Box body and frequency converter
By setting a flipped mounting plate structure in the inverter box, the problem of fastener drop is solved, and the safety of fastener and the convenience of disassembly and assembly are achieved.
Patent Information
- Application Number
- CN202422013196.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-19
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-08-19
AI Technical Summary
In existing inverters, fasteners are very likely to fall to the bottom of the box, difficult to remove, there are safety hazards and difficulty in disassembling and assembly.
The first mounting plate, the second mounting plate and the third mounting plate are sequentially connected in the direction of the housing, and bent along both sides of the housing to form flanges to fit the inner wall of the housing, eliminate the gap between the mounting assembly and the housing, and prevent the fastener from falling.
Effectively avoid fasteners and other small components falling to the bottom of the shell, reducing the difficulty of disassembly and assembly, and improving safety and convenience.
Smart Images
Figure CN223157353U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of frequency converters, in particular to a box body and a frequency converter. Background Art
[0002] In modern industrial production, as an important electrical control device, the frequency converter is widely used in various occasions and can achieve precise control of parameters such as the speed and torque of the motor. However, during the disassembly and assembly of the frequency converter, fasteners such as bolts are extremely likely to fall to the bottom of the box body, and it is difficult to take them out after they fall to the bottom of the box body.
[0003] Therefore, it is necessary to provide a new box body and frequency converter to solve the above technical problems. Summary of the Utility Model
[0004] The main purpose of the utility model is to provide a box body and a frequency converter, aiming to solve the technical problem that in the existing frequency converter, fasteners are extremely likely to fall to the bottom of the box body.
[0005] To achieve the above purpose, a box body proposed by the utility model includes:
[0006] A housing;
[0007] An installation component, the installation component includes a first installation plate, a second installation plate and a third installation plate connected in sequence along a first direction of the housing, the first installation plate and the third installation plate are respectively connected to two inner walls of the housing opposite to each other along the first direction thereof; and first flanges are formed on both sides of the first installation plate, the second installation plate and the third installation plate along a second direction of the housing, and the first flanges extend along a third direction of the housing and are attached to the inner wall of the housing.
[0008] In an embodiment, the second installation plate includes an installation portion, a connection portion and a protection portion connected in sequence along the second direction of the housing, and the installation portion and the protection portion are spaced apart along the third direction of the housing, the protection portion forms the first flange, and the first flange formed by the protection portion is connected to the housing.
[0009] In an embodiment, the protection portion forms an extension plate, and the extension plate is connected to the first installation plate.
[0010] In an embodiment, the protection portion and the connection portion enclose a receiving space, and the protection portion forms a protection plate for shielding the receiving space.
[0011] In one embodiment, the box body further includes an insulating board and insulating sheets. The insulating board is disposed at the overlapping portion of the first mounting board and the second mounting board, and the insulating sheets are disposed at the overlapping portion of the second mounting board and the third mounting board.
[0012] In one embodiment, the second mounting board is provided with a wiring terminal, and the third mounting board is provided with a connection terminal. One side of the insulating board is connected to the first mounting board, and the other side abuts against the wiring terminal. One side of the insulating sheet is connected to the second mounting board, and the other side abuts against the connection terminal, and the third mounting board and the second mounting board are spaced apart along the third direction of the housing.
[0013] In one embodiment, the inner wall of the housing is provided with a first ear plate, a second ear plate, and a third ear plate. The first mounting board is connected to the first ear plate, the second mounting board is connected to the second ear plate, and the third mounting board is connected to the third ear plate.
[0014] In one embodiment, the first mounting board is provided with an avoidance notch, and a protective flange extending along the third direction of the housing is formed at the avoidance notch.
[0015] In one embodiment, a second flange connected to the housing is formed on one side of the first mounting board away from the second mounting board, and a third flange connected to the housing is formed on one side of the third mounting board away from the second mounting board.
[0016] In addition, the present invention further provides an inverter, including the box body as described above.
