KR101948723B1 - DC circuit breaker with manual trip mechanism - Google Patents

Abstract

A DC circuit breaker according to the present invention includes an enclosure forming an appearance; a stator having a fixed contact and installed at one side of the enclosure; a mover provided inside the housing facing the stator and having a movable contact electrically contacted with the fixed contact selectively; a closing device installed on one side of the enclosure adjacent to the mover, for temporarily fixing the mover so that the movable contact comes into contact with the fixed contact by an input force inputted from the outside; an overcurrent trip device installed inside the enclosure opposite to the charging device and automatically tripping the mover from the stator when an abnormal current is generated; and a manual trip mechanism for separating the trip device from the mover by applying an external force from the outside of the enclosure when a trip is required except for the occurrence of the abnormal current. According to the present invention, it is possible to manually trip the breaker in a situation where it is determined that a worker needs to do so, or when a trip is required due to a change of installation position of a breaker, test, etc., and workability and efficiency are improved.

Description

Technical Field [0001] The present invention relates to a DC circuit breaker having a manual trip mechanism,

The present invention relates to a DC circuit breaker having a manual trip mechanism capable of manually tripping a circuit breaker.

In general, a DC circuit breaker is a device used to quickly and efficiently cut off the system for equipment and system protection in the event of repair, replacement, or fault current of a high voltage direct current (HVDC) transmission line or power distribution line to be.

DC transmission has less power loss and stability than AC transmission, but has difficulty in boosting and stepping down and blocking. Recently, the development of DC breaker has been increasing to utilize the superiority of DC transmission. Accordingly, the rated voltage of circuit breakers such as DC1000V, DC1200V, and DC1500V is also increasing and diversifying. As a result, many companies around the world are developing a product line that meets DC operating voltage.

Like the AC circuit breaker, the DC circuit breaker is tripped or tripped when an overcurrent or instantaneous current is generated. The breaker protects the circuit breaker and the line by cutting off the power provided to the load side by the breaking operation.

An example of such a trip device of a DC breaker is disclosed in Korean Patent Registration No. 10-1823516.

The trip device of the DC breaker described above is connected to the circuit and is operated according to the instantaneous fault current flowing in the circuit to protect the DC circuit breaker and the line. However, such a DC breaker has a structure in which the trip device is automatically operated according to the fault current, so that there is a problem that tripping can not be performed when a manual trip is necessary.

Korean Patent Registration No. 10-1823516 (Registration date January 24, 2018)

It is an object of the present invention to provide a DC circuit breaker having a manual trip mechanism capable of manually tripping a circuit breaker if necessary.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description and more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

The DC circuit breaker of the present invention comprises an enclosure forming an outer appearance; A stator having a fixed contact and installed at one side of the enclosure; A mover provided inside the housing facing the stator and having a movable contact electrically contacted with the fixed contact selectively; A closing device installed on one side of the enclosure adjacent to the mover, for temporarily fixing the mover so that the movable contact comes into contact with the fixed contact by an input force inputted from the outside; An overcurrent trip device installed inside the enclosure opposite to the charging device and automatically tripping the mover from the stator when an abnormal current is generated; And a manual trip mechanism for separating the trip device from the mover by applying an external force from the outside of the enclosure when a trip is required except for the occurrence of the abnormal current.

The charging device includes a push rod partially exposed to the housing and receiving the charging force, and a latch unit that maintains the mating state of the mover by the charging force received by the push rod.

The mover includes a first movable bracket having the movable contact, a second movable bracket coupled to the first movable bracket and rotatably coupled to one side of the enclosure, and a latch engaging pin engaged with the latch, And a second movable bracket having one end connected to the second movable bracket and the other end coupled to one side of the enclosure, wherein the movable contact and the fixed contact are in contact with each other, And a return spring installed in an extended state.

The latch portion includes a latching jaw which is engaged with the outer circumferential surface of the latching engagement pin.

