JPH017965Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to an operation display device for an earth leakage circuit breaker with overload, which is used to open and close electrical circuits, and which detects overload leakage of the load and prevents electrical circuit accidents. It is.

Purpose This invention is an overload earth leakage breaker in which the opening/closing mechanism of each pole and the earth leakage detection part are housed in an independent case cover. The object of the present invention is to provide an operation display device for an earth leakage circuit breaker with an overload, which can automatically reset the display body from the closed state to the closed state by rotating the handle, with a simple structure and reliable operation.

Prior Art A conventional example of an earth leakage display device for an earth leakage breaker is Utility Model Publication No. 1020/1983, which has a structure in which the opening/closing mechanism and the earth leakage detection unit are housed in one case cover. However, the conventional example cannot be implemented as a display structure for an earth leakage circuit breaker with overload in which the opening/closing mechanism part of each pole and the earth leakage detection part are housed in an independent case cover as in the present application. However, there was a design problem in the structure for transmitting the opening/closing operation of the opening/closing mechanism to the display of the leakage detection section.

Embodiments Explained below with reference to the drawings, 1 is a circuit breaker with each pole, and the figure shows a two-pole circuit breaker, 2 is an insulating case, 3 is an insulating cover, 4 is a power terminal, 5 is a fixed contact, 6 7 is an arc extinguishing chamber, 7 is a movable contact facing the fixed contact 5, 8 is a load terminal, 9 is a handle, and the upper end of the movable contact 7 is supported at the bottom thereof. 10 is a bimetal whose one end is connected and fixed to the load terminal 8, the other end and the movable contact 7 are connected by a flexible conductor 11, 12 is an armature, 13 is rotatably supported by an actuating plate, and the lower end is the bimetal 10. is opposite the bottom edge of.

14 is a substantially chevron-shaped tripping rod, one end of which is rotatably supported by a shaft 15, and the other end is locked to the actuating plate 13, 16 is a tripping metal fitting, and 17 is a cutoff spring that connects to the movable contactor 7. The outer rod 14 is connected. Reference numeral 18 denotes a handle connecting piece that connects the handles 9 of the circuit breakers 1 of each pole. Reference numeral 19 denotes a trip linking rod which is rotatably supported by the case covers 2 and 3 of one of the circuit breakers 1, and the rotating contact portion 41 passes through a hole 42 in the case 2 and a hole 43 in the cover 3. The actuating plate 13 of each pole can be engaged with the actuating plate 13 of each pole.

Reference numeral 20 denotes an earth leakage detection unit, which is connected side-to-side with the circuit breaker 1, 21 is an insulating case, 22 is an insulating cover, 23 is a test button, 24 is a display, and a window 26 is connected to the case 21. It fits into the protrusion 27 to prevent it from coming out upwards, and a spring 25 installed on the window 26 and the protrusion 27 constantly applies an upward force, making it possible to protrude to the outside. Reference numeral 28 denotes a crankshaft bent into a crank shape. One end of the crankshaft passes through the hole 29 at the bottom of the display 24 so as to be rotatable, and the other end passes through the hole 30 of the case 21 and the hole 31 of the cover 3, and the other end passes through the hole 30 of the case 21 and the hole 31 of the cover 3. It is possible to engage with the other upper end of 14. An intermediate portion 32 of the Kurarek shaft 28 is held between the case 21 and the cover 22 and is rotatable.

Reference numeral 33 denotes a tripping electromagnet, and one lower end of a tripping piece 35 fixed to the end of the movable iron core 34 penetrates through the holes 30 and 31 to be able to engage with the actuating plate 13;
is a yoke, and 47 is a coil. The movable iron core 34 is constantly biased to the left by the spring 37, and the movable iron core 34
The end portion of 4 abuts against the side surface of the display body 24 and can be engaged with the engaging portion 36 . 38 is a zero-phase current transformer, 39, 39 are conductors that pass through the zero-phase current transformer 38, and both ends are connected to the holes 44, 45 of the case 21 and the case 2.
It passes through holes 48, 49 of the cover 3 and a hole (not shown) of the cover 3, and is connected and fixed to the power supply terminals 4, 4 and the fixed contacts 7, 7.

