Mesh construction type phase-change air-cooled converter

Abstract

The invention discloses a net-forming type phase-change air-cooled converter, and belongs to the technical field of power electronic equipment. The cabinet body comprises a cabinet body, an outer circulation air duct and an inner circulation air duct, and the outer circulation air duct is used for cooling the first heating component and the second heating component; and the internal circulation air duct is used for cooling the third heating component and the fourth heating component. Elements in the cabinet body are cooled through the outer circulation air duct and the inner circulation air duct, the heat dissipation requirements of a plurality of heating pieces in the net-forming converter are met, the heat dissipation performance and the power density are improved, and meanwhile the manufacturing cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of power electronic equipment, and in particular relates to a grid-type phase-change air-cooled converter. Background Art

[0002] Currently, most outdoor inverters use forced air cooling for heat dissipation. However, as outdoor cabinets become increasingly powerful and the power density of the entire cabinet increases under grid-connected conditions, it is becoming increasingly difficult to improve the heat dissipation performance of the radiator solution using skived-tooth heating tubes. Water cooling requires a separate cooling system and a chiller to cool the cooling water, significantly increasing manufacturing costs. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a grid-type phase-change air-cooled converter that performs cooling and heat dissipation by phase change, thereby improving heat dissipation performance and power density and reducing manufacturing costs.

[0004] The present invention provides the following technical solutions: A grid-type phase-change air-cooled converter includes a cabinet, the interior of which is divided into a heat dissipation cavity and an air outlet cavity at the bottom of the cabinet, wherein a first heating component, a second heating element, a third heating component and a fourth heating element are arranged in the cabinet; The external circulation air duct includes a first phase-change heat dissipation condensation end, a first exhaust module, and a second phase-change heat dissipation component. The first exhaust module is arranged between the first phase-change heat dissipation condensation end and the second phase-change heat dissipation component, and the first heating component is arranged on the second phase-change heat dissipation component. The first exhaust module inhales cold air passing through the first phase-change heat dissipation condensation end. The cold air passes through the second phase-change heat dissipation component and the second heating component in sequence, and is then discharged from the cabinet through the air outlet cavity at the bottom of the cabinet. The internal circulation air duct includes a second exhaust module and a first phase change heat dissipation volatile end. The fourth heating element is arranged in the heat dissipation cavity, and the third heating component is arranged on one side of the first phase change heat dissipation volatile end. The second exhaust module inhales the hot air flowing through the fourth heating element, and the hot air passes through the first phase change heat dissipation volatile end and the third heating component in turn and is discharged into the heat dissipation cavity.

[0005] As an optional technical solution of the present invention, it also includes a first cabinet door, an air inlet cover and a first phase change heat dissipation component cover; The first cabinet door is arranged on one side of the cabinet body; The air inlet cover is arranged on the outer side of the first cabinet door, and the first phase change heat dissipation component cover is arranged on the inner side of the first cabinet door; The first phase change heat dissipation component cover is provided with a first air outlet, a first internal circulation air outlet and an internal circulation air inlet in sequence from top to bottom; The first air outlet includes a condensation air outlet and a first side air outlet and a second side air outlet located on both sides of the condensation air outlet; the first phase change heat dissipation condensation end is arranged in the condensation air outlet; The first phase-change heat dissipation and volatilization end is arranged in the first internal circulation air outlet.

[0006] As an optional technical solution of the present invention, the second phase-change heat dissipation component is fixed in the heat dissipation cavity through a support plate in the cabinet, and the second phase-change heat dissipation component includes a second phase-change heat dissipation condensation end, a second phase-change heat dissipation volatilization end and a second phase-change heat dissipation component cover; The second phase-change heat dissipation condensation end is located above the second phase-change heat dissipation volatile end, and the second phase-change heat dissipation volatile end is located in the second phase-change heat dissipation component housing; The first heating component is arranged on the second phase-change heat dissipation end.

[0007] As an optional technical solution of the present invention, the external circulation air duct further includes an intermediate air duct, the two ends of which are respectively connected to the first air outlet and the second phase change heat dissipation component cover, and sealing strips are provided at the connection points; The first exhaust module is arranged in the middle air duct.

