KR100881363B1 - Air circuit breaker with main shaft apparatus capable of reducing torque of closing spring against contact spring when it turns on - Google Patents

Abstract

The present invention is to provide an air circuit breaker having an opening and closing axis (main shaft) that can reduce the load of the input spring during the closing operation in the air circuit breaker, the air circuit breaker according to the present invention is R, S, T phase and neutral phase N A fixed contact provided to correspond to the circuit on the top; The R, S, T phase and the neutral phase are movable to a closing position for electrically disconnecting the circuit by being separated from the fixed contactor by being in contact with the fixed contactor to electrically energize the circuit to which the air circuit breaker is connected. A plurality of movable contacts of R, S, T phase and neutral commercially provided to face the fixed contacts; A contact spring connected to said movable contactor for applying an elastic force to said movable contactor to increase the contact pressure of said fixed contactor and said movable contactor; And

At least one of the movable contactors except the phase connected to the movable contactor of the neutral commercially available and the remaining three phases among the movable contactors to reduce the closing drive torque imposed on the contact spring when driving the movable contactor to the closing position. It includes an opening and closing shaft for supporting a commercial movable contact protrudes toward the fixed contact than other movable contact.

Air circuit breaker, open / close shaft (reduced spindle), closing spring load reduction, movable lever

Description

AIR CIRCUIT BREAKER WITH MAIN SHAFT APPARATUS CAPABLE OF REDUCING TORQUE OF CLOSING SPRING AGAINST CONTACT SPRING WHEN IT TURNS ON}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air circuit breaker, and more particularly, to an air circuit breaker having an opening and closing shaft device capable of increasing the life of the opening and closing mechanism according to the reduction of the input load, which can be transmitted by reducing the torque of the input spring during the closing operation. will be.

The air circuit breaker is a relatively low voltage circuit breaker that can be opened and closed in the air without any special arc medium such as special arc extinguishing gas, and is inputted by using the discharging elastic energy of the closing spring of the switching mechanism during the opening and closing operation. Energization operation) and performs a trip, that is, a circuit breaking operation by using elastic energy of the contact spring and the open spring.

On the other hand, an example of the air circuit breaker according to the prior art will be described with reference to the accompanying drawings.

1 is a perspective view showing the overall internal structure of the air circuit breaker, such as the opening and closing shaft and the moving part lever, the opening and closing mechanism and the phase insulation in the air circuit breaker according to the prior art, will be described with reference to FIG.

In general, a three-phase air circuit breaker with R, S, and T phases is used in a three-phase circuit (line), and a four-phase with R, S, T, and N phases is used in a three-phase four-wire circuit (line) with a neutral wire. Air circuit breakers are used. The phase here represents each phase of the alternating current and is also called a pole.

In the air circuit breaker according to the prior art, the opening and closing mechanism 6 providing the opening and closing driving force is installed on the front side of the air circuit breaker, and the rear of the opening and closing mechanism 6 is rotatably received by the driving force from the opening and closing mechanism 6 R. The opening and closing shaft or so-called main shaft (hereinafter referred to as opening and closing shaft) 4 composed of a metal rod as the opening and closing driving shaft common to the S, T, and N phases is defined by the first and second shaft support brackets 5a and 5b. It is installed to be supported.

On the opening / closing shaft 4, a moving part lever for power transmission for driving a phase movable contactor (not shown) is provided, and FIG. 1 shows R phase and S phase moving part levers 7a and 7b among the four moving part levers. have.

First to fifth insulating partition wall mold members 3a-3e are provided at the rear of the opening / closing shaft 4, and one integrated rear insulating mold is located at the rear of the first to fifth insulating partition wall mold members 3a-3e. The mold member 2 is connected to the first to fifth insulating partition wall mold members 3a-3e and is commonly provided to close the rear.

Between the first and second insulating wall mold members 3a and 3b adjacent to each other among the first to fifth insulating partition wall mold members 3a-3e, the second and third insulating wall mold members 3b and 3c. ), Between the third and fourth insulating wall mold members 3c and 3d and between the fourth and fifth insulating wall mold members 3d and 3e, a movable contact not shown is rotatably provided, respectively. A fixed contactor (not shown) is fixedly installed on the wall surface of the rear insulating mold member 2 facing the movable contactors.

