An anti-icing protection device for a wind turbine icing monitoring camera

Abstract

The present invention discloses an anti-icing protection device for a camera for monitoring ice coverage of a wind turbine, and belongs to the technical field of wind power generation. The present invention is used to protect a camera set on a tower to monitor the ice coverage of blades. The camera is connected to a computer, and the anti-icing protection device includes a thermal airflow system and a spherical shield; the spherical shield includes an outer shield, an inner shield and a bottom plate, the bottom plate is fixedly connected to the tower, the outer shield and the inner shield are connected to the bottom plate and are arranged outside the camera; an air outlet and a plurality of air inlets are arranged on the bottom plate between the outer shield and the inner shield, and the plurality of air inlets are connected to the thermal airflow system. The overall structure of the present invention is relatively simple, and the space occupied inside the tower is small, so it does not affect the normal operation of the wind turbine and the normal operation of other equipment inside the tower; it can effectively solve the ice coverage on the camera protective cover in icy weather, ensure the normal monitoring function of the video device, and has good application prospects.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power generation, and in particular relates to an anti-icing protection device for an icing monitoring camera of a wind turbine generator set. Background Art

[0002] In wind farms in low wind speed areas and some high wind speed areas in the south, there is a common problem of freezing in winter and spring. The ice monitoring device / system detects the ice condition on the surface of the wind turbine blades and provides start and stop signals for the wind turbine blade gas heating, electric heating or other anti-icing devices. Video / image ice detection methods have received much attention and application. Among them, the ice detection system based on the image method uses a fixed video device to continuously shoot the detected blades and analyze the images. The image method is relatively simple and easy to use, and the monitoring response to the ice condition is more intuitive.

[0003] In fact, when the meteorological conditions in which the wind turbine is located induce ice, ice will form on the wind turbine blades to varying degrees, that is, the video device may fail to monitor in a harsh environment due to the equipment (especially the camera) being covered with ice and snow. In order to protect the camera, the conventional practice is to install a circular cover in front of the camera, but this measure cannot effectively solve the failure of the blade ice detection function caused by ice and snow. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide an anti-icing protection device for a wind turbine icing monitoring camera, which can effectively solve the ice on the camera protection cover in icy weather and ensure the normal monitoring function of the video device.

[0005] The present invention is achieved through the following technical solutions:

[0006] The present invention discloses an anti-icing protection device for a wind turbine icing monitoring camera, which is used to protect a camera arranged on a tower to monitor blade icing conditions, wherein the camera is connected to a computer, and is characterized in that the anti-icing protection device comprises a thermal airflow system and a spherical shield;

[0007] The spherical shield includes an outer shield, an inner shield and a base plate. The base plate is fixedly connected to the tower. The outer shield and the inner shield are connected to the base plate and are arranged outside the camera. An air outlet and a plurality of air inlets are arranged on the base plate between the outer shield and the inner shield. The plurality of air inlets are connected to the thermal air flow system.

[0008] Preferably, a supporting platform is provided in the tower, and the hot air flow system includes a power supply, a heating chamber, a blower and a circuit control unit arranged on the supporting platform. A resistance wire is provided inside the heating chamber, the power supply is connected to the circuit control unit, the circuit control unit is respectively connected to the resistance wire and the blower, the blower is connected to the air inlet of the heating chamber, and the air outlet of the heating chamber is connected to several air inlets through an air supply pipe.

[0009] Further preferably, the power source is a battery, the power source is connected to a plurality of photovoltaic panels, and the plurality of photovoltaic panels are arranged on the outer wall of the tower.

[0010] Further preferably, an air mixing chamber is provided between the air supply pipe and the plurality of air inlets, the inner wall of the air mixing chamber is a smooth curved surface, an air inlet is provided on one side of the air mixing chamber, and a plurality of air outlets are provided on the other side, the air inlet is connected to the air supply pipe, and the plurality of air outlets are respectively connected to the plurality of air inlets.

[0011] Preferably, a plurality of air inlets are arranged at the upper portion of the bottom plate, and an air outlet is arranged at the lower portion of the bottom plate.

[0012] Further preferably, the plurality of air inlets are distributed at equal angles, the centers of the plurality of air inlets are distributed on a distribution arc, the midpoint of the distribution arc is located at the highest point of the bottom plate, and the air outlet is located at the lowest point of the bottom plate.

