Wire terminal and frequency converter

Abstract

The application relates to a wiring terminal and a frequency converter. The wiring terminal comprises a terminal seat and a sheet metal part. The terminal seat is provided with a containing cavity. The sheet metal part is arranged in the containing cavity. The sheet metal part comprises a first connecting piece. The first connecting piece is used for connecting with a conductive row and an external cable. The application can realize the connection of the conductive row and the external cable through the first connecting piece. The structure and operation are simple. The sheet metal part is matched with the containing cavity. The sheet metal part is limited in the containing cavity. Therefore, the possibility of falling and rotating of the first connecting piece is low during use. The connection reliability of the external cable is improved.

Description

Technical Field

[0001] This application relates to the field of motor drive technology, and in particular to a terminal block and frequency converter. Background Technology

[0002] Inverters are used to control the speed, torque, and direction of motors. The inverter's busbars connect to external power sources and the motor via pre-installed terminals. In related technologies, a nut is typically embedded inside the terminal block to secure the busbar. This method often requires disassembling the terminal block into two plastic parts, inserting the nut between them, and then fastening them together, with one of the plastic parts holding the nut in place. This approach results in a complex terminal block structure, and during use, there is a possibility that the nut may fall out or rotate. Utility Model Content

[0003] Therefore, it is necessary to provide a wiring terminal and a frequency converter that address the problems of complex wiring terminal structure and the possibility of detachment or rotation during use in related technologies.

[0004] According to one aspect of this application, an embodiment of this application provides a terminal block, the terminal block comprising:

[0005] Terminal block, the terminal block having a receiving cavity; and

[0006] A sheet metal part is disposed within the accommodating cavity. The sheet metal part includes a first connector for connecting to a conductive busbar and an external cable.

[0007] In one embodiment, the first connector is a connecting nut, and the terminals of the conductive busbar, the external cable, and the connecting nut are fixedly connected by connecting screws.

[0008] In one embodiment, the accommodating cavity includes a top wall, and a first through hole is formed in the top wall at a position corresponding to the connecting nut. The connecting screw passes through the terminal of the conductive busbar, the external cable, the first through hole, and connects to the connecting nut.

[0009] In one embodiment, the sheet metal part is further provided with a second connector for fixing the conductive busbar.

[0010] In one embodiment, the second connector is a fixing nut, and the fixing end of the conductive busbar is fixedly connected to the fixing nut by a fixing screw.

[0011] In one embodiment, the accommodating cavity includes a top wall, and a second through hole is provided on the top wall at a position corresponding to the fixing nut. The fixing screw passes through the fixing end of the conductive bar and the second through hole and is connected to the fixing nut.

[0012] In one embodiment, the accommodating cavity includes a top wall, the side of the top wall opposite to the sheet metal part being a conductive busbar overlapping surface, the conductive busbar overlapping surface being used to place the conductive busbar, a positioning pin being provided on the conductive busbar overlapping surface, and a positioning hole being provided on the conductive busbar opposite to the positioning pin, so as to position the conductive busbar by inserting the positioning pin into the positioning hole.

[0013] In one embodiment, the receiving cavity includes a guide wall located at the opening of the receiving cavity, defining a first axis parallel to the direction along the opening toward the inside of the receiving cavity, the first axis passing through the receiving cavity, and the distance between the guide wall and the first axis gradually decreasing along the direction along the opening toward the inside of the receiving cavity.

[0014] In one embodiment, the receiving cavity includes a top wall and a limiting wall opposite each other along a first direction; the limiting wall has a protrusion facing the top wall, and the sheet metal part is positioned between the top wall and the limiting wall; and / or

[0015] There is a draft angle between the top wall and the limiting wall.

[0016] In one embodiment, the accommodating cavity further includes a stepped wall and a bottom wall, the stepped wall being disposed on the side of the limiting wall away from the top wall, the bottom wall being disposed on the side of the stepped wall away from the limiting wall, and the first connecting member being located between the limiting wall and the stepped wall.

[0017] In one embodiment, the terminal block has at least two of the receiving cavities, the terminal block includes at least two of the sheet metal parts, and the at least two sheet metal parts correspond one-to-one with the at least two receiving cavities. The at least two receiving cavities are spaced apart from each other along a second direction. Each receiving cavity includes a top wall, and the side of the top wall facing away from the sheet metal part is a conductive busbar contact surface.

[0018] The terminal block also includes a partition, which is disposed between the overlapping surfaces of two adjacent conductive bars.

[0019] In one embodiment, the terminal block includes a first terminal block and a second terminal block, which partially overlap along a first direction.

[0020] In one embodiment, the first terminal block further includes a reinforcement that extends toward the second terminal block along the first direction.

[0021] In one embodiment, the reinforcing member and the second terminal block have a predetermined distance along the first direction.

[0022] In one embodiment, the second terminal block further includes a support member that extends away from the first terminal block along the first direction.

[0023] In one embodiment, the terminal block includes a magnetic ring mounting portion, which is located outside the accommodating cavity and is used to mount a magnetic ring.

[0024] According to another aspect of this application, an embodiment of this application provides a frequency converter, which includes a chassis, a busbar, and a terminal block as described in any of the above embodiments. The terminal block is installed in the chassis, one end of the busbar is connected to a device of the frequency converter, and the other end is connected to an external cable through the terminal block.

