Fan blade anti-icing system and operation method

Abstract

The invention relates to a fan blade anti-icing system and an operation method, the system comprises a gear box, a heat exchange bin and an air compressor, the gear box and the heat exchange bin are located in a fan cabin, and the air compressor is located in the fan cabin; a cooling pipeline is communicated between an oil inlet and an oil outlet of the gear box, and a cooling system is arranged on the cooling pipeline; an oil supply bypass pipe is communicated between the cooling pipeline at the oil outlet of the gear box and the oil inlet of the heat exchange bin, an oil return bypass pipe is communicated between the cooling pipeline at the oil inlet of the gear box and the oil outlet of the heat exchange bin, and an oil return pump is arranged on the oil return bypass pipe; an air inlet of the heat exchange bin is communicated with the air compressor, an air outlet of the heat exchange bin is communicated with a heat supply pipe, and the heat supply pipe penetrates through the cabin and is inserted into the inner cavity of the blade; when the blades are heated, the gear box oil outlet, the oil supply bypass pipe, the heat exchange bin, the oil return bypass pipe and the gear box oil inlet form a channel to bypass the cooling system. According to the system and the operation method, the fan blades can be effectively prevented from being iced.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and in particular to a fan blade anti-icing system and an operating method. Background Art

[0002] As the main equipment in the current new energy power generation field, wind turbines have been rapidly developing towards large-capacity single-unit in recent years, greatly improving the rated power generation of single-unit and wind energy utilization efficiency. In the application process in recent years, it has been gradually discovered that wind turbines in some areas have blade icing problems during winter operation, which greatly affects the safety of wind turbines in winter operation and the reliability of equipment.

[0003] In response to this problem, technicians have explored wind turbine blade deicing methods from multiple directions, including anti-icing coatings, electric heating wires on the blade surface, and hot air deicing. Although these methods can effectively remove the ice layer on the surface of wind turbine blades, they often rely on external power supply heating resistors or the coating ages and falls off. These problems lead to certain energy consumption and safety hazards of electric heating when deicing the wind turbine. Therefore, in response to the above problems of existing deicing solutions, the development of a blade anti-icing system and operation method that utilizes existing heat sources is of great practical significance for ensuring the safe and stable operation of wind turbines in areas prone to icing in winter. Summary of the invention

[0004] The present invention provides a wind turbine blade anti-icing system and an operating method, which effectively improve the adaptability of a wind turbine to a natural environment and improve the reliability of the wind turbine in an ice-prone season.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A fan blade anti-icing system comprises a gear box, a heat exchange chamber and an air compressor, wherein the gear box and the heat exchange chamber are located in a fan nacelle, and the air compressor is located in the fan nacelle;

[0007] A cooling pipeline is connected between the oil inlet and the oil outlet of the gear box, and a cooling system is provided on the cooling pipeline;

[0008] An oil supply bypass pipe is connected between the cooling pipeline at the oil outlet of the gear box and the oil inlet of the heat exchange chamber, and an oil return bypass pipe is connected between the cooling pipeline at the oil inlet of the gear box and the oil outlet of the heat exchange chamber, and an oil return bypass pipe is provided on the oil return bypass pipe;

[0009] The air inlet of the heat exchange chamber is connected to the air compressor, and the air outlet of the heat exchange chamber is connected to a heat supply pipe, which passes through the nacelle and is inserted into the inner cavity of the blade;

[0010] When the blades are heated, the oil outlet of the gear box, the oil supply bypass pipe, the heat exchange chamber, the oil return bypass pipe and the oil inlet of the gear box form a passage to bypass the cooling system.

[0011] Preferably, it also includes a temperature and humidity sensor, and the temperature and humidity sensor is located outside the cabin;

[0012] A first control valve is provided at the connection point between the oil return bypass pipe and the cooling pipeline, and a second control valve is provided at the connection point between the oil supply bypass pipe and the cooling pipeline;

[0013] The temperature and humidity sensor, the air compressor, the first control valve and the second control valve are all electrically connected to the fan control cabinet.

