Heat dissipation structure and wind generating set

Abstract

The utility model discloses a heat dissipation structure and a wind generating set, the heat dissipation structure comprises an air duct housing, an inner circulation air duct, an outer circulation air duct, an inner circulation fan and an outer circulation fan, the air duct housing is arranged on the outer side of a shell frame structure of the wind generating set; the inner circulating air duct and the outer circulating air duct are arranged in the air duct housing in a heat exchange manner and are not communicated with each other; the internal circulating fan is arranged in the internal circulating air duct and is used for enabling internal air flow of the shell frame structure to circularly flow through the internal circulating air duct; the outer circulating fan is arranged in the outer circulating air duct and used for enabling external airflow of the shell frame structure to circularly flow through the outer circulating air duct. According to the heat dissipation structure, the purpose of heat dissipation of the interior of the shell frame structure can be achieved, meanwhile, due to the fact that the inner circulation air channel and the outer circulation air channel are not communicated, dust and other foreign matter in the external environment can only pass through the outer circulation air channel and cannot enter the inner circulation air channel; therefore, the problem that foreign matters enter the shell frame structure to influence the operation of internal equipment is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of heat dissipation of wind power generation equipment, and more specifically to a heat dissipation structure and a wind power generator set. Background Art

[0002] As a large-scale equipment that converts wind energy into electrical energy, how to circulate and dissipate the heat generated by the internal equipment of the wind turbine frame structure (such as the tower or nacelle) has always been a concern for designers in the industry. Stable internal ventilation and heat dissipation cycle of the frame structure is a strong guarantee for the safe operation of wind turbines.

[0003] Taking the tower in the shell structure as an example, the current internal heat dissipation method for the tower is mainly to allow cooling air to enter the interior of the tower through a tower door with a filtering structure, cool the internal equipment, and then exhaust the hot air through an axial flow fan installed on the tower wall to achieve a cyclic heat dissipation process. However, when encountering a harsh environment, this heat dissipation method and structure may cause dust and other foreign matter in the external environment to enter the tower through the filtering structure, thereby affecting the operation of the internal equipment and being detrimental to the heat dissipation and protection of the internal equipment of the tower; similarly, the internal heat dissipation of the cabin in the shell structure also has similar problems.

[0004] In summary, how to solve the problem that foreign matter in the external environment can easily enter the interior of the frame structure when the heat dissipation structure of the wind turbine performs heat dissipation and affect the operation of the internal equipment has become a technical problem that needs to be solved urgently by technical personnel in this field. Utility Model Content

[0005] In view of this, the utility model provides a heat dissipation structure and a wind turbine generator set to solve the problem that when the heat dissipation structure of the wind turbine generator set performs heat dissipation, foreign matter in the external environment can easily enter the interior of the frame structure and affect the operation of the internal equipment.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A heat dissipation structure, applied to a wind turbine generator set, comprising:

[0008] An air duct cover is arranged on the outer side of the frame structure of the wind turbine generator set;

[0009] The inner circulation air duct and the outer circulation air duct are arranged in the air duct housing in a heat exchange arrangement and are not connected to each other;

[0010] An internal circulation fan, disposed in the internal circulation air duct and used to circulate the internal airflow of the frame structure through the internal circulation air duct;

[0011] The external circulation fan is arranged in the external circulation air duct and is used to circulate the external air flow of the shell frame structure through the external circulation air duct.

[0012] Optionally, the inner circulation air duct and the outer circulation air duct achieve heat exchange through an air heat exchange structure arranged in the air duct cover, and the air heat exchange structure includes a first heat exchange channel and a second heat exchange channel arranged in a heat exchange manner, the first heat exchange channel is configured as a partial duct structure of the inner circulation air duct, and the second heat exchange channel is configured as a partial duct structure of the outer circulation air duct.

