A heat dissipation circulation ventilation system for a cabin of a wind turbine generator set

Abstract

The present application provides a heat dissipation circulation ventilation system for a cabin of a wind turbine generator set, which relates to the field of wind power generation and aims to solve the problem that a closed cabin of a wind turbine generator set is easily damaged due to heat accumulation when the wind turbine generator set runs for too long. The key points of its technical solution are that it includes a wind wheel, a generator and an iron tower, the wind wheel is rotatably connected to the generator, a cabin is wrapped around the outer edge of the generator, an installation cavity for fixed placement of the generator is provided inside the cabin, the iron tower is positioned, the end of the iron tower is fixedly connected to the outer wall of the cabin, a plurality of cooling fins are extended on the outer wall of the cabin, the cooling fins are arranged along the length direction of the cabin, and a plurality of cooling holes connected to the installation cavity are provided on the outer wall of the cabin, so as to facilitate the discharge of hot air inside the cabin, effectively alleviate the heat accumulation inside the cabin, increase the contact area between the cabin and the outside air, improve the heat exchange efficiency of the cabin, and effectively reduce the cabin temperature.

Description

Technical Field

[0001] The present application relates to the technical field of wind turbine generator sets, and in particular to a heat dissipation circulation ventilation system for a cabin of a wind turbine generator set. Background Art

[0002] At present, the development of new energy technology is very rapid. Among them, the kinetic energy of wind is converted into mechanical kinetic energy, and then the mechanical energy is converted into electrical kinetic energy. This is wind power generation. The principle of wind power generation is to use wind power to drive the windmill blades to rotate, and then increase the rotation speed through the speed increaser to prompt the generator to generate electricity. According to the current windmill technology, it is about a breeze speed of three meters per second (the degree of breeze) to start generating electricity. Wind power generation as a clean energy is forming a trend in the world, because wind power generation does not require the use of fuel, and does not produce radiation or air pollution. Wind is a new energy with great potential. It has been estimated that the wind resources on the earth that can be used to generate electricity are about 10 billion kilowatts, which is almost 10 times the current global hydropower generation. At present, the energy obtained from burning coal in the world each year is only one-third of the energy provided by wind power in a year. Therefore, both at home and abroad, great importance is attached to the use of wind power to generate electricity and develop new energy.

[0003] The device required for existing wind power generation is called a wind turbine. This wind turbine can be roughly divided into three parts: a wind rotor (including a tail rudder), a generator and an iron tower. (Large-scale wind power stations basically do not have a tail rudder, and generally only small-scale wind power stations (including household-type wind power stations) have a tail rudder.) The wind rotor is an important component that converts the kinetic energy of wind into mechanical energy. It consists of two (or more) propeller-shaped impellers. When the wind blows toward the blades, aerodynamic force is generated on the blades to drive the wind rotor to rotate. The material of the blades requires high strength and light weight. At present, fiberglass or other composite materials (such as carbon fiber) are mostly used to make it. (There are also some vertical wind rotors, S-shaped rotating blades, etc., which have the same function as conventional propeller blades.) Since the speed of the wind rotor is relatively low, and the size and direction of the wind force are often changing, this makes the speed unstable; therefore, before driving the generator, A gear transmission must also be added to increase the speed to the rated speed of the generator, and then a speed regulating mechanism must be added to keep the speed stable, and then it is connected to the generator. A cabin is set around the outer edge of the gear transmission and the generator. The cabin can effectively protect the gear transmission and the generator from external damage. In order to keep the wind rotor always aligned with the wind direction to obtain maximum power, a tail rudder similar to a weather vane must be installed behind the wind rotor. The iron tower is the structure that supports the wind rotor, tail rudder and generator. It is generally built higher in order to obtain larger and more uniform wind force, and it must have sufficient strength. The height of the iron tower depends on the influence of ground obstacles on wind speed and the diameter of the wind rotor. It is generally within the range of 6-20 meters. The function of the generator is to transmit the constant speed obtained by the wind rotor to the generator mechanism for uniform operation through speed increase, thereby converting mechanical energy into electrical energy.

