KR102085222B1 - Instantaneous Trip Apparatus and Circuit Breaker Having the Same - Google Patents

Abstract

The present invention provides an instantaneous trip apparatus. The instantaneous trip apparatus comprises: a fixed magnet generating magnetic attraction when an overcurrent flows; an armature installed to face the fixed magnet and moved to the fixed magnet to hit a trip bar by the magnetic attraction force; and an elastic fixture having one end connected to the armature and the other end connected to the fixed magnet, and elastic fixture returning the armature to an original position when an overcurrent does not flow.

Description

Instant Tripous Apparatus and Circuit Breaker Having the Same}

The present invention relates to a forward seating device and a circuit breaker including the same. More specifically, since the armature is not moved past the original position during the forward seating operation, the arming force of the armature is kept constant during the additional magnetization, thus providing accurate and rapid instantaneous The present invention relates to a forward tripping device capable of tripping and a circuit breaker including the same.

Representative accidents that occur in electric wiring circuits using electricity can be divided into leakage, electric shock, overload and short circuit. In particular, the circuit breaker is a safety device to prevent accidents and secondary ripple accidents occurring in the electric wiring circuit by automatically detecting the fault current (overload, short circuit) in the electric wiring circuit and automatically cutting off the circuit.

In general, the circuit breaker is mostly operated mechanically based on electric and magnetic operation using a mechanism, and any voltage can be used below the operating voltage, and in particular, the operation of the circuit breaker is determined by the magnitude of the current rather than the magnitude of the voltage. .

When the rated current flows in the electric wiring circuit, the circuit breaker is in the on position, while when overcurrent flows in the circuit, the trip device operates to trip the circuit breaker to the off position to cut off the circuit.

Trip is the operation that the breaker detects the abnormal current in the circuit breaker and cuts off the power automatically. The tripping operation is usually performed by using the thermal and thermal functions using the bending characteristics of the bimetal according to the method of tripping the circuit breaker. The thermoelectric method using the fixed and movable iron cores, the fully electronic using the viscosity of the silicone oil, and the semiconductor devices are used. Electronic and the like are known.

Among them, a thermal electromagnetic circuit breaker is connected to a fixed contactor, a movable contactor, and a switchgear, which form a path through contact or separation with each other by the on / off state of the switchgear and the switchgear, thereby tripping the switchgear. It may include a trip bar, a bimetal that is coupled to the movable contactor when the overcurrent flows in the circuit and moves the trip bar, and a fixed magnet that generates an electromagnetic force by the current flowing through the bimetal.

When the overcurrent flows in the circuit, the circuit breaker including the forward seating device increases the magnetic flux density of the fixed magnet to serve as a magnet and attracts the surrounding metal. The lever that is bound to the trip bar is released by the force pushing the trip bar by the bending of the bimetal and the force pushing the trip bar by the forward seating device, and the movable contactor is separated from the fixed contact and the opening and closing mechanism is moved to the off position. The blocking speed is much faster and more reliable than thermal breakers.

In other words, when the switch is in the off position, the fixed contactor and the movable contact are not in contact with each other, and electricity cannot be used through the load side. It flows to the load side. The bimetal curved in correspondence with the flowing current cannot push the trip bar in a state where the degree of curvature is less than the rated current of the circuit breaker, so that the on / off mechanism of the on state cannot be tripped. This is because when the switch mechanism is in the on position, the lever is locked to the trip bar to push the trip bar toward the load side to release the restraint.

When an overcurrent that is higher than the rated current flows, the bimetal bends a lot, whereby the trip bar is pushed to release the restraint of the lever to move the opening and closing mechanism to the off position, and the fixed contactor and the movable contactor are separated and the electrical connection is disconnected.

The overcurrent can generally refer to all of a few times more than one times the rated current to several tens or hundreds of times, but usually overcurrent of 1.25 to 5 times overcurrent, 8 to 20 times overcurrent, And an overcurrent of 20 times or more is referred to as a short circuit current, a short circuit, or a short circuit current.

