CN209692622U - Output terminal and current transformer - Google Patents

Abstract

It includes backboard, magnet ring and multiple binding posts that the utility model embodiment, which provides a kind of output terminal and current transformer, the output terminal, in which: the multiple binding post is each passed through the backboard, and is fixedly connected with the backboard；The multiple binding post mutually insulated, and the first end of each binding post is located at the first side of the backboard, second end is located at second side of the backboard；The magnet ring to be fixedly connected on the backboard in a manner of the multiple binding post, and the magnet ring protrude from second side of the backboard size be less than the binding post second end protrude from the backboard second side size.The utility model embodiment is by the way that binding post and magnet ring to be integrated on backboard, the water proof and dust proof of output terminal can be realized without Glan, without dismantle converter box can butted line point checked, facilitate the installation and maintenance of output terminal, and it no longer needs to carry out individual magnet ring installation, reduces the requirement to installation space.

Description

Output terminal and converter

technical field

The utility model relates to the field of power electronic equipment, in particular to an output terminal and a converter.

Background technique

As a power conversion device, the converter has been widely used in power electronic equipment. The final output of the converter is AC or DC, and currently the converter usually uses a transfer copper bar or directly uses a cable crimped with a connection terminal (such as an OT terminal) to output power.

When two or more outputs are required, the converter outputs electric energy by opening holes in the transfer copper bar or directly setting multiple openings on the busbar body, and using multiple cables. In this two-way or multi-way output structure, the busbar body or the transfer copper bar is fixed on the box body or other structural parts through insulating parts, and the cables are directly tied with cable ties inside the box body.

However, when using a structure in which a cable crimped with a connection terminal is directly connected to the busbar body, on the one hand, it is easy to make the busbar body bear the extra force of the cable: since the cable is generally thick in diameter, the bending radius is relatively large. In a small case, the stress of the cable itself will be transmitted to the connecting part of the busbar body, causing the busbar body to bear a large stress, and in severe cases, it may damage the power devices connected to the busbar. Moreover, in this connection structure, if the openings on the busbar body are not handled properly, it is easy to cause uneven current distribution, serious local heating, and lower power quality.

The power output structure combined with the transfer copper busbar cable can relieve the stress on the busbar body to a certain extent, but during installation, it is usually required that the cable outlet part is waterproof and dustproof (the protection level must reach IP54 or higher) , in order to achieve the above effects, it is usually necessary to pass the cable through the gland (that is, the waterproof plug). Specifically, after the cables are connected inside the chassis, the gland plate needs to be installed in the chassis, and the gland cap should be tightened, so as to realize the waterproof function. In many cases, it is necessary to frequently check the outgoing parts of the cables, and the above-mentioned connection method needs to frequently disassemble the gland cap and the gland plate during the inspection, resulting in reduced inspection efficiency and reduced service life of the gland cap.

In addition, the output of the converter needs to use a magnetic ring to suppress common-mode interference. The usual method is to pass the cable through the circular magnetic ring and use a cable tie to bind the magnetic ring to the cable. Since the cables need to pass through the same magnetic ring and then disperse out of the box, the required installation and operation space is relatively large. Especially for the converters powered by traction motors, it is generally necessary to carry out wiring work on the vehicle body. The cumbersome operation steps increase the labor intensity and reduce the operation efficiency. In addition, the required operation space is large, and a large operation and maintenance space needs to be reserved. The maintenance space is not conducive to the optimization of the overall layout of the car body.

Contents of the invention

The embodiment of the utility model aims at that when the cable output is directly used in the above-mentioned converter, the busbar body bears a large stress, which is likely to cause uneven current distribution, and the inspection efficiency is low when the output is combined with the transfer copper bar and the cable. 1. To solve the problem of cumbersome operation, an output terminal and a converter are provided.

