Frequency converter system

Abstract

The utility model discloses a frequency converter system, which comprises a cabinet shell, a control unit, a power connection unit and a plurality of frequency converters, a plurality of installation subareas are formed in the cabinet shell, the plurality of installation subareas comprise a power distribution unit subarea and a frequency conversion subarea, the frequency conversion subarea comprises a plurality of frequency conversion unit subareas, the control unit is arranged in the power distribution unit subarea, and the power connection unit is arranged in the frequency conversion unit subarea. The power connection unit comprises an electric access structure and an electric access structure, the electric access structure is arranged in the power distribution unit subarea and is arranged at intervals with the control unit, the plurality of frequency converters are arranged in the plurality of frequency conversion unit subareas, each frequency converter is connected to the electric access structure, the electric access structure and the control unit, and the electric access structure is arranged in the frequency conversion subarea and is arranged at intervals with the control unit. Reasonable partition layout of each unit structure in the cabinet shell is realized, incoming line connection only needs to be operated in the power distribution unit partition, and outgoing line connection only needs to be operated in the frequency conversion partition, so that the application convenience of equipment is improved, and the user experience is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to frequency converter system technical field especially relates to a kind of frequency converter systems. BACKGROUND

[0002] Commonly used frequency converter drives electrical load, such as motor, frequency converter adjusts motor speed by changing the power frequency supplied to motor, frequency converter is usually installed in cabinet, and then the output end of frequency converter in cabinet is connected to motor.In some applications, one electrical load is driven by multiple frequency converters, due to the increase of control equipment, the layout of each unit in the cabinet is unreasonable, which makes the wiring of incoming and outgoing lines very inconvenient, affecting user experience. SUMMARY

[0003] The main purpose of the utility model is to provide a kind of frequency converter system, to optimize frequency converter system, to increase the convenience of equipment application, improve user experience.

[0004] To achieve the above object, the utility model provides a kind of frequency converter system, the frequency converter system includes:

[0005] Cabinet shell, the cabinet shell is formed with multiple installation subareas distributed along horizontal direction in, multiple installation subareas include power distribution unit subarea and frequency conversion subarea, and the frequency conversion subarea includes multiple frequency conversion unit subareas;

[0006] Control unit, be located in the power distribution unit subarea, to be electrically connected with external control circuit;

[0007] Electricity access unit, including electric access structure and electric exit structure, the electric access structure is located in the power distribution unit subarea, and the control unit is arranged with interval, to be electrically connected with external power supply circuit, and the electric exit structure is located in the frequency conversion subarea, to be electrically connected with external electrical load;And,

[0008] Multiple frequency converters, are located in multiple frequency conversion unit subareas, each frequency converter is electrically connected with electric access structure, electric exit structure and control unit.

[0009] In an embodiment, the power distribution unit subarea includes first power distribution subarea and second power distribution subarea arranged with interval in up-down direction;

[0010] The control unit is located in the first power distribution subarea, and the electric access structure is located in the second power distribution subarea.

[0011] In an embodiment, the control unit includes module shell and control circuit board located in the module shell, and the control circuit board is electrically connected with external control circuit and each frequency converter.

[0012] In an embodiment, the electrical access structure comprises:

[0013] a wiring switch having a switch input and a switch output;

[0014] a line-in terminal electrically connected to the switch input for external power line access;

[0015] a line-out terminal electrically connected to one end of the switch output; and,

[0016] a plurality of fuses electrically connected to a plurality of conductive terminals of the other end of the line-out terminal and electrically connected to each of the frequency converters.

[0017] In an embodiment, a plurality of the fuses are arranged corresponding to an access area formed in the power distribution unit partition and capable of being exposed from the access area for maintenance by an operator.

[0018] In an embodiment, a first protective plate is arranged in the power distribution unit partition, the first protective plate being arranged corresponding to at least a front side of the line-in terminal; and / or,

[0019] a second protective plate is arranged in the power distribution unit partition, the second protective plate being arranged corresponding to at least a front side of the line-out terminal.

[0020] In an embodiment, a first wiring channel extending longitudinally is arranged in the power distribution unit partition, one end of the first wiring channel being arranged corresponding to a bottom wall of the cabinet housing for external control line access and the other end being arranged corresponding to the control unit; and / or,

[0021] a grounding structure is arranged in the power distribution unit partition; and / or,

[0022] a plurality of first wire-through holes are arranged on the bottom wall of the power distribution unit partition of the cabinet housing.

[0023] In an embodiment, the electrical access structure comprises:

[0024] a plurality of line-out terminals arranged in the frequency conversion partition; and,

[0025] a first power consumption wiring structure electrically connected to each of the plurality of line-out terminals and a plurality of output terminals of each of the frequency converters.

[0026] In an embodiment, a third protective plate is arranged in the frequency conversion partition, the third protective plate being arranged corresponding to at least a front side of the plurality of line-out terminals.

[0027] In an embodiment, the power connection unit further comprises a second power supply wiring structure arranged in the cabinet shell, the second power supply wiring structure is arranged in one-to-one correspondence with the frequency converters, one end of the second power supply wiring structure is electrically connected to the power connection structure, and the other end is electrically connected to the corresponding frequency converter.

[0028] In an embodiment, the second power supply wiring structure is at least partially arranged at the back of the cabinet shell; and / or,

[0029] The two adjacent frequency unit partitions include a first frequency unit partition close to the power distribution unit partition, and a second frequency unit partition away from the first frequency unit partition, and the second power supply wiring structure corresponding to the second frequency unit partition is at least partially behind the second power supply wiring structure corresponding to the first frequency unit partition.

[0030] In an embodiment, the plurality of frequency unit partitions include an end frequency unit partition at the end of the cabinet shell, and at least one intermediate frequency unit partition between the end frequency unit partition and the power distribution unit partition.

[0031] A transverse second wiring groove is arranged in the frequency partition, one end of the second wiring groove corresponds to the control unit, and the other end passes through at least one intermediate frequency unit partition and corresponds to the end frequency unit partition.

[0032] In an embodiment, a DC positive and negative bus parallel structure is further arranged in the frequency partition, the DC positive and negative bus parallel structure is electrically connected to the frequency converters arranged in the two adjacent frequency unit partitions; and / or,

[0033] A reserved braking line is further arranged in the frequency partition, so that each frequency converter is electrically connected to an external braking unit.

[0034] In an embodiment, a mounting guide rail is arranged on the inner bottom wall of the cabinet shell, for limiting the sliding of the frequency converter; and / or,

[0035] The frequency converter system further comprises a frequency converter pushing tool, the frequency converter pushing tool comprises a tool plate, two parallel sliding grooves are formed on the tool plate, one end of the tool plate can be lapped on the inner bottom wall of the frequency unit partition, and the other end is used to abut against the ground, and the frequency converter can be pushed into the frequency unit partition obliquely upward.

