JPS6258096B2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to circuit breakers.

Conventionally, there was a device which simplified the structure by integrally extending the arc running plate from the yoke of the short-circuit current detection element (Japanese Patent Application Laid-open No. 57171/1983).

However, the structure becomes complicated due to the need to maintain the movable contact and the arc traveling plate at the same potential, and
Since the movable contact, short-circuit current detection element, and spring are located on the same side with respect to the center of rotation of the movable contact, the heat of the arc generated at the movable contact may affect the short-circuit current detection element and spring. It was hot.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a circuit that can electrically connect an arc traveling plate and a movable contact with a simple configuration and can reduce the influence of arc heat on a short-circuit detection element and a spring. and provide disconnectors.

A first embodiment of this invention is shown in FIGS. 1 to 11.
As shown in the figure. That is, the configuration and operation of this circuit breaker will be explained item by item as follows.

() Structure This circuit breaker is a two-pole type with a common mechanism, and can be divided into three blocks in addition to the base and cover for assembly purposes.

(a) Base and cover (Figures 1 to 3)
(Fig. 9) The base 1 is formed into a rectangular shape using a molding material, and has a frame installation groove 1a (Fig. 3) in the center on the front side and both ends in the longitudinal direction on both sides with the frame installation groove 1a in between. A long groove 1b (Fig. 2) extending to
Figure 3) is formed. Frame installation groove 1a
As shown in FIG. 3, a mounting hole 1d penetrating the recess 1c is formed at the bottom, and the power supply side side wall 1e of the installation groove 1a is
A vertical slit 1f for ventilation and link escape is formed in the center of the inner wall surface of the groove by protruding upward, and a cover guide slit 1g is formed in a tapered manner on the outer surface of the side wall 1e, and the same height as the side wall 1e is formed as shown in FIG. A movable shaft guide wall 1h is formed to extend from both ends of the side wall 1e in parallel with the sides, and cover positioning protrusions 1i are formed on both end faces of the side wall 1e. Furthermore, Figures 1 and 3
As shown in the figure, a cover mounting hole 1j is formed on the inside at the center of both ends of the base 1, a guide protrusion 1k is formed on the outside, a shingle disconnector mounting hole 1l is formed, and the frame installation groove 1a and the load side A pair of first block mounting slits 1 m are located at predetermined positions between the cover mounting hole 1j and the cover mounting hole 1j.
(only one of which is shown) is formed (through the recess 1c).

The long groove 1b has openings 1 on both end faces as shown in Figures 1 and 2 (the other long groove is omitted as it is the same).
n is the wire connection port, and a pair of ribs 1 are installed inside it.
o, 1p to form a load-side terminal receptacle 1q and a power-side terminal receptacle 1r, and a partition rib 1s is formed in the center of the long groove 1b to form a receptacle 1 of the partition rib 1s.
The q side is a first block container 1t, a bimetal adjustment hole 1u is formed at its bottom, and a container 1r is formed on the q side.
The side thereof is a third block receptacle 1v, and a mounting slit 1w penetrating into the recess 1c on the back surface of the base 1 is formed in the receptacle 1v. Further, as shown in FIG. 1, cover positioning protrusions 1x are formed on the surfaces of both sides of the base 1 along the long grooves 1b.

As shown in Figures 1 to 4, the cover 2 is made of molding material and is formed to have the same vertical and horizontal dimensions as the base 1 so as to cover the surface of the base 1.The cover 2 has a central part 2a of a predetermined height and is provided with ventilation in the center. Hole for double handle 2
A cover mounting hole 2c and a notch 2d that fits into the guide protrusion 1k of the base 1 are formed at the center of both ends as shown in FIGS. As shown in FIGS. 1 and 2, a driver insertion hole 2e is formed in the hole 2e, a ventilation slit 2e' is formed on the inner surface of the hole 2e, and the lower edge of the hole 2e is used as a terminal holder 2e''.On the other hand, the cover 2, as shown in FIG. A slit 2h is formed in the side wall 2g that is continuous with the ventilation and link escape slit 1f of the base 1, and a slit 2h is formed in the side wall 2g to be connected to the ventilation/link escape slit 1f. A continuous cover guide rib 2i is formed on the lower surface of the base 1.As shown in FIG. An arc grid holding rib 2j is formed, an arc gas exhaust passage forming slit 2l is formed in the power supply side wall 2k of the central portion 2a, and a notch 2m and a gap are formed in the side of the power supply side driver insertion hole 2e communicating with the arc gas exhaust passage forming slit 2l. A slit 2n is formed on the inner circumferential surface of the insertion hole 2e, communicating with the notch 2m and facing the hole entrance.

