JPH02227932A - Circuit breaker - Google Patents

Abstract

PURPOSE:To improve circuit breaking characteristics as well as to lessen actuating force at the time of resetting by providing a trip plate capable of being rotated, and thereby providing a holding lever locked by a catch. CONSTITUTION:A trip plate 31 is rotatably provided, and when a solenoid 38 is actuated based on eddy current, the trip plate 31 is rotated via a plunger 40 and an actuating lever 42 so that tripping is performed by a mechanism section 22. In addition, a holding lever 32 locked by a catch 23 is provided so that the plunger 40 is restored to its original position by means of energizing force of a reset body 44 when restriction by the catch 23 is released at the time of tripping. By this constitution, circuit breaking characteristics are improved, and actuating force at the time of resetting can thereby be lessened markedly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a circuit breaker that operates an electromagnetic solenoid to interrupt a circuit based on detection of overcurrent.

(Prior Art) A conventional circuit breaker of this type is shown in FIGS. 7 and 8. That is, 1 is an electromagnetic solenoid, which is installed in the frame 2, and normally holds the plunger 3 in an attracted state by an internal permanent magnet. 4 is a lever, which is attached to a pin 5 attached to the frame 2 in the center.
The plunger 3 is rotatably supported by the plunger 3, and one end 4a is engaged with the pin 3a of the plunger 3. Reference numeral 6 denotes a spring stretched between the frame 2 and the lever 4, which urges the plunger 3 to protrude in the direction of arrow A. Reference numeral 7 denotes a slide plate, whose elongated holes 7a and 7a are fitted with pins 8.8 attached to the frame 2, respectively, so that it can slide in the direction of the arrow and in the direction opposite to the arrow, and is always in the position of the spring. 9, it is biased in the opposite direction of the arrow. 10 is an engagement hole formed in the slide plate 7, into which the other end 4b of the lever 4 is engaged. When the other end 4b of the lever 4 is engaged with the engagement hole 10, the slide plate 7 is prevented from moving in the opposite direction of the arrow, and when the lever 4 is rotated in the direction of the arrow B, the other end When the engagement between the portion 4b and the engagement hole 10 is released, it is possible to move in the opposite direction of the arrow. Although not shown, the end portion 7b of the slide plate 7 is removably engaged with a trip plate of a mechanism section for opening and tripping the opening/closing section.
When engaged, the trip plate prevents the latch from rotating,
When the latch is released, the blocking by the trip plate is released to allow rotation of the latch.

When an overcurrent flows through such a circuit breaker, the circuit section detects this and the electromagnetic solenoid 1 is energized. Then, the electromagnetic force of the electromagnetic solenoid 1 cancels the attractive force of the permanent magnet, and the plunger 3 is projected in the direction of arrow A by the urging force of the spring 6. As a result, the lever 4 is rotated in the direction of arrow B and disengaged from the engagement hole 10, and the slide plate 7 is slid in the direction of arrow A opposite to the direction of arrow A by the elastic force of the spring 6. The engagement between the end portion 7b and the trip plate is released and the latch rotates. Then, the engagement between the latch (not shown) and the catch receiver is released, the mechanism section rotates in the trip direction, and the opening/closing section is tripped.

When resetting this circuit breaker, when the handle (not shown) is rotated in the reset direction, the mechanism section is rotated in the opposite direction to that described above, and at the same time, the return lever (not shown) engages with the lever 4. Rotate the lever 4 in the opposite direction of arrow B. Then, the lever 4 moves the plunger 3 to the spring 6.
The slide plate 7 is moved in the direction opposite to the arrow A against the elastic force of the spring 9, and the electromagnetic solenoid 1 is rejuvenated. Other end 4
b is engaged with the engagement hole 10 and returned to the original position. As a result, the end 7b of the slide plate 7 is engaged with the trip plate, the latch is engaged with the catch receiver, the latch and the catch receiver are locked unrotatably, and the machine IAj section is returned to its initial state. .

