JP2021012759A - Electromagnetic trip device for circuit breaker - Google Patents

Abstract

To provide an electromagnetic trip device for a circuit breaker that can be assembled more easily as compared with a prior art.SOLUTION: A movable electromagnetic piece 22 is assembled to a joint iron 21 in a state where the movable electromagnetic piece 22 penetrates through an opening 27 formed in the joint iron 21 in a front-and-rear direction, and a first fitting projection 28 which projects downward is provided at an upper edge of the opening 27 of the joint iron 21. A second fitting protrusion 29 which projects upward is provided at a position facing the first fitting protrusion 28 in the movable electromagnetic piece 22. As urging means for urging the movable electromagnetic piece 22 to a normal posture side, a compression spring 23 formed in a coil-spring-like shape is provided while the first fitting projection 28 is fitted on one end side and the second fitting projection 29 is fitted on the other end side.SELECTED DRAWING: Figure 3

Description

The present invention relates to an electromagnetic trip device for a circuit breaker that operates so as to detect an excessive current such as a short-circuit current flowing through an electric circuit and cut off the electric circuit.

Conventionally, a circuit breaker may be provided with an electromagnetic tripping device that operates to detect an excessive current such as a short-circuit current flowing through an electric circuit and cut off the electric circuit (for example, Patent Document 1). ). Here, the conventional electromagnetic trip device 51 will be briefly described with reference to FIG. The electromagnetic trip device 51 is assembled to a fixed electromagnetic piece 52 and a fixed electromagnetic piece 52 fixed to the main body case of the circuit breaker, and the movable electromagnetic piece whose posture can be changed between the normal posture and the breaking posture. The 53 and the tension spring 54 formed in the shape of a coil spring interposed between the fixed electromagnetic piece 52 and the movable electromagnetic piece 53 are provided. One end of the tension spring 54 is hooked to the fixed electromagnetic piece 52 and the other end is hooked to the movable electromagnetic piece 53, respectively, and the movable electromagnetic piece 53 is urged toward the normal posture side by a load in the contracting direction. In such an electromagnetic trip device 51, when a current exceeding a predetermined value flows through the electric circuit arranged in the circuit breaker, the movable electromagnetic piece 53 cuts off from the normal posture against the urging force of the tension spring 54. The electric circuit is cut off by changing the posture to the posture and operating a blocking mechanism unit (not shown) in accordance with the changing posture of the movable electromagnetic piece 53. Reference numeral 55 is a coil portion for generating an electromagnetic force that attracts the movable electromagnetic piece 53 when an excessive current flows, and 56 is an iron core installed so as to penetrate the coil portion.

JP-A-2015-170383

However, the above-mentioned conventional electromagnetic trip device has a problem that the assembly work, particularly the installation work of the tension spring is troublesome.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide an electromagnetic trip device for a circuit breaker that can be assembled more easily than before.

In order to achieve the above object, the present invention is assembled on a fixed electromagnetic piece fixed to the main body case of the circuit breaker and the fixed electromagnetic piece, and the posture can be changed between the normal posture and the breaking posture. It is provided with a movable electromagnetic piece, an urging means interposed between the fixed electromagnetic piece and the movable electromagnetic piece, and urging the movable electromagnetic piece toward the normal posture side, and is arranged in the main body case. A circuit installed in the electric circuit, and when a current exceeding a predetermined value flows through the electric circuit, the movable electromagnetic piece changes its posture from the normal posture to the cutoff posture against the urging force of the urging means. An electromagnetic trip device for a circuit breaker, in which the movable electromagnetic piece is assembled to the fixed electromagnetic piece in a state of penetrating the opening provided in the fixed electromagnetic piece, and the opening edge of the fixed electromagnetic piece. Is provided with a first fitting protrusion protruding toward the movable electromagnetic piece, while a second fitting protrusion protruding toward the first fitting protrusion side at a position facing the first fitting protrusion on the movable electromagnetic piece. The fitting protrusion is provided, and the compression spring formed in the shape of a coil spring is urged in a state where the first fitting protrusion is fitted on one end side and the second fitting protrusion is fitted on the other end side. It is characterized in that it is provided as a means.

According to the present invention, in a state in which a movable electromagnetic piece is assembled to a fixed electromagnetic piece with an opening formed in the fixed electromagnetic piece penetrated, the movable electromagnetic piece protrudes toward the movable electromagnetic piece at the opening edge of the fixed electromagnetic piece. While the fitting protrusion 1 is provided, a second fitting protrusion protruding toward the first fitting protrusion side is provided at a position facing the first fitting protrusion in the movable electromagnetic piece. Then, as a urging means for urging the movable electromagnetic piece toward the normal posture side, a compression spring formed in the shape of a coil spring is fitted with a first fitting protrusion on one end side and a second fitting protrusion on the other end side. It was provided in a state of being allowed. Therefore, compared to the conventional electromagnetic tripping device that uses a tension spring as the urging means and hooks both ends of the tension spring to the fixed electromagnetic piece and the movable electromagnetic piece, respectively, the installation of the urging means and eventually the urging means The electromagnetic tripping device can be easily assembled.

