Pre-maintenance narrow type water-cooling inversion unit structure and frequency converter

Abstract

The invention relates to the technical field of frequency converters, and discloses a front-maintenance narrow water-cooling inverter unit structure and a frequency converter, the inverter unit structure comprises a main shell, a heat dissipation cooling assembly and a complete machine assembly; the heat dissipation cooling assembly comprises a side water cooling plate, a front water cooling plate, a top heat exchanger, a bottom heat exchanger and a fan; the whole machine assembly comprises a capacitor, an output reactor, an IGBT assembly, an absorption capacitor and a PCB assembly, the capacitor and the output reactor are respectively distributed on two side plate surfaces of the side water cooling plate, and all the IGBT assembly, the absorption capacitor and the PCB assembly are all installed on the front side plate surface of the front water cooling plate. According to the invention, the configuration is richer, the structure is more compact, and all the IGBT assemblies, the absorption capacitors and the PCB assemblies are all assembled on the front water cooling plate in the front and can be directly maintained in the front; meanwhile, air cooling and water cooling are combined, and a heat exchanger type structure is additionally arranged, so that the temperature rise in the mounting cavity and the mounting cabinet body can be better improved, and the service life of each part is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of frequency converters, and more particularly to a front-maintained narrow water-cooled inverter unit structure and a frequency converter. Background Art

[0002] The inverter module is the core component of the frequency converter system. It works with the rectifier module to achieve functions such as motor frequency conversion, improved operating efficiency, and energy saving.

[0003] Existing power equipment inverter unit products mainly include input busbars, capacitors, laminated busbars, IGBTs, Halls, output busbars, etc. These are installed in the box and dissipated by fans. However, due to the influence of the box volume, some components need to be installed separately in the cabinet of the installation box, resulting in high cost, large size, heavy weight, occupied cabinet space, and difficulty in installation / disassembly.

[0004] At the same time, traditional inverters use water cooling mainly to dissipate heat for IGBT high-power devices, but cannot take into account the overall temperature rise in the cabinet. If no auxiliary heat dissipation measures are added, such as capacitors, the heat generated by components in the cabinet cannot be effectively dissipated, resulting in poor heat dissipation, which seriously affects the service life of electronic components and thus affects the performance of the entire machine.

[0005] In addition, traditional inverters still have the following problems:

[0006] (1) Traditional inverters use air cooling or water cooling to dissipate heat, and the heat dissipation method is single;

[0007] (2) The PCB boards in traditional narrow inverters / book-type inverters cannot be installed in the front due to device layout or space constraints, and cannot be fully maintained from the front.

[0008] (3) The IGBT modules of the traditional narrow inverter / book-type inverter structure are generally arranged on the side, and cannot be disassembled and replaced without removing the entire module.

[0009] Therefore, it is necessary to improve the inverter structure in the frequency converter to overcome the above technical problems. Summary of the invention

[0010] In view of this, the present invention proposes a front-maintained narrow water-cooled inverter unit structure and a frequency converter, and its specific technical solution is as follows:

[0011] The present invention discloses a front-maintained narrow water-cooled inverter unit structure, comprising a main shell, a heat dissipation and cooling component, and a complete machine component; an installation cavity is formed inside the main shell, and the upper and lower ends of the main shell are respectively provided with ventilation holes connected to the installation cavity; the heat dissipation and cooling component comprises a side water-cooling plate, a front water-cooling plate, a top heat exchanger, a bottom heat exchanger, and a fan; the side water-cooling plate and the front water-cooling plate are both fixed in the installation cavity, the front water-cooling plate is located in front of the side water-cooling plate, and is perpendicular to the extension surface of the side water-cooling plate; the top heat exchanger is correspondingly installed outside the upper end ventilation hole of the main shell, and the The bottom heat exchanger is installed in the lower end vent correspondingly, and the fan is installed outside the lower end vent of the main shell correspondingly; the cooling water input port 1 is connected to the water inlet of the bottom heat exchanger, and the bottom heat exchanger, the front water-cooling plate, and the side water-cooling plate are connected in series in sequence through a heat dissipation pipeline, and the front water-cooling plate outlet and the side water-cooling plate outlet arranged on the upper side of the corresponding water-cooling plate are connected to the cooling water output port 1 as a whole through the heat dissipation pipeline; the cooling water input port 2 is connected to the water inlet of the top heat exchanger through a heat dissipation pipeline, and the top heat exchanger outlet is connected to the cooling water output port 2 through a heat dissipation pipeline; the whole machine assembly arranged in the installation cavity includes capacitors, output inductors, IGBT assemblies, absorption capacitors and PCB assemblies, and the capacitors and the output inductors are respectively distributed on the two side panels of the side water-cooling plate, and all the IGBT assemblies, the absorption capacitors and the PCB assemblies are all installed on the front side panel of the front water-cooling plate.

