JP2009087691A - Circuit breaker electromagnetic device - Google Patents

Abstract

Provided is an electromagnetic device for a circuit breaker that can reduce a mounting space, improve assembly workability, reduce costs, and does not require time and effort to adjust an overcurrent tripping element.
A bent portion 6b is formed on two opposite sides of a flat plate portion 6a so as to simultaneously surround two conductors 5 and 5 constituting a part of a main circuit between a power supply side terminal 3 and a load side terminal 4. The fixed electromagnetic piece 6 is formed in a substantially U-shape by bending, and one end of the movable electromagnetic piece 7 is pivotally supported on the bent portion 6b of the fixed electromagnetic piece 6 so that the movable electromagnetic piece 7 is fixed. The electromagnetic device 2 is configured by being biased by the elastic member 8 so as to be separated from the electromagnetic piece 6.
[Selection] Figure 2

Description

  The present invention relates to an electromagnetic device for a circuit breaker that operates when an excessive current flows in a main circuit due to a short circuit or the like and interrupts the main circuit.

  The electromagnetic device of the circuit breaker is a part of the main circuit between the power supply side terminal and the load side terminal. The fixed electromagnetic piece is formed in a substantially U shape by bending the bent portions on the two opposite sides of the flat plate portion. Is attached so as to surround a conductor constituting the fixed electromagnetic piece, and one end of the movable electromagnetic piece is pivotally supported at the bent portion of the fixed electromagnetic piece so that the movable electromagnetic piece is separated from the fixed electromagnetic piece by an elastic member. Has been. When an excessive current flows in the main circuit, the fixed electromagnetic piece is magnetized by the excessive current, the movable electromagnetic piece is attracted to the fixed electromagnetic piece against the urging force of the elastic member, and the tip of the movable electromagnetic piece is a tripping member , And the tripping member operates the switching mechanism to open the switching contact, thereby interrupting the main circuit. The electromagnetic device is provided on each of the voltage electrode and the neutral electrode, or is provided only on the voltage electrode (see, for example, Patent Document 1 and Patent Document 2).

Japanese Patent Laying-Open No. 2007-87824 (FIG. 1) Japanese Patent Laying-Open No. 2005-108605 (FIG. 1)

  When the electromagnetic devices are provided on the respective poles, there is a disadvantage that an installation space is required, which takes time for assembly and increases the cost. In addition, when the electromagnetic device is provided on only one pole, the overcurrent tripping element is provided so that the pole not provided with the electromagnetic device is cut off earlier than the pole provided with the electromagnetic device in order to satisfy the standard short-circuit performance. There was a problem that this adjustment was severe and time-consuming.

  According to the first aspect of the present invention, the two flat plate portions are opposed to each other so as to surround a conductor constituting a part of the main circuit between the power supply side terminal and the load side terminal of the circuit breaker. A fixed electromagnetic piece formed by bending the bent portion into a substantially U-shape, a movable electromagnetic piece that is pivotally supported at one end by the bent portion of the fixed electromagnetic piece, and a movable electromagnetic piece In an electromagnetic device of a circuit breaker composed of an elastic member that urges away from the fixed electromagnetic piece, the fixed electromagnetic piece is formed so as to accommodate two conductors arranged in parallel between the bent portions. Features.

  According to invention of Claim 2, in the electromagnetic device of the circuit breaker of Claim 1, the electric current which flows into the part accommodated in the bending part of the said fixed electromagnetic piece of a 2 pole conductor is the same direction It was made to become.

  According to the first aspect of the present invention, two magnetic poles can be tripped by one electromagnetic device, the mounting space can be reduced, and only one electromagnetic device is required, so that the assembly workability is improved. Because the number of parts is reduced, the cost is reduced, and both poles are electromagnetically tripped by one electromagnetic device, so there is no need to severely adjust the overcurrent tripping element, and the adjustment takes less time. There is.

  According to the second aspect of the invention, the magnetic field due to the current flowing through the bipolar conductors is combined to increase the magnetic force, so that the tripping time is increased.

  The electromagnetic part is fixed in a substantially U shape by bending the bent parts on the two opposite sides of the flat plate part so as to simultaneously enclose the two-pole conductors constituting part of the main circuit between the power supply side terminal and the load side terminal. An electromagnetic device is formed by forming a piece, and by providing one end of the movable electromagnetic piece pivotally supported at the bent portion of the fixed electromagnetic piece so that the movable electromagnetic piece is separated from the fixed electromagnetic piece. Configure.

  A first embodiment of an electromagnetic device for a circuit breaker according to the present invention will be described with reference to the attached drawings of FIGS.

  The electromagnetic device 2 provided in the circuit breaker 1 includes a fixed electromagnetic piece 6 disposed so as to surround a conductor 5 constituting a part of a main circuit between the power supply side terminal 3 and the load side terminal 4, and the fixed electromagnetic piece 6 The movable electromagnetic piece 7 is provided so as to be able to come into contact with and separate from the movable electromagnetic piece 7 and the elastic member 8 urges the movable electromagnetic piece 7 away from the fixed electromagnetic piece 6 during normal operation.

  The fixed electromagnetic piece 6 is formed in a substantially U shape by bending a bent portion 6b on two opposite sides of the flat plate portion 6a, and the outer peripheral surface is insulated and protected between the bent portions 6b and 6b. 5 and 5 are accommodated side by side.

