JP5334179B2 - Circuit breaker - Google Patents

Description

  The present invention relates to a circuit breaker in which a bimetal is connected to a movable contact via a flexible copper wire from a power supply side terminal through a fixed contact and a movable contact, and is conducted from a load seat to a load side terminal.

The overcurrent adjustment of the circuit breaker is performed by adjusting the position of the load seat built in the circuit breaker by tightening the adjustment screw inserted in the adjustment hole provided on the short side of the circuit breaker. This is done by moving to a position. Conventionally, this overcurrent adjustment has been performed with the circuit breaker energized. When an overcurrent is actually applied, the bimetal is displaced by heat, and when a specified current is passed, the adjustment screw is tightened and adjusted so that the circuit is shut off at a specified time. Once adjusted, check again with overcurrent for testing. If the specified value is not met at this time, adjust it again.

JP 2008-34313 A

  Since the adjustment is actually applied with an overcurrent, once the bimetal is displaced, it is necessary to cool the bimetal in order to perform testing or readjustment. In addition, a standing time of 1 to 2 hours is required.

  Adjustment in the energized state is dangerous, and the bimetal has to be cooled one by one at the time of readjustment and testing, which is very inefficient.

Therefore, the present invention has an object to provide a circuit breaker that can perform overcurrent adjustment without energization, and its structure is such that when an overcurrent flows by utilizing the displaceability due to the temperature of the bimetal, the bimetal is a movable contact. It has a mechanism that shuts off the circuit by hitting the engaging piece acting on the handle that operates the overcurrent adjustment that adjusts the displacement speed of the bimetal and the distance between the bimetal and the engaging piece, and how much the bimetal is displaced at what temperature Attach an adjustment member that determines the proper bimetal position from the data on whether there is any, and change the position of the load seat with the adjustment screw inserted in the adjustment hole provided on the short side of the circuit breaker It is allowed, especially that to allow adjusting the distance between the bimetal and the lock plate, provided with insertion holes for mounting the adjustment member to the circuit breaker in the longitudinal plane of the circuit breaker To.

  The insertion hole is provided with a lid, and after the overcurrent adjustment is completed, the insertion hole is covered with the lid.

  Further, the adjustment member is formed in an arc shape and can be formed integrally with the lid body, and after the overcurrent adjustment, the lid body is inverted to cover the insertion hole.

The circuit breaker of the present invention has a mechanism for interrupting the circuit by hitting the engaging piece acting on the handle that operates the movable contact when an overcurrent flows using the displaceability due to the temperature of the bimetal, In the overcurrent adjustment that adjusts the displacement speed of the bimetal and the distance between the bimetal and the engagement piece, an adjustment member that determines the proper bimetal position from the data of what temperature and how much the bimetal is displaced is used as the tip of the engagement piece. The position of the load seat can be changed by an adjustment screw inserted in the adjustment hole provided on the short side of the circuit breaker, and the distance between the bimetal and the engagement piece can be adjusted. since the insertion hole for attachment to the inner disposed in the longitudinal plane of the circuit breaker, since it is not energized can do work safely, even in the case of reconditioning and testing, based on the bimetal displacement Work efficiency can be carried out as soon as there is no need to cool to return will be better. In addition, overcurrent adjustment is possible in a state where the circuit breaker is assembled so as to be operable, and it is possible to eliminate the trouble of opening the entire case each time as in the conventional case, and adjustment work is facilitated.

  In addition, the insertion hole is provided with a lid, and after the overcurrent adjustment is completed, the insertion hole is covered with the lid, so that overcurrent adjustment is possible with the circuit breaker assembled in an operable state. As described above, the trouble of opening the case is saved, and the adjustment work is facilitated.

  In addition, the adjustment member is formed in an arc shape and can be formed integrally with the lid, and after adjusting the overcurrent, the lid is inverted and the insertion hole is covered, so the number of parts can be reduced and the parts lost The risk of this is also reduced. Since the lid is simply rotated, workability is not impaired.

