CN2256148Y

CN2256148Y - Thyristor regulating A.C. arc welding transformer working at 380 V source

Info

Publication number: CN2256148Y
Application number: CN 95215453
Authority: CN
Inventors: 齐贤
Original assignee: Qi Xiaoyi
Current assignee: Qi Xiaoyi
Priority date: 1995-07-05
Filing date: 1995-07-05
Publication date: 1997-06-11
Anticipated expiration: 2005-07-05

Abstract

The utility model relates to a thyristor regulating A. C. arc welding transformer working at 380V source, which adopts the mode of positive feedback and automatic compensation for magnetic potential; three windings are connected in series into a primary winding. A secondary winding is composed of the connection in parallel of a thick and a thin windings; a thyristor regulating device is connected in series with the secondary thick winding. The device has the advantages of power save, high power factor, small volume, light weight, etc. Compared with a conventional electromagnetic arc welding transformer, the power consumption of zero load can be decreased by 90%; the utility model can carry out D. C. arc welding.

Description

380 volts of controllable silicons of two-phase are transferred the stream alternating current arc welding transformer

The utility model relates to the lonely weldering of interchange power supply, particularly electromagnetic compensation formula alternating current arc welding transformer.

At present, the power supply of ac arc wedling machine has two kinds of controllable silicon formula and electromagnetic types.Though advantages such as controllable silicon formula arc welder has high efficiency, energy consumption is little, volume is little and in light weight also exist shortcomings such as cost height, poor reliability and maintenance difficulty are big.The lonely welding machine of electromagnetic type is divided into: moving-iron type, consubstantiality formula and moving-coil type.Low, the good reliability of the cost of electromagnetic type arc welder, but operating efficiency is not high, energy consumption is big, and heaviness very.The above-mentioned shortcoming of the electromagnetic type arc welder mainly leakage field commercial weight of its power transformer employing causes, and overcome above-mentioned shortcoming, is just improving its electromagnetic structure.

The purpose of this utility model is to provide a kind of 380 volts of controllable silicon formulas of two-phase that adopt positive feedback to compensate magnetic potential automatically to transfer the stream alternating current arc welding transformer, thereby reaches the little and lightweight purpose of performance, volume energy-conservation, the raising welding.

Architectural feature of the present utility model is as follows: three windings are wound on respectively on three magnetic core cylinders of day font iron core, form two limit windings and a middle winding, described three windings are according to the order of limit winding, limit winding, middle winding, by two is end of the same name, connect for the mode of different name end for the 3rd, constitute elementary winding.Secondary is one thick one thin two windings formations in parallel, and interior, thick winding order outside is wound on the above-mentioned elementary middle winding outside successively by thin winding.Be connected to a bridge rectifier and a voltmeter between two outputs of secondary winding, in the outlet line of secondary winding, connect an ammeter.The output of above-mentioned bridge rectifier is the dc output end of arc welder.One of serial connection is transferred the stream device in secondary thick winding circuit.

The utility model is exported big electric current at secondary winding, under the situation that voltage reduces, the limit winding can be born all the other voltages of power supply, but the magnetic flux of its generation is at output winding interlinkage, and be two magnetic flux sums that the limit winding is produced, the magnetic flux that middle winding self is produced again interlinkage in output winding.So the secondary winding electric current is big more, the magnetic flux that the limit winding produces is also big more, and the output voltage of secondary winding is also increased, and this positive feedback effect makes this transformer fe core volume very little, but can obtain very big power output.Owing to adopt two winding outputs in parallel that sectional area is different, reduced the output internal resistance, owing to reduced the secondary winding number of turn, can reduce its output impedance again, increase welding current simultaneously.

This device is in order more to help the heat radiation of winding, and with the trapezoidal coiling of limit winding, and sectional area can be thinner, with the coiling of middle winding rectangle.Be connected to the voltage dial gauge at secondary winding two outputs.

