KR930006825Y1 - Circuit breaker - Google Patents

Abstract

No content.

Description

Electrical circuit breaker

1 is a plan view of a molded case circuit breaker.

2 is a side view of a circuit breaker.

3 is an enlarged cross sectional view of the circuit breaker taken along line 3-3 of FIG.

4 is an enlarged plan sectional view taken along line 4-4 of FIG.

5 is an enlarged cross sectional view taken along line 5-5 of FIG.

6 is an enlarged partial cross-sectional view of the center pole of the circuit breaker taken along line 6-6 of FIG.

7 is an enlarged cross sectional view taken along line 7-7 of FIG.

FIG. 8 is a view similar to FIG. 6 taken along line 8-8 of FIG.

FIG. 9 is a view similar to FIG. 6 taken along line 9-9 of FIG.

FIG. 10 is a view similar to FIG. 6 taken along line 10-10 of FIG.

11 is an enlarged partial cross-sectional view taken along line 11-11 of FIG.

12 is an enlarged exploded perspective view of a portion of the operating mechanism of the circuit breaker.

13 is an enlarged perspective view of a circuit breaker trip bar.

14 is an enlarged partial cross-sectional view of the center pole showing the circuit breaker in the open position.

FIG. 15 is a view similar to FIG. 14 showing the circuit breaker in its tripped position.

16 is an enlarged plan view of the arc gas discharge device according to the present invention.

FIG. 17 is an enlarged partial side view of FIG.

FIG. 18 is an enlarged partial cross sectional view taken along line 18-18 of FIG.

19 and 20 show enlarged front views of valves used in the apparatus of FIGS. 16-18.

* Explanation of symbols for main parts of the drawings

30: circuit breaker 50: bottom contact

52: upper contact 54: arc chute

58: operating mechanism 410: one-way valve

412: outlet 414: post

The present invention generally relates to a circuit breaker in the form of a mold case, and more particularly to an arc gas discharge device of the circuit breaker.

Typically, the arc gas occurring between the discrete contacts in the circuit breaker is discharged through an opening formed in the wall portion of the insulating case or housing of the circuit breaker.

In this case, if the amount of arc gas is too small, structural damage to the circuit breaker case may occur due to an internal explosion, and if the amount of arc gas is too large, external flashovers may be caused. This conventional problem is particularly aggravated by the smaller size of the circuit breaker having a set current interruption capacity.

Another problem with discharging arc gas is that side effects occur as environmental pollutants enter the circuit breaker housing through the outlet.

Therefore, the main object of the present invention is to solve the above problems, and according to the present invention has an insulating housing of the circuit breaker, a contact and a mechanism for opening or closing the contact, the insulation to release the arc gas A circuit breaker having at least one gas ejection device with a housing formed in the wall thereof, wherein the gas discharge device is provided with a one-way valve in response to pressure to allow the arc gas to be discharged out of the housing and into the housing. It is blocking the entry of pollutants. In a preferred embodiment, the gas discharge device of the present invention has a pair of outlets that extend side by side through the wall of the circuit breaker housing and are separated from each other by posts, elastically bent around the posts and inserted into each outlet. The opposing surface portion of the post includes an extended resilient valve member that acts as a one-way valve of a flapper type.

Preferred embodiments of the present invention are described by way of example only with reference to the accompanying drawings.

First, referring to FIGS. 1 to 15 in the figure, the circuit breaker 30 is provided with three poles or closed phases. In particular, it should be understood that the preferred embodiments of the present invention, which will be described below with reference to FIGS. 16-20, may equally be applied to not only alternating current and direct current circuit breakers, but also other polyphase or single phase circuit breakers.

The circuit breaker 30 includes an electrically insulated and molded top cover 32 and a base or bottom cover 34 that is mechanically fixed to the top cover by a plurality of screws 36. Also, a plurality of first electrical terminals or line terminals 4th diagrams 38A, 38B, and 38C are installed in each pole or phase, and a plurality of second electrical terminals or load terminals 40A, 40B, and 40C are provided. The same is installed. These terminals are used by the circuit breaker 30 to connect in turn to the three phase electrical circuit to protect the three phase electrical system.

The circuit breaker 30 also has a manually operated handle 42 that is electrically insulated and extended, the manual handle 42 extending through the opening 44 in the top cover 32 so that the circuit breaker 30 can be removed. It can be fixed in the closed position of 3 degrees or the open position of 14 degrees. The circuit breaker 30 can also go to the flipped open position, which is the dotted line position of FIG. 3, or the trip position of FIG. After the circuit breaker 30 is raised to its trip position, the circuit breaker 30 moves the handle 42 from the trip position (FIG. 15) from the trip position (FIG. 15) to the open position (FIG. 14). I can set it.

