KR100516589B1 - Circuit breaker - Google Patents

Abstract

An object of the present invention is to improve the assembly structure therein for wiring breakers and earth leakage breakers, so as to cope with automatic assembly by introducing a robot.

The contactor opening / closing mechanism unit 50 and the overcurrent trip device 10 of each pole, which are assembled by connecting the movable contactor 5, the handle 19, the latch 22, and the opening / closing spring 33 to each other, are connected to the tripping device. The trip bar and the latch support are collectively incorporated in the common unit case 32 to form the trip device assembly unit 60, and the respective units are inserted from the upper part into the predetermined assembly position with respect to the case 1 of the mold container. In the final process of assembly, the unit is pressed in from the top by the cover on the case and held in place.

Description

Circuit breaker {CIRCUIT BREAKER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to circuit breakers for wiring breakers and earth leakage breakers. More specifically, the present invention relates to an assembly structure thereof.

First, the structure of the conventional circuit breaker which illustrated the earth leakage breaker for 3-phase circuits is shown in FIG. In the drawing, the parts of each part constituting the circuit breaker are all assembled in a mold container (resin molded article) consisting of the case 1 and the cover 2, and the current path inside the breaker is integral with the power supply terminal 3. Flexible contact of the fixed contact 4, the fixed contact 4a of the fixed contact 4, the movable contact 5 contacting through the movable contact 5a, and the movable contact 5 by spot welding ( The lead wire 6 which is flexible, the lead board 7 in which the other end of the lead wire 6 was connected by spot welding, the relay board 9 in which the lead board 7 was fastened with the screw 8, and the relay board ( The coil 11 of the overcurrent trip device 10, one end of which is connected to 9) by soldering, and the other end of the coil 11, which is formed by the load side terminal 12 connected by soldering. Here, the lead wire 6 of each pole penetrates through a zero current transformer (ZCT) 13, and when a short circuit occurs, a secondary output is generated to the ZCT 13. An earth leakage detection circuit for amplifying the secondary output and outputting a trip signal is mounted on the printed circuit board 14, and the power supply line 15 is spot welded to the lead plate 7 together with the lead wire 6.

In addition, the movable contact 5 is maintained at the right end of the figure so as to be rotatable and is urged by the elastic force of the contact spring (compression spring) 16 in the clockwise direction, but is pushed down by the opening / closing mechanism 17. It is pressed against the fixed contact 4. The opening / closing mechanism 17 includes a handle 19 bearing to the case 1 via a spindle 18, a link 20 to which one end of the lever arm 19a of the handle 19 is connected, and a link 20. One end is connected to the other end of the rod), and the other end contacts the movable contactor 5, and at the same time, the push rod 21 and the latch 18 having one end connected to the spindle 18 slide freely up and down in the groove of the case 1. ), A link 23 or the like that connects the latch 22 and the link 20. 19b is a handle of the handle 19.

Moreover, in the ON state shown, by the action of the contact spring 16, the link 20 receives a clockwise rotational force through the push rod 21, while the latch 22 is clockwise through the link 23. Although the rotational force is received, the tip is locked by the nail 24a of the trip bar 24 to prevent rotational movement. The trip bar 24 is rotatably supported by the case 1 via the insulating bar 24b over each pole, and a trip arm 24c is provided in correspondence with the overcurrent trip device 10 of each pole. . In addition, the nail 24a is integrally provided on the opposite side to the trip arm 24c of the center pole.

On the other hand, in the overcurrent trip device 10, as shown in Fig. 16, the oil dash pot 26 through which the coil 11 is inserted into one leg of the L-shaped magnetic yoke 25 is connected to the yoke 25. It is penetrated by soldering, and armature 27 is freely supported at the tip of the other leg. The armature 27 is held in the position shown by the return spring 28 between the yokes 25 and faces the electromagnetic pole 29 of the head portion of the oil dash pot 26. One end of the coil 11 penetrates through the yoke 25 and is soldered to the relay plate 9, and the other end is soldered to the load side terminal 12. In addition, the oil dash pot 26 is for adjusting the trip operation time as is well known, and has a structure in which a plunger is sealed together with a brake spring in a non-magnetic cylinder filled with oil.

Assembly of the main circuit portion of the circuit breaker is performed as described below. First, the fixed contact 4 and the printed circuit board 14 are built into the case 1. Subsequently, the lead wire 6 is connected to the movable contact 5, the lead wire 6 is passed through the ZCT 13, and then the assembly in which the lead plate 7 and the power supply line 15 are connected to the other end is connected to the case. Inserted into (1), the movable contact 5 is received by the bearing of the case, and the lead plate 7 is fitted into the groove formed in the case 1 and held at this position. Subsequently, the relay plate 9 of the overcurrent trip device 10 is superimposed on the lead plate 7 to fasten the screw 8 between the lead plate 7 and the relay plate 9. The screw 8 is tightened by inserting a driver into a hole opened in the bottom surface of the case 1, and then soldering the other end of the power supply line 15 to the printed circuit board 14. Thereafter, the opening mechanism component and the handle 19 made up of the push bar 21, the latch 22, and the link 23 are sequentially built into the case 1, and finally, the cover 2 is placed on the case 1. Tighten the screws.

