An air-cooled wind turbine generator set

Abstract

The invention belongs to the technical field of wind power generation, specifically an air-cooled wind power generator set, including blades, a hub, a gear box, a generator, a nacelle and a tower, wherein the blades are mounted on the hub, the hub is rotatably mounted at one end of the nacelle, the gear box and the generator are located in the inner cavity of the nacelle, the output shaft of the gear box is connected to the rotor shaft of the generator through a coupling, the input shaft of the gear box is connected to the hub, the nacelle is transversely mounted on the top of the tower, and the interior of the tower is further provided with a first heat exchanger, a second heat exchanger, a third heat exchanger, a unit heat exchanger and a circulation pipeline, which can well realize the heat dissipation of the unit and further reduce the temperature level; a unit regional temperature control method that makes full use of natural resources, thereby realizing systematic temperature control and lower energy consumption of the unit; and regulating the heat in the tower from top to bottom, so that the heat regulation inside the tower is uniform.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, in particular to an air-cooled wind power generator set. Background Art

[0002] Wind turbines are devices that convert wind energy in nature into electrical energy, and the corresponding electrical energy is green and clean energy. With the increasing capacity of wind turbines, the heat loss of each subsystem and component of the unit itself is increasing. According to incomplete statistics, the heat loss of the unit itself accounts for about 8% to 10% of the unit capacity. For example, for a unit with a capacity of 10MW, the heat loss of the unit itself is as high as nearly 1MW, which shows that the heat loss value is considerable. A direct problem caused by the huge heat loss is the heat dissipation problem, that is, how to efficiently and quickly dissipate the heat of the unit itself. Summary of the invention

[0003] The object of the present invention is to provide an air-cooled wind turbine generator set to solve the problem of how to efficiently and quickly dissipate the heat generated by the wind turbine set itself, as mentioned in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: an air-cooled wind turbine generator set, comprising blades, a hub, a gearbox, a generator, a nacelle and a tower, wherein the blades are mounted on the hub, the hub is rotatably mounted at one end of the nacelle, the gearbox and the generator are located in the inner cavity of the nacelle, the output shaft of the gearbox is connected to the rotor shaft of the generator through a coupling, the input shaft of the gearbox is connected to the hub, and the nacelle is transversely mounted on the top of the tower;

[0005] A wind energy conversion component is arranged inside the tower, and a first heat exchanger, a second heat exchanger, a third heat exchanger, a unit heat exchanger and a circulation pipeline are also arranged inside the tower. The first heat exchanger, the second heat exchanger, the third heat exchanger and the unit heat exchanger are installed from top to bottom inside the tower, and the circulation pipeline is in the shape of a connected circulation pipe in the cabin and the tower. The first heat exchanger, the second heat exchanger, the third heat exchanger and the unit heat exchanger are respectively connected to the two sides of the circulation pipeline. The bottom end of the unit heat exchanger is connected to a coil, and the inlet and outlet of the coil are respectively connected to the two sides of the circulation pipeline. The coil extends into the soil layer, and the bottom end of the tower is supported on the soil layer. The circulation pipeline is also provided with an expansion valve, a compressor, a first booster pump and a second booster pump.

[0006] As an improvement of the above technical solution, the liquid inside the first heat exchanger, the second heat exchanger, the third heat exchanger, and the unit heat exchanger is deionized water, pure water, pure water + ethylene glycol, propylene glycol, refrigerant or cooling liquid medium.

[0007] As an improvement of the above technical solution, the first heat exchanger, the second heat exchanger and the third heat exchanger are used in parallel, in series or in a combination of series and parallel.

[0008] As an improvement of the above technical solution, the second boost pump and the first boost pump are respectively located between the first heat exchanger and the second heat exchanger and between the second heat exchanger and the third heat exchanger.

[0009] As an improvement of the above technical solution, the expansion valve, the first booster pump and the second booster pump are all bidirectionally regulated.

[0010] As an improvement of the above technical solution, the coil is spiral-shaped, and heat exchange fins are evenly arranged on the outer wall of the coil, and the heat exchange fins are distributed in the soil layer.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1) It can effectively dissipate heat of the unit and further reduce the temperature level;

[0013] 2) A unit area temperature control method that makes full use of natural resources to achieve systematic temperature control and lower unit energy consumption;

[0014] 3) Regulate the heat inside the tower from top to bottom so that the heat inside the tower is evenly regulated. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the structure of the air-cooling components inside the tower of the present invention;

[0017] Figure 3 This is a control principle diagram of the cooling mode of the present invention;

[0018] Figure 4 This is a control principle diagram of the heating mode of the present invention.

