Wind generating set blade inner cavity circulation performance test equipment

Abstract

The invention discloses a wind generating set blade inner cavity liquidity test device which comprises a portable inflation isolation plate, a flow guide pipeline, a liquidity test buffer tank, a liquidity test valve block set and a compressed nitrogen tank. A mounting hole for the flow guide pipeline to penetrate through is formed in the middle of the portable inflation isolation plate; the compressed nitrogen tank is respectively communicated with the portable inflation isolation plate and the flow guide pipeline through the liquidity test valve block group; according to the invention, the portable inflatable isolation plate is matched with the flow guide pipeline, the compressed nitrogen tank and the circulation test valve block group, so that the outer wall of the portable inflatable isolation plate and the inner wall of the blade of the wind generating set as well as the inner wall of the portable inflatable isolation plate and the outer wall of the flow guide pipeline are quickly sealed by using an air pressure principle; and later disassembly is facilitated, the construction time and manpower consumption are effectively reduced, and the phenomenon of material waste is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of de-icing transformation of wind turbines, and specifically to a test device for the fluidity of the inner cavity of the blades of a wind turbine. Background Art

[0002] In winter, the icing of the blades of wind turbines is a worldwide problem, mainly concentrated in temperate regions with relatively high environmental humidity. Generally, when the blades of the unit are iced, in order to avoid safety hazards (ice block falling), the unit has to stop running and wait for the ice to melt, resulting in a large loss of power generation;

[0003] Gas heating de-icing is one of the means for the blades of wind turbines to resist freezing, that is: installing electric heaters and blowers in the inner cavity of the blades, and using a method similar to a "hair dryer" to make hot air circulate inside the blade cavity to indirectly heat the entire blade surface and melt the ice layer on the blade surface. As shown in, before performing the gas heating de-icing technical transformation, it is necessary to first confirm that the cavities at the front and rear edges of the blade are unobstructed to ensure that the hot air forms a hot air flow blade heating cycle inside the blade in sequence: leading edge inner cavity → blade tip web gap 1 → blade tip web gap 2 → trailing edge inner cavity. Figure 1 shown, before performing the gas heating de-icing technical transformation, it is necessary to first confirm that the cavities at the front and rear edges of the blade are unobstructed to ensure that the hot air forms a hot air flow blade heating cycle inside the blade in sequence: leading edge inner cavity → blade tip web gap 1 → blade tip web gap 2 → trailing edge inner cavity.

[0004] At present, there is no standardized detection method for the fluidity of the inner cavity of the blades in the industry. Generally, all gas heating de-icing equipment except the de-icing heater and control cabinet is assembled by hand-laying pre-installed baffle plates, blower heater brackets inside the blade, and then starting the blower for "trial blowing". If the air duct inside the blade is blocked, the equipment can only be removed. All baffle plates, brackets, and pipes cannot be broken due to the hand-laying and curing reasons, and forced breaking may damage the internal structure of the blade. Moreover, the existing baffle plates are made of hand-laid fiberglass composite materials, which are heavy and inconvenient to carry. The sealing between the baffle plates and the inner cavity wall of the blade and the hot air pipes is achieved by hand-laying resin materials, and the curing time is at least 8-12 hours; therefore, the above test defects are:

[0005] 1. The space of the wind turbine hub is limited and it is difficult to achieve air circulation, and the oxygen content is limited. There is a risk of hypoxia when multiple people are constructing;

[0006] 2. The hand-laying construction period is long;

[0007] 3. Once it is confirmed that the blade does not have the conditions for technical transformation, the hand-laid facilities cannot be removed, resulting in material and labor losses;

[0008] 4. Equipment such as blowers, baffle plates, and brackets is very heavy, and the space of the wind turbine hub is limited, so the construction is time-consuming and laborious;

[0009] 5. The equipment that cannot be removed increases the ineffective load of the blade and affects the power generation efficiency of the unit.

[0010] Therefore, a test device for the internal cavity fluidity of a wind turbine blade is proposed. Summary of the Invention

[0011] The purpose of the present invention is to provide a test device for the internal cavity fluidity of a wind turbine blade, thereby solving or at least alleviating one or more of the above problems and other problems existing in the prior art.