[0025] In the aforementioned terminal blocks and frequency converters, a receiving cavity is provided within the terminal block socket, and a sheet metal part is housed within the receiving cavity. A first connector is provided on the sheet metal part, enabling the connection between the conductive busbar and external cables. The terminal block structure of this application is simple, eliminating the need for disassembling the terminal block into two interlocking plastic parts, as in related technologies, and connecting external cables by inserting a nut between the two plastic parts. This application achieves the connection between the conductive busbar and external cables solely through the first connector. The terminal block structure is simple, and the operation of external cables is straightforward. Furthermore, the sheet metal part of this application is compatible with the receiving cavity and confined within it. Therefore, the possibility of the first connector detaching or rotating during use is low, improving the reliability of the external cable connection. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the sheet metal parts in some embodiments of this application.

[0027] Figure 2 This is a schematic diagram of the structure of the wiring terminals in some embodiments of this application.

[0028] Figure 3 This is a schematic diagram of the structure of sheet metal parts disposed in terminal blocks in some embodiments of this application.

[0029] Figure 4 This is a schematic diagram of the structure of the second terminal block in some embodiments of this application.

[0030] Figure 5 This is a schematic diagram showing the structure of the corresponding receiving cavity exposed in some embodiments of this application for the second terminal block.

[0031] Figure 6This is a cross-sectional view of the second terminal block in some embodiments of this application.

[0032] Figure 7 This is a schematic diagram of the terminal block structure in some other embodiments of this application.

[0033] Figure 8 This is a schematic diagram of the wiring terminals installed inside the chassis in some other embodiments of this application.

[0034] Figure 9 This is a cross-sectional view of the wiring terminals in some other embodiments of this application.

[0035] Explanation of icon numbers:

[0036] Terminal block 10;

[0037] Terminal block 11, first terminal block 11a, second terminal block 11b, accommodating cavity Q, top wall Q1, guide wall Q2, limiting wall Q3, step wall Q4, bottom wall Q5, protrusion 111, conductive busbar contact surface m, first through hole k1, second through hole k2, positioning pin 112, partition 113, reinforcing member 114, supporting member 115, first fixing hole k3, second fixing hole k4, magnetic ring mounting part 116;

[0038] Sheet metal part 12, first connector 121, sheet metal part body 122, second connector 123;

[0039] Connecting screw 13, fixing screw 14;

[0040] Conductive bus 20, terminal 201, fixed terminal 202;

[0041] Chassis 30;

[0042] First direction F1, second direction F2, axis L. Detailed Implementation

[0043] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0044] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0045] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0048] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0049] When using a motor, it needs to be connected to a frequency converter to control the motor's speed, torque, and direction. The wiring terminals inside the frequency converter are key components that connect the main components of the frequency converter to the external power supply and the motor. They are the electrical connection points between the main components of the frequency converter and the external power supply (such as three-phase AC power) and the motor.

[0050] For frequency converters, terminal blocks are typically provided for customer use to facilitate cable connections. These usually include input, output, braking, and positive / negative connection points. A common approach in related technologies is to use PCB gate terminal blocks provided by the supplier. These gate terminals have built-in conductors that extend beyond the bottom surface and are soldered onto the circuit board as inserts.

[0051] However, as the power of the frequency converter increases, the input and output currents also increase, requiring the terminals to accommodate larger cable specifications. This leads to a corresponding increase in the size of the terminals, making soldering them onto the circuit board difficult when the power reaches a certain level. Furthermore, the connection strength of the terminals is affected, resulting in a decrease in connection strength. To address this issue, related technologies typically employ a method of embedding a nut inside the terminal block to fix the conductive busbar to the terminal block and connect the conductive busbar and external cables. However, this setup often requires disassembling the terminal block into two plastic parts, inserting a nut between the two parts, and then fastening them together, with one of the plastic parts supporting the nut. This method results in a complex terminal block structure, and during use, the nut may fall off or rotate, leading to poor connection convenience and stability.

[0052] Based on this, this application provides a terminal block and a frequency converter. The terminal block has a simple structure, is easy to connect to external cables, and can improve the stability and strength of the connection with external cables.

[0053] See Figure 1 , Figure 2 and Figure 3 As shown, Figure 1 This is a schematic diagram of the structure of sheet metal part 12 in some embodiments of this application. Figure 2 This is a schematic diagram of the structure of the terminal block 10 in some embodiments of this application. Figure 3This is a schematic diagram of the structure of the sheet metal part 12 disposed in the terminal block 11 in some embodiments of this application.

[0054] The terminal block 10 provided in this application includes a terminal block 11 and a sheet metal part 12. The sheet metal part 12 can improve the connection stability and connection strength of external cables.

[0055] The terminal block 11 has a receiving cavity Q, and a sheet metal part 12 is disposed in the receiving cavity Q. The sheet metal part 12 includes a first connector 121, which is used to connect with the conductive bus 20 and external cables. That is, the connection between the conductive bus 20 and external cables can be realized through the first connector 121.

[0056] Understandably, related technologies typically require splitting the terminal block 10 into two plastic parts, then inserting nuts or other mounting components between the two parts to connect external cables, which is a rather cumbersome process. However, this application achieves the connection between the conductive busbar 20 and the external cable simply by using the first connector 121 of the sheet metal part 12, eliminating the need for additional mounting components and making the operation simple and convenient.