[0008] As an optional technical solution of the present invention, it also includes a second cabinet door, a through ventilation duct and a second heating element cover; The second cabinet door is provided on the other side of the cabinet body, and the second cabinet door is provided with a second air outlet and a third air outlet; The through ventilation duct is arranged on the outer side of the second cabinet door, the top of the through ventilation duct is connected to the second air outlet, and the bottom of the through ventilation duct is connected to the third air outlet; The through air duct is connected to the second phase change heat dissipation component housing through the second air outlet, and a sealing strip is provided at the connection; The top of the second heating element cover is connected to the third air outlet, and a sealing strip is provided at the connection, and the bottom is connected to the air outlet cavity at the bottom of the cabinet; the second heating element is arranged in the second heating element cover.

[0009] As an optional technical solution of the present invention, the first heating components are provided in three groups in parallel; The first exhaust module, the middle air duct, and the second phase-change heat dissipation component constitute a heat dissipation group of the first heating component. The heat dissipation group is provided with three groups and is independently arranged; The first exhaust module in each heat dissipation group is connected to the first air outlet, and the hot air in each heat dissipation group that flows through the second phase change heat dissipation component is directed to the second air outlet.

[0010] As an optional technical solution of the present invention, a main air inlet is provided at the bottom of the air inlet cover, and the height of the main air inlet is lower than the first air outlet.

[0011] As an optional technical solution of the present invention, the internal circulation air duct further includes an internal circulation intermediate air duct; The inner circulation middle air duct is arranged between the first phase change heat dissipation volatile end and the third heating component, and a sealing strip is provided at the connection between the first phase change heat dissipation volatile end and the third heating component.

[0012] As an optional technical solution of the present invention, the third heating component includes a third heating element and a third heating element cover; The third heating element cover is fixed in the heat dissipation cavity through a support plate in the cabinet; The third heating element is located in the third heating element housing; The inner circulation intermediate air duct is connected to the third heating element cover; the bottom of the third heating element cover is provided with a second inner circulation air outlet for discharging hot air into the heat dissipation cavity.

[0013] As an optional technical solution of the present invention, a main air outlet for discharging hot air out of the cabinet is provided on one side of the air outlet cavity at the bottom of the cabinet.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The mesh-type phase-change air-cooled converter provided by the present invention realizes the heat dissipation requirements of multiple heating components inside the mesh-type converter by setting external circulation air ducts and internal circulation air ducts, solving the problem that the radiator of the skived-tooth heating tube with forced air cooling cannot achieve high-power application. At the same time, it also avoids the problem of high cost caused by the need to design a separate water cooling system when using a water cooling method, thereby improving power density and heat dissipation performance and reducing manufacturing costs.

[0015] 2. The grid-type phase-change air-cooled converter provided by the present invention has two sets of heat dissipation ducts that are independent and isolated from each other, and all key components are arranged in the cabinet. External impurities such as moisture, salt spray, sand and dust are not easy to enter the cabinet, and the protection performance is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 1 is a schematic structural diagram of a grid-type phase-change air-cooled converter according to an embodiment of the present invention; Figure 2 is a cross-sectional view of a grid-type phase-change air-cooled converter according to an embodiment of the present invention; Figure 3 2 is a schematic cross-sectional view of the top structure of a grid-type phase-change air-cooled converter according to an embodiment of the present invention; Figure 4 2. This is a schematic diagram of the first cabinet door structure of a grid-type phase-change air-cooled converter according to an embodiment of the present invention; Figure 5 2 is a schematic diagram of the second cabinet door structure of the grid-type phase-change air-cooled converter in an embodiment of the present invention.

