KR100728863B1 - Arc extinguishing device of air circuit breaker - Google Patents

Abstract

An arc extinguishing device of an air circuit breaker is provided to prevent the gas from inputting to an opposite direction of a pressure outlet by installing a puffer device at a lower end of a guide arm. An arc extinguishing device of an air circuit breaker includes a movable contactor(14), a fixing contactor(16), a puffer device(100), a guide arm(17), and a slot. When the movable contactor(14) is isolated from the fixing contactor(16), the puffer device(100) partitions an arc extinguishing unit and an instrument unit by shielding an interval between the movable contactor(14) and the fixing contactor(16). The puffer device(100) is installed at a lower end of the guide arm(17). The guide arm(17) is mounted on the slot(100) which is formed at an upper part of the puffer device(100). An installation unit which is installed on the slot of the puffer device(100) is formed at a lower end which connects the puffer device(100) to the guide arm(17). A pin hole into which a fixing pin is inserted, is formed on the puffer device(100).

Description

Arc extinguishing device for lift circuit breaker {ARC EXTINGUISHING DEVICE OF AIR CIRCUIT BREAKER}

1 is a view showing a state of a circuit breaker at the time of energizing a conventional rated current.

2 is a view showing a state of a circuit breaker when a conventional abnormal current occurs.

Figure 3 is a view showing a state of the circuit breaker at the time of energizing the rated current according to the present invention.

4 is a view showing a state of a circuit breaker when an abnormal current is generated according to the present invention.

5 is a view for showing a preferred protruding length of the back exhaust prevention wall according to the present invention.

6A is a perspective view showing a state before assembly of a guide arm and a puff device;

6B is a perspective view showing a state after assembly of the guide arm and the puff device;

6C is a front view of FIG. 6B.

Figure 7 is a three-dimensional view showing a cut-off state of a circuit short circuit in which a puff device is installed in accordance with a preferred embodiment of the present invention.

8 is a cross-sectional view for illustrating another embodiment of the puff device according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10; Isolation arm 13; Mover

14; Operation contactor 16; Fixed contactor

17; Guide arm 25; Pressure spring

100; Puff device 110; Push pin

105; Slot 120: puff body

130: back exhaust prevention wall

The present invention relates to a fire protection device for an air circuit breaker, and more particularly, a high-temperature, high-pressure pressure gas generated by an arc generated by the open contact of a movable contactor and a fixed contactor when an abnormal current flows in a direction opposite to the pressure discharge port. The present invention relates to a circuit breaker extinguishing device capable of quickly breaking a circuit breaker by blocking it.

The air circuit breaker is a power device that protects the circuit and the load by automatically cutting off the circuit in the event of an electrical overload or short-circuit, and is a mechanical part and a fixed contactor which mutually contacts or opens the movable contactor and the fixed contactor in the breaker. And an arc extinguishing device that suppresses and arcs the arc generated when the contactor is opened and detects when an abnormal current such as overcurrent, instantaneous current, short circuit current occurs on the power supply side, and trips to induce a trip operation signal to cut off the power supply of the switching mechanism. It is made of wealth.

On the other hand, when an abnormal current such as overcurrent, instantaneous current, short circuit current, etc. occurs, it is recognized in the circuit breaker regardless of artificial opening and closing and automatically cuts off the current. This is commonly called trip.

When a short circuit current higher than the instantaneous current occurs in the circuit, the tripping part of the breaker detects this and sends a trip signal to the mechanical part.Arc is generated between the movable contact and the fixed contact by discontinuous current interruption. High temperature and high pressure gas is generated by electric arc phenomenon.

Hereinafter, a conventional air circuit breaker will be described with reference to FIGS. 1 and 2.

1 is a view showing a state of a circuit breaker when a conventional rated current is energized, Figure 2 is a view showing a state of a circuit breaker when a conventional abnormal current occurs.

As shown in Fig. 1 and Fig. 2, there is provided a arcuate portion and a movable portion in the space in the upper mold case 1 and the lower mold case 3, specifically, the insulation arm for transmitting a force from the mechanism of the mechanism portion to the movable portion (10), the movable arm (13) connected to the insulating arm (10) by the pivot pin (11), the guide arm (17) which rotates around the rotary pin (18), and is compressed and charged with the input force transmitted from the mechanism part. The contact spring 25 for storing energy, the upper arc runner 31 and the lower arc runner 33 for guiding the arc generated in the opening of the fixed contact 16 and the movable contact 14 to the arc chute 30. And the like.

