Wind turbine tower cooling system

Abstract

The present invention discloses a heat dissipation system for a wind turbine tower, comprising: a tower bottom platform, a tower door structure, a first axial flow fan, a second axial flow fan and a heat dissipation duct assembly. The tower bottom platform divides the tower section where it is located into a space above the platform and a space below the platform, and the tower bottom platform is provided with a duct through hole; the tower door structure comprises a door plate and a fixed plate, the door plate is provided with an air inlet connected to the space above the platform, and the fixed plate is provided with an air outlet connected to the space below the platform; the upstream axial flow fan is located in the space above the platform; the downstream axial flow fan is located in the space below the platform; the heat dissipation duct assembly comprises an outer duct located outside the tower and an inner duct located inside the tower and passing through the tower bottom platform via the duct through hole, one end of the inner duct is connected to the exhaust port of the upstream axial flow fan, and the other end is connected to the air intake port of the downstream axial flow fan. The heat dissipation system of the present invention accelerates the heat dissipation speed in the tower by arranging a plurality of axial flow fans in series.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a heat dissipation system of a wind turbine tower. Background Art

[0002] With the rise of high-power wind turbines, tower heights are getting higher and higher, and concrete towers have come into being. However, the heat dissipation performance of concrete cylinders is much lower than that of steel tower cylinders, and the bottom of the tower is placed with heat-generating electrical equipment such as converters, auxiliary transformers, tower base control cabinets, and even box-type transformers. If the heat generated by these heat-generating electrical equipment cannot be discharged from the tower in time, the heat will accumulate more and more in the relatively closed tower, thereby affecting the normal operation of these electrical equipment and even the entire unit. Therefore, it is very necessary to design a tower heat dissipation system that can dissipate heat quickly and efficiently. Summary of the invention

[0003] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0004] In order to at least partially solve the above problem, according to a first aspect of the present invention, a heat dissipation system for a wind turbine tower is provided, wherein electrical equipment is installed at the bottom of the tower, and the heat dissipation system comprises:

[0005] A tower bottom platform, wherein the tower bottom platform is sealed and connected to the tower wall, thereby dividing the tower section where the tower bottom platform is located into a space above the platform and a space below the platform, wherein the electrical equipment is installed on the tower bottom platform and is located in the space above the platform, and wherein the tower bottom platform is provided with a pipeline through hole near the installation position of the electrical equipment;

[0006] A tower door structure, the tower door structure comprising a door panel and a fixed plate located below the door panel, the door panel being provided with an air inlet communicating with the space above the platform, and the fixed plate being provided with an air outlet communicating with the space below the platform;

[0007] an upstream axial flow fan, the upstream axial flow fan being installed in the space above the platform and close to the exhaust port of the electrical equipment;

[0008] A downstream axial flow fan, the downstream axial flow fan is mounted on the fixed plate and is located in the space below the platform, so that the downstream axial flow fan is coaxial with the air outlet of the fixed plate;

[0009] A heat dissipation duct assembly, the heat dissipation duct assembly comprising an outer duct located outside the tower and connected to the air outlet of the fixed plate at one end, and an inner duct located inside the tower and passing through the bottom platform of the tower via the duct through-hole, one end of the inner duct being connected to the exhaust port of the upstream axial flow fan, and the other end being connected to the air intake port of the downstream axial flow fan.

[0010] Furthermore, the space above the platform is installed with multiple electrical equipment and multiple upstream axial flow fans corresponding to each electrical equipment, and the inner duct includes multiple branch pipes extending from the exhaust port of each upstream axial flow fan, passing through the duct through hole and merging in the space below the platform.

[0011] Furthermore, the plurality of electrical devices include a first electrical device and a second electrical device respectively located on the left and right sides of the tower door structure.

[0012] Furthermore, the width of the first electrical equipment is greater than the radius of the tower, the width direction of the first electrical equipment is perpendicular to the door panel in a closed state, the first upstream axial flow fan corresponding to the first electrical equipment is arranged on the back side of the first electrical equipment, the central axis of the first upstream axial flow fan is parallel to the width direction of the first electrical equipment and the exhaust port of the first upstream axial flow fan faces one side of the tower door structure, and the front panel of the first electrical equipment is provided with an air intake grille.