[0017] The following are marked in the figure: 2, second exhaust module; 3, air cavity; 4, main air inlet; 5, air inlet cover; 6, first phase change heat dissipation component; 601, first phase change heat dissipation condensation end; 602, first phase change heat dissipation evaporation end; 603, first phase change heat dissipation component housing; 7, cabinet; 8, first exhaust module; 9, middle air duct; 10, second phase change heat dissipation component; 1001, second phase change heat dissipation condensation end; 1002, second phase change heat dissipation evaporation end; 1003, second phase change heat dissipation component housing; 11, second cabinet door; 12, through air duct; 13, first heating component; 14, third heating component; 1401, third heating element; 140 2. Third heating element cover; 15. Heat dissipation cavity; 16. Second heating element; 17. Main air outlet; 18. Second heating element cover; 19. Support plate; 20. Cabinet bottom partition plate; 21. Support member; 22. Internal circulation intermediate air duct; 23. Fourth heating element; 24. First cabinet door; 25. Cabinet bottom air outlet cavity; 26. First side wall; 27. Second side wall; 28. First air outlet; 2801. Condensation air outlet; 2802. First side air outlet; 2803. Second side air outlet; 29. ​​First internal circulation air outlet; 30. Internal circulation air inlet; 31. Second air outlet; 32. Third air outlet; 33. Second internal circulation air outlet. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0019] Example 1 like Figure 1 and 2 As shown, this embodiment provides a grid-type phase-change air-cooled converter, comprising: The cabinet body 7 includes a heat dissipation cavity 15 and a cabinet bottom air outlet cavity 25 separated by a cabinet bottom partition plate 20 . The cabinet body 7 is provided with a first heating component 13 , a second heating element 16 , a third heating component 14 and a fourth heating element 23 .

[0020] The external circulation air duct is used to dissipate heat for the first heating component 13 and the second heating element 16; the external circulation air duct includes a first phase change heat dissipation condensation end 601, a first exhaust module 8 and a second phase change heat dissipation component 10, the first exhaust module 8 is arranged between the first phase change heat dissipation condensation end 601 and the second phase change heat dissipation component 10, and the first heating component 13 is arranged on the second phase change heat dissipation component 10; the first exhaust module 8 inhales cold air passing through the first phase change heat dissipation condensation end 601, and the cold air passes through the second phase change heat dissipation component 10 and the second heating element 16 in turn, and is discharged from the cabinet body 7 through the cabinet bottom air outlet cavity 25.

[0021] The internal circulation air duct is used to dissipate heat for the third heating component 14 and the fourth heating component 23; the internal circulation air duct includes a second exhaust module 2 and a first phase change heat dissipation volatile end 602, the fourth heating component 23 is arranged in the heat dissipation cavity 15, and the third heating component 14 is arranged on one side of the first phase change heat dissipation volatile end 602; the second exhaust module 2 inhales the hot air flowing through the fourth heating component 23, and the hot air passes through the first phase change heat dissipation volatile end 602 and the third heating component 14 in turn and is discharged into the heat dissipation cavity 15.

[0022] Example 2 This embodiment provides an implementation method of each structure based on embodiment 1.

[0023] like Figure 3 As shown, a first side wall 26 and a second side wall 27 parallel to each other are provided on the front and rear sides.

[0024] like Figure 1 and Figure 4 As shown, it also includes a first cabinet door 24, an air inlet cover 5 and a first phase-change heat dissipation component cover 603. The first cabinet door 24 is arranged on one side of the cabinet body 7. The air inlet cover 5 is arranged on the outside of the first cabinet door 24, and the first phase-change heat dissipation component cover 603 is arranged on the inside of the first cabinet door 24; the first phase-change heat dissipation component cover 603 is provided with a first air outlet 28, a first internal circulation air outlet 29 and an internal circulation air inlet 30 from top to bottom; the first air outlet 28 includes a condensation air outlet 2801 and a first side air outlet 2802 and a second side air outlet 2803 located on both sides of the condensation air outlet 2801; the first phase-change heat dissipation condensation end 601 is arranged in the condensation air outlet 2801; the first phase-change heat dissipation volatilization end 602 is arranged in the first internal circulation air outlet 29. The heat dissipation performance of the first phase-change heat dissipation component 6 can be controlled by adjusting the cross-sectional dimensions of the condensation air outlet 2801 , the first side air outlet 2802 , and the second side air outlet 2803 .

[0025] In this embodiment, the first phase change heat dissipation condensation end 601 , the first phase change heat dissipation volatilization end 602 and the first phase change heat dissipation component cover 603 constitute the first phase change heat dissipation component 6 .

