CN2326381Y

CN2326381Y - Small dc. electric welder

Info

Publication number: CN2326381Y
Application number: CN 97242334
Authority: CN
Inventors: 彭建华
Original assignee: HAODELI ELECTRONIC INDUSTRY DEVELOPMENT Co Ltd GUANGZHOU CITY
Current assignee: HAODELI ELECTRONIC INDUSTRY DEVELOPMENT Co Ltd GUANGZHOU CITY
Priority date: 1997-12-25
Filing date: 1997-12-25
Publication date: 1999-06-30
Anticipated expiration: 2007-12-25

Abstract

The utility model relates to a miniature direct current welder which is mainly composed of a machine shell (1), a handle (2), a base (3), a bottom board (4), a transformer (5), a rectifier (6), a power supply input socket (7), hemicontinuous conversion binding posts (8), (9) and (10), power supply output positive and negative binding posts (11) and (12), etc. Two U-shaped iron cores with low magnetic leakage and high magnetic induction intensity are adopted to form an O-shaped miniature transformer (5). Two rectifier modules (M1 and M2) with large power are adopted to form the rectifier (6). The rectifier modules (M1 and M2) which are used for connecting two capacitors (13) and (14) which are connected in series in parallel and a resistor (15) are used to form a voltage boosting arc introduction current limiting circuit (16). So a complete machine has small input power, easy arc introduction, stable arc, small size, light weight and convenient portability. The utility model can be suitable for daily illuminating circuits.

Description

A kind of small-sized DC electric welding machine

The utility model relates to a kind of small-sized DC electric welding machine, the particularly improvement of small electrical machine structure.

General dc welding machine all is to utilize the above high voltage of the secondary output 70V of main transformer to carry out striking, during welding since arc characteristic make output voltage drop to 20V thereby cause transformer secondary output internal resistance pressure drop loss big.In order to guarantee that striking carries out easily, require input power big, this must use bulky transformer again.The result causes machine volume, weight to increase, and is not easy to carry, and also is not suitable for the normal lighting circuit.

The purpose of this utility model provides that a kind of input power is little, and striking is easy, and volume is little in light weight, and is easy to carry, can be applicable to the small-sized DC electric welding machine of normal lighting circuit.

Small-sized DC electric welding machine described in the utility model mainly is made up of casing, handle, base, base plate, transformer, rectifier, power input socket, strong and weak conversion binding post, power supply output wiring terminal etc.The iron core of transformer adopts two U sections cores of low magnetism leakage, high magnetic flux density to be combined into the O type, and an end at the secondary output two ends of transformer directly is connected with rectifier, and the other end is connected with power conversion binding post respectively by two leads.Rectifier is made of two powerful rectification modules (M1, M2).A, b, three binding posts of c are arranged on the every rectification module.With copper sheet a-a binding post, b-b binding post are connected, and be connected to power supply and export on the positive and negative binding post.The C binding post of rectification module M1 is connected with the secondary output end of transformer in the rectifier, and the C binding post of another piece M2 is connected with strong and weak conversion binding post.Export between the positive and negative binding post at rectifier and power supply, be parallel with electric capacity and resistance of two series connection.In the middle of two electric capacity of series connection, pick out a lead, be connected on the C binding post of the continuous rectification module of strong and weak conversion binding post.Electric capacity and a resistance of two rectification module two series connection in parallel have been formed the striking current-limiting circuit of boosting.

Adopt small-sized DC electric welding machine of the present utility model, transformer is little, has directly reduced the volume and weight of this machine; The striking current-limiting circuit of boosting, the secondary output voltage of transformer is risen to 2.8 times, the striking voltage height, the starting the arc is easy, arc stability, thereby transformer can adopt lower secondary output voltage, (is lower than 50V, between 25-40V, 30-35V preferably), the loss of transformer secondary output internal resistance pressure drop when reducing welding has reduced input power (only needing 2KW), effectively applicable to the normal lighting circuit.

