unit is connected to the input end of the controller by electrical signal; the pressure follower temperature control valve is arranged in the input end oil circuit of the air cooler and is located in the filter of the wind turbine; the air cooler is arranged between the filter and the distributor; the distributor is arranged at the inlet of the gear box;

[0009] The controller sets a first oil temperature threshold and a second oil temperature threshold. When the oil temperature is greater than or equal to the first oil temperature threshold, the oil in the gearbox completely passes through the cooler and reaches the gearbox through the distributor.

[0010] When the oil temperature is less than or equal to the first oil temperature and greater than or equal to the second oil temperature threshold, the controller sets a linear relationship between the oil temperature and the pressure follower temperature control valve, and controls the opening of the pressure follower temperature control valve at the input end of the air cooler according to the oil temperature; the oil of the gear box passes through the cooler and the distributor to the gear box, and the other way flows back to the gear box through the bypass; the first oil temperature threshold is less than the second oil temperature threshold;

[0011] When the oil temperature is lower than the second oil temperature threshold, the oil in the gearbox passes through the air cooler and the distributor to reach the gearbox.

[0012] In a second aspect, the present invention provides a gearbox pressure control method based on a pressure follower temperature control valve, comprising:

[0013] Use the oil temperature detection sensor to detect the oil temperature;

[0014] The controller sets a first oil temperature threshold and a second oil temperature threshold. When the oil temperature is greater than or equal to the first oil temperature threshold, the oil in the gearbox completely passes through the cooler and reaches the gearbox through the distributor.

[0015] When the oil temperature is less than or equal to the first oil temperature and greater than or equal to the second oil temperature threshold, the controller sets a linear relationship between the oil temperature and the pressure follower temperature control valve, and controls the opening of the pressure follower temperature control valve at the input end of the air cooler according to the oil temperature; the oil of the gear box passes through the cooler and the distributor to the gear box, and the other way flows back to the gear box through the bypass; the first oil temperature threshold is less than the second oil temperature threshold;

[0016] When the oil temperature is lower than the second oil temperature threshold, the oil in the gearbox passes through the air cooler and the distributor to reach the gearbox.

[0017] Based on the above technical solution, the present invention can also be improved as follows.

[0018] Furthermore, the first oil temperature threshold is 45°C; the second oil temperature threshold is 60°C.

[0019] Furthermore, the controller is connected with an alarm and a display.

[0020] Furthermore, the controller is connected to a wireless communication module; the controller is connected to the mobile terminal via the wireless communication module.

[0021] Furthermore, an oil drain port is installed at the bottom of the gear box; an oil drain valve is provided at the oil drain port; and the output end of the controller is connected to the electrical signal of the oil drain valve.

[0022] Furthermore, assuming that the opening of the pressure follower temperature control valve is s, the oil temperature is H, the first oil temperature threshold is h1, and the second oil temperature threshold is h2, the opening of the pressure follower temperature control valve is:

[0023]

[0024] Furthermore, the controller sets a third oil temperature threshold value. When the oil temperature is greater than or equal to the third oil temperature threshold value, the controller controls the oil drain valve at the bottom oil drain port of the gear box to open.

[0025] The beneficial effects of the present invention are as follows: the present invention adopts a pressure follower temperature control valve, which can solve the problem of oil temperature control failure and extend the service life of the temperature control valve; when the oil temperature decreases, the pressure valve spring is in a contracted state, and the oil passes through the bypass and the air cooler, and then flows back to the gear box through the distributor; as the temperature continues to decrease, the pressure follower temperature control valve spring is completely contracted, and the oil passes through the pressure follower temperature control valve, and then flows back to the gear box through the distributor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a gearbox pressure control system based on a pressure follower temperature control valve provided in Example 1 of the present invention;

[0027] Figure 2 Schematic diagram of the gearbox pressure control method based on the pressure follower temperature control valve provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Example 1

[0030] As an example, Figure 1 As shown, in order to solve the above technical problems, this embodiment provides a gearbox pressure control system based on a pressure follower temperature control valve, including an oil temperature detection sensor, a controller, a filter, a pressure follower temperature control valve, an air cooler, a distributor and a gearbox;

[0031] The oil temperature detection unit is arranged in the gear box; the oil temperature detection unit is connected to the input end of the controller by electrical signal; the pressure follower temperature control valve is arranged in the input end oil circuit of the air cooler and is located in the filter of the wind turbine; the air cooler is arranged between the filter and the distributor; the distributor is arranged at the inlet of the gear box;

[0032] The controller sets a first oil temperature threshold and a second oil temperature threshold. When the oil temperature is greater than or equal to the first oil temperature threshold, the oil in the gearbox completely passes through the cooler and reaches the gearbox through the distributor.

