JP2005293871A - Trip driving device at time of overcurrent of breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a trip driving device of a breaker at the time of overcurrent capable of manufacturing a breaker at low cost and heightening response. <P>SOLUTION: A ridgeline 23c where an absorbing face 23a absorbing an absorbed part 22 of a driving piece 20 and a crossing face 23b crosses is formed at an electromagnet 19, and the driving piece 20 is made supported to the electromagnet 19 in free rotation by engaging a bent concave part 28 formed at a jointed part of the absorbed part 22 of the driving piece 20 and an engagement part 27 made by bending its top end edge, so that a pin for supporting the driving piece to the electromagnet in free rotation is done away with. Reduction of the number of parts and man-hour, simplification of shapes of the electromagnet 19, the driving piece 20 and a case, as well as weight saving and alleviation of abrasive resistance of the driving piece are aimed at, to obtain a breaker at extremely low cost and with high response. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In a circuit breaker that stops energizing the load circuit when an overcurrent occurs in the load circuit, the circuit breaks instantaneously from an on state where the load circuit is conducted to the power circuit during an overload to an off state where the load circuit is disconnected from the power circuit. In order to return to the state, the electromagnet excited by the current of the internal circuit formed between the power supply circuit and the load circuit, and the movable contact is locked at a position where it is magnetically attracted to the electromagnet and contacts the fixed contact. An overcurrent trip drive device is provided that includes a drive piece that releases the locking action of the link mechanism.

  Conventionally, as this overcurrent trip driving device 100, as shown in FIG. 6, an apparatus including an electromagnet 101 fixed to a breaker case and a driving piece 111 disposed to face the electromagnet 101 is used. ing.

  The drive piece 111 includes an attracted portion 112 that is electromagnetically attracted to the electromagnet 101, a drive portion 113 that is an extension of the attracted portion 112, and a pin portion 114. The pin portion 114 of the driving piece 111 is inserted and fixed in the pin hole 122 of the support frame 121 made of an elastic material. The support frame 121 to which the driving piece 111 is fixed is inserted into the pin hole 123 provided on the side surface of the support frame 121 with the pin 102 provided on the side surface of the electromagnet 101 and is rotatably supported by the electromagnet 101. The

  In addition, since the said prior art is not based on literature well-known invention, there is no prior art document information which should be described.

  In the conventional overcurrent trip driving device 100 described above, the support frame 121 has a function of supporting the driving piece 111 with respect to the electromagnet 101 at an appropriate interval. The positional relationship between the electromagnet 101 and the drive piece 111 is particularly important in order to stably attract the drive piece 111 to the electromagnet 101 by the magnetic force of the electromagnet 101 when a predetermined current flows through the internal circuit. The shape accuracy required for the frame 121 is very strict. Further, it is necessary to form the pin portions 102 and 114 in the electromagnet 101 and the driving piece 111.

  In addition, the processing for forming the pin portions 102 and 114 on the electromagnet 101 and the driving piece 111 has a problem that energy consumption is high because of a heavy load on a complicated and expensive mold and press.

  Further, the support frame 121 is likely to be deformed during the assembly operation of the overcurrent trip driving device 100, and there is a problem that a stable operation cannot be obtained when the support frame 121 is deformed.

  An object of the present invention is to solve these problems of the prior art and provide an overcurrent trip driving device capable of manufacturing a breaker at low cost and improving responsiveness.

  In order to achieve this object, the present invention provides a breaker overcurrent trip drive device having an electromagnet and a drive piece that is driven by the electromagnet to trip the breaker, wherein the drive piece is attracted to the electromagnet. And a drive part extended from a part of one end edge of the attracted part, and an engaging part in which one end edge part of the attracted part is partially bent, and the electromagnet includes the attracted part An adsorbing surface that adsorbs the adsorbing surface, an intersecting surface that intersects the adsorbing surface, and a ridge line that intersects the adsorbing surface and the intersecting surface. The above-mentioned driving piece is rotatably supported by the electromagnet by engaging the bent concave portion.

  Here, tripping means releasing the lock of the breaker opening / closing mechanism locked in the on state, and enabling the return to the off state.

