Heat dissipation structure and power conversion equipment

Abstract

The utility model discloses a heat dissipation structure and a power conversion device, the heat dissipation structure comprises a heat dissipation cavity and an air outlet conversion member, the heat dissipation cavity is provided with an air inlet and at least two air outlets, and the air outlets are provided with first preset interfaces; the air outlet conversion component is arranged on the first preset connector and used for converting the air outlet mode of the air outlet. Wherein the air outlet modes comprise the first air outlet mode and the second air outlet mode, and the first air outlet mode is configured to be communicated with the air outlet; in the second air outlet mode, the air outlet is closed. According to the heat dissipation structure, opening and closing of the corresponding air outlets can be selected according to the required installation environment, when the distance between the air outlet and a barrier opposite to a certain air outlet is too close, the air outlet can be closed through the air outlet conversion component, and then the problems that air outlet is not smooth and air return is caused at the air inlet due to the too close distance are solved; the installation distance does not need to be increased on the premise that the heat dissipation installation requirement is met, and then the installation cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of air cooling and heat dissipation, and more specifically to a heat dissipation structure and power conversion equipment. Background Art

[0002] For air-cooled power converters, they are generally divided into a sealed electronic cavity and a heat dissipation cavity. The position and wind direction of the air inlet and outlet of the heat dissipation cavity are fixed. For power converters with air outlets on the side, top, back, and bottom, there are relatively strict distance requirements for obstacles on both sides, back, and bottom. If the distance is too close, it will cause poor air outlet and cause air return at the air inlet. If the distance is too far, it will increase the installation cost and site restrictions. Especially for power converters with side air outlets, the spacing requirements for power converters when installed side by side are higher, which will increase the installation cost.

[0003] Therefore, how to solve the problem that the heat dissipation structure of the power converter has high installation cost in order to meet the heat dissipation installation requirements has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0004] In view of this, the utility model provides a heat dissipation structure and a power conversion device to solve the problem that the heat dissipation structure of the power converter has high installation cost in order to meet the heat dissipation installation requirements.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A heat dissipation structure, applied to a power conversion device, comprising:

[0007] A heat dissipation cavity, on which an air inlet and at least two air outlets are provided, and the air outlets are provided with a first preset interface;

[0008] An air outlet changing component, which is arranged at the first preset interface and is used to change the air outlet mode of the air outlet;

[0009] Among them, the air outlet mode includes a first air outlet mode and a second air outlet mode, the first air outlet mode is configured so that the air outlet is open; the second air outlet mode is configured so that the air outlet is closed.

[0010] Optionally, the air outlet changing component includes a first blocking baffle detachably connected to the first preset interface;

[0011] In the second air outlet mode, the first blocking baffle is installed on the first preset interface to block the air outlet.

[0012] Optionally, the air outlet changing component further includes a first air guide plate detachably connected to the first preset interface;

[0013] In the first air outlet mode, the first air guide plate is installed on the first preset interface to form a ventilation structure of the air outlet.

[0014] Optionally, the air outlet direction of the first air guide plate is adjustable.

[0015] Optionally, the air outlet direction of the first air guide plate can be adjusted in a range of 0°-180°.

[0016] Optionally, the air outlet changing component is configured as an air outlet grille, and in the first air outlet mode, the air outlet grille is in an on state, and in the second air outlet mode, the air outlet grille is in a closed state.

[0017] Optionally, the air outlet direction of the air outlet grille is adjustable and the adjustable range is configured to be 0°-180°.

[0018] Optionally, the number of the air inlet is one and is arranged on the back side of the heat dissipation cavity; the number of the air outlets is three and are respectively arranged on the bottom and both sides of the heat dissipation cavity.

[0019] Optionally, the number of the air inlets is multiple, the air inlet is provided with a second preset interface, and the heat dissipation structure further includes an air inlet conversion component provided at the second preset interface and used to convert the air inlet mode of the air inlet;

[0020] Wherein, the air intake mode includes a first air intake mode and a second air intake mode, the first air intake mode is configured so that the air inlet is open; the second air intake mode is configured so that the air inlet is closed.

