KR101024183B1 - Circuit breaker - Google Patents

Abstract

Provides a large circuit breaker capable of performing smooth off operations.

The circuit breaker includes two fixed contacts 2A and 2B arranged in the left and right directions of the body, two movable contacts 4A and 4B having the movable contacts 3A and 3B fixed to the tip, and two movable contacts 4A. , 4B is provided with an opening and closing mechanism 5. The movable contact 4B is formed by a rigid conductive metal plate, is inserted from the side into the cutout groove 55 formed in the crossbar 40 constituting the opening / closing mechanism 5, and the partition wall is erected on the base member 1A. The shaft is rotatably supported by the shaft groove 63a formed in the 63. The coil spring 62B is compressed and disposed between the lower surface of the movable contact 4B and the bottom surface of the base member 1A. When the off operation is performed, the crossbar 40 is moved by the coil spring 62A. The movable contact 4B is urged in the clockwise direction by the coil spring 62B and rotated about the shaft groove 63a.

Description

Circuit breaker {CIRCUIT BREAKER}

The present invention relates to a circuit breaker.

Conventionally, the circuit breaker which contacts and isolates a movable contact and a fixed contact via an opening / closing mechanism by a handle on / off operation is provided (for example, refer patent document 1). The circuit breaker is provided with a crossbar which rotates in accordance with the on / off operation of the handle provided to protrude toward the front side of the body, and a movable contactor which moves in the front-rear direction (thickness direction) of the body as the crossbar rotates. By moving in the front-rear direction of the base, the movable contact fixed to the distal end of the movable contact and the fixed contact fixed to the base are brought into contact with and separated from each other.

Patent Document 1: Japanese Patent No. 3675467 (Paragraph-Paragraph [0088] and Figure 21-Figure 23)

In the circuit breaker shown in patent document 1 mentioned above, although the leaf spring is used as a movable contact in order to absorb the shock between a movable contact and a fixed contact at the time of turning on, for example, when a large electric current is supposed to flow, It is necessary to use a thick plate or the like as the movable contactor.

Here, the movable contact of the prior art is a relatively sliding movement of the inside of the cutout groove formed in the crossbar according to the rotation of the crossbar when contacting and separating the movable contact and the fixed contact, for example, using a thick plate as the movable contactor. In the case of using a coil spring having elasticity to apply the pressing force in the opening direction to the movable contactor, the movable contactor cuts out the inner surface of the incision groove smoothly when the crossbar is rotated by the handle off operation. There was a fear that the crossbar could not rotate well because it could not be made.

The present invention has been made in view of the above problems, and an object thereof is to provide a large capacity circuit breaker capable of performing a smooth off operation.

The invention as set forth in claim 1 is a contact portion comprising a load connection portion to which a load is connected and a power supply connection portion to which a power supply is connected, a fixed contact portion and a movable contact provided at a converter between the load connection portion and a power supply connection portion, and contacting and separating the contact portion. And a handle for contacting and separating the contact portion via the opening / closing mechanism by manipulating an operation portion exposed through a window hole formed in the front of the body, wherein the opening / closing mechanism is a movable contact made of a rigid body fixed to the front end of the movable contact. And a crossbar having a holding groove into which the movable contact member is inserted, which contacts or opens the movable contact of the movable contact held in the holding groove to the fixed contact by rotating between the on-rotating position and the off-rotating position according to the operation of the handle. Pressing the crossbar in the direction of opening the contact portion And a second spring attached to the spring and the movable contactor to pressurize the movable contactor in the direction of opening the contact portion, wherein the retaining groove is close to the rotation point of the crossbar while the crossbar is rotated from the on-rotation position to the off-rotation position. The cross section on the side is provided so as to be displaced in the opposite direction to the movable contact from the on-state position. When opening the contact portion, the crossbar is rotated by the pressing force of the first spring and the movable contact is contacted by the pressing force of the second spring. It moves to the negative opening direction. It is characterized by the above-mentioned.

The invention according to claim 2, wherein the movable contactor rotates about the rotation point in accordance with the rotation of the crossbar, the crossbar is disposed between the fixed contact point and the rotation point, and the second spring is provided on the rotation point side with respect to the crossbar.

According to the invention of claim 1, the side close to the point of rotation of the crossbar while the crossbar and the movable contact are pressed in the opening direction by the first and second springs, respectively, and the crossbar is rotated from the on-rotating position to the off-rotating position. Since the holding groove is formed so as to displace in the opposite direction to the movable contact from the on state of the cross section of the cross section, the movable contact does not cut out the inner surface of the holding groove when the crossbar is rotated from the on rotation position to the off rotation position. Since the smooth off operation can be performed and the contact portion can be opened quickly, the generation of the arc can be suppressed, and as a result, the contact life is long. In addition, since the movable contactor made of a rigid body is used, and the cross-sectional area can be increased as compared with the conventional one, the current capacity flowing through the movable contactor can be increased, and as a result, an electrical device with a large load current can be connected. .

According to the invention of claim 2, since the second spring is provided on the rotation point side instead of the fixed contact side, the distance between the second spring and the contact portion can be lengthened, even when an arc occurs at the opening of the contact portion. Therefore, there is an effect that the second spring can be prevented from melting due to heat caused by the arc.