[0013] Furthermore, an air intake grille is provided on a side panel of the converter facing the tower door structure.

[0014] Furthermore, the width of the second electrical equipment is less than half the width of the first electrical equipment, the front panel of the second electrical equipment faces the side of the tower door structure and is provided with an air intake grille, the second upstream axial flow fan corresponding to the second electrical equipment is arranged on the back side of the second electrical equipment, the central axis of the second upstream axial flow fan is parallel to the width direction of the second electrical equipment and the air intake port of the second upstream axial flow fan is facing the side away from the first electrical equipment.

[0015] Furthermore, a portion of the inner pipe located below the tower bottom platform is spaced a certain distance from the tower bottom platform.

[0016] Furthermore, the outer duct includes a first section extending from the air outlet in a horizontal direction and a second section extending obliquely downward from an end of the first section away from the tower wall.

[0017] Furthermore, an inclination angle of the second section relative to the first section is 45° to 55°.

[0018] Furthermore, the tower door structure also includes a door frame, the outer wall of the door frame is fixedly connected to the tower wall, and the tower door and the fixing plate are connected to the inner wall of the door frame, so that the tower door and the fixing plate are both located in the door frame.

[0019] The heat dissipation system of the wind turbine tower of the present invention realizes the serial arrangement of multiple axial flow fans by respectively arranging axial flow fans at both ends of the internal pipeline of the tower, thereby accelerating the speed at which the hot air generated by the heat-generating electrical equipment is discharged from the tower, and then the cold air outside the tower flows into the tower faster due to the increase of negative pressure in the tower, thereby improving the cooling effect of the electrical equipment in the tower. By arranging a tower bottom platform with pipeline through holes and sealedly connected to the tower wall, and making the tower air inlet and outlet communicate with the space above the platform and the space below the platform respectively, most of the heat dissipation pipelines in the tower are located in the space below the platform, thereby effectively reducing the temperature of the space above the platform where the electrical equipment is located. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following drawings of the present invention are used as part of the present invention for understanding the present invention. The drawings show the embodiments of the present invention and their descriptions, and are used to explain the device and principle of the present invention. In the drawings,

[0021] Figure 1 It is a structural schematic diagram of a heat dissipation system of a wind turbine tower according to an embodiment of the present invention;

[0022] Figure 2 A schematic top view of a heat dissipation system of a wind turbine tower according to an embodiment of the present invention;

[0023] Figure 3 It is a front schematic diagram of a heat dissipation system of a wind turbine tower according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0025] In order to fully understand the present invention, a detailed structure will be presented in the following description to illustrate the present invention. Obviously, the implementation of the present invention is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other embodiments and should not be construed as being limited to the embodiments presented here.

[0026] It should be understood that the purpose of the terms used herein is only to describe specific embodiments and is not intended to limit the present invention. The singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. When the terms "comprise" and / or "include" are used in this specification, they indicate the presence of the features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof. The terms "upper", "lower", "front", "back", "left", "right" and similar expressions used in the present invention are for illustrative purposes only and are not limiting.

[0027] Ordinal numbers such as "first" and "second" cited in the present invention are merely identifications and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of the "second component", and the term "second component" itself does not imply the existence of the "first component".

[0028] Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the accompanying drawings. These drawings show representative embodiments of the present invention and do not limit the present invention.