[0019] In the figure: 1 blade, 2 hub, 3 gear box, 4 generator, 5 nacelle, 6 tower, 7 first heat exchanger, 8 second heat exchanger, 9 third heat exchanger, 10 unit heat exchanger, 11 expansion valve, 12 coil, 13 soil layer, 14 compressor, 15 first booster pump, 16 second booster pump, 17 circulation pipeline. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0021] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] Example:

[0023] See also Figure 1-3 The present invention provides a technical solution: an air-cooled wind turbine generator set, comprising a blade 1, a hub 2, a gear box 3, a generator 4, a nacelle 5 and a tower 6, wherein the blade 1 is mounted on the hub 2, the hub 2 is rotatably mounted at one end of the nacelle 5, the gear box 3 and the generator 4 are located in the inner cavity of the nacelle 5, the output shaft of the gear box 3 is connected to the rotor shaft of the generator 4 through a coupling, the input shaft of the gear box 3 is connected to the hub 2, and the nacelle 5 is horizontally mounted at the top of the tower 6;

[0024] The wind turbine generator set is mainly composed of blades 1, hub 2, generator 4, nacelle 5, tower 6, gearbox 3, converter and other components. Blades 1 absorb incoming wind energy and convert it into the rotational mechanical energy of the impeller system, thereby driving the coaxial gearbox 3 to increase the speed. Generator 4 converts the mechanical energy into electrical energy, which is then connected to the grid after being rectified and inverted by the converter, thereby realizing the transmission of electrical energy.

[0025] A wind energy conversion component is arranged inside the tower 6. A first heat exchanger 7, a second heat exchanger 8, a third heat exchanger 9, a unit heat exchanger 10 and a circulation pipeline 17 are also arranged inside the tower 6. The first heat exchanger 7, the second heat exchanger 8, the third heat exchanger 9 and the unit heat exchanger 10 are installed from top to bottom inside the tower 6. The circulation pipeline 17 is in a connected circulation pipe shape in the cabin 5 and the tower 6. The first heat exchanger 7, the second heat exchanger 8, the third heat exchanger 9 and the unit heat exchanger 10 are respectively connected to the two sides of the circulation pipeline 17. The bottom end of the unit heat exchanger 10 is connected to the coil 12, and the inlet and outlet of the coil 12 are respectively connected to the two sides of the circulation pipeline 17. The coil 12 extends into the soil layer 13. The bottom end of the tower 6 is supported on the soil layer 13. The circulation pipeline 17 is also provided with an expansion valve 11, a compressor 14, a first booster pump 15 and a second booster pump 16.

[0026] Furthermore, the liquid inside the first heat exchanger 7, the second heat exchanger 8, the third heat exchanger 9, and the unit heat exchanger 10 is deionized water, pure water, pure water+ethylene glycol, propylene glycol, refrigerant or cooling liquid medium.

[0027] Furthermore, the first heat exchanger 7, the second heat exchanger 8, and the third heat exchanger 9 are used in parallel, series, or a mixture of series and parallel. In order to ensure the temperature level of different areas of the unit, the air-cooling method arranges the first heat exchanger 7, the second heat exchanger 8, the third heat exchanger 9, etc. in a targeted manner. Taking into account the different heat loads in different areas, the first heat exchanger 7, the second heat exchanger 8, and the third heat exchanger 9 can perform better heat exchange.

[0028] Furthermore, the second boost pump 16 and the first boost pump 15 are respectively located between the first heat exchanger 7 and the second heat exchanger 8 and between the second heat exchanger 8 and the third heat exchanger 9. Taking into account the height factors of the first heat exchanger 7, the second heat exchanger 8, the third heat exchanger 9 and the like in different spatial regions, the second boost pump 16 and the first boost pump 15 are added between different cycles to ensure the consistency of the liquid supply temperature of the first heat exchanger 7, the second heat exchanger 8, and the third heat exchanger 9 in each spatial region.

[0029] Furthermore, the expansion valve 11, the first boost pump 15 and the second boost pump 16 are all bidirectionally regulated. The air-cooled wind turbine generator set and the temperature control device can realize the cooling mode and the heating mode under the premise of ensuring that the hardware configuration remains unchanged. At this time, it is only necessary to change the flow direction of the expansion valve 11; in principle, the cooling mode and the heating mode both follow the second law of thermodynamics, and under the premise of consuming a certain amount of electrical energy, heat is absorbed from the low-temperature environment and released into the high-temperature environment.

[0030] Furthermore, the coil 12 is spiral-shaped, and heat exchange fins are evenly arranged on the outer wall of the coil 12. The heat exchange fins are distributed in the soil layer 13, and can have a better contact effect with the soil layer 13 to achieve good heat exchange.

[0031] One side of the heat exchange cycle of the air-cooled wind turbine generator set is the soil layer 13 of the earth. The soil layer 13 is a large heat sink, and no matter in summer or winter, the temperature of the soil layer 13 is at least 1-2°C lower or higher than the external ambient temperature. Therefore, the temperature control device and system can obtain better heat exchange effect and higher thermal efficiency than traditional air-cooled heat exchange devices.

[0032] Heat exchangers are arranged at various spatial positions inside the unit, such as the first heat exchanger 7, the second heat exchanger 8, the third heat exchanger 9 and the heat generating part of the unit. The heat exchanger is in the form of a liquid-air heat exchanger, and the temperature of different spatial parts of the unit is controlled through the air side. The heated air exchanges heat with the liquid side inside the first heat exchanger 7, the second heat exchanger 8, and the third heat exchanger 9, and the temperature of the liquid side rises. At this time, after the heat exchange cycle composed of the compressor 14, the expansion valve 11, and the unit heat exchanger 10, the heat passes through the unit heat exchanger 10, transfers the heat to the coil 12, and transfers it to the soil layer 13 through the liquid inside the coil 12. The soil is a huge heat sink that can accommodate a considerable amount of heat and has a very slow temperature rise effect, thereby ensuring the temperature of the liquid inside the coil 12, and then ensuring the temperature of the liquid in the unit heat exchanger 10, thereby achieving the temperature control of the unit, and achieving cooling and heat dissipation.

