KR200406794Y1 - Circuit breaker for motor protection - Google Patents

Abstract

The present invention relates to a circuit breaker for protecting a motor. An external phase insulation device capable of simultaneously isolating phases between the wire fastening portion and the arc ejection portion of the circuit breaker can be detachably attached to the terminal portion of the circuit breaker, thereby preventing insulation of the wires. Secondary accidents caused by arc can be prevented.

The circuit breaker for protecting a motor according to the present invention for this purpose, the terminal portion and the lower frame, the guide groove formed in a straight line between each phase from the upper end of the terminal portion to the bottom surface of the lower frame, and the first formed on the upper end of the guide groove A fixing hole and a second fixing hole formed in the bottom surface of the lower frame below the guide groove; The external interphase insulation device portion, a protruding portion protruding to be inserted into and fixed to the first fixing hole on one side of the body portion, and a lower end of the body portion is inserted into and fixed to the second fixing hole. And a fixing protrusion formed to protrude.

Circuit Breaker, Insulation Device, Terminal, Wire, Lower Frame, Arc

Description

CIRCUIT BREAKER FOR MOTOR PROTECTION}

1 is an exploded perspective view of a circuit breaker for protecting a motor and an external phase insulator according to the related art.

2 is a perspective view illustrating a coupling between a circuit breaker for protecting a motor and an external phase insulator according to the related art.

3 is an exploded perspective view of a circuit breaker for protecting a motor and an external phase insulator according to the present invention;

4 is a perspective view of the coupling between the circuit breaker for protecting the motor and the external phase insulator according to the present invention

5 is a perspective view of an external interphase insulation device according to the present invention

***** Explanation of symbols for the main parts of the drawing *****

100: circuit breaker for motor protection

110: main body 111: closing block

113: terminal portion 114: first fixing hole

117: protrusion wing 119: guide groove

120: lower frame

121: bottom surface of the lower frame 123: exhaust hole

125: second fixing hole

130: the body portion of the external interphase insulation device or the body of the external phase insulation device

131: protrusion

133: position guide wing 135: fixing protrusion

The present invention relates to a circuit breaker for protecting a motor used for the purpose of protecting the burnout in the event of an overload and short circuit of the motor. It is about.

In general, the motor protection wiring breaker includes a detection unit for detecting an accident current such as an overcurrent, an open phase, an instantaneous current, a short circuit current, an open / close mechanism unit for tripping the breaker according to a detection signal of the detection unit, and the open / close mechanism unit. In accordance with the operation of the contact portion for opening and closing the converter, and the arcing portion for extinguishing the arc generated when the contact of the contact portion is spaced and discharged to the outside is provided.

When the motor protection circuit breaker as described above is normally energized, the movable contact point of the contact part and the fixed contact point are connected to conduct current flowing into the power supply terminal to the load terminal, but when an accident current occurs, the trip unit detects this and drives the open / close mechanism part. The movable contact of the movable contact is separated from the fixed contact of the fixed contact by the operation of the opening and closing mechanism to block the flow of current to the load side.

On the other hand, as described above, the arc generated when the movable contact of the movable contact point is spaced apart from the fixed contact of the fixed contact point is quickly guided to the extinguishing side is extinguished and then discharged to the outside through the exhaust hole formed in the lower frame.

Hereinafter, with reference to the accompanying drawings will be described in more detail with respect to the conventional motor protection wiring breaker.

1 and 2 illustrate an exploded perspective view and a combined perspective view of a circuit breaker for protecting a motor and an external phase insulator according to the related art.

As shown in FIG. 1 and FIG. 2, the conventional motor protection wiring breaker 1 includes a main body 10 of the circuit breaker and a lower frame 20 coupled to a lower end of the main body 10. . The upper end of the main body 10 is provided with a handle 11 for closing the input, the terminal portion 13 is provided on both sides. The terminal portion 13 shows a three-phase terminal as an example, as shown in the figure. The terminal part 13 is provided with a wire fastening part 15 for connecting and fastening an electric wire (not shown), and a protruding wing part 17 is integrally formed between the terminal part and the terminal part. In addition, a terminal portion side hole 14 for fixing an external phase insulation device 30 is formed at an upper end portion of the terminal portion 13 between the protruding wing portions 17. Here, the terminal portion 13 can be separated from the enclosure main body portion 10 of the circuit breaker, it is possible to control the electric motor by connecting a wire.

In addition, the motor circuit breaker 1 is formed with an exhaust hole 23 for ejecting an arc out of the lower frame 20 below the terminal portion 13.

