KR0179280B1 - No-fuse breaker - Google Patents

Abstract

The present invention is to simplify the structure of the circuit breaker to improve the manufacturability and economics, and to improve the insulation performance and reliability.

To this end, the present invention is a case (1), a cover (2) coupled to the case (1) slidably along the upper surface of the case (1), and installed inside the case (1) and a fixed contact ( And a movable contact 6 fixed to one side of the cover 2 so as to linearly move together with the cover 2 and having contact with the fixed contact 3 of the fixed contact 4. The branch has a movable contact 7, an arc extinguishing chamber 5 provided below the fixed narrow chuck 4 of the case 1, and a movable contact 7 provided between the case 1 and the movable contact 7. The elasticity imparting means for imparting elasticity so that) always has a tendency to return to the tripping direction, and the tripping position of the movable contact 7 due to the restoring force of the elasticity imparting means as the cover 2 is positioned at the closing position. To stop the movement of the furnace and release the movable contactor (7) from the closed state when the over current flows into the trip position. It is a circuit breaker composed of a holding contact and the release means of the movable contact 7 provided on one side of the fixed contact (4) to return.

Description

Circuit breaker

1 is a perspective view showing a portion of a conventional circuit breaker cut away.

2 is a longitudinal sectional view showing an operating state of the present invention, (a) is a state diagram showing a case where the circuit breaker tripped.

(b) is a state diagram which shows the case where the circuit breaker was input.

3 is a front view showing a state in which the cover and the case of FIG.

(A) and (b) of FIG. 4 are longitudinal cross-sectional views showing A-A line and B-B line of FIG.

* Explanation of symbols for main parts of the drawings

1: case 2: cover

3: fixed contact 4: fixed contact

5: SOHO 6: Movable contact

7: movable contact 8: tension spring

9: heater 10: bimetal

11: Latch piece 12: Manual shutoff handle

13: hinge shaft 14: release lever

15: protrusion 16: guide officer

17: clamp

The present invention relates to a circuit breaker, and more particularly, to simplify the structure of a circuit breaker installed for protection of a power system to improve productivity and insulation performance.

In general, a circuit breaker refers to a device used to protect a power system by cutting off a current in case of an accident such as grounding or short circuit in a transmission and distribution system or an electrical circuit.

As shown in FIG. 1, the conventional circuit breaker has a handle 22 for manually inserting and tripping (blocking), a trip mechanism 20 for causing a tripping action, and a fixed contactor 4 for forming a converter. ) And a movable contact 7, an arcing chamber 5 for extinguishing arcs generated between the contacts of the movable contact 7 and the fixed contact 4, and a shaft linking trip and closing motions to each phase ( 21, a cross bar 23 for transmitting the overcurrent detection of the trip mechanism 20 to the opening and closing mechanism 19, a case 1 for protecting the internal device, and a cover 2 coupled to the case 1; ) And terminals 18a and 18b respectively connected to the power supply side and the load side.

As the conventional circuit breaker configured as described above pushes the handle 22 to the feeding position, the movable contact 7 and the fixed contact 4 are operated by the operation of the opening / closing mechanism 19 by the pushing force of the handle 22. ), A current path flowing into the power supply terminal 18a flows through the fixed contactor 4 and the movable contactor 7 toward the load terminal 23.

On the other hand, when the over-current during energization according to the input flows in the breaker, the trip mechanism 20 detects this, so that the trip mechanism 20 interlocks the cross bar 23 by sucking the amateur using the electromagnetic force.

Accordingly, the cross bar 23 is supported by the latching jaw of the cross bar 23 to release the link of the opening / closing mechanism 19 which presses the movable contact 7 through the shaft 21 to release the movable contact 7. To perform a tripping operation spaced apart from the fixed contact (4).

On the other hand, after the tripping operation is performed, the handle 22 is pushed to the reset position so that the latch portion of the link is caught by the latching jaw of the cross bar 23 so that the movable contact 7 can be reinserted.

However, such a conventional circuit breaker takes many parts, such as the opening and closing mechanism 19, the tripping mechanism 20, and the shaft 21, and because of its complicated structure, not only suffers a lot of difficulties during manufacture, repair and replacement. There was a high possibility of damage, malfunction, and deterioration of breaking performance.

In addition, due to the complexity of many parts and structures, a lot of time and costs are required in manufacturing, resulting in a decrease in productivity.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object thereof is to provide a circuit breaker that can simplify the structure of the circuit breaker to improve the manufacturability and economy, and to improve the insulation performance and reliability.

In order to achieve the above object, the present invention provides a case, a cover coupled to the case slidably along the upper surface of the case, a fixed contactor installed inside the case and having a fixed contact point, and a straight line with the cover A movable contact fixed to one side of the cover and having a movable contact in contact with the fixed contact of the fixed contactor; an arc extinguishing chamber installed under the fixed contact of the case; and a movable contact installed between the case and the movable contactor. Elastic imparting means for imparting elasticity to have a tendency to return to the direction, and blocking the movement of the movable contact to the trip position due to the restoring force of the elastic imparting means as the cover is positioned at the closing position while inflow of overcurrent The fixed contact to release the movable contact from the closed state and return to the trip position A circuit breaker consisting of a movable contactor In maintenance and release means is provided at one side.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 2 through 4.

