Out-field testing device for vertical axis wind turbine

Abstract

The invention discloses an external field testing device for a vertical axis wind turbine. The dumbbell plates with the T-shaped grooves are matched with the clamping grooves, and a multi-fan-blade structure can be flexibly arranged. A tester installs different numbers of connecting rods on the T-shaped chuck as required; two connecting rods with an included angle of 180 degrees are installed to carry out a double-fan-blade test; the included angles of the three blades are 120 degrees, so that a three-blade test is The included angles of the four blades are 90 degrees to complete a four-blade test; the included angle between the six blades is 60 degrees, and six-blade testing is supported. By adjusting the number of the connecting rods and fixing the connecting rods, the fan blade structure can be quickly changed, and the wind field test requirements of different fan blade numbers are met. And a push rod is eccentrically arranged on the turntable to adjust the attack angle of the fan blade. After the fixed wheel and the transmission rod are disconnected, the shifting wheel is rotated through the shifting rod to drive the rotating disc and the pushing rod to act, and the fan blades rotate around the connecting rod to change the attack angle. And pneumatic data under different attack angles can be obtained by adjusting the position of the turntable on the transmission rod, so that the test flexibility is further enhanced.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, specifically to a field testing device for a vertical axis wind turbine. Background Technology

[0002] With the development of the global economy, the demand for energy is constantly increasing, while traditional fossil fuel reserves are limited and unevenly distributed. Wind power, as a renewable energy source, can provide a new avenue for energy supply, reduce dependence on traditional fossil fuels, and alleviate energy shortages. Abundant wind energy resources are widely distributed, and developing wind power can diversify a country's or region's energy sources, reduce the risk of supply disruptions due to reliance on a single energy source or imported energy, and enhance the stability and security of energy supply.

[0003] Currently, wind power generation widely uses horizontal axis wind turbines and vertical axis wind turbines. Vertical axis wind turbines can adapt to winds of different directions, eliminating the yaw system present in traditional horizontal axis wind turbines. They have a simpler internal structure, but due to their mechanism and... With the rapid development of wind power technology, wind turbines are a crucial component of wind energy capture systems. Based on the direction of their shafts, wind turbines are categorized into vertical-axis and horizontal-axis turbines. Horizontal-axis wind turbines have experienced rapid development and reached technological maturity due to various factors, while vertical-axis wind turbines lag far behind due to their theoretical complexity, efficiency issues, and self-starting problems. However, vertical-axis wind turbines, with their advantages of not requiring wind input or complex yaw mechanisms, compact structure, and low noise, are increasingly widely used in distributed energy, microgrids, and wind energy development in challenging terrains.

[0004] However, performance optimization is highly dependent on accurate test data in the field environment, and existing test equipment is not adaptable enough to complex external environments, generally resulting in low monitoring accuracy. Test methods also largely rely on existing methods for horizontal axis wind turbines, which are insufficient to capture airflow characteristics in complex turbulent fields and cannot meet the needs of refined aerodynamic performance research. Summary of the Invention

[0005] The purpose of this invention is to provide a field testing device for vertical axis wind turbines, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a field testing device for a vertical axis wind turbine, comprising a transmission rod, A dumbbell disc is fixedly mounted on a transmission rod, with T-shaped chucks fixedly mounted on both sides. Each T-shaped chuck has several T-shaped grooves arranged in a circumferentially equidistant array. The inner surface of the T-shaped groove is in contact with the outer surface of the T-shaped block at one end of the connecting rod. The middle surface of the connecting rod is in contact with the inner surface of the groove at the edge of the dumbbell disc. The other end of the connecting rod is hinged to one side of the fan blade. A turntable is rotatably mounted on a transmission rod, and multiple push rods are eccentrically hinged to one end of the turntable. The upper surface of the turntable is sequentially fixed with a push wheel that is in contact with the outer surface of the transmission rod and a fixed wheel that is in contact with the outer surface of the transmission rod. The other end of the push rod is hinged to a driven plate fixedly mounted on the fan blade. The connection point between the push rod and the driven plate is close to the side of the driven plate. The lower surface of the turntable is in contact with the upper surface of the tray fixedly mounted on the transmission rod. A flange that is fixedly connected to one end of the transmission rod and whose shaft is fixedly mounted on its axis; The generator, speed sensor, and torque sensor are fixedly installed inside the test box and fixedly connected to the shaft.

