Internal and external air cooling self-switching heat dissipation device and transformation equipment

Abstract

The utility model discloses an internal and external air cooling self-switching heat dissipation device and transformation equipment, which comprises a shell, a cooling assembly, an air guide module and a temperature control module, an air duct group is arranged in the shell, and the shell is provided with a first air inlet, a second air inlet and an air outlet which are all communicated with the air duct group; the first air inlet and the air outlet are both used for communicating with the containing cavity, the cooling assembly is arranged in the shell, the air guide module comprises a first fan and a second fan which are arranged in the air duct set, the air guide module at least comprises a first working state and a second working state, in the first working state, the first fan runs, the second fan stops, and in the second working state, the first fan runs; and in the second working state, the second draught fan operates, the first draught fan stops, the temperature control module is used for detecting a temperature signal of the containing cavity, the temperature control module controls the air guide module to operate in the first working state or the second working state according to the temperature signal, and the design is compact in structure, obvious in heat dissipation effect, good in durability and stable and reliable in operation.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to an internal and external air-cooled self-switching heat dissipation device and a transformer device. Background Art

[0002] Electrical equipment used in high voltage will generate a lot of heat. Traditional electrical equipment uses a thermostat with an exhaust fan to dissipate heat. An exhaust fan is installed on the cabin of the electrical equipment. When the temperature inside the cabin is higher than the temperature control threshold, the thermostat controls the exhaust fan to start and run to cool the inside of the electrical equipment. However, the exhaust fan operation has a limited effect on cooling the inside of the electrical equipment. When the temperature drops to the temperature control threshold, the thermostat controls the exhaust fan to stop. However, within a short period of time, the temperature will rise again and exceed the temperature control threshold. The thermostat will control the exhaust fan to start again. Repeated start and stop operations can easily cause damage to the exhaust fan, and the cooling capacity is limited, which cannot meet the heat dissipation needs of the electrical equipment. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes an internal and external air-cooled self-switching heat dissipation device and a transformer device, which has obvious heat dissipation effect, good durability, and stable and reliable operation.

[0004] According to an embodiment of the first aspect of the utility model, an internal and external air-cooled self-switching heat dissipation device is applied to an electrical device, wherein the electrical device comprises a cabin shell, wherein a receiving cavity is arranged in the cabin shell, wherein the internal and external air-cooled self-switching heat dissipation device comprises: a shell, wherein an air duct group is arranged in the shell, wherein the shell is provided with a first air inlet, a second air inlet and an air outlet, which are all connected to the air duct group, wherein the first air inlet and the air outlet are both used to communicate with the receiving cavity; a cooling component, which is arranged in the shell, wherein the cooling component is used to exchange heat with the air flow passing through; an air guide module, comprising a first fan and a second fan arranged in the air duct group; Two fans, the air guide module includes at least a first working state and a second working state, in the first working state, the first fan is running, the second fan is stopped, the first fan guides the airflow from the first air inlet into the air duct group, and flows out from the air outlet after passing through the cooling component, in the second working state, the second fan is running, the first fan is stopped, the second fan guides the airflow from the second air inlet into the air duct group, and flows out from the air outlet after passing through the cooling component; a temperature control module is used to detect the temperature signal of the accommodating cavity, and the temperature control module controls the air guide module to operate in the first working state or the second working state according to the temperature signal.

[0005] According to an embodiment of the utility model, an internal and external air-cooling self-switching heat dissipation device has at least the following beneficial effects:

