JPH0129292B2 - - 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 a U pin formed in a U shape, one leg of which is rotatably inserted into a hole (not shown) drilled in the inner end 201 of the handle 2;
5 is a latch having a hole (not shown) into which the other leg of the U pin 4 is rotatably inserted; 7 is a movable element connected to the latch 5 by a shaft 6; The movable element 7 is
The central part of the frame is rotatably supported. 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; It biases counterclockwise. 12 is a movable contact fixed to one end of the movable element 7; 13 is the base 1;
14 is a shaft attached to this shaft 13 and the above shaft 1.
0 is a tension spring stretched, 15 is a stator fixed to the base 1, 16 is a fixed contact fixed to the stator 15 so as to face the movable contact 12, and 17 has one end fixed to the above fixed contact. a coil whose other end is electrically connected to the flexible copper stranded wire 18; 19 is a terminal electrically connected to the flexible copper stranded wire 18; terminal 2
1 connects 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 an insulation tube between the yoke 22 and the arc extinguishing chamber 42, which will be described later. 29 is a flexible copper stranded wire whose one end is electrically connected to the movable element 7; 30 is a bimetal whose other end is electrically connected to the flexible copper stranded wire 29; 31 is an isolating insulating barrier; This bimetal 3
0 is a terminal to which one end 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, and 35 is the flexible copper stranded wire 29.
One end of the insulating tube 36 attached to the base 1 is fixed to the terminal 31, and the other end is fitted into the groove of the base 1. 37 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 to the arc running direction; 40 is the base 1, which can be attached to a rail (not shown) with a single touch. 41 has one end connected to base 1 above.
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, in which a plurality of plates of grit 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 rotated 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, as shown in FIG. The state shown is shown. 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
From the circuit and disconnection ON state shown in the figure, handle 2
When 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 bends beyond the dead point, and the movable member 7
rotates clockwise around the shaft 8, and the movable contact 12
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 due to its own heat generation, 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, 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. Then twist spring 3
Due to the urging force of the handle 2 and the U pin 4,
The latch 5 rotates clockwise around the shaft 6,
The latch 5 is engaged 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-mentioned 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 circuit operates in the same way as the case due to overload current and trips. 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) becomes long, making it difficult to suppress the short circuit current. The drawback was that the cutting ability (cutting capacity) could not be improved much. Furthermore, since the conventional circuit breakers and circuit breakers have the latch 5, they have the disadvantage of being complicated to assemble, difficult to assemble, and expensive.
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 drawbacks of the conventional ones as described above, and instead of using the latch member, the first and second latch surfaces provided on the mover and the locking lever are provided. By loosely fitting and connecting the first, second, and third rollers that contact the locking portions, respectively, to the U pin, improved shearing performance and stable operation can be obtained, and the structure is simple. The purpose is to provide inexpensive circuit breakers and disconnectors.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 4 to 7 all show one embodiment of the present invention, and FIG. 4 shows the OFF state in the 5th embodiment.
The figure shows 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, 4
6 is a movable element rotatably supported by the shaft 8 supported on the base 1, and has a pair of first and second latching surfaces 46a and 46b at one rotating end; In addition, the movable contact 12 is provided at the other rotating end and is disposed opposite to the fixed contact 16. The shaft 10 attached to the mover 46 and the shaft 13 attached to the base 1
In addition, the movable contact 12 is constantly biased in a direction in which the movable contact 12 is separated from the fixed contact 16 by the stretched tension spring 14 .

Reference numeral 47 denotes a locking lever that is rotatably supported on the movable element 46 by the shaft 8 and has a locking portion 47a. It is always biased in the opposite direction to the biasing direction. Reference numerals 49, 50, and 51 are first, second, and third rollers that are rotatably fitted loosely into the other leg of the U-pin 4 and are connected to each other. the second roller 50 to the locking portion 47a, the third roller 51 to the second latch surface 46b,
Normally, they are in contact with each other and the other leg of the U-pin 4 is locked.