The technical solution of the embodiment of the present invention to solve the above-mentioned technical problems is to provide an output terminal, including a backboard, a magnetic ring and a plurality of terminal posts, wherein: the multiple terminal posts pass through the backboard respectively, and are connected to the The backplane is fixedly connected; the plurality of binding posts are insulated from each other, and the first end of each of the binding posts is located on the first side of the backplane, and the second end is located on the second side of the backplane; The magnetic ring is fixedly connected to the backplane in a manner of surrounding the plurality of terminals, and the size of the magnetic ring protruding from the second side of the backplane is smaller than that of the second end of the terminal. on the second side of the backplane.

Preferably, the radial section of the magnetic ring is elliptical, and is fixed on the second side of the backboard by screws, and the central axis of the magnetic ring and the central axis of the terminal are respectively perpendicular to the backplane.

Preferably, the backplane is made of insulating material, the output terminal further includes a plastic casing, and the plastic casing is placed outside the magnetic ring, and the second end of the terminal is exposed outside the plastic casing.

Preferably, the backplane, the terminal, and the magnetic ring are packaged as a whole by hot-melt adhesive.

The embodiment of the utility model also provides a converter, including a casing, an output copper bar, and the above-mentioned output terminal; wherein: the output copper bar is installed in the casing; the casing has a terminal port, and the shape and size of the terminal port match the shape and size of the back plate of the output terminal; the output terminal is sealed and fixed on the terminal port of the casing, and the output copper bar passes through the conductive connector Connect to the binding posts of the output terminals.

Preferably, the conductive connector includes a transfer copper bar and a shunt bus bar, and the transfer copper bar and the shunt bus bar are respectively installed in the casing; the second side of the shunt bus bar faces the output terminal fixed on the output terminal, and the shunt busbar is electrically connected to the terminal; the first end of the transfer copper bar is fixedly connected to the output copper bar, and the second end is fixedly connected to the the first side of the shunt busbar.

Preferably, the output copper bar includes multi-phase output openings, the shunt bus bar includes multiple copper plates separated by insulating materials, and each phase output opening of the output copper bar passes through one of the transfer copper The row is conductively connected with a piece of copper plate of the shunt busbar.

Preferably, the shunt busbar has a mounting hole group composed of a plurality of conductive seats, and each of the conductive seats is conductively connected with a piece of copper plate of the shunt busbar; each of the conductive seats has a mounting hole group holes, and the second end of each transfer copper bar is connected and fixed to one of the conductive seats by screws.

Preferably, each binding post in the output terminal is fixedly connected to one of the conductive seats through a fixing screw.

Preferably, the shunt busbar includes a plurality of the installation hole groups, the casing has a plurality of the terminal ports, and the converter includes a plurality of the output terminals; each of the output The terminal is sealed and fixed on one of the terminal openings, and the binding post in each of the output terminals is connected to a mounting hole group of the shunt busbar.

The output terminal and the converter of the embodiment of the utility model, by integrating the terminal and the magnetic ring into the backboard, can realize the waterproof and dustproof of the output terminal without using the gland, and can be installed without disassembling the converter box. Checking the wiring points facilitates the installation and maintenance of the output terminals, and does not need to install a separate magnetic ring, which reduces the requirements for installation space.

Description of drawings

Fig. 1 is a schematic structural diagram of an output terminal provided by an embodiment of the present invention;

Fig. 2 is a schematic cross-sectional structure diagram of the output terminal in Fig. 1 along the line A-A;

Fig. 3 is a schematic structural diagram of a converter provided by an embodiment of the present invention;

Fig. 4 is a schematic diagram of the lateral structure of the converter provided by the embodiment of the present invention;

Fig. 5 is a schematic structural diagram of the transfer copper bar in the converter provided by the embodiment of the present invention;

Fig. 6 is a schematic structural diagram of the shunt busbar in the converter provided by the embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