The mover 13 is connected to a load side terminal 23 and a flexible shunt 21, and the movable contact 14 contacts the stationary contact 16 on top of the input side terminal 19 to contact the input side terminal 19. ), Current flows through the load terminal (23).

At this time, when a short circuit current flows into the air circuit breaker in the energized state where the movable contact 14 and the fixed contact 16 are in contact with each other, as shown in FIG. 1, the trip unit detects the fault current and sends a trip signal to the mechanism. The trip latch (not shown) is then released.

When the trip latch of the mechanism part is released, as shown in FIG. 2, the compression energy of the contact spring 25 charged by the input force of the mechanism part induces a rotational force to the mover 13, thereby causing the mover 13 to move. It rotates clockwise about the rotation pin 18, and simultaneously the movable contact 14 and the fixed contact 16 start to open.

At this time, the insulating arm 10 connected to the mover 13 and the pivot pin 11 also moves up and down while rotating clockwise, and the movable contact 14 is opened from the fixed contact 16 by a predetermined height. The tripping operation of the mover 13 is completed.

On the other hand, the arc generated while the fixed contactor 16 and the movable contactor 14 are opened is an arc-shaped upper arc runner 31 around the contact position of the fixed contactor 16 and the movable contactor 14 according to the arc extinguishing structure. The lower arc runner (33) and continues to move toward the arc chute 30, the high temperature, high pressure gas generated by the arc phenomenon is filled into the mold case and exits to the gas outlet.

However, the conventional circuit breaker configured as described above has the following problems.

That is, after detecting the short circuit, the arc of the movable contact is opened from the fixed contact by the trip signal of the trip part.At this time, the high temperature and high pressure gas flows into the lower part of the operator and fills the inside of the mold case, and then discharges. Since the high temperature and high pressure gas cannot be discharged efficiently through the gas outlet, and the arc cannot be extended, the high temperature and high pressure gas introduced in the opposite direction of the gas outlet is not achieved. Problems occur in the breaking operation by damaging the contact spring or the mechanism that is the power source of the breaking operation.

In addition, the blocking time is delayed and the breaking energy is increased, thereby causing physical damage to the main body, the mover, and the stator of the breaker.

Therefore, the present invention has been made to solve the above problems, an object of the present invention, by installing a puff device on the lower end of the guide arm, the movable contactor and the fixed contact occurs when the movable contact and the fixed contact by the trip signal after detecting the short circuit accident It is to provide a vacuum circuit breaker that prevents the high-temperature, high-pressure gas from flowing into the opposite side of the gas outlet, that is, the mechanism portion and can be discharged mainly toward the gas outlet.

The circuit breaker extinguishing device according to the present invention for achieving the above object has an extinguishing portion for suppressing and extinguishing arcs generated when the fixed contactor and the movable contactor are opened, and an insulating arm and a pivot pin for transmitting power to the trip mechanism part. An air circuit breaker having a trip part including a mover and a guide arm coupled to each other, the puff device for partitioning the arc extinguishing part and the mechanism part by shielding a gap formed when the movable contact part and the fixed contact part are opened. It is mounted on the lower end of the guide arm, the upper portion of the puff device is formed with a slot for mounting the guide arm, the lower end of the guide arm is coupled to the puff device is formed in the mounting portion is mounted in the slot of the puff device The puff device has a fixed pin inserted from the front to the rear. And hold the ball pin is formed to be, and is characterized in that the ball pin, which passes through the fixing pin is formed in the mounting portion of the guide arm.
Preferably, the puff device is located at a lower end of the movable arm with respect to the arcuate portion at the lower end of the guide arm facing the stationary contact side, and the shape of the puff device is a body portion having a predetermined shape for mounting on the guide arm, and the body. It may be composed of a reverse exhaust prevention wall protruding in a downward direction from the portion, the body portion and the reverse exhaust prevention wall may be configured integrally or detachably coupled.

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In addition, the material constituting the puff device may be a gassing material, which is a material for extinguishing arcs, which generates arcs to assist arc extinguishing.

In addition, the protruding length L2 of the reverse exhaust prevention wall is the shortest distance from the guide arm to the fixed contact to prevent the deterioration of the breakdown voltage performance which may occur by completely shielding the gap between the fixed contact and the movable contact when opening. It protrudes shorter than L1, so that an open space of a predetermined interval is formed during opening.

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

3 is a view showing a state of the circuit breaker when the rated current is energized according to the present invention, Figure 4 is a view showing a state of the circuit breaker when the abnormal current according to the present invention.