And the latching jaw is formed to extend larger than the radius of the latching engagement pin by a latching amount (H).

And the return spring is coupled to the second movable bracket at one end thereof coupled to the housing at a height greater than the height of the other end coupled to the housing.

Wherein the manual trip mechanism includes a trip member that is partially exposed to the outside of the enclosure and receives an external force, one end is inserted into a lower surface of the enclosure and the other end is extended upward, A vertical rod which is vertically moved up and down, a cam member rotatably coupled to the vertical rod so as to pivot by the vertical rod, one end fixed to the cam member and the other end pivotably connected to the rotation of the cam member And a rotary member which is rotatably installed adjacent to the latch portion and rotates in the direction of the latch portion by the trip shaft when the trip shaft rotates.

The manual trip mechanism may further include a trip frame coupled to a lower surface of the enclosure to support the trip shaft in a rotatable manner, and a trip plate coupled to or integrally formed with the trip shaft to press the rotational member .

Wherein the trip member includes a horizontal rod having one end exposed to the outside of the enclosure and receiving the external force and a slip plate formed at the other end of the horizontal rod and having a slope in a direction toward the vertical rod, A cam rotation pin formed adjacent to the lower surface of the enclosure and protruding toward the cam member, and a trip pin protruding toward the slip plate at the other end extending upward.

When the external force is applied to the horizontal rod, the slip plate moves toward the vertical rod, and the slope moves upward to move the vertical pin.

The cam member is formed with a slot that is formed at a portion spaced apart from a portion where the trip shaft is engaged, and a slot is formed to be inserted into the cam rotation pin, and the cam rod rotates while the vertical rod rises.

The rotary member includes a rotary movable part formed in a T shape and extending in the form of a cantilever and pressed by the trip plate to rotate in the direction of the latch part, And a latch pressing portion protruding from the latch engagement pin in a direction to disengage from the latch engagement pin.

The latch portion is disengaged from the latch engaging pin when the latch portion is pressed by the projection of the latch pressing portion, and the return spring is restored when the latch portion is disengaged, so that the mover is separated from the stator.

According to the present invention, it is possible to manually trip the breaker in a situation where it is determined that a worker needs to do so, or when a trip is required due to a change of installation position of a breaker, test, etc., and workability and efficiency are improved.

In addition, since the present invention realizes a manual trip with a simple structure, the number of components can be reduced and the assembling performance of the circuit breaker can be improved.

FIG. 1 is a view showing a state of closing a DC breaker according to an embodiment of the present invention.
2 is a view of a DC breaker according to the line AA in Fig.
3 is a view showing a trip shaft of a DC breaker according to an embodiment of the present invention.
4 is a view showing the cam portion of the DC breaker according to the line BB in Fig.
5 is an enlarged view of the cam portion of the DC breaker according to Fig.
6 is an enlarged view of a latch portion of the DC breaker according to FIG.
FIG. 7 is a view illustrating a cam portion when a manual trip of a DC breaker according to an embodiment of the present invention. FIG.
8 is a view illustrating a time point at which a DC circuit breaker is manually tripped according to an embodiment of the present invention.
9 is an enlarged view of the cam portion of the DC breaker according to Fig.
10 is an enlarged view of a latch portion of the DC breaker according to FIG.
11 is a view illustrating a state in which the DC circuit breaker is manually tripped according to an embodiment of the present invention.
12 is a view showing a trip shaft of a DC breaker according to another embodiment of the present invention.

The above and other objects, features, and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, which are not intended to limit the scope of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to denote the same or similar elements.

3 is a view showing a trip shaft of a DC breaker according to an embodiment of the present invention. Fig. 4 is a view showing the cam portion of the DC breaker according to line B-B in Fig. 2; 5 is an enlarged view of the cam portion of the DC breaker according to Fig. 6 is an enlarged view of a latch portion of the DC breaker according to FIG.

Generally, the DC circuit breaker is formed of an insulating material and has an enclosure (not shown) for accommodating the components therein. A trip device, an opening / closing device, an SOHO device, or the like may be installed inside the enclosure.