The motor circuit breaker 1 is provided with an external phase insulation device 30 for inserting the terminal side hole 14 to isolate the wire fastening portion 15. As shown in FIG. 1, the external inter-phase insulation device 30 has a protrusion 31 formed at one side to be inserted into and fixed to the side hole 14 of the terminal portion.

The conventional external phase insulator 30 having the above configuration is inserted into the terminal portion side hole 14 to isolate each phase of the portion having the wire fastening portion 15 as shown in FIGS. 1 and 2. By doing so, it is possible to prevent foreign matter from flowing into the wire fastening part 15, and also to prevent a short circuit accident that may occur at a wire part during maintenance work.

However, as described above, the external interphase insulation device 30 of the conventional motor protection wiring breaker 1 is mounted on the terminal portion 13 of the wiring breaker, and a short circuit accident occurs at the wire fastening portion 15. Although it can be prevented, the arc ejected through the exhaust hole 23 as shown in Figure 2 was not isolated.

Therefore, the conventional external inter-phase insulator 30 having the above-described structure cannot isolate the phase between the exhaust hole 23 in which the arc is ejected, and thus, the arc ejected through the exhaust hole 23 when an accident current occurs. There was a problem that a secondary arc short circuit accident may occur.

The present invention is devised to solve the above problems, and the object of the present invention is to be detachable to the terminal portion of the circuit breaker for the external phase insulator that can isolate the phase between the wire fastening portion and the arc ejection portion of the wiring breaker at the same time. The present invention provides a circuit breaker for protecting a motor that can prevent secondary accidents caused by insulation and arcing of electric wires.

In addition, another object of the present invention is to guide the assembly to the correct position when the external phase insulator is assembled to the terminal portion of the wiring breaker, and after the assembly is a position guide blade that can prevent the flow and departure from the outside The present invention provides a circuit breaker for protecting a motor additionally provided to an insulator.

In order to achieve the above object, a circuit breaker for protecting a motor according to the present invention,

A main body portion having a handle driving device for closing and closing, a terminal portion having a wire fastening portion detachably installed at one side and the other side of the main body portion, and coupled to the lower end of the main body portion and the terminal portion; In the circuit breaker for protecting a motor, comprising a lower frame having an exhaust hole for ejecting arc on the other side, and an external phase insulator device that isolates and protects each phase between the terminals.

The terminal portion and the lower frame is:

A guide groove formed in a straight line between each phase from an upper end portion of the terminal portion to a bottom surface of the lower frame, a first fixing hole formed in an upper end portion of the guide groove, and a bottom surface of the lower frame below the guide groove; And a second fixing hole formed in the; The outer phase insulation device portion: a body portion forming an external shape,

A protruding portion protruding to be inserted into and fixed to the first fixing hole at one side of the body portion, and a fixing protrusion protruding to be inserted into and fixed to the second fixing hole at a lower end of the body portion.

Here, the external phase insulator device portion is characterized in that it further comprises a position guide blades protruding on the upper end of the body portion to guide to the correct position when assembling the external phase insulator device portion.

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

3 and 4 are an exploded perspective view and a combined perspective view of the circuit breaker for protecting the motor and the external phase insulator according to the present invention.

3 and 4, the circuit breaker 100 for protecting the motor of the present invention is attached to and detached from one side and the other side of the main body 110 having a handle driving device for closing the input, and the main body 110. A three-phase terminal portion 113, each of which has a wire fastening portion 115, which is installed to be possible and connects electric wires capable of transmitting power required for driving an electric motor, and is coupled to a lower end of the main body portion 110 and the terminal portion 113; And the lower frame 120 having the exhaust hole 123 and the bottom surface 121 for ejecting the arc out at one side and the other side, and the phases of the terminal portion 113 to be separated from the wire fastening portion 113. An external phase insulation device 130 is provided to protect the phase insulation from the insulation and arc of the wire connected to the circuit.

Here, in the terminal portion 113 and the lower frame 120, the guide groove 119 is in a straight line between each phase from the upper end of the terminal portion 113 to the bottom surface 121 of the lower frame 120. The first fixing hole 114 is formed in the terminal portion 113 of the upper end of the guide groove 119, and the lower frame 120 below the guide groove 119, respectively. The second fixing hole 125 is formed in the bottom surface 121. In addition, a protrusion wing portion 117 having a predetermined height is formed between the terminals of the terminal portion 113 as in the prior art.