On the other hand, Fig. 3 showing the installation relationship of the opening and closing shaft and the respective movable portion levers in the air circuit breaker according to the prior art as a perspective view, and the installation relationship of the opening and closing shaft and the movable portion levers in the air circuit breaker according to the prior art side view Referring to Figure 4 showing the stand as follows.

The opening and closing driving force from the opening and closing mechanism (refer to FIG. 1) is transmitted to the opening and closing shaft 4 to rotate the opening and closing shaft 4, and the rotation of the opening and closing shaft 4 is performed on the R, S, T, N phase moving part lever 7a. Through -7d) to the individual contactor side. 3 and 4, each of the R, S, T, and N phase movable part levers 7a-7d are welded and fixed at the same angle on the opening and closing shaft 4, respectively. In addition, although not shown, in the case of a four-phase air circuit breaker used in a three-phase four-wire circuit, a neutral pole, that is, an N-phase movable contact, is put in place of other phases, that is, an R, S, T-phase movable contact for the purpose of improving electrical safety. When the N-phase moving part lever is rotated more toward the fixed contactor than the R, S, and T moving part levers so as to be blocked late at the time of a trip, the moving part levers in the R, S, and T phases are as shown in FIG. Can be welded to the opening and closing shaft in a more clockwise direction.

Figure 2 is a plan view showing the relative position of the opening and closing mechanism, the opening and closing shaft, the phase moving part lever, the phase movable contactor and the fixed contact in the air circuit breaker according to the prior art. When the movable part levers 7a-7d of R, S, T and N phases are welded and fixed at the same angle on the opening / closing shaft 4, the R, S, T, N phases as viewed from above as shown in FIG. The end faces of the movable contacts 8a-8d facing the R, S, T, and N phase fixed contacts 9a-9d are aligned in line with the virtual reference line A. FIG. In Fig. 2, reference numeral 8 denotes a generic name of the R, S, T, N phase movable contacts 8a-8d.

On the other hand, the opening and closing operation of the air circuit breaker according to the prior art will be described with reference to Figs. The opening and closing operation of the air circuit breaker according to the present invention may also refer to the operations of FIGS. 5 to 7 as in the prior art, except for the operation of the structural features of the present invention.

First, the process of operating in the shut-off state as shown in FIG. 7 in the closing state as shown in FIG. 6 will be briefly described as follows.

When the opening / closing shaft 4 is rotated counterclockwise through the link mechanism by discharging an open spring shown in FIG. 6 included in the opening / closing mechanism 6 in the closing state as shown in FIG. 6, R, S, T and The N phase moving part levers 7a-7d rotate together counterclockwise (a state where only the R phase moving part lever 7a is seen in FIG. 6). Accordingly, the connecting link 10 whose one end is connected to the movable part levers 7a-7d on R, S, T and N retreats from the state of FIG. 6 to the right as shown in FIG. 5, and thus the connecting link 10 The movable contactor (the R-phase movable contact 8a in FIGS. 6 and 7) connected to the other end of the e.g.) is separated from the fixed contactor (the R-phase fixed contactor 9a in FIGS. 6 and 7) and the air circuit breaker is connected. Circuit is opened (blocked).

Next, a process of operating in the closing state as shown in FIG. 6 through the charging process of the closing spring as shown in FIG. 5 in the blocking state as shown in FIG. 7 will be described below.

In the cut-off state shown in FIG. 7, the non-signed input spring provided in the lower part of the opening / closing mechanism 6 is a state in which the elastic energy is precipitated and compressed as shown in FIG. 5. . By pressing the closing button of the small spring of the closing spring, the spring-loaded motor operates, the cam connected to the motor output shaft rotates, and the spring seat supporting one end of the spring by the cam moves in the compression direction. In this case, the closing spring may be compressed, and the driving force may be selectively performed by operating the manual driving handle in addition to the driving method.

