Wind power blade rain erosion testing device and method

Abstract

The invention relates to the technical field of blade testing, and particularly discloses a wind power blade rain erosion testing device which comprises a wind power blade body and a supporting box, a limiting hole matched with the wind power blade body is formed in one side of the supporting box, and two supporting rods are arranged between the two opposite sides of the supporting box. A plurality of sliding blocks are installed between the two supporting rods in a sliding mode, a scissor arm is arranged between every two adjacent sliding blocks, nozzles are arranged on the horizontal sections, away from the scissor arms, of the sliding blocks, drainage pieces are arranged at connectors of the nozzles, and a driving assembly used for adjusting the distance between the sliding blocks is arranged in the supporting box. A drainage pipe is arranged between the two opposite sides of the supporting box, and a plurality of flow equalizing assemblies are arranged on the side wall of the drainage pipe. The device has a function of simulating the change of the scouring flow of the wind power blade by rainwater, improves the authenticity of rain erosion test data, has a water circulation function, and is more energy-saving and environment-friendly.

Description

Technical Field

[0001] The present invention relates to the technical field of blade testing, and in particular to a wind turbine blade rain erosion testing device and method. Background Art

[0002] Wind turbine blades are the core components of wind turbines that convert natural wind energy into electricity for wind turbines. They are also the main basis for measuring the design and technical level of wind turbines. There is no standard evaluation method and assessment standard for the protection life or durability of wind turbine blades. Rainwater erosion is one of the main destructive factors for wind turbine blades. Rainwater will damage the surface of the blades and ultimately affect the power generation efficiency. It is generally recognized in the industry that the protection life is evaluated by simulating the scouring damage of high-speed rainwater through experimental equipment. The erosion site of wind turbine blades is mainly concentrated on the leading edge of the blades.

[0003] A Chinese patent (CN211927651U) discloses a wind turbine blade rain erosion test device, including a test box, a cover, a hinge, a rotating plate, a workpiece, a motor, a transmission and a nozzle. A test chamber is arranged in the middle of the test box, a drainage port is arranged at the rear end of the test box, a storage port is arranged at the front end of the test box, the cover is rotatably connected to the front end of the test box through a hinge to cover the storage port, a first handle is arranged at the front end of the cover, a bearing is arranged at the side end of the test box, both ends of the rotating plate are rotatably connected with the bearing, the workpiece is mounted on the rotating plate, a bottom plate is arranged at the left end of the test box, the motor and the transmission are both mounted at the left end of the test box, and the nozzle is mounted on the top of the test chamber through a spray device.

[0004] However, there are some drawbacks in the above-mentioned related technologies. For example, during use, the existing wind turbine blade rain erosion test device generally has a constant spray water volume. However, during actual outdoor use of wind turbine blades, the leading edge of the blades makes high-speed circular motion, and the flow rate of rainwater on the blades changes linearly, resulting in inaccurate blade rain erosion test data. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a wind turbine blade rain erosion testing device and method, which can overcome the technical defects.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A wind turbine blade rain erosion testing device comprises a wind turbine blade body and a support box, wherein one side of the support box is provided with a limiting hole matching the wind turbine blade body, two support rods are provided between the opposite sides of the support box, a plurality of sliders are slidably installed between the two support rods, a scissor arm is provided between two adjacent sliders, a nozzle is provided at a horizontal section of the slider away from the scissor arm, the nozzle matches the wind turbine blade body, a drainage piece is provided at the interface of the nozzle, a driving assembly for adjusting the spacing between the plurality of sliders is provided in the support box, a drainage pipe is provided between the opposite sides of the support box, a plurality of flow equalizing assemblies are provided on the side wall of the drainage pipe, a hose is connected between the drainage piece and adjacent flow equalizing assemblies, and a pumping assembly is provided at the water inlet of the drainage pipe.

[0007] Preferably, four universal pulleys are provided at the bottom end of the support box, two of which are provided with self-locking structures.

[0008] Preferably, a water inlet pipe is provided on a side of the wind turbine blade body away from the limiting hole, and the water inlet pipe is located below the wind turbine blade body.

[0009] Preferably, the driving assembly includes a rotating shaft, which passes through and is rotatably installed between two opposite sides of the supporting box, the side wall of the rotating shaft is provided with a threaded body, the slider near the limiting hole is threadedly connected to the rotating shaft through the threaded body, and the side wall of the rotating shaft is provided with two limiting rings, the limiting rings are fixedly sleeved with the rotating shaft, and the two limiting rings are fitted to the opposite sides of the slider away from the limiting hole.