  According to the present invention, since the drive piece is rotatably supported by the electromagnet by being engaged with the ridgeline of the electromagnet, the conventionally required pin is unnecessary. Therefore, it is not necessary to complicate the shape of the electromagnet or the case to support the pin, and the breaker can be made inexpensive by simplifying the shape of the electromagnet or the case and making the electromagnet or the case inexpensive. Since there are few, the assembly man-hour of a breaker can be reduced and a breaker can be made still cheaper.

  In addition, according to the present invention, since it is not necessary to provide a support portion for planting or inserting the pin, the amount of material used can be reduced, the press die of the drive piece can be made inexpensive, and press working Energy can be saved, and the manufacturing cost of the drive piece can be greatly reduced, which makes the breaker even more inexpensive.

  As described above, according to the present invention, the pin for rotatably supporting the drive piece with respect to the electromagnet is omitted, so that the number of parts and the number of assembly steps can be reduced and the breaker can be manufactured at low cost. In addition, the shape of the electromagnet and the case can be simplified, and an effect that the breaker can be manufactured at a lower cost can be obtained.

  Further, according to the present invention, since the support portion for supporting the drive piece on the electromagnet is omitted, the amount of material used can be reduced, and the cost of the press die and the energy consumption of the press can be reduced. The effect which can be obtained can be acquired, the above various effects can synergize, and the effect which can manufacture a breaker very much cheaply can be acquired.

  In addition, since the drive piece of the present invention is not affected by static friction generated between the pin and the pin hole, it is possible to obtain an effect of further improving the responsiveness.

  Hereinafter, an embodiment of the present invention will be specifically described with reference to the drawings. FIG. 1 is an exploded perspective view of an embodiment of the present invention, and FIG. 2 is a side view of a breaker provided with an embodiment of the present invention.

  FIG. 2 shows the breaker in an on state in which the load circuit is conducted to the power supply circuit. In FIG. 2, the front-rear direction is the front and back direction of the paper, and the upper, lower, left, and right directions are directions indicated by arrows in the figure.

  The breaker shown in FIG. 2 includes a power connection terminal 2 for connecting a power circuit to the right end portion of the case 1, and a load connection terminal 3 for connecting a load circuit to the left end portion. The fixed contact 5 made conductive through the support piece 4 and the movable contact 6 brought into and out of contact with the fixed contact 5 are provided.

  The fixed contact 5 is fixed to the case 1, and the movable contact 6 is provided so as to be movable up and down above the fixed contact 5 via a floating member 7.

  The opening / closing means 8 for bringing the movable contact 6 into and out of contact with the fixed contact 5 includes an urging means 9 for urging the movable contact 6 upward, that is, in a direction away from the fixed contact 5 via the floating member 7, A link mechanism 10 for bringing the movable terminal 6 into contact with the fixed contact 5 against the biasing means 9.

  The link mechanism 10 includes a handle 11 that is rotated by an operator, and a link 12 that is supported by the handle 11 at a position away from the axis of rotation of the handle 11 so that the proximal end portion of the handle 11 is rotatable about the front and rear axis. And an opening / closing member 14 supported by the case 1 so as to be rotatable about the first fulcrum shaft 13, and a trip member 15.

  The handle 11 is centered about the second fulcrum shaft 16 between an off position received by the off-time check portion 1a provided on the case 1 and a position received by the on-time check portion 1b provided on the case 1. And is urged to the off position by a return spring 17.

  The distal end portion of the link 12 is slidably contacted with the upper surface of the opening / closing member 14, and when the operator moves the handle 11 from the off position to the on position, the distal end portion of the link 12 moves to the opening / closing member 14 and the floating member. While the member 7 is pushed down to bring the movable contact 6 into contact with the fixed contact 5, the base end portion of the link 12 moves from the right side to the left side of the straight line connecting the second fulcrum shaft 16 and the tip end portion of the link 12, The link mechanism 10 is locked in the ON state by biasing the handle 11 to the ON position against the return spring 17 via the floating member 7 and the opening / closing member 14 by the biasing means 9.

  By the way, the breaker drives the trip member 15 when an overcurrent flows in the load circuit, and the trip member 15 cancels the action of restraining the tip end portion of the link 12 on the upper surface of the opening / closing member 14. A current trip drive unit 18 is provided.

  As shown in FIGS. 1 and 2, this overcurrent trip drive device 18 is driven by an electromagnet 19 through which an internal circuit portion connecting the power connection terminal 2 and the floating member 7 is inserted, and the electromagnet 19. And a drive piece 20 for driving the trip member 15 and a return spring 21 for separating the drive piece 20 from the trip member 15.

