JPH0565045U - Flexible copper wire connection fixing structure in circuit breaker - Google Patents

Abstract

(57) [Summary] [Purpose] Connected to the copper wire coil end of the overcurrent trip device and the movable contactor of the circuit breaker, which can be used for both high-rated circuit breakers and low-rated circuit breakers. It is an object of the present invention to provide a fixing structure of a connecting portion with a flexible copper wire terminal. A circuit breaker having a movable contactor 30 for interrupting a current flow of the main circuit 10 in a main circuit 10 through which a current flows, and further including an electromagnetic overcurrent trip device for driving the movable contactor 30. In the container, the terminal 24 (or 54) of the large-diameter electromagnetic copper wire coil 16 or the small-diameter electromagnetic copper wire coil 52 of the electromagnetic overcurrent trip device and the movable contact 3
This is a structure in which the connecting portion of the flexible copper wire 32 connected to 0 to the terminal 34 is inserted and fixed in the fixed tubular member 60. As a result, even if the movable contact 30 moves due to ON / OFF opening / closing operation, the end 54 of the small-diameter electromagnetic copper wire coil 52 is not pulled by the large-diameter electromagnetic copper wire coil 16. ..

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention is a flexible copper that is connected to the end of the coil copper wire of the overcurrent trip device and the movable contact of the circuit breaker in a circuit breaker that automatically shuts off when an overcurrent exceeding the rating flows. The present invention relates to a flexible copper wire connection part fixing structure for fixing a connection part of a wire with an end.

[0002]

[Prior Art]

 3 and 4 show a schematic configuration of a circuit breaker of this type generally known in the past. FIG. 3 shows the case of a circuit breaker with a large rating, in which the current flow of the main circuit 10 is between the power supply terminal 12 provided at one end of the main circuit 10 through which the current flows and the load terminal 14 provided at the other end. An electric circuit breaking mechanism for breaking the electric circuit and an electromagnetic overcurrent trip device for driving the electric circuit breaking mechanism are provided.

As a schematic configuration of the electric circuit breaking mechanism and the electromagnetic overcurrent trip device, an electromagnetic copper wire coil 16 that generates a magnetic force when an overcurrent flows through the main circuit 10 is yoked via a spacer 18. The electromagnetic copper wire coil 16 is attached to one end 22 of the electromagnetic copper wire coil 16 and is connected to the load terminal 14, while the other end 24 of the electromagnetic copper wire coil 16 is connectable to and separable from the contact 26 of the power supply terminal 12. It is connected by spot welding to a terminal 34 of a flexible copper wire 32 connected to one end of a movable contact 30 having a contact 28.

An iron core 36 is inserted in the electromagnetic copper wire coil 16 so as to be movable back and forth in an oil dashpot 38, and a movable electromagnetic piece 40 is attached to the yoke 20 on the top end surface of the oil dashpot 38. It is rotatably attached so that it can come into contact with and separate from it. An engaging member 42 is provided at one end of the movable electromagnetic piece 40, and the engaging member 42 and the movable contact 30 are connected via a trip bar 44.

When an overcurrent flows through the electromagnetic copper wire coil 16, the magnetic force generated in the copper wire coil causes the iron core 36 to start moving up in the oil dash pot 38, and the magnetic force gradually increases, whereby the movable electromagnetic piece 40. Is attracted to the oil dashpot 38, and as a result, the engagement between the movable electromagnetic piece 40 and the engagement member 42 is released, and the movable contact 30 and the contacts 26, 28 of the power supply terminal 12 are separated from each other. The current flow in the main circuit 10 is cut off.

An on / off switching handle 48 of the circuit breaker is connected to the trip bar 44 via a link 46, and the switching handle 48 is turned on when the main circuit 10 is cut off. Switched off. The flexible copper wire 32 is inserted into the zero-phase current transformer 50 for detecting the leakage current on the way, but this is not directly related to the present invention, and therefore the detailed description will be omitted.

On the other hand, FIG. 4 shows a case of a circuit breaker with a low rating, and in this case, an electromagnetic copper wire coil 52 having a smaller diameter than that of a circuit breaker with a high rating is used. Then, by only directly connecting the end 54 of the electromagnetic copper wire coil 52 and the end 34 of the flexible copper wire 32 by spot welding, the movable contact 30 is turned on and off each time the ON / OFF operation is performed. When the flexible copper wire 32 is pulled by the rotation of, the bent portion 56 near the end 54 of the electromagnetic copper wire coil 52 may cause metal fatigue and break, resulting in a state where it cannot be used.