[0006] In the utility model, the internal and external air-cooled self-switching heat dissipation device, the temperature control module detects the temperature in the accommodating chamber, and controls the air guide module to operate in the first working state or the second working state according to the temperature signal. In the first working state, the first fan is running, and the hot air in the accommodating chamber enters the air duct group from the first air inlet, and after being cooled by the cooling component, it flows back to the accommodating chamber from the air outlet. The cooling component can effectively cool the airflow, so that the airflow returning from the air outlet can greatly cool the accommodating chamber. When the temperature in the accommodating chamber still rises under the operation of the first fan, the air guide module can operate in the second working state, and the second fan is running. At this time, the wind flow is formed by using the air from the outside. Compared with the air from the first air inlet into the air duct group The wind flow has a lower temperature. Therefore, the wind flow temperature entering the accommodating chamber from the air outlet after passing through the cooling component is lower, which is more conducive to cooling the accommodating chamber. No matter it is the first working state or the second working state, the wind flow passes through the cooling component and is greatly cooled, so that the temperature in the accommodating chamber drops significantly. After the temperature of the accommodating chamber drops, the temperature control module controls the first fan or the second fan to stop, and the temperature will not rise suddenly, causing the temperature control module to control the first fan or the second fan to start again in a short time, and it is not easy to damage the first fan or the second fan. In addition, the first fan and the second fan and their respective air duct groups are integrated in the same shell with a compact structure. The design has obvious heat dissipation effect, good durability, and stable and reliable operation.

[0007] According to some embodiments of the present invention, the first air inlet is located above the air outlet.

[0008] According to some embodiments of the utility model, the air duct group includes a first air inlet section, a second air inlet section and an air outlet section, the first air inlet is connected to the first air inlet section, the second air inlet is connected to the second air inlet section, the air outlet is connected to the air outlet section, the first fan is arranged in the first air inlet section, the second fan is arranged in the second air inlet section, the first air inlet section and the second air inlet section are both connected to the hot air input end of the cooling component, and the air outlet section is connected to the cold air output end of the cooling component.

[0009] According to some embodiments of the utility model, the cooling component includes a plurality of stacked heat exchange fins, and the cooling component has a first heat exchange duct and a second heat exchange duct isolated from each other, the first heat exchange duct and the second heat exchange duct are both formed by two adjacent heat exchange fins, at least one surface of the heat exchange fin corresponds to the first heat exchange duct, and the other surface of the heat exchange fin opposite to the one surface corresponds to the second heat exchange duct so that the first heat exchange duct and the second heat exchange duct in the cooling component are alternately arranged, the first heat exchange duct is respectively connected to the hot air input end and the cold air output end, and the second heat exchange duct is respectively connected to the cold air input end and the hot air output end of the cooling component.

[0010] According to some embodiments of the present invention, the cooling component is in a rectangular shape, the hot air input end and the cold air output end are respectively located on two opposite sides of the cooling component, and the cold air input end and the hot air output end are located on two other opposite sides of the cooling component.

[0011] According to some embodiments of the present invention, the cooling assembly is detachably inserted into the shell.

[0012] The transformer device according to the second embodiment of the utility model includes the internal and external air-cooled self-switching heat dissipation device disclosed in any of the above embodiments.

[0013] The transformer device according to the embodiment of the utility model has at least the following beneficial effects:

[0014] The transformer equipment of the utility model applies the internal and external air-cooled self-switching heat dissipation device disclosed in any of the above embodiments, and has a compact structure, obvious heat dissipation effect, good durability, and stable and reliable operation.

[0015] According to some embodiments of the utility model, there are two internal and external air-cooled self-switching heat dissipation devices.

[0016] According to some embodiments of the present utility model, the transformer device includes a cabin shell, a containing chamber is provided in the cabin shell, the air outlet is communicated with the bottom of the containing chamber, and the first air inlet is communicated with the top of the containing chamber.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1It is a three-dimensional schematic diagram of one embodiment of the transformer device of the utility model;

[0020] Figure 2 It is a three-dimensional schematic diagram of one embodiment of the heat dissipation device of the utility model;

[0021] Figure 3 is a three-dimensional schematic diagram of a cooling component;

[0022] Figure 4 This is a front view of one embodiment of the heat dissipation device of the utility model;

[0023] Figure 5 for Figure 4 A cross-sectional view of section AA of one embodiment of the heat dissipation device of the utility model;

[0024] Figure 6 is a circuit diagram of a temperature sensor;

[0025] Figure 7 It is a circuit diagram of a controller, a first fan and a second fan.