[0026] Furthermore, a main air inlet 4 is provided at the bottom of the air inlet cover 5. The height of the main air inlet 4 is lower than the first air outlet 28, which is more conducive to preventing rainwater, dust and other debris from being absorbed into the cabinet. Steel meshes of different mesh sizes can also be set at the main air inlet 4 to improve the protection performance of the entire cabinet.

[0027] like Figure 1 and Figure 2As shown, the second phase-change heat dissipation assembly 10 is fixed in the heat dissipation cavity 15 via a support plate 19 in the cabinet 7. The second phase-change heat dissipation assembly 10 includes a second phase-change heat dissipation condensation end 1001, a second phase-change heat dissipation evaporation end 1002, and a second phase-change heat dissipation assembly housing 1003. The second phase-change heat dissipation condensation end 1001 is located above the second phase-change heat dissipation evaporation end 1002, and the second phase-change heat dissipation evaporation end 1002 is located in the second phase-change heat dissipation assembly housing 1003. The first heating assembly 13 is provided on the second phase-change heat dissipation evaporation end 1002. The first heating assembly 13 uses an IGBT power assembly as the main power device for heat generation. It includes multiple heating elements. The heat generated by the first heating assembly 13 is exchanged through the volatilization and condensation of the medium in the second phase-change heat dissipation condensation end 1001 and the second phase-change heat dissipation evaporation end 1002, and is ultimately carried out of the cabinet by air passing through the second phase-change heat dissipation condensation end 1001.

[0028] Furthermore, the condensation and volatilization ends in the first phase-change heat dissipation component 6 and the second phase-change heat dissipation component 10 are located in spaces that are isolated and closed from each other, and heat exchange is achieved only through volatilization and condensation of the internal medium.

[0029] like Figure 1 and Figure 4 As shown, the external circulation air duct also includes an intermediate air duct 9, whose two ends are respectively connected to the first air outlet 28 and the second phase change heat dissipation component cover 1003, and sealing strips are provided at the connection points; the first exhaust module 8 is arranged in the intermediate air duct 9.

[0030] like Figure 1 and Figure 5 As shown, it also includes a second cabinet door 11, a through air duct 12 and a second heating element cover 18; the second cabinet door 11 is arranged on the other side of the cabinet body 7, and the second cabinet door 11 is provided with a second air outlet 31 and a third air outlet 32; the through air duct 12 is arranged on the outside of the second cabinet door 11, and the top of the through air duct 12 is connected to the second air outlet 31, and the bottom is connected to the third air outlet 32; the through air duct 12 is connected to the second phase change heat dissipation component cover 1003 through the second air outlet 31, and a sealing strip is provided at the connection; the top of the second heating element cover 18 is connected to the third air outlet 32, and a sealing strip is provided at the connection, and the bottom is connected to the cabinet bottom air outlet cavity 25; the second heating element 16 is arranged in the second heating element cover 18. Among them, the secondary hot air flowing through the second phase change heat dissipation condensation end 1001 is further guided into the second heating element cover 18 to cool the second heating element 16, and the second heating element 16 is an inductor. By setting sealing strips at the connection points, an external circulation air duct is formed which is completely isolated from the components in the cabinet, and is completely sealed and isolated from the components in the cabinet.

[0031] like Figure 1As shown, the internal circulation air duct also includes an internal circulation intermediate air duct 22; the internal circulation intermediate air duct 22 is arranged between the first phase change heat dissipation volatile end 602 and the third heating component 14, and a sealing strip is provided at the connection between the first phase change heat dissipation volatile end 602 and the third heating component 14 to form a closed internal circulation air duct.

[0032] like Figure 1 and 2 As shown, the third heating component 14 includes a third heating element 1401 and a third heating element housing 1402; the third heating element housing 1402 is fixed to the heat dissipation cavity 15 via a support plate 19 within the cabinet 7; the third heating element 1401 is located within the third heating element housing 1402; the internal circulation intermediate air duct 22 communicates with the third heating element housing 1402; and a second internal circulation air outlet 33 is provided at the bottom of the third heating element housing 1402 for discharging hot air into the heat dissipation cavity 15. The third heating component 14 is a capacitor component.

[0033] like Figure 1 As shown, a main air outlet 17 for discharging hot air out of the cabinet body 7 is provided on one side of the cabinet bottom air outlet cavity 25 .