As shown in FIG. 5, in a state in which the closing spring and the closing spring are enclosed, when the user presses the closing button (not shown) provided on the front operation panel (called a main cover) of the air circuit breaker (not shown), the opening / closing mechanism 6 The unscheduled closing latch of the designator rotates to the release position, and the restraint state constraint of the closing spring is released, and the closing spring releases the elastic energy and the opening / closing shaft through the link mechanism of the opening / closing mechanism 6 by the released elastic energy. (4) rotates clockwise. Accordingly, the connecting link 10 whose one end is connected to the movable part levers 7a-7d on R, S, T and N is advanced from the state of FIG. 5 to the left as shown in FIG. 6, and thus the connecting link 10 The circuit connected to the air circuit breaker by contacting the movable contactor (the R-phase movable contact 8a in FIG. 5) with the fixed contactor (the R-phase fixed contactor 9a in FIG. 5) connected to the other end thereof. Energized state).

The air circuit breaker according to the related art, which is constructed and operated as described above, is applied to a circuit having a relatively low voltage, and has a performance capable of energizing for a short time with high fault current and a temperature rise meeting a standard condition. Therefore, in order to satisfy the standards of short-time fault current carrying performance and temperature rise, the pressure on the contact surface is increased in the input state, that is, the movable contactor is in contact with the fixed contactor. Most of this pressure increase is achieved by increasing the elastic force of the contact springs placed behind the movable contactor. However, the increase in the elastic force of the contact spring increases the load of the input spring during the closing operation of the air circuit breaker, that is, the use of the input spring with high elastic force, and the increase of the elastic force of the input spring shortens the life of the opening and closing mechanism that must withstand such elastic force. There is a problem.

Therefore, the present invention is to solve the problems of the prior art, an object of the present invention can reduce the load (torque) of the corresponding closing spring by reducing the load (torque) transmitted to the opening and closing mechanism by the contact spring and open and close It is to provide an air circuit breaker having an opening and closing shaft device for transmitting the opening and closing drive force that can extend the life of the mechanism.

An object of the present invention, the air circuit breaker,

Fixed contacts provided corresponding to the circuits of R phase, S phase, T phase and N phase which are neutral phases;

The R, S, T phase and the neutral phase are movable to a closing position for electrically disconnecting the circuit by being separated from the fixed contactor by being in contact with the fixed contactor to electrically energize the circuit to which the air circuit breaker is connected. A plurality of movable contacts of R, S, T phase and neutral commercially provided to face the fixed contacts;

A contact spring connected to said movable contactor for applying an elastic force to said movable contactor to increase the contact pressure of said fixed contactor and said movable contactor;

An input spring for providing driving energy for driving the movable contactor to an input position;

An opening / closing mechanism for transferring an input driving force from the input spring to the movable contact side between the input spring and the movable contact; And

In order to reduce the load of the closing spring acting on the opening / closing mechanism against the elastic force of the contact spring during the closing operation, except for the neutral contact of the movable contactor and the phase connected to the opening / closing mechanism among the remaining three phases. It can be achieved by providing an air circuit breaker according to the present invention, characterized in that it comprises an opening and closing shaft device for supporting at least one phase of the movable contact toward the fixed contact than other movable contact.

According to the present invention, by reducing the load (torque) transmitted to the opening and closing mechanism by the contact spring, it is possible to reduce the torque of the corresponding closing spring, so that the air circuit breaker capable of using the closing spring with less elastic force than the conventional one can be obtained. There is an effect.

In addition, according to the present invention, by reducing the load (torque) transmitted to the opening and closing mechanism by the contact spring, there is an effect of obtaining an air circuit breaker having an opening and closing shaft device for transmitting the opening and closing drive force that can extend the life of the opening and closing mechanism.

The object of the present invention and the configuration and effect of the present invention to achieve the same will be more clearly understood by the following detailed description with reference to the accompanying drawings.

First, in the air circuit breaker according to the present invention with reference to Figure 9 which is a plan view showing the relative position of the main opening and closing mechanism, the opening and closing shaft, the phase moving part lever, the phase movable contactor and the fixed contactor in the air circuit breaker according to the present invention The configuration of the breaker is as follows.

