JPH0155741B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to circuits and disconnectors, and particularly to improvements in their opening and closing mechanisms.

[Prior art]

Conventionally, this type of circuit breaker has been constructed as shown in FIGS. 1 to 3. Figure 1 shows the
FIG. 2 is a side sectional view showing the OFF state, FIG. 2 is the ON state, and FIG. 3 is a side sectional view showing the state at the moment of tripping. In the figure, 1 is a base made of insulating material, and 2 is a shaft 1 made up of a part of this base 1.
A handle rotatably supported around 01, 3
is a torsion spring attached to the shaft 101, one end of which is attached to the base 1 and the other end to the handle 2.
, and urges the handle 2 in a counterclockwise direction. 4 is formed in a U-shape, and one leg is a U pin or link rotatably inserted into a hole (not shown) drilled in the inner end 201 of the handle 2; A latch has a hole (not shown) into which the other leg of the pin 4 is rotatably inserted; 7 is a movable element connected to the latch 5 by a shaft 6, and supported on the base 1; A central portion of the movable element 7 is rotatably supported by a shaft 8. A lever 9 is rotatably supported by the shaft 8, and a hole at one end 901 of the lever normally engages with the latch 5. 10 is a shaft attached to the movable element 7; 11 is a torsion spring wound around the shaft 10, one end of which is hooked to the shaft 8, the other end of which is hooked to the lever 9;
This biases the force in the counterclockwise direction. 12 is a movable contact fixed to one end of the movable element 7, 13 is a shaft attached to the base 1, and 14 is the shaft 1.
3 and a tension spring stretched over the shaft 10, 15 a stator fixed to the base 1, 16 a fixed contact fixed to the stator 15 so as to face the movable contact 12, and 17 the A coil having one end electrically connected to the stator 15 and the other end electrically connected to the flexible copper stranded wire 18, 19 a terminal electrically connected to the flexible copper stranded wire 18, The wire presser 20 and the terminal 21 connect an external conductor (not shown). 22 is a yoke that is attached to the base 1 and forms a magnetic path; 23 is a plunger that is attracted to the left in the figure against the spring force of a push spring 24 when the coil 17 is excited; 25 is a plunger that is attracted to the left in the figure; The plunger 23 is loosely fitted into the hollow part of the bobbin. 26 is a rod that is driven to the left when the plunger 23 is attracted; 27 is a rod that is driven to the left when the plunger 23 is attracted; 27 is a rod that is driven to the left when the plunger 23 is attracted;
28 is an insulating tube attached to the yoke 2.
2 and an arc extinguishing chamber 42 to be described later; 29 is a flexible copper stranded wire whose one end is electrically connected to the mover 7; 30 is this flexible copper stranded wire 29;
A bimetal whose other end is electrically connected, 31 is a terminal to which one end of the bimetal 30 is fixed, and is used to connect an external conductor (not shown) through a wire presser 32 and a terminal 33. 34 is an adjustment screw screwed onto the tip of the bimetal 30; 35 is an insulating tube attached to the flexible copper stranded wire 29;
One end of the terminal 36 is fixed to the terminal 31, and the other end is fitted into the groove of the base 1. 37
38 is an insulating barrier interposed between the base 1 and the arc runner 36; 38 is a side plate made of an inorganic material disposed on both sides of the arc runner 36 in parallel with the traveling direction of the arc; 40 is the base 1; This is a mounting bracket that can be attached to a rail (not shown) with a single touch. 41 has one end hooked to the base 1, and the other end presses the mounting bracket 40 to the right. Reference numeral 42 denotes an arc extinguishing chamber for extinguishing the arc generated between the movable contact 12 and the fixed contact 16, and the arc extinguishing chamber includes a grid 43 of multiple plates.
are supported by a pair of side plates 44 at a predetermined interval. 45 is an arc discharge barrier.