The opening and closing operation of the circuit breaker having the above-described configuration is well known, and when the knob 19b of the handle 19 is rotated to the dotted line position by manual operation from the ON state of FIG. 15, the push rod 21 is connected through the link 20. This is pulled up and the movable contact 5 is opened to the dotted line position by the action of the contact spring 16 (OFF operation). On the other hand, when the main circuit current enters the overcurrent state and the overcurrent trip device 10 is operated, and the armature 27 is attracted to the electromagnetic pole 29, the trip bar 24 counterclockwise through the trip arm 21c. Is rotated, the locking of the latch 22 by the nail 21a is released, and the latch 22 rotates counterclockwise. As a result, the link 23 is displaced to the dotted line position, the push bar 21 is also pulled up at the same time, and the movable contact 5 is opened (trip operation). In addition, if an unbalance occurs in the main circuit current due to the occurrence of a short circuit, a trip signal is output from a short circuit detecting circuit incorporating the secondary output of the ZCT 13, and this signal is a short circuit provided separately from the overcurrent trip device. Operate the trip coil unit. As a result, the trip bar 24 is driven in the same manner as the overcurrent trip operation to perform the trip operation.

The circuit breaker has the same structure as the circuit breaker ZCT 13 and printed circuit board 14 removed from the circuit breaker.

In the production of the circuit breaker described above, it is important to not only improve the quality and reliability of the product, but also to further reduce the cost, and to this end, the production line of the circuit breaker is FA and It is necessary to increase productivity by adopting an automatic assembly method.

However, in order to produce the circuit breaker products using an automated line incorporating an assembly robot, it is necessary to reassess the assembly structure of the circuit breaker itself, and to have a structure capable of effectively utilizing the function of the assembly robot introduced into the manufacturing line. . That is, the assembly robot used in the automatic assembly line is required to adopt a fixed sequence robot (for example, a rectangular coordinate type 1-axis robot) as simple as possible in terms of equipment cost and maintenance. There is a need for an assembling structure capable of assembling various components only by the phosphorus movement.

In this regard, in the conventional circuit breaker, various component parts are separately embedded in the case 1 of the mold container so that the bearing or screw type is fixed. The direction of assembly varies depending on the parts, and the screws may be different depending on the parts. The fastening is performed from the lower surface side of the case. For this reason, since the assembly work is complicated, the assembly robot with simple movement cannot cope with it. Therefore, it is very difficult to achieve the complete automation of assembly by the robot since the conventional structure is largely dependent on manual labor.

SUMMARY OF THE INVENTION The present invention has been made in view of such a point, and the unit of the circuit breaker is functionalized for each of the above-described circuit breakers and earth leakage breakers, and the units of the circuit breaker are in the same direction, specifically, the case. An object of the present invention is to provide a circuit breaker configured to cope with automatic assembly by a robot by improving the assembly structure so that it can be assembled and maintained stably in a predetermined position simply by pushing it from above.

In order to achieve the above object, according to the present invention, an overcurrent trip device as a contact opening / closing mechanism and trip means connected to a power supply side and a load side, a fixed and movable contactor, and a handle in a mold container combining a lower case and an upper cover Or in a circuit breaker incorporating an overcurrent trip device and an earth leakage trip device,

A contactor opening and closing unit unit assembled by connecting a movable contactor, a latch of the contactor opening and closing mechanism, an opening and closing spring, and a handle to each other;

An overcurrent trip device for each pole, a trip bar associated with the trip device, a tripping device assembly unit in which a latch support is collectively incorporated in a common unit case;

Each said unit is inserted in the predetermined assembly position from above with respect to the case of a mold container, respectively.

Each unit is pressed from above by a cover on a case so as to be held in place (claim 1).

Moreover, according to this invention, the trip device assembly unit in the said structure shall be comprised by the following specific aspects.

(1) An earth leakage detection ZCT and a printed circuit board applied to the main circuit conductor and the earth leakage breaker are placed on the trip unit assembly unit on the upper side of the unit case (claim 2).

(2) A positioning fixing means of a tripping device assembly unit, wherein a connecting piece having a hole formed in the unit case and an ear-shaped protrusion piece which is laterally expanded from the left and right ends are formed, and at the same time, the protrusion having the connecting piece having the hole is formed at the case side of the mold container. A supporting support surface and a supporting groove into which the projection pieces are fitted are formed, and the projection pieces of the unit case incorporated in the case are pressed and held by a cover which covers the case (claim 3).