In particular, when the overcurrent is not very large, for example, when the instantaneous current flows, the bimetal bends slowly, and it takes time to push the trip bar to trip, which often leads to an accident due to a long trip time.

In particular, in order to satisfy various instantaneous currents in a small circuit breaker, it is difficult to have a structure for tripping in response to spatial constraints and a small amount of current, and there is a limit in thermoelectric electromagnetic force.

As described above, in the case of a small short circuit and a circuit breaker, the bimetal-based method has been used for protection against overcurrent, but in addition, an instantaneous mechanism of a fixed magnet and an armature combination is additionally employed to improve the instantaneous and overcurrent performance of the circuit breaker. to be. Such a combination of stationary magnets and armatures is typically configured to act secondary to bimetallic operation.

The instantaneous structure is fixed to the non-magnetic metal with elasticity so that the armature itself can break the breaker by hitting the trip bar in the state where the overcurrent multiple is high (for example, 10 times or several tens of the rated current). And it is difficult for the armature itself to switch the breaker by hitting the trip bar in a state in which the rated current or the overcurrent multiple is low (for example, within 2 to 5 times the rated current).

As the trip bar moves, the trip bar may trip with only one shock, and the trip bar may trip only after several shocks.

When the trip bar trips by one impact, the force pulled by the armature by the magnetic force is equivalent to the case where the force to hold the opening / closing mechanism is kept on. In this case, the trip occurs by a single shock, but in the case of the small circuit breaker, the magnetized part is small and the magnitude of the current flowing along the converter is also small, making it difficult to trip the breaker by a single shock.

Therefore, depending on the characteristics of the alternating current, the magnet is magnetized when the current flows in one direction, and the magnet is attracted to the armature. When the current is not flowing, the magnet is returned to its original position, and when the current flows in the opposite direction, the magnet is fixed. The trip bar is continuously moved through several repetitive motions, and finally the trip bar and the lever are separated so that the breaker shuts off.

In particular, the role of repetitive motion is important in the operation of the instantaneous structure. For this purpose, the instantaneous structure uses the function to keep the armature at a constant distance from the fixed magnet when no current flows, and the elastic force is reduced to the armature under a certain current. It is important to have a function that prevents attraction. In addition, it is important to provide the function of returning the armature to the original position and the function of keeping the position of the armature constant in a repetitive operation in which a current flows to 0 and flows again.

Figure 1 schematically shows the operating state of the forward-slip device according to the prior art.

Referring to Figure 1 (a), a magnetic field is formed around the current flows, it is magnetized by the magnetic field and becomes a magnet while electricity flows. At this time, when the object that becomes the magnet is divided into two parts, the fixed part and the non-fixed part, the unfixed object moves toward the fixed object. If electricity flows along the arrow indicating the current flow, the fixed magnet 10 and the armature 20 are pulled from each other by the magnetic field.

The fixed magnet 10 and the armature 20 are assembled so that one end is fixed to each breaker with a screw, but may be assembled while maintaining a constant position at all times, but may not be consistently assembled depending on the distribution of parts and the state of the assembling worker. Most of them are assembled with slight deviations.

1 (b) and 1 (c), the most efficient force obtained by the magnetic field is a case where a and b positions coincide, but the length of the leaf spring 30 is short and the leaf spring 30 Since the support point G, which is fixed by the screw and can flow, is far from the armature 20, it is impossible to match the a and b positions, resulting in some loss of magnetic force.

That is, it is difficult to move the vertical axis of the armature 20 due to the restraint by the support point (G) of the leaf spring 30, and the magnetization area of the fixed magnet 10 and the armature 20 does not match the a part and b part There is a problem of shrinking.

Figure 2 schematically shows the tripping operation of the forward seating device in the breaker according to the prior art.

FIG. 2 (a) schematically shows the initial state, FIG. 2 (b) shows the trip bar strike state, and FIG. 2 (c) schematically shows the armature return state due to the loss of magnetization and elastic force.