(Problems to be Solved by the Invention) However, in the above-described configuration, when the opening/closing section is tripped, the plunger 3. Lever 4. Slide plate 7 and trip plate 4
It is necessary to operate the parts, and there are problems in that the operating time until the opening/closing part is tripped is long (1) and the interrupting characteristics are poor. Further, when resetting the handle, the lever 4 and the slide plate 7 must be moved against the elastic forces of the springs 6 and 9, respectively, so there is a problem in that the operating force is large. Moreover, electromagnetic solenoid 1
In order to return the plunger 3 to its original position, the slide plate 7. It is necessary to move the lever 4 and the plunger 3, and in addition, the stroke of the mechanism part at the time of tripping is also involved, making it troublesome to adjust the stroke of the parts.

The present invention has been made in view of the above circumstances, and its purpose is to provide a circuit breaker that can improve the interrupting characteristics, reduce the operating force at the time of resetting, and simplify the stroke adjustment of components. It is to provide the equipment.

[Structure of the Invention] (Means for Solving the Problems) The circuit breaker of the present invention includes a catch and a latch for restricting rotation of the catch in the trip direction, so that rotation restriction of the catch is released. A) A mechanism part is provided that causes the opening/closing part to perform a trip operation when the switch is activated, and an electromagnetic solenoid that is energized based on the overcurrent and operates the plunger is provided. An operating lever is provided that is rotated, and is normally held at its original position and engaged with the latch, and is rotated in response to the rotation of the operating lever to release the engagement, thereby regulating the rotation of the catch. A trip plate is provided to release the plunger, and a reset body is provided which is normally applied with a biasing force in a direction to return the plunger, and the reset body is latched to the catch in the rotation restricted state to resist the biasing force. It is characterized by the provision of a holding lever which is held so as to be spaced apart from the plunger and which releases the holding when the rotational control of the catch is released.

(Function) According to the circuit breaker of the present invention, when an overcurrent flows, the electromagnetic solenoid is energized based on this, and the plunger is activated. The operation of the plunger rotates the operating lever that engages with the plunger, further rotates the trip plate, and releases the engagement between the trip plate and the latch. As a result, the latch is rotated and the restriction on rotation of the catch is released, so the catch is rotated in the tripping direction, the mechanism section performs a tripping operation, and the opening/closing section is tripped.

Further, when the rotation restriction of the catch is released, the holding lever releases the holding of the reset body, and the reset body uses its biasing force to move the plunger in the direction of the electromagnetic solenoid and return it to the original position.

When resetting the mechanism, when the catch is rotated in the reset direction and engaged with the holding lever, the holding lever moves the reset body away from the plunger against the biasing force, and the catch engages with the latch. When the diurnal movement is regulated, the reset body is returned to its original position.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 6.

First, in FIG. 6 showing an outline of the overall configuration, 11 is a case body, which is a case 12 made of an insulating material.
and a cover 1 attached to the top opening of this case 12.
3, and a fixed contact 14 is disposed at one end of the case 12. 15 is the case body 11
A crossbar made of an insulating material is rotatably supported by a crossbar, and a movable contact 16 is attached to this crossbar, and the movable contact 16 and the fixed contact 14 constitute an opening/closing part 17. 18 is a flexible conductor attached to the movable contactor 16;
This is connected to a load terminal 19 provided at the other end of the case 12. 20 is an arc extinguishing device provided covering the movable contact 16 and the fixed contact 14. Reference numeral 21 denotes a handle, and a handle receiver 21a attached to the body is supported by the case 12 so as to be able to swing in the direction of arrow C and the direction opposite to arrow C.
It penetrates and protrudes outward. 22 is a mechanism section, which is a catch 23. Top link 24. Lower link 25, catch receiver 26. It is composed of a toggle spring 27 and a latch 28 (see FIG. 5). Of these, Catch 23
In this case, a locking piece 23a protruding from one end is connected to the catch receiver 2.
6, and when engaged, its rotation is restricted, and when the engagement is released, it can be rotated II.

