A frequency converter

Abstract

The application provides a frequency converter, comprising a shell and an internal chamber surrounded by the shell, the shell comprises an insulating shell and a metal shell, a total grounding terminal is fixed on the insulating shell, the total grounding terminal is connected with a first metal plug connector; the metal shell is provided with a second metal plug connector matched with the first metal plug connector; wherein when the insulating shell is connected with the metal shell to surround the internal chamber, the first metal plug connector is plugged with the second metal plug connector, so that the metal shell and the total grounding terminal are conducted to ground. In this way, when assembling, only the metal shell and the insulating shell need to be connected, so that the first metal plug connector and the second metal plug connector are synchronously plugged and conducted, without additional connection operation, which is convenient to operate and is beneficial to improving the assembly efficiency and cost.

Description

Technical Field

[0001] This application relates to the field of industrial equipment technology, and specifically to a frequency converter. Background Technology

[0002] A frequency converter is a device that adjusts the speed of a motor by changing the frequency of the power supply. A frequency converter generally consists of a housing and internal functional components. The housing is typically composed of an insulating shell and a metal shell, which together enclose the space containing the internal functional components.

[0003] For safety reasons, the metal casing of the frequency converter and its internal functional components need to be grounded. Currently, this is mainly achieved by connecting the metal casing to the main grounding terminal using a grounding sheet metal part or a wire. The end of the grounding sheet metal part or wire is then connected to the metal casing and the main grounding terminal using screws. However, screws occupy a large amount of space and require additional machining of threaded holes, resulting in higher requirements for space and cost. Moreover, tools are needed to tighten the screws during assembly, which can easily lead to missed tightening or loosening and failure. Due to the limited internal space of the frequency converter, the tightening operation is time-consuming and labor-intensive, affecting assembly efficiency and cost. Utility Model Content

[0004] In view of this, this application provides a frequency converter that simplifies the grounding operation of metal parts, overcomes the internal space limitations of the frequency converter, and improves assembly efficiency.

[0005] Therefore, this application provides the following technical solution:

[0006] A frequency converter includes a housing and an internal cavity enclosed by the housing. The housing includes an insulating housing and a metal housing. A main grounding terminal is fixed on the insulating housing and connected to a first metal connector. A second metal connector that matches the first metal connector is provided on the metal housing.

[0007] When the insulating shell is connected to the metal shell to form an internal cavity, the first metal connector is inserted into the second metal connector, so that the metal shell and the main grounding terminal are connected to ground.

[0008] Optionally, the first end of the first metal connector is formed as a tab, and the second metal connector is formed as a resiliently expandable slot. When the tab is inserted into the slot, the slot elastically clamps the tab.

[0009] Optionally, the slot includes a guide portion near the opening of the slot, the width of which gradually decreases along the direction from the opening of the slot to the bottom of the slot.

[0010] Optionally, the slot includes a receiving portion near the bottom of the slot, the width of which gradually increases along the direction from the opening to the bottom of the slot.

[0011] Optionally, the second end of the first metal connector is formed as a connecting plate perpendicularly connected to the insert, and the connecting plate is connected to the main grounding terminal by a long bolt.

[0012] Optionally, the metal housing is provided with a slot, and the second metal connector is engaged in the slot.

[0013] Optionally, the slot on the metal housing is formed between two blocks, which are formed by punching holes in the metal housing.

[0014] Optionally, the second metal connector and the metal housing are respectively provided with riveting holes, and are riveted together by passing rivets through the riveting holes.

[0015] Optionally, the metal housing is provided with two mounting holes, and the second metal connector is provided with two flip-up buckles, which pass through the two mounting holes respectively and are folded between the two mounting holes.

[0016] The frequency converter provided in this application has a main grounding terminal and a first metal connector on the insulating housing, and a second metal connector on the metal housing. The positions and structures of the first and second metal connectors are matched. When the metal housing is connected to the insulating housing, the first and second metal connectors are plugged in and connected, allowing the metal housing to be connected to the main grounding terminal on the insulating housing, thus achieving grounding of the metal housing. Therefore, during assembly, only the metal housing and the insulating housing need to be connected to simultaneously connect the first and second metal connectors, eliminating the need for additional connection operations. This convenient operation improves assembly efficiency and reduces costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 A cross-sectional view of a frequency converter shown for some embodiments of this application;

[0019] Figure 2 Internal connection diagram of a frequency converter shown for some embodiments of this application;