Next, the operation of the conventional circuit breaker will be explained.
That is, when the handle 2 is turned clockwise (ON operation) from the OFF state of the circuit breaker shown in FIG. The movable element 7 is transmitted to the shaft 8.
The movable contact 12 contacts the fixed contact 16 by rotating counterclockwise around the center. When the handle 2 further rotates, the shaft 8 moves slightly along the groove formed in the base 1, so that the inner end of the handle 2
The toggle link mechanism formed by 01 and U pin 4 extends beyond the dead point, and the inner end 201 of the handle 2 is hooked to the base 1, completing this series of ON operations, resulting in the state shown in Figure 2. becomes. Note that the contact pressure between the movable contact 12 and the fixed contact 16 is generated by the tension spring 14. Next, the second
When the handle 2 is turned counterclockwise (OFF operation) from the ON state of the circuit breaker shown in the figure, the toggle link mechanism formed by the inner end 201 of the handle 2 and the U pin 4 bends beyond the dead point and becomes movable. The child 7 rotates clockwise around the shaft 8, and the movable contact 1
2 is separated from the fixed contact 16, as shown in FIG.
It becomes OFF state. Next, when a relatively small overcurrent such as an overload current flows, the bimetal 30
is bent by the heat generated by the latch 5, and the adjustment screw 34 provided at the tip of the bimetal 30 presses the lever 9, which rotates clockwise around the shaft 8, causing the latch 5 and lever 9 to The hook will come off. Therefore, the movable element 7 rotates clockwise around the shaft 8 due to the biasing force of the tension spring 14, and the movable contact 12 is separated from the fixed contact 16, resulting in an instantaneous trip state as shown in FIG. . Thereafter, the latch 5 is rotated clockwise about the shaft 6 by the biasing force of the torsion spring 3 via the handle 2 and the U pin 4, and the latch 5 is locked with the lever 9, as shown in FIG.
It will be the same as the OFF state. Note that the above trip is performed with a time delay characteristic. On the other hand, when a large overcurrent such as a short circuit current flows, the coil 17 is excited, the plunger 23 is attracted against the biasing force of the push spring 24, the rod 26 is pushed out, and the lever 9 is moved from the shaft 8. Rotate clockwise around
The latch 5 and lever 9 are released. After that,
The trip occurs in the same way as when an overload current occurs. Note that this trip is performed with instantaneous characteristics. However, since the conventional circuit and disconnector has the latch 5, its opening/closing mechanism is complicated, and it has disadvantages in that it is difficult to assemble and is expensive. In addition, in the event of a trip due to overcurrent, the opening/closing mechanism is complex, so the time from the occurrence of a short circuit to the opening of the contact (contact opening time) becomes longer.
Another drawback was that the ability to interrupt short-circuit current (breaking capacity) could not be improved much.

[Summary of the invention]

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional ones, and eliminates the latch member and clamps the end of the link with the movable element and the locking lever. can improve performance,
The object of the present invention is to provide a circuit breaker or disconnector that has a simple structure and is inexpensive.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. Figures 4 to 7 all show an embodiment of the present invention. Figure 4 shows its OFF state, Figure 5 shows its ON state, and Figure 6 shows its state at the moment of tripping. FIG. 7 is a side sectional view and an exploded perspective view showing the main parts thereof. In the figure,
Reference numeral 46 denotes a mover rotatably supported by the shaft 8 supported on the base 1, and has a pair of first and second latch surfaces 46a and 46b at one rotating end.
and the fixed contact 16 at the other rotating end.
The movable contact 12 is arranged opposite to the movable contact 12 . The shaft 10 is attached to the mover 46 and the shaft 1 is attached to the base 1.
The movable contact 12 is constantly biased in the direction of separation from the fixed contact 16 by the tension spring 14 stretched between the movable contact 12 and the fixed contact 16. Reference numeral 47 denotes a locking lever rotatably supported on the movable element 46 by the shaft 8, which is rotated in the opposite direction to the biasing direction of the movable element 46 by a torsion spring 48 wound around the axis 8. The latch surfaces 46a, 46 are always biased in the direction.
A locking portion 4 that clamps the other end of the U pin 4 together with b
7a.

