Wiring terminal with filtering function

Abstract

The utility model relates to a wiring terminal with a filtering function, which comprises a shell, a plurality of internal metal connecting parts, external metal connecting parts and a grounding screw, and further comprises a filtering function unit and a protection part, and the filtering function unit is electrically connected between the external metal connecting parts so as to realize the filtering function between different external metal connecting parts; or the filtering function unit is electrically connected between the external metal connecting part and the grounding screw so as to realize the grounding filtering function of the external metal connecting part. The filtering function unit is arranged outside the shell, the characteristic that the external space of the wiring terminal is sufficient is fully utilized, the influence of electromagnetic interference inside the converter on the external filtering function unit is small, and the filtering effect is good; and then a protection part is arranged to protect the filtering function unit so as to realize a protection grade requirement or a safety requirement. When the filtering measure needs to be maintained and replaced, only the external filtering function unit needs to be replaced, and the cover of the power electronic converter does not need to be disassembled to maintain internal devices.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronic converters, in particular to a wiring terminal with a filtering function. Background Art

[0002] The main connection method between the inside and outside of the power electronic converter is the terminal block, which includes two main power terminals: DC and AC, as well as signal terminals. Figure 1 and Figure 2 As shown, it is a design drawing of a traditional terminal block on a switch. The terminal block includes a shell, multiple internal metal connections, multiple external metal connections, fixing screws and grounding screws. The fixing screws fix the internal metal connections and the external metal connections to the shell. The internal metal connections and the external metal connections are used to connect power lines or signal lines. When necessary, the external metal connections can be grounded through the grounding screws.

[0003] The usual terminal design mainly considers functional requirements such as current flow, withstand voltage, protection level and safety regulations, but does not consider the need for integrated filtering measures. When solving the EMC problem of power electronic converters, filtering design is usually carried out inside the converter. Placing filtering measures inside the converter is often limited by the limited internal space. The filtering measures are affected by the electromagnetic interference inside the converter, resulting in poor results and need to be improved. Utility Model Content

[0004] The utility model aims to provide a wiring terminal with filtering function, which has the advantages of good filtering effect, high reliability and convenient maintenance.

[0005] The utility model is implemented as follows: a terminal block with a filtering function comprises a shell, a plurality of internal metal connecting parts, a plurality of external metal connecting parts and a grounding screw, and also comprises a filtering function unit and a protective part, wherein the protective part is used to protect the filtering function unit, and the filtering function unit is electrically connected between the external metal connecting parts to realize the filtering function between different external metal connecting parts; or the filtering function unit is electrically connected between the external metal connecting part and the grounding screw to realize the filtering function of the external metal connecting part to the ground.

[0006] The filtering function unit includes a PCB board and a filtering element arranged on the PCB board. The PCB board is arranged outside the shell. One end of the PCB board is connected to the external metal connecting part through a metal screw, and the other end is grounded through a grounding screw.

[0007] Wherein, the PCB board is provided with a first wiring portion and a second wiring portion, which are respectively used to achieve electrical connection with the metal screw and the grounding screw.

[0008] The filtering function unit includes a PCB board and a filtering element arranged on the PCB board. The PCB board is arranged outside the shell, and both ends of the PCB board are connected to different external metal connecting parts through metal screws.

[0009] Wherein, the PCB board is provided with a first wiring portion for achieving electrical connection with the metal screw.

[0010] The PCB board is sealed outside the housing in a plastic-sealed form, and the plastic-sealed portion forms the protective portion.

[0011] Wherein, the filter element is a passive filter device or an active filter device.

[0012] Wherein, the filtering element is one or more of a capacitor, an inductor, a resistor, a lightning arrester, and a varistor.

[0013] The beneficial effects of the utility model are as follows: first, the present application sets the filter function unit outside the shell, making full use of the feature that the external space of the terminal block is relatively sufficient, and the electromagnetic interference inside the converter has little effect on the external filter function unit, and the filtering effect is good, which can improve the filtering performance of the whole machine, and is more suitable in terms of effect and placement space; and then a protection part is set to protect the filter function unit to meet the protection level requirements or safety requirements, and improve the reliability of the external filter function unit. According to actual needs, the filter function unit can be set between external metal connecting parts to realize the filtering function between different external metal connecting parts; or be electrically connected between the external metal connecting part and the grounding screw to realize the filtering function of the external metal connecting part to the ground. When the filtering measures need to be maintained and replaced, it is only necessary to replace the external filter function unit, and there is no need to disassemble the cover of the power electronic converter to maintain the internal components, which saves maintenance time and increases customer benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a top view of a connection terminal of a converter in the prior art;

[0015] Figure 2 is a side view of a connection terminal of a converter in the prior art;

[0016] Figure 3 It is a top view of the first embodiment of the wiring terminal of the utility model;

[0017] Figure 4 It is a side view of the first embodiment of the wiring terminal of the utility model;

[0018] Figure 5 It is a top view of the second embodiment of the wiring terminal of the utility model;

[0019] Figure 6It is a side view of the second embodiment of the wiring terminal of the utility model.

[0020] Among them, 1. Shell; 2. Internal metal connection part; 3. External metal connection part; 4. Fixing screw; 5. Grounding screw; 6. Filtering function unit; 61. PCB board; 611. First wiring part; 612. Second wiring part; 62. Filter element; 7. Metal screw. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is 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 used to limit the utility model.