In FIG. 9, the left side is the front side of the air circuit breaker and the right side is the rear side. Fixed in the air circuit breaker of the present invention corresponding to the circuits of the R, S, T phase and the neutral phase N, in order to connect to the circuits of the R, S, T phase and the neutral phase on the right side, that is, the rear side of the air circuit breaker. Contacts 9a-9d are provided.

The circuit is electrically disconnected from the input position and the fixed contactor 9a-9d which are in contact with the fixed contactors 9a-9d at the center of the drawing, i.e., the center side of the air circuit breaker, to electrically conduct the circuit to which the air circuit breaker is connected. A plurality of movable contactors 8a-8d of R, S, T phase and neutral phases are provided to be movable to a blocking position to cut off and to face the corresponding fixed contacts 9a-9d of R, S, T phase and neutral phase. .

Connected to the R, S, T, and N phase movable contacts 8a-8d, and the R, S, T, and N phase fixed contacts 9a-9d and the R, S, T, and N phase movable contacts 8a-8d. A contact spring for imparting an elastic force to the R, S, T, and N phase movable contacts 8a-8d to increase the contact pressure is included in the air circuit breaker of the present invention, but is not shown in FIG. 9 and is not shown in FIGS. 10 and 11. See symbol 12.

In addition, as included in the air circuit breaker according to the present invention, an input spring for providing driving energy for driving the R, S, T, and N phase movable contacts 8a-8d to the input position is provided and is not shown in FIG. 9. Reference numerals 13 and 10 of FIG. 11 may be referred to.

In Fig. 9, the leftmost part, i.e., a component included in the air circuit breaker according to the present invention, denoted by the symbol 6 on the front side of the air circuit breaker, is the input spring and the R, S, T, N phase movable contacts 8a-. It is an opening / closing mechanism which transmits the injection driving force from the said injection | pouring spring between 8d) to the R, S, T, N phase movable contactors 8a-8d side.

In Fig. 9, reference numerals 4 and 7a to 7d are provided between the opening and closing mechanism 6 and the R, S, T, and N phase movable contacts 8a to 8d so that the opening and closing driving force from the opening and closing mechanism 6 is R, S. And an opening and closing shaft device for transmitting to the T and N phase movable contacts 8a-8d, in order to reduce the load of the closing spring acting on the opening and closing mechanism 6 against the elastic force of the contact spring during the closing operation. At least one of the R-, S-, T-, and N-phase movable contacts 8a-8d except for the N-phase movable contact 8d and the T-phase movable contact 8c connected to the switching mechanism among the remaining three phases, for example, R The upper movable contact 8a is supported to protrude from the other movable contacts 8b and 8c toward the corresponding fixed contact 9d and 9a.

That is, in FIG. 9, the R-phase movable contactor 8a and the N-phase movable contactor 8d have a front end portion of the fixed contactor 9d whose front end face corresponds to the remaining S-phase movable contactor 8b and the T-phase movable contactor 8c. , 9a) protrudes toward the virtual reference line A.

The reason for excluding the T contactor 8c connected to the opening / closing mechanism in the above is assuming that the movable contactor 8c of the T is configured to protrude, of course, the opening and closing shaft device should be configured accordingly. Since parts of the mechanism 6, i.e., the relative lengths and positions of the plurality of link mechanisms, etc. must be correspondingly changed and designed, it is not preferable to cause an increase in the manufacturing cost of manufacturing the air circuit breaker of the present invention.

The opening and closing shaft device is constituted as one opening and closing shaft 4 and movable part levers 7a-7d on R, S, T, and N which are fixed to the opening and closing shaft 4.

The front end faces of the R-phase movable contact 8a and the N-phase movable contact 8d protrude toward the fixed contactors 9d and 9a corresponding to the remaining S-phase movable contact 8b and the T-phase movable contact 8c. Positioned coincident with the virtual reference line A is the movable part lever of the N phase among the movable part levers 7a-7d of the R, S, T, and N phases fixed to the opening / closing shaft 4 as in the embodiment shown in FIG. At least one movable part lever, for example, the R phase movable part lever 7a, except for the movable part lever 7c connected to the opening / closing mechanism 6 among the movable part levers on the remaining R, S, and T, and the remaining movable part levers 7b, 7c. It can be made by further rotating toward the corresponding fixed contact (9a, 9d) than the fixed on the opening and closing shaft (4). The fixing on the opening and closing shaft of the movable lever can here be made by welding, for example.

