KR100480389B1 - Interlock apparatus for draw-out type circuit breaker - Google Patents

Abstract

The present invention relates to an interlock device of a draw-out circuit breaker, comprising: a main circuit portion for opening and closing a bus side and a load side of a cradle, a mechanism portion for driving the main circuit portion, and a relative movement of the main circuit portion and the mechanism portion with respect to the cradle. An interlock device of a draw-out circuit breaker having a bogie unit, the locking position protruding from the bogie unit toward the cradle to prevent movement of the bogie unit, and the bogie from the lock position to allow movement of the bogie unit. An interlock shaft disposed in the trolley so as to be movable between release positions which are withdrawn from the bottom; A slider which is slidably arranged between a stop position for preventing the retraction of the interlock shaft when the main circuit portion is inserted and a allowable position allowing the interlock shaft to move to the release position when the main circuit portion is tripped; One side is rotatably coupled to the opening and closing shaft for opening and closing the main circuit portion, the other side is characterized in that it comprises a drive arm extending along the radial direction of the opening and closing shaft for sliding the slider when the opening and closing shaft rotates. Thereby, an interlock device of the draw-out circuit breaker can be secured by ensuring the reliability of the operation which reliably restrains the interlock shaft when the main circuit part is inserted.

Description

Interlock device for draw-out circuit breaker {INTERLOCK APPARATUS FOR DRAW-OUT TYPE CIRCUIT BREAKER}

The present invention relates to an interlock device of a draw-out circuit breaker, and more particularly, to a safety of the draw-out circuit breaker that ensures the reliability of the operation that reliably restrains the interlock shaft when the main circuit part is inserted. It relates to an interlock device.

1 is a side view of a conventional drawout circuit breaker, FIG. 2 is an enlarged view of the interlock device region of FIG. 1, and FIG. 3 is a side view of FIG. As shown in these figures, the lead-out circuit breaker 11 includes a plurality of contacts 15 which are in contact with the bus side 14 and the load side 16, respectively, and thus the bus side 14 and the load side 16. The main circuit part 13 which electrically opens and closes this mutually, the drive part 21 provided with the drive mechanism so that the main circuit part 13 can be mechanically driven, and the contactor 15 of the main circuit part 13 are a bus side. And a cart 25 for moving away from the load side 16.

The cradle 31 is arranged along the up and down direction of an enclosure (not shown) to partition the internal space into a busbar chamber and a circuit breaker chamber, respectively, and a low barrier for releasably supporting the circuit breaker 11. The plate part 34 is comprised.

A plurality of openings are formed in the partition 33 so that each contactor 15 of the circuit breaker 11 can be inserted, and a shutter 37 is provided in the front region of the opening to open and close the opening. A plurality of connecting terminals 38 are provided in the inner bus chamber of the opening so that each contactor 15 of the circuit breaker 11 can be inserted and connected to the bus side 14 and the load side 16, respectively.

On the other hand, the circuit breaker 11 is provided with an interlock device 101 to prevent the circuit breaker 11 from being moved relative to the cradle 31 at the operation position and the test position. The interlock device 101 of the lead-out circuit breaker is interlock shaft 103 which protrudes and withdraws from the trolley portion 25 toward the bottom plate portion 34 of the cradle 31 along the vertical direction of the trolley portion 25. And, an actuating arm 26 which is integrally rotatable with the opening / closing shaft 23 of the driving unit 21, and an acting pin 27 coupled to the end of the actuating arm 26 to press the contact spring 28. And, the interlock plate 117 is rotated in conjunction with the interlock shaft 103, and is formed in the form of both arm arms rotatable around the pivot shaft 123 disposed in parallel with the opening and closing shaft 23, one side acts The action lever 121 which contacts the pin 27 and prevents the interlock shaft 103 from moving upward from the locked position by preventing the rotation of the interlock plate 117 when the main circuit part 13 is inserted. Consists of

The actuating lever 121 is spaced apart from the interlock plate 117 at the tripping position of the opening and closing shaft 23 on the pivot shaft 123 of the actuating lever 121 to allow the interlock plate 117 to rotate. One side of the lever spring 127 of the torsion spring type to rotate the 121 is coupled, the spring lever 125 is formed on the action lever 121 so that the other end of the lever spring 127 can be contacted.

