Modular high reliability inverter

Abstract

The application discloses a modular high-reliability inverter, and relates to the technical field of power systems, which comprises a shell, a bus connecting module arranged in the interior of the shell and used for connecting a direct-current circuit and an alternating-current circuit, a plurality of power module groups which are connected in a hot-plugging mode and linearly distributed on the bus connecting module and used for converting direct current into alternating current, and an adjusting module arranged in the interior of the shell and located on the upper side of the bus connecting module, wherein the adjusting module comprises a linear driving element, a clamping element and a telescopic clamping element which are arranged on the moving end of the linear driving element, and the positions of the plurality of power module groups arranged on the bus connecting module are located in the moving stroke range of the linear driving element. The application realizes dynamic adjustment of the number of the power module groups through the adjusting module, significantly enhances the adaptability of the system under dynamic load, and provides flexible and efficient power management support for the high-reliability inverter.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power systems, in particular to a modular high-reliability inverter. BACKGROUND

[0002] With the rapid development of renewable energy, megawatt or tens of megawatt level solar high-temperature heat power generation systems are widely used in the world, and the core is efficient and stable power conversion and output. As a key device for converting direct current to alternating current, the inverter plays a crucial role in such large-scale systems, and its reliability directly affects the operation stability, power generation efficiency and equipment life of the power station.

[0003] Traditional modular inverters (such as SMA Sunny Tripower series, KACO blueplanet series) usually use a fixed number of power modules, and the number of modules is determined in the design stage, which cannot be dynamically adjusted according to the actual load demand. This fixed design has obvious limitations in solar high-temperature heat power generation systems. On the one hand, in the case of changing sunlight or dynamic load (such as low irradiance in the morning and evening or microgrid load fluctuation), when the load is low (such as 500kW), too many modules running leads to efficiency decline (usually below 96%), and inefficient operation not only increases thermal stress and accelerates module aging (usually only 10-12 years), but also superimposes high-temperature environment, further reducing system reliability. On the other hand, when the load suddenly increases (such as 1MW or more), insufficient number of modules may cause overload, leading to increased system failure rate, even shutdown, which seriously affects the continuous operation of megawatt-level power stations. In addition, the fixed module design is difficult to realize the rapid isolation and replacement of failed modules, and once a module fails due to high temperature or IGBT overheating, it may cause the entire system to malfunction, significantly reducing the mean time between failures, and it is difficult to meet the requirements of tens of megawatt level solar heat power generation systems for high reliability and long service life equipment. SUMMARY

[0004] The purpose of the present application is to provide a modular high-reliability inverter, which solves the problem that the traditional modular inverter usually uses a fixed number of power modules, resulting in increased system failure rate, even shutdown, which seriously affects reliability.

[0005] The present application solves the above technical problems by the following technical solutions, the present application comprises:

[0006] a housing;

[0007] a bus connection module, which is arranged in the interior of the housing, for connecting the direct current circuit and the alternating current circuit;

[0008] A plurality of power module groups, the plurality of power module groups are connected in hot plug and linearly distributed on the bus connecting module, and the power module groups are used for converting direct current into alternating current;

[0009] An adjusting module is arranged inside the shell and located on the upper side of the bus connecting module, the adjusting module comprises a linear drive, a clamping piece arranged on the moving end of the linear drive, and a telescopic clamping piece, the positions of the plurality of power module groups arranged on the bus connecting module are located within the moving stroke range of the linear drive, the clamping piece is used for fixing the power module groups, and the telescopic clamping piece is used for plugging the power module groups, fixing the power module groups on the bus connecting module or the clamping piece, so as to adjust the number of the power module groups;

[0010] A main control unit is arranged on the shell and used for controlling the operation of the bus connecting module, the power module groups and the adjusting module.

[0011] Preferably, the bus connecting module comprises a bus plug-in board, the bus plug-in board is internally provided with a direct current transmission line and an alternating current transmission line, the outer sides of the two ends of the shell are respectively provided with DC terminals and AC terminals, the direct current transmission line and the alternating current transmission line are respectively electrically connected with the DC terminals and the AC terminals through bus connectors, the direct current transmission line and the alternating current transmission line are respectively provided with a plurality of direct current plug-in terminals and a plurality of alternating current plug-in terminals, each of the direct current plug-in terminals and the alternating current plug-in terminals constitutes a plug-in position, and the power module groups are arranged in the plug-in positions in hot plug.

[0012] Preferably, the power module group comprises at least two power module units, and the power module units are connected through a fixing frame.