[0012] Preferably, the capacitor is mounted on the corresponding side of the side water-cooling plate by means of a capacitor mounting plate, and the tail of the capacitor contacts the side water-cooling plate, and a laminated busbar is installed between the capacitor and the corresponding side plate.

[0013] Preferably, a heat conducting sheet is connected between the tail of the capacitor and the side water cooling plate; and / or, a capacitor support member for supporting the capacitor mounting plate is installed on the corresponding surface of the side water cooling plate.

[0014] Preferably, the fan is installed in a fan fixing with folded edges on both sides, and a shielding panel is installed on the front side of the fan fixing, and a fan external adapter terminal is provided on the shielding panel; fan slide rails extending in the front-to-back direction are installed on the left and right sides of the lower end surface of the main shell near the edge, and support beams below the main shell are also installed vertically downward on both sides of the lower end of the main shell; the fan fixing is adapted to be slidably connected to the fan slide rails.

[0015] Preferably, each of the IGBT components includes an IGBT main device, an IGBT driving board and an IGBT output row, and the IGBT main device is tightly mounted on the front water cooling plate; an IGBT isolation seat is installed in the middle of the pins of each IGBT main device and in the middle of the pins of the absorption capacitor corresponding to its front side.

[0016] Preferably, the PCB assembly includes a power component installed on the upper side of the front water-cooling plate through a PCB mounting plate and a control component installed on the lower side of the front water-cooling plate through a PCB mounting plate; the PCB mounting plate is a separate structure, including an upper mounting plate corresponding to the power component and a lower mounting plate corresponding to the control component, both the upper mounting plate and the lower mounting plate can be removably installed on the front water-cooling plate, and the power component and the control component are layered on the front side of the IGBT component with the help of their respective corresponding mounting plates.

[0017] Preferably, a panel is detachably installed on the front side of the main shell, and the panel is an integrated structure or a split structure. The panel of the split structure is divided into an upper panel and a lower panel, the rear of the upper panel corresponds to the power component, and the rear of the lower panel corresponds to the control component.

[0018] Preferably, the left and right sides of the main shell correspond to detachably mounted left and right plates, and the left and right plates are insulated respectively, and the left and right plates are provided with corresponding coils for passing through each external control wire; and / or, a lifting hole is provided on the upper portion of the main shell.

[0019] Preferably, an output row for three-phase AC extends downward from the bottom outer side of the main shell, the Hall element installed in the installation cavity is connected to the output row, and a horizontal U-shaped groove or a longitudinal U-shaped groove is opened at the lower end of the outer side of the output row.

[0020] The present invention also discloses a frequency converter, including the front-maintained narrow water-cooled inverter unit structure described in any one of the above.

[0021] Compared with the prior art, the front-maintained narrow water-cooled inverter unit structure and the inverter of the present invention have the following advantages:

[0022] (1) All IGBT components, absorption capacitors and PCB components in the present invention are assembled on the front water cooling plate, and can be maintained directly at the front without removing the entire inverter unit structure from the inverter cabinet, which is convenient for maintenance and inspection.

[0023] (2) The present invention distributes the output reactor and capacitor on both sides of the water-cooling plate inside the main housing, while the IGBT assembly is installed on the front of the water-cooling plate. Compared with the traditional inverter structure, the configuration is richer and the structure is more compact.

[0024] (3) The present invention can better improve the temperature rise in the installation cavity and the installation cabinet and extend the service life of each component by combining air cooling and water cooling and adding a heat exchanger structure.

[0025] (4) The fan in the present invention can be easily inserted into the fan rail and pushed into the inverter unit structure with the help of the fan fixing member, making replacement more convenient.