To connect the base 1 and the cover 2, place the cover 2 on the surface of the base 1 as shown in Figure 3, and
k and the notch 2d, and the guide rib 2i and the guide slit 1g, fit the lower surface of the side wall of the cover 2 into the cover positioning protrusion 1x, and insert the tip of the pin 3 into the mounting hole 1j of the base 1 of the cover 2. Pass it through the mounting hole 2c, and caulk the top end to the cover 2 with a jig. Furthermore, the concave portion 1c on the back surface of the base 1 is
After installing the block on top, the back plate 4 is glued.

(b) The first block (Fig. 1, Fig. 2, Fig. 9)
(Fig. 10) The first block A mainly integrates a tripping element and a movable contact. That is, as shown in FIG. 10, the yoke 5 is formed by bending a plate-like body into an inverted U shape, and has a plunger cylinder mounting hole 5b formed in its upper piece 5a, and a plunger cylinder mounting hole 5b formed on the outer surface of its one side piece 5c. The positioning protrusion 5d is protruded, a pair of arc traveling plate holding pieces 5e are extended from both sides thereof, and a fixing plate recess 5g is cut out at the tip of the other side piece 5f to form a caulking leg 5h. ing. Tripping element 1
The plunger cylindrical body 6 that constitutes the two has an open bottom and a small-diameter mounting cylinder 6a at the top, and a plunger (movable iron core) 7 is slidably inserted into the bottom opening and the trip plate is removed from the cylinder 6a. A thin shaft tip 7b having an operating collar 7a is protruded to lock the body 7c to the upper inner surface of the cylinder 6 (see FIG. 2), and an output part for forced electrode opening faces the lower opening of the cylinder 6. The return coil spring 8 is passed through the thin shaft rear end 7d, and its tip is pressed against the rear end of the body 7c.
A fixed iron core 9 having an insertion hole 9a formed therein is fixed to the lower opening of the cylindrical body 6. A small-diameter caulking cylinder portion 9b is formed on the lower surface of the fixed iron core 9. Further, a coil 10 is wound around the outer surface of the cylindrical body 6.
A load-side terminal plate 10a is welded to the lower end of the load-side terminal plate 10a.

The fixing plate 11 is formed by folding one end of a plate-like body downward to form a bimetal fixing vertical piece 11a and a horizontal folding piece 11b (see FIG. 2), and a central piece 11.
A fixed core mounting hole 11d is drilled in c, a notch 11e is formed at the other end to form a yoke fixing caulking leg 11f, and notches 11g are formed on both sides of the adjacent end of the vertical piece 11a at the central piece 11c. A hole 11a' is formed in the bent part of the vertical piece for easy bending, a screw hole 11h is formed in the horizontal folded piece 11b, and a mounting piece 11i is formed in one side of the central piece 11c.
A fork-shaped caulking leg 11 is attached to the tip of the leg.
forming a j.

The yoke 5 and the fixing plate 11 are arranged so that the center piece 11c of the fixing plate 11 faces the lower opening position of the yoke 5, and the mounting cylinder part 6a of the cylinder 6 is inserted into the mounting hole 5b of the upper piece 5a of the yoke 5 from below. Fit the caulking cylinder part 9b of the fixed core 9 into the mounting hole 11d of the fixed plate 11 from above, and clamp the cylinder 6 around which the coil 10 is wound between the yoke 5 and the fixed plate 11. The caulking leg 11f is attached to the tip of the one side piece 5c, and the caulking leg 5h of the yoke 5 is attached to the notch 1 of the fixing plate 11.
1g in a clamped state and fixed to each other, and the cylindrical portion 9b of the fixed iron core 9 is fixed to the edge of the mounting hole 11d by caulking.

The arc traveling plate 12 is a plate-shaped body bent in a Z shape and arranged vertically, and arc extinguishing grid support steps 12b are formed on both sides of the upper end of the upper vertical piece 12a.
The bent part between a and the horizontal piece 12c is bent obliquely downward and forms an arc transition part 12d, and the lower vertical piece 12e has a positioning hole 12f and a movable contact support piece 12g extending downward from both sides. , mutually opposing movable contact support shafts 12h are pressed from the outer surface of the ends of the support pieces 12g to protrude. This arc travel plate 12 has a positioning hole 12f fitted into a positioning projection 5d of one side piece 5c of the yoke 5,
The lower vertical piece 12e is brought into contact with one side piece 5c of the yoke 5, and the holding piece 5e is bent to remove the lower vertical piece 12.
Crimp e into a hugging state. In this state, the spindle is 12h
is located at the bottom of the fixed plate 11 as shown in FIG.