[0013] Preferably, the clamping piece comprises two mounting frames, the two mounting frames are respectively rotatably arranged on the two ends of the moving end of the linear drive, and the mounting frames are provided with a plurality of annularly distributed first clamps.

[0014] The two ends of the fixing frame are respectively provided with outer circular clamping blocks, and the outer circular clamping blocks are clamped and fixed with the first clamps.

[0015] The first clamps are provided with positioning grooves, the outer circular clamping blocks are fixed with positioning blocks, and the positioning blocks are matched with the positioning grooves.

[0016] Preferably, the inner wall of the shell is fixed with a horizontal strip, the horizontal strip is parallel to the moving path of the moving end of the linear drive, the horizontal strip is provided with a plurality of intermittently arranged gear racks, and the mounting frames are fixed with and sleeved with outer gear rings of the moving end of the linear drive.

[0017] Preferably, an angular positioning structure is arranged between the outer gear ring and the moving end of the linear drive.

[0018] The angular positioning structure comprises a plurality of semispherical grooves formed in the inner wall of the outer gear ring, and the semispherical grooves are respectively matched with a plurality of first clamps; the moving end of the linear driving member is provided with a groove, and the groove is provided with a spring and a limiting block from inside to outside.

[0019] Preferably, the telescopic clamping member comprises an electric push rod fixed to the middle part of the moving end of the linear driving member, and the telescopic end of the electric push rod is fixed with a second clamp; the fixed frame is provided with an inner circular clamping block matched with the second clamp.

[0020] Preferably, a triangular inner cavity is formed in the inner cavity of the second clamp, a circular push rod is hung in the triangular inner cavity through at least two hanging ropes, and arc-shaped grooves are formed in the two sides of the triangular inner cavity; the inner circular clamping block is fixed with a protruding block corresponding to the triangular inner cavity.

[0021] Preferably, the moving end of the linear driving member is fixed with two abutting blocks, and the two ends of the circular push rod extend out of the triangular inner cavity, and the two abutting blocks are respectively matched with the two ends of the circular push rod.

[0022] Preferably, the linear driving member comprises a screw rod rotatably installed on the shell and an optical axis fixed to the shell; the outer side of the shell is fixed with a motor for driving the screw rod to rotate; the screw rod is threadedly connected with an inner threaded cylinder; the optical axis is slidably connected with a moving block; the inner threaded cylinder and the moving block are jointly connected with a circular block; and the circular block is the moving end of the linear driving member.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] 1. The present application can realize dynamic adjustment of the number of power module groups through the adjusting module, significantly enhance the adaptability of the system under dynamic load (such as photovoltaic sunlight fluctuation), and provide flexible and efficient power management support for high-reliability inverters.

[0025] 2. The present application can store multiple power module groups through the rotating mounting frame, reduce the maintenance space requirement, compact the overall structure, reduce power consumption, facilitate integration in outdoor environments (such as desert photovoltaic power stations), and significantly improve the space efficiency and practicality of modular high-reliability inverters.

[0026] 3. The present application utilizes the intermittent rack on the horizontal strip matched with the outer gear ring on the mounting frame to drive the mounting frame to rotate, automatically adjusts the position of the power module group, optimizes the structure weight, cooperates with the locking angle of the angular positioning structure, saves space and improves stability, and provides a simple and efficient adjustment mechanism for modular high-reliability inverters.

[0027] 4、The application pushes the circular push rod in the triangular inner cavity through the convex block on the inner circular clamping block, and makes the first arc-shaped part and the second arc-shaped part of the second clamping part expand outward when the electric push rod extends, delays the closing, avoids the interference with the inner circular clamping block, and improves the stability of the power module group installation. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the application;

[0029] Figure 2 It is a schematic diagram of the front view and sectional view structure of the application;

[0030] Figure 3 It is a schematic diagram of the internal structure of the shell;

[0031] Figure 4 It is a schematic diagram of the three-dimensional structure of the power module group in the application;

[0032] Figure 5 It is a schematic diagram of the three-dimensional structure of the clamping part and the telescopic part in the adjusting module;

[0033] Figure 6 It is a schematic diagram of the half-sectional structure of the clamping part and the telescopic part in the adjusting module;

[0034] Figure 7 It is a schematic diagram of the enlarged structure at A in the application; Figure 6

[0035] Figure 8 It is a schematic diagram of the sectional view plane structure of the clamping part in the adjusting module.

