Water-cooling inversion unit structure and frequency converter

Abstract

The utility model relates to a water-cooling inversion unit structure and a frequency converter, the water-cooling inversion unit structure comprises a shell, a first water-cooling plate and a second water-cooling plate are respectively arranged in the shell along the vertical direction, a first heat exchange device is arranged above the first water-cooling plate and the second water-cooling plate, and a second heat exchange device is arranged above the second water-cooling plate. A second heat exchange device is arranged below the first water cooling plate and the second water cooling plate, the first water cooling plate and the second water cooling plate are at least connected with one of the first heat exchange device and the second heat exchange device, and an air cooling device for supplying air into the shell is arranged in the shell and located below the second heat exchange device. According to the utility model, the technical problems of large volume and poor heat dissipation effect of the inversion unit are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, and particularly relates to a water-cooled inverter unit structure and a frequency converter. Background Art

[0002] The inverter unit is one of the widely used electrical component modules. It realizes inverter regulation by controlling the internal electrical component IGBT, so as to meet the inverter requirements of the power module. At the same time, it cooperates with the rectifier module and the power module to finally realize functions such as changing the operating frequency of the equipment motor, improving the operating efficiency, and saving energy. The inverter unit is the core component of the frequency converter in the application system, and the technology involved in the structure of the inverter unit is relatively extensive, including technologies in many aspects such as the installation, heat transfer, solid and fluid stress analysis, electromagnetic compatibility, and high-voltage insulation coordination of semiconductor devices. Therefore, only by ensuring the rationalization and miniaturization of the mechanical structure of the inverter unit can the safe operation and convenient maintenance of the inverter unit be guaranteed.

[0003] At present, the inverter unit is mostly cooled by air cooling or water cooling. Among them, the air-cooled power unit is an integral module. If a single part is damaged, the entire unit needs to be repaired and replaced as a whole, which not only has a high replacement cost, but also has a large volume and is easily restricted by space; while the waterway structure in the water-cooled power unit is relatively complex, with low heat dissipation efficiency and poor heat dissipation effect. From the above, it can be seen that the inverter unit in the existing frequency converter mainly has the problems of large volume and poor heat dissipation effect, which have seriously affected the service life of single components and the performance of the whole machine.

[0004] Therefore, the inventor, relying on years of experience and practice in the relevant industry, proposes a water-cooled inverter unit structure and a frequency converter to overcome the defects of the prior art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a water-cooled inverter unit structure and a frequency converter, which adopt a combination of air cooling and water cooling. Through the air-cooling device, the temperature of each functional module of the whole machine can be reduced, and the water-cooling device can also be cooled, improving the cooling effect, improving the heat dissipation efficiency, and effectively extending the service life of each functional component.

[0006] Another purpose of the utility model is to provide a water-cooled inverter unit structure and a frequency converter, which have a compact structure, reasonable layout, and are convenient to disassemble, effectively reducing the number of copper bars and the required space in the shell, saving the maintenance cost, improving the convenience of maintenance, and reducing the overall volume of the product.

[0007] The utility model can be realized by adopting the following technical solutions:

[0008] The present utility model provides a water-cooled inverter unit structure. The water-cooled inverter unit structure includes a housing. Inside the housing, a first water-cooled plate and a second water-cooled plate are respectively arranged vertically. Above the first water-cooled plate and the second water-cooled plate, a first heat exchange device is provided. Below the first water-cooled plate and the second water-cooled plate, a second heat exchange device is provided. The first water-cooled plate and the second water-cooled plate are connected to at least one of the first heat exchange device and the second heat exchange device. Inside the housing and below the second heat exchange device, an air-cooling device for supplying air into the housing is provided.

[0009] In a preferred embodiment of the present utility model, the second water-cooled plate is located on the front side of the first water-cooled plate. The two side plates of the first water-cooled plate respectively enclose with the second water-cooled plate and the inner wall of the housing to form a first chamber and a second chamber on both sides of the first water-cooled plate. The bottoms of the first chamber and the second chamber are respectively communicated with the air outlet of the air-cooling device.

[0010] Inside the first chamber and near the position of the first water-cooled plate, a plurality of capacitors are arranged. Inside the second chamber and near the position of the first water-cooled plate, a plurality of output reactors are arranged.

[0011] In a preferred embodiment of the present utility model, the plate surface of the first water-cooled plate extends along the front-back direction of the housing. The included angle between the plate surface of the second water-cooled plate and the plate surface of the first water-cooled plate is greater than 0° and less than or equal to 90°.