2 (a) and 2 (b), when the breaker in the normal current state is changed to the breaker in the state of high overcurrent multiple, the fixed magnet 10 is magnetized to the maximum and pulls the armature 20. The armature 20 dragged toward the fixed magnet 10 stops hitting the trip bar T. At this time, the trip bar T is slightly moved backward due to the collision of the armature 20.

Referring to FIG. 2 (c), when the magnetic force due to the current is not present, the armature 20 is returned to its original position by the leaf spring 30 having elasticity. At this time, the armature 20 is moved past the original position due to the repulsive force of the leaf spring (30). However, if the armature 20 is moved too far in this way, the distance (D) of the fixed magnet 10 and the armature 20 is wider than the original interval, thereby causing the armature's operating force during additional magnetization As a result of the weakening, a problem arises in that a quick and accurate tripping operation is not performed.

Korea Patent Registration No. 10-1838991

The present invention has been made to solve the above problems, an object of the present invention is to provide a forward seating device that does not lose a portion of the magnetic force by the vertical axis of the arm when the trip bar hit by the bent portion of the elastic stator. It is.

It is another object of the present invention to provide a forward seating apparatus capable of accurate and rapid forward seating operation by providing a constant moving force during additional magnetization by limiting the distance of armature movement so that the armature does not move past the original position during the forward seating operation. will be.

It is still another object of the present invention to provide a circuit breaker capable of accurate and rapid forward-slip operation without losing part of the magnetic force.

In order to achieve the above object, the forward seating device according to the present invention has a fixed magnet that generates magnetic attraction when an overcurrent flows, and is positioned to face the fixed magnet, and is moved toward the fixed magnet by the magnetic attraction. An armature hitting the trip bar, and one end is connected to the armature, the other end is connected to the fixed magnet, and if the overcurrent does not flow, it may include an elastic stator to return the armature to the win position.

The armature may include a plate portion and a hitting portion protruding from the plate portion toward the trip bar, and striking the trip bar.

The elastic stator has a first plate portion having one end connected to the fixing magnet, a bent portion extending from the other end of the first plate portion, and a second portion extending from the bent portion and having one end connected to the armature. It may include a flat plate.

The bent portion is connected to a first bent portion that is bent in a direction opposite to the formation direction of the hitting portion of the armature, and a second bent portion that is bent in a direction opposite to the bend direction of the first bent portion. It may include.

When the armature hits the trip bar, the curved form of the first bent portion is maintained the same as the curved form when the armature is in the original position, and the curved form of the second curved portion is that the armature is in the original position. It can be changed more slowly than the shape of the curve.

The first bent portion, the upper plate, the lower plate formed to be spaced apart from the upper plate, and one end of the upper plate and one end of the lower plate, and includes a curved plate of the curved form, wherein the upper plate and the lower plate It can form horizontal.

The elastic holder may be made of a nonmagnetic metal having an elastic force.

The forward seating device may further include a movement section limiting member formed at a position spaced apart from the amateur by a predetermined distance to limit the movement section of the amateur to a predetermined range when the armature is returned to its original position.

The movement section defining member may extend downward from the cover member.

The moving section limiting member may be made of a material that can mitigate an impact upon contact with the armature.

The material may be one selected from the group consisting of polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), and urethane.

According to the present invention, since the support point of the armature is moved from the fixing magnet side to the armature side by the bent portion of the elastic stator, the armature can be moved vertically during the tripping of the trip bar, so that a part of the magnetic force is not lost.

Further, according to the present invention, by limiting the moving distance of the arm after the trip bar hit by the moving section limiting member so that the armature is not moved past the original position during the forward slit operation, the operating force of the armature during the additional magnetization is kept constant, The advantage is that accurate and fast forward slip operation is possible.

Figure 1 schematically shows the operating state of the forward-slip device according to the prior art.
Figure 2 schematically shows the tripping operation of the forward seating device in the breaker according to the prior art.
3 schematically illustrates a circuit breaker in which a forward seating device according to an embodiment of the present invention is installed.
4 is a schematic view of a forward-slip device according to an embodiment of the present invention.
FIG. 5 schematically illustrates an exploded view of a forward-slip device according to an embodiment of the present invention.
Figure 6 schematically shows the operation of the forward-slip device according to an embodiment of the present invention.
FIG. 7 schematically illustrates a perspective view of a circuit breaker in which a forward seating device according to another embodiment of the present invention is installed.
FIG. 8 schematically illustrates a side view of a circuit breaker having a forward seating device according to another embodiment of the present invention.

