Cabin transformer of circulating water-cooled wind power tower

Abstract

The invention discloses a circulating water-cooled wind power tower cabin transformer, which comprises a transformer main body, a controller, a communicator, a mounting rack and a liquid spraying mechanism, and is characterized in that the transformer main body is arranged on the mounting rack; the water tank is provided with a water inlet pipe and a telescopic hose, and the water inlet pipe is provided with a first pump body; the end, away from the water tank, of the telescopic hose communicates with the liquid spraying mechanism. The controller is electrically connected with the liquid spraying mechanism and the communicator. The communicator is used for obtaining meteorological data and sending the meteorological data to the controller. The controller is used for determining the real-time wind direction according to the meteorological data and controlling the liquid spraying mechanism according to the real-time wind direction, and a water curtain is formed on the side, facing the real-time wind direction, of the transformer body. According to the technical scheme, the real-time risk is determined according to the weather condition of the ocean area where the wind power generator is located, so that external wind power cools the transformer body through the water curtain, seawater is fully utilized for cooling the transformer body, and the heat dissipation efficiency of the transformer body is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a circulating water-cooled wind power tower cabin transformer. Background Art

[0002] The basic principle of wind power generation is to convert wind kinetic energy into mechanical energy through a wind turbine, which then converts the mechanical energy into electrical energy. A wind turbine typically consists of a tower, blades, a gearbox, and a generator. When wind blows over the blades, they rotate, converting the wind energy into mechanical energy. This process is then converted into electrical energy by a generator connected to the blades. Offshore wind power generation utilizes wind energy resources on the ocean to generate electricity. The biggest difference between offshore wind power generation and onshore wind power generation is that offshore wind power generation utilizes the ocean as a significant cooling source, effectively assisting in the heat dissipation of the transformer in the wind turbine. However, existing offshore wind turbines are essentially the same as onshore wind turbines. The only difference is that offshore wind turbines require a support base to secure them to sea level. Existing offshore wind turbines do not effectively utilize this significant cooling source to assist in their heat dissipation, resulting in low heat dissipation efficiency. Summary of the Invention

[0003] The main purpose of the present invention is to provide a circulating water-cooled wind turbine tower cabin transformer, which aims to solve the problem that existing offshore wind turbines do not effectively utilize the ocean for heat dissipation, resulting in low heat dissipation efficiency.

[0004] To achieve the above object, the technical solution proposed by the present invention is:

[0005] A circulating water-cooled wind turbine tower cabin transformer, comprising a transformer body, a controller, a communicator, a mounting frame and a liquid spraying mechanism, wherein the transformer body is arranged on the mounting frame, and the mounting frame is used to fix the transformer body to the bracket base of the tower; the mounting frame is also provided with a water tank, and the water tank is respectively provided with a water inlet pipe and a telescopic hose, the water inlet pipe is provided with a first pump body, and the end of the water inlet pipe away from the water tank is used to extend into the ocean; the first pump body is used to send seawater into the water tank through the water inlet pipe; the liquid spraying mechanism is arranged around the transformer body, and the end of the telescopic hose away from the water tank is connected to the liquid spraying mechanism, and the liquid spraying mechanism is used to drive the water in the water tank to form a water curtain on the outside of the transformer body; the controller is electrically connected to the liquid spraying mechanism and the communicator respectively, and the communicator is used to obtain meteorological data and send it to the controller; the controller is used to determine the real-time wind direction according to the meteorological data, and control the liquid spraying mechanism according to the real-time wind direction to form a water curtain on the side of the transformer body facing the real-time wind direction.

[0006] Preferably, the mounting frame is provided with a base and a top plate, the base and the top plate are arranged in parallel and spaced apart, and the base and the top plate are respectively used to connect to the bracket base of the electric tower; the transformer body is arranged on the side of the base facing the top plate; the spray mechanism and the water tank are both arranged on the side of the top plate away from the base; the water inlet pipe is located on the same side of the base and the top plate.

[0007] Preferably, a water storage tank is provided on the side of the base facing the top plate, a fixing bracket is provided in the water storage tank, and the transformer body is provided on the fixing bracket; a drain outlet is provided on the groove wall of the water storage tank, and the drain outlet is provided close to the groove opening of the water storage tank, and the horizontal height of the drain outlet is lower than the side of the fixing bracket on which the transformer body is installed; a water flow space is formed between the fixing bracket and the groove wall of the water storage tank, and a water curtain formed by spraying by the liquid spraying mechanism passes through the water flow space and enters the water storage tank.

[0008] Preferably, the fixing frame is further provided with a fan, and the fan is located between the drain outlet and the transformer body.