[0026] (5) In the present invention, after the inverter unit structure is lifted through the lifting holes on the main housing, the support beam below the main housing can be directly dropped onto the installation beam inside the inverter cabinet. The left and right sides of the inverter unit structure at the coil passing positions can be used as handles to push the inverter unit structure to the corresponding fixed position, making the overall installation in the cabinet more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0028] Figure 1 This is a schematic diagram of the structural explosion diagram of the narrow water-cooled inverter unit structure maintained before the present invention.

[0029] Figure 2 This is a diagram of the right side panel opening of the narrow water-cooled inverter unit structure maintained before the present invention.

[0030] Figure 3 This is the right side assembly diagram of the narrow water-cooled inverter unit structure maintained before the present invention.

[0031] Figure 4 This is a diagram of the heat dissipation pipeline in the narrow water-cooled inverter unit structure maintained before the present invention.

[0032] Figure 5 This is a front view of the narrow water-cooled inverter unit structure maintained by the present invention.

[0033] Figure 6 This is an open cover view of the narrow water-cooled inverter unit structure maintained before the present invention.

[0034] Figure 7 This is a view of the open cover of the narrow water-cooled inverter unit structure maintained before the present invention and the removal of the PCB assembly.

[0035] In the figure: 1-main shell, 2-side water cooling plate, 3-front water cooling plate, 4-top heat exchanger, 5-bottom heat exchanger, 6-fan, 7-cooling water inlet port 1, 8-cooling water outlet port 1, 9-cooling water inlet port 2, 10-cooling water outlet port 2, 11-capacitor, 12-output inductor, 13-absorption capacitor, 14-capacitor mounting plate, 15-laminated busbar, 16-capacitor support, 17-fan fixing part, 18-fan external transfer terminal, 19-fan slide rail, 20-support beam under the main shell, 21-I GBT main device, 22-I GBT drive board, 23-I GBT output row, 24-I GBT isolation seat, 25-power component, 26-control component, 27-upper mounting plate, 28-lower mounting plate, 29-upper panel, 30-lower panel, 31-left side panel, 32-right side panel, 33-coil, 34-lifting hole, 35-output row, 36-Hall element, 37-horizontal U-shaped groove, 38-PCB mounting plate fixing screws. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which 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 intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the 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 a limitation on the present invention.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] Example:

[0040] like Figure 1-Figure 7 As shown, an embodiment of the present invention discloses a front-maintained narrow water-cooled inverter unit structure, which mainly includes a main housing 1, a heat dissipation and cooling component and a complete machine component.

[0041] Specifically, a mounting cavity is formed inside the main shell 1 , and ventilation holes communicating with the mounting cavity are correspondingly provided at the upper and lower ends of the main shell 1 .

[0042] The heat dissipation and cooling components include a side water-cooling plate 2, a front water-cooling plate 3, a top heat exchanger 4, a bottom heat exchanger 5, and a fan 6. The side water-cooling plate 2 and the front water-cooling plate 3 are both fixed in the installation cavity, specifically, they are fixedly connected to the main shell 1 by bolts. The front water-cooling plate 3 is located in front of the side water-cooling plate 2 and is perpendicular to the extension surface of the side water-cooling plate 2; the top heat exchanger 4 is installed outside the upper ventilation hole of the main shell 1, the bottom heat exchanger 5 is installed inside the lower ventilation hole of the main shell 1, and the fan 6 is installed outside the lower ventilation hole of the main shell 1, that is, the bottom heat exchanger 5 is directly opposite to the top of the fan 6.

[0043] The cooling water input port 7 is connected to the water inlet of the bottom heat exchanger. The bottom heat exchanger 5, the front water-cooling plate 3, and the side water-cooling plate 2 are connected in series in sequence through the heat dissipation pipeline. The front water-cooling plate outlet and the side water-cooling plate outlet located on the upper side of the corresponding water-cooling plate are connected to the cooling water output port 8 as a whole through the heat dissipation pipeline.

[0044] That is, the cooling water flows into the bottom heat exchanger 5, the front water-cooling plate 3, and the side water-cooling plate 2 in sequence through the cooling water inlet 7 (the front water-cooling plate water inlet and the side water-cooling plate water inlet are both located on the lower side of the water-cooling plate), and then flows out through the front water-cooling plate outlet on the upper side of the front water-cooling plate and the side water-cooling plate outlet on the upper side of the side water-cooling plate, and finally flows out as a whole to the cooling water outlet 8 to cool the bottom heat exchanger 5, the front water-cooling plate 3, and the side water-cooling plate 2.