[0017] The technical solution of the present utility model adopts a first mounting plate, a second mounting plate and a third mounting plate connected in sequence along the first direction of the housing. At the same time, the first mounting plate and the third mounting plate are respectively connected to two inner walls of the housing arranged opposite to each other along its first direction, and the first mounting plate, the second mounting plate and the third mounting plate are bent along both sides in the second direction of the housing to form a first flanging that fits the inner wall of the housing, which can prevent fasteners from falling to the bottom of the housing. In this embodiment, the first mounting plate, the second mounting plate and the third mounting plate are connected in sequence along the first direction of the housing and are installed at the top in the housing, and one side of the first mounting plate away from the second mounting plate and one side of the third mounting plate away from the second mounting plate are respectively connected to two inner walls of the housing arranged opposite to each other along its first direction. Among them, the first mounting plate is used to install the control unit, the second mounting plate is used to install the output terminals, and the third mounting plate is used to install the input terminals. By respectively connecting one side of the first mounting plate away from the second mounting plate and one side of the third mounting plate away from the second mounting plate to two inner walls of the housing arranged opposite to each other along its first direction, the gap between the mounting component and the housing in the first direction can be eliminated; by bending the first mounting plate, the second mounting plate and the third mounting plate along both sides in the second direction of the housing 1 to form a first flanging and making the first flanging fit two side walls of the housing arranged opposite to each other along its second direction, the gap between the mounting component and the housing in the second direction can be eliminated. Thus, by arranging the above-mentioned first mounting plate, second mounting plate and third mounting plate, the gap between the mounting component and the housing in the first direction and the second direction can be eliminated to prevent fasteners from falling to the bottom of the housing. This box body is not only used to prevent fasteners from falling to the bottom of the housing, but also can be used to prevent various small components from falling into the housing. This box body is applied to technical fields such as frequency converters and electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.
[0019] Figure 1 It is an exploded view of one of the box bodies in the embodiment provided by the present utility model;
[0020] Figure 2 It is another exploded view of the box body in the embodiment provided by the present utility model;
[0021] Figure 3 It is a schematic structural diagram of the first mounting plate in the embodiment provided by the present utility model;
[0022] Figure 4 Schematic diagram of the structure of the second mounting plate in the embodiment provided by the present utility model;
[0023] Figure 5 Schematic diagram of the structure of the third mounting plate in the embodiment provided by the present utility model.
[0024] Explanation of the reference numerals in the drawings:
[0025] 1. Outer shell; 11. First ear plate; 12. Second ear plate; 13. Third ear plate; 2. First mounting plate; 21. First flanging; 22. Second flanging; 23. Avoidance notch; 231. Protective flanging; 3. Second mounting plate; 31. Mounting part; 311. Wiring terminal; 32. Connecting part; 33. Protective part; 331. Extension plate; 332. Protective plate; 4. Third mounting plate; 41. Connecting terminal; 42. Third flanging; 5. Insulating plate; 6. Insulating sheet.
[0026] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments
[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0028] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.
[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously.
[0030] In addition, the technical solutions between various embodiments of the present utility model can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0031] As an important electrical control device, the frequency converter is widely used in various occasions and can achieve precise control of parameters such as the speed and torque of the motor. During the actual working process, the researchers found that there are relatively large gaps between the components installed in the box body of the frequency converter. When disassembling and assembling the frequency converter, fasteners such as bolts used to fix the components can easily pass through the gaps and fall to the bottom of the box body. After the fasteners fall to the bottom of the box body, the construction personnel often need to remove multiple components installed inside the box body layer by layer to take out the fasteners, which has the problem of great difficulty in taking them out; if the fasteners are left in the box body after falling to the bottom of the box body, there are certain safety hazards, and electrical short circuits or even explosion of the machine may occur.
[0032] The present utility model proposes a box body, aiming to solve the technical problem that fasteners in the existing frequency converter are extremely likely to fall into the box body.