[0020] Figure 3 This is a grounding connection diagram of the metal casing shown in the first embodiment of this application;

[0021] Figure 4 for Figure 3 A magnified view of a portion of the image;

[0022] Figure 5 A perspective view of the second metal connector shown in the first embodiment of this application;

[0023] Figure 6 A side view of the second metal connector shown in the first embodiment of this application;

[0024] Figure 7 This is a grounding connection diagram of the metal casing shown in the second embodiment of this application;

[0025] Figure 8 for Figure 7 A magnified view of a portion of the image;

[0026] Figure 9 A perspective view of the second metal connector shown in the second embodiment of this application;

[0027] Figure 10 This is a side view of the second metal connector shown in a second embodiment of this application.

[0028] Explanation of reference numerals in the attached drawings: 1. Insulating housing; 2. Metal housing; 21. Locking block; 22. Mounting hole; 3. Main grounding terminal; 4. First metal connector; 41. Main body plate; 42. Connecting plate; 5. Second metal connector; 51. Guide part; 52. Receiving part; 53. Metal base; 54. Metal spring; 55. Riveting hole; 56. Flip buckle; 6. Long bolt; 7. Circuit board. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] like Figures 1-10As shown, this application embodiment provides a frequency converter, including a housing and component modules such as circuit boards, capacitors, heat sinks, and connecting wires disposed within the housing. The housing includes an insulating shell 1 and a metal shell 2, with the insulating shell 1 connected to the metal shell 2 to form a mounting chamber for accommodating the component modules. Specifically, the metal shell 2 is configured as a base plate, and the insulating shell 1 is configured as a cover. The mounting chamber is formed inside the insulating shell 1, and the metal shell 2 is connected to the opening of the insulating shell 1 to seal the mounting chamber. Here, the metal shell 2 serves as the base plate of the frequency converter, providing contact support and improving the protective effect of the housing. Furthermore, the metal shell 2 can also be formed on the side or top of the housing, depending on the layout of the frequency converter in the actual design.

[0031] A main grounding terminal 3 is fixed on the insulating housing 1. The main grounding terminal 3 is grounded through a grounding line to achieve grounding installation of the frequency converter. For example, the main grounding terminal 3 is set as a metal plate structure, with its first end located inside the insulating housing 1 and its second end located outside the insulating housing 1, so that the main grounding terminal 3 can lead out the grounding components (such as circuit boards that need to be grounded) inside the insulating housing 1. A first metal plug 4 is disposed inside the mounting cavity formed by the insulating housing 1 and connected to the first end of the main grounding terminal 3 to make the first metal plug 4 and the main grounding terminal 3 equipotential. In addition, the circuit board 7 and other component modules located in the mounting cavity are also connected to the main grounding terminal 3 to achieve grounding of the circuit on the circuit board 7.

[0032] A second metal connector 5 is provided on the metal housing 2. The positions and structures of the first metal connector 4 and the second metal connector 5 are matched. When the metal housing 2 is connected to the insulating housing 1, the first metal connector 4 and the second metal connector 5 are plugged in and connected. Through the connection between the first metal connector 4 and the second metal connector 5, the metal housing 2 can be connected to the fixed main grounding terminal 3 on the insulating housing 1, thereby realizing the grounding installation of the metal housing 2. In this way, during assembly, it is only necessary to connect the metal housing 2 and the insulating housing 1 to make the first metal connector 4 and the second metal connector 5 plug in and connect simultaneously without additional connection operations. This is convenient and helps to improve assembly efficiency and reduce costs.

[0033] It should be noted that when the metal housing 2 and the insulating housing 1 are connected, the insertion state of the first metal connector 4 and the second metal connector 5 is the final state. However, based on the various installation methods of the metal housing 2 and the insulating housing 1, the insertion method of the first metal connector 4 and the second metal connector 5 can also be set to various different forms.

[0034] Specifically, the installation direction of the metal housing 2 and the insulating housing 1 is the direction from the opening of the mounting chamber to the inner bottom (defined here as the first direction). By displacing the metal housing 2 along the first direction, the metal housing 2 gradually covers the opening of the insulating housing 1 (mounting chamber). Finally, it is tightened with screws. At this time, the insertion direction of the first metal connector 4 and the second metal connector 5 is parallel to the installation direction of the metal housing 2 and the insulating housing 1, both being the first direction. In this way, as the openings of the metal housing 2 and the insulating housing 1 are gradually aligned, the first metal connector 4 and the second metal connector 5 are gradually inserted, with high synchronization and easy operation.