10 is an operation state diagram showing tripping states of the opening / closing mechanism, the opening / closing shaft, the moving part lever of each phase, the moving contactor and the fixed contactor in the air circuit breaker according to the present invention. At least one except for the N-phase movable contact 8d among the R, S, T, and N-phase movable contacts 8a-8d and the T-phase movable contact 8c connected to the open / close mechanism 6 among the remaining three phases, for example For example, the characteristic of the structure which supports the R-phase movable contactor 8a so that it may protrude more than the movable contactors 8b and 8c toward the corresponding stationary contactors 9d and 9a is clear as a side view of the main structure of the air circuit breaker which concerns on this invention. Is showing.

As shown in Fig. 8, the R-phase movable contact 8a is configured to protrude more toward the stationary contact than the S-phase movable contact 8b in the blocking position in the characteristic configuration of the present invention.

Assuming that the closing spring 13 is condensed in the blocked state as shown in FIG. 8, when the opening / closing mechanism 6 is transmitted to the opening / closing shaft 4 as driving force for the closing of the preservative elastic energy of the closing spring 13. , The opening and closing shaft 4 rotates clockwise. Accordingly, the connection link 10 once connected to the opening / closing shaft 4 is advanced to the left in the drawing, so that the R-phase movable contactor 8a connected to the other end of the connection link 10 is the R-phase fixed contactor 9a. ) Is put into the circuit.

11 is an operation state diagram showing the operation state of the opening and closing mechanism, the opening and closing shaft, the moving part lever of the phase, the moving contactor and the fixed contactor in the air circuit breaker according to the present invention and the connection point of the connection link with the moving part lever of the connection link. It is a partial enlarged view showing that the moment arm of R phase is shorter than the moment arm of S phase with respect to the moment arm in which the extension line which connects the connection point with a movable contact is distanced from the center of an opening-and-closing axis | shaft.

Referring to Figure 11 describes the configuration features of the air circuit breaker according to the present invention and the resulting effects thereof.

As shown in FIG. 11, in the air circuit breaker according to the present invention, a movable contactor (the R-phase movable contact 8a in FIG. 11) and a fixed contactor (the R-phase fixed contactor 9a in FIG. 11) are in contact with each other ( In the energized state, the elastic force by the contact spring 12 acts on the R-phase movable contact 8a side at a pressure that maintains contact between the R-phase movable contact 8a and the R-phase fixed contact 9a. It is also transmitted toward the opening and closing mechanism 6. That is, the force acting in the latter direction of the elastic force by the contact spring 12 is the load (torque) of the moment to rotate the opening and closing shaft 4 via the connecting link 10 and the R-phase moving part lever 7a. Acts as. Here, the load (torque) of the moment to rotate the opening and closing shaft 4 is the connection point 10b with the R-phase movable part lever 7a of the connecting link 10, where the line of the circle part is the solid line and the dotted line, the solid line is the R-phase Since the connecting link is displayed and the dotted line indicates the connecting link of S phase and the extension line (upper of two connecting one-dot chain lines) connecting the connection point 10a between the R-phase movable contact 8a, the opening and closing shaft ( It is determined in proportion to the distance from the center of 4), that is, the length d1 of the R phase moment arm.

On the other hand, the magnitude | size of the moment according to the movable part lever 7b of S phase is the connection point (the dotted line part below code | symbol 10b below) of the connection link 10 with the S phase movable part lever 7b, and the S phase movable contactor (symbol 8a). The distance from the center of the opening / closing shaft 4, i.e., the extension line (the lower one of the two connecting single-dot chains) connecting the connection point (the dotted circle portion almost coinciding with the portion 10a) to the connection point with the dotted line portion below, i.e., the S phase moment It is determined proportionally to the length d2 of the arm.