[0036] In an embodiment, a base is arranged on the outer bottom wall of the cabinet shell, a forklift hole is formed on the base, and the fork arm of a forklift can be inserted into the forklift hole; and / or,

[0037] A lifting beam is arranged on the outer top wall of the cabinet shell, and a lifting connecting hole is arranged on the lifting beam.

[0038] In an embodiment, an air guide cavity is defined at the top of the frequency conversion unit partition;

[0039] The air guide cavity is provided with a cavity air outlet and a cavity air inlet, the cavity air inlet is used to guide the air flow out of the frequency converter, and the cavity air outlet is used to guide the air flow in the air guide cavity out of the cabinet shell.

[0040] In the technical scheme of the utility model, the power distribution unit partition and the frequency conversion partition are formed in the cabinet shell, the control unit and the electrical access structure are arranged in the power distribution unit partition, and the frequency converter and the electrical access structure are arranged in the frequency conversion partition, so that the reasonable partition and arrangement of the units in the cabinet shell are realized, the incoming line (strong current line and weak current line) only needs to be operated in the power distribution unit partition, and the outgoing line (strong current line) only needs to be operated in the frequency conversion partition, the convenience of application of the equipment is improved, and the user experience is improved. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0042] Figure 1 The utility model provides the main view structural schematic diagram of frequency converter system;

[0043] Figure 2 The utility model provides the three-dimensional structural schematic diagram of frequency converter system in Figure 1 The utility model provides the rear view structural schematic diagram of frequency converter system in

[0044] Figure 3 The utility model provides the rear view structural schematic diagram of frequency converter system in Figure 1 The utility model provides the rear view structural schematic diagram of frequency converter system in

[0045] Figure 4 The utility model provides the main view structural schematic diagram of frequency converter system (hidden cabinet door) in Figure 1 The utility model provides the main view structural schematic diagram of frequency converter system (hidden cabinet door) in

[0046] Figure 5 The utility model provides the main view structural schematic diagram of frequency converter system (hidden first protective plate, second protective plate and third protective plate) in Figure 4 The utility model provides the main view structural schematic diagram of frequency converter system (hidden first protective plate, second protective plate and third protective plate) in

[0047] Figure 6 The utility model provides the main view structural schematic diagram of frequency converter system (hidden first protective plate, second protective plate and third protective plate) in Figure 1Fig. 1 is a perspective view of a first angle of a frequency converter system (with a cabinet door and a side cabinet panel hidden);

[0048] Figure 7 Fig. 1 is a perspective view of a first angle of a frequency converter system (with a cabinet door and a side cabinet panel hidden); Figure 6 Fig. 1 is a perspective view of a first angle of a frequency converter system (with a cabinet door and a side cabinet panel hidden);

[0049] Figure 8 Fig. 1 is a perspective view of a first angle of a frequency converter system (with a cabinet door and a side cabinet panel hidden); Figure 1 Fig. 1 is a perspective view of a first angle of a frequency converter system (with a cabinet door and a side cabinet panel hidden);

[0050] Figure 9 Fig. 1 is a perspective view of a first angle of a frequency converter system (with a cabinet door and a side cabinet panel hidden); Figure 1 Fig. 1 is a perspective view of a first angle of a frequency converter system (with a cabinet door and a side cabinet panel hidden);

[0051] Figure 10 Fig. 1 is a perspective view of a first angle of a frequency converter system (with a cabinet door and a side cabinet panel hidden); Figure 1 Fig. 1 is a perspective view of a first angle of a frequency converter system (with a cabinet door and a side cabinet panel hidden);

[0052] Figure 11 Fig. 1 is a perspective view of a first angle of a frequency converter system (with a cabinet door and a side cabinet panel hidden); Figure 10 Fig. 1 is a perspective view of a first angle of a frequency converter system (with a cabinet door and a side cabinet panel hidden);

[0053] Figure 12 Fig. 1 is a perspective view of a first angle of a frequency converter system (with a cabinet door and a side cabinet panel hidden); Figure 1 Fig. 1 is a perspective view of a first angle of a frequency converter system (with a cabinet door and a side cabinet panel hidden);

[0054] Figure 13 Fig. 1 is a perspective view of a first angle of a frequency converter system (with a cabinet door and a side cabinet panel hidden); Figure 1 Fig. 1 is a perspective view of a first angle of a frequency converter system (with a cabinet door and a side cabinet panel hidden);

[0055] BRIEF DESCRIPTION OF THE DRAWINGS

[0056] 100, power distribution structure; 1, cabinet shell; 11, first wire hole; 12, front air inlet of cabinet; 13, rear air inlet of cabinet; 2, installation partition; 21, power distribution unit partition; 211, first power distribution partition; 212, second power distribution partition; 213, maintenance area; 22, frequency conversion partition; 221, first frequency conversion unit partition; 222, second frequency conversion unit partition; 223, end frequency conversion unit partition; 224, middle frequency conversion unit partition; 3, control unit; 31, module shell; 32, control circuit board; 4, power connection unit; 41, power connection structure; 411, wiring switch; 412, incoming terminal; 413, outgoing terminal; 414, fuse; 42, power outlet structure; 421, power outlet connector; 422, first power consumption wiring structure; 43, emergency stop button; 44, power indicator; 51, first protective plate; 52, second protective plate; 53, third protective plate; 61, first wiring groove; 62, second wiring groove; 7, grounding structure; 8, second power consumption wiring structure; 9, DC positive and negative bus parallel structure; 10, reserved brake wire; 20, installation guide rail; 30, frequency converter push-in tool; 301, tool plate; 3011, sliding groove; 40, base; 401, forklift hole; 50, hoisting beam; 501, hoisting connection hole; 60, air guide cavity; 601, cavity air outlet; 602, cavity air inlet; 70, operation handle; 80, air outlet cover;

[0057] 1000, frequency converter system; 200, frequency converter; 201, output reactance; 300, power consumption load.

[0058] The implementation function, characteristics and advantages of the utility model will be further described in combination with embodiments and with reference to the drawings. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0060] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications also change accordingly.

[0061] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one feature. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary technical personnel, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0062] The frequency converter is commonly used to drive the electric load such as motor, the frequency converter adjusts the motor speed by changing the power frequency supplied to the motor, the frequency converter is commonly installed in the cabinet, and then the output end of the frequency converter in the cabinet is connected to the motor. In some application occasions, one electric load is driven by multiple frequency converters, due to the increase of control equipment, the arrangement of each unit in the cabinet is unreasonable, the wiring of incoming line and outgoing line is very inconvenient, and the user experience is affected.

[0063] Therefore, the utility model provides a frequency converter system, the frequency converter system includes an optimized power distribution structure, increases the convenience of application of equipment, improves the user experience, wherein, Figures 1 to 13 The frequency converter system provided by the utility model is shown in the structure diagram.

