Offshore wind turbine blade accelerated life test bench

Abstract

The utility model relates to an offshore wind turbine blade accelerated life test bench, which comprises a base, an environment cover is buckled on the upper side of the rear part of the base, a test chamber is formed in the environment cover, and a wind turbine module is arranged in the test chamber; an air inlet is formed in the front side of the environment cover and connected with the outlet end of the air blower through an air pipe. An air outlet is formed in the rear side of the environment cover, and a filter screen is arranged at the air outlet; a sand container is arranged above the air pipe, and a feed opening of the sand container is communicated with the air pipe. The accelerated life test bed for the offshore wind turbine blade is easy to implement, convenient to operate and high in practicability, can perform accelerated life degradation test on the wind turbine blade under the simulated severe offshore environment, and ensures that the test result is close to actual working condition data; therefore, the fatigue and corrosion conditions of the blade of the offshore wind turbine in the severe marine environment can be accurately and reliably analyzed, and a reliable test basis is provided for improving the intelligent operation and maintenance level of the offshore wind turbine.

Description

Technical Field

[0001] The utility model relates to the technical field of fan tests, in particular to an accelerated life test bench for offshore fan blades. Background Art

[0002] The blades of offshore wind turbines work in extremely harsh marine environments for a long time. Compared with onshore wind power generation, they face more complex natural working conditions, which pose great challenges to the operation and maintenance of the blades. As the core components of offshore wind turbine generators, the complex and changeable marine environment makes the blades more vulnerable to serious damage, thus affecting the normal operation of offshore wind turbine generators.

[0003] In offshore wind farms, there are various types of blade failures, and the manifestations of various failures are different, which makes it extremely difficult to comprehensively collect blade samples of all failure types. Moreover, the current blade fatigue test benches can only simulate the fatigue tests of blades in a static state and are difficult to simulate the fatigue tests of blades in a rotating state. Due to different working conditions, there will be certain differences between static blade failure samples and actual blade failure samples. Therefore, simulating the fatigue and corrosion conditions of offshore fan blades in a harsh marine environment, especially realizing the accelerated life test of fan blades in a rotating state, is of great significance and helps to improve the intelligent operation and maintenance system of offshore fans. Content of the Utility Model

[0004] In view of this, the purpose of the utility model is to provide an accelerated life test bench for offshore fan blades that is easy to implement and convenient to operate, which can carry out the accelerated life degradation test of fan blades under simulated offshore harsh environments and ensure that the test results are close to the actual working condition data.

[0005] The utility model is implemented as follows: An accelerated life test bench for offshore fan blades includes a base. An environmental cover is buckled on the upper side of the rear part of the base, and a test chamber is formed inside the environmental cover. A fan module is arranged in the test chamber; An air inlet is arranged on the front side of the environmental cover, and the air inlet is connected to the outlet end of a blower through an air duct; An air outlet is arranged on the rear side of the environmental cover, and a filter screen is arranged at the air outlet; A sand loading container is arranged above the air duct, and the material discharging port of the sand loading container is communicated with the air duct.

[0006] Further, an anemometer and a first proportional solenoid valve are arranged on the air duct; A second proportional solenoid valve is arranged at the material discharging port of the sand loading container.

[0007] Further, a spray head, a temperature sensor, a humidity sensor and a heating lamp are arranged at the top inside the environmental cover.

[0008] Further, a sand recovery tank is provided below the filter screen, a drying box is provided below the sand recovery tank, a baffle that can be turned over and opened and closed is arranged at the bottom of the drying box, and a conveyor belt leading to a sand loading container is provided below the drying box.

[0009] Further, a fixed seat located inside the laboratory is provided on the upper side of the base, a turntable is provided on the upper side of the fixed seat, and a second motor for driving the turntable to rotate is arranged inside the fixed seat; the fan module includes a tower rod connected to the turntable at the lower end, a support seat is provided at the upper end of the tower rod, the support seat is rotatably connected with a main shaft through a bearing, a hub is connected to the front end of the main shaft, and blades are uniformly distributed on the circumference of the hub.

