JPS59189529A - Wiring breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an electronic circuit breaker, and particularly to a reset mechanism suitable for automatically resetting a tripping mechanism.

[Background of the invention]

Generally, the magnetic tripping device used in this type of circuit breaker performs the tripping operation by a weak signal from the overcurrent detection unit, so the magnetic flux of the permanent magnet is used to release the d.
The movable armature is held in the reset position by overcoming the force of the spring, and the magnetic flux generated by the tripping coil cancels the magnetic flux of the permanent magnet to release the movable armature, which is then held by the force of the spring. This device moves the breaker to the tripping position and transmits the movement to the exception member inside the breaker, and unlike the normally used thermal electromagnetic exception device, it is used to make the exception device operable again. In this case, the movable armature must be returned from the exception position to the reset position by an external force.

Conventionally, the mechanism for resetting the magnetic string removal device is as follows:
As an exception, there is a device in which the movable armature of the magnetic line removal device is moved to the reset position via an actuator in contact with one end of the handle by the reset operation of the breaker operating handle after operation; It is fully described in Publication No. 18861 and Japanese Patent Publication No. 5A-SSOS. There is a device in which the movement of the breaker contact arm to the open position due to the switching operation is transmitted via an actuator to the movable armature of the magnetic line removal device to move it to the reset position. It is described in No. 31JA2A.

However, with the method of resetting using the handle, the device must work not only in the ON state but also in the OFF state due to the magnetic pull-off, so the slight displacement of the handle between the OFF state and the reset state must be controlled by tJ. The magnetic trip device must be reset. In addition, since the actuator cannot be released after the reset is completed, the actuator interferes with the movement of the movable armature.Also, the method of resetting via the actuator by movement of the contact arm requires the support member of the contact opening/closing mechanism part of the contact arm, the magnetic tripping device, Latch #16 structure is omitted.
Since each of these parts is foamed separately and consists of many parts, precision of the component parts and precision of adjustment work are required. Therefore, when the circuit breaker is opened, closed, or disconnected, the high-speed mechanical operation and overstroke cause deformation of the component parts, resulting in malfunction. In the case of the above-mentioned tokuizawa, it is also unreliable because it uses a slight displacement of an excessive force.

``Object of the Invention'' The object of the present invention is to provide an automatic reset mechanism that can reliably perform the reset operation of the magnetic string removal device immediately after exception,
In particular, an object of the present invention is to obtain a highly reliable exception mechanism for a circuit breaker, which has a reset mechanism configured not to interfere with the operation of the exception mechanism when the reset mechanism is activated.

"Summary of the Invention" The present invention provides a molded case circuit breaker equipped with a magnetic tripping device, in which the resetting operation of the magnetic tripping device can be reliably performed, and the reset mechanism can provide an exception mechanism that does not interfere with the operation. The exception mechanism includes a magnetic line removal device, an exception force transmission means connected to the magnetic line removal device and slidably provided, an actuator driven by the exception force transmission means Qi, and an actuator driven by the exception force transmission means; an exception means driven by an actuator; an interlocking means provided on the exception means so as to be pressed by locking of the knock to the exception means; and an interlock means loosely fitted in the exception force transmission means. a reset lever provided, a reset lever holding means stretched between the reset lever and the interlocking means, a reset lever biasing means provided to bias the reset lever in the reset direction; an engaging part for the reset lever provided on a force transmitting means, and when the exception mechanism is on standby, the reset lever is provided at a position exceeding the stroke of the engaging part; The interlocking means is activated by releasing the lock between the exception means and the hook, and biases the reset lever in the reset direction via the reset lever holding means and the reset lever biasing means. It is something to do.

"Embodiments of the Invention" Examples of the present invention will be described below with reference to FIGS. 1-f and 1A.

FIG. 1 shows the overall structure of a q-hair breaker according to an embodiment of the present invention. Inside the P-edge case 1, primary and secondary conductors +2a and 12b are provided near the bottom.
A fixed contact 22 is provided on the primary conductor +2a, and the secondary conductor 12b is provided so as to pass through a current transformer 7 as a current detection means provided for each phase. A movable contact 21 is located between the primary conductor +2a and the secondary conductor 12b.
A contact opening/closing mechanism 24 is provided, and the movable contact 2
1 is connected to the secondary conductor 12b in a claw-like manner. The contact opening/closing mechanism 24 includes a handle 2 for operating from the outside and a hook 3 for automatic male operation in the event of overcurrent, etc.
It consists of: The arc chute 23 is strung around the contact portion.

