Integrated butt-welding structure diverter with power frequency 0.5 MT compensation ring

Abstract

The utility model provides an integrated butt-welding structure diverter with a power frequency 0.5 MT compensation ring. The integrated butt-welding structure diverter comprises a first conducting strip made of T2 copper materials, a second conducting strip made of 6J13 manganese copper materials and a third conducting strip made of T2 copper materials. The lower parts of the first conducting strip and the third conducting strip are bent to form pins; the upper end of the first conducting strip is integrally provided with a first conducting strip pin, the upper end of the second conducting strip is integrally provided with a second conducting strip pin, and the upper end of the second conducting strip is also provided with a conducting strip base; the conductive sheet further comprises a U-shaped compensation ring made of phosphor copper, one end of the U-shaped compensation ring is bent to form a compensation ring base, the other end of the U-shaped compensation ring is provided with a compensation ring pin, and the U-shaped compensation ring is riveted and fixed on the conductive sheet base through the compensation ring base. The anti-interference capability of the electric energy meter is improved, the product quality is stable, and the automatic assembly of the electric energy meter is facilitated.

Description

Technical Field

[0001] The utility model relates to a smart electric meter production device, in particular to an integrated butt-welded structure shunt with an industrial frequency 0.5MT compensation ring. Background Art

[0002] Shunts are widely used in smart meters. From a product perspective, the development trend for shunts is toward a compact, integrated design. From a processing perspective, manufacturers aim to optimize their structure to improve automation and minimize manual operations. The manganese copper in the shunt itself is a very low-resistance resistor. When the load current flows through the manganese copper, a millivolt-level voltage is generated across the resistor between the two terminals of the manganese copper. This voltage is expressed by Ohm's law: U = RI, where I is the current and R is the resistance of the manganese copper. The voltage signal is transmitted via a sampling signal line to the meter PCB. After first-order RC anti-aliasing filtering, it is fed into the metering chip, which calculates the current according to Ohm's law to achieve metering.

[0003] When an energy meter is installed on-site, with rated voltage applied to L and N terminals, the meter is in operation. However, if a high-current line is located near the meter, it will generate a certain power-frequency magnetic field. When this field reaches a certain intensity, it will induce a voltage across the manganese-copper resistor in the meter's shunt, causing metering errors. For this reason, the State Grid requires that grid-connected energy meters possess a certain level of anti-interference capability. The State Grid's 2013 standard, "Technical Specifications for Single-Phase Smart Energy Meters," stipulates that when the meter is in operation and the line is currentless, and exposed to a 0.5mT power-frequency magnetic field, the meter's test output should not produce more than one pulse.

[0004] like Figure 4 It can be seen that in order to solve the problem of external factors interfering with the measurement of electric energy meters, in the prior art, manganese copper shunts use a perforated twisted pair method to eliminate induced voltage. A hole is punched in the middle of the manganese copper shunt 3, and after one strand of the twisted pair 6 is routed through the hole, the two strands are respectively connected to the two pins of the shunt. The routing structure of the perforated and threaded wires in the middle of the shunt can divide the entire manganese copper loop into two areas. According to the law of electromagnetic induction, when the magnetic field parallel to the normal direction of the shunt changes, since the areas of these two loops are the same and the directions of the loops are opposite, they will generate induced currents of equal magnitude and opposite directions, which can cancel each other out, thereby eliminating the interference of the power frequency magnetic field. However, although the manganese copper shunt using the twisted pair process has anti-interference capabilities, the manufacturing process is relatively complicated. There are also requirements for the length of the twisted pair and the number of twists during installation, which is not conducive to achieving automated assembly. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to provide an integrated butt-welded structure shunt with an industrial frequency 0.5MT compensation ring. The electric energy meter equipped with the shunt has anti-interference capability and is conducive to the automatic assembly of the electric energy meter.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A shunt with an integrated butt-welded structure and a 0.5MT power-frequency compensation ring includes a first conductive plate made of T2 copper, a second conductive plate made of 6J13 manganese copper, and a third conductive plate made of T2 copper. The first, second, and third conductive plates are integrally formed into a plate-type structure; the lower portions of the first and third conductive plates are bent into pins; a first conductive plate pin is integrally formed at the upper end of the first conductive plate, a second conductive plate pin is integrally formed at the upper end of the second conductive plate, and a conductive plate base is also provided at the upper end of the second conductive plate; the shunt also includes a U-shaped compensation ring made of phosphor copper, one end of which is bent into a compensation ring base and the other end is provided with a compensation ring pin. The U-shaped compensation ring is riveted to the conductive plate base via the compensation ring base; the compensation ring base is provided between the first and second conductive plate pins.