[0013] Preferably, the cross-sectional area of ​​the air outlet does not exceed the sum of the cross-sectional areas of the plurality of air inlets.

[0014] Preferably, the outer shield and the inner shield are quartz glass shields.

[0015] Preferably, a first temperature measuring device is provided at the air inlet, and a second temperature measuring device is provided under the spherical shield outside the tower, the first temperature measuring device and the second temperature measuring device are connected to a computer, and the computer is connected to the thermal airflow system.

[0016] Preferably, the connecting pipes in the hot air flow system are all made of silicone tubes.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects:

[0018] The present invention discloses an anti-icing protection device for a wind turbine blade icing monitoring camera. The hot air flow generated by the hot air flow system flows between the outer shield and the inner shield, along a plurality of air inlets to the air outlet, and realizes uniform heat exchange inside the spherical shield and on the wall surface, which can effectively prevent or melt the icing of the outer shield of the spherical shield, and ensure the normal monitoring of the icing of the wind turbine blades by the camera system. The overall structure of the present invention is relatively simple, and the space occupied inside the tower is small, which does not affect the normal operation of the wind turbine and the normal operation of other equipment inside the tower, and has good application prospects.

[0019] Furthermore, the thermal airflow system has a simple structure and is easy to construct; it is centrally arranged on a supporting platform, which is convenient for installation and maintenance.

[0020] Furthermore, the power source uses batteries, and the power is supplied by photovoltaic panels installed on the outer wall of the tower. It can fully convert the sunlight that shines on the tower every day to achieve continuous charging of the batteries. Moreover, the system is independent of the circuit of the wind turbine set, has high reliability, and has little impact on the wind turbine itself.

[0021] Furthermore, an air mixing chamber is provided between the air supply pipe and the plurality of air inlets, so that the hot air flow can be buffered and evenly enter each air inlet.

[0022] Furthermore, the cross-sectional area of ​​the air outlet does not exceed the sum of the cross-sectional areas of the plurality of air inlets, thereby reducing the resistance of the hot air flow in the interlayer space between the outer protective cover and the inner protective cover.

[0023] Furthermore, the outer protective cover and the inner protective cover are quartz glass covers, which have good light transmittance and high hardness, and can better protect the camera.

[0024] Furthermore, by providing the first temperature measuring device and the second temperature measuring device, the working parameters of the thermal airflow system can be reasonably controlled according to the external ambient temperature, with a high degree of automation and energy saving.

[0025] Furthermore, the connecting pipes in the hot air flow system are all made of silicone tubes, which have good heat resistance and anti-aging properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 A schematic diagram of a wind turbine blade icing condition monitoring system based on image recognition in the prior art;

[0028] Figure 3 It is a front view of the spherical shield;

[0029] Figure 4 A top view of the photovoltaic panels arranged on the outer wall of the tower.

[0030] In the figure: 1. tower; 2. blades; 3. camera; 4. computer; 5. cable; 6. outer shield; 7. inner shield; 8. air inlet; 9. air outlet; 10. support platform; 11. photovoltaic panel; 12. power supply; 13. heating chamber; 14. resistance wire; 15. blower; 16. circuit control unit; 17. first temperature measuring device; 18. second temperature measuring device; 19. spherical shield; 20. bottom plate; 21. air supply pipe. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, the contents of which are intended to explain the present invention rather than to limit it:

[0032] like Figure 2 At present, a camera 3 for monitoring the ice condition on the blades 2 is installed at a specific height of the tower 1 of the wind turbine generator set. The image captured by the camera 3 is connected to a computer 4 placed at the bottom of the tower through a cable 5. The computer 4 is installed with a driver and control software for the camera 3. The images captured by the camera 3 at a certain frequency (such as 1 to 2 images / minute) are transmitted to the computer 4 for storage. The operator can remotely control the computer 4 and process, compare and analyze the images based on the ice recognition algorithm, so as to judge the ice condition of the blades and start / stop the anti-icing system of the blades.