The central region of the interlock shaft 103 is provided with a shaft spring 107 for applying an elastic force so that the interlock shaft 103 can protrude toward the cradle 31 side, and one side of the interlock shaft 103 is transverse in the longitudinal direction. The shaft handle 108 is formed to protrude. One side of the shaft handle 108 protrudes in a direction opposite to the protruding direction of the shaft handle 108, and an end thereof is connected to the interlock plate 117 so that the interlock plate 117 can rotate in movement when the interlock shaft 103 is moved. The connecting pin 109 is formed.

One side of the interlock shaft 103 is provided with a micro switch 41 so as to detect the position when the interlock shaft 103 is inserted and tripped, the upper end of the interlock shaft 103 at the top of the interlock shaft 103 The sensing roller 13 is installed to be in contact.

On the other hand, the cradle 31 is provided with a cradle interlock plate 39 formed with a shaft hole 40 so that the lower end of the interlock shaft 103 can be inserted at the operation position and the test position of the circuit breaker 11. .

By such a configuration, when the circuit breaker 11 is positioned at the operation position or the test position, the interlock shaft 103 protrudes toward the cradle 31 by the elastic force of the shaft spring 107 and the cradle interlock plate 39 is provided. It is inserted into the shaft hole 40 formed in the balance portion 25 to suppress the relative movement with respect to the cradle (31).

At the operation position of the circuit breaker 11, when the opening and closing shaft 23 is rotated along the counterclockwise direction in FIG. 2 to the input position of the main circuit unit 13, the acting pin 27 is moved upward, and the acting pin 27 The working lever 121 pressed by one side is rotated counterclockwise around the rotation axis by the elastic force of the lever spring 127 so that one side is disposed in front of the rotation direction of the interlock plate 117. In this state, when the shaft handle 108 is moved upward, the interlock plate 117 is in contact with one side of the actuating lever 121 to prevent rotation, thereby preventing the interlock shaft 103 from moving upward. The circuit breaker 11 is prevented from moving relative to the cradle 31 at the closing position of the circuit unit 13.

On the other hand, during the trip of the main circuit unit 13, the interlock shaft 103 is separated from the shaft hole 40 and moved upwards, so that the circuit breaker 11 is movable, and at this time, the interlock plate 117 Is rotated about the rotation shaft 118 to block the manual injection port 130 to prevent manual injection, the micro switch 41 is opened and closed not shown when the sensing roller 13 is in contact with the upper end of the interlock shaft 103 The input coil for rotating the shaft 23 cannot be electrically operated to prevent the input of the main circuit unit 13.

By the way, in the conventional interlock device of the draw-out circuit breaker, the actuating lever 121 is applied to the elastic force of the lever spring 127 formed in the form of a relatively weak torsion spring when the opening and closing shaft 23 is rotated to the closing position. When the elastic force of the lever spring 127 is reduced or foreign matter is inserted into the operating part of the actuating lever 121 to generate a resistance force greater than the elastic force of the lever spring 127, the interlock plate 117 The action lever 121 may not rotate correctly to a position that prevents rotation. If the interlock shaft 103 is separated from the shaft hole 40 because the action lever 121 does not rotate to the correct position, it may lead to an accident.

Accordingly, it is an object of the present invention to provide an interlock device of a draw-out circuit breaker that can ensure safety by ensuring the reliability of the operation that reliably restrains the interlock shaft when the main circuit portion is inserted.

According to the present invention, the object is in contact with the busbar side and the load side of the cradle, respectively, the main circuit portion for opening and closing the busbar side and the load side, the mechanism portion for driving the main circuit portion, the main circuit portion and the mechanism portion the cradle An interlock device of a drawer type circuit breaker which prevents the cart portion from being moved relative to the cradle when the drawer type circuit breaker having a cart portion relatively moved relative to the cradle is provided, protruding from the cart portion toward the cradle. An interlock shaft disposed in the trolley so as to be movable between a locking position for preventing movement of the trolley portion and a release position withdrawn from the locking position to the trolley portion to allow movement of the trolley portion; A stop position disposed in front of the retraction direction of the interlock shaft when the main circuit portion is inserted, and a allowable position to allow movement of the interlock shaft to the release position when the main circuit portion is tripped; A slider arranged to slidably move the liver; One side is pulled out integrally coupled to the opening and closing shaft for opening and closing the main circuit portion and the other side extends along the radial direction of the opening and closing shaft includes a drive arm for sliding the slider when rotating the opening and closing shaft Achieved by an interlock device of a circuit breaker.