As shown in FIGS. 3 and 5, the external inter-phase insulation device 130 includes an outer body portion 130 and an outer surface of the first fixing hole 114 at one side of the body portion 130. A protruding portion 131 protruding to be inserted and fixed, a fixing protrusion 135 protruding to be inserted into and fixed to the second fixing hole 125 at a lower end of the body 130, and protruding to an upper end of the body portion; It is formed is formed integrally with the position guide blades 133 to guide to the correct position when assembling the external phase insulation device 130.

The method of assembling the external inter-phase insulation device 130 having the above configuration is as follows.

First, the external phase insulator device 130 is interposed between the protruding wing parts 117 formed between the phases of the terminal part 113 to guide the position guide vanes 133 of the external phase insulator device 130. To be assembled in the correct position.

Next, the protrusion 131 of the external phase insulator device 130 is completely inserted into the first fixing hole 114 of the terminal part 113, and then the fixing protrusion 135 of the external phase insulator device 130 is formed. ) Is pulled downward to be inserted into the second fixing hole 125 formed in the bottom surface 121 of the lower frame, thereby completing the assembly as shown in FIG. 4. In this case, the external phase insulator device 130 is assembled to the terminal part 113, and one side edge surface of the external phase insulator device 130 is fitted to the guide groove 119 formed in the terminal part 113. .

On the other hand, the external phase insulator device 130 assembled to the terminal portion 113 can be attached and detached from the terminal portion 113 by the operation opposite to the above.

Reference numeral 111, which is not described above, is an input blocking handle 111 provided at the upper end of the main body 110.

Therefore, the external inter-phase insulation device 30 of the present invention is formed from the upper end of the terminal portion 113 to the bottom surface 121 of the lower frame 120, as shown in Figure 3 to 5 between each phase Since the wire fastening portion 115 and the exhaust hole 123 through which the arc is discharged can be isolated, it is possible not only to prevent foreign matter from entering the wire fastening portion 115 but also to the wire fastening portion 115. It is possible to insulate the phases of connected wires and to prevent short circuits that may occur at the wire part during maintenance work.

In addition, since the external inter-phase insulation device 30 can isolate the phase between the wire fastening portion 115 and the arc ejection portion of the wiring breaker at the same time, to protect the phase-to-phase insulation from the arc generated when the accident current is interrupted. Can be.

The present invention is not limited to the above-described embodiments, but can be variously modified and changed by those skilled in the art, which should be regarded as included in the spirit and scope of the present invention as defined in the appended claims. will be.

As described above, according to the circuit breaker for motor protection according to the present invention, an external phase insulation device capable of simultaneously separating the phases between the wire fastening portion and the arc ejection portion of the wiring breaker is configured to be detachable from the terminal portion of the wiring breaker. In addition, there is an effect that can prevent the secondary accident caused by the insulation of the wire and the arc.

In addition, since the external interphase insulation device further includes a position guide vane, the external phase insulator is guided to be assembled at the correct position when assembling to the terminal of the circuit breaker, and after assembly, there is an effect of preventing flow and departure. .

In addition, since it is assembled so as to be detachable from the terminal portion of the wiring breaker, the external phase insulation device which can insulate the phase between the wire fastening portion and the arc ejection portion of the wiring breaker at the same time is integrally formed, so that the insulation of the wire and the arc There is no need for an additional safety device to prevent secondary accidents.

Claims (2)

A main body having a handle driving device for closing and closing, a terminal part having a wire fastening part detachably installed at one side and the other side of the main body and fastening an electric wire, coupled to the lower end of the main body and the terminal, In the circuit breaker for protecting a motor, comprising a lower frame having an exhaust hole for ejecting arc on the other side, and an external phase insulator device that isolates and protects each phase between the terminals. The terminal portion and the lower frame is: A guide groove formed in a straight line between each phase from an upper end portion of the terminal portion to a bottom surface of the lower frame, a first fixing hole formed in an upper end portion of the guide groove, and a bottom surface of the lower frame below the guide groove; And a second fixing hole formed in the; The external phase insulation device unit: A body portion forming an outer shape, a protrusion formed to protrude and inserted into the first fixing hole at one side of the body portion, and a fixing protrusion protruded to be inserted into and fixed to the second fixing hole at the bottom of the body portion; Motor circuit breaker for wiring. The apparatus of claim 1, wherein the external interphase insulating device portion is: The circuit breaker for protecting the motor further comprising a position guide vane protruding from an upper end of the body to guide to an accurate position when assembling the external phase insulation device.

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