The opening / closing device is a mechanism for driving the fixed contact, the movable contact and the movable contact to a circuit closing position contacting the fixed contact and a circuit opening position separated from the fixed contact. The opening and closing device may include a trip spring, a trip bar, a nail, a latch holder, a latch, an opening and closing handle, a lever, a link, a shaft, ), And the like.

A trip device is a device that detects when an accident current such as an overcurrent or a short-circuit current flows on a circuit and triggers the opening / closing device to operate at a circuit open position.

The SOHO mechanism is constituted by stacking a plurality of grids around the movable contact and the fixed contact, and the arc is generated between the movable contact and the fixed contact during operation (for example, trip operation or manual off operation) arc).

In a normal operating state, the charging device is brought into contact with the fixed contact, and when the fault current is generated, the charging device is separated from the fixed contact by the trip device. The contact and separation of the stationary contact and the charging device are carried out by driving the mover.

In general, tripping occurs automatically when a fault current occurs. However, the trip mechanism to be described below is for separating the input device and the fixed contact manually, for example, when a trip is required at the judgment of the operator, or when the pull-in and pull-out positions are changed according to the test of the breaker.

1, a DC breaker 10 according to an embodiment of the present invention includes a base frame 11 for accommodating and supporting components in an enclosure, a plurality of vertical frames 15, 16, and 17, And each component is supported or coupled to these components. The DC breaker 10 includes a stator 100 electrically connected to the upper terminal 12, a mover 300 contacting or disconnecting the stator 100 by rotational motion, And a charging device 500. An overcurrent trip device 13 for automatic trip is provided inside the enclosure opposed to the charging device 500. The injector 500 can be released from the mover 300 by means of the manual trip mechanism 700 (the stator, the mover, the charging device, the overcurrent trip device, etc. are well known in the art, Only the configuration related to the manual trip mechanism of the invention will be described in detail).

The movable member 300 includes a first movable bracket 310 provided with a movable contact 312 which contacts or separates from the stationary contact 110 of the stator 100 and a second movable bracket 310 connected to the first movable bracket 310, A second movable bracket 330 for supporting the movable bracket 310 and a mover rotating shaft 350 for rotatably supporting the second movable bracket 330. The mover 300 is fixed by the charging device 500 and remains in contact with the stationary contact 110. The mover 300 can be separated from the movable contact 312 by being rotated by the return spring 370 when the fixing force of the injector 500 is removed.

The first movable bracket 310 and the second movable bracket 330 are disposed to be coupled to each other along the height direction (vertical direction in FIG. 1) of the DC breaker 10. That is, the first movable bracket 310 and the second movable bracket 330 are disposed to be substantially perpendicular to the base frame 11.

At one side of the first movable bracket 310 facing the stator 100, a movable contact 312 which is in contact with the fixed contact 110 and is electrically connected is formed.

The second movable bracket 330 is rotatably coupled to the support bracket 14 provided in the enclosure. The second movable bracket 330 is rotatably supported by the supporting bracket 14 by the mover rotating shaft 350. A return spring 370 is coupled to the upper side of the second movable bracket 330.

One end of the return spring 370 is coupled to the upper side of the second movable bracket 330 and the other end is coupled to the support bracket 14 fixed to the specific frame or enclosure bottom 11 in the enclosure. The return spring 370 is in a state of being tensioned at the connection position of the stator 100 of the mover 300. One end of the return spring 370 coupled to the second movable bracket 330 is coupled to a position higher than the other end. Accordingly, when the force for fixing the mover 300 is removed, the return spring 370 is restored and the upper portion of the second movable bracket 330 of the mover 300 is pulled to rotate the mover 300 ). The mover 300 is maintained or disconnected from the position where the mover 300 is electrically connected to the stator 100 by the charging device 500. [

1 and 5, the charging device 500 is an apparatus for electrically connecting the mover 300 to the stator 100. The mover 300 is a device for applying a linear force to the mover 300, 300). The state where the mover 300 is temporarily fixed by the charging device 500 and electrically connected to the stator 100 is referred to as a closing state. At this time, the force input by the input device 500 can be defined as an input force.

