WO2020222345A1

WO2020222345A1 - Circuit breaker

Info

Publication number: WO2020222345A1
Application number: PCT/KR2019/005503
Authority: WO
Inventors: 김종우; 서치원; 김선진
Original assignee: 인텍전기전자주식회사
Priority date: 2019-05-02
Filing date: 2019-05-08
Publication date: 2020-11-05
Also published as: CN112136199B; KR20200127510A; CN112136199A; KR102191196B1

Abstract

A circuit breaker is disclosed. A circuit breaker, according to an embodiment of the present invention, comprises: a blocking unit comprising a fixed contact unit and a movable contact unit; an output shaft which rotates in an insertion or opening direction by means of operation of a manipulator and transmits power for an insertion or opening operation of the movable contact unit; and a bouncing suppressing device for suppressing bouncing when the movable contact unit is opened. The bouncing suppressing device comprises: a first rotary member which is fixed to the output shaft and has a locking protrusion at a position radially spaced apart from the center of rotation; and a second rotary member which has a locking groove where the locking protrusion enters when the first rotary member rotates in the opening direction, and onto which the locking protrusion latches while rotating by means of the impact of the locking protrusion so as to restrict backward movement of the locking protrusion.

Description

breaker

The present invention relates to a circuit breaker capable of quickly cutting off a current when the blocking portion is opened.

A circuit breaker is installed on a transmission line or distribution line to open and close a normal load when necessary, and when an accident current such as overcurrent or short circuit current occurs, it can automatically cut off the line to protect the load-side device or wire.

A typical circuit breaker is a fixed contact part to which the supply side line is connected, a movable contact part to which the load side line is connected, a manipulator that closes or opens the movable contact part at high speed to supply or cut off current, and the arc generated when the movable contact part is opened. It includes an arc extinguishing part to extinguish.

Such a circuit breaker may cause a delay in blocking the current due to an arc generated when the movable contact part is opened or a bouncing operation of the movable contact part.

The arc generated when the movable contact is opened is proportional to the current strength. Therefore, if the current intensity of the circuit breaker is large and the arc generated when the movable contact part is opened is large, the current can be easily cut off because the arc can be easily induced to the arc extinguishing part. However, when the current intensity of the circuit breaker is small and the arc generated when the movable contact part is opened is small, the arc is not easily guided to the arc extinguishing part, and the current blocking may be delayed.

The bouncing of the movable contact portion is a phenomenon in which the movable contact portion rotates in the open direction at high speed and is stopped by a repulsive force. This phenomenon delays the interruption of the current because it causes the arc to re-ignite.

The delay of arc extinguishing generates high heat, and can reduce the blocking performance by deteriorating the performance of the cooling device and cutting surface of the arc extinguishing part.

An aspect of the present invention is to provide a circuit breaker capable of quickly cutting off current by suppressing the bouncing operation when the movable contact portion is opened to prevent re-ignition of the arc.

Another aspect of the present invention is to provide a circuit breaker capable of quickly extinguishing the arc by inducing the arc generated when the movable contact portion is opened to the arc extinguishing portion.

According to an aspect of the present invention, a blocking portion having a fixed contact portion and a movable contact portion; An output shaft that rotates in an input or open direction by an operation of a manipulator and transmits power for an input or open operation of the movable contact unit; And a bouncing suppressing device for suppressing bouncing when the movable contact part is opened, wherein the bouncing suppressing device is fixed to the output shaft and includes a first rotating member provided with a locking protrusion at a position radially spaced from the rotation center; And a second rotating member having a locking groove into which the locking protrusion enters when the first rotating member is rotated in the opening direction, and rotating by the hit of the locking protrusion, and hooking the locking protrusion to limit the reverse movement of the locking protrusion. A circuit breaker may be provided.

The bouncing suppression device includes a fixing plate fixed to the outside of the blocking part; And a support shaft that is installed on the fixing plate while being spaced apart from the output shaft, the axis line is disposed parallel to the axis line of the output shaft, and rotatably supports the second rotating member.

The bouncing inhibiting device may further include a restoring spring for imparting elasticity to rotate the second rotating member to an initial position.

A distance between the output shaft and the support shaft may be greater than a distance between the output shaft and the locking protrusion.

The locking groove is opened toward the edge of the second rotating member and positioned to coincide with the turning trajectory of the locking protrusion while the second rotating member is rotated to an initial position; A first locking part provided at one side of the inlet and hit by the locking protrusion entering the inlet; And a second locking part provided on the other side of the entrance and configured to engage the locking protrusion when the second rotating member rotates by the hit of the locking protrusion to limit the reverse movement of the locking protrusion.

The second rotating member is provided in a flat plate shape, and the locking groove may include an inlet open toward an edge of the second rotating member so that the locking protrusion enters and engages.

The second rotation member may release the restraint of the locking protrusion after the opening operation of the movable contact part is completed, thereby allowing the output shaft to rotate in the input direction.