[0012] To achieve the above purpose, the present invention provides the following technical solutions: A test device for the internal cavity fluidity of a wind turbine blade, comprising:

[0013] A portable inflatable isolation plate, an installation hole for a diversion pipeline to pass through is provided in the middle of the portable inflatable isolation plate. Under the internal air pressure of the portable inflatable isolation plate filled with air, the outer wall of the portable inflatable isolation plate () is hermetically attached to the inner wall of the wind turbine blade, and the inside of the portable inflatable isolation plate () is hermetically attached to the outer wall of the diversion pipeline;

[0014] A compressed nitrogen gas tank;

[0015] A fluidity test valve block group, the compressed nitrogen gas tank is respectively connected to the portable inflatable isolation plate and the diversion pipeline through the fluidity test valve block group.

[0016] In a test device for the internal cavity fluidity of a wind turbine blade according to the present invention, optionally, the fluidity test valve block group includes a connecting pipeline. The lower end of the connecting pipeline is connected to the air outlet of the compressed nitrogen gas tank through a first connection interface, the upper end of the connecting pipeline is connected to the air inlet of the portable inflatable isolation plate through a second connection interface, and a first pilot-operated spring reducing valve is provided between the second connection interface and the connecting pipeline. A third connection interface is communicated with the connecting pipeline, and the connecting pipeline is connected to the diversion pipeline through the third connection interface.

[0017] In a test device for the internal cavity fluidity of a wind turbine blade according to the present invention, optionally, a test exhaust valve is installed on the diversion pipeline, and the test exhaust valve is set as a butterfly valve.

[0018] In a test device for the internal cavity fluidity of a wind turbine blade according to the present invention, optionally, it further includes a fluidity test buffer tank. The air outlet of the fluidity test buffer tank is connected to the air inlet of the diversion pipeline, the air inlet of the fluidity test buffer tank is connected to the third connection interface, and a second pilot-operated spring reducing valve is provided between the third connection interface and the connecting pipeline ().

[0019] In a test device for the internal cavity fluidity of a wind turbine blade according to the present invention, optionally, a heater and a temperature control device are installed inside the fluidity test buffer tank. The temperature control device includes a PT100 temperature sensor and a temperature controller. The PT100 temperature sensor is used to monitor the temperature inside the heater, and the temperature controller is electrically connected to the PT100 temperature sensor and the heater respectively to control the operation of the heater.

[0020] In a test device for the internal cavity fluidity of a wind turbine blade according to the present invention, optionally, a start valve for controlling the on-off of the gas path inside the connection pipeline is installed on the connection pipeline.

[0021] In a test device for the internal cavity fluidity of a wind turbine blade according to the present invention, optionally, a first safety valve and a first pressure monitoring interface are installed on the portable inflatable isolation plate.

[0022] In a test device for the internal cavity fluidity of a wind turbine blade according to the present invention, optionally, a second pressure monitoring interface and a second safety valve are installed on the fluidity test buffer tank.

[0023] In a test device for the internal cavity fluidity of a wind turbine blade according to the present invention, optionally, a third safety valve and a first pipeline pressure monitoring interface are provided between the start valve and the first connection interface on the connection pipeline, and a second pipeline pressure monitoring interface is provided at the gas outlet of the connection pipeline near the start valve.

[0024] In a test device for the internal cavity fluidity of a wind turbine blade according to the present invention, optionally, a deflation valve for discharging the gas inside the portable inflatable isolation plate is installed on the portable inflatable isolation plate.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. By setting the portable inflatable isolation plate in cooperation with the diversion pipeline, the compressed nitrogen tank, and the fluidity test valve block group, the rapid sealing between the outer wall of the portable inflatable isolation plate and the inner wall of the wind turbine blade, and between the inner wall of the portable inflatable isolation plate and the outer wall of the diversion pipeline is realized by using the air pressure principle, and it is convenient for later disassembly, effectively reducing the construction time and labor consumption, and there will be no phenomenon of material waste;

[0027] 2. Compared with the traditional method, the weight and volume of the whole set of test equipment are effectively reduced, which is convenient for transportation and carrying. Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the internal hot air flow direction structure when deicing the wind turbine blade;

[0029] Figure 2 This is a schematic structural diagram of a device for testing the internal cavity fluidity of a wind turbine blade according to the present invention;

[0030] Figure 3 This is a schematic structural diagram of a portable inflatable isolation plate of a device for testing the internal cavity fluidity of a wind turbine blade according to the present invention;

[0031] Figure 4 This is a pneumatic control diagram of a device for testing the internal cavity fluidity of a wind turbine blade according to the present invention.