[0010] Preferably, a servo motor is provided on one side of the support box, and the output shaft of the servo motor is fixedly connected to the rotating shaft through a coupling.

[0011] Preferably, the pumping assembly includes a drainage cylinder, which passes through and is fixedly installed on a side of the support box away from the limiting hole. A U-shaped tube is arranged between the drainage cylinder and the drainage tube, and a water pump is arranged on the side wall of the U-shaped tube. The port of the drainage cylinder located in the support box is installed with a filter through fasteners.

[0012] Preferably, the flow equalizing assembly includes a support tube and a sleeve, the support tube penetrates and is fixedly connected to the drainage tube, the sleeve is fixedly sleeved on the outer wall of the support tube, a plurality of drainage channels are arranged on the side wall of the support tube, a flow limiting plug is slidably installed in the support tube, and a spring is arranged between the flow limiting plug and the inner wall of one end of the support tube away from the drainage tube.

[0013] Preferably, the cross-section of the drainage channel is in the shape of a rounded rectangle, and a plurality of partitions are arranged in the drainage channel, and the partitions are used to separate bubbles in the water flow.

[0014] A wind turbine blade rain erosion test method comprises the following steps: S1. Insert the wind turbine blade body into the support box through the limiting hole, and use an external fixing device to assist in fixing the wind turbine blade body, so that the end of the wind turbine blade body is located in the support box; S2. Water is injected into the support box through the water inlet pipe, and then the water pump pumps the water in the support box. The water flows into the drainage pipe through the drainage tube and the U-shaped tube, and then sprays to the wind turbine blade body through multiple flow balancing components, hoses, drainage parts and nozzles. The water flows from the drainage pipe into the support tube, flows into the sleeve through multiple drainage channels, and then flows into the hose. The greater the water pressure, the more the flow limiter squeezes the spring, and the area of ​​the drainage channel flows increases linearly; S3. The servo motor drives the shaft to rotate back and forth, and drives the slider close to the limit hole to slide back and forth between the two support rods through the threaded body. The two limit rings limit the slider away from the limit hole on the shaft. In conjunction with multiple scissor arms, the spacing between the multiple sliders is driven to increase or decrease linearly, simulating the change in water flow at the end of the wind turbine blade body during operation in the rain.

[0015] Preferably, the water in the support box is recycled, and the filter screen cooperates with the drainage tube to filter out debris or large-sized impurities in the water.

[0016] The beneficial effects of the present invention are: 1. By setting up the pumping assembly, the beneficial effect that can be obtained is that a limiting hole matching the wind turbine blade body is set on one side of the support box, two supporting rods are set between the two opposite sides of the support box, a plurality of sliders are slidably installed between the two supporting rods, a scissor arm is set between two adjacent sliders, a nozzle is set at the horizontal section of the slider away from the scissor arm, the nozzle matches the wind turbine blade body, a drainage piece is set at the interface of the nozzle, the drainage tube passes through and is fixedly installed on the side of the support box away from the limiting hole, a U-shaped tube is set between the drainage tube and the drainage tube, a water pump is set on the side wall of the U-shaped tube, and a filter is installed at the port of the drainage tube located in the support box through a fastener; Water is injected into the support box through the water inlet pipe, and then the water pump pumps the water in the support box. The water flows into the drainage pipe through the drainage tube and the U-tube, and then is sprayed to the wind turbine blade body through multiple flow equalization components, hoses, drainage parts and nozzles. It has the function of water circulation and is more energy-saving and environmentally friendly.

[0017] 2. By setting the driving assembly, the beneficial effect that can be obtained is that the rotating shaft passes through and is rotatably installed between the two opposite sides of the support box, the side wall of the rotating shaft is provided with a threaded body, the slider near the limiting hole is threadedly connected with the rotating shaft through the threaded body, the side wall of the rotating shaft is provided with two limiting rings, the limiting rings are fixedly sleeved with the rotating shaft, the two limiting rings are fitted on both sides of the slider away from the limiting hole, a servo motor is provided on one side of the support box, and the output shaft of the servo motor is fixedly connected with the rotating shaft through a coupling; The servo motor drives the rotating shaft to rotate reciprocatingly, and drives the slider close to the limit hole to slide back and forth between the two support rods through the threaded body. The two limit rings limit the slider far away from the limit hole on the rotating shaft. In conjunction with multiple scissor arms, the spacing between multiple sliders is driven to increase or decrease linearly, simulating the change in water flow rate that the end of the wind turbine blade body is subjected to during operation in the rain. It has the function of simulating the change in the flow rate of rainwater scouring the wind turbine blade, thereby improving the authenticity of rain erosion test data.