(3) In the above (2), the pair of left and right perforated connection pieces are provided on the side facing the contact opening and closing mechanism unit built in the case of the mold container with respect to the unit case of the trip device assembly unit. 4).

(4) In the above paragraph (2), the press-fitting wall portion overlapping with the wall surface of the unit insertion portion on the case side facing this is formed on the front and rear end faces of the unit case of the trip device assembling unit (claim 5).

As described above, the main components of the circuit breaker are unitized by function, and various components including these units are inserted into the case of the mold container from the same direction to be assembled, thereby assembling the product by hand. It can fully cope even if it replaces by automatic assembly. In particular, the overcurrent trip device of each pole, the trip bar associated with the trip device, and the latch support are collectively incorporated in a common unit case to form a trip unit assembly unit, so that each component is separately included in the breaker case. The circuit breaker's tripping characteristics can be stabilized by reducing the number of steps and improving the work efficiency as well as ensuring high assembly accuracy.

Further, by utilizing the unit case of the trip device assembling unit, by arranging a ground fault detection ZCT and a printed circuit board applied to the main circuit conductor and the ground fault breaker on the upper side thereof, the circuit breaker of the ground fault breaker specification can be flexibly supported.

Furthermore, by adopting the configuration described in the above (2) to (4) as the positioning fixing means of the trip device assembling unit, the unit case with respect to the case (mold container of the circuit breaker), etc. There is no fear of deviation from the predetermined assembly position under the influence, whereby the relative positional relationship between the latch support built into the unit case and the latch of the contact opening / closing mechanism portion opposed thereto can be properly maintained to perform a stable trip operation. .

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described based on FIG. In addition, the same code | symbol is used for the part corresponding to a conventional example.

First, the assembly structure of the three-pole circuit breaker which becomes the specification of a circuit breaker in FIG.2 (a), (b), and the specification of an earth leakage circuit breaker in FIG.3 (a), (b) is shown. That is, the circuit breaker is comprised by the opening / closing mechanism part and the overcurrent trip device accommodated in the mold container which consists of the case 1 and the cover 2, The current path is as follows. That is, in the wiring breakers of FIGS. 2A and 2B, the fixed contact 4, the fixed contact 4, the fixed contact 4a and the movable contact 5a having the power supply terminal 3 integrally formed at one end thereof. One end to the movable contactor 5 contacting through the flexible contact wire, the flexible lead wire 6 connected to one end of the movable contactor 5, the relay terminal 30 connected to the other end of the lead wire 6, and the relay terminal 30. The coil 11 of the overcurrent trip device 10 to which the line 11a is connected, and the load side terminal 12 to which the other lead wire 11b of the coil 11 is connected are formed in this order. On the other hand, in the earth leakage breaker of FIGS. 3A and 3B, a ZCT 13 including a primary conductor 31 made of a fixed conductor is provided between the relay terminal 30 and the overcurrent trip device 10. The printed circuit board 14 is connected by mounting an electric leakage detection circuit in the relay terminal 30, and the structure other than that is the same as that of the wiring breaker of FIG. 2 (a), (b). Do.

Here, the movable contact 5 is connected to the tip of the arm 19a of the handle 19 so that rotational movement is free through the projection 5b, and the handle 19 is an integral spindle 19c. It is supported by the bearing groove of the case 1 so that rotational motion is free through it. In addition, an opening / closing spring 33 made of a tension coil spring is placed between the movable contact 5 and the latch 22, and the movable contact 5 is moved by the tension of the opening / closing spring 33. It is pressed against the fixed contact 4 by receiving the rotational force to the support point clockwise. The latch 22 is supported by the spindle 22a in the bearing groove of the case 1 so as to be freely rotatable, and is pressed and held from above in the bearing groove formed inside the cover 2. In the manufacture and assembly of the circuit breaker, the contactor opening / closing unit is connected to each other by the components of the movable contactor 5, the handle 19, the latch 22, and the opening / closing spring 33 in the state shown in FIG. 50 is assembled, and the contactor opening and closing mechanism unit 50 is inserted into the case 1 from above and assembled at a predetermined position.

In addition, the overcurrent trip device 10 is also described later, after combining the overcurrent trip device 10 of each pole with a component such as a trip bar and a latch support, and then collectively housed in the common unit case 32 to FIG. 1. The illustrated trip device assembly unit 60 is constructed, and the unit 60 is assembled to the case 1. In the earth leakage breaker, the ZCT 13 shown in FIG. 3 is mounted on the upper side of the unit case 32 of the trip unit assembly unit 60, and the printed circuit board 14 is placed on the upper side thereof. do.

Next, the assembling structure of the contact opening and closing mechanism unit 50 and the assembling procedure thereof will be described with reference to FIGS. 4 to 6. First, FIG. 4 shows a preassembled state in which the handle 19 is separated from the assembly in which the movable contact 5 is connected to the latch 22.