[0036] The numbers in the figure represent:

[0037] 1-shell;11-heat dissipation fan;12-ventilation window;2-master control unit;31-bus plug-in board;32-bus connector;33-AC terminal;34-DC terminal;4-power module group;41-power module;42-fixing frame;43-outer circular clamping block;44-inner circular clamping block;45-positioning block;51-optical axis;52-screw;53-motor;541-transverse bar;542-rack;543-outer gear ring;55-circular block;56-mounting frame;561-first clamping part;562-positioning groove;57-telescopic clamping part;571-electric push rod;572-second clamping part;573-convex block;574-triangular inner cavity;575-circular push rod;576-resisting block;577-arc-shaped groove;578-hanging rope;581-hemispherical groove;582-spring;583-limiting block. DETAILED DESCRIPTION

[0038] The above and other technical features and advantages of the application will be made more apparent through the following detailed description of the application in conjunction with the accompanying drawings. ​

[0039] The embodiment provides a technical scheme: as shown in a modular high-reliability inverter, including a shell 1, a bus connection module, a plurality of power module groups 4, a regulating module and a main control unit 2. The main control unit 2 is installed on the shell 1, used for controlling the operation of the bus connection module, the power module group 4 and the regulating module. Figures 1 to 7

[0040] The shell 1 adopts a solid metal shell structure, one side wall of which is provided with a cooling fan 11, and the other side is provided with a ventilation window 12, and a filter screen is installed in the ventilation window 12. When the cooling fan 11 operates, the external air enters the inside of the shell 1, realizes the air circulation in the inside of the shell 1, performs heat dissipation to maintain the operation temperature of the internal components, and ensures the stable performance in a high-temperature environment. The shell 1 is composed of a shell body and a detachably installed cover body, facilitating maintenance and module replacement. The cover body adopts a sealing design, and the protection level reaches IP65, preventing dust and moisture from entering, and improving the durability of the system in an outdoor environment.

[0041] The bus connection module is arranged in the inside of the shell 1, used for connecting the direct-current circuit and the alternating-current circuit, and dynamically increasing or decreasing the number of the power module groups 4; the bus connection module comprises a bus plugboard 31, the inside of the bus plugboard 31 is provided with a direct-current transmission line and an alternating-current transmission line, the outside of the two ends of the shell 1 is respectively provided with a DC terminal 34 and an AC terminal 33, the direct-current transmission line and the alternating-current transmission line are respectively electrically connected with the DC terminal 34 and the AC terminal 33 through a bus connector 32, the direct-current transmission line and the alternating-current transmission line each have a plurality of direct-current plug-in terminals and a plurality of alternating-current plug-in terminals, each direct-current plug-in terminal is close to each alternating-current plug-in terminal, and a plug-in position is formed, one power module group is arranged in one plug-in position, and a plurality of plug-in positions are arranged in a straight line array.

[0042] The bus connection module is the electrical core of the modular high-reliability inverter, responsible for the seamless connection of direct-current input, power distribution and alternating-current output. The working principle is as follows: first, the DC terminal 34 receives an external direct-current power supply (such as a photovoltaic array), and transmits it to the direct-current transmission line of the bus plugboard 31 through the bus connector 32; the bus plugboard 31 divides the direct-current power equally to a plurality of power module groups 4, each module group 4 obtains direct-current input through the direct-current plug-in terminal, and realizes parallel operation; then, the power module group 4 converts the direct-current power into alternating-current power, and the alternating-current power is transmitted to the AC terminal 33 through the alternating-current transmission line, and is connected to the power grid.

[0043] ​The plurality of power module groups 4 are connected in hot plug and linearly distributed on the bus connecting module, support dynamic adjustment of the number of modules, and support efficient operation of the system under different loads; the power module group 4 is used for converting direct current into alternating current; the power module group 4 comprises at least two power module units 41, and in the embodiment, the power module group 4 has two power module units 41, and the power module units 41 are connected through the fixed frame 42.

[0044] The adjusting module is arranged inside the shell 1 and located on the upper side of the bus connecting module, and is used for realizing automatic adjustment of the number of power module groups 4; the adjusting module comprises a linear drive, a clamping piece mounted on the moving end of the linear drive, and a telescopic clamping piece 57, the positions of the plurality of power module groups 4 mounted on the bus connecting module are located within the moving stroke range of the linear drive, the clamping piece is used for fixing and accommodating the power module group 4, and the telescopic clamping piece 57 is used for plugging and unplugging the power module group 4, and the power module group 4 is fixed on the bus connecting module or the clamping piece, so as to realize adjustment of the number of power module groups 4.