Next, in FIG. 5, the latch 28 is rotatably attached to the first frame 29 via a pin 30,
One end portion removably engages with the catch receiver 26 (not shown), restricts rotation of the catch receiver 26 when engaged, and allows rotation when disengaged. A locking portion 28a of the latch 28 is removably locked to a trip plate 31, which will be described later, so that its rotation is restricted. Note that one end of the upper link 24 is held by the catch 23 by the bin 24a.
The other end is rotatably connected to one end of the lower link 25 by a pin 24b. The other end of this lower link 25 is connected to a pin 15a provided on the cross bar 15, and also has a toggle spring 27.
The spring holder of the handle holder 21a is connected to the portion 21c and the pin 24.
The hook is passed between b and b. Reference numeral 32 denotes a maintenance lever, which is rotatably attached to the first frame 29 via a pin 33, and is always supported by a spring 34 (this can be provided as necessary; it is not a weak spring force). ), and when the catch 23 is engaged with the catch receiver 26, the end portion 32g comes into contact with the catch 23 and rotation in the direction of the arrow is restricted. 35 is a current detection section, which detects the current flowing through the load. Reference numeral 36 denotes a circuit section which calculates the current detected by the current detection section 35 and issues a signal to the drive circuit of the tripping device 37 in the event of an overcurrent.

The trip device ffi'37 will be explained below with reference to FIGS. 1 to 4.

Reference numeral 38 denotes an electromagnetic solenoid, which is attached to a second frame 39 attached to the cover 13, and normally holds the plunger 40 in its original position with an internal permanent magnet (not shown). Reference numeral 41 denotes a spring that biases the plunger 40 in the direction of separating it from the electromagnetic solenoid 38, that is, in the direction of arrow E. 42 is an actuation lever, which is connected to a pin 43 attached to the second frame 39 in the center.
An engaging portion 42a at one end is engaged with a pin 40a of the plunger 40, and a protrusion 42b is formed at the other end. Reference numeral 44 denotes a reset body, which is composed of a slide plate 45 and a reset plate 46 integrally coupled with this slide plate 45. Of these, the slide plate 45 has an L-shape, and long holes 45b, 45b formed in the base 45a are connected to the second frame 3, respectively.
9 is fitted with the pin 47.47 attached to the arrow F.
It is made to be able to slide in the direction of arrow F and in the opposite direction of arrow F, and is always moved in the direction of arrow F (the opposite direction of arrow E) by a spring 48.
The contact piece 45d at the end of the bent portion 45c bent at a substantially right angle from the base portion 45a faces the plunger 40. The reset plate 46 is L-shaped,
The base portion 46a is coupled to the bent portion 45c of the slide plate 45, and the bent portion 46b protrudes toward the mechanism portion 22 side. An engaging portion 49 with one end open is formed in the bent portion 46b, and a bottle 50 attached to the end of the holding lever 32 is removably inserted into the engaging portion 49. pin 5
0 is always in contact with one end edge 49b. The trip plate 31 described above is rotatably attached to the third frame 51 attached to the cover 13 via a pin 52, and the end portion 31a faces the convex portion 42b of the lever 42. A spring 53 is hung between the trip plate 31 and the third frame 51 to hold the trip plate 31 in its original position. In this original position, the end portion 31a of the trip plate 31 faces the convex portion 42b of the lever 42, and the locking portion 31b locks with the locking portion 28a of the latch 28, so that the latch 28. The catch receiver 26 and the catch 23 are restricted to be unrotatable.

Next, the operation of the above configuration will be explained.

In the normal ON state shown in FIG. 6 in which the handle 21 is rotated in the direction of arrow C, the electromagnetic solenoid 38 sucks the plunger 40 against the elastic force of the spring 41, and the trip plate 31 53, the locking portion 31b of the trip plate 31 is held in the original position by the urging force of the latch 2.
8, the latch 28 is locked to the catch receiver 26, and the catch receiver 26 is locked to the locking piece 23a of the catch 23. Therefore, above link 24
is rotated in the direction of the arrow G by the spring force of the toggle spring 27, and the upper link 24 and lower link 25 rotate the crossbar 15 and the movable contact 16 in the direction of the arrow H, so that the movable contact 16 becomes a fixed contact. 14 to close the opening/closing part 17.