The input device 500 is installed in the enclosure and includes a push rod 510 to which a linear force is input, a rod block 530 to support an end of the push rod 510, And a latch portion 570 connected to the support block 550 and fixing the second movable bracket 330. [

When an external force applied from the outside presses the push rod 510, the push rod 510 presses the rod block 530 and the support block 550 while performing a linear movement. The linear force of the push rod 510 is transmitted to the latch portion 570 and the latch portion 570 is retained by the latch engagement pin 332 of the second movable bracket 330 so that the mover 300 is fixed temporarily do.

One end of the latch portion 570 is coupled to the support block 550 so as to allow a slight flow, and the other end is engaged with the latch engagement pin 332. For this, the latch portion 570 has a bar shape having a predetermined length, and a latching protrusion 572 is formed at the other end of the latch portion 570.

The latching jaw 572 is formed at the other end of the latch portion 570 and is formed in a direction toward the latching engagement pin 332. [ 1, the latching jaw 572 is disposed below the other end of the latch portion 570. [ The latching jaw 572 has a shape corresponding to the shape of a part of the outer circumferential surface of the latching engagement pin 332 since it has to be retained by the latching engagement pin 332. Further, it is preferable that the latching jaw 572 has a sufficient size so as not to be detached from the latching engagement pin 332. [ The latching jaw 572 has a shape that descends further downward than the radius of the latching pin 332 in a state in which the latching jaw 572 is caught by the latching engagement pin 332. [ The engaging protrusion 572 becomes the engaging amount H which can be caught by the latch engaging pin 332 by a portion extending more than the radius of the latch engaging pin 332. [

The latching amount H means the length of a portion extending beyond the radius of the latching pin 332 in the vertical direction with reference to Fig.

The latch portion 570 is disengaged from the latch engaging pin 332 by a manual trip mechanism 700 to be described later so that one end of the latch portion 570 is coupled to the support block 550 . This will be described later.

And a manual tripping mechanism 700 for releasing the closing force in a closing state in which the charging device 500 fixes the mover 300 which is rotated by applying a linear force.

1 to 6, the manual trip mechanism 700 includes a trip frame 710 for supporting a component, a trip shaft 720 supported by the trip frame 710, a trip shaft 720 supported by the trip frame 710, A tripping plate 730 coupled to the tripping member 740, and a tripping member 740 for manual tripping. The manual trip mechanism 700 further includes a vertical rod 750 driven by the trip member 740, a cam member 760 connected to the vertical rod 750 and the trip shaft 720, (Not shown).

As shown in Fig. 2, the trip frame 710 is disposed on the left side of the enclosure when viewed in the A direction from the position of the line A-A in Fig. The trip frame 710 has one end fixed to the enclosure bottom 11 and the other end extending upward. The trip frame 710 may have a shape in which a bar or a plate is bent a plurality of times according to interference with surrounding components. A trip shaft 720 is coupled to the lower side of the trip frame 710.

The trip shaft 720 is connected to the cam member 760 to be described later and is rotationally driven, and serves to rotate the rotating member 770. As shown in FIGS. 2 and 3, the trip shaft 720 is a cylindrical rotary shaft, one end of which is inserted through the trip frame 710, and the other end of which is coupled with the trip plate 730. The trip shaft 720 has a cam member 760 fixed to an end portion through which the trip frame 710 is inserted and is rotatably supported on the trip frame 710. That is, a hole is formed in the trip frame 710, and the hole passes through the trip shaft 720 and extends to the left with reference to FIG. The cam member 760 is coupled to one end of the extended trip shaft 720, and the trip plate 730 is fixed to the other end. One end of the trip shaft 720 must be able to be fixed to the cam member 760 since it must pivot in conjunction with the rotation of the cam member 760. [ Therefore, one end of the trip shaft 720 preferably has a rectangular cross-sectional shape.