[0013] Optionally, the air heat exchange structure includes a plurality of heat sinks arranged in sequence and spaced apart from each other, the first heat exchange flow channel is configured as a flow channel cavity formed inside each of the heat sinks, and the second heat exchange flow channel is configured as a flow channel gap between two adjacent heat sinks.

[0014] Optionally, the flow channel cavity inside the heat sink and / or the flow channel gap between two adjacent heat sinks are constructed as a microchannel structure.

[0015] Optionally, a flow channel direction of the first heat exchange channel and a flow channel direction of the second heat exchange channel are arranged at an angle.

[0016] Optionally, the air duct cover is provided with an air inlet and an air outlet connected to the external environment of the frame structure, the external circulation air duct includes an air guide cavity arranged in the air duct cover, the external circulation fan is installed in the air guide cavity, the air inlet end of the air guide cavity is connected to the air inlet, the air outlet end of the air guide cavity is connected to the air inlet side of the second heat exchange flow channel, and the air outlet side of the second heat exchange flow channel is connected to the air outlet.

[0017] Optionally, a first fan bracket arranged opposite to the air inlet is provided in the air guide cavity, and the external circulation fan is provided on the first fan bracket;

[0018] And / or, the air inlet and / or the air outlet is configured as a filter screen structure.

[0019] Optionally, the internal circulation air duct includes an air extraction chamber and an air outlet chamber provided in the air duct housing, the air inlet end of the air extraction chamber and the air outlet end of the air outlet chamber are both connected to the internal cavity of the housing structure, the air outlet end of the air extraction chamber is connected to the air inlet side of the first heat exchange flow channel, and the air outlet side of the first heat exchange flow channel is connected to the air inlet end of the air outlet chamber;

[0020] Wherein, the internal circulation fan is arranged in the air suction chamber and / or the air outlet chamber.

[0021] Optionally, the air duct cover is provided with a first air duct partition and a second air duct partition arranged in sequence and at intervals along a preset direction, the exhaust chamber is constructed as an air duct chamber formed by a side of the first air duct partition facing away from the second air duct partition and the air duct cover, and the air outlet chamber is constructed as an air duct chamber formed by a side of the second air duct partition facing away from the first air duct partition and the air duct cover; the air heat exchange structure is arranged between the first air duct partition and the second air duct partition, the first air duct partition is provided with an air guide inlet connected to the air inlet side of the first heat exchange flow channel, and the second air duct partition is provided with an air guide outlet connected to the air outlet side of the first heat exchange flow channel.

[0022] Optionally, the frame structure includes at least one of a tower wall, a tower door, a nacelle wall and a nacelle door of the wind turbine generator set.

[0023] Compared with the background technology introduction, the above-mentioned heat dissipation structure is applied to a wind generator set, including an air duct cover, an internal circulation air duct, an external circulation air duct, an internal circulation fan and an external circulation fan, wherein the air duct cover is arranged on the outside of the frame structure of the wind generator set; the internal circulation air duct and the external circulation air duct are arranged in the air duct cover in a heat exchange manner and are not connected to each other; the internal circulation fan is arranged in the internal circulation air duct, and is used to circulate the internal airflow of the frame structure through the internal circulation air duct; the external circulation fan is arranged in the external circulation air duct, and is used to circulate the external airflow of the frame structure through the external circulation air duct. In the actual application process, the heat dissipation structure is installed by installing the air duct shell to the outside of the frame structure of the wind turbine generator set. Since the air duct shell is provided with an inner circulation air duct and an outer circulation air duct arranged in a heat exchange manner and not connected to each other, and the external airflow can circulate through the outer circulation air duct through the outer circulation fan, the internal airflow of the frame structure can circulate through the inner circulation air duct through the inner circulation fan, and then the internal airflow of the frame structure can achieve heat exchange with the external airflow of the outer shell structure, thereby achieving internal heat dissipation of the frame structure. Therefore, the heat dissipation structure can achieve the purpose of heat dissipation inside the frame structure. At the same time, since the inner circulation air duct and the outer circulation air duct are not connected to each other, foreign matter such as dust in the external environment can only pass through the outer circulation air duct, and cannot enter the inner circulation air duct, thereby avoiding the problem of foreign matter entering the interior of the frame structure and affecting the operation of the internal equipment.

