JPH01169826A - Connecting construction of circuit breaker with overcurrent detecting coil - Google Patents

Abstract

PURPOSE:To facilitate stock management and reduce the cost by equipping one terminal plate for external line corresponding to the max. wire dia., and by connecting with any overcurrent detecting coil having a wire dia. less than it through a cylindrical spacer. CONSTITUTION:A through hole 32a provided in a terminal plate 32 to connect one end of an overcurrent detecting coil 13a with a terminal plate 32 for external shall have a bore which admits insertion of an electric wire having the max. dia. applied to the overcurrent detecting coil 13a, and the thinner end of the detecting coil 13a is inserted into and connected with the through hole 32a through a cylindrical spacer 34. Therefore, the bore of this spacer 34 is suited to the wire dia. of the overcurrent detecting coil 13a while the periphery to the bore DM of the through hole 32a, and now only the terminal plate 32 is required in service. Thereby only one sort of terminal plates should be prepared, which simplifies stock management for parts and the automatic assembly line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a connection structure between an overcurrent detection coil wound around an electromagnetic overcurrent tripping device used in a circuit breaker and an external line terminal.

[Conventional technology]

As this type of connection structure between an overcurrent detection coil and an outside line terminal, the one shown in FIGS. 5 to 9, for example, is known. In the figure, the circuit breaker is divided into upper and lower sections and is divided into poles in an insulating case 1.2. The main components are a contact bag [10] and a flexible conductor 3 connected to the movable contact 6 of the contact device 10. The overcurrent tripping device I is connected to the overcurrent tripping device I, and is connected to the movable contact 6 of the contactor device 10, and controls the connection and separation with the fixed contact 7, and is engaged with the overcurrent tripping device via the tripping mechanism 4. An opening/closing mechanism (9) is housed therein. Contact child bag [10 is a contact support 8 that pivotally supports the above-mentioned movable contact 6 and fixes it to the crossbar 5 that communicates between the poles.
and a contact spring 9 elastically mounted between the movable contact 6 and the contact support 8. The overcurrent tripping device is attached to an L-shaped yoke 1 and a horizontal leg piece 11 of the yoke 1.
an overcurrent detection coil 13 wound around the oil dash port 12, and a shaft 1 near the end of the vertical leg piece 11b of the yoke 11;
4, the movable iron piece 15 is L-shaped and has one side leg piece 15a facing the armature 12a of the oil holder, shoe, and tooth 12, and the other side leg piece 15b can be secured to the tripping mechanism 4. and,
A return spring 16 stretched between the other leg i5b of the movable iron piece 15 and the vertical leg 11b of the yoke 1 is connected to one end of the overcurrent detection coil 13 by soldering to the flexible conductor 3. The main component is a connecting plate 17 connected to the connecting plate 17. At the other end of the overcurrent detection coil 13, the wire diameter of the overcurrent detection coils 13a and 13b is set to dl* depending on the rated current.
dM, so the pore diameters Di, D,
Terminal plates 31 and 32 for external lines having through holes are connected by soldering. The opening/closing mechanism (9) includes an operating handle 21 that is swingably supported, a latch field that can be engaged with a tripping mechanism 4 that is connected to a movable contact 6 via a toggle link n, and a toggle link n. The main component is an opening/closing spring δ which is stretched between the joint pin 24 and the operating handle 21 and reverses its action when the line of action passes the dead center of the toggle link n.

The principle of the previous overcurrent tripping device in the above configuration will be explained with reference to FIGS. 10 to 12.