Further specify the primary structure and the use of small-sized DC electric welding machine of the present utility model below in conjunction with accompanying drawing.

The primary structure schematic diagram of Fig. 1 small-sized DC electric welding machine of the present utility model;

The main circuit schematic diagram of Fig. 2 small-sized DC electric welding machine of the present utility model;

A kind of primary structure of small-sized DC electric welding machine is such: telescopic handle 2 is housed on the casing 1, fixes a base plate 4 on the base 3, transformer 5 is installed, rectifier 6 on the base plate 4.Transformer 5 is by two low magnetism leakages, and the U sections core of high magnetic flux density is combined into the O type, and (M1 M2) constitutes rectifier 6 by two powerful rectification modules.Side at casing 1 is equipped with power input socket 7, and power input socket 7 is connected with the input of transformer 5.The opposite side of casing 1 is equipped with strong and weak

conversion binding post

8,9,10 and power supply is exported positive and negative binding post 11,12.The rectification module of rectifier 6 all has a on each piece, b, and three binding posts of c, the a-a binding post, the b-b binding post connects with two copper sheets, and is connected to power supply and exports on the positive and negative binding post 11,12.In the rectifier 6, the C binding post of rectification module M1 is connected with the secondary output end of transformer, and the C binding post of another piece M2 is connected with strong and weak conversion binding post 9.Export between the positive

negative terminal

11,12 at rectifier 6 and power supply, be parallel with electric capacity 13,14 and resistance 15 of two series connection.In the middle of electric capacity 13,14, pick out a lead, be connected on the C binding post of the rectification module that links to each other with power conversion binding post 9.The electric capacity 13,14 of two rectification module two series connection in parallel and a resistance 15 are formed the striking current-limiting circuit 16 of boosting.

When using small-sized DC electric welding machine of the present utility model to weld, as long as being connected on power supply, the welding gun lead exports positive and negative binding post 11, on 12, according to welding material difference, select strong and weak electric current, promptly power is changed binding post 8 with copper sheet, 9 or 9,10 connect, and then attaching plug are inserted input socket 7, power turn-on switch, electric current is depressurized to through transformer 5 and is lower than 50V, through rectifier 6 rectifications,, just can weld again after the striking current-limiting circuit 16 of boosting converts the secondary output voltage of transformer 5 to 2.8 times direct voltage.After striking finished, electric capacity 13,14 boost functions became current limliting, and the about 20-25VDC function of filtering constant voltage is to reduce the loss of transformer 5.

Claims

A kind of small-sized DC electric welding machine, mainly by casing (1), handle (2), base (3), base plate (4), transformer (5), rectifier (6), power input socket (7), strong and weak conversion binding post (8), (9), (10), power supply output just, negative terminal (11), (12) composition such as, the iron core that it is characterized in that transformer (5) adopts low magnetism leakage, two U sections cores of high magnetic flux density are combined into the O type, one end at the secondary output two ends of transformer (5) directly is connected with rectifier (6), the other end is changed binding post (8) with power respectively by two leads, (10) connect, rectifier (6) is by two powerful rectification module (M1, M2) constitute, on the every rectification module a is arranged, b, three binding posts of c, with copper sheet the a-a binding post, the b-b binding post connects, and just be connected to power supply output, negative terminal (11), (12) on, the C binding post of rectification module M1 is connected with the secondary output end of transformer (5) in the rectifier (6), the C binding post of another piece M2 is connected with strong and weak conversion binding post (9), just exporting at rectifier (6) and power supply, negative terminal (11), (12) between, be parallel with the electric capacity (13) of two series connection, (14) and a resistance (15), in the middle of two electric capacity (13) (14) of series connection, pick out a lead, be connected on the C binding post of the continuous rectification module of strong and weak conversion binding post (9), two rectification module M1, M2, the electric capacity (13) of two series connection in parallel, (14) and a resistance (15) formed the striking current-limiting circuit (16) of boosting.