[0010] Compared with the prior art, the utility model has the following beneficial effects: (1) Simple implementation and high practicability: The design of this test bench is easy to operate, and can carry out the accelerated life degradation test of the fan blade under the simulated harsh marine environment, ensuring that the test conditions are close to the actual conditions, so as to accurately and reliably analyze the fatigue and corrosion of the offshore fan blade in the extreme marine environment, and improve the intelligent operation and maintenance level of the offshore fan;

[0011] (2) Unique blade rotation test: Compared with the existing test equipment, the biggest advantage of this test bench is to realize the simulation of the accelerated life degradation of the fan blade under dynamic rotation, and different windward angles can be set; this innovative design can truly reproduce the dynamic working conditions of the blade during actual operation, enabling the test to more accurately simulate the actual working conditions of different units in the wind farm and the blade damage situation, greatly improving the authenticity of the test and the reliability of the data;

[0012] (3) Complex environmental condition adjustment: This test bench can simulate and adjust complex harsh marine environmental conditions in real time, such as sand content, temperature and humidity; this design ensures the consistency and accuracy of the test environment, making the test results closer to the actual working condition data;

[0013] (4) Resource conservation and environmental protection: It is equipped with a complete set of sand recovery and reuse devices, which can process the used sand and put it back into the experiment; this design not only saves resources, reduces labor input, but also effectively avoids the pollution of the experimental environment, improving the economy and environmental protection of the experiment.

[0014] In order to make the purpose, technical solution and advantages of the utility model more clear and understandable, the following will further describe the utility model in detail through specific embodiments and related drawings. Description of the Drawings

[0015] Figure 1 is the overall structural schematic diagram of the embodiment of the utility model;

[0016] Figure 2Schematic diagram of the embodiment of the present utility model omitting the environmental cover;

[0017] Figure 3 Schematic diagram of the structure of the fan module in the embodiment of the present utility model;

[0018] Figure 4 Block diagram of the control principle in the embodiment of the present utility model;

[0019] Explanation of the reference numerals in the figure: 1 - base; 2 - blower; 3 - first air duct; 4 - anemometer; 5 - first proportional solenoid valve; 6 - second air duct; 7 - second proportional solenoid valve; 8 - sand loading container; 9 - temperature sensor; 10 - first conveyor belt; 11 - nozzle; 12 - humidity sensor; 13 - heating lamp; 14 - second conveyor belt; 15 - third conveyor belt; 16 - filter screen; 17 - recycling box; 18 - drying box; 19 - baffle; 20 - first motor; 21 - fan module; 22 - blade; 23 - hub; 24 - main shaft; 25 - bearing seat; 26 - tower pole; 27 - fixing seat. Detailed implementation manners

[0020] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0021] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary implementation manners according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] As Figures 1 to 4 As shown, a sea wind turbine blade accelerated life test bench includes a base 1, an environmental cover is buckled on the upper side of the rear part of the base 1, a test chamber is formed inside the environmental cover, and a fan module 21 is arranged in the test chamber; an air inlet is arranged on the front side of the environmental cover and the air inlet is connected to the outlet end of the blower 2 through an air duct; an air outlet is arranged on the rear side of the environmental cover and a filter screen 16 is arranged at the air outlet; a sand loading container 8 is arranged above the air duct, and the material discharging port of the sand loading container 8 is communicated with the air duct. The test bench of the present utility model can carry out the accelerated life degradation test of the wind turbine blade under the simulated harsh sea environment, ensure that the test results are close to the actual working condition data, so as to accurately and reliably analyze the fatigue and corrosion conditions of the sea wind turbine blade under the harsh marine environment, and can realize the simulation of different environments according to the needs of users, providing a reliable test basis for improving the intelligent operation and maintenance level of the sea wind turbine.

[0023] In this embodiment, an anemometer 4 and a first proportional solenoid valve 5 are provided on the air duct; a second proportional solenoid valve is provided at the discharge port of the sand loading container. The air duct consists of two sections, namely a first air duct 3 and a second air duct 6, and the two sections of the air duct are connected by the first proportional solenoid valve 5. This test bench is designed with a wind control module, including a second proportional solenoid valve connected to the data acquisition and control center, which can artificially simulate different wind speed conditions and adjust the wind speed in real time.