The handle 42 can then remain in its open position or move to its closed position. In this case, the circuit breaker 30 is in a ready state for the subsequent protection. The movement of the handle 42 can be done manually or automatically by a machine operator. Preferably, an electrically insulating strip 46 capable of interlocking with the handle 42 covers the bottom of the opening 44 and acts as an electrical insulator between the outside and inside of the circuit breaker 30.

The circuit breaker 30 includes a lower contact 50, an upper contact 52, an arc chute 54, a slot motor 56, and an operation mechanism 58 as important internal parts thereof. The arc chute 54 and slot motor 56 are well known in the art and will not be described in greater detail herein. In short, the arc chute 54 serves to limit the magnitude of the fault current by dividing the electrical single arc generated in the fault condition between the separated contacts 50 and 52 into a series of arcs and raising the overall arc voltage. On the other hand, a slot motor 56 contained in an insulator and composed of a series of U-shaped steel plates or U-shaped insulated rigid bars is disposed near the contacts 50 and 52 to generate a high level short circuit or fault current. The magnetic field is focused, thereby greatly increasing the magnetic repulsive force between the contacts 50 and 52 being separated, thereby accelerating the separation action of the contacts 50 and 52.

The quick disconnection of the contacts 50 and 52 results in a very high arc resistance which limits the magnitude of the fault current. Here, for more detailed description of the arc chute 54 and the slot motor 56, see US Patent No. 3,815,059.

The lower contact point 50 shown in FIGS. 3, 4 and 11 includes a lower fixing member 62 fixed to the base 34 with a screw 64, a lower movable contact arm 66, 1 Between the pair of contact crimp springs 68, the lower contact inclination device or the compression spring 70, the contact 72 in contact with the upper contact 52, and the upper contact 52 and the lower contact 50 portions. Insulation strips 74 are included to reduce arcing that may occur. The line terminal 38B extending out of the base 34 includes the end of the member 62 as a component. The member 62 includes a slanted portion 62A which provides a stop or lower limit position during the operation in which the contact arm 66 is bent and opened, and a recess 76 formed in the base 34 to seat the compression spring 70. The aperture 62B is placed on the upper side, and the lower flat portion 62C through which the aperture 62B is formed.

In addition, the lower flat portion 62C has a screwed aperture 62D that can be penetrated to accommodate the screw 64, and fixes the fixing member 62 to fix the lower contact 50 to the base 34. Let's go.

The holding member 62 includes a pair of spaced apart, upright and usually U-shaped bent contacts 62E and 62F. The contacts 62E and 62F have two spaced apart and flat inclined surfaces 32G and 62H, respectively, which are inclined at an angle of about 45 ° to the plane of the lower flat portion 62C and the inner surfaces of the contacts 62E and 62F. Extend across each other. The stop member 62J (FIG. 4) is provided to limit the upward movement of the contact arm 66. As shown in FIG.

The contact arm 66 is firmly fixed to the rotation pin 78 (FIG. 11) so that it can rotate in the inclined contact portions 62E and 62F near the longitudinal axis of the rotation pin 78. As shown in FIG. Rotating pin 78 includes circular contact portions 78A and 78B extending outwardly, which contact portions 78A and 78B are inclined by compression springs 68 to contact the inclined surfaces of contacts 62F and 62E, respectively. Resulting in a current conduction effect. In this way, current conduction is made between the fixed member 62 formed below and the lower movable contact arm 66 through the rotary pin 78. The lower movable contact arm 66 is compressed to maintain an effective contact between the lever arm 66A extending between the rotary pin 78 and the contact 72 and the lower movable contact arm 66 and the compression spring 70. A downward projection or spring locator 66B is included to receive the upper end of the spring 70. Finally, the lower movable contact arm 66 includes, as a component, a flat surface 66 formed to contact the stop member 62 at its lower end, thereby restricting the lower movable contact arm 66 from moving upward. The contact 72 is firmly fixed to its flat surface.