In this state, when the handle 21 is rotated in the opposite direction of arrow C to the off position, the handle 21 moves, that is, the spring receiver of the handle receiver 21a moves, and the spring receiver moves between the section 21c and the bottle. The line connecting 24b is bin 24
a to the locking piece 23a side of the catch 23, the toggle spring 27 biases the upper link 24 to rotate in the direction opposite to the arrow G, thereby causing the upper link 24 to move in the direction opposite to the arrow G. is rotated to rotate the cross spar 15 and the movable contact 16 in the opposite direction of arrow H via the lower link 25,
The movable contact 16 is separated from the fixed contact 14, and the opening/closing part 1
7 is released.

Now, when an overcurrent flows through the load in the normal ON state shown in FIGS. 1, 2, and 6, the current detection section 35 detects this, and the circuit section 36 determines whether the overcurrent is present by calculation. and sends a signal to the drive path of the tripping device 37. As a result, the electromagnetic solenoid 38 is energized, and the magnetic force of the electromagnetic solenoid 38 cancels the electromagnetic force of the permanent magnet, so that the attraction force on the plunger 40 disappears, and the plunger 40 protrudes in the direction of arrow E due to the elastic force of the spring 41. Then, it comes into contact with the contact piece 45d of the reset body 44 and stops. As the plunger 40 operates, the operating lever 42 that engages with the pin 40a is rotated in the direction of the arrow, and the convex portion 42b rotates the end 31a of the trip plate 31 against the elastic force of the spring 53. let As a result, the locking portion 31 of the trip plate 31
b is disengaged from the locking portion 28a of the latch 28. - Sochi 28 is the arrow! direction, the engagement between the catch 23 and the catch receiver 26 is released, and the catch receiver 26 is rotated to release the engagement between the catch 23 and the locking piece 23a. As a result, the gear notch 23 is connected to the toggle spring 2.
7 is rotated in the direction of arrow G in the trip direction, and when the bottle 24a crosses the line connecting the spring receiving part 21c and the bottle 24b to the right side, the cross I is rotated in the same manner as described above.
<-15 and the movable contact 16 are rotated in the direction opposite to the arrow H via the lower link 25 by the elastic force of the toggle spring 27, causing the crossbar 15 and the movable contact 16 to be rotated in the direction opposite to the arrow H, The movable contact 16 is separated from the fixed contact 14, and the opening/closing portion 17 is opened. Further, the handle 21 is rotated in the opposite direction of arrow C and stopped at the tri-butt position.

On the other hand, when the catch 23 is rotated in the direction of the arrow G, the holding lever 32 is rotated in the direction of the arrow G by the biasing force of the spring 34, and the bottle 50 is rotated in the other end edge 49b of the engaging portion 49 of the reset body 44. Move to the side. Then, the reset body 44, that is, the slide plate 45 is moved in the direction of arrow F by the elastic force of the spring 48, and the abutting piece 45d of the reset body 44 is moved against the plunger 4.
0 is moved in the opposite direction of the arrow E against the elastic force of the spring 41 and returned to the original position where it is attracted by the permanent magnet of the electromagnetic solenoid 38. Then, the operating lever 42 that engages with the pin 40a of the plunger 40 is rotated in the direction opposite to the arrow and returns to its original position, and the trip plate 31 is also returned to its original position by the elastic force of the spring 53. The locking portion 31b locks on the locking portion 28a of the latch 28.

Next, when the handle 21 is rotated to the helical reset position in the direction opposite to arrow C in order to reset from the above-mentioned trip position, the catch 23 is rotated in the direction opposite to arrow G, and the locking piece 2
3a engages with catch receiver 26, and catch receiver 26 engages with latch 28. On the other hand, catch 23 is anti-arrow G
When the holding lever 32 is rotated in the opposite direction by the catch 23, the bottle 50 is moved into the engaging portion 4.
9, the reset plate 46, that is, the reset plate I
- Move the body 44 in the opposite direction of arrow F against the elastic force of the spring 48. Then, the person in charge 11 and the two pieces 23a are connected to the catch receiver 2.
6, the contact piece 45d is returned to its original position away from the plunger 40.

