JP2002170476A - Electromagnetic device of circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic device of a circuit breaker which can adjust tripping properties easily without dismounting the electromagnetic device from the breaker case. SOLUTION: A leaf spring 7 to press an electromagnetic coil 5 against a spacer 6 is laid between a fixed yoke 4a of an oil dashpot 4 and the top portion of an electromagnetic coil, and an adjusting screw 11 is screwed into a base plate 3a of a yoke 3, and further, by turning the adjusting screw with a driver 12 inserted through an opening part on the bottom surface of a breaker case 13, the top of the adjusting screw 11 pushes the spacer 6, then, the position of the electromagnetic coil 5 with respect to the oil dashpot is displaced, as a result, its tripping property is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for adjusting a tripping characteristic in an electromagnetic device of a circuit breaker.

[0002]

2. Description of the Related Art Conventionally, an electromagnetic device 42 provided inside a circuit breaker 41 as shown in FIGS.
a substrate 43 of an L-shaped yoke 43 composed of a
The oil dash pot 44 having a built-in member having an exciting function penetrates and is fixed by soldering or the like. An electromagnetic coil 45 is wound around the outer periphery of the oil dash pot 44, and the lower end of the electromagnetic coil 45 and the yoke are connected. 43 substrate 43a
And a plate-shaped spacer 46 is interposed between the oil dash pot 44 and the electromagnetic coil 45.
6 and fixed iron piece 44a at the upper end of oil dash pot 44
And is fixed. Side plate 43b of yoke 43
The horizontal position where the suction side 47a contacts the fixed iron piece 44a of the oil dash pot 44 and the fixed iron piece 4
A movable iron piece 47 that can be turned upside down from an inclined posture away from the main iron 4a is pivotally attached to the main circuit.
The inclined position is maintained by a spring 48 having one end attached to the position b. When an overcurrent occurs in the main circuit, the electromagnetic coil 4
5, the fixed iron piece 44a at the upper end of the oil dash pot 44 sucks the suction side 47a of the movable iron piece 47 to the horizontal posture side. At this time, the suction side 47a of the movable iron piece 47
Is attracted to the fixed iron piece 44a, the tripping side 47b of the movable iron piece 47 operates the trip bar 49 to trip the main circuit.

[0003]

When adjusting the tripping characteristic of the electromagnetic device 42, the method of changing the spacer 46 is to remove the soldering of the oil dash pot 44 and remove it from the yoke 43 as shown in FIG. In order to displace the relative position between the electromagnetic coil 45 and the oil dashpot 44, the fixed iron piece 44a of the oil dashpot 44 is displaced.
A spacer 46a having a small thickness penetrates between the lower end of the electromagnetic coil 45 and the upper end of the electromagnetic coil 45.
The spacer 46b having a small thickness penetrates through the third substrate 43a and must be reassembled again. Further, the method of changing the spring 48 to another one or replacing the movable iron piece 47 with a deformed shape requires manufacturing a plurality of types of springs 48 and the movable iron piece 47, which increases the manufacturing cost. However, there is a problem that inventory management becomes complicated. Also,
When the surroundings of the electromagnetic device 42 were covered with other components, the electromagnetic device 42 had to be once taken out of the circuit breaker case 50, and the adjustment operation could not be performed easily.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the conventional electromagnetic device for a circuit breaker, an object of the present invention is to adjust the tripping characteristics easily without removing the electromagnetic device from the circuit breaker case. Provided is an oil dash pot having an L-shaped yoke composed of a substrate and a side plate, and a member having an excitation function fixed to the yoke. Between the electromagnetic coil wound around the outer periphery of the oil dash pot and the horizontal posture where the suction side contacts the fixed iron piece at the upper end of the oil dash pot near the upper end of the side plate of the yoke, and the inclined posture separated from the fixed iron piece. And a movable iron piece whose tripping side operates a trip bar in a circuit breaker electromagnetic device, wherein a fixed iron piece of an oil dash pot and an upper end of an electromagnetic coil are provided. An elastic member that urges the electromagnetic coil downward is interposed, and a spacer for displacing the relative position between the electromagnetic coil and the oil dash pot is interposed between the lower end of the electromagnetic coil and the yoke substrate. An adjustment means for displacing from the bottom side of the electromagnetic device is provided.

An adjustment screw is screwed onto a substrate of the yoke, and the tip of the adjustment screw presses the spacer to displace the vertical position of the electromagnetic coil.

Further, side walls are provided downward at both ends of the flat plate portion of the spacer to form a substantially U-shaped cross section, and a plurality of grooves substantially parallel to the flat plate portion are formed in both side wall portions of the spacer. The board is fitted into the groove on both side walls so that the knob part protrudes downward from the board of the yoke, and the vertical position of the electromagnetic coil is displaced.