[0024] In addition, the utility model also provides a wind turbine generator set, including a frame structure and a heat dissipation structure arranged on the frame structure, wherein the heat dissipation structure is the heat dissipation structure described in any of the above schemes. Since the above heat dissipation structure has the above technical effects, the wind turbine generator set having the heat dissipation structure should also have the corresponding technical effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A front perspective structural diagram of a heat dissipation structure provided by an embodiment of the utility model;

[0027] Figure 2 A schematic diagram of the side structure of the heat dissipation structure provided by an embodiment of the utility model;

[0028] Figure 3 A schematic diagram of the structure of the air heat exchange structure provided by an embodiment of the utility model;

[0029] Figure 4 A schematic diagram of the split structure of the heat dissipation structure provided by an embodiment of the utility model;

[0030] Figure 5 A schematic diagram of the structure of the internal circulation air duct provided in the embodiment of the utility model;

[0031] Figure 6 This is a structural principle diagram of the external circulation air duct provided in an embodiment of the utility model.

[0032] in, Figure 5 and Figure 6 The hollow arrows in the figure represent the direction of air circulation;

[0033] in addition Figure 1-Figure 6 middle:

[0034] Air duct housing 1, air inlet 11, air outlet 12, first air duct baffle 13, second air duct baffle 14;

[0035] Internal circulation air duct 2, air extraction chamber 21, air outlet chamber 22, second fan bracket 23;

[0036] External circulation air duct 3, air guide cavity 31, first fan bracket 32;

[0037] Internal circulation fan 4;

[0038] External circulation fan 5;

[0039] Shell structure 6;

[0040] Air heat exchange structure 7 , heat sink 70 , first heat exchange channel 71 , second heat exchange channel 72 . DETAILED DESCRIPTION

[0041] The core of the utility model is to provide a heat dissipation structure and a wind turbine generator set to solve the problem that when the heat dissipation structure of the wind turbine generator set performs heat dissipation, foreign matter in the external environment can easily enter the interior of the frame structure and affect the operation of the internal equipment.

[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] Reference Figure 1-Figure 6 The utility model provides a heat dissipation structure, which is applied to a wind turbine generator set, and specifically includes an air duct cover 1, an inner circulation air duct 2, an outer circulation air duct 3, an inner circulation fan 4 and an outer circulation fan 5, wherein the air duct cover 1 is arranged on the outside of a frame structure 6 of the wind turbine generator set; the inner circulation air duct 2 and the outer circulation air duct 3 are arranged in the air duct cover 1 in a heat exchange arrangement and in a non-interconnected manner; the inner circulation fan 4 is arranged in the inner circulation air duct 2, and is used to circulate the internal airflow of the frame structure 6 through the inner circulation air duct 2; the outer circulation fan 5 is arranged in the outer circulation air duct 3, and is used to circulate the external airflow of the frame structure 6 through the outer circulation air duct 3.

[0044] It should be noted that those skilled in the art should be able to understand that the frame structure 6 is the main structural component of the wind turbine generator set, which can specifically include a tower and a nacelle arranged on the top of the tower, so the air duct cover 1 can be specifically arranged on the outside of the tower, such as on the tower wall or the tower door, or on the outside of the nacelle, such as on the nacelle wall or the nacelle door. In actual application, the arrangement can be selected according to the heat dissipation requirements of the internal equipment of the tower and the heat dissipation requirements of the internal equipment of the nacelle, and no more specific restrictions are made here. In addition, the specific way in which the air duct cover 1 is arranged on the frame structure 6 can be, but is not limited to, a way of fixing with fasteners. In addition, in order to enable the internal circulation air duct 2 to circulate with the internal air flow of the frame structure 6, the frame structure 6 should form corresponding connecting openings at the air inlet end and the air outlet end corresponding to the internal circulation air duct 2; similarly, in order to enable the external circulation air duct 3 to circulate with the external air flow of the frame structure 6, the air duct shell cover 1 should be provided with an air inlet 11 connected to the air inlet end of the external circulation air duct 3 and an air outlet 12 connected to the air outlet end of the external circulation air duct 3.