[0012] In a preferred embodiment of the present utility model, the water-cooled inverter unit structure further includes a first mounting plate for positioning the positions of the capacitors. And on the first water-cooled plate, a plurality of positioning holes are uniformly arranged along its plate surface. One end of each capacitor is connected to the first mounting plate, and the other end of each capacitor is inserted into the corresponding positioning hole.

[0013] In a preferred embodiment of the present utility model, a plurality of first heat-conducting sheets are arranged between the first mounting plate and the first water-cooled plate, and / or a plurality of second heat-conducting sheets with insulating properties are arranged between each capacitor and the first water-cooled plate.

[0014] In a preferred embodiment of the present utility model, a plurality of support columns are arranged on the plate surface of the first water-cooled plate near the side of the first mounting plate. One end of each support column is respectively connected to the plate surface of the first water-cooled plate, and the other end of each support column is respectively connected to the first mounting plate.

[0015] In a preferred embodiment of the present utility model, the water-cooled inverter unit structure further includes a stacked busbar disposed in the first chamber, and the stacked busbar is located between the first mounting plate and the inner wall of the housing.

[0016] In a preferred embodiment of the present utility model, on the side plate of the second water-cooled plate away from the first water-cooled plate, it encloses a third chamber with the inner wall of the housing, and the bottom of the third chamber is communicated with the air outlet of the air-cooling device;

[0017] In the third chamber and near the second water-cooled plate, a plurality of IGBTs and circuit boards are provided, and the IGBTs and the circuit boards are stacked and arranged in the third chamber.

[0018] In a preferred embodiment of the present utility model, a plurality of drive boards are further provided in the third chamber, each IGBT is connected to a corresponding drive board, and each drive board is connected to the stacked busbar.

[0019] In a preferred embodiment of the present utility model, a plurality of absorption capacitors are further provided in the third chamber, and each absorption capacitor is respectively connected between the corresponding drive board and the stacked busbar.

[0020] In a preferred embodiment of the present utility model, an electrical safety distance is maintained between the pins of the IGBT and the pins of the absorption capacitor, and an isolation seat is provided between the pins of the IGBT and the pins of the absorption capacitor.

[0021] In a preferred embodiment of the present utility model, the water-cooled inverter unit structure further includes a second mounting plate located in the third chamber, the second mounting plate is vertically disposed on the front side of each IGBT, and the circuit board is disposed on the second mounting plate.

[0022] In a preferred embodiment of the present utility model, the air-cooling device includes an air-cooling fixing member and a fan, the air-cooling fixing member is a rectangular box-shaped structure with an open top, the fan is disposed in the air-cooling fixing member, and the air-cooling fixing member is slidably disposed at the bottom of the housing.

[0023] In a preferred embodiment of the present utility model, slide rails are respectively disposed below the housing and on the left and right sides of the housing, the slide rails extend along the front and rear directions of the housing, long strip-shaped sliders are respectively disposed on two opposite edges of the opening of the air-cooling fixing member, and the two sliders are respectively slidably connected to the corresponding slide rails, and the opening of the air-cooling fixing member is the air outlet of the air-cooling device.

[0024] In a preferred embodiment of the present utility model, a ramp-shaped entrance is formed between the end of the slide rail and the bottom of the housing.

[0025] In a preferred embodiment of the present utility model, a plurality of support beams are provided at the bottom of the housing and below the slide rail.

[0026] In a preferred embodiment of the present utility model, a plurality of output rows are provided at the bottom of the housing, and each output row is respectively connected to a corresponding output reactor.

[0027] In a preferred embodiment of the present utility model, wiring grooves are formed in the output rows.

[0028] In a preferred embodiment of the present utility model, the housing includes a rectangular parallelepiped-shaped frame arranged vertically, and the length of the housing in the front-back direction is greater than the width of the housing in the left-right direction;

[0029] The housing further includes a front panel, a first side panel, a second side panel and a back panel. The front panel is arranged at the front of the frame, the first side panel and the second side panel are respectively arranged on the left and right sides of the frame, the back panel is arranged at the rear of the frame, and the front panel, the first side panel, the second side panel and the back panel are connected to enclose a storage space inside the housing.

[0030] In a preferred embodiment of the present utility model, the front panel is formed by splicing a plurality of plates, and each plate is respectively connected to the frame.

[0031] In a preferred embodiment of the present utility model, a plurality of wire passing holes are provided on the frame.

[0032] In a preferred embodiment of the present utility model, a hoisting hole is provided at the top of the housing.

[0033] The present utility model provides a frequency converter, which includes a cabinet body and the above-mentioned water-cooled inverter unit structure, and the water-cooled inverter unit structure is arranged inside the cabinet body.