[0018] 3. By setting the flow balancing component, the beneficial effect that can be obtained is that the support tube and the drainage tube are penetrated and fixedly connected, the sleeve is fixedly sleeved on the outer wall of the support tube, the side wall of the support tube is provided with a plurality of drainage channels, a flow limiting plug is slidably installed in the support tube, a spring is provided between the flow limiting plug and the inner wall of the end of the support tube away from the drainage tube, the cross section of the drainage channel is set in a rounded rectangular shape, and a plurality of partitions are provided in the drainage channel, and the partitions are used to separate bubbles in the water flow; The water flows into the branch tube from the drainage pipe, flows into the sleeve through multiple drainage channels, and then flows into the hose. The greater the water pressure, the more the flow limiting plug squeezes the spring, and the flow area of ​​the drainage channel increases linearly, which has an isobaric spraying function and improves the simulation authenticity of rainwater flow changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a top view of the present invention; Figure 3 It is the installation structure diagram of the driving assembly in the present invention; Figure 4 The figure is a structural diagram of the installation of the nozzle and the flow guide member in the present invention; Figure 5 It is an installation structure diagram of the hose and the flow equalizing assembly in the present invention; Figure 6 The figure is a structural diagram of the installation of the flow balancing assembly and the drainage pipe in the present invention; Figure 7 The figure is a structural diagram of the installation of the filter screen and the drainage tube in the present invention; Figure 8 The figure is a structural diagram of the support tube and the sleeve in the present invention; Fig. 9 It is a cross-sectional view of the current balancing component in the present invention.

[0021] Description of reference numerals: In the figure: 1. wind turbine blade body; 2. support box; 21. universal pulley; 22. water inlet pipe; 31. slider; 32. support rod; 33. scissor arm; 34. nozzle; 35. drainage member; 41. rotating shaft; 42. threaded body; 43. limiting ring; 44. servo motor; 51. drainage pipe; 52. flow equalizing assembly; 53. hose; 61. drainage tube; 62. U-shaped tube; 63. water pump; 64. filter; 71. support tube; 72. sleeve; 73. drainage channel; 74. flow limiting plug; 75. spring; 76. partition. DETAILED DESCRIPTION

[0022] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are clearly and completely described below in combination with the accompanying drawings and preferred embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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.

[0023] In the description of the present application, it should be understood that the orientation or position relationship indicated by "inside", "outside", etc. is based on the orientation or position described in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, a specific orientation structure and operation, and therefore cannot be understood as a limitation on the present application.

[0024] Reference Figure 1-Figure 9 , is a wind turbine blade rain erosion testing device disclosed in the present invention, comprising a wind turbine blade body 1 and a support box 2, one side of the support box 2 is provided with a limiting hole matching the wind turbine blade body 1, the bottom end of the support box 2 is provided with four universal pulleys 21, two of which are provided with self-locking structures, a water inlet pipe 22 is provided on the side of the wind turbine blade body 1 away from the limiting hole, the water inlet pipe 22 is located below the wind turbine blade body 1, two support rods 32 are provided between the opposite sides of the support box 2, a plurality of sliders 31 are slidably installed between the two support rods 32, a scissor arm 33 is provided between two adjacent sliders 31, a nozzle 34 is provided on the horizontal section of the slider 31 away from the scissor arm 33, the nozzle 34 matches the wind turbine blade body 1, and a drainage piece 35 is provided at the interface of the nozzle 34.

