CN216747834U

CN216747834U - Manganin shunt and electric energy meter assembly

Info

Publication number: CN216747834U
Application number: CN202122666848.6U
Authority: CN
Inventors: 施耀; 殷超
Original assignee: Jiaxing Huajin Technology Co ltd
Current assignee: Jiaxing Huajin Technology Co ltd
Priority date: 2021-11-02
Filing date: 2021-11-02
Publication date: 2022-06-14
Anticipated expiration: 2031-11-02

Abstract

The utility model provides a manganin shunt capable of improving the accuracy and reliability of current sampling, which at least comprises a manganin sheet body, and a first plug pin and a second plug pin which are arranged on the manganin sheet body and used for current sampling; first grafting pin includes the first changeover portion that draws forth from manganin piece body top, is on a parallel with the first changeover portion that extends to second grafting pin connection end direction from first changeover portion top and upwards extends the first grafting section from first extension section end, second grafting pin includes the second changeover portion that draws forth from manganin piece body top, connects the second changeover portion and extends to the second extension section that first changeover portion direction extends and upwards extends the second grafting section from second extension section end, wherein, second extension section and first grafting section cross arrangement in the space, and the end extension of second extension section surpasss first changeover portion.

Description

Manganin shunt and electric energy meter assembly

Technical Field

The utility model relates to the technical field of current dividers, in particular to a manganin current divider and an electric energy meter assembly with the manganin current divider.

Background

Electronic electric energy meters usually use high-stability materials such as manganin to manufacture a current sampling element, namely a manganin shunt. As shown in fig. 1, the conventional manganin shunt includes two

pure copper sheets

5 and 6 and a manganin sheet 7 disposed between the two pure copper sheets, wherein the pure copper sheet at one end of the manganin sheet is used for connecting a relay, and the pure copper sheet at the other end is used as an access end for accessing a load current line. Two

rigid plug pins

71 and 72 for current sampling are arranged on the manganin sheet 7, and the tail ends of the two rigid plug pins are plugged and connected to a printed board (circuit board) of the electric energy meter. When load current passes through the manganin shunt, voltage drop can be generated on the resistor between the two plug pins to form sampling signals, and different voltage drops can be generated by load currents with different sizes. The adopted signals are transmitted to the electric energy meter through a sampling signal wire, filtered and then connected to a metering chip, and the actual load current is converted out, so that the metering of the electric energy meter is realized.

However, due to the action of an alternating magnetic field applied from the outside and caused by the on-off of the current divider, the plug pins on the conventional manganin current divider can form extra electromotive force in a sampling loop thereof under the action of a variable magnetic field, thereby affecting the accuracy of current sampling.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a manganin shunt and an electric energy meter assembly with the manganin shunt, aiming at reducing the interference of an alternating magnetic field caused by external application and self current on-off through a specific structural design, improving the precision and reliability of current sampling and being capable of being reliably and efficiently installed and connected. The technical scheme is as follows:

a manganin shunt at least comprises a manganin sheet body, a first plug pin and a second plug pin, wherein the first plug pin and the second plug pin are arranged on the manganin sheet body and are used for current sampling; first grafting pin includes the first changeover portion that draws forth from manganin piece body top, is on a parallel with the first changeover portion that extends to second grafting pin connection end direction from first changeover portion top and upwards extends the first grafting section from first extension section end, second grafting pin includes the second changeover portion that draws forth from manganin piece body top, connects the second changeover portion and extends to the second extension section that first changeover portion direction extends and upwards extends the second grafting section from second extension section end, wherein, second extension section and first grafting section cross arrangement in the space, and the end extension of second extension section surpasss first changeover portion.

Furthermore, second extension section and second grafting section integral type set up, the one end of second extension section is fixed in on the lateral surface that first grafting section was kept away from to the second changeover portion through riveting or welded mode.

Furthermore, the second extension section is provided with a bending part which is deflected towards the direction of the first insertion section after extending over the first insertion section.

Furthermore, the thickness of the second extension section is 1/3-1/2 of the thickness of the manganese-copper sheet body.

Furthermore, the first inserting section is provided with a yielding groove corresponding to the second extending section at one end close to the first extending section.

Furthermore, the manganin shunt also comprises a first copper sheet and a second copper sheet which are arranged on two sides of the manganin sheet body, and a third plug pin for voltage sampling is arranged on one of the first copper sheet and the second copper sheet.

The utility model also provides an electric energy meter assembly comprising: the manganin shunt comprises a relay, a PCB and the manganin shunt, wherein the inserting sections of a first inserting pin, a second inserting pin and a third inserting pin of the manganin shunt are respectively connected with the PCB in an inserting mode.

The utility model has the following beneficial effects:

1) according to the manganin current divider, through the unique cross design of the two current sampling pin structures, induced current loops which can be mutually offset can be formed in the length direction and the thickness direction of a manganin sheet, so that the interference of an alternating magnetic field caused by external application or on-off of self current is reduced, and the precision and the reliability of current sampling are effectively improved.

2) The manganin shunt disclosed by the utility model is designed by adopting the pins made of hard materials, is convenient to be installed and connected with a PCB (printed circuit board), and can improve the installation reliability and efficiency.

Drawings

Fig. 1 is a schematic structural view of a conventional manganin shunt.

Fig. 2 is a schematic front view of an embodiment of the manganin shunt of the present invention.

Fig. 3 is a schematic diagram of a back structure of the embodiment in fig. 2.

Fig. 4 is a schematic top view of the embodiment shown in fig. 2.

Detailed Description

For a further understanding of the utility model, reference will now be made to the preferred embodiments of the utility model by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the utility model, and not to limit the scope of the claims.