The lower contact 50 as described above uses the high magnetic repulsion force generated by a high level short circuit or fault current flowing through the elongated parallel portions of the contacts 50 and 52 so that the contact arm 66 is compressed by the compression spring 70. Allows fast downward movement against the convenience of). Thus, a very fast separation of the contacts 50 and 52 and a rapid resistance increase of the electric arc occurring between the contacts are achieved and the fault current can be efficiently limited in a relatively small space. The bottom contact 50 also does not have to use the flexible copper sorting used in conventional mold case circuit breakers. The use of compression springs 68 effectively provides a current path between terminal 38B and contact 72 to provide a constant bias for pin 78, while lower contact 50 is in a small, compact area. Enable to install

The actuation mechanism 58 includes a central upper toggle mechanism 80, a trip mechanism 82, a integrally formed crossbar 84 (FIG. 12), a pair of spaced opposing metal side plates 86, a rotatable metal A sieve handle yoke 88, a stop pin 90 and a pair of actuation elongation springs 92 are included.

The upper center toggle mechanism 80 includes a cradle 96 of metal body pivotable about the central axis of the cradle support pin 98. Opposite ends of the cradle support pins 98 are held in a pair of apertures 100 that penetrate the side plates 86 in their assembled state.

The toggle mechanism 80 also includes a pair of upper toggle links 102, a pair of lower toggle links 104, a toggle spring pin 106 and an upper toggle rank successor pin 108. The lower toggle link 104 is fixed to the upper contact 52 by the toggle contact pin 110. Each lower toggle link 104 has a lower aperture 112 that can receive a toggle contact pin 110. The toggle contact pin 110 penetrates the aperture 114 formed through the upper contact 52 such that the upper contact 52 can freely rotate about the longitudinal axis of the pin 110. Opposite ends of the pins 110 are received and held in the crossbar 84. Therefore, the movement of the upper contact 52 is lower than the high voltage short circuit or the fault current state, and the movement of the corresponding crossbar 84 is made in accordance with the movement of the lower toggle link 104. In this way, the movement of the top contact 52 caused by the operating mechanism 58 in the center pole or phase through the crossbar 84 simultaneously causes the top contact 52 to be connected to another pole or phase of the circuit breaker 30. Let it move

Each lower toggle link 104 also includes an upper aperture 116, and each upper toggle link 102 includes an aperture 118. The pin 106 penetrates through the apertures 116 and 118 to interconnect the upper and lower toggle links 102 and 104 and to rotate between them.

The opposite end of the pin 106 includes a journal 120 that receives a hooked bent end 112 under the spring 92. The upper hook end 124 of the spring 92 is received and held in a slot 126 formed in the upper plane 128 of the handle yoke 88. At least one spring 92 of the slots 126 associated with each spring 92 positions the bent end 124 of the spring 92 to minimize or prevent mutual movement along the length of the slot 126. And a recess 130 for the purpose of operation.

In the assembled state, the links 102 and 104 engage the pins 106 with positioning the bent end 124 in the slot 126 and positioning the bent end 122 in the journal 120. And the spring 92 acts on the upper center toggle mechanism 80 under tension so that it can cope with and control the external motion of the handle 42.

The upper link 102 also includes a recess or groove 132 for receiving and retaining by a pair of spaced journals 134 formed along the length of the fin 108. The central portion of the pin 108 is formed to be accommodated in the aperture 136, the aperture 136 penetrates the cradle 96 located at a distance from the rotation axis of the cradle 96 Is formed.

The tension of the spring 92 keeps the pin 108 engaged with the upper toggle link 102. Thus, the rotational movement of the cradle 96 results in a corresponding movement or spacing above the link 102. The cradle 96 includes a slot or groove 140 having an inclined flat latch surface 142. do. The surface 142 is configured to engage an inclined flat plate cradle latch surface 144 formed at the upper end of the elongated aperture 146, which is usually formed through a flat intermediate latch plate 148.

The cradle 96 is also configured to contact a downwardly latched elongated surface 152 formed along one edge of the upper surface 128 of the handle yoke 88. The actuating spring 92 moves the handle 42 during the trip operation, and the surfaces 150 and 152 place the handle 42 in the trip position (FIG. 15), which is the closed position of FIG. It is close to the open position and shows that the circuit breaker 30 has tripped. Moreover, the engagement relationship of the surfaces 150 and 152 is such that the actuation mechanism 58 is moved after the tripping operation by moving the cradle 96 clockwise against the biasing force of the spring 92 from its tripping position (FIG. 15). Is reset and moved back and forth from its open position (FIG. 14) to allow recombination of surfaces 142 and 144.