[0021] Optionally, the air inlet conversion component includes a second blocking baffle detachably connected to the second preset interface;

[0022] In the second air outlet mode, the second blocking baffle is installed on the second preset interface to block the air inlet.

[0023] Optionally, the air inlet conversion component further includes a second air guide plate detachably connected to the second preset interface;

[0024] In the first air outlet mode, the second air guide plate is installed on the second preset interface to form a ventilation structure of the air inlet.

[0025] Optionally, the air inlet direction of the second air guide plate is adjustable.

[0026] Optionally, the air inlet direction of the second air guide plate can be adjusted within a range of 0°-180°.

[0027] Optionally, the air intake conversion component is configured as an air intake grille, and in the first air intake mode, the air intake grille is in an on state, and in the second air intake mode, the air intake grille is in a closed state.

[0028] Optionally, the air outlet direction of the air inlet grille is adjustable, and the adjustable range is configured to be 0°-180°.

[0029] Compared with the background technology, the heat dissipation structure is applied to power conversion equipment, including a heat dissipation cavity and an air outlet conversion component, the heat dissipation cavity is provided with an air inlet and at least two air outlets, and the air outlet is provided with a first preset interface; the air outlet conversion component is arranged at the first preset interface and is used to change the air outlet mode of the air outlet; wherein the air outlet mode includes a first air outlet mode and a second air outlet mode, the first air outlet mode is configured as the air outlet is connected; the second air outlet mode is configured as the air outlet is closed. In the actual application process of the heat dissipation structure, by arranging the air outlet conversion component at the first preset interface of the air outlet, the conduction and closure of the corresponding air outlet can be selected according to the required installation environment, that is, the corresponding air duct path can be selected according to the installation environment. For example, when the obstacle relative to a certain air outlet is too close, the air outlet conversion component can be selected to close the air outlet, thereby avoiding the problem of poor air outlet and return air at the air inlet due to the close distance, and meeting the heat dissipation installation requirements without increasing the installation distance, thereby helping to reduce the installation cost.

[0030] In addition, the utility model provides a power conversion device, including a sealed electronic cavity and a heat dissipation structure arranged outside the electronic cavity and used to dissipate heat from the electronic cavity, wherein the heat dissipation structure is the heat dissipation structure described in any of the above schemes. Since the heat dissipation structure has the above technical effects, the power conversion device 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

[0031] 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.

[0032] Figure 1 A schematic diagram of a front view of a heat dissipation structure provided in an embodiment of the utility model, in which the heat dissipation structure is arranged on the back side of an electronic cavity;

[0033] Figure 2 A schematic diagram of a left-side structure of a heat dissipation structure provided in an embodiment of the utility model and arranged on the back side of an electronic cavity;

[0034] Figure 3 A schematic diagram of a right side structure in which a heat dissipation structure provided by an embodiment of the utility model is arranged on the back side of an electronic cavity;

[0035] Figure 4 A schematic diagram of a top view of a heat dissipation structure provided in an embodiment of the utility model and arranged on the back side of an electronic cavity;

[0036] Figure 5 A schematic diagram of a bottom-up structure in which a heat dissipation structure provided by an embodiment of the utility model is arranged on the back side of an electronic cavity;

[0037] Figure 6 A schematic diagram of a structure in which a first blocking baffle is prepared to be installed at the air outlet on the left side of the heat dissipation cavity of the heat dissipation structure provided by an embodiment of the utility model;

[0038] Figure 7 A schematic diagram of a structure in which a first blocking baffle is installed at the air outlet on the left side of the heat dissipation cavity of the heat dissipation structure provided by an embodiment of the utility model;

[0039] Figure 8 A schematic diagram of a structure in which a first blocking baffle is prepared to be installed at the air outlet at the bottom of the heat dissipation cavity of the heat dissipation structure provided by an embodiment of the utility model;

[0040] Fig. 9 A schematic diagram of a structure in which a first blocking baffle is installed at the air outlet at the bottom of the heat dissipation cavity of the heat dissipation structure provided by an embodiment of the utility model;