[0025] A driving assembly for adjusting the spacing between multiple sliders 31 is provided in the support box 2, and the driving assembly includes a rotating shaft 41, which passes through and is rotatably installed between the opposite sides of the support box 2, and a threaded body 42 is provided on the side wall of the rotating shaft 41, and the slider 31 close to the limiting hole is threadedly connected to the rotating shaft 41 through the threaded body 42, and two limiting rings 43 are provided on the side wall of the rotating shaft 41, and the limiting rings 43 are fixedly sleeved with the rotating shaft 41, and the two limiting rings 43 are fitted to the opposite sides of the slider 31 away from the limiting hole, and a servo motor 44 is provided on one side of the support box 2, and the output shaft of the servo motor 44 is fixedly connected to the rotating shaft 41 through a coupling, and a drainage pipe 51 is provided between the opposite sides of the support box 2, and a plurality of flow equalizing components 52 are provided on the side wall of the drainage pipe 51, and a hose 53 is connected between the drainage member 35 and the adjacent flow equalizing components 52.

[0026] The water inlet of the drainage tube 51 is provided with a pumping assembly, which includes a drainage tube 61. The drainage tube 61 passes through and is fixedly installed on the side of the support box 2 away from the limiting hole. A U-shaped tube 62 is arranged between the drainage tube 61 and the drainage tube 51. A water pump 63 is arranged on the side wall of the U-shaped tube 62. The port of the drainage tube 61 located in the support box 2 is installed with a filter screen 64 through fasteners.

[0027] The flow balancing component 52 includes a support tube 71 and a sleeve 72. The support tube 71 penetrates and is fixedly connected to the drainage tube 51. The sleeve 72 is fixedly sleeved on the outer wall of the support tube 71. A plurality of drainage channels 73 are arranged on the side wall of the support tube 71. A flow limiting plug 74 is slidably installed in the support tube 71. A spring 75 is arranged between the flow limiting plug 74 and the inner wall of the end of the support tube 71 away from the drainage tube 51. The cross-section of the drainage channel 73 is a rounded rectangular shape. A plurality of partitions 76 are arranged in the drainage channel 73. The partitions 76 are used to separate bubbles in the water flow.

[0028] The present invention also discloses a wind turbine blade rain erosion testing method, comprising the following steps: S1. Insert the wind turbine blade body 1 into the support box 2 through the limiting hole, and fix the wind turbine blade body 1 with an external fixing device, so that the end of the wind turbine blade body 1 is located in the support box 2; S2. Water is injected into the support box 2 through the water inlet pipe 22, and then the water pump 63 pumps the water in the support box 2. The water flows into the drainage pipe 51 through the drainage tube 61 and the U-shaped tube 62, and then is sprayed toward the wind turbine blade body 1 through multiple flow balancing components 52, the hose 53, the drainage member 35 and the nozzle 34. The water flows from the drainage pipe 51 into the support tube 71, flows into the sleeve 72 through multiple drainage channels 73, and then flows into the hose 53. The greater the water pressure, the more the flow limiting plug 74 squeezes the spring 75, and the flow area of ​​the drainage channel 73 increases linearly. S3, the servo motor 44 drives the rotating shaft 41 to rotate back and forth, and drives the slider 31 close to the limiting hole to slide back and forth between the two support rods 32 through the threaded body 42. The two limiting rings 43 limit the slider 31 away from the limiting hole on the rotating shaft 41, and cooperate with the multiple scissor arms 33 to drive the spacing between the multiple sliders 31 to increase or decrease linearly, simulating the change in water flow that the end of the wind turbine blade body 1 is subjected to during operation in the rain.

[0029] From S1 to S3, the water in the support box 2 is circulated, and the filter screen 64 cooperates with the drainage tube 61 to filter the sundries or large-sized impurities in the water.

[0030] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A wind turbine blade rain erosion test device, characterized in that: The invention comprises a wind turbine blade body (1) and a support box (2), wherein one side of the support box (2) is provided with a limiting hole matching the wind turbine blade body (1), two supporting rods (32) are provided between two opposing sides of the support box (2), a plurality of sliders (31) are slidably mounted between the two supporting rods (32), a scissor arm (33) is provided between two adjacent sliders (31), a nozzle (34) is provided at a horizontal section of the slider (31) away from the scissor arm (33), and the nozzle (34) is in contact with the wind turbine blade body (1). The nozzle (34) is matched with an electric blade body (1), the interface of the nozzle (34) is provided with a flow guide member (35), a driving assembly for adjusting the spacing between the plurality of sliders (31) is provided in the support box (2), a flow guide pipe (51) is provided between two opposing sides of the support box (2), a plurality of flow equalizing assemblies (52) are provided on the side wall of the flow guide pipe (51), a hose (53) is connected between the flow guide member (35) and adjacent flow equalizing assemblies (52), and a water pumping assembly is provided at the water inlet of the flow guide pipe (51); The driving assembly comprises a rotating shaft (41), the rotating shaft (41) passes through and is rotatably installed between two opposing sides of the supporting box (2), a threaded body (42) is provided on a side wall of the rotating shaft (41), the sliding block (31) near the limiting hole is threadedly connected to the rotating shaft (41) through the threaded body (42), two limiting rings (43) are provided on the side wall of the rotating shaft (41), the limiting rings (43) are fixedly sleeved with the rotating shaft (41), and the two limiting rings (43) are fitted on two opposing sides of the sliding block (31) away from the limiting hole, and a servo motor (44) is provided on one side of the supporting box (2), and an output shaft of the servo motor (44) is fixedly connected to the rotating shaft (41) through a coupling.