[0064] Please refer to Figure 1 , Figure 5 and Figure 13 , the utility model provides a power distribution structure 100 of frequency converter system, the power distribution structure 100 of frequency converter system includes cabinet shell 1, is equipped with circuit structure in the cabinet shell 1, is used to carry out power distribution to the frequency converter 200 in the cabinet shell 1, when the frequency converter 200 is installed into the cabinet shell 1, need to carry out the connection of strong current, such as, 380V or 220V etc. standard voltage of national standard, of course, it can also be other national standard voltage etc.;It is also necessary to carry out the connection of weak current, such as, control circuit and the like, realize the control of the frequency converter 200, commonly have 12V or 24V etc., of course, it can also be other standard low voltage etc.

[0065] Specifically, in some embodiments, the power distribution structure 100 of the frequency converter system includes a cabinet shell 1, a control unit 3 and a power connection unit 4.

[0066] A plurality of installation partitions 2 distributed along the horizontal direction are formed in the cabinet shell 1, and the plurality of installation partitions 2 include a power distribution unit partition 21 and a frequency conversion partition 22, the frequency conversion partition 22 includes a plurality of frequency conversion unit partitions, and each frequency conversion unit partition is used for installing a frequency converter 200.

[0067] The control unit 3 is arranged in the power distribution unit partition 21, and is electrically connected with external control lines and the frequency converter 200 arranged in each frequency conversion unit partition.

[0068] The power connection unit 4 comprises a power access structure 41 and a power outlet structure 42, the power access structure 41 is arranged in the power distribution unit partition 21 and is arranged apart from the control unit 3, and is electrically connected with external power supply lines and the frequency converter 200 arranged in each frequency conversion unit partition, and the power outlet structure 42 is arranged in the frequency conversion partition 22, and is electrically connected with the frequency converter 200 arranged in each frequency conversion unit partition and external power consumption load 300.

[0069] In the technical scheme of the utility model, the power distribution unit partition 21 and the frequency conversion partition 22 are formed in the cabinet shell 1, the control unit 3 and the power access structure 41 are arranged in the power distribution unit partition 21 and are arranged apart from each other, the frequency converter 200 and the power outlet structure 42 are arranged in the frequency conversion partition 22, the reasonable partition and arrangement of each unit structure in the cabinet shell 1 are realized, the incoming line (strong current line and weak current line) only needs to be operated in the power distribution unit partition 21, and the outgoing line (strong current line) only needs to be operated in the frequency conversion partition 22, the convenience of application of the equipment is increased, and the user experience is improved.

[0070] In some embodiments, referring to Figure 5 And Figure 13 The control unit 3 is further electrically connected with an emergency stop button 43 and a power supply indicator 44, so that the user can operate the control unit 3 quickly in the physical structure. The above-mentioned structures are arranged on the cabinet door of the cabinet shell 1, and are convenient for the user to observe and operate.

[0071] In the utility model, the user is taken as the direction reference, the forward direction is the direction towards the user, or the side of the cabinet shell 1 provided with the cabinet door, and the backward direction is the direction opposite to the forward direction, specifically the direction away from the user, and the up-down direction is the direction taking the gravity as the reference.

[0072] It should be noted that a plurality of installation partitions 2 distributed along the horizontal direction (the left-right direction can be considered as the user reference) are formed in the cabinet shell 11, that is, a whole cabinet shell 1 frame, and a plurality of partitions are orderly arranged in the frame, so that different components can be arranged in each partition.

[0073] The plurality of installation partitions 2 include a variable frequency unit partition, a frequency converter 200 is arranged in the variable frequency unit partition, and an external power load 300 is connected through the frequency converter 200, so that the power load 300 can be well controlled to act, and common power loads 300 are, for example, motors and the like.

[0074] The variable frequency unit partition can be provided in a plurality, such as two, three or more, and when the variable frequency unit partition is provided in a number of at least two or more, the frequency converter 200 is also provided in a number of at least two or more, so that more power loads 300 can be controlled respectively. Of course, in some embodiments, a plurality of frequency converters 200 can also control one power load 300, for example, two frequency converters 200 control one motor, or three frequency converters 200 control one motor, and the like, and the above frequency converters 200 are parallel units to achieve common control of one power load 300.

[0075] One frequency converter 200 is arranged in one variable frequency unit partition, and each frequency converter 200 is independently arranged in the cabinet shell 1, so as to facilitate the layout of each wiring structure, increase the convenience of application of the equipment, and improve the user experience.

[0076] In the scheme that a plurality of frequency converters 200 are arranged in the cabinet shell 1 to form parallel output, the variable frequency unit partition is provided in a plurality, and correspondingly, the frequency converter 200 is provided in a plurality, and the above frequency converter 200 is a parallel unit to achieve common control of one power load 300. On the one hand, the plurality of frequency converters 200 are standby for each other, and if one frequency converter 200 fails, the remaining frequency converters 200 can take over the control of the motor, reduce the downtime, and ensure the continuity of control. On the other hand, a plurality of frequency converters 200 can be provided with different control parameter combinations to finely control the motor under different working conditions, so as to improve the operating performance of the motor under complex working conditions.

[0077] In the technical scheme of the utility model, the control unit 3 and the electric access structure 41 are arranged in the power distribution unit partition 21, specifically, the strong current structure is arranged in the power distribution unit partition 21, the strong current wiring of the frequency converter 200 is realized, and the weak current structure is also arranged, and the control of the frequency converter 200 is realized.

[0078] For the layout of the power distribution unit partition 21, the control unit 3 and the electric access structure 41 can be arranged apart in the up-down direction, or in the left-right direction, or in the front-back direction. The specific layout mode also needs to consider the lead-in mode of the lead wire, for example, the lead wire can be led in from the bottom of the cabinet shell 1, or from the side of the cabinet shell 1, etc. In the embodiment in which the lead-in mode is from the bottom of the cabinet shell 1, the strong current structure is considered to be relatively hard and difficult to deform and install, and the layout mode with the strong current structure placed below is often used.

[0079] Specifically, in some embodiments, referring to Figure 5 , the power distribution unit partition 21 includes a first power distribution partition 211 and a second power distribution partition 212 arranged apart in the up-down direction, the control unit 3 is arranged in the first power distribution partition 211, and the electric access structure 41 is arranged in the second power distribution partition 212. In this way, the power distribution unit and the electric access structure 41 are reasonably partitioned, facilitating the wiring operation between them, and also reducing the interference of the strong current line on the control line of the weak current.

[0080] In addition, the electric access structure 41 is basically not replaced and maintained or replaced and maintained at a very low frequency after the access is completed, while the control unit 3 often has some manual operations, such as setting control parameters, forced shutdown, etc. The upper arrangement of the control unit 3 conforms to the ergonomic design and is convenient for user operation.