[0007] Preferably, the T-shaped chuck is cylindrical, with a cover plate in contact with its upper surface. The cover plate has screw holes, and the T-shaped chuck has screw holes that correspond to the screw holes on the cover plate. The screw holes on the T-shaped chuck are located between each T-shaped groove.

[0008] Preferably, the connecting rods on both sides of the dumbbell disc are fixed by screw plates and screws. There are two screw plates, which are respectively connected to one side surface of the two connecting rods. Screw holes are provided on the screw plates. The two screw plates are fixed by screwing screws into the screw holes on the two screw plates.

[0009] Preferably, four through holes are provided on the surface of the actuating wheel at equal intervals around the circumference.

[0010] Preferably, a screw hole is provided on the surface of the fixed wheel, and a first fixing screw is screwed into the screw hole. One end of the first fixing screw is fixedly connected to one side of the arc-shaped contact plate, and the other side of the arc-shaped contact plate is in contact with the surface of the transmission rod.

[0011] Preferably, the dumbbell disc has several slots that are equidistantly mounted on the surface of the dumbbell disc, and the surface of the slots is provided with friction pads.

[0012] Preferably, the lower end of the test box is fixedly connected to one end of the upright, and the other end of the upright is fixedly set on the ground.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. This application, by setting a dumbbell-shaped disk with multiple T-slots and multiple slots, enables flexible configuration of multiple blades such as double-blade, three-blade, four-blade, and six-blade fans. It allows for field testing of vertical axis fans with different numbers of blades, greatly improving testing flexibility. The device operation is as follows: According to the test requirements, the tester installs a certain number of connecting rods into the T-shaped chuck. Two connecting rods are installed into the T-shaped chuck and T-slot, with the included angle between the two connecting rods being 180°. At this time, the test of double blades can be realized. Install three connecting rods into the T-shaped chuck and T-slot. The included angle between the three connecting rods is 120°, which enables the testing of three blades. Four connecting rods are installed in the T-shaped chuck and T-slot, with the included angle between the four connecting rods being 90°, which enables the testing of four blades; Six connecting rods are installed in the T-shaped chuck and T-slot, with the included angle between the six connecting rods being 60°, which enables the testing of six blades; By installing different numbers of connecting rods into the T-shaped chuck and T-slot, and fixing them with corresponding fixing components, the blade structure on the dumbbell disc can be changed, thereby enabling wind field testing of different blades and improving the flexibility of the test.

[0014] 2. This application uses an eccentrically mounted push rod on a turntable to change the angle of attack of the fan blades. The angle of attack of the fan blades changes accordingly based on the different rotation amplitudes of the turntable. By changing the angle of attack of the fan blades, data can be obtained at different angles of attack during testing. The specific input is as follows: First, disconnect the fixed wheel from the transmission rod. Insert the lever into the through hole inside the actuating wheel and rotate the actuating wheel clockwise or counterclockwise. The actuating wheel drives the turntable to rotate in the same direction. The turntable 301 drives one end of the push rod to move with it, and pulls or pushes the other end of the push rod to move. The other end of the push rod drives the fan blade to rotate around the connecting rod, thereby changing the angle of attack of the fan blade. After the fan blade rotates to the predetermined angle of attack, tighten the first fixing screw. The four arc-shaped contact plates 3032 clamp the transmission rod and fix the position of the turntable.

[0015] By rotating the adjustment turntable on the transmission rod, the installation angle of the fan blades can be changed through the transmission of the push rod, thereby obtaining aerodynamic data for different angles of attack and improving the flexibility of the device during testing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a vertical axis wind turbine field testing device according to the present invention; Figure 2 This is a schematic diagram of the dumbbell disk structure of a vertical axis wind turbine field testing device according to the present invention. The turntable is removed from this diagram. Figure 3 This is a schematic diagram of the T-shaped groove and slot structure on the dumbbell disk of a vertical axis wind turbine field testing device according to the present invention. The fan blades are removed from this diagram. Figure 4 for Figure 4 Enlarged view of a portion at point A; Figure 5 This is a schematic diagram of the fixed wheel structure of a vertical axis wind turbine field testing device according to the present invention; Figure 6 This is a schematic diagram of the connecting buckle structure of a vertical axis wind turbine field testing device according to the present invention; Figure 7 This is a schematic diagram of the connection position between the push rod and the driven plate of a vertical axis wind turbine field testing device according to the present invention; Figure 8 This is a schematic diagram of the internal structure of the test box of a vertical axis wind turbine field testing device according to the present invention.