The bimetal 13 has a predetermined height and the frame 20
The middle part 13a is bent in the width direction in order to ensure insulation, and its lower end 13b is welded to the vertical piece 11a of the fixed plate 11, and an adjustment screw 14 (see Fig. 2) is inserted into the screw hole 11h of the horizontal folded piece 11b. is screwed in, and the horizontal folded piece 11b is pushed down by the reaction of pressing the tip end surface of the adjustment screw 14 against the back surface of the center piece 11c, and the vertical piece 11a is tilted at the bent part having the hole 11a', thereby tilting the tip end 13c of the bimetal 13. determine the initial position of the operation.

The movable contactor 15 is formed by slightly bending a plate-shaped body at a position slightly closer to the rear end of the middle part so that the tip side is curved, and pressing both sides of the middle part from the lower surface to form a semicircular arc-shaped bearing. A return spring support projection 15 is formed by pressing from the bottom surface onto the upper surface of the rear end portion.
b is protruded, and the arc transition protrusion 15c is protruded from the lower surface of the tip by pressing from the upper surface, and the arc transition protrusion 1
A movable contact 16 is fixed adjacent to 5c. Further, a tapered movable frame abutting protrusion 15d is formed by pressing from the lower surface slightly toward the middle portion from the tip end and is raised toward the rear end portion. This movable contact 1
5 is a bearing 15a on the support shaft 12h of the arc traveling plate 12.
The supporting pieces 12g are bent to expand and fit together. Further, a return spring 17 is compressed and interposed between the support protrusion 15b at the rear end of the movable contactor 15 and the lower surface of the center piece 11c of the fixed plate 11. The return spring 17 is an inverted conical coil spring, and its lower end plug small diameter portion 17a fits into the support protrusion 15b, and its upper end large diameter portion 17b is an insertion hole 9a of the cylindrical portion 9b of the fixed iron core 9.
The center is located at , so that the thin shaft rear end 7d of the plunger 7 can push the support protrusion 15b through the center of the spring 17. Further, due to the action of the return spring 17, the top surface of the tip end of the movable contact 15 is supported by coming into contact with the protruding surface of the arc transition portion 12d of the arc traveling plate 12 (after the base is installed, it is supported by the movable frame).

Next, to form an electric path, a copper stranded wire 18b with an insulating tube 18a attached is welded between the upper end of the bimetal 13 and the upper end of the coil 10, as shown in FIG. 13
Welded between the lower end of the movable contact 15 and the lower surface of the rear end of the movable contact 15, the load terminal plate 10a is connected to the coil 10, the copper stranded wire 18b, the bimetal 13, and the copper stranded wire 18c.
and an electric path leading to the movable contact 15, and at the same time, the movable contact 15 and the arc traveling plate 12 are kept at the same potential via the yoke 5 and the like.

As shown in FIG. 10, the load side connection terminal 19 has a screw hole 19b formed on the upper surface of the terminal frame 19a, which is formed by bending a plate-like body into a rectangular tube shape and dovetailing it. 19c, insert the load-side terminal plate 10a into the lower surface of the stopper 19c through the other opening, screw in the terminal screw 19d, and bring its tip into contact with the upper surface of the stopper 19c. Note that the electric wire to be connected is inserted through the one opening of the terminal frame 19a into the contact hole 19c.
and the terminal board 10a and tighten with screws 19d.

Now, the first block A constructed and assembled in this way takes the form as shown in Fig. 2 and has a base 1.
It is stored in the container 1t. That is, by passing the mounting piece 11i provided on the fixed plate 11 through the mounting slit 1m,
Fork-shaped caulking legs 11j from the back of the base 1
slit into a 1m mounting slit,
At the same time, when the load-side connection terminal 19 is positioned in the terminal receptacle 1q, the tip of the movable contact 15 is attached to the base 1.
The head of the adjusting screw 14 faces the adjustment hole 1u of the base 1, so that the position of the bimetal 13 can be adjusted from the back side of the base 1. Further, by attaching the cover 2 to the base 1 in this state, the presser foot 2e'' of the cover 2 presses the upper edge corner of the terminal frame 19a of the terminal 19, and the terminal 19 is fixed.