[0081] It should be noted that the first power distribution partition 211 and the second power distribution partition 212 have no obvious division limit, and can be arranged adjacent to each other, partially overlapped, or spaced apart.

[0082] The control unit 3 is provided with a circuit board, which needs to be protected to reduce the influence of the strong current structure on the circuit board. In some embodiments, referring to Figure 5 and Figure 13 , the control unit 3 includes a module shell 31 and a control circuit board 32 arranged in the module shell 31, the control circuit board 32 is used to electrically connect external control lines and frequency converters 200 arranged in each frequency conversion unit partition, and the control unit 3 independently constitutes a module, which can be installed in the first power distribution unit partition 21 when assembled.

[0083] It should be noted that in the first power distribution unit partition 21 can be connected by some skeleton structure, such as rectangular tube or channel steel and so on to limit a mounting space, the module shell 31 of the control unit 3 is installed into the mounting space can complete the installation. The specific limiting method can be fixed by using a threaded connection structure, such as screw or bolt connection and so on, but also can be fixed by using a buckle connection and so on, but also can be fixed by using a structure of adhesive.

[0084] The control unit 3 is used to electrically connect the external control line and the frequency converter 200 arranged in each of the frequency conversion unit partitions. First, the external incoming line is introduced to the control unit 3, and then the control line at the control unit 3 is led out to the frequency converter 200 in each of the frequency conversion unit partitions, so as to electrically connect the control unit 3 and the plurality of frequency converters 200, and further control the plurality of frequency converters 200.

[0085] The control line can be directly arranged in the power distribution unit partition 21. Considering that the number of control lines is large, the line slot limiting installation method can be used to facilitate the management of the control lines.

[0086] In some embodiments, referring to Figure 4 , Figure 6 and Figure 7 , a first wire slot 61 extending longitudinally is arranged in the power distribution unit partition 21. One end of the first wire slot 61 corresponds to the bottom wall of the cabinet shell 1 and is used to access the external control line, and the other end corresponds to the control unit 3, that is, the control line is limited in the first wire slot 61 through the first wire slot 61, which facilitates the reasonable layout of the line, the appearance is neat, and the subsequent maintenance is also facilitated.

[0087] It can be understood that the first wire slot 61 forms a certain accommodation space, which mainly limits the wire path of the control line, so that the control line with soft texture can be well received and managed. During installation, the base 40 of the first wire slot 61 is fixed in the power distribution unit partition 21, and after the control lines are classified and arranged well and put into the first wire slot 61, the cover of the first wire slot 61 is covered, thereby completely limiting the control line. Of course, in some occasions, in order to prevent the cover and the base 40 of the first wire slot 61 from separating, a segmented buckle can also be used to fix and limit.

[0088] The base 40 of the first wire slot 61 can be fixed to the mounting skeleton of the cabinet shell 1 by using a threaded connection structure, such as a screw or a bolt connection and the like, or by using a buckle connection and the like, or by using a structure of adhesive.

[0089] The one end of the first wiring groove 61 corresponds to the control unit 3, and a module wiring hole is arranged on the module shell 31 of the control unit 3. The control line in the first wiring groove 61 passes through the module wiring hole and enters the module shell 31, so as to introduce the wiring of the control unit 3.

[0090] It can be understood that when the module wiring hole is arranged on the side of the cabinet shell 1 away from the frequency conversion unit partition, the first wiring groove 61 also needs to be arranged on the side of the cabinet shell 1 away from the frequency conversion unit partition, so as to facilitate wiring and reduce the length directly exposed in the power distribution unit partition 21.

[0091] The other end of the first wiring groove 61 corresponds to the bottom wall of the cabinet shell 1, and is used to access external control lines, that is, the control line directly introduced into the first wiring groove 61 from the outside, so as to facilitate wiring and reduce the length directly exposed in the power distribution unit partition 21.

[0092] In some embodiments, the plurality of frequency conversion unit partitions includes an end frequency conversion unit partition 223 at the end of the cabinet shell 1, and at least one intermediate frequency conversion unit partition 224 between the end frequency conversion unit partition 223 and the power distribution unit partition 21.

[0093] Please refer to Figure 6 and Figure 7 A second wiring groove 62 is arranged in the frequency conversion partition 22, one end of the second wiring groove 62 corresponds to the control unit 3, and the other end passes through at least one intermediate frequency conversion unit partition 224 and corresponds to the end frequency conversion unit partition 223.

[0094] That is, the control line is limited in the second wiring groove 62 through the second wiring groove 62, which facilitates reasonable layout of the line, keeps the appearance neat, and also facilitates subsequent maintenance.

[0095] It can be understood that a certain accommodation space is formed in the second wiring groove 62, mainly to limit the wiring path of the control line, so that the control line with soft texture can also be well received and managed. During installation, the base 40 of the second wiring groove 62 is fixed in the frequency conversion unit partition, and after the control line is completely classified and arranged in the second wiring groove 62, the cover of the second wiring groove 62 is covered, so as to completely limit the control line. Of course, in some occasions, in order to prevent the cover and the base 40 of the second wiring groove 62 from being separated, a segmented fixing band can also be arranged to achieve fixing and limiting.

[0096] The base 40 of the second wiring groove 62 can be fixed to the mounting frame of the cabinet shell 1 by screw connection structure, such as screw or bolt connection, or buckle connection, or structural adhesive.

[0097] One end of the second wiring groove 62 corresponds to the control unit 3, and a module outlet hole is formed in the module shell 31 of the control unit 3. The control line in the module shell 31 of the control unit 3 passes through the module outlet hole to the outside of the module shell 31, and the control line in the second wiring groove 62 is wired to the intermediate frequency conversion unit partition 224 and the end frequency conversion unit partition 223 to control the frequency converter 200 in the intermediate frequency conversion unit partition 224 and the end frequency conversion unit partition 223.

[0098] It can be understood that when the frequency conversion unit partition is provided with only two, the intermediate frequency conversion unit partition 224 is provided with only one, and the end frequency conversion unit partition 223 is provided with only one. In this embodiment, the second wiring groove 62 can be provided only in the intermediate frequency conversion unit partition 224, and some slot through holes are formed in the bottom of the second wiring groove 62. Some control lines can be introduced into the intermediate frequency conversion unit partition 224 to realize electrical connection of the frequency converter 200 in the intermediate frequency conversion unit partition 224. In addition, a partition through hole is formed in the partition between the intermediate frequency conversion unit partition 224 and the end frequency conversion unit partition 223. The control line from the second wiring groove 62 can pass through the partition through hole to the end frequency conversion unit partition 223 to realize electrical connection of the frequency converter 200 in the end frequency conversion unit partition 223.

[0099] For the case where a plurality of intermediate frequency conversion unit partitions 224 are provided, such as two, three or more, the second wiring groove 62 needs to pass through a plurality of frequency conversion unit partitions, and slot through holes are formed in each intermediate frequency conversion unit partition 224 to realize electrical connection of the frequency converter 200 in each intermediate frequency conversion unit partition 224.