[0007]

According to the electromagnetic device of the circuit breaker according to the present invention, an L-shaped yoke composed of a substrate and a side plate and a member having an exciting function fixed to the yoke are incorporated. Oil dash pot, an electromagnetic coil wound around the outer periphery of the oil dash pot, and a horizontal attitude in which the suction side contacts the fixed iron piece at the upper end of the oil dash pot near the upper end of the yoke side plate, and a tilt away from the fixed iron piece. In an electromagnetic device of a circuit breaker, comprising a movable iron piece pivotally movable between a posture and a trip side to operate a trip bar on a tripping side, between a fixed iron piece of an oil dash pot and an upper end of an electromagnetic coil. An elastic member for urging the electromagnetic coil downward is interposed, and a spacer for displacing the relative position between the electromagnetic coil and the oil dash pot is interposed between the lower end of the electromagnetic coil and the yoke substrate. , By providing the adjusting means for displacing the spacer from the bottom side of the electromagnetic device, it is not necessary to take out the electromagnetic device from a circuit breaker case, it is possible to adjust easily the tripping characteristic.

According to the electromagnetic device of the circuit breaker of the present invention, the adjusting screw is screwed into the yoke substrate, and the spacer is pressed by the tip of the adjusting screw to displace the vertical position of the electromagnetic coil. Thereby, the tripping characteristics can be easily adjusted.

According to the electromagnetic device of the circuit breaker according to the third aspect, the side walls are provided downward at both ends of the flat plate portion of the spacer to form a substantially U-shaped cross section, and the flat plate portions are formed on both side wall portions of the spacer. A plurality of grooves substantially parallel to the above are formed, and the board is fitted into the grooves on both side walls so that the knob at the tip of the side wall part projects downward from the yoke board, thereby displacing the vertical position of the electromagnetic coil. Thereby, the tripping characteristics can be easily adjusted.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of an electromagnetic device for a circuit breaker according to the present invention will be described with reference to FIGS.

An electromagnetic device 2 provided inside the circuit breaker 1 is penetrated by an oil dash pot 4 having a built-in member having an exciting function in a substrate 3a of an L-shaped yoke 3 composed of a substrate 3a and a side plate 3b. And is fixed by soldering or the like.

Although not shown, the oil dash pot 4 includes a magnetic plunger, a coil spring for urging the plunger toward the bottom of the oil dash pot 4, and oil having a constant viscosity from the upper opening. Contained,
The opening is covered with a fixed iron piece 4a. An electromagnetic coil 5 is wound around the outer periphery of the oil dash pot 4.

The lower end of the electromagnetic coil 5 and the substrate 3a of the yoke 3
The plate-shaped spacer 6 is between the oil dash pot 4
The leaf spring 7 is interposed between the fixed iron piece 4a of the oil dash pot 4 and the upper end of the electromagnetic coil 5 and penetrates the oil dash pot 4, and the electromagnetic coil 5 is It is urged downward and pressed against the spacer 6. The electromagnetic coil 5 is held between the spacer 6 and the leaf spring 7.

In the vicinity of the upper end of the side plate of the yoke 3, the suction side 8a can move between a horizontal position in which the suction side 8a contacts the fixed iron piece 4a at the upper end of the oil dash pot 4 and an inclined position separated from the fixed iron piece 4a. An iron piece 8 is pivotally mounted.

In the state where no overcurrent is generated in the main circuit, the suction side 8a of the movable iron piece 8 is kept in an inclined position by a spring 9 having one end attached to the side plate 3b of the yoke 3. When an overcurrent occurs in the main circuit, a current flows through the electromagnetic coil 5,
The fixed iron piece 4a at the upper end of the oil dash pot 4 sucks the suction side 8a of the movable iron piece 8 to the horizontal posture side. At this time,
When the suction side 8a of the movable iron piece 8 is sucked by the fixed iron piece 4a, the tripping side 8b of the movable iron piece 8 operates the trip bar 10 to trip the main circuit.

An adjustment screw 11 is screwed into the substrate 3a of the yoke 3. The tip of the adjusting screw 11 presses the spacer 6, and the vertical position of the spacer 6 can be adjusted by rotating the adjusting screw 11 with a driver 12 or the like, and the position of the electromagnetic coil 5 is displaced by the movement of the spacer 6. Can be done. By displacing the relative position between the electromagnetic coil 5 and the oil dash pot 4, the tripping characteristics can be changed.