[0045] The linear drive comprises a screw rod 52 rotatably mounted on the shell 1 and an optical axis 51 fixed to the shell 1, an electric machine 53 for driving the screw rod 52 to rotate is fixed to the outer side of the shell 1, an internal thread cylinder is threadedly connected to the screw rod 52, a moving block is slidably connected to the optical axis 51, and a circular block 55 is commonly connected between the internal thread cylinder and the moving block, and the internal thread cylinder, the moving block and the circular block 55 are the moving end of the linear drive. The rotation of the screw rod 52 driven by the electric machine 53 is converted into the linear movement of the internal thread cylinder, the moving block and the circular block 55 along the optical axis 51, so as to realize accurate positioning of the adjusting module and plugging and unplugging operation of the power module group.

[0046] The clamping piece comprises two mounting frames 56 rotatably mounted on both ends of the moving end of the linear drive, and the mounting frame 56 has a plurality of annularly distributed first clamps 561; the both ends of the fixed frame 42 are provided with outer circular clamping blocks 43, the outer circular clamping blocks 43 are clamped and fixed with the first clamps 561; the first clamps 561 are provided with positioning grooves 562, the outer circular clamping blocks 43 are fixed with positioning blocks 45, and the positioning blocks 45 are matched with the positioning grooves 562.

[0047] The inner wall of the shell 1 is fixed with a horizontal bar 541 parallel to the moving path of the moving end of the linear drive, the horizontal bar 541 is provided with a plurality of intermittently arranged racks 542, each rack 542 is located between the corresponding two power module groups 4, and the mounting frame 56 is fixed with and sleeved with an external gear ring 543 of the moving end of the linear drive.

[0048] When the circular block 55 is driven to move linearly by the linear driving member, the mounting frame 56 can be rotated by a certain angle when the outer gear ring 543 is in contact with the corresponding rack 542 due to the meshing of the rack 542 and the outer gear ring 543. When the rack 542 is no longer meshed with the gear 543, the corresponding first clamp 561 is moved towards the busbar connector plate 31. When the corresponding first clamp 561 is moved to the position of the power module group 4 on the busbar connector module, the movement of the circular block 55 is stopped, and the power module group 4 is pulled out from the busbar connector plate 31 and fixed on the corresponding first clamp 561 by the telescopic clamping member 57, or the power module group 4 on the first clamp 561 is installed on the busbar connector plate 31. Through the precise cooperation of the intermittently arranged rack 542 and the outer gear ring 543, the flexible rotation of the mounting frame 56 is realized, thereby optimizing the mechanical structure and reducing the use of complex components.

[0049] An angular positioning structure is arranged between the moving end of the linear driving member and the outer gear ring 543, which is used to accurately control the rotation angle of the mounting frame 56. The angular positioning structure includes a plurality of semispherical grooves 581 formed in the inner wall of the outer gear ring 543, and the plurality of semispherical grooves 581 are respectively matched with the plurality of first clamps 561. The moving end of the linear driving member is provided with a groove, and a spring 582 and a limiting block 583 are arranged in the groove from inside to outside. The outer end of the limiting block 583 is semispherical, and the force of the spring 582 will extrude the limiting block 583 into the semispherical groove 581 to soft-fix the angle of the outer gear ring 543 and the mounting frame 56, thereby realizing the precise locking and resetting of the angle of the gear 543. When the rack 542 cooperates with the outer gear ring 543, the limiting block 583 will be extruded into the groove, and the spring 582 will be compressed.

[0050] The telescopic clamping member 57 includes an electric push rod 571 fixed to the middle position of the moving end of the linear driving member, and a second clamp 572 is fixed to the telescopic end of the electric push rod 571. The fixed frame 42 has an inner circular clamping block 44 matched with the second clamp 572.

[0051] The first clamping piece 561 and the second clamping piece 572 are made of elastic plastic, each has two first arc-shaped parts, and the end of each first arc-shaped part is fixed with a second arc-shaped part extending to the outside. When the outer circular clamping block 43 contacts the second arc-shaped part of the first clamping piece 561 or the inner circular clamping block 44 contacts the second arc-shaped part of the second clamping piece 572, the corresponding first arc-shaped part and the second arc-shaped part will expand to the outside, the outer circular clamping block 43 is clamped into the first clamping piece 561 or the inner circular clamping block 44 is clamped into the second clamping piece 572, and fixing is realized. It should be noted that the thickness of the first arc-shaped part and the second arc-shaped part of the first clamping piece 561 is smaller than the thickness of the first arc-shaped part and the second arc-shaped part of the second clamping piece 572, so that the force required for deformation of the first arc-shaped part and the second arc-shaped part of the first clamping piece 561 is smaller than the force required for deformation of the first arc-shaped part and the second arc-shaped part of the second clamping piece 572, and thus the clamping force of the first clamping piece 561 is smaller than the clamping force of the second clamping piece 572.