It is a perspective explanatory view which showed the circuit breaker which the cover member was removed. It is explanatory drawing which showed the cross section in the front-rear direction of a circuit breaker. It is a perspective explanatory drawing which showed the electromagnetic trip device which concerns on this invention. It is a perspective explanatory view which showed the conventional electromagnetic trip device.

Hereinafter, a circuit breaker including an electromagnetic trip device according to an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective explanatory view showing a circuit breaker 1 from which the cover member has been removed. FIG. 2 is an explanatory view showing a cross section of the circuit breaker 1 in the front-rear direction. FIG. 3 is a perspective explanatory view showing the electromagnetic trip device 11.

The circuit breaker 1 has a main body case made of synthetic resin in which a cover member (not shown) is assembled so as to cover the base 2 above the base 2, and a power supply is provided at the rear of the main body case. A side terminal 4 is provided, and a load side terminal 3 is provided at the front portion. Further, on the base 2, three electric lines extending in the front-rear direction are arranged side by side in order to electrically connect the load side terminal 3 and the power supply side terminal 4. Each electric circuit is provided with a first fixing bracket 5 which extends rearward from the load side terminal 3 and is a component of the front electric circuit, and a fixed contact 7 at the front end, and extends forward from the power supply side terminal 4 to form a rear electric circuit. A movable contact 8 is provided at the second fixing bracket 6 and the rear end, and the movable contact 8 is brought into contact with / separated from the fixed contact 7 by moving the rear end side up and down to form a front electric circuit and a rear electric circuit. The movable contact member 10 and the like for electrically connecting / disconnecting the above are provided.

Further, for each electric circuit, a cutoff mechanism unit 9 for operating the movable contact member 10 and an operation unit 24 for operating the cutoff mechanism unit 9 are provided. Further, an electromagnetic trip device 11 that operates when an excessive current such as a short-circuit current flows through the electric circuit on the front side is installed. Then, in the circuit breaker 1, when an excessive current exceeding a predetermined value flows in the electric circuit, the electromagnetic trip device 11 operates to operate the operation unit 24, and the circuit breaker unit 9 receives the operation of the operation unit 24. Operates, the movable contact member 10 operates in the direction in which the movable contact 8 is separated from the fixed contact 7, and finally the electric circuit is cut off. Reference numeral 31 denotes a handle for turning on / off the electric circuit by operating the movable contact member 10 via the cutoff mechanism portion 9.

Here, the electromagnetic trip device 11 which is a main part of the present invention will be described in detail.
The electromagnetic trip device 11 includes a joint iron 21 that functions as a fixed electromagnetic piece, a movable electromagnetic piece 22 that is assembled to the joint iron 21, a compression spring 23 that is interposed between the joint iron 21 and the movable electromagnetic piece 22, and an excessive amount. It is provided with a coil portion 55 or the like that generates an electromagnetic force for attracting the movable electromagnetic piece 22 when an electric current flows. The joint iron 21 has a plate-shaped main body 25 extending in the vertical direction and a connecting portion 26 which is bent from the lower end of the main body 25 to the front side and into which the iron core 56 of the coil portion 55 can be inserted. An opening 27 is provided in the upper part of the main body 25, and a portion of the upper edge of the opening 27 that is substantially centered in the left-right direction protrudes downward (inside the opening 27 and on the side of the movable electromagnetic piece 22 described later). A first fitting projection 28 is provided. Then, the joint iron 21 is fixed to the base 2 in a state where the thickness direction of the main body 25 is the front-rear direction. Reference numeral 30 denotes a fixing piece for fixing the joint iron 21 to the base 2, and is provided on both left and right edges of the lower portion of the main body 25, respectively.

On the other hand, the movable electromagnetic piece 22 is a metal piece integrally having an adsorbed portion 22a extending forward and an acting portion 22b extending downward from the base end portion of the adsorbed portion 22a, and the acting portion 22b is connected to the iron. In a state where the portion 22a to be adsorbed is projected forward from the main body 25 of the joint iron 21 through the opening 27 and is located on the rear side of the 21. It is assembled. Further, at the base end portion (connecting side with the adsorbed portion 22a) of the working portion 22b, at a position facing the first fitting protrusion 28 at the time of assembling to the joint iron 21, the upper side (first fitting protrusion 28 side). ) Is provided with a second fitting protrusion 29. Further, the compression spring 23 formed in the shape of a coil spring has the joint iron 21 and the movable electromagnetic piece 22 in a state where the first fitting projection 28 is fitted on one end side and the second fitting projection 29 is fitted on the other end side. The movable electromagnetic piece 22 is urged to the normal posture side (the side that separates the suctioned portion 22a from the iron core 56) by a load in the extending direction.