Embodiment of this invention is described based on FIGS. The circuit breaker of the present embodiment is used, for example, as a protection switch that is mounted in a distribution board such as a house, and supplies power to a load to be connected, and cuts off the power supply when an abnormality occurs. In addition, although the circuit breaker of this embodiment is equipped with the contact structure of two poles, only one pole is demonstrated about the same structure in the following description. In addition, unless otherwise indicated in the following description, the direction of the arrow a-b in FIG. 4 will be described as an up-down direction, the direction of the arrow c-d as a left-right direction, and the direction of the arrow e-f as a front-back direction.

As shown in Figs. 1 to 4, the circuit breaker changes the height in the base 1 formed by opposing the base members 1A and 1B on the left and right sides made of synthetic resin so that the circuit breaker is perpendicular to the ground in Fig. 1 Two fixed contacts 2A, 2B, and movable contacts 3A, 3B opposing each other of these fixed contacts 2A, 2B so as to be able to contact and disconnect (i.e., contact or open separation). Two movable contacts 4A and 4B fixed and attached, and an opening and closing mechanism 5 for driving these two movable contacts 4A and 4B, and the opening and closing mechanism by the on / off operation of the handle 6 are provided. The movable contact 3A, 3B is contacted and separated from the corresponding fixed contact 2A, 2B via (5), and each fixed contact 2A, 2B and each movable contact 4A, 4B Is placed at different height positions in the vertical direction and interposed between the two fixed contacts 2A and 2B in the vertical direction. Each of the movable contacts 3A and 3B from each of the fixed contacts 2A and 2B, and the fixed contact 2A to which the movable contact 4B of the contactor and the movable contact 3A of the other movable contactor 4A contact and separate. It is arrange | positioned in the height position which does not cross | view from the width direction of the base 1 in this open state.

A partition member 7 made of a synthetic resin molded article is disposed inside the front and rear direction one end of the substrate 1 (the left side in FIG. 1) so as to be sandwiched between both the base members 1A and 1B. The terminal block 10B provided with the lower fixed contact 2B at one end is accommodated in the space comprised by the recessed part 9 provided in the left side, and the side wall (outer wall) of the base member 1B. In addition, one side of the upper fixed contact 2A is provided in a space formed by a recess (not shown) inside the side wall (outer wall) of the base member 1A on the right side and the longitudinal wall portion of the partition member 7. 10A provided in the terminal block is accommodated.

As shown in FIG. 1, the terminal block 10B has a terminal plate 11 bent in a substantially "c" shape in which one side surface (the surface on the gas member 1B side) is opened, and a lower member of the terminal plate 11. It is integral with the front end side of the extension member 11d which extends integrally upward from one end side of 11e, and the extension member 11c which extends integrally downward from the one end side of the lower member 11e of the terminal plate 11, and downward. An elongated fixed contact 12B, a fixed contact 2B caulking fixedly to an upper surface of one end of the fixed contact 12B, and a roughly mounted on the lower member 11e of the terminal plate 11 to be housed in the terminal plate 11. It consists of the locking spring 13B of a "m" shape. The terminal plate 11 mounts the lower member 11e on the horizontal wall portion 24 constituting the bottom portion of the recessed portion 9 of the partition member 7, and has a vertical wall (one end of the recessed portion 9) The extension member 11c is concave by fitting the one end of the terminal plate 11 to the notch formed between the lower end of the vertical wall 25 and the one end of the transverse wall 24 at the same time as the extension member 11d. When the partition member 7 overlaps each other on the side of the base member 1A, the front end portion of the fixed contact 12B, that is, the bottom surface provided with the fixed contact 2B, is disposed so as to extend out of the portion 9. It is mounted on the ribs 26 and 26 provided in the bottom part of the. At this time, the lower end of the fixed contact 2B protruding toward the lower surface side of the fixed contact 12B is disposed in the recess formed between the ribs 26 and 26. Moreover, the projection 23 which is inserted in the press member 13b of the locking spring 13B, and prevents rattling of the locking spring 13B is integrally formed in the side surface of the side piece of the terminal board 11. As shown in FIG.

The above-described locking spring 13B and the terminal plate 11 constitute a fastening terminal which is a conductor connecting portion, and the wire insertion hole 16B formed obliquely downward on one end side (left side in FIG. 1) of the base 1 in the front and rear direction. A core wire of an electric wire (not shown) inserted from the outside is connected between the upper member 11b of the terminal plate 11 and the upper end of the locking member 13a of the locking spring 13B and the upper end of the pressing member 13b. When the tip of the locking member 13a enters the core wire, the core wire is locked in the drawing direction of the electric wire, and the core wire is connected to the upper member 11b of the terminal plate 11 at the upper end surface of the pressing member 13b. By pushing, it is possible to connect the core wire electrically and to hold it mechanically.

Here, the release handle 17 is for releasing the above-described electric wire locking, and the release handle 17 has a pivot shaft (not shown) provided on the lower one side surface (the surface on the partition member 7 side). A shaft portion (not shown) which is axially rotatably supported by a shaft hole (not shown) provided in the longitudinal wall portion of (7) and protrudes on the inner side surface of the base member 1B is provided on the lower other side (gas member ( 1B), the shaft is rotatably supported by the concave portion 37 provided on the side of the side 1B, and is rotated in the counterclockwise direction in FIG. 1 by manually operating the operating portion 17a exposed to the outside of the base 1. In this case, the driving protrusion 19 provided on the lower end side is capable of pressing the tip of one end of the locking member 13a of the locking spring 13B to bend the locking member 13a, thereby releasing the locking to the core wire. have. In addition, the release handle 17 is always rotationally pressurized by the return spring (not shown) in the direction of clockwise rotation in FIG. Moreover, two release handles 17 are provided side by side in the left-right direction (direction perpendicular to the paper surface in FIG. 1) with the partition member 7 therebetween so as to correspond to each pole.