[0026] Reference numerals:

[0027] Cabin shell 100; accommodating cavity 110; electrical component 120; internal and external air-cooled self-switching heat dissipation device 200; shell 300; first air inlet 310; second air inlet 320; air outlet 330; first air inlet section 340; second air inlet section 350; air outlet section 360; cooling assembly 400; heat exchange fins 410; first heat exchange air duct 420; second heat exchange air duct 430; first fan 510; second fan 520; temperature sensor 610; controller 620. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientations or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside", etc., are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] like Figure 1 - Figure 7 As shown, according to an embodiment of the first aspect of the utility model, an internal and external air-cooled self-switching heat dissipation device 200 is applied to electrical equipment, wherein the electrical equipment comprises a cabin shell 100, wherein a receiving chamber 110 is arranged in the cabin shell 100, wherein the internal and external air-cooled self-switching heat dissipation device 200 comprises a shell 300, a cooling component 400, an air guide module and a temperature control module, wherein an air duct group is arranged in the shell 300, wherein the shell 300 is provided with a first air inlet 310, a second air inlet 320 and an air outlet 330 which are all connected to the air duct group, wherein the first air inlet 310 and the air outlet 330 are both used to communicate with the receiving chamber 110, wherein the cooling component 400 is arranged in the shell 300, wherein the cooling component 400 is used to exchange heat with the airflow flowing therethrough, and the air guide module comprises a device A first fan 510 and a second fan 520 are placed in the air duct group, and the air guide module includes at least a first working state and a second working state. In the first working state, the first fan 510 runs and the second fan 520 stops. The first fan 510 guides the airflow to enter the air duct group from the first air inlet 310, and flows out from the air outlet 330 after passing through the cooling component 400. In the second working state, the second fan 520 runs, the first fan 510 stops, and the second fan 520 guides the airflow to enter the air duct group from the second air inlet 320, and flows out from the air outlet 330 after passing through the cooling component 400. The temperature control module is used to detect the temperature signal of the accommodating cavity 110. The temperature control module controls the air guide module to operate in the first working state or the second working state according to the temperature signal.

[0033] Among them, the electrical equipment can be a transformer equipment, a transmission equipment, a distribution equipment, etc., and electrical components 120 are arranged inside the electrical equipment, such as transformer windings, circuit breakers, power sub-modules, etc. During operation, the electrical components 120 will generate heat, and the internal and external air-cooled self-switching heat dissipation device 200 is used to dissipate the heat in the accommodating cavity 110.

[0034] The air guide module can be enclosed by sheet metal parts to form a corresponding air duct group, and a first air inlet 310, a second air inlet 320 and an air outlet 330 are arranged at corresponding positions. Figure 6 , 7 As shown, the temperature control module may include a temperature sensor 610 and a controller 620. The temperature sensor 610 is arranged in the cabin to detect the temperature in the accommodating cavity 110, and the controller 620 can be selected in the MCU or the CPU and its affiliated circuits. The controller 620 is respectively connected to the temperature sensor 610, the first fan 510 and the second fan 520 to control the air guide module to operate in the first working state or the second working state according to the temperature signal. The temperature control module may also include a plurality of electromagnetic relays. The controller 620 can control whether to supply power to the first fan 510 and the second fan 520 through the electromagnetic relay, thereby controlling the start and stop of the first fan 510 and the second fan 520.

[0035] In the present invention, the internal and external air-cooled self-switching heat dissipation device 200, the temperature control module detects the temperature in the accommodating chamber 110, and controls the air guide module to operate in the first working state or the second working state according to the temperature signal. In the first working state, the first fan 510 is in operation, and the hot air in the accommodating chamber 110 enters the air duct group from the first air inlet 310, is cooled by the cooling component 400, and then flows back to the accommodating chamber 110 from the air outlet 330. The cooling component 400 can effectively cool the airflow, so that the airflow returning from the air outlet 330 can significantly cool the accommodating chamber 110. When the first fan 510 is in operation, the temperature in the accommodating chamber 110 still rises. At this time, the air guide module can operate in the second working state, and the second fan 520 is in operation. At this time, the air outside is used to form the airflow. Compared with the air outside that flows into the air duct group from the first air inlet 310, the air outside is The wind flow has a lower temperature. Therefore, after passing through the cooling component 400, the wind flow entering the accommodating chamber 110 from the air outlet 330 has a lower temperature, which is more conducive to cooling the accommodating chamber 110. Regardless of whether it is the first working state or the second working state, the wind flow passes through the cooling component 400 and is greatly cooled, so that the temperature in the accommodating chamber 110 drops significantly. After the temperature of the accommodating chamber 110 drops, the temperature control module controls the first fan 510 or the second fan 520 to stop, and the temperature will not rise suddenly, causing the temperature control module to control the first fan 510 or the second fan 520 to start again in a short time, and it is not easy to damage the first fan 510 or the second fan 520. In addition, the first fan 510 and the second fan 520 and their respective air duct groups are integrated in the same shell 300 with a compact structure. The design has obvious heat dissipation effect, good durability, and stable and reliable operation.

