JP2941994B2 - Earth leakage breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[Object of the Invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth leakage circuit breaker in which when an earth leakage current or overcurrent is detected, an electromagnet is actuated to disengage a trip member by an actuating member and perform a breaking operation. About.

[0003]

2. Description of the Related Art Conventionally, as this kind of earth leakage breaker, FIG.
Or the one shown in FIG.

In this case, a main body case 1 comprises a case main part 2 and a cover 3. An operation handle 4 is provided at the center of the main body case 1 so as to be rotatable in a vertical direction.
The power is transmitted to the opening / closing mechanism 6 via the interlocking lever 5.

As shown in FIGS. 10 and 11, the interlocking lever 5 is provided so as to be rotatable around a shaft 7 as a fulcrum.
The torsion coil spring 8 is urged to rotate counterclockwise. The interlocking lever 5 has a protruding piece 5a formed on the upper left side and a rod 9 provided below.

[0006] On the other hand, the opening / closing mechanism 6 has a catch 10 rotatably provided and a catch receiver 12 rotatably provided about a shaft 11 as a fulcrum. When the catch receiver 12 engages with and receives the tip of the catch 10, that is, in the state shown in FIG. 10, the opening / closing mechanism 6 closes the main circuit. Then, the catch receiver 12 rotates clockwise, and the catch 10
When the catch 10 is rotated counterclockwise, that is, when the state shown in FIG. 11 is released, the opening / closing mechanism 6 performs a breaking operation to open the main circuit. Has become. In this case, catch catch 12
Constitutes a trip member, which is always urged to rotate clockwise and has a claw portion 12a at a lower portion.

A tripping device 13 is provided in the main body case 1, and a frame 14 of the tripping device 13 is provided.
Are rising wall portions 14a and 14 rising upward from the bottom.
b, a housing portion 15 that opens downward. A release type electromagnet 16 is provided in the housing portion 15, for example. The release type electromagnet 16 is a plunger 1 which is normally sucked and held at a position shown in FIG. 9 by a built-in permanent magnet.
6a, and when energized, the force for sucking and holding the plunger 16a is weakened.

Here, the rising wall portion 14a of the frame 14
And 14b, an operating member 17 is provided movably in the left-right direction in FIG. 10 (the up-down direction in FIG. 9). As shown in FIG. 12, the operating member 17 has a pair of rising walls 17b and 17c on the right side of the upper surface of the substrate 17a.
A pair of falling wall portions 17d is provided on the lower left portion of the substrate portion 17a.
17e. Engagement steps 17f, 17g are formed on the upper left ends of the rising walls 17b, 17c, and the catch receiver 1 is formed on the engagement steps 17f, 17g.
2 engages as shown in FIG. 10, and this engagement prevents the catch receiver 12 from rotating clockwise.
The shut-off operation of the opening / closing mechanism 6 is prevented.
In addition to the operation member 17, a concave step 17h is formed on the lower surface of the substrate 17a.

On the other hand, a sliding member 18 is provided below the operating member 17 so as to be movable in the left-right direction in FIG.
This sliding member 18 is, as shown in FIG.
a has a pair of rising wall portions 18b and 18c on the right side of the upper surface of the substrate a, and has a pair of falling wall portions 18 on the left side of the lower surface of the substrate portion 18a.
d, 18e. Also, the substrate 1 of the sliding member 18
On the lower surface of 8a, a convex portion 18f is protruded toward the right in FIG. 10, and a convex portion 18g is protruded toward the left in FIG.
A protrusion 18h is formed on the upper surface of the substrate 18a. Further, an upright portion 18i is formed at the left end of the substrate portion 18a of the sliding member 18.

The operating member 17 overlaps the sliding member 18 as described above in a horse-riding manner (see FIG. 14), and a compression coil spring 19 is provided between the two as shown in FIG. The operating member 17 and the sliding member 18 are respectively connected to the rising walls 17b, 17c and 18b, 18c.
The elongated holes 20 and 21 formed in the holes are inserted through the shaft 22, and the respective falling walls 17d, 17e and 18 respectively.
The long holes 23 and 24 formed in d and 18e are connected to each other by being inserted into a shaft 25. The sliding member 18 is
The protrusion 1 is formed by a torsion coil spring 26 provided on the shaft 22.
8g is pressed and urged rightward in FIG. The operating member 17 is moved by the compression coil spring 19 in FIG.
It is biased to the middle left.