On the other hand, the terminal block 10A, like the terminal block 10B, consists of a terminal plate 11, a locking spring (not shown), and a fixed contact 12A in which a fixed contact 2A is caulked on the front end side. Although the terminal plate 11 of the terminal block 10A is different from the terminal plate 11 of the terminal block 10B, the extension member 11a extends upward from one end side of the lower member 11e. The fixed contact 12A is extended so that it is perpendicular to the extension member 11a from the upper end of the extension member 11a. This terminal block 10A mounts the lower member 11e of the terminal plate 11 on a bottom surface (not shown) inclined downward of the recessed portion of the base member 1A, and stands on one end side of the recessed portion. While arranging the extension member 11a along the wall (not shown), the fixed contact 12A is led out of the recess beyond the top of the standing wall, and stands up from the standing wall and the bottom of the gas member 1A. Terminal block 10A is arrange | positioned in the said recessed part by arrange | positioning the front-end | tip part of the fixed contact 12A on the fixed contact arrangement | positioning part 15 inclined similarly to the said bottom surface of the recessed part between the partition 14 provided, and integrally formed. do. At this time, the lower end portion of the fixed contact 2A protruding toward the lower surface side of the fixed contact 12A is disposed in the concave portion 15a formed on the upper surface of the fixed contact placing portion 15.

The locking spring of the terminal block 10A and the terminal plate 11 constitute a fastening terminal which is a conductor connecting portion as in the case of the terminal block 10B, and an electric wire insertion hole (not shown) formed obliquely downward on the rear side of the base 1. When the electric wire is inserted from the outside, the core wire is locked by the locking member of the locking spring, and the wire is pushed by the pressing member to the upper member 11b of the terminal plate 11 to electrically connect the electric wire and mechanically. It is supposed to lock.

Then, when releasing the above-described wire locking, similarly to the terminal block 10B, the driving projection 19 provided on the lower side when manually operating the operating portion 17a (see FIG. 4) to rotate in the counterclockwise rotation direction is provided. By pressing the tip of one end of the locking member of the locking spring, the locking member is bent to release the locking on the core wire. The load connection part is comprised by the terminal block 10A, 10B here, and the contact part is comprised by the fixed contact 2A, the movable contact 3A, and the fixed contact 2B, and the movable contact 3B.

Next, a connection terminal in which two conductive bars (not shown) disposed at different height positions in the distribution panel (not shown) are inserted and connected inside the other end side (right side in FIG. 1) of the base 1, respectively. The accommodating parts 90 and 90 which accommodate and arrange | position T1 and T2 are provided in the up-down direction side by side on the lower surface side of the base body 1. As shown in FIG. In addition, inserting portions 209a and 209b for inserting conductive bars formed by abutting substantially L-shaped cutout grooves formed over the end walls and the sidewalls of both base members 1A and 1B, respectively, are housed portions. It is provided corresponding to (90, 90). In addition, the insertion part 209a communicates with the upper housing part 90, and the insertion part 209b communicates with the lower housing part 90, respectively.

The connecting terminals T1 and T2 each have a substantially 'c' shape, and are formed of a transfer spring that extends over the tip after the front ends of the two sides parallel to each other are adjacent to each other, thereby expanding the tip to insert the conductive bar. At the same time, the conductive bar is sandwiched in the vicinity of the center. Here, the power supply connection part is comprised by connection terminal T1, T2, the accommodating part 90, and the insertion part 209a, 209b.

Here, the opening / closing mechanism 5 for opening and closing the movable contacts 4A and 4B includes a step-shaped locking portion for locking the operation plate 43 serving as a latch member, the crossbar 40 and one end of the operation plate 43. It consists of the drawing board 41 in which the 45 was formed, the handle 6, the link 44 of a substantially "C" shape, etc.

The handle 6 is comprised of the operation part 6a, the rotation part 6b, and the handle shaft 6c, and the handle member 6c which protruded in the center part of the both sides of the rotation part 6b has the base member 1A, 1B. It is hold | maintained between both base members 1A and 1B by rotatably inserting into the axial hole (not shown) formed in the inner side of the inside, and the operation part 6a is a base body in the state which opposes both base members 1A and 1B. It faces the window hole 50 formed in the upper surface of (1). In addition, a torsion spring (not shown) is attached to the handle shaft 6c, and the handle 6 is always pressed in the off operation direction by this torsion spring. In addition, as shown in FIG. 1, the lower end of the rotating part 6b is provided with a shaft hole 52 and connected to the operation plate 43 through the link 44 by inserting the upper shaft of the link 44 in a rotatable manner. do.

The operating plate 43 is connected to the handle 6 via the link 44 by passing the lower shaft of the link 44 through the bearing holes provided in the center portions on both sides in the left and right directions (the direction perpendicular to the ground in FIG. 1). It is arrange | positioned so that a vertical movement is possible in (1).