[0009] Preferably, the top plate is provided with an operating through hole along the plate thickness, and the transformer body is located in the vertical projection area of the operating through hole toward the base; a first slide rail is provided on the hole wall of the operating through hole, the first slide rail is provided around the transformer body, and the first slide rail slides to provide a first electrically controlled slide, and the first electrically controlled slide drives and connects to the liquid spraying mechanism; the controller is electrically connected to the first electrically controlled slide, and the controller is used to control the first electrically controlled slide to drive the liquid spraying mechanism to move according to real-time risk.

[0010] Preferably, the spray mechanism includes a first mounting seat, a second slide rail and a sprayer, the first electrically-controlled slide is driven and connected to the first mounting seat, the second slide rail is arranged on the side of the first mounting seat away from the first electrically-controlled slide, and the second slide rail is parallel to the top plate; the second slide rail slides to set the second electrically-controlled slide; the sprayer is located on the side of the second electrically-controlled slide away from the second slide rail, and the second electrically-controlled slide is driven and connected to the sprayer; the movement trajectory of the first electrically-controlled slide driving the sprayer through the first mounting seat and the movement trajectory of the second electrically-controlled slide driving the sprayer are both arranged around the transformer body; the controller is electrically connected to the sprayer and the second electrically-controlled slide, and the controller is used to control the second electrically-controlled slide to drive the sprayer to move back and forth along the second track when the first electrically-controlled slide drives the sprayer to move to the side of the transformer body facing the real-time wind direction.

[0011] Preferably, the sprayer includes a fan-shaped nozzle, a second mounting seat and a connecting water pipe, and the fan-shaped nozzle and the connecting water pipe are both arranged on the second mounting seat; the second mounting seat is located on the side of the second electrically-controlled slide away from the second slide rail, and the second electrically-controlled slide drives the connection to the second mounting seat; the fan-shaped nozzle is arranged on the side of the second mounting seat facing the water flow space; one end of the connecting water pipe is connected to the fan-shaped nozzle, and the other end of the connecting water pipe is connected to the end of the telescopic hose away from the water tank, and the connecting water pipe is provided with a second pump body, and the second pump body is used to drive the water in the water tank to pass through the telescopic hose and the connecting water pipe in turn, and sprayed from the fan-shaped nozzle to the water flow space; the controller is electrically connected to the second pump body, and the controller is used to control the opening and closing of the second pump body.

[0012] Preferably, a screening box is provided on the side of the water inlet pipe away from the water tank, and the screening box is used to sink to the seabed; the screening box has a water inlet filter hole, and a sonar fish-repelling device is provided on the side of the screening box where the water inlet filter hole is provided.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects:

[0014] The real-time risk is determined based on the weather conditions in the ocean area where the wind turbine is located, so that the external wind can cool the transformer body through the water curtain, making full use of the seawater to cool the transformer body and improve the heat dissipation efficiency of the transformer body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0016] Figure 1 This is a structural schematic diagram of an embodiment of a circulating water-cooled wind turbine tower cabin transformer according to the present invention;

[0017] Figure 2 Schematic diagram of the structure of the mounting frame;

[0018] Figure 3 for Figure 2 The schematic diagram of the structure after enlarging A in the middle;

[0019] Figure 4 Schematic diagram of the structure of the screening box.

[0020] Description of Figure Numbers:

[0021] 1-mounting frame; 11-base; 12-top plate; 13-water tank; 14-fixing frame; 15-drain outlet; 16-fan; 17-operation hole; 18-first slide rail; 19-first electric control slide;

[0022] 2- Transformer body;

[0023] 3-liquid spray mechanism; 31-first mounting seat; 32-second slide rail; 33-second electric control slide; 34-fan-shaped spray nozzle; 35-second mounting seat; 36-connecting water pipe; 37-second pump body;

[0024] 4-water tank; 41-water inlet pipe; 42-first pump body; 43-screening box; 44-water inlet filter hole; 45-rotating shaft; 46-brush body; 47-servo motor;

[0025] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0029] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0030] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] The present invention provides a circulating water-cooled wind power tower cabin transformer.

