JPS6367729B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to miniature circuit breakers, commonly referred to as circuit protectors.

Conventionally, this type of circuit disconnector uses a suction type electromagnetic device that attracts the armature with magnetism generated by a current flowing through a coil to trip the opening/closing mechanism, or a suction type electromagnetic device that attracts the amateur with the magnetism generated by the current flowing through the coil, or the heat generated by the current flowing through the heater wire. A thermal device was used to deform the bimetal, but
In order to reduce the operating current and operating voltage, in the case of the former attraction type electromagnetic device, the operating current can be reduced by increasing the number of turns of the coil, but since the resistance of the coil increases, the operating voltage increases and both are satisfied. In order to do this, it tends to be large, and the latter type of thermal device requires generation of enough heat to deform the bimetal, so it has been difficult to satisfy both requirements.

In view of the above-mentioned points, the present invention aims at making it possible to reduce the operating current and operating voltage by using an open-circuit electromagnetic device.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. 1 to 6, which illustrate one embodiment of the present invention. Reference numeral 1 denotes a body of an overcurrent relay, in which a pair of one-opening covers 2 are arranged front and back, and are composed of a side plate 2a, upper and lower plates 2b and 2c formed on the upper and lower left and right sides of this side plate 2a, and left and right side plates 2d and 2e. and combine. Therefore, a space 1a is formed inside this container body 1. The rivets 3 are used as connectors for holding the covers 2 together, and are inserted into holes 2f formed at the four corners of the top, bottom, left and right of the side plate 2a of the cover 2. Of course,
A screw may be used instead of the stud 3. Reference numeral 4 designates a mounting fixture for this overcurrent relay, which includes both front and rear end pieces 4a, 4b having holes 5a, 5b through which the studs 3 are inserted, and a screw hole 6 for a mounting screw connecting the upper ends of these end pieces 4a, 4b. The connecting piece 4c is formed into a U-shape with a connecting piece 4c formed in the upper plate 2b of the container body 1, and the connecting piece 4c is fitted and positioned in the groove 7a formed in the upper plate 2b of the container body 1. 7b, 7b
Temporarily fix the cover 2 so that it does not come apart by fitting the end pieces 4a and 4b into the holes 5a and 5b of the end pieces 4a and 4b and the hole 2f formed in the cover 2 with the upper left and right studs 3. It is installed by inserting it.