The crossbar 40 is inserted between both gas members 1A and 1B by inserting the shaft portion 40a which protrudes on both sides of the upper part into the shaft hole (not shown) formed in the inner side surfaces of the gas members 1A and 1B. As shown in FIG. 7, a cutout groove 54 into which the movable contactor 4A is inserted from the side is further provided on the side of the gas member 1A side slightly lower than the shaft portion 40a, and the lower gas member 1B. The cutout groove 55 into which the movable contact 4B is inserted from the side is provided in the side part of the side), respectively. And in the crossbar 40 in the cross section of one end side (left side in FIG. 1) in the front-back direction, the locking member 130 protruded to the partition member 7 and both base members 1A, 1B, respectively (in FIG. 1, Only the locking member 130 provided in the base member 1A] in the state in which the movable contacts 3A and 3B are separated from the respective fixed contacts 2A and 2B (the state shown in Fig. 2 or 3). The recessed groove 131 which hangs and inserts and contacts the bottom part is formed along the width direction.

In addition, the lower end of the crossbar 40 is pushed by the coil spring 62A compression-arranged between the lower end part and the partition 63 standing upright at the bottom part of the base member 1A, and in the direction of clockwise rotation in FIG. The rotating force is pressurized. Here, the crossbar 40 has the on-rotation position (position shown in FIG. 1) which the movable contacts 3A and 3B and the fixed contacts 2A and 2B contact, and the movable contacts 3A and 3B and the fixed contact. (2A, 2B) is rotatably held in the base 1 between the off-rotation positions (positions shown in FIG. 2 or 3) in which the openings are separated, and the cut-out groove 55 has the crossbar 40 turned on the on-rotation. Between rotating from the position to the off-rotation position, the cross section of the side closer to the rotation point (shaft part 40a) of the crossbar 40 is provided so that it may displace in the opposite direction to the movable contact 4B from the position of an on state. Here, the first spring is constituted by the coil spring 62A, and the retaining groove is constituted by the cut groove 55.

Here, the movable contact 4A is formed of a rigid conductive metal plate, is inserted from the side into the cutout groove 54 of the crossbar 40, and is provided with a recess 54a (front side) of the cutout groove 54 ( 7 is pressurized upward by a coil spring (not shown) for contact, which is compressed between the bottom of the bottom of the movable contact 4A and the bottom of the movable contact 4A, and the crossbar 40 moves the shaft 40a. At the time of rotation about the center, the movable contactor 4A rotates around the opening projection of the incision groove 54, and contacts or opens the movable contact 3A fixed to the free end with respect to the fixed contact 2A. It is supposed to be.

In addition, the movable contact 4B is formed of a rigid conductive metal plate similarly to the movable contact 4A, is inserted from the side into the cutout groove 55 of the crossbar 40, and the partition 63 of the gas member 1A. The shaft is rotatably supported by the shaft groove (63a) provided in the). In addition, one end side of the coil spring 62B, which is compressed and disposed between the bottom surface of the base member 1A, is fixedly attached to the lower surface of the movable contact 4B, and the shaft groove 63a is attached by the coil spring 62B. As a point, the rotational force in the clockwise direction is pressed in FIG. 1. Here, the crossbar 40 is disposed between the fixed contact 2B and the shaft groove 63a as shown in FIG. 2, and the coil spring 62B is disposed on the shaft groove 63a side with respect to the crossbar 40. It is. Then, when the crossbar 40 rotates in the clockwise direction, the movable contactor 4B rotates in the clockwise direction around the shaft groove 63a by the pressing force from the coil spring 62B, and the crossbar 40 ) Rotates in the counterclockwise direction in response to the pressing force from the coil spring 62B, and rotates around the shaft groove 63a in the counterclockwise direction, and the movable contact 3B fixed to the front end is caulked. Contact or open separation with respect to the fixed contact 2B. Here, the 2nd spring is comprised by the coil spring 62B, and the rotation point is comprised by the shaft groove 63a.

The lead plate 41 is integrally formed with a shaft portion 41a, a projection portion 41b that protrudes above the shaft portion 41a, and a corner portion 41c that projects below the shaft portion 41a. ) Is axially rotatably supported between both base members 1A and 1B by inserting the left and right end portions of each side into the axial hole (not shown) provided in the inner surfaces of both base members 1A and 1B. In addition, a locking portion 45 on which one end (the right end in FIG. 1) of the operating plate 43 is engaged is formed at the upper end of the protruding portion 41b, and a flat plate which is pressurized and driven by the bimetal 46 at the distal end side of the corner portion 41c. The part 41d protrudes in the left-right direction, and is provided. Moreover, the torsion spring 81 is attached to this lead-out plate 41, and is always pressurized by the torsion spring 81 in the counterclockwise rotation direction.

Next, as shown in FIG. 1, as for the electrically conductive plate 71B which consists of a thick plate metal material, the screw hole through which the adjustment screw 77 screw-engages is provided through one end side (right side in FIG. 1), and the other end side is provided. A pair of caulking shafts protrude from the lower surface. Then, the pair of caulking shafts are provided in a pair of holes through which the adjusting plate 72 made of a thin plate metal material having a substantially L-shaped bimetal 46 constituting the heat transfer release device is welded and fixed to one end thereof. It penetrates and penetrates, and is attached to the lower surface side of the electrically conductive plate 71B. In addition, the adjusting screw 77 is for changing the distance between the adjusting plate 72 and the conductive plate 71B, so that the lower end position of the bimetal 46, that is, the sensitivity of the heat transfer release device can be adjusted.