[0014] Preferably, it also includes an air flow meter, which is arranged at the air outlet of the heat exchange bin and is electrically connected to the fan control cabinet to feed back the real-time air flow rate after heat exchange.

[0015] A method for operating a fan blade anti-icing system, comprising:

[0016] The temperature and humidity of the fan's external environment are collected in real time through the temperature and humidity sensor, and it is determined whether the real-time value meets the preset temperature and humidity requirements for starting the air compressor;

[0017] If not, the air compressor will not start, the system will continue to be in a stopped state, continue to collect the temperature and humidity of the fan's external environment in real time, and continue to judge until it meets the requirements and starts the air compressor; if it meets the requirements, the air compressor will be started;

[0018] After the air compressor is started, the air velocity at the heat exchanger outlet is collected in real time through the air velocity meter for a certain period of time, and it is determined whether the values ​​during the collection period meet the air velocity requirements preset for system startup;

[0019] If at least one set of air flow rates does not meet the requirements, an alarm is sounded and the air compressor is shut down, and the first control valve and the second control valve are controlled so that the system does not run and the lubricating oil enters the cooling pipeline for cooling;

[0020] If the air flow rates of all groups meet the requirements, the air compressor works normally. By controlling the first control valve and the second control valve, a passage is formed among the gear box oil outlet, the oil supply bypass pipe, the heat exchange chamber, the return oil bypass pipe and the gear box oil inlet, so that the cooling pipeline is bypassed, and the lubricating oil in the gear box enters the heat exchanger to exchange heat with the air. The heated air enters the inner cavity of the blade through the heat supply pipe, and the system starts to run.

[0021] Preferably, after the air compressor is started for the first time, the air compressor is run for a certain period of time, and then the air flow rate data collected in real time by the air flow meter is used for a certain period of time to determine whether the values ​​during the collection period meet the air flow rate requirements preset by the system.

[0022] Preferably, after the temperature and humidity values ​​are determined, the air compressor is started for the first time, and the operation method after starting specifically includes:

[0023] The air velocity at the heat exchanger outlet is collected in real time by an air velocity meter for a certain period of time, and it is first determined whether the values ​​during the collection period meet the air velocity requirements preset for system startup;

[0024] If it is first determined that at least one group of air flow rates does not meet the requirements, the air compressor is first turned off, and then started at a certain interval. After running for a certain period of time, the air flow rate at the heat exchanger outlet is collected for a certain period of time through an air flow meter, and it is judged again whether the collected values ​​meet the air flow rate requirements preset by the system; if at least one group of air flow rates still does not meet the requirements, an alarm is issued and the air compressor is turned off, and the system does not run; if all groups of air flow rates meet the requirements, the air compressor works normally and the system runs;

[0025] If the air flow rate meets the requirements for the first time, the air compressor works normally and the system starts running.

[0026] Preferably, during the operation of the system, the operation method further comprises: collecting the temperature and humidity of the external environment of the fan in real time through a temperature and humidity sensor, and collecting the air flow rate at the air outlet of the heat exchanger in real time through an air flow meter, and judging whether the real-time temperature and humidity values ​​and the air flow rate meet the preset requirements for stopping the system;

[0027] If the air velocity, temperature and humidity do not meet the requirements, the system will operate normally;

[0028] If at least one of the air flow rate, temperature and humidity meets the requirements within a certain period of time, an alarm will be triggered, the air compressor will be shut down, and the system will stop running.

[0029] Preferably, the preset temperature and humidity requirements for starting the air compressor and the preset air flow rate requirements for starting the system include: a temperature value lower than 2°C, a humidity value greater than 75%RH, and an air flow rate greater than 3m / s;

[0030] When the system is running, the preset temperature and humidity requirements and air flow rate requirements for the system to stop include: temperature higher than 5°C, humidity less than 70%RH, and air flow rate less than 3m / s.