The opening/closing mechanism section A is housed on the right side of the space 1a of the container body 1, and the release type electromagnetic device B is housed on the left side of the space 1a. First, to explain the opening/closing mechanism part A, 8 is a holding plate installed inside the container body 1, and is made up of a vertical board 8a and a side plate 8b formed by bending the front and rear sides of the vertical board 8a to the right. , side plate 8
The projecting piece 8c at the lower end of the cover 2 is fitted into the recessed receiving part 2g formed at the center of the lower end of the side plate 2a of the cover 2, and inserted through the hole 9 formed at the upper end of the side plate 8b.
Both ends of the handle pin 10 bridged between the cover 2
It is fixed to the vessel body 1 by fitting into a hole receiving portion 2h formed at the center of the upper end of the side plate 2a. Reference numeral 11 denotes a handle, which is centrally supported by the aforementioned handle pin 10, one end of which is an operating end 11a that protrudes from a window hole 1b formed in the upper plate 2b of the container body 1, and the other end is a fork-shaped cam end 11b. It is becoming. 12 is a hole through which the handle pin 10 formed on the handle 11 is inserted. 13 is a trip link whose upper end 13a fits into the cam end 11b of the handle 11, and the support shaft 14
At this point, both 13a and 11b are rotatably connected.
15 is a hole formed in the cam portion 11b of the handle 11 through which the support shaft 14 is inserted; 16 is a drip link 13;
This is a hole through which a support shaft 14 is inserted, which is formed at the upper end 13a of the holder. Reference numeral 17 denotes a return spring for the handle 11, which holds the handle pin 10 by inserting it into the winding part 17a, and connects one end 17b of the winding part 17a to the side plate 8b of the holding plate 8.
and the other end 17c is hooked on the support shaft 14 to impart a counterclockwise spring force to the handle 11. 18 is a link, front and rear side plates 18a,
18b and a connecting plate 18c that connects the upper right sides of the front and rear side plates 18a and 18b, and this side plate 1
Trip link 1 is attached to the upper end 18d between 8a and 18b.
Insert the lower end 13d of 3 and tighten the rivets 19 to both 18
d and 13b are rotatably connected. 20 is a hole formed in the link 18 through which the stud 19 is inserted, and 21 is a hole formed in the trip link 13 through which the stud 19 communicates. Therefore, the trip link 13 rotates around the stud 19, and during this rotation, the clockwise rotation is caused by the stopper piece 13c formed between the upper end 13a and the lower end 13b of the trip link 13 and the connecting plate 18c of the link 18. It will stop at the position where it touches. Reference numeral 22 is a trip lever, which includes a lever portion 22a and a lever portion 22.
A shaft portion 22b is fixed to one end of the shaft portion a, and a cutout portion 22c having a semicircular shaft cross section is formed in the center of the shaft portion 22b. Furthermore, this shaft portion 22b
is inserted into a hole 23 formed at the upper left end of the link 18, and an E-shaped retaining ring 24 is fitted to the end of the shaft portion 22b to prevent it from coming off. Reference numeral 25 denotes a trip lever spring spring, which inserts and holds the shaft portion 22b of the trip lever 22 into the wound portion 25a, and connects one end 25b of the wound portion 25a to the side plate 18 of the link 18.
a, and the other end 25c is hooked on the lever portion 22a of the trip lever 22 to apply a clockwise spring force to the trip lever 22 around the shaft portion 22b. 18f is the side plate 18a of the link 18
This is a hook piece for the trip lever spring spring 25 formed in the figure. Therefore, the lever portion 22a of the trip lever 22 engages the hooking piece 18d formed on the link 18.
When the trip link 13 is close to the shaft 22b of the trip lever 22, the hook piece 13d formed at the left end of the trip link 13 is hooked to the rivet 19.
The rotation of the trip link 13 about the center is stopped in both the clockwise and counterclockwise directions, and when the trip lever 22 rotates counterclockwise, the hook 13d of the trip link 13 engages with the notch 22c of the trip lever 22. This allows the fitting and rotation of the trip link 13 to be performed.
26 is a movable contact, 27 is a movable contact plate with the movable contact 26 fixed at the right end, and this center is connected to link 1.
A stud 28 fitted into the lower end 18e between the side plates 18a and 18b of No. 8 rotatably connects both sides. 29
30 is a hole formed in the side plates 18a, 18b of the link 18, through which the stud 28 is inserted, and 30 is a hole formed in the movable contact plate 27, through which the stud 28 is inserted. The point of this hole 30 becomes the point of action of the opening/closing operation. 31
is a long hole formed at the left end of the movable contact plate 27, and 32 is a support shaft that passes through this long hole 31. Both ends of this support shaft 32 are inserted into holes 33 formed at the lower end of the side plate 8b of the holding plate 8. Thus, the movable contact plate 27 is pivotally supported on the holding plate 8. Reference numeral 34 is an opening spring, and coil spring parts 34a and 3 have a support shaft 32 inserted between the side plate 8b of the holding plate and the movable contact plate 27.
4b and the acting part 3 hooked on the movable contact plate 27 connecting the opposing ends of the coil springs 34a and 34b.
4c and hooking pieces 34d, 34 formed at the other ends of the coil spring parts 34a, 34b to the side plate 8b of the retaining plate 8.
e, and these hook pieces 34d and 34e are attached to the side plate 8.
Key piece 8 formed by bending the lower ends of b inward
d to apply a counterclockwise spring force to the movable contact plate 27.