On the welded portion of the bimetal 46 with the adjustment plate 72, the other end side of the electric wire 79A, one end of which is connected to the connecting terminal T1, is welded, and the one end side of the braided wire welded to the movable contact 4B ( The other end side of 79C is welded to a substantially central portion in the vertical direction of the bimetal 46, and the connection terminal T1, the electric wire 79A, the conductive plate 71B, the bimetal 46, and the braided wire 79C The movable contact 4B is electrically connected. In addition, the other end side of the wire 79E having one end side connected to the connecting terminal T2 via the winding 68A and the wire 79B is already connected to the weld portion of the bimetal (not shown) adjustment plate on one electrode side. It welds, and the one end side is welded to the substantially center part in the up-down direction of the bimetal of the braided wire 79D welded to the movable contactor 4A, and it is a connection terminal T2, the electric wire 79B, the winding 68A, and an electric wire 79E, a conductive plate (not shown), bimetal, braided wire 79D, and movable contact 4A are electrically connected.

Here, the conductive plate 71B and the bimetal 46 are held by the partition member 31 interposed between the base members 1A and 1B. The partition member 31 is made of a synthetic resin molded article having an insulating property, and is provided with a substantially rectangular concave portion 31c through which a side surface (surface on the gas member 1B side) is opened, and the concave portion 31c is provided. The conductive plate 71B and the bimetal 46 are accommodated in the base 1 by press-fitting the conductive plate 71B into the base 1. In the present embodiment, a plurality of projections 31d (four in Fig. 1) are protruded and provided on the upper and lower surfaces of the recess 31c, and the conductive plate 71B is formed between these projections 31d. ), The conductive plate 71B and the bimetal 46 are held. Moreover, the notch part 31e for directing the adjustment screw 77 to the exterior is provided in the upper surface of the recessed part 31c, and a heat transfer release is performed by adjusting the adjustment screw 77 through this notch part 31e. The sensitivity of the device can be adjusted. In addition, since it is not necessary to adjust the adjusting screw 77 after the adjustment, the cutout portion 31e is closed by a cover (not shown), and the adjusting screw 77 is inadvertently operated, or foreign matter such as dust may be trapped. (1) Intrusion is prevented. In addition, between the base member 1A and the partition member 31, a bimetal plate and a bimetal of another tank are held by the partition member 31 in the same manner as the conductive plates 71B and the bimetal 46 described above. have.

Here, in the circuit breaker of this embodiment, the electromagnetic release part 47 which releases the said switching mechanism 5 and makes the said contact part open when a short-circuit current flows in the main circuit or a leakage current flows in a closed electrode state is provided. have. As shown in Figs. 1 and 6, the electromagnetic release portion 47 is a coil which is wound around the coil bobbin 69 and the coil bobbin 69 having a long and thin shape in the front-rear direction (left and right direction in Fig. 6). 68A and 68B, an image current transformer ZCT for detecting a leakage current flowing through the main circuit, and a secondary output generated in a secondary winding (not shown) of the image current transformer ZCT are input, The circuit board 73 in which the ground fault detection circuit which detects a leakage current based on a secondary output is provided.

The coil bobbin 69 is formed of an insulating material such as a synthetic resin, and provides the collar 69C at both ends and the middle portion in the axial direction (left and right direction in FIG. 6), and hoisting between each collar 69C. Drum parts 69A and 69B are provided side by side in the front-rear direction (left-right direction in FIG. 6). In the coil bobbin 69, a fixed iron core 57 made of a magnetic metal is attached to the front side (right side in FIG. 6), and a movable iron core 58 made of magnetic metal and movable in the axial direction on the back side. This storage is provided. Moreover, the release lever 58A of substantially L shape is attached to the front-end | tip (left end) of the movable iron core 58 when viewed from the cross section which engages with the protrusion part 41b of the drawing board 41 mentioned above. Further, a return spring 70 is attached to one end (right end in FIG. 6) of the release lever 58A, and the release lever 58A and the movable iron core 58 are always pressed to the rear (leftward direction in FIG. 6). have. That is, the position shown in FIG. 6 becomes the initial position (return position) of the release lever 58A and the movable iron core 58. As shown in FIG.

Here, the above-described winding 68A is wound around the hoisting drum section 69A of the coil bobbin 69, and one end side of the winding 68A is connected to the connection terminal T2 via the electric wire 79B. The other end side is connected to the movable contact 4B via a wire 79E or the like. On the other hand, the above-described winding 68B is wound around the hoisting drum section 69B, and both ends of the winding 68B are connected to an output circuit (not shown) formed on the circuit board 73. That is, in the circuit breaker of this embodiment, the windings 68A and 68B are wound side by side in the axial direction of the coil bobbin 69, and the windings 68A and 68B are clockwise in the same direction (viewed from the rear side in this embodiment). In the direction of rotation).