[0057] Furthermore, the sheet metal part 12 of this application includes a structure with a first connector 121, making the first connector 121 less prone to movement and reducing the possibility of it falling off or rotating. Simultaneously, the design of the sheet metal part 12 being disposed within the receiving cavity Q confines it within the cavity, which helps to keep the first connector 121 in a relatively stable state during use, further reducing the possibility of it falling off or rotating, and thus improving the installation stability of the external cable. Specifically, in this embodiment, the sheet metal part 12 can be confined within the receiving cavity Q through an interference fit; in other embodiments, the sheet metal part 12 can also be confined within the receiving cavity Q by screw fastening, adhesive bonding, snap-fitting, or other methods.

[0058] The terminal block 10 of this application has the advantages of simple and convenient operation, and the first connector 121 is not easy to fall off or rotate, and the installation stability of the external cable is relatively high.

[0059] In this embodiment, as Figure 1 The sheet metal part 12 also includes a sheet metal body 122, with a first connector 121 disposed on the sheet metal body 122. The connection method between the first connector 121 and the sheet metal body 122 is not limited. The sheet metal part 12 can be integrally formed, allowing the first connector 121 and the sheet metal body 122 to be connected to each other. Alternatively, the sheet metal body 122 and the first connector 121 can be prepared separately, and then connected by riveting, welding, or bonding. The connection method between the sheet metal body 122 and the first connector 121 is not limited here.

[0060] In this embodiment, the sheet metal body 122 and the accommodating cavity Q are adapted to each other, so that the sheet metal body 122 can be confined within the accommodating cavity Q. In this way, by means of the limiting relationship between the sheet metal body 122 and the accommodating cavity Q, the first connecting member 121 provided on the sheet metal body 122 will also be limited, thereby effectively reducing the possibility of the first connecting member 121 falling off and rotating, which is conducive to improving the installation stability of external cables.

[0061] In this embodiment, the sheet metal body 122 can be made of metal, and the first connector 121 can be made of metal, which will not be described in detail here.

[0062] In some embodiments, the first connector 121 is a connecting nut, wherein the terminal 201 of the conductive busbar 20, the external cable, and the connecting nut are fixedly connected by a connecting screw 13. That is, the connecting screw 13 is sequentially inserted through the external cable and the terminal 201 of the conductive busbar 20, and threadedly connected to the connecting nut, thereby realizing the connection between the external cable and the conductive busbar 20.

[0063] It is understood that the first connector 121 of this application is provided on the sheet metal body 122. With the limiting relationship between the sheet metal body 122 and the accommodating cavity Q, the first connector 121 provided on the sheet metal body 122 will also be limited. Therefore, when connecting the corresponding connecting screw 13, there is no need to additionally determine the position of the corresponding nut. The corresponding screw can be directly screwed in, which is simple to operate.

[0064] Furthermore, the sheet metal body 122 is confined within the accommodating cavity Q, which can effectively reduce the possibility of the first connecting piece 121 falling off and rotating, and facilitate the improvement of the installation stability of the connecting screw 13.

[0065] Figure 4 This is a schematic diagram of the structure of the second terminal block 11b in some embodiments of this application. Figure 5 This is a structural schematic diagram showing the corresponding receiving cavity Q exposed in some embodiments of this application for the second terminal block 11b.

[0066] See Figure 2 Combined with reference Figure 4 and Figure 5 As shown, in some embodiments, the accommodating cavity Q includes a top wall Q1. The side of the top wall Q1 facing away from the sheet metal part 12 is a conductive busbar overlapping surface m. The conductive busbar overlapping surface m is used to place the conductive busbar 20. It can be understood that the conductive busbar 20 is supported on the conductive busbar overlapping surface m and is opposite to the corresponding accommodating cavity Q, so as to facilitate the connection between the conductive busbar 20 and the sheet metal part 12 in the accommodating cavity Q.

[0067] A first through hole k1 is provided on the top wall Q1 at the position corresponding to the connecting nut. When installing the external cable, the connecting screw 13 passes through the external cable and the conductive busbar 20 in sequence, and passes through the top wall Q1 through the first through hole k1, and then continues to pass through and is threaded to the corresponding connecting nut to realize the connection between the conductive busbar 20 and the external cable.

[0068] In other words, the connecting screw 13 passes through the external cable, the terminal 201 of the busbar 20, and the first through hole k1, and then connects to the connecting nut. Thus, the connection between the external cable and the busbar 20 is achieved through the connecting screw 13 and the connecting nut.

[0069] See Figure 1 and Figure 3 As shown, in some embodiments, the sheet metal part 12 is further provided with a second connector 123, which is used to fix the conductive busbar 20. The second connector 123 fixes the position of the conductive busbar 20, reducing the risk of the conductive busbar 20 moving during the process of connecting external cables through the first connector 121, which could lead to unstable installation of the external cables.

[0070] The second connector 123 reduces the possibility of the conductive busbar 20 shaking, thereby improving the connection stability of the external cable.

[0071] In this embodiment, as Figure 1 The second connector 123 is provided on the sheet metal body 122 and can be integrally formed with the sheet metal 12. It can also be connected to the sheet metal 12 by riveting, welding or bonding, which will not be described in detail here.

[0072] In this embodiment, the second connector 123 can be made of metal, which will not be described in detail here.

