Frequency converter and power equipment

Abstract

The embodiment of the utility model relates to the technical field of electrical equipment, and particularly discloses a frequency converter and electrical equipment, the frequency converter comprises a shell, a driving circuit board, a switching circuit board and a functional component, the driving circuit board is arranged in the shell, the switching circuit board is arranged in the shell, the switching circuit board is electrically connected with the driving circuit board, the switching circuit board is provided with a plug component, and the functional component is electrically connected with the switching circuit board. The functional assembly is arranged in the shell and provided with a socket assembly, the socket assembly is connected with the plug assembly in an inserted mode, and the functional assembly is electrically connected with the driving circuit board through the switching circuit board. By means of the mode, cable-free connection between the functional assembly and the driving circuit board is achieved, the internal structure of the frequency converter is simplified, the wiring difficulty and the production cost are reduced, the functional assembly is more convenient and rapid to disassemble and assemble through insertion connection of the plug assembly and the socket assembly, and the operation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of power equipment, in particular to a frequency converter and power equipment. BACKGROUND

[0002] As an important component of power equipment, the frequency converter is widely used in industrial control, automatic production line and various occasions requiring speed regulation and energy saving. The frequency converter applies frequency conversion technology and microelectronic technology to control the AC motor by changing the motor power supply frequency. The frequency converter usually supports function expansion to expand the functions of the frequency converter, for example, adding a keyboard assembly to the frequency converter, and the user inputs control instructions and sets parameters to the frequency converter through the keyboard assembly.

[0003] At present, when the frequency converter expands functions, the function assembly is usually connected to the drive circuit board through a cable. One end of the cable is fixed to the drive circuit board, and the other end of the cable is provided with a plug which is plugged into the socket of the function assembly. When the function assembly is removed from the frequency converter shell, the plug will be pulled out together with the function assembly. Therefore, a long length of cable needs to be reserved in the frequency converter shell, which increases the wiring difficulty and production cost of the frequency converter. In addition, when the function assembly is removed, the plug needs to be manually pulled out of the socket, and before the keyboard assembly is installed, the plug needs to be inserted into the socket, which is relatively cumbersome to operate. CONTENT OF THE INVENTION

[0004] In view of this, the embodiment of the present application provides a frequency converter and power equipment, which is beneficial to reduce the wiring difficulty and installation convenience, and improves the operation efficiency.

[0005] One of the technical solutions adopted by the present application is to provide a frequency converter, which comprises a shell, a drive circuit board, a conversion circuit board and a function assembly. The drive circuit board is arranged in the shell, the conversion circuit board is arranged in the shell, the conversion circuit board is electrically connected with the drive circuit board, the conversion circuit board is provided with a plug assembly, the function assembly is arranged in the shell, the function assembly is provided with a socket assembly, the socket assembly and the plug assembly are plugged, and the function assembly is electrically connected with the drive circuit board through the conversion circuit board.

[0006] In some embodiments, the plug assembly comprises a first plug, a second plug and a third plug, the first plug, the second plug and the third plug are arranged in sequence along a first direction, the function assembly comprises a keyboard assembly, a first expansion box and a second expansion box, the keyboard assembly, the first expansion box and the second expansion box are arranged in sequence along the first direction, the socket assembly comprises a first socket arranged in the keyboard assembly, a second socket arranged in the first expansion box and a third socket arranged in the second expansion box, along a second direction, the first socket is plugged with the first plug, the second socket is plugged with the second plug, and the third socket is plugged with the third plug, and the first direction, the second direction and the thickness direction of the conversion circuit board are perpendicular to each other.

[0007] In some embodiments, along the second direction, the projection of the first expansion box at least partially overlaps with the second expansion box, and / or the projection of the keyboard assembly at least partially overlaps with the first expansion box.