[0036] In some embodiments of the present invention, the first air inlet 310 is located above the air outlet 330. Generally speaking, in the accommodating chamber 110, the gas with higher temperature will float up, while the gas with lower temperature will be located below the accommodating chamber 110. In the first working state, the first fan 510 is running, and the gas with higher temperature can flow into the air duct group from the first air inlet 310 above and be cooled by the cooling component 400, and then be discharged from the air outlet 330 below the accommodating chamber 110. Driven by the wind flow, the cold air at the bottom of the accommodating chamber 110 will also be pressurized to pass through the electrical component 120, and after sufficient heat exchange with the electrical component 120, enter the air duct group from the first air inlet 310 above.

[0037] In some embodiments of the present invention, Figure 2 , 4As shown in Figure 5, the air duct group includes a first air inlet section 340, a second air inlet section 350 and an air outlet section 360, the first air inlet 310 is connected to the first air inlet section 340, the second air inlet 320 is connected to the second air inlet section 350, the air outlet 330 is connected to the air outlet section 360, the first fan 510 is arranged in the first air inlet section 340, the second fan 520 is arranged in the second air inlet section 350, the first air inlet section 340 and the second air inlet section 350 are both connected to the hot air input end of the cooling component 400, and the air outlet section 360 is connected to the cold air output end of the cooling component 400.

[0038] The air duct for guiding air of the first fan 510 and the air duct for guiding air of the second fan 520 are both enclosed by the outer shell of the same air guide module, but do not interfere with each other and have a compact structure. Specifically, the cooling component 400 is located at the transfer position of the air guide module, the first air inlet section 340 and the second air inlet section 350 are both connected to the hot air input end of the cooling component 400, and the cold air output end of the cooling component 400 is both connected to the air outlet section 360. When the first fan 510 is in operation, the airflow passes through the cooling component 400 from the first air inlet section 340 and then enters the air outlet section 360. When the second fan 520 is in operation, the airflow passes through the cooling component 400 from the second air inlet section 350 and enters the air outlet section 360.

[0039] In some embodiments of the present invention, Figure 3 As shown, the cooling component 400 includes a plurality of stacked heat exchange fins 410, and the cooling component 400 has a first heat exchange air duct 420 and a second heat exchange air duct isolated from each other, the first heat exchange air duct 420 and the second heat exchange air duct 430 are both formed by two adjacent heat exchange fins 410, and at least one surface of the heat exchange fin 410 corresponds to the first heat exchange air duct 420, and the other surface of the heat exchange fin 410 opposite to the one surface corresponds to the second heat exchange air duct so that the first heat exchange air duct 420 and the second heat exchange air duct in the cooling component 400 are alternately arranged, the first heat exchange air duct 420 is respectively connected to the hot air input end and the cold air output end, and the second heat exchange air duct 430 is respectively connected to the cold air input end and the hot air output end of the cooling component.

[0040] The heat exchange fins 410 can be made of hydrophilic aluminum foil material with good thermal conductivity. Two adjacent heat exchange fins 410 are spaced apart and connected to enclose a space. For example, three heat exchange fins 410 are stacked in sequence. A first heat exchange duct 420 is formed between the two upper heat exchange fins 410, and a second heat exchange duct is formed between the two lower heat exchange fins 410. Therefore, no matter whether the first fan 510 or the second fan 520 is running, hot air enters the first heat exchange duct 420 from the hot air input end and then flows out from the cold air output end, while the outside air with a lower temperature can be input into the second heat exchange duct from the cold air input end and then flows out from the hot air output end. The airflow of the first heat exchange duct 420 and the airflow of the second heat exchange duct are exchanged through the heat exchange fins 410 in between.