Next, the operation of this invention will be explained. That is, the fourth
U
The pin 4 is attached to both latch surfaces 46a and 46b of the mover 46.
and the locking portion 47a of the locking lever 47. When the handle 2 is turned clockwise (ON operation) from the OFF state of the circuit breaker shown in Fig. 4, the toggle link mechanism formed by the inner end 201 of the handle 2 and the U pin 4 extends beyond the dead point. , the movable element 46 rotates counterclockwise around the shaft 8, the movable contact 12 contacts the fixed contact 16, and the fifth
It will be in the ON state as shown in the figure. Next, when the handle 2 is rotated to the left (OFF operation), the toggle link mechanism formed by the inner end 201 of the handle 2 and the U pin 4 is bent beyond the dead point, and the movable member 46 is moved clockwise around the shaft 8. The movable contact 12 is separated from the fixed contact 16, and the OFF state shown in FIG.
state. Next, when a relatively small overcurrent such as an overload current flows, the bimetal 30 bends due to its own joule heat generation, and the bimetal 30
The adjustment screw 34 provided at the tip of the locking lever 4
7 is pressed, the locking lever 47 rotates clockwise around the shaft 8, the other end of the U pin 4 is released, and the movable element 46 is rotated clockwise around the shaft 8 by the biasing force of the tension spring 14. 6, the movable contact 12 is separated from the fixed contact 16, resulting in an instantaneous trip state as shown in FIG. Thereafter, the handle 2 is rotated counterclockwise by the biasing force of the torsion spring 3, and the other end of the U pin 4 is connected to both latch surfaces 46a, 46b and the locking portion 4.
7a, and the U pin 4 is located between both latch surfaces 4.
6a, 46b and the locking part 47a, and the fourth
The state will be similar to the OFF state shown in the figure. On the other hand, if a large overcurrent such as a short circuit current flows, the coil 1
7 is energized, the plunger 23 is attracted against the biasing force of the push spring 24, the rod 26 is pushed out, the locking lever 47 rotates clockwise around the shaft 8, and the U pin 4 and other parts are rotated clockwise. Untie the ends. After that, the circuit operates in the same way as the case due to overload current and trips. In the event of a trip due to such an overcurrent, the movable element 46 of the present invention is connected to the U pin 4.
Since there is no latch 5, the contact opening time (the time from the occurrence of a short circuit to the contact opening) is shorter than the conventional one.
The short-circuit current is quickly cut off, and the cutting performance is improved. Furthermore, the structure of the present invention is simple because the latch 5 and shaft 6 are not required. Furthermore, in the conventional type, it is necessary to insert the U-pin 4 into the hole of the latch 5 or to insert the shaft 6 into each hole of the latch 5 of the movable element 7 to assemble it. As is clear from the figure, this is not necessary, automatic assembly is possible, and manufacturing is possible at low cost.

In addition, in the above embodiment, a U pin 4 formed in a U-shape is provided as the link 4, but a shape other than the U pin may be used, and the same effects as in the above embodiment can be obtained. It is something.

〔Effect of the invention〕

As described above, according to the present invention, since the movable element is directly connected to the link, the contact opening time is shortened, so that the shearing performance can be improved. Furthermore, since the structure is simple and automatic assembly is possible, it is possible to obtain circuits and disconnectors that can be manufactured at low cost.

[Brief explanation of drawings]

Figures 1 to 3 all show conventional circuit breakers; Figure 1 is a side sectional view showing its OFF state; Figure 2 is a side sectional view showing its ON state;
FIG. 3 is a side sectional view showing the state at the moment of tripping. Figures 4 to 7 all show one embodiment of this invention, and Figure 4 shows its OFF state.
Fig. 5 is a side sectional view showing the ON state, Fig. 6 is a side sectional view showing the state at the moment of tripping, and Fig. 7 is an exploded perspective view showing the main parts. . In the figure, 2 is an operating handle, 4 is a link, 12 is a movable contact, 16 is a fixed contact, 46 is a movable element, 46
a, 46b are latch surfaces, 47 is a locking lever, 47
a is a locking portion. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. One end is rotatably connected to the operating handle,
A link that forms a toggle link mechanism together with the operating handle, a movable link that is rotatably supported, has a latch surface at one rotary end, and is disposed opposite a fixed contact at the other rotary end. a movable element having a contact and biased in a direction in which the movable contact is separated from the fixed contact; a movable element rotatably supported by the movable element; and disposed at a rotation end facing the latching surface. A locking lever having a locking portion that is always biased in the direction of the latch surface, and an overcurrent tripping device that operates the locking lever when an overcurrent of a predetermined value or more flows, When the other end is clamped between the latch surface and the locking part and the two contacts are brought into contact and separated by operating the operating handle and an overcurrent of a predetermined value or more flows, the overcurrent is adjusted to release the clamping. A circuit breaker characterized in that a tripping device operates the locking lever to open and separate the contacts. 2. The circuit breaker according to claim 1, wherein the link is formed of a U-shaped pin.