KR200477245Y1 - Circuit breaker with qucik making mechanism - Google Patents

Abstract

The present invention relates to a miniature circuit breaker having an in-phase input. In the present invention, the length of the contact surface for pressing the handle link is shorter than the length of the non-contact surface so as to accelerate the movement of the movable contact to the open position or the closed position in the introductory device coaxially connected to the handle shaft portion, Thereby accelerating the rotating speed of the movable contact connected through the handle link and the shaft, thereby accelerating the closing speed of the circuit breaker, thereby minimizing damage to the contacts and peripheral devices due to the arc.

Description

{CIRCUIT BREAKER WITH QUCIK MAKING MECHANISM}

The present invention relates to a circuit breaker, and more particularly, to a miniature circuit breaker having an in-phase input capable of accelerating the input (closed) and blocking (open) operating speeds in a miniature circuit breaker.

The small circuit breaker is a circuit breaker called a wiring breaker. The circuit breaker automatically cuts the circuit (hereinafter referred to as "trip") by detecting the current of the abnormal current by manually supplying or interrupting the single- It is a circuit breaker with the function to protect the circuit.

The miniature circuit breaker is usually distinguished from an industrial wiring breaker having a three-phase AC power switching function and an abnormal current breaking function for exclusive use of a factory or a building, and includes an opening / closing mechanism, a trip mechanism, Is configured to manually switch on and off.

However, in the conventional miniature circuit breaker, it is difficult to expect improvement of the closing speed and the closing speed because the operator proceeds manually closing and shutting off, and it is difficult to expect an improvement of the tripping speed even in the automatic tripping operation. Therefore, in the conventional miniature circuit breaker, due to the influence of the arc generated when the movable contact or the contact of the fixed contact, or the peripheral device thereof during the trip operation due to the circuit breaker trip, There is a problem that the circuit opening / closing and tripping performance of the miniature circuit breaker is deteriorated.

It is therefore an object of the present invention to provide a circuit breaker having a quick-access device capable of minimizing damage caused by an arc by accelerating the contact and separation speed between the movable contact and the stationary contact in the input, .

In order to achieve the object of the present invention, a handle for providing a manual operating means; A handle shaft portion rotatably supporting the handle; A handle link connected to the handle to transmit rotational power of the handle; A fixed contact electrically connected to a power source or a load side of the power circuit; A movable contact capable of being pivoted to a closed position in contact with the fixed contact to bring the power circuit into a close circuit state or into an open position separated from the fixed contact to bring the power circuit into an open circuit state; A shaft which is connected to the handle link and is rotatable about a support shaft, supports the movable contact and is rotatable together with the movable contact; And a lever that is coaxially coupled to the handle shaft portion and includes a first guide portion having a contact surface to press the handle link and a second guide portion extending from the contact surface and having a non- LEVER), wherein the lever has a quick access opening in which the length of the contact surface is shorter than the length of the non-contact surface.

Here, it is preferable that the length of the contact surface is less than 50% of the length of the non-contact surface.

The circuit breaker according to the present invention has a structure in which the length of the contact surface for pressing the handle link is made shorter than the length of the noncontact surface in order to accelerate the movement of the movable contactor from the interlocking device coaxially connected to the handle shaft portion to the open or closed position Accelerates the movement speed of the movable contact connected through the handle link and the shaft by accelerating the movement of the handle link at the time of input, thereby accelerating the closing speed of the circuit breaker, thereby minimizing the damage of the contacts and peripheral devices caused by the arc.

Fig. 1 is a longitudinal sectional view showing an example of a circuit breaker having a quick access opening according to the present invention,
Fig. 2 is a vertical cross-sectional view of the recess of the circuit breaker shown in Fig. 1,
Figs. 3 and 4 are a perspective view and a front view of a trans lever in the intro- duction device according to Fig. 2,
Figs. 5 to 7 are operation state diagrams showing an off (trip) position, a middle position, and an on (closing) position in the circuit breaker according to Fig. 1, respectively.

Hereinafter, a circuit breaker having a quick access device according to the present invention will be described in detail with reference to an embodiment shown in the accompanying drawings.