It is to be noted that the technical terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In addition, the technical terms used in the present specification should be interpreted as meanings generally understood by those skilled in the art to which the present invention belongs, unless specifically defined otherwise in the present specification, and are overly inclusive. It shall not be construed in the sense of or in the sense of being excessively reduced. In addition, when the technical terms used herein are incorrect technical terms that do not accurately express the spirit of the present invention, they should be replaced with technical terms that can be properly understood by those skilled in the art.

In addition, the general terms used in the present invention should be interpreted as defined in the dictionary or according to the context before and after, and should not be interpreted in an excessively reduced sense.

Also, the singular forms used herein include the plural forms unless the context clearly indicates otherwise. In the present application, terms such as “consisting of” or “comprising” should not be construed as necessarily including all of the various components or steps described in the specification, and some of the components or some steps It should be construed that it may not be included or may further include additional components or steps.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the scope of the present invention is not limited to the following Examples.

3 schematically illustrates a circuit breaker having a forward seating device according to an embodiment of the present invention. 4 is a schematic view of a forward-slip device according to an embodiment of the present invention.

3 and 4, the breaker B has a cover member (not shown) removed. The forward seating device 1000 according to an embodiment of the present invention installed in the breaker B includes a fixed magnet 100, an armature 200, an elastic stator 300, a bimetal 500, and a movable contactor ( 600).

The fixed magnet 100 generates magnetic attraction when overcurrent flows.

In detail, the fixed magnet 100 is magnetized only when an overcurrent flows around, and thus has the property of a magnet. That is, when overcurrent flows around the fixed magnet 100, the fixed magnet 100 is magnetized to generate an electromagnetic force, and the electromagnetic force attracts the armature 200.

The armature 200 is positioned to face the fixed magnet 100 and is moved toward the fixed magnet 100 by the magnetic attraction to strike the trip bar T. The trip is made by repeatedly hitting the trip bar (T) of the armature 200, the electricity is cut off.

One end of the elastic holder 300 is connected to the armature 200, the other end is connected to the fixing magnet (100). The elastic stator 300 returns the armature 200 to the win position when no overcurrent flows.

The bimetal 500 has a property of bending in one direction by heat or current, and when an overcurrent flows, the bimetal 500 is bent by the bending property of the bimetal 500 itself to make the trip bar move. Implement

One upper surface of the movable contact 600 is coupled to the elastic stator 300 is coupled to the armature 200, the upper surface of the elastic stator 300 is coupled to the bimetal 500, the bimetal ( 500) The fixed magnet 100 is coupled to one upper surface.

FIG. 5 schematically illustrates an exploded view of a forward-slip device according to an embodiment of the present invention.

4 and 5, at one end of the fixed magnet 100, a through hole 110 for coupling with other components of the forward seating device 1000 is formed.

One end of the bimetal 500 is formed with a through hole 510 for coupling with other components of the forward seating device 1000.

The armature 200 may include a plate portion 210 and the striking portion 220.

The plate portion 210 may be provided at the rear side with a protrusion 212 for connection with the elastic holder 300 to be described later.

The striking part 220 extends from one side end of the plate part 210 to protrude toward the trip bar (FIG. 3, T), and when the overcurrent flows, the armature 200 is fixed to the fixed mart net 100. The striking part 200 hits the trip bar T by moving to the side.

The elastic holder 300 may include a first flat plate 310, a curved portion 320, and a second flat plate portion 330.

The elastic guide 300 effectively enables the repetition of the trip operation of the forward seating device 1000. That is, when no overcurrent flows, the armature 200 maintains a constant distance from the fixed magnet 100, and below a certain current, the magnetic force is reduced by using the self-elasticity of the bent portion 320 of the elastic fixing unit 300. Do not attract).