The blocking unit may include a first blocking unit and a second blocking unit disposed in succession in a first direction, and the output shaft extends long in the first direction, and power of the operation unit is supplied to the first and second blocking units. Can be delivered at the same time.

The circuit breaker includes: a first blow coil disposed between the first blocking unit and the second blocking unit; A second blow coil disposed to face the first blow coil with the first blocking portion therebetween; And a third blow coil disposed to face the first blow coil with the second blocking part therebetween.

The first and second blow coils generate a first magnetic flux between the first and second blow coils to move the arc generated when the first cut-off part is opened in a second direction above the first cut-off part. have.

The first and third blow coils generate a second magnetic flux between the first and third blow coils to move the arc generated when the second cut-off part is opened in a second direction above the second cut-off part. have.

The circuit breaker may further include a connecting member connecting the movable contact part of the first cut-off part and the fixed contact part of the second cut-off part to connect the first cut-off part and the second cut-off part in series.

Power having a first polarity may be applied to the fixed contact portion of the first blocking portion, and a power having a second polarity opposite to the first polarity may be applied to the movable contact portion of the second blocking portion.

The first terminals to which the power of the first polarity is applied from the first to third blow coils are connected to the fixed contact portion of the second blocking unit, and the second polarity power is applied from the first to third blow coils. The two terminals may be connected to the movable contact portion of the second blocking portion.

Current flows from the fixed contact part to a third direction, which is a direction of the movable contact part, the first magnetic flux is formed in the first direction from the second blow coil to the first blow coil, and the second magnetic flux is The arc is formed in the first direction from the second blow coil to the third blow coil direction, and the arc generated in the first and second cut-off portions is perpendicular to the first and third directions according to Fleming's left hand rule. It can be moved in two directions.

When a voltage of a first level is applied to the first and second cut-offs from a power supply, when the first and second cut-offs are open, the first to third blow coils have a voltage of the first level and the first level. A voltage of a third level corresponding to a voltage difference between voltages of the second level applied to the first cut-off portion may be applied.

When a voltage of a first level is applied from a power supply to the first and second cut-off parts, if the first and second cut-off parts are in a closed state, the first to third blow coils may be maintained at a zero potential state.

The first blocking portion and the second blocking portion may include a housing and an arc extinguishing portion disposed above the housing to extinguish an arc.

The first blow coil is accommodated in a groove respectively formed in the housing side of the first blocking portion and the housing side of the second blocking portion facing each other, and the second blow coil is formed on the other side of the housing of the first blocking portion. A portion may be accommodated in the groove, and a portion of the third blow coil may be accommodated in a groove formed on the other side of the housing of the second blocking portion.

According to another aspect of the present invention, the output shaft rotates in the input or open direction by the operation of the manipulator, and transmits power for the input or open operation of the blocking unit; And a bouncing suppressing device for suppressing bouncing when the blocking part is opened, wherein the bouncing suppressing device comprises: a first rotating member fixed to the output shaft and provided with a locking protrusion at a position radially spaced from the center of rotation; And a second rotating member having a locking groove into which the locking protrusion enters when the first rotating member rotates in the opening direction, and is rotated by the hit of the locking protrusion while hooking the locking protrusion to limit the reverse movement of the locking protrusion. A circuit breaker comprising may be provided.

In the circuit breaker according to an embodiment of the present invention, when the movable contact part is opened, the bouncing suppression device suppresses the bouncing operation of the movable contact part to prevent re-ignition of the arc, so that current can be quickly cut off.

In the circuit breaker according to an embodiment of the present invention, since the blow coil induces the arc generated when the movable contact portion is opened to the arc extinguishing portion, the arc can be easily extinguished and the current can be quickly cut off.

In the circuit breaker according to an embodiment of the present invention, since a plurality of blocking units disposed adjacent to each other share the blow coil, the need for the blow coil can be reduced, and thus the volume and manufacturing cost of the circuit breaker can be minimized.

The circuit breaker according to the embodiment of the present invention does not require a separate power supply device because the blow coil is driven by power supplied to the circuit breaker, thereby minimizing the volume and manufacturing cost of the circuit breaker.

The circuit breaker according to the embodiment of the present invention can prevent failure or accident due to an error in power connection when installing the circuit breaker because the direction of the current and the direction of the magnetic flux formed by the blow coil are also changed when the polarity of the power is changed. I can.

1 is a perspective view of a circuit breaker according to an embodiment of the present invention.

2 is a perspective view showing a first cut-off part of a circuit breaker according to an embodiment of the present invention separated.

3 is an exploded perspective view of the first blocking portion shown in FIG. 2.

4 is a cross-sectional view of a first blocking portion shown in FIG. 2.

5 shows a direction in which an arc is induced by the action of the first and second blow coils in a circuit breaker according to an embodiment of the present invention.