3 and 4, the puff device 100 and the puff device provided in the lower side of the guide arm 17 to which the mover 13 is coupled are significantly different from those of the conventional drawings of FIGS. 1 and 2. The lower mold case 3 has a recessed shape corresponding to the formation of 100.

The recessed portion of the lower mold case 3 is recessed by a predetermined rotational area so as not to be rotated by the puff device 100, and has a shape corresponding to an implementation shape or size of the puff device 100, and the puff. The device 100 may be integrally formed at the lower end of the guide arm 17 as shown in the cross-sectional shape of FIG. 3 or 4, but may have a separate coupling structure coupled to the guide arm 17 as shown in FIGS. 6A to 6C. Can also be formed.

The puff device 100 should be positioned after the movable contact 14 at the bottom of the guide arm 17 opposite the stationary contact 16, which is an arc in which the puff device 100 is obsolete than the movable contact 14. If it is closer to the chute 30 or the arc runner 31, 33, the opposite action of the intention of the present invention, it is the rear end than the movable contact 14, but the contact spring 25 of the rear end as much as possible It may be desirable to place it closer to the movable contact 14 so as not to be placed close to components such as a).

When the configuration of the puff device 100 is composed of an integrated body, the subdivision can be divided into two parts. As shown in an enlarged view in FIG. 4, the first configuration forms the body of the puff device 100. It is fixed to the lower side is made of a body portion 120 constituting the entire body of the puff device, and a reverse length prevention wall 130 that is formed to protrude a predetermined length in the downward direction of the body portion 120 serves to substantially prevent back exhaust. .

The material constituting the puff device 100 may be a gassing material which is a material for generating arcs to help arc extinguishing when an arc is generated. Examples of specific material for extinguishing the material include nylon 6 (Nylon-6), Teflon, MC-nylon, Poly Oxy Methelene (POM) and the like are used.

When the puff device is made of such SOHO material, the puff device of SOHO material is heated instantly by an arc of instantaneous temperature of about 10000 ° C, which emits carbon gas in case of nylon 6 (Nylon-6) and hydrogen gas in case of POM. As a result, arc action is induced.

On the other hand, the protruding formation length L2 of the reverse exhaust prevention wall 130 is formed to open a predetermined space so as not to completely shield the gap between the fixed contact 16 and the movable contact 14 when opening. When the end of the reverse exhaust prevention wall 130 is A, the closest point on the fixed contact 16 side when viewed from the movable contact 14 side is B, the protruding length L2 of the reverse exhaust prevention wall 130 is Means the length from guide arm 17 to A and L1 represents the shortest distance from the guide arm 17 to the fixed contact, the distance from guide arm 17 to B, and the reference of L1 and L2 is Although the guide arm 17 is used, if the puff device according to the present invention is fixed to the lower side of the mover, the lower side of the mover may be a reference. In view of the above distance definition, the protruding length L2 of the anti-back exhaust prevention wall 130 should be shorter than L1, and the gap difference LL caused by the length difference exists to be open to a certain space.

The reason for preventing the complete shielding by the puff device 100 is that when the full-voltage test to measure the ability to withstand the high voltage by applying a high voltage between the circuit of the air circuit breaker and the ground may be a decrease in the withstand voltage performance Because.

Hereinafter, a puff device and a guide arm having a separate coupling form, which is another embodiment according to the present invention, will be described in detail with reference to FIGS. 6A, 6B, and 6C.

FIG. 6A is a perspective view showing a pre-assembly state of the guide arm and the puff device, FIG. 6B is a perspective view showing a post-assembly state of the guide arm and the puff device, and FIG. 6C is a front view of FIG. 6B.

As shown in these figures, the puff device 100 has a rectangular shape with a slot 105 formed thereon, and the left wall 103 of the puff device 100 in contact with the sidewall of the mover 13 is It extends downwardly long.

At this time, the slot 105 formed on the upper portion of the puff device 100 is a guide arm 17 mounting slot 105 on which the mounting portion 17c of the guide arm, which will be described below, is mounted. The number of slots 105 is formed. Of course, the slot 105 may be a '105' shaped slot 105 extending on the upper surface and the side, depending on the shape of the mounting portion 17c of the guide arm 17, or may be formed only on the upper surface, The scope of the present invention is not limited by the shape of the slot 105 of the puff device 100 as long as the mounting portion 17c of the guide arm 17 can be mounted.

On the other hand, the front of the puff device 100 is formed with a pin hole 17d, which is more rigidly mounted after the guide arm 17 is mounted in the slot 105, the guide arm 17 in the slot 105 It is formed to insert the fixing pin 110 to be, it is formed at least the length of the fixing pin 110 toward the rear portion from the front of the puff device 100. At least two pin holes 17d may be formed, but at least two pin holes 17d may be formed to firmly couple the guide arm 17 and the puff device 100 to couple them with two or more fixing pins 110. desirable.