(c) Second block (Fig. 3, Fig. 4, Fig. 8)
(Fig. 9) The second block B is a shared mechanical part that breaks the electric circuit between the two left and right poles, and as shown in Fig. 8, it mainly consists of a frame 20, a handle 21, a trip lever 22, a trip plate 23, and a movable contact. It is composed of a movable frame 24 that drives the child. As shown in Fig. 8, the frame 20 is made by bending a plate into a U-shape, with two mounting screw holes in the center of the bottom.
0a (Fig. 3), and both side pieces 20b, 20c.
A vertical slit 20d for penetrating the movable frame is bored approximately in the center of the vertical slit 20d.
Both sides 20b, 20 have a slight inclination toward one end of c.
Movable shaft guide slit 20e opening at the upper edge of c
, and the pieces 2 on both sides from the vertical slit 20d
A handle support piece 20f extends vertically upward on the other end side of 0b, 20c, and a trip plate support piece 20
g is formed to extend horizontally outward, and the edge of the inner surface of the upper end of the handle support piece 20f is expanded into an arc shape to form a disc portion 20f', and a bearing is attached to the tip of the trip plate support piece 20g. A hole 20h is formed, and the tripping plate support piece 2
A spring support protrusion 20i is formed on the upper surface of the base of 7g, and a trip plate positioning protrusion 2 is formed on the lower surface of the tip.
0j, and a handle stopper/spring support protrusion 20k is formed on the side of the handle support piece 20f at an intermediate height position, and a support shaft 20l is formed by pressing the inner surface of the upper end portion from the outer surface to provide support. The base portion of the piece 20f is a movable shaft stopper portion 20m.

The handle 21 is formed of an insulating material into a substantially inverted Y shape as shown in FIG.
A protrusion 21b for linking one side of the hem body,
The other is the reset operation protrusion 21c, and a bearing hole 21d is bored in the central connecting part of the three parts.
The lower halves of both protruding parts 21b and 21c, including d, are narrowed to form a step 21e, and on one side of the step 21e, a protruding part 21f for ensuring wall thickness is formed on the link connecting protruding part 21b, and a groove 21g is formed. In addition, a link insertion slit 21i is formed to separate the shaft hole 21h at the center from a shaft hole 21h penetrating the protruding portion 21f, and a spring support cylindrical portion 21j is protruded from the bearing hole 21d. This handle 21 is made by passing the coil hole of the torsion coil spring return spring 25 through the spring support tube 21j, so that the bearing hole 21d faces the upper end of the handle support piece 20f of the frame 20, and the support piece 20f is slightly opened in the open state. The support shaft 20l is inserted into the bearing hole 21d, the return spring 25 is prevented from coming out by the support piece 20f, one end of the return spring 25 is passed through the groove 21g along the step 21e, and the other end is twisted. When the handle 21 is engaged with the spring support protrusion 20k in the energized state and rotated in the direction to turn the handle 21 into the OFF state as shown in FIG. is positioned in contact with the surface of

The link 26 is a dogleg-shaped flat plate with shaft holes 26a and 26b formed at both ends as shown in FIG.
6a and 21h, insert and connect the first movable shaft 27 having the length of the outer dimension width of the frame 20 (simply insert it), and move the handle 21 against the spring force of the spring 25. By rotating, both ends of the first movable shaft 27 are engaged with the stopper portions 20m of the frame 20, thereby positioning the handle 21 in the ON state.

The trip lever 22 is a rectangular plate-shaped body having a width smaller than the inner width of the frame 20 as shown in FIG. 8, and has one end as a tripping plate engaging portion 22a.
A bearing piece 22b is vertically disposed below both sides of the other end, and a shaft hole 22c is formed in the bearing piece 22b, and a link insertion slit 22d is formed at the center of the edge of the other end. One end of a contact pressure spring 28 is welded to the lower surface of the one end of the trip lever 22, and the contact pressure spring 28 is further formed of a narrow leaf spring, with the other end extending to the extent that it protrudes between the bearing pieces 22b of the trip lever 22. A link insertion slit 28a is formed at the rear edge.

The link 26, the trip lever 22, and the contact pressure spring 28 are assembled in the guide slit 20e of the frame 20 by a second movable shaft 29 having a length equal to the outer width of the frame 20. That is, the link 26 is rotated about the first movable shaft 27 to position its shaft hole 26b in the movable shaft guide slit 20e of the frame 20, and the shaft hole 26b of the link 26 is positioned in the link insertion slit 28a of the contact pressure spring 28. The contact pressure spring 28 is biased toward the trip lever side to align the shaft hole 26b and the shaft hole 22c, and the slit 20 of the frame 20 is inserted through the edge of the frame 20.
The second movable shaft 29 is inserted into the shaft holes 26b, 2 from one side of the
2c, the shaft end is slidably positioned on the slit 20e, and the slit 28a of the contact pressure spring 28 is inserted.
An end portion of the movable shaft 29 is elastically supported on the surface of the second movable shaft 29, and the axial movement of the movable shaft 29 is restricted by the pressure.