In FIG. 9, a stop lever 27 is provided on the left side of the left rising wall portion 14a of the frame 14 so as to be rotatable about a shaft 28 as a fulcrum. This stop lever 27
As shown in FIG. 15, the base 27a, the base 27a
L-shaped arm 27b and base 2 provided on top of
Arm 27 provided at the middle of 7a and having a substantially U-shaped tip
c, and the U-shaped arm 27c is connected to the plunger 16a of the electromagnet 16. or,
This stop lever 27 is urged clockwise in FIG. 9 by a torsion coil spring 29 provided on a shaft 28.
Then, the other arm 27b of the stop lever 27 penetrates the left rising wall 14a of the frame 14 and comes into contact with the projection 18f of the sliding member 18, and by this contact, as shown in FIG. As shown, the rightward movement of the sliding member 18 is restricted.

In the upper right part of the main body case 1 in FIG.
A ZCT (zero-phase current transformer) 30 for detecting a leakage current flowing in the main circuit is provided, and a CT (current transformer) 31 for detecting an overcurrent flowing in the main circuit is provided. ing.

In the case of the above configuration, as described above, FIG.
0 and the state shown in FIG. 9 is a state where the main circuit is closed. That is, the plunger 16a of the electromagnet 16 is in a state of being attracted and held by the permanent magnet, and the arm 27b of the stop lever 27 contacts the projection 18f of the substrate 18a of the sliding member 18, whereby the sliding member 18 is restricted from moving to the right. In this state, since the operating member 17 is urged leftward in FIG. 10 by the compression coil spring 19, the right end of the catch receiver 12 is engaged with the engaging step portions 17 f and 17 g of the operating member 17, that is, The state where the main circuit is closed is maintained.

When the leakage current or overcurrent flowing through the main circuit is detected by the ZCT 30 or CT 31, the electromagnet 16 is energized by a control circuit (not shown), and the force for attracting and holding the plunger 16a is weakened. by this,
The force of the sliding member 18 moving rightward in FIG. 10 by the biasing force of the torsion coil spring 26 becomes greater than the force regulating the movement of the sliding member 18 by the plunger 16a, and the sliding member 18 moves in the same direction. Moving. Due to the movement of the sliding member 18, the convex portion 18h of the sliding member 18 abuts against the concave step 17h of the operating member 17 and presses it.
7 moves rightward in FIG. As a result, as shown in FIG. 11, the engagement between the right end portion of the catch receiver 12 and the engaging step portions 17f, 17g of the operating member 17 is released, and the catch receiver 12 is rotated clockwise, and And catch 10
Is rotated counterclockwise, the opening / closing mechanism 6 performs a breaking operation, and the main circuit is opened. In this case, the protruding piece 5a of the interlocking lever 5 is pushed up by the push-up surface 10a of the catch 10 rotated in the counterclockwise direction.
Is rotated clockwise about the fulcrum. The rotation of the interlocking lever 5 causes the rod 9 to move to the upright portion 18 of the sliding member 18.
At the time of i, the sliding member 18 is moved to the left. Thereby, the stop lever 27 is connected to the torsion coil spring 2.
9, the plunger 16a is moved in the direction to be sucked into the electromagnet 16 and returned to the sucked state.