Therefore, the coil spring 34a of this opening spring 34,
At 34b, the movable contact plate 27 is connected to the side plate 8b of the holding plate 8.
It is positioned without wobbling in between.
35 is a fixed contact that separates from the movable contact 26; 36 is an inverted L-shaped terminal plate with the fixed contact 35 fixed at one end; do. Reference numeral 38 is a tripping plate, and a support piece 38 is formed by bending an inverted T-shaped vertical board 38a and the lower front and rear sides of this vertical board 38a to the right.
b, a tripping piece 38c formed by bending the central front side of the vertical board 38a to the right, and a narrow protrusion 38d formed at the upper end of the vertical board 38a,
The support plate 38a is fitted with the side plate 8b of the holding plate 8, and the movable contact plate 27 is rotatably mounted on the supporting shaft 32, and the vertical board 38a is positioned on the right side of the vertical board 8a of the holding plate 8. . Therefore, the tripping plate 3
The counterclockwise rotation of the movable contact plate 27 is stopped when the vertical base plate 38a comes into contact with the vertical base plate 8a of the holding plate 8, and the counterclockwise rotation of the movable contact plate 27 is stopped when the vertical base plate 38a of the tripping plate 38 is stopped by a movable contact on the vertical base plate 38a of the tripping plate 38. It stops when the upper left end of the plate 27 comes into contact with it. Reference numeral 39 represents a contact surface with which the movable contact plate 27 contacts, and reference numeral 40 represents a hole formed in the support piece 38b of the tripping plate 38 through which the support shaft 32 is inserted. Reference numeral 41 denotes an inverted L-shaped terminal plate, which is fitted and fixed into a groove formed at the left end of the lower plate 2c of the container body 1, and is connected to the movable contact plate 27 by a braided wire 43.

Next, to explain the release type electromagnetic device B, 44 is a magnet that generates magnetic flux in the horizontal direction, 45 is a U-shaped yoke, and 46 is a coil frame. The yoke 45 is protruded and placed inside the coil frame 46, and the magnet 44 is placed near the lower right end of the yoke 45 and placed inside the coil frame 46.
A coil 47 is wound around the coil 47 and is located between the upper end of the yoke 45 and the magnet 44. The magnetic flux generated in the coil 47 cancels the magnetic flux of the magnet 44. 48 is a terminal of this coil 47. 49 is yoke 45
A vertical armature bridging both ends of the
The magnetic flux of the magnet 44 is attracted by passing through the yoke 45 and the armature 49. Reference numeral 50 denotes a spring installed in the upper part of the coil frame 46 by contracting it in the left-right direction, and 51 is an output lever installed inside the spring 50 and movable in the left-right direction, with a hole bored in the center. The upper end of armature 49 is fitted into 52. Therefore, this output lever 51 is connected to the spring 50.
Force is applied in the rightward extrusion direction, but
Amateur 49 is yoke 45 by the magnetic flux of magnet 44.
Since the output lever 51 is attracted to both ends of the output lever 51, the output lever 51 is not pushed out to the right but is held at the left position. 53 is a box body from which the tip of the terminal 48 and the right end 51a of the output lever 51 protrude;
5, coil frame 46, coil 47, amateur 4
9. Surround the spring 50, etc. Therefore, this box body 53
are the front and rear side plates 2a, 2a and the upper and lower plates 2b, 2 of the vessel body 1.
c is positioned within the container body 1 by the left side plate 2d and the vertical substrate 8a of the holding plate 8. Further, a hole 54 is formed at the right end 51a of the output lever 51, and this hole 54
The protrusion 38d of the tripping plate 38 of the opening/closing mechanism section A is fitted into and engaged with the opening/closing mechanism section A. 55 and 56 are inverted L-shaped terminal plates facing each other, and are connected to the terminal 48 by a lead wire 57. Reference numeral 58 denotes a pair of holders for fitting and fixing the terminal plates 55 and 56 into the grooves 59 and 60, respectively, which are fitted and fixed in a hole 61 formed in the center of the lower plate 2c of the container body 1.

