JPH0677067A - Transformer - Google Patents

Abstract

PURPOSE:To protect windings against disconnection caused by insertion by a method wherein the winding start end and winding terminal end of a coil are connected to terminal pins as tied down at a point slightly higher than the lower end of the terminal pin instead of being put in mounting holes. CONSTITUTION:A ring-shaped iron core 1 where a secondary winding is wound is housed in a ring-shaped cup 3a of a case 3. A winding start end 2a and a winding terminal end 2b are connected to terminal pins 5 as tied down at a point 7 higher than the tip of the terminal by a certain length. That is, the above point 7 is set higher than a mounting hole 4. By this setup, a transformer where the terminal pins 5 can be easily and surely kept enough in pitch and winding wires are protected enough against disconnection can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer suitable for a zero-phase current transformer used for an earth leakage alarm device, an earth leakage breaker, etc., and a current transformer for detecting an overcurrent, and more particularly to a printed circuit board. The present invention relates to a transformer with a terminal pin having excellent performance.

[0002]

2. Description of the Related Art FIG. 3 and FIG.
It is the top view and the longitudinal cross-sectional view which show the conventional transformer shown by 12627 gazette, and has shown the structure as a zero phase current transformer. In these figures, 1 is an annular core around which a secondary winding is wound, 2a and 2b are winding start and end portions of the secondary winding, and 3 is an annular core 1 accommodated in a central annular cup portion 3a. Insulating case 4 made of synthetic resin described above, 4 is a pin mounting hole provided at both ends 3b which are ears of the insulating case 3, and 5 is a terminal pin having one end inserted into each pin mounting hole 4,
The winding start portion 2a and the winding end portion 2b of the winding are slightly wound and connected to each other. Reference numeral 7 indicates the connecting portion. 8
Is a positioning member for the terminal pin 5, and the terminal pin 5 has a mounting hole 4
Inside the positioning member 6 and the end portions 3 of the insulating case 3
It is roughly positioned by the recess 3c provided in b. An insulating material 6 is filled in the insulating case 3, and the ring-shaped iron core 1 and the terminal pins 5 having the windings are fixed in the insulating case 3.

In the transformer configured as the zero-phase current transformer as described above, the annular core 1 around which the secondary winding is wound is housed in the annular cup 3a of the insulating case 3 and the secondary winding is also provided. The terminal pin 5 connecting the winding start portion 2a and the winding end portion 2b at one end side is inserted into the mounting holes 4 at both end portions 3b of the insulating case 3, and the annular core 1 and the terminal pin 5 are the insulating case. It is fixed by filling an insulating material 6 in the inside 3. Here, the terminal pins 5 are positioned by placing the bottoms in the recesses 3c provided at the both end portions 3b of the insulating case 3 and by inserting the terminal pins 5 into the positioning members 8 arranged in the mounting holes 4. ing. Then, the insulating material 6 is filled in the space inside the mounting hole 4 that accommodates the winding end portion of the secondary winding,
As a result, the terminal pin 5 is fixed to the both end portions 3b of the insulating case 3.
It is fixed to. That is, the lower end of the terminal pin 5 is locked in the recess 3c at the bottom of the mounting hole 4, and the positioning member 8 to which the terminal pin 5 is fitted is attached to the through hole 8 without rattling from the upper portion thereof. , So that the terminal pin 5 is positioned in the mounting hole 4. In addition, the structure of the zero-phase current transformer is shown as in the prior art.

In the figure, 1 is an annular core around which a secondary winding is wound, and 2a and 2b are winding start and end portions of the secondary winding.
3 is an insulating case in which the annular core 1 is housed in the annular cup portion 3a, 4 is a mounting hole provided at both end portions 3b of the insulating case 3,
Reference numeral 5 denotes a terminal pin fixed by inserting one end into the mounting hole 4, to which the winding start portion 2a and the winding end portion 2b of the secondary winding are connected. Reference numeral 6 denotes an insulating material filled in the insulating case 3, the annular core 1 and the terminal pin 5 having the secondary winding.
Is fixed. Numeral 9 is a positioning collar provided on the side surface on one end side of the terminal pin 5, and is formed as a protruding portion having an outer diameter close to the hole diameter of the mounting hole 4 of the insulating case 3.

[0005]

The conventional transformer shown in FIGS. 3 and 4 is constructed as described above, and the terminal pins to which the winding start portion and the winding end portion of the winding are connected are Since the positioning member having the two fitting insertion portions and the positioning recess hold it at a predetermined position, it is difficult to process the positioning component of the terminal pin, and it is not easy to assemble and the number of processes increases. There was a point. That is, the positioning accuracy of the terminal pin, the degree of rattling, and the difficulty of mounting are related to both the internal fitting accuracy of the positioning member with respect to the mounting hole and the external fitting accuracy of the through hole with respect to the terminal pin. There is a problem that it is difficult to process the positioning member and the recess because the accuracy of the recess is involved, and the fitting and inserting process at the time of assembly is not easy. Further, the conventional transformer shown in FIGS. 5 and 6 is the improved type shown in FIGS. 3 and 4, and is characterized in that the positioning member is unnecessary and the fitting step is unnecessary. However, if you do not pay enough attention when inserting the terminal pin into the mounting hole, it has a quality defect that the winding start part or the winding end part of the coil is pinched by the mounting hole and the terminal pin collar and leads to disconnection. .