[0008] In some embodiments, the shell comprises an upper shell and a middle frame, the upper shell is connected with the middle frame, the upper shell and the middle frame enclose a first cavity, the functional assembly is located in the first cavity, the middle frame is provided with a slot, the adapter circuit board is installed in the slot, and the driving circuit board is located on a side of the middle frame away from the first cavity.

[0009] In some embodiments, along the first direction, the middle frame has opposite first and second inner walls in the slot, the first inner wall is provided with a first limiting slot, and the second inner wall is provided with a second limiting slot, when the adapter circuit board is plugged into the slot, the end portions of the two ends of the adapter circuit board along the first direction are respectively plugged into the first and second limiting slots.

[0010] In some embodiments, the middle frame is provided with a limiting assembly, the limiting assembly is located in the slot, and along the second direction, the limiting assembly abuts against the end of the adapter circuit board towards the first cavity.

[0011] In some embodiments, along the thickness direction of the adapter circuit board, the middle frame has opposite third and fourth inner walls in the slot, the limiting assembly comprises a first limiting block and two second limiting blocks, the first limiting block is arranged on the third inner wall, and the second limiting blocks are arranged on the fourth inner wall, along the thickness direction of the adapter circuit board, the projection of the first limiting block on the fourth inner wall is located between the two second limiting blocks, and the first and second limiting blocks abut against the end of the adapter circuit board towards the first cavity.

[0012] In some embodiments, one end of the first limiting block facing the first cavity is provided with a first guide inclined surface, and one end of the second limiting block facing the first cavity is provided with a second guide inclined surface.

[0013] In some embodiments, the middle frame is provided with a first accommodating slot, a second accommodating slot and a third accommodating slot, the first plug is arranged in the first accommodating slot, the second plug is arranged in the second accommodating slot, and the third plug is arranged in the third accommodating slot.

[0014] In some embodiments, the middle frame extends towards the first cavity with a first clamping piece, a second clamping piece, a first extension and a second extension, the first clamping piece and the second clamping piece are oppositely arranged along a first direction, the first extension and the second extension are oppositely arranged along a thickness direction of the adapter circuit board, the first extension is provided with a first clamping hole, the second extension is provided with a second clamping hole, along the first direction, the functional component is located between the first clamping piece and the second clamping piece, the first clamping piece and the second clamping piece clamp the functional component respectively, along the thickness direction of the adapter circuit board, the functional component is located between the first extension and the second extension, along the thickness direction of the adapter circuit board, a side wall on one side of the functional component is provided with a first elastic arm, a side wall on the other side is provided with a second elastic arm, the first elastic arm is provided with a first clamping post, and the second elastic arm is provided with a second clamping post, the first clamping post is clamped in the first clamping hole, and the second clamping post is clamped in the second clamping hole.

[0015] Another technical scheme adopted by the present application is to provide an electric power device comprising the above frequency converter.

[0016] The beneficial effects of the embodiments of the present application are that the embodiments of the present application provide a frequency converter and an electric power device, the frequency converter comprises a shell, a driving circuit board, an adapter circuit board and a functional component, the driving circuit board is arranged in the shell, the adapter circuit board is arranged in the shell, the adapter circuit board is electrically connected with the driving circuit board, the adapter circuit board is provided with a plug assembly, the functional component is arranged in the shell, the functional component is provided with a socket assembly, the socket assembly and the plug assembly are plugged, and the functional component is electrically connected with the driving circuit board through the adapter circuit board. In the above manner, the embodiments of the present application realize wireless cable connection between the functional component and the driving circuit board, simplify the internal structure of the frequency converter, reduce wiring difficulty and production cost, and through plugging of the plug assembly and the socket assembly, disassembly and assembly of the functional component become more convenient and efficient, and operation efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0018] Figure 1 is a perspective view of the frequency converter provided by the embodiments of the present application;

[0019] Figure 2 is an exploded view of the frequency converter provided by the embodiments of the present application;

[0020] Figure 3 is Figure 1 is a sectional view after being cut along the cutting line A-A;