[0033] The anti-icing protection device for the wind turbine icing monitoring camera of the present invention is used to protect the camera 3 set on the tower 1 to monitor the icing condition of the blade 2, the camera 3 is connected to the computer 4, and the anti-icing protection device includes a thermal airflow system and a spherical shield 19; the spherical shield 19 includes an outer shield 6, an inner shield 7 and a bottom plate 20, the bottom plate 20 is fixedly connected to the tower 1, the outer shield 6 and the inner shield 7 are connected to the bottom plate 20 and are arranged outside the camera 3; an air outlet 9 and a plurality of air inlets 8 are provided on the bottom plate 20 between the outer shield 6 and the inner shield 7, and the plurality of air inlets 8 are connected to the thermal airflow system.

[0034] In a preferred embodiment of the present invention, a support platform 10 is provided in the tower 1, and the hot air flow system includes a power supply 12, a heating chamber 13, a blower 15 and a circuit control unit 16 provided on the support platform 10. A resistance wire 14 is provided inside the heating chamber 13, the power supply 12 is connected to the circuit control unit 16, the circuit control unit 16 is connected to the resistance wire 14 and the blower 15 respectively, the blower 15 is connected to the air inlet of the heating chamber 13, and the air outlet of the heating chamber 13 is connected to a plurality of air inlets 8 through an air supply pipe 21. Preferably, the power supply 12 is a battery, and the power supply 12 is connected to a plurality of photovoltaic panels 11, and the plurality of photovoltaic panels 11 are provided on the outer wall of the tower 1. Preferably, an air mixing chamber is provided between the air supply pipe 21 and the plurality of air inlets 8, the inner wall of the air mixing chamber is a smooth curved surface, an air inlet is provided on one side of the air mixing chamber, and a plurality of air outlets are provided on the other side, the air inlet is connected to the air supply pipe 21, and the plurality of air outlets are respectively connected to the plurality of air inlets 8.

[0035] In a preferred embodiment of the present invention, a plurality of air inlets 8 are provided on the upper portion of the bottom plate 20, and an air outlet 9 is provided on the lower portion of the bottom plate 20. Preferably, the plurality of air inlets 8 are distributed at equal angles, the centers of the plurality of air inlets 8 are distributed on a distribution arc, and the midpoint of the distribution arc is located at the highest point of the bottom plate 20, and the air outlet 9 is located at the lowest point of the bottom plate 20.

[0036] In a preferred embodiment of the present invention, the cross-sectional area of ​​the air outlet 9 does not exceed the sum of the cross-sectional areas of the plurality of air inlets 8 .

[0037] In a preferred embodiment of the present invention, the outer shield 6 and the inner shield 7 are quartz glass shields.

[0038] In a preferred embodiment of the present invention, a first temperature measuring device 17 is provided at the air inlet 8, and a second temperature measuring device 18 is provided under the spherical shield 19 outside the tower 1. The first temperature measuring device 17 and the second temperature measuring device 18 are connected to a computer 4, and the computer 4 is connected to the thermal airflow system.

[0039] In a preferred embodiment of the present invention, the connecting pipes in the hot air flow system are all made of silicone tubes.

[0040] The following is a specific embodiment:

[0041] like Figure 1 A support platform 10 is set at a suitable position inside the tower 1 near the camera 3, and a power supply 12, a small blower 15 and a heating chamber 13 are arranged on the support platform 10, wherein the power supply 12 adopts a battery, and the heating chamber 13 adopts a heat-resistant glass tube, and a resistance wire 14 is fixedly arranged inside the heat-resistant glass tube placed on the support platform 10.

[0042] A hemispherical spherical shield 19 with a certain diameter (e.g., 30 to 40 cm) is fixedly installed outside the camera 3. The spherical shield 19 is formed by connecting an outer shield 6, an inner shield 7, and a bottom plate 20, and an air layer is inside. The material of the spherical shield 19 can be selected from quartz glass with good light transmittance and high hardness to better protect the camera 3 and achieve the anti-icing function. Due to the conical shape of the tower 1 itself, the spherical shield 19 is not strictly hemispherical, and its bottom plate 20 should be processed into a shape that can fit tightly with the tower 1.