[0033] Please refer to Figures 1 to 5 , in an embodiment of the present utility model, the box body includes a housing 1 and an installation component. The installation component includes a first installation plate 2, a second installation plate 3, and a third installation plate 4 that are sequentially connected along the first direction of the housing 1. The first installation plate 2 and the third installation plate 4 are respectively connected to two inner walls of the housing 1 that are oppositely arranged along its first direction; and first flanges 21 are formed on both sides of the first installation plate 2, the second installation plate 3, and the third installation plate 4 along the second direction of the housing 1. The first flanges 21 extend along the third direction of the housing 1 and are attached to the inner wall of the housing 1. Among them, the first direction refers to the direction indicated by X in Figure 2 , the second direction refers to the direction indicated by Y in Figure 2 , and the third direction refers to the direction indicated by Z in Figure 2 . In a specific embodiment, the first direction can be one of the length direction and the width direction of the frequency converter, the second direction can be the other of the length direction and the width direction of the frequency converter, and the third direction can be the vertical direction.
[0034] The technical solution of the present utility model adopts a first mounting plate 2, a second mounting plate 3 and a third mounting plate 4 connected in sequence along the first direction of the housing 1. At the same time, the first mounting plate 2 and the third mounting plate 4 are respectively connected to two inner walls of the housing 1 arranged oppositely along its first direction, and the two sides of the first mounting plate 2, the second mounting plate 3 and the third mounting plate 4 along the second direction of the housing 1 are bent to form a first flange 21 that fits the inner wall of the housing 1, which can prevent fasteners from falling to the bottom of the housing 1. In this embodiment, the first mounting plate 2, the second mounting plate 3 and the third mounting plate 4 are connected in sequence along the first direction of the housing 1 and are installed on the top of the accommodating cavity of the housing 1. The side of the first mounting plate 2 away from the second mounting plate 3 and the side of the third mounting plate 4 away from the second mounting plate 3 are respectively connected to two inner walls of the housing 1 arranged oppositely along its first direction. Among them, the first mounting plate 2 is used to mount the control unit, the second mounting plate 3 is used to mount the output terminals, and the third mounting plate 4 is used to mount the input terminals. By connecting the side of the first mounting plate 2 away from the second mounting plate 3 and the side of the third mounting plate 4 away from the second mounting plate 3 to two inner walls of the housing 1 arranged oppositely along its first direction, the gap between the mounting component and the housing 1 in the first direction can be eliminated; by bending the two sides of the first mounting plate 2, the second mounting plate 3 and the third mounting plate 4 along the second direction of the housing 1 to form the first flange 21 and making the first flange 21 fit the two side walls of the housing 1 arranged oppositely along its second direction, the gap between the mounting component and the housing 1 in the second direction can be eliminated. Thus, by providing the above-mentioned first mounting plate 2, second mounting plate 3 and third mounting plate 4, the gap between the mounting component and the housing 1 in the first direction and the second direction can be eliminated to prevent fasteners from falling to the bottom of the housing 1. This box body is not only used to prevent fasteners from falling to the bottom of the housing 1, but also can be used to prevent various small components from falling into the housing 1. This box body is applied to technical fields such as frequency converters and electrical equipment.
[0035] It should be noted that in this embodiment, by bending the two sides of the first mounting plate 2, the second mounting plate 3 and the third mounting plate 4 along the second direction of the housing 1 to form the first flange 21 that fits the inner wall of the housing 1, it can better eliminate the gap between the mounting component and the housing 1 in the second direction. Specifically, when assembling the frequency converter, each mounting plate may have problems such as low manufacturing accuracy, resulting in situations such as the edge being concave or convex when it is installed in the housing 1. The first flange 21 formed by bending can block the fasteners when the fasteners fall onto the mounting plate, so as to prevent the fasteners from sliding into the bottom of the housing 1 along the convex or concave edge.
[0036] In an embodiment of the present utility model, the box body further includes an insulating board 5 and an insulating sheet 6. The insulating board 5 is disposed at the overlapping portion of the first mounting plate 2 and the second mounting plate 3, and the insulating sheet 6 is disposed at the overlapping portion of the second mounting plate 3 and the third mounting plate 4. In this embodiment, by disposing the insulating board 5 at the overlapping portion of the first mounting plate 2 and the second mounting plate 3, the gap between the first mounting plate 2 and the second mounting plate 3 can be shielded to prevent the fastener from falling to the bottom of the housing 1 through the gap between the first mounting plate 2 and the second mounting plate 3. By disposing the insulating sheet 6 at the overlapping portion of the second mounting plate 3 and the third mounting plate 4, the gap between the second mounting plate 3 and the third mounting plate 4 can be shielded to prevent the fastener from falling to the bottom of the housing 1 through the gap between the second mounting plate 3 and the third mounting plate 4.