It is sectional drawing which shows the internal mechanism of a circuit breaker. It is explanatory drawing which shows the circuit breaker which concerns on this invention. It is explanatory drawing which shows operation | movement of the adjustment member attached to the circuit breaker in FIG. It is explanatory drawing which shows the state which removes the adjustment member and is testing. It is explanatory drawing which shows the state which provided the cover body in the circuit breaker in FIG. It is an enlarged view of the cover body in FIG. It is explanatory drawing which shows the circuit breaker which concerns on this invention. It is explanatory drawing which shows the state which locked the cover body of the circuit breaker shown in FIG.

The embodiment of the circuit breaker according to the present invention will be described with reference to the accompanying drawings of FIGS. 1-8.

  The present invention relates to a circuit breaker having a mechanism for breaking a circuit within a predetermined time when an overcurrent flows. As shown in FIG. 1, the circuit breaker 1 is provided with an operation handle 3 for operating the circuit on and off at the upper part of the case 2. A bimetal 8 is connected from the power supply side terminal 4 to the movable contact 6 via the flexible copper wire 7 through the fixed contact 5 and the movable contact 6, and is conducted from the load seat 9 to the load side terminal 10. Furthermore, a latching piece 11 that is operated by the displacement of the bimetal 8 is provided, and the latching piece 11 is connected to the operation handle unit 12. Therefore, when an overcurrent flows, the bimetal 8 is displaced by the transmitted heat. By touching the engaging piece 11, the operation handle unit 12 operates and the circuit is shut off.

  The bimetal 8 has a different displacement angle and displacement speed depending on its temperature. Since the generated temperature varies depending on the magnitude of the overcurrent, the displacement angle and the displacement speed of the bimetal 8 vary depending on the magnitude of the overcurrent. In order to make the performance of the circuit breaker 1 constant, the angle and speed at which the bimetal 8 is displaced when an overcurrent of a certain magnitude flows are defined. Overcurrent adjustment is performed in order to make the displacement angle and speed of the bimetal 8 constant.

  Overcurrent adjustment is performed by adjusting the position of the load seat 9 incorporated inside the case by tightening the adjustment screw 14 inserted through the adjustment hole 13 provided in the short surface 2a of the case 2. For example, when 100% current flows, the displacement of the bimetal 8 is small and the circuit is not interrupted. When a current of 125% flows, the bimetal 8 is displaced and hits the engaging piece 11 in one hour, and the circuit is cut off. Further, when a current of 200% flows, the bimetal 8 is displaced and hits the engaging piece within 40 seconds, and the circuit is cut off. Thus, when prescribed | regulated, the distance between the bimetal 8 and the engagement piece 11 is adjusted so that the bimetal 8 may displace and contact the engagement piece 11 within the time.

  Since the characteristics such as how much displacement the bimetal 8 is in a certain time are known in advance, the adjustment member 15 that can measure the distance between the bimetal 8 and the engagement piece 11 determined based on the data is engaged. Attach to the end of the piece 11. 2 to 4, the adjustment member 15 has a cylindrical shape, and the position of the load seat is adjusted by the adjustment screw 14 so that the bimetal 8 is disposed at a position separated from the engagement piece 11 by a radius of the adjustment member 15. As shown in FIG. 4, after removing the adjustment member 15, a current is passed as a test to check whether or not the operation as specified is actually performed.

  Conventionally, the arrangement position of the bimetal has been determined by actually displacing the bimetal in the energized state and shutting off the circuit. Therefore, once the bimetal is displaced, It had to be cooled until it returned to its original position, and much time was spent adjusting the overcurrent. In the present invention, since overcurrent adjustment is performed only during an operation test, it is characterized by good workability and efficient overcurrent adjustment.

  As shown in FIG. 2 to FIG. 4, the circuit breaker 1 according to claim 2 of the present invention is provided with insertion holes 16 on both sides of the case longitudinal surface 2 b for inserting an adjusting member into the case 2 of the circuit breaker 1. . After the assembly of the circuit breaker 1 is completed, overcurrent adjustment becomes possible. Conventionally, overcurrent adjustment is performed while observing the state of the bimetal 8 and the engaging piece 11 while the case 2 of the circuit breaker 1 is opened, and after the adjustment, the case 2 is closed and the assembly of the circuit breaker 1 is completed. It was. Although the circuit breaker 1 after overcurrent adjustment has finished may be out of adjustment during the operation of closing the case 2, in the present invention, the overcurrent adjustment is performed after the assembly of the circuit breaker 1 is completed. Can be adjusted reliably.