[0041] Specifically, the cooling component 400 is in a rectangular shape, the hot air input end and the cold air output end are respectively located at two opposite sides of the cooling component 400, and the cold air input end and the hot air output end are located at two other opposite sides of the cooling component 400.

[0042] The airflows flowing through the first heat exchange air duct 420 and the second heat exchange air duct are smooth, which can accelerate the flow of airflow for heat exchange. In the connection structure of the heat exchange fins 410, the heat exchange fins 410 are rectangular, and along the extension direction of the first heat exchange air duct 420, the two adjacent heat exchange fins 410 can be connected on both sides to form a relatively isolated first heat exchange air duct 420. Similarly, along the extension direction of the second heat exchange air duct, the two adjacent heat exchange fins 410 can be connected on both sides to form a relatively isolated second heat exchange air duct.

[0043] In some embodiments of the present invention, the heat dissipation fins may be semiconductor refrigeration fins, one surface of which is a heating surface and the other surface is a cooling surface, so that the heat dissipation can be achieved by utilizing external wind flow and cooling the wind flow entering the accommodating cavity 110 .

[0044] In some embodiments of the present invention, when the temperature of the accommodating chamber 110 is higher than the first temperature threshold and the temperature of the accommodating chamber 110 is lower than the second temperature threshold, the temperature control module controls the air guide module to operate in the first working state;

[0045] When the temperature of the accommodating cavity 110 is higher than the second temperature threshold, the temperature control module controls the air guide module to operate in the second working state.

[0046] The first temperature threshold may be 55°C, and the second temperature threshold may be 70°C.

[0047] In some embodiments of the utility model, the temperature control module can also control the air guide module to have a third working state, a fourth working state and a fifth working state. In the third working state, the first fan 510 runs and the second fan 520 stops. In the fourth working state, the first fan 510 runs and the second fan 520 runs. In the fifth working state, the first fan 510 stops and the second fan 520 runs.

[0048] When the temperature of the accommodating cavity 110 is in the first temperature range, the air guide module is controlled to be in the third working state. When the temperature of the accommodating cavity 110 is in the second temperature range, the air guide module is controlled to be in the fourth working state. When the temperature of the accommodating cavity 110 is in the third temperature range, the air guide module is controlled to be in the fifth working state. Specifically, the first temperature range is 55-70°C, the second temperature range is 70-75°C, and the third temperature range is 75-90°C.

[0049] In some embodiments of the present invention, Figure 2 , 3 As shown in FIGS. 4 and 5 , the cooling assembly 400 is detachably inserted into the shell 300 . The cooling assembly 400 may accumulate dust and affect the heat dissipation capacity after long-term use. The staff can disassemble the cooling assembly 400 for cleaning or replacement.

[0050] Specifically, the shell 300 is provided with a mounting opening, the cooling assembly 400 can be inserted into the mounting opening to enter the air duct group, and the outer shell of the cooling assembly 400 and the shell 300 can be connected by screws or buckles.

[0051] The transformer device according to the second embodiment of the utility model includes the internal and external air-cooled self-switching heat dissipation device 200 disclosed in any of the above embodiments.

[0052] The transformer device of the utility model applies the internal and external air-cooled self-switching heat dissipation device 200 disclosed in any of the above embodiments, and has a compact structure, obvious heat dissipation effect, good durability, and stable and reliable operation.

[0053] In some embodiments of the present invention, Figure 1 , 6 As shown in FIG. 7 , there are two internal and external air-cooled self-switching heat dissipation devices 200 , and there are two corresponding first fans 510 and second fans 520 . The temperature control module can control the start and stop of each first fan 510 and each second fan 520 .