[0029] The present invention provides a heat dissipation system for a wind turbine tower, wherein the wind turbine tower is a concrete tower with a plurality of heat-generating electrical devices installed at the bottom. Figure 1-3As shown, the first electrical equipment 1 and the second electrical equipment 2 are installed at the bottom of the tower, the first electrical equipment 1 can be a converter, and the second electrical equipment 2 can be a transformer or a tower base control cabinet. The heat dissipation system includes a tower bottom platform 3, a tower door structure 4, a first upstream axial flow fan 5, a second upstream axial flow fan 6, a downstream axial flow fan 7 and a heat dissipation pipeline assembly. Among them, the tower bottom platform 3 is sealed and connected to the tower wall, so that the tower section where it is located is divided into a space above the platform and a space below the platform. The first electrical equipment 1 and the second electrical equipment 2 are installed on the tower bottom platform 3 and are located in the space above the platform. The tower bottom platform 3 is respectively provided with pipeline through holes near the installation positions of the first electrical equipment 1 and the second electrical equipment 2. The tower door structure 4 includes a door panel 41 and a fixing plate 42 located below the door panel 41. The door panel 41 is provided with an air inlet connected to the space above the platform. The air inlet may include two shutters 411 and 412 located above and below the handle and the door lock, respectively. Preferably, filter cotton is respectively provided on the inner sides of the shutters 411 and 412. The fixed plate 42 is provided with an air outlet 421 connected to the space below the platform. The first upstream axial flow fan 5 and the second upstream axial flow fan 6 are respectively installed in the space above the platform at positions close to the respective air outlets of the first electrical equipment 1 and the second electrical equipment 2. The downstream axial flow fan 7 is installed on the fixed plate 42 and is located in the space below the platform, so that the downstream axial flow fan 7 is coaxial with the air outlet 421 of the fixed plate 42. Specifically, the fixed plate 42 is provided with a circle of connection holes around the air outlet 421, and the downstream axial flow fan 7 is connected to the fixed plate 42 through the air outlet flange, so that the hot air discharged from the air outlet of the downstream axial flow fan 7 is discharged to the outside of the tower through the air outlet 421 of the fixed plate 42. The heat dissipation duct assembly includes an outer duct 8 located outside the tower and connected at one end to the air outlet 421 of the fixing plate 42, and an inner duct 9 located inside the tower and passing through the platform 3 at the bottom of the tower via the above-mentioned duct through hole. The air inlet end of the inner duct 9 is respectively connected to the air outlet 52 of the first upstream axial flow fan 5 and the air outlet 62 of the second upstream axial flow fan 6, and the air outlet end is connected to the air intake of the downstream axial flow fan 7. The inner duct 9 includes a first branch pipe 91 and a second branch pipe 92 extending from the air outlet 52 of the first upstream axial flow fan 5 and the air outlet 62 of the second upstream axial flow fan 6, respectively, through the respective duct through holes and converging in the space below the platform. Preferably, the outer duct 8 and the inner duct 9 are both made of steel pipes.

[0030] The heat dissipation system of the wind turbine tower of the present invention realizes the serial arrangement of multiple axial flow fans by respectively arranging axial flow fans at both ends of the internal pipeline of the tower, thereby accelerating the speed of the hot air generated by the heat-generating electrical equipment to be discharged from the tower, and then the cold air outside the tower flows into the tower faster due to the increase of negative pressure in the tower, thereby improving the cooling effect of the electrical equipment in the tower. The hot air discharged by the electrical equipment is directly sucked into the pipeline through the upstream axial flow fan to form an independent hot air discharge path; and by arranging a tower bottom platform with pipeline through holes and sealed with the tower wall, and making the tower air inlet and outlet communicate with the space above the platform and the space below the platform respectively, most of the heat dissipation pipelines in the tower are located in the space below the platform, thereby effectively reducing the temperature of the space above the platform where the electrical equipment is located. Furthermore, by dividing the tower door panel structure into a switch part and a fixed part and arranging the air inlet and the air outlet in the two parts respectively, a complete air circulation path is realized without opening the air inlet or the air outlet on the tower wall, thereby simplifying the manufacturing process and reducing the production cost.