[0043] Combination Figure 3 , five air inlets 8 and one air outlet 9 are respectively arranged at the upper and lower ends of the bottom plate 20. The air outlet 9 is located at the lowest point in the height direction, while the middle air inlet 8 is located at the highest point in the height direction. The five air inlets 8 are arranged at equal intervals along the circumferential direction, and the center angle of two adjacent air inlets is 30°, that is, the total center angle of the five air inlets 8 is 120°. The arrangement design of the five air inlets 8 can ensure that hot air enters the spherical shield 19 from multiple locations, that is, flows through most of the internal space of the spherical shield 19, and has a relatively uniform heating effect on the entire spherical shield 19.

[0044] Since the ice on the outer surface of the spherical shield 19 is not as serious as that on the surface of the blade 2, in fact, the hot air inside the spherical shield 19 can smoothly pass through the heat conduction of the outer shield 6 and melt the ice on its surface without a large flow rate under the premise of continuous circulation. Therefore, the diameter of the air inlet 8 can be selected to be a smaller value (such as 2 to 3 cm), and the cross-sectional area of ​​the air outlet 9 is the sum of the cross-sectional areas of the five air inlets 8. The design of the diameter of the air inlet 8 and the air outlet 9 allows the hot air to flow smoothly inside the spherical shield 19 with low resistance.

[0045] Since the resistance wire 14 is fixedly installed inside the heat-resistant glass tube placed on the support platform 10, its diameter can be selected to be appropriately larger, and the material can be selected to be heat-resistant glass. Multiple sections of resistance wire 14 are connected in parallel inside and fixed in the tube (not in contact with the tube wall). The air inlet 8, the heat-resistant glass tube and the blower 15 are connected in sequence with a silicone tube to form an air circulation duct. The blower 15 extracts air from the inside of the tower 1 and sends it into the heat-resistant glass tube for heating and sends the hot air into the spherical shield 19. The hot air flows slowly in the spherical shield 19 and heats the glass material of the spherical shield 19. The temperature of the entire spherical shield 19 is maintained at 20-30°C, which can smoothly realize the anti-icing of the spherical shield 19, prevent the cold and wet air between the spherical shield 19 and the camera 3 from freezing, and does not affect the normal operation of the camera 3.

[0046] like Figure 4 As shown, an indefinite number of photovoltaic panels 11 can be evenly arranged along the circumferential direction on the outer wall of the tower 1, and each photovoltaic panel 11 is connected with a wire, and the wire is fixed closely to the outer wall of the tower 1. The output electrodes of the photovoltaic panel 11 are connected to the charging electrodes of the battery through the tower 1 through the wire. The capacity of the photovoltaic panel 11 is appropriately selected (such as a relatively small power generation level). Basically, the tower 1 will receive sunlight to varying degrees during the normal operation of the wind turbine, and its output current directly charges the battery.

[0047] The power transmission electrodes of the battery are connected to the resistance wire 14 and the blower 15 respectively through a circuit control unit 16, that is, the operation of the system of the present invention is powered only by the battery. The circuit control unit 16 is connected to the computer 4 placed at the bottom of the tower 1. The operator can remotely control the computer 4 and operate the circuit control unit 16. The circuit control unit 16 has the following functions:

[0048] 1) The start or stop of the resistance wire 14 and the blower 15 can be controlled respectively;

[0049] 2) The heating current of the resistance wire 14 can be adjusted;

[0050] 3) The ventilation volume of the blower 15 can be adjusted;

[0051] In order to reasonably control the power of the resistance wire 14 and the ventilation volume of the blower 15, a first temperature measuring device 17 is installed on the air inlet 8. The top of the first temperature measuring device 17 is inserted into the air inlet 8 to measure the temperature of the hot air pumped into the spherical shield 19. Similarly, a second temperature measuring device 18 is arranged at a suitable position below the tower 1 near the spherical shield 19 to measure the ambient temperature. The first temperature measuring device 17 and the second temperature measuring device 18 are respectively connected to the computer 4, and a thermocouple data collector is integrated in the computer 4. Finally, the temperatures measured by the two thermocouples can be directly displayed on the computer 4. Through the operation of the circuit control unit 16 by the computer 4, the measured temperature of the first temperature measuring device 17 is 20 to 30°C higher than the measured temperature of the second temperature measuring device 18. The measured temperature value provides a direct reference for the operator to optimize the system operation parameters through the computer 4.