6 shows an example in which a blow coil is installed when a plurality of blocking units are continuously installed in a circuit breaker according to an embodiment of the present invention.

7 conceptually shows the configuration of a circuit breaker according to an embodiment of the present invention.

8 conceptually shows a circuit of a circuit breaker according to an embodiment of the present invention.

9 is a perspective view of a device for suppressing bouncing of a circuit breaker according to an embodiment of the present invention.

10 is an exploded perspective view of a device for suppressing bouncing of a circuit breaker according to an embodiment of the present invention.

11 to 13 show step by step the operation of the bouncing suppression device of the circuit breaker according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following examples are presented in order to sufficiently convey the spirit of the present invention to those of ordinary skill in the art to which the present invention pertains. The present invention is not limited only to the embodiments presented herein, but may be embodied in other forms. In the drawings, in order to clarify the present invention, portions not related to the description may be omitted, and sizes of components may be somewhat exaggerated to help understanding.

Referring to FIG. 1, a circuit breaker according to an embodiment of the present invention includes a blocking unit 100, a support frame 200, an output shaft 300, a manipulator 400, and a bouncing suppression device 500.

The blocking unit 100 supplies current when input and blocks the current when opened. The blocking unit 100 may open or close a normal load by an input or open operation when necessary, and may automatically open and block a line when an accident current such as an overcurrent or a short circuit current occurs.

As shown in FIG. 1, a plurality of blocking parts 100 may be continuously installed in the width direction (X direction). The first to eighth blocking portions 100a to 100h may be continuously arranged in a state in which the side surfaces are in contact. The first to eighth blocking portions 100a to 100h are connected to the manipulator 400 by the output shaft 300, respectively, and thus may be simultaneously input or opened by the operation of the manipulator 400. 1 shows a case where eight blocking units are continuously installed as an example, but the number of blocking units may be changed as necessary. There may be one or more blocking portions.

The support frame 200 binds the first to eighth blocking portions 100a to 100h arranged horizontally, and stably supports the first to eighth blocking portions 100a to 100h. The lower part of the support frame 200 may be firmly fixed to a support structure (not shown) so as not to shake when the blocking part 100 is inserted or opened.

The manipulator 400 provides power to rotate the output shaft 300 in the input or open direction (in a direction opposite to the input) for the input or open operation of the first to eighth blocking portions 100a to 100h. The manipulator 400 may employ hydraulic pressure, pneumatic pressure, metal springs, etc. as a driving source to realize instantaneous input and opening, and may be operated by manual operation or remote control. The manipulator 400 may be mounted on the left and right middle portions of the support frame 200 as shown in FIG. 1 in consideration of power distribution to the first to eighth blocking portions 100a to 100h.

The output shaft 300 is connected to the manipulator 400. The output shaft 300 extends long in the longitudinal direction (X direction) of the support frame 200 and may be rotatably supported on the front side of the support frame 200. The output shaft 300 rotates in the input or open direction by the operation of the manipulator 400, and is connected to the first to eighth blocking portions 100a to 100h by a plurality of link devices 310.

A plurality of link devices 310 connecting the output shaft 300 and the first to eighth blocking portions 100a to 100h are fixed to the output shaft 300 and rotate together with the output shaft 300, as shown in FIG. 4. It includes a rotating link 311 and an advance and retreat link 312 connecting the movable contact portion 130 in each blocking portion.

The plurality of link devices 312 convert the rotational motion of the output shaft 300 into an advancing and retreating motion, and transmit the conversion to the movable contact part 130. Therefore, when the output shaft 300 is rotated in the input or open direction by the operation of the manipulator 400, the first to eighth cut-off portions 100a to 100h are operated in the input or open direction of the movable contact unit 130 to reduce current. Supply or cut off.

2 to 4 show the first blocking portion 100a. Since the first to eighth blocking portions 100a to 100h are of the same shape, the first blocking portion 100a will be mainly described in relation to the configuration of the blocking unit.

2 to 4, the first blocking portion 100a includes a housing 110, a fixed contact portion 120, a movable contact portion 130, an arc extinguishing portion 140, a first blow coil 610, and It includes a second blow coil (620).

The housing 110 accommodates the fixed contact portion 120 and the movable contact portion 130. The upper part of the housing 110 on which the arc extinguishing part 140 is mounted is opened so that the arc generated during the opening operation of the movable contact part 130 can move upward. The housing 110 may be configured by a combination of the first housing 111 and the second housing 112 that can be separated into both sides.

The housing 110 has a groove 115 formed on the first side 113 to allow a part of the first blow coil 610 to be inserted, and a second side to allow a part of the second blow coil 620 to be inserted. A groove 116 (see FIG. 6) formed in 114 is provided.

3 and 4, the fixed contact portion 120 may be fixed to the rear side of the housing 110, and the movable contact portion 130 is installed to be movable in the front and rear directions in the front of the housing 110. I can. The movable contact part 130 may have a lower portion rotatably supported by a support shaft 131.