[0024] In this embodiment, a nozzle 11, a temperature sensor 9, a humidity sensor 12 and a heating lamp 13 are provided at the top inside the environmental hood. This test bench is designed with an environmental module, including a first proportional solenoid valve, a second proportional solenoid valve, a nozzle, a heater, a temperature sensor, and a humidity sensor connected to the data acquisition and control center, which can artificially simulate the offshore environmental conditions and adjust the sand content, temperature, and humidity of the environment in real time. In addition, the composition of the spray (such as a 5% NaCl solution by mass fraction, etc.) is prepared in advance according to the test requirements.

[0025] In this embodiment, a sand recovery tank 17 is provided below the filter screen 16, a drying oven 18 is provided below the sand recovery tank 17, a baffle 19 that can be opened and closed by flipping is provided at the bottom of the drying oven 18, one side of the baffle 19 is hinged to the same side of the bottom of the drying oven 18, a first motor 20 for controlling the flipping of the baffle is provided at one end of the drying oven 18, the main shaft of the first motor 20 and the hinge shaft of the baffle are coaxially connected, and a conveyor belt leading to the sand loading container 8 is provided below the drying oven 18; the conveyor belt consists of three sections, namely a first conveyor belt 10, a second conveyor belt 14 and a third conveyor belt 15. This test bench is provided with a sand recovery module. The filter screen is designed at the end of the environmental hood, which can separate the used sand from the air, so that all the sand can be smoothly collected into the drying oven, and a sand recovery tank is designed between the drying oven and the filter screen to isolate the drying oven from the environmental hood and prevent the drying oven from affecting the experimental environment. After the sand in the drying oven is fully dried, the first motor is used to open the baffle to pour the sand onto the conveyor belt, and then the conveyor belt transports the dried sand back into the sand loading container to complete a complete set of sand recycling.

[0026] In this embodiment, a fixed seat 27 located inside the laboratory is provided on the upper side of the base 1. A turntable is provided on the upper side of the fixed seat 27, and a second motor for driving the turntable to rotate is provided inside the fixed seat. The fan module includes a tower pole 26 with its lower end connected to the turntable. A support seat 25 is provided at the upper end of the tower pole. The support seat 25 is rotatably connected to a main shaft 24 through a bearing. The front end of the main shaft 24 is connected to a hub 23, and blades 22 are evenly distributed on the circumference of the hub. The fan module simulates the operating state of the experimental fan into the real operating state of an offshore fan, enabling the blades to be tested during rotation, and being able to adjust the orientation of the fan by rotating the turntable to control the windward angle, so as to better simulate the blade damage in different wind farms.

[0027] In this embodiment, the upper side of the rear part of the base adopts a slope surface, and the environmental cover is covered on this slope surface. The fixed seat 27 is also arranged on this slope surface, which can prevent sand accumulation.

[0028] The filter screen is connected to the rear side of the environmental cover through bolts and nuts. When the fan blades need to be replaced, unscrew the nuts of the environmental cover, take out the filter screen, take out the hub and the fixed blades from the main shaft. After the blade replacement is completed, install the hub onto the main shaft, and finally cover the filter screen again.

[0029] A data acquisition and control center is also provided on the test bench. The data acquisition and control center is respectively connected to the blower, the anemometer, the first proportional solenoid valve, the second proportional solenoid valve, the heating lamp, the temperature sensor, the humidity sensor, the spray head, and the second motor through signal lines to collect the temperature signal and humidity signal of the environmental cover, and the wind speed signal in the air duct, and respectively control the rotation speed of the blower, the amount of flowing sand, the windward angle of the fan, and the operation of the spray head and the heating lamp. Through the acquisition and control center, environmental data can be received in real time, and the device can be controlled in real time to adjust the environment, integrating all signal collection and environmental control into one.