[0006]

In the transformer according to the present invention, the winding start portion and the winding end portion of the coil are twisted and connected to the terminal pin slightly above the bottom of the terminal pin to be twisted and connected. The part is designed not to be stored in the mounting hole.

[0007]

In the transformer of the present invention, when the terminal pin is inserted into the mounting hole, the connecting end is not broken because the coil end is not tangled to the inserted portion.
Further, since the clearance between the terminal pin and the mounting hole is small, the terminal pitch can be sufficiently satisfied.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a top view of a transformer showing an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view thereof, showing the structure of the transformer. Note that the same or corresponding parts as those of the conventional example are represented by the same reference numerals. In FIGS. 1 and 2, 1 is an annular core around which a secondary winding is wound, 2a and 2b are winding start and end portions of the secondary winding, and 3 is an annular cup part 3a at the center of the annular core 1. Insulation case made of synthetic resin housed in 4 is a pin mounting hole provided on both side ends 3 which are ears of the insulation case 3, and 5 are terminal pins having one end inserted into each pin mounting hole. The winding start portion 2a and the winding end portion 2b of the winding are slightly wound and connected. Reference numeral 7 indicates the connecting portion. An insulating material 6 is filled in the insulating case 3, and the ring-shaped iron core 1 and the terminal pins 5 having the windings are fixed in the insulating case 3. 7 and 8 are a front view and a side view of the terminal pin 5 used in the present invention. Reference numeral 10 is a dowel formed on the terminal pin 5, and prevents the wire twisted on the twisted connection portion 7 from sliding up and down.

The operation will be described based on the above configuration. First, the annular iron core 1 around which the secondary winding is wound is housed in the annular cup portion 3 a of the case 3. The winding start portion 2a and the winding end portion 2b of the winding are connected to the terminal pin 5 by tangling, and the position of the connecting portion 7 is located above the tip of the terminal by a predetermined position. That is, the height is higher than the height of the mounting hole 4. By doing this,
The barb connection 7 is no longer inserted into the mounting hole, and therefore the barb connection, as described with reference to FIGS. 5 and 6, is completely prevented from being caught in the mounting hole and broken. or,
Since the barbed connection does not go into the mounting hole, the clearance between the terminal pin and the mounting hole can be set as small as possible, so there is almost no rattling when the terminal pin is put into the mounting hole, and the required pin pitch of the terminal pin is reduced. It can be sufficiently satisfied, and the positioning member 8 used in FIGS. 3 and 4 is unnecessary. As a specific example, when the terminal pin diameter is 0.8 and the wire diameter of the winding is 0.1, the hole diameter of the mounting hole is set to about 0.87. Therefore, the clearance is 0.07 in diameter, and the wire diameter is φ0.1 or the connecting portion 7 which is spliced in one layer.
The minimum diameter is 1.0, and it is impossible to insert it in the mounting hole.

[0010]

As described above, according to the present invention, since the connecting portion for connecting the winding terminal to the terminal pin is connected to the position where it is not inserted into the mounting hole, the pin pitch of the terminal pin can be easily secured. It is possible to obtain a transformer that can prevent wire wire breakage.

[Brief description of drawings]

FIG. 1 is a top view of a transformer of the present invention.

FIG. 2 is a vertical cross-sectional view of FIG.

FIG. 3 is a top view of Conventional Example 1.

FIG. 4 is a vertical sectional view of FIG.

FIG. 5 is a top view of Conventional Example 2.

6 is a vertical cross-sectional view of FIG.

FIG. 7 is a front view of a terminal pin used in the transformer of the present invention.

FIG. 8 is a side view of FIG. 7.

[Explanation of symbols]

 1 Annular iron core 2a, 2b Winding start and winding end of secondary winding 3 Insulation case 3a Annular cup part of insulation case 3b Both ends of insulation case 4 Pin mounting holes 5 Terminal pin 6 Insulation material 7 Connection part 8 Positioning Material 9 Collar 10 Dowel

Claims (2)

[Claims] 1. An iron core around which a winding is wound, and a terminal pin to which a winding start portion and a winding end portion of this winding are respectively connected,
In a transformer that is housed in an insulating case that has terminal pin mounting holes and is filled and fixed with an insulating material, the mounting hole does not contain the part where the winding is connected to the terminal pin. And a transformer. 2. The transformer according to claim 1, wherein terminal pins having dowels slightly thicker than a wire diameter of the winding are used above and below a portion where the winding is connected by twisting.