Therefore, as can be seen in Figure 11, the length d2 of the S-phase moment arm is longer than the length d1 of the R-phase moment arm, for example, if the length d2 of the S-phase moment arm is 10, The length d1 is about six. Therefore, the load (torque) of the moment by the contact spring 12 transmitted to the opening / closing shaft 4 by the movable part lever 7b of S phase is the contact pressure transmitted to the opening / closing shaft 4 by the movable part lever 7a of R phase. The force spring (12) becomes larger in proportion to the length of the moment arm than the load (torque) of the moment by the spring (12), which according to the invention is the contact spring (12) transmitted to the opening and closing shaft (4) by the movable part lever (7a) of the R phase. Means that the load of the moment (torque) is reduced to less than the load of the moment transmitted by the movable lever of the other phase.

According to the present invention, the connection points of the connection links 10 with the R, S, T and N phase movable part levers 7a-7d and the R, S, T and N phase movable contacts 8a-8d of the connection link 10 are provided. Moment arm of the extension arm connecting the connection point with the distance away from the center of the opening and closing shaft 4, the moment arm of N phase and at least one phase except the phase connected to the opening and closing mechanism of the remaining three phases The arm has a shorter configuration feature than the moment arm on the other side. According to the configuration feature of the present invention, the moment by the contact spring 12 received by the opening and closing shaft 4 is the same as all the R, S, T, N-phase movable lever lever (7a-7d) to the opening and closing shaft (4) Experimental results show a 20% reduction compared to the fixed angle. This means that the load transmitted to the opening / closing mechanism 6 is reduced by 20%, and therefore, the closing spring 13 can also be manufactured using the one having a low elastic force of about 20%. Moreover, the life of the opening-closing mechanism 6 is extended and the life of the air circuit breaker can also be extended.

12 is a perspective view showing the overall internal structure of the air circuit breaker, such as the opening and closing shaft and the moving part lever, the opening and closing mechanism and the phase insulation unit showing that the present invention can be applied to the air circuit breaker having a large current carrying capacity. This is a perspective view showing the relationship between the opening and closing shaft and the moving parts of the lever in the air circuit breaker having a large current carrying capacity.

That is, the air circuit breaker illustrated in FIGS. 12 and 13 has a configuration feature in which a current shunt is formed in pairs for each phase in order to energize a large rated current. In such a high-capacity air circuit breaker, the configuration according to the present invention further includes a contact spring. It is effective to reduce the load of the opening and closing mechanism by.

In Fig. 12, movable contacts of R phase to N phase are provided in a space formed by adjacent pairs of the first to ninth insulating partition mold members 3a-3i. That is, one R-phase movable contactor is provided between the first and second insulating partition mold members 3a and 3b and between the second and third insulating partition mold members 3b and 3c, respectively. One S-phase movable contactor is provided between the partition wall mold members 3c and 3d and between the fourth and fifth insulating partition wall members 3d and 3e, respectively, and the fifth and sixth insulating partition wall members 3e and 3f are provided. One T-phase movable contactor is provided between each other and between the sixth and seventh insulating partition mold members 3f and 3g, and between the seventh and eighth insulating partition mold members 3g and 3h and the eighth and ninth insulation. One N-phase movable contactor is provided between the partition wall mold members 3h and 3i, respectively.

An opening / closing shaft 4 is provided adjacent to the front of the first to ninth insulating partition mold members 3a-3i so as to correspond to the full width of the first to ninth insulating partition mold members 3a-3i, and both ends are It is supported by the first and second shaft support brackets 5a and 5b.

The RN phase movable part levers 7a1, 7a2, 7b1, 7b2, 7c1, 7c2, 7d1, 7d2, which are connected to the movable contactor side of the open / close shaft 4 and transmit the open / close driving force of the open / close shaft 4, some of them Although not shown in FIG. 12 but may refer to FIG. 13) is fixedly installed. Here, implementation expectation The fixing method is welding.

In FIG. 12, the opening / closing mechanism 6 is installed to be connected to the N-phase movable part lever 7d1 shown in FIG. 13, and the reference numeral 11 denotes a compensation to which a compensation spring for connecting the horizontality change of the opening / closing shaft 4 is connected. It is a mechanism and has nothing to do with opening and closing operation.

