JP3535906B2 - Transformer with rectifier - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer in which a rectifier is connected to a secondary coil of a transformer, and a center tap terminal is derived from an intermediate portion of the secondary coil. The present invention relates to a transformer device with a rectifier. 2. Description of the Related Art Conventionally, a transformer device in which rectifiers are interposed at both ends of a secondary coil of a transformer is often used, for example, incorporated in a resistance welding device. In this transformer device, usually, a conductive member having a plurality of rectifiers is directly connected to a winding start end and a winding end end of a secondary coil, and is derived from an intermediate portion of the secondary coil. The center tap terminal is connected to one of the welding gun arms, and the conductive member is connected to the other welding gun arm. The welding operation is performed by supplying a DC current to these welding gun arms. [0003] However, in the above structure, a conductive member having a rectifier interposed is directly connected to each end of the secondary coil. For this reason, it has been pointed out that it is difficult and time-consuming to process the conductive member mounting surface of the secondary coil in order to ensure accuracy in consideration of the contact surface resistance and the like. Further, when the conductive member is replaced due to damage to the rectifier, etc., a correction or adjustment work is required due to the manufacturing error of the secondary coil or the conductive member itself, and the replacement work is performed more efficiently. It has been pointed out that this is not the case. In addition, when the conductive member is mounted or replaced, an excessive force is likely to be applied to the rectifier mounting surface of the conductive member, and the contact surface resistance increases, which may cause a deterioration in the quality of the transformer device. The present invention solves this kind of problem, and provides a transformer device with a rectifier capable of improving the mountability and workability of the entire device and efficiently performing a rectifier replacement operation. The purpose is to: In order to achieve the above object, the present invention provides a transformer having a rectifier connected to a secondary coil thereof, and a center tap terminal connected to an intermediate portion of the secondary coil. Is a transformer device with a rectifier from which
A pair of conductor members each connected to a winding start end and a winding end end of the next coil and provided with an insulating material that insulates the output of each end, and a plurality of rectifiers are provided.
A rectifier unit having an output terminal and two or more input terminals, and connected to the two or more input terminals and the conductor member to connect the two or more input terminals to each of the ends. Two or more conductive positioning members,
It is characterized by having. In the transformer device with a rectifier according to the present invention, a conductor member is connected to each of a winding start end and a winding end of a secondary coil, and each input of a rectifier unit in which a plurality of rectifiers are disposed. A terminal is connected to the conductor member via a conductive positioning member. For this reason, the input terminal of the rectifier unit and each end of the secondary coil are not directly connected, and the work of processing the secondary coil is simplified. Moreover,
Since the positioning member is provided, it is possible to reduce the processing accuracy of the rectifier unit itself and improve the mountability of the rectifier unit, and to apply an excessive force to the rectifier mounting surface when mounting or replacing the rectifier unit. Therefore, it is possible to prevent the contact surface resistance from increasing. An embodiment of a transformer device with a rectifier according to the present invention will be described below in detail with reference to the accompanying drawings. 1 to 3, reference numeral 10 denotes
1 shows a transformer device with a rectifier according to the present embodiment. The transformer device 10 includes a casing 12, in which a secondary coil 14 having two turns is provided corresponding to a primary coil (not shown). The secondary coil 14 has both ends 16, 18 which are a winding start end and a winding end, and a center tap terminal plate 20 is led out from a connection portion of each turn, that is, an intermediate portion. . End 1 of secondary coil 14
6, 18 are connected to conductive plates 22, 24, respectively, and between the conductive plates 22, 24, each end portion 16, 18 is connected.
An insulating material 26 for insulating the output of the first and second components is interposed. Conductive plate 2
A resin layer 27 of an epoxy resin is formed between 2, 2 and the center tap terminal plate 20. As shown in FIG. 4, a passage 28a for introducing cooling water is formed in the conductive plate 22.
8 a communicates with a passage 30 from the end 16 of the secondary coil 14 through the center tap terminal plate 20 to the end 18. The passage 30 communicates with a passage 28 b formed in the conductive plate 24 for discharging the cooling water. A rectifier unit 36 is connected to the conductive plates 22 and 24 via conductive positioning members 32 and 34. The positioning members 32 and 34 are made of a substantially L-shaped conductive plate. A pair of holes 40 are formed on one surface of the conductive plates 22 and 24 corresponding to the pair of screw holes 38 respectively formed on the conductive plates 22 and 24. You. Similarly, a pair of holes 42 are formed on the other surface of the positioning members 32 and 34. The rectifier unit 36 includes an output terminal plate 44
And a plurality of, for example, two input terminal plates 46, 48. The output terminal plate 44 and the input terminal plates 46, 4
8, rectifiers 50, 52 are provided with rectifier protection plates 54,
It is interposed via 56. The input terminal plates 46 and 48 project in opposite directions, and a pair of screw holes 58 is formed at each of the projected ends. A pressing plate 60 is disposed on the input terminal plate 48 side via a disc spring (not shown), and a clamping plate 62 is disposed on the input terminal plate 46 side. The pressing plate 62 passes through the pressing plate 60 from the clamping plate 62 side. When the four bolts 64 are inserted, the rectifier unit 3
6 are integrally formed. As shown in FIG. 2, positioning members 32, 3
4, a cooling water passage 70a of the input terminal plates 46 and 48;
The cooling water passages 72a and 72b communicating with the cooling water passage 70b are formed in the output terminal plate 44.