[0073] Continue reading Figure 1 , Figure 2 and Figure 3 As shown, the second connector 123 is a fixing nut, and the fixing end 202 of the conductive busbar 20 is fixedly connected to the fixing nut by a fixing screw 14. That is, the fixing screw 14 passes through the fixing end 202 of the conductive busbar 20 and is threadedly connected to the fixing nut to achieve a fixed connection between the conductive busbar 20 and the terminal block 11, so as to keep the conductive busbar 20 stable during the connection of external cables, thereby improving the stability of the connection between the external cables and the conductive busbar 20.

[0074] In some embodiments, both the first connector 121 and the second connector 123 may be nut structures, so that the first connector 121 and the second connector 123 can respectively engage with the corresponding screws.

[0075] It is understood that the first connector 121 and the second connector 123 of this application are both provided on the sheet metal body 122. With the limiting relationship between the sheet metal body 122 and the accommodating cavity Q, the first connector 121 and the second connector 123 provided on the sheet metal body 122 will also be limited. Therefore, when connecting the corresponding fixing screw 14 and connecting screw 13, there is no need to additionally determine the position of the corresponding nut. The corresponding screw can be directly screwed in, which is simple to operate.

[0076] Furthermore, the sheet metal body 122 is confined within the accommodating cavity Q, which can effectively reduce the possibility of the first connector 121 falling off and rotating, as well as the possibility of the second connector 123 falling off and rotating, thus facilitating the improvement of the installation stability of the fixing screw 14 and the connecting screw 13.

[0077] Figure 4 This is a schematic diagram of the structure of the second terminal block 11b in some embodiments of this application. Figure 5 This is a structural schematic diagram showing the corresponding receiving cavity Q exposed in some embodiments of this application for the second terminal block 11b.

[0078] See Figure 2 Combined with reference Figure 4 and Figure 5 As shown, in some embodiments, the accommodating cavity Q includes a top wall Q1. The side of the top wall Q1 facing away from the sheet metal part 12 is a conductive busbar overlapping surface m. The conductive busbar overlapping surface m is used to place the conductive busbar 20. It can be understood that the conductive busbar 20 is supported on the conductive busbar overlapping surface m and is opposite to the corresponding accommodating cavity Q, so as to facilitate the connection between the conductive busbar 20 and the sheet metal part 12 in the accommodating cavity Q.

[0079] A second through hole k2 is provided at the position corresponding to the fixing nut on the top wall Q1. The fixing screw 14 passes through the conductive busbar 20, and through the second through hole k2 through the conductive busbar overlapping surface m, and then continues to pass through and is threaded to the corresponding fixing nut, so as to realize the connection between the conductive busbar 20 and the sheet metal part 12, so as to fix the conductive busbar 20 on the conductive busbar overlapping surface m.

[0080] In other words, the fixing screw 14 passes through the fixing end 202 and the second through hole k2 of the conductive busbar 20 and is connected to the fixing nut. In this way, the connection between the conductive busbar 20 and the sheet metal part 12 is achieved through the fixing screw 14 and the fixing nut.

[0081] Continue reading Figure 2 As shown, in some embodiments, the accommodating cavity Q includes a top wall Q1, and the side of the top wall Q1 facing away from the sheet metal part 12 is a conductive busbar overlapping surface m, which is used to place the conductive busbar 20.

[0082] A positioning pin 112 is provided on the contact surface m of the conductive busbar. The positioning pin 112 is used to improve the positioning accuracy of the conductive busbar 20 relative to the terminal block 11.

[0083] Furthermore, the conductive busbar 20 is provided with a positioning hole opposite to the positioning pin 112, so that the conductive busbar 20 can be positioned by inserting the positioning pin 112 into the positioning hole. In this way, the conductive busbar 20 can be accurately positioned at the corresponding position on the conductive busbar overlapping surface m, which helps to improve the positioning accuracy of the conductive busbar 20 relative to the terminal block 11.

[0084] In this embodiment, multiple positioning pins 112 and multiple corresponding positioning holes can be provided. By having multiple positioning pins 112 and multiple positioning holes correspond one-to-one, the conductive busbar 20 can be accurately installed at the corresponding position on the conductive busbar overlapping surface m, thereby further improving the positioning accuracy of the conductive busbar 20 relative to the terminal block 11.

[0085] like Figure 5 As shown, in some embodiments, the inner wall of the accommodating cavity Q includes a guide wall Q2, which is located at the opening of the accommodating cavity Q and provides guidance for the process of inserting the sheet metal part 12 into the accommodating cavity Q.

[0086] Define a first axis L parallel to the direction along the opening toward the cavity Q. The first axis L passes through the cavity Q, or in other words, the first axis L is located inside the cavity Q. During the insertion of the sheet metal part 12 into the cavity Q, the sheet metal part 12 moves along the extension direction of the first axis L and is inserted into the cavity Q.

[0087] Along the direction from the opening toward the receiving cavity Q, the distance between the guide wall Q2 and the first axis L gradually decreases. This design allows the guide wall Q2 to provide guidance during the insertion of the sheet metal part 12, facilitating the quick and smooth insertion of the sheet metal part 12 into the receiving cavity Q.