[0008] Preferably, the bottom surfaces of the lower pins of the first conductive sheet and the third conductive sheet are riveted with brazing sheets.

[0009] Preferably, the first conductive sheet and the third conductive sheet are respectively preset with three arc-shaped notches on the side of their lower pins, the first conductive sheet and the third conductive sheet are punched with concave circular holes on the upper end faces of their lower pins, and circular bulges corresponding to the concave circular holes are punched on the lower end faces of the pins; the brazing sheet is riveted on the circular bulge.

[0010] After adopting the above technical solution, the present invention replaces the traditional twisted pair with a U-shaped compensation ring. Since the U-shaped compensation ring is made of phosphor copper, its resistivity is much lower than that of manganese copper, so manganese copper is the main component of the shunt's resistance. The function of the compensation ring is to offset the induced current of the surrounding power frequency magnetic field, thereby making the shunt anti-interference and improving the accuracy of the electricity meter. The present invention connects the first conductive plate pin, the second conductive plate pin, and the compensation ring pin to the PCB board of the electricity meter. The relative positions of these three pins are fixed. During assembly, as long as the shunt is accurately positioned, the pin connection can be completed, reducing the difficulty of positioning, thus creating favorable conditions for the automated assembly of the electricity meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the working state of the utility model's integrated butt-welded structure shunt with a power frequency 0.5MT compensation ring;

[0012] Figure 2 This is a structural diagram of the utility model of an integrated butt-welded structure shunt with a power frequency 0.5MT compensation ring;

[0013] Figure 3 This is a schematic diagram of the combination of the first conductive sheet, the second conductive sheet, and the third conductive sheet in the present invention;

[0014] Figure 4 The present invention is a schematic diagram of the structure of a manganese-copper shunt piece for twisted-pair cables that is resistant to 0.5 MT power frequency interference in the prior art.

[0015] Figure Number:

[0016] 1: Terminal, 3: Manganin shunt, 31: First conductive sheet, 32: Second conductive sheet, 33: Third conductive sheet, 310: First conductive sheet pin, 320: Second conductive sheet pin, 321: Conductive sheet base, 340: Arc-shaped notch, 341: Concave circular hole, 4: U-shaped compensation ring, 40: Compensation ring base, 41: Compensation ring pin, 5: Brazing sheet, 6: Twisted pair. DETAILED DESCRIPTION

[0017] The specific implementation of the present invention will be further described below with reference to the accompanying drawings.

[0018] like Figure 1 、 Figure 2 、 Figure 3 It can be seen that the integrated shunt with a 0.5MT compensation ring of the present invention comprises a first conductive sheet (31) made of T2 copper, a second conductive sheet (32) made of 6J13 manganese copper, and a third conductive sheet (33) made of T2 copper. The first conductive sheet (31), the second conductive sheet (32), and the third conductive sheet (33) are integrally formed into a sheet structure; the lower parts of the first conductive sheet (31) and the third conductive sheet (33) are bent into pins; the upper end of the first conductive sheet (31) is integrally formed with a third conductive sheet (33). A conductive sheet pin (310), a second conductive sheet pin (320) is integrally formed on the upper end of the second conductive sheet (32), and a conductive sheet base (321) is also provided on the upper end of the second conductive sheet (32); and a U-shaped compensation ring (4) made of phosphor copper is also provided, one end of the U-shaped compensation ring (4) is bent to form a compensation ring base (40), and the other end is provided with a compensation ring pin (41), and the U-shaped compensation ring (4) is riveted and fixed to the conductive sheet base (321) via the compensation ring base (40). The compensation ring base (40) is provided between the first conductive sheet pin (310) and the second conductive sheet pin (320).

[0019] The principle of the utility model is as follows: the second conductive sheet (32) is made of 6J13 manganese copper, and the first conductive sheet (31) and the third conductive sheet (33) are both made of T2 copper. Since manganese copper has a relatively high resistivity, the second conductive sheet (32) between the first conductive sheet pin (310) and the second conductive sheet pin (320) is equivalent to a fixed resistor with a resistance of about 200 micro-ohms. One end of the U-shaped compensation ring (4) is set as the compensation ring pin (41) and is electrically connected to the PCB board of the electric energy meter, and the other end is electrically connected to the second conductive sheet (32) through the compensation ring base (40) and the conductive sheet base (321). The U-shaped compensation ring (4) is actually an extension line of the other end of the manganese copper resistance. Since the U-shaped compensation ring is made of phosphor copper, its resistivity is very low compared to manganese copper, so manganese copper is the main component of the shunt resistance. The function of the compensation ring is to offset the induced current of the surrounding power frequency magnetic field and improve the accuracy of measurement.