[0052] By adjusting the operating current of the resistor 14 and the blower 15, the temperature and flow of the hot air are adjusted to meet the anti-icing requirements of the spherical shield 19 under different environmental meteorological conditions. The system can also operate without ice formation and operate at night to consume the energy stored in the battery and avoid overcharging of the battery after it is fully charged.

[0053] The above is only part of the embodiments of the present invention. Although some terms are used in the present invention, the possibility of using other terms is not excluded. The use of these terms is only for the convenience of describing and explaining the essence of the present invention. It is contrary to the spirit of the present invention to interpret them as any additional restrictions. The above is only to further illustrate the content of the present invention with examples for easier understanding, but it does not mean that the embodiments of the present invention are limited to this. Any technical extension or re-creation made according to the present invention is protected by the present invention.

Claims

1. An anti-icing protection device for a wind turbine generator set icing monitoring camera, used to protect a camera (3) arranged on a tower (1) for monitoring the icing condition of blades (2), the camera (3) being connected to a computer (4), characterized in that: The anti-icing protection device comprises a thermal airflow system and a spherical shield (19); The spherical shield (19) comprises an outer shield (6), an inner shield (7) and a bottom plate (20), the bottom plate (20) being fixedly connected to the tower (1), the outer shield (6) and the inner shield (7) being connected to the bottom plate (20) and being arranged outside the camera (3); an air outlet (9) and a plurality of air inlets (8) are arranged on the bottom plate (20) between the outer shield (6) and the inner shield (7), and the plurality of air inlets (8) are connected to a thermal air flow system; The tower (1) is provided with a support platform (10), and the hot air flow system comprises a power supply (12) arranged on the support platform (10), a heating chamber (13), a blower (15) and a circuit control unit (16). A resistance wire (14) is provided inside the heating chamber (13), the power supply (12) is connected to the circuit control unit (16), the circuit control unit (16) is respectively connected to the resistance wire (14) and the blower (15), the blower (15) is connected to the air inlet of the heating chamber (13), the air outlet of the heating chamber (13) is connected to a plurality of air inlets (8) via an air supply pipe (21), an air mixing chamber is provided between the air supply pipe (21) and the plurality of air inlets (8), the inner wall of the air mixing chamber is a smooth curved surface, an air inlet is provided on one side of the air mixing chamber, and a plurality of air outlets are provided on the other side, the air inlet is connected to the air supply pipe (21), and the plurality of air outlets are respectively connected to the plurality of air inlets (8); The air inlet (8) is provided with a first temperature measuring device (17), and a second temperature measuring device (18) is provided below the spherical shield (19) outside the tower (1). The first temperature measuring device (17) and the second temperature measuring device (18) are connected to a computer (4), and the computer (4) is connected to a thermal airflow system.

2. The anti-icing protection device for a wind turbine icing monitoring camera according to claim 1, characterized in that: The power source (12) is a storage battery. The power source (12) is connected to a plurality of photovoltaic panels (11). The plurality of photovoltaic panels (11) are arranged on the outer wall of the tower (1).

3. The anti-icing protection device for a wind turbine icing monitoring camera according to claim 1, characterized in that: A plurality of air inlets (8) are arranged on the upper portion of the bottom plate (20), and an air outlet (9) is arranged on the lower portion of the bottom plate (20).

4. The anti-icing protection device for a wind turbine icing monitoring camera according to claim 3 is characterized in that: The plurality of air inlets (8) are distributed at equal angles, the centers of the plurality of air inlets (8) are distributed on a distribution arc, the midpoint of the distribution arc is located at the highest point of the bottom plate (20), and the air outlet (9) is located at the lowest point of the bottom plate (20).

5. The anti-icing protection device for a wind turbine icing monitoring camera according to claim 1, characterized in that: The cross-sectional area of ​​the air outlet (9) does not exceed the sum of the cross-sectional areas of the plurality of air inlets (8).

6. The anti-icing protection device for a wind turbine icing monitoring camera according to claim 1, characterized in that: The outer protective cover (6) and the inner protective cover (7) are quartz glass covers.

7. The anti-icing protection device for a wind turbine icing monitoring camera according to claim 1, characterized in that: The connecting pipes in the thermal air flow system are all made of silicone tubes.

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