[0054] In some embodiments of the present invention, the transformer device includes a cabin shell 100, in which a accommodating chamber 110 is arranged, the air outlet 330 is connected to the bottom of the accommodating chamber 110, and the first air inlet 310 is connected to the top of the accommodating chamber 110. In a first working state, the first fan 510 is running, and the gas with a higher temperature can flow into the air duct group from the first air inlet 310 at the top and be cooled by the cooling component 400, and then be discharged from the air outlet 330 at the bottom of the accommodating chamber 110. Driven by the wind flow, the cold air at the bottom of the accommodating chamber 110 will also be pressurized and pass through the electrical component 120, and then enter the air duct group from the first air inlet 310 at the top after sufficient heat exchange with the electrical component 120.

[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An internal and external air-cooled self-switching heat dissipation device, applied to electrical equipment, the electrical equipment comprising a housing, the housing having a containing cavity, characterized in that: The internal and external air-cooling self-switching heat dissipation device comprises: A shell body, in which an air duct group is arranged, the shell body is provided with a first air inlet, a second air inlet and an air outlet, all of which are connected to the air duct group, and the first air inlet and the air outlet are both used to communicate with the accommodating cavity; A cooling component is disposed in the housing, and is used for exchanging heat with the wind flowing therethrough; The air guide module comprises a first fan and a second fan arranged in the air duct group, the air guide module comprises at least a first working state and a second working state, in the first working state, the first fan is running, the second fan is stopped, the first fan guides the airflow to enter the air duct group from the first air inlet, and flows out from the air outlet after passing through the cooling component, in the second working state, the second fan is running, the first fan is stopped, the second fan guides the airflow to enter the air duct group from the second air inlet, and flows out from the air outlet after passing through the cooling component; The temperature control module is used to detect the temperature signal of the accommodating cavity, and the temperature control module controls the air guide module to operate in the first working state or the second working state according to the temperature signal.

2. The internal and external air-cooling self-switching heat dissipation device according to claim 1, characterized in that: The first air inlet is located above the air outlet.

3. The internal and external air-cooling self-switching heat dissipation device according to claim 1, characterized in that: The air duct group includes a first air inlet section, a second air inlet section and an air outlet section, the first air inlet is connected to the first air inlet section, the second air inlet is connected to the second air inlet section, the air outlet is connected to the air outlet section, the first fan is arranged in the first air inlet section, the second fan is arranged in the second air inlet section, the first air inlet section and the second air inlet section are both connected to the hot air input end of the cooling component, and the air outlet section is connected to the cold air output end of the cooling component.

4. The internal and external air-cooling self-switching heat dissipation device according to claim 3, characterized in that: The cooling component includes a plurality of stacked heat exchange fins, and the cooling component has a first heat exchange duct and a second heat exchange duct isolated from each other, the first heat exchange duct and the second heat exchange duct are formed by two adjacent heat exchange fins, at least one surface of the heat exchange fin corresponds to the first heat exchange duct, and the other surface of the heat exchange fin opposite to the one surface corresponds to the second heat exchange duct so that the first heat exchange duct and the second heat exchange duct in the cooling component are alternately arranged, the first heat exchange duct is respectively connected to the hot air input end and the cold air output end, and the second heat exchange duct is respectively connected to the cold air input end and the hot air output end of the cooling component.

5. The internal and external air-cooling self-switching heat dissipation device according to claim 4, characterized in that: The cooling component is in a rectangular shape, the hot air input end and the cold air output end are respectively located on two opposite sides of the cooling component, and the cold air input end and the hot air output end are located on two other opposite sides of the cooling component.

6. The internal and external air-cooling self-switching heat dissipation device according to claim 1, characterized in that: The cooling assembly is detachably inserted into the shell.

7. A transformer device, characterized in that: It comprises at least one internal / external air-cooling self-switching heat dissipation device as claimed in any one of claims 1 to 6.

8. A voltage transformation device according to claim 7, characterized in that: There are two internal and external air-cooled self-switching heat dissipation devices.

9. A voltage transformation device according to claim 7, characterized in that: The transformer device comprises a housing shell, a containing chamber is arranged in the housing shell, the air outlet is communicated with the lower part of the containing chamber, and the first air inlet is communicated with the upper part of the containing chamber.

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