[0052] When the power module group 4 on the bus plug-in board 31 needs to be disassembled and mounted to the mounting frame 56, the telescopic end of the electric push rod 571 is extended, so that the second clamping piece 572 is displaced to softly clamp the inner circular clamping block 44, then the telescopic end of the electric push rod 571 is retracted, so that the power module group 4 is pulled off from the bus plug-in board 31, and the telescopic end of the electric push rod 571 is continuously retracted until the outer circular clamping block 43 contacts the first clamping piece 561 of the mounting frame 56. Since the clamping force of the first clamping piece 561 is smaller than the clamping force of the second clamping piece 572, when the outer circular clamping block 43 pushes the first clamping piece 561 to deform to the outside, the second clamping piece 572 will not be separated from the inner circular clamping block 44, so as to ensure that the power module group 4 is smoothly mounted to the first clamping piece 561 of the mounting frame 56, and then the telescopic end of the electric push rod 571 is continuously retracted until the second clamping piece 572 is separated from the inner circular clamping block 44.

[0053] In order to smoothly separate the second clamping piece 572 from the inner circular clamping block 44 after the power module group 4 is mounted to the bus plug-in board 31, without affecting the stability of the power module group 4, a triangular inner cavity 574 is communicated and arranged in the inner cavity of the second clamping piece 572. The triangular inner cavity 574 is arranged so that the first arc-shaped part and the second arc-shaped part of the second clamping piece 572 can expand to a larger size to the outside. A circular push rod 575 is hung in the triangular inner cavity 574 through at least two hanging ropes 578. The two hanging ropes 578 prevent the circular push rod 575 from being separated from the second clamping piece 572. Arc-shaped grooves 577 are arranged on both sides of the triangular inner cavity 574, and a protruding block 573 corresponding to the triangular inner cavity 574 is fixed on the inner circular clamping block 44.

[0054] The moving end of the linear driving part is fixed with two abutting blocks 576, and the two ends of the circular push rod 575 extend out of the triangular inner cavity 574. The two abutting blocks 576 correspond to the two ends of the circular push rod 575, respectively.

[0055] When it is needed to install the power module group 4 on the mounting frame 56 to the busbar panel 31, the telescopic end of the electric push rod 571 is extended to displace the second clamping 572 to clamp the inner circular block 44, and the telescopic end of the electric push rod 571 is continuously extended to drive the power module group 4 to displace downward, further extrude the first arc-shaped part of the first clamping 561 outward by the outer circular block 43, until the first clamping 561 is separated from the outer circular block 43, and the telescopic end of the electric push rod 571 is continuously extended downward to a certain size, on the one hand, the power module group 4 is installed firmly, and on the other hand, the convex block 573 pushes the circular push rod 575, the circular push rod 575 is clamped in the two arc-shaped grooves 557 and cannot be moved, the first arc-shaped part and the second arc-shaped part of the second clamping 572 are expanded outward by the circular push rod 575, so that the second clamping 572 is opened, and it is needed to note that the gap of the first arc-shaped part and the second arc-shaped part of the two sides is greater than the diameter of the inner circular block 44, at this time, the telescopic end of the electric push rod 571 is retracted to avoid the contact between the inner circular block 44 and the first arc-shaped part and the second arc-shaped part of the second clamping 572, so that the inner circular block 44 and the second clamping 572 are separated smoothly, when the telescopic end of the electric push rod 571 is retracted to the shortest stroke, the second clamping 572 is moved upward, and the circular push rod 575 on the second clamping 572 is in contact with the end of the abutting block 576, under the abutting force of the abutting block 576, the circular push rod 575 is pushed to disengage from the arc-shaped groove 577 to the original position, and the second clamping 572 is closed to restore to the state of preparation work.

[0056] It is needed to note that the number of the telescopic clamping 57 and the inner circular block 44 can be set to two, and is distributed along the width direction of the circular block 55 to increase the stability of the power module group 4.