[0037] Please refer to Figure 1 and Figure 2 , in an embodiment of the present utility model, the second mounting plate 3 is provided with a terminal 311, the third mounting plate 4 is provided with a connection terminal 41, and the third mounting plate 4 and the second mounting plate 3 are spaced apart along the third direction of the housing 1. In this embodiment, a plurality of terminals 311 are mounted on the second mounting plate 3, and the plurality of terminals 311 are spaced apart along the second direction of the housing 1. The terminal 311 is used as an output terminal and is electrically connected to an external three-phase motor through a wire. The third mounting plate 4 is provided with a plurality of connection terminals 41, and the plurality of connection terminals 41 are spaced apart along the second direction of the housing 1. The connection terminal 41 is used as an input terminal. By disposing the third mounting plate 4 and the second mounting plate 3 spaced apart along the third direction of the housing 1, that is, the third mounting plate 4 and the second mounting plate 3 are arranged from low to high in sequence, it is convenient for the construction personnel to wire at the terminal 311 or the connection terminal 41, and the assembly difficulty can be reduced. Specifically, when wiring the terminal 311 and the connection terminal 41, the wire needs to be inserted from one side thereof, and by mounting the second mounting plate 3 and the third mounting plate 4 at different heights, more space can be vacated to facilitate the construction personnel to wire at the terminal 311 or the connection terminal 41. To prevent the fastener from falling into the interior of the housing 1 from the side of the third mounting plate 4 avoiding the connection terminal 41, a flange is provided at a position on the side of the third mounting plate 4 close to the second mounting plate 3 and avoiding the connection terminal 41.
[0038] Please refer to Figure 1 and Figure 2, in an embodiment of the present utility model, the box body further includes an insulating board 5 and an insulating sheet 6; one side of the insulating board 5 is connected to the first mounting plate 2, and the other side abuts against the terminal 311; one side of the insulating sheet 6 is connected to the second mounting plate 3, and the other side abuts against the connection terminal 41. In this embodiment, by connecting one side of the insulating board 5 to the first mounting plate 2 and abutting the other side against the terminal 311, it can eliminate the gap generated due to the height difference between the second mounting plate 3 and the first mounting plate 2, that is, eliminate the gap between the terminal 311 and the first mounting plate 2, so as to prevent the fastener from falling to the bottom of the housing 1. By connecting one side of the insulating sheet 6 to the second mounting plate 3 and abutting the other side against the connection terminal 41, it can eliminate the gap generated due to the height difference between the third mounting plate 4 and the second mounting plate 3, that is, eliminate the gap between the connection terminal 41 and the second mounting plate 3, so as to prevent the fastener from falling to the bottom of the housing 1. In a specific embodiment, the insulating board 5 is connected to the first mounting plate 2 by bolts, and the insulating sheet 6 is connected to the second mounting plate 3 by bolts.
[0039] Please refer to Figure 1 and Figure 2 , in an embodiment of the present utility model, the inner wall of the housing 1 is provided with a first ear plate 11, a second ear plate 12 and a third ear plate 13. The first mounting plate 2 is connected to the first ear plate 11, the second mounting plate 3 is connected to the second ear plate 12, and the third mounting plate 4 is connected to the second ear plate 12. In this embodiment, the first ear plate 11, the second ear plate 12 and the third ear plate 13 are all arranged on two side walls of the housing 1 opposite to each other along its second direction, and the first ear plate 11 is directly below the side of the first mounting plate 2 close to the second mounting plate 3, the second ear plate 12 is directly below the second mounting plate 3, and the third ear plate 13 is directly below the side of the third mounting plate 4 close to the second mounting plate 3. By providing the first ear plate 11 connected to the first mounting plate 2, the second ear plate 12 connected to the second mounting plate 3 and the third ear plate 13 connected to the third mounting plate 4 on the inner wall of the housing 1, it can make the installation of each mounting plate more stable. Moreover, during the disassembly and assembly process, the construction personnel can adopt a top-down method to connect each mounting plate to the corresponding ear plate or remove each mounting plate from the corresponding ear plate, which can reduce the disassembly and assembly difficulty of each mounting plate. It should be noted that compared with the side disassembly and assembly method, the top-down disassembly and assembly method enables the construction personnel to disassemble and assemble the fasteners more conveniently, and at the same time can reduce the structural interference during disassembly and assembly, thereby reducing the disassembly and assembly difficulty. In a specific embodiment, each mounting plate is connected to the corresponding ear plate by bolts, and the number of the third ear plates 13 is two, and the two third ear plates 13 are symmetrically arranged on two side walls of the housing 1 opposite to each other along its second direction.