FIG. 1 is a longitudinal sectional view showing an example of a circuit breaker having a quick access opening according to the present invention, and FIG. 2 is a longitudinal sectional view showing the recess of the circuit breaker according to FIG.

1 and 2, a small circuit breaker according to the present invention (hereinafter abbreviated as a circuit breaker) includes a switching mechanism located at the uppermost position and providing an opening and closing driving force of a circuit, A trip mechanism for detecting an abnormal current such as a short-circuit current or an overcurrent on the circuit and triggering the opening / closing mechanism to operate as a trip position, and a movable contactor 5 and a stationary contactor 10 And an arc extinguishing mechanism for arc extinguishing an arc generated when the movable contactor 5 and the stationary contactor 10 are opened and closed.

Here, the fixed contactor 10 is provided so as to be electrically connected to the power source or the load side of the power circuit, and the movable contactor 5 contacts the stationary contactor 10 to close the power circuit to a closed circuit state ) Position or an open or trip position that separates from the fixed contact 10 and places the power circuit in an open circuit state. The stationary contactor 10 has a terminal portion 11 for electrical connection to an external power circuit or load side of an external power circuit.

The opening and closing mechanism includes a handle 1, a handle link 2, a shaft 3, a support shaft 4, a latch 6, and a trip bar 7 .

The handle 1 provides the user with manual operating means for circuit opening and closing. The handle 1 has a grip portion 1a formed to protrude upward so as to be grasped by a user and a handle shaft portion 1b provided at a lower portion of the grip portion 1a to provide a rotation axis of the handle 1. [ A power transmitting projection portion 1c, and a handle link connecting portion 1d. The power transmitting protruding portion 1c extends outward on the outer peripheral surface of the handle shaft portion 1b on the opposite side of the grip portion 1a and the handle link connecting portion 1d extends from the power transmitting protruding portion 1c by a predetermined angle, (1b).

The handle link 2 may be formed of a pin having a U shape and connected to the shaft 3 at one end 2a which is an upper end connected to the handle 1 as shown in Fig. And the other end portion 2b as a lower end portion. The steering wheel link 2 transmits elastic force from the steering wheel 1 to the shaft 3 or a spring spring (not shown) during the trip operation to the shaft 3, (The clockwise direction in Fig. 1) to the handle 1. In this case,

The shaft 3 is formed in an approximately "L" shape. One end of the L-shaped shaft 3 is connected to the other end 2b of the handle link 2 and the support shaft 4 provided at the central bent portion of the L- As shown in Fig. The other end of the "L" -shaped shaft 3 is provided so as to be rotatable in the same direction together with the movable contactor 5, supporting the movable contactor 5. [ Therefore, the shaft 3 receives the power of the user from the handle 1 transmitted by the handle link 2 and rotates the movable contact 5 supporting it as it rotates to the closed position or the open position, The movable contact 5 is automatically rotated to the open position by receiving elastic energy discharged from the trip spring during operation.

The support shaft (4) provides a rotation axis of the shaft (3) that supports the shaft (3) rotatably. The support shaft 4 is preferably made of a metal pin and both ends of the support shaft 4 are supported by a support groove or a support not shown in the side wall of the enclosure of the circuit breaker .

The latch 6 restrains the shaft 3 and the position permitting the elastic energy of the trip spring by allowing the rotation of the shaft 3 so that the trip spring has a position where the trip spring restrains the elastic energy. The latch 6 is rotatable around a rotational axis located at the upper portion. The latch 6 is held by the trip bar 7 at its lower end or is released from restraint by the rotation of the trip bar 7, And is rotatable about a rotation axis.

The trip bar (7) is rotatably supported by a rotating shaft. And has a step portion on one side (right side) for restraining the left lower end portion of the latch 6. The left lower portion of the trip bar 7 extends downward from the center portion supported by the rotation shaft so as to face the plunger 9 of the trip mechanism. Therefore, the trip bar 7 is rotated (clockwise in FIG. 1) about the rotation axis by pressing the left end of the plunger 9 when the trip mechanism 8 is magnetized .