FIG. 2 is a longitudinal sectional view showing an operating state of the present invention, and FIG. 3 is a front view showing a state in which a cover and a case of FIG. 2 are fastened, and (a) and (b) of FIG. 4 are lines AA and BB of FIG. Longitudinal sectional view showing a line.

According to the present invention, the cover 2 is slidably coupled to the case 1 along the upper surface, and a fixed contactor 4 having a fixed contact point 3 is installed at one side of the case 1, and the fixed contactor is installed. (4) an arc extinguishing chamber (5) is provided in the lower part, and a movable contact (6) contacting the fixed contact (3) of the fixed contactor (4) by linearly moving together with the cover (2) on one side of the cover (2) The movable contact 7 which has the branch is fixed.

In addition, an elastic imparting means is provided between the case 1 and the movable contactor 7 to give elasticity to the movable contactor 7 so as to have a tendency to return in the direction in which the movable contactor 7 always trips. On the one side of the fixed contactor 4, the cover 2 is located at the closing position, thereby preventing the return of the movable contactor 7 to the tripping position due to the restoring force of the elastic imparting means, while the movable contactor 7 when the overcurrent flows in. ) Is provided and is provided with a movable contact holding and releasing means for releasing from the closing state to return to the trip position.

At this time, the elastic imparting means is composed of a tension spring (8) is connected between the inner surface of the case (1) adjacent to the load side and the movable contact (7).

In addition, the movable contact input holding and releasing means is coupled to the heater 9 mounted on the outer circumferential surface of the fixed contactor 4 and the heater 9 and deformed by an angle proportional to the amount of heat generated by the heater 9 to rotate. Mounted on the tip of the bimetal 10 and the bimetal 10 to prevent the movable contact 7 from returning to the injection position according to the rotation of the bimetal 10 caused by the elastic restoring force when the cover 2 is moved. And a latch piece 11 for releasing the fixed state of the movable contact 7 when the bimetal 10 is deformed due to the flow of overcurrent.

On the other hand, the cover 2 is provided with a handle 12 for manual shutoff, one end of the handle 12 for the manual shutoff the hinge shaft 13 by pressing the other end of the handle 12 for manual shutoff The release lever 14 which rotates to the center and lifts the bimetal 10 and the latch piece 11 of the holding and disengaging means of the movable contact 7 and releases the break state of the breaker is mounted.

In addition, the case (1) and the cover (2) is a clamp (17) having a guide hole 16 formed in the projections (15) formed on both sides of the interface edge contacting each other is pressed into the cover (2) when the cover (2) is moved Is configured to linearly move within the guide hole 16 of the clamp 17.

Referring to the operation and effects of the present invention configured as described above are as follows.

First, in the disconnected state, the circuit breaker of the present invention is in a state in which the bimetal 10 is bent and elastically bent by the length of the latch piece 11 in contact with the upper surface of the movable contact 7 as shown in FIG. Will be maintained.

As described above, when the movable contact 7 is moved toward the fixed contactor 4 by pushing the handle 2a protruding from the cover 2 in the blocked state, the movable contactor 7 contacts the fixed contactor 4. Upon reaching a certain point, the latch piece 11 which is in contact with the upper surface of the movable contactor 7 slides out the upper end of the rear end of the movable contactor 7 and exits the rear end of the movable contactor 7 and is caught by the rear end of the movable contactor 7. .

That is, the latch piece 11 is rotated in the clockwise direction about the hinge point fixed to the heater 9 by the elastic restoring force of the bimetal 10, as shown in (b) of FIG. 7) The movable contactor, which is located on the rear end face, is tended to be retracted by the tension spring 8, which is an elastic imparting means installed between the inner wall of the load side case 1 of the wiring breaker and the movable contactor 7. (7) is caught by the latch piece 11 and cannot be returned to the position at the time of interruption. As described above, when the input is completed, the movable contact 7 and the fixed contactor 4 come into contact with each other, so that the current flowing into the front wall side terminal 18a passes through the fixed contactor 4 and the movable contactor 7 and the load side terminal ( A converter is formed that can flow toward 18b).

On the other hand, when overcurrent flows in the circuit breaker during the energization state, the heater 9 installed in the fixed contactor 4 generates heat. Accordingly, when the heat of the heater 9 is transferred to the bimetal 10, the bimetal 10 Is bent toward the smaller strain due to its properties.

Accordingly, the latch piece 11 mounted on the bimetal 10 and supporting the rear end of the movable contact 7 rises in proportion to the deformation amount of the bimetal 10, whereby the latch piece 11 is movable contact ( 7) When exiting the rear end, the movable contact 7 is quickly returned to the trip position by the restoring force of the tension spring 8 provided between the inner wall of the case 1 on the load side and the movable contact 7.