Then, in the electromagnetic trip device 11, when a current exceeding a predetermined value flows through the electric circuit, the movable electromagnetic piece 22 changes its posture from the normal posture to the cutoff posture against the urging force of the compression spring 23 (specifically). Is in a forward leaning posture in which the piece to be adsorbed 22a is adsorbed on the iron core 56). Along with this change in posture, the action unit 22b interferes with the operation unit 24 to operate, and the shutoff mechanism unit 9 and eventually the movable contact member 10 operate with the operation of the operation unit 24 to shut off the electric path. become.

According to the electromagnetic tripping device 11 configured as described above, the movable electromagnetic piece 22 is assembled to the joint iron 21 in a state of penetrating the opening 27 provided in the joint iron 21 in the front-rear direction. The upper edge of the opening 27 of the joint iron 21 is provided with a first fitting protrusion 28 that protrudes downward, while the movable electromagnetic piece 22 projects upward at a position facing the first fitting protrusion 28. A second fitting protrusion 29 is provided. Then, as a urging means for urging the movable electromagnetic piece 22 toward the normal posture side, a compression spring 23 formed in a coil spring shape is provided, a first fitting projection 28 is provided on one end side, and a second fitting projection 28 is provided on the other end side. The 29s were provided in a state of being fitted in each. Therefore, a conventional electromagnetic trip device that employs a tension spring as a urging means for urging the movable electromagnetic piece toward the normal posture side and hooks both ends of the tension spring to the fixed electromagnetic piece or the movable electromagnetic piece, respectively. As compared with the above, it is possible to easily install the urging means and, by extension, assemble the electromagnetic trip device 11.

The configuration of the circuit breaker of the present invention according to the electromagnetic trip device is not limited to that of the above embodiment, and the overall structure of the electromagnetic trip device, as well as the installation of urging means, etc. The configuration according to the above can also be appropriately changed as necessary without departing from the spirit of the present invention.

For example, in the above embodiment, the first fitting projection is projected downward and the second fitting projection is projected upward, respectively, but the movable electromagnetic piece is attached in a state of penetrating the movable electromagnetic piece above the opening of the fixed electromagnetic piece. In the case of a thing, the first fitting protrusion may be projected upward and the second fitting protrusion may be projected downward, respectively, and the specific protruding directions of the first fitting protrusion and the second fitting protrusion may be described. The design can be changed as appropriate.
Further, in the above embodiment, the mounting posture of the compression spring is substantially parallel to the vertical direction, and the urging force of the compression spring acts in the substantially vertical direction. However, the first fitting protrusion and the first The mounting posture of the compression spring can be appropriately changed in relation to the specific protrusion direction of the fitting protrusion of 2, for example, by inclining the first fitting protrusion and the second fitting protrusion in the front-rear direction, respectively. It is also possible to configure the mounting posture of the compression spring to incline back and forth from the vertical direction so that the urging force of the compression spring acts in the inclining direction.

1 ... Circuit breaker, 2 ... Base (main body case), 9 ... Breaking mechanism, 11 ... Electromagnetic trip device, 21 ... Joint iron (fixed electromagnetic piece), 22 ... Movable electromagnetic piece, 22a ... Adsorbed part, 22b ... Acting part, 23 ... Compression spring, 24 ... Operating part, 25 ... Main body, 27 ... Opening, 28 ... First fitting protrusion, 29 ... Second Fitting protrusion, 55 ... coil part, 56 ... iron core.

Claims (1)

A fixed electromagnetic piece fixed to the main body case of the circuit breaker, a movable electromagnetic piece assembled to the fixed electromagnetic piece and capable of changing the posture between a normal posture and a breaking posture, and the fixed electromagnetic piece and the movable It is provided with an urging means interposed between the electromagnetic piece and urging the movable electromagnetic piece toward the normal posture side.
When a current exceeding a predetermined value flows through the electric circuit installed in the electric circuit arranged in the main body case, the movable electromagnetic piece shuts off from the normal posture against the urging force of the urging means. It is an electromagnetic trip device for a circuit breaker that changes its posture to a posture.
The movable electromagnetic piece is assembled to the fixed electromagnetic piece in a state of penetrating the opening provided in the fixed electromagnetic piece.
The opening edge of the fixed electromagnetic piece is provided with a first fitting projection protruding toward the movable electromagnetic piece, while the first fitting projection of the movable electromagnetic piece faces the first fitting projection. A second fitting protrusion that protrudes toward the protrusion is provided.
The compression spring formed in the shape of a coil spring is provided as the urging means with the first fitting protrusion fitted on one end side and the second fitting protrusion on the other end side. Electromagnetic trip device for circuit breakers.

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