The movable contact unit 130 is connected to the output shaft 300 by a link device 310. Therefore, when the output shaft 300 is rotated in the input direction, the first blocking part 100a moves the movable contact part 130 toward the fixed contact part 120 so that the contact 133 of the movable contact part 130 is moved to the fixed contact part 120. By contacting the contact 123, the circuit is energized. Conversely, when the output shaft 300 rotates in the open direction, the contact 133 of the movable contact part 130 is separated from the contact 123 of the fixed contact part 120 to block the circuit.

The fixed contact part 120 may be connected to a first connection terminal 125 provided outside the rear side of the housing 110, and the movable contact part 130 is a second connection terminal 135 provided outside the rear side of the housing 110. ) Can be connected. Therefore, a first power having a first polarity can be applied to the fixed contact unit 120 from the supply side through the first connection terminal 125, and the supply side through the second connection terminal 135 to the movable contact unit 130 A second power source having a second polarity opposite to the first polarity from may be applied. For example, + power may be applied to the first connection terminal 125 and-power may be applied to the second connection terminal 135.

As shown in FIGS. 3 and 4, the arc extinguishing part 140 is installed on the upper part of the housing 110 and extinguishes the arc induced from the inside of the housing 110. In the case of a fault current, even if the movable contact unit 130 is separated from the fixed contact unit 120, the fault current does not zero by itself, so an arc may occur during the opening process, thereby delaying the blocking of the current. The circuit breaker according to this embodiment guides the arc generated in the housing 110 to the arc extinguishing unit 140 on the upper side of the first blow coil 610 and the second blow coil 620 so that the arc is quickly extinguished. It can implement rapid cut-off of current.

The first blow coil 610 is installed with a part inserted into the groove 115 formed in the first side 113 of the housing 110, and the second blow coil 620 is the housing 110 It is installed with a part inserted into the groove 116 formed in the second side 114 of the.

The first blow coil 610 and the second blow coil 620 generate magnetic flux flowing inside the housing 110 to prevent arcs generated when the movable contact part 130 is separated from the fixed contact part 120. 140). As shown in Fig. 5, the magnetic flux formed by the first and second blow coils 610 and 620 flows from the second blow coil 620 to the first blow coil 610 (X direction), and the current is fixed to the contact part. When flowing from 120 toward the movable contact part 130 (Z direction), the arc generated in the housing 110 moves in the X direction and the Y direction perpendicular to the Z direction according to Fleming's left hand rule. Therefore, the arc can be quickly extinguished by moving to the arc extinguishing unit 140.

In order to form a magnetic flux flowing from the second blow coil 620 to the first blow coil 610, the second blow coil 620 has an N-pole facing the first blow coil 610 and an S opposite side thereof. The first blow coil 610 may be set as an S pole, and the opposite side thereof to the second blow coil 620 may be set as an N pole.

As described above, in the circuit breaker according to the present embodiment, since the first and second blow coils 610 and 620 guide the arc generated when the movable contact part 130 is opened to the arc extinguishing part 140, the current intensity is small and the arc is small. Edo arc can be extinguished easily and current can be cut off quickly.

6 shows an example in which blow coils are installed when the first blocking portion 100a and the second blocking portion 100b are installed to be in continuous contact with each other in the X direction. As shown, the housing 110 of the first blocking portion 100a and the housing 110b of the second blocking portion 100b are

grooves

115, 116, 115b, and 116b for installing blow coils 610, 620, and 630 on both sides, respectively. ).

Therefore, when the first blocking portion 100a and the second blocking portion 100b are installed in succession, the first blow coil 610 may have a side surface of the housing 110 and the second blocking portion 100a facing each other. It may be accommodated in the

grooves

115 and 116b respectively formed on the side of the housing 110b of the blocking portion 100b. That is, a part of the first blow coil 610 is accommodated in the groove 115 on the side of the housing 110 of the first blocking portion 100a, and the side of the housing 110b of the second blocking portion 100b facing the rest It can be accommodated in the groove (116b) formed in. The second blow coil 620 may be partially accommodated in the groove 116 on the other side of the housing 110 of the first blocking portion 100a. Likewise, a portion of the third blow coil 630 facing the first blow coil 610 may be accommodated in the groove 115b on the other side of the second blocking portion 100b and the housing 110b.

In this configuration, the first blocking portion 100a and the second blocking portion 100b adjacent to each other share the first blow coil 610, and the second blocking portion 100b and the third blocking portion 100c are The three blow coils 630 can be shared. Therefore, the first blow coil 610 serves to move the arc generated in the first cut-off part 100a to the arc extinguishing part 140 of the first cut-off part 100a, and at the same time, the second cut-off part 100b It may serve to move the arc generated in the arc extinguishing portion (140b) of the second blocking portion (100b). Similarly, the third blow coil 630 serves to move the arc generated in the second cut-off part 100b to the arc extinguishing part 140b of the second cut-off part 100b, and at the same time, the third cut-off part 100c It may serve to move the arc generated in the arc extinguishing portion (140c) of the third blocking portion (100c).