[0041] Fig.10 A schematic diagram of the structure of the air outlet at the top of the heat dissipation cavity of the heat dissipation structure provided by an embodiment of the utility model;

[0042] Fig.11 A schematic diagram of a structure in which a first blocking baffle is installed at the air outlet on the top of the heat dissipation cavity of the heat dissipation structure provided by an embodiment of the utility model;

[0043] Fig.12 A schematic structural diagram of a first air guide plate installed at the air outlet on the top of the heat dissipation cavity of the heat dissipation structure provided by an embodiment of the utility model;

[0044] Fig.13 A schematic diagram of the shaft side structure of a power conversion device provided by an embodiment of the utility model;

[0045] Fig.14 A schematic structural diagram of an air outlet grille provided in an air outlet changing member of a heat dissipation cavity provided in an embodiment of the utility model.

[0046] in, Figure 1-Figure 14 middle:

[0047] Heat dissipation cavity 1, air inlet 11, air outlet 12;

[0048] The air outlet changing component 2, the first blocking baffle 21, and the first air guide plate 22;

[0049] Electronic cavity 3. DETAILED DESCRIPTION

[0050] The core of the utility model is to provide a heat dissipation structure and a power conversion device to solve the problem that the heat dissipation structure of the power converter has high installation cost in order to meet the heat dissipation installation requirements.

[0051] 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.

[0052] Reference Figure 1-Figure 14 As shown, those skilled in the art should be able to understand that the power conversion device generally includes an electronic cavity 3 with a closed cavity and a heat dissipation structure arranged on the outside of the electronic cavity 3, wherein the electronic cavity 3 is provided with electrical components related to power conversion, and the heat dissipation structure and the electronic cavity 3 are arranged in a heat exchange manner, and are mainly used to dissipate heat from the electronic cavity 3. Since the heat dissipation structure has a high installation cost to meet the heat dissipation installation requirements, based on this, the utility model specifically provides a heat dissipation structure, which is applied to the power conversion device, including a heat dissipation cavity 1 and an air outlet conversion component 2, wherein the heat dissipation cavity 1 is provided with an air inlet 11 and at least two air outlets 12, and the air outlet 12 is provided with a first preset interface; the air outlet conversion component 2 is provided at the first preset interface and is used to change the air outlet mode of the air outlet 12; and the air outlet mode includes a first air outlet mode and a second air outlet mode, the first air outlet mode is configured to connect the air outlet 12; the second air outlet mode is configured to close the air outlet 12.

[0053] In actual application, the heat dissipation structure can select the opening and closing of the corresponding air outlet 12 according to the required installation environment by arranging the air outlet conversion component 2 at the first preset interface of the air outlet 12, that is, it can select the corresponding air duct path according to the installation environment. For example, when the obstacle relative to a certain air outlet 12 is too close, the air outlet can be closed by the air outlet conversion component 2, thereby avoiding the problem of poor air outlet and return air at the air inlet due to the close distance. Under the premise of meeting the heat dissipation installation requirements, there is no need to increase the installation distance, which helps to reduce the installation cost.

[0054] It should be noted that the number of the air outlets 12 can be two or more than two, and the arrangement positions can be selected and configured according to actual needs. Figure 1-Figure 5 As shown, the number of air inlet 11 is one and is arranged on the back side of the heat dissipation cavity 1, wherein the back side of the heat dissipation cavity 1 refers to the side away from the electronic cavity 3, for example, when the electronic cavity 3 is hung on a wall or a vertical mounting surface, the back side of the heat dissipation cavity 1 refers to the side away from the wall or the vertical mounting surface; the number of air outlets 12 can be specifically designed to be three and are respectively arranged at the bottom and both sides of the heat dissipation cavity 1, that is, one air outlet 12 is designed at the bottom of the heat dissipation cavity 1, one air outlet 12 is designed at the left side of the heat dissipation cavity 1, and one air outlet 12 is designed at the right side of the heat dissipation cavity 1. In the actual working process, at least one of the multiple air outlets 12 should be kept in a conductive state.