Therefore, when the rating is small as shown in FIG. 4, a conductive connecting plate 58 is fixedly provided on the yoke 20, and the terminal of the electromagnetic copper wire coil 52 is attached to the connecting plate 58. 54 and the end 34 of the flexible copper wire 32 were connected by spot welding. Incidentally, in the embodiment of FIG. 4, the same reference numerals are given to the constituent parts which are the same as those shown in FIG.

[0009]

[Problems to be solved by the device]

 However, if the connection structure between the copper wire coil and the flexible copper wire is different due to the difference in rating as described above, when connecting the copper wire coil and the flexible copper wire with the connection plate, the connection plate is To fix it, another accessory was needed, or the base structure had to be changed.

In addition, when connecting the copper wire coil and the flexible copper wire, the necessity of the connecting plate is generated depending on the rating of the circuit breaker, and extra part management is required. Furthermore, depending on the rating of the circuit breaker, it may be necessary to use a connecting plate, so it was necessary to change the work content in the assembly process.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a terminal of a copper wire coil of an overcurrent trip device in a circuit breaker and a circuit breaker. An object of the present invention is to provide a flexible copper wire connecting portion fixing structure in which a connecting portion of a flexible copper wire connected to a movable contact and an end thereof can be more easily fixed. As a result, it is possible to simplify the management of assembly parts even if the ratings of the circuit breakers are different, and to standardize the assembly work contents, thereby improving work efficiency.

[0012]

[Means for Solving the Problems]

 In order to achieve this object, the flexible copper wire connecting portion fixing structure of the present invention has a main circuit through which a current flows and has an electric circuit interruption mechanism for interrupting the current flow of the main circuit. In a circuit breaker equipped with an electromagnetic overcurrent trip device for driving, a terminal of a copper wire coil of the electromagnetic overcurrent trip device and an end of a flexible copper wire connected to a movable contact of the electric circuit interruption mechanism. It has a structure in which the connecting portion to and is fixed to the fixed cylindrical member.

[0013]

[Action]

 According to the flexible copper wire connecting portion fixing structure of the present invention configured as described above, if an overcurrent flows in the main circuit of this circuit breaker, the electromagnetic overcurrent trip device and the electric circuit interruption mechanism will be provided. It works and the current flow of the main circuit is cut off. At that time, the flexible copper wire connected to the movable contact of the electric circuit breaking mechanism is pulled, but since the end of this flexible copper wire is held by the fixed tubular member, its pulling force is connected to the flexible copper wire. It does not extend to copper wire coils. Therefore, when the copper wire coil has a high rating, it has a small diameter with a small rating, and deterioration of the bent portion due to metal fatigue is avoided.

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In the embodiment of this idea, the same components as those of the conventional structure are designated by the same reference numerals, and the detailed description thereof will be omitted.

Therefore, as shown in FIG. 1, the present invention is configured such that the connection portion of the end of the copper wire coil and the end of the flexible copper wire by spot welding is fixed via the fixed tubular member 60. Is.

The fixed cylinder member 60 is made of synthetic resin and is connected to the outer side surface of the fixed cylinder body 62 fitted and fixed to the oil dash pot 38 protruding from the bottom surface of the yoke 20. A clamp cylinder body 66 extends through the piece 64. The clamp cylinder 66 has an inner diameter that allows the end of the large-diameter electromagnetic copper wire coil 16 used in a circuit breaker with a large rating to be inserted, and the side surface is slightly smaller than the diameter of the flexible copper wire 32. A slit groove 68 having a dimension width is formed in the cylinder direction.

Therefore, in order to fix the connecting portion between the terminal 22 of the electromagnetic copper wire coil 16 and the terminal 34 of the flexible copper wire 32 using the fixed tubular member 60, the fixed tubular member of the fixed tubular member 60 is fixed. 62 is inserted into the oil dashpot 38 projecting from the bottom surface of the yoke 20 to be fitted and fixed, and the connecting portion between the electromagnetic copper wire coil 16 and the flexible copper wire 32 is inserted into the clamp cylinder 66. By doing.

At this time, if the fixed cylinder member 60 itself is made of synthetic resin as described above, the slit groove 68 of the clamp cylinder body 66 can be easily expanded with elasticity, so that the slit groove 68 is The end 22 of the electromagnetic copper wire coil 16 may be inserted into the clamp cylinder 66 with the end 34 of the flexible copper wire 32 inserted.