2. A wind turbine blade rain erosion testing device according to claim 1, characterized in that: Four universal pulleys (21) are arranged at the bottom end of the support box (2), two of which are provided with self-locking structures.

3. A wind turbine blade rain erosion testing device according to claim 1, characterized in that: A water inlet pipe (22) is provided on a side of the wind turbine blade body (1) away from the limiting hole, and the water inlet pipe (22) is located below the wind turbine blade body (1).

4. A wind turbine blade rain erosion testing device according to claim 3, characterized in that: The pumping assembly comprises a drainage tube (61), the drainage tube (61) passing through and fixedly mounted on a side of the support box (2) away from the limiting hole, a U-shaped tube (62) being arranged between the drainage tube (61) and the drainage pipe (51), a water pump (63) being arranged on the side wall of the U-shaped tube (62), and a filter screen (64) being mounted on a port of the drainage tube (61) located in the support box (2) via a fastener.

5. A wind turbine blade rain erosion testing device according to claim 4, characterized in that: The flow balancing assembly (52) comprises a support tube (71) and a sleeve (72); the support tube (71) penetrates and is fixedly connected to the drainage tube (51); the sleeve (72) is fixedly sleeved on the outer wall of the support tube (71); a plurality of drainage channels (73) are provided on the side wall of the support tube (71); a flow limiting plug (74) is slidably installed in the support tube (71); and a spring (75) is provided between the flow limiting plug (74) and the inner wall of one end of the support tube (71) away from the drainage tube (51).

6. A wind turbine blade rain erosion testing device according to claim 5, characterized in that: The cross section of the drainage channel (73) is in the shape of a rounded rectangle, and a plurality of partitions (76) are arranged in the drainage channel (73), wherein the partitions (76) are used to separate bubbles in the water flow.

7. A wind turbine blade rain erosion test method, applied to the wind turbine blade rain erosion test device according to claim 5, characterized in that: The following steps are involved: S1. Inserting the wind turbine blade body (1) into the support box (2) through the limiting hole, and auxiliary fixing the wind turbine blade body (1) by an external fixing device, wherein the end of the wind turbine blade body (1) is located in the support box (2); S2, water is injected into the support box (2) through the water inlet pipe (22), and then the water pump (63) pumps the water in the support box (2), and the water flows into the drainage pipe (51) through the drainage tube (61) and the U-shaped tube (62), and then is sprayed toward the wind turbine blade body (1) through multiple flow balancing components (52), the hose (53), the drainage member (35) and the nozzle (34), and the water flows from the drainage pipe (51) into the support tube (71), flows into the sleeve (72) through multiple drainage channels (73), and then flows into the hose (53), wherein the greater the water pressure, the more the flow limiting plug (74) squeezes the spring (75), and the flow area of ​​the drainage channel (73) increases linearly; S3, the servo motor (44) drives the rotating shaft (41) to rotate back and forth, and drives the slider (31) close to the limiting hole to slide back and forth between the two support rods (32) through the threaded body (42), and the two limiting rings (43) limit the slider (31) away from the limiting hole on the rotating shaft (41), and cooperate with the multiple scissor arms (33) to drive the spacing of the multiple sliders (31) to increase or decrease linearly, simulating the change of water flow rate received by the end of the wind turbine blade body (1) during operation in the rain.

8. A wind turbine blade rain erosion testing method according to claim 7, characterized in that: The water in the support box (2) is circulated and used, and the filter screen (64) cooperates with the drainage tube (61) to filter out debris or large-sized impurities in the water.

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