[0045] In the actual application process, the heat dissipation structure is installed by installing the air duct cover 1 to the outside of the frame structure 6 of the wind turbine generator set. Since the air duct cover 1 is provided with an inner circulation air duct 2 and an outer circulation air duct 3 which are arranged in a heat exchange manner and are not connected to each other, and the external airflow can circulate through the outer circulation air duct 3 through the outer circulation fan 5, the internal airflow of the frame structure 6 can circulate through the inner circulation air duct 2 through the inner circulation fan 4, and then the internal airflow of the frame structure 6 can achieve heat exchange with the external airflow of the outer shell structure 6, thereby achieving internal heat dissipation of the frame structure 6. Therefore, the heat dissipation structure can achieve the purpose of heat dissipation inside the frame structure 6. At the same time, since the inner circulation air duct 2 and the outer circulation air duct 3 are not connected to each other, then foreign matter such as dust in the external environment can only pass through the outer circulation air duct 3, and cannot enter the inner circulation air duct 2, thereby avoiding the problem of foreign matter entering the interior of the frame structure 6 and affecting the operation of the internal equipment.

[0046] In some specific implementation schemes, the inner circulation air duct 2 and the outer circulation air duct 3 can achieve the purpose of heat exchange through an air heat exchange structure 7 arranged in the air duct shell 1. The air heat exchange structure 7 can specifically include a first heat exchange channel 71 and a second heat exchange channel 72 arranged in a heat exchange manner. The first heat exchange channel 71 is configured as a partial air duct structure of the inner circulation air duct 2, and the second heat exchange channel 72 is configured as a partial air duct structure of the outer circulation air duct 3. By designing the air heat exchange structure 7, the heat exchange between the inner circulation air duct 2 and the outer circulation air duct 3 is more direct, the heat exchange efficiency is high and the structure is relatively simple. Of course, it can be understood that the use of the air heat exchange structure to achieve heat exchange between the inner circulation air duct 2 and the outer circulation air duct 3 is only an example of the embodiment of the utility model. In actual application, it can also be designed into other heat exchange structure forms, such as the two can also exchange heat through a phase change heat exchanger. It should also be noted that the air heat exchange structure 7 can be specifically designed to be an integrated structure with the air duct cover 1, or can be designed to be a split fixedly connected structure. In actual application, the layout can be selected according to actual needs.

[0047] In a further embodiment, referring to Figure 3 , combined with Figure 5 and Figure 6The air heat exchange structure 7 may specifically include a plurality of heat sinks 70 arranged in sequence at intervals, wherein the plurality of heat sinks 70 are preferably, but not limited to, arranged in parallel and at equal intervals, the first heat exchange channel 71 may specifically be configured as a channel cavity formed inside each heat sink 70, and the second heat exchange channel 72 may specifically be configured as a channel gap between two adjacent heat sinks 70, so that the airflow flowing through the inner circulation air duct 2 can exchange heat with the airflow flowing through the second heat exchange channel 72 in the outer circulation air duct 3 through the heat sink 70 when flowing through the first heat exchange channel 71, and the more the number of heat sinks 70, the larger the heat exchange area, which helps to improve the heat exchange efficiency. Of course, it can be understood that the air heat exchange structure is only a preferred example of the embodiment of the utility model. In actual application, it can also be designed into other air heat exchange structures. For example, the air heat exchange structure 7 can be designed into a structure of two channel cavities separated by heat exchange plates, which can also achieve heat exchange and reduce the ventilation resistance of the inner circulation fan 4 and the outer circulation fan 5.