[0021] Figure 4 is a perspective view of the driving circuit board, the plug assembly, the functional assembly and the socket assembly from another angle provided by the embodiment of the present application;

[0022] Figure 5 is a perspective view of the driving circuit board, the plug assembly, the functional assembly and the socket assembly from another angle provided by the embodiment of the present application;

[0023] Figure 6 is a perspective view of the middle frame from one angle provided by the embodiment of the present application;

[0024] Figure 7 is a perspective view of the middle frame from another angle provided by the embodiment of the present application; Figure 6 is a partial enlarged view of the middle B area;

[0025] Figure 8 is a partial enlarged view of the middle B area; Figure 7

[0026] Figure 9 is a perspective view of the middle frame from another angle provided by the embodiment of the present application;

[0027] Figure 10 is a perspective view of the middle frame from another angle provided by the embodiment of the present application; Figure 9 is a partial enlarged view of the middle C area. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present application, the present application will be described in more detail below in conjunction with the drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element or one or more intervening elements can be present therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element or one or more intervening elements can be present therebetween. The terms "vertical", "horizontal", "left", "right", and similar expressions used in the present specification are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used in the present specification are the same as those commonly understood by one skilled in the art to which the present application belongs. The terms used in the present specification are only for the purpose of describing specific embodiments of the present application and are not intended to limit the present application. The term "and / or" used in the present specification includes any and all combinations of one or more related listed items.

[0030] Please refer to Figure 1 and Figure 2 ​The frequency converter 10000 comprises a shell 1, a driving circuit board 2, a switching circuit board 3 and a functional assembly 4. The driving circuit board 2, the switching circuit board 3 and the functional assembly 4 are arranged in the shell 1. The switching circuit board 3 is connected with the driving circuit board 2. The functional assembly 4 is electrically connected with the driving circuit board 2 through the switching circuit board 3.

[0031] In some embodiments, referring to Figures 2 to 5 The switching circuit board 3 is provided with a plug assembly 5. The functional assembly 4 is provided with a socket assembly 6. The socket assembly 6 and the plug assembly 5 are plugged to achieve the electrical connection of the functional assembly 4 with the driving circuit board 2 through the switching circuit board 3.

[0032] In some embodiments, referring to Figure 2 and Figure 3 The shell 1 comprises an upper shell 11 and a middle frame 12. The upper shell 11 is connected with the middle frame 12. The upper shell 11 and the middle frame 12 enclose a first cavity 14. The middle frame 12 is provided with a slot 121. The switching circuit board 3 is installed in the slot 121. The functional assembly 4 is located in the first cavity 14. The driving circuit board 2 is located on the side of the middle frame 12 away from the first cavity 14. The functional assembly 4 and the driving circuit board 2 are respectively located on two sides of the middle frame 12, so that effective spatial isolation is formed between the functional assembly 4 and the driving circuit board 2. This not only helps heat dissipation, but also reduces electromagnetic interference between the two, thereby improving the stability and working efficiency of the frequency converter 10000.

[0033] In some embodiments, the shell 1 further comprises a lower shell 13. The lower shell 13 is connected to the side of the middle frame 12 away from the first cavity 14. The lower shell 13 and the middle frame 12 enclose a second cavity 15. The driving circuit board 2 is located in the second cavity 15.

[0034] In some embodiments, referring to Figure 6 and Figure 7 In the first direction x, the middle frame 12 has opposite first and second inner walls at the slot 121. The first inner wall is provided with a first limiting groove 122. The second inner wall is provided with a second limiting groove 123. When the switching circuit board 3 is plugged into the slot 121, the ends of the switching circuit board 3 in the first direction x are respectively plugged into the first and second limiting grooves 122 and 123, thereby limiting the movement of the switching circuit board 3 in the third direction z in the slot 121, and improving the stability of the switching circuit board 3 in the slot 121.