[0057] The above only describes the preferred embodiments of the present application, which are only illustrative but not limited. It is understood by those skilled in the art that many changes, modifications and even equivalents can be made to the present application within the spirit and scope defined by the claims of the present application, and all of them will fall within the protection scope of the present application.

Claims

1. A modular high reliability inverter, characterized by, The utility model relates to a power module group adjusting device, including: A shell; Bus connecting module is arranged in the inside of shell, is used for connecting DC circuit and AC circuit; A plurality of power module groups, a plurality of the power module groups are connected with hot plug and linear distribution in bus connecting module, and the power module group is used to convert DC into AC; Adjusting module is arranged in the inside of shell and is located bus connecting module upside, and the adjusting module includes linear drive, the clamping piece of installation in the moving end of linear drive and telescopic clamping piece, a plurality of the power module groups are installed in the position of bus connecting module and are all located in the moving stroke range of linear drive, the clamping piece is used to fix the accommodation power module group, and the telescopic clamping piece is used to carry out the plug of power module group, and power module group is fixed in bus connecting module or clamping piece, so as to realize the adjustment of the number of power module group; Main control unit is installed in shell and is used to control the operation of bus connecting module, power module group and adjusting module.

2. The modular, high-reliability inverter of claim 1, wherein, The bus connecting module includes a bus plug-in board, a DC transmission line and an AC transmission line are arranged inside the bus plug-in board, DC terminals and AC terminals are respectively installed on the outer sides of the two ends of the shell, the DC transmission line and the AC transmission line are respectively electrically connected with the DC terminals and the AC terminals through bus connectors, the DC transmission line and the AC transmission line each have a plurality of DC plug-in terminals and a plurality of AC plug-in terminals, each of the DC plug-in terminals and the AC plug-in terminals forms a plug-in position, and the power module group is arranged in the plug-in position with hot plug.

3. The modular, high-reliability inverter of claim 1, wherein, The power module group includes at least two power module units, and the power module units are connected through a fixing frame.

4. The modular, high-reliability inverter of claim 3, wherein, The clamping piece includes two mounting frames, the two mounting frames are respectively rotatably mounted on the two ends of the moving end of the linear drive, and the mounting frame has a plurality of annularly distributed first clamps. The fixing frame has an outer circular clamping block at each end, the outer circular clamping block is clamped and fixed with the first clamp; A positioning groove is formed in the first clamp, and a positioning block is fixed on the outer circular clamping block, and the positioning block is matched with the positioning groove.

5. The modular, high-reliability inverter of claim 4, wherein, A horizontal bar is fixed on the inner wall of the shell, the horizontal bar is parallel to the moving path of the moving end of the linear drive, the horizontal bar has a plurality of intermittently arranged racks, and the mounting frame has an outer gear ring fixed thereon and sleeved on the moving end of the linear drive.

6. The modular, high-reliability inverter of claim 5, wherein, An angular positioning structure is arranged between the outer gear ring and the moving end of the linear drive. The angular positioning structure includes a plurality of semispherical grooves formed in the inner wall of the outer gear ring, and the plurality of semispherical grooves are matched with the plurality of first clamps, respectively, a recess is formed in the moving end of the linear drive, and a spring and a limiting block are arranged from inside to outside in the recess.

7. The modular, high-reliability inverter of claim 3, wherein, The telescopic clamping piece includes an electric push rod fixed on the middle part of the moving end of the linear drive, a second clamp is fixed on the telescopic end of the electric push rod, and the fixing frame has an inner circular clamping block matched with the second clamp.

8. The modular, high-reliability inverter of claim 7, wherein, A triangular inner cavity is formed in the inner cavity of the second clamp, a circular push rod is hung in the triangular inner cavity through at least two hanging ropes, arc-shaped grooves are formed on the two sides of the triangular inner cavity, and a protruding block corresponding to the triangular inner cavity is fixed on the inner circular clamping block.

9. The modular, high-reliability inverter of claim 8, wherein, The moving end of the straight line driving part is fixed with two abutting blocks, and the two ends of the circular push rod extend out triangular inner cavities, and the two abutting blocks correspond to the two ends of the circular push rod respectively.

10. The modular, high-reliability inverter of claim 1, wherein, The straight line driving part comprises a screw rod rotatably installed on a shell and an optical axis fixed to the shell, a motor for driving the screw rod to rotate is fixed to the outside of the shell, an internally threaded cylinder is threadedly connected to the screw rod, a moving block is slidably connected to the optical axis, and a circular block is jointly connected between the internally threaded cylinder and the moving block, and the circular block is the moving end of the straight line driving part.

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