The cradle 96 also typically has a flattened and extended stop surface 154 to be brought into contact with the protruding or hard stop 156 disposed around the arc in an arc formed around the center of the stop pin 90. The engagement of the stop surface 154 and the stop 156 limits the movement of the cradle 96 in the counterclockwise direction following the trip operation. The cradle 96 maintains contact with the outermost edges of the inclined latch surface 144 of the intermediate latch plate 148 when the latch surfaces 142 and 144 disengage during the trip operation (FIG. 15). A curved intermediate latch plate subsequent surface 157 for the purpose. In addition, the cradle 96 is provided with a pushing surface of the kicker 158 to be engaged with the contact surface 160 formed on the pin 106 when the cradle 96 is released, the open position (first 3) the upper contact 52 is quickly lifted away from the lower contact 50 by quickly pushing the pin 106 counterclockwise to the trip position (FIG. 15).

During this tripping operation, the enlarged portion or protrusion 162 formed on the upper toggle link 102 contacts the stop 156 with the enormous amount of force provided by the spring 92 via the rotating cradle 96. By being configured to be able to accelerate the turning operation of the upper toggle link 102, the toggle spring pin 106 and the lower toggle link 104. In this way, the operating speed or response time of the actuation mechanism 58 is greatly increased.

The trip mechanism 82 includes an intermediate latch plate 148, a rotatable handle yoke latch 166, a torsion spring spacer pin 168, a overlapping torsion spring 170, and a trip bar 172 integrated with a mold; FIG. 13), an amateur 174, an amateur beetle spring 176, a magnet 178 and a bimetal 180, and a conductive member or heater 182. The bimetal 180 is electrically connected to the load terminal 40B through the conductive member 102. The magnet 178 substantially surrounds the bimetal 180 to constitute a magnetic circuit for reacting to a short circuit or a fixed current state. The armature stop plate 184 has a downward locking jaw portion 186 to engage the upper end of the amateur 174, which limits movement in the counterclockwise direction. Torsion spring 176 has an end portion in the form of a spring arm 188 that is elongated to incline the upper side of armature 174 against clockwise movement.

Opposite end portions 190 disposed upward of torsion spring 176 are disposed in one of a plurality of apertures (not shown) spaced apart with a gap formed through the upper surface of plate 184. The spring tension of the spring arm 188 can be adjusted by positioning the end of the torsion spring 176 to one of the different apertures formed through the upper surface of the support plate 184.

The bimetal 180 includes a lower end 192 spaced apart from the lower end of the contact leg 194 hanging downward of the trip bar 172 (FIG. 3). When the circuit breaker 30 is placed in the closed position, the gap between the lower end 192 and the leg 194 causes the circuit breaker 30 to convert the reaction time to overload by turning the appropriate set screw 196. , Which is installed in the aperture 198 formed through the top cover 32. The current path between the low end 192 and the top contact 52 of the bimetal 180 is formed by a flexible copper classifier 200 which is connected by suitable means such as, for example, brazing, and the brazing is applied to the crobar 84. Is applied to the upper contact 52 and the lower end 192 of the bimetal 180. In this manner, the current path through the circuit breaker 30 is connected to the terminals 38B and (through the lower contact 50, the upper contact 52, the flexible classifier 200, the bimetal 180 and the conductive member 182). 40B).

In addition to the cradle latch surface 144 formed at the upper end of the elongated slot 146, the intermediate latch plate 148 is usually a quadrangular aperture 210 and a lower portion of the aperture 210. A pair of opposingly arranged and mutually extending pre-rotating arms 216 configured to be received in the forming groove 218 via the formed trip bar latch surface 212 and the inclined plane portion 214 and the side plate 86. ) Is included. The configuration of the aperture 218 is to limit the rotational operation of the swing voltage 216 and thus the intermediate latch plate 148.

Handle yoke latch 166 has aperture 220 through which one end 222 of pin 168 is received. Thus, the handle yoke latch 166 is movable or pivotable about the longitudinal axis of the pin 168. Opposite terminations 224 and ends 222 of the fins 168 are formed through the side plates 86 and are retained in the aperture 226 spaced apart by a pair of gaps. Prior to receiving the termination 224 in the aperture 226, the pin 168 passes through the torsion spring 170 and near the turned portion 228 disposed in the middle of the pin 168. Will be installed. One end of the torsion spring 170 body rests against the edge of the raised portion 232 of the pin 168 and keeps the spring 170 in a suitable operating position. The torsion spring 170 inclines the flat portion 214 of the intermediate latch plate 148 which moves counterclockwise to reset the intermediate latch plate 148 after the trip operation by the upper center toggle mechanism 80. And an upwardly extending spring arm 234 and a downwardly extending spring arm 236 for tilting the upper surface 237 of the trip bar 174 against the clockwise rotation of FIG.

