KR20210122444A - Magnetic Contactor for Forword and Reverse - Google Patents

Abstract

The present invention relates to a reversible-form electromagnetic contactor in which a magnetic contactor forward (MCF) for opening/closing a forward rotation circuit and a magnetic contactor reverse (MCR) for opening/closing a reverse rotation circuit allow a simultaneous input prevention device between each of the electromagnetic contactors to form an interlock that is electrically implemented by using each auxiliary contact point, and allows the MCF and the MCR to be fastened by a plurality of insulating conducting plates so that the main circuit wiring of each phase can be easily installed, wherein the MCF comprises a first maneuver terminal and a first connection terminal and the MCR comprises a second connection terminal 1 and a second maneuver terminal. Therefore, the present invention is capable of having an advantage of significantly reducing material and labor costs.

Description

Reversible Magnetic Contactor {Magnetic Contactor for Forward and Reverse}

The present invention relates to a reversible magnetic contactor used for forward/reverse operation or reverse-phase braking of a motor. Reversible that can be performed electrically using auxiliary contacts and can be safely switched from forward to reverse or from reverse to forward using each operation switch, simplifying the wiring circuit and switchgear configuration It is about a type magnetic contactor.

In addition, in order to change the rotational direction of the three-phase induction motor, the present invention provides a positive and negative power supply of three-phase input power of R, S, and T stages to U1, V1, and W1 stages of the forward and reverse rotation motors because it is enough to change the phases of two of the three phases. In case of reverse rotation with the rotary magnetic switch, connect a plurality of insulated conduction plates (SR, SS, ST) for main power supply so that R power is the same and S and T are connected in reverse order to form a magnetic switch for reverse rotation. To provide a reversible magnetic contactor configured to enable forward rotation and reverse rotation of a three-phase induction motor, respectively.

In general, the reversible type magnetic contactor is manufactured by molding a conductor so that the main circuit wiring of each phase of the electromagnetic contactor that connects a plurality of electromagnetic contactors side by side interlockingly between the electromagnetic contactors can be fastened to an electric wire or an electromagnetic contactor, and the distance between the conductors It is configured to include a spacer member that can be assembled by maintaining a constant.

In addition, the reversible magnetic contactor produced with a structure that can prevent a short circuit caused by disproportionately close phases and phases by being integrated with the separation distance between a plurality of conducting conductors maintained at a constant level is used for forward and reverse operation of the motor, reverse phase braking and It is manufactured and marketed as a product suitable for commercial, non-commercial, and conversion purposes.

However, in the prior art, there is no known technique that is implemented in a way to supply current in one direction by installing reversible magnetic contactors side by side, and to control the power connection internally to change the current direction of the magnetic contactor.

The present invention is to solve the above problems, and the power supply R, S, T of the magnetic contactor for forward rotation and the power supply R, S, T of the magnetic contactor for reverse rotation by two magnetic switches, which is a conventional wiring method, is connected to the lower end of the magnetic contactor in a busbar method. An object of the present invention is to provide a reversible magnetic contactor that is commonly supplied through an insulated conducting plate.

In addition, when using a common power supply by using an insulated current plate and other power supply members as the center of the magnetic contactor for forward and reverse operation, the power supply R, S, T of the magnetic contactor for forward rotation and reverse rotation is used. Since it is installed in the lower part, in order to prevent electromagnetic induction between each power source caused by narrowing the distance between the current-carrying part of the coil installed under the inside of the magnetic contactor and the main power supply line, the main power supply line and the coil are separated. Another object of the present invention is to provide a reversible magnetic contactor that is separated by an electromagnetic blocking plate.

In the reversible magnetic contactor according to the present invention, the MCF (Magnetic Contactor Forward) for opening and closing the forward rotation circuit and the MCR (Magnetic Contactor Reverse) for opening and closing the reverse rotation circuit respectively use the auxiliary contact to prevent simultaneous input between the magnetic contactors. In order to form an electrically implemented interlock and to easily install the main circuit wiring of each phase, the MCF and the MCR are fastened by a plurality of insulated conducting plates, and the MCF has a first start terminal and a first connection a terminal, wherein the MCR includes a second connection terminal 1 and a second start terminal, and the ST of the insulated conductive plate electrically connects the first connection terminal 1 of the MCF and the second connection terminal 2 of the MCR, and insulates The SS of the conducting plate electrically connects the first connecting terminal 2 of the MCF and the second connecting terminal 1 of the MCR, and the SR of the insulating conducting plate electrically connects the first connecting terminal 3 of the MCF and the second connecting terminal 3 of the MCR. Its technical feature is to selectively operate and control the rotation direction of the motor in the forward or reverse direction by connecting the two phases among the three phases according to the operation of the MCF and the MCR.