[0034] like Figure 1 As shown, the fourth heating element 23 is fixed on the support 21 connected to the cabinet 7. The fourth heating element 23 adopts a circuit breaker and fuse assembly. The second exhaust module 2 is arranged in the air cavity 3 in the first phase change heat dissipation component housing 603.

[0035] In this embodiment, the first heating components 13 are arranged in three groups in parallel; the first exhaust module 8, the middle air duct 9, and the second phase change heat dissipation component 10 constitute the heat dissipation group of the first heating component 13. Figure 3 As shown, in order to ensure the heat dissipation balance of the three groups of first heating components 13, the heat dissipation groups are provided with three groups, and are independently arranged with each other; the first exhaust module 8 in each of the heat dissipation groups is connected to the first air outlet 28, and the hot air flowing through the second phase change heat dissipation component 10 in each of the heat dissipation groups is led to the second air outlet 31.

[0036] In this embodiment, the first exhaust module 8 is the power source of the external circulation air duct. The first exhaust module 8 draws in cold air that passes through the air inlet hood 5 and the first phase change heat dissipation condensation terminal 601. The cold air then passes through the second phase change heat dissipation component 10, the through-air duct 12, and the second heating element 16 in sequence, and is then discharged from the cabinet body 7 through the cabinet bottom air outlet cavity 25. The cold air from outside the cabinet that enters through the air inlet hood 5 becomes sub-cold air after passing through the first phase change heat dissipation condensation terminal 601, then becomes sub-hot air after passing through the second phase change heat dissipation component 10, and then becomes hot air after passing through the second heating element 16, and finally is discharged from the cabinet body 7 through the cabinet bottom air outlet cavity 25.

[0037] The second exhaust module 2 is the power source for the internal circulation air duct. It draws hot air through the fourth heating element 23 via the internal circulation air inlet 30. The hot air then passes through the first phase-change heat dissipation evaporation end 602, the internal circulation intermediate air duct 22, and the third heating element 14 before being discharged into the heat dissipation cavity 15 via the second internal circulation air outlet 33.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships 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, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0039] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A grid-type phase-change air-cooled converter, characterized in that: include: A cabinet (7) is internally divided into a heat dissipation cavity (15) and a cabinet bottom air outlet cavity (25), wherein a first heating component (13), a second heating element (16), a third heating component (14) and a fourth heating element (23) are provided in the cabinet (7); The external circulation air duct comprises a first phase-change heat dissipation condensation end (601), a first exhaust module (8) and a second phase-change heat dissipation component (10), wherein the first exhaust module (8) is arranged between the first phase-change heat dissipation condensation end (601) and the second phase-change heat dissipation component (10), and the first heating component (13) is arranged on the second phase-change heat dissipation component (10); the first exhaust module (8) inhales cold air passing through the first phase-change heat dissipation condensation end (601), and the cold air passes through the second phase-change heat dissipation component (10) and the second heating component (16) in sequence, and is then discharged from the cabinet body (7) through the cabinet bottom air outlet cavity (25); The internal circulation air duct comprises a second exhaust module (2) and a first phase-change heat dissipation volatile end (602); the fourth heating element (23) is arranged in the heat dissipation cavity (15); and the third heating component (14) is arranged on one side of the first phase-change heat dissipation volatile end (602); the second exhaust module (2) inhales hot air flowing through the fourth heating element (23), and the hot air passes through the first phase-change heat dissipation volatile end (602) and the third heating component (14) in sequence and is then discharged into the heat dissipation cavity (15).

2. The grid-type phase-change air-cooled converter according to claim 1 is characterized in that: It also includes a first cabinet door (24), an air inlet cover (5), and a first phase change heat dissipation component cover (603); The first cabinet door (24) is provided on one side of the cabinet body (7); The air inlet cover (5) is arranged on the outside of the first cabinet door (24), and the first phase change heat dissipation component cover (603) is arranged on the inside of the first cabinet door (24); The first phase-change heat dissipation component housing (603) is provided with a first air outlet (28), a first internal circulation air outlet (29) and an internal circulation air inlet (30) in sequence from top to bottom; The first air outlet (28) comprises a condensation air outlet (2801) and a first side air outlet (2802) and a second side air outlet (2803) located on both sides of the condensation air outlet (2801); the first phase change heat dissipation condensation end (601) is provided in the condensation air outlet (2801); The first phase-change heat dissipation volatilization end (602) is arranged in the first internal circulation air outlet (29).

