KR20030016977A - circuit trip device with function for controlling trip time in MCCB - Google Patents

Abstract

PURPOSE: A momentary false control trip device of a wiring circuit breaker is provided to false-control a momentary breaking current at a lower rating less than 100A by applying a torsional force of a torsion spring to an opposite direction. CONSTITUTION: A magnet(400) generates an attractive force in a trip case(6) and a cover(7). An armature(401) operates by the attractive force from the magnet(400). A link member(402) is installed at one end of the armature(401). A tensile spring(403) is connected to one side of the link member(402). An instant bar(404) is rotatively installed at one end of the tensile spring(403). A dial contacts with the other end of the instant bar(404) and rotates the instant bar(404) in up and down directions. A torsion spring(406) is installed a down direction of the armature(401) to add a torsional force so that the armature(401) is always rotated to the magnet(400).

Description

Instantaneous adjustable trip device of circuit breaker {circuit trip device with function for controlling trip time in MCCB}

The present invention relates to an instantaneous adjustable trip device of a circuit breaker. More specifically, the torsion spring installed below the armature adds a torsional force in a direction opposite to that of the conventional low rating (50 to 100 A). It relates to an instantaneous adjustable trip device of a circuit breaker in which the instantaneous breaking current value can be adjusted within the range.

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.

In addition, the above-mentioned 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, and a trip generated when the instantaneous current passes during the trip state. Refers to instantaneous trip function that detects when the current applied to the breaker is instantaneously applied at a constant magnification of the rated current and trips it at a suitable time for a certain magnification.

1 is a block diagram showing a general wiring breaker, the conventional wiring breaker is a case (1) and cover (2) for forming an enclosure, the opening and closing mechanism (3) for mechanically opening and closing the converter and And a tripping unit 4 which detects the occurrence of an abnormal current or an accidental current so that the opening / closing mechanism unit 3 is operated, and a extinguishing unit 5 which extinguishes an arc generated between the contacts during the breaking operation.

2 is a perspective view illustrating a conventional trip part of a circuit breaker, and the conventional trip part of the circuit breaker includes various parts for performing an instantaneous interruption operation in the trip part case 6 and the cover 7 forming an enclosure. This will be described in more detail with reference to FIG. 3.

In FIG. 3, the trip part case 6 and the cover 7 are installed to face each other at a predetermined distance from the magnet 400 generating a attraction force when an abnormal current is energized, and the magnet 400 is attracted to the attraction force of the magnet 400. An armature 401 operated by the armature, a link member 402 installed at one end of the armature to adjust a distance between the magnet 400 and the armature 401, and a magnet 400 connected to one side of the link member. And a tension spring 403 for applying tension to adjust the gap between the armature and the armature 401, an instant bar 404 having one end connected to the tension spring and rotatable up and down about an axis, and the other of the instant bar. The dial 405 which rotates the instant bar 404 upward or downward in a predetermined amount in contact with the end and the inclined surface, and is installed below the armature 401 so that the armature rotates to the opposite side of the magnet 400. The torsion spring 406 etc. which add a torsion force so that it may move is provided.

Looking at the operation of such components, when the operator temporarily adjusts the instantaneous breaking current value of the breaker, it is possible by rotating the dial 405 installed on the top in one direction, first to adjust the instantaneous breaking current value to the minimum As the dial 405 is rotated in the clockwise direction, the lower end portion of the dial 405 is formed in a spiral shape as shown in FIG. 3, so that the instant bar 404 in contact with the inclined surface is in contact with the inclined surface. Since the dial 405 is rotated in the clockwise direction, one end of the instant bar 404 is eventually located at the top of the spiral because it rotates upward gradually.

Accordingly, since the tension spring 403 installed at the opposite end of the instant bar 404 is not pulled tight and becomes loose, the tension acting on the tension spring 403 becomes minimal, and the tension spring 403 Since the link member 402 connected to the puller pulls the armature 401 toward the magnet 400, the spacing between the magnet 400 and the armature 401 is minimized at this time.

In general, the magnetic force (= magnet attraction force) required for the magnet 400 to pull and operate the armature 401 in the breaker is proportional to the distance between the magnet 400 and the armature 401, and thus the instantaneous breaking current value This minimum adjustment means that the gap between the magnet 400 and the armature 401 is narrowly adjusted so that the armature 401 can operate at the momentary instantaneous breaking current value.