In the image current transformer ZCT, wires 79A and 79E constituting the paths of both voltage poles pass through the through-hole provided in the center, and when the leakage current flows through the main circuit, an unbalanced current flows through the image current transformer ZCT. Secondary output occurs in the winding. The secondary output is input to the circuit board 73, and when the input secondary output is compared with a predetermined threshold by the ground fault detecting circuit, and it is determined that a leakage current larger than the reference value flows, the output circuit is wound by the output circuit ( 68B) is intended to be energized.

Here, in the circuit breaker of this embodiment, the upper surface side which arises by arrange | positioning the connection terminal T1, T2, the accommodating part 90, and the insertion part 209a, 209b which comprise a power supply connection part to the lower surface side of the base | substrate 1 The circuit board 73 and the coil bobbin 69 constituting the electromagnetic release portion 47 are disposed in the space of the space.

Next, the assembly method of the circuit breaker of this embodiment is demonstrated. In addition, in the following description, electric wires 79A, 79B, 79E, and braided wires 79C, 79D are assumed to be fixed and attached to a predetermined position in advance. First, the terminal block 10A is accommodated in the recess of the base member 1A on the right side, and the release handle 17 is assembled together with the return spring at a predetermined position. Further, the handle 6 is assembled together with the torsion spring at a predetermined position. Thereafter, the movable contact 4A is inserted into the cutout 54 of the crossbar 40, the coil spring is accommodated in the recess 54a, and the crossbar 40 is positioned at a predetermined position with the base member 1A side. It is arrange | positioned so that rotation with the coil spring 62A is possible. In addition, the operation plate 43 is connected to the handle 6 using the link 44 and disposed at a predetermined position.

Thereafter, the connection terminals T1 and T2 are accommodated in the storage units 90 and 90 provided on the other end side (right side in FIG. 1) of the base 1, respectively, and the rear surfaces of the connection terminals T1 and T2 are respectively accommodated. The video current transformer ZCT is housed on the side (left side in FIG. 1), and the circuit board 73 and the windings 68A, 68B are wound in a space above the connection terminals T1 and T2 and the video current transformer ZCT. The coil bobbin 69 is stored.

Next, the movable contactor 4B is inserted into the cutout groove 55 of the crossbar 40, and the shaft contact 63a provided near the bent portion of the movable contactor 4B is axially supported in the partition wall 63 to further support the coil. One end side of the spring 62B is fixedly attached to the movable contact 4B and the other end side is fixedly attached to the bottom of the base member 1A.

Thereafter, the partition member 31 is accommodated in the base 1A, and the conductive plate 71B is press-fitted into the recessed portion 31c of the partition member 31, so that the conductive plate 71B and the bimetal 46 are formed. The partition plate 31 is held and the lead plate 41 is rotatably disposed together with the torsion spring 81 to a predetermined position.

In this way, parts other than the return spring of the partition block 7, the terminal block 10B accommodated in the recessed part 9 of the partition wall member 7, the release handle 17, and the release handle 17 are replaced with the base member 1A. After assembling on the) side, the partition member 7 in which the terminal block 10B, the release handle 17 and the return springs of the release handle are assembled in the recess 9 is disposed so as to overlap the base 1A side.

And from this state, the gas member 1B overlaps and joins on the gas member 1A side. At this time, the phosphorus hook portion 101 at the tip of the three elastic locking members 100 protruding from the base member 1A side to the base member 1B side is provided corresponding to the base member 1B side. When each is locked to a ruled part (not shown), the base member 1A and the base member 1B are combined to assemble the base 1. On the contrary, in the case of separating the base member 1B from the base member 1A, a driver (not shown) from each release hole 150 (see FIG. 4) of the base member 1B opened in correspondence with the edge portion. Press the pressing portion 101 of the corresponding elastic locking member 100 upwards or downwards, and releases the substrate member 1B from the base member 1A by releasing the pulling position with the target portion. Can be.

Here, the initial position of the bimetal 46 is adjusted by moving the adjusting screw 77 disposed toward the cutout portion 31e in the up and down direction using a tool, and after adjustment, the cover is attached to the cutout portion 31e. Occupies.

By the way, as shown in FIG.4 and FIG.5, the protrusion part 105 in which the insertion through-hole 105a was penetrated is provided in the upper surface by the side of the base member 1B, and the test button for similarly generating a short circuit state is provided. 78 has exposed the tip part upward from the insertion through-hole 105a. Then, the test button 78 is pressurized to enter a short-circuit state so that the trip operation described later can be confirmed.

Next, operation | movement of the circuit breaker of this embodiment is demonstrated based on FIG. FIG. 2 shows an off state. In this off state, the operation part 6a of the handle 6 is in an inverted state from the window hole 50, and the operating plate 43 and the extraction plate 41 are coupled to each other. The state is in the released state. The crossbar 40 is pressurized to rotate in the clockwise direction in FIG. 2 by the coil spring 62A, and the movable contact 4A penetrated into the cutout groove 54 of the crossbar 40 has a free end [ Movable contact 3A side] is in the state which moved upward, and movable contact 4B which penetrated in cutout groove 55 is free end (movable contact 3B side) by the pressing force from coil spring 62B. ] Is moving upward. That is, each movable contact 3A, 3B is in the state isolate | separated from the corresponding fixed contact 2A, 2B, respectively.