One end of the first flat portion 310 may be connected to the fixed magnet 100.

The first flat part 310 may be provided with a hole 312 for coupling with other components of the forward seating device 1000.

The bent portion 320 extends from the other end of the first flat plate portion 310.

The curved portion 320 may include a first curved portion 322 and a second curved portion 324.

The first bent part 322 is bent in a direction opposite to the formation direction of the hitting part 220 of the armature 200.

The second bent part 324 is connected to the first bent part 322 and is bent in a direction opposite to the bent direction of the first bent part 322.

The curved form of the second curved portion 324 is gentle compared to the curved form of the first curved portion 322.

The second flat portion 330 extends from the curved portion 320 and is connected to the armature 200. The second flat portion 330 is provided with a connection hole 332 for connection with the protrusion 212 of the armature 200.

The elastic holder 300 may be made of a nonmagnetic metal having an elastic force.

For example, the elastic holder 300 may be made of a material such as phosphor bronze.

At one end of the movable contact 600, a ball 610 for coupling with other components of the forward seating device 1000 is formed.

Figure 6 schematically shows the operation of the net-slip device according to an embodiment of the present invention.

6 (a) to 6 (c), assuming that electricity flows along an arrow indicating current flow, the fixed magnet 100 and the armature 200 are pulled by each other by magnetic fields. .

At this time, since the length of the first flat portion 310 of the elastic holder 300 is longer than the length of the flat portion of the leaf spring (FIGS. 1 and 30) according to the prior art, the support point of the elastic holder 300 in the present invention ( G ') is moved toward the armature 200 side than the support point G of the leaf spring 30 according to the prior art.

In addition, the first curved portion 322 includes an upper plate 322a, a lower plate 322b, and a curved plate 322c, and the upper plate 322a and the lower plate 322b are curved to be horizontal, The upper plate 322a and the lower plate 322b are spaced apart by a predetermined distance d.

That is, according to the present invention, the support point (G ') of the elastic fixing stand 300 is moved to the armature 200 side is located on the extension line of the armature 100, the upper plate of the first bent portion (322) A vertical axis elasticity corresponding to a predetermined distance d between the 322a and the lower plate 322b is possible, such that the armature 200 is attracted to the fixed magnet 100 to contact the fixed magnet 100 and the armature 200. , The a and b positions can be matched. As a result, no loss of magnetic force occurs.

In addition, when the armature 200 hits the trip bar, the bend shape of the first bent part 322 is maintained the same as the bend shape when the armature 200 is in the original position, and the second bent part ( The bending form of 324 may be changed more gently than the bending form when the armature 200 is in the original position.

FIG. 7 schematically illustrates a perspective view of a circuit breaker having a forward seating device according to another embodiment of the present invention. 8 is a schematic side view of a circuit breaker in which a forward seating device according to another embodiment of the present invention is installed.

 7 and 8, the forward seating device according to another embodiment of the present invention may include a fixing magnet 100, an armature 200, an elastic holder 300, and a moving section limiting member 400.

Since the configuration of the fixed magnet 100, the armature 200, and the elastic holder 300 is the same as the configuration described with reference to Figures 1 to 6 will be omitted.

The moving section defining member 400 extends downward from the upper end of the cover member C. When the cover C is fastened to the main body M, the moving section defining member 400 is the armature. It may be located at a distance away from the 200. In more detail, the movement section limiting member 400 is a predetermined distance from the armature 200 in a direction opposite to the formation direction of the striking portion (FIGS. 5 and 220) of the armature 200 (the original position direction of the amateur). Can be provided in a spaced apart place.

In the moving section defining member 400, after the armature 200 hits the trip bar T, the armature 200 returns to its original position due to the elastic restoring force of the elastic holder 300 while the overcurrent does not flow. When moved, it serves to limit the moving section of the armature 200 so that the armature 200 is not moved farther than the original position.

That is, when the armature 200 tries to move farther than the original position, the movement section limiting member 400 serves as a physical partition wall so that the armature 200 cannot move further than the original position.