Here, the movable contact 5 is formed in the illustrated shape with a pair of left and right arm portions by press working of the plate conductor, as shown in FIG. 5, and the movable contact 5a is caulked by caulking. At the same time, the arm shaft tip is integrally formed with the protrusion 5b to protrude outward. Moreover, the tongue piece 5c which catches on the groove | channel of the latch 22 is raised between arm parts, and the spring hook 5d is bent sideways from the other arm part, and is formed. And one end of the opening-closing spring 33 hangs on the spring hanger 5d. Moreover, the flexible lead wire 6 described in FIG. 2 is connected to the back surface of the movable contact 5a by spot welding.

4, the latch 22 is made of a resin molded product, and the shaft portion 22b is formed integrally with the spindle 22a and integrally formed at the central pole portion, and the shaft portion is cut off at the center portion for each pole. The spring hanger 22c which consists of these is integrally molded, and the groove | channel 22d cut | disconnected by the L-shaped cross section in the longitudinal direction is formed in the lower surface side of the spindle 22a of the latch 22. As shown in FIG. On the other hand, the handle 19 is a resin molded product consisting of a pair of left and right lever arms 19a, a handle 19b, and a spindle 19c corresponding to each pole, and a movable contact 5 on the inner surface of the lever arm 19a. The U-shaped bearing groove 19d in which the protrusion shaft 5b of which is fitted is formed.

In order to assemble the contactor opening / closing mechanism unit 50, first, one end of the gun opening / closing spring 33 is hooked on the movable contactor 5 to the spring hook 22c of the latch 22, and the latch 22 and the movable contactor. Connect (5). Subsequently, as shown in Fig. 6A, the movable contact 5 is pivoted in the direction of the arrow in the drawing while pulling the opening / closing spring 33, and the tongue 5c as shown in Fig. 6B. The tip of the hook is hooked on the groove 22d formed on the lower surface side of the latch 22. Thereby, the movable contact 5 is latched and held by the latch 22 by the tension of the opening-closing spring 33, and it is in the provisional assembly state shown in FIG. Subsequently, the handle 19 is connected to the provisional assembly of the latch / movable contact described above. In this assembling process, while the arm of the movable contactor 5 is bent, the projection 5b at its tip is inserted into the bearing groove 25a formed in the lever arm 19a of the handle 19. Thereby, the handle 19 and the movable contactor 5 are connected in a link form, and the assembly of the contactor opening / closing mechanism unit 50 shown in FIG. 1 is completed.

Next, the assembling structure of the trip device assembly unit 60 described above and the assembling procedure thereof will be described with reference to FIGS. 7 to 10.

First, the perspective view which looked at the unit case 32 from the load side (right side of FIG. 1) is shown in FIG. In the figure, the unit case 32 is integrally molded by mold resin, and an overcurrent tripping device accommodating space 39 for three poles is formed so as to open to the load side. In the upper and lower portions of the left and right walls of each space 39, a pair of each of the U-shaped grooves 40, 41 facing each other are provided in the front-rear direction. As described later, the yoke 22 of the overcurrent trip device 10 is inserted into the groove 40, and the flange 26a of the oil dash pot 26 is press-fitted to the groove 41, respectively. An insulating hood 42 is formed at the top of each space 39 to accommodate the top of the oil dash pot 26. In addition, this insulating hood 42 can also be omitted. In addition, in the example of illustration, each pair which hold | maintains the relay terminal 30 in the case where a circuit breaker is comprised as a circuit breaker on one side surface of the insulating hood 42 and the mutually opposing surface of the upstanding wall provided facing it. Groove 43 is provided in the vertical direction. Further, an upper surface of the unit case 32 is provided with a concave portion 44 of an arcuate surface on which the ZCT 13 is placed between the insulating hood 42 of the center pole and the right pole. 10, the overcurrent trip device 10 for one pole is inserted into the space 39 corresponding to each pole from the side as shown in FIG.

Here, the improved holding structure at the time of attaching the oil dash pot 26 of the overcurrent trip device 10 to the unit case 32 is shown to FIG. 10, FIG. 11 (a), (b). That is, in the top plate of the space 39 formed in the unit case 32, a circular groove 32a having a part of the circumferential surface opened forward is formed, and the oil dash pot 26 is formed in the circular groove 32a. The upper end of the c) is inserted and held from the front. In this case, the slit-shaped groove 32b is formed in the side of the circular groove 32a as shown to Fig.11 (a). As a result, when the oil dash pot 26 is pushed into the circular groove 32a, the edge of the circular groove 32 can be bent so that the edge is enlarged, and the oil dash pot 26 can be easily inserted. Departure is prevented.