The left wall 103 of the puff device 100 is formed with a predetermined inclination to slide up and down on the side wall of the mover 13, and the left wall 103 is movable contact 14 from the fixed contact 16. ) Is extended to the extent that it can block the gap formed during opening.

This is because the high temperature and high pressure gas generated at the opening of the fixed contact 16 and the movable contact 14 is prevented from being dispersed and introduced in the direction opposite to the gas outlet by the left wall 103 of the puff device 100. This is because the gap formed by the opening of the 16 and the movable contact 14 must be sufficiently blocked.

Meanwhile, referring to the guide arm 17 mounted in the slot 105 of the puff device 100, two large pin insertion holes 17a and 17b are formed at the left and right sides of the guide arm 17. A pivot pin 11 for coupling the mover and the guide arm 17 to each other is inserted into the pin insertion hole 17a on the left side, and a rotation center of the mover 13 is inserted into the pin insertion hole 17b on the right side. Rotation pin 18 is inserted to achieve.

In addition, at the lower left of the guide arm 17, a mounting portion 17c is formed on which the guide arm 17 is mounted in the slot 105 of the puff device 100. The mounting portion 17c has a guide arm 17 and A pin ball 17d through which the fixing pin 110 penetrates the mounting of the puff device 100 is formed.

Hereinafter will be described the operation of the puff device 100 of the present invention having the configuration and function as described above.

As shown in FIG. 3, when the current is energized, the fixed contactor 16 and the movable contactor 14 make contact with each other, and the current input through the input side terminal 19 is connected to the fixed contactor 16 and the movable contactor 14. Flows through the mover 13 and the flexible shunt 21 and then to the load-side terminal 23.

However, when an abnormal current, such as a short circuit current, flows in the energized state, the trip unit detects this and induces a trip signal to be sent to the mechanism, so that the movable contact 14 is opened from the fixed contact 16 as shown in FIG.

That is, when an abnormal current flows in the energized state, the contact spring 25 which is compressed by the input force of the mechanism part and stores the charging energy is elongated, causing the rotating force of the stator 13 to rise, The guide arm 17, which is rotated in the clockwise direction and coupled to the mover 13 and the pivot pin 11, also rotates in the clockwise direction while being raised about the rotation pin 18. FIG. When the movable element 13 and the guide arm 17 are rotated in this manner, the movable contact 14 begins to open from the fixed contact 16, and a gap is generated between them.

At this time, as shown in FIG. 4, the puff device 100, which is mounted at the bottom of the guide arm 17 and slides down along the sidewall of the mover 13, is fixed while rising along the sidewall of the mover 13. The gap formed between the contactor 16 and the movable contactor 14 is blocked to separate the compartment into the arc extinguishing unit and the movable unit.

And, as the movable contact 14 is opened from the fixed contact 16, the arc is generated, the high temperature and high pressure gas is generated by the arc generation, the generated gas is the opposite direction of the gas outlet by the puff device 100 That is, it is blocked from flowing in and out to the contact spring 25 side and flows only in the direction of the gas outlet.

Therefore, the present invention, unlike the prior art by mounting the puff device 100 at the bottom of the guide arm 17, the high-temperature, high-pressure gas generated when the movable contact 14 is opened from the fixed contact 16 in the opposite direction to the gas outlet It can block the flow and flow only in the direction of the gas outlet to extend the arc, thereby inducing an arc voltage rise, so that a quick shut-off is made in the event of an abnormal current, the gas of high temperature and high pressure is dispersed to the contact spring (25) side Since it does not flow in, it is possible to prevent damage to the contact spring 25 or the mechanism part.

As described above, the present invention, unlike the prior art, by mounting the puff device 100 to the lower end of the guide arm 17, the high-temperature, high-pressure gas generated when opening the fixed contact 16 and the movable contact 14 is opposed to the gas outlet Can be prevented from flowing in the direction, and the gas can be discharged efficiently, and the arc voltage is helped to increase the arc voltage, so that when the abnormal current is generated, it is quickly shut off, and the mechanism part opposite to the gas outlet is protected from the high temperature and high pressure gas. You can do it.

Hereinafter, the operation of the puff device will be described again with reference to FIG. 7 to more easily understand the operation of the air circuit breaker in which the puff device according to the exemplary embodiment of the present invention is installed.