As described above, in the circuit breaker of the present embodiment, since a plurality of blocking units disposed adjacent to each other share the blow coil, it is possible to reduce the need for the blow coil, thereby minimizing manufacturing cost.

7 conceptually shows the configuration of a circuit breaker in which a plurality of blocking units are continuously installed. The circuit breaker of FIG. 7 includes a first cut-off part 100a, a second cut-off part 100b, a connection member 700, a first blow coil 610, a second blow coil 620, and a third blow coil 630. ).

The first blocking portion 100a and the second blocking portion 100b are arranged side by side in the first direction (X direction) to energize or block the DC circuit. The first blocking part 100a includes a first fixed contact part 120 and a first movable contact part 130, and the second blocking part 100b is a second fixed contact part 120b and a second movable contact part 130b. Includes.

The connecting member 700 electrically connects the first blocking portion 100a and the second blocking portion 100b. The connection member 700 may be implemented as a bus bar made of a conductive material. The connecting member 700 has one end connected to the first movable contact part 130 of the first cut-off part 100a and the other end connected to the first fixed contact part 120b of the second cut-off part 100b. The (100a) and the second blocking portion (100b) may be connected in series.

Power of the first polarity (+ power) is applied to the first fixed contact portion 120 of the first blocking portion 100a, and the power of the second polarity (-power) is the second operation of the second blocking portion 100b. It is applied to the contact portion 130b. Accordingly, the current flows from the fixed

contact portions

120 and 120b to the third direction (Z direction) in the direction of the

movable contact portions

130 and 130b in the first and second interrupting

portions

100a and 100b.

The first blow coil 610 is disposed between the first blocking portion 100a and the second blocking portion 100b. The second blow coil 620 is disposed to face the first blow coil 610 with the first blocking portion 100a therebetween. The third blow coil 630 is disposed to face the first blow coil 610 with the second blocking portion 100b therebetween.

Therefore, the first and second blow coils 610 and 620 generate a first magnetic flux between the first and second blow coils 610 and 620 to prevent the arc generated when the first cut-off part 100a is opened. ) Can be guided to the arc extinguishing unit 140 installed in. In addition, the first and third blow coils 610 and 630 generate a second magnetic flux between the first and third blow coils 610 and 630 to prevent the arc generated when the second blocking unit 100b is opened. ) Can be guided to the arc extinguishing part (140b) installed.

As shown in FIG. 7, the

first terminals

611, 621 and 631 to which the first to third blow coils 610, 620, and 630 are applied with the power (+ power) of the first polarity are the second terminals included in the second blocking portion 100b. The

second terminals

612, 622, 632, which may be connected to the fixed contact portion 120b, and to which the second polarity power (-power) is applied from the first to third blow coils 610,620,630, are included in the second blocking portion 100b. It may be connected to the second movable contact part 130b.

This is illustrated in a circuit concept as shown in FIG. 8. The breaker of this embodiment is driven by power supplied to the breaker without a separate power supply device for the first to third blow coils 610, 620, and 630. Therefore, it is possible to minimize the volume and manufacturing cost of the circuit breaker.

When power is supplied and the first and second cut-off

parts

100a and 100b are in the closed state, the first fixed contact part 120 and the first movable contact part 130 are connected, and the second fixed contact part 120b ) And the second movable contact part 130b are connected to each other, the first to third blow coils 610, 620, and 630 are in a zero-potential state, and power is not applied.

On the other hand, when the first cut-off part 100a and the second cut-off part 100b are open when power is supplied, the first movable contact part 130 is separated from the first fixed contact part 120 and the second movable Since the contact portion 130b is separated from the second fixed contact portion 120b, power is applied to the first to third blow coils 610, 620, and 630. Assuming that the first level voltage Vin is applied to the circuit breaker from the power supply side and the second level voltage V1 is applied to the first cut-off part 100a, the first to third blow coils 610,620,630 ) Is applied with a voltage V3 of a third level corresponding to a difference between the voltage Vin of the first level and the voltage V1 of the second level.

In the example of FIG. 7, (+) power is applied to the first fixed contact part 120 of the first cut-off part 100a and (-) power is applied to the second movable contact part 130b of the second cut-off part 100b. And, the first terminals 611,621,631 of the first to third blow coils 610,620,630 are connected to the second fixed contact part 120b of the second blocking part 100b, and the first to third blow coils 610,620,630 The

second terminals

612, 622, and 632 are connected to the second movable contact portion 130b of the second blocking portion 100b.