Therefore, it is understood that the instantaneous breaking current value of the breaker is adjusted to the minimum value by the above process.

On the other hand, in order to adjust the instantaneous breaking current value of the breaker to the maximum, it is possible by rotating the dial 405 counterclockwise. In this case, the instant bar 404 moves downward along the spiral of the dial 405. While slowly rotating, one end of the instant bar 404 is positioned at the lowest point of the spiral.

Accordingly, the tension of the tension spring 403 provided at the opposite end of the instant bar 404 is maximized, and the link member 402 provided at the tension spring 403 has the armature 401 as the magnet 400. Since it rotates in a direction away from the maximum distance between the magnet 400 and the armature 401 is maximized.

Therefore, the instantaneous breaking current value of the circuit breaker is adjusted to the maximum value because the distance between the magnet and the armature is adjusted to the maximum.

However, this conventional instantaneous adjustable trip device has a constant force to rotate to the opposite side of the magnet by the torsion spring installed below the armature, so that the distance between the armature and the magnet is constant without the dial being adjusted. It takes the form of a gap.

It is possible to adjust the instantaneous breaking current value at the rating of 100A or more in the wiring breaker, but it is very difficult to adjust the instantaneous breaking current value at the low rating due to the above structural problem at the rating below 50A. There was this.

On the other hand, in order to solve the above problems, in order to increase the attraction force of the magnet in the past had to install a separate device, this is not only increases the size of the entire device, but also increases the number of parts required and production cost increases There were various problems to be done.

The present invention has been made to solve the above-described problems, by improving the configuration of the conventional tripping portion is configured to add a torsion spring in the opposite direction to the torsion spring installed in the armature, the instantaneous breaking current value at a low rating of 100A or less It is an object of the present invention to provide an instantaneous adjustable trip device for a circuit breaker that can be adjusted.

1 is a configuration diagram showing a typical circuit breaker

Figure 2 is a perspective view showing the appearance of a conventional tripping portion of the circuit breaker

FIG. 3 is a longitudinal sectional view of the main part of FIG. 2, showing an operation state of each component in the trip unit. FIG.

Figure 4 is a main configuration of the present invention, a state diagram showing a direction in which the torsional force of the torsion spring acts

Figure 5a is a plan view and a side view showing a device according to the invention, the operational state diagram showing a state in which the instantaneous breaking current value of the trip unit is adjusted to the minimum

Figure 5b is a plan view and a side view showing a device according to the present invention, the operation state diagram showing a state in which the instantaneous breaking current value of the trip unit is adjusted to the maximum

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

3: open / close mechanism part 4: trip part

5: SOHO 400: Magnet

401: Amateur 402: Link member

403: tension spring 404: instant bar

405: Dial 406: torsion spring

According to the present invention for achieving the above object, a magnet that generates an attraction force when an abnormal current is energized, an armature which is installed to face the magnet at a predetermined interval and is operated at a suction force of the magnet, and is installed at one end of the armature. A link member for adjusting the gap between the magnet and the armature, a tension spring connected to one side of the link member to add tension for adjusting the gap between the armature and the magnet, and one end connected to the tension spring, the upper and lower sides of the shaft being connected to each other. An instant bar installed to be rotatable, a dial for rotating the instant bar upward or downward along a spiral in contact with the other end of the instant bar inclined surface; With torsion spring In the configuration, the instantaneous breaking trip device of the circuit breaker is provided, wherein the instantaneous breaking current value of the device can be adjusted within the range of 50 to 100A by installing the torsion spring so that the armature rotates toward the magnet. .

Hereinafter, the present invention will be described in more detail with reference to FIGS. 4 to 5.

4 is a state diagram showing the direction in which the torsional force of the torsion spring acts, and FIG. 5A is a plan view and a side view of the device according to the present invention, and the instantaneous breaking current value of the tripping part is minimum. FIG. 5B is a plan view and a side view of the apparatus according to the present invention, in which the instantaneous breaking current value of the trip unit is adjusted to the maximum.

Hereinafter, the main configuration of the apparatus according to the present invention will be described in detail.