The current signal detected by the current transformer 7 is supplied to a trip circuit 8 consisting of an electronic circuit, exchanged with a trip signal, and supplied to a magnetic exception device 9. The tripping mechanism 25 includes a magnetic exception device 9, a trip fitting 4 as a tripping means, and a receiver 5.
, frX6 as an actuator, a lever 11 as an interlocking means, a reset lever 16, a tension spring 14 as a reset lever holding means, and a compression spring 15 as a reset lever biasing means. It is equipped with a trip button 20. FIGS. 2, 6, and 4 show the positional relationship of each component of the tripping mechanism during normal operation, tripping, and resetting, respectively. The claw receiver 5 is provided with a stopper 34 at the lower end part Ad of the trip fitting 4, and is rotatably provided on the support @31. It is locked.

As shown in FIG. 5, the trip fitting 4 includes an engaging portion 4a that engages with the tip 3a of the hook 6, a notch 14bedc, and a lower end mad. ) is applied in the counterclockwise direction. The cut portion Ab
is provided to prevent interference when the tip portion 3a of the hook looper is locked to the engaging portion Bla during normal times and during gamma reset. The notch AC is provided in a substantially U-shape and is loosely inserted into the support shaft 32, and the lower end Ad is slidably stepped in contact with the stopper 3A, and is not pulled due to stiffness. It is configured to facilitate the release of the hook 3 at the time of removal and the re-locking of the hook 3 at the time of reset. The pawl 6 is rotatably supported on a support shaft 30, and includes a stopper portion 6a that abuts against the protrusion pawl receiver 5, and a pin 10a of the magnetic tripping device 9, which is provided approximately one angle from the stopper portion 6a.
an actuator section 6b that transmits the movement of the trip button 20, and another actuator section 6C that is provided in a direction substantially perpendicular to the actuator section 6b and approximately 180 degrees different from the stopper section 6a and that transmits the movement of the trip button 20. Become. The lever 11 is formed approximately in the shape of a "<", the center part of the lever is rotatably supported on a support shaft 62, the upper end has an abutment part 11a that engages with the hook 6, and the lower end has a tension bar. 1
4 mounting holes 111). Reset lever 1
6 is rotatably provided on the support 111I+36 in this embodiment, and the tension holder 1A is provided as shown in FIG. 14 (Al).
The mounting hole 16a, the loose fitting part 16b1 with the pin 111a, and the loose fitting part 13C with the guide 63. The guide 63 is provided parallel to the pin 10a of the magnetic shield 9, has a stopper 61 at one end, and has the other end connected to the mounting plate 6'2Kji!
The reset lever is equipped with 15 compression springs as biasing means, and the reset lever 16 is magnetically released and biased in the direction of the device 9. The lever 11 and the reset lever 13 are connected by a tension spring 1A, and the movement of the lever 11 is transferred to the reset lever 13 by the tension spring 1A.
The magnetic tripping device 9 is configured to transmit via A and has a movable armature 10 therein, and
The movable armature 10 is provided with a pin 10a at its tip, and the pin 10a is moved in the reset direction by engagement between a contact plate 40 as an engaging portion provided on the pin 10a and a loose fitting portion 131) of the reset lever 13. driven by.

The internal structure of the magnetic removal device 9 is shown in FIG. 7 (Al-(B). FIG. 7 fA) shows the reset state;
Figure (B) shows the state during the tripping operation.

The magnetic removing device 9 has a case formed by a support frame 41 made of a magnetic material and a yoke A2, a coil A5 and a permanent magnet 43 are provided in the case, and a bobbin A6 of the coil is provided.
A movable armature made of a magnetic material is fitted into the center of the movable armature 10, and the movement of the movable armature 10 is transmitted to the outside via a guide AA. Note that the armature portion 49 of the movable armature 10
A compression spring 47 is provided between the coil bobbin 46 and the coil 45, and is configured to bias the movable armature 10 when the coil 45 is reversely electrified. The operation of the magnetic exception device is as follows.

Since magnetic flux passing through the movable armature 10 and the support frame 41 is normally supplied from the permanent magnet A6, the movable armature 10 overcomes the force of the compression spring 47 and is attracted to the support frame A1. A tripping current is supplied from the circuit 8 to the coil 45! When the coil 15 is turned off, the coil 15 generates a magnetic flux in the opposite direction to the magnetic flux generated by the permanent magnet 43, and the movable armature 10 and the support rod 11
Cancels the adsorption power of Therefore, the movable armature 10 is moved by the compression spring A7 until it comes into contact with the guide 45, as shown in FIG. 7 (El).

