KR200440694Y1 - Instant trip apparatus of molded case circuit breaker - Google Patents

Abstract

The present invention relates to a forward seating device for a circuit breaker, the yoke of a nonmagnetic material in the form of a container; A ferromagnetic yoke plate for closing the opening of the yoke; A coil installed inside the yoke to allow a current to pass therethrough; A fixed core generating magnetic force when an abnormal current flows in the coil; A movable core attracted to the fixed core while linearly moving when a magnetic force is generated in the fixed core; An instant bar connected to the movable core to linearly move the movable core; A crossbar connected to the instant bar to rotate the instant bar while moving; A set screw fixedly coupled to the instant bar and configured to change a moment with respect to a rotation center of the instant bar; A tension spring having one end fixed to the yoke plate and the other end fixed to the set screw; It is configured to include.

As a result, the instantaneous current value can be finely adjusted by varying the load and the moment of the tension spring, so that the precise instantaneous characteristic value can be maintained, the number of parts can be reduced by using a single tension spring, and the adjustment process is easy. .

Circuit Breaker, Net Seat Device, Set Screw, Tension Spring

Description

INSTANT TRIP APPARATUS OF MOLDED CASE CIRCUIT BREAKER}

Figure 1 is a schematic diagram showing the internal configuration of a conventional circuit breaker,

2 is a perspective view illustrating the trip unit of FIG. 1;

3 is a side cross-sectional view of FIG.

4 is a perspective view illustrating a trip part of a circuit breaker according to an embodiment of the present invention;

5 is a side view of the trip part of FIG. 4.

** Description of the symbols for the main parts of the drawings **

250: trip part 251: coil

252: York 253: York Plate

254: spring fastening 255: movable core

260: instant bar 261: hit part

262: screw connection 265: adjustment dial

270: crossbar 271: protrusion

275: set screw 276: locking portion

278: tension spring

The present invention relates to a circuit breaker that is an electrical device that protects a circuit and a load by automatically detecting a circuit when an abnormal current occurs due to an overload or a short circuit on an electric line, and more specifically, an instantaneous current value. The present invention relates to a forward circuit breaker for a circuit breaker, which is capable of maintaining a precise instantaneous characteristic value by finely adjusting.

In general, wiring breakers are divided into terminal parts connecting the power supply side and the load side, a mechanism part that opens and closes the contact between the stator and the mover, and detects when an abnormal current such as overcurrent, instantaneous current, or short-circuit current occurs on the power supply side. It consists of a trip part which induces a trip so that a power supply may be cut off by operating a mechanism part.

Such a circuit breaker detects this in the breaker and automatically cuts off the current regardless of artificial opening and closing of the breaker when an abnormal current occurs. This is called a normal trip. In particular, the trip generated when passing instantaneous current senses when the current applied to the breaker is instantaneously applied at a constant magnification of the rated current, and means tripping at a suitable time at a certain magnification. This function is called an instantaneous trip function.

1 is an overall configuration diagram of a conventional circuit breaker. The circuit breaker includes a case 110 and a cover 120 for accommodating parts, an opening and closing mechanism 140 for mechanically opening and closing a converter, and an abnormal current or an accident. The trip unit 150 detects the current when the current is generated and makes the mechanism operate, and the extinguishing unit 180 extinguishes the arc generated between the contacts during the blocking operation.

Hereinafter, since the description of the opening and closing mechanism 140 and the extinguishing portion 180 is known, it will be omitted.

2 and 3, the trip unit 150 includes a coil 151 through which a current passes, a movable core 155 for generating a magnetic force when an abnormal current flows through the coil 151, and A fixed core 156, an instant bar 160 for controlling the movement of the movable core 155, an adjustment dial 165 having a gear shape, and a rotational movement of the adjustment dial 165; A cross bar 170 for adjusting the instant bar 160 by converting it to a linear motion, and a shooter 175 for applying a shock to the opening / closing mechanism 140 at tripping to block the converter. It is configured by.

The instant bar 160 has a hitting part 161 hitting the protrusion 171 of the crossbar 170 at one end thereof, and a locking groove 162 formed at the other end thereof so that the tension spring 178 is fixed thereto.

Unexplained reference numeral 152 is a yoke, 153 is a yoke plate, 157 is a movable core pin, I is an input terminal, and P is an output terminal.

According to such a configuration, when an abnormal current flows in the coil 151 in the trip unit 150, a conventional circuit breaker generates a magnetic field in the fixed core 156, attracts the movable core 155, and moves the movable core ( 155 is rotated about the movable core pin (157). At this time, when a magnetic force that overcomes the tension of the tension spring 178 that is connected between the yoke plate 153 and the instant bar 160 occurs, the movable core 155 is pulled downward and at the same time a hit of the instant bar 160. 161 hits the protrusion 171 of the crossbar 170, and trips by opening and closing the mechanism 140 by the impact received by the crossbar 170.

However, such a conventional circuit breaker has a difficulty in maintaining a uniform instantaneous characteristic value for each phase under a small rating (1.6A to 10A).

Therefore, it is necessary to manage and replace various types of tension springs that meet the instantaneous trip characteristics of each rating, thereby increasing the number of parts and adjusting process.

The present invention has been made in view of the above problems, and its purpose is to make it easy to adjust the trip current value in a small rated situation by artificially adjusting the tension spring load value through the change of the locking point.