Is formed. Next, the operation of assembling the transformer device 10 configured as described above will be described. First, in the rectifier unit 36, the rectifier 5
The output terminal plate 44 and the input terminal plates 46 and 48, in which the reference numerals 0 and 52 are interposed via the rectifier protection plates 54 and 56, are integrated via bolts 64 while being sandwiched between the holding plate 60 and the tightening plate 62. Fixed. On the other hand, on the secondary coil 14 side,
Positioning members 32, 34 are fixed to the conductive plates 22, 24, and rectifier units 36 are attached to the positioning members 32, 34.
Are connected. That is, the positioning members 32 and 34 are fixed to the conductive plates 22 and 24, respectively, by the bolts 66 passing through the holes 40 and being screwed into the screw holes 38. The diameter of the hole 40 is set to be larger than the diameter of the bolt 66, and the positioning members 32 and 34 can be adjusted in position through the clearance of the hole 40. The holes 42 of the positioning members 32, 34
A bolt 68 penetrates through the input terminal plate 4.
6 and 48 are screwed into the screw holes 58. As a result, the input terminal plate 46 is connected to the end 16 of the secondary coil 14 via the positioning member 32 and the conductive plate 22, while the input terminal plate 48 is connected to the end member 16 via the positioning member 34 and the conductive plate 24. Connected to end 18 of secondary coil 14. In addition, a predetermined clearance is provided between the hole 42 and the bolt 68. When the transformer device 10 is incorporated in, for example, a resistance welding device, the center tap terminal plate 2
0 is connected to one of the welding gun arms (not shown), and the output terminal plate 44 is connected to the other welding gun arm (not shown). A DC current is supplied to these welding gun arms to perform the welding operation. Is done. In this case, in this embodiment, the secondary coil 14
The end plates 16 and 18 are connected to conductive plates 22 and 24, and the conductive plates 22 and 24 are connected to input terminal plates 46 and 48 via positioning members 32 and 34. Therefore, the input terminal plate 4 is directly connected to the ends 16 and 18 of the secondary coil 14.
The end portions 16 and 1 required for connecting the 6, 48
8 eliminates the need for high-precision machining of the mounting surface, and has the advantage of simplifying machining of the secondary coil 14. Further, positioning members 32 and 34 are provided, and holes 4 formed in the positioning members 32 and 34 are provided.
The relative positions of the conductive plates 22 and 24 and the input terminal plates 46 and 48 can be adjusted via the clearances 0 and 42. Thereby, the processing accuracy of the rectifier unit 36 itself can be effectively reduced, and the rectifier unit 3
6 can be improved at once. Further, when the rectifier unit 36 is replaced due to damage to the rectifiers 50, 52, the relative positions of the input terminal plates 46, 48 and the conductive plates 22, 24 are determined via the positioning members 32, 34. The rectifier unit 36 can be adjusted quickly and easily. When the rectifier unit 36 is mounted or replaced, the input terminal plates 46 and 48 are fixed to one surface of the positioning members 32 and 34 via bolts 68, and the other surfaces of the positioning members 32 and 34 are It is fixed to the conductive plates 22 and 24 via bolts 66. As a result, no excessive force acts on the rectifier mounting surfaces of the input terminal plates 46 and 48, and the contact surface resistance of the rectifiers 50 and 52 can be reliably prevented from increasing, and the quality of the transformer device 10 can be improved. The effect that it can be easily achieved is obtained. In this embodiment, two input terminal plates 4
6, 48, but when the number of rectifiers 50, 52 is increased, the input terminal plates 46, 4
What is necessary is just to increase the number of 8 and the number of positioning members 32,34. As described above, according to the transformer device with a rectifier according to the present invention, the following effects and advantages can be obtained. The input terminal of the rectifier unit in which a plurality of rectifiers are arranged is not directly connected to the winding start end and the winding end end of the secondary coil, which simplifies the work of processing the secondary coil. I do. Moreover, since the positioning member is provided, the processing accuracy of the rectifier unit itself can be reduced and the mountability of the rectifier unit can be improved, and an excessive force is applied to the rectifier mounting surface when the rectifier unit is mounted or replaced. It is possible to prevent the contact surface resistance from increasing. Thereby, the rectifier replacement work is efficiently performed, and the quality of the transformer device is easily improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a main part of a transformer device with a rectifier according to the present invention. FIG. 2 is a plan view of the transformer device. FIG. 3 is a side view of the transformer device. FIG. 4 is a circuit diagram of a cooling water circuit on a secondary coil side of the transformer device. [Description of Signs] 10 ... Transformer device 14 ... Secondary coil 16, 18 ... End 20 ... Center tap terminal plate 22, 24 ... Conductive plate 26 ... Insulating material 32, 34 ... Positioning member 36 ... Rectifier unit 44 ... Output terminal Boards 46, 48 ... input terminal boards 50, 52 ... rectifiers

Claims (1)

(1) A transformer device with a rectifier, wherein a rectifier is connected to a secondary coil of the transformer, and a center tap terminal is led out from an intermediate portion of the secondary coil. A pair of conductor members respectively connected to a winding start end and a winding end end of the secondary coil, and provided with an insulating material interposed between the ends of the secondary coil to insulate the output of each end; and a plurality of rectifiers are provided. A rectifier unit having an output terminal and two or more input terminals; and connecting the two or more input terminals to the conductor member to connect the two or more input terminals to any one of the ends. A transformer device with a rectifier, comprising: two or more conductive positioning members.