In this state, when the operation part 6a of the handle 6 is rotated in the clockwise direction, the upper axis of the link 44 is pressed and driven downward, and the link 44 is operated by the lower axis. Slide down). When the operation plate 43 is pushed down, one end (right end in FIG. 1) of the operation plate 43 contacts the locking portion 45 of the drawing plate 41, and the operation plate 43 rotates this contact portion. It rotates in the direction of counterclockwise rotation about the center, the other end (left end in FIG. 1) contacts the protrusion part 84 provided in the upper end of the crossbar 40, and makes the crossbar 40 apply to the pressing force from the coil spring 62A. Resist and rotate in the direction of counterclockwise rotation.

The movable contact 4B penetrated into the cutout groove 55 of the crossbar 40 by this rotation rotates in the counterclockwise direction against the pressing force from the coil spring 62B, and the movable contact provided on the free end side. 3B is brought into contact with the fixed contact 2B. In addition, the movable contact 4A penetrated in the cutout 54 rotates in the counterclockwise direction similarly to the movable contact 4B, and the movable contact 3A provided at the free end thereof contacts the fixed contact 2A. Let's do it.

When the handle 6 is rotated further in the clockwise direction, the upper axis moves to the left side as shown in FIG. 1 than the line forming the position of the lower axis of the link 44 and the rotation center of the handle 6. In this state, the torsion spring of the handle 6, the coil spring 62A for pressing the crossbar 44, the elastic force of the coil spring 62B for pressing the movable contact 4B, and the like are balanced. The latch state of the one end and the latching portion 45 of the lead-out plate 41 is held, and the on state shown in FIG. 1 is held.

Next, when the operation part 6a of the handle 6 is rotated in the counterclockwise direction in the on state, the position of the upper axis of the link 44 forms the line forming the lower axis with the rotational center of the handle 6 in the right direction. Since it moves upward, the latch state of the right end of the operating plate 43 and the locking portion 45 of the lead-out plate 41 is released, and the crossbar 40 rotates clockwise by the pressing force of the coil spring 62A. At the same time, the handle 6 is rapidly rotated to the off side by the pressing force of the torsion spring. By the rotation of the crossbar 40 in the clockwise direction, the movable contactor 4A rotates in the clockwise direction to move the free end upward, and the movable contact 3A is opened and separated from the fixed contact 2A. Further, the movable contact 4B rotates in the clockwise direction with the shaft groove 63a as the rotation center by the pressing force from the coil spring 62B to move the free end upward, and the movable contact 3B is fixed to the fixed contact. Open separation from (2B).

Here, when an excessive load current flows through the bimetal 46 in the on state shown in FIG. 1, the bimetal 46 generates heat due to the overcurrent and is curvedly displaced. In this embodiment, the lower end of the bimetal 46 is displaced so as to move to the rear side (left direction in FIG. 1), and the flat plate portion 41d of the lead plate 41 is pushed to the left side, and the lead plate 41 is pulled out by this pressing force. ) Rotates around the shaft portion 41a in the clockwise direction.

Then, when the takeout plate 41 rotates in the clockwise direction, the latching state of the locking portion 45 of the takeout plate 41 and one end (right end) of the operation plate 43 is released, and the operation plate 43 is rotated. Rotates in the clockwise direction about the lower axis of the link 44. Therefore, the restriction of the crossbar 40 by the other end (left end) of the operating plate 43 is eliminated, and the crossbar 40 is rotated in the clockwise direction by the elastic force of the coil spring 62A, and is shown in FIG. As shown in the figure, the movable contacts 4A and 4B are returned to the off state, and the movable contacts 3A and 3B are opened and separated from the fixed contacts 2A and 2B, respectively.

After that, the bimetal 46 is returned to its original state by disconnection of the converter, and the extraction plate 41 is rotated and returned to its original position by pressurization of the torsion spring 81. Further, the handle 6 is rotated in the off direction (counterclockwise direction) by the pressure of the torsion spring.

In addition, when an excessive current such as a short-circuit current flows in the winding 68A wound on the coil bobbin 69 in the on state shown in FIG. 1, the magnetic force is applied to the fixed iron core 57 constituting the electromagnetic release portion 47. Is generated and the movable iron core 58 is sucked in the right direction. In doing so, the release lever 58A attached to the movable iron core 58 pulls the projection 41b of the lead-out plate 41 forward (in the right direction in FIG. 6) against the pressing force of the return spring 70, The lead plate 41 rotates in the clockwise direction about the shaft portion 41a.

Then, as in the case where the excessive load current flows, when the extraction plate 41 rotates in the clockwise direction, the latching state of the locking portion 45 of the extraction plate 41 and one end (right end) of the operation plate 43 is changed. Is released, and the operating plate 43 is rotated in the clockwise direction about the lower axis of the link 44. Therefore, the restriction of the crossbar 40 by the other end (left end) of the operating plate 43 is eliminated, and the crossbar 40 is rotated in the clockwise direction by the elastic force of the coil spring 62A, and the movable contactor ( 4A and 4B are returned to the off state, and the movable contacts 3A and 3B are opened and separated from the fixed contacts 2A and 2B, respectively.

Then, when the magnetic force does not generate | occur | produce in the fixed iron core 57 of the electromagnetic release part 47 by a converter interruption, the movable iron core 58 and the release lever 58A are returned to the original state by the elastic force of the return spring 70. It returns and the drawing board 41 rotates back to an original position by the pressurization of the torsion spring 81. FIG. Further, the handle 6 is rotated in the off direction (counterclockwise direction) by the pressure of the torsion spring.