Next, the operation of this invention will be explained. That is, the fourth
U
The pin 4 is held between the latch surfaces 46a, 46b of the movable member 46 and the locking portion 47a of the locking lever 47 via the respective rollers 49, 50, 51, so that the U-pillar 4 is locked. The circuit and disconnector shown in Figure 4
Turn handle 2 clockwise from OFF state (ON operation)
Then, 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 mover 46 rotates counterclockwise about the shaft 8, and the movable contact 12 becomes the fixed contact. 16 and enters the ON state shown in FIG. Next, when you turn handle 2 to the left (OFF operation), handle 2
The toggle link mechanism formed by the inner end 201 and the U pin 4 bends beyond the dead point, the mover 46 rotates clockwise about the shaft 8, and the movable contact 12 opens from the fixed contact 16. When it is released, it enters the OFF state shown in Fig. 4. Next, when a relatively small overcurrent such as an overload current flows, bimetal 3
0 is bent by the heat generated by its own module, the adjustment screw 34 provided at the tip of the bimetal 30 presses the locking lever 47, and the locking lever 47 rotates clockwise around the shaft 8. The first, second and third rollers 49, 50, 51 are connected to both latch surfaces 46a, 46.
b. They are removed from the locking portions 47a.

Therefore, the U pin 4 is released and the tension spring 1 is released.
The movable element 46 rotates clockwise about the shaft 8 due to the biasing force 4, 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 each roller 49,
50, 51 are located between both latch surfaces 46a, 46b and the locking portion 47a, and the U pin 4 is positioned between each roller 4.
Both latch surfaces 46a, 46 via 9, 50, 51
b and the locking portion 47a, the U pin 4 is locked, and the state is the same as 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, the plunger 23 is attracted against the biasing force of the push spring 24, the rod 26 is pushed out, and the locking lever 47 is Each roller 49, 50, 51 rotates clockwise around the shaft 8.
are removed from both latching surfaces 46a, 46b and the locking portion 47a, respectively, and the U-pin 4 is released from the lock. 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 device of the present invention smoothly moves in opposite directions, with the first and third rollers 49 and 51 moving in the direction A and the second roller 50 moving smoothly in the direction B, as shown in FIG. Since the rollers 49, 50, and 51 are divided into parts so that they rotate, and because the mechanism is simple and does not have the latch 5 of the conventional one, the contact opening time (from the occurrence of a single circuit to the contact opening) Since the short circuit current is quickly cut off, the cut-off performance is improved. Furthermore, the structure of the present invention is simple because the latch 5 and the shaft 6 are not required, and the conventional structure requires the U pin 4 to be inserted into the hole in the latch 5, and the movable element 7 and the latch 5 to be connected to each other. It is necessary to assemble the shaft 6 by inserting it into the hole, but as is clear from FIG. 6, the present invention does not require this, and can be assembled automatically and manufactured at low cost.

Furthermore, when the circuit or disconnector is tripped or automatically reset, the rollers 49, 50, and 51 smoothly rotate in opposite directions, so that the U-pin 4 is smoothly locked and unlatched. , the operation is stable.

〔Effect of the invention〕

As described above, according to the present invention, the U pin is clamped and locked to the movable member by the locking lever via the first, second, and third rollers, so that the contact is opened. Since the time is shortened, it has the effect of improving shearing performance and stabilizing the 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 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 U pin, 12 is a movable contact, 16 is a fixed contact, 46 is a movable element, 46
47 is a locking lever, 47a is a locking portion, and 49, 50, and 51 are first, second, and third rollers. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A U pin formed in a substantially U-shape, one end of which is rotatably connected to the operating handle, and forming a toggle ring mechanism together with the operating handle; a U pin that is rotatably fitted loosely into the other end of the U pin; first, second, and third rollers that are connected to each other; first and second rollers that are rotatably supported and are disposed at one rotating end to face the first and third rollers, respectively; 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 is separated from the fixed contact; The movable roller is rotatably supported by the movable element, and has a locking part disposed at the rotating end facing the second roller, and is constantly biased in a direction opposite to the biasing direction of the movable element. A locking lever is provided, wherein the first roller is normally placed on the first latching surface, the third roller is on the second latching surface, and the second roller is on the latching portion. By making contact, the other end of the U pin is locked, and the operating handle connects and separates the contacts, and when an overcurrent of more than a predetermined value flows, the locking lever is activated to release the lock. A circuit disconnector characterized in that both of the contacts are opened.