[0022] As an embodiment 1 of the wiring terminal with filtering function described in the utility model, Figure 3 and Figure 4 As shown, it includes a shell 1, multiple internal metal connecting parts (not shown), multiple external metal connecting parts 3 and a grounding screw 5, and also includes a filtering functional unit 6 and a protective part (not shown). The protective part is used to protect the filtering functional unit 6. The filtering functional unit 6 is electrically connected between the external metal connecting part 3 and the grounding screw 5 to realize the filtering function of the external metal connecting part 3 to the ground.

[0023] In this embodiment, the terminal block has three groups of internal metal connections and external metal connections 3, and the external metal connections 3 can be connected to power lines to transfer electric energy, or connected to signal lines to transfer signals. The number of groups of internal metal connections and external metal connections 3 can be increased or decreased according to actual needs. According to actual needs, one or more external metal connections 3 can be selected for grounding filtering.

[0024] First of all, the present application sets the filter function unit 6 outside the housing 1, making full use of the feature that the external space of the terminal block is relatively sufficient, and the electromagnetic interference inside the converter has little effect on the external filter function unit 6, and the filtering effect is good, which can improve the filtering performance of the whole machine, and is more suitable in terms of effect and placement space; and then a protection part is set to protect the filter function unit 6 to meet the protection level requirements or safety requirements, and improve the reliability of the external filter function unit 6. According to actual needs, the filter function unit 6 is electrically connected between the external metal connection part 3 and the grounding screw 5 to realize the filtering function of the external metal connection part 3 to the ground. When the filtering measures need to be maintained and replaced, it is only necessary to replace the external filter function unit 6, and there is no need to disassemble the cover of the power electronic converter to maintain the internal components, which saves maintenance time and increases customer benefits.

[0025] In this embodiment, the filtering function unit 6 includes a PCB board 61 and a filtering element 62 arranged on the PCB board 61. The PCB board 61 is arranged outside the housing 1. One end of the PCB board 61 is connected to the external metal connecting part 3 through a metal screw 7, and the other end is grounded through a grounding screw 5. The PCB board 61 is provided with a first wiring part 611 and a second wiring part 612, which are respectively used to achieve electrical connection with the metal screw 7 and the grounding screw 5. The filtering element 62 is a passive filtering device or an active filtering device. For example, one or more of a capacitor, an inductor, a resistor, a lightning arrester, and a varistor, or other functional circuits, as long as it has a corresponding filtering function.

[0026] In this embodiment, the PCB board 61 is sealed outside the housing 1 by plastic sealing, and the plastic sealing part forms the protective part, which wraps the PCB board 61 and the filter element 62, so as to achieve sealed isolation protection of the filter function unit 6, and form a good seal with the housing 1 of the terminal block, thereby improving the reliability of the externalized filter function unit 6. Of course, other sealing methods can also be used, such as setting a sealing cover and other structures.

[0027] As a second embodiment of the wiring terminal with filtering function described in the utility model, Figure 5 and Figure 6 As shown, the difference from the first embodiment is that the filtering function unit 6 is electrically connected between the external metal connection parts 3 to achieve the filtering function between different external metal connection parts 3 .

[0028] In this embodiment, the filtering function unit 6 includes a PCB board 61 and a filtering element 62 disposed on the PCB board 61. The PCB board 61 is disposed outside the housing 1, and both ends of the PCB board 61 are connected to different external metal connecting parts 3 through metal screws 7. A first wiring part 611 is provided on the PCB board 61 for achieving electrical connection with the metal screw 7. Other structures and beneficial effects are consistent with those of the first embodiment and are not described in detail here.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A terminal block with filtering function, comprising a housing, a plurality of internal metal connecting parts, a plurality of external metal connecting parts and a grounding screw, characterized in that: It also includes a filtering function unit and a protective part, wherein the protective part is used to protect the filtering function unit, and the filtering function unit is electrically connected between external metal connecting parts to realize the filtering function between different external metal connecting parts; or the filtering function unit is electrically connected between the external metal connecting part and the grounding screw to realize the filtering function of the external metal connecting part to the ground.

2. The connection terminal with filtering function according to claim 1, characterized in that: The filtering function unit includes a PCB board and a filtering element arranged on the PCB board. The PCB board is arranged outside the housing. One end of the PCB board is connected to an external metal connecting part through a metal screw, and the other end is grounded through a grounding screw.

3. The connection terminal with filtering function according to claim 2, characterized in that: The PCB board is provided with a first wiring portion and a second wiring portion, which are respectively used to realize electrical connection with the metal screw and the grounding screw.

4. The connection terminal with filtering function according to claim 1, characterized in that: The filtering function unit comprises a PCB board and a filtering element arranged on the PCB board. The PCB board is arranged outside the housing, and both ends of the PCB board are connected to different external metal connecting parts through metal screws.

5. The connection terminal with filtering function according to claim 4, characterized in that: The PCB board is provided with a first wiring portion for achieving electrical connection with the metal screw.

6. The connection terminal with filtering function according to any one of claims 2 to 5, characterized in that: The PCB board is sealed outside the housing in the form of plastic sealing, and the plastic sealing part forms the protective part.

7. The connection terminal with filtering function according to claim 6, characterized in that: The filter element is a passive filter device or an active filter device.

8. The connection terminal with filtering function according to claim 6, characterized in that: The filtering element is one or more of a capacitor, an inductor, a resistor, a lightning arrester, and a varistor.

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