The tripping plate 23 is made of an insulating molded material and has a window hole 2 in the center for ventilating and trip lever escape, as shown in Figure 8.
The upper piece part 23 is formed into a substantially rectangular plate shape having 3a.
b has both ends extending outward to form a bimetallic pressure-sensitive protrusion 23c on the side surface opposite to the frame 20, and a spring support part 2 at the corner of the window hole of the upper piece part 23b.
3d is notched, and both side pieces 23e have supporting protrusions 23f protruding from the window hole forming surfaces, and both side pieces 23e
Extend the frame facing surface into a chevron shape to form an extending portion 23g.
Plunger pressure sensitive overhang 23h laterally outward
A pair of plunger pressure-sensitive projections 23i, 23 are provided on the side surface of the projecting portion 23h opposite to the frame.
A plunger insertion part 23k is formed between the protrusions 23i and 23j by forming a plunger insertion part 23k, and further, a lower end part 23l of the tripping plate 23 is extended downward, and a hole edge is made thin on the window hole side of the side surface facing the frame. A lever guide taper 23m is formed, and a trip lever latch engagement step portion 23n is formed on the lower surface of the lower end. This tripping plate 23 has a window hole 23a located in the tripping plate support piece 20g of the frame 20, and
0g is slightly bent in the closed state and the spindle protrusion 23
f into the bearing hole 20h (see Fig. 4), and then attach the middle part of the flexible linear spring 30 to the support piece 20g.
One end is hung on the support part 23d at the upper corner of the window hole, and the other end is attached to the support piece 20.
Hang the spring support protrusion 20i at the base of g and hold the tripping plate 23.
are each urged to rotate in the forward direction about the support shaft protrusion 23f as a rotation center, and the lower end portion 23l is locked to the tripping plate positioning protrusion 20j of the support piece 20g.

The movable frame 24 has a vertical slit 20d in the frame 20.
It is an insulating plate-like body with a thickness that can be inserted through the frame 20 and a length about three times the width of the frame, and whose edges are arcuate on both sides. 20d is inserted in a slidable manner in the longitudinal direction, and the lower surfaces of both ends are attached to the base 1.
It comes into contact with the protrusion 15d of the movable contactor 15 installed at.

This second block B is attached to the base of the third block B.
As shown in the figure, insert the support piece 20g of the frame 20 into the container part 1a of the base 1 toward the load side of the base 1, rotate the tripping plate 23 a little, and insert the collar 7a of the plunger 7 onto the plunger insertion part 23k. screw the mounting screw 31 into the screw hole 20a at the bottom from the mounting hole 1d on the back of the base 1,
Tighten and fix. In this state, the end surface of the second movable shaft 29 faces the inner surface of the guide wall 1h of the base 1, and its axial movement is prevented from coming off. 1f, the bimetal pressure-sensitive protrusion 23c of the tripping plate 23 faces the upper end 13c of the bimetal 13, and when the cover 2 is further covered with the base 1, the operating part 21a of the handle 21 protrudes from the handle hole 2b, Both end surfaces of the first movable shaft 27 are guided by the hanging wall 2f and are prevented from coming off, and the bent portion of the link 26 freely passes through the slit 2h. In addition, due to this arrangement on the base, when the circuit breaker is installed on a pillar or wall indoors or outdoors, the power supply side is on the top and the load side is on the bottom of the base 1. The generated heat passes through the window hole 23a of the tripping plate 23, the inside of the frame 20, and the slits 1f and 2h of the base 1 to the handle hole 2 due to convection.
The structure is such that heat is exhausted to the outside from b.

(d) Third block (Fig. 1, Fig. 2, Fig. 10)
(Fig.) The third block C consists of a fixed contact 32, an arc traveling plate 33, an arc extinguishing grid 3, as shown in Fig. 10.
4. Consists of a power supply side connection terminal 35. 1st
As shown in Figure 0, the fixed contact 32 is a plate-shaped body with a predetermined width, and one end is folded upward in a U-shape to fix a fixed contact 36 to the upper surface of the folded piece 32a. An arc transition/arc travel plate positioning protrusion 32b having approximately the same height as the fixed contact 36 is formed by pressing from the lower surface between the edge of the folded piece 32a and the other end of the contact 32. The power supply side terminal board 32c is bent into a Z-shape based on the step on the base installation. The arc traveling plate 33 is made by bending a plate-like body into a substantially L-shape, and forming a vertical piece 3 of the plate-shaped body.
A reinforcing rib 33b for arc travel and prevention of thermal deformation is formed on the inner surface by pressing from the outer surface from the bending part to the upper end at the center of 3a, and a stepped part 33c for placing arc extinguishing grids is formed on both sides of the upper end. Horizontal piece 33d
A notch 33e that fits into the positioning protrusion 32b is formed at the end edge of the mounting plate 33, and a mounting piece 33f is suspended from one side of the horizontal piece 33d to form a fork-shaped caulking leg 33g at its tip. Power supply side connection terminal 3
5 has the same structure as the load side connection terminal, and is given the same reference numeral.