As shown in Figure 1-2, it is a schematic structural diagram of the output terminal provided by the embodiment of the present invention, and the output terminal can be applied to the power output of power electronic equipment such as a converter. The output terminal in this embodiment includes a backplane 11, a magnetic ring 12, and a plurality of binding posts 13 (the number of binding posts 13 can be adjusted according to the application scene of the output terminal, for example, when the output terminal is used to output three-phase electric energy, the output The terminal may comprise three terminals 13). The plurality of terminal posts 13 respectively pass through the backplane 11 and are fixedly connected to the backplane 11 (in order to achieve a higher protection level, the connection between the backplane 11 and the terminal post 13 is sealed); the multiple terminal posts 13 can realize a Group electric energy output (for example, when used for three-phase electric energy output, the output terminal includes three terminal posts 13, and each terminal post 13 is used to connect one phase output). After being installed on the backplane 11, the plurality of terminal posts 13 are insulated from each other (the spacing between the terminal posts 13 needs to be greater than the safety distance to meet the insulation and safety requirements), and the first end of each terminal post 13 Located on the first side of the backplane 11, the second end is located on the second side of the backplane 11; the magnetic ring 12 is fixedly connected to the backplane 11 in a manner surrounding a plurality of binding posts 13 (that is, the plurality of binding posts 13 pass through the magnetic The central through hole of the ring 12 ), and the size of the magnetic ring 12 protruding from the second side of the back plate 11 is smaller than the size of the second end of the terminal post 13 protruding from the second side of the back plate 11 .

By integrating the terminal 13 into the back panel 11, the above-mentioned output terminal can realize the waterproof and dustproof of the output terminal without the need of a gland, so that when checking the wiring point position, it is only necessary to remove the output terminal without disassembly It is not necessary to dismantle the gland caps frequently for the converter box, which facilitates the installation and maintenance of the output terminals. And because the magnetic ring 12 is integrated on the backplane 11, it can suppress the common-mode interference of the output AC, meet the requirements of electromagnetic compatibility (Electro Magnetic Compatibility, EMC) for interference, improve the power quality, and do not need to carry out a separate operation inside the converter. The magnetic ring installation reduces the requirement for installation space.

Specifically, the first end of the terminal 13 may have a first screw hole 131, so as to realize the connection of the internal output copper bar of the converter; the second end of the terminal 13 may have a second screw hole 132, so as to facilitate Wiring of electrical equipment. Moreover, in the above output terminal, in order to better suppress the common mode interference of each phase output, the radial cross section of the above magnetic ring 12 can be in the form of an elliptical ring, and this structure can also save the volume of the output terminal. Since the magnetic ring 12 itself is heavy, it is fixed on the second side of the backboard 11 by screws to ensure the stable fixing of the magnetic ring 12 . Moreover, the central axis of the magnetic ring 12 and the central axis of the terminal 13 can be respectively perpendicular to the back plate 11, so as to facilitate external wiring.

In order to make the output terminal have better insulation performance, the above-mentioned back plate 11 can be made of insulating material, and the output terminal also includes a plastic casing 14 . The plastic casing 14 can be sleeved on the outside of the magnetic ring 12 , and the second end of the terminal 13 is exposed to the outside of the plastic casing 14 .

In addition, the back plate 11 , the terminal post 13 and the magnetic ring 12 are encapsulated as a whole by hot melt adhesive, thereby greatly improving the integrity of the output terminal and improving the safety level.

As shown in Fig. 3-4, it is a schematic diagram of the converter provided by the embodiment of the present invention. The converter can be a frequency converter, an inverter, etc., and it can output AC power to electrical equipment. The converter of this embodiment includes a casing 40, an output copper bar 43, and the output terminals as described above. Wherein, the above-mentioned output copper bars are installed in the casing 40 and connected to the AC output end of the power unit 42 . There is a terminal port on the casing 40 (such as the front panel, back plate or side plate of the casing 40), and the shape and size of the terminal port match the shape and size of the back plate 11 of the output terminal; the output terminal is sealed and fixed on the machine The terminal port of the shell 40 (for example, the backplane 11 is fixed to the casing 40 through the screws 15 passing through the fixing holes 111 on the backplane 11, and a sealing gasket can be provided between the backplane 11 and the casing 40), the output copper bar 43 is connected to the first end of the terminal post 13 of the output terminal through a conductive connector. In this way, the external electrical equipment can be connected to the second end of the terminal 13 through a cable (such as a cable crimped with an OT terminal) and a screw 16 to realize the power supply output of the converter.