[0045] The cooling water inlet port 2 9 is connected to the water inlet of the top heat exchanger through a heat dissipation pipeline, and the water outlet of the top heat exchanger is connected to the cooling water outlet port 2 10 through a heat dissipation pipeline; the two cooling water inlets and the two cooling water outlets are both arranged on the outside of the main shell 1 to facilitate the connection of external cooling water equipment.

[0046] That is, the cooling water flows into the top heat exchanger 4 through the cooling water inlet port 2 9 , and then flows out through the top heat exchanger outlet port and finally flows out from the cooling water outlet port 2 10 to cool the top heat exchanger 4 .

[0047] The complete machine components arranged in the installation cavity include capacitors 11, output inductors 12, IGBT components, absorption capacitors 13 and PCB components. The capacitors 11 and the output inductors 12 are respectively distributed on the two side panels of the side water-cooling plate 2, and all IGBT components, absorption capacitors 13 and PCB components are all installed on the front side panel of the front water-cooling plate 3.

[0048] The present invention adopts a combination of air cooling and water cooling circuits and heat dissipation pipelines, and cools the bottom heat exchanger 5, the front water-cooling plate 3, the side water-cooling plate 2, and the top heat exchanger 4 through cooling water, and then uses the bottom fan 6 to cool the top heat exchanger 4, the bottom heat exchanger 5 and the inside and outside of the whole machine inverter unit structure module installed in the inverter cabinet, ultimately achieving the purpose of improving heat dissipation, increasing the service life of product components, and thereby improving product performance.

[0049] At the same time, the present invention adopts a separate water-cooling plate: the side water-cooling plate 2 dissipates heat for the capacitor 11 and the output inductor 12, and the front water-cooling plate 3 dissipates heat for the IGBT component, which effectively reduces the volume occupied by the water-cooling plate and reduces the cost problem caused by the large volume.

[0050] In a specific embodiment of the present invention, the capacitor 11 is pressed and installed on the corresponding side of the side water-cooling plate 2 using a capacitor mounting plate 14, and the tail of the capacitor 11 contacts the side water-cooling plate 2 to perform water cooling on the capacitor 11. A laminated busbar 15 is also installed between the capacitor 11 and the corresponding side plate.

[0051] Furthermore, in order to improve the heat dissipation effect, a heat conducting sheet is connected between the tail of the capacitor 11 and the side water cooling plate 2 .

[0052] Moreover, a capacitor support 16 for supporting the capacitor mounting plate 14 is also installed on the corresponding surface of the side water cooling plate 2. The capacitor support is used when there are many capacitors, which can effectively prevent the deformation of the capacitor mounting plate from causing the capacitor to be unable to fit closely to the side water cooling plate.

[0053] In the present invention, the main housing 1 and the capacitor mounting plate 14 form a main frame structure, and the water cooling plate and other components are installed and fixed accordingly on the frame structure.

[0054] In a specific embodiment of the present invention, the fan 6 is installed in the fan fixing member 17 with folded edges on both sides, and a shielding panel is installed on the front side of the fan fixing member 17, and a fan external adapter terminal 18 is set on the shielding panel; fan slide rails 19 extending in the front-to-back direction are installed near the edges on the left and right sides of the lower end surface of the main housing 1, and the lower support beams 20 of the main housing are also installed vertically downward on both sides of the lower end of the main housing 1; the fan fixing member 17 is adapted to be slidably connected with the fan slide rails 19. With the help of the fan fixing member 17, the fan 6 can be easily inserted into the fan slide rails 19 and pushed into the space surrounded by the lower support beams 20 of the main housing, and the fan 6 is aligned with the bottom heat exchanger 5 above.

[0055] Furthermore, the front sheet metal of the fan rail 19 has a certain slope angle to facilitate insertion. A certain angle space is left between the fan fixing member 17 and the shielding panel for installing the fan external adapter terminal 18 to facilitate the fan buckle and the connection of the fan outlet.

[0056] In the present invention, each IGBT assembly includes an IGBT main device 21 , an IGBT driving board 22 and an IGBT output row 23 , and the IGBT main device 21 is closely mounted on the front water cooling plate 3 .