[0004] The above-mentioned existing technical solutions have the following defects: the generator will continuously generate heat at a high speed during wind power generation, and the closed cabin has an unsatisfactory heat dissipation effect. It is easy for heat to accumulate inside the cabin, causing the local temperature to rise rapidly. The continuous increase in temperature will greatly increase the probability of fire damage to the equipment, which is not conducive to the stable operation of the equipment. Summary of the invention

[0005] In view of this, the present application provides a wind turbine cabin heat dissipation circulation ventilation system, which is conducive to conveniently discharging hot air inside the cabin, effectively alleviating the heat accumulation inside the cabin, while increasing the contact area between the cabin and the outside air, improving the heat exchange efficiency of the cabin and effectively reducing the cabin temperature.

[0006] The present application provides a wind turbine generator nacelle heat dissipation circulation ventilation system, comprising:

[0007] A wind wheel, a generator and an iron tower, wherein the wind wheel is rotatably connected to the generator, a cabin is wrapped around the outer edge of the generator, an installation cavity for fixing the generator is provided inside the cabin, the iron tower is positioned, the end of the iron tower is fixedly connected to the outer wall of the cabin, a plurality of cooling fins are extended from the outer wall of the cabin, the cooling fins are arranged along the length direction of the cabin, and a plurality of cooling holes connected to the installation cavity are provided on the outer wall of the cabin.

[0008] By adopting the above technical solution, the heat dissipation holes ensure that the heat dissipation cavity is connected to the outside world to facilitate the discharge of hot air inside the cabin, effectively alleviating the heat accumulation inside the cabin. The fixed connection between the heat dissipation fins and the outer wall of the cabin increases the contact area between the cabin and the outside air, improves the heat exchange efficiency of the cabin and effectively reduces the cabin temperature.

[0009] Furthermore, the heat dissipation fins are arranged to be inclined and raised at one end away from the cabin.

[0010] By adopting the above technical solution, the temperature of the root of the cooling fins close to the cabin is higher, and the cold air at the root of the cooling fins will expand due to the heat, resulting in a decrease in density, and then flow upward along the direction of gravity. The inclined and elevated cooling fin structure can ensure that the hot air rises unimpeded, and the cold air flows in and fills the air, ensuring that the roots of the cooling fins are in continuous contact with the cold air, avoiding local accumulation of hot air, and thus improving the heat dissipation efficiency of the cooling fins.

[0011] Furthermore, water baffles are extended from the outer side walls at both ends of the cabin in the length direction, and the water baffles are arranged in close contact with the heat dissipation fins. The water baffles, the heat dissipation fins and the cabin cooperate to form a water storage tank.

[0012] By adopting the above technical solution, the water storage tank can accumulate liquid water when the water flows through the outer wall of the cabin, so that the outer wall of the cabin and the cooling fins are continuously in contact with the liquid water. The liquid water absorbs a large amount of heat through evaporation, effectively reducing the temperature of the cabin.

[0013] Furthermore, the generator is fitted with an elastic thermally conductive pad wrapped around the outer wall, and the elastic thermally conductive pad is fitted with the inner wall of the cavity.

[0014] By adopting the above technical solution, the elastic thermal pad can effectively fill the gap between the inner wall of the installation cavity and the outer wall of the generator, ensuring that the heat of the generator can be evenly and quickly transferred to the cabin body through the elastic thermal pad, facilitating subsequent improvements to the cabin for heat dissipation.

[0015] Furthermore, a hollow heat exchange cavity is provided inside the heat dissipation fin, and the heat exchange cavity is partially filled with cooling liquid.