To explain the operating state of this circuit and disconnector, FIGS. The support shaft 32 is separated from the fixed contact 35 and is pressed toward the lower end of the elongated hole 31 . Moreover, the rotation of the movable contact plate 27 is stopped when the left end of the movable contact plate 27 comes into contact with the vertical base plate 38a of the tripping plate 38, which is in contact with the vertical base plate 8a of the holding plate 8. Further, the operating end 11a of the handle 11 is tilted to the left, and the cam end 11b pulls up the upper end 13a of the trip link 13.
The lower end 13b of the trip link 13 pulls up the upper end 18d of the link 18, and the stopper piece 13 of the trip link 13
c and the connecting plate 18c of the link 18 are in contact with each other, and since the trip lever 22 is applied with a clockwise spring force by the trip lever spring spring 25, the hooking piece 13d of the trip link 13 is attached to the shaft portion 22b of the trip lever 22. is in a state of being caught. Furthermore, in the release type electromagnetic device B, the output lever 51 is given a force in the rightward pushing direction by the spring 50, but since the armature 49 is attracted to both ends of the yoke 45 by the magnetic flux of the magnet 44, the output lever 51 is output. The lever 51 is not pushed out to the right but is held at the left position. At this time, even if current is applied to the coil 47 to cancel the magnetic flux of the magnet 44, the output lever 51 will remain in the left position because a counterclockwise force is applied to the tripping plate 38 by the spring force of the opening spring 34. Maintain the state held at .

Further, when the handle 11 is tilted to the right from this open state, this cam portion 11b is moved to the trip link 13.
By pushing down the upper end 13a, the hooking piece 13d of the trip link 13 is hooked on the shaft portion 22b of the trip lever 22, so the trip link 13
The lower end 13b pushes down the upper end 18d of the link 18, and this lower end 18e pushes down the movable contact plate 27, causing it to rotate about the support shaft 32. The movable contact plate 27 rotates, and the movable contact 26 connects to the fixed contact 3.
5, the left end of the movable contact plate 27 is pushed down around this contact point, and the support shaft 32 moves within the elongated hole 31, and the spring force of the return spring 34 causes the contact 2 to
Contact pressure is applied to contacts 6 and 35. At this time, trip link 13 and stud 19
A counterclockwise rotational force is applied around link 1.
8 is stopped in the closed state as shown in FIGS. 5a and 5b by applying a clockwise rotational force around this stud 19. That is, the support shaft 14 is on the left side of the straight line X connecting the handle pin 10 and the nail stud 28, and the nail stud 19
is located on the right side, and the rotation of the handle 11 is also stopped by the rotational force of the trip link 13. Therefore, in this closed state, the trip lever 22
The lever portion 22a of the tripping plate 38 of the tripping plate 38
Opposite c. That is, the lever portion 22a is located on the right side of the tripping plate 38c. Further rotation of the movable contact plate 27 causes the upper left end of the movable contact plate 27 to separate from the tripping plate 38, and the rotation of the tripping plate 38 follows the operation of the output lever 51 of the release type electromagnetic device B. .

However, when a current flows through the coil 47 of the open-circuit electromagnetic device B in this closed state, the magnetic flux of the magnet 44 generated through the upper end of the yoke 45 is canceled and weakened, and the armature 49 is released from the upper end of the yoke 45. Leave. At this time, the magnetic flux of the magnet 44 generated via the lower end of the yoke 45 is not struck, so the armature 49
rotates around the lower end of this yoke 45. Due to this rotation of the armature, the output lever 51 is moved to the right by the force of the spring 50.
The tripping plate 38 is rotated clockwise, and the tripping piece 38c of the tripping plate 38 pushes the lever portion 22a of the trip lever 22 to rotate the shaft 22b. Along with this, the hook piece 1 of the trip link 13
3 becomes unlatched and the trip link 13 rotates counterclockwise, resulting in a tripping state as shown in FIGS. 6a and 6b. Furthermore, the handle spring spring 17
At this point, the handle 11 is reversed to the left, and the movable contact plate 27 is rotated counterclockwise by the return spring, and with this rotation, the upper left end of the movable contact plate 27 comes into contact with the tripping plate 38, and the tripping plate is removed. 38 in the counterclockwise direction, the tripping plate 38 moves the output lever of the release type electromagnetic device B to the left, and the armatures 49 are brought into contact with both ends of the yoke 45 and attracted by the magnets 44, as shown in FIG. The state returns to the open state of a and b.