[0100] The electrical access structure 41 is used to electrically connect the external power supply line and the frequency converter 200 in each frequency conversion unit partition. It is mainly to introduce external strong current into the power distribution unit partition 21. In some embodiments, please refer to Figure 5 and Figure 7The electrical access structure 41 includes a wiring switch 411, a line terminal 412, a lead-out terminal 413, and a plurality of fuses 414. The wiring switch 411 has a switch input end and a switch output end. The line terminal 412 is electrically connected to the switch input end for external power supply line access. One end of the lead-out terminal 413 is electrically connected to the switch output end. The plurality of fuses 414 are electrically connected to a plurality of conductive connectors on the other end of the lead-out terminal 413, and are used to electrically connect the frequency converter 200 arranged in each frequency conversion unit sub-area. The on-off connection between the line terminal 412 and the lead-out terminal 413 is realized through the wiring switch 411, which improves the electrical safety performance.

[0101] In some embodiments, an operating handle 70 is arranged at the wiring switch 411, through which the on-off of the circuit can be quickly realized.

[0102] It can be understood that for the frequency converter system 1000, the common RST three-phase input and UVW three-phase output, the wiring switch 411 can realize the simultaneous connection or simultaneous disconnection of the RST three-phase. The line terminal 412 and the lead-out terminal 413 are both arranged as conductive rows, such as copper rows, which have excellent conductive performance.

[0103] In order to improve electrical safety, in some embodiments, a plurality of fuses 414 are arranged in the electrical access structure 41. The fuses 414 are used to automatically cut off the power supply when an overload or short circuit occurs in the circuit, thereby protecting the circuit and equipment from damage. The working principle of the fuse 414 is to use a fusible metal wire or metal sheet that melts when the current exceeds a predetermined value, thereby disconnecting the circuit to improve the electrical safety performance of the circuit.

[0104] It should be noted that the wiring switch 411 and the lead-out terminal 413 can be fastened by bolt connection to realize electrical connection. The wiring switch 411 and the line terminal 412 can also be fastened by bolt connection to realize electrical connection.

[0105] The position of the fuse 414 is not limited, as long as it is arranged in the power distribution unit sub-area 21. In relation to the wiring switch 411, it can be arranged on the front side, rear side, left side, or right side of the wiring switch 411.

[0106] After the fuse 414 is damaged and needs to be replaced and repaired, the convenience of the maintenance personnel's work also needs to be considered during the maintenance process. In some embodiments, please refer to Figure 5In the power distribution unit subarea 21, a maintenance area 213 is formed, and a plurality of the fuses 414 are arranged corresponding to the maintenance area 213 and can be exposed from the maintenance area 213 for maintenance by an operator. In this way, the maintenance personnel can be more convenient when maintaining the fuses 414.

[0107] In addition, during the entire replacement and maintenance process, the wiring switch 411 needs to be operated to disconnect the entire access circuit to ensure the safety of the maintenance personnel.

[0108] It can be understood that the maintenance area 213 is in the second power distribution subarea 212, and after the cabinet door of the cabinet shell 1 is opened, the maintenance area 213 is exposed to the front of the cabinet shell 1, and the operator can directly observe the fuses 414. In addition, the maintenance area 213 needs to be arranged with a certain size to provide some operation space during the replacement of the fuses 414.

[0109] The incoming terminal 412, the outgoing terminal 413, etc. are exposed in the power distribution unit subarea 21, and when the operating personnel maintain or operate the electrical structure in the power distribution unit subarea 21, there is a certain operation risk.

[0110] In some embodiments, please refer to Figure 4 and Figure 6 A first protective plate 51 is arranged in the power distribution unit subarea 21, and the first protective plate 51 is arranged at least corresponding to the front side of the incoming terminal 412 to shield the incoming terminal 412. When the operating personnel operate, the risk of the user's body part touching the incoming terminal 412 is reduced, and the electrical safety performance is improved.

[0111] The size of the first protective plate 51 is not limited, and the first protective plate 51 can completely cover the incoming terminal 412 or partially cover the incoming terminal 412.

[0112] The first protective plate 51 is made of an insulating material, and can be made of a high-molecular insulating material such as plastic or rubber.

[0113] In addition, in order to facilitate the operating personnel to observe the wiring condition of the incoming terminal 412, such as whether it is loose or not, the material of the first protective plate 51 can also be made of a transparent material.

[0114] The connection mode of the first protective plate 51 in the power distribution unit subarea 21 is not limited, and the first protective plate 51 can be fixedly installed on the mounting frame in the cabinet shell 1 by using a threaded connection structure, such as a screw or bolt connection mode, or can be connected by using a buckle connection mode, or can be fixed by using a structural adhesive.

[0115] In some embodiments, please refer to Figure 4 and Figure 6 A second protective plate 52 is arranged in the power distribution unit partition 21, and the second protective plate 52 is arranged at least on the front side corresponding to the outgoing terminal 413 to shield the outgoing terminal 413, so as to reduce the risk of the user's body part touching the outgoing terminal 413 during operation, and improve the electrical safety performance.

[0116] The size of the second protective plate 52 is not limited, and the second protective plate 52 can completely cover the outgoing terminal 413 or partially cover the outgoing terminal 413.

[0117] The second protective plate 52 is made of an insulating material, and can be made of a high-molecular insulating material such as plastic or rubber.

[0118] In addition, in order to facilitate the operator to observe the wiring condition of the outgoing terminal 413, such as whether it is loose or not, the material of the second protective plate 52 can be made of a transparent material.

[0119] The connection mode of the second protective plate 52 in the power distribution unit partition 21 is not limited, and the second protective plate 52 can be fixedly installed on the mounting frame in the cabinet shell 1 by using a threaded connection structure, such as a screw or bolt connection, or can be connected by using a buckle connection, or can be fixed by using a structural adhesive.

[0120] In addition, it should be noted that the first protective plate 51 and the second protective plate 52 are arranged as close as possible to reduce the gap between the first protective plate 51 and the second protective plate 52.

[0121] In some embodiments, a grounding structure 7 is arranged in the power distribution unit partition 21. On the one hand, the fault current flows into the ground through the grounding device, which protects the human body from electric shock. On the other hand, the grounding structure 7 can be used as a protection means for preventing lightning overvoltage and operating overvoltage. At the same time, during maintenance and other operations, good grounding can prevent static electricity accumulation and avoid damage to personnel and equipment caused by static discharge.

[0122] The grounding structure 7 can be made of a grounding copper sheet or an iron sheet, and can be fixedly installed on the mounting frame in the cabinet shell 1 by using a threaded connection structure, such as a screw or bolt connection, or can be connected by using a buckle connection, or can be fixed by using a structural adhesive.