  One end of the movable electromagnetic piece 7 is pivotally supported by the bent portion 6 b of the fixed electromagnetic piece 6, and the other end of the movable electromagnetic piece 7 contacts and separates from the edge of the bent portion 6 b of the fixed electromagnetic piece 6. Is provided.

  A coil spring is used as the elastic member 8, one end of the coil spring is locked to the other end of the movable electromagnetic piece 7, and the other end is locked to the case 9 of the circuit breaker 1.

  In the electromagnetic device 2 formed in this way, when an excessive current flows through the conductor 5, the fixed electromagnetic piece 6 is magnetized, and the movable electromagnetic piece 7 is attracted to the fixed electromagnetic piece 6 against the urging force of the elastic member 8. The As a result, the tip of the movable electromagnetic piece 7 operates the tripping member 10, and the tripping member 10 operates the opening / closing mechanism unit 11 to open the switching contact 12, thereby interrupting the main circuit.

  A second embodiment of the electromagnetic device for a circuit breaker according to the present invention will be described with reference to the attached drawings of FIGS.

  The electromagnetic device 22 provided in the circuit breaker 21 includes a fixed electromagnetic piece 26 disposed so as to surround a conductor 25 constituting a part of a main circuit between the power supply side terminal 23 and the load side terminal 24, and the fixed electromagnetic piece 26. The movable electromagnetic piece 27 is provided so as to be able to come into contact with and separate from the movable electromagnetic piece 27, and an elastic member 28 that urges the movable electromagnetic piece 27 away from the fixed electromagnetic piece 26 in a normal state.

  The fixed electromagnetic piece 26 is formed in a substantially U shape by bending a bent portion 26b on two opposite sides of the flat plate portion 26a, and the outer peripheral surface is insulated and protected between the bent portions 26b and 26b. 25 and 25 are accommodated side by side. At this time, of the two-pole conductor 25, the conductor 25 of one pole passes through the outside of the flat plate portion 26a of the fixed electromagnetic piece 26 and then passes through the inside of the flat plate portion 26a to surround the flat plate portion 26a. Is provided so as to make one round, so that the current flowing in the portion accommodated between the bent portions 26b of the conductor 25 is in the same direction.

  One end of the movable electromagnetic piece 27 is pivotally supported by the bent portion 26 b of the fixed electromagnetic piece 26, and the other end of the movable electromagnetic piece 27 contacts and separates from the edge of the bent portion 26 b of the fixed electromagnetic piece 26. Is provided.

  A coil spring is used for the elastic member 28, one end of the coil spring is locked to the other end of the movable electromagnetic piece 27, and the other end is locked to the case 29 of the circuit breaker 21.

  In the electromagnetic device 22 formed in this way, when an excessive current flows through the conductor 25, the fixed electromagnetic piece 26 is magnetized, and the movable electromagnetic piece 27 is attracted to the fixed electromagnetic piece 26 against the urging force of the elastic member 28. The As a result, the tip of the movable electromagnetic piece 27 operates the tripping member 30, and the tripping member 30 operates the opening / closing mechanism 31 to open the switching contact 32, thereby interrupting the main circuit.

  By making the current flowing in the portion accommodated between the bent portions 26b of the conductor 25 in the same direction, the magnetic field is generated in the same direction as shown by the arrows in FIG. 4, and the two magnetic fields are combined to generate a strong magnetic force. Therefore, the time for the movable electromagnetic piece 27 to be attracted to the fixed electromagnetic piece 26 is shortened, and the trip time is quick.

It is a side view showing the internal structure of the circuit breaker concerning Example 1 of the present invention. It is a top view which shows the electromagnetic device of the circuit breaker which concerns on Example 1 of this invention. It is a side view showing the internal structure of the circuit breaker which concerns on Example 2 of this invention. It is a top view which shows the electromagnetic device of the circuit breaker which concerns on Example 2 of this invention. It is a side view which shows the electromagnetic device of the circuit breaker which concerns on Example 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circuit breaker 2 Electromagnetic device 3 Power supply side terminal 4 Load side terminal 5 Conductor 6 Fixed electromagnetic piece 6a Flat plate part 6b Bending part 7 Movable electromagnetic piece 7a Shaft 8 Elastic member 9 Case 10 Tripping member 11 Opening and closing mechanism part 12 Opening and closing contact

Claims (2)

  The bent portions were bent at two opposite sides of the flat plate portion so as to surround a conductor constituting a part of the main circuit between the power supply side terminal and the load side terminal of the circuit breaker, and formed into a substantially U shape. A fixed electromagnetic piece, a movable electromagnetic piece that is pivotally supported at one end by a bent portion of the fixed electromagnetic piece, and an elastic force that urges the movable electromagnetic piece away from the fixed electromagnetic piece An electromagnetic device for a circuit breaker comprising a member, wherein the fixed electromagnetic piece is formed so as to accommodate two conductors arranged in parallel between the bent portions.   2. The circuit breaker electromagnetic device according to claim 1, wherein currents flowing in a portion of the two-pole conductor accommodated in a bent portion of the fixed electromagnetic piece are in the same direction. 3.

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