[0055] In some specific embodiments, reference Figure 6-Figure 9 As shown, the above-mentioned air outlet changing component 2 may specifically include a first blocking baffle 21 detachably connected to the first preset interface; in the second air outlet mode, the first blocking baffle 21 is installed at the first preset interface to block the air outlet 12. By designing the air outlet changing component 2 into the above-mentioned structural form, when the air outlet 12 needs to be closed, it is only necessary to install the first blocking baffle 21 corresponding to the air outlet 12 at the position of the first preset interface corresponding to the air outlet 12, which is not only simple in structure, but also very convenient to operate and low in cost.

[0056] In a further embodiment, referring to Figure 10-12 The above-mentioned air outlet conversion component 2 may also include a first air guide plate 22 detachably connected to the first preset interface; in the first air outlet mode, the first air guide plate 22 is installed at the first preset interface to form a ventilation structure of the air outlet 12. By designing the first air guide plate 22, the first preset interface can be selected according to the requirements, that is, when the corresponding air outlet 12 has a closing requirement, the corresponding first blocking baffle 21 can be selected to be installed at the position of the first preset interface, so that the air outlet 12 can be blocked, avoiding the adverse effects of the air outlet 12; when the corresponding air outlet 12 has a conduction requirement, the corresponding first air guide plate 22 can be selected to be installed at the position of the first preset interface, so that the conduction of the air outlet 12 can be ensured, and the normal use of the air duct formed by the air outlet 12 can be ensured. The advantage of designing into this structural form is that the air outlet 12 of the heat dissipation cavity 1 only needs to be opened as a whole, which is more convenient to process, and the first air guide plate 22 is detachable, which is more convenient to clean.

[0057] It should be noted that the above-mentioned structural form of independently arranged first air guide plate 22 is only an example of an embodiment of the utility model. In actual application, the first air guide plate 22 can also be designed to be an integrated structure with the air outlet 12. In this case, the air outlet 12 can be switched between on and off by only disassembling the first blocking baffle 21.

[0058] In a further implementation scheme, the air outlet direction of the first air guide plate 22 can be designed to be an adjustable structural form. By designing it into such a structural form, the air outlet direction can also be adjusted according to demand. The use requirements of the air outlet duct can be better guaranteed. Specifically, the adjustable range of the air outlet direction of the first air guide plate 22 can be 0°-180°. When the air outlet direction of the first air guide plate 22 is adjusted to 0° or 180°, the conduction area of ​​the first air guide plate 22 is zero, that is, at this time, the air outlet 12 corresponding to the first air guide plate 22 is in a closed state.

[0059] It should be noted that, refer to Fig.13 and Fig.14 The above-mentioned air outlet conversion component 2 can also be directly configured as an air outlet grille. In the first air outlet mode, the air outlet grille is in the on state, and in the second air outlet mode, the air outlet grille is in the closed state. By designing this structural form, when switching between the two states of closed and on, there is no need to disassemble and assemble additional components, and only the air outlet grille needs to be driven to different working positions. The specific structural form of the air outlet grille can be designed as a structure of a blind, and the opening and closing action of the blind is realized by a linkage. This structure is a relatively mature structural form, so it will not be described in more detail here.

[0060] In a further embodiment, the air outlet direction of the air outlet grille is adjustable and the adjustable range is configured to be 0°-180°. That is, when the air outlet direction of the air outlet grille is at 0° or 180°, the air outlet conductance of the air outlet grille is zero, that is, the corresponding air outlet 12 is in a closed state, and when the air outlet direction is other than the two end points, the air outlet grille is in conduction, and the corresponding air outlet direction can be selected according to demand.

[0061] In some other specific implementation schemes, the number of the air inlets 11 can also be designed to be multiple, and the air inlet 11 can be provided with a second preset interface. Similarly, the heat dissipation structure 1 also includes an air inlet conversion component provided at the second preset interface and used to change the air inlet mode of the air inlet 11; wherein the air inlet mode includes a first air inlet mode and a second air inlet mode, the first air inlet mode is configured to open the air inlet 11; the second air inlet mode is configured to close the air inlet 11. By designing the number of the air inlets 11 to be multiple, it is also possible to select to close some of the air inlets 11 and open some of the air inlets 11 according to the needs, thereby forming a new air duct structure, which can better meet the installation and heat dissipation needs.