Then, in a state where the connecting portion between the electromagnetic copper wire coil 16 and the flexible copper wire 32 is mounted on the clamp cylinder 66, the end 34 of the flexible copper wire 32 is located at the slit groove of the clamp cylinder 66. It is held in a state of being elastically attached to 68, and the fixed cylinder member 60 itself is fixed to the yoke 20.

FIG. 2A shows a state in which the connecting portion of the large-diameter electromagnetic copper wire coil 16 and the flexible copper wire 32 in the circuit breaker with a high rating is fixed by the fixed tubular member 60, and FIG. b) shows a state in which the connecting portion between the end 54 of the small-diameter electromagnetic copper coil 52 and the end 34 of the flexible copper wire 32 in the circuit breaker with a low rating is fixed by the fixed tubular member 60. However, in any case, the same fixed tubular member 60 can hold the connection between the copper wire coil and the flexible copper wire in a stationary state.

Therefore, even if the movable contact 30 moves due to the interruption of the main circuit 10 and the flexible copper wire 32 is pulled every time the ON-OFF opening / closing operation is performed, the large-diameter electromagnetic copper coil 16 In addition to the case, the end of the small-diameter electromagnetic copper wire coil 52 is not pulled by it. Therefore, it is possible to avoid the metal fatigue of the bent portion 56 near the end 54 of the small-diameter electromagnetic copper wire coil 52 in the circuit breaker having a particularly low rating, as in the conventional case.

Although the fixed cylinder member 60 is mounted and fixed to the oil dash pot 38 in the above embodiment, it is not limited to this. For example, a pin may be provided so as to project from the yoke 20 and be attached thereto. The point is that the fixed cylinder member 60 may be fixedly provided to the yoke 20 or another member by some means. is there.

[0023]

[Effect of the device]

 As is clear from the above description, according to the flexible copper wire connecting portion structure of the present invention, even if the movable contact of the overcurrent breaking mechanism moves due to the ON / OFF opening / closing operation, etc. Since the connection part with the copper wire is held by the fixed cylinder member so that it does not move, the problem of service life due to metal fatigue at the terminal bending part of the copper wire coil does not occur, and even when the rating of the circuit breaker is large. Even when the size is small, this fixed cylinder member can be shared, which makes it easier to manage parts, and it is not necessary to change the work content due to the difference in ratings in the assembly process, and it is possible to assemble with the same work content, contributing to the improvement of the assembly workability It is a sipping thing. In addition, if the fixed cylinder member configured as in the above-mentioned embodiment is used, it can be detached with one touch, and thus the working time can be greatly reduced. Can be expected to improve. Furthermore, although there was a risk of breaking the insulating tube that covers the flexible copper wire by the end of the copper wire coil in the past, the invention can be used regardless of the wire diameter size of the copper wire coil, so damage to the insulating tube can be prevented. Also, by fixing the end of the copper wire coil, it is expected to stabilize the circuit cutoff performance, etc., and its practical value is great.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a schematic configuration of a flexible copper wire connecting portion fixing structure according to an embodiment of the present invention.

FIG. 2 is a diagram showing a state in which the fixed cylinder member according to one embodiment of the present invention shown in FIG. 1 is applied to a circuit breaker with a large rating and a circuit breaker with a small rating.

FIG. 3 is a schematic configuration diagram of a flexible copper wire connection portion fixing structure in a conventional circuit breaker with a large rating.

FIG. 4 is a schematic configuration diagram of a flexible copper wire connecting portion fixing structure in a conventional circuit breaker with a low rating.

[Explanation of symbols]

 10 Main Circuit 16 Electromagnetic Copper Wire Coil 22 Terminal 30 Movable Contact 32 Flexible Copper Wire 34 Terminal 52 Electromagnetic Copper Wire Coil 54 Terminal 60 Fixed Cylindrical Member 66 Clamp Cylindrical Body 68 Slit Groove

Claims (1)

[Scope of utility model registration request] 1. A circuit breaker having a main circuit through which a current flows has an electric circuit breaking mechanism for cutting off a current flow of the main circuit, and further provided with an electromagnetic overcurrent trip device for driving the electric circuit breaking mechanism. The connection portion between the end of the copper wire coil of the electromagnetic overcurrent trip device and the end of the flexible copper wire connected to the movable contact of the electric circuit breaking mechanism is inserted and fixed in a fixed tubular member. Flexible copper wire connection part fixing structure in a circuit breaker characterized by the above.