JPH0155742B2 - - 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.
The handle 2 is hooked to the handle 2 and biases 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 end 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 an insulating tube attached to the flexible copper stranded wire 18, and 28 is the yoke 22.
29 is a flexible copper stranded wire whose one end is electrically connected to the movable element 7, and 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;
36 has one end fixed to the terminal 31 and the other end fitted into the groove of the base 1. 37 is an insulation barrier interposed between the base 1 and the arc runner 36; 38 is the arc runner 36;
Side plates 40 made of an inorganic material are arranged on both sides of the base 1 in parallel with the traveling direction of the arc, and 40 are mounting fittings provided on the base 1, which can be mounted 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 a plurality of grids 43 are supported by a pair of side plates 44 at predetermined intervals. 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 or disconnector shown in FIG.
is transmitted to the movable element 7, which rotates counterclockwise about the shaft 8, and the movable contact 12 contacts the fixed contact 16. When the handle 2 further rotates, the shaft 8 moves slightly along the groove formed in the base 1, so that the inner end 20 of the handle 2
The toggle link mechanism formed by U-pin 1 and U-pin 4 extends beyond the dead point, and the inner end 201 of handle 2 is locked to base 1, completing this series of ON operations, resulting in the state shown in FIG. 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, if a relatively small overcurrent such as an overload current flows, the bimetal 30
is bent by the heat generated by the latch 5, the adjustment screw 34 provided at the tip of the bimetal 30 presses the lever 9, and the lever 9 rotates clockwise around the shaft 8, causing the latch 5 and lever 9 to The hook will come off.

Therefore, due to the biasing force of the tension spring 14, the mover 7
rotates clockwise around the shaft 8, 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. In other words, it is automatically reset. 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, because conventional circuit breakers have complicated opening/closing mechanisms, when a trip occurs due to an overcurrent, the time from the occurrence of a short circuit to the opening of the contacts (contact opening time) increases, making it difficult to cut the short circuit current. It has the disadvantage that the ability to disconnect (shrinkage capacity) cannot be improved much.Furthermore, since the conventional circuit breakers have a latch 5, the assembly is complicated, making it difficult to assemble and expensive. There was also a drawback.
In addition, since the latch 5 is locked by hooking into a hole drilled in the lever 9, the sheared burrs of the latch 5 and lever 9 allow the latch 5 and lever 9 to engage smoothly when tripping. There were also disadvantages in that the latch 5 did not release automatically, or after tripping, the latch 5 did not engage with the hole in the lever 9 and did not automatically reset, resulting in unstable operation.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional link.The latch member is eliminated and the roller provided at the end of the link is held between the movable element and the locking lever. The object of the present invention is to provide a circuit breaker which has improved insulation performance and stable operation, and which 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.
3, the movable contact 12 is always urged in the direction of separating from the fixed contact 16 by the tension spring 14. 47 is rotatably supported by the movable member 46 by the shaft 8, and is a locking portion 47a.
This is a locking lever having a locking lever, which is always biased in a direction opposite to the biasing direction of the movable element 46 by a torsion spring 48 wound around the shaft 8. Reference numeral 49 denotes a roller rotatably fitted loosely on the other leg of the U-pin 4, and is normally held between the latch surfaces 46a, 46b and the locking portion 47a. Next, the operation of this invention will be explained. That is, in both the OFF state of the circuit breakers and breakers shown in FIG. 4 and the ON state of the circuit breakers and breakers shown in FIG. The U pin 4 is locked by being held by 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 or disconnector shown in FIG. The movable element 46 rotates counterclockwise around the shaft 8, and the movable contact 12 connects to the fixed contact 1.
6 and enters the ON state shown in FIG. Next, turn handle 2 to the left (OFF operation),
The toggle link mechanism formed by the inner end 201 of the handle 2 and the U pin 4 bends beyond the dead point, the movable element 46 rotates clockwise around the shaft 8, and the movable contact 12 connects to the fixed contact 16. separated from
It becomes the OFF state shown in FIG. 4. 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 adjustment screw 34 provided at the tip of the bimetal 30 locks the locking lever 47. Press and lock lever 47
rotates clockwise around the shaft 8 and releases the grip of the roller 49. Therefore, the U pin 4 is unlocked,
The movable element 46 rotates clockwise about 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 handle 2 is rotated counterclockwise by the biasing force of the torsion spring 3, and the roller 49 is moved between both latch surfaces 46a, 46b and the locking portion 47.
a roller 49 is located between both latch surfaces 4
6a, 46b and the locking portion 47a, the U pin 4 is locked, and the state is similar to the OFF state shown in FIG. In other words, it is automatically reset. On the other hand, when a large overcurrent such as a short circuit current flows, the coil 17 is excited and the plunger 2
3 is attracted against the biasing force of the push spring 24,
The rod 26 is pushed out and the locking lever 47 is moved to the shaft 8.
It rotates clockwise around , the roller 49 is released and the U pin 4 is released.

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 present invention prevents the mover 4 from
6 is connected to the U-pin 4 via a roller 49, and since there is no latch 5, the contact opening time (the time from the occurrence of contact to the contact opening) is shorter than the conventional one. Therefore, the short-circuit current is quickly cut off, and the cutting performance is improved. Furthermore, the present invention has a latch 5
Since the shaft 6 and shaft 6 are not required, the structure is simple, and the conventional one is assembled by inserting the U pin 4 into the hole of the latch 5, or inserting the shaft 6 into the respective holes of the mover 7 and the latch 5. However, as is clear from FIG. 6, the present invention does not require this, and can be assembled automatically and manufactured at low cost.

Furthermore, since the roller 49 rotates when the circuit or disconnector is tripped or automatically reset, the U-pin 4 is smoothly locked and unlocked, resulting in stable operation.

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

[Effects of the Invention] As described above, according to the present invention, since the roller provided on the link is held between the movable element and the locking lever, the contact opening time is shortened, and the contact is easily disconnected. This has the effect of improving performance and stabilizing operation. 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 an embodiment of the present invention, with Figure 4 being a side sectional view showing its OFF state, Figure 5 being a side sectional view showing its ON state, and Figure 6 being a side sectional view showing its ON state. 7 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, and 49 is a roller. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1 One end is rotatably connected to the operating handle,
A link forming a toggle link mechanism together with the operating handle, a roller rotatably provided at the other end of the link, and a rotatably supported link disposed opposite the roller at one rotary end. A movable element having a latch surface and a movable contact disposed at the other rotating end opposite to the fixed contact, the movable element being biased in a direction in which the movable contact separates from the fixed contact; a locking lever that is rotatably supported on the child and has a locking portion at a rotating end facing the latch surface and constantly biased toward the latch surface; Equipped with an overcurrent trip device that operates the locking lever when current flows, the roller is normally held between the latch surface and the locking portion, and the two contacts are connected and separated by operating the operating handle. and when an overcurrent exceeding a predetermined value flows, the overcurrent tripping device operates the locking lever to release the clamping, thereby opening both the contacts. .