In order to protect the output terminals, a junction box 50 can be provided outside the casing 40, and the cover plate on the junction box 50 can only be opened when performing wiring operations.

The above-mentioned converter leads the AC output of the power unit 42 to the outside of the casing 40 through the output terminals, and at the same time suppresses the common-mode interference of the AC output through the magnetic ring 12, that is, the output terminals can realize common-mode interference suppression while realizing sealed wiring .

Specifically, the above-mentioned conductive connector may include a transfer copper bar 31 and a shunt bus bar 20 , and the transfer copper bar 31 and the shunt bus bar 20 are respectively installed in the casing 40 . The above-mentioned shunt busbar 20 is fixed on the output terminal with the second side facing the output terminal, and the shunt busbar 20 is conductively connected with the terminal post 13 of the output terminal. The first end of the transfer copper bar 31 is fixedly connected to the output copper bar 43 , and the second end is fixedly connected to the first side of the distribution bus bar 20 .

The output copper bar 43 may include multi-phase output openings, and each phase output opening is used to connect a phase output. Correspondingly, the shunt busbar 20 includes a plurality of copper plates separated by insulating materials, and the output opening of each phase of the output copper bar 43 is conductively connected with a piece of copper plate of the shunt busbar 20 through a transfer copper bar 31 . For example, when the converter outputs U, V, and W three-phase electric energy, the output copper bar 43 includes U phase, V phase, and W phase three-phase output, and the conductive connection structure includes three transfer copper bars 31, and the shunt bus bar 20 It includes three copper plates, and each of the U phase, V phase and W phase of the output copper bar 43 is conductively connected to a copper plate of the shunt bus bar 20 through a transfer copper bar 31 .

Referring to Fig. 5, the transfer copper bar 31 can be L-shaped as a whole, and the first end of the transfer copper bar 31 has a rivet nut or welding nut 312, and the second end can have a through hole 311. , the first end of the transfer copper bar 31 is fixed on a phase output opening of the output copper bar 43 by a screw 32 (the screw 32 is threaded to a rivet nut or a welding nut 312 ), and the transfer copper bar 31 The second end is fixed on the shunt busbar 20 by a screw (the screw passes through the through hole 311 ). The above structure can avoid stress on the output copper bar 43 and prevent the output copper bar 43 from being damaged.

6, the shunt busbar 20 has a mounting hole group consisting of a plurality of conductive seats 201, and each conductive seat 201 is conductively connected to a piece of copper plate of the shunt busbar 20 (multiple conductive holes in the same installation hole group The seat 201 is electrically connected to the copper plate in the shunt busbar 20 in a one-to-one correspondence manner). Each conductive seat 201 has a mounting hole (which may be a screw hole or a through hole), and the second end of each transfer copper bar 31 is connected and fixed to one conductive seat 201 by screws.

In particular, after the fixing screw 22 used to connect the transfer copper bar 31 and the shunt bus bar 20 passes through the through hole 311 at the second end of the transfer copper bar 31 and the through hole on the conductive seat 201, it is screwed to the wiring of the output terminal. A first screw hole 131 at the first end of the post 13 . Therefore, while the transfer copper bar 31 is mechanically fixed to the shunt bus bar 20, the shunt bus bar 20 is also mechanically fixed to the output terminal, and the conductive connection between the transfer copper bar 31 and the copper sheet in the shunt bus bar 20 is also realized. , and the conductive connection between the copper sheet in the shunt busbar 20 and the terminal post 13 . In order to improve the stability of the shunt busbar 20 , each terminal 13 of the above-mentioned output terminals is fixedly connected to a conductive seat 201 through a fixing screw 22 .