[0034] As described above, the characteristics and advantages of the water-cooled inverter unit structure and the frequency converter of the present utility model are as follows: The structure of the present utility model is compact. The cooling part and the functional device part in the shell are reasonably arranged and convenient to disassemble, improving the convenience of maintenance, saving maintenance costs, and reducing the overall volume of the product. In addition, the cooling part in the shell combines an air-cooling device and a water-cooling device. The structures of the air-cooling device and the water-cooling device are compact, reasonably arranged, and complementary to each other. Through the air-cooling device, the functional device part can be cooled, and the water-cooling device can also be cooled, improving the cooling effect, enhancing the heat dissipation efficiency, effectively prolonging the service life of each functional component, and ensuring the long-term stable working state of the inverter unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The following drawings are only intended to illustrate and explain the present utility model schematically and do not limit the scope of the present utility model. Among them:

[0036] Figure 1 : is an exploded view of the water-cooled inverter unit structure of the present utility model.

[0037] Figure 2 : is a schematic structural diagram of the water-cooled inverter unit structure of the present utility model in the state where the second side plate is opened.

[0038] Figure 3 : is a schematic structural diagram of the water-cooled inverter unit structure of the present utility model in the state where the first side plate is opened.

[0039] Figure 4 : is a schematic structural diagram of the interior of the cavity of the water-cooled inverter unit structure of the present utility model.

[0040] Figure 5 : is a schematic structural diagram of the heat dissipation component of the water-cooled inverter unit structure of the present utility model.

[0041] Figure 6 : is a front view of the water-cooled inverter unit structure of the present utility model.

[0042] Figure 7 : is a front view of the water-cooled inverter unit structure of the present utility model in the state where the front panel is opened.

[0043] Figure 8 : is a front view of the water-cooled inverter unit structure of the present utility model in the state where the second mounting plate is removed.

[0044] The reference numerals in the present utility model are:

[0045] 1. Shell; 2. Air-cooling device;

[0046] 3. First heat exchange device; 4. Second heat exchange device;

[0047] 5. First water-cooling plate; 6. Second water-cooling plate;

[0048] 7. Capacitor; 8. IGBT;

[0049] 9. First mounting plate; 10. Support column;

[0050] 11. First side plate; 12. Front panel;

[0051] 13. Second side plate; 14. Air-cooling fixing part;

[0052] 1401. Slide block; 15. Slide rail;

[0053] 16. Air-cooling panel; 17. Mounting terminal;

[0054] 18. Interface terminal; 19. Circuit board;

[0055] 20. Second mounting plate; 21. Driver board;

[0056] 22. Hoisting hole; 23. Support beam;

[0057] 24. Wire passing hole; 25. Output reactor;

[0058] 26. Second chamber; 27. Absorption capacitor;

[0059] 28. Isolation seat; 29. Output row;

[0060] 2901. Wiring groove; 30. Stacked busbar;

[0061] 31. Back panel; 32. First chamber;

[0062] 33. Positioning hole; 34. Third chamber. Detailed implementation manners

[0063] For a clearer understanding of the technical features, objectives, and effects of the present utility model, the detailed implementation manners of the present utility model will now be described with reference to the accompanying drawings.

[0064] The directional terms such as up, down, front, back, left, right, top, and bottom mentioned in the present utility model shall be based on the up, down, front, back, left, right, top, and bottom directions in the Figure 6 accompanying drawings, and are hereby explained together.

[0065] Embodiment 1

[0066] As Figures 1 to 8As shown in the figure, the present utility model provides a water-cooled inverter unit structure. The water-cooled inverter unit structure includes a housing 1. Inside the housing 1, a first water-cooled plate 5 and a second water-cooled plate 6 are respectively arranged vertically. Above the first water-cooled plate 5 and the second water-cooled plate 6, a first heat exchange device 3 is provided (that is, the first heat exchange device 3 is located above both the first water-cooled plate 5 and the second water-cooled plate 6). Below the first water-cooled plate 5 and the second water-cooled plate 6, a second heat exchange device 4 is provided (that is, the second heat exchange device 4 is located below both the first water-cooled plate 5 and the second water-cooled plate 6). The first water-cooled plate 5 and the second water-cooled plate 6 are connected to at least one of the first heat exchange device 3 and the second heat exchange device 4. Inside the housing 1 and below the second heat exchange device 4, an air-cooling device 2 for supplying air into the housing 1 is provided. In the present utility model, the cooling part inside the housing 1 is combined by the air-cooling device 2 and the water-cooling device (that is, the first water-cooled plate 5, the second water-cooled plate 6, the first heat exchange device 3 and the second heat exchange device 4). The structure between the air-cooling device 2 and the water-cooling device is compact, the layout is reasonable, and they complement each other. Through the air-cooling device 2, not only can the functional device part arranged inside the housing 1 be cooled, but also the water-cooling device can be cooled, improving the cooling effect, improving the heat dissipation efficiency, effectively prolonging the service life of each functional component, and further enhancing the use performance of the product, ensuring the long-term stable working state of the product.

