CN111627771A

CN111627771A - A novel mutual-inductor structure for overload protection

Info

Publication number: CN111627771A
Application number: CN202010240965.3A
Authority: CN
Inventors: 米传岭
Original assignee: Qingdao Topscomm Communication Co Ltd
Current assignee: Qingdao Topscomm Communication Co Ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2020-09-04

Abstract

The invention discloses a double-transformer structure capable of realizing automation for overload protection and residual current protection and a main circuit thereof. At present, most of schemes of overload protection use a thermal bimetallic strip to be deformed by heating to pull a connecting rod, the connecting rod is connected with a jump buckle, and the jump buckle is pulled to execute tripping action. The scheme has the defects of low precision, poor reliability, difficult production process and the like, and the accuracy of the overload protection performance is restricted. Under the overload condition, the voltage at two ends of the main loop is lower, so that the terminal voltage cannot be directly used for supplying power to the electronic PCB so as to drive the tripper to trip. Aiming at the situation, the invention uses the main loop to add the energy taking structure of the mutual inductor to supply power to the PCB for driving. According to the invention, a thermal bimetallic strip is omitted, the space of the circuit breaker is enlarged, and the zero-sequence mutual inductor and the energy-taking mutual inductor are simultaneously designed on the side of the traditional circuit breaker, so that more space is provided for the expansion of the functions of an electronic side; the defects that the consistency of the conventional thermal bimetallic strip material is poor, the precision is low, the influence of the environment is large, the production is difficult to control and the like are overcome, the production problem caused by conventional winding is solved, and a foundation is laid for the automation of the product.

Description

A novel mutual-inductor structure for overload protection

Technical Field

The invention relates to a novel transformer structure for overload protection.

Background

Most of the overload protection schemes of the market miniature circuit breakers use a thermal bimetallic strip to deform by heating to pull a connecting rod, the connecting rod is connected with a jump buckle, and the jump buckle is pulled to execute tripping action. The scheme has the defects of low precision, poor reliability, difficult production process, great influence of external environment and the like, and the accuracy of the overload protection performance is restricted.

In addition, the requirements for miniaturization and intellectualization of the circuit breaker on the market are higher and higher, the size of the circuit breaker is smaller and smaller, the product performance of the DPN structure is gradually improved, the share proportion of the DPN structure in the market is increased, a DPN leakage product with the thickness of 18mm appears in the market, the rated current can meet 32A, and the DPN leakage product is divided into 6KA, but the production process is complex, and automation cannot be realized.

Disclosure of Invention

The invention aims to solve the problems and provides a double-transformer structure and a main circuit thereof.

The invention adopts the following technical scheme;

the utility model provides a novel mutual-inductor structure for overload protection, includes takes off can mutual-inductor subassembly, zero sequence mutual-inductor, main circuit and accessory circuit triplex, gets can mutual-inductor and provides the release action of circuit breaker through the secondary side induced-current output energy of main circuit, and zero sequence mutual-inductor judges whether electric leakage through the secondary side transformation ratio of response main circuit L, N current difference, and the main circuit passes through the inlet wire end, the access of appearing the end provides complete closed circuit for whole circuit.

Wherein, get can the mutual-inductor subassembly including getting can the mutual-inductor, lug L go out, mutual-inductor connecting wire, run arc board L, connection piece L, according to the product specification of difference, the mutual-inductor connecting wire has three kinds of specifications. The energy-taking mutual inductor consists of a shell, an enameled wire coil and a contact pin; the connecting sheet L is connected with the arc running plate L through welding; the outlet of the lug L is connected with a connecting wire of the mutual inductor by welding; after the two assemblies are simultaneously inserted into the energy-taking mutual inductor, one end of a connecting wire of the mutual inductor is welded with one end of the connecting sheet L to complete the whole assembly.

The zero sequence transformer comprises a zero sequence transformer shell, an enameled wire coil, a pin base and a pin.

The main circuit and the auxiliary circuit comprise a moving contact connecting component L and a moving contact connecting component N. The moving contact connecting assembly L consists of a moving contact support L, a moving contact L, a flexible conductor and a connecting line L, wherein the flexible conductor is connected with the connecting line through welding and then connected with the moving contact L and the moving contact support L in an assembling and welding manner; the moving contact connecting assembly N consists of a moving contact support N, a moving contact N, a flexible conductor, a connecting wire N and a lug N, and the connecting mode is consistent with that of the moving contact connecting assembly L.

The three components are assembled with the shell, the assembling process is free of front and back interference, stacking can be completed layer by layer, after the assembling is completed, the connecting wire N is bent by using a special tool and then is connected with the connecting piece N through tin soldering, and the connecting wire L is connected with the connecting piece L in the energy-removing mutual inductor through tin soldering.

The invention has the following beneficial effects: the consistency is controllable, the manufacture is simple, the assembly is convenient, the cost is low, the overload function which is difficult to control in the prior art can be solved in an electronization mode, the space of the zero sequence transformer is saved, and the solution is provided for the miniature circuit breaker products to the aspects of intellectualization, accurate control and automatic production.

Drawings

FIG. 1 is a schematic diagram of a double-transformer structure and a main circuit thereof assembled to a housing according to the present invention

FIG. 2 is a schematic diagram of the specification of an energy-taking transformer assembly

FIG. 3 is a schematic diagram of the specification of an energy-taking transformer assembly

FIG. 4 is a schematic diagram showing the specification of an energy-taking transformer assembly

FIG. 5 is a schematic diagram of the main circuit and the auxiliary circuit and their assembly with the zero sequence transformer

Detailed Description

Fig. 1 is a schematic diagram of a dual transformer structure and a main circuit structure thereof according to the present invention. The energy-taking mutual inductor comprises an energy-taking mutual inductor component 1, a zero sequence mutual inductor 2, a main circuit and an auxiliary circuit 3. The three parts are assembled with the shell in a laminating and welding mode in assembly, and do not interfere with each other in the assembly process.