[0031] Preferably, the preset temperature and humidity requirements for starting the air compressor and the preset air flow rate requirements for starting the system include: a temperature value lower than 0°C, a humidity value greater than 80%RH, and an air flow rate greater than 3.5m / s;

[0032] When the system is running, the preset temperature and humidity requirements and air flow rate requirements for the system to stop include: temperature higher than 3°C, humidity less than 70%RH, and air flow rate less than 3.5m / s.

[0033] Preferably, it also includes:

[0034] After the icing season ends, the temperature and humidity sensor collects the ambient temperature outside the fan. If the temperature and humidity do not meet the preset temperature and humidity requirements for system startup within a certain period of time, the power supply circuits of the air compressor, temperature and humidity sensor, first control valve and second control valve will be cut off and the system will stop running.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The system uses the heat generated by the gearbox during the operation of the wind turbine as the heat source for deicing, which has lower energy consumption. Compared with the method of using electric heating as the heat source, it improves the safety and stability of the wind turbine during operation; and it does not modify the cooling system that the original gearbox should be equipped with, ensuring the normal operation of the original system; using air as the heating medium for the blades, the effect of heating the blades is better, and the heating modification cost of the blade cavity is saved.

[0037] 2. The system operation method uses the fan control cabinet to collect and process signals and perform system control, and uses the solenoid valve to control and switch the lubricating oil circulation loop, which can effectively improve the adaptability of the wind turbine to the natural environment and improve the reliability of the wind turbine operation in the icing season. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 It is a schematic diagram of the overall system of an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of a heat exchange chamber in an embodiment of the present invention;

[0041] Figure 3 A block diagram of a method for starting and operating a system in an embodiment of the present invention;

[0042] Figure 4 This is a block diagram of a method for running during system operation according to an embodiment of the present invention.

[0043] Description of reference numerals:

[0044] 1. Gearbox; 101. Oil inlet; 102. Oil outlet; 2. Heat exchange chamber; 3. Air compressor; 4. Cooling pipeline; 5. Cooling system; 6. Oil supply bypass pipe; 7. Oil return bypass pipe; 8. Oil return pump; 9. Heating pipe; 10. First control valve; 11. Second control valve; 12. Temperature and humidity sensor; 13. Air flow meter; 14. Fan control cabinet. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] like Figure 1-2As shown, an embodiment of the present invention provides an anti-icing system for fan blades, specifically comprising a gear box 1, a heat exchange chamber 2 and an air compressor 3, wherein the gear box 1 and the heat exchange chamber 2 are installed in a fan cabin, and the air compressor 3 is installed on the outer wall of the fan cabin, wherein the existing gear box 1 in the fan cabin is equipped with a cooling system 5, and the cooling system 5 includes an existing cooling box and an oil pump, and a cooling pipeline 4 is connected between the oil inlet 101 and the oil outlet 102 of the gear box 1, and the cooling system 5 is arranged on the cooling pipeline 4. In this embodiment, in order not to interfere with the normal operation of the original cooling system 5, an oil supply bypass pipe 6 is connected between the cooling pipeline 4 at the oil outlet 102 of the gear box 1 and the oil inlet 101 of the heat exchange chamber 2, and an oil return bypass pipe 7 is connected between the cooling pipeline 4 at the oil inlet 101 of the gear box 1 and the oil outlet 102 of the heat exchange chamber 2. A return oil pump 8 is provided on it, and correspondingly, the air inlet of the heat exchange chamber 2 is connected with the air compressor 3, and the air outlet of the heat exchange chamber 2 is connected with a heating pipe 9, which passes through the cabin and is inserted into the inner cavity of the blade; therefore, when the blades need to be heated in the icing season, it is only necessary to bypass the cooling system 5 on the cooling pipe 4, so that the oil outlet 102 of the gear box 1, the oil supply bypass pipe 6, the heat exchange chamber 2, the return oil bypass pipe 7 and the oil inlet 101 of the gear box 1 form a passage, so that the hot oil in the gear box 1 will enter the oil circuit in the heat exchanger through the return oil bypass pipe 7 under the action of the return oil pump 8, and at the same time start the air compressor 3, the air compressor 3 supplies outside air into the heat exchanger, heat exchange occurs with the hot oil, the air is heated, and the heated air finally enters the inner cavity of the blade through the heating pipe 9, and continuously heats the blade in the inner cavity of the blade to prevent the surface of the blade from freezing, and finally is discharged through the exhaust hole of the blade. When the blades are not covered with ice, the lubricating oil continues to flow in cooling pipe 4 (original pipe), which does not affect the normal cooling of the lubricating oil.