[0048] In a further embodiment, the flow channel cavity inside the heat sink 70 can also be configured as a microchannel structure; similarly, the flow channel gap between two adjacent heat sinks 70 can also be configured as a microchannel structure. The microchannel structure can improve the uniformity and efficiency of heat exchange.

[0049] It should be noted that the flow direction of the first heat exchange flow channel 71 and the flow direction of the second heat exchange flow channel 72 are generally designed to be arranged at an angle, for example, referring to Figure 3 As shown, the flow direction of the first heat exchange flow channel 71 is arranged perpendicularly to the flow direction of the second heat exchange flow channel 72. Of course, it can also be designed to have other angle values. In actual application, the corresponding angle arrangement can be selected according to actual needs. By designing the structural form of the above-mentioned angle arrangement, the arrangement of the inner circulation air duct 2 and the outer circulation air duct 3 is more convenient.

[0050] In some other specific embodiments, referring to Figure 4 Combination Figure 6The air duct housing 1 is provided with an air inlet 11 and an air outlet 12 which are connected to the external environment of the frame structure 6. The air inlet 11 and / or the air outlet 12 can be specifically configured as a filter screen structure. By designing the filter screen structure, foreign matter can be prevented from entering the external circulation air duct 3. The external circulation air duct 3 can specifically include an air guide cavity 31 arranged in the air duct housing 1. The external circulation fan 5 is installed in the air guide cavity 31. The air inlet end of the air guide cavity 31 is connected to the air inlet 11, and the air outlet end of the air guide cavity 31 is connected to the air inlet side of the second heat exchange flow channel 72. The air outlet side of the second heat exchange flow channel 72 is connected to the air outlet 12. The specific working process is: under the action of the external circulation fan 5, the external airflow enters the air guide cavity 31 through the air inlet 11, and then guides the airflow to the air outlet 12 through the second heat exchange flow channel 72 to complete the external circulation of the airflow. By designing the above-mentioned air guide cavity 31, the external airflow first enters the air guide cavity 31 and then is distributed to the second heat exchange channel 72. Especially when there are multiple second heat exchange channels 72, it can ensure that the airflow distribution is more uniform and abundant, which helps to improve the uniformity and stability of heat exchange.

[0051] In a further embodiment, the number of the air heat exchange structure 7 can be one or two, see Figure 6 In the present invention, it is preferred to design two air heat exchange structures 7, and the two air heat exchange structures 7 are respectively arranged on both sides of the air guide cavity 31, such as the left and right sides of the air guide cavity 31. By designing this structural form, one air guide cavity 31 can simultaneously supply external airflow to the second heat exchange flow channels 72 of the two air heat exchange structures 7, which helps to improve the heat exchange efficiency and reduce the number of external circulation fans 5.

[0052] In some specific implementation schemes, a first fan bracket 32 ​​arranged opposite to the air inlet 11 can be provided in the air guide cavity 31, and the external circulation fan 5 is arranged on the first fan bracket 32, wherein one external circulation fan 5 can be installed on the above-mentioned first fan bracket 32, and multiple external circulation fans 5 can also be installed. By designing the first fan bracket 32, the installation of the external circulation fan 5 is more convenient, and the first fan bracket 32 ​​can specifically be an integrated structure with the air guide cavity 31, or a split fixed connection structure.