[0017] In the diagram: 1. Transmission rod; 201. Dumbbell disc; 202. T-shaped chuck; 203. T-slot; 204. Connecting rod; 205. T-block; 206. Slot; 207. Fan blade; 208. Cover plate; 209. Screw plate; 210. Screw; 301. Turntable; 302. Actuating wheel; 303. Fixed wheel; 3031. First fixing screw; 3032. Arc-shaped contact plate; 304. Push rod; 305. Driven plate; 306. Tray; 307. Flange; 308. Connecting buckle; 3081. Screw sleeve; 3082. Second fixing screw; 3083. Base block; 4. Test box; 401. Generator; 402. Speed ​​sensor; 403. Torque sensor; 5. Shaft rod; 6. Vertical pole. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1-8 The present invention provides a technical solution: like Figure 2 As shown, to improve the flexibility of wind field testing, a vertical axis wind turbine field testing device is proposed, including a transmission rod 1. Two dumbbell disks 201 are coaxially fixedly connected to the surface of the transmission rod 1. The dumbbell disks 201 are cylindrical. A T-shaped chuck 202 is coaxially fixedly installed on each side surface of the dumbbell disks 201. The T-shaped chuck 202 is cylindrical. A cover plate 208 is in contact with the upper surface of each T-shaped chuck 202 and is connected to its lower surface. The cover plate 208 is provided with screw holes. The T-shaped chuck 202 is provided with screw holes that correspond to the screw holes on the cover plate 208. The screw holes on the T-shaped chuck 202 are located between each T-shaped groove 203. The connection and fixation of the cover plate 208 and the T-shaped chuck 202 can be achieved by screwing screws into the cover plate 208 and the T-shaped chuck 202.

[0020] like Figure 3 As shown: Each T-shaped chuck 202 has six T-shaped slots 203 arranged in a circumferentially equidistant array. The angle between each T-shaped slot 203 is 60 degrees. The inner surface of the T-shaped slot 203 is in contact with the outer surface of the T-shaped block 205. The shape of the T-shaped block 205 is the same as that of the T-shaped slot 203. The T-shaped block 205 can be placed in the T-shaped slot 203. By matching the shape of the T-shaped block 205 with the T-shaped slot 203, it is possible to prevent the T-shaped block 205 from detaching along the extension direction of the T-shaped slot 203. After the T-shaped block 205 is placed in the T-shaped slot 203, the cover plate 208 is fixed to the T-shaped chuck 202 with bolts. The lower surface of the cover plate 208 is in contact with the upper surface of the T-shaped block 205. The cover plate 208 can prevent the T-shaped block 205 from detaching from the T-shaped slot 203 along the extension direction of the transmission rod 1.

[0021] One end of the T-shaped block 205 is fixedly connected to one end of the connecting rod 204. The middle surface of the connecting rod 204 is in contact with the inner surface of the slot 206. The overall structure of the slot 206 is two rectangular fixed blocks, the width between which is the same as the width of the connecting rod 204. There are six slots 206, which are radially fixed on the surface of the dumbbell disc 201 in a circumferentially equidistant arrangement. The surface of the slot 206 is provided with friction pads, which can increase the friction between the slot 206 and the connecting rod 204. When the connecting rod 204 is engaged in the slot 206, the slot 206 can restrict the middle position of the connecting rod 204, prevent the connecting rod 204 from deviating from its position, and improve the stability of the connecting rod 204 during operation. The other end of the connecting rod 204 is hinged to one side surface of the fan blade 207.

[0022] Each dumbbell disc 201 has two sets of connecting rods 204 on both sides, which are in the same position. The two sets of connecting rods 204 are fixed together by screw plates 209 and screws 210. There are two screw plates 209, which are respectively connected to one side surface of the two connecting rods 204. There are four screw holes on the screw plates 209. The two screw plates 209 are fixed by screwing four screws 210 into the screw holes on the two screw plates 209. The installation position of the screw plates 209 is close to the connection end between the connecting rods 204 and the fan blades 207. The clamping of the two screw plates 209 and the screws 210 can improve the stability of the two connecting rods 206 when working at the fan blades 207.