Next, Figure 5 (A
1-(cl, ¥6 figure(A1-(El, figure 7(A)~(
This will be explained by Bl. Note that the manual trip button 20 and actuator 6C are not shown in FIG. 5 (A1-(C) and FIG. 6 (A1-(Ej)).

During normal energization, as shown in FIG. 51 (A) and FIG.
'(++a is pressed. In this state, lever 1
1 pulls the reset lever 13 through the tension spring 14 and compresses the compression spring through the reset lever 13. The front set lever lever is stopped at a position exceeding the stroke of the contact plate 40 due to the tension between the tension spring 1A and the compression spring 15. The trip fitting 4 is supported at its lower end Ad by a stopper 3A provided on the nohe receiver 5, and since the upper part of the above-mentioned r\holder 5 is locked by the stopper 6a, the trip fitting AI'L hook 3 is Hold the anchorage.

At the time of trip, trip 1-1 path 8 also has trip voltage y.
When the lff is supplied to the magnetic exchanger 9, as shown in FIG. 7 (B
), the movable armature 10 is urged by the spring 47 and moves in the direction of the yoke 42. As a result, the bin 10a provided at the tip of the movable armature 10 is
As shown in the figure, the actuator 6 is biased in the direction of arrow A.
b, as shown in Fig. 6 (C1)] ((6
The stopper 6 is rotated around the support shaft 30 in the direction of arrow B.
Release the lock between a and ] [\ receiver 5. Since the hook 6 is biased in the direction of the arrow by the biasing means (not shown) of the tripping mechanism 2A, the force causes the trip fitting t to move upward and downward as shown in FIG. 5 (Bl). Turn in C direction t'l
-J, release the lock with the trip fitting 4 and pull out the tripping mechanism 2A.

At this time, since the pressing force of the hook 5 is no longer applied to the abutting portion 11a of the lever 11, the lever 11 becomes rotatable in the direction of the noon mark F as shown in the 61st FI (Dl), and the restoring force of the compression spring 15 As a result, the reset lever 13 is urged in the direction of the arrow H, and moves to a position where it contacts the stopper 61 while pushing the half plate 7IO with the loose fitting portion 13b.As a result, the movable armature 10 is pushed back to the initial position. , the magnetic flux of the permanent magnet A3 attaches it to the support frame A1 again and returns to the initial state, and the magnetic flux is removed and the device wt9 is reset.After this state, if the circuit breaker is tripped, as shown in Fig. 6. The handle 2 remains at the trip position as shown in Figure 4.The circuit breaker can be reset by returning the handle 2 to the reset position as shown in Figure 4. ) as shown in FIG.
Touch and press the ia diagonally. Since the U-shaped notch 4c of the trip fitting A loosely fits into the support shaft 32, the trip fitting A slides in the direction of arrow C due to the pressing force of the tip 3a of the hook 6, and the hook 5 further moves in the direction of the arrow C. #Engagement part 4 in H direction
Since the reset mechanism is relatched to the point a, the reset mechanism returns to the state shown in FIG. 6 (El) and then back to the state shown in FIG. 6 (Al).

At this time, the hook 3 presses the contact portion 11a of the lever 11, transmits the movement of the lever 11 to the reset lever 16 via the tension spring 1/1, and moves the reset lever 16 to the contact plate A.
Move it to a position exceeding the O-& stroke and return it to the initial state.

According to this embodiment, during the tripping operation of the magnetic lamp tripping device, the reset lever 13 is on standby at a position greater than the stroke of the bin 10a, and the driving force of the bin 10a is small because it does not hinder the movement of the bin 10a. The device can be made smaller and lighter. In addition, the lever 11 is pressed by the lever 11 during tracking and resetting, but when it is tripped, the suppression is released, and the resulting rotational movement of the lever is used to drive the reset mechanism, so a constant reset force is applied. can get. Since excessive force is not applied to each twisted part, deformation of the parts is less likely to occur, resulting in a long service life. In other embodiments, as shown in FIG. 8, a return spring 15' may be provided on the bottle 10a and the guide may be omitted, since the stroke of the return spring 15' may be small.
There is a margin for the stress of the return spring 15' at the time of resetting. Further, the reset lever biasing means may be a tension spring 15 as shown in FIG. Furthermore, the urging means is
A screw spring 50 may be used as shown in the figure.