Figure 7 is a three-dimensional view showing the cut-off state of the air circuit breaker is installed puff device according to an embodiment of the present invention.

When the short circuit or the fault current occurs, the fault current is sensed by the trip part, and a trip release signal is sent to the mechanism part. At the same time, the contact spring that was compressed while the trip latch of the mechanism that applied the input force to the insulation arm 10 was released (25). ), The mover 13, the guide arm 17, and the puff device 100 start clockwise rotational movement about the rotation pin 18 at the same time.

At this time, the movable contact 14 starts to open from the fixed contact 16 and a blocking operation is performed. When the movable contact 14 starts to open from the fixed contact 16, an arc occurs between the two contacts, and the generated arc is the upper arc runner 31, the arc chute 30 and the lower arc runner ( 33, the gas is connected to the mover 13 and gradually extinguishes, and the high pressure gas generated by the arc is connected to the pressure spring 25 by the puff device 100 mounted at the bottom of the mover 13 and the guide arm 17. The inflow to the opposite side of the gas outlet located is blocked to fill only the left side of the puff device 100 inside the upper mold case 1 and the lower mold case 3, and exits to the gas outlet.

In the above described the best embodiment according to the present invention, Figure 8 shows another embodiment of the puff device for preventing back exhaust in accordance with the present invention.

The puff device of FIG. 8 has a concave shape in which the back exhaust prevention wall 131 is concave toward the direction in which the back exhaust pressure is pushed. This is supported by the back exhaust pressure evenly to support the force to be discharged to prevent back exhaust. It is a form for further improving the induction function, wherein the secondary back exhaust prevention wall 34 of the mold case side denoted by reference numeral 34 is a high-temperature, high-pressure arc which is partially introduced to the rear end side through the puff device according to the present invention. Can be configured with the intention of blocking the secondary so that it is no longer applied to the component side such as a contact spring, wherein the recessed space of the mold case in consideration of the puff device is a blocking space for the secondary blocking of the back exhaust It can be used as.

In the above, the best embodiment has been disclosed in the drawings and the specification. Although specific terms have been used herein for the purpose of description, they are used only for the purpose of describing the present invention and are not intended to limit the meaning or the scope of the invention as set forth in the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention should be defined by the technical spirit of the appended claims.

According to the present invention, by providing a puff device at the lower end of the guide arm, it is possible to prevent the high temperature and high pressure gas generated during opening of the fixed contactor and the movable contactor to be dispersed and introduced in the opposite direction to the gas outlet, thereby enabling efficient gas discharge. Also, the arc voltage can be increased by the high temperature and high pressure gas to increase the arc voltage, so that the breaker can be cut off in the event of abnormal current, and the contact spring or the mechanism in the opposite direction of the gas outlet can be prevented from being damaged by the high temperature and high pressure gas. can do.

Claims (8)

Lifting circuit provided with a tripping part for suppressing and extinguishing arcs generated when opening the fixed contactor and the movable contactor, and a tripping part including an insulated arm transmitting power to the trip mechanism part and a movable arm and a guide arm coupled by a pivot pin. In circuit breaker, A puff device is provided at a lower end of the guide arm to shield the gap formed when opening the movable contactor and the fixed contactor to partition the arc extinguishing section and the mechanism section. The upper portion of the puff device is formed with a slot for mounting the guide arm, the lower end of the guide arm is coupled to the puff device is formed with a mounting portion mounted to the slot of the puff device, The puff device has a pin ball to which the fixing pin is inserted from the front to the rear is formed long, and a pin ball through which the fixing pin is formed in the mounting portion of the guide arm. The method of claim 1, And said puff device is positioned at a rear end of said movable contact with respect to said arc extinguishing means at the lower end of said guide arm opposite to said stationary contact side. The method of claim 1, The puff device has a body portion of a predetermined shape to be mounted to the guide arm; and the exhaust circuit breaker of the circuit breaker, characterized in that consisting of; a reverse exhaust prevention wall protruding in a downward direction from the body portion. The method of claim 3, wherein The protruding length (L2) of the anti-back exhaust prevention wall is projected shorter than the shortest distance (L1) from the guide arm to the fixed contact is formed. delete delete The method according to any one of claims 1 to 4, The material constituting the puff device is arc extinguishing device of the circuit breaker, characterized in that the gas generated when the arc is generated at a high temperature. The method of claim 7, wherein Said gassing material is nylon 6 (Nylon-6), Teflon (Teflon), MC-nylon, POM (Poly Oxy Methelene) arc protection device of the circuit breaker, characterized in that at least one of which is used.

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