When the current flowing through the overcurrent detection coil 13 is below the rated current, the attraction force of the plunger 18 is smaller than the force of the back spring 16a, as shown in FIG. 10, and the plunger 18 does not move. In this state, the movable iron piece 15 has a large magnetic resistance and is not attracted to the armature 12a. Next, when the current exceeds the rated current, the attraction force of the plunger 18 is
6a, and moves to the left as shown in Figure 1. Due to the viscosity of the silicone oil 19 sealed in the sharpening cylinder 12b, the moving speed of the plunger 18 has an inverse time-limiting characteristic with respect to the magnitude of the current. When the plunger 18 reaches the armature 12, the magnetic resistance decreases and the movable iron piece 15 is attracted to the armature 123ζ, and this operation operates the opening/closing mechanism shown in FIG. 8, and the contact device 10 performs a breaking operation. If the current is still larger, the magnetic flux of the magnetic circuit of the movable iron piece 15 increases, and as shown in FIG. .

In this way, in the case of this type of overcurrent trip device [20], the attraction force of the plunger 18 is proportional to the product of the current and the number of coil turns (ampere turns), so when changing the rated current, the overcurrent detection coil 13 must be It is necessary to change the number of turns.

Therefore, if the rated current is small, the number of turns will increase and it will not be possible to accommodate it in the coil space, so as mentioned above, if the rated current is small, the wire diameter will be thinner, and if the rated current is large, the current carrying cross section will have to be secured. It was necessary to increase the wire diameter.

[Problem that the invention seeks to solve]

For this reason, in the conventional connection structure between the overcurrent detection coil and the terminal board for external wires, it is necessary to always have a terminal board with a different connection hole diameter for each rating, that is, each wire diameter, which increases the number of parts and makes inventory management difficult. This has the disadvantage that it is troublesome and that the number of parts supply devices on the automatic assembly line increases, making the product expensive.

The purpose of the present invention is to eliminate the above-mentioned conventional drawbacks and to provide a connection structure between an overcurrent detection coil and a terminal plate of a circuit breaker, which uses one type of terminal plate in the same frame regardless of the rated current. be.

[Means for solving problems]

In order to achieve the above-mentioned object, the means of the present invention includes an overcurrent detection coil, which has one end connected to a contactor device of a circuit breaker and is wound around an oil holder, a hole, a bottom, and a bottom of an overcurrent tripping device. A connection structure between an end and a terminal plate for an external wire to which the end is connected through, the through hole provided in the terminal plate having an inner diameter that allows the insertion of a maximum diameter electric wire applied to the overcurrent detection coil, One end of the detection coil is inserted into and connected to the through hole of the terminal plate via a cylindrical spacer. Further, the material of the cylindrical spacer is a conductive material or conductive rubber.

[Effect]

In the connection structure between the overcurrent detection coil and the terminal board according to the present invention, the inner diameter of the through hole to which the current detection coil of the terminal board is connected is such that the maximum applicable diameter wire can be inserted through the through hole, and the wire with a smaller diameter can be inserted through the through hole. By making the connection through the cylindrical spacer, it is sufficient to prepare one type of terminal board, which simplifies component inventory management and automatic assembly V-line.

〔Example〕

Figures 1 and 2 are diagrams showing an embodiment of the connection structure between the overcurrent detection coil and the terminal board of a circuit breaker according to the present invention, with Figure 1 being a plan view and Figure 2 being a side view. be. In this embodiment, if an electric wire with the largest diameter is used for the overcurrent detection coil, it will be the same as the conventional device shown in FIGS. 8 and 9 described above, so a description thereof will be omitted. Therefore, the figure corresponds to the conventional apparatus shown in FIGS. 6 and 7 in which an electric wire having a diameter smaller than the maximum diameter is used, and the same parts are given the same reference numerals to correspond, and differences will be explained. The difference between this embodiment and the conventional device is that the overcurrent detection coil 13a has a wire diameter d1 smaller than the maximum diameter dM to which a through hole 32a with the maximum diameter DM is inserted through a cylindrical spacer. It is said that the terminal board with which it is connected is connected. The cylindrical spacer is made of a conductive material such as a thin copper plate, and is spaced in order to provide springiness in the diametrical direction. A Jy plate 34a is provided, thereby providing a degree of freedom regarding the tolerance of the inner diameter DM of the wire diameter dle through hole 32a. and overcurrent detection coil 1
The connection between the terminal plate 3a and the terminal plate is made by press fitting into the through hole 32a via a spacer or by soldering as in the case of the conventional device.