The trip mechanism includes a trip coil 8 and a plunger 9.

A trip coil 8 is typically made up of a coil that is electrically connected to the power circuit through the fixed contact 10 and generates a magnetic force proportional to the amount of current passing through the power circuit.

The plunger (9) is driven to move horizontally by the magnetic force inside the trip coil (8). For example, when a short-circuit current corresponding to several tens of times the rated current is energized in the power circuit, the trip coil 8 generates a strong magnetic force proportional thereto, and accordingly the plunger 9 is moved from the position of FIG. 1 to the left And the left end of the plunger 9 advances to the left to press the lower left portion of the trip bar 7 to rotate the trip bar 7. [

The softer mechanism EM comprises a plurality of soho grids made of a ferromagnetic material and stacked as a roughly "U" shape, as well known, and a pair of soho grids stacked on both sides at regular intervals And a support plate.

The miniature circuit breaker according to the present invention further includes a lead-in lever (12) that forms a quick-fit. 3 and 4 are a perspective view and a front view of a trans lever in the intrusion device according to FIG.

The handle 12 is formed on the upper half of the handle shaft 121 so as to be coaxially coupled with the handle shaft portion 1b and the guide hole 122 is formed on the lower half of the handle shaft 2 to be engaged with the handle link 2.

The guide portion 122 includes a first guide portion 122a and a second guide portion 122b formed continuously along the longitudinal direction. The first guide portion 122a and the second guide portion 122b are formed to have two imaginary center lines a and b parallel to each other at a predetermined interval in the width direction. A contact surface 123 is formed in the first guide hole 122a so as to press the handle link 2 while a contact surface 124 is formed in the second guide hole 122b so as to be spaced apart from the handle link 2. [ .

An engagement surface 125 is formed between the contact surface 123 and the non-contact surface 124 in a stepped manner. The first guide portion 122a and the second guide portion 122b are not formed in a straight line with each other and the center line a of the contact surface 123 is not aligned with the center line b of the non- And are spaced apart from each other by a predetermined distance in the width direction.

When the circuit breaker is in the closing position, the other end portion 2b of the handle link moving to the trip position or the blocking position comes into contact with the other end portion 2b of the handle link 2 at the lower end of the second guide bore 122b, The inclined surface 126 is formed so as to guide the movement of the inclined member 126 and the inclined surface 127 inclined at a predetermined angle is formed on the surface where the inclined member 126 extends, .

In this case, depending on the difference in length between the first and second guide portions 122a and 122b, or the difference between the length L1 of the contact surface 123 and the length L2 of the non-contact surface 124, The speed can vary. For example, when the length L1 of the contact surface 123 is longer than the length L2 of the non-contact surface 124, the contact surface 123 pressurizes the handle link 2 for a long time, When the length L1 of the contact surface 123 is shorter than the length L2 of the noncontact surface 124, the time during which the contact surface 123 presses the handle link 2 is shortened, and the charging speed can be increased. The length L1 of the contact surface 123 is shorter than the length of the second guide bore 122b so that the length of the contact surface 123 is shorter than the length of the contact surface 124 L2), it is possible to increase the charging speed and to reduce the number of arcs generated during the blocking and opening / closing operations. In particular, when the length of the contact surface 123 is formed to be approximately 50% or less of the length of the non-contact surface 124, the charging speed is proportionally increased with the difference between the contact surface 123 and the non-contact surface 124, Can be significantly reduced.

In the drawing, reference numeral 127 is a turning force receiving projection.

Hereinafter, the operation of the circuit breaker according to the present invention will be described.

That is, when the user grasps the handle 1 in the state of Fig. 5 and rotates about 1/2 of the direction from the off (trip) position toward the on (input) direction, The handle link connection portion 1d also rotates by the angle corresponding to the angle rotation. Then, the one end 2a of the handle link 2 also rotates clockwise by the corresponding angle of the handle link connecting portion 1d. The other end portion 2b of the handle link 2 having the U shape is rotated by the corresponding angle in a direction opposite to the one end portion to be lowered while being in contact with the contact surface of the first guide portion, As shown in FIG. As the other end portion 2b of the handle link 2 moves downward, the L-shaped shaft 3 rotates in the counterclockwise direction and accordingly the movable contactor 5 connected to the lower end portion of the shaft 3 And is rotated toward the stationary contactor 10 by the corresponding angle.