On the other hand, when returning the above-mentioned main circuit interruption state to the closed state, the operation handle 4 is turned upward in FIG. As a result, the catch 10 is rotated clockwise in FIG. 10 to the original position, the shutoff operation of the opening / closing mechanism 6 is released, and the main circuit is closed. Also, with the return rotation of the catch 10, the catch receiver 12
a is pushed down by the push-down surface 10b of the catch 10 and is rotated in the counterclockwise direction.
9 is moved to the left by the urging force of the engaging step 17f, 1
The right end of the catch receiver 12 is engaged with 7 g. When the operation of the operation handle 4 is stopped, the catch 10 tries to return in the counterclockwise direction in FIG.
2 and held in this state. On the other hand, the interlocking lever 5 is also released from being pushed up by the pushing up surface 10a of the catch 10 and returned in the counterclockwise direction by the urging force of the torsion coil spring 8, so that the sliding member 18 is released from the regulation by the rod 9 and twisted. It is moved rightward by the urging force of the coil spring 26 so that the projection 18f comes into contact with the arm 27b of the stop lever 27, and returns to the state shown in FIG.

[0016]

In the above arrangement, the electromagnet 16 operates based on the detection of the leakage current or the overcurrent, and the operating member 17 is moved rightward in FIG. When the engagement of the catch 12 is released, the catch receiver 12 is jumped up by the catch 10 and rapidly rotated, and the right end collides with the board portion 17a of the operating member 17 and rebounds. When the catch receiver 12 rebounds above the engaging step portions 17f and 17g of the operating member 17 as shown in FIG.
As shown in FIG. 6, the actuating member 17 returns and its engaging step 1
7 f and 17 g are engaged with the catch receiver 12. Thus, in this case, even if the operating handle 4 is operated to return the cutoff state of the main circuit to the closed state, the catch 10 is brought into contact with the left end of the catch receiver 12 as shown by a two-dot chain line in FIG. Since the contact is prevented from further returning rotation, further operation cannot be performed, and the main circuit cannot be returned to the closed state. In this case, it is conceivable that the force of the torsion coil spring 8 is sufficiently increased and the stroke is increased so that the catch 10 moves beyond the left end of the catch receiver 12 via the interlocking lever 5. However, for this purpose, the force of the torsion coil spring 8 must be considerably increased, and as a result, the resistance force received by the torsion coil spring 8 when the catch 10 pushes up the interlocking lever 5 at the time of disconnection increases, and The adverse effects such as poor response are caused.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and therefore has as its object to prevent the trip member which operates upon detection of leakage current or overcurrent from engaging with the operation member even if the trip member rebounds. An object of the present invention is to provide an excellent earth leakage breaker that can perform a subsequent return operation as desired and can achieve the desired operation without deteriorating the responsiveness of interruption.

[Structure of the Invention]

[0019]

In order to achieve the above-mentioned object, a leakage breaker of the present invention, when detecting a leakage current or an overcurrent, activates an electromagnet to disengage a trip member by an operation member. Releasing, and performing a shutoff operation, wherein the lever of the opening / closing mechanism interlocking with the shutoff operation or a member further interlocking with the lever prevents the operation member from returning at the time of the shutoff operation. Features.

[0020]

According to the above means, the return of the operating member is prevented by the lever interlocking with the shutting operation of the opening / closing mechanism or the member further interlocking with the shutting operation during the shutoff operation. It does not come to engage with it.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

First, in FIGS. 1 to 5, the same parts as those in FIGS. 9 to 16 are denoted by the same reference numerals, and description thereof will be omitted. Thus, only those different parts will be described, which are in the operating member 41 and the interlocking lever 42. That is, the operating member 41 of the present embodiment
As shown in detail in FIG. 4, a board portion 41a corresponding to the board portion 17a of the conventional operating member 17, a rising wall portion 17
rising wall portions 41b and 41c corresponding to b and 17c, and falling wall portions 41b and 4 corresponding to falling wall portions 17d and 17e.
1e, engaging step 41 corresponding to engaging steps 17f, 17g
f, 41g, a concave step 41h (see FIGS. 1 and 2) corresponding to the concave step 17h, and a pair of substantially triangular projecting walls formed on the left upper surface of the substrate 41a. 4
1i, 41j, and a wall 41k connecting between the protruding walls 41i, 41j. On the other hand, the interlocking lever 42
As shown in FIG. 1 to FIG.
In addition to the projection 42a corresponding to the projection 5a, the projection 42a has a projection 42b on the opposite side (upper right side).