As shown in FIG. 5, the circuit breaker according to claim 2 of the present invention is provided with a lid 17 in the insertion hole 16 provided in the case 2 of the circuit breaker 1 according to claim 1 . After the assembly of the circuit breaker 1 is completed, overcurrent adjustment becomes possible. Conventionally, overcurrent adjustment is performed while observing the state of the bimetal 8 and the engaging piece 11 while the case 2 of the circuit breaker 1 is opened, and after the adjustment, the case 2 is closed and the assembly of the circuit breaker 1 is completed. It was. Although the circuit breaker 1 after overcurrent adjustment has finished may be out of adjustment during the operation of closing the case 2, in the present invention, the overcurrent adjustment is performed after the assembly of the circuit breaker 1 is completed. Can be adjusted reliably.

As shown in FIGS. 6 to 8 , the circuit breaker according to claim 3 of the present invention is formed integrally with a lid 17 that covers the insertion hole 16 of the case 2 with the adjustment member 15 having a substantially semicircular cross section. To do. By forming them integrally, it is not necessary to remove the adjusting member 15 after performing overcurrent adjustment, and the adjusting member 15 is a small part, but the risk of loss is reduced. Further, by forming the cover body 17 integrally, the adjustment member 15 has a substantially semicircular cross section and the insertion hole 16 is formed by the cover body 17 so that the bimetal 8 can operate normally with the cover body 17 closed. In the case of the lid, the lid body 17 is rotated halfway, and the overcurrent adjusting portion is disposed on the opposite side to the bimetal 8 of the engagement piece 11. When adjusting the overcurrent, the distance between the bimetal 8 and the engaging piece 11 is measured, and when the circuit breaker 1 is completed, it can be placed at a position that does not hinder the operation of the bimetal 8.

  Further, the lid 17 that covers the overcurrent adjusting portion and the peripheral portion of the insertion hole 16 into which the adjustment member 15 is inserted are provided with opposing marks 18, and the insertion direction of the lid 17 into the insertion hole 16, The fixing direction of the lid body 17 can be confirmed from the outside. For example, in FIG. 7, the mark 18 is aligned with the lid 17 inserted into the insertion hole 16. In FIG. 8, the mark 18 is aligned with the lid 17 fixed to the insertion hole 16.

DESCRIPTION OF SYMBOLS 1 Circuit breaker 2 Case 2a Short side 2b Long side 3 Operation handle 4 Power supply side terminal 5 Fixed contact 6 Movable contact 7 Flexible copper wire 8 Bimetal 9 Load seat 10 Load side terminal 11 Engagement piece 12 Operation handle unit 13 Adjustment hole 14 adjusting screw 15 adjusting member 16 insertion hole 17 lid

Claims (3)

A circuit breaker that is connected from a power supply side terminal to a load side terminal by connecting a bimetal to the movable contact through a flexible copper wire through a fixed contact and a movable contact. When an overcurrent flows using displacement due to temperature, the bimetal has a mechanism that interrupts the circuit by hitting a latching piece that acts on a handle that operates the movable contact, and the bimetal displacement speed and the bimetal In the overcurrent adjustment that adjusts the distance between the engagement piece and the engagement piece, an adjustment member that determines an appropriate bimetal position from the data indicating how much the bimetal is displaced at what temperature is attached to the front end of the engagement piece, The distance between the bimetal and the engagement piece can be adjusted by changing the position of the load seat with an adjustment screw inserted in the adjustment hole provided on the short side of the circuit breaker. And, circuit breaker, characterized in that the insertion holes for mounting the adjustment member to the circuit breaker in provided in the longitudinal plane of the circuit breaker. A said circuit breaker, said lid is provided on the insertion hole, said overcurrent adjusting after the end by the cover, the circuit breaker according to claim 1, characterized in that the lidding said insertion hole vessel. In the circuit breaker, the adjustment member is formed in an arc shape and can be formed integrally with the lid body, and after the overcurrent adjustment, the lid body is inverted to cover the insertion hole. The circuit breaker according to claim 2 .

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