Further, the arc extinguishing grid 34 has a V-shaped groove 34b cut out at one end of seven magnetic material grid plates 34a, and a positioning recess 34c and a caulking protrusion 34 on both sides.
d are arranged at equal intervals, and an insulating side plate 34e having holes corresponding to the protrusions 34d is engaged and fixed by caulking on both sides of the insulating side plate 34e. A placement portion 34f is formed, and the upper and lower surfaces of the side plate 34e are positioned in the recess 34c.

The third block C is assembled on the base 1 as follows. That is, with the power supply side connection terminal 35 attached to the terminal board 32c, the terminal 35 is fitted into the terminal receptacle 1r of the base 1 as shown in FIG. 2, and the fixed contact 32 is fitted into the receptacle 1v of the base 1. By matching the preset container width and the contact width, positioning is performed in the lateral, longitudinal and downward directions, and then the mounting piece 33f of the arc traveling plate 33 is fixed.
is passed through the mounting slit 1w of the base 1, the notch 33e of the horizontal piece 33d is positioned on the protrusion 32b, and while pressing the arc running plate 33 onto the folded piece 32a, the base 1 is moved under the elasticity of the folded piece 32a.
Caulk the caulking leg 33g to the mounting slit 1w from the back side of the screw. As a result, the contactor 32 is firmly fixed, and the elastic force of the folded piece 32a presses the horizontal piece 33d of the arc traveling plate 33 and the folded piece 32a to electrically connect them, and the vertical piece 33a is positioned against the protrusion 32b. is erected at a predetermined position, and is connected to the upper vertical piece 12 of the arc traveling plate 12 described above.
It will be facing a. On the other hand, the movable contact 16 faces above the fixed contact 36. Also, the V-shaped groove 34b is placed downward in the arc extinguishing grid 34, and the mounting portion 34f is
Accordingly, the step 12 at the upper end of the arc running plate 12, 33
b, 33c, and the cover 2 is covered with the base 1 in this state, so that the pressing rib 2j on the back side of the cover presses and fixes the upper surface of the arc extinguishing grid 34, and the rib of the arc traveling plate 33 The upper end of the grid 33b faces the innermost part of the V-shaped groove 34b of the grid 34, and also faces the inner side wall of the cover 2, the hanging wall 2f, and the guide wall 1 of the base 1.
arc extinguishing grid 34 and contact 16,
An arc extinguishing chamber 32g surrounding a portion 36 is formed. In addition, due to this arrangement, the arc extinguishing part and the bimetal 13 are separated by a distance, and since the arc extinguishing grid is located at the upper level when the disconnector is mounted on the wall, the thermal influence of the arc extinguishing part is reduced by the bimetal 13. and the slit 2h of the cover 2,
The notch 2m and the slit 2b form an arc gas exhaust passage with a distance, and the arc extinguishing grid 3
4 and the handle hole 2b of the cover 2 are partitioned by a hanging wall 2f to form a larger separation distance.

() Operation It is divided into ON operation, trip operation, OFF operation, and arc extinguishing operation.

(b) ON operation (a) OFF state (Figures 6, 7 and 11)
Figure b): As shown in Figure 7, the tripping plate 23 is supported by the support piece 20g of the frame 20 by the spring 30.
is positioned in a normal posture on the protrusion 20j of
The handle 21 is positioned by the spring 25 on the protrusion 20k of the support piece 20g of the frame 20, and the reset operation protrusion 21c of the handle 21 pushes down the trip plate engaging portion 22a of the trip lever 22 to release the trip plate 23. The movable contact 15 is hooked onto the engagement step portion 23n for the bar latch.
As shown in FIG. 6, the movable contact 16 is separated from the fixed contact 36 by the action of the return spring 17, and the movable frame 24 on the protrusion 15d is positioned above the vertical slit 20d of the frame 20. Due to this opening, the power supply side connection terminal 3
5 and the load side connection terminal 19, the electric circuit is opened and the load side connection terminal 19 is in an off state.