Referring to FIG. 4 or 5, the magnet 400 generating an attraction force when an abnormal current is energized in the trip part case 6 and the cover 7 and the magnet 400 are disposed to face each other at a predetermined interval. Armature 401 is operated by the attraction force, the link member 402 is provided at one end of the armature to adjust the distance between the magnet 400 and the armature 401, and the magnet is connected to one side of the link member ( A tension spring 403 for applying tension for adjusting the gap between the armature 400 and the armature 401, an instant bar 404 having one end connected to the tension spring and rotatably installed upward or downward about an axis; The other end of the instant bar is in contact with the inclined surface and the dial 405 or the like is installed to rotate the instant bar a predetermined amount upward or downward along the spiral is the same as the conventional configuration.

In particular, since the torsion spring 406 provided below the armature 401 is installed in the opposite direction as in the prior art, a torsional force is added so that the armature 401 always has a property to rotate toward the magnet 400.

Looking at the operation of these components, the first torsion spring 406 installed below the armature 401 as shown in Figure 4 in the state that each component is assembled in the case 6 and the cover 7 of the trip portion 4 Unlike the conventional configuration, since the torsional force is always added to the magnet 400 side (in the direction of the arrow shown in the drawing), the armature 401 is always in a state of being rotated toward the magnet 400. In the state where the gap between the armature 401 and the magnet 400 is not applied to another external force, the gap can be maintained in a close state.

In this state, when the user rotates the dial 405 counterclockwise as shown in FIG. 5A to adjust the instantaneous breaking current value to the minimum, the tension of the tension spring 403 is minimized at this time as described in the related art. The gap between the armature 401 and the link member 402 is minimized according to the tension of the tension spring 403.

Accordingly, when the instantaneous breaking current value of the breaker is proportional to the distance between the tension spring 403 and the magnet 400, the instantaneous breaking current value of the breaker is adjusted to the minimum.

Then, when the user wants to adjust the instantaneous cutoff current value again, the dial 405 may be rotated clockwise. In this case, the tension spring 403 is pulled taut to maximize the tension, and thus the link member ( It is understood that the armature 401 linked by 402 is also spaced apart from the magnet 400 so that the gap between the two is maximized.

Therefore, the instantaneous breaking current value of the equipment is adjusted to the maximum value at this time.

However, in the present invention, since the distance between the armature and the magnet is made within a range not conventionally realized, it is possible to adjust the instantaneous breaking current value of the breaker within the low rating range 50 to 100A.

This is an essential part of the present invention, and has the advantage of conveniently adjusting the instantaneous breaking current value in the same manner as the conventional art.

Due to this, in order to adjust the instantaneous breaking current value within the range of the low rating, conventionally, the size of the device is increased not only by increasing the size of the device, but also by increasing the number of parts according to a mechanism or an electric additional device. There was a problem that leads to a rise in production cost, but the present invention provides a direction for solving the problem.

The instantaneous adjustable trip device of the circuit breaker of the present invention is configured such that the torsion spring of the armature adds a torsional force in a direction opposite to that of the prior art. Temporary adjustment of the instantaneous breaking current value is possible within.

Accordingly, it is possible to spread the circuit breaker operating within the low rating range to meet the user's needs, and to reduce the production cost of the device by reducing the size of the device or the number of parts. In addition, since the instantaneous breaking current value can be adjusted simply by operating only the dial as in the related art, it is very effective because there is an advantage that the provisional adjustment work according to the load change can be conveniently performed.

Claims (1)

A magnet that generates manpower when an abnormal current is energized, an armature which is disposed to face the magnet at a predetermined interval, and is operated by a suction force of the magnet, and a link member installed at one end of the armature to adjust the gap between the magnet and the armature And a tension spring connected to one side of the link member to add tension to adjust an interval between the armature and the magnet, and an instant bar connected to one end of the tension spring and pivoted up and down about an axis. In the configuration comprising a dial for rotating the instant bar up or down along the spiral in contact with the other end and the inclined surface, and a torsion spring installed below the armature to add a torsion force so that the armature rotates to the opposite side of the magnet, And a torsion spring is installed so that the armature rotates toward the magnet, so that the instantaneous breaking current value of the device can be adjusted within a range of 50 to 100 A.