[0016] By adopting the above technical solution, the coolant is at the root of the cooling fins under the action of gravity. When the cabin temperature rises, causing the temperature of the cooling fins to rise, the coolant is heated and vaporized, taking away a large amount of heat. The vaporized coolant will rise and contact the end of the cooling fins away from the cabin, and transfer the heat it carries to the surrounding air through heat exchange. It will then liquefy to form droplets and flow to the root of the cooling fins under the action of gravity, and then carry out the next round of heat cycle.

[0017] Furthermore, the coolant is liquid ammonia.

[0018] By adopting the above technical solution, liquid ammonia, as a medium that is easily vaporized by heat, can effectively ensure the rate of heat circulation of the coolant.

[0019] Furthermore, a water diversion groove is provided on the top wall of the cabin along the gravity direction, a sprinkler head for continuously overflowing water flow is fixedly provided on the bottom wall of the water diversion groove, and the notch of the water diversion groove is aligned with the water storage tank.

[0020] By adopting the above technical solution, the sprinkler head can ensure that there is a steady flow of water flowing through the outer wall of the cabin to take away a large amount of accumulated heat, effectively reducing the cabin temperature. At the same time, the water inlet trough can also keep the water level in the water storage tank good, thereby ensuring that the cabin can maintain normal operating temperature even when working for a long time.

[0021] Furthermore, the water storage tank notch is covered with an anti-steam plate, and the anti-steam plate is penetrated by a plurality of through holes.

[0022] By adopting the above technical solution, the anti-steam plate can effectively reduce the loss rate of water vapor after endothermic vaporization and save water.

[0023] Furthermore, the heat dissipation fins are arranged in an up-and-down manner, and the heat dissipation fins gradually increase in length from top to bottom along the direction of gravity. A water overflow hole connected to the water storage tank is provided on a side of the heat dissipation fins away from the outer wall of the cabin.

[0024] By adopting the above technical solution, water can flow gradually and stably to fill all water tanks from top to bottom, and the cooling fins can maintain the maximum heat dissipation rate to ensure the continuous and stable operation of the generator set.

[0025] Further,

[0026] In summary, the beneficial technical effects of this application are:

[0027] 1. The heat dissipation fins are used to increase the heat exchange rate between the cabin and the outside world and reduce the cabin temperature;

[0028] 2. The heat exchange chamber and liquid ammonia are used to increase the heat dissipation rate of the heat sink fins through internal heat circulation;

[0029] 3. Water spray heads and water storage tanks are used to reduce the cabin temperature by absorbing heat through the evaporation of liquid water. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall structure of a heat dissipation circulation ventilation system for a wind turbine generator cabin according to an embodiment of the present application;

[0031] Figure 2 This is a schematic diagram of the overall structure of a heat dissipation circulation ventilation system for a wind turbine generator cabin according to an embodiment of the present application;

[0032] Figure 3 This is a schematic diagram of the overall structure of a wind turbine cabin heat dissipation circulation ventilation system according to an embodiment of the present application;

[0033] Figure 4 for Figure 3 A magnified schematic diagram of the structure of the middle A section;

[0034] Figure 5 This is a rear cross-sectional schematic diagram of the overall structure of a heat dissipation circulation ventilation system for a nacelle of a wind turbine generator set according to an embodiment of the present application;

[0035] Figure 6 for Figure 5 Enlarged schematic diagram of the structure of part B in the middle.

[0036] In the figure: 1. wind wheel; 2. iron tower; 3. generator; 31. elastic thermal pad; 4. cabin; 41. heat dissipation hole; 42. water baffle; 43. water storage tank; 5. heat dissipation fins; 51. overflow hole; 6. sprinkler head; 61. water diversion trough; 7. steam-proof plate. DETAILED DESCRIPTION

[0037] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0038] References to "one embodiment" or "an embodiment" in this specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present application. Therefore, the phrases "in one embodiment" or "in an embodiment" appearing in various places in this specification do not necessarily refer to the same embodiment, but may refer to the same embodiment. In addition, in one or more embodiments, the particular features, structures, or characteristics can be combined in any appropriate manner, as would be apparent to one of ordinary skill in the art from this disclosure.