[0088] Continue reading Figure 5 In some embodiments, the accommodating cavity Q includes a top wall Q1 and a limiting wall Q3 opposite each other along the first direction F1. The sheet metal part 12 is limited between the top wall Q1 and the limiting wall Q3, thus limiting the sheet metal part 12 by the accommodating cavity Q. Furthermore, by utilizing the limiting relationship between the sheet metal part body 122 and the accommodating cavity Q, the first connecting member 121 provided on the sheet metal part body 122 is also limited, thereby effectively reducing the possibility of the first connecting member 121 detaching or rotating.

[0089] Furthermore, the setting of the limiting wall Q3 enables the space between the top wall Q1 and the limiting wall Q3 to provide a guiding function for the sheet metal part 12, improving the alignment of the nut and the corresponding through hole on the sheet metal part 12 during the insertion process, thereby improving the accuracy and stability of the sheet metal part 12 being inserted into the receiving cavity Q.

[0090] In this embodiment, the limiting wall Q3 is provided with a protrusion 111 facing the top wall Q1. The protrusion 111 abuts against one side of the sheet metal part 12, which helps to improve the installation firmness of the sheet metal part 12 between the top wall Q1 and the limiting wall Q3, thereby reducing the risk of the sheet metal part 12 slipping, and also improving the vibration resistance and impact resistance of the sheet metal part 12.

[0091] In this embodiment, the inner wall of the accommodating cavity Q includes two limiting walls Q3. The two limiting walls Q3 are spaced apart from each other along the second direction F2 and are respectively located on opposite sides of the top wall Q1 along the second direction F2. Each of the two limiting walls Q3 has a corresponding protrusion 111. Through the two protrusions 111, multiple limiting measures can be applied to the sheet metal part 12, which helps to further improve the limiting strength of the sheet metal part 12.

[0092] Figure 6 This is a cross-sectional view of the second terminal block 11b in some embodiments of this application.

[0093] See Figure 6 As shown, in some embodiments, there is a draft angle between the top wall Q1 and the limiting wall Q3. That is, along the first axis L and in the direction of the opening toward the cavity Q, the radial dimension of the cavity Q gradually decreases, so that when the sheet metal part 12 is inserted into the cavity Q, the compression between it and the inner wall of the cavity Q becomes tighter and tighter. After the sheet metal part 12 is fully inserted, it can be tightly locked in the cavity Q of the plastic terminal 10, reducing the risk of the sheet metal part 12 falling out.

[0094] Continue reading Figure 5 In some embodiments, the inner wall of the accommodating cavity Q further includes a stepped wall Q4 and a bottom wall Q5. The stepped wall Q4 is supported by the first connector 121 and serves to support the first connector 121.

[0095] A stepped wall Q4 is located on the side of the limiting wall Q3 away from the top wall Q1, and a bottom wall Q5 is located on the side of the stepped wall Q4 away from the limiting wall Q3. The first connecting member 121 is located between the limiting wall Q3 and the stepped wall Q4. Thus, when the sheet metal part 12 is inserted into the receiving cavity Q, the stepped wall Q4 abuts against the side of the first connecting member 121 away from the sheet metal part body 122, providing support for the first connecting member 121. This supports the first connecting member 121 through the stepped wall Q4, which helps to reduce the resistance when the sheet metal part 12 is inserted into the receiving cavity Q, allowing the sheet metal part 12 to move smoothly and be confined within the receiving cavity Q.

[0096] It is understood that in some embodiments, the first connector 121 is a connecting nut, wherein the terminal 201 of the conductive bus 20, the external cable, and the connecting nut are fixedly connected by a connecting screw 13. In this case, the space between the bottom wall Q5 and the stepped wall Q4 is sufficient to ensure that the threaded length protruding when the screw is tightened will not interfere with the bottom wall Q5.

[0097] See Figures 2-6 As shown, in some embodiments, the terminal block 11 has at least two receiving cavities Q, and the wiring terminal 10 includes at least two sheet metal parts 12, each corresponding to one of the at least two receiving cavities Q. This allows for the provision of multiple wiring ports, facilitating the connection of multiple external cables.

[0098] Furthermore, at least two accommodating cavities Q are spaced apart from each other along the second direction F2, and each accommodating cavity Q includes a top wall Q1, the side of the top wall Q1 facing away from the sheet metal part 12 being a conductive busbar contact surface m. Each external cable is respectively installed on the conductive busbar 20 on the corresponding conductive busbar contact surface m.

[0099] Therefore, the arrangement of at least two accommodating cavities Q and at least two sheet metal parts 12 in this application enables the terminal block 11 to connect at least two or more types of external cables. This allows for the simultaneous connection of multiple different types of cables, fulfilling various wiring requirements.

[0100] In this embodiment, the terminal block 10 further includes a partition 113, which is disposed between the overlapping surfaces m of two adjacent conductive bars. Thus, the partition 113 achieves electrical isolation between adjacent conductive bars 20, improving the safety and reliability of the system.

[0101] Figure 7 This is a schematic diagram of the structure of the terminal block 10 in some other embodiments of this application. Figure 8 This is a schematic diagram of the wiring terminal 10 installed inside the chassis 30 in some other embodiments of this application. Figure 9 This is a cross-sectional view of the terminal block 10 in some other embodiments of this application.

[0102] See Figure 7 , Figure 8 and Figure 9 As shown, in some embodiments, the terminal block 11 includes a first terminal block 11a and a second terminal block 11b, and the first terminal block 11a and the second terminal block 11b partially overlap along the first direction F1.