[0067] Among them, the connection methods between the first water-cooled plate 5, the second water-cooled plate 6, the first heat exchange device 3 and the second heat exchange device 4 can be various. The first water-cooled plate 5 and the second water-cooled plate 6 can be respectively connected to the first heat exchange device 3 or the second heat exchange device 4, and the first water-cooled plate 5 and the second water-cooled plate 6 are heat-exchanged only through the first heat exchange device 3 or only through the second heat exchange device 4; it is also possible that the first water-cooled plate 5 is connected to the first heat exchange device 3, and the second water-cooled plate 6 is connected to the second heat exchange device 4 (or the second water-cooled plate 6 is connected to the first heat exchange device 3, and the first water-cooled plate 5 is connected to the second heat exchange device 4), and the first heat exchange device 3 and the second heat exchange device 4 respectively conduct heat exchange on the corresponding first water-cooled plate 5 and second water-cooled plate 6; of course, it is also possible to connect the first water-cooled plate 5, the second water-cooled plate 6, the first heat exchange device 3 and the second heat exchange device 4 in series in sequence, and the first heat exchange device 3 and the second heat exchange device 4 conduct heat exchange on the first water-cooled plate 5 and the second water-cooled plate 6 simultaneously.

[0068] Furthermore, the first heat exchange device 3 and the second heat exchange device 4 can be, but are not limited to, plate heat exchangers.

[0069] In an alternative embodiment of the present utility model, such as Figure 1 、 Figure 2 、 Figure 4 、 Figure 5As shown in the figure, the second water-cooling plate 6 is located on the front side of the first water-cooling plate 5. One side plate surface of the first water-cooling plate 5, the second water-cooling plate 6 and the inner wall of the housing 1 enclose a first chamber 32 on one side of the first water-cooling plate 5. The other opposite side plate surface of the first water-cooling plate 5, the second water-cooling plate 6 and the inner wall of the housing 1 enclose a second chamber 26 on the other side of the first water-cooling plate 5. The bottoms of the first chamber 32 and the second chamber 26 are respectively communicated with the air outlet of the air-cooling device 2. A plurality of capacitors 7 are arranged in the first chamber 32 and close to the first water-cooling plate 5, and each capacitor 7 is tightly attached to the plate surface of the first water-cooling plate 5. A plurality of output reactors 25 are arranged in the second chamber 26 and close to the first water-cooling plate 5, and each output reactor 25 is tightly attached to the plate surface of the first water-cooling plate 5. An independent first chamber 32 and second chamber 26 are formed in the housing 1, and the heat generated by each capacitor 7 and each output reactor 25 is respectively retained in the first chamber 32 and the second chamber 26, so as to dissipate the heat generated by the functional components separately, prevent the heat generated by different functional components from affecting other functional components, and avoid affecting the working state of the functional components.

[0070] Specifically, as Figure 2 , Figure 4 shown, the output reactors 25 are arranged in sequence in the vertical direction in the second chamber 26.

[0071] Furthermore, as Figure 1 , Figure 5 shown, the plate surface of the first water-cooling plate 5 extends along the front-back direction of the housing 1. The included angle between the plate surface of the second water-cooling plate 6 and the plate surface of the first water-cooling plate 5 is greater than 0° and less than or equal to 90°, and the width of the plate surface of the second water-cooling plate 6 is less than the width of the plate surface of the first water-cooling plate 5, so as to effectively reduce the width of the housing 1 (in the left-right direction), and further reduce the volume of the whole machine, and the installation of the inverter unit can be completed without a large space.

[0072] In an alternative embodiment of the present utility model, as Figure 1 shown, the water-cooled inverter unit structure further includes a first mounting plate 9 for positioning the positions of the capacitors 7. The first mounting plate 9 is located in the first chamber 32, and the plate surface of the first mounting plate 9 is parallel to the plate surface of the first water-cooling plate 5. A plurality of positioning holes 33 are uniformly arranged on the first water-cooling plate 5 along its plate surface. One end of each capacitor 7 is fixedly installed on the first mounting plate 9 through screws, and the other end of each capacitor 7 is inserted into the corresponding positioning hole 33. The capacitors 7 are fixed by the cooperation of the first mounting plate 9 and the positioning holes 33 on the second water-cooling plate 6, ensuring the stability of the installation of each capacitor 7 in the housing 1.