[0035] The first direction x is perpendicular to the third direction z. The first direction x is parallel to the length direction of the slot 121. The third direction z is parallel to the width direction of the slot 121. The third direction z is parallel to the thickness direction of the switching circuit board 3.

[0036] In some embodiments, the length of the switching circuit board 3 is equal to the length of the slot 121.

[0037] In some embodiments, the middle frame 12 is provided with a limiting assembly 124 located in the slot 121. When the adapter circuit board 3 is inserted into the slot 121 along the second direction y, the limiting assembly 124 abuts against the end of the adapter circuit board 3 towards the first cavity 14, thereby limiting the movement of the adapter circuit board 3 in the slot 121 along the second direction y, and stabilizing the adapter circuit board 3 in the slot 121, thereby improving the working stability of the frequency converter 10000. The second direction y is parallel to the depth direction of the slot 121, and the first direction x, the second direction y and the third direction z are perpendicular to each other.

[0038] In some embodiments, along the third direction z, the middle frame 12 has opposite third and fourth inner walls in the slot 121. The limiting assembly 124 includes a first limiting block 1241 and two second limiting blocks 1242, the first limiting block 1241 is arranged on the third inner wall, and the second limiting blocks 1242 are arranged on the fourth inner wall. Along the third direction z, the projection of the first limiting block 1241 on the fourth inner wall is located between the two second limiting blocks 1242, and the first limiting block 1241 and the second limiting blocks 1242 abut against the end of the adapter circuit board 3 towards the first cavity 14. The first limiting block 1241 and the two second limiting blocks 1242 form a three-point positioning of the adapter circuit board 3, which not only enhances the stability of the adapter circuit board 3 in the slot 121, but also enables the adapter circuit board 3 to more evenly disperse stress when subjected to external impact or vibration, thereby improving the reliability of the frequency converter 10000.

[0039] In some embodiments, referring to Figure 8 , one end of the first limiting block 1241 facing the first cavity 14 is provided with a first guide inclined surface 12411, and one end of the second limiting block 1242 facing the first cavity 14 is provided with a second guide inclined surface 12421. The first guide inclined surface 12411 and the second guide inclined surface 12421 are oppositely inclined along the width direction of the slot 121. When the adapter circuit board 3 is inserted into the slot 121, a part of the adapter circuit board 3 passes between the first limiting block 1241 and the second limiting block 1242 until the end of the adapter circuit board 3 towards the first cavity 14 abuts against the first limiting block 1241 and the second limiting block 1242. The first guide inclined surface 12411 and the second guide inclined surface 12421 facilitate guiding the adapter circuit board 3 to smoothly slide into the slot 121 and accurately align with the first limiting groove 122 and the second limiting groove 123.

[0040] In some embodiments, referring to Figure 2 and Figure 4The functional assembly 4 includes a keyboard assembly 41, a first expansion box 42, and a second expansion box 43, which are arranged in sequence along the first direction x. The keyboard assembly 41 is used to realize human-computer interaction, and is used for a user to input control instructions to set parameters of the frequency converter 10000, control the running state thereof, or view working state information thereof. The first expansion box 42 and the second expansion box 43 are used to expand the functions of the frequency converter 10000 to adapt to different application requirements. For example, the expansion box is internally provided with additional interface circuits, such as a communication interface, an analog input / output interface, and the like, so that the frequency converter 10000 can exchange data with other devices or systems, and realize functions such as remote monitoring, control, or data acquisition; or the expansion box integrates specific functional modules, such as overload protection, short-circuit protection, temperature monitoring, and the like, to enhance the safety performance and protection capability of the frequency converter 10000.