[0103] In this embodiment, the first terminal block 11a and the second terminal block 11b can overlap without gaps along the first direction F1, that is, the first terminal block 11a directly overlaps the second terminal block 11b. When an external cable is installed and a force is applied to the first terminal block 11a, the deformation of the plastic terminal block 11 itself can buffer this part of the force.

[0104] In other embodiments, the first terminal block 11a and the second terminal block 11b partially overlap along the first direction F1 and have a preset interval along the first direction F1. In this case, the preset interval refers to the interval between the conductive bars 20 of the first terminal block 11a and the second terminal block 11b along the first direction F1. When an external cable is installed and a force is applied to the first terminal block 11a, this portion of the force can be buffered by the preset interval.

[0105] In this embodiment, the preset interval can be 0.2mm, which is a better preset interval. This helps to better buffer the force applied by the external cable to the first terminal block 11a and reduce the pressure on the first terminal block 11a.

[0106] In other embodiments, a partition 113 is provided on the second terminal block 11b, and the first terminal block 11a and the second terminal block 11b can overlap without gap along the first direction F1, that is, the first terminal block 11a directly overlaps the partition 113 of the second terminal block 11b. In this case, when an external cable is installed and a force is applied to the first terminal block 11a, the terminal block 11a itself can deform relative to the partition 113 to buffer the force.

[0107] In other embodiments, a partition 113 is provided on the second terminal block 11b, and the first terminal block 11a and the second terminal block 11b can overlap with a preset interval along the first direction F1. In this case, the preset interval refers to the interval between the first terminal block 11a and the partition 113 along the first direction F1. In this case, when an external cable is installed and a force is applied to the first terminal block 11a, the preset interval can buffer part of the force.

[0108] The preset interval can be 0.2mm, so as to better buffer the force applied by the external cable to the first terminal block 11a.

[0109] The terminal block 10 of this application, by providing two terminal blocks 11, can meet wiring requirements. The wiring positions for different types of cables can be arranged accordingly. For example, the conductive bar 20 corresponding to the first terminal block 11a can be used to electrically connect external first-type cables, and the conductive bar 20 corresponding to the second terminal block 11b can be used to connect external second-type cables. The first-type and second-type cables can be different types of cables or the same type of cable; the specific arrangement can be set according to actual needs. In this way, the terminal block 10 can connect multiple different types of cables simultaneously. Furthermore, the second terminal block 11b partially overlaps with the first terminal block 11a, thereby reducing the size of the terminal block 10, minimizing its space occupation in the frequency converter, and meeting the requirements for compact installation.

[0110] See Figure 7 , Figure 8 and Figure 9 As shown, in some embodiments, the first terminal block 11a includes a main board and side plates. Along the second direction F2, the two side plates are disposed on opposite sides of the main board, and the main board and the two side plates together define a receiving space. Along the first direction F1, the projection of a portion of the second terminal block 11b overlaps with the projection of at least a portion of the first terminal block 11a. Thus, compared to the two terminal blocks 11 being arranged side by side, this application is advantageous in improving the compact layout between the two terminal blocks 11 and in reducing the volume of the wiring terminal 10.

[0111] like Figure 7 The first terminal block 11a is provided with a plurality of first fixing holes k3, and the second terminal block 11b is provided with a plurality of second fixing holes k4. The wiring terminal 10 also includes a plurality of first fixing members, a plurality of second fixing members and a third fixing member. The first fixing member passes through the first fixing hole k3 and is used to fix the first terminal block 11a to the chassis 30 or to the external structure. The second fixing member passes through the second fixing hole k4 and is used to fix the second terminal block 11b to the chassis 30 or to the external structure.

[0112] It is understood that the first terminal block 11a and the second terminal block 11b partially overlap along the first direction F1. The first fixing hole k3 of the overlapping part of the first terminal block 11a and the second fixing hole k4 of the second terminal block 11b overlap and are opposite to each other. Thus, the third fixing member is sequentially inserted into the overlapping and opposite first fixing hole k3 and second fixing hole k4 to simultaneously fix the first terminal block 11a and the second terminal block 11b to the chassis 30 or to the external structure, thereby realizing the connection between the first terminal block 11a and the second terminal block 11b.

[0113] In this embodiment, the first, second, and third fixing members can all be bolts or similar structures, and no further restrictions are imposed.

[0114] like Figure 3 , Figure 7 and Figure 9 As shown, in some embodiments, the first terminal block 11a further includes a reinforcing member 114 that extends toward the second terminal block 11b along a first direction F1. The reinforcing member 114 can improve the strength of the first terminal block 11a.

[0115] Continue reading Figure 7 and Figure 9As shown, in this embodiment, the reinforcing member 114 and the second terminal block 11b have a preset distance along the first direction F1. That is, when the first terminal block 11a and the second terminal block 11b are partially overlapped, the reinforcing member 114 can be configured to face the second terminal block 11b and have a certain distance from the second terminal block 11b along the first direction F1. This certain distance is the distance between the conductive bars 20 of the reinforcing member 114 and the second terminal block 11b along the first direction F1.

[0116] Furthermore, in this embodiment, the gap can be 0.5mm. In this way, in the event of vibration, impact or other usage scenarios, when the conductive bar 20 of the second terminal block 11b tilts upward, the reinforcing member 114 can limit the corresponding conductive bar 20, reducing the risk of it tilting upward.