In addition, multiple installation hole groups can be set on the above-mentioned shunt busbar 20, and each installation hole group is used to connect an electrical device. For example, when the output copper bar 43 outputs three-phase electric energy, each of the shunt busbars 20 The installation hole group includes three conductive seats 201 . Correspondingly, there are a plurality of terminal ports on the casing 40, and the converter includes a plurality of output terminals; each output terminal is sealed and fixed in one terminal port, and the terminal 13 in each output terminal is connected to the side of the shunt busbar 20. A set of mounting holes.

The above shunt bus bar 20 can convert the output of the output copper bar 43 into two identical current outputs, which can ensure the uniformity of the current transmission through the transfer copper bar 31 and the output copper bar 43, and at the same time can use the shunt bus bar The heat dissipation capability of the row 20 reduces the temperature rise of the entire system and improves the adaptability and reliability of the system to the environment.

The above is only a preferred embodiment of the utility model, but the scope of protection of the utility model is not limited thereto, and any person familiar with the technical field can easily think of All changes or replacements should fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (10)

1. An output terminal, characterized in that it includes a backplane, a magnetic ring, and a plurality of binding posts, wherein: the plurality of binding posts respectively pass through the backplane and are fixedly connected to the backplane; A plurality of terminals are insulated from each other, and the first end of each terminal is located on the first side of the backplane, and the second end is located on the second side of the backplane; and the size of the magnetic ring protruding from the second side of the back plate is smaller than that of the second end of the binding post protruding from the second side of the back plate size of. 2. The output terminal according to claim 1, wherein the radial cross section of the magnetic ring is elliptical, and is fixed on the second side of the back plate by screws, and the central axis of the magnetic ring and the central axes of the terminal posts are respectively perpendicular to the backplane. 3. The output terminal according to claim 2, wherein the back plate is made of insulating material, the output terminal further includes a plastic casing, and the plastic casing is set outside the magnetic ring, and the terminal The second end is exposed to the outside of the plastic casing. 4 . The output terminal according to claim 2 , wherein the backplane, the binding posts, and the magnetic ring are packaged as one by hot melt adhesive. 5. A converter, characterized in that it includes a casing, an output copper bar, and the output terminal according to any one of claims 1-4; wherein: the output copper bar is installed in the casing ; There is a terminal port on the casing, and the shape and size of the terminal port match the shape and size of the back plate of the output terminal; the output terminal is sealed and fixed on the terminal port of the casing, and the The output copper bar is connected to the terminal post of the output terminal through a conductive connector. 6 . The converter according to claim 5 , wherein the conductive connectors include transfer copper bars and shunt bus bars, and the transfer copper bars and shunt bus bars are respectively installed on the casing Inside; the shunt busbar is fixed on the output terminal with the second side facing the output terminal, and the shunt busbar is electrically connected to the terminal; the first end of the transfer copper bar is fixedly connected On the output copper bar, the second end is fixedly connected to the first side of the distribution bus bar. 7. The converter according to claim 6, wherein the output copper bar includes multi-phase output openings, the shunt bus bar includes multiple copper plates separated by insulating materials, and the output copper bar The output opening of each phase is conductively connected to a piece of copper plate of the shunt busbar through one of the transfer copper bars. 8. The converter according to claim 7, wherein the shunt busbar has a mounting hole group consisting of a plurality of conductive seats, and each of the conductive seats is connected to the shunt busbar. A piece of copper plate is conductively connected; each of the conductive seats has a mounting hole, and the second end of each of the transfer copper bars is connected and fixed to one of the conductive seats by screws. 9 . The converter according to claim 8 , wherein each terminal in the output terminal is fixedly connected to one of the conductive seats through a fixing screw. 10. The converter according to claim 9, wherein the shunt busbar includes a plurality of the installation hole groups, the casing has a plurality of the terminal ports, and the converter The device includes a plurality of output terminals; each of the output terminals is sealed and fixed in one of the terminal openings, and the terminal in each of the output terminals is connected to a mounting hole group of the shunt busbar.