[0023] In this embodiment, the T-shaped chuck 202, T-slot 203, and connecting rod 206 are detachably connected. The T-shaped chuck 202 and T-slot 203 are installed at equal intervals, allowing testers to flexibly select the number of fan blades 207 according to testing needs. This supports the installation of multi-blade vertical axis fan field testing devices, including double-blade, three-blade, four-blade, and six-blade models. When two connecting rods 206 are installed in the T-shaped chuck 202 and T-slot 203 with an included angle of 180°, testing of double-blade fans can be achieved. Three connecting rods 206 are installed in the T-shaped chuck 202 and T-shaped groove 203, with the included angle between the edges of the three connecting rods 206 being 120°, which enables the testing of three blades; four connecting rods 206 are installed in the T-shaped chuck 202 and T-shaped groove 203, with the included angle between the edges of the four connecting rods 206 being 90°, which enables the testing of four blades; six connecting rods 206 are installed in the T-shaped chuck 202 and T-shaped groove 203, with the included angle between the edges of the six connecting rods 206 being 60°, which enables the testing of six blades; this allows for wind field testing of different blades, improving the flexibility of the testing.

[0024] like Figure 4 As shown: In order to realize the change of the angle of attack of the fan blade 207, a field test device for a vertical axis wind turbine is proposed. A turntable 301 is rotatably mounted on the surface of the transmission rod 1. The turntable 301 is coaxially mounted with the transmission rod 1 and is located between two dumbbell discs 201. Its installation position corresponds to the middle position of the fan blade 207.

[0025] The upper surface of the turntable 301 is coaxially fixedly connected to the actuating wheel 302. The lower surface of the actuating wheel 302 is fixedly connected to the upper surface of the turntable 301. The actuating wheel 302 is annular in shape, and its inner surface is in contact with the surface of the transmission rod 206. The surface of the actuating wheel 302 is provided with four through holes at equal intervals around the circumference. By inserting a lever into the through holes on the actuating wheel 302 and rotating the actuating wheel 302 clockwise, the turntable 301 can be driven to rotate around the transmission rod 206 as the center.

[0026] like Figure 5As shown: A fixed wheel 303 is coaxially fixed on the upper surface of the actuating wheel 302. The fixed wheel 303 is circular in shape, with a circumference smaller than that of the actuating wheel 302. The inner surface of the fixed wheel 303 is in contact with the surface of the transmission rod 206. Four equally spaced screw holes are provided on the surface of the fixed wheel 303. A first fixing screw 3031 is screwed into each screw hole. One end of the first fixing screw 3031 is rotatably connected to one side of the arc-shaped contact plate 3032. The other side of the arc-shaped contact plate 3032 is in contact with the surface of the transmission rod 1. The arc-shaped contact plate 3032 is slidably installed inside the fixed wheel 303. A groove corresponding to the arc-shaped contact plate 3032 is provided inside the fixed wheel 303. In the initial state, the first fixing screw 3031... The screws are tightened into the screw holes on the actuating wheel 302, and the arc-shaped contact plates 3032 are in contact with the surface of the transmission rod 1. The position of the fixed wheel 303 can be fixed by the clamping of the four arc-shaped contact plates 3032 and the connecting rod 206, thereby fixing the position of the actuating wheel 302. When it is necessary to rotate the actuating wheel 302, the screws are turned in the opposite direction and the first fixing screw 3031 is gradually loosened. The first fixing screw 3031 moves away from the transmission rod 206 and drives the arc-shaped contact plates 3032 to move in the same direction. After the arc-shaped contact plates 3032 move, they lose their connection with the transmission rod 1. At this time, the four arc-shaped contact plates 3032 no longer clamp the transmission rod 1, and the fixed wheel 303 and the actuating wheel 302 can rotate.