[0032] In the figure: 1. Portable inflatable isolation plate; 101. First safety valve; 102. Air release valve; 103. First pressure monitoring interface; 104. Mounting hole;

[0033] 2. Diversion pipeline;

[0034] 3. Fluidity test buffer tank; 301. Second pressure monitoring interface; 302. Second safety valve;

[0035] 4. Fluidity test valve block group; 401. Connecting pipeline; 402. First connection interface; 403. Second connection interface; 404. Third connection interface; 405. Start valve; 406. Third safety valve; 407. First pipeline pressure monitoring interface; 408. First pilot-operated spring reducing valve; 409. Second pilot-operated spring reducing valve; 410. Second pipeline pressure monitoring interface;

[0036] 5. Compressed nitrogen tank; 6. Test exhaust valve; 7. Heater; 8. Temperature control device. Specific embodiments

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] Embodiment 1

[0039] Please refer to Figures 2 to 4 , the present invention provides a technical solution:

[0040] A device for testing the internal cavity fluidity of a wind turbine blade includes a portable inflatable isolation plate 1, a diversion pipeline 2, a fluidity test buffer tank 3, a fluidity test valve block group 4, and a compressed nitrogen tank 5.

[0041] Among them, an installation hole 104 for the diversion pipeline 2 to pass through is provided in the middle of the portable inflatable isolation board 1. Under the internal air pressure of the portable inflatable isolation board 1 filled with air, the outer wall of the portable inflatable isolation board 1 is hermetically attached to the inner wall of the wind turbine blade, and the inner part of the portable inflatable isolation board 1 is hermetically attached to the outer wall of the diversion pipeline 2. That is to say, the portable inflatable isolation board 1 is made of deformable rubber material, and the sealing between the portable inflatable isolation board 1 and the inner wall of the blade cavity and the diversion pipeline 2 is realized through the elastic deformation of the inflatable structure under the action of the internal air pressure.

[0042] The compressed nitrogen tank 5 is respectively connected to the portable inflatable isolation board 1 and the diversion pipeline 2 through the flowability test valve block group 4. In this embodiment, the flowability test valve block group 4 includes a connecting pipeline 401. The lower end of the connecting pipeline 401 is connected to the air outlet of the compressed nitrogen tank 5 through a first connection interface 402, and the upper end of the connecting pipeline 401 is connected to the air inlet of the portable inflatable isolation board 1 through a second connection interface 403. A first pilot-operated spring reducing valve 408 is provided between the second connection interface 403 and the connecting pipeline 401. A third connection interface 404 is communicated with the connecting pipeline 401, and the connecting pipeline 401 is connected to the diversion pipeline 2 through the third connection interface 404;

[0043] Specifically, a start valve 405 for controlling the on-off of the gas path inside the connecting pipeline 401 is installed on the connecting pipeline 401. After the start valve 405 is opened, the compressed nitrogen flows through the first pilot-operated spring reducing valve 408 and enters the portable inflatable isolation board 1. The nitrogen flow rate decreases as the portable inflatable isolation board 1 is inflated. When the internal pressure sampling pipeline of the first pilot-operated spring reducing valve 408 is balanced with the spring force supporting the valve core (checked according to the nitrogen pressure of 4000 Pa), the valve core is in the fully closed gas path position, and the inflation of the portable inflatable isolation board 1 is completed.

[0044] A first safety valve 101 and a first pressure monitoring interface 103 are installed on the portable inflatable isolation board 1. A deflation valve 102 for discharging the gas inside the portable inflatable isolation board 1 is installed on the portable inflatable isolation board 1. By setting the first pressure monitoring interface 103, it is convenient for the operator to check the inflation pressure with a pressure gauge. By setting the first safety valve 101, when the internal pressure of the portable inflatable isolation board 1 exceeds the threshold value, the gas inside the portable inflatable isolation board 1 can be quickly discharged to prevent overpressure from damaging the equipment.

[0045] Specifically, a third safety valve 406 and a first pipeline pressure monitoring interface 407 are provided on the connecting pipeline 401 between the start valve 405 and the first connection interface 402. A second pipeline pressure monitoring interface 410 is provided near the air outlet of the start valve 405 on the connecting pipeline 401. The first pipeline pressure monitoring interface 407 and the second pipeline pressure monitoring interface 410 are provided to facilitate the operator to measure and confirm the pressure of the connecting pipeline 401 using a pressure gauge. To prevent overpressure caused by the relative pressure change of the system due to drastic changes in temperature and altitude, the third safety valve 406 limits the total system pressure to 1.2 MPa (overpressure relief). To avoid low-temperature frostbite of the operators when the safety valve releases, a compressed air silencer is provided at the discharge port of the third safety valve 406 to extend the discharge path and time of the compressed gas, allowing the high-pressure gas to have enough time to absorb heat from the surrounding environment to avoid directly injuring the staff when discharging directly.

