JP2009289704A - Structure of connection board of circuit breaker unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection board 8 of a circuit breaker unit 1 can reduce an action time lag by limiting an arrangement place and an arrangement angle of a bimetal 7 by a simple structure. <P>SOLUTION: In the circuit breaker unit 1, a load seat connecting part 17 to be connected to a screw-type terminal and a bimetal connecting part 18 to be connected to a bimetal 7 are formed, and in a space between the load seat connecting part 17 and the bimetal connecting part 18, there is provided a flexible wall 19 to enhance an accuracy of a product. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a structure of a connection plate for connecting a screw type terminal and a bimetal having a function of interrupting a circuit in the event of an overcurrent of a circuit breaker having a screw type terminal for connecting a conductor by screw tightening.

The screw type terminal and the bimetal of the conventional circuit breaker are juxtaposed in the case. As devices have become smaller and circuit breakers are required to save space, the terminals and bimetals were arranged close to each other. And the connection board which connects a terminal and a bimetal was extended toward the direct lower part from the side part of the terminal, and was connected to the bimetal in the lower part of the case. The bimetal is provided upward, and the engaging piece and the handle unit are arranged at a position corresponding to the operation of the bimetal.
JP 2001-84885 A

  In the screw type terminal, the conductor is connected to the terminal by rotating and tightening the screw. The terminal fitting is rotated by the operation of rotating the screw, and the bimetal may also rotate in conjunction with it. If the position of the bimetal is shifted, the distance between the bimetal and the engaging piece is changed, which may cause a shift in the operation time of the bimetal.

  Therefore, the present invention has an object to provide a circuit breaker connection plate structure that has a simple structure, limits the placement location and angle of bimetal, and reduces the shift in operating time. Forming a load seat connection portion connected to the type terminal and a bimetal connection portion connected to the bimetal, and providing a flexible wall between the load seat connection portion and the bimetal connection portion To do.

  The structure of the connection board of the circuit breaker according to the present invention forms a load seat connection portion connected to the screw terminal and a bimetal connection portion connected to the bimetal, and from the load seat connection portion to the bimetal connection portion. In order to provide a flexible wall in between, even if the terminal screw is tightened, the contact part of the connection plate hits both sides of the case and does not rotate to the bimetal, so it does not affect the operation time of the bimetal and is stable The circuit breaker of the quality which was made can be provided.

  The structure of the connection board of the circuit breaker according to the present invention will be described with reference to the accompanying drawings of FIGS.

  FIG. 1 shows the internal mechanism of the circuit breaker 1 in the on state. The circuit breaker 1 is provided with an operation handle 2 for turning the circuit breaker 1 on and off. A fixed contact 4 is connected to the power supply side terminal 3, and a movable contact 5 is disposed so as to face the fixed contact 4. The movable contact 5 is interlocked with the operation handle 2, and the circuit is operated or cut off by contacting or leaving the fixed contact 4. The current introduced from the power supply terminal 3 flows to the bimetal 7, the connection plate 8, and the load side terminal 9 through the flexible copper wire 6 and the like through the power supply side terminal 3, the fixed contact 4 and the movable contact 5. , Sent to load equipment.

  When an overcurrent flows in the circuit using the characteristic of displacement due to the temperature of the bimetal 7, the bimetal 7 is bent due to the temperature transmitted to the bimetal 7, and is provided at a position where it cannot be touched when the bimetal 7 is in a normal state. The hooking piece 10 is in contact. The engagement piece 10 is connected to the operation handle 2, and when the engagement piece 10 is operated by the bimetal 7, the operation handle 2 is also operated, and the circuit is pulled off to be turned off.

  In the present invention, both the power supply side terminal 3 and the load side terminal 9 are constituted by screw type terminals in which a conductor (not shown) is fixed by screwing. The load-side terminal 9 is constituted by a substantially box-shaped terminal fitting 12 having a conductor introduction port 11 formed therein. A screw insertion hole 13 is formed on the upper surface of the terminal fitting 12, and a conductor is fastened and fixed to the screw insertion hole 13. For this purpose, a terminal screw 14 is inserted. A load seat 15 is incorporated in the terminal fitting 12, and the conductor is sandwiched between the load seat 15 and the holding fitting 16 by tightening the terminal screw 14. The load side terminal 9 and the bimetal 7 are connected through a connection plate 8. One end of the connection plate 8 is connected to the side opposite to the conductor introduction port 11 of the terminal fitting 12, and the bimetal 7 is connected to the other end.

  The connection plate 8 is provided with a load seat connection portion 17 at one end and a bimetal connection portion 18 at the other end. From the load seat connection portion 17 to the bimetal connection portion 18, the connection plate 8 bends the flexible wall 19 in a crank shape when viewed from above.

  The circuit breaker 1 has a function of breaking the circuit when an overcurrent flows. As described above, the heat generated by the overcurrent displaces the bimetal 7 and the bimetal 7 is engaged with the engagement piece 10 so that the operation handle 2 operates and the circuit is interrupted. Depending on the positional relationship between the bimetal 7 and the engaging piece 10, the time required for overcurrent tripping varies. In order to maintain a certain accuracy, it is necessary to make the positional relationship between the bimetal 7 and the engaging piece 10 constant.

  However, when the terminal screw 14 is tightened and rotated to fix the conductor to the load side terminal 9, the terminal fitting 12 may also rotate simultaneously with the terminal screw 14. With the conventional connection plate structure, when the connection plate is bent, the bimetal is also distorted, and the bimetal arrangement position is shifted, so that the overcurrent tripping time may not be constant.

  In the structure of the connecting plate 8 in the present invention, the flexible wall 19 absorbs the distortion caused by the tightening of the terminal screw 14, so that the bimetal 7 is not distorted and an overcurrent flows through any circuit breaker. In such a case, the circuit breaker can be pulled out in a certain time and has a certain accuracy.

It is explanatory drawing which shows the mechanism of a circuit breaker. It is explanatory drawing which shows the terminal part structure of the load side terminal in a circuit breaker. It is a top view which shows the structure of the connection board of the circuit breaker in FIG. It is a side view which shows the structure of the connection board of the circuit breaker in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circuit breaker 2 Operation handle 3 Power supply side terminal 4 Fixed contact 5 Movable contact 6 Flexible copper wire 7 Bimetal 8 Connection board 9 Load side terminal 10 Engagement piece 11 Conductor introduction port 12 Terminal metal fitting 13 Screw insertion hole 14 Terminal screw 15 Load Seat 16 Presser Bracket 17 Load Seat Connection 18 Bimetal Connection 19 Flexible Wall

Claims (1)

  A circuit breaker having a screw type terminal for connecting a conductor by screw tightening, and a structure of a connection plate for connecting the screw type terminal to a bimetal having a function of interrupting a circuit in the event of an overcurrent. A load seat connection portion to be connected and a bimetal connection portion to be connected to the bimetal are formed, and a flexible wall is provided between the load seat connection portion and the bimetal connection portion. The structure of the connecting plate.

Images