In this state, the surface of the second blow coil 620 that faces the first blow coil 610 operates as an N pole, and the opposite side operates as an S pole. In the first blow coil 610, a surface facing the second blow coil 620 operates as an S-pole, and a surface facing the third blow coil 630 operates as an N-pole. In the third blow coil 630, a surface facing the first blow coil 610 operates as an S-pole and the opposite side operates as an N-pole.

Therefore, the first and second blow coils 610 and 620 generate a first magnetic flux flowing in the first direction (X direction) between the first and second blow coils 610 and 620, and are generated when the first blocking portion 100a is opened. The arc is moved in the second direction (Y direction) above the first blocking portion 100a. The first and third blow coils 610 and 630 also generate a second magnetic flux in the first direction (X direction) between the first and third blow coils 610 and 630, and arc generated when the second cut-off part 100b is opened. Is moved in the second direction (Y direction) above the second blocking portion 100b.

When the polarity of the supplied power is changed, the circuit breaker according to the present embodiment can operate in the same manner as the above-described case because the polarity of the power applied to each of the blow coils 610, 620, and 630 is also changed. When the polarity of the power source is changed, the direction of the current and the direction of the magnetic flux formed by the blow coil are also changed, so that the arc generated in each blocking part (100a, 100b) is induced to the upper arc extinguishing part (140, 140b) as well. Can be. Therefore, it is possible to prevent a breakdown or accident due to an error in power connection when installing a circuit breaker.

7 and 8 illustrate only the case in which the two blocking

portions

100a and 100b are continuously installed, the number of blocking portions may be changed as necessary. In this case, only the number of cut-off parts and the number of blow coils are changed, and the connection pattern of the power supply and the installation method of the blow coil can maintain the shapes of FIGS. 7 and 8.

9 to 13 show a bouncing suppression device 500. The bouncing suppression device 500 suppresses bouncing of the movable contact part 130 when the movable contact part 130 is opened, so that the current can be quickly cut off. The bouncing of the movable contact part 130 refers to a phenomenon in which the movable contact part 130 rotates in an open direction at high speed and then rotates backward by repulsion in the process of stopping. If bouncing occurs when the movable contact unit 130 is opened, it may cause re-ignition of the arc, thereby delaying the blocking of the current.

The bouncing suppression device 500 may be installed on the front of the support frame 200 on both sides of the manipulator 400, respectively, as shown in FIG. 1, and the output shaft 300 is input when the movable contact part 130 is opened. By limiting the direction rotation, it is possible to suppress bouncing of the movable contact part 130.

9 and 10, the bouncing suppression device 500 includes a fixing plate 510, a first rotating member 520, a second rotating member 530, a support shaft 540, and a restoring spring 550 do.

The fixing plate 510 may be provided in a flat plate shape, and may be fixed to the front surface of the support frame 200. The fixing plate 510 may be elongated in a vertical direction perpendicular to the longitudinal direction of the output shaft 300, and a side surface on which the second rotating member 530 is installed may be maintained perpendicular to the center line of the output shaft 300.

The first rotating member 520 is fixed to the output shaft 300 to rotate together with the output shaft 300 and extends a predetermined length in the radial direction of the output shaft 300. The first rotating member 520 includes a locking protrusion 521 that is caught and restrained by the second rotating member 530 at a position spaced apart from the rotation center. The locking protrusion 521 may have its axis parallel to the axis of the output shaft 300. The first rotating member 520 may be firmly fixed to the output shaft 300 by a reinforcing member 522 coupled to a side surface. One side of the reinforcing member 522 may be welded to the first rotating member 520 and the other side may be welded to the outer surface of the output shaft 300.

The support shaft 540 is installed on the fixing plate 510 at a position spaced downward from the output shaft 300 and rotatably supports the second rotating member 530 from the lower side of the first rotating member 520. The axis of the support shaft 540 may be disposed parallel to the axis of the output shaft 300. As shown in FIG. 11, the separation distance L1 between the output shaft 300 and the support shaft 540 is set larger than the separation distance L2 between the output shaft 300 and the locking protrusion 521.

The second rotating member 530 may be provided in a flat plate shape. The second rotating member 530 is formed on the upper side spaced apart from the shaft coupling hole 532 formed on the upper edge side for coupling with the support shaft 540, the shaft coupling hole 532, and the first rotation member 520 The locking protrusion 521 is provided with a locking groove 531 through which the locking protrusion 521 enters and can be caught when rotating in the open direction.

As shown in FIG. 11, the locking groove 531 is opened toward the upper edge of the second rotating member 530, and the turning trajectory of the locking protrusion 521 in a state in which the second rotating member 530 is rotated to the initial position. An inlet 531a positioned in accordance with (T), a first engaging portion 531b that is provided on one side of the inlet 531a and hit by a locking protrusion 521 entering the inlet 531a, and the inlet 531a ) A second locking part (531c) provided on the other side and for restricting the reverse movement of the locking protrusion 521 by hooking the locking protrusion 521 when the second rotating member 530 rotates by the hit of the locking protrusion 521 Includes. The locking groove 531 may be formed to be long in the oblique direction so that the locking protrusion 521 can enter the inward through the inlet 531a.