[0046] To further improve the stability of the nitrogen delivery pressure, the air outlet of the flowability test buffer tank 3 is connected to the air inlet of the diversion pipeline 2, and the air inlet of the flowability test buffer tank 3 is connected to the third connection interface 404. A second pilot-operated spring pressure reducing valve 409 is provided between the third connection interface 404 and the connecting pipeline 401. Considering that the test gas source is 1 MPa compressed nitrogen, and during the flowability test process, the test pressure is basically below 3300 Pa, which will cause a drastic drop in the temperature of the test gas, thus affecting the flowability test accuracy. A heater 7 and a temperature control device 8 are installed inside the flowability test buffer tank 3. The temperature control device 8 includes a PT100 temperature sensor and a temperature controller. The PT100 temperature sensor is used to monitor the temperature inside the heater 7. The temperature controller is electrically connected to the PT100 temperature sensor and the heater 7 respectively to control the operation of the heater 7. The temperature controller stabilizes the gas temperature inside the flowability test buffer tank 3 at 18 - 25 °C, and the specific temperature is determined according to the ambient temperature at the test site. A second pressure monitoring interface 301 and a second safety valve 302 are installed on the flowability test buffer tank 3. The second pressure monitoring interface 301 is provided to facilitate the operator to check the inflation pressure inside the flowability test buffer tank 3 using a pressure gauge. The second safety valve 302 is provided to prevent equipment damage due to overpressure. A test exhaust valve 6 is installed on the diversion pipeline 2. Considering that the opening speed of the test start valve should be as fast as possible, the test exhaust valve 6 is set as a butterfly valve.

[0047] After the start valve 405 is opened, the compressed nitrogen gas flows through the second pilot-operated spring pressure reducing valve 409 and enters the flowability test buffer tank 3. When the internal pressure sampling pipeline of the second pilot-operated spring pressure reducing valve 409 is balanced with the spring force supporting the valve core (calibrated according to the nitrogen pressure of 3300 Pa), the valve core is in the fully closed gas path position, and the inflation of the flowability test buffer tank is completed.

[0048] It should be noted that in order to avoid airtight seal leakage between the portable inflatable isolation plate 1 and the inner wall of the blade and between the portable inflatable isolation plate 1 and the diversion pipeline 2 during the test, the pressure of the portable inflatable isolation plate 1 must be the pre-inflation pressure of the test buffer tank 3 for fluidity.

[0049] To facilitate the understanding of the above technical solution of the present invention, the working principle or operation method of the present invention in the actual process will be described in detail below.

[0050] Specifically, it includes the following steps:

[0051] S1. Place the portable inflatable isolation plate 1 at the test point in the inner cavity of the blade, and insert the diversion pipeline 2 into the mounting hole 104 on the portable inflatable isolation plate 1;

[0052] S2. Connect the compressed nitrogen tank 5 to the fluidity test valve block group 4;

[0053] S3. Manually open the start valve 405

[0054] S4. Confirm the pressure at each measuring point through the handheld pressure gauge PG. The pressure inside the portable inflatable isolation plate 1 is: 4500 Pa, and the internal pressure of the fluidity test buffer tank 3 is: 3300 Pa;

[0055] S5. Continuous blowing test: Open the test exhaust valve 6, and record the static pressure, dynamic pressure, and internal temperature curve of the fluidity test buffer tank 3 in the diversion pipeline 2;

[0056] At this time, the nitrogen inside the fluidity test buffer tank 3 rushes into the internal flow channel of the blade. When the pressure of the fluidity test buffer tank 3 is lower than 3300 Pa, the second pilot-operated spring pressure reducing valve 409 opens to continue injecting nitrogen into the fluidity test buffer tank 3. When the temperature of the nitrogen inside the fluidity test buffer tank 3 is too low, start the heater 7 to compensate for the nitrogen pressure reduction temperature difference. Through the static pressure and dynamic pressure test points set in the diversion pipeline 2, combined with the cross-sectional geometric dimensions and temperature information of the diversion pipeline 2, the nitrogen flow rate flowing through the inner cavity of the blade can be calculated, and whether there is a blockage in the inner cavity of the blade can be deduced from the flow rate information;

[0057] Then, adopt the pulse impact test: Close the start valve 405, open the test exhaust valve 6, and record the static pressure, dynamic pressure, and buffer tank temperature curve in the diversion pipeline 2;

[0058] At this time, 3.5 liters of nitrogen at 3300 Pa rushes into the internal flow channel of the blade in a curve approximately like a parabola. Through the static pressure and dynamic pressure test points set in the diversion pipeline 2, combined with the cross-sectional geometric dimensions and temperature information of the diversion pipeline 2, the nitrogen flow rate flowing through the inner cavity of the blade can be calculated, and whether there is a blockage in the inner cavity of the blade can be deduced from the flow rate information.