[0117] It is also understood that when the corresponding cable is plugged in, there is pressure applied to the first terminal block 11a toward the second terminal block 11b. At this time, the second terminal block 11b provides a certain support force to the first terminal block 11a through the reinforcing member 114, which helps to improve the stability of the plugged cable.

[0118] like Figure 6 As shown, in some embodiments, the second terminal block 11b further includes a support member 115, which extends outward from the first terminal block 11a along a first direction F1. The support member 115 is used to support the second terminal block 11b, such that there is a certain gap between the bottom of the second terminal block 11b and the mounting surface of the external structure.

[0119] It is understood that the terminal block 10 can be mounted on the chassis 30 or an external structure. If there are electrical components on the mounting surface of the chassis 30 or the external structure used to mount the terminal block 10, the support member 115 of this application provides a certain gap between the bottom of the second terminal block 11b and the mounting surface of the external structure. This gap provides space for the electrical components on the mounting surface, reducing the possibility of the terminal block 10 pressing against the electrical components on the mounting surface. In other words, the support member 115 is designed to adapt to the construction of the mounting surface of the external structure, facilitating the installation of the terminal block 10 in different external installation environments. The specific position of the support member 115 can be set according to the construction of different external installation environments in actual applications, without excessive restrictions.

[0120] Among them, electrical components can be power devices or other structures, which will not be elaborated here.

[0121] In some embodiments, there is a relative gap between the bottom of the support member 115 and the external mounting position. It is understood that when connecting external cables, downward pressure is exerted on the second terminal block 11b, causing the second terminal block 11b to deform under downward pressure. At this time, the relative gap at the bottom of the support member 115 can buffer this pressure, alleviate the impact force brought by the support member 115 abutting against the chassis 30 or external structure on the external mounting position, reduce the damage to the bottom of the second terminal block 11b, and reduce the damage to the chassis 30 or external structure.

[0122] The relative gap can be 0.2mm, which is beneficial for buffering the downward pressure during installation and for ensuring that the support 115 can provide timely support, thereby reducing the risk of damage to the housing 30 or external structure caused by the bottom of the second terminal block 11b pressing against it.

[0123] like Figure 2 In some embodiments, the terminal block 11 includes a magnetic ring mounting portion 116, which is located outside the accommodating cavity Q and is used to mount a magnetic ring. The magnetic ring is used to suppress electromagnetic interference. It can be understood that when the frequency converter is operating, a high-frequency pulse current is generated internally. The magnetic ring exhibits high impedance characteristics at high frequencies, converting high-frequency noise energy into heat energy and dissipating it, thereby blocking the propagation of interference lines and suppressing electromagnetic interference.

[0124] The terminal block 10 of this application can be applied to a frequency converter. The frequency converter includes a chassis 30, a busbar 20, and the terminal block 10. The terminal block 10 is installed inside the chassis 30. One end of the busbar 20 is connected to the components of the frequency converter, and the other end is connected to an external cable through the terminal block 10. By using the aforementioned terminal block 10, the frequency converter can ensure the reliability of the connection to the external cable, while also reducing its size.

[0125] In this embodiment, the chassis 30 has an external window that exposes part of the structure of the terminal block 10. When the terminal block 10 is installed inside the chassis 30, the projection of the chassis 30 along the first direction F1 coincides with the projection of the fixed end 202 of the conductive busbar 20 of the first terminal block 11a along the first direction F1. That is, the chassis 30 blocks the fixed end 202 of the conductive busbar 20 of the first terminal block 11a and exposes the terminal block 201 of the conductive busbar 20 of the first terminal block 11a. In this way, the fixing screw 14 is blocked, while the connecting screw 13 or the first through hole k1 is exposed, which makes it easy for the user to find the position of the external cable connected to the first terminal block 11a in time, and plays a role in preventing wiring mistakes.

[0126] Furthermore, the second terminal block 11b partially overlaps with the first terminal block 11a, and the fixing bolt of the conductive busbar 20 corresponding to the second terminal block 11b is located at the position where the second terminal block 11b and the first terminal block 11a overlap. In this way, the fixing end 202 of the conductive busbar 20 of the second terminal block 11b is blocked by the first terminal block 11a, while the wiring end 201 of the conductive busbar 20 of the second terminal block 11b is exposed. Thus, the fixing screw 14 is blocked, while the connecting screw 13 or the first through hole k1 is exposed, making it easier for the user to find the position of the external cable connected to the second terminal block 11b in a timely manner, thus playing a role in preventing wiring mistakes.

[0127] In this embodiment, as Figure 8 The electrical connectors on the chassis 30 corresponding to the first terminal block 11a and the second terminal block 11b are marked, such as... Figure 8 The markings "R", "S", "T", and "U" on the intermediate chassis 30 facilitate the installation of different cables. The conductive busbar 20 can be configured as an aluminum busbar for installing AC input R, S, T and AC output U, V, W, etc., or as a PE grounding busbar for grounding; no further restrictions are imposed here.