The embodiment of the utility model provides a manganin shunt, which is shown in the embodiment shown in the attached figures 2 to 4 and comprises a manganin sheet body 1, and a first copper sheet 3 and a second copper sheet 4 which are arranged on two sides of the manganin sheet body 1. The manganese copper sheet body 1 is provided with a first plug pin 10 and a second plug pin 20 for current sampling, and the first copper sheet 3 is provided with a third plug pin 30 for voltage sampling.

Wherein, first grafting pin 10 sets up with manganin piece body 1 integral type, and it includes the first changeover portion 101 of drawing forth from the 1 top of manganin piece body, is on a parallel with the first extension section 102 that the second grafting pin connection end direction extended and upwards extends first grafting section 103 from first extension section 102 end from first changeover portion 101 top to the manganin piece body top, and the end of first grafting section 103 is the contact pin. In the illustrated embodiment, the first transition section 101 and the first extension section 102 of the first plug pin 10 have the same thickness as the manganin sheet body 1.

The second plug pin 20 comprises a second transition section 201 led out from the top end of the manganin sheet body 1, a second extension section 202 connected with the second transition section 201 and extending towards the first transition section, and a second plug section 203 extending upwards from the tail end of the second extension section. The second extending section 202 and the first plugging section 103 are arranged in a spatially crossed manner, and the end of the second extending section 202 extends beyond the first transition section 101. In the embodiment shown, the second extending section 202 and the second inserting section 203 are integrally arranged, and the thickness of the second extending section and the second inserting section is 1/3-1/2 of the thickness of the manganin sheet body 1.

As a preferred embodiment, for convenience of assembly, one end of the second extension section 202 is fixed to the outer side surface of the second transition section 201 away from the first plug section by riveting or welding.

As a preferred embodiment, the first plugging section 103 is provided with a receding groove 1031 corresponding to the second extending section 202 at one end close to the first extending section 102, so that the overall structure is more compact, and the anti-electromagnetic interference effect can be better achieved, and the principle of which will be described later.

As a further preferred embodiment, the second extending section 202 extends to beyond the first inserting section 103, and then is provided with a bending section 2021 which is deflected towards the direction of the first inserting section 103, and then continues to extend parallel to the top of the manganin sheet body to extend beyond the first transition section 101 and then is bent upwards to form the second inserting section 203.

By adopting the structure, during work, on the plane projection of the manganin sheet body 1, the currents generated by the area A where the manganin sheet body 1, the first transition section 101, the first extension section 102 and the second transition section 201 are located and the area B where the first inserting section 103, the second extension section 202 and the second inserting section 203 are located under the condition of an alternating magnetic field are mutually offset, so that the effect of resisting the interference of the alternating magnetic field is achieved. On the other hand, referring to fig. 4, the second extending section 202 is provided with the bent portion 2021, so that induced currents of two portions of the second extending section before and after the bent portion 2021 in the thickness direction of the manganin sheet body 1 can also be mutually offset, thereby further improving the anti-interference effect.

The utility model also provides an electric energy meter assembly comprising: the relay, the PCB and the manganin shunt with good anti-interference effect according to the embodiment. And the inserting sections of the first inserting pin, the second inserting pin and the third inserting pin of the manganin current divider are respectively connected with the PCB in an inserting way. Since its general structure is well known to those skilled in the art, it is not specifically described herein.

The above description of the embodiments is only intended to facilitate the understanding of the method of the utility model and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. The manganin shunt is characterized by at least comprising a manganin sheet body (1), and a first plug pin (10) and a second plug pin (20) which are arranged on the manganin sheet body (1) and used for current sampling; the first plug pin (10) comprises a first transition section (101) led out from the top end of the manganin sheet body (1), a first extension section (102) extending from the top end of the first transition section (101) in parallel with the top of the manganin sheet body to the direction of the connecting end of the second plug pin (20), and a first plug section (103) extending upwards from the tail end of the first extension section (102), the second plug pin (20) comprises a second transition section (201) led out from the top end of the manganin sheet body (1), a second extension section (202) connected with the second transition section (201) and extending towards the first transition section (101) and a second plug section (203) extending upwards from the tail end of the second extension section (202), wherein the second extension section (202) and the first plug section (103) are arranged in a crossed manner in space, and the end of the second extension (202) extends beyond the first transition (101).

2. The manganin shunt according to claim 1, characterized in that the second extension section (202) and the second plug section (203) are integrally arranged, and one end of the second extension section (202) is fixed on the outer side of the second transition section (201) away from the first plug section (103) by riveting or welding.

3. The manganin shunt of claim 2, wherein the second extension section (202) is provided with a bending part (2021) which is deflected towards the first plug section (103) after extending over the first plug section (103).

4. The manganin shunt of claim 2, wherein the thickness of the second extension (202) is 1/3-1/2 of the thickness of the manganin sheet body (1).

5. The manganin shunt according to claim 3, characterized in that the first plug section (103) is provided with a relief groove (1031) corresponding to the second extension section (202) at one end close to the first extension section (102).

6. The manganin shunt according to any one of claims 1 to 5, further comprising a first copper sheet (3) and a second copper sheet (4) which are arranged on two sides of the manganin sheet body (1), wherein one of the first copper sheet (3) and the second copper sheet (4) is provided with a third plug pin (30) for voltage sampling.

7. An electric energy meter assembly, comprising: the manganin shunt comprises a relay, a PCB and the manganin shunt according to any one of claims 1 to 6, wherein the plugging sections of the first plugging pin, the second plugging pin and the third plugging pin of the manganin shunt are respectively plugged and connected with the PCB.