(b) Operation from the OFF state to the ON state: Push the handle 21 in the OFF state to the left in the figure to bring it into the states shown in FIGS. 2, 3, and 11a. When the handle 21 is pushed to the position shown in Fig. 3, the first
The movable shaft 27 rotates from the virtual line to the solid line as shown in the figure, and the second movable shaft 29 moves down the slit 20e via the link 26.
Along with this, the trip lever 22 rotates about the engagement part 22a supported by the tripping plate 23, and this contact pressure spring 28
4 and push it down. The lower surface of the movable frame 24 contacts the protrusion 15d of the movable contact 15 as shown in FIG. Press down against the In this way, the second movable shaft 29 and the movable contact 1
5, the first movable shaft 27 is connected to the support shaft 20l and the second movable shaft 27.
The movable contact 16 moves downward until it approaches the plane (dead center) that includes the movable shaft 29, and the movable contact 16 comes into contact with the fixed contact 36. This time, with the support of the movable contact 15, the second movable shaft 29 contact pressure spring 28 supported in a biased state;
is further pushed by the movable frame 24 and deflects, and as a reaction, a contact pressure is applied between the contacts 16 and 36. When the first movable shaft 27 exceeds the plane (dead center), the reaction of the contact pressure spring 28 acts to move the first movable shaft 27 away from the plane in a direction beyond the plane. The handle 21 is engaged and supported by the stopper portion 20m, and the handle 21 is in the on state in which the state shown in FIG. 3 is maintained. In this way, the electric circuit is closed and power is applied to the load.

(b) Trip operation (a) Bimetal operation (Fig. 11c): When an overcurrent flows in the circuit in the on state, bimetal 1
3 is self-heated. As a result, the bimetal 13 performs a bending motion in FIG. 2, and the upper end 13c moves toward the bimetal pressure-sensitive protrusion 23c of the tripping plate 23 using the lower end 13b as a fulcrum. When the bimetal 13 moves through this mutual distance set to a predetermined time characteristic by the adjustment screw 14, the protrusion 2
3c to rotate the tripping plate 23 around the support shaft 23f, and as shown in FIG.
move away from a. Due to this tripping operation, the spring force of the return spring 17 and the spring force of the contact pressure spring 28 appear through the movable frame 24 and the movable contact 15, and the trip lever 2
2 is jumped up with great force around the second movable shaft 29, and at the same time the movable frame 24 is pushed up and the movable contact 15 is opened, and is in the trip-free state shown in FIGS. 5 and 11c. This means that the electrical circuit has been severed.

(b) Electromagnetic operation (Fig. 11 d, e): When a short-circuit current flows through the electric circuit, the excitation of the coil 10 increases, generating an attractive force greater than the spring force of the return spring 8 that supports the plunger 7, and fixing it. Attracted to iron core 9, bimetal 1
3 presses the pressure-sensitive protrusion 23c, the collar 7a of the plunger 7 instantaneously hits the plunger pressure-sensitive protrusions 23i, 23j of the tripping plate 23.
The plunger 7
The lower end 7d of the thin shaft is inserted into the insertion hole 9 of the fixed iron core 9.
a and passes through the center of the return spring 17 and strikes the rear end of the movable contact 15, forcibly driving the movable contact 15 to open (FIG. 11e).

(c) Reset operation: When the trip-free state (FIG. 11c, d) is reached, the upward force applied to the second movable shaft 29 in FIG. 5 disappears, and the second movable shaft 29 and the supporting shaft 20l are Since the plane is no longer configured as a dead center, the return spring 25 attached to the handle 21 returns to the OFF state. As the handle 21 returns, the engagement portion 22a of the trip lever 22 is lowered by the reset projection 21c and faces the engagement stepped portion 23n of the tripping plate 23. On the other hand, due to the breakage of the electric circuit, the bimetal 13 is naturally cooled and returned to its original position, and the plunger 7 is returned to its original position by the return spring 8 due to the loss of coil excitation, and the tripping plate 23 is thereby returned to its normal position by the spring 30. do. In this way, it is reset to the OFF state shown in FIGS. 6, 7, and 11b.

(c) Off operation (from on state to off state): 1st
In the on state shown in Figure 1a, the handle 21 is tilted in the off direction (to the right). As a result, the first movable shaft 27 separates from the stopper portion 20m of the frame 20 and attempts to transition from the solid line to the virtual line in FIG.
When the handle 21 crosses the plane (dead center) containing the movable shaft 29 of the second movable shaft 29, the push-up force from the contact pressure spring 28 and the return spring 17 applied to the second movable shaft 29 and the return spring 25 applied to the handle cause the handle 21 to move with momentum. It often collapses into the off state shown in Figure 11b. At the same time, the second movable shaft 29 moves upward, the trip lever 22 rotates about the engaging portion 22a, and the movable contact 15 pushes up the movable frame 24 to open the pole. The trip plate 23 remains in place. In this way, it is turned off.