[0128] The terminal block 10 and frequency converter of this application can connect the busbar 20 and external cables through the first connector 121, simplifying the structure of the terminal block 10. The sheet metal part 12 is adapted to the receiving cavity Q and confined within the cavity Q, thus minimizing the possibility of the first connector 121 detaching or rotating during use, improving the reliability of the external cable connection. This application also achieves multi-channel electrical connection by providing a first terminal block 11a and a second terminal block 11b, suitable for different external cable connection scenarios. Furthermore, the second terminal block 11b overlaps with the first terminal block 11a, effectively reducing the overall volume, improving space utilization, and meeting the requirements of miniaturized installation. The design of the receiving cavity Q and guide wall Q2 allows the sheet metal part 12 to be quickly inserted and stably installed without detachment, facilitating the installation of external wiring on-site. This application also utilizes the first connector 121 and the second connector 123 to achieve multiple fixings, enhancing the connection strength between the conductive busbar 20 and external cables, improving the vibration and shock resistance of the terminal block 10, and ensuring its long-term stable operation. The design of the partition 113 in this application effectively isolates adjacent conductive busbars 20, reducing electrical interference or short circuits and improving the safety of the frequency converter. Furthermore, this application can configure multiple conductive busbars 20 according to actual needs, supporting various cable specifications and connection methods to adapt to different power levels and application scenarios. This application also achieves a stable connection between the terminal block 10 and the chassis 30 or external structure through fixing holes and support members 115, enhancing the overall stability of the system.

[0129] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0130] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A terminal block, characterized in that, The terminal block includes: Terminal block, the terminal block having a receiving cavity; and A sheet metal part is disposed within the accommodating cavity. The sheet metal part includes a first connector for connecting to a conductive busbar and an external cable.

2. The terminal block according to claim 1, characterized in that, The first connector is a connecting nut, and the terminals of the conductive busbar, the external cable, and the connecting nut are fixedly connected by connecting screws.

3. The terminal block according to claim 2, characterized in that, The accommodating cavity includes a top wall, and a first through hole is provided on the top wall at a position corresponding to the connecting nut. The connecting screw passes through the terminal of the conductive busbar, the external cable, the first through hole, and connects to the connecting nut.

4. The terminal block according to claim 1, characterized in that, The sheet metal part is also provided with a second connector, which is used to fix the conductive busbar.

5. The terminal block according to claim 4, characterized in that, The second connector is a fixing nut, and the fixing end of the conductive busbar is fixedly connected to the fixing nut by a fixing screw.

6. The terminal block according to claim 5, characterized in that, The accommodating cavity includes a top wall, and a second through hole is provided on the top wall at the position corresponding to the fixing nut. The fixing screw passes through the fixing end of the conductive busbar and the second through hole and is connected to the fixing nut.

7. The terminal block according to claim 1, characterized in that, The accommodating cavity includes a top wall, and the side of the top wall opposite to the sheet metal part is a conductive bar overlap surface. The conductive bar overlap surface is used to place the conductive bar. A positioning pin is provided on the conductive bar overlap surface, and a positioning hole is provided on the conductive bar opposite to the positioning pin, so as to position the conductive bar by inserting the positioning pin into the positioning hole.

8. The terminal block according to claim 1, characterized in that, The accommodating cavity includes a guide wall located at the opening of the accommodating cavity. A first axis is defined parallel to the direction along the opening toward the interior of the accommodating cavity. The first axis passes through the accommodating cavity. The distance between the guide wall and the first axis gradually decreases along the direction along the opening toward the interior of the accommodating cavity.

9. The terminal block according to claim 1, characterized in that, The accommodating cavity includes a top wall and a limiting wall opposite each other along a first direction; the limiting wall has a protrusion facing the top wall, and the sheet metal part is limited between the top wall and the limiting wall; and / or There is a draft angle between the top wall and the limiting wall.

10. The terminal block according to claim 9, characterized in that, The accommodating cavity further includes a stepped wall and a bottom wall. The stepped wall is located on the side of the limiting wall away from the top wall, and the bottom wall is located on the side of the stepped wall away from the limiting wall. The first connecting member is located between the limiting wall and the stepped wall.

11. The terminal block according to claim 1, characterized in that, The terminal block has at least two accommodating cavities, the wiring terminal includes at least two sheet metal parts, and the at least two sheet metal parts correspond one-to-one with the at least two accommodating cavities. The at least two accommodating cavities are spaced apart from each other along a second direction. Each accommodating cavity includes a top wall, and the side of the top wall facing away from the sheet metal part is a conductive busbar contact surface. The terminal block also includes a partition, which is disposed between the overlapping surfaces of two adjacent conductive bars.

12. The terminal block according to claim 1, characterized in that, The terminal block includes a first terminal block and a second terminal block, which partially overlap along a first direction.

13. The terminal block according to claim 12, characterized in that, The first terminal block further includes a reinforcing member that extends toward the second terminal block along the first direction.

14. The terminal block according to claim 13, characterized in that, Along the first direction, the reinforcing member and the second terminal block have a predetermined distance.

15. The terminal block according to claim 12, characterized in that, The second terminal block also includes a support member that extends outward from the first terminal block along the first direction.

16. The terminal block according to claim 1, characterized in that, The terminal block includes a magnetic ring mounting part, which is located outside the accommodating cavity and is used to mount a magnetic ring.

17. A frequency converter, characterized in that, The frequency converter includes a chassis, a busbar, and a terminal block as described in any one of claims 1 to 16. The terminal block is installed in the chassis, one end of the busbar is connected to a device of the frequency converter, and the other end is connected to an external cable through the terminal block.

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