Since the second rotating member 530 has a flat plate shape and the shape of the locking groove 531 is also simple, it can be easily manufactured by a method of pressing a steel plate. In addition, since the second rotating member 530 has a flat plate shape and can be installed adjacent to the surface of the fixing plate 510, it can contribute to reducing the volume of the bouncing suppressing device 500.

The restoring spring 550 imparts elasticity to rotate the second rotating member 530 to an initial position while being coupled to the support shaft 540. The restoration spring 550 rotates the second rotating member 530 to the state of FIG. 13 and then to the initial position of FIG. 11. When the second rotating member 530 rotates to the initial position, the inlet 531a of the locking groove 531 may be positioned to coincide with the turning trajectory T of the locking protrusion 521. Therefore, when the output shaft 300 rotates in the opening direction when the movable contact part 130 is opened, the locking protrusion 521 of the first rotating member 520 may enter the locking groove 531.

The restoration spring 550 may be provided as a torsion spring, and a spring support protrusion 512 for supporting one end of the restoration spring 550 may be provided on the fixing plate 510. As shown in FIG. 11, the second rotating member 530 is supported by the spring support protrusion 512 at the initial position, so that the inlet 531a of the locking groove 531 becomes the turning trajectory of the locking protrusion 521 It can keep the state consistent with (T).

In the present embodiment, the restoration spring 550 is employed for smooth restoration of the second rotating member 530, but the restoration spring 550 is not necessarily required for the operation of the second rotating member 530. Since the second rotating member 530 has a shape extending downward from the support shaft 540, even without the restoration spring 550, it can rotate by its own weight after the operation is completed and return to the initial position.

Next, the operation of the bouncing suppression device will be described with reference to FIGS. 11 to 13.

Referring to FIG. 11, since the output shaft 300 is rotated in the input direction in the input state of the movable contact part 130, the first rotating member 520 also maintains a state rotated in the input direction. Therefore, in this case, the locking protrusion 521 is completely separated from the locking groove 531 of the second rotating member 530.

In the state of FIG. 11, when the output shaft 300 rotates in the open direction to open the movable contact part 530, as shown in FIG. 12, the first rotating member 520 also rotates in the open direction, so that the locking protrusion 521 ) Enters the locking groove 531 of the second rotating member 530 and strikes the first locking portion 531b of the locking groove 531 to rotate the second rotating member 530.

Therefore, as shown in FIG. 13, the second rotating member 530 engages the locking protrusion 521 while the second locking portion 531c of the locking groove 531 rises to limit the reverse movement of the locking protrusion 521. do. When the locking protrusion 521 tries to move in the reverse direction due to bouncing of the movable contact part 130 at the end of the opening operation, the second locking part 531c of the second rotating member 530 engages the locking protrusion 521 By limiting the movement of the device 521 in the reverse direction, bouncing of the movable contact part 130 can be suppressed.

As described above, in the circuit breaker according to the present embodiment, when the movable contact unit 130 is opened, the bouncing suppression device 500 suppresses the bouncing of the movable contact unit 130, so that the current can be quickly cut off.

After completing the opening operation, the second rotating member 530 tries to rotate to the initial position again, and since the rim of the locking groove 531 is opened, the locking projection 521 is released. Therefore, the bouncing suppression device 500 according to the present embodiment does not prevent the output shaft 300 from rotating in the input direction, so that the input operation of the movable contact unit 130 can be smoothly performed.

Claims

A blocking portion having a fixed contact portion and a movable contact portion;

An output shaft that rotates in an input or open direction by an operation of a manipulator and transmits power for an input or open operation of the movable contact unit; And

Including; bouncing suppression device for suppressing bouncing when the movable contact portion is opened,

The bouncing suppression device,

A first rotating member fixed to the output shaft and provided with a locking protrusion at a position spaced from the rotation center in a radial direction; And

And a second rotating member having a locking groove into which the locking protrusion enters when the first rotating member is rotated in the open direction, and a second rotating member configured to engage the locking protrusion while rotating by hitting the locking protrusion to limit the reverse movement of the locking protrusion. Circuit breaker.
The method of claim 1,

The bouncing suppression device,

A fixing plate fixed to the outside of the blocking part; And

The circuit breaker further comprises a support shaft that is installed on the fixing plate in a state spaced apart from the output shaft, the shaft line is disposed parallel to the axis line of the output shaft, and rotatably supports the second rotating member.
The method of claim 2,

The bouncing inhibiting device further comprises a restoring spring for rotating the second rotating member to an initial position.
The method of claim 2,

A separation distance between the output shaft and the support shaft is greater than a separation distance between the output shaft and the locking protrusion,