[0027] Six push rods 304 are mounted circumferentially at the eccentric position of the turntable 301, each hinged at one end via a connecting buckle 308. Each push rod 304 corresponds to one of six T-slots 203. The turntable 301 has through holes corresponding to the connecting buckles 308. The connecting buckles 308 are detachable, and a threaded sleeve 3081 is fixedly connected to the surface of the connecting buckle 308. The threaded sleeve 3081 is screwed to a second fixing screw 3082. A base block 3083 is coaxially fixedly connected to the surface of the threaded sleeve 3081. One end of each push rod 304 is located between the connecting buckle 308 and the base block 3083, allowing the push rod 304 to rotate around the base block 3083 (e.g., ...). Figure 6 As shown, when it is necessary to install the push rod 304 on the turntable 301, the screw sleeve 3081 is passed through the through hole on the turntable 301, the second fixing screw 3082 is screwed in and tightened. The push rod 304 can be disassembled and installed through the connecting buckle 308. The same number of push rods 304 can be installed according to the number of fan blades 207 installed.

[0028] The lower surface of the turntable 301 is in contact with the upper surface of the tray 306, which is fixedly installed on the transmission rod 1. The tray 306 is coaxially fixed with the transmission rod 1, and the tray 306 can prevent the turntable 301 from slipping.

[0029] The other end of the push rod 304 is hinged to the surface of the driven plate 305. The connection point between the push rod 304 and the driven plate 305 is at a location other than the center line of the driven plate 305. The driven plate 305 is fixedly mounted on the center line of the surface of the fan blade 207 (e.g., Figure 7 (As shown).

[0030] When the angle of the fan blade 207 needs to be adjusted, first loosen the first fixing screw 3031, so that the arc-shaped contact plate 3032 loses contact with the transmission rod 1. Insert the lever into the through hole in the actuating wheel 302 and rotate the actuating wheel 302 clockwise or counterclockwise. The actuating wheel 302 drives the turntable 301 to rotate in the same direction. The turntable 301 drives one end of the push rod 304 to move with it and pulls or pushes the other end of the push rod 304 to move. The other end of the push rod 304 drives the fan blade 207 to rotate around the connecting rod 204, thereby changing the angle of attack of the fan blade 207. After the fan blade 207 rotates to the predetermined angle of attack, tighten the first fixing screw 3031. The four arc-shaped contact plates 3032 clamp the transmission rod 1 and fix the position of the turntable 301.

[0031] One end of the transmission rod 1 is fixedly connected to the flange 307, and the other end of the flange 307 is coaxially fixedly connected to one end of the shaft rod 5. The other end of the shaft rod 5 extends into the test chamber 4, and its surface is rotatably connected to the inside of the test chamber 4. One end of the shaft rod 5 extending into the test chamber 4 is fixedly connected to the input end of the generator 401. The rotor of the generator 401 is fixedly connected to the shaft rod 5. The rotor magnetic poles cut the magnetic field lines of the stator winding to generate three-phase alternating current. A speed sensor 402 and a torque sensor 403 are fixedly installed inside the test chamber 4 and fixedly connected to the shaft rod 5. The speed and torque of the shaft rod 5 are tested by the speed sensor 402 and the torque sensor 403 (shown in the figure). Figure 8 ).

[0032] The lower end of the test box 4 is fixedly connected to one end of the upright 6, and the other end of the upright 6 is fixedly set on the ground.

[0033] Working principle: First, the device is placed on the ground using the upright pole 6. The tester installs a certain number of connecting rods 204 into the T-shaped chuck 202 according to the test requirements. Two connecting rods 206 are then installed into the T-shaped chuck 202 and T-slot 203, with an angle of 180° between their edges, enabling testing of the double-blade design. Three connecting rods 206 are then installed into the T-shaped chuck 202 and T-slot 203, with an angle of 120° between their edges, enabling testing of the three-blade design. Test: Install four connecting rods 206 into the T-shaped chuck 202 and T-shaped groove 203, with the included angle between the four connecting rods 206 being 90°, which enables the testing of four blades; install six connecting rods 206 into the T-shaped chuck 202 and T-shaped groove 203, with the included angle between the six connecting rods 206 being 60°, which enables the testing of six blades; thereby realizing the wind field testing of different blades, improving the testing flexibility, and obtaining test data through the speed sensor 402 and torque sensor 403.