In addition, about the groove 41 formed in the lower side of the unit case 32, as shown in FIG. 11 (b), the separation prevention protrusion 41a is formed in the groove | channel entrance part, and the groove 41 is further formed. A slit-shaped groove 41b is formed on the outer side of the side to make the projection part flexible. Thereby, like the top part of the said oil dash pot 26, the lower edge 26a can be easily pushed into the groove | channel 41, and can be kept stable in place.

On the other hand, the power supply side (back side of the case shown in Fig. 7) of the unit case 32, as shown in Fig. 8, a pair of left and right support plates 45 for supporting the trip bar 24 and the latch support 34 ) Is formed upright, the front end surface of the U-shaped bearing groove 47 for supporting the latch support 34, the key hole bearing groove 46 for supporting the trip bar 24, the upper end surface It is cut off and formed. Here, the trip bar 24 has a structure as shown in FIG. 9, and the trip arm 24c is provided at each pole in the insulation bar 24b, and the large diameter part 24d is provided at a constant width in the center part. The nail 24a which consists of a fan-shaped protrusion part is provided in the one end side through the clearance gap corresponded to the board thickness of the support plate 45 (refer FIG. 8) of the unit case 32. As shown in FIG. On the nail 24a, the stopper part 24e which functions mentioned later is integrally formed in the key shape. Moreover, the arm part 24f which protruded in the direction substantially orthogonal to the trip arm 24c in one end of the insulation bar 24b is for making the trip bar 24 rotate by hitting the manual trip button which is not shown in figure. Moreover, the spring hook piece 24g which bends in a key shape along the axial direction is integrally formed in the center pole part of the insulation bar 24b, and the one end of the return spring 35 hangs on this as shown. The trip bar 24 holding the return spring 35 at one end is inserted into the bearing groove 46 of the unit case 32 and supported as shown in FIG. 8. At that time, the large diameter portion 24d of the insulation bar 24b is fitted inside the left and right support plates 45, and the insulation bar 24b is positioned in the axial direction. Moreover, the left support plate 45 of FIG. 8 enters in the clearance gap between the large diameter part 24d and the nail 24a. In addition, although not shown in figure, the two surfaces of the outer periphery are removed by the part supported by the bearing groove 46 of the insulation bar 24b (both sides of the large diameter part 24d), and the shaft diameter part ) Is formed, and the trip bar 24 inserted into the narrow bearing groove 46 through the shaft diameter portion is rotated 90 degrees after insertion, thereby preventing separation. Moreover, each pair which fits and holds the relay terminal 30 in the case where a circuit breaker is comprised as a short circuit breaker on the opposing surface of a pair of left and right upright walls respectively formed in three places in the upper part of the power supply side of the unit case 32 is carried out. The groove 48 (see FIG. 7) is provided in the vertical direction. Moreover, the base plate 49 of the space 39 comprises the stopper which regulates the suction stroke of the armature 27 of the overcurrent trip device 10 as mentioned later.

8, the latch support 34 made of a steel plate has support arms 34d on both sides of the rectangular engaging portion 34c, and at the same time as the protrusion 34a protrudes outward, The hook 34b is bent and formed so that the spring hook piece 34e may be bent in the form of a key at the tip of one supporting arm 34d and protrude laterally to the front end side of the engaging portion 34c. The latch support 34 has a protrusion 34a inserted into the bearing groove 47 to receive the hook. At that time, the hook 34b is housed inside the stopper piece 24e of the trip bar 24. Then, the other end of the return spring 35, one end of which is caught by the trip bar 24, is caught by the spring hook piece 34e, so that the projection shaft 34a is kept out of the bearing groove 47 by the tension, and at the same time, the hook 34b touches the stopper piece 24e of the trip bar 24 to counteract the rotational force due to the tension.

The contact opening / closing mechanism unit 50 and the trip device assembly unit 60 assembled as described above are predetermined from above by a handling operation of the assembly robot with respect to the case 1 of the mold container as shown in FIG. It is inserted in the built-in position. Moreover, components, such as a power supply side terminal 3 and the fixed contact 4, are previously built in the case 1. As shown in FIG.

Here, the contactor opening and closing mechanism unit 50 is held at the assembly position as follows. That is, in the case 1, a pair of left and right plate-shaped bearing portions 1a stand up integrally from the bottom portion, and the upper surface has semi-circular bearing grooves 36 and 37 at two front and rear portions through a step. Is formed. Then, when the contact opening and closing mechanism unit 50 is inserted into the case 1 along the arrow shown in Fig. 1, the spindle 22a of the latch 22 is supported on the bearing groove 36 in this position, and the handle 19 The spindle 19c of) is supported above the bearing groove 37. Although not shown, a semicircular bearing groove corresponding to the bearing grooves 36 and 37 is provided in the cover 2 of the mold container, and the cover 2 is covered with the case 1 in the final step of assembly. By fastening, the shaft portions of the handle 19 and the latch 22 are sandwiched between the bearing grooves 36 and 37 of the case 1 and the bearing grooves on the cover 2 side to be bearing. At this time, the movable contact 5 is pressed against the fixed contact 4 in the built-in position so that the tongue piece 5c of the movable contact 5 comes out of the groove 22d of the latch 22, and the provisional assembly state is released. The movable contact 5a is pressed against the fixed contact 4a by the tension of the opening / closing spring 33.