The trip plate 730 is coupled to the other end of the trip shaft 720 and has a bar shape larger than the diameter of the trip shaft 720. The trip plate 730 has a length greater than the diameter of the trip shaft 720 and has a predetermined thickness. The trip plate 730 is coupled to one side of the outer circumferential surface of the trip shaft 720, and the plate surface is disposed along the radial direction of the trip shaft 720. The trip plate 730 can be coupled to the trip shaft 720 by a pin or the like. The trip plate 730 is fixed by a pin or the like so as not to flow or rotate when engaged with the trip shaft 720.

The trip plate 730 is brought into contact with the outer circumferential surface of the trip shaft 720 at one surface and the other surface is in contact with the rotationally movable portion 772 of the rotating member 770 (see FIG. 6). The trip plate 730 is integrally driven with the trip shaft 720 and functions to push and rotate the rotating member 770 by the rotation of the trip shaft 720.

The trip plate 730 has a length larger than the diameter of the trip shaft 720. Therefore, the trip plate 730 protrudes downward from the trip shaft 720 in the closed state with reference to FIG. The trip plate 730 is rotated by the cam member 760 when the rotary member 770 is pressed and the lower surface of the trip plate 730 contacts the rotary member 770 to press the rotary member 770. The trip plate 730 is rotationally driven by the rotation of the trip shaft 720 and the trip shaft 720 is rotationally driven by the trip member 740.

The trip member 740 includes a horizontal rod 742 to which an external force is inputted from the outside and a slip plate 744 provided at an end of the horizontal rod 742.

As shown in Figs. 4 and 5, the horizontal rod 742 is a portion receiving a force input from the outside by a user or a mechanism, and one end thereof is exposed through the vertical frame 15 to the outside of the frame. The horizontal rod 742 is circular or polygonal in cross-section and has a predetermined length. A slip plate 744 is formed at the other end of the horizontal rod 742.

The slip plate 744 is a portion pushed in the direction of the arrow by the horizontal rod 742 when the horizontal rod 742 is pressed in the direction of the arrow. One end of the slip plate 744 is formed in the same shape as the horizontal rod 742, and the other end is expanded in the shape of a polyhedron. The other end of the slip plate 744 has an inclined surface 744a extending toward the vertical rod 750 and a pinching protrusion 744b protrudes from the end of the inclined surface 744a.

The inclined surface 744a is inclined from the upper side to the lower side with reference to Fig. 4, and the inclined surface 744a is formed at an acute angle with the horizontal rod 742. [ The end of the inclined surface 744a is protruded toward the vertical rod 750 to form a pinching step 744b.

The pinching jaw 744b extends from the end of the inclined surface 744a and contacts the lower side of the trip pin 752 formed on the vertical rod 750 with the upper side in the state before the manual tripping.

On the other hand, the vertical rod 750 is disposed in parallel with the vertical frame 15, and the lower end is inserted into the enclosure 11 and the upper end thereof is extended upward. One end of the vertical rod 750 is inserted into and supported by the outer bottom surface 11 so as not to be fixed in the outer bottom surface 11 but not to be detached. The vertical rod 750 has a trip pin 752 protruding toward the slip plate 744 adjacent to the upper end and a cam rotation pin 754 coupled to the cam member 760 adjacent to the lower end.

The trip pin 752 and the cam rotation pin 754 are protruded in a cylindrical shape and can protrude in the same direction. The trip pin 752 is in contact with the pinching jaw 744b of the slip plate 744 in the state before the manual tripping and the pinching jaw 744b supports the trip pin 752 from the lower side. The cam rotation pin 754 is pivotally coupled to the cam member 760.