[0040] Please refer to Figure 3 and Figure 5, in an embodiment of the present utility model, a second flanging 22 connected to the housing 1 is formed on one side of the first mounting plate 2 away from the second mounting plate 3, and a third flanging 42 connected to the housing 1 is formed on one side of the third mounting plate 4 away from the second mounting plate 3. In this embodiment, the second flanging 22 is connected to the inner wall of the housing 1, and the third flanging 42 is connected to the inner wall of the housing 1, which can fix the first mounting plate 2 and the third mounting plate 4 to ensure the installation stability of the first mounting plate 2 and the third mounting plate 4. In a specific embodiment, both the second flanging 22 and the third flanging 42 are connected to the housing 1 by bolts.
[0041] Please refer to Figure 4 , in an embodiment of the present utility model, the second mounting plate 3 includes a mounting portion 31, a connecting portion 32, and a protection portion 33 that are sequentially connected along the second direction of the housing 1, and the mounting portion 31 and the protection portion 33 are spaced apart along the third direction of the housing 1. A first flanging 21 is formed on the protection portion 33, and the first flanging 21 formed on the protection portion 33 is connected to the housing 1. In this embodiment, the mounting portion 31 is perpendicular to the connecting portion 32, the protection portion 33 is perpendicular to the connecting portion 32, and first flangings 21 are bent on both the side of the mounting portion 31 away from the connecting portion 32 and the side of the protection portion 33 away from the connecting portion 32. The third mounting plate 4, the mounting portion 31, and the first mounting plate 2 are arranged in order from low to high, and the terminal block 311 is installed on the mounting portion 31. Arranging the mounting portion 31 and the protection portion 33 along the third direction of the housing 1, that is, arranging the mounting portion 31 and the protection portion 33 in order from low to high, can form a receiving space below the protection portion 33, thereby making room for the installation of the reactor of the frequency converter and avoiding interference between the second mounting plate 3 and the reactor of the frequency converter. In a specific embodiment, the first flanging 21 bent on the protection portion 33 is connected to the housing 1 by bolts, and the mounting portion 31 is connected to the second ear plate 12 by bolts.
[0042] Please refer to Figure 4 , in an embodiment of the present utility model, an extension plate 331 is formed on the protection portion 33, and the extension plate 331 is connected to the first mounting plate 2. In this embodiment, an extension plate 331 connected to the first mounting plate 2 is formed on the protection portion 33. When installing the second mounting plate 3, in addition to fixing the second mounting plate 3 by connecting the first flanging 21 bent on the protection portion 33 to the housing 1 and connecting the mounting portion 31 to the second ear plate 12, the second mounting plate 3 is further fixed by connecting the extension plate 331 to the first mounting plate 2, which can ensure the installation stability of the second mounting plate 3. In a specific embodiment, the extension plate 331 is connected to the first mounting plate 2 by bolts.
[0043] Please refer to Figure 4In one embodiment of the utility model, the protective part 33 and the connecting part 32 are enclosed to form an accommodation space, and the protective part 33 is formed with a protective plate 332 for shielding the accommodation space. In this embodiment, the mounting part 31 and the protective part 33 are arranged in sequence from low to high, and the protective part 33 and the connecting part 32 are enclosed to form an accommodation space. The accommodation space can make room for the installation of the reactor of the frequency converter to avoid interference between the second mounting plate 3 and the reactor of the frequency converter. In addition, the side of the protective part 33 away from the first mounting plate 2 is bent to form a protective plate 332 to shield the accommodation space, which can avoid the exposure of the reactor, thereby preventing the construction personnel from accidentally touching the reactor, and ensuring the safety of the construction personnel. It should be noted that in the frequency converter, the reactor often needs to carry a higher voltage. If the human body accidentally touches the reactor, electric shock and the like are very likely to occur. Therefore, when installing the reactor, it is necessary to avoid exposing the reactor as much as possible to ensure the safety of the construction personnel.