[0123] In some embodiments, please refer to Figure 10A plurality of first wire passing holes 11 are arranged on the bottom wall of the power distribution unit section 21 of the cabinet housing 1, through which the control lines and the strong current lines are introduced into the power distribution unit section 21.

[0124] The number and size of the first wire passing holes 11 are not limited, and some of the first wire passing holes 11 can have a smaller aperture for the control lines to pass through, and some of the first wire passing holes 11 can have a larger aperture for the strong current lines to pass through.

[0125] Some dustproof or waterproof structures, such as rubber plugs, can be arranged at the first wire passing holes 11 to reduce the risk of dust or water entering the power distribution unit section 21.

[0126] The electrical outlet structure 42 is used to electrically connect the frequency converters 200 arranged in each of the frequency conversion unit sections and the external electrical load 300, and is arranged in the frequency conversion section 22. It can be understood that the electrical outlet structure 42 can be arranged in one of the frequency conversion unit sections, or can span several frequency conversion unit sections.

[0127] In some embodiments, referring to Figure 5 , Figure 7 and Figure 12 , the electrical outlet structure 42 includes a plurality of outlet connectors 421 and a first electrical load wiring structure 422. The plurality of outlet connectors 421 are arranged in the frequency conversion section 22, and the first electrical load wiring structure 422 is used to electrically connect the plurality of outlet connectors 421 and the output connectors of the frequency converters 200 arranged in each of the frequency conversion unit sections, respectively. The first electrical load wiring structure 422 outputs the output electrical parameters in each of the frequency converters 200 to the plurality of outlet connectors 421, and connects the plurality of outlet connectors 421 to the electrical load 300, thereby achieving control of the electrical load 300.

[0128] It can be understood that the plurality of outlet connectors 421 are terminal blocks arranged in the frequency conversion section 22, which can be fixedly installed on the mounting frame in the cabinet housing 1 by screw connection structure, such as screw or bolt connection, or by buckle connection, or by structural adhesive.

[0129] Generally, the connection between the external load and the terminal block can be achieved by bolt connection. Specifically, a plurality of connection holes are arranged on the terminal block, and the diameters of the plurality of connection holes can be partially the same or partially different. The wires of the external electrical load 300 are fastened by connection bolts.

[0130] The outgoing joint 421 is exposed in the variable frequency partition 22, and there is a certain operation risk when the operating personnel overhauls or operates the electrical structure in the variable frequency partition 22.

[0131] In some embodiments, referring to Figure 4 and Figure 6 , a third protective plate 53 is arranged in the variable frequency partition 22, and the third protective plate 53 is arranged at least corresponding to the front side of the plurality of outgoing joints 421. The third protective plate 53 shields the outgoing joint 421, and when the operating personnel operates, the risk of the user's body part touching the outgoing joint 421 is reduced, and the electrical safety performance is improved.

[0132] The size of the third protective plate 53 is not limited, and the third protective plate 53 can completely cover the outgoing joint 421 or partially cover the outgoing joint 421.

[0133] The third protective plate 53 is made of insulating material, and can be made of high molecular insulating material such as plastic or rubber.

[0134] In addition, in order to facilitate the operating personnel to observe the wiring condition of the outgoing joint 421, such as whether it is loose, the material of the third protective plate 53 can also be set as transparent material.

[0135] The connection mode of the third protective plate 53 in the variable frequency partition 22 is not limited, and the third protective plate 53 can be fixedly installed on the mounting frame in the cabinet shell 1 by using a threaded connection structure, such as a screw or bolt connection mode, or can be connected by using a buckle connection mode, or can be connected by using a structural adhesive.

[0136] The strong electricity introduced by the electrical access structure 41 needs to be introduced to each variable frequency converter 200. In some embodiments, the power access unit 4 further comprises a second power wiring structure 8 arranged in the cabinet shell 1. The second power wiring structure 8 is arranged one by one corresponding to the variable frequency converter 200 arranged in each variable frequency unit partition. One end of the second power wiring structure 8 is electrically connected to the electrical access structure 41, and the other end is used to electrically connect the variable frequency converter 200 arranged in the corresponding variable frequency unit partition. By arranging the second power wiring structure 8 in the cabinet shell 1, the electrical connection between the electrical access structure 41 and the variable frequency converter 200 is facilitated.

[0137] It should be noted that the second power wiring structure 8 is mainly some conductive rows, such as copper rows. The conductive rows can be arranged in advance in the cabinet shell 1. After the variable frequency converter 200 is arranged in the variable frequency partition 22, the conductive rows and the variable frequency converter 200 are directly electrically connected.

[0138] In the cabinet, the conductive row needs to cross the power distribution unit partition 21 and each variable frequency unit partition, and the running path of the conductive row is at least partially in a curved shape, which can be achieved by locally bending the conductive row or by connecting multiple conductive rows in series.

[0139] In order not to affect the installation of the frequency converter 200, the second power supply line structure 8 needs to be reasonably arranged. In some embodiments, referring to Figures 7 to 9 , the second power supply line structure 8 is at least partially arranged on the back of the cabinet 1, and when the frequency converter 200 is introduced into the cabinet 1 from the front side of the cabinet 1, the second power supply line structure 8 does not interfere with the frequency converter 200, and the arrangement is reasonable.

[0140] In embodiments in which multiple variable frequency unit partitions exist, the length of the conductive row arranged away from the power distribution unit partition 21 needs to be longer, and it is necessary to pass through the variable frequency unit partition close to the power distribution unit partition 21. Multiple conductive rows need to be reasonably arranged in the variable frequency unit partition close to the power distribution unit partition 21.

[0141] In some embodiments, two adjacent variable frequency unit partitions include a first variable frequency unit partition 221 close to the power distribution unit partition 21 and a second variable frequency unit partition 222 away from the first variable frequency unit partition 221. The second power supply line structure 8 on the second variable frequency unit partition 222 is at least partially behind the second power supply line structure 8 on the first variable frequency unit partition 221. By arranging front and back, on the one hand, the interference with the installation of the frequency converter 200 is reduced, and on the other hand, the space is reasonably utilized, which has a good effect.

[0142] It should be noted that when only two variable frequency unit partitions are arranged, the aforementioned intermediate variable frequency unit partition 224 is the first variable frequency unit partition 221, and the aforementioned end variable frequency partition 22 is the second variable frequency unit partition 222.

[0143] In some embodiments, referring to Figure 9 and Figure 13 , a DC positive and negative bus parallel structure 9 is further arranged in the variable frequency partition 22 to electrically connect the frequency converters 200 arranged in the adjacent two variable frequency unit partitions.