The slip plate 744 moves in the direction of the arrow when the horizontal rod 742 is pressed in the direction of the arrow in the manual trip state. At this time, the slip plate 744 moves in the direction of the arrow and the slope 744a is pushed to the lower side of the trip pin 752. [ The effect that the trip pin 752 moves to the left along the inclined surface occurs while the inclined surface 744a moves in the arrow direction.

The trip pin 752 is lifted in accordance with the movement of the slip plate 744 and the vertical pin 750 is lifted by the rise of the trip pin 752. As the slip plate 744 is moved upward, .

As the vertical rod 750 rises, the cam rotation pin 754 also rises together, and the cam member 760 rotates by the rise of the cam rotation pin 754.

4 to 6, the cam member 760 is coupled to the cam rotation pin 754 of the vertical rod 750. As shown in Fig.

The cam member 760 can have a partial spherical shape on one side, and the above-mentioned trip shaft 720 is fixed to a portion having a partially spherical shape. The trip shaft 720 must rotate in conjunction with the rotation of the cam member 760 so that the trip shaft 720 should not arbitrarily flow with one end fixed to the cam member 760. [ Therefore, it is preferable that the end portion of the trip shaft 720 has a rectangular cross-section. Since the end of the trip shaft 720 is inserted and fixed to one side of the cam member 760, when the cam member 760 rotates, the trip shaft 720 can rotate together. At this time, the rotation center axis of the cam member 760 and the rotation center axis of the trip shaft 720 are formed to be the same (the rotation center axis is located on a virtual line parallel to the vertical rod 750 but spaced apart by a predetermined interval) Reference).

The other side of the cam member 760 may extend in a U-shape from a side having a partial sphere shape. A slot 762 is formed along the longitudinal direction on the other side extending in a U-shape and a cam rotation pin 754 is inserted into the slot 762. One side of the cam member 760 is fixed to the trip shaft 720 and the other side is raised by the cam rotating pin 754 when the vertical rod 750 rises. Therefore, when the vertical rod 750 rises, the cam member 760 rotates.

The tripping plate 720 is rotated by the rotation of the cam member 760 so that the tripping plate 730 provided on the tripping shaft 720 drives the rotating member 770 to rotate.

The rotating member 770 has a function of raising the latch portion 570 while rotating, and has a substantially 'T' shape. A rotary shaft for rotatably supporting the rotary member 770 may be provided on the upper side of the 'T' shape. The rotary member 770 is rotatably supported on the rotary shaft and is coupled to another vertical frame 17. And a rotation movable part 772 which is in contact with the trip plate 730 in a direction opposite to the rotation axis can be extended. On the upper side of the rotating member 770, a latch pressing portion 774 for pushing the latch portion 570 is formed on the left side with reference to FIG.

The rotary movable part 772 extends from the rotary member 770 in the form of a cantilever. In the state before the manual tripping, the right side of the rotating movable part 772 comes into contact with one surface of the trip plate 730 with reference to FIG.

The latch pressing portion 774 is provided on the upper side of the rotary movable portion 772 and the projection 774a is protruded outward on the left upper end. The projection 774a is a portion for pushing up the latch portion 570 when the rotary member 770 is rotated. The latch pressing portion 774 has a shape that is in point contact or face contact with the lower end of the latch portion 570.

The manual trip mechanism of the DC breaker according to an embodiment of the present invention having the above-described shape may be used for safety when there is a change in position, such as pull-in or pull-out, It can trip. The operation status of each configuration at the time of manual trip is as follows.

FIG. 7 is a view illustrating a cam portion when a manual trip of a DC breaker according to an embodiment of the present invention. FIG. 8 is a view illustrating a time point at which a DC circuit breaker is manually tripped according to an embodiment of the present invention. 9 is an enlarged view of the cam portion of the DC breaker according to Fig. 10 is an enlarged view of a latch portion of the DC breaker according to FIG. 11 is a view illustrating a state in which the DC circuit breaker is manually tripped according to an embodiment of the present invention.