[0044] See also Figure 3 In one embodiment of the utility model, the first mounting plate 2 is provided with an avoidance notch 23, and a protective flange 231 extending along the third direction of the housing 1 is formed at the avoidance notch 23. In this embodiment, a door is hinged on the housing 1, and a communication module for the hand operator to be installed is arranged on the door. When the door is closed, the communication module will interfere with the first mounting plate 2. By providing the avoidance notch 23 on the first mounting plate 2, it is possible to avoid the communication module from interfering with the first mounting plate 2. At the same time, by providing the protective flange 231 extending along the third direction of the housing 1 at the avoidance notch 23, it is possible to prevent the fastener from falling into the interior of the housing 1 through the avoidance notch 23. In a specific embodiment, the avoidance notch 23 has a first side, a second side and a third side arranged in sequence, wherein the first side and the third side are formed with protective flanges 231 by bending, and the side of the control unit installed on the first mounting plate 2 is just at the second side.
[0045] The utility model also proposes a frequency converter, which includes the above-mentioned box body. The specific structure of the box body refers to the above-mentioned embodiment. Since the frequency converter adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.
[0046] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A box body, characterized in that, Comprising: A housing; An installation component, the installation component includes a first mounting plate, a second mounting plate and a third mounting plate connected in sequence along a first direction of the housing, the first mounting plate and the third mounting plate are respectively connected to two inner walls of the housing disposed opposite to each other along its first direction; and first flanges are formed on both sides of the first mounting plate, the second mounting plate and the third mounting plate along a second direction of the housing, and the first flanges extend along a third direction of the housing and are attached to the inner wall of the housing.
2. The box according to claim 1, characterized in that, The second mounting plate includes a mounting portion, a connecting portion and a protection portion connected in sequence along the second direction of the housing, and the mounting portion and the protection portion are spaced apart along the third direction of the housing, the protection portion forms the first flange, and the first flange formed by the protection portion is connected to the housing.
3. The box according to claim 2, characterized in that, The protection portion forms an extension plate, and the extension plate is connected to the first mounting plate.
4. The box according to claim 2, wherein, The protection portion and the connecting portion enclose a receiving space, and the protection portion forms a protection plate for shielding the receiving space.
5. The box according to claim 1, characterized in that, The box body further includes an insulating plate and an insulating sheet, the insulating plate is disposed at the overlapping portion of the first mounting plate and the second mounting plate, and the insulating sheet is disposed at the overlapping portion of the second mounting plate and the third mounting plate.
6. The box according to claim 5, characterized in that, The second mounting plate is provided with a terminal block, and the third mounting plate is provided with a connection terminal; one side of the insulating plate is connected to the first mounting plate, and the other side abuts against the terminal block; one side of the insulating sheet is connected to the second mounting plate, and the other side abuts against the connection terminal, and the third mounting plate and the second mounting plate are spaced apart along the third direction of the housing.
7. The box according to claim 1, wherein First ear plates, second ear plates and third ear plates are provided on the inner wall of the housing, the first mounting plate is connected to the first ear plate, the second mounting plate is connected to the second ear plate, and the third mounting plate is connected to the third ear plate.
8. The box according to any one of claims 1 to 7, characterized in that, The first mounting plate is provided with an avoidance notch, and a protection flange extending along the third direction of the housing is formed at the avoidance notch.
9. The box according to any one of claims 1 to 7, characterized in that, A second flange connected to the housing is formed on a side of the first mounting plate away from the second mounting plate, and a third flange connected to the housing is formed on a side of the third mounting plate away from the second mounting plate.
10. A frequency converter, characterized in that, Comprising the box body according to any one of claims 1 to 9.