[0031] According to an embodiment of the present invention, Figure 2As shown, the first electrical device 1 and the second electrical device 2 are respectively located on the left and right sides of the tower door structure 4, so that an air inlet channel is formed in the area between the first electrical device 1 and the second electrical device 2, and the cold air entering the tower from the air inlet of the door panel 41 can smoothly flow to the first electrical device 1 and the second electrical device 2, thereby fully cooling them. According to an embodiment of the present invention, the cabinet of the first electrical device 1 is constructed into a cubic structure with wider front and back panels and narrower side panels, which is conducive to heat dissipation; and the first electrical device 1 is arranged in the tower so that the width direction is perpendicular to the door panel 41 in a closed state. The front panel of the shell of the first electrical device 1 is provided with an air intake grille, and the back panel of the shell is provided with an air outlet, where an exhaust fan can be built-in. Accordingly, the first upstream axial flow fan 5 is located on the back side of the first electrical device 1, the central axis of the first upstream axial flow fan 5 is parallel to the width direction of the first electrical device 1, and the air intake 51 of the first upstream axial flow fan 5 faces the side opposite to the side of the tower door structure 4, so as to avoid the unheated cold air entering the tower through the air intake of the door panel 41 directly sucking into the heat dissipation duct; the front panel of the first electrical device 1 provided with the air intake grille is close to the cold air flow area entering the tower through the door panel 41, and the width direction of the front panel is consistent with the main flow direction of the cold air, so as to ensure that sufficient cold air enters the first electrical device 1 through the air intake grille of the front panel. Preferably, the width of the first electrical device 1 is greater than the radius of the tower. Further preferably, the side panel of the first electrical device 1 facing the tower door structure 4 is also provided with an air intake grille, so that more cold air enters the first electrical device 1. As the hot air is discharged from the tower, negative pressure is formed in the tower, and cold air enters the tower through the shutters of the door panel 41, thereby achieving the purpose of cooling the heat-generating electrical equipment.

[0032] According to the embodiment of the present invention, the width of the second electrical device 2 is less than half of the width of the first electrical device 1, the front panel of the housing of the second electrical device 2 faces the side of the tower door structure 4 and is provided with an air intake grille, the exhaust port of the second electrical device 2 is provided on the side of the back panel of the housing away from the first electrical device 1, and accordingly, the second upstream axial flow fan 6 is provided on the back side of the second electrical device 2 and the air intake port 61 of the second upstream axial flow fan 6 faces the side away from the first electrical device 1. Arranging the second electrical device 2 with a relatively small width so that the front panel provided with the air intake grille faces the air intake port of the door panel 41 is conducive to inhaling sufficient cold air to improve the heat dissipation effect.

[0033] According to an embodiment of the present invention, Figure 1 and Figure 2As shown, the vast majority of the inner pipe 9 is located in the space below the platform, thereby minimizing the temperature impact of the heat dissipation pipe assembly on the space above the platform. Preferably, the first branch pipe 91 and the second branch pipe 92 are each located in the space above the platform and do not exceed 1 / 4 of their respective portions located in the space below the platform. Furthermore, the portion of the inner pipe 9 located below the tower bottom platform 3 is spaced a certain distance from the tower bottom platform 3, so as to further reduce the impact of the heat dissipation of the inner pipe 9 on the temperature of the space above the platform.

[0034] According to an embodiment of the present invention, Figure 1 As shown, the outer pipe 8 includes a first section 81 extending horizontally from the air outlet 421 of the fixing plate 42 and a second section 82 extending obliquely downward from one end of the first section 81 away from the tower wall. The first section 81 extends a certain distance in the horizontal direction and the second section extends a certain distance in the oblique downward direction, so that the discharge port 83 of the outer pipe 8 is spaced a sufficient distance from the air inlet on the door panel 41 in both the horizontal and vertical directions to prevent the hot air discharged from the outer pipe 8 from being sucked into the space above the platform in the tower through the air inlet on the door panel. In addition, the second section 82 extending obliquely downward can also prevent water in the external environment from entering the interior of the tower. Preferably, the inclination angle of the second section 82 relative to the first section 81 is 45° to 55°.

[0035] According to an embodiment of the present invention, Figure 1 and Figure 3 As shown, the tower door structure 4 also includes a door frame 43, the outer side wall of the door frame 43 is fixedly connected to the tower wall. The fixing plate 42 is fixedly connected to the inner side wall of the door frame 43, for example, it can be fixedly connected to the inner side wall of the door frame 43 by welding. In addition, the door frame 43 is provided with a stopper protruding inward in the area of ​​the door panel 41, which is used to abut against the door panel 41 that reaches the closed position, and the door panel 41 is pivotally connected to the door frame 43. Preferably, the second section 82 of the outer pipe 8 extends to the lowermost end of the door frame 33 in the direction of the tower axis, so that the discharge port 83 of the outer pipe 8 is spaced a sufficient distance from the shutter 412 on the door panel 41.