7, the lower end portion 2b of the handle link 2 is engaged with the first guide portion (not shown) of the first lever 12, as shown in FIG. 7, when the user further rotates the handle 1 in the ON- 122a of the second guide portion 122b and descends further to move to the second guide portion 122b. Then, the movable contactor 5 rotates further in the direction of the stationary contactor 10 together with the shaft 3, so that the circuit breaker is turned on.

When the other end portion 2b of the handle link 2 moves away from the engagement surface 125 and moves to the second guide portion 122b, the other end portion 2b of the handle link 2 is completely engaged with the contact surface 125 It moves freely and moves faster.

Accordingly, when the length L1 of the contact surface 123 of the first guide portion 122a is shortened as in the present embodiment, the handle link 2 not only quickly approaches the engagement surface 125, So as to quickly move to the lower end of the second guide bore 122b, thereby shortening the injection time as a whole. That is, since the time to reach the engagement surface 125 from the start of the closing operation is shortened, the time required for the entire handle link 2 to be inserted is shortened.

In this manner, by including the quick accessory having a contact surface for pressing the handle link and connected coaxially with the handle shaft portion, the movement of the handle link is accelerated to accelerate the rotation speed of the movable contactor supported by the shaft and shaft connected to the handle link Thereby accelerating the opening and closing of the circuit breaker and thus accelerating the tripping speed, thereby preventing damage to the contacts and peripherals caused by the arc, thereby minimizing the performance degradation of the miniature circuit breaker.

In addition, since the length of the contact surface contacting the handle link is minimized compared to the length of the non-contact surface, it is possible to reduce the contact time with respect to the handle link upon input, thereby reducing the travel time of the handle link, It can accelerate. In addition, it is possible to more effectively prevent the damage of the contacts and the peripheral devices due to the arc, thereby minimizing the performance degradation of the miniature circuit breaker.

1: Handle 2: Handle link
3: shaft 4: support shaft
5: movable contactor 6: latch
7: Trip bar 8: Trip mechanism
9: plunger 10: fixed contact
11: terminal portion 12:
121: handle shaft shaft 122a: first guide bend
122b: second guide bore 123: contact surface
124: non-contact surface 125:

Claims (3)

A handle for providing a manual operating means;
A handle shaft portion rotatably supporting the handle;
A handle link connected to the handle to transmit rotational power of the handle;
A fixed contact electrically connected to a power source or a load side of the power circuit;
A movable contact capable of being pivoted to a closed position in contact with the fixed contact to bring the power circuit into a close circuit state or into an open position separated from the fixed contact to bring the power circuit into an open circuit state;
A shaft which is connected to the handle link and is rotatable about a support shaft, supports the movable contact and is rotatable together with the movable contact; And
And a lever (LEVER) having a guide hole formed to be coaxially coupled with the handle shaft portion,
Wherein the guide portion comprises a first guide portion and a second guide portion formed continuously along the longitudinal direction of the lever,
A contact surface is formed in the first guide hole in the longitudinal direction so as to press the handle link, and a non-contact surface is formed in the second guide hole to be separated from the handle link,
The width of the two guide bores is formed to be larger than the width of the first guide bores such that the non-contact surface is spaced apart from the handle link,
Wherein the length of the contact surface is shorter than the length of the non-contact surface. The method according to claim 1,
Wherein the length of the contact surface is less than 50% of the length of the non-contact surface.
The method according to claim 1,
Wherein the contact surface and the non-contact surface are formed in the longitudinal direction of the lever, respectively, and the engagement surface is formed between the contact surface and the non-contact surface in the width direction of the lever,
Wherein the engaging surface is inclined obliquely with respect to the width direction of the lever, and the inclined surface guiding the movement of the handle link from the second guide portion to the first guide portion is formed.

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