As described above, the present invention includes the raising/lowering handle 11, the trip link 13 whose one end 13a is rotatably connected to the cam end 11b of the handle 11, and the link 18 whose one end 18d is rotatably connected to the other end 13b of the trip link 13. , a movable contact plate 27 whose center is rotatably connected to the other end 18e of the link 18 and which rotates a movable contact 25 fixed to the other end using one end as a fulcrum; Spring 34 that applies force to open
, a trip lever 22 that engages and controls the rotation between the trip link 13 and the link 18 in a freely engageable and disengageable manner, a tripping piece 38c that operates the trip lever 22, and a contact surface 39 that comes into contact with the movable contact plate 27 when it is opened. The opening/closing mechanism part A comprises a holding plate 8 and a tripping plate 38 whose other end is rotatable with one end having a fulcrum as a fulcrum, and an output lever 51 which operates in a direction perpendicular to the tripping plate 38, and an output lever 51 which operates in a direction perpendicular to the tripping plate 38, A release type electromagnetic device B is equipped with a spring 50 that applies force in the direction of pushing out the lever 51, a magnet 44 that attracts the output lever 51 against the spring force, and a coil 47 that cancels the magnetic flux of the magnet 44. The release type electromagnetic device B and the opening/closing mechanism are connected to the output lever 51 of the release type electromagnetic device B.
The tip 51a of the opening/closing mechanism section A and the other end 38d of the tripping plate 38 of the opening/closing mechanism section A are connected by fitting and are housed in the container body 1, so that it is not possible to use a conventional suction type electromagnetic device or a thermal device. The operating current and operating voltage can be made smaller than that of the magnet 44, and the operating current and operating voltage can be changed by changing the magnetic force of the magnet 44. Since the magnetic force of 44 changes, adjustment is possible, and since the opening/closing mechanism part A and the release type electromagnetic device B are separated and installed in the container 1, it is possible to assemble both A and B separately and then install the internal parts. This makes it possible to improve manufacturing efficiency, and the opening/closing mechanism part A and the release type electromagnetic device B can be connected by simply engaging the engaging part 54 of the output lever 51 with the other end of the tripping plate 38. This has the effect of further simplifying assembly efficiency.

[Brief explanation of drawings]

Drawings 1 to 6 show one embodiment of the present invention.
3 is an exploded perspective view of the main part of FIG. 2, FIG. 4 shows an open state, FIG. 5 shows a closed state, and FIG. 6 shows a tripped state. In FIGS. 4 to 6, a is a front view with the cover removed, and b is a sectional front view of the main part. 1... Body, 11... Handle, 11b... Cam end, 13... Trip link, 18... Link, 22... Trip lever, 25... Movable contact, 27... Movable contact plate, 34... Spring, 35...
...Fixed contact, 38...Tripping plate, 38c...Tripping piece, 38d...Protrusion, 39...Abutment surface, 44...
...Magnet, 47...Coil, 50...Spring, 51...
...output lever, A...opening/closing mechanism section, B...release type electromagnetic device.

Claims (1)

[Claims] 1 A lifting handle, a trip link with one end rotatably connected to the cam end of this handle, a link with one end rotatably connected to the other end of this trip link, and a center rotatably connected to the other end of this link. a movable contact plate that uses one end as a fulcrum to rotate a movable contact fixed to the other end; a spring that applies force to the movable contact plate from the fixed contact so as to open the movable contact; and between the trip link and the link. a trip lever that controls the rotation of the trip lever by engaging and disengaging it freely, a tripping piece that operates the tripping lever, and a tripping lever whose other end is rotatable with one end having a contact surface that comes into contact when the movable contact plate is opened as a fulcrum. The opening/closing mechanism includes a release plate and a retaining plate, and includes an output lever that operates in a direction perpendicular to the release plate, a spring that applies force in a direction to push out the output lever, and a spring that applies force in a direction to push out the output lever. A release type electromagnetic device includes a magnet that attracts the output lever against the force, and a coil that cancels the magnetic flux of the magnet, and the release type electromagnetic device and the opening/closing mechanism are connected to the output of the release type electromagnetic device. A circuit breaker or disconnector characterized in that the tip of a lever and the other end of a tripping plate of an opening/closing mechanism are fitted and connected to each other and housed in a container body.