[0035] Alternatively, the metal housing 2 can be initially misaligned with the opening of the insulating housing 1, and then gradually aligned with the opening of the insulating housing 1 along the vertical direction of the first direction. At this time, the insertion direction of the first metal connector 4 and the second metal connector 5 is perpendicular to the first direction, so that the insertion of the first metal connector 4 and the second metal connector 5 is gradually completed during the alignment process of the metal housing 2 and the insulating housing 1. Finally, the metal housing 2 and the insulating housing 1 are tightened with screws, simultaneously locking the insertion of the first metal connector 4 and the second metal connector 5.

[0036] In this embodiment, the first metal connector 4 is provided with a insert, and the second metal connector 5 is provided with a slot. The slot is designed to be elastically expandable and contractable. Under its own elasticity, the internal space of the slot expands and contracts to accommodate the size of the insert. When the first metal connector 4 and the second metal connector 5 are connected, the insert is located in the slot. Under the elasticity of the slot, the side wall of the slot clamps the insert. This results in a stronger contact force between the insert and the slot, which helps to improve the connection strength of the first metal connector 4 and the second metal connector 5 and enhances the conductivity.

[0037] The slot includes a guide portion 51 and a receiving portion 52. The guide portion 51 is close to the opening of the slot, and the receiving portion 52 is close to the bottom of the slot. During the insertion of the insert into the slot, the insert is first inserted into the guide portion 51 and then into the receiving portion 52. The width of the guide portion 51 gradually decreases along the direction from the opening to the bottom of the slot. Specifically, the maximum width of the guide portion 51 is greater than the thickness of the insert, and the minimum width of the guide portion 51 is less than the width of the insert. The guide portion 51 can guide the insert, facilitating the alignment of the insert and the slot. It also allows for a larger margin when the first metal connector 4 and the second metal connector 5 are inserted, enabling quick and accurate insertion of the first metal connector 4 and the second metal connector 5.

[0038] The width of the receiving portion 52 gradually increases along the direction from the opening to the bottom of the slot. Specifically, the width of the receiving portion 52 at any position is greater than or equal to the minimum width of the guide portion 51, and the maximum width of the receiving portion 52 is greater than or equal to the thickness of the insert. When the insert is inserted into the slot, the receiving portion 52 provides clearance for the insert and does not interfere with the force applied to it. This ensures that the sidewall between the guide portion 51 and the receiving portion 52 always elastically abuts against the insert, thereby improving the stability and safety of the insertion of the insert and the slot.

[0039] Specifically, the second metal connector 5 is configured as a spring-loaded socket, which includes a metal base 53 and two metal springs 54 connected to the base. Notably, the metal base 53 and the metal springs 54 can be integrally machined, resulting in high structural strength. The two metal springs 54 are positioned opposite each other, forming the aforementioned slot between them for inserting a prong. Through the elastic bending of the two metal springs 54 themselves or their elastic flipping relative to the base, the prong can be elastically clamped between the two metal springs 54. This simple structure helps save costs.

[0040] In conjunction with the guide portion 51 and the receiving portion 52 described above, the guide portion 51 and the receiving portion 52 can be formed by bending the metal spring piece 54 so that the metal spring piece 54 has at least one bending position and the two metal spring pieces 54 are arranged in a mirror image.

[0041] like Figure 3 , Figure 7 As shown, the first metal connector 4 is L-shaped, with a main body plate 41 and a connecting plate 42 perpendicular to each other. The end of the main body plate 41 furthest from the main grounding terminal 3 is designated as a insert, and the connecting plate 42 is located at the end of the first metal connector 4 closest to the main grounding terminal 3. The first metal connector 4 is connected to the main grounding terminal 3 via the connecting plate 42, thus establishing a conductive connection between the two terminals. The extension direction of the main body plate 41 is parallel to the insertion direction of the first metal connector 4 and the second metal connector 5, meaning the connecting plate 42 is perpendicular to the insertion direction of the first metal connector 4 and the second metal connector 5. When the first metal connector 4 and the second metal connector 5 are inserted, the side of the connecting plate 42 bears the insertion force. The large surface area and low pressure prevent damage to other components.