[0057] To ensure the electrical safety distance between the IGBT of the medium and high voltage inverter and the pins of the absorption capacitor above it, an IGBT isolation seat 24 is installed between the pins of each IGBT main device 21 and the pins of the absorption capacitor 13 corresponding to its front side.

[0058] In a further specific embodiment, the PCB assembly includes a power component 25 installed on the upper side of the front water-cooling plate 3 through a PCB mounting plate and a control component 26 installed on the lower side of the front water-cooling plate 3 through a PCB mounting plate; the PCB mounting plate is a separate structure, including an upper mounting plate 27 corresponding to the power component 25 and a lower mounting plate 28 corresponding to the control component 26, and the upper mounting plate 27 and the lower mounting plate 28 are both detachably mounted on the front water-cooling plate 3 through PCB mounting plate fixing screws 38, and the power component 25 and the control component 26 are layered on the front side of the IGBT component with the help of their respective corresponding mounting plates. Since the PCB assembly in the present invention is not in close contact with the front water-cooling plate 3, the cooling of the power component 25 and the control component 26 relies on the air cooling of the fan.

[0059] In the present invention, a panel is detachably installed on the front side of the main shell 1. The panel is an integrated structure or a split structure. The panel with a split structure is divided into an upper panel 29 and a lower panel 30. The rear of the upper panel 29 corresponds to the power component 25, and the rear of the lower panel 30 corresponds to the control component 26.

[0060] Furthermore, corresponding interface terminals and other silk-screen or labeling contents can be added to the panel as required; at the same time, both sides of the panel can also be folded into a U-shape to increase the strength of the panel.

[0061] After the inverter unit structure of the present invention is installed in the cabinet, the panel can be disassembled to maintain the internal PCB components. Since the rear of the upper panel 29 and the lower panel 30 correspond to the power part and the control part respectively, the power component 25 and the control component 26 at the corresponding position can be maintained separately by disassembling each component separately.

[0062] In the present invention, the left and right sides of the main shell 1 correspond to the detachable left plate 31 and the right plate 32, and in order to ensure the electrical safety distance, the left plate 31 and the right plate 32 are insulated respectively, which can effectively reduce the width and overall size of the inverter unit structure module and improve the power density of the whole machine.

[0063] Furthermore, the left side plate 31 and the right side plate 32 are provided with corresponding coils 33 for passing each external control wire; meanwhile, a hoisting hole 34 is also provided on the upper part of the main housing 1 .

[0064] When the inverter unit structure module of the present invention is installed in the inverter cabinet, the module can be first lifted through the lifting hole 34 on the main housing 1, and then the support beam 20 below the main housing is dropped onto the installation beam in the cabinet. The left and right coils 33 can be used as handles to push the inverter unit structure module to the corresponding fixed position. When disassembly is required, the reverse operation can be performed.

[0065] In a specific embodiment of the present invention, an output row 35 for three-phase AC extends downward from the bottom outer side of the main shell 1, and a Hall element 36 installed in the installation cavity is connected to the output row 35. At the same time, a horizontal U-shaped groove 37 or a longitudinal U-shaped groove is opened at the lower end of the outer side of the output row 35 to facilitate wiring.

[0066] To achieve the above purpose, the embodiment of the present invention further proposes a frequency converter, which includes the front-maintained narrow water-cooled inverter unit structure described above. Specifically, the specific structure of the front-maintained narrow water-cooled inverter unit structure refers to the above embodiment. Since the frequency converter adopts all the technical solutions of the above embodiment, it at least has all the beneficial effects brought by the technical solutions of the above embodiment, which will not be repeated here.