In Fig. 13, reference numeral 11a denotes a connection lever with the compensation mechanism 11, and reference numeral 6a denotes a connection lever with the opening and closing mechanism 6.

In the air circuit breaker according to the present invention shown in Figs. 12 and 13, two R phase moving part levers 7a1 and 7a2, two S phase moving part levers 7b1 and 7b2, and two N phase moving part levers 7d1, T-phase movable part levers 7c1 and 7c2 and opening / closing mechanisms 6 having different fixed angles on the opening / closing shaft 4 of the N-phase movable part lever 7d2 except for the movable part lever 7d1 connected to the opening / closing mechanism 6 among 7d2). If it is fixed by rotating more toward the stationary contact than the N-phase movable portion lever (7d1) connected to the can be obtained an effect that can further reduce the load of the opening and closing mechanism (6) by the contact spring.

1 is a perspective view showing the overall internal structure of the air circuit breaker, such as the opening and closing shaft and the moving part lever, the opening and closing mechanism and the phase insulation in the air circuit breaker according to the prior art,

Figure 2 is a plan view showing the relative position of the opening and closing mechanism, the opening and closing shaft, the phase moving part lever, the phase movable contactor and the fixed contact in the air circuit breaker according to the prior art,

Figure 3 is a perspective view showing the installation relationship between the opening and closing shaft and the respective movable portion lever in the air circuit breaker according to the prior art,

Figure 4 is a side view showing the installation relationship between the opening and closing shaft and the respective movable portion lever in the air circuit breaker according to the prior art,

5 is an operating state diagram showing the operating state of the closing spring and the movable contactor in the disconnected state of the air circuit breaker according to the prior art,

6 is an operational state diagram showing a state in which the air circuit breaker is put in accordance with the prior art,

7 is an operation state diagram showing a state in which the closing spring in the air circuit breaker according to the prior art and the state in which the movable contactor is separated from the fixed contactor,

8 is a side view showing a configuration feature of the movable part lever of R in the air circuit breaker according to the present invention is fixed to the opening and closing shaft by rotating more toward the stationary contact than the movable part lever of the S phase,

9 is a plan view showing the relative position of the opening and closing mechanism, the opening and closing shaft, the moving lever lever of the phase, the movable contactor and the fixed contactor in the air circuit breaker according to the present invention,

10 is an operation state diagram showing a tripping operation state of the opening and closing mechanism, the opening and closing shaft, the phase movable part lever, the phase movable contactor and the fixed contactor in the air circuit breaker according to the present invention;

11 is an operation state diagram showing the operation state of the opening and closing mechanism, the opening and closing shaft, the moving part lever of the phase, the moving contactor and the fixed contactor in the air circuit breaker according to the present invention and the connection point of the connection link with the moving part lever of the connection link. It is a partial enlarged view showing that the moment arm of R phase is shorter than the moment arm of S phase with respect to the moment arm in which the extension line which connects the connection point with a movable contact is distanced from the center of an opening-and-closing axis | shaft.

12 is a perspective view showing the overall internal structure of the air circuit breaker, such as the opening and closing shaft and the moving part lever, the opening and closing mechanism and the phase insulation unit showing that the present invention can be applied to the air circuit breaker having a large current carrying capacity.

13 is a perspective view showing the relationship between the opening and closing shaft and the phase of the movable lever in the air circuit breaker having a large current carrying capacity.

* Explanation of symbols on the main parts of the drawings

1: air circuit breaker 2: rear insulated mold member

3a-3e: first to fifth insulating partition mold members

4: opening and closing shaft (spindle)

5a: first axis support bracket 5b: second axis support bracket

6: switchgear 6a: switch mechanism side connecting lever

7a-7d: R, S, T, N phase moving part lever

8: Movable contactor 8a-8d: R, S, T, N phase movable contactor

9a-9d: R, S, T, N phase fixed contact

10: connection link 10a, 10b: connection point

11: compensator 12: contact spring

13: Input spring A: virtual baseline

d1: length of R phase moment arm

d2: length of S phase moment arm

Claims (4)