[0073] Further, a plurality of first heat conducting sheets may be provided between the first mounting plate 9 and the first water cooling plate 5 to improve the heat conduction efficiency, thereby improving the heat dissipation efficiency of each capacitor 7. Additionally, a plurality of second heat conducting sheets with insulating properties may be provided between each capacitor 7 and the first water cooling plate 5 to improve the heat conduction efficiency, thereby improving the heat dissipation efficiency of each capacitor 7.

[0074] Further, as Figure 1 shown, when the number of capacitors 7 is relatively large, a plurality of support columns 10 are provided on the surface of the first water cooling plate 5 close to the first mounting plate 9. One end of each support column 10 is fixedly connected to the surface of the first water cooling plate 5, and the other end of each support column 10 is fixedly connected to the first mounting plate 9. The arrangement of each support column 10 can effectively prevent the deformation of the first mounting plate 9, which may cause the capacitors 7 provided thereon to not be closely attached to the surface of the first water cooling plate 5.

[0075] Further, as Figure 1 、 Figure 3 shown, the water-cooled inverter unit structure further includes a stacked busbar 30 disposed in the first chamber 32. The stacked busbar 30 is located between the first mounting plate 9 and the inner wall of the housing 1.

[0076] In an alternative embodiment of the present utility model, as Figure 1 、 Figure 3 、 Figure 7 、 Figure 8 shown, on the side surface of the second water cooling plate 6 away from the first water cooling plate 5, it encloses with the inner wall of the housing 1 to form a third chamber 34. The bottom of the third chamber 34 is connected to the air outlet of the air cooling device 2; a plurality of IGBTs (Insulated Gate Bipolar Transistors) 8 and circuit boards 19 are provided in the third chamber 34. Each IGBT 8 is directly disposed on the surface of the second water cooling plate 6, the circuit board 19 is disposed at a position close to the second water cooling plate 6, and the IGBTs 8 and the circuit boards 19 are stacked and arranged in the third chamber 34. The IGBTs 8 and the circuit boards 19 are located in the third chamber 34, and heat dissipation is performed on the IGBTs 8 and the circuit boards 19 through the second water cooling plate 6 and the air cooling device 2, avoiding the influence of the heat generated by other functional components (such as: capacitors 7 and output reactors 25) on the IGBTs 8 and the circuit boards 19, and ensuring the stable working state of the IGBTs 8 and the circuit boards 19.

[0077] Further, as Figure 1 shown, a plurality of drive boards 21 are further provided in the third chamber 34. Each drive board 21 is stacked with each IGBT 8, each IGBT 8 is connected to the corresponding drive board 21, and each drive board 21 is connected to the stacked busbar 30. The drive circuit on the drive board 21 is used to amplify the pulse signal, thereby driving each IGBT 8.

[0078] Further, asFigure 1 , Figure 2 , Figure 8 As shown in Figure 8 , a plurality of snubber capacitors 27 are further disposed in the third chamber 34. Each snubber capacitor 27 is stacked with each drive board 21 and each IGBT 8, and each snubber capacitor 27 is respectively connected between the corresponding drive board 21 and the laminated bus bar 30.

[0079] Specifically, each of the IGBTs 8, each of the drive boards 21, and each of the snubber capacitors 27 are sequentially arranged vertically in the third chamber 34.

[0080] In an alternative embodiment of the present invention, as Figure 8 shown, an electrical safety distance is maintained between the pins of the IGBT 8 and the pins of the snubber capacitor 27, and an insulating isolation seat 28 is provided between the pins of the IGBT 8 and the pins of the snubber capacitor 27. This prevents the situation where the snubber capacitor 27 leaks electricity and burns out the IGBT 8, ensuring the stable operating state of the IGBT 8.

[0081] Furthermore, as Figure 1 , Figure 4 , Figure 7 shown, the water-cooled inverter unit structure further includes a second mounting plate 20 located in the third chamber 34. The second mounting plate 20 is vertically disposed on the front side of each IGBT 8. The second mounting plate 20 is parallel to the second water-cooling plate 6, and the circuit board 19 is disposed on the second mounting plate 20. Additionally, the second mounting plate 20 can be formed by splicing multiple plates. Circuits for controlling different functional components are provided on each plate. Adjacent plates are separated by partitions, and through holes for wires to pass through are reserved on the partitions to facilitate wiring.