The electromagnetic device 2 is provided such that the bottom surface of the circuit breaker case 13 and the substrate 3a of the yoke 3 are parallel to each other, and the driver 12 is inserted through the opening 14 in the bottom surface of the circuit breaker case 13 to adjust the adjustment screw 11 Can be adjusted, so that it is not necessary to take out the electromagnetic device 2 from the circuit breaker case 13, and the tripping characteristics of the electromagnetic device 2 can be easily adjusted. After the adjustment of the electromagnetic device 2, the opening 14 is sealed with a lid 15, a seal, or the like.

In this embodiment, a leaf spring is used as an elastic member for pressing the electromagnetic coil downward. However, the present invention is not limited to this, and can be changed as appropriate.

Second Embodiment of the Electromagnetic Device for a Circuit Breaker According to the Present Invention
An embodiment will be described with reference to the accompanying drawings of FIGS.

An oil dash pot 24 having a built-in member having an exciting function penetrates an electromagnetic device 22 provided inside the circuit breaker 21 through a substrate 23a of an L-shaped yoke 23 composed of a substrate 23a and a side plate 23b. And is fixed by soldering or the like.

The oil dash pot 24 includes a magnetic plunger (not shown), a coil spring for urging the plunger toward the bottom of the oil dash pot 24, and oil having a constant viscosity from an upper opening. It is accommodated and the opening is covered with a fixed iron piece 24a.
An electromagnetic coil 2 is provided on the outer periphery of the oil dash pot 24.
5 is wound.

A flat plate portion of a spacer 26 is interposed between the lower end of the electromagnetic coil 25 and the substrate 23a of the yoke 23 through the oil dash pot 24. Spacer 26
Side walls 26b are provided downward at both ends of the flat plate 26a, are formed in a substantially U-shaped cross section, and a plurality of grooves 26c substantially parallel to the flat plate 26a are formed on respective inner surfaces of the side walls 26b.
A knob 26d is formed at the tip of the side wall 26a. The spacer 26 opens the knobs 26d on both sides in the outward direction to connect the substrate 23a of the yoke 23 to the groove 26 of the side wall 26a.
c.

Fixed iron piece 24 of oil dash pot 24
a and a top end of the electromagnetic coil 25, a leaf spring 27 is interposed through the oil dash pot 24, and
7, the electromagnetic coil 25 is urged downward and pressed against the flat plate portion 26a of the spacer 26. The electromagnetic coil 25 is held between the spacer 26 and the leaf spring 27.

In the vicinity of the upper end of the side plate 23a of the yoke 23, the suction side 28a can be turned between a horizontal position in which it contacts the fixed iron piece 24a at the upper end of the oil dash pot 24 and an inclined position separated from the fixed iron piece 24a. The movable iron piece 28 is pivotally mounted.

In the state where no overcurrent is generated in the main circuit, the suction side 28a of the movable iron piece 28 is kept in an inclined position by a spring 29 having one end attached to a side plate 23b of the yoke 23. When an overcurrent occurs in the main circuit, a current flows through the electromagnetic coil 25, and the fixed iron piece 24a at the upper end of the oil dash pot 24 sucks the suction side 28a of the movable iron piece 28 to the horizontal posture side. At this time, when the suction side 28a of the movable iron piece 28 is attracted to the fixed iron piece 24a, the tripping side 28b of the movable iron piece 28 operates the trip bar 30 to trip the main circuit.

When adjusting the tripping characteristic of the electromagnetic device 22, the knob 26 d of the spacer 26 is opened outward from the opening 32 formed on the bottom surface of the circuit breaker case 31 with a finger or tweezers, and the yoke 23 is adjusted. Groove 2 into which substrate 23a fits
Change the position of 6c. Since the vertical position of the spacer 26 is changed, the position of the electromagnetic coil 25 is displaced,
By displacing the relative position between the oil dash pot 5 and the oil dash pot 24, the tripping characteristics can be changed.
After the adjustment of the electromagnetic device 22, the opening 32 is sealed with a lid 33 or a seal.

Although the groove of the spacer is formed on the inner surface of the side wall in this embodiment, as shown in FIG.
The groove 26c is formed on the outer surface of the side wall 26b so that the upper and lower positions of the spacer 26 can be adjusted by sandwiching both the knobs 26d of the b with fingers.
And the shape of the electromagnetic device 22 can be appropriately changed without departing from the spirit of the present invention, such as by deforming the substrate 23a of the yoke 23 accordingly.

In this embodiment, a leaf spring is used as an elastic member for pressing the electromagnetic coil downward. However, the present invention is not limited to this, and can be changed as appropriate.