[0053] In some other specific embodiments, referring to Figure 5The above-mentioned internal circulation air duct 2 may specifically include an exhaust chamber 21 and an outlet chamber 22 arranged in the air duct housing 1, wherein the air inlet end of the exhaust chamber 21 and the air outlet end of the outlet chamber 22 are both connected to the internal cavity of the frame structure 6, the air outlet end of the exhaust chamber 21 is connected to the air inlet side of the first heat exchange channel 71, and the air outlet side of the first heat exchange channel 71 is connected to the air inlet end of the outlet chamber 22. By designing the above-mentioned exhaust chamber 21 and outlet chamber 22, the connection between the interior of the frame structure 6 and the internal circulation air duct 2 is more convenient to arrange, and the first heat exchange channel 71 is constructed as a part of the air duct cavity of the internal circulation air duct 2, which is simpler. In addition, the internal circulation fan 4 can be specifically selected to be arranged in the exhaust chamber 21, or in the outlet chamber 22, or the internal circulation fan 4 is arranged in both the exhaust chamber 21 and the outlet chamber 22, that is, the exhaust chamber 21 and the outlet chamber 22 are more convenient for the installation and arrangement of the internal circulation fan 4. In addition, in order to facilitate the installation and arrangement of the internal circulation fan 4 , the internal circulation fan 4 can be installed to the air suction chamber 21 and / or the air outlet chamber 22 through a second fan bracket 23 .

[0054] It should be noted that Figure 5 The manner in which the middle air intake chamber 21 is located above the air outlet chamber 22 is merely an example of an embodiment of the present utility model. In actual application, the air intake chamber 21 may also be designed to be located below the air outlet chamber 22 .

[0055] In a further embodiment, referring to Figure 5 As shown, the air duct housing 1 may be specifically provided with a first air duct partition 13 and a second air duct partition 14 arranged in sequence along a preset direction (for example, from top to bottom), the exhaust chamber 21 is configured as an air duct chamber formed by the side of the first air duct partition 13 facing away from the second air duct partition 14 and the air duct housing 1, and the outlet chamber 22 is configured as an air duct chamber formed by the side of the second air duct partition 14 facing away from the first air duct partition 13 and the air duct housing 1; the air heat exchange structure 7 is arranged between the first air duct partition 13 and the second air duct partition 14, the first air duct partition 13 is provided with an air guide inlet connected to the air inlet side of the first heat exchange flow channel 71, and the second air duct partition 14 is provided with an air guide outlet connected to the air outlet side of the first heat exchange flow channel 71. By designing the above-mentioned structural form, it is simpler and more convenient to make the exhaust chamber 21 and the outlet chamber 22 in the air duct housing 1.

[0056] In addition, the utility model also provides a wind turbine generator set, including a frame structure and a heat dissipation structure arranged on the frame structure, wherein the heat dissipation structure is the heat dissipation structure described in any of the above schemes. Since the above heat dissipation structure has the above technical effects, the wind turbine generator set having the heat dissipation structure should also have the corresponding technical effects, which will not be described in detail here.

[0057] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0058] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0059] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0061] Specific examples are used herein to illustrate the principles and implementation methods of the present invention, and the description of the above embodiments is only used to help understand the core idea of ​​the present invention. Although the present application has been described with reference to the preferred embodiments, various improvements may be made thereto and components thereof may be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments may be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A heat dissipation structure, applied to a wind turbine generator set, characterized in that: include: An air duct cover (1) is arranged on the outside of the frame structure (6) of the wind generator set; The inner circulation air duct (2) and the outer circulation air duct (3) are arranged in a heat exchange manner and are not connected to each other in the air duct housing (1); An internal circulation fan (4) is arranged in the internal circulation air duct (2) and is used to circulate the internal air flow of the shell frame structure (6) through the internal circulation air duct (2); An external circulation fan (5) is arranged in the external circulation air duct (3) and is used to circulate the external air flow of the frame structure (6) through the external circulation air duct (3).

2. The heat dissipation structure according to claim 1, characterized in that: The inner circulation air duct (2) and the outer circulation air duct (3) achieve heat exchange through an air heat exchange structure (7) arranged in the air duct housing (1), wherein the air heat exchange structure (7) comprises a first heat exchange flow channel (71) and a second heat exchange flow channel (72) arranged in a heat exchange manner, wherein the first heat exchange flow channel (71) is configured as a partial air duct structure of the inner circulation air duct (2), and the second heat exchange flow channel (72) is configured as a partial air duct structure of the outer circulation air duct (3).