[0049] The blade anti-icing system composed of the gear box 1, the heat exchange chamber 2, the air compressor 3, the oil supply bypass pipe 6, the oil return bypass pipe 7 and the oil return pump 8 can use an external heat exchanger to replace the original cooling system 5 to cool the gear box 1 lubricating oil during the icing season. It has lower energy consumption and is safer than the method of using electric heating as a heat source. Moreover, the design of this system will not modify the cooling system 5 that the original gear box 1 should be equipped with. Moreover, the lubricating oil exchanges heat with the air in the heat exchanger to heat the air to further heat the blades, so that the blades are anti-icing. Using air as the medium for heating the blades does not require additional pipeline settings. It is only necessary to insert the heating pipe 9 into the inner cavity of the blade. Moreover, the air can quickly diffuse in the inner cavity of the blade and run to the inner wall of the blade, and flow to the exhaust hole of the blade along the inner wall of the blade, so that the effect of heating the blade is better and the modification cost is saved.

[0050] Specifically, the system also includes a temperature and humidity sensor 12, wherein the temperature and humidity sensor 12 is located outside the cabin. In order to facilitate the control of the pipeline, a first control valve 10 is provided at the connection point between the return oil bypass pipe 7 and the cooling pipeline 4, and a second control valve 11 is provided at the connection point between the oil supply bypass pipe 6 and the cooling pipeline 4. The above-mentioned temperature and humidity sensor, air compressor 3, first control valve 10 and second control valve 11 are all electrically connected to the fan control cabinet 14, and the fan control cabinet 14 controls the start and shut down of the air compressor, the first control valve 10 and the second control valve 11 according to the temperature and humidity values ​​collected by the temperature and humidity sensor 12. Specifically, the first control valve 10 and the second control valve 11 are both three-way solenoid valves.

[0051] Specifically, the system also includes an air flow meter 13, which is installed at the air outlet of the heat exchange chamber 2 and is used to measure the air flow rate at the air outlet of the heat exchange chamber 2. The air flow meter 13 is electrically connected to the fan control cabinet 14, and the measured air flow rate value is fed back to the fan control cabinet 14, so as to control the start and close of the air compressor, the first control valve 10 and the second control valve 11 again according to the air flow rate value.

[0052] Specifically, the heating pipe 9 includes a straight pipe section and a distribution pipe. The straight pipe section enters the main shaft from the nacelle through the gear box 1 threading tube, and passes through the main shaft threading hole to enter the wind turbine hub. The heating pipe 9 is connected to the distribution pipe through a rotating sealing joint. The distribution pipe is divided into a three-way pipe and enters the inner cavity of the three blades of the wind turbine.

[0053] This embodiment also discloses an operation method based on the above-mentioned fan blade anti-icing system, such as Figure 3 As shown, specifically including:

[0054] First, the temperature and humidity of the external environment of the fan is collected in real time through the temperature and humidity sensor 12, and sent back to the fan control cabinet 14. The fan control cabinet 14 determines whether the temperature and humidity values ​​meet the temperature and humidity requirements preset for system startup. There are two judgment results: if not, the air compressor 3 will not start, and the system will continue to be in a stopped state. The temperature and humidity sensor 12 continues to collect the temperature and humidity of the external environment of the fan in real time, and then sends it back to the fan control cabinet 14, and continues to judge until the value meets the requirements, and then starts the air compressor 3; if it directly meets the requirements, the air compressor 3 is directly started. The value here refers to meeting the requirements, which means that as long as any set of measured temperature and humidity values ​​meet the requirements, the air compressor 3 will be started.