[0144] On the one hand, when the load requirements of the two frequency converters 200 are unbalanced, power sharing can be achieved through the parallel connection of the positive and negative DC buses. If one of the frequency converters 200 fails (such as a power module is damaged or the control circuit fails), the other frequency converter 200 can provide temporary energy support for the load connected to the failed frequency converter 200 through the parallel DC bus, which can reduce the production line downtime caused by the failure of the frequency converter 200 and improve the reliability and stability of the system. On the other hand, after the two frequency converters 200 are connected in parallel through the DC bus, the impact on the power grid during startup and shutdown can be buffered to some extent.

[0145] In the frequency conversion partition 22, the positive and negative DC bus parallel connection structure 9 is arranged on the top of the cabinet shell 1 and spans multiple frequency conversion unit partitions.

[0146] In some embodiments, referring to Figure 12 In the frequency conversion partition 22, a reserved braking line 10 is also provided for electrically connecting the frequency converters 200 arranged in each frequency conversion unit partition and an external braking unit.

[0147] The reserved braking line 10 of the frequency converter 200 is mainly used to connect an external braking unit or braking resistor. During rapid deceleration or shutdown of the motor, the motor is in a regenerative power generation state, which will generate feedback power. This part of energy may cause the DC bus voltage to be too high and damage the frequency converter 200. By connecting the braking unit and the braking resistor through the braking line, this part of energy can be consumed in the form of heat, achieving rapid and safe braking of the motor.

[0148] After the installation of the frequency converter 200 is completed, the external braking unit or braking resistor can be connected.

[0149] The cabinet shell 1 is a large structural member with a very large weight, and auxiliary hoisting or carrying equipment is required for transportation and installation.

[0150] In some embodiments, referring to Figure 1 A base 40 is arranged on the outer bottom wall of the cabinet shell 1, and a forklift hole 401 is formed in the base 40 for insertion of the fork arms of a forklift. In this way, by extending the fork arms of the forklift into the insertion hole of the base 40, the cabinet shell 1 can be held, facilitating the installation of the cabinet shell 1 in different locations.

[0151] It can be understood that the base 40 arranged at the bottom of the cabinet shell 1 can be a skeleton spliced together, such as a rectangular tube, a square tube, etc. Generally, at least two forklift holes 401 are arranged on the base 40 for insertion of the two fork arms of the forklift. Of course, a larger number of forklift holes 401 can also be arranged to facilitate the adjustment of the position of the forklift inserted into the base 40.

[0152] In some special occasions, the forklift cannot reach or the installation position has a large height, the lifting method can be used for installation, in particular, please refer to Figures 1 to 3 , the outer top wall of the cabinet shell 1 is provided with a lifting beam 50, and the lifting beam 50 is provided with a lifting connection hole 501. The lifting device can be connected to the lifting connection hole 501, and the lifting of the cabinet shell 1 is realized.

[0153] The lifting connection hole 501 can be provided with a plurality of lifting connection holes 501, and the plurality of lifting connection holes 501 are arranged along the length direction of the lifting beam.

[0154] The volume of the frequency converter 200 is relatively large, and some tools are needed for installation. In some embodiments, please refer to Figure 10 and Figure 11 , the power distribution structure 100 of the frequency converter system further includes a frequency converter pushing tool 30, the frequency converter pushing tool 30 includes a tool plate 301, two parallel sliding grooves 3011 are formed on the tool plate 301, one end of the tool plate 301 can be lapped on the inner bottom wall of the frequency converter unit partition, and the other end is used to abut on the ground, so as to tilt the frequency converter 200 upward and push it into the frequency converter unit partition. In this way, the user can conveniently install the frequency converter 200.

[0155] It can be understood that the frequency converter 200 is provided with a roller below the shell, which is convenient for pushing the frequency converter 200 by rolling. In addition, during the pushing process of the frequency converter 200, the roller can be limited in the sliding groove 3011 for sliding, so as to realize the rapid installation of the frequency converter 200.

[0156] After the frequency converter 200 enters the cabinet shell 1, it also needs to slide backward to completely enter the frequency converter unit partition. In some embodiments, please refer to Figure 10 , the inner bottom wall of the cabinet shell 1 is provided with an installation guide rail 20, which is used for limiting the sliding of the frequency converter 200. In this way, the shaking of the frequency converter 200 during installation is reduced.

[0157] During the use of the frequency converter 200, heat and hot air flow will be generated in the cabinet, and the hot air flow needs to be discharged outward. In some prior art, a separate fan is usually arranged at the top of the cabinet to form negative pressure at the air outlet of the cabinet, so as to forcibly discharge air. In this way, the energy consumption is increased, and part of the hot air flow still flows back, affecting the work of the electrical elements in the cabinet.

[0158] In some embodiments, please refer to Figures 5 to 7At the top of the variable frequency unit partition, a wind guide cavity 60 is defined, which is provided with a cavity air outlet 601 and a cavity air inlet 602, the cavity air inlet 602 is used to guide the air flow out of the frequency converter 200 provided in the variable frequency unit partition, and the cavity air outlet 601 is used to guide the air flow in the wind guide cavity 60 out of the cabinet shell 1.

[0159] At the top of the variable frequency unit partition, a wind guide cavity 60 is defined, which is provided with a cavity air outlet 601 and a cavity air inlet 602, the cavity air inlet 602 is used to guide the air flow out of the frequency converter 200 provided in the variable frequency unit partition, and the cavity air outlet 601 is used to guide the air flow in the wind guide cavity 60 out of the cabinet shell 1, through the wind guide cavity 60, the hot air flow in the frequency converter 200 is directly guided out of the cabinet shell 1, without additional fan outside the cabinet shell 1, reducing energy consumption, reducing the backflow of air flow in the cabinet, and improving the working environment of electrical elements in the cabinet.

[0160] It can be a separate wind guide shell provided in the cabinet shell 1, the wind guide cavity 60 is formed in the wind guide shell, and there is no any correlation between the cavity wall of the wind guide cavity 60 and the cabinet wall of the cabinet shell 1, or some flow guide plates are provided, the cavity wall of the wind guide cavity 60 includes the flow guide plates and part of the cabinet wall of the cabinet shell 1.

[0161] Please refer to Figures 5 to 7 At the cavity air outlet 601, a wind guide cover 80 is provided, through the wind guide effect of the wind guide cover 80, the upwardly arranged cavity air outlet 601 can be horizontally and laterally air out, thereby realizing the functions of dust prevention and rainwater prevention.

[0162] In some embodiments, please refer to Figure 5 and Figure 13 In the frequency converter air duct, an output reactance 201 is further provided, through which the electrical equipment is connected, and the control performance of the electrical equipment is further optimized.

[0163] In some embodiments, please refer to Figures 1 to 3 On the front side door of the cabinet shell 1, a front air inlet 12 is provided, and on the back of the cabinet shell 1, a rear air inlet 13 is provided, through the front and rear air inlets of the cabinet shell 1, cold air flow can be quickly guided into the cabinet shell 1.