Next, another embodiment of the present invention will be described with reference to FIGS. 3 and 4. The difference between this embodiment and the previously described embodiments is that conductive rubber is used as the material of the cylindrical spacer. Therefore, the connection between the overcurrent detection coil 13a and the north terminal board is made by the elasticity of the spacer. In this embodiment as well, when an electric wire with the largest diameter is used for the overcurrent detection coil, soldering (not shown) is a connection.

Therefore, in the embodiment shown in FIG. 1, the inner diameter of the spacer is the wire diameter d of the overcurrent detection coil 13a.
・If you always have a terminal plate whose outer diameter matches the inner diameter of the through hole 32a, you can use only the terminal plate, and the elasticity required for energization can be obtained even in the embodiment ζ shown in Figure @3. 1 rubbing is added, but other things may be the same.

〔Effect of the invention〕

According to this invention, one type of terminal board for external wires corresponding to the maximum wire diameter of the overcurrent detection coil employed in the frame is always provided, and a wire terminal board is provided for the overcurrent detection coil with a smaller diameter. By connecting through a spacer, the number of regularly stocked parts is reduced, inventory management is facilitated, and one assembly line is simplified. A connection structure can be provided.

[Brief explanation of the drawing]

FIGS. 1 and 2 show A of the circuit breaker according to the present invention.
Figure 2i is a plan view, Figure 2 is a side view, and Figures 3 and 4 are circuit breaker according to this invention. This is a diagram showing another example of the connection structure between the overcurrent detection coil and the terminal board.
Fig. 3 is a plan view, Fig. 4 is a side view, Figs. A longitudinal sectional view of the main part of the circuit breaker, FIG. 6 is a plan view of the overcurrent tripping device when the wire diameter of the overcurrent detection coil is small, and FIG. 7 is a side view of FIG. 6.
Figure 8 is a plan view of the overcurrent tripping device when the wire diameter of the overcurrent detection coil is the maximum, Figure 9 is a side view of Figure 8, and Figure 10 is a side view of Figure 8.
12 through 12 are explanatory diagrams of the operating principle of the overcurrent tripping device. lO... Contact device, 12... Oiler, Seabo,
G, 13a, 13b... Overcurrent detection coil, addition...
Overcurrent tripping device, 32...Terminal board, 32a...Through hole, A, 35...Space 20 i Abutment 11-
j 9 j) Tatley installation @ 1 Figure s 2 Figure 20 Current drawn to the moromi Completed Tatre Figure 3 Figure 4 Figure 5 Parent b Figure 6 41415 15a Figure 7 Parent Tan Figure 8 Figure 9 Figure 10 Figure 11 Figure 12

Claims (1)

[Scope of Claims] 1) An overcurrent detection coil whose one end is connected to the contact device of the circuit breaker and which is wrapped around the oil dashpot of the overcurrent tripping device and which is connected through the other end of the overcurrent detection coil for an external wire. A connection structure with a terminal board, wherein a through hole provided in the terminal board has an inner diameter through which an electric wire of the maximum diameter applicable to the overcurrent detection coil can be inserted, and one end of the detection coil is connected to the terminal board. A connection structure between an overcurrent detection coil and a terminal plate of a circuit breaker, characterized in that the overcurrent detection coil of a circuit breaker is inserted and connected through a through hole via a cylindrical spacer. 2) A connection structure between an overcurrent detection coil and a terminal board of a circuit breaker, characterized in that the cylindrical spacer is made of a conductive material in the connection structure according to claim 1. 3) A connection structure between an overcurrent detection coil and a terminal board of a circuit breaker, wherein the cylindrical spacer is made of conductive rubber.