[0062] In a further embodiment, the air inlet conversion component may specifically include a second blocking baffle detachably connected to the second preset interface; in the second air outlet mode, the second blocking baffle is installed at the second preset interface to block the air inlet 11. By designing the air inlet conversion component into the above-mentioned structural form, when the air inlet 11 needs to be closed, it is only necessary to install the second blocking baffle corresponding to the air inlet 11 at the position of the second preset interface corresponding to the air inlet 11, which is not only simple in structure, but also very convenient to operate and low in cost.

[0063] In a further embodiment, the air inlet conversion component may also include a second air guide plate detachably connected to the second preset interface; in the first air outlet mode, the second air guide plate is installed at the second preset interface to form a ventilation structure of the air inlet 11. By designing the second air guide plate, the second preset interface can be selected according to the requirements, that is, when the corresponding air inlet 11 has a closure requirement, the corresponding second blocking baffle can be installed at the position of the second preset interface, so that the air inlet 11 can be blocked to avoid the adverse effects of the air intake of the air inlet 11; when the corresponding air inlet 11 has a conduction requirement, the corresponding second air guide plate can be installed at the position of the second preset interface, so that the conduction of the air inlet 11 can be ensured, and the normal use of the air duct formed by the air inlet 11 can be ensured. The advantage of designing into this structural form is that the air inlet 11 of the heat dissipation cavity 1 only needs to be opened as a whole, which is more convenient to process, and the second air guide plate is detachable, which is more convenient to clean.

[0064] It should be noted that the above-mentioned structural form of independently arranged second air guide plate is only an example of an embodiment of the utility model. In actual application, the second air guide plate can also be designed to be an integrated structure with the air inlet 11. In this case, the air inlet 11 can be switched between on and off only by disassembling the second blocking baffle.

[0065] In a further implementation scheme, the air inlet direction of the second air guide plate can be designed to be an adjustable structural form. By designing it into this structural form, the air inlet direction can also be adjusted according to demand. The use requirements of the air inlet duct can be better guaranteed. Specifically, the adjustable range of the air inlet direction of the merchant's second air guide plate can be 0°-180°. Among them, when the air inlet direction of the second air guide plate can be adjusted to 0° or 180°, the conduction area of ​​the second air guide plate is zero, that is, the air inlet 11 corresponding to the second air guide plate is in a closed state at this time.

[0066] It should be noted that the above-mentioned air intake conversion component can be specifically configured as an air intake grille. In the first air intake mode, the air intake grille is in a conductive state, and in the second air intake mode, the air intake grille is in a closed state. By designing it into this structural form, when switching between the two states of closed and conductive, there is no need to disassemble and assemble additional components, and it is only necessary to drive the air intake grille to different working positions. The specific structural form of the air intake grille can be designed as a structure of a blind, and the opening and closing action of the blind is realized by a linkage. This structure is a relatively mature structural form, so it is not described in more detail here.

[0067] In a further embodiment, the air outlet direction of the air inlet grille is adjustable, and the adjustable range is configured to be 0°-180°. That is, when the air inlet direction of the air inlet grille is at 0° or 180°, the air inlet conductance of the air inlet grille is zero, that is, the corresponding air inlet 11 is in a closed state at this time, and when the air inlet direction is other than the two end points, the air inlet grille is in conduction, and the corresponding air inlet direction can be selected according to demand.

[0068] In addition, those skilled in the art should be able to understand that in order to ensure that the heat dissipation cavity 1 of the heat dissipation structure can dissipate heat, at least one air inlet 11 should be in a conducting state and at least one air outlet 12 should be in a conducting state to ensure the normal operation of the heat dissipation duct.