[0039] The present application is further described in detail below in conjunction with the accompanying drawings.

[0040] Reference Figure 1 and Figure 2 , a heat dissipation circulation ventilation system for a cabin of a wind turbine generator set provided by the present application, comprising a wind wheel 1, a generator 3 and an iron tower 2, the wind wheel 1 is rotatably connected to the generator 3, the outer edge of the generator 3 is wrapped with a cabin 4, the cabin 4 is provided with an installation cavity for fixing the generator 3, the iron tower 2 is positioned, the end of the iron tower 2 is fixedly connected to the outer wall of the cabin 4, and is characterized in that: a plurality of heat dissipation fins 5 are extended from the outer wall of the cabin 4, the heat dissipation fins 5 are arranged along the length direction of the cabin 4, the outer wall of the cabin 4 is provided with a plurality of heat dissipation holes 41 connected to the installation cavity, the temperature of the heat dissipation fins 5 near the root of the cabin 4 is higher, and the cold air will expand due to heat at the root of the heat dissipation fins 5 This causes the density to decrease, and then the air flows upward in the direction of gravity. The inclined and elevated heat dissipation fin 5 structure can ensure that the hot air flows upward without hindrance, and the cold air flows in and fills the structure, ensuring that the roots of the heat dissipation fins 5 are in continuous contact with the cold air, avoiding local accumulation of hot air, thereby improving the heat dissipation efficiency of the heat dissipation fins 5. The generator is fitted with an elastic thermal pad 31 wrapped around the outer wall. The elastic thermal pad 31 is fitted with the inner wall of the installation cavity. The elastic thermal pad 31 can effectively fill the gap between the inner wall of the installation cavity and the outer wall of the generator, ensuring that the heat of the generator can be evenly and quickly transferred to the cabin 4 through the elastic thermal pad 31, which is convenient for subsequent improvements to the cabin 4 to dissipate heat.

[0041] Reference Figure 3 , Figure 4 , Figure 5 and Figure 6The heat dissipation fins 5 are arranged at an angle and rise at one end away from the cabin 4. The temperature of the roots of the heat dissipation fins 5 near the cabin 4 is higher. The cold air will expand due to the heat at the roots of the heat dissipation fins 5, resulting in a decrease in density, and then flow upward along the gravity direction. The heat dissipation fins 5 structure arranged at an angle and rise can ensure that the hot air rises without hindrance, and the cold air flows into the filling accordingly, ensuring that the roots of the heat dissipation fins 5 are in continuous contact with the cold air, thereby avoiding the occurrence of local hot air accumulation, thereby improving the heat dissipation efficiency of the heat dissipation fins 5. The cabin 4 is provided with water baffles 42 extending from the outer side walls at both ends in the length direction. The water baffles 42 are arranged in contact with the heat dissipation fins 5. The water baffles 42, the heat dissipation fins 5 and the cabin 4 cooperate to form a water storage tank 43. The cabin 4 is provided with a water diversion tank 61 on the top wall along the gravity direction. A water diversion tank 61 is fixedly provided with a sprinkler head 6 for continuously overflowing water flow. The notch of the water diversion tank 61 is aligned with the water storage tank 43. The water storage tank 43 can accumulate liquid water when the water flows through the outer wall of the cabin 4. The outer wall of the cabin 4 and the heat dissipation fins 5 are in continuous contact with liquid water. The liquid water absorbs a large amount of heat through evaporation, effectively reducing the temperature of the cabin 4. The sprinkler head 6 can ensure that there is a continuous flow of water flowing through the outer wall of the cabin 4 to take away a large amount of accumulated heat, effectively reducing the temperature of the cabin 4. At the same time, the water diversion groove 61 can also keep the water storage tank 43 at a good water level, thereby ensuring that the cabin 4 can work for a long time and maintain a normal working temperature. The notch of the water storage tank 43 is covered with an anti-steam plate 7, and the anti-steam plate 7 is penetrated by a number of through holes. The anti-steam plate 7 can effectively reduce the loss rate of water vapor after heat absorption and vaporization, saving water. The heat dissipation fins 5 are arranged in an upper and lower stacking manner, and the heat dissipation fins 5 gradually increase in length from top to bottom along the direction of gravity. The side of the heat dissipation fin 5 away from the outer wall of the cabin 4 is provided with an overflow hole 51 connected to the water storage tank 43, so that the water flow can gradually and orderly fill all the water storage tanks 43 from top to bottom. The heat dissipation fins 5 can maintain the maximum heat dissipation rate to ensure the continuous and stable operation of the generator 3 groups.