[0082] Specifically, the second mounting plate 20 is fixed to the housing 1 by screws, and tie straps are bundled between the second mounting plate 20 and the housing 1 for reinforcement. When it is necessary to replace and / or maintain the IGBT 8 and / or the drive board 21 in the third chamber 34, the screws can be unscrewed, the connectors on the circuit board 19 can be pulled out, and after cutting the tie straps, the IGBT 8 and the drive board 21 on the front side of the second water-cooling plate 6 can be replaced and / or maintained as a whole.

[0083] In an alternative embodiment of the present invention, as Figure 1 shown, the air-cooling device 2 includes an air-cooling fixing member 14 and a fan. The air-cooling fixing member 14 is a rectangular box-shaped structure with an open top. The fan is disposed inside the air-cooling fixing member 14, and the air-cooling fixing member 14 is slidably disposed at the bottom of the housing 1. By blowing air from the bottom of the housing 1 into its interior, the functions of cooling and heat dissipation are achieved.

[0084] Furthermore, as Figure 1 ,Figure 3 , Figure 4 , Figures 6 to 8 As shown in Figures 6 to 8 , an air-cooled panel 16 is provided at the front of the air-cooled fixing member 14. Mounting terminals 17 are provided on the air-cooled panel 16, and the mounting terminals 17 are connected to the fan. An external power supply can be connected through the mounting terminals 17 to control the working state of the fan; expansion interfaces can also be provided on the mounting terminals 17 to achieve the purpose of function expansion.

[0085] Furthermore, a handle (not shown) or a wire outlet hole can be provided at the middle position of the air-cooled panel 16 to facilitate the wire outlet of the fan.

[0086] Specifically, as shown in Figure 1 and Figure 2 , slide rails 15 are respectively provided below the housing 1 and on the left and right sides of the housing 1. The slide rails 15 extend along the front-back direction of the housing 1. Long strip-shaped sliders 1401 are respectively provided on two opposite edges at the opening of the air-cooled fixing member 14, and the two sliders 1401 are respectively slidably connected to the corresponding slide rails 15. The opening of the air-cooled fixing member 14 is the air outlet of the air-cooling device 2. The setting of the air-cooled fixing member 14 facilitates the disassembly, assembly and maintenance of the fan.

[0087] Furthermore, as shown in Figure 1 , a ramp-shaped inlet is formed between the end of the slide rail 15 and the bottom of the housing 1 (the end of the slide rail 15 is bent away from the bottom of the housing 1 through sheet metal to form a certain inclination angle), which facilitates the insertion of the air-cooled fixing member 14 into the slide rail 15.

[0088] Furthermore, as shown in Figure 1 , a plurality of support beams 23 are provided below the bottom of the housing 1 and below the slide rails 15. Each support beam 23 is parallel to the horizontal plane, and each support beam 23 is respectively connected to the bottom of the housing 1. When installing the inverter unit, each support beam 23 can provide a certain supporting force for the housing 1 to ensure the stable installation of the inverter unit.

[0089] In an alternative embodiment of the present utility model, as shown in Figure 1 and Figure 2 , a plurality of output rows 29 are provided at the bottom of the housing 1. Each output row 29 is respectively connected to the corresponding output reactor 25. Wiring grooves 2901 are formed on the output rows 29 to facilitate wiring.

[0090] Furthermore, the wiring groove 2901 can be, but is not limited to, a "U"-shaped opening groove formed in the lower part of the output row 29 along the vertical or horizontal direction.

[0091] In an alternative embodiment of the present utility model, as shown in Figures 1 to 4 and Figure 6 ,​​​​​​​​​​​​​​​As shown, the housing 1 includes a cuboid-shaped frame arranged vertically. The length of the housing 1 in the front-rear direction is greater than the width of the housing 1 in the left-right direction. The housing 1 further includes a front panel 12, a first side panel 11, a second side panel 13, and a back panel 31. The front panel 12 is arranged at the front of the frame, the first side panel 11 is arranged on the left side of the frame, the second side panel 13 is arranged on the right side of the frame, and the back panel 31 is arranged at the rear of the frame. The front panel 12, the first side panel 11, the second side panel 13, and the back panel 31 are detachably connected by screws to enclose a storage space inside the housing 1.

[0092] Further, the surfaces of the first side panel 11 and the second side panel 13 are respectively subjected to insulation treatment (covering an insulating layer) to ensure the electrical safety distance between the capacitor 7 and the output reactor 25 and the inner wall of the housing 1.

[0093] Further, the front panel 12 can be an integral structure; of course, as Figure 1 、 Figure 6 shown, the front panel 12 can also be formed by splicing multiple plates. Each plate is respectively connected to the frame, which is convenient for disassembly and the maintenance and replacement of the internal functional components. Among them, a hem is formed at the edge position of the front panel 12 and folded towards the direction close to the third chamber 34 to improve the strength of the front panel 12.