[0055] After the air compressor 3 is started, the air flow rate at the heat exchanger outlet is collected by the air flow meter 13 for a certain period of time (1-3 minutes), and then sent back to the fan control cabinet 14. The fan control cabinet 14 determines whether the air flow rate values ​​during the collection period meet the air flow rate requirements preset by the system. There are two final judgment results: if at least one group of air flow rates does not meet the requirements, an alarm is issued and the air compressor 3 is shut down, and the first control valve 10 and the second control valve 11 are controlled so that the system does not run, and the lubricating oil flows through the original pipeline and enters the cooling pipeline 4 for cooling; if all groups of air flow rates meet the requirements, the air compressor 3 works normally, and the first control valve 10 and the second control valve 11 are controlled to form a passage through the gear box 1 oil outlet 102, the oil supply bypass pipe 6, the heat exchange chamber 2, the return oil bypass pipe 7 and the gear box 1 oil inlet 101, so that the cooling pipeline 4 is bypassed, and the lubricating oil in the gear box 1 enters the heat exchanger to exchange heat with the air, and the heated air enters the blade cavity through the heat supply pipe 9, and the system starts to run.

[0056] The above-mentioned operating method first uses the outside temperature and humidity as the judgment standard for the initial start-up of the air compressor 3, so that the system can operate in an environment where the blades can be covered with ice, adapt to the environment, and avoid ineffective operation of the system caused by environmental incompatibility; secondly, after the air compressor 3 is started, the air flow rate through the air outlet of the heat exchanger is used as the judgment standard for the start-up of the entire system to ensure that the air flow rate after heat exchange can meet the anti-icing requirements of the blades after entering the inner cavity of the blades. Otherwise, if the air flow rate is too low and it is still started, insufficient heat may enter the inner cavity of the blades, resulting in ice still forming on the blades. In addition, the air flow rate is too low, so that the fan control cabinet 14 can promptly alarm the outside world, and the maintenance personnel can promptly perform maintenance to restore it to its normal operating state, to ensure that sufficient heat can be provided to the inner cavity of the blades during subsequent system operation to prevent the blades from being covered with ice.

[0057] The air flow rate at the air outlet of the heat exchanger fails to meet the requirement, which may be due to a problem with the air compressor 3 itself, or due to oil leakage inside the heat exchanger, or blockage by obstacles, etc.

[0058] Specifically, after the fan control cabinet 14 uses the external temperature and humidity as the standard for judgment, the air compressor 3 is started for the first time. First, the air compressor 3 must be run for a certain period of time (3-5 minutes) to make it in normal working condition, and then the air flow rate data collected by the air flow meter 13 is used to judge whether this value meets the air flow rate requirement preset by the system, so as to avoid the situation where the air flow rate does not reach the normal value when the air compressor 3 is started, and the fan control cabinet 14 makes a judgment based on the value measured by the air flow meter 13, which causes the entire system to fail to operate and an alarm to occur.

[0059] Specifically, after the fan control cabinet 14 has judged the above temperature and humidity values, the air compressor 3 meets the startup requirements, and the air compressor 3 is started for the first time. The operation method after startup specifically includes:

[0060] The air velocity meter 13 collects the air velocity at the air outlet of the heat exchanger for a certain period of time (1-3 minutes) and transmits it back to the fan control cabinet 14. The fan control cabinet 14 first determines whether the air velocity values ​​during the collection period meet the air velocity requirements preset by the system. There are two judgment results: if it is first determined that at least one group of air velocity does not meet the requirements, the air compressor 3 is first turned off, and then started at a certain interval (3-5 minutes). After starting for a certain period of time (3-5 minutes), the air velocity meter 13 is used to collect the air velocity at the air outlet of the heat exchanger for a certain period of time (1-3 minutes), and it is judged again whether the values ​​during the collection period meet the air velocity requirements preset by the system; if at least one group of air velocity still does not meet the requirements, the fan control cabinet 14 directly controls the alarm system to alarm and shut down the air compressor 3, and the system does not run; if all groups of air velocity meet the requirements, the air compressor 3 works normally and the system runs. If it is first determined that the air velocity meets the requirements, the air compressor 3 works normally and the system runs. The above operation method allows the air compressor 3 to be buffered once, avoiding the air compressor 3 from being damaged or requiring maintenance due to insufficient wind speed caused by internal blockage or circuit contact, etc., which causes the fan control cabinet 14 to misjudge that the air compressor 3 is damaged or needs maintenance, so that the fan maintenance personnel need to spend time to maintain it, which is time-consuming and laborious. The startup time and operation time of the above air compressor 3 can be adjusted, and the specific design is based on the specific situation.

[0061] Specifically, during system operation, Figure 4 As shown, the operation method also includes: collecting the temperature and humidity of the external environment of the fan in real time through the temperature and humidity sensor 12 to obtain the real-time temperature and humidity, and collecting the air flow rate at the air outlet of the heat exchanger in real time through the air flow meter 13 to obtain the real-time air flow rate, and the fan control cabinet 14 continuously judges whether the real-time values ​​of temperature and humidity and air flow rate meet the preset temperature and humidity and air flow rate requirements for system stop. There are two judgment results: if the air flow rate and temperature and humidity do not meet the requirements all the time, that is, any set of real-time data of the air flow rate and temperature and humidity do not meet the requirements, then the system operates normally; if at least one of the air flow rate, temperature and humidity meets the requirements within a certain period of time (5-10 minutes), the fan control cabinet 14 controls the alarm system to alarm, and shuts down the air compressor 3, the entire system stops running, and the lubricating oil runs according to the crude oil route, that is, during the operation of the system, as long as at least one of the two items of air flow rate value and temperature and humidity value is measured within any continuous period of time, all groups of values ​​meet the system stop requirements, then the system stops.

[0062] In this embodiment, the preset temperature and humidity requirements for starting the air compressor 3 and the preset air flow rate requirements for starting the system include: the temperature value is lower than 2°C, the humidity value is greater than 75%RH, and the air flow rate is greater than 3m / s. Specifically, when the temperature value measured by the temperature and humidity sensor 12 is less than 2°C and the humidity value is greater than 75%RH, the external environment may cause ice to be coated on the blade surface. At this time, the air compressor 3 is started. If the temperature value is greater than 2°C and the humidity value is less than 75%RH, it will not be started until the temperature and humidity meet the above requirements. Correspondingly, after the air compressor 3 is started, when the air flow meter 13 measures that the air flow rate is greater than 3m / s for a certain period of time, the fan control cabinet 14 controls the first control valve 10 and the second control valve 11, so that the oil outlet 102 of the gear box 1, the oil supply bypass pipe 6, the heat exchange chamber 2, the return oil bypass pipe 7 and the oil inlet 101 of the gear box 1 form a passage, so that the cooling pipeline 4 is bypassed, and the entire system is started to perform the blade anti-icing operation.

[0063] Correspondingly, during the operation of the system, the preset temperature and humidity requirements and air flow rate requirements for the system to stop include: temperature greater than 5°C, humidity less than 70%RH, and air flow rate less than 3m / s. Specifically, when the temperature values ​​measured by the temperature and humidity sensor 12 are greater than 5°C and the humidity values ​​are less than 70%RH within a certain period of time, the external environment will not cause ice to form on the blade surface, and / or the air flow rate measured by the air flow meter 13 is less than 3m / s within a certain period of time, the air compressor 3 is turned off, and the fan control cabinet 14 controls the first control valve 10 and the second control valve 11, so that the oil outlet 102 of the gear box 1, the oil supply bypass pipe 6, the heat exchange chamber 2, the return oil bypass pipe 7 and the oil inlet 101 of the gear box 1 are disconnected, so that the cooling pipeline 4 is normally connected, and the entire system stops running.