In addition, when a leakage current flows in the main circuit in the on state shown in FIG. 1, an unbalanced current flows in the image current transformer ZCT, and a secondary output is generated in the secondary winding. The winding 68B is energized by this. When the winding 68B is energized, a magnetic force is generated in the fixed iron core 57 constituting the electromagnetic release portion 47 to suck the movable iron core 58 in the right direction. In doing so, the release lever 58A attached to the movable iron core 58 pulls the projection 41b of the lead-out plate 41 forward (rightward direction in FIG. 6) against the pressing force of the return spring 70, The lead plate 41 rotates in the clockwise direction about the shaft portion 41a.

When the drawer plate 41 rotates in the clockwise direction as in the case where a short circuit current flows, the latch state of the locking portion 45 of the drawer plate 41 and one end (right end) of the operation plate 43 is released. The operating plate 43 is rotated in the clockwise direction about the lower axis of the link 44. Therefore, the restriction of the crossbar 40 by the other end (left end) of the operating plate 43 is eliminated, and the crossbar 40 is rotated in the clockwise direction by the elastic force of the coil spring 62A, and the movable contactor ( 4A and 4B are returned to the off state, and the movable contacts 3A and 3B are opened and separated from the fixed contacts 2A and 2B, respectively.

Then, when the magnetic force does not generate | occur | produce in the fixed iron core 57 of the electromagnetic release part 47 by a converter interruption, the movable iron core 58 and the release lever 58A are returned to the original state by the elastic force of the return spring 70. It returns and the drawing board 41 rotates back to an original position by the pressurization of the torsion spring 81. FIG. Further, the handle 6 is rotated in the off direction (counterclockwise direction) by the pressure of the torsion spring.

In the circuit breaker of the present embodiment, the crossbar 40 is pressed in the opening direction by the coil spring 62A, the movable contact 4B is pressed in the opening direction by the coil spring 62B, and the crossbar 40 is further pressed. While rotating from the on-rotation position to the off-rotation position, the cross section on the side near the rotation point (shaft portion 40a) of the crossbar 40 is cut away from the on-state position in the opposite direction to the movable contact 4B. Since the groove 55 (holding groove) is formed, when the crossbar 40 is rotated from the on-rotation position to the off-rotation position, the movable contactor 4B does not cut out the inner surface of the cut groove 55 without being smooth. Since the one-off operation can be performed and the contact portion can be opened quickly, the generation of the arc can be suppressed, resulting in a long contact life. In addition, since the movable contactor 4B made of a rigid body is used, and the cross-sectional area can be increased in comparison with the prior art, the current capacity flowing through the movable contactor 4B can be increased. I can connect it.

Moreover, since the coil spring 62B is provided in the shaft groove 63a side which is a rotation point rather than the fixed contact 2B side, the coil spring 62B and a contact part (fixed contact 2B and movable contact 3B) Since the distance between them can be made long, even if an arc generate | occur | produces at the time of opening of a contact part, it can prevent that the coil spring 62B melt | dissolves by the heat by this arc.

1 is a side view showing a closed electrode state of a circuit breaker according to the present embodiment, with the gas member on the left side removed;

2 is a side view of the open state of the present embodiment, in which the gas member on the left is removed;

3 is a side view of a state in which a tripping state of the present embodiment is shown, and the body member on the left side is removed;

4 is a perspective view of the present embodiment;

5 is a right side view of the present embodiment;

6 is a partially broken cross-sectional view of the present embodiment as seen from below;

7 (a) and 7 (b) are perspective views of a crossbar used in the present embodiment.

[Description of Reference Numerals]

 1: base 1A, 1B: base member

2A, 2B: fixed contact 3A, 3B: movable contact

4A, 4B: movable contact 5: opening and closing mechanism

6 handle 6a control panel

40: crossbar 50: window hole

55: incision groove (holding groove) 62A: coil spring (first spring)

62B: coil spring (second spring)

Claims (2)

A body provided with a load connecting portion to which a load is connected and a power connecting portion to which a power source is connected, A contact portion comprising a fixed contact and a movable contact provided in a converter between the load contact and the power supply contact; An opening and closing mechanism for contacting and separating the contact portion; A handle for contacting and separating the contact portion via the opening / closing mechanism by operating the operation portion exposed through the window hole formed in the front surface of the body, The opening / closing mechanism has a movable contact made of a rigid body having the movable contact fixed to a distal end thereof, and a holding groove into which the movable contact is inserted. A crossbar for contacting or opening the movable contact of the movable contact held in the groove with the fixed contact, a first spring for urging the crossbar in a direction of opening the contact portion, and attaching to the movable contact A second spring pressurizing the movable contact in a direction to open the contact portion; The holding groove is displaced in a direction opposite to the movable contact from the position where the end face of the side close to the rotation point of the crossbar is turned on while the crossbar is rotated from the on-rotation position to the off-rotation position. When opening the contact portion, the crossbar is rotated by the pressing force of the first spring, and the movable contact is moved in the opening direction of the contact portion by the pressing force of the second spring. Circuit breaker. The method of claim 1, The movable contact rotates about a rotation point according to the rotation of the crossbar, the crossbar is disposed between the fixed contact point and the rotation point, and the second spring is provided on the rotation point side with respect to the crossbar. By Circuit breaker.

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