As shown in Figs. 7 and 9, an external force is applied in the direction of the left arrow in Fig. 7 at the time of the manual trip. At this time, the horizontal rod 742 is pressed in the direction of the arrow from left to right in Fig. 7, and the slip plate 744 moves to the right.

The slope plate 744 moves and the slope 744a moves to the right side while pushing down the trip pin 752. [ The effect that the trip pin 752 moves to the left along the inclined plane occurs while the inclined plane 744a moves to the right.

The sloping surface 744a moves away from the pinching step 744b toward the upper side, so that the trip pin 752 rises as the slip plate 744 moves. As the trip pin 752 rises, the vertical load 750 also rises.

As the vertical rod 750 rises, the cam rotation pin 754 also rises together, and the cam member 760 rotates by the rise of the cam rotation pin 754.

When the cam member 760 rotates, the trip shaft 720 rotates in conjunction with the rotation of the cam member 760. [ 8 and 10, the trip plate 720 rotates together with the trip plate 730 connected to the trip shaft 720, as shown in FIG.

The trip plate 730 presses the rotary member 770 while the trip plate 730 rotates and the end of the trip plate 730 rotates the rotary movable portion 772 in the direction of the arrow. At this time, an imaginary line passing through the rotational center axis of the trip shaft 720 is parallel to the rotational center axis of the rotational member 770 and is spaced apart by a predetermined distance (see FIG. 10).

The rotary pushing portion 774 of the rotary member 770 rotates in the direction of the arrow in Fig. 10 while the rotary movable portion 772 rotates. The projection 774a pushes up the latch portion 570 upward as the latch pressing portion 774 rotates.

The latch portion 570 is held by the latch engagement pin 332 by the latch amount H so that when the latch portion 570 is pushed upward by the latch amount H by the projection 774a, The latching jaw 572 can be disengaged from the latching engagement pin 332. [ As a result, the engagement between the latch portion 570 and the latch engagement pin 332 is released, so that the temporarily fixed state of the mover 300 is released.

When the fixed state of the mover 300 is released, the return spring 370 is restored and the second movable bracket 330 of the mover 300 is pulled. The second movable bracket 330 is pulled and rotated about the mover rotation axis 350. [ Since the direction of rotation of the second movable bracket 330 is the direction toward the return spring 370, the second movable bracket 330 rotates to the left with reference to Fig.

The movable contact 312 of the first movable bracket 310 is moved away from the stationary contact 110 of the stator 100 and the DC breaker 10 is tripped while the second movable bracket 330 is rotated to the left.

With this structure, the DC breaker 10 can be manually tripped even when the abnormal current is not generated, thereby improving workability and efficiency.

In addition, since the present invention realizes a manual trip with a simple structure, the number of components can be reduced and the assembling performance of the circuit breaker can be improved.

In the above embodiment, the trip shaft 720 and the trip plate 730 are coupled to each other. However, the trip shaft 720 'and the trip plate 730' may be integrally formed.

12 is a view showing a trip shaft of a DC breaker according to another embodiment of the present invention.

12, the trip shaft 720 'and the trip plate 730' may be integrally formed by a method such as injection molding or double injection molding. In this case, the engagement pin or the like for coupling the trip plate 730 'can be eliminated, and the number of parts can be reduced.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, But the present invention is not limited thereto.

10: DC breaker 100: Stator
110: fixed contact 300: mover
310: first movable bracket 312: movable contact
330: second movable bracket 332: latching pin
350: mover rotation axis 370: return spring
500: input device 510: push rod
570: latch portion 572: latching jaw
700: Manual trip mechanism 710: Trip frame
720: trip shaft 730: trip plate
740: Trip member 742: Horizontal rod
744: Slip plate 750: Vertical load
752: trip pin 754: cam rotation pin
760: cam member 762: slot
770: rotating member 772:
774: Latch pressing portion 774a:

Claims (13)