Here, the driving arm preferably further comprises a slider returning means for pressing the slider when the main circuit portion is inserted to slide to the stop position, and returning the slider to the allowable position when the main circuit portion trips. .

It is effective that the slider return means is a tension spring provided to be stretchable along the moving direction of the slider.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention.

4 is a side view of the interlock device of the drawout circuit breaker according to the exemplary embodiment of the present invention, FIG. 5 is a side view along the direction A of FIG. 4, FIG. 6 is a side view of FIG. 5, and FIG. 7 is of FIG. 4. It is a figure which shows the state at the time of a trip. The same and equivalent parts as those described above and shown in the drawings will be described with the same reference numerals for convenience of description. As shown in these figures, the interlock device of the pull-out circuit breaker has a locking position projecting from the cart portion 25 of the circuit breaker 11 toward the cradle 31 and the cart portion from the cradle 31. The interlock shaft 51 provided in the circuit breaker 11 so as to be movable between the release positions withdrawn to 25 and the interlock shaft 51 to prevent the interlock shaft 51 from being moved to the retracted position when the main circuit unit 13 is inserted. Slider 61 is arranged to be slidably moved between the stop position and the allowable position allowing the interlock shaft 51 to be moved to the retracted position, and one side is integral to the opening and closing shaft 23 for opening and closing the main circuit portion 13. It is rotatably coupled to the other side is configured to include a drive arm 73 extending along the radial direction of the opening and closing shaft 23 to slide the slider 61 when the opening and closing shaft 23 rotates.

An opening and closing shaft 23 is rotatably installed in the circuit breaker 11 so as to open and close the main circuit unit 13, and one side of the driving arm 73 is rotatably integrally formed on the opening and closing shaft 23. Are combined.

One end of the slider 61 is arranged in contact with the end of the driving arm 73 in a protruding direction, and a slider support for slidably supporting the slider 61 on one side in the thickness direction of the slider 61. The member 67 is provided along the up-down direction. On the opposite side of the slider support member 67 with the slider 61 interposed therebetween, a pair of release preventing members 69 are slidably in contact with the side surfaces of the slider 61 to prevent the slider 61 from being separated. It is coupled by bolts 70.

A long hole-shaped bolt hole is formed in the center area of the slider 61 to accommodate the support bolt 70, and one side of the slider 61 has a spring to support one end of the return spring 71 to be described later. The support part is formed.

On the upper side of the slider 61, a return spring 71 is disposed so as to be able to expand and contract along the moving direction of the slider 61 and to apply an elastic force to return the slider 61 to the allowable position. The return spring 71 is configured in the form of a tension coil, one end of which is fixed to the upper region of the slider support member 67 and the other side of which is connected to the spring support 64.

On the other hand, the interlock shaft 51 is disposed in the circuit breaker 11 so as to be movable along the vertical direction, the interlock shaft 51 of the cradle interlock plate 39 in the central region of the interlock shaft 51. The shaft spring 55 that applies an elastic force to be accommodated in the shaft hole 40 is coupled. A shaft handle 52 protruding horizontally in the longitudinal direction of the interlock shaft 51 is provided at the lower side of the shaft spring 55, and the interlock shaft 51 at the upper side of the shaft spring 55 toward the slider 61. A stopper pin 54 is formed to protrude horizontally in the longitudinal direction thereof to contact the slider 61 to prevent upward movement of the interlock shaft 51.

One side of the interlock shaft 51 is provided with a micro switch 41 to detect the position of the interlock shaft 51 so that the input coil is not electrically operated, the interlock shaft 51 on the upper side of the interlock shaft 51. The detection roller 13 which is in contact with the upper end of the interlock shaft 51 at the release position of the sensor and detects the position of the interlock shaft 51 is installed.

By such a configuration, when the circuit breaker 11 is positioned at the operation position or the test position, the interlock shaft 51 protrudes downward by the elastic force of the shaft spring 55, so that the shaft hole of the cradle interlock plate 39 is formed. By being inserted into 40, the circuit breaker 11 is restrained from being moved relative to the cradle 31.