[0032] like Figures 1 to 4 A circulating water-cooled wind turbine tower nacelle transformer is shown, comprising a transformer body 2, a controller, a communicator, a mounting frame 1, and a liquid spraying mechanism 3. The transformer body 2 is mounted on the mounting frame 1, which is used to secure the transformer body 2 to the support base of the tower. The mounting frame 1 is also provided with a water tank 4, which is provided with a water inlet pipe 41 and a telescopic hose (not shown). The water inlet pipe 41 is provided with a first pump body 42, and the end of the water inlet pipe 41 away from the water tank 4 is configured to extend into the ocean. The first pump body 42 is configured to deliver seawater into the water tank 4 through the water inlet pipe 41. The liquid spraying mechanism 3 is disposed around the transformer body 2, and the end of the telescopic hose away from the water tank 4 is connected to the liquid spraying mechanism 3. The liquid spraying mechanism 3 is configured to drive the water in the water tank 4 to form a water curtain outside the transformer body 2. The controller is electrically connected to the liquid spraying mechanism 3 and the communicator, respectively, and the communicator is configured to obtain meteorological data and transmit it to the controller. The controller is configured to determine the real-time wind direction based on the meteorological data and control the liquid spraying mechanism 3 based on the real-time wind direction to form a water curtain on the side of the transformer body 2 facing the real-time wind direction.

[0033] The real-time risk is determined according to the weather conditions in the ocean area where the wind turbine is located, so that the external wind cools the transformer body 2 through the water curtain, making full use of the seawater to cool the transformer body 2 and improving the heat dissipation efficiency of the transformer body 2.

[0034] Specifically, the controller is used to determine the wind force level and real-time risk based on meteorological data, and to determine whether the wind force level is greater than or equal to a preset level. When the wind force level is greater than or equal to the preset level, the controller controls the spray mechanism 3 to spray a water curtain toward the side of the transformer body 2 that faces away from the real-time wind direction. When the wind force level is less than the preset level, the controller controls the spray mechanism 3 to spray the water curtain toward the direction between the transformer body 2 and the real-time wind direction. When the wind force level is greater than the preset level, the wind force may blow the water curtain toward the outer surface of the transformer body 2. Therefore, the direction of the water curtain is adjusted to prevent a large amount of water from adhering to the outer surface of the transformer body 2 due to excessive wind force.

[0035] The mounting frame 1 comprises a base 11 and a top plate 12, which are arranged parallel and spaced apart. The base 11 and top plate 12 are each used to connect to the support base of the power tower. The transformer body 2 is located on the side of the base 11 facing the top plate 12. The spray mechanism 3 and water tank 4 are both located on the side of the top plate 12 facing away from the base 11. The water inlet pipe 41 is located on the same side of the base 11 and top plate 12. The base 11 and top plate 12 are both fixed to the support base on the side facing away from the power tower by welding.

[0036] A water tank 13 is provided on the side of the base 11 facing the top plate 12, a fixing frame 14 is provided in the water tank 13, and the transformer body 2 is provided on the fixing frame 14; a drain outlet 15 is provided on the wall of the water tank 13, and the drain outlet 15 is provided close to the slot of the water tank 13, and the horizontal height of the drain outlet 15 is lower than the side of the fixing frame 14 where the transformer body 2 is installed; a water flow space is formed between the fixing frame 14 and the wall of the water tank 13, and the water curtain formed by the spraying mechanism 3 passes through the water flow space and enters the water tank 13. The water tank 13 collects the water that forms the water curtain to prevent the water from flowing randomly. The location of the water tank 13 and the drain outlet 15 can ensure that the cold source formed by more water is close to the transformer body 2, further assisting in heat dissipation.

[0037] Specifically, a liquid level sensor is provided within the water tank 13 and is electrically connected to a controller. The sensor is used to detect the liquid level within the water tank 13 and transmit the data to the controller. When the wind speed is greater than or equal to a preset level, the controller determines whether the liquid level data is greater than or equal to a preset height. If the liquid level data is greater than or equal to the preset height, the controller controls the liquid spray mechanism 3 to shut down. When the liquid level data is less than the preset height, the controller controls the liquid spray mechanism 3 to spray a water curtain toward the side of the transformer body 2 facing away from the real-time wind direction. When the wind speed is too high, spraying a water curtain is unnecessary; it is sufficient to ensure that a certain volume of water remains within the water tank 13.

[0038] The fixing frame 14 is further provided with a fan 16, which is located between the drain port 15 and the transformer body 2. The provision of the fan 16 can assist the transformer body 2 in dissipating heat when the wind level is too low.

[0039] A work hole 17 is defined along the thickness of the top plate 12. The transformer body 2 is located within the vertical projection of the work hole 17 toward the base 11. A first slide rail 18 is provided on the wall of the work hole 17. The first slide rail 18 surrounds the transformer body 2 and slides over a first electrically controlled slide 19, which drives and connects to the liquid spraying mechanism 3. A controller is electrically connected to the first electrically controlled slide 19 and controls the movement of the first electrically controlled slide 19 based on real-time risk. The first slide rail 18, which surrounds the transformer body 2, is formed within the work hole 17. The first electrically controlled slide 19 drives the liquid spraying mechanism 3 to form a water curtain on the side of the transformer body 2 facing the real-time wind direction.