An enclosure forming the appearance;
A stator having a fixed contact and installed at one side of the enclosure;
A mover provided inside the housing facing the stator and having a movable contact electrically contacted with the fixed contact selectively;
A closing device installed on one side of the enclosure adjacent to the mover, for temporarily fixing the mover so that the movable contact comes into contact with the fixed contact by an input force inputted from the outside;
An overcurrent trip device installed inside the enclosure opposite to the charging device and automatically tripping the mover from the stator when an abnormal current is generated; And
And a manual trip mechanism for separating the trip device from the mover by applying an external force from the outside of the enclosure when a trip is required except for the occurrence of the abnormal current,
The manual trip mechanism
A trip member which is partially exposed to the outside of the enclosure and receives an external force;
A vertical rod which is inserted into a lower surface of the enclosure and whose other end extends upwardly and which is partly in contact with the trip member and ascends and descends by the trip member,
A cam member rotatably coupled to the vertical rod at one side thereof and rotated by the vertical rod,
And a trip shaft having one end fixed to the cam member and the other end rotatably extended to rotate in conjunction with the rotation of the cam member
DC breaker. The method according to claim 1,
The charging device
A push rod which is partially exposed by the enclosure to receive the closing force,
And a latch portion that holds the mating body in a coupled state by the applying force received by the push rod
DC breaker. 3. The method of claim 2,
The mover
A first movable bracket having the movable contact,
A second movable bracket coupled to the first movable bracket and rotatably coupled to one side of the enclosure, the second movable bracket having a latch engaging pin projecting from the latch engaging pin;
A mover rotatable shaft for rotatably supporting the second movable bracket,
And a return spring which is installed in a state where one end is coupled to the second movable bracket and the other end is coupled to one side of the enclosure and the movable contact and the fixed contact are in contact with each other,
DC breaker. The method of claim 3,
The latch portion
And a latching jaw which is engaged with the outer circumferential surface of the latching engagement pin
DC breaker. 5. The method of claim 4,
The engagement jaw
(H) than the radius of the latch engagement pin
DC breaker. The method of claim 3,
The return spring
And one end coupled to the second movable bracket is coupled to a position higher than the other end coupled to the enclosure
DC breaker. 6. The method of claim 5,
The manual trip mechanism
And a rotating member rotatably installed adjacent to the latch portion and rotating in the direction of the latch portion by the trip shaft when the trip shaft rotates
DC breaker. 8. The method of claim 7,
The manual trip mechanism
A trip frame coupled to a lower surface of the enclosure to pivotally support the trip shaft,
And a trip plate coupled to the trip shaft or integrally formed to press the rotary member
DC breaker. 9. The method of claim 8,
The trip member
A horizontal rod having one end exposed to the outside of the enclosure and receiving the external force,
And a slip plate formed at the other end of the horizontal rod and having a slope in a direction toward the vertical rod,
The vertical rod
A cam rotation pin formed adjacent to the lower surface of the enclosure and protruding toward the cam member,
And a trip pin protruding toward the slip plate at the other end extended upwardly
DC breaker. 10. The method of claim 9,
When the external force is applied to the horizontal rod, the slip plate moves toward the vertical rod, and the slope moves upward to move the vertical rod upward
DC breaker. 11. The method of claim 10,
The cam member
A slot formed in a portion separated from the coupled portion of the trip shaft and inserted into the cam rotation pin,
As the vertical rod rises, the cam member rotates
DC breaker. 12. The method of claim 11,
The rotating member
'T' shape,
A rotary movable part extending in a cantilevered form and being pressed by the trip plate and rotating in the direction of the latch part,
And a latch pressing portion which is protruded to be rotated toward the latch portion by the rotationally movable portion and presses the latch portion in a direction in which the latch portion is disengaged from the latch engagement pin
DC breaker. 13. The method of claim 12,
The latch portion
And is disengaged from the latch engagement pin when pressed by the projection of the latch pressing portion,
The return spring
When the latch portion is disengaged, the mover is separated from the stator
DC breaker.

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