[0042] Reference Figure 6 A hollow heat exchange cavity is provided inside the heat dissipation fin 5, and the heat exchange cavity is partially filled with coolant, which is liquid ammonia. Under the action of gravity, the coolant is at the root of the heat dissipation fin 5. When the temperature of the cabin 4 rises, causing the temperature of the heat dissipation fin 5 to rise, the coolant is heated and vaporized, taking away a large amount of heat. The vaporized coolant will rise and contact the end of the heat dissipation fin 5 away from the cabin 4, and transfer the carried heat to the surrounding air through heat exchange, and then liquefy to form droplets, which flow to the root of the heat dissipation fin 5 under the action of gravity, and then carry out the next round of heat cycle.

[0043] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

[0044] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may also include more other equivalent embodiments without departing from the concept of the present application, all of which belong to the protection scope of the present application.

Claims

1. A heat dissipation circulation ventilation system for a nacelle of a wind turbine generator set, comprising a wind wheel (1), a generator (3) and an iron tower (2), wherein the wind wheel (1) is rotatably connected to the generator (3), a nacelle (4) is arranged around the outer edge of the generator (3), an installation cavity for fixing the generator (3) is provided inside the nacelle (4), the iron tower (2) is positioned, and the end of the iron tower (2) is fixedly connected to the outer wall of the nacelle (4), characterized in that: A plurality of heat dissipation fins (5) are extendedly provided on the outer wall of the nacelle (4), the heat dissipation fins (5) are arranged along the length direction of the nacelle (4), and a plurality of heat dissipation holes (41) communicating with the installation cavity are opened on the outer wall of the nacelle (4); The heat dissipation fin (5) is arranged to be inclined and raised at one end away from the cabin (4); The nacelle (4) is provided with water baffles (42) extending from the outer side walls at both ends in the length direction, the water baffles (42) are arranged in close contact with the heat dissipation fins (5), and the water baffles (42), the heat dissipation fins (5) and the nacelle (4) cooperate to form a water storage tank (43); A hollow heat exchange cavity is arranged inside the heat dissipation fin (5), and a portion of the heat exchange cavity is filled with a coolant; The cabin (4) is provided with a water diversion groove (61) on the top wall along the gravity direction, a water spray head (6) for continuously overflowing water flow is fixedly arranged on the bottom wall of the water diversion groove (61), and the notch of the water diversion groove (61) is arranged to align with the water storage tank (43); The notch of the water storage tank (43) is covered with an anti-steam plate (7), and the anti-steam plate (7) is penetrated by a plurality of through holes; The heat dissipation fins (5) are arranged in an up-and-down manner, and the heat dissipation fins (5) gradually increase in length from top to bottom along the direction of gravity. A water overflow hole (51) connected to the water storage tank (43) is provided on a side of the heat dissipation fins (5) away from the outer wall of the cabin (4).

2. A heat dissipation circulation ventilation system for a wind turbine generator nacelle according to claim 1, characterized in that: The generator is provided with an elastic heat-conducting pad (31) wrapped in a manner conforming to the outer wall thereof, and the elastic heat-conducting pad (31) is provided in a manner conforming to the inner wall of the installation cavity.

3. A heat dissipation circulation ventilation system for a wind turbine generator nacelle according to claim 1, characterized in that: The coolant is liquid ammonia.

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