As described above, if the heat generation of the heater 9 is stopped and the bimetal 10 is cooled as the trip operation is performed, the latch piece 11 is again shown by the restoring force of the bimetal 10 as shown in FIG. The elastic contact is placed on the upper surface of the rear end of the movable contact 7.

On the other hand, when the user needs to manually release the wiring breaker, the other end of the manual shut-off handle 12 in which the release lever 14 of the manual shut-off handle 12 installed on the top of the cover 2 is not connected. When the manual shutoff handle 12 rotates around the hinge shaft 13 by pressing, the release lever 14 is raised to lift and move the bimetal 10 of the holding and disengaging means of the movable contactor 7. The interruption state of the breaker is canceled by eliminating the interference between the latch piece 11 and the movable contact 7 which blocked the movement of the contact 7.

As described above, the present invention can simplify the structure of the circuit breaker to improve the manufacturability and the economics, while also improving the insulation performance and reliability.

In other words, since a simple structure which does not require many parts such as a complicated opening mechanism 19, a trip mechanism 20, and a shaft 21 like a conventional circuit breaker is operated accurately and quickly, the breaking performance against an accident current may be improved. In addition, it brings convenience and practicality in many aspects, including manufacturing, repairing, maintenance and replacement.

On the other hand, the present invention, the case (1) and the cover (2) is coupled to each other at the same time the clamp (17) formed with the guide hole 16 is formed in the projections (15) formed on both sides of the interface edge contacting the cover (2) The cover 2 has a simple fastening structure in which the cover 2 moves reciprocally linearly in the guide hole 16 of the clamp 17 when moving.

In addition, the present invention is accompanied with the same function and effect even if a compression spring is installed between the inner surface of the case (1) adjacent to the power supply side and the movable contactor (7) as the elastic imparting means, and the holding of the movable contactor (7) and Instead of the bimetal 10 of the releasing means, an armature rotating by the suction force of the electromagnetic force element and the electromagnetic force element is installed, and the movement of the movable contactor 7 may be blocked and released according to the rotation of the armature by the suction of the electromagnetic force element. Of course.

And, the handle of the present invention is integrally formed on the cover (2), but by fixing the cover (2) and forming a guide hole in the cover 2 by installing the handle to linearly move along the guide hole in the guide hole It is also possible to operate only the handle without the movement of (2) so that closing and tripping of the circuit breaker is performed.

As described above, the present invention is a very useful invention to simplify the structure of the circuit breaker to improve the manufacturability and economics, and to improve the insulation performance and reliability.

Claims (9)

A case, a cover coupled to the case so as to be slid along an upper surface of the case, a fixed contactor installed inside the case and having a fixed contact point, and fixed to one side of the cover to linearly move with the cover. A movable contact having a movable contact in contact with the fixed contact, an arc-extinguishing chamber provided below the fixed contact of the case, and installed between the case and the movable contact to impart elasticity so that the movable contact always has a tendency to return to the trip direction. Stop the movement of the movable contact to the trip position due to the restoring force of the elastic imparting means as the cover is positioned in the closing position, and releases the movable contactor from the closing state when the overcurrent flows in. Movable contact input holding provided on one side of the fixed contact to return to And a disconnecting means. 2. The circuit breaker according to claim 1, wherein the elastic imparting means is provided with a tension spring between the inner surface of the case adjacent to the load side and the movable contact. The circuit breaker according to claim 1, wherein the overcurrent sensing means is provided with a heater on an outer circumferential surface of the fixed contactor. The method of claim 1, wherein the movable contact input holding and releasing means is coupled to a heater mounted on the outer peripheral surface of the fixed contactor, a heater mounted on the outer peripheral surface of the fixed contactor is deformed in proportion to the amount of heat generated by the heater rotates, and The latch piece mounted on the bimetal tip prevents the movable contactor from returning to the closing position due to the rotation of the bimetal due to the elastic restoring force when the cover is moved. Circuit breaker, characterized in that consisting of. According to claim 1, wherein the protrusions are formed on both sides of the boundary surface edge of the case and the cover, the clamp is formed with a guide hole is formed in the protrusion is a cover reciprocating linear movement in the guide hole of the clamp when the cover is moved The circuit breaker characterized by the above-mentioned. According to claim 1, The guide hole is formed in the cover, the handle is coupled to the movable contact in the guide hole is installed so as to move along the guide hole by the operation of the handle only in the state that the cover is fixed and Circuit breaker, characterized in that trip is made. According to claim 1, wherein the upper cover is provided with a handle for manual blocking, one end of the manual blocking handle is rotated around the hinge axis in accordance with the other end of the manual blocking handle to maintain the movable contact input and release means And a release lever for lifting the bimetal to release the circuit breaker by removing the interference between the latch piece and the movable contact. The circuit breaker according to claim 1 or 2, wherein the elastic applying means is provided with a compression spring between the inner surface of the case adjacent to the power supply and the movable contactor. 5. The circuit breaker according to claim 1 or 4, wherein an armature rotating by the suction force of the electromagnetic force element and the electromagnetic force element is provided instead of the bimetal of the movable contact input holding and releasing means.