In the air circuit breaker, Fixed contacts provided corresponding to the circuits of R phase, S phase, T phase and N phase which are neutral phases; The R, S, T phase and the neutral phase are movable to a closing position for electrically disconnecting the circuit by being separated from the fixed contactor by being in contact with the fixed contactor to electrically energize the circuit to which the air circuit breaker is connected. A plurality of movable contacts of R, S, T phase and neutral commercially provided to face the fixed contacts; A contact spring connected to said movable contactor for applying an elastic force to said movable contactor to increase the contact pressure of said fixed contactor and said movable contactor; An input spring for providing driving energy for driving the movable contactor to an input position; An opening / closing mechanism for transferring an input driving force from the input spring to the movable contact side between the input spring and the movable contact; And The closing spring is provided between the opening and closing mechanism and the movable contact to transfer the opening and closing driving force from the opening and closing mechanism to the movable contact, and the closing spring acts on the opening and closing mechanism against the elastic force of the contact spring during the closing operation. In order to reduce the load, the movable contactor of the neutral contact among the movable contacts and the movable contactor for the phase (for example, T-phase) connected to the opening / closing mechanism among the remaining three phases (R, S, T phase) at the cut-off position And an opening and closing shaft device for supporting the movable contactor for at least one phase (e.g., at least one of the R and S phases) to protrude toward the corresponding fixed contactor than the movable contactor for the other phase (e.g., T-phase). A lifter, characterized in that configured The method of claim 1, The opening and closing shaft device, One opening and closing shaft; At least one movable part lever except for the movable part lever of R, S, T, and N fixed to the opening and closing shaft, wherein the movable part lever of N and the movable part lever of the remaining movable part levers of R, S, and T are connected to the opening and closing mechanism. And a movable part lever which is further rotated toward the corresponding fixed contact than the other movable part lever and fixed on the opening / closing shaft. In the air circuit breaker, Fixed contacts provided corresponding to the circuits of R phase, S phase, T phase and N phase which are neutral phases; It is possible to move to an interruption position for electrically disconnecting the circuit by contacting the fixed contactor and electrically disconnecting the circuit from which the air circuit breaker is connected and disconnecting from the fixed contactor, the R, S, T phase and N phase A plurality of movable contacts of R, S, T phase and N commercially provided to face the fixed contact; A contact spring connected to the movable contactor, the contact spring being provided to apply an elastic force to each movable contactor to increase the contact pressure of the fixed contactor and the movable contactor; An input spring for providing driving energy for driving the movable contactor to an input position; An opening / closing mechanism for transferring an input driving force from the input spring to the movable contact side between the input spring and the movable contact; Movable levers on R, S, T and N provided for each of the R, S, T and N phases and driven to transfer the driving force to the movable contact for movement to the closing position and the blocking position, wherein the contact spring is in the closing position. In order to reduce the load of the closing spring acting on the opening and closing mechanism against the elastic force imposed by, the movable contacting member of the neutral contact and the opening and closing of the remaining three phases (R, S, T phase) and The movable part lever driven to the movable contactor for at least one phase (e.g., at least one of the R phase and the S phase) except for the connected phase (e.g., the T phase) has a phase other than these (e.g., T phase) toward the fixed contactor. Movable part levers on the R, S, T, and N parts which are installed to rotate more than the movable part levers for dragons; And And an opening and closing shaft to which the movable part levers are fixed and to provide an opening and closing driving force to open and close the movable contactor to the movable part levers. The method of claim 3, And a connection link connected between the movable part lever and the movable contactor, the connecting link having a connection point with the movable part lever and a movable contact point, and for transmitting an opening and closing driving force from the movable part lever to the movable contactor, A neutral arm and a remaining three phase (R) with respect to a moment arm in which an extension line connecting the connection point of the connection link with the movable part lever and the connection point with the movable contact is a distance away from the center of the opening and closing shaft. Moment arm of at least one phase (e.g., at least one of R phase and S phase) except phase (e.g., T phase) connected to the opening / closing mechanism among the other phases (e.g., R phase and S phase) A phase breaker shorter than the moment arm of the other phase or T phase).

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