As shown in fig. 2, the energy-taking mutual inductor component 1 comprises an energy-taking mutual inductor 4, a lug plate L outlet 7, a mutual inductor connecting wire 8, an arc running plate L6 and a connecting sheet L5, and the mutual inductor connecting wire has three specifications according to different product specifications, as shown in fig. 3 and 4. The energy-taking mutual inductor consists of a shell, an enameled wire coil and a contact pin; the connecting sheet L5 and the arc running plate L7 are connected together through medium-frequency direct current welding, and a customized welding electrode is used in the welding process to ensure the welding reliability; the outlet of the lug plate L7 is connected with a mutual inductor connecting wire 8 through intermediate-frequency direct current welding; connection piece L5 one end is the cockscomb structure, goes out with the mutual-inductor casing cooperation and is interference fit, forces its use instrument to assemble, inserts casing cooperation department with lug L7 one end, treats with above two kinds of subassemblies and inserts behind the mutual-inductor casing of getting energy, accomplishes whole subassembly with mutual-inductor connecting wire 8 one end and connection piece L5 one end intermediate frequency direct current welding.

As shown in fig. 5, the zero sequence transformer 2 includes a zero sequence transformer housing, an enameled wire coil, a pin socket, and a pin.

As shown in fig. 5, the main circuit and the auxiliary circuit 3 include a movable contact connecting assembly L19 and a movable contact connecting assembly N20. The moving contact connecting assembly L19 is composed of a moving contact support L12, a moving contact L13, a flexible conductor 14 and a connecting wire L15, the flexible conductor is connected with the connecting wire through medium-frequency direct current welding, and then is connected with the moving contact L and the moving contact support L in an assembly welding mode, a special welding machine is needed in the welding process, the moving contact support L12 is melted by heating allowance in the welding process, and the moving contact L13 is bonded with the moving contact L13 to form a fixing piece; the moving contact connecting assembly N consists of a moving contact support N16, a moving contact N17, a flexible conductor 14 and a connecting wire N18, and the connecting mode is consistent with that of the moving contact connecting assembly L.

As shown in fig. 1, after the energy-taking transformer assembly 1, the zero sequence transformer 2, the main circuit and the auxiliary circuit 3 are assembled with the housing, the connecting wire N18 is bent by using a special tool and then connected with the lug N21 by soldering, and the connecting wire L15 is connected with the lug N21 in the energy-taking transformer by soldering. Wherein, the connecting sheet N21 and the connecting sheet L5 must have tin plating layers, and one end of the connecting line L15 and the connecting line N18 which are soldered must be processed by tin dipping after an outer insulating skin is annularly cut in advance, so that the reliability of soldering is ensured.

The present invention has been described above by way of example, but the present invention is not limited to the above-described specific embodiments, and any modification or variation made based on the present invention is within the scope of the present invention as claimed.

Claims

1. A double-transformer structure for overload protection and residual current protection and a main circuit thereof comprise:

the energy-taking mutual inductor comprises an energy-taking mutual inductor component, a zero sequence mutual inductor, a main circuit and an auxiliary circuit.

2. The energy-taking mutual inductor as claimed in claim 1 provides the action of the release of the circuit breaker by the secondary side induction current output energy of the main loop, the zero sequence mutual inductor judges whether the current leaks or not by the secondary side transformation ratio of the current difference value of the induction main loop L, N, and the main loop provides a complete closed loop for the whole circuit by the access of the incoming line end and the emergence end.

3. The energy receiving and taking mutual inductor assembly according to claim 1 comprises an energy receiving mutual inductor, a lug L, a mutual inductor connecting wire, an arc running plate L and a connecting sheet L, wherein the mutual inductor connecting wire has three specifications according to different product specifications. The energy-taking mutual inductor consists of a shell, an enameled wire coil and a contact pin; the connecting sheet L is connected with the arc running plate L through welding; the outlet of the lug L is connected with a connecting wire of the mutual inductor by welding; after the two assemblies are simultaneously inserted into the energy-taking mutual inductor, one end of a connecting wire of the mutual inductor is welded with one end of the connecting sheet L to complete the whole assembly.

4. The zero sequence transformer of claim 1, comprising a zero sequence transformer housing, a lacquered wire coil, a pin socket and a pin.

5. The circuit of claim 1, wherein the main circuit and the auxiliary circuit comprise a movable contact connecting assembly L and a movable contact connecting assembly N. The moving contact connecting assembly L consists of a moving contact support L, a moving contact L, a flexible conductor and a connecting line L, wherein the flexible conductor is connected with the connecting line through welding and then connected with the moving contact L and the moving contact support L in an assembling and welding manner; the moving contact connecting assembly N consists of a moving contact support N, a moving contact N, a flexible conductor, a connecting wire N and a lug N, and the connecting mode is consistent with that of the moving contact connecting assembly L.

6. In this patent, after energy-taking mutual inductor subassembly, zero sequence transformer, main circuit and accessory circuit and shell assembly are accomplished, use special frock to be connected with lug N after bending connecting wire N, connecting wire L is connected with lug N among the energy-taking mutual inductor.

7. According to the claim 6, the connecting piece N and the connecting piece L must have tin plating scratches, and the soldered end of the connecting line N of the connecting line L must be processed after the outer insulating skin is annularly cut in advance to ensure the reliability of connection.