[0020] like Figure 1 、 Figure 2 It can be seen that the bottom surfaces of the lower pins of the first conductive sheet (31) and the third conductive sheet (33) are riveted with a brazing sheet (5); during assembly, the lower pins of the first conductive sheet (31) and the third conductive sheet (33) are aligned with a terminal (1), and the brazing sheet (5) is set between the pin and the terminal (1). A voltage is applied to the magnetic welding part using a welding tool, and the brazing sheet (5) melts, and the lower pin and the corresponding terminal (1) are welded together. The resulting workpiece is connected to the PCB board of the electric energy meter through the first conductive sheet pin (310), the second conductive sheet pin (320), and the compensation ring pin (41). The pin connection method is simple, and the relative positions of the three pins are fixed, thereby providing the possibility of automatic assembly of the electric energy meter. In particular, the U-shaped compensation ring (4) is fixed in structure, which greatly improves the assembly convenience compared with the traditional twisted pair mode.

[0021] like Figure 3 It can be seen that the first conductive sheet (31) and the third conductive sheet (33) are respectively pre-set with three arc-shaped notches 340 on the side of their lower pins, and the first conductive sheet (31) and the third conductive sheet (33) are punched with concave circular holes 341 on the upper end faces of their lower pins, and circular convex bumps corresponding to the concave circular holes 341 are punched on the lower end faces of the pins; the brazing sheet (5) is riveted on the circular convex bumps. The benefits of the above structure are: A. The lower pins of the first conductive sheet (31) and the third conductive sheet (33) are the butt welding parts. During the high-temperature butt welding process, the brazing sheet (5) melts and the excess solder overflows from the arc-shaped notches 340, making the pins and the terminal (1) more firmly welded. B. The brazing sheet (5) is riveted on the circular convex bumps, so that the brazing sheet (5) is synchronously circulated with the shunt on the production line, and positioning is simpler during the next butt welding process.

[0022] The specific implementation methods of the present invention include but are not limited to the above embodiments. Without departing from the essence of the present invention, any simple modifications, changes and changes in equivalent methods made to the above embodiments by those skilled in the art shall still fall within the scope of protection of the present invention.

Claims

1. An integrated butt-welded structure shunt with an industrial frequency 0.5MT compensation ring, comprising a first conductive sheet (31) made of T2 copper, a second conductive sheet (32) made of 6J13 manganese copper, and a third conductive sheet (33) made of T2 copper, wherein the first conductive sheet (31), the second conductive sheet (32), and the third conductive sheet (33) are integrally formed into a sheet-type structure; characterized in that: The lower parts of the first conductive sheet (31) and the third conductive sheet (33) are both bent into pins; the upper end of the first conductive sheet (31) is integrally provided with a first conductive sheet pin (310), the upper end of the second conductive sheet (32) is integrally provided with a second conductive sheet pin (320), and the upper end of the second conductive sheet (32) is also provided with a conductive sheet base (321); and the U-shaped compensation ring (4) made of phosphor copper is also included, one end of the U-shaped compensation ring (4) is bent with a compensation ring base (40), and the other end is provided with a compensation ring pin (41), and the U-shaped compensation ring (4) is riveted and fixed to the conductive sheet base (321) via the compensation ring base (40); the compensation ring base (40) is provided between the first conductive sheet pin (310) and the second conductive sheet pin (320).

2. The integrated butt-welded structure shunt with a power frequency 0.5 MT compensation ring according to claim 1, characterized in that: The bottom surfaces of the lower pins of the first conductive sheet (31) and the third conductive sheet (33) are both riveted with soldering sheets (5).

3. The integrated butt-welded structure shunt with a power frequency 0.5 MT compensation ring according to claim 2, characterized in that: The first conductive sheet (31) and the third conductive sheet (33) are respectively provided with three arc-shaped notches (340) on the side surfaces of their lower pins; the first conductive sheet (31) and the third conductive sheet (33) are respectively provided with concave circular holes (341) punched on the upper end surfaces of their lower pins; and circular convex hulls corresponding to the concave circular holes (341) are punched on the lower end surfaces of the pins; and the brazing sheet (5) is riveted on the circular convex hulls.

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