[0041] In some embodiments, referring to Figure 4 The socket assembly 6 includes a first socket 61, a second socket 62, and a third socket 63, the first socket 61 is arranged on the keyboard assembly 41, the second socket 62 is arranged on the first expansion box 42, and the third socket 63 is arranged on the second expansion box 43. The plug assembly 5 includes a first plug 51, a second plug 52, and a third plug 53, which are arranged in sequence along the first direction x. Along the second direction y, the first socket 61 is plugged with the first plug 51, the second socket 62 is plugged with the second plug 52, and the third socket 63 is plugged with the third plug 53. That is, the keyboard assembly 41, the first expansion box 42, and the second expansion box 43 can respectively realize independent and reliable electrical connection with the plug assembly 5, the relay circuit board 3, and even the drive circuit board 2 through the respective corresponding sockets, facilitating individual maintenance and replacement of each functional component, and reducing maintenance cost and time.

[0042] In some embodiments, referring to Figure 2 The keyboard assembly 41 includes a box body 411 and a key 412, the key 412 and the first socket 61 are arranged on two sides of the box body 411 in the second direction y, and the key 412 is used for pressing to input instructions.

[0043] In some embodiments, referring to Figure 3 Along the second direction y, the projection of the first expansion box 42 at least partially overlaps the second expansion box 43. The stacking design of the first expansion box 42 and the second expansion box 43 improves the space utilization rate in the shell 1, which is conducive to the miniaturization of the frequency converter 10000.

[0044] In some embodiments, along the second direction y, the projection of the box body 411 of the keyboard assembly 41 at least partially overlaps the first expansion box 42, further improving the space utilization rate in the shell 1.

[0045] In some embodiments, the structure of the functional assembly 4 is not limited to the above-mentioned limits, and can be flexibly configured according to actual application requirements. For example, in some application scenarios, the functional assembly 4 can only include the keyboard assembly 41 and a single expansion box to meet the basic control requirements and specific function expansion. In other application scenarios, the functional assembly 4 includes the keyboard assembly 41 and multiple expansion boxes to support more complex and diverse functional requirements, such as integrating multiple communication interfaces, adding more protection modules or control modules, etc. In addition, in order to adapt to different installation environments and space limitations, the layout and arrangement of the functional assembly 4 can also be adjusted.

[0046] In some embodiments, referring to Figure 4 , the adapter circuit board 3 is also provided with a first plug-in 31 and a second plug-in 32, the first plug-in 31 is used for plug-in of other electronic devices of the frequency converter 10000 to realize electrical connection with the adapter circuit board 3 and even the drive circuit board 2, and the adapter circuit board 3 is connected with the drive circuit board 2 through the second plug-in 32.

[0047] In some embodiments, referring to Figure 6 and Figure 7 , the middle frame 12 is provided with a containing groove 125, the containing groove 125 is communicated with the first cavity 14, and the plug-in assembly 5, the first plug-in 31 and the second plug-in 32 are arranged in the containing groove 125 to limit and fix the plug-in assembly 5, the first plug-in 31 and the second plug-in 32 on the circuit board 3 in the middle frame 12.

[0048] In some embodiments, the containing groove 125 includes a first containing groove 1251, a second containing groove 1252 and a third containing groove 1253, the first plug 51 is arranged in the first containing groove 1251, the second plug 52 is arranged in the second containing groove 1252, and the third plug 53 is arranged in the third containing groove 1253.

[0049] In some embodiments, the containing groove 125 also includes a fourth containing groove 1254 and a fifth containing groove (not shown in the figure), the fourth containing groove 1254 is communicated with the first cavity 14, the fifth containing groove is communicated with the second cavity 15, the first plug-in 31 is arranged in the fourth containing groove 1254, and the second plug-in 32 is arranged in the fifth containing groove.

[0050] In some embodiments, the second plug-in 32 is connected with the drive circuit board 2 through a cable, so as to realize electrical connection between the drive circuit board 2 and the adapter circuit board 3.

[0051] In some embodiments, referring to Figure 2 , Figure 9 and Figure 10The first clamping piece 126 and the second clamping piece 127 are oppositely arranged along the first direction x. The keyboard assembly 41 is arranged between the first clamping piece 126 and the second clamping piece 127. The first clamping piece 126 and the second clamping piece 127 clamp the box body 411 of the keyboard assembly 41 respectively, so as to limit and fix the keyboard assembly 41 to the middle frame 12, and the structural stability of the frequency converter 10000 is enhanced.