[0033] The air-cooled wind turbine generator set realizes the closed air-cooling cycle mode of the wind turbine generator set. Under the premise of ensuring the sealing of the unit, the air-cooled temperature control system (cooling / heating) does not need to consider external factors such as dust, relative humidity, etc.;

[0034] Since the air-cooled wind turbine generator set realizes a closed air-cooling cycle mode of the wind turbine generator set, all hardware related to the air-cooling system is inside the unit, thus avoiding the external placement of the cooling fan unit in the traditional air-cooling method, thereby avoiding the noise pollution caused by the unit's cooling system to the surrounding environment.

[0035] Cooling: By configuring liquid-air heat exchangers at different positions, low-temperature air can be obtained at the end of the corresponding heat exchanger in cooling mode. The low-temperature air cools the heat source components such as the pitch cabinet, generator and other components, while the liquid on the other side of the heat exchanger is heated. The high-temperature liquid is compressed by the compressor and heat exchanged with the low-temperature soil through the liquid-liquid heat exchanger.

[0036] Heating: Since the unit is located in a low-temperature environment such as winter or extremely cold areas, and a certain temperature such as 25°C is beneficial to the service life and reliability of components and original devices, different components have different requirements for heating modes. At this time, the earth's soil side is a high-temperature environment, and heat is absorbed from the soil through a liquid-liquid heat exchanger. Then, the high-temperature liquid can be transferred to different spatial areas of the unit at a low temperature through a compressor and an expansion valve through a liquid-air heat exchanger; thereby, the temperature in different spatial areas is increased to a certain extent, achieving the overall uniformity of the spatial temperature in different areas of the unit;

[0037] Considering that different heat exchange components have different heating requirements and different spatial locations of different heat exchange components, in order to take into account the consistency of the end temperature of different heat exchangers, different combinations are used for heat exchange, such as Figure 4 The middle is one of the combinations, and the principle followed is: when the distances between different components are close and the heat exchange rate is small, the heat exchanger can be connected in series; when the distances between different components are far and the heat exchange rate of a single component is large, the heat exchanger can be connected in parallel.

[0038] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An air-cooled wind turbine generator set, comprising blades (1), a hub (2), a gearbox (3), a generator (4), a nacelle (5) and a tower (6), characterized in that: The blade (1) is mounted on a wheel hub (2), the wheel hub (2) is rotatably mounted on one end of a nacelle (5), the gear box (3) and the generator (4) are located in an inner cavity of the nacelle (5), the output shaft of the gear box (3) is connected to the rotor shaft of the generator (4) via a coupling, the input shaft of the gear box (3) is connected to the wheel hub (2), and the nacelle (5) is transversely mounted on the top of a tower (6); A wind energy conversion assembly is arranged inside the tower (6), and a first heat exchanger (7), a second heat exchanger (8), a third heat exchanger (9), a unit heat exchanger (10) and a circulation pipeline (17) are also arranged inside the tower (6). The first heat exchanger (7), the second heat exchanger (8), the third heat exchanger (9) and the unit heat exchanger (10) are installed from top to bottom inside the tower (6), and the circulation pipeline (17) is in the form of a circulating pipe that is connected inside the cabin (5) and the tower (6). The two sides of the three heat exchangers (9) and the unit heat exchanger (10) are respectively connected to the two side pipes of the circulation pipeline (17); the bottom end of the unit heat exchanger (10) is connected to a coil (12); the inlet and outlet of the coil (12) are respectively connected to the two sides of the circulation pipeline (17); the coil (12) extends into the soil layer (13); the bottom end of the tower (6) is supported on the soil layer (13); the circulation pipeline (17) is also provided with an expansion valve (11), a compressor (14), a first booster pump (15) and a second booster pump (16); The second boost pump (16) and the first boost pump (15) are respectively located between the first heat exchanger (7) and the second heat exchanger (8) and between the second heat exchanger (8) and the third heat exchanger (9); The expansion valve (11), the first booster pump (15) and the second booster pump (16) are all bidirectionally regulated; The coil (12) is spiral-shaped, and heat exchange fins are evenly arranged on the outer wall of the coil (12), and the heat exchange fins are distributed in the soil layer (13).

2. The air-cooled wind turbine generator set according to claim 1, characterized in that: The liquid inside the first heat exchanger (7), the second heat exchanger (8), the third heat exchanger (9), and the unit heat exchanger (10) is a cooling liquid medium.

3. The air-cooled wind turbine generator set according to claim 1, characterized in that: The first heat exchanger (7), the second heat exchanger (8), and the third heat exchanger (9) are used in parallel, in series, or in a combination of series and parallel.

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