  In FIG. 1, front and rear, left and right, and top and bottom are indicated by arrows. As shown in FIG. 1, the electromagnet 19 includes an adsorption member 23 obtained by bending a ferromagnetic material such as iron or steel into a U-shaped groove, and the end surface of the groove side wall of the adsorption member 23 is a portion to be attracted of the drive piece 20. A suction surface 23a for sucking 22 is formed. Then, an insulating tube 25 made of, for example, a synthetic resin and a part of the internal circuit inserted through the insulating tube 25 are inserted into the groove 24 formed inside the adsorption member 23.

  The electromagnet 19 is excited by a current flowing through a part of the internal circuit, and attracts a suction surface 23a that attracts the attracted portion 22 of the drive piece 20, an intersecting surface 23b that intersects the attracting surface 23a, and the attracting surfaces 23a. And a ridge line 23c where the intersecting surface 23b intersects.

  The drive piece 20 is one-shot press-molded one plate material or band material, and the attracted portion 22 and a drive portion extended from a part of the upper edge of the attracted portion 22, for example, the second half portion. 26 and an engaging portion 27 formed by bending a part of the upper edge portion of the attracted portion 22, for example, the first half portion. Then, the driving piece 20 is engaged with the ridge line 23 c of the electromagnet 19 by engaging the bending recess 28 formed in the bending portion between the attracted portion 22 and the engaging portion 27 of the driving piece 20, so that the driving piece 20 is engaged with the electromagnet 19. The ridge line 23c is supported as a fulcrum so as to be rotatable around the longitudinal axis.

  When the current flowing through the internal circuit is below a predetermined value, the return spring 21 prevents the drive piece 20 from falling off the electromagnet 19 and the attracted portion 22 is attracted as shown in FIG. The lower end of the surface 23a is elastically supported at an off position where the lower end thereof is received by the driving piece check portion 1c provided in the case 1.

  FIG. 3 shows a case where the current value of the internal circuit exceeds a predetermined value, the electromagnet 19 attracts the attracted portion 22 of the drive piece 20, and the check of the link 12 by the trip member 15 is released (hereinafter referred to as a trip time). .) Is a side view of the breaker.

  As shown in FIG. 3, the trip member 15 includes a central portion 29 that is rotatably supported by the first fulcrum shaft 13, and a hook portion 30 that extends from the central portion 29 to the upper side of the opening / closing member 14. The overcurrent passive portion 31 is provided extending downward from the central portion 29.

  As shown in FIG. 1, in the on state, the movement of the distal end portion of the link 12 in the distal direction of the opening / closing member 14 is limited by a heel portion 32 formed at the distal end of the hook portion 30. The movement in the base end direction is limited by the upper surface of the opening / closing means 14.

  When an overcurrent or a sudden current fluctuation occurs in the load circuit in this ON state, the magnetic attractive force of the electromagnet 19 overcomes the biasing force of the return spring 21, and as shown in FIG. The adsorbing part 22 is adsorbed on the adsorbing surface 23a, the driving piece 20 rotates counterclockwise around the ridge line 23c, and the driving part 26 moves the passive part 32 when the trip member 15 is overcurrent to the left. Then, the tip portion 32 of the hook portion 30 is separated from the upper surface of the opening / closing member 14 to be larger than the thickness of the tip portion of the link 12.

  As a result, the restraint on the movement of the link 12 in the distal direction of the link 12 by the hook portion 30 is released, and the distal end portion of the link 12 slides in the distal direction of the opening / closing member 14 so that the opening / closing member 14, the floating member 7 and the movable contact point. 6 moves upward and the internal circuit is opened.

  On the other hand, when the distal end portion of the link 12 slips in the distal end direction of the opening / closing direction 14, the handle 11 loses its urging force by the urging means 9 and is rapidly returned to the off position by the return spring 16. As shown in the side view of FIG. 4, when the handle 11 returns to the off position, the tip of the link 12 is pulled back in the direction of the first fulcrum shaft 13.

  Further, when the internal circuit is opened, the magnetic attractive force of the electromagnet 19 disappears, and the drive piece 20 is returned to the off position by the return spring 21, and the drive piece 20 follows the return to the off position. The tripping member 15 returns to the position where the tip of the link 12 is restrained by its own weight, and the tip of the link 12 that has been pulled back to the first fulcrum shaft 13 side is the hook portion 30 between the tip 32 and the central portion 29. And the opening / closing member 14.