The reversible magnetic contactor according to the present invention is combined into one by supplying the supply power R, S, T of the main forward rotation magnetic contactor and the reverse rotation magnetic contactor to the lower end of the magnetic contactor through a busbar-type insulating conducting plate. It is easy to attach and detach the magnetic switch, and the number of power wiring terminals is reduced compared to existing products, and the number of power wiring wires is reduced. There are advantages.

1 is a schematic diagram of a reversible magnetic contactor according to the present invention;
2 is a pattern diagram of an insulating conductive plate according to the present invention;
3 is a circuit diagram of a reversible magnetic contactor according to the present invention;
4 is a pattern diagram of a reversible magnetic contactor according to the present invention;

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

In the present invention, as shown in FIG. 1, MCF (Magnetic Contactor Forward) 10 and MCR (Magnetic Contactor Reverse) 20 forming a mutually symmetrical structure are connected to the R, S, T lines of the main power supply 100. The power supplied through the is electrically connected by a plurality of insulated conducting plates 40 . (In the drawing, the upper frame and lower frame that maintain the overall shape are detached to show the internal structure)

In one embodiment of the present invention, the MCF 10 for the forward direction and the MCR 20 for the reverse direction include cross bars 11 and 21 installed in an inner space formed by an upper frame and a lower frame, respectively, and the cross bar 11 ) (21), the movable cores (12, 22) connected to the lower part, the fixed cores (14, 24) installed at a predetermined distance below the movable cores (12, 22), and the fixed core (14) The operating coils 13 and 23 installed on both ends of the 24, and back springs 15 and 25 installed inside the movable core 12 and 22, the crossbar 11 ( The movable contacts 17 and 27 are installed on the upper part of the 21 , and are configured to be in electrical contact with the fixed contacts 16 and 26 at the time of each coil excitation.

That is, in the reversible magnetic contactor according to the present invention, the MCF (Magnetic Contactor Forward) 10 for opening and closing the forward rotation circuit and the MCR (Magnetic Contactor Reverse) 20 for opening and closing the reverse rotation circuit prevent simultaneous input between the electromagnetic contactors, respectively. The MCF (10) and the MCR (20) have a plurality of insulated conductive plates ( 40) is a method of fastening.

The interlock refers to a circuit or component that prevents a malfunction in which two different devices operate at the same time, and when one of the two contacts operates, the contact is opened to block the operation of another device.

In addition, the MCF (10) is provided with first starting terminals (18a, 18b, 18c) and first connection terminals (19a, 19b, 19c), the MCR (20) is provided with second connection terminals 1 (28a, 28b) , 28c) and second start terminals (29a, 29b, 29c) are provided.

For reference, the first starting terminal includes a first starting terminal 1 (18a) / a first starting terminal 2 (18b) / a first starting terminal 3 (18c), the second starting terminal is a second starting terminal 1 (29a) ) / second starting terminal 2 (29b) / second starting terminal 3 (29c), and the first connection terminal is a first connection terminal 1 (19a) / first connection terminal 2 (19b) / first connection terminal 3 (19c), and the second connection terminal includes a second connection terminal 1 (28a/second connection terminal 2 (28b)/second connection terminal 3 (28c)).

On the other hand, as shown in FIG. 2 , the plurality of insulated conducting plates 40 connected to the MCF 10 and the MCR 20 are configured in a busbar type for power supply, and as an embodiment of the present invention, the main The ST terminal 40a connected to 'T' of the power supply 100, the first terminal 41a connected to the MCR 20, and the second terminal 42a connected to the MCF 10; an SS terminal 40b connected to 'S' of the main power supply 100, a first terminal 41b connected to the MCR 20, and a second terminal 42b connected to the MCF 10; It includes an SR terminal 40c connected to 'R' of the main power supply 100 , a first terminal 41c connected to the MCR 20 , and a second terminal 42c connected to the MCF