2, the plunger 16a of the electromagnet 16 is attracted and held by the permanent magnet, and the arm 27b of the stop lever 27 projects from the base 18a of the sliding member 18 when the main circuit is closed as shown in FIG. The movement of the sliding member 18 to the right is restricted by contact with the portion 18f. In this state, the operating member 41 is urged to the left in FIG. The state in which the right end of 12 is engaged with the engagement steps 41f and 41g of the operating member 41, that is, the state in which the main circuit is closed, is maintained.

On the other hand, when a leakage current or an overcurrent flowing in the main circuit is detected by the ZCT 30 or CT 31 (see FIG. 9), the electromagnet 16 is energized by a control circuit (not shown), and a force for attracting and holding the plunger 16a. Is weakened, the sliding member 18 is moved by the plunger 16a.
2, the force of the sliding member 18 moving rightward in FIG. 2 by the urging force of the torsion coil spring 26 becomes greater than the force regulated by the sliding member 18, and the sliding member 18 moves in the same direction. The convex portion 18h of the contact member comes into contact with and pushes the concave step portion 41h of the operating member 41. As a result, as shown in FIG. 1, the right end portion of the catch receiver 12 and the engagement step portions 41 f of the operating member 41,
The engagement with 41g is released, the catch receiver 12 is rotated clockwise, the catch 10 is subsequently rotated counterclockwise, the opening / closing mechanism 6 performs the shut-off operation, and the main circuit is opened. . In this case, the projecting piece 4 of the interlocking lever 42 is moved by the push-up surface 10a of the catch 10 rotated in the counterclockwise direction.
2a is pushed up, and the interlocking lever 42 is rotated clockwise about the shaft 7 as a fulcrum. By the rotation of the interlocking lever 42, the rod 9 hits the upright portion 18i of the sliding member 18 and moves the sliding member 18 to the left. Thereby, the stop lever 27 is moved to the torsion coil spring 29 (FIG. 9).
), The plunger 16a is moved in the direction to be sucked into the electromagnet 16 and returned to the sucked state.

Further, at this time, the interlocking lever 42 rotated clockwise about the shaft 7 as described above causes the protruding portion 42b to approach the protruding walls 41i and 41j of the operating member 41 in close proximity. Accordingly, at this time, the catch receiver 12 collides with the operating member 41, and as shown in FIG.
Even if the actuating member 41 bounces up to 41 g, the actuating member 41 does not return because it is blocked by the projection 42 b of the interlocking lever 42.
1 does not reach the point where the catch receiver 12 is engaged with the engaging step portions 41f and 41g, so that the catch receiver 12 is turned in the clockwise direction that is urged and settles to the state shown in FIG. Therefore, after this, if the operation handle 4 is operated to return the interrupted state of the main circuit to the closed state, the catch 10 rotates clockwise to the original position without being disturbed by the left end of the catch receiver 12. Thereby, the shutoff operation of the opening / closing mechanism 6 is released, and the main circuit is returned to the closed state.
Further, in this case, the force of the torsion coil spring 8 does not need to be increased more than necessary, so that the resistance force received by the torsion coil spring 8 when the catch 10 pushes the interlocking lever 42 at the time of disconnection can be kept small, and the response of the disconnection can be reduced. Property can be maintained favorably.

When the catch 10 returns as described above, the catch receiver 12 pushes the claw portion 12a down on the pressing surface 10b of the catch 10 to rotate in the counterclockwise direction, and the operating member 41 moves the catch member 12 in the counterclockwise direction. The return restriction by the compression coil spring 19 is released and the compression coil spring 19 is moved to the left by the urging force of the compression coil spring 19, so that the right ends of the catch receiver 12 are engaged with the engagement steps 41f and 41g. Then, when the operation of the operation handle 4 is stopped, the catch 10 tries to return in the counterclockwise direction in FIG. 2, but is received by the catch receiver 12, and is held in this state. On the other hand, the interlocking lever 42 also catches 1
Since the sliding member 18 is released from being pushed up by the push-up surface 10a and returned in the counterclockwise direction by the urging force of the torsion coil spring 8, the sliding member 18 is released from the regulation by the rod 9 and is pushed by the urging force of the torsion coil spring 26. It is moved rightward, and the projection 18f is brought into contact with the arm 27b of the stop lever 27, thereby returning to the state shown in FIG.