3. The heat dissipation structure according to claim 2, characterized in that: The air heat exchange structure (7) comprises a plurality of heat sinks (70) arranged in sequence and spaced apart from each other, the first heat exchange flow channel (71) being configured as a flow channel cavity formed inside each of the heat sinks (70), and the second heat exchange flow channel (72) being configured as a flow channel gap between two adjacent heat sinks (70).

4. The heat dissipation structure according to claim 3, characterized in that: The flow channel cavity inside the heat sink (70) and / or the flow channel gap between two adjacent heat sinks (70) are configured as a microchannel structure.

5. The heat dissipation structure according to claim 3, characterized in that: The flow direction of the first heat exchange flow channel (71) and the flow direction of the second heat exchange flow channel (72) are arranged at an angle.

6. The heat dissipation structure according to claim 2, characterized in that: The air duct housing (1) is provided with an air inlet (11) and an air outlet (12) which are in communication with the external environment of the frame structure (6); the external circulation air duct (3) comprises an air guide cavity (31) arranged in the air duct housing (1); the external circulation fan (5) is installed in the air guide cavity (31); the air inlet end of the air guide cavity (31) is in communication with the air inlet (11); the air outlet end of the air guide cavity (31) is in communication with the air inlet side of the second heat exchange flow channel (72); and the air outlet side of the second heat exchange flow channel (72) is in communication with the air outlet (12).

7. The heat dissipation structure according to claim 6, characterized in that: A first fan bracket (32) arranged opposite to the air inlet (11) is arranged in the air guide cavity (31), and the external circulation fan (5) is arranged on the first fan bracket (32); And / or, the air inlet (11) and / or the air outlet (12) are configured as a filter screen structure.

8. The heat dissipation structure according to any one of claims 2 to 7, characterized in that: The internal circulation air duct (2) comprises an air suction chamber (21) and an air outlet chamber (22) arranged in the air duct housing (1); the air inlet end of the air suction chamber (21) and the air outlet end of the air outlet chamber (22) are both connected to the internal cavity of the housing frame structure (6); the air outlet end of the air suction chamber (21) is connected to the air inlet side of the first heat exchange flow channel (71); and the air outlet side of the first heat exchange flow channel (71) is connected to the air inlet end of the air outlet chamber (22); Wherein, the internal circulation fan (4) is arranged in the air suction chamber (21) and / or in the air outlet chamber (22).

9. The heat dissipation structure according to claim 8, characterized in that: The air duct shell (1) is provided with a first air duct partition plate (13) and a second air duct partition plate (14) which are arranged in sequence and spaced apart along a preset direction; the exhaust chamber (21) is constructed as an air duct chamber formed by a side of the first air duct partition plate (13) facing away from the second air duct partition plate (14) and the air duct shell (1); the outlet chamber (22) is constructed as an air duct chamber formed by a side of the second air duct partition plate (14) facing away from the first air duct partition plate (13) and the air duct shell (1); the air heat exchange structure (7) is arranged between the first air duct partition plate (13) and the second air duct partition plate (14); the first air duct partition plate (13) is provided with an air guide inlet connected to the air inlet side of the first heat exchange flow channel (71); the second air duct partition plate (14) is provided with an air guide outlet connected to the air outlet side of the first heat exchange flow channel (71).

10. The heat dissipation structure according to claim 1, characterized in that: The frame structure (6) comprises at least one of a tower wall, a tower door, a nacelle wall and a nacelle door of the wind turbine generator set.

11. A wind turbine generator set, comprising a frame structure and a heat dissipation structure arranged on the frame structure, characterized in that: The heat dissipation structure is the heat dissipation structure as claimed in any one of claims 1 to 10.

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