On the other hand, the trip device assembling unit 60 is inserted into the case 1 and positioned and held therein, and is pressed and fixed from above by the cover 2 covered by the case 1 in the final step of assembling.

Here, as an positioning fixing means for the trip device assembling unit 60, an embodiment of the improved type corresponding to claims 3 to 5 of the present invention will be described with reference to Figs. That is, in this embodiment, with respect to the unit case 32, as shown in (a) to (c) of FIG. 12, a pair of left and right pairs of perforated connecting pieces 32c and left and right sides are provided on the upper center portion. The protruding piece 32d which protrudes is formed. The connecting piece 32c is formed at an upper side thereof by sandwiching a latch support 34 (see FIG. 8) built into the unit case 32, and the supporting piece 32c at the case side described later. An engagement hole 32e that fits snugly against the hole is drilled. In addition, rib-shaped press-fit wall portions 32f are formed in the longitudinal direction in front and rear of the unit case 32. On the other hand, the support seat surface 1c having the support pin 1b having the perforated support piece 32c as shown in Figs. 13A to 14C and Fig. 14 on the inside of the case 1; On the left and right walls, a supporting groove 1d into which the ear projection piece 32d is fitted is formed.

As shown in FIG. 1, when the trip device assembling unit 60 is incorporated into the case 1, the engaging holes 32e of the unit case 32 are connected to the support pins 1b of the case 1. It fits and pushes so that the connection piece 32c may overlap on the support seat surface 1c. Thereby, the unit case 32 is positioned with respect to the case 1 in the state shown in FIG. In this position, the press-fit wall portion 32f is press-fitted between the front and rear wall surfaces of the case 1, and the projection pieces 32d protruding from side to side are fitted into the support groove 1d of the case 1. Further, in this built-in state, as shown in Fig. 14A, the projection pieces 32d protruding from side to side are slightly displaced upwardly from the bottom surface of the support groove 1d, and the circumference of the case 1 The height of the projection piece 32d is set so as to protrude upward by ΔH (about 0.1 mm) from the separation line of the mold molding.

When the cover 2 is screwed onto the case 1 in the final step of assembling, the projection pieces 32d protruding upward from the circumference of the case 1 as shown in FIG. It is bent downward by the pressure of the cover 2 and is in close contact with the bottom surface of the support groove 1d of the case 1 and is stored in the groove. In the unit case 32, the connecting piece 32c is placed on the support seat surface 1c of the case 1 at the central portion thereof, and the projection pieces 32d on both the left and right sides are pressed against the cover 2 from above by the cover 2. You lose. As a result, the unit case 32 is fixed to the case 1 of the mold container so as not to deviate from the predetermined position in the front, rear, left, and right directions.

In this way, positioning and fixing the trip device assembly unit 60 at a predetermined built-in position with respect to the case 1 is extremely important in ensuring stable tripping operation of the circuit breaker. That is, the latch support 34 and the trip bar 24 which are opposed to the latch 22 of the contactor opening / closing mechanism unit 50 are assembled in the unit case 32, and the latch support 34 is a tripping operation of the breaker. Under mechanical load. Therefore, if the positioning fixing of the unit case 32 is not stable, there is a possibility that the tripping operation may become unstable because the linking position between the latch 22 and the latch support 24 is displaced under the influence of mechanical load or the like. . In this regard, a stable trip operation can be ensured by adopting the holding structure described in FIGS. 12 to 14.

In addition, in the state which inserted the contactor opening / closing mechanism unit 50 and the tripping-assembly unit 60 in the case 1 in FIG. 1, in order to connect internal wiring like FIG. 2 and FIG. The welded relay terminal 30 is press-fitted and held in the groove 48 (see FIG. 7) of the unit case 32 from above. Here, the relay terminal 30 is a J-shaped conductive bracket formed by bending two long and long legs, and the side edge of the long leg portion which protrudes slightly to the left and right is pressed into the groove 48. Subsequently, in the case of the earth leakage breaker specification of FIG. 3, the ZCT 13 having penetrated the primary conductor 31 is mounted on the recess 44 (see FIG. 7) of the unit case 32, and the primary conductor 31 is provided. One end of is connected to the short leg part of the relay terminal 30 and the other end is connected to the lead wire 11a of the coil 11 of the overcurrent trip device 10 by spot welding, respectively. In addition, the primary conductor 31 is formed in a single line, and as shown in Fig. 3B, the left and center poles are formed in a U shape, and the right pole is formed in an L shape. In addition, a printed circuit board 14 equipped with a ground fault detection circuit for detecting the occurrence of a ground fault from the secondary output of the ZCT 13 and outputting a trip signal is housed in a protective case and placed on the upper surface of the unit case 32. Here, the printed circuit board 14 becomes a rectangular shape across the left and right poles of the circuit breaker, and the part corresponding to the support plate 45 of the unit case 32 is cut off. And the long leg part of the up-and-down left-and-right relay terminal 30 penetrates through the printed board 14, is soldered and electrically connected to the power supply terminal part of the printed board 14, and mechanically holds the printed board 14 Doing. That is, the relay terminal 30 also serves as a power supply line to the printed board 14. In addition, the tip portion of the long leg portion of the relay terminal 30 inserted into the printed circuit board 14 has a rod shape.