The locking groove,

An inlet that is opened toward the edge of the second rotating member and positioned in accordance with the turning trajectory of the locking protrusion while the second rotating member is rotated to an initial position;

A first locking part provided at one side of the inlet and hit by the locking protrusion entering the inlet; And

A circuit breaker provided on the other side of the inlet and including a second locking part configured to engage the locking protrusion when the second rotating member rotates by the hit of the locking protrusion and restrict the reverse movement of the locking protrusion.
The method of claim 1,

The second rotating member is provided in a flat plate shape,

The locking groove is a circuit breaker having an inlet opened toward the edge of the second rotating member so that the locking protrusion enters and is caught.
The method of claim 1,

The second rotation member releases the restraint of the locking protrusion after the opening operation of the movable contact portion is completed, thereby allowing the output shaft to rotate in the input direction.
The method of claim 1,

The blocking portion includes a first blocking portion and a second blocking portion that are continuously arranged in a first direction,

The output shaft is elongated in the first direction and a circuit breaker that simultaneously transmits the power of the operation unit to the first and second cut-off units.
The method of claim 7,

A first blow coil disposed between the first blocking part and the second blocking part;

A second blow coil disposed to face the first blow coil with the first blocking portion therebetween; And

Further comprising a third blow coil disposed to face the first blow coil with the second blocking portion therebetween,

The first and second blow coils generate a first magnetic flux between the first and second blow coils to move the arc generated when the first cut-off part is opened in a second direction above the first cut-off part,

The first and third blow coils generate a second magnetic flux between the first and third blow coils to move the arc generated when the second cut-off part is opened in a second direction above the second cut-off part .
The method of claim 8,

A circuit breaker further comprising a connecting member connecting the movable contact part of the first cut-off part and the fixed contact part of the second cut-off part to connect the first cut-off part and the second cut-off part in series.
The method of claim 9,

Power of a first polarity is applied to the fixed contact portion of the first blocking portion, and a power of a second polarity opposite to the first polarity is applied to the movable contact portion of the second blocking portion,

The first terminals to which the power of the first polarity is applied from the first to third blow coils are connected to the fixed contact portion of the second blocking unit, and the second polarity power is applied from the first to third blow coils. The two terminals are circuit breakers connected to the movable contact portion of the second blocking portion.
The method of claim 9,

Current flows from the fixed contact portion to a third direction, which is a direction of the movable contact portion,

The first magnetic flux is formed in the first direction from the second blow coil to the first blow coil direction, and the second magnetic flux is formed in the first direction from the second blow coil to the third blow coil. ,

The arc generated in the first and second cut-off portions is moved in the second direction perpendicular to the first and third directions according to Fleming's left hand rule.
The method of claim 8,

When a voltage of a first level is applied to the first and second cut-offs from a power supply, if the first and second cut-offs are open, the first to third blow coils have a voltage of the first level and the first level. A circuit breaker to which a voltage of a third level corresponding to a voltage difference between voltages of the second level applied to the first cut-off portion is applied.
The method of claim 8,

A circuit breaker in which the first to third blow coils are maintained in a zero potential state when the first and second cut-off parts are in a closed state when a voltage of a first level is applied to the first and second cut-off parts from a power supply.
The method of claim 8,

The first blocking portion and the second blocking portion each include a housing and an arc extinguishing portion disposed above the housing to extinguish an arc,

The first blow coil is accommodated in grooves respectively formed in the housing side of the first blocking portion and the housing side of the second blocking portion facing each other,

The second blow coil is partially accommodated in a groove formed on the other side of the housing of the first blocking portion,

The third blow coil is partially accommodated in a groove formed on the other side of the housing of the second blocking portion.
An output shaft that rotates in the input or open direction by the operation of the manipulator and transmits power for the closing or opening operation of the blocking unit; And

Includes; a bouncing suppression device for suppressing bouncing when the blocking portion is opened,

The bouncing suppression device,

A first rotating member fixed to the output shaft and provided with a locking protrusion at a position spaced from the rotation center in a radial direction; And

And a second rotating member having a locking groove into which the locking protrusion enters when the first rotating member is rotated in the open direction, and a second rotating member configured to engage the locking protrusion while rotating by hitting the locking protrusion to limit the reverse movement of the locking protrusion. Circuit breaker.
The method of claim 15,

The second rotating member is provided in a flat plate shape,

A separation distance between the output shaft and the rotation center of the second rotation member is larger than a separation distance between the output shaft and the locking protrusion,

The locking groove,

An inlet that is opened toward the edge of the second rotating member and positioned in accordance with the turning trajectory of the locking protrusion while the second rotating member is rotated to an initial position;

A first locking part provided at one side of the inlet and hit by the locking protrusion entering the inlet; And

A circuit breaker provided on the other side of the inlet and including a second locking part configured to engage the locking protrusion when the second rotating member rotates by the hit of the locking protrusion and restrict the reverse movement of the locking protrusion.