[0040] The spray mechanism 3 includes a first mounting seat 31, a second slide rail 32 and a sprayer. The first electrically-controlled slide 19 is driven and connected to the first mounting seat 31. The second slide rail 32 is arranged on the side of the first mounting seat 31 away from the first electrically-controlled slide 19, and the second slide rail 32 is parallel to the top plate 12; the second slide rail 32 is slidingly arranged with a second electrically-controlled slide 33; the sprayer is located on the side of the second electrically-controlled slide 33 away from the second slide rail 32, and the second electrically-controlled slide 33 is driven and connected to the sprayer; the movement trajectory of the sprayer driven by the first electrically-controlled slide 19 through the first mounting seat 31 and the movement trajectory of the sprayer driven by the second electrically-controlled slide 33 are both arranged around the transformer body 2; the controller is electrically connected to the sprayer and the second electrically-controlled slide 33, and the controller is used to control the second electrically-controlled slide 33 to drive the sprayer to move back and forth along the second track when the first electrically-controlled slide 19 drives the sprayer to move to the side of the transformer body 2 facing the real-time wind direction. The second electrically controlled slide 33 drives the sprayer to run back and forth to form an S-shaped water curtain, which can ensure that the external wind can pass through the water curtain and can also ensure the cooling effect of the water curtain on the external wind.

[0041] The sprayer includes a fan-shaped nozzle 34, a second mounting seat 35 and a connecting water pipe 36, and the fan-shaped nozzle 34 and the connecting water pipe 36 are both arranged on the second mounting seat 35; the second mounting seat 35 is located on the side of the second electrically-controlled slide 33 away from the second slide rail 32, and the second electrically-controlled slide 33 drives the connection to the second mounting seat 35; the fan-shaped nozzle 34 is arranged on the side of the second mounting seat 35 facing the water flow space; one end of the connecting water pipe 36 is connected to the fan-shaped nozzle 34, and the other end of the connecting water pipe 36 is connected to the end of the telescopic hose away from the water tank 4, and the connecting water pipe 36 is provided with a second pump body 37, which is used to drive the water in the water tank 4 to pass through the telescopic hose and the connecting water pipe 36 in sequence, and be sprayed into the water flow space by the fan-shaped nozzle 34; the controller is electrically connected to the second pump body 37, and the controller is used to control the opening and closing of the second pump body 37.

[0042] A screening box 43 is provided on the side of the water inlet pipe 41 away from the water tank 4, and the screening box 43 is used to sink to the seabed; a water inlet filter hole 44 is provided in the screening box 43, and a sonar fish repelling device is provided on the side of the water inlet filter hole 44.

[0043] Specifically, a filter is provided at one end of the water inlet pipe 41 connected to the screen box 43. The provision of the water inlet filter hole 44 and the filter can further reduce the probability of external impurities entering the water tank 4, effectively reducing the maintenance frequency.

[0044] Specifically, a rotating shaft 45 is provided on one side of the screening box 43 where the water inlet filter hole 44 is opened, and a servo motor 47 is provided in the screening box 43. The output end of the servo motor 47 drives the end of the rotating shaft 45 connected to extend into the screening box 43; a brush body 46 is provided on the outside of the screening box 43, and the end of the rotating shaft 45 away from the servo motor 47 drives the brush body 46; the water inlet filter hole 44 is arranged around the rotating shaft 45; the controller is electrically connected to the servo motor 47, and the controller is used to control the servo motor 47 to drive the brush body 46 to rotate so that the brush body 46 cleans the water inlet filter hole 44.

[0045] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A circulating water-cooled wind turbine tower nacelle transformer, characterized in that: The utility model comprises a transformer body, a controller, a communicator, a mounting frame and a liquid spraying mechanism, wherein the transformer body is arranged on the mounting frame, and the mounting frame is used to fix the transformer body to the bracket base of the power tower; the mounting frame is also provided with a water tank, and the water tank is respectively provided with a water inlet pipe and a telescopic hose, the water inlet pipe is provided with a first pump body, and the end of the water inlet pipe away from the water tank is used to extend into the ocean; the first pump body is used to send seawater into the water tank through the water inlet pipe; the liquid spraying mechanism is arranged around the transformer body, and the end of the telescopic hose away from the water tank is connected to the liquid spraying mechanism, and the liquid spraying mechanism is used to drive the water in the water tank to form a water curtain on the outside of the transformer body; the controller is electrically connected to the liquid spraying mechanism and the communicator respectively, and the communicator is used to obtain meteorological data and send it to the controller; the controller is used to determine the real-time wind direction according to the meteorological data, and control the liquid spraying mechanism according to the real-time wind direction to form a water curtain on the side of the transformer body facing the real-time wind direction.