Next, to explain the operation, when the handle 9 is rotated counterclockwise from the state where the end of the tripping rod 14 is locked to the actuating plate 13 in the open state shown in FIG.
It becomes the closed circuit state shown in the figure. At this time, the other side of the crankshaft 28 is locked to the upper end of the tripping rod 14, and the crankshaft 28
8 is at the position e shown by the dotted line in FIG. 7, and the end of the movable core 34 of the engaging part 36 is locked, and the indicator 24 is held in the closed circuit position shown by the dotted line h in FIG. 7. are doing. When a leakage occurs in the electric circuit, it is input from the zero-phase current transformer 38 to the leakage detector 20, and its output excites the coil 47 of the tripping electromagnet 33, and the movable iron core 3
4 is attracted to the yoke 46 and moves to the right, the end of the tripping piece 35 presses the actuating plate 13, and the actuating plate 13 rotates to the position shown by the dotted line in FIG. 14 is released, resulting in the trip state shown in FIG. At this time, the tripping rod 14 rotates clockwise about the shaft 15, the shaft 40 presses the rotating contact portion 41, the tripping interlocking rod 19 rotates counterclockwise, and the first
As shown in Figure 0, the actuating plate 1 of the adjacent circuit breaker 1
3 counterclockwise to open the circuit. Display body 2
4, when the movable iron core 34 moves, the end of the movable iron core 34 and the engaging part 36 are disengaged, and the rotation of the outer lever 14 allows the other side of the crankshaft 28 to move downward. One side becomes movable upward, and the display body 24 rises by the force of the spring 25, as shown in FIG.
The earth leakage display state shown in is reached. The crankshaft 28 rotates about the intermediate portion 32 as a fulcrum and assumes the position f shown in FIG. To close the circuit again after removing the electrical leakage, rotate the handle 9 clockwise from the trip state shown in Figure 10, and the tripping rod 14 will rotate counterclockwise about the shaft 15 to trip. The other end of the rod 14 engages with the actuating plate 13 and is reset to the state shown in FIG. 32, one side of the crankshaft 28 is lowered, and the display body 24
is lowered against the spring 25 to reach the closed circuit position shown in FIG. At this time, from the state G shown by the dotted line in FIG. 6, in which the end of the movable core 34 is in contact with the engaging portion 36, the movable core 34 moves to the left by the force of the spring 37 as the display body 24 descends. The end of the movable iron core 34 is engaged with the step of the engaging part 36, and the display body 24 maintains the closed circuit position, and is automatically reset by the circuit closing operation of the handle 9, and then the handle 9 is rotated counterclockwise. This results in the closed circuit state shown in FIG. Next, when an overload current flows through the circuit in the closed circuit state shown in FIG. The actuating plate 13 is disengaged and enters the trip state shown in FIG. 10, and the handle 9 displays an overload opening operation indication, but the indicator 24 remains locked at the engaging portion 36 at the end of the movable core 34. Therefore, it does not protrude and can be distinguished from leakage operation.

Effects of the invention As described above, in this application, in an overload earth leakage breaker in which the opening/closing mechanism part and the earth leakage detection part are housed in an independent case cover, whether the opening/closing mechanism part and the earth leakage detection part are housed in an independent case cover is mosquito,
is in the open position or trip position of the handle 9,
Alternatively, the display body 24 can be identified by whether it protrudes or not, and the display body 24 can be automatically reset by rotating the handle 9. up and down to connect the middle part 32 of the crankshaft 28 to the earth leakage detection part 2
Since the structure is such that the crankshaft 28 is rotated while being held between the case covers 21 and 22, the rotation operation of the crankshaft 28 is stable, and the earth leakage display operation and display body
This has the practical effect of ensuring a reliable reset operation and providing a highly reliable product.

[Brief explanation of the drawing]

The figures show one embodiment of the operation display device for an earth leakage breaker with overload according to the present invention, in which Figure 1 is a front view of the earth leakage breaker, Figure 2 is a bottom view of Figure 1, and Figure 3 is a bottom view of the earth leakage breaker with overload. 1 is a diagram of the earth leakage detection section taken from A-A in FIG. 1 with the cover removed, FIG. 4 is a partial sectional view taken from B-B in FIG. C sectional view, 6th
Figures 7 and 7 are diagrams for explaining the state of the earth leakage operation display, where h indicates the closed circuit state, i indicates the earth leakage display state, and Figure 8 shows the open circuit state when the cover is removed from D-D in Figure 1. 9 is a diagram showing the closed circuit state, FIG. 10 is a diagram for explaining the open circuit state, and FIG. 11 is an exploded perspective view of the main parts. 14 is a draw rod, 21 is a case, 22 is a cover,
24 is a display body, 28 is a crankshaft, 29, 30,
31 is a hole, and 32 is an intermediate portion.

Claims (1)

[Scope of utility model registration request] A circuit breaker 1 for each pole covered by an insulating case and covers 2 and 3, and the case cover 2,
a handle 9 protruding from the outside of 3 and rotatably supported;
A movable contact 7 whose upper end is supported at the lower part of the handle 9 and faces the fixed contact 5; a substantially chevron-shaped pulling rod 14 located at the lower part of the handle 9 and rotatably supported; A cutoff spring 1 combining a rod 14 and a movable contact 7
7, an actuating plate 13 that engages with the other end of the tripping rod 14 and responds to the bimetal 10, a case that is coupled side-to-side with the circuit breaker 1 and has a built-in earth leakage detector 20, and a cover 21. 22 and the case 21
The actuating plate 1 is inserted through the hole 30 of the cover 3 and the hole 31 of the cover 3.
3, and has a tripping piece 35 that engages with the zero-phase current transformer 38.
a tripping electromagnet 33 that responds to the output of the tripping electromagnet 33; and an engaging portion 3 that engages with an end of the movable core 34 of the tripping electromagnet 33.
6, and a spring 25 that prevents the display body 24 from coming off with a protrusion 27 of the case 21 and constantly biases it upward so that the display body 24 can protrude to the outside. Hole 29 at the bottom of 24
one side is penetrated and engaged with the hole 30 of the case 21, and the other side is inserted into the hole 30 of the case 21.
and through the hole 31 of the cover 3 and the draw rod 14.
A crank-shaped crankshaft 2 that engages with the other upper end of the
8, and an operation display device for an earth leakage breaker with overload which is rotatable by sandwiching the intermediate portion 32 of the crankshaft 28 between the case covers 21 and 22 of the earth leakage detection unit 20.