Therefore, even if the armature 200 hits the trip bar T repeatedly, the armature 200 does not move farther than the original position due to the moving section limiting member 400, The interval D 'is kept constant. As a result, the operation force of the armature 200 can be kept constant during the additional magnetization of the fixed magnet 100, it is possible to enable accurate and rapid forward-slip operation.

In addition, the moving section limiting member 400 is not fixedly installed in the breaker main body M, but is formed extending downward from the upper end of the cover member C (in the direction of the breaker main body M). There is an advantage in enabling accurate and rapid forward-slip operation without changing the design position of each component in the breaker body (M).

On the other hand, the moving section limiting member 400 may be made of a material that can mitigate the impact when in contact with the armature 200.

The material may be one selected from the group consisting of nylon (PA6, PA66), polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), and urethane.

On the other hand, the breaker (B) according to an embodiment of the present invention may include a main body (M) and the cover (C).

The main body M is provided with the forward seating apparatus described with reference to FIGS. 1 to 8, and the cover C may be provided with a moving section limiting member 400 described with reference to FIGS. 7 and 8.

Breaker B according to an embodiment of the present invention, by limiting the moving distance of the armature 200 after the trip bar hit by the moving section limiting member 400, the operation force of the armature 200 during the additional magnetization is constant In this case, there is an advantage that accurate and rapid forward-slip operation is possible.

While specific embodiments of the present invention have been described above, the present invention is not limited to the above-described specific embodiments, and the technical field to which the present invention pertains without departing from the gist of the present invention as claimed in the claims. Anyone of ordinary skill in the art can make various modifications, as well as such modifications are within the scope of the claims.

100 fixed magnet
200 amateur
300 elastic guide
310 first plate portion 320 bend portion 330 second plate portion
400 moving section limited member
500 bimetal
B breaker
C cover
T trip bar

Claims (10)

A fixed magnet that generates magnetic attraction when overcurrent flows;
An armature positioned to face the fixed magnet, the armature being moved toward the fixed magnet by the magnetic attraction force and hitting a trip bar;
An elastic holder having one end connected to the armature and the other end connected to the fixed magnet, and returning the armature to the win position when no overcurrent flows; And
When the armature is returned to the original position by the elastic stator, the arm's moving section is limited to a predetermined range so that the arm's operating force is kept constant during further magnetization so that the armature is moved from the armature in the original position direction of the armature. And a moving section defining member which is formed at a predetermined distance apart from the cover member and extends downward from the cover member. According to claim 1,
The amateur said,
Plate section; And
Protruding from the plate portion toward the trip bar side, and hitting the trip bar hitting the trip sheet apparatus comprising a. The method of claim 2,
The elastic holder,
A first flat plate having one end connected to the fixed magnet;
A bent portion extending from the other end of the first flat plate portion; And
And a second flat plate extending from the bent portion and having one end connected to the armature.
The bent portion,
A first curved portion bent in a direction opposite to a direction in which the striking portion of the armature is formed; And
And a second bent part connected to the first bent part and bent in a direction opposite to the bend direction of the first bent part. The method of claim 3, wherein
When the armature hits the trip bar, the curved form of the first bent portion is maintained the same as the curved form when the armature is in the original position, and the curved form of the second curved portion is that the armature is in the original position. The forward seating device, characterized in that it is changed more gently than when bending. The method of claim 3, wherein
The first bent portion,
Top plate;
A lower plate spaced apart from the upper plate;
And connecting one end of the upper plate and one end of the lower plate, and a curved plate having a curved shape.
The top sheet and the bottom plate, characterized in that the forward sheet forming apparatus characterized in that the horizontal. According to claim 1,
The elastic stator is a pure sheet device, characterized in that made of a non-magnetic metal having an elastic force. delete delete According to claim 1,
The moving section limiting member is made of a material that can mitigate the impact when in contact with the armature,
The material is a pure sheet device, characterized in that one selected from the group consisting of nylon (PA6, PA66), polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP) and urethane. A circuit breaker comprising a forward seating device according to any one of claims 1 to 6 and 9.

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