Handle yoke latch 166 includes a downwardly extending latch leg 240 and a bent and extended handle yoke contact 242 (FIGS. 9 and 12), which is a reset operation (FIG. 14). In the slot portion 244 formed on the surface along the length of the pair of downwardly engaging arm 246 of the handle yoke 88. The combination of the downlocking support arm 246 described above with the handle yoke latch 166 prevents the handle yoke 88 from moving to its reset position assuming the contacts 72 and 306 have been welded to each other. do. If the contacts 72 and 306 are not welded to each other, the crossbar 84 rotates to its trim position (FIG. 15), and the handle yoke latch 166 supports the support arm 246 of the handle yoke 88. Rotation from the downward travel path causes the handle yoke 88 to enter the slot portion 244 to move past its open position to the reset position. The integrally molded outwardly protruding surface 248 of the cross bar 84 is the handle yoke ratt 166 while the cross bar 84 moves from its open position (FIG. 14) to its closed position (FIG. 3). Can engage and move the latch leg 240 from engagement with the handle yoke 88.

Preferably, the trip bar 172 is formed of an integral trip bar with three spaced apart down contacting legs 194, which contact legs 194 are associated with each pole or phase of the circuit breaker 30. It is connected.

Moreover, trip bar 172 has three extended amateur supports 250, which are for each pole or phase of rotary circuit breaker 30. Each support 250 is elongated and usually comprises a quadrilateral slot or pocket 252, which pocket 252 penetrates the support 250 to receive the down tripping leg 254 of the amateur 174. It is formed. (Figures 6 and 9). The amateur 174 has an outwardly extending edge or shoulder portion 256 that engages with the top surface of the pocket 252 to properly seat within the trip bar 172. Each trip leg 254 rotates the connected contact leg 194 of the trip bar 172 when a short circuit or a fixed current occurs.

Trip bar 172 also includes a latch surface 258 (FIG. 3) for engaging and latching with trip bar latch surface 212 of intermediate latch plate 148. Latch surface 258 is typically disposed between horizontally disposed surface 260 and the separate inclined surface 262 of trip bar 172. Latch surface 258 (FIG. 3) refers to a vertically extending surface having a length determined by the desired response characteristics of the actuation mechanism 58 for overload conditions. Moving about 1/2 mm upward of surface 260 is sufficient to release surfaces 258 and 212. This release immediately releases the cradle 96 from the intermediate latch pin 148 in the movement between the intermediate latch plate 148 and the cradle 96 along the surfaces 142 and 144. And counterclockwise rotation of the circuit breaker 30 to enable the trip operation. During the reset operation, the spring arm 236 of the spring 170 engages with the surface 237 of the trip bar 172 to rotate the surface 237 counterclockwise and trip with the intermediate latch plate 148. Latch surface 258 of trip bar 172 engages latch surface 212 of intermediate latch plate 148 to reset bar 172 and circuit breaker 30. The length of the inclined surface 157 of the cradle 96 is determined by the intermediate latch plate 148 until the latch surface 142 of the cradle 96 is positioned below the latch surface 144 of the intermediate latch plate 148. And a contact between the upper portion 214 of the intermediate latch plate 148 and the cradle 96 so as to prevent the reset operation of the trip bar 172 and the trip bar 172. Preferably, the circuit breaker 30 Each of the three poles or phases of the bimetal 180 and the armature 174 and the magnet 178 are installed so that the contact legs of the trip bar 172 when any phase connected to the circuit breaker 30 is overloaded. (194) apart.

In addition to the integral protruding surface 248, the crossbar 84 has three enlarged portions 270 (FIG. 12) separated by a round bearing surface 272.

Outwardly projecting locators 274 disposed around a pair are provided to hold the crossbars 84 at appropriate positions within the base 36. The locator 274 is received in an arched recess or groove 278 formed over the surface 276. Each enlarged portion 270 also includes a pair of apertures 280 (tenth) for receiving a toggle contact pin 110.

The pin 110 may be received in the aperture 280 in a suitable manner, for example by means of intermediate fixtures therebetween.

Each enlarged portion 270 includes a window, pocket or fully closed opening 282 formed to receive one end or base portion 284 of the top contact 52 of FIG. 3. Opening 282 receives and retains contact arm compression spring 286 (FIG. 12) and a spring follower 288 connected thereto. Compression springs 286 are held integrally in enlarged portion 270 by being disposed around boss 290 that is integrally formed and protrudes upwards.