2. A circulating water-cooled wind turbine tower nacelle transformer according to claim 1, characterized in that: The mounting frame is provided with a base and a top plate, the base and the top plate are arranged in parallel and spaced apart, and the base and the top plate are respectively used to connect to the bracket base of the power tower; the transformer body is arranged on the side of the base facing the top plate; the spray mechanism and the water tank are both arranged on the side of the top plate away from the base; the water inlet pipe is located on the same side of the base and the top plate.

3. A circulating water-cooled wind turbine tower nacelle transformer according to claim 2, characterized in that: A water storage tank is provided on the side of the base facing the top plate, a fixing bracket is provided in the water storage tank, and the transformer body is provided on the fixing bracket; a drain outlet is provided on the groove wall of the water storage tank, and the drain outlet is provided close to the groove opening of the water storage tank, and the horizontal height of the drain outlet is lower than the side of the fixing bracket on which the transformer body is installed; a water flow space is formed between the fixing bracket and the groove wall of the water storage tank, and a water curtain formed by spraying by the liquid spraying mechanism passes through the water flow space and enters the water storage tank.

4. A circulating water-cooled wind turbine tower nacelle transformer according to claim 3, characterized in that: The fixing frame is further provided with a fan, and the fan is located between the drain port and the transformer body.

5. A circulating water-cooled wind turbine tower nacelle transformer according to claim 3 or 4, characterized in that: The top plate is provided with an operating hole along the thickness of the plate, and the transformer body is located in the vertical projection area of the operating hole toward the base; a first slide rail is provided on the hole wall of the operating hole, and the first slide rail is provided around the transformer body, and a first electrically controlled slide is provided for sliding on the first slide rail, and the first electrically controlled slide is driven and connected to the liquid spraying mechanism; the controller is electrically connected to the first electrically controlled slide, and the controller is used to control the first electrically controlled slide to drive the liquid spraying mechanism to move according to real-time risk.

6. The circulating water-cooled wind turbine tower nacelle transformer according to claim 5, characterized in that: The spray mechanism includes a first mounting seat, a second slide rail and a sprayer, the first electrically-controlled slide is driven and connected to the first mounting seat, the second slide rail is arranged on the side of the first mounting seat away from the first electrically-controlled slide, and the second slide rail is parallel to the top plate; the second slide rail slides and the second electrically-controlled slide are slidably arranged; the sprayer is located on the side of the second electrically-controlled slide away from the second slide rail, and the second electrically-controlled slide is driven and connected to the sprayer; the movement trajectory of the sprayer driven by the first electrically-controlled slide through the first mounting seat and the movement trajectory of the sprayer driven by the second electrically-controlled slide are both arranged around the transformer body; the controller is electrically connected to the sprayer and the second electrically-controlled slide, and the controller is used to control the second electrically-controlled slide to drive the sprayer to move back and forth along the second track when the first electrically-controlled slide drives the sprayer to move to the side of the transformer body facing the real-time wind direction.

7. The circulating water-cooled wind turbine tower nacelle transformer according to claim 6, characterized in that: The sprayer includes a fan-shaped nozzle, a second mounting seat and a connecting water pipe, and the fan-shaped nozzle and the connecting water pipe are both arranged on the second mounting seat; the second mounting seat is located on the side of the second electrically-controlled slide away from the second slide rail, and the second electrically-controlled slide drives the connection to the second mounting seat; the fan-shaped nozzle is arranged on the side of the second mounting seat facing the water flow space; one end of the connecting water pipe is connected to the fan-shaped nozzle, and the other end of the connecting water pipe is connected to the end of the telescopic hose away from the water tank, and the connecting water pipe is provided with a second pump body, and the second pump body is used to drive the water in the water tank to pass through the telescopic hose and the connecting water pipe in turn, and be sprayed from the fan-shaped nozzle to the water flow space; the controller is electrically connected to the second pump body, and the controller is used to control the opening and closing of the second pump body.

8. A circulating water-cooled wind turbine tower nacelle transformer according to any one of claims 1 to 4, characterized in that: A screening box is arranged on a side of the water inlet pipe away from the water tank, and the screening box is used to sink to the seabed; a water inlet filter hole is provided in the screening box, and a sonar fish-repelling device is arranged on the side of the screening box where the water inlet filter hole is provided.

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