[0042] In the specific design, multiple circuit boards 7 are installed inside the insulating housing 1. The grounding positions of all multiple circuit boards 7 need to be connected to the main grounding terminal 3. Due to the constraints of the internal structure, the main grounding terminal 3 and the first metal connector 4 are located on both sides of one of the circuit boards 7. The connecting plate 42 of the first metal connector 4 abuts against the grounding position of the circuit board 7 and is connected to the main grounding terminal 3 by a long bolt 6, so that the grounding positions of the first metal connector 4 and the circuit board 7 are simultaneously connected to the main grounding terminal 3.

[0043] like Figure 3-6 As shown, in the first embodiment, the second metal connector 5 is riveted to the metal housing 2. Specifically, the second metal connector 5 and the metal housing 2 are provided with riveting holes 55, and rivets are inserted into the riveting holes 55 to form a connection between the second metal connector 5 and the metal housing 2. This connection is convenient, structurally stable, highly reliable, and low in cost. Of course, the second metal connector 5 and the metal housing 2 can also be bolted together.

[0044] A slot is provided on the metal housing 2, and the second metal connector 5 is snapped into the slot. By limiting the position of the second metal connector 5 through the slot, the positional installation stability of the second metal connector 5 can be improved, and the insertion accuracy of the first metal connector 4 and the second metal connector 5 can be improved.

[0045] In the case of the slot design, the inner wall of the slot abuts and engages with the outer wall of the slot. Specifically, two locking blocks 21 are machined on the metal housing 2. The locking blocks 21 can be formed by punching holes in the metal housing 2 to create a locking groove between the two locking blocks 21.

[0046] like Figure 7-10 As shown, in the second embodiment, the second metal connector 5 is connected to the metal housing 2 via flip-up fasteners 56. The second metal connector 5 has two flip-up fasteners 56, and the metal housing 2 has two mounting holes 22. The two flip-up fasteners 56 and the two mounting holes 22 are positioned to fit together, so that after passing through the two mounting holes 22, each flip-up fastener 56 folds over between the two mounting holes 22, thus clamping the area between the two mounting holes 22 and fixing the second metal connector 5 and the metal housing 2. This provides high connection stability between the second metal connector 5 and the metal housing 2, a simple structure, and low cost.

[0047] It should be noted that the "parallel condition" in this application refers to one direction being parallel to another, but it is not limited to the two being absolutely parallel. For example, one direction may be nearly parallel to the other, which is defined here as an angle of less than 2 degrees. The "perpendicular condition" in this document refers to one direction being perpendicular to another, but it is not limited to the two being absolutely perpendicular. For example, one direction may be nearly perpendicular to the other, which is defined here as an angle of less than 92 degrees and greater than 88 degrees.

[0048] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0049] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0050] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0051] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0052] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0053] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A frequency converter, comprising a housing and an internal cavity enclosed by the housing, characterized in that, The housing includes an insulating housing and a metal housing. A main grounding terminal is fixed on the insulating housing and is connected to a first metal connector. A second metal connector that matches the first metal connector is provided on the metal housing. When the insulating shell is connected to the metal shell to form an internal cavity, the first metal connector is inserted into the second metal connector, so that the metal shell and the main grounding terminal are connected to ground.

2. The frequency converter according to claim 1, characterized in that, The first end of the first metal connector is formed as a tab, and the second metal connector is formed as a resiliently expandable slot. When the tab is inserted into the slot, the slot elastically clamps the tab.

3. The frequency converter according to claim 2, characterized in that, The slot includes a guide portion near the opening of the slot, the width of which gradually decreases from the opening of the slot to the bottom of the slot.

4. The frequency converter according to claim 3, characterized in that, The slot includes a receiving portion near the bottom of the slot, the width of which gradually widens along the direction from the opening to the bottom of the slot.

5. The frequency converter according to claim 2, characterized in that, The second end of the first metal connector is formed as a connecting plate that is perpendicularly connected to the insert, and the connecting plate is connected to the main grounding terminal by a long bolt.

6. The frequency converter according to claim 1, characterized in that, The metal housing is provided with a slot, and the second metal connector is snapped into the slot.

7. The frequency converter according to claim 6, characterized in that, The slot on the metal housing is formed between two blocks, which are formed by punching holes in the metal housing.

8. The frequency converter according to claim 1 or 6, characterized in that, The second metal connector and the metal housing are respectively provided with riveting holes, and are riveted together by passing rivets through the riveting holes.

9. The frequency converter according to claim 1, characterized in that, The metal housing has two mounting holes, and the second metal connector has two flip-up buckles. The two flip-up buckles pass through the two mounting holes respectively and are folded between the two mounting holes.

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