According to the above embodiment, the following effects are achieved. That is, the trip plate 31 is rotatably provided; when the electromagnetic solenoid 38 is energized and activated based on the A current, the trip plate 31 is rotated via the plunger 40 and the operating lever 42;
Since the mechanism section 22 is made to perform the trip operation, when tripping the opening/closing section 17, the three components of the plunger 401, the operating lever 42, and the trip plate 31 are operated before the latch 28 of the mechanism section 22 is rotated. Compared to the conventional method in which four parts had to be operated, the operation time is significantly shortened and the interrupting characteristics can be improved. In addition, a holding lever 32 is provided that is locked to the catch 23, and when the holding lever 32 is released from rotation restriction by the catch 23 when tripped due to overcurrent, the reset body 44
Since the plunger 40 is returned to its original position by the biasing force of the spring 48, the only operating force required for resetting is the operating force that returns the reset body 44 to its original position against the elastic force of the spring 48. Spring 9. The operating force can be reduced compared to the conventional method in which the plunger 3 has to be moved against the resilient force of the spring 6 and then returned against the resilient force of the spring 6. Moreover, as described above, since the plunger 40 is returned to its original position by the reset body 44 at the time of tripping, it has no relation to the stroke of the mechanism section 22 at the time of the reset operation, and therefore the relationship with the stroke of the mechanism section 22 at the time of tripping. This makes it easier to adjust the stroke of parts.

In the above embodiment, the latch 28 and the catch receiver 26 are formed separately, but they may be formed integrally.

[Effects of the Invention] As is clear from the above description, the circuit breaker of the present invention includes a catch and a latch for restricting the rotation of the catch in the trip direction, so that the rotation restriction of the catch is released. A mechanism part is provided to cause the opening/closing part to perform a trip operation, an electromagnetic solenoid is provided to actuate the plunger, and an actuation lever is provided which is engaged with the plunger of the electromagnetic solenoid and is rotated by the operation of the plunger. A trip plate is provided which is held in the original position and latched to the latch, and is rotated in response to rotation of the operating lever to release the latching, thereby releasing the restriction on rotation of the catch. A reset body is provided to which a biasing force is applied in the direction of returning the rotation of the catch, and the reset body is held so as to be held away from the plunger against the biasing force when the catch is in the rotation restricted state. Since a holding lever is provided that releases the holding when the rotation restriction is released, the blocking characteristics can be improved.
It is possible to reduce the operating force when resetting, and
Stroke of parts: This has the effect of simplifying J3 alignment.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention, in which FIG. 1 is a plan view of the tripping device, FIG. 2 is a side view of the same, and FIG. 3 is a perspective view of the second frame. Fig. 4 is a diagonal bowl view of the reset body, Fig. 5 is a front view of the main parts, Fig. 6 is a longitudinal sectional front view of the whole, Fig. 7 is a view equivalent to the conventional Fig. 1, and Fig. 8 is a front view of the main part. 7 is a sectional view taken along the line ■-■ in FIG. 7. FIG. In the figure, 17 is an opening/closing part, 22 is a mechanism part, 23 is a catch,
28 is a latch, 31 is a trip plate, 32 is a holding lever
38 is an electromagnetic solenoid, 40 is a plunger, 42 is an operating lever, and 44 is a reset body. Applicant Toshiba Kon Co., Ltd. Figure 2 Σ Figure 1 Figure 1

Claims (1)

[Claims] 1. A catch and a mechanism section that includes a latch for regulating the rotation of the catch in the tripping direction and causes the opening/closing part to perform a trip operation when the rotation restriction of the catch is released, and an electromagnetic solenoid that is energized to operate the plunger; an operating lever that is engaged with the plunger of the electromagnetic solenoid and rotated by the operation of the plunger; a trip plate that is rotated in response to the rotation of the trigger to release the lock and thereby release the restriction on rotation of the catch; and a reset body that is normally applied with a biasing force in the direction of returning the plunger. a holding lever that is locked to the catch in the rotation restricted state and holds the reset body so as to be separated from the plunger against the biasing force thereof, and releases the holding when the rotation restriction of the catch is released; It is equipped with a circuit disconnector.