[0094] Specifically, the front panel 12 is divided into upper and lower parts. The power circuit part is on the circuit board 19 arranged in the third chamber 34 corresponding to the upper part of the front panel 12, and the control circuit part is on the circuit board 19 arranged in the third chamber 34 corresponding to the lower part of the front panel 12. During operation, it can be separately disassembled and subjected to targeted maintenance and replacement.

[0095] Further, as Figure 1 、 Figure 6 shown, interface terminals 18 are arranged on the front panel 12. Of course, other interface terminals, silk screen labels, or adhesive labels can also be added on the front panel 12.

[0096] Further, as Figures 2 to 4 shown, a plurality of wire passing holes 24 are arranged on the frame to facilitate wire routing.

[0097] Further, as Figures 2 to 4 shown, lifting holes 22 are respectively arranged at the top of the housing 1 and on the left and right sides of the housing 1. The inverter unit can be lifted through the lifting holes 22 and then placed into the cabinet of the frequency converter.

[0098] Further, holes are respectively opened on both sides of the housing 1 to serve as handle positions, so as to avoid separately setting handles and handle fixing parts, saving materials and processing costs.

[0099] The characteristics and advantages of the water-cooled inverter unit structure of the present utility model are as follows:

[0100] First, this water-cooled inverter unit structure combines the air-cooling device 2 and the water-cooling device. Through the air-cooling device 2, it can not only cool the functional device part arranged in the housing 1, but also cool the water-cooling device, improve the cooling effect, enhance the heat dissipation efficiency, effectively extend the service life of each functional component, and further improve the performance of the product to ensure the long-term stable working state of the product.

[0101] Second, this water-cooled inverter unit structure is compact. The cooling part and the functional device part in the housing are reasonably arranged and convenient to disassemble, which improves the convenience of maintenance, saves the maintenance cost, and reduces the overall volume of the product.

[0102] Third, by disassembling the front panel 12 of this water-cooled inverter unit structure, the replacement and maintenance of the corresponding internal functional components can be completed, avoiding the problem that the whole machine cannot be disassembled and maintained in a narrow space, saving the maintenance cost and increasing the convenience of maintenance.

[0103] Embodiment 2

[0104] The present utility model provides a frequency converter, which includes a cabinet (not shown) and the above-mentioned water-cooled inverter unit structure, and the water-cooled inverter unit structure is arranged in the cabinet.

[0105] The above are only the schematic specific embodiments of the present utility model and are not intended to limit the scope of the present utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present utility model shall fall within the scope of protection of the present utility model.

Claims

1. A water-cooled inverter unit structure, characterized in that: The water-cooled inverter unit structure includes a shell, and a first water-cooling plate and a second water-cooling plate are respectively arranged vertically inside the shell, a first heat exchange device is arranged above the first water-cooling plate and the second water-cooling plate, and a second heat exchange device is arranged below the first water-cooling plate and the second water-cooling plate. The first water-cooling plate and the second water-cooling plate are connected to at least one of the first heat exchange device and the second heat exchange device, and an air cooling device for supplying air into the shell is arranged inside the shell and below the second heat exchange device.

2. The water-cooled inverter unit structure according to claim 1, characterized in that: The second water-cooling plate is located in front of the first water-cooling plate, and the two side surfaces of the first water-cooling plate are respectively surrounded by the second water-cooling plate and the inner wall of the shell to form a first chamber and a second chamber located on both sides of the first water-cooling plate, and the bottom of the first chamber and the bottom of the second chamber are respectively connected to the air outlet of the air cooling device; A plurality of capacitors are disposed in the first chamber and close to the first water-cooling plate, and a plurality of output reactors are disposed in the second chamber and close to the first water-cooling plate.

3. The water-cooled inverter unit structure according to claim 2, characterized in that: The plate surface of the first water-cooling plate extends along the front and rear sides of the shell, and the angle between the plate surface of the second water-cooling plate and the plate surface of the first water-cooling plate is greater than 0° and less than or equal to 90°.

4. The water-cooled inverter unit structure according to claim 2, characterized in that: The water-cooled inverter unit structure also includes a first mounting plate for positioning each of the capacitors, and a plurality of positioning holes are evenly distributed along the surface of the first water-cooled plate, one end of each of the capacitors is connected to the first mounting plate, and the other end of each of the capacitors is inserted into the corresponding positioning hole.