[0052] In some embodiments, the number of the first clamping piece 126 and the second clamping piece 127 is multiple. The first expansion box 42 and the second expansion box 43 are arranged between the first clamping piece 126 and the second clamping piece 127 respectively. The first expansion box 42 and the second expansion box 43 are clamped and fixed to the first clamping piece 126 and the second clamping piece 127 respectively.

[0053] In some embodiments, the middle frame 12 extends the first extension 128 and the second extension 129 towards the first cavity 14. The first extension 128 and the second extension 129 are oppositely arranged along the third direction z. The first extension 128 is provided with the first clamping hole 1280, and the second extension 129 is provided with the second clamping hole 1290. Along the third direction z, the side wall of one side of the first expansion box 42 is provided with the first elastic arm 421, and the side wall of the other side of the first expansion box 42 is provided with the second elastic arm 422. The first elastic arm 421 is provided with the first clamping table 4211, and the second elastic arm 422 is provided with the second clamping table 4221. The first clamping table 4211 is clamped in the first clamping hole 1280, and the second clamping table 4221 is clamped in the second clamping hole 1290.

[0054] In some embodiments, the number of the first extension 128 and the second extension 129 is multiple. The box body 411 of the keyboard assembly 41 and the second expansion box 43 are respectively provided with elastic arms on the two side walls along the third direction z. The elastic arms are respectively provided with clamping tables, which are clamped in the clamping holes of the extensions, so as to fix the second expansion box 43 and the keyboard assembly 41 to the middle frame 12.

[0055] In some embodiments, the first extension 128 and the second extension 129 are oppositely arranged along the first direction x. The functional assembly 4 is respectively provided with elastic arms on the two side walls along the first direction x. The clamping tables of the elastic arms are clamped in the clamping holes of the extensions.

[0056] In the embodiment of the present application, the frequency converter 10000 comprises a shell 1, a driving circuit board 2, a switching circuit board 3 and a functional assembly 4, the driving circuit board 2, the switching circuit board 3 and the functional assembly 4 are all arranged in the shell 1, the switching circuit board 3 is electrically connected with the driving circuit board 2, the switching circuit board 3 is provided with a plug assembly 5, the functional assembly 4 is provided with a socket assembly 6, the socket assembly 6 and the plug assembly 5 are plugged to realize the connection of the functional assembly 4 with the driving circuit board 2 through the switching circuit board 3, the electrical connection of the functional assembly 4 with the driving circuit board 2 can be realized without cable, the wiring difficulty and the production cost problem caused by the cable are avoided, meanwhile, the disassembly and assembly process of the functional assembly 4 is simplified, and the operation efficiency and the user experience are improved.

[0057] The embodiment of the present application also provides an electric power equipment, the electric power equipment comprises the frequency converter 10000, and the structure and the function of the frequency converter 10000 can be referred to the above embodiment, which will not be repeated here.

[0058] It should be noted that the specification and drawings of the present application provide the preferred embodiments of the present application, but the present application can be realized in many different forms, and is not limited to the embodiments described in the specification, and the embodiments do not limit the content of the present application additionally, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. And, the above technical features continue to combine, form various embodiments not listed above, which are considered to be within the scope of the present application; further, for those skilled in the art, the above description can be improved or changed, and all these improvements and changes should belong to the protection scope of the appended claims of the present application.

Claims

1. A frequency converter, characterized in that The utility model relates to a frequency converter, including: A shell; A drive circuit board arranged in the shell; An adapter circuit board arranged in the shell, the adapter circuit board is electrically connected with the drive circuit board, the adapter circuit board is provided with a plug assembly; A functional assembly arranged in the shell, the functional assembly is provided with a socket assembly, the socket assembly and the plug assembly are plugged, the functional assembly is electrically connected with the drive circuit board through the adapter circuit board.