[0064] In another embodiment, the preset temperature and humidity requirements for starting the air compressor 3 and the preset air flow rate requirements for starting the system include: the temperature value is lower than 0°C, the humidity value is greater than 80%RH, and the air flow rate is greater than 3.5m / s. During the operation of the system, the preset temperature and humidity requirements and air flow rate requirements for stopping the system include: the temperature is higher than 3°C, the humidity is less than 70%RH, and the air flow rate is less than 3.5m / s. The specific control method will not be repeated, and it is the same as above.

[0065] In another embodiment, the preset temperature and humidity requirements for starting the air compressor 3 and the preset air flow rate requirements for starting the system include: the temperature value is lower than 0°C, the humidity value is greater than 85%RH, and the air flow rate is greater than 4m / s. During the operation of the system, the preset temperature and humidity requirements and air flow rate requirements for stopping the system include: the temperature is higher than 3°C, the humidity is less than 75%RH, and the air flow rate is less than 4m / s. The specific control method will not be repeated, and it is the same as above.

[0066] Specifically, the system operation method also includes: after the ice season ends, the temperature and humidity sensor 12 collects the ambient temperature outside the fan. If the temperature and humidity do not meet the preset temperature and humidity requirements for system startup within a certain period of time (1-2 days), the power supply circuits of the air compressor 3, the temperature and humidity sensor 12, the first control valve 10 and the second control valve 11 are cut off, and the system stops running. This avoids problems such as damage to the lubricating oil system of the gear box 1 and oil leakage caused by system malfunction and other factors.

[0067] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A fan blade anti-icing system, characterized in that: It includes a gear box, a heat exchange chamber and an air compressor, wherein the gear box and the heat exchange chamber are located in the fan cabin, and the air compressor is located in the fan cabin; A cooling pipeline is connected between the oil inlet and the oil outlet of the gear box, and a cooling system is provided on the cooling pipeline; An oil supply bypass pipe is connected between the cooling pipeline at the oil outlet of the gear box and the oil inlet of the heat exchange chamber, and an oil return bypass pipe is connected between the cooling pipeline at the oil inlet of the gear box and the oil outlet of the heat exchange chamber, and an oil return bypass pipe is provided on the oil return bypass pipe; The air inlet of the heat exchange chamber is connected to the air compressor, and the air outlet of the heat exchange chamber is connected to a heat supply pipe, which passes through the nacelle and is inserted into the inner cavity of the blade; When the blades are heated, the gearbox oil outlet, the oil supply bypass pipe, the heat exchange chamber, the oil return bypass pipe and the gearbox oil inlet form a passage to bypass the cooling system.

2. The anti-icing system according to claim 1, characterized in that: Also included is a temperature and humidity sensor, which is located outside the cabin; A first control valve is provided at the connection point between the oil return bypass pipe and the cooling pipeline, and a second control valve is provided at the connection point between the oil supply bypass pipe and the cooling pipeline; The temperature and humidity sensor, the air compressor, the first control valve and the second control valve are all electrically connected to the fan control cabinet.

3. The anti-icing system according to claim 2, characterized in that: It also includes an air flow meter, which is arranged at the air outlet of the heat exchange bin and is electrically connected to the fan control cabinet to feed back the real-time air flow rate after heat exchange.