[0036] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. Terms such as "parts" and "pieces" appearing in this article may represent either a single part or a combination of multiple parts. Terms such as "installation" and "setting" appearing in this article may represent either a component being directly attached to another component or a component being attached to another component through an intermediate. Features described in this article in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0037] The present invention has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above-mentioned embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A heat dissipation system for a wind turbine tower, wherein electrical equipment is installed at the bottom of the tower, characterized in that: The heat dissipation system comprises: A tower bottom platform, wherein the tower bottom platform is sealed and connected to the tower wall, thereby dividing the tower section where the tower bottom platform is located into a space above the platform and a space below the platform, wherein the electrical equipment is installed on the tower bottom platform and is located in the space above the platform, and wherein the tower bottom platform is provided with a pipeline through hole near the installation position of the electrical equipment; A tower door structure, the tower door structure comprising a door panel and a fixed plate located below the door panel, the door panel being provided with an air inlet communicating with the space above the platform, and the fixed plate being provided with an air outlet communicating with the space below the platform; an upstream axial flow fan, the upstream axial flow fan being installed in the space above the platform and close to the exhaust port of the electrical equipment; A downstream axial flow fan, the downstream axial flow fan is mounted on the fixed plate and is located in the space below the platform, so that the downstream axial flow fan is coaxial with the air outlet of the fixed plate; A heat dissipation duct assembly, the heat dissipation duct assembly comprising an outer duct located outside the tower and having one end connected to the air outlet of the fixed plate, and an inner duct located inside the tower and passing through the bottom platform of the tower via the duct through-hole, one end of the inner duct being connected to the exhaust port of the upstream axial flow fan, and the other end being connected to the suction port of the downstream axial flow fan, so that the upstream axial flow fan and the downstream axial flow fan are arranged in series, and most of the inner duct is located in the space below the platform and is spaced a certain distance from the bottom platform of the tower.

2. The heat dissipation system according to claim 1, characterized in that: The space above the platform is installed with multiple electrical devices and multiple upstream axial flow fans corresponding to each electrical device. The inner duct includes multiple branch pipes extending from the exhaust port of each upstream axial flow fan, passing through the duct through-hole and merging in the space below the platform.

3. The heat dissipation system according to claim 2, characterized in that: The plurality of electrical devices include a first electrical device and a second electrical device respectively located at the left and right sides of the tower door structure.

4. The heat dissipation system according to claim 3, characterized in that: The width of the first electrical equipment is greater than the radius of the tower, and the width direction of the first electrical equipment is perpendicular to the door panel in a closed state. The first upstream axial flow fan corresponding to the first electrical equipment is arranged on the back side of the first electrical equipment, and the central axis of the first upstream axial flow fan is parallel to the width direction of the first electrical equipment and the exhaust port of the first upstream axial flow fan faces one side of the tower door structure, and the front panel of the first electrical equipment is provided with an air intake grille.

5. The heat dissipation system according to claim 4, characterized in that: The side panel of the first electrical equipment facing the tower door structure is provided with an air intake grille.

6. The heat dissipation system according to claim 3, characterized in that: The width of the second electrical equipment is less than half of the width of the first electrical equipment, the front panel of the second electrical equipment faces the side of the tower door structure and is provided with an air intake grille, the second upstream axial flow fan corresponding to the second electrical equipment is arranged on the back side of the second electrical equipment, the central axis of the second upstream axial flow fan is parallel to the width direction of the second electrical equipment and the air intake port of the second upstream axial flow fan is facing the side away from the first electrical equipment.

7. The heat dissipation system according to claim 1, characterized in that: The outer duct includes a first section extending from the air outlet in a horizontal direction and a second section extending obliquely downward from an end of the first section away from the tower wall.

8. The heat dissipation system according to claim 7, characterized in that: The inclination angle of the second section relative to the first section is 45° to 55°.

9. The heat dissipation system according to any one of claims 1 to 8, characterized in that: The tower door structure also includes a door frame, the outer side wall of the door frame is fixedly connected to the tower wall, and the tower door and the fixing plate are connected to the inner side wall of the door frame, so that the tower door and the fixing plate are both located in the door frame.

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