[0034] When it is necessary to change the angle of attack of the fan blade 207 and obtain test data for different angles of attack of the fan blade 207, first loosen the first fixing screw 3031, so that the arc-shaped contact plate 3032 loses contact with the transmission rod 1. Insert the lever into the through hole in the actuation wheel 302 and rotate the actuation wheel 302 clockwise or counterclockwise. The actuation wheel 302 drives the turntable 301 to rotate in the same direction. The turntable 301 drives one end of the push rod 304 to move with it and pulls or pushes the other end of the push rod 304 to move. The other end of the push rod 304 drives the fan blade 207 to rotate around the connecting rod 204, thereby changing the angle of attack of the fan blade 207. After the fan blade 207 rotates to the predetermined angle of attack, tighten the first fixing screw 3031. The four arc-shaped contact plates 3032 clamp the transmission rod 1 and fix the position of the turntable 301. Test data is obtained through the speed sensor 402 and the torque sensor 403.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A field testing device for a vertical axis wind turbine, comprising a transmission rod (1), characterized in that: A dumbbell disc (201) is fixedly installed on the transmission rod (1) and has T-shaped chucks (202) fixedly installed on both sides. Each T-shaped chuck (202) has several T-shaped grooves (203) arranged in a circumferentially equidistant array. The inner surface of the T-shaped groove (203) is in contact with the outer surface of the T-shaped block (205) at one end of the connecting rod (204). The middle surface of the connecting rod (204) is in contact with the inner surface of the groove (206) at the edge of the dumbbell disc (201). The other end of the connecting rod (204) is hinged to one side surface of the fan blade (207). A turntable (301) is rotatably mounted on a transmission rod (1) and eccentrically hinged to one end of a plurality of push rods (304). The upper surface of the turntable (301) is sequentially fixed with a push wheel (302) that is in contact with the outer surface of the transmission rod (1) and a fixed wheel (303) that is in contact with the outer surface of the transmission rod (1). The other end of the push rod (304) is hinged to a driven plate (305) fixedly mounted on a fan blade (207). The connection point between the push rod (304) and the driven plate (305) is close to the side of the driven plate (305). The lower surface of the turntable (301) is in contact with the upper surface of a tray (306) fixedly mounted on the transmission rod (1). A flange (307) is fixedly connected to one end of the transmission rod (1) and the shaft rod (5) is fixedly installed on its axis. A generator (401), a speed sensor (402), and a torque sensor (403) are fixedly installed inside the test box (4) and fixedly connected to the shaft rod (5).

2. The field testing device for a vertical axis wind turbine according to claim 1, characterized in that: The T-shaped chuck (202) is cylindrical, and its upper surface is connected to a cover plate (208). The cover plate (208) is provided with screw holes, and the T-shaped chuck (202) is provided with screw holes that correspond to the screw holes on the cover plate (208). The screw holes on the T-shaped chuck (202) are located between each T-shaped groove (203).

3. The field testing device for a vertical axis wind turbine according to claim 1, characterized in that: The connecting rods (204) on both sides of the dumbbell disc (201) are fixed by screw plates (209) and screws (210). There are two screw plates (209), which are respectively connected to one side surface of the two connecting rods (204). Screw holes are provided on the screw plates (209). The two screw plates (209) are fixed by screwing the screws (210) into the screw holes on the two screw plates (209).

4. The field testing device for a vertical axis wind turbine according to claim 1, characterized in that: The surface of the actuating wheel (302) has four through holes arranged at equal intervals around the circumference.

5. The field testing device for a vertical axis wind turbine according to claim 1, characterized in that: The fixed wheel (303) has a screw hole on its surface, and a first fixing screw (3031) is screwed into the screw hole. One end of the first fixing screw (3031) is fixedly connected to one side of the arc-shaped contact plate (3032), and the other side of the arc-shaped contact plate (3032) is in contact with the surface of the transmission rod (1).

6. The field testing device for a vertical axis wind turbine according to claim 1, characterized in that: The dumbbell disc (201) is provided with a number of slots (206) and is installed circumferentially on the surface of the dumbbell disc (201). The surface of the slots (206) is provided with friction pads.

7. The field testing device for a vertical axis wind turbine according to claim 1, characterized in that: The lower end of the test box (4) is fixedly connected to one end of the upright (6), and the other end of the upright (6) is fixedly set on the ground.

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