[0033] When the oil temperature is less than or equal to the first oil temperature and greater than or equal to the second oil temperature threshold, the controller sets a linear relationship between the oil temperature and the pressure follower temperature control valve, and controls the opening of the pressure follower temperature control valve at the input end of the air cooler according to the oil temperature; the oil of the gear box passes through the cooler and the distributor to the gear box, and the other way flows back to the gear box through the bypass; the first oil temperature threshold is less than the second oil temperature threshold;

[0034] When the oil temperature is lower than the second oil temperature threshold, the oil in the gearbox passes through the air cooler and the distributor to reach the gearbox.

[0035] The working principle of the pressure follower temperature control valve is that when the temperature is high, the oil completely flows back to the gear box through the air cooler and the distributor; when the oil temperature drops, the pressure valve spring is in a contracted state, and the oil passes through the bypass and the air cooler, and then flows back to the gear box through the distributor; as the temperature continues to drop, the pressure follower temperature control valve spring is completely contracted, the oil passes through the pressure follower temperature control valve, and then flows back to the gear box through the distributor.

[0036] Currently, most wind turbines use temperature control valves to adjust the temperature of lubricating oil. Once the temperature control valve loses its function, the oil temperature cannot be adjusted, increasing economic losses and affecting the stable operation of the wind turbine. The present invention adopts a pressure follower temperature control valve, which can solve the problem of oil temperature control failure and extend the service life of the temperature control valve.

[0037] When the lubrication system starts at low temperature, the electric pump rotates and pumps the gearbox oil to supply oil to the filter, pressure valve and cooler. Since the viscosity of the oil is high in a low temperature environment, the pressure loss of the cooler plate is large. When the pressure before and after the cooler plate is greater than the set threshold, most of the oil flows to the gearbox through the low-temperature oil channel, and a small amount of oil pushes the solidified oil inside the cooler plate to the gearbox through the high-temperature oil circuit. The function of the gearbox heater is to heat the system oil. As the oil temperature gradually increases, the oil viscosity decreases, and the pressure difference before and after the cooler plate gradually decreases. When the pressure difference is lower than the set value of the pressure follower temperature control valve, the pressure follower temperature control valve closes, and all the oil flows through the cooler plate to the gearbox.

[0038] Optionally, the first oil temperature threshold is 45°C; the second oil temperature threshold is 60°C.

[0039] When the oil temperature is lower than 45℃, the oil goes to the gearbox through the low-temperature oil circuit. When the oil temperature is between 45-60℃, the oil goes to the gearbox through the low-temperature oil circuit and the high-temperature oil circuit. When the oil temperature is higher than 60℃, all the oil goes to the gearbox through the high-temperature oil circuit through the air cooler.

[0040] Optionally, the controller is connected to an alarm and a display.

[0041] The oil temperature is displayed in real time on the display, and when the oil temperature is higher than the set oil temperature threshold, the alarm will sound.

[0042] Optionally, the controller is connected to a wireless communication module; the controller is connected to the mobile terminal via the wireless communication module.

[0043] The controller communicates with the mobile terminal via a wireless communication module and transmits the oil temperature data to the mobile terminal to realize remote monitoring.

[0044] Optionally, an oil drain port is installed at the bottom of the gear box; an oil drain valve is provided at the oil drain port; and the output end of the controller is connected to the electrical signal of the oil drain valve.

[0045] The oil drain port can discharge the dirt in the gear box, and the contaminated oil can be discharged through the oil drain valve after being output by the gear pump.

[0046] Example 2

[0047] Based on the same principle as the gearbox pressure control system based on the pressure follower temperature control valve in Example 1, as shown in the attached Figure 2 As shown, this embodiment provides a gearbox pressure control method based on a follow-up temperature control valve, including:

[0048] Use the oil temperature detection sensor to detect the oil temperature;

[0049] The controller sets a first oil temperature threshold and a second oil temperature threshold. When the oil temperature is greater than or equal to the first oil temperature threshold, the oil in the gearbox completely passes through the cooler and reaches the gearbox through the distributor.

[0050] When the oil temperature is less than or equal to the first oil temperature and greater than or equal to the second oil temperature threshold, the controller sets a linear relationship between the oil temperature and the pressure follower temperature control valve, and controls the opening of the pressure follower temperature control valve at the input end of the air cooler according to the oil temperature; the oil of the gear box passes through the cooler and the distributor to the gear box, and the other way flows back to the gear box through the bypass; the first oil temperature threshold is less than the second oil temperature threshold;

[0051] When the oil temperature is lower than the second oil temperature threshold, the oil in the gearbox passes through the air cooler and the distributor to reach the gearbox.