[0059] S6, Computational Fluid Dynamics (CFD) verification;

[0060] Establish a model of the internal flow channel of the blade according to the blade structure drawing, and calculate the pressure and flow distribution in the internal flow channel of the blade according to the nitrogen medium (at room temperature, pressure as a function curve);

[0061] Combining the test results of the two tests in step S5, the minimum flow cross-section (blockage) size of the internal cavity flow channel of the blade and the blockage position approximately related to the flow channel length can be deduced.

[0062] Parts not involved in the present invention are the same as the prior art or can be implemented by the prior art. Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wind turbine blade cavity flow test device, characterized in that: include: A portable inflatable isolation board (1), wherein a mounting hole (104) for a guide pipe (2) to pass through is provided in the middle of the portable inflatable isolation board (1), and under the internal air pressure of the portable inflatable isolation board (1) filled with air, the outer wall of the portable inflatable isolation board (1) is sealed and fitted with the inner wall of a blade of a wind turbine generator set, and the inside of the portable inflatable isolation board (1) is sealed and fitted with the outer wall of the guide pipe (2); Compressed nitrogen tank (5); A flowability test valve block group (4), wherein the compressed nitrogen tank (5) is respectively connected to the portable inflatable isolation board (1) and the flow guide pipe (2) through the flowability test valve block group (4).

2. A wind turbine blade inner cavity flow test device according to claim 1, characterized in that: The flowability test valve block group (4) comprises a connecting pipeline (401), the lower end of the connecting pipeline (401) is connected to the air outlet of the compressed nitrogen tank (5) through a first connecting interface (402), the upper end of the connecting pipeline (401) is connected to the air inlet of the portable inflatable isolation board (1) through a second connecting interface (403), a first pilot spring pressure reducing valve (408) is arranged between the second connecting interface (403) and the connecting pipeline (401), the connecting pipeline (401) is connected to a third connecting interface (404), and the connecting pipeline (401) is connected to the diversion pipeline (2) through the third connecting interface (404).

3. A wind turbine blade inner cavity flow test device according to claim 2, characterized in that: A test exhaust valve (6) is installed on the flow guide pipe (2), and the test exhaust valve (6) is configured as a butterfly valve.

4. The wind turbine blade inner cavity flow test device according to claim 3, characterized in that: It also includes a flowability test cache tank (3), the air outlet of the flowability test cache tank (3) is connected to the air inlet of the guide pipe (2), the air inlet of the flowability test cache tank (3) is connected to the third connection interface (404), and a second pilot spring pressure reducing valve (409) is arranged between the third connection interface (404) and the connecting pipeline (401).

5. The wind turbine blade inner cavity flow test device according to claim 4, characterized in that: A heater (7) and a temperature control device (8) are installed inside the fluidity test buffer tank (3). The temperature control device (8) includes a PT100 temperature sensor and a temperature controller. The PT100 temperature sensor is used to monitor the temperature inside the heater (7). The temperature controller is electrically connected to the PT100 temperature sensor and the heater (7) respectively, and is used to control the operation of the heater (7).

6. The wind turbine blade inner cavity flow test device according to claim 4, characterized in that: The connecting pipeline (401) is provided with a starting valve (405) for controlling the on-off of the gas path inside the connecting pipeline (401).

7. The wind turbine blade inner cavity flow test device according to claim 2, characterized in that: The portable inflatable isolation panel (1) is provided with a first safety valve (101) and a first pressure monitoring interface (103).

8. The wind turbine blade inner cavity flow testing device according to claim 4, characterized in that: The flowability test cache tank (3) is installed with a second pressure monitoring interface (301) and a second safety valve (302).

9. The wind turbine blade inner cavity flow test device according to claim 6, characterized in that: A third safety valve (406) and a first pipeline pressure monitoring interface (407) are provided on the connecting pipeline (401) between the starting valve (405) and the first connecting interface (402), and a second pipeline pressure monitoring interface (410) is provided on the connecting pipeline (401) near the air outlet of the starting valve (405).

10. The wind turbine blade inner cavity flow testing device according to claim 7, characterized in that: The portable inflatable isolation board (1) is provided with an air release valve (102) for discharging the gas inside the portable inflatable isolation board (1).

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