In this state, when the opening and closing shaft 23 is rotated to the input position, the driving arm 73 rotates integrally with the opening and closing shaft 23, as shown in Figure 4 to press the one end of the slider 61 , The pressed slider 61 is slid so that the other end is located above the stopper pin 54 to suppress the interlock shaft 51 from moving upward to the withdrawn position. At this time, the return spring 71 is tensioned to accumulate the elastic force.

On the other hand, when the opening and closing shaft 23 is rotated to the trip position, the driving arm 73 is rotated along the counterclockwise direction of the drawing, as shown in Figure 7, the slider 61 of the return spring 71 The accumulated elastic force causes the sliding movement to the allowable position. When the interlock shaft 51 is moved upward by operating the shaft handle 52, the lower end of the interlock shaft 51 is separated from the shaft hole 40, and the circuit breaker 11 is relatively movable with respect to the cradle 31. It becomes a state. When the interlock shaft 51 is moved to the release position and the upper end contacts the sensing roller 13, the micro switch 41 prevents the input coil driving the opening and closing shaft 23 from being electrically operated. Should be prevented.

As described above, according to the present invention, the interlock shaft is disposed in the circuit breaker so as to be movable between a lock position protruding from the circuit breaker to the cradle side and suppressing movement of the circuit breaker and a release position withdrawn from the lock position to the circuit breaker side. Slidably disposed between the stop position for preventing the retraction of the interlock shaft and the allowable position for allowing movement of the interlock shaft to the retracted position when the main circuit portion is inserted in front of the moving direction of the interlock shaft to the retracted position. Arranged slider and one side is integrally rotatable to the opening and closing shaft and the other side is provided with a driving arm for driving the slider to lock the rotational force of the opening and closing shaft rotated with a rotation torque greater than the electromagnetic repulsive force of the high-voltage current interlock shaft By doing this, the reliability and safety of the operation can be ensured There is provided an interlock device for a draw-out circuit breaker.

1 is a side view of a conventional drawout circuit breaker,

2 is an enlarged view of the interlock device region of FIG. 1;

3 is a side view of FIG.

4 is a side view of an interlock device of a drawout circuit breaker according to an embodiment of the present invention;

Figure 5 is a side view along the direction A of Figure 4,

6 is a side view of FIG. 5;

FIG. 7 is a diagram illustrating a trip state of FIG. 4.

Explanation of symbols on the main parts of the drawings

11: circuit breaker 13: main circuit

21: drive unit 23: opening and closing shaft

25: loan 31: cradle

39: cradle interlock plate 40: shaft ball

41: micro switch 51: interlock shaft

52: shaft handle 52: action pin

61: slider 67: slider support member

70: support bolt 71: return spring

73: driving arm

Claims (3)

And a main circuit portion which contacts the busbar side and the load side of the cradle, respectively, to open and close the busbar side and the load side, a mechanism portion for driving the main circuit portion, and a bogie portion for moving the main circuit portion and the mechanism portion relative to the cradle. An interlock device of a draw-out circuit breaker which prevents the cart portion from moving with respect to the cradle when the draw-out circuit breaker is inserted, wherein the locking position protrudes from the cart portion toward the cradle to prevent movement of the cart portion. And an interlock shaft disposed in the balance portion so as to be movable between the release positions withdrawn from the locking position to the balance portion to enable movement of the balance portion. A stop position disposed in front of the retraction direction of the interlock shaft when the main circuit portion is inserted, and a allowable position to allow movement of the interlock shaft to the release position when the main circuit portion is tripped; A slider arranged to slidably move the liver; One side is pulled out integrally coupled to the opening and closing shaft for opening and closing the main circuit portion and the other side extends along the radial direction of the opening and closing shaft includes a drive arm for sliding the slider when rotating the opening and closing shaft Interlock device of circuit breaker. The method of claim 1, The driving arm further includes a slider returning means for pressing the slider when the main circuit portion is inserted and slidingly moving to the stop position, and returning the slider to the allowable position when the main circuit portion is tripped. Interlock device of circuit breaker. The method of claim 2, And the slider returning means is a tension spring that is elastically disposed along the moving direction of the slider.