  FIG. 5 is a side view of the breaker in the off state. In the off state, the rise of the tip of the opening / closing member 14 biased by the biasing means 9 is restrained by the left restraining portion 1 d provided in the case 1. The rise of the floating member 7 that is urged upward by the urging means 9 is restrained by the left restraining part 1e between the movable contact 16 and the urging means 9 via the intermediate opening / closing member 14, and the above It is restrained by a right restraining portion 1d provided in the case 1 on the left side of the biasing means 9. The movable contact 6 supported by the floating member 7 is held at an off position spaced above the fixed contact 5.

  Switching from the off state to the on state is performed by the operator operating the handle 11, but the state of the trip drive device 18 during overcurrent does not change during this switching.

  As described above, since the drive piece 20 does not use a pin for allowing the electromagnet 19 to rotatably support the drive piece 20, a pin hole for inserting the pin into the electromagnet 19 is formed, It is not necessary to form a pin hole for inserting this pin in 1 or a pin itself. As a result, the number of parts and the number of assembling steps can be reduced to obtain an effect that the breaker can be manufactured at a very low cost. In addition, the shape of the electromagnet and the case can be simplified, and the effect that the breaker can be manufactured at a lower cost can be obtained.

  Further, since the drive piece 20 is not provided with a support portion through which the pin is implanted or inserted, the amount of material used can be reduced and the die cost and energy cost of the press can be reduced. The effect can synergize and the effect that a breaker can be manufactured at a very low cost can be obtained.

  Furthermore, according to this embodiment, since the drive piece 20 is not provided with a support portion through which the pin is implanted or inserted, the inertia weight of the drive piece 20 is reduced and the responsiveness is enhanced. An effect can be obtained.

  By the way, in the above embodiment, the return spring 21 for urging the drive piece 20 is provided. However, in the on state, the overcurrent passive portion 30 of the trip member 15 is applied to the drive piece 20 with a predetermined set pressure. Another biasing means for contact is provided, and when the electromagnetic attracting force of the electromagnet 19 exceeds a predetermined value, the drive piece 20 moves the passive portion 30 at the time of overcurrent to the left against the biasing means, and trips. The check of the link 12 by the member 15 may be released.

  In the above-described embodiment, the drive part 26 of the drive piece 20 is formed on a flat plate flush with the attracted part 22. For example, the drive part 20 is bent into a square shape when viewed from the side surface or bent into a crank shape. It can be formed into a bent shape such as a twisted plate shape.

  Furthermore, in the above-described embodiment, the included angle at the ridge line 23c between the attracting surface 23a and the intersecting surface of the electromagnet 19 is 90 °. This included angle drives the trip member 15 from the driving piece 20 from the off position. Then, it is set to be smaller than the angle between the bent recess 28 between the attracted portion 22 and the engaging portion 27 of the drive piece 20 so that the trip member 15 can move between positions where the restraint of the link 12 can be released. It suffices to have an obtuse angle or an acute angle.

It is an exploded perspective view of the present invention. It is a side view in the ON state of a breaker provided with this invention. It is a side view at the time of trip of a breaker provided with this invention. It is a side view at the time of return to an OFF state of a breaker provided with the present invention. It is a side view in the OFF state of a breaker provided with the present invention. It is a side view of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 18 Trip drive device at the time of overcurrent 19 Electromagnet 20 Drive piece 22 Adsorbed part 23a Adsorbed surface 23b Intersection surface 23c Ridge line 26 Drive part 27 Engagement part 28 Bending concave part

Claims (1)

In an overcurrent trip driving device for a breaker having an electromagnet and a driving piece driven by the electromagnet to trip the breaker,
The electromagnet includes an attracting surface that attracts the attracted portion, an intersecting surface that intersects the attracting surface, and a ridge line that intersects the attracting surface and the intersecting surface, and the drive piece is attracted to the electromagnet. And a drive part extended from a part of one end edge of the attracted part, and an engaging part obtained by partially bending the one end edge part of the attracted part, An overcurrent trip drive device for a breaker, wherein the drive piece is rotatably supported by an electromagnet by engaging a bent recess formed in a bent portion between an attracting portion and an engaging portion.

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