2. The frequency converter of claim 1, wherein: The plug assembly comprises a first plug, a second plug and a third plug, the first plug, the second plug and the third plug are arranged in a first direction in sequence; The functional assembly comprises a keyboard assembly, a first expansion box and a second expansion box, the keyboard assembly, the first expansion box and the second expansion box are arranged in the first direction in sequence, the socket assembly comprises a first socket arranged in the keyboard assembly, a second socket arranged in the first expansion box and a third socket arranged in the second expansion box, in a second direction, the first socket is plugged with the first plug, the second socket is plugged with the second plug, and the third socket is plugged with the third plug; The first direction, the second direction and the thickness direction of the adapter circuit board are perpendicular to each other.

3. The frequency converter of claim 2, wherein: In the second direction, a projection of the first expansion box at least partially overlaps with the second expansion box, and / or a projection of the keyboard assembly at least partially overlaps with the first expansion box.

4. The frequency converter of claim 3, wherein: The shell comprises an upper shell and a middle frame, the upper shell is connected with the middle frame, the upper shell and the middle frame enclose a first cavity, the functional assembly is located in the first cavity, the middle frame is provided with a slot, the adapter circuit board is installed in the slot, and the drive circuit board is located on a side of the middle frame away from the first cavity.

5. The frequency converter of claim 4, wherein , In the first direction, the middle frame has opposite first and second inner walls in the slot, the first inner wall is provided with a first limiting slot, and the second inner wall is provided with a second limiting slot; When the adapter circuit board is plugged into the slot, ends of the adapter circuit board in the first direction are plugged into the first and second limiting slots, respectively.

6. The frequency converter of claim 5, wherein , The middle frame is provided with a limiting assembly, and the limiting assembly is located in the slot; In the second direction, the limiting assembly abuts against an end of the adapter circuit board facing the first cavity.

7. The frequency converter of claim 6, wherein , In the thickness direction of the adapter circuit board, the middle frame has opposite third and fourth inner walls in the slot; The limiting assembly comprises a first limiting block and two second limiting blocks, the first limiting block is arranged on the third inner wall, the second limiting blocks are arranged on the fourth inner wall, in the thickness direction of the adapter circuit board, a projection of the first limiting block on the fourth inner wall is located between the two second limiting blocks, and the first and second limiting blocks abut against the end of the adapter circuit board facing the first cavity.

8. The frequency converter of claim 7, wherein , The first limiting block is provided with a first guide inclined surface at one end facing the first cavity, and the second limiting block is provided with a second guide inclined surface at one end facing the first cavity.

9. The frequency converter of claim 4, wherein, The middle frame is provided with a first accommodating groove, a second accommodating groove and a third accommodating groove, the first plug is arranged in the first accommodating groove, the second plug is arranged in the second accommodating groove, and the third plug is arranged in the third accommodating groove.

10. The frequency converter of any one of claims 4-9, wherein, The middle frame extends towards the first cavity with a first clamping member, a second clamping member, a first extension and a second extension, the first clamping member and the second clamping member are oppositely arranged along the first direction, the first extension and the second extension are oppositely arranged along the thickness direction of the adapter circuit board, the first extension is provided with a first clamping hole, and the second extension is provided with a second clamping hole; Along the first direction, the functional component is located between the first clamping member and the second clamping member, the first clamping member and the second clamping member clamp the functional component respectively, along the thickness direction of the adapter circuit board, the functional component is located between the first extension and the second extension, along the thickness direction of the adapter circuit board, a side wall on one side of the functional component is provided with a first elastic arm, and a side wall on the other side is provided with a second elastic arm, the first elastic arm is provided with a first clamping post, and the second elastic arm is provided with a second clamping post, the first clamping post is clamped in the first clamping hole, and the second clamping post is clamped in the second clamping hole.

11. An electrical power device, characterized by The frequency converter as claimed in any one of claims 1-10.

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