Furthermore, as shown in FIG. 11, if the reset plate 52 is provided on the guide plate 62 using a torsion spring 51, the position adjustment work during assembly can be simplified by +ffi.

Furthermore, in different embodiments, the movement of the reset lever 53 may be horizontal movement as shown in FIG.
According to this, the movement of the reset lever 53 is minimized, and the device is made smaller and can be stored in a narrow space. In addition,
If configured as shown in FIG. 12) (B), the guide 63 may be provided on one side. In this case, the tension spring 14 receives a bending force when passing through the guide plate A2, but since the spring material has elasticity, it does not form a pot shape. In a further different embodiment, as shown in FIGS. 13(A) and 13(B), the reset ports 54 and 5a/ may be provided with an elastic body. According to this, the mechanical part can be simplified, the number of assembly steps can be reduced, and the device can be made smaller and smaller. The elastic body may be a spring or a soft synthetic resin plate. In this case, the mounting portion of the tension spring 14 may be provided with reinforcement (not shown) if necessary.

Figure 1IIIi shows the shape of the reset lever and guide.

In this embodiment, the reset lever is provided with a loosely fitting part between the bottle and the guide as in 1 ii Fl (A+).The shape of the loosely fitting part between the reset lever and the guide is shown in Fig. 1A (Bl
~(As in Di, the guide may be a groove-shaped guide 3', and the loose fitting part with the guide 63' may be the upper end M of the reset lever 16 as in 130', and K is 15q" It is also possible to provide a notch like this.
rg+ (Fl), the kite may be formed into a strip shape as shown in 63", and the engaging portion may be formed in a groove shape as shown in 13c"'.

1, the loose fitting part between the reset lever 13 and the bottle 10a is the first one.
It may be cut out as shown in Figure 4 (DI/(Fl), and this will improve work efficiency when assembling parts.

Further, the lever 11 may also be used as a lever for operating an alarm switch (not shown) as an internal accessory device.

"Effects of the Invention" The present invention 1 is an automatic reset mechanism that is reliably performed by reliably performing the reset operation for removing and aligning the magnetic distribution 41 immediately after tripping, and especially when the reset mechanism is tripping, the tripping mechanism is 1
To obtain a highly reliable tripping mechanism for a molded case circuit breaker, which is configured so as not to interfere with one operation.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing the configuration of a hardwire circuit breaker in an embodiment of the present invention, and Figs. When passing through the government・
FIG. 5 is a front view showing the engaged state of the hook and trip fitting in an embodiment of the present invention; FIG. 4) and FIG. FIG. 7 is a longitudinal sectional view of the magnetic tripping device in one embodiment of the present invention, and FIGS. 8, 9, 10, and 11 are front views showing the operation process of the reset mechanism in one embodiment. FIG. 12 is a front view showing another embodiment of the invention; FIG. 13 is a front view showing a further different embodiment of the invention; 1Ii (b) 1(A) is an oblique view showing the shape of the reset lever, guide, and bin in one embodiment of the present invention; ·guide·
It is a side view showing the shape of a bottle. 2... Hand knife 3... Hook, A. 5... Tripping means, 6... Actuator, 8... Tripping circuit,
9° magnetic tripping device, 10a... tripping blade transmission means,
11... Interlocking means, 13... Reset lever, 1A
...Reset lever holding means, 15...Reset lever biasing means, 25...Tripping mechanism, AQ...Engagement part A+

Claims (1)

[Scope of Claims] A contact opening/closing mechanism including a hook linked to a non-entry lever for opening/closing the opening/closing contact, a tripping mechanism for the contact opening/closing mechanism, and supplying a tripping signal to the tripping mechanism. In the molded circuit breaker comprising a tripping circuit, the tripping mechanism includes a magnetic tripping device, the magnet, a tripping force transmitting means slidably connected to the tripping device, and the an actuator driven by a tripping force transmitting means; a tripping means adapted to the actuator; and a tripping means provided on the tripping means so as to be pressed when the hook is engaged with the tripping means. established. a reset lever loosely fitted to the interlocking means and the tripping force transmitting means; a reset lever (-) holding means stretched between the reset lever and the movement means; and a reset lever biasing means provided to bias the trigger in the reset direction, and the tripping force transmitting means includes an engaging portion with the reset lever, and when the tripping mechanism is on standby, The reset lever is provided at a position exceeding the stroke of the engaging portion, and when the reset lever is disengaged, the reset lever is moved by the reset lever holding means and the reset lever biasing means as the interlocking means operates. A molded circuit breaker characterized in that it is configured to be biased in a reset direction.