[0164] The utility model discloses still a kind of frequency converter system 1000, the frequency converter system 1000 including the power distribution structure 100 of frequency converter system, the frequency converter system 1000 including all technical features in above-mentioned technical solutions, also have the technical effect brought by above-mentioned all technical features, here no longer one by one elaboration.In multiple the frequency conversion unit subarea each be equipped with one frequency converter 200, each frequency converter 200 is electrically connected to the electric access structure 41, the electric outlet structure 42 and the control unit 3.

[0165] The above is only optional embodiment of the utility model, and does not limit the patent range of the utility model, and equivalent structure transformation made in the concept of the utility model, using the utility model specification and attached drawing contents, or direct / indirect application in other related technical fields are included in the patent protection range of the utility model.

Claims

1. A frequency converter system, characterized by The utility model relates to a cabinet, and particularly relates to a cabinet with a plurality of variable frequency units. The cabinet comprises: a cabinet housing, a plurality of installation sub-zones distributed in a horizontal direction are formed in the cabinet housing, the plurality of installation sub-zones comprise a power distribution unit sub-zone and a variable frequency sub-zone, the variable frequency sub-zone comprises a plurality of variable frequency unit sub-zones; a control unit arranged in the power distribution unit sub-zone and electrically connected to an external control line; an electricity connection unit comprising an electricity access structure and an electricity exit structure, the electricity access structure is arranged in the power distribution unit sub-zone and is spaced apart from the control unit to electrically connect to an external power supply line, and the electricity exit structure is arranged in the variable frequency sub-zone to electrically connect to an external power load; and 2. The frequency converter system of claim 1, wherein, a plurality of frequency converters arranged in the plurality of variable frequency unit sub-zones, each of the frequency converters is electrically connected to the electricity access structure, the electricity exit structure and the control unit. The power distribution unit sub-zone comprises a first power distribution sub-zone and a second power distribution sub-zone arranged in a vertical direction; 3. The frequency converter system of claim 1, wherein, the control unit is arranged in the first power distribution sub-zone, and the electricity access structure is arranged in the second power distribution sub-zone.

4. The frequency converter system of claim 1, wherein, The control unit comprises a module housing and a control circuit board arranged in the module housing, the control circuit board is electrically connected to the external control line and each of the frequency converters. The electricity access structure comprises: a wiring switch having a switch input end and a switch output end; a line inlet terminal electrically connected to the switch input end to connect the external power supply line; a line outlet terminal having one end electrically connected to the switch output end; and 5. The frequency converter system of claim 4, wherein, a plurality of fuses electrically connected to a plurality of conductive terminals of the other end of the line outlet terminal and electrically connected to each of the frequency converters.

6. The frequency converter system of claim 4, wherein, An inspection area is formed in the power distribution unit sub-zone, the plurality of fuses are arranged corresponding to the inspection area and can be exposed from the inspection area to be inspected by an operator. A first protective plate is arranged in the power distribution unit sub-zone, the first protective plate is arranged corresponding to at least a front side of the line inlet terminal; and / or 7. The frequency converter system of claim 1, wherein, a second protective plate is arranged in the power distribution unit sub-zone, the second protective plate is arranged corresponding to at least a front side of the line outlet terminal. A first wiring groove extending in a longitudinal direction is arranged in the power distribution unit sub-zone, one end of the first wiring groove is arranged corresponding to a bottom wall of the cabinet housing to connect the external control line, and the other end is arranged corresponding to the control unit; and / or a grounding structure is arranged in the power distribution unit sub-zone; and / or 8. The frequency converter system of claim 1, wherein, a plurality of first wire holes are arranged on the bottom wall of the power distribution unit sub-zone of the cabinet housing. The electricity exit structure comprises: a plurality of exit terminals arranged in the variable frequency sub-zone; and 9. The frequency converter system of claim 8, wherein, a first power wiring structure electrically connected to a plurality of output terminals of each of the frequency converters and the plurality of exit terminals, respectively.

10. The frequency converter system of claim 1, wherein, A third protective plate is arranged in the variable frequency sub-zone, the third protective plate is arranged corresponding to at least a front side of the plurality of exit terminals.

11. The frequency converter system of claim 10, wherein, The electricity connection unit further comprises a second power wiring structure arranged in the cabinet housing, the second power wiring structure is arranged corresponding to each of the frequency converters, one end of the second power wiring structure is electrically connected to the electricity access structure, and the other end is electrically connected to the corresponding frequency converter. The second power wiring structure is at least partially arranged on a back of the cabinet housing; and / or Two adjacent variable frequency unit sub-zones include a first variable frequency unit sub-zone close to the power distribution unit sub-zone, and a second variable frequency unit sub-zone away from the first variable frequency unit sub-zone, and a second power consumption wiring structure on the second variable frequency unit sub-zone is at least partially behind a second power consumption wiring structure on the first variable frequency unit sub-zone.

12. The frequency converter system of claim 1, wherein, The plurality of variable frequency unit sub-zones include an end variable frequency unit sub-zone at an end of the cabinet shell, and at least one intermediate variable frequency unit sub-zone between the end variable frequency unit sub-zone and the power distribution unit sub-zone. A second wiring groove is arranged horizontally in the variable frequency sub-zone, one end of the second wiring groove corresponds to the control unit, and the other end passes through at least one intermediate variable frequency unit sub-zone and corresponds to the end variable frequency unit sub-zone.

13. The frequency converter system of claim 1, wherein, The variable frequency sub-zone also has a DC positive and negative bus parallel structure, the DC positive and negative bus parallel structure is electrically connected to the frequency converters arranged in the adjacent two variable frequency unit sub-zones; and / or, A reserved braking line is arranged in the variable frequency sub-zone, so that each frequency converter is electrically connected to an external braking unit.

14. The frequency converter system of claim 1, wherein, An installation guide rail is arranged on the inner bottom wall of the cabinet shell, and the frequency converter is limited to slide in; and / or, The frequency converter system also includes a frequency converter pushing tool, the frequency converter pushing tool includes a tool plate, two parallel sliding grooves are formed on the tool plate, one end of the tool plate can be lapped on the inner bottom wall of the variable frequency unit sub-zone, and the other end is used to abut on the ground, and the frequency converter can be pushed into the variable frequency unit sub-zone obliquely upward.

15. The frequency converter system of claim 1, wherein, A base is arranged on the outer bottom wall of the cabinet shell, a forklift hole is formed on the base, and the fork arm of the forklift is inserted; and / or, A lifting beam is arranged on the outer top wall of the cabinet shell, and a hoisting connection hole is arranged on the lifting beam.

16. The frequency converter system of claim 1, wherein, An air guide cavity is defined at the top of the variable frequency unit sub-zone; The air guide cavity is provided with a cavity air outlet and a cavity air inlet, the cavity air inlet is used to guide the airflow out of the frequency converter, and the cavity air outlet is used to guide the airflow in the air guide cavity out of the cabinet shell.

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