[0069] In addition, the utility model also provides a power conversion device, including a sealed electronic cavity 4 and a heat dissipation structure arranged outside the electronic cavity 4 and used to dissipate heat from the electronic cavity 4, and 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 power conversion device having the heat dissipation structure should also have the corresponding technical effects, which will not be repeated here.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A heat dissipation structure, applied to a power conversion device, characterized in that: include: A heat dissipation cavity (1) is provided with an air inlet (11) and at least two air outlets (12), wherein the air outlets (12) are provided with a first preset interface; An air outlet changing component (2) is arranged at the first preset interface and is used to change the air outlet mode of the air outlet (12); The air outlet mode comprises a first air outlet mode and a second air outlet mode, wherein the first air outlet mode is configured such that the air outlet (12) is open; and the second air outlet mode is configured such that the air outlet (12) is closed.

2. The heat dissipation structure according to claim 1, characterized in that: The air outlet changing component (2) comprises a first blocking baffle (21) detachably connected to the first preset interface; In the second air outlet mode, the first blocking baffle (21) is installed on the first preset interface to block the air outlet (12).

3. The heat dissipation structure according to claim 2, characterized in that: The air outlet changing component (2) further comprises a first air guide plate (22) detachably connected to the first preset interface; In the first air outlet mode, the first air guide plate (22) is installed on the first preset interface to form a ventilation structure of the air outlet (12).

4. The heat dissipation structure according to claim 3, characterized in that: The air outlet direction of the first air guide plate (22) is adjustable.

5. The heat dissipation structure according to claim 4, characterized in that: The air outlet direction of the first air guide plate (22) can be adjusted in a range of 0°-180°.

6. The heat dissipation structure according to claim 1, characterized in that: The air outlet changing component (2) is configured as an air outlet grille. In the first air outlet mode, the air outlet grille is in an on state. In the second air outlet mode, the air outlet grille is in a off state.

7. The heat dissipation structure according to claim 6, characterized in that: The air outlet direction of the air outlet grille is adjustable and the adjustable range is configured to be 0°-180°.

8. The heat dissipation structure according to claim 1, characterized in that: The number of the air inlet (11) is one and is arranged on the back side of the heat dissipation cavity (1); the number of the air outlets (12) is three and are respectively arranged on the bottom and both sides of the heat dissipation cavity (1).

9. The heat dissipation structure according to any one of claims 1 to 7, characterized in that: The number of the air inlets (11) is plural, the air inlet (11) is provided with a second preset interface, and the heat dissipation structure further comprises an air inlet conversion component provided at the second preset interface and used for converting the air inlet mode of the air inlet (11); The air intake mode comprises a first air intake mode and a second air intake mode, wherein the first air intake mode is configured such that the air intake port (11) is turned on; and the second air intake mode is configured such that the air intake port (11) is closed.

10. The heat dissipation structure according to claim 9, characterized in that: The air inlet conversion component includes a second blocking baffle detachably connected to the second preset interface; In the second air outlet mode, the second blocking baffle is installed on the second preset interface to block the air inlet (11).

11. The heat dissipation structure according to claim 10, characterized in that: The air inlet conversion component further includes a second air guide plate detachably connected to the second preset interface; In the first air outlet mode, the second air guide plate is installed on the second preset interface to form a ventilation structure of the air inlet (11).

12. The heat dissipation structure according to claim 11, characterized in that: The air inlet direction of the second air guide plate is adjustable.

13. The heat dissipation structure according to claim 12, characterized in that: The adjustable range of the air inlet direction of the second air guide plate is 0°-180°.

14. The heat dissipation structure according to claim 9, characterized in that: The air intake conversion component is configured as an air intake grille. In the first air intake mode, the air intake grille is in an on state. In the second air intake mode, the air intake grille is in a closed state.

15. The heat dissipation structure according to claim 14, characterized in that: The air outlet direction of the air inlet grille is adjustable, and the adjustable range is configured to be 0°-180°.

16. A power conversion device, comprising a sealed electronic cavity (3) and a heat dissipation structure arranged outside the electronic cavity (3) and used to dissipate heat from the electronic cavity (3), characterized in that: The heat dissipation structure is the heat dissipation structure according to any one of claims 1 to 15.

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