4. An operating method of the anti-icing system according to claim 3, characterized in that: include: The temperature and humidity of the fan's external environment are collected in real time through the temperature and humidity sensor, and it is determined whether the real-time value meets the preset temperature and humidity requirements for starting the air compressor; If it does not meet the requirements, the air compressor will not start, the system will continue to be in a stopped state, and continue to collect the temperature and humidity of the fan's external environment in real time, and continue to judge until it meets the requirements and starts the air compressor; If it meets the requirements, start the air compressor; After the air compressor is started, the air velocity at the heat exchanger outlet is collected in real time through the air velocity meter for a certain period of time, and it is determined whether the values ​​during the collection period meet the air velocity requirements preset for system startup; If at least one set of air flow rates does not meet the requirements, an alarm is sounded and the air compressor is shut down, and the first control valve and the second control valve are controlled so that the system does not run and the lubricating oil enters the cooling pipeline for cooling; If the air flow rates of all groups meet the requirements, the air compressor works normally. By controlling the first control valve and the second control valve, a passage is formed among the gear box oil outlet, the oil supply bypass pipe, the heat exchange chamber, the return oil bypass pipe and the gear box oil inlet, so that the cooling pipeline is bypassed, and the lubricating oil in the gear box enters the heat exchanger to exchange heat with the air. The heated air enters the inner cavity of the blade through the heat supply pipe, and the system starts to run.

5. The operating method of the anti-icing system according to claim 4, characterized in that: After the air compressor is started for the first time, the air compressor is run for a certain period of time, and then the air flow rate data collected in real time by the air flow meter is judged for a certain period of time to determine whether the values ​​during the collection period meet the air flow rate requirements preset by the system.

6. The operating method of the anti-icing system according to claim 5, characterized in that: After the temperature and humidity values ​​are determined, the air compressor is started for the first time. The specific operation methods after startup include: The air velocity at the heat exchanger outlet is collected in real time by an air velocity meter for a certain period of time, and it is first determined whether the values ​​during the collection period meet the air velocity requirements preset for system startup; If it is first determined that at least one group of air flow rates does not meet the requirements, the air compressor is first turned off, and then started after a certain interval. After running for a certain period of time, the air flow rate at the heat exchanger outlet is collected for a certain period of time through the air flow meter, and it is judged again whether the collected values ​​meet the air flow rate requirements preset by the system; if at least one group of air flow rates still does not meet the requirements, an alarm is issued and the air compressor is turned off, and the system does not run; if all groups of air flow rates meet the requirements, the air compressor works normally and the system runs; If the air flow rate meets the requirements for the first time, the air compressor works normally and the system starts running.

7. The operating method of the anti-icing system according to claim 6, characterized in that: During the operation of the system, the operation method further includes: collecting the temperature and humidity of the external environment of the fan in real time through the temperature and humidity sensor, and collecting the air flow rate at the air outlet of the heat exchanger in real time through the air flow meter, and judging whether the real-time temperature and humidity values ​​and the air flow rate meet the preset requirements for stopping the system; If the air velocity, temperature and humidity do not meet the requirements, the system will operate normally; If at least one of the air flow rate, temperature and humidity meets the requirements within a certain period of time, an alarm will be triggered, the air compressor will be shut down, and the system will stop running.

8. The operating method of the anti-icing system according to claim 7, characterized in that: The preset temperature and humidity requirements for air compressor startup and the preset air flow rate requirements for system startup include: temperature value lower than 2°C, humidity value greater than 75%RH, air flow rate greater than 3m / s; When the system is running, the preset temperature and humidity requirements and air flow rate requirements for the system to stop include: temperature higher than 5°C, humidity less than 70%RH, and air flow rate less than 2.8m / s.

9. The operating method of the anti-icing system according to claim 7, characterized in that: The preset temperature and humidity requirements for air compressor startup and the preset air flow rate requirements for system startup include: temperature value lower than 0°C, humidity value greater than 80%RH, and air flow rate greater than 3m / s; When the system is running, the preset temperature and humidity requirements and air flow rate requirements for the system to stop include: temperature higher than 3°C, humidity less than 70%RH, and air flow rate less than 2.8m / s.

10. The operating method of the anti-icing system according to claim 4, characterized in that: Also includes: After the icing season ends, the temperature and humidity sensor collects the ambient temperature outside the fan. If the temperature and humidity do not meet the preset temperature and humidity requirements for system startup within a certain period of time, the power supply circuits of the air compressor, temperature and humidity sensor, first control valve and second control valve will be cut off and the system will stop running.

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