The utility model is compared with traditional electromagnetism transformer of arc welder, has following advantage:

1. because primary coil is divided into rational three sections, so coil turn can be more, making that no-load current is very little, is 1/2nd of traditional electrical magnetic-type arc welder, and power savings is obvious;

2. the self-heating phenomenon is not serious, is furnished with air cooling equipment again, and its actual load factor has improved many than 20%;

3. because floating voltage guarantees striking, and that electric current can transfer to is very little, therefore, can carry out 0.5 millimeter welding with upper thin sheet, also has all properties of DC welder;

4. when line voltage was 170 volts, this device is work as usual; This device has the function that reduces line voltage, can satisfy that some is high-power, the special occasions of low voltage operating load uses;

5. the volume of this device is very little, very light in weight;

6. the starting the arc is fast, does not need to add the high-frequency electronic arc starter again.

The drawing explanation:

Accompanying drawing is circuit theory diagrams of the present utility model.

Specific embodiment of the utility model is seen accompanying drawing.Group winding W1 at the beginning of three, on day font iron core B1, B2, B3, W1, W3 are the limit windings respectively for W2, W3, and W2 is middle winding, and W1 and W3 end of the same name, W2 and W3 are that the different name end is in series successively, the elementary winding of formation arc welding transformer.Compose in parallel the secondary ac output end of arc welding transformer by two windings of W4, W5, wherein W4 is thin winding, and W5 is thick winding.The winding W2 outside during W4 is wound on, W5 is wound on the W4 outside.Be serially connected in by a bidirectional triode thyristor SCR in the output of above-mentioned secondary thick winding W5, the trigger electrode of this bidirectional triode thyristor SCR and the end of bidirectional diode DZ join, the other end of bidirectional diode DZ joins by the other end of capacitor C and secondary thick winding, this end also joins with the moving contact 1 of change over switch K1, two fixed contacts 2,3 of change over switch K1 join by an end of potentiometer W1, W2 and resistance R 1 respectively, and the other end of resistance R 1 is connected with an end that meets bidirectional triode thyristor SCR of above-mentioned secondary thick winding.Above-mentioned potentiometer W1, W2 are separately positioned on welding machine and the weld handle plier.D1～D4 is a bridge rectifier, and its output is direct current output.This device scope of application is extensive, also can carry out brazing, spot welding, cutting steel plate and carry out the stainless steel welding.

Claims

1. 380 volts of controllable silicons of a two-phase are transferred the stream alternating current arc welding transformer, it is characterized in that: three windings are wound on respectively on three magnetic core cylinders of day font iron core, form two limit windings and a middle winding, order according to two limit windings and a middle winding, by two is end of the same name, connect for the mode of different name end for the 3rd, constitute elementary winding; Secondary is one thick one thin two windings formations in parallel, and presses thin winding interior, and thick winding order outside is wound on the above-mentioned elementary middle winding outside successively; Between two outputs of secondary winding, be connected to a bridge rectifier and a voltmeter; The output of above-mentioned bridge rectifier is the dc output end of arc welder; One of serial connection is transferred the stream device in secondary thick winding circuit.

2. 380 volts of controllable silicons of two-phase as claimed in claim 1 are transferred the stream alternating current arc welding transformer, it is characterized in that: transfer the stream device to be serially connected in the output of above-mentioned secondary thick winding W5 by a bidirectional triode thyristor SCR, the trigger electrode of this bidirectional triode thyristor SCR is connected with the end of bidirectional diode DZ, the other end of bidirectional diode DZ is connected with the other end of secondary thick winding by capacitor C, this end also is connected with the moving contact 1 of change over switch K1, two fixed contacts 2 of change over switch K1,3 difference energy overpotential device W1, W2 is connected with an end of resistance R 1, and the other end of resistance R 1 is connected with the bidirectional triode thyristor SCR end that connects of above-mentioned secondary thick winding; Above-mentioned potentiometer W1, W2 are separately positioned on welding machine and the weld handle plier.