The spring follower 288 is disposed between the compression spring 286 and the base portion 284 of the upper contact 52 to transfer the compressive force from the spring 286 to the base portion 284 and to the upper contact 52. ) And the crossbar 84 are integrated to make it move. The spring follower 288 includes a shoulder portion 294 to properly position and hold the spring follower 288 in the J-shaped groove 282 and the enlarged portion 270 at a pair of spacing apart. The first planar portion 296 is located at one end of the spring follower 288, and the second planar portion 298 is located at the other end of the spring follower 288 and is generally flat inclined portion 300. Away from the first planar portion 296.

The shape of the spring follower 288 is such that the top contact 52 moves in response to the movement of the crossbar 84 in response to the operator's handle 42 operation or actuation mechanism 58 during normal trip operation. Force to engage the base portion 284 of the upper contact 52. However, when overloaded, upper contact 52 can rotate around pin 110 by spring deflector 288 deflecting downward, and contacts 50 and 52 are quickly disconnected to actuate mechanism 58. This makes it possible to move to the open position of the third degree without waiting for the operation of the third. This independent operation is possible at any pole or phase of circuit breaker 30.

The sloped surface 302 of the base portion 284 of the upper contact 52 contacts the junction or sloped portion 300 between portions 289 and 300 of the spring follower 288 under normal operating conditions. Therefore, the crossbar 84 may maintain a coupling relationship with the upper contact 52. However, when a high voltage short circuit or fault current condition occurs, the inclined table 302 moves over and disengages portions 298 and 300. The terminal surface 304 of the base portion 284 also engages with the downwardly inclined flat portion 298 of the spring follower 288 to maintain the open position where the upper contact 52 is flipped and re-hit You can eliminate or minimize the possibility. Thus, when the circuit breaker 30 trips, the upper contact 52 is forced by the actuating mechanism 58 against the stop member 156 to move integrally with the crossbar 84. ) Is reset. During this reset operation, the surface 304 moves out of engagement with the portion 298 and the inclined portion 302 moves back in engagement with the spring follower 288. The shape of the spring follower 288 also allows for contact with the spring follower 288 of the surface 304 by changing the shape of the surfaces 302, 304 of the base portion 284 of the upper contact 52. The overall upward travel distance of the upper contact 52 may be changed as required during the retracted operation.

An opening 282 formed in the enlarged portion 270 of the crossbar 84 allows passage of the flexible classifier 200 through it, but does not significantly reduce the strength of the crossbar 34. As the flexible classifier 200 passes through the opening 282 near the rotation axis of the crossbar 84, the flexible classifier 200 can be bent to the minimum and the lifespan and reliability of the circuit breaker 30 can be increased.

The upper contact 52 also has a contact 306 and an upwardly moving extended contact arm 308 disposed between the contact 72 of the lower contact 50 and the contact 306 and the base portion 284. I can come in contact. High voltage residual circuits or overloads, typically through parallel contact arms and 308, generate highly repulsive magnetic forces placed therein, resulting in extremely fast separation of contacts 72 and 306. An insulating strip 309 is used to insulate the upper contact arm 308 from the lower contact arm 66.

In addition to the apertures 100, 218 and 226, the side plate 86 also has an aperture 310 for receiving and retaining the opposite side of the stop pin 90. A pair of bearing surfaces or round tabs 314 are also formed along the upper side of the side plate 86 of the baying or pre-rotation surface 312 formed at the lowermost periphery of the downwardly latching support arm 246 of the handle yoke 88. Combined with The handle yoke 86 can be adjusted to rotate about the blast furnace bearing surfaces 314 and 312. The side plate 86 also has a bearing surface 316 to contact the upper portion of the bearing surface 272 of the crossbar 84 and to securely hold the crossbar 84 in the base 34.

The side plate 86 typically has a C-shaped bearing surface 317 to hold the trip bar 172 in engagement with a plurality of retaining surfaces 320 (FIG. 5) formed as part of the molded base 34. As shown in FIG. And a pair of round bearing surfaces 318 disposed between the supports 250 of the trip bar 172. Each side plate 86 has a pair of downwardly latching support arms 322, which are extended to terminate the side plate 86 firmly in the circuit breaker 30 and terminate in a downwardly projecting stake or tab 324. The tab 324 is connected to the perforated metal plate 326 formed to be received in the recess 328 (FIGS. 5, 7 and 7). In the process of assembling the support plate 86 to the circuit breaker 30, the tab 324 passes through the aperture formed through the base 34 and is positioned in the recess 328 after passing through the metal plate 326. Done. The tab 324 then causes the tab 324 to engage the perforated metal plate 236 by mechanical deformation, such as, for example, hitting the head with a hammer, so that the side plate 86 is firmly connected to the base 34. Keep combined. A pair of tie plates 329 (FIGS. 5-8) are used to electrically insulate the surfaces of the conductive components and the poles of the circuit breaker 30 from the surfaces adjacent to the conductive components or poles.