3. The grid-type phase-change air-cooled converter according to claim 2, characterized in that: The second phase-change heat dissipation component (10) is fixed in the heat dissipation cavity (15) via a support plate (19) in the cabinet (7), and the second phase-change heat dissipation component (10) comprises a second phase-change heat dissipation condensation end (1001), a second phase-change heat dissipation volatilization end (1002), and a second phase-change heat dissipation component cover (1003); The second phase-change heat dissipation condensation end (1001) is located above the second phase-change heat dissipation volatile end (1002), and the second phase-change heat dissipation volatile end (1002) is located inside the second phase-change heat dissipation component housing (1003); The first heating component (13) is provided on the second phase-change heat dissipation volatile end (1002).

4. The grid-type phase-change air-cooled converter according to claim 3 is characterized in that: The external circulation air duct further comprises an intermediate air duct (9), the two ends of the intermediate air duct (9) being respectively connected to the first air outlet (28) and the second phase-change heat dissipation component housing (1003), and sealing strips are provided at the connection points; The first air extraction module (8) is arranged in the middle air duct (9).

5. The grid-type phase-change air-cooled converter according to claim 4 is characterized in that: It also includes a second cabinet door (11), a through ventilation duct (12), and a second heating element cover (18); The second cabinet door (11) is provided on the other side of the cabinet body (7), and the second cabinet door (11) is provided with a second air outlet (31) and a third air outlet (32); The through ventilation duct (12) is arranged on the outside of the second cabinet door (11), the top of the through ventilation duct (12) is connected to the second air outlet (31), and the bottom is connected to the third air outlet (32); The through air duct (12) is connected to the second phase-change heat dissipation component housing (1003) via the second air outlet (31), and a sealing strip is provided at the connection; The top of the second heating element housing (18) is connected to the third air outlet (32), and a sealing strip is provided at the connection, and the bottom is connected to the cabinet bottom air outlet cavity (25); the second heating element (16) is arranged in the second heating element housing (18).

6. The grid-type phase-change air-cooled converter according to claim 5, characterized in that: The first heating components (13) are provided in three groups in parallel; The first exhaust module (8), the intermediate air duct (9), and the second phase-change heat dissipation component (10) constitute a heat dissipation group of the first heating component (13), and the heat dissipation groups are provided in three groups and are independently arranged; The first exhaust module (8) in each heat dissipation group is connected to the first air outlet (28), and the hot air flowing through the second phase-change heat dissipation component (10) in each heat dissipation group is directed to the second air outlet (31).

7. The grid-type phase-change air-cooled converter according to claim 2, characterized in that: A main air inlet (4) is provided at the bottom of the air inlet cover (5), and the height of the main air inlet (4) is lower than the first air outlet (28).

8. The grid-type phase-change air-cooled converter according to claim 1, characterized in that: The internal circulation air duct further includes an internal circulation intermediate air duct (22); The inner circulation intermediate air duct (22) is provided between the first phase-change heat dissipation volatile end (602) and the third heating component (14), and sealing strips are provided at the connection points with the first phase-change heat dissipation volatile end (602) and the third heating component (14).

9. The grid-type phase-change air-cooled converter according to claim 8, characterized in that: The third heating component (14) comprises a third heating element (1401) and a third heating element cover (1402); The third heating element cover (1402) is fixed in the heat dissipation cavity (15) via a support plate (19) in the cabinet (7); The third heating element (1401) is located inside the third heating element housing (1402); The inner circulation intermediate air duct (22) is connected to the third heating element housing (1402); a second inner circulation air outlet (33) for discharging hot air into the heat dissipation cavity (15) is provided at the bottom of the third heating element housing (1402).

10. The grid-type phase-change air-cooled converter according to claim 1, characterized in that: A main air outlet (17) for discharging hot air out of the cabinet body (7) is provided on one side of the cabinet bottom air outlet cavity (25).

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