[0029]

As described above, the electromagnetic device of the circuit breaker according to the present invention is an oil device having an L-shaped yoke composed of a substrate and a side plate, and a member having an exciting function fixed to the yoke. The dash pot, the electromagnetic coil wound around the outer periphery of the oil dash pot, and the horizontal posture in which the suction side contacts the fixed iron piece at the upper end of the oil dash pot near the upper end of the side plate of the yoke, and the inclined posture separated from the fixed iron piece And a movable iron piece whose tripping side operates a trip bar on the tripping side between the fixed iron piece of the oil dash pot and the upper end of the electromagnetic coil. An elastic member for urging the coil downward is interposed, and a spacer for displacing the relative position between the electromagnetic coil and the oil dash pot is interposed between the lower end of the electromagnetic coil and the yoke substrate, By providing the adjusting means for displacing the pacer from the bottom side of the electromagnetic device, there is no need to take out the electromagnetic device from the circuit breaker case, which has an excellent effect that the tripping characteristics can be easily adjusted. .

[0030] Further, it is possible to easily adjust the tripping characteristics by screwing an adjusting screw to the yoke substrate and displacing the vertical position of the electromagnetic coil by pressing the spacer with the tip of the adjusting screw. effective.

Further, side walls are provided downward at both ends of the flat plate portion of the spacer to form a substantially U-shaped cross section, and a plurality of grooves substantially parallel to the flat plate portion are formed in both side wall portions of the spacer. By fitting the board into the grooves on both side walls so that the knob part protrudes downward from the yoke board and displacing the vertical position of the electromagnetic coil, the tripping characteristics can be easily adjusted. effective.

[Brief description of the drawings]

FIG. 1 is a front view showing an electromagnetic device of a circuit breaker according to a first embodiment of the present invention.

FIG. 2 is a front view showing a state in which the electromagnetic device of the circuit breaker according to the first embodiment of the present invention is incorporated in a circuit breaker case.

FIG. 3 is a front view showing an electromagnetic device of a circuit breaker according to a second embodiment of the present invention.

FIG. 4 is a front view showing a state in which the electromagnetic device of the circuit breaker according to the second embodiment of the present invention is incorporated in a circuit breaker case.

FIG. 5 is a front view showing a modified example of the electromagnetic device of the circuit breaker according to the second embodiment of the present invention.

FIG. 6 is a front view showing an electromagnetic device of a conventional circuit breaker.

FIG. 7 is a front view showing a state where an electromagnetic device of a conventional circuit breaker is incorporated in a breaker case.

FIG. 8 is a front view showing a state where a spacer of an electromagnetic device of a conventional circuit breaker is changed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circuit breaker 2 Electromagnetic device 3 Yoke 3a Substrate 3b Side plate 4 Oil dash pot 4a Fixed iron piece 5 Electromagnetic coil 6 Spacer 7 Leaf spring 8 Movable iron piece 8a Suction side 8b Release side 9 Spring 10 Trip bar 11 Adjusting screw 12 Driver 13 Circuit breaker case 14 Opening 15 Lid

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[Procedure amendment]

[Submission date] December 1, 2000 (200.12.
1)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2

Claims (3)

[Claims] 1. An L-shaped yoke comprising a substrate and a side plate;
An oil dash pot containing a member having an excitation function fixed to the yoke, an electromagnetic coil wound around the outer periphery of the oil dash pot, and an oil dash pot having a suction side near an upper end of a side plate of the yoke. Device of a circuit breaker, comprising: a movable iron piece pivotally pivotable between a horizontal attitude in contact with a fixed iron piece at an upper end of the armature and an inclined attitude away from the fixed iron piece, and a tripping side operating a trip bar on a tripping side. An elastic member for urging the electromagnetic coil downward is interposed between the fixed iron piece of the oil dash pot and the upper end of the electromagnetic coil, and between the lower end of the electromagnetic coil and the substrate of the yoke. A spacer for displacing the relative position between the electromagnetic coil and the oil dash pot, and adjusting means for displacing the spacer from the bottom side of the electromagnetic device. Electromagnetic device of a circuit breaker, characterized in that the. 2. The method according to claim 1, wherein an adjusting screw is screwed onto the substrate of the yoke, and a tip of the adjusting screw presses the spacer to displace the vertical position of the electromagnetic coil. Electromagnetic device for circuit breakers. 3. A spacer having a substantially U-shaped cross section provided at both ends of a flat plate portion of the spacer, and a plurality of grooves substantially parallel to the flat plate portion are formed on both side walls of the spacer. 2. The vertical position of the electromagnetic coil is displaced by fitting the substrate into the grooves of the side wall portions so that a knob at the tip of the side wall portion projects downward from the yoke substrate. An electromagnetic device for a circuit breaker according to claim 1.