5. The water-cooled inverter unit structure according to claim 4, characterized in that: A plurality of first heat conducting plates are arranged between the first mounting plate and the first water cooling plate, and / or a plurality of second heat conducting plates with insulating properties are arranged between each of the capacitors and the first water cooling plate.

6. The water-cooled inverter unit structure according to claim 4, characterized in that: A plurality of support columns are arranged on the plate surface of the first water-cooling plate close to the first mounting plate, one end of each support column is respectively connected to the plate surface of the first water-cooling plate, and the other end of each support column is respectively connected to the first mounting plate.

7. The water-cooled inverter unit structure according to claim 4, characterized in that: The water-cooled inverter unit structure also includes a laminated busbar disposed in the first chamber, and the laminated busbar is located between the first mounting plate and the inner wall of the shell.

8. The water-cooled inverter unit structure according to claim 2, characterized in that: A side surface of the second water-cooling plate away from the first water-cooling plate and an inner wall of the shell together form a third chamber, and the bottom of the third chamber is connected to the air outlet of the air cooling device; A plurality of IGBTs and circuit boards are disposed in the third chamber and close to the second water-cooling plate. The IGBTs and the circuit boards are stacked and arranged in the third chamber.

9. The water-cooled inverter unit structure according to claim 8, characterized in that: A plurality of drive boards are also arranged in the third chamber, each of the IGBTs is connected to the corresponding drive board, and each of the drive boards is connected to the laminated busbar.

10. The water-cooled inverter unit structure according to claim 9, characterized in that: A plurality of absorption capacitors are also arranged in the third chamber, and each of the absorption capacitors is respectively connected between the corresponding driving board and the laminated busbar.

11. The water-cooled inverter unit structure according to claim 10, characterized in that: An electrical safety distance is maintained between the pins of the IGBT and the pins of the absorption capacitor, and an isolation seat is provided between the pins of the IGBT and the pins of the absorption capacitor.

12. The water-cooled inverter unit structure according to claim 8, characterized in that: The water-cooled inverter unit structure also includes a second mounting plate located in the third chamber, the second mounting plate is vertically arranged on the front side of each of the IGBTs, and the circuit board is arranged on the second mounting plate.

13. The water-cooled inverter unit structure according to claim 2, characterized in that: The air cooling device comprises an air cooling fixture and a fan. The air cooling fixture is a rectangular box-shaped structure with an open top. The fan is arranged in the air cooling fixture. The air cooling fixture can be pushed and pulled at the bottom of the shell.

14. The water-cooled inverter unit structure according to claim 13, characterized in that: Slide rails are respectively arranged below the shell and on the left and right sides of the shell, and the slide rails extend along the front-to-back direction of the shell. Long strip-shaped sliders are respectively arranged on the two opposite edges of the opening of the air-cooling fixing member, and the two sliders are respectively slidably connected to the corresponding slide rails. The opening of the air-cooling fixing member is the air outlet of the air cooling device.

15. The water-cooled inverter unit structure according to claim 14, characterized in that: A sloped entrance is formed between the end of the slide rail and the bottom of the shell.

16. The water-cooled inverter unit structure according to claim 14, characterized in that: A plurality of support beams are arranged at the bottom of the shell and below the slide rail.

17. The water-cooled inverter unit structure according to claim 2, characterized in that: A plurality of output rows are arranged at the bottom of the shell, and each of the output rows is connected to a corresponding output reactor.

18. The water-cooled inverter unit structure according to claim 17, characterized in that: The output row is provided with a wiring slot.

19. The water-cooled inverter unit structure according to claim 1, characterized in that: The housing comprises a rectangular parallelepiped frame arranged vertically, and the length of the housing in the front-to-back direction is greater than the width of the housing in the left-to-right direction; The shell also includes a front panel, a first side panel, a second side panel and a back panel, the front panel is arranged at the front of the frame, the first side panel and the second side panel are arranged at the left and right sides of the frame respectively, and the back panel is arranged at the rear of the frame, and the front panel, the first side panel, the second side panel and the back panel are connected to enclose a containing space inside the shell.

20. The water-cooled inverter unit structure according to claim 19, characterized in that: The front panel is formed by splicing a plurality of panels, and each of the panels is connected to the frame respectively.

21. The water-cooled inverter unit structure according to claim 19, characterized in that: The frame is provided with a plurality of wire passing holes.

22. The water-cooled inverter unit structure according to claim 1, characterized in that: A hoisting hole is arranged on the top of the shell.

23. A frequency converter, characterized in that: The frequency converter comprises a cabinet and a water-cooled inverter unit structure according to any one of claims 1 to 22, wherein the water-cooled inverter unit structure is arranged in the cabinet.

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