[0067] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0068] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A front-maintained narrow water-cooled inverter unit structure, characterized in that: The heat dissipation and cooling component comprises a main shell, a heat dissipation and cooling component, and a whole machine component; an installation cavity is formed inside the main shell, and ventilation holes connected to the installation cavity are respectively arranged at the upper and lower ends of the main shell; the heat dissipation and cooling component comprises a side water-cooling plate, a front water-cooling plate, a top heat exchanger, a bottom heat exchanger, and a fan; the side water-cooling plate and the front water-cooling plate are both fixed in the installation cavity, the front water-cooling plate is located in the front side of the side water-cooling plate, and is perpendicular to the extension surface of the side water-cooling plate; the top heat exchanger is correspondingly installed outside the upper ventilation hole of the main shell, the bottom heat exchanger is correspondingly installed inside the lower ventilation hole of the main shell, and the fan is correspondingly installed outside the lower ventilation hole of the main shell; a cooling water inlet is connected to a water inlet of the bottom heat exchanger, and the The bottom heat exchanger, the front water-cooling plate, and the side water-cooling plate are connected in series in sequence through a heat dissipation pipeline. The front water-cooling plate outlet and the side water-cooling plate outlet located on the upper side of the corresponding water-cooling plate are integrally connected to the cooling water output port 1 through a heat dissipation pipeline; the cooling water input port 2 is connected to the top heat exchanger water inlet through a heat dissipation pipeline, and the top heat exchanger water outlet is connected to the cooling water output port 2 through a heat dissipation pipeline; the whole machine assembly arranged in the installation cavity includes a capacitor, an output inductor, an IGBT assembly, an absorption capacitor and a PCB assembly, and the capacitor and the output inductor are respectively distributed on the two side panels of the side water-cooling plate, and all the IGBT components, the absorption capacitor and the PCB assembly are all installed on the front side panel of the front water-cooling plate.

2. A front-maintained narrow water-cooled inverter unit structure according to claim 1, characterized in that: The capacitor is installed on the corresponding side of the side water cooling plate by using a capacitor installation plate, and the tail of the capacitor contacts the side water cooling plate, and a laminated busbar is installed between the capacitor and the corresponding side plate.

3. The front-maintained narrow water-cooled inverter unit structure according to claim 2, characterized in that: A heat conducting sheet is also connected between the tail of the capacitor and the side water cooling plate; and / or, a capacitor support member for supporting the capacitor mounting plate is also installed on the corresponding surface of the side water cooling plate.

4. The front-maintained narrow water-cooled inverter unit structure according to claim 1, characterized in that: The fan is installed in the fan fixing parts with folded edges on both sides, and a shielding panel is installed on the front side of the fan fixing parts, and the fan external adapter terminal is arranged on the shielding panel; fan slide rails extending in the front-to-back direction are installed on the left and right sides of the lower end surface of the main shell near the edge, and support beams below the main shell are also installed vertically downward on both sides of the lower end of the main shell; the fan fixing parts are adapted to be slidably connected with the fan slide rails.

5. The front-maintained narrow water-cooled inverter unit structure according to claim 1, characterized in that: Each of the IGBT components includes an IGBT main device, an IGBT driving board and an IGBT output row, and the IGBT main device is tightly installed on the front water cooling plate; an IGBT isolation seat is installed in the middle of the pins of each IGBT main device and in the middle of the pins of the absorption capacitor corresponding to its front side.

6. A front-maintained narrow water-cooled inverter unit structure according to claim 1 or 5, characterized in that: The PCB assembly includes a power component installed on the upper side of the front water-cooling plate through a PCB mounting plate and a control component installed on the lower side of the front water-cooling plate through a PCB mounting plate; the PCB mounting plate is a separate structure, including an upper mounting plate corresponding to the power component and a lower mounting plate corresponding to the control component, both the upper mounting plate and the lower mounting plate can be detachably installed on the front water-cooling plate, and the power component and the control component are layered on the front side of the IGBT component with the help of their respective corresponding mounting plates.

7. The front-maintained narrow water-cooled inverter unit structure according to claim 6, characterized in that: A panel is detachably mounted on the front side of the main shell, and the panel is an integrated structure or a split structure. The panel of the split structure is divided into an upper panel and a lower panel. The rear of the upper panel corresponds to the power component, and the rear of the lower panel corresponds to the control component.

8. The front-maintained narrow water-cooled inverter unit structure according to claim 1, characterized in that: The left and right sides of the main shell respectively correspond to detachably mounted left and right plates, and the left and right plates are insulated respectively, and the left and right plates are respectively provided with coils for passing through various control external wires; and / or, a lifting hole is provided on the upper part of the main shell.

9. The front-maintained narrow water-cooled inverter unit structure according to claim 1, characterized in that: An output row for three-phase AC extends downward from the bottom outer side of the main shell, and the Hall element installed in the installation cavity is connected to the output row. A horizontal U-shaped groove or a longitudinal U-shaped groove is opened at the lower end of the outer side of the output row.

10. A frequency converter, characterized by comprising the front-maintained narrow water-cooled inverter unit structure according to any one of claims 1 to 9.

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