[0052] Optionally, assuming that the opening of the pressure follower temperature control valve is s, the oil temperature is H, the first oil temperature threshold is h1, and the second oil temperature threshold is h2, the opening of the pressure follower temperature control valve is:

[0053]

[0054] Optionally, the controller sets a third oil temperature threshold, and when the oil temperature is greater than or equal to the third oil temperature threshold, the controller controls the oil drain valve at the bottom oil drain port of the gear box to open.

[0055] When the oil temperature is too high, that is, the oil temperature is greater than the third oil temperature threshold value such as 80°C, part of the oil is discharged through the oil drain valve after stopping the equipment to prevent the oil temperature from continuing to rise and causing damage to the gearbox.

[0056] When the lubrication system is working, the working oil pump system provides pressurized lubricating oil, which passes through a single-tube double-precision filter and then reaches the follow-up temperature control valve, which controls the flow direction of the lubricating oil according to the temperature of the lubricating oil. When the oil temperature is lower than 45°C, the oil flows to the gearbox through the low-temperature oil circuit. When the oil temperature is between 45°C and 60°C, the oil flows to the gearbox through the low-temperature and high-temperature oil circuits. When the oil temperature is higher than 60°C, all the oil flows to the gearbox through the high-temperature oil circuit.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. The gearbox pressure control system based on the pressure follower temperature control valve is characterized in that: It includes oil temperature detection sensor, controller, filter, pressure follow-up temperature control valve, air cooler, distributor and gear box; The oil temperature detection unit is arranged in the gear box; the oil temperature detection unit is connected to the input end of the controller by electrical signal; the pressure follower temperature control valve is arranged in the input end oil circuit of the air cooler and is located in the filter of the wind turbine; the air cooler is arranged between the filter and the distributor; the distributor is arranged at the inlet of the gear box; The controller sets a first oil temperature threshold and a second oil temperature threshold. When the oil temperature is greater than or equal to the first oil temperature threshold, the oil in the gearbox completely passes through the cooler and reaches the gearbox through the distributor. When the oil temperature is less than or equal to the first oil temperature and greater than or equal to the second oil temperature threshold, the controller sets a linear relationship between the oil temperature and the pressure follower temperature control valve, and controls the opening of the pressure follower temperature control valve at the input end of the air cooler according to the oil temperature; the oil of the gear box passes through the cooler and the distributor to the gear box, and the other way flows back to the gear box through the bypass; the first oil temperature threshold is less than the second oil temperature threshold; When the oil temperature is lower than the second oil temperature threshold, the oil in the gearbox passes through the air cooler and the distributor to reach the gearbox.

2. The gearbox pressure control system based on the pressure follower temperature control valve according to claim 1 is characterized in that: The first oil temperature threshold is 45°C; the second oil temperature threshold is 60°C.

3. The gearbox pressure control system based on the pressure follower temperature control valve according to claim 1 is characterized in that: The controller is connected with an alarm and a display.

4. The gearbox pressure control system based on the pressure follower temperature control valve according to claim 1 is characterized in that: The controller is connected to a wireless communication module; the controller is connected to a mobile terminal via the wireless communication module.

5. The gearbox pressure control system based on the pressure follower temperature control valve according to claim 1 is characterized in that: An oil drain port is installed at the bottom of the gear box; an oil drain valve is provided at the oil drain port; and the output end of the controller is connected with the electrical signal of the oil drain valve.

6. A gearbox pressure control method based on a pressure follower temperature control valve, characterized in that: include: Use the oil temperature detection sensor to detect the oil temperature; The controller sets a first oil temperature threshold and a second oil temperature threshold. When the oil temperature is greater than or equal to the first oil temperature threshold, the oil in the gearbox completely passes through the cooler and reaches the gearbox through the distributor. When the oil temperature is less than or equal to the first oil temperature and greater than or equal to the second oil temperature threshold, the controller sets a linear relationship between the oil temperature and the pressure follower temperature control valve, and controls the opening of the pressure follower temperature control valve at the input end of the air cooler according to the oil temperature; the oil of the gear box passes through the cooler and the distributor to the gear box, and the other way flows back to the gear box through the bypass; the first oil temperature threshold is less than the second oil temperature threshold; When the oil temperature is lower than the second oil temperature threshold, the oil in the gearbox passes through the air cooler and the distributor to reach the gearbox.

7. The gearbox pressure control method based on the pressure follower temperature control valve according to claim 6 is characterized in that: Assume that the opening of the pressure follower temperature control valve is s, the oil temperature is H, the first oil temperature threshold is h1, and the second oil temperature threshold is h2, then the opening of the pressure follower temperature control valve is:

8. The gearbox pressure control method based on the pressure follower temperature control valve according to claim 6 is characterized in that: The controller sets a third oil temperature threshold value. When the oil temperature is greater than or equal to the third oil temperature threshold value, the controller controls the oil drain valve at the bottom oil drain port of the gear box to open.

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