On the other hand, in the wiring breaker specification shown in FIG. 2, the relay terminal 30 connected to the lead wire 6 is press-fitted and held in the groove 43 of the unit case 32, and the short leg thereof is a lead wire of the coil 11. It joins to 11a by spot welding.

In addition, the trip operation in the circuit breaker of FIGS. 2 and 3 will be described here. 2 or 3, when the handle 19b of the handle 19 protruding from the cover 2 is rotated to the dotted line position, the action of the opening / closing spring 33 on the movable contact 5 is reversed. The movable contact 5 is driven counterclockwise and is opened from the fixed contact 4 (OFF operation). On the other hand, in the overcurrent state, the armature 27 of the overcurrent trip device 10 is attracted to the electromagnetic pole 29, and this armature 27 presses the trip arm 24c of the trip bar 24 to trip the trip bar 24. Rotate clockwise in the drawing. Thereby, the nail 24a of the trip bar 24 comes out of the hook 34b of the latch base 34, and the latch base 34 with which the latch was released rotates counterclockwise in the figure. As a result, the latch 22 is unlocked by the latch support 34, and as a result of the rotational movement in the clockwise direction of the drawing, the action of the opening / closing spring 33 on the movable contact 5 is reversed and the movable contact ( 5) is separated from the stationary contact 4 (trip operation).

In addition, in the earth leakage circuit breaker of FIG. 3, if an unbalance occurs in the main circuit current flowing through the primary conductor 31 due to the occurrence of a short circuit, the secondary circuit of the ZCT 13 is mounted on the printed circuit board 14. The trip signal is sent from the ground fault detecting circuit to the ground fault trip coil unit (not shown), and the trip bar 24 is driven by the operation of the ground fault trip coil unit to perform the trip operation in the same manner. In addition, the earth leakage trip coil unit is disposed in a space formed in the case 1 by cutting each L-side of the right pole side of the unit case 32, and acts on the right pole trip arm 24c of the trip bar 24.

According to the present invention, the following effects can be obtained.

(1) A common unit case in which a movable contactor, a latch of a contactor opening / closing mechanism, an opening / closing spring and a handle are assembled to each other, and an overcurrent tripping device of each pole, a trip bar linked to the tripping device, and a latch support A built-in trip device assembly unit is constructed, and each unit is inserted into a predetermined assembly position from above from the case of the mold container, and each unit is pushed from above by a cover covered by the case and held in place. According to the structure of Claim 1 assembled, it is possible to cope with an automated line in which an assembling robot is introduced instead of assembling work of a circuit breaker which was conventionally carried out depending on manual labor, thereby greatly improving productivity. In addition to reducing the manufacturing cost, in particular, the overcurrent trip device of each pole, the trip By combining trip bar and latch support linked to the device in a common unit case, the trip unit assembly unit is constructed, which reduces the number of steps and high assembly precision compared to the conventional configuration in which each part is separately installed and fixed in the breaker case. It is possible to secure the trip characteristic is stable.

(2) Furthermore, according to the structure of Claim 2 which arrange | positioned the ground fault detection ZCT applied to a main circuit conductor and an earth leakage breaker, and a printed circuit board on the upper side utilizing the unit case of this trip device assembly unit, a wiring circuit The circuit breaker can easily and flexibly respond to a circuit breaker of an earth leakage circuit breaker specification.

(3) Furthermore, by adopting the configuration of claims 3 to 5 as the positioning fixing means of the trip device assembling unit, the unit case with respect to the case (mold container of the circuit breaker), such as the load due to the tripping operation, etc. There is no fear of deviation from the predetermined assembly position by this, and this enables stable tripping operation by appropriately maintaining the relative positional relationship between the latch support built into the unit case and the latch of the contact opening / closing mechanism portion facing this. Product reliability is improved.

1 is an exploded perspective view showing a case of a circuit breaker according to an embodiment of the present invention, a contactor opening and closing mechanism unit, and a trip device assembly unit.

FIG. 2 is an assembled view of the circuit breaker according to the configuration of FIG. 1, (a) is a longitudinal cross-sectional view, and (b) is a plan view of a state where a cover is removed. FIG.