In operation, circuit breaker 30 is interconnected with a three phase electrical circuit via lines and load lines connected to terminals 38A, B and C and 40A, B and C. The actuation mechanism 58 is set by the handle 42 from the trip position (FIG. 15), and the surface 142 latched by the engagement of the latch surfaces 212 and 258 past its open position (FIG. 14). The engagement of the 144 resets the intermediate latch plate 148, the cradle 96, and the trap bar 172. The handle 42 is then moved from the open position to the closed position and brings the actuation mechanism into contact with the contact 72 and 306. At this time, the circuit breaker 30 completes the preparation operation for protecting the three-phase electric circuit. If previously overloaded, the bimetal 180 remains heated and prevents the contact lag 194 of the trip bar 172 from deflecting to latch with the surface 212 and the surface 258, The handle 42 returns to the trip position (FIG. 15) so that the contacts 50 and 52 remain separated. After the bimetal 180 has returned to its normal operating temperature, the operating mechanism 58 is reset as described.

An overload condition occurs, and the lower end portion 192 of the bimetal 18 is bent clockwise to sufficiently deflect the contact leg 194 of the trip bar 172 and the intermediate latch plate 148 from the trip bar 172. This disengages, and relative movement occurs immediately between the cradle 96 and the intermediate latch plate 148 along the inclined surfaces 142 and 144. The cradle 96 is immediately accelerated by the spring 92 to rotate counterclockwise (FIG. 3), and the immediate movement of the upper toggle link 102, the toggle spring pin 106 and the lower toggle link 104. Cause. As described above, the propulsion surface or kicker 158 operates against the contact surface 160 of the pin 106 and causes the pin 106 to move quickly in an upward, counterclockwise arc direction to toggle the contact pin 110. The upward movement of and the upper contact 52 makes it possible to immediately move upward to the trip position (FIG. 15). Since the base portion 284 of the upper contact 52 is in contact with the inner surface 330 formed in each opening 282 of the cross bar 84 by being deflected by the spring 286, the upper contact 52 crosses. It moves integrally with the bar 84 and all three upper contacts 52 are simultaneously disconnected from the lower contact 50 in the circuit breaker 30. During this trip operation, the electrical arc appearing across contacts 72 and 306 is extinguished.

During the tripping operation, the movement of the upper contact 52 according to the movement of the crossbar 84 is limited by one or several partitions or stop members 331 (FIGS. 3 and 14) molded in the base 34. do. Each stop member 331 is coupled with the leading edge or surface 270A of the three enlarged portions 270 of the crossbar 84 to limit the rotational movement of the crossbar 84. Preferably, at least one stop member 331 is coupled to the surface 270A of each enlarged portion 270 molded in each pole or phase of the base 34 of the circuit breaker 30 and connected to each pole or phase. Thus, the circuit breaker 30 divides the mechanical stress applied to the crossbar 84 at the restricted position by the pole or phase. The stop member 331 in each pole or phase may be positioned away from an integral portion of the inner surface or wall of the tape 34 if desired.

Here, the stop member 156 and the not shown stop member in the center pole or phase of the circuit breaker 30 are integrally formed in the upper cover 32 in the pole or phase outside the circuit breaker 30 and the upper contact 52 It is hung to limit each excess movement. The rotational movement of the crossbar 84 is precisely determined and controlled by the crossbar 84 being rotatably mounted in the base 34 and the stop member 331 molded in the base 34. Since the working line of the spring 92 is changed during the trip operation, the handle 42 moves from the closed position (FIG. 3) to the trip position (FIG. 15). In addition, when the handle 42 is locked in the closed position, the actuation mechanism 58 will continue to respond to an overload or short circuit condition and will disengage the contacts 50 and 52 as described above. Moreover, if the contacts 72 and 306 are welded to each other, the pin 106 does not move to sufficiently change the line of action of the spring 92 (FIG. 3) and the spring 92 is moved to the pre-rotational surface of the side plate 86. It is held forward (left) of 312, and the handle 42 is inclined to the closed position so that the operator does not malfunction to contact the contacts 50 and 52.

When a short circuit or fault current condition occurs, the magnet 178 is immediately excited to attract the armature 174 to engage with the magnet 178, and the trip leg 254 of the armature 174 is tripped to the trip bar 172. Rotational movement in the clockwise direction (FIG. 3) against the contact leg 194 of the. This clockwise movement of the contact leg 194 immediately releases the latch plate 184 to cause a tripping operation.