FIGS. 6 to 8 show different embodiments of the present invention. The main difference is that the interlocking lever 43 is the same as the conventional interlocking lever 5 and the same as the conventional operating member 17 except the projection 44i. An intermediate lever 45 having a convex portion 45a is rotatably supported by a shaft 46 between the operating member 44 and the convex portion 44i.

In this case, at the time of interruption, as shown in FIG. 7, the intermediary lever 45 is depressed by the interlocking lever 43 rotated clockwise by the catch 10 to rotate counterclockwise, and 45a is a convex portion 44i of the operating member 44.
To be close to. Therefore, at this time, catch catch 1
2 collides with the substrate portion 44a of the operating member 44 and rebounds over the engaging step portion 44f as shown in FIG.
4 is blocked by the convex portion 45a of the intermediate lever 45 and does not return, and the operating member 44 engages the catch receiver 12 with the engaging step portion 44f.
To engage. As described above, the reset operation can be desirably performed in the same manner as described above, and the effect that the responsiveness of the interruption can be maintained well can be obtained.

In this case, instead of the compression coil spring 19, the torsion coil spring 4
7, a biasing force in the left direction in the figure is given. The sliding member 48 has a protruding portion 48g projecting from the protruding portion 18g of the conventional sliding member 18, and the torsion coil spring 26
Is pressed against one end.

[0030]

As is evident from the above description, the earth leakage breaker of the present invention, when detecting an earth leakage current or an overcurrent,
An electromagnet is actuated to disengage the trip member by the actuating member and perform a breaking operation, wherein the opening / closing mechanism is operated by a lever interlocking with the breaking operation or a member further interlocking with the lever to perform the breaking operation. The return of the operating member is prevented, so that even if the trip member rebounds during the shut-off operation, it is possible to prevent the operating member from engaging with it. In addition, there is an excellent effect that the subsequent return operation can be performed as desired without being disturbed by the trip member, and can be achieved without deteriorating the response of interruption.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a main part in a trip state according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional side view of the same part in a normal state.

FIG. 3 is a front view of the same part in the same state.

FIG. 4 is a perspective view of a single operation member.

FIG. 5 is a side view of a longitudinal section in a state where a trip member is rebounded during a trip of a main part.

FIG. 6 is a view corresponding to FIG. 2, showing a different embodiment of the present invention.

FIG. 7 is a diagram corresponding to FIG. 1;

FIG. 8 is a diagram corresponding to FIG. 5;

FIG. 9 is an overall cutaway front view showing a conventional example.

FIG. 10 is a diagram corresponding to FIG. 2;

FIG. 11 is a diagram corresponding to FIG. 1;

FIG. 12 is a diagram corresponding to FIG. 4;

FIG. 13 is a perspective view of a single sliding member.

FIG. 14 is a perspective view showing a combined state of an operating member and a sliding member.

FIG. 15 is a perspective view of a lever alone.

FIG. 16 is a diagram corresponding to FIG. 5;

[Explanation of symbols]

6 is an opening / closing mechanism, 10 is a catch, 12 is a catch receiver (trip member), 16 is an electromagnet, 41 is an operating member, 4
Reference numerals 1i and 41j denote projecting walls, 42 denotes an interlocking lever, 42b denotes a projection, 43 denotes an interlocking lever, 44 denotes an operating member, 44i denotes a projection, 45 denotes an intermediate lever, and 45a denotes a projection.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01H 73/36 H01H 83/02

Claims (1)

(57) [Claims] An operating member that engages with a trip member of the opening / closing mechanism to prevent the opening / closing operation of the opening / closing mechanism, and, when a leakage current or an overcurrent is detected, activates an electromagnet to activate the electromagnet. A resettable earth leakage circuit breaker configured to release the engagement of the trip member and perform a breaking operation, comprising a lever interlocking with a breaking operation of the opening / closing mechanism of the earth leakage breaker. An earth leakage breaker, wherein the operation member is prevented from returning during operation.