3 is an assembled view of the earth leakage breaker according to the configuration of FIG. 1, (a) is a longitudinal cross-sectional view, and (b) is a plan view of a state where a cover is removed.

4 is an exploded perspective view illustrating a temporarily assembled state of the contactor opening and closing mechanism unit in FIG. 1;

Fig. 5 is a perspective view of the movable contact in Fig. 4.

FIG. 6 is an explanatory view showing a procedure of connecting a movable contact to a latch in FIG. 4, (a) is a state during a connection operation, and (b) is a side view showing a state after connection; FIG.

7 is an external perspective view illustrating a unit case of the trip device assembling unit in FIG. 1.

8 is an enlarged view of an essential part showing a built-in state of a trip bar and a latch support when the unit case of FIG. 7 is viewed from the opposite side;

FIG. 9 is a perspective view of the trip bar in FIG. 8. FIG.

10 is an exploded perspective view showing a built-in procedure of the overcurrent trip device to the unit case of FIG.

FIG. 11 is an explanatory diagram showing a procedure when mounting an oil dash pot to the unit case in FIG. 10, wherein (a) and (b) correspond to the top and rib portions of the oil dash pot, respectively. FIG. drawing.

Fig. 12 shows an improved embodiment for inserting and tripping a trip device assembly unit into a case, wherein (a), (b) and (c) are a plan view, a side cross-sectional view and a partial cross-sectional front view of the unit case, respectively.

It is a figure which shows the state which incorporated the unit case shown in FIG. 12 in the case of a mold container, (a), (b), (c) is a top view and a side sectional view, respectively. Some cross section front view.

Fig. 14 is an enlarged view of the main part in Fig. 13, (a) shows a fastening state before the cover is attached and (b) after the cover is attached.

15 is a longitudinal cross-sectional view of a circuit breaker showing a conventional example.

Fig. 16 is an enlarged side view of the overcurrent trip device in the circuit breaker of Fig. 15.

<Explanation of symbols for main parts of drawing>

1: case

1a: Bearing part of contactor opening and closing mechanism unit

1b: support projection of the unit case

1c: support seat of the unit case

1d: standoff groove

2: cover

4: fixed contactor

5: operation contactor

10: overcurrent trip device

13: ZCT (Video Current Transformer)

14: Printed board of the ground fault detection circuit

19: handle

22: latch

24: trip bar

26: oil dash pot

32: unit case

32c: connecting piece

32d: protrusion

32e: fastening holes

32f: press-fit wall portion

33: opening and closing spring

34: latch support

50: contactor opening and closing unit

60: trip unit assembly unit

Claims (5)

An overcurrent trip device or an overcurrent trip device and an earth leakage trip device are incorporated into a mold container in which a lower case and an upper cover are combined, as connection terminals on the power supply side and the load side, fixed and movable contacts, and contact opening and closing mechanisms and trip means connected to the handle. In the circuit breaker which you configured, A contactor opening and closing unit unit assembled by connecting a movable contactor, a latch of the contactor opening and closing mechanism, an opening and closing spring, and a handle to each other; A unit case having an accommodating portion for accommodating an electric overcurrent trip device of an iron pole having an L-shaped yoke and an oil dash pot structure. Equipped with In the L-shaped yoke of the overcurrent trip device, a groove is formed to insert the top of the oil dash pot from one direction, and the yoke and the oil dash pot are press-fitted to the receiving portion of the unit case from the same direction, respectively. Providing a trip device assembly unit configured to support a trip bar and a latch support associated with the overcurrent trip device in the unit case, and inserting each of the units into a predetermined assembly position from above with respect to the case of the mold container; The circuit breaker further comprises pressing each unit from above to hold it in place by means of a cover on the case. The circuit breaker according to claim 1, wherein an earth leakage detection current transformer (ZCT) and a printed circuit board, which are applied to a main circuit conductor and an earth leakage breaker, are mounted on an upper portion of the unit case of the trip device assembly unit. 2. The position fixing means of the trip device assembling unit according to claim 1, wherein a connecting piece which is perforated in the unit case and an ear-shaped protrusion piece that is laterally expanded from the left and right ends are formed, and at the case side of the mold container. Forming a supporting support surface having a projection having the perforated connection piece and a support groove into which the projection piece is fitted, and pressing and holding the projection piece of a unit case incorporated in the case with a cover covered with the case; Circuit breaker characterized by. 4. The circuit breaker according to claim 3, wherein the left and right pairs of the perforated connection pieces are provided on the side facing the contact opening and closing mechanism unit built in the case of the mold container with respect to the unit case of the trip device assembly unit. 4. The circuit breaker according to claim 3, wherein a press-fitting wall portion overlapping with the wall surface of the unit insertion portion on the case side facing this is formed in front and rear end faces of the unit case of the trip device assembling unit.