The present invention to achieve the above object, yoke of the nonmagnetic material in the form of a container; A ferromagnetic yoke plate for closing the opening of the yoke; A coil installed inside the yoke to allow a current to pass therethrough; A fixed core generating magnetic force when an abnormal current flows in the coil; A movable core attracted to the fixed core while linearly moving when a magnetic force is generated in the fixed core; An instant bar connected to the movable core to linearly move the movable core; A crossbar connected to the instant bar and rotating the instant bar; A set screw fixedly coupled to the instant bar and configured to change a moment with respect to a rotation center of the instant bar; A tension spring having one end fixed to the yoke plate and the other end fixed to the set screw; Provided is a forward-slip device for a circuit breaker that includes.

Wherein the tension spring is characterized in that the point is changed according to the amount of rotation of the set screw to change the load value.

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

First, referring to FIG. 1 of the related art, the circuit breaker of the present invention has a case 110 and a cover 120 for accommodating parts, an opening and closing mechanism 140 for mechanically opening and closing a converter, and an abnormal current or accident. The trip part 250 (see FIG. 4) for detecting the current when the current is generated and allowing the mechanism to be operated, and the extinguishing part 180 for extinguishing the arc generated between the contacts during the breaking operation.

As illustrated in FIGS. 4 and 5, the trip unit 250 includes a coil 251 for penetrating a current, a movable core 255 and a fixed core in which magnetic force is generated when an abnormal current flows in the coil 251. (Not shown), an instant bar 260 for controlling the movement of the movable core 255, and an adjustment dial for varying the distance between the movable core 255 and the fixed core with a gear shape. 265, a cross bar 270 for adjusting the instant bar 260 by converting the rotational movement of the adjustment dial 265 into a linear motion, and applying an impact to the opening / closing mechanism 140 when tripping. It includes a shooter (see Fig. 1) for blocking the converter.

The coil 251 is wound around a bobbin (not shown) installed inside the yoke 252 of a nonmagnetic material in the form of a container. At this time, the opening of the yoke 252 is closed by the yoke plate 253 of the ferromagnetic material.

The yoke plate 253 is formed in the spring fastening portion 254 to protrude in the direction of the plate surface so that one end of the tension spring 278 is fixed.

The instant bar 260 is a plate-shaped screw is formed so that one end hits the projecting portion 271 of the cross bar 270 and the other end of the set screw (Set Screw) 275 to be described later It comprises a fastening portion 262.

The crossbar 270 supports the shooter and is connected to the instant bar 260 to rotate the instant bar 260 to move the opening and closing mechanism 140.

Meanwhile, the set screw 275, which is a feature of the present invention, is fixedly coupled to the screw fastening portion 262 of the instant bar 260 to be disposed between the instant bar 260 and the tension spring 278. At this time, one end of the tension spring 278 is connected to the spring fastening portion 254 of the yoke plate 253, the other end is connected to be caught by the concave engaging portion 276 of the set screw 275.

Reference numeral 263 denotes the rotation center of the instant bar, I is an input terminal, and P is an output terminal.

Hereinafter, the operation of the circuit breaker of the present invention will be described.

According to the above configuration, when the abnormal current flows in the coil 251 in the trip part 250, a magnetic field is generated in the fixed core to attract the movable core 255, and the movable core ( 255 is rotated about the movable core pin (see 175 in FIG. 3). At this time, when a magnetic force that overcomes the tension of the tension spring 278 connected between the yoke plate 253 and the instant bar 260 is generated, the movable core 255 is pulled downward and at the same time a hit of the instant bar 260. 261 strikes the protrusion 271 of the crossbar 270, and trips by opening / closing the mechanism 140 by an impact received by the crossbar 270.

At this time, if the instantaneous current value is large, the error and tolerance of each part are negligible because the electromagnetic force is strong.However, if the instantaneous current value is small, the electromagnetic force is weak, resulting in deviation of the characteristic value against the error and tolerance of the parts. Need to adjust.

In view of this, the present invention is to increase the moment with respect to the center of rotation 263 of the instant bar 260 by changing the point of the tension spring 278 by further configuring the set screw 275 that is not conventionally configured.

That is, when the set screw 275 is rotated in the right direction, the point of the tension spring 278 moves in one direction. The instant bar 260 increases the moment with respect to the center of rotation 263, and the moment increases. The instantaneous current value also becomes large. On the contrary, when the set screw 275 is rotated to the left side, the instant bar 260 has a small moment with respect to the rotation center 263, and the instantaneous current value is also reduced.

As described above, the part tolerance and the assembly error are changed according to the rotation of the set screw 275 by artificially changing the point of the tension spring 278 to change the load and the moment of the tension spring 278 to precisely adjust the instantaneous current value. The characteristic value can be maintained.

Therefore, the number of parts can be reduced by using a single tension spring, and the adjustment process is facilitated.

The circuit breaker of the circuit breaker according to the present invention can maintain the precise instantaneous characteristic value by finely adjusting the instantaneous current value by changing the load and moment of the tension spring, and can reduce the number of parts by using a single tension spring. This has the advantage that the adjustment process is easy.

Claims (2)

Yoke of nonmagnetic material in container form; A ferromagnetic yoke plate for closing the opening of the yoke; A coil installed inside the yoke to allow a current to pass therethrough; A fixed core generating magnetic force when an abnormal current flows in the coil; A movable core attracted to the fixed core while linearly moving when a magnetic force is generated in the fixed core; An instant bar connected to the movable core to linearly move the movable core; A crossbar connected to the instant bar to rotate the instant bar while moving; A set screw fixedly coupled to the instant bar and configured to change a moment with respect to a rotation center of the instant bar; A tension spring having one end fixed to the yoke plate and the other end fixed to the set screw; Net-slip device of a circuit breaker containing. The method of claim 1, The tension spring of the circuit breaker for a circuit breaker, characterized in that the point is changed according to the amount of rotation of the set screw changes the load value.

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