[0030] The data acquisition and control center of the test bench integrates the control of the accelerated life test of the fan blades and the adjustment function of the environmental simulation conditions, can receive environmental data in real time and accurately adjust the environmental conditions, integrating all signal collection and environmental control into one, greatly improving the convenience of operation and the accuracy of the test.

[0031] Specific test process:

[0032] (1) Start the blower to blow air into the laboratory through the air duct;

[0033] (2) The data acquisition control center controls the flow rate of the wind speed in real time through the first proportional solenoid valve according to the input signal of the anemometer; the data acquisition control center controls the flow rate of the sand in real time through the second proportional solenoid valve according to the set amount of quicksand; the data acquisition control center controls the windward angle of the fan in real time through the second motor according to the input windward angle; the data acquisition control center controls the operation of the nozzle and the heating lamp in real time according to the input temperature and humidity signals to adjust the environment in the environmental hood, where the nozzle is mainly responsible for spraying the spray prepared in advance according to the test requirements, and the heating lamp is mainly responsible for controlling the temperature in the environmental hood; the used sand during the experiment is intercepted by the filter screen and recycled into the drying oven, and after being dried in the drying oven, the sand is sent back to the sand loading container through the conveyor belt for reuse.

[0034] (3) The accelerated life test continues until the test time set by the user is reached, and the accelerated life test ends.

[0035] For any of the technical solutions disclosed by the present utility model, unless otherwise stated, if it discloses a numerical range, the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is only the numerical values with obvious technical effects or representativeness among many feasible numerical values. Since there are too many numerical values to enumerate, the present utility model only discloses some numerical values to illustrate the technical solutions of the present utility model, and the above-listed numerical values should not constitute a limitation on the protection scope of the present invention.

[0036] If the present utility model discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (such as using bolts or screws), or it can also be understood as: a non-detachable fixed connection (such as riveting, welding). Of course, the mutual fixed connection can also be replaced by an integral structure (such as manufactured by an integral casting process) (except where it is clearly impossible to use the integral forming process).

[0037] In addition, for the terms used to represent the positional relationship or shape in any of the technical solutions disclosed by the present utility model, unless otherwise stated, their meanings include states or shapes that are approximate, similar, or close to them.

[0038] Any component provided by the present utility model can either be assembled from multiple separate components or be a single component manufactured by an integral forming process.

[0039] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution content of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. An accelerated life test bench for an offshore wind turbine blade, characterized in that: It includes a base, on the upper side of the rear part of the base, an environmental cover is buckled. A test chamber is formed inside the environmental cover, and a fan module is provided in the test chamber; an air inlet is provided on the front side of the environmental cover, and the air inlet is connected to the outlet end of a blower through an air duct; an air outlet is provided on the rear side of the environmental cover, and a filter screen is provided at the air outlet; a sand loading container is provided above the air duct, and the material discharge port of the sand loading container is communicated with the air duct.

2. The accelerated life test bench for an offshore wind turbine blade according to claim 1, wherein: An anemometer and a first proportional solenoid valve are provided on the air duct; a second proportional solenoid valve is provided at the material discharge port of the sand loading container.

3. The accelerated life test bench for an offshore wind turbine blade according to claim 1, wherein: A spray head, a temperature sensor, a humidity sensor and a heating lamp are provided at the top inside the environmental cover.

4. The accelerated life test bench for an offshore wind turbine blade according to claim 1, characterized in that: A sand recovery tank is provided below the filter screen, a drying box is provided below the sand recovery tank, a baffle that can be turned over to open and close is provided at the bottom of the drying box, and a conveyor belt leading to the sand loading container is provided below the drying box.

5. The accelerated life test bench for an offshore wind turbine blade according to claim 1, characterized in that: A fixing seat located in the test chamber is provided on the upper side of the base, a turntable is provided on the upper side of the fixing seat, and a second motor for driving the turntable to rotate is provided inside the fixing seat; the fan module includes a tower rod with the lower end connected to the turntable, a support seat is provided at the upper end of the tower rod, the support seat is rotatably connected with a main shaft through a bearing, a hub is connected to the front end of the main shaft, and blades are evenly distributed on the circumference of the hub.

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