(d) Arc-extinguishing action Contacts 16 and 36 when the short-circuit current is extinguished
Due to the arc generated between the movable contact 15
Since the folded piece 32a of the fixed contact 32 faces the contacts 16 and 36 in the same direction, a current flows in a horizontal U-shape as shown in FIG. 6 even after opening, thereby extinguishing the arc. A magnetic driving force is generated to extend the arc in the direction of 34, causing the arc to move from the positioning protrusion 32b of the fixed contact 32 onto the rib 33b of the arc traveling plate 33, while the movable contact 15 side also moves from the protrusion 15c to the same potential. V-shaped groove 34b of the arc extinguishing grid 34
The grid plate 34a increases the arc voltage to extinguish the arc. Further, the arc gas is discharged from behind the arc extinguishing grid 34 into the space formed by the holding rib 2j of the cover 2, and passes through the exhaust passage between the slit 2l and the arc travel plate 33, which has a recess formed by the rib 33b, to the notch 2m. and is exhausted to the outside through the slit 2n.

As described above, this circuit breaker consists of the yoke 5 that constitutes the short circuit current detection element and the arc traveling plate 1.
2 and the movable contact 15 are integrally constructed, it can be made into a block, and the number of mechanical and electrical parts can be reduced to simplify assembly, and the arc traveling plate 12 and the movable contact 15 can be kept at the same potential. As a result, the arc at the time of a short circuit can be shifted to a smooth one.

A second embodiment of the invention is shown in FIG. That is, in the first embodiment, this circuit breaker is constructed by bending a single plate to integrally form the yoke 5' and the arc traveling plate 12', and by folding the fixed plate 11'. A vertical piece 11'' is extended to the end opposite to the yoke 5' and caulked to the joint between the yoke 5' and the arc travel plate 12', and a movable contact support piece 5 is attached to the fixed plate 11'.
0 is provided vertically, and the rest is the same as the first embodiment.

In this case, the parts can be more easily assembled with each other, and the same effects as in the first embodiment can be obtained.

As described above, this circuit breaker includes a yoke that connects arc traveling plates and has a movable contact support piece and a fixing part for mounting, a short circuit current detection element held by this yoke, and the movable contactor. A substantially middle portion is rotatably attached to the child support piece, and a rear end faces the output portion of the short-circuit current detection element, and a movable contact is provided at the tip, so that the tip approaches the arc running plate when the contact is opened. Since it includes a movable contact and a return spring interposed between the rear end of the movable contact and the yoke, it has the following effects.

That is, since the movable contact is pivotally attached to the yoke, the arc running plate and the movable contact can be kept at the same potential with a simple configuration. In addition, since the movable contact is located on the opposite side of the rotation center of the movable contact from the short-circuit current detection element and the return spring, the short-circuit current detection element and the return spring are damaged by the heat of the arc generated at the movable contact. In particular, when pushing the rear end of the movable contact at the output section of the short-circuit current detection element, it can prevent the output section from welding to the movable contact due to heat, and also prevent burnout of the return spring. can be used to ensure reliable operation. Furthermore, the arc travel plate, movable contact, yoke, short circuit current detection element, and return spring can be integrally made into a block and fixed to the instrument base using the mounting fixing part, which reduces the number of electrical and mechanical parts. Assembly becomes easier.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view of the first embodiment of the present invention in the on state, and FIG. 2 is a cross-sectional view taken along the line,
Figure 3 is a cross-sectional view taken from Figure 1, Figure 4 is a cross-sectional view taken from Figure 3, Figure 5 is a cross-sectional view taken from Figure 1 in the trip state, and Figure 6 is a cross-sectional view taken from Figure 1 in the off state.
7 is a line sectional view taken from FIG. 1 in the off state, and FIG. 8 is an exploded perspective view of the second block.
Figure 9 is a perspective view with the cover removed; Figure 10 is a perspective view with the cover removed;
The figures are exploded perspective views of the first and third blocks, FIG. 11 is an operational diagram of the armature cutter, and FIG. 12 is a side view of the first block of the second embodiment. 5, 5'... Yoke, 7d... Thin shaft rear end portion serving as output section, 10... Coil of short circuit current detection element, 11,
11'...Fixing plate constituting the mounting fixing part, 12,
12'... Arc traveling plate, 12g, 50... Movable contact support piece, 15... Movable contact, 16... Movable contact,
17...Return spring.

Claims (1)

[Claims] 1. A yoke that connects the arc traveling plate and has a movable contact support piece and a fixing part for attachment, a short circuit current detection element held by this yoke, and a substantially middle portion of which is rotatably attached to the movable contact support piece. a movable contact whose rear end faces the output part of the short-circuit current detection element, and a movable contact is provided at the tip so that the tip approaches the arc running plate when the contact is opened; and the rear end of the movable contact. A circuit breaker comprising a return spring interposed between an end and the yoke.