In the occurrence of a high voltage short circuit or a fault current condition and the generation of a large magnetic repulsion force caused by the flow of fault current through parallel contact arms 66 and 308, the contacts 50 and 52 are quickly disconnected and are represented by the dashed line in FIG. Fold to the open position. When the compression spring 70 returns the contact arm 66 of the lower contact 50 to the open position, the contact arm 66 is retracted by the engagement of the surfaces 304 and 298 as described above. It is fixed in the open position. Separation of the contacts 50 and 52 is achieved without subsequent operation of the actuation mechanism 58 through the tripping operation. However, subsequent operation of the actuation mechanism 58 through a tripping operation may be achieved by the upper contact arm 308 exerting a force against the stop member 156 and the insulating barrier 332 in the center pole or phase of the circuit breaker 30. , By applying a force to the stop member integrally formed on the upper cover 32 in the outer pole or phase of the circuit breaker 30, a relative rotational operation occurs between the upper contact 52 and the crossbar 84, and the upper contact 52. The base portion 284 of the < RTI ID = 0.0 >) < / RTI >

Preferred embodiments of the present invention are described in detail below with reference to FIGS. 16-20.

In FIG. 16, each pole unit of the circuit breaker includes a pair of outlets 412 formed in the wall portion of the housing, and outlets to allow arc gas to be discharged from the circuit breaker housing and to prevent environmental pollutants from entering the housing. And a one-way valve 410 in connection with 412. In particular, the two outlets 412 extend side by side through the end wall of the housing cover 32, which are separated from each other by a post 414. The post 414 is formed as part of the lid 32 and has an equilateral trapezoidal cross section, as shown in FIGS. 16 and 18, wherein the non-parallel side 418 of the post 414 is Together with the surface 420 of the parallel lid, a corresponding outlet 412 is formed. Thus, the outlets 412 in each pole unit diverge against each other in the direction of gas flow from the housing.

Each one-way valve 410 is made from a single rigid flexible piece or elongated resilient member composed of sheet material such as bone fiber and meat paper, as shown in FIGS. 19 and 20. Is elastically bent around the post 414 and the opposite portion of the post inserted in the corresponding outlet 412 acts as a flapper one-way valve as in FIGS. 16-18. As is apparent from FIG. 18, the outlet 412 is open toward the housing base so that each valve 410 can be easily inserted into the associated outlet 412 and can be easily replaced with this same valve when needed.

In use, disconnection of the circuit breaker contacts under load will cause an arc between them. This arc generation rapidly increases the pressure in the circuit breaker housing, and also applies a force to open the one-way valve 410 as indicated by the virtual line of FIG. 18 so that the arc gas can escape through the outlet 412. Make. Thereafter, the pressure drop in the circuit breaker housing causes the flapper portion of the one-way valve 410 to return to its normal position, that is, the valve closing position, to block contaminants from entering the surroundings. In addition, even if the ambient pressure is increased, this will only add the blocking action of the one-way valve 410.

Claims (5)

A first contact, a second contact, an actuating mechanism in combination with the first contact and a second contact, a case in the form of a mold for housing the internal parts of the circuit breaker, and a gas produced from the inside of the case in the form of the mold In the electric circuit breaker composed of a blowout means consisting of a pair of pressure response extending side by side through the case to control the arc to eject to the outside, minimize the entry of surrounding impurities, the outlet 412 is Defined by the side wall 420 integrally formed in the case, separated from each other by the barrier 414, the one-way valve 410 is bent by the elasticity around the barrier and one direction in each of the slots 412 And an elongated resilient member having a portion on opposite sides of a barrier inserted in the slot to form a valve (410). The gas discharge device of claim 1, wherein the gas discharge device includes a discharge port 412 extending through the side wall of the housing, wherein the one-way valve 410 is disposed at the discharge port and has a wall surface of the housing to perform a one-way valve operation. An electric circuit breaker having an elastic valve portion coupled with elasticity. The gas discharge device of claim 1, wherein the gas discharge device includes a pair of discharge ports 410 extending side by side through the wall portion of the housing and separated from each other by a post 414, wherein the one-way valve 410 And an elongated elastic member bent with a tandem about the post and an opposite portion of the post inserted into each outlet to act as a flapper one-way valve. 4. The circuit breaker according to claim 3, wherein the outlets (412) are separated from each other in the gas flow direction through the outlets (412). 5. An electrical system as claimed in claim 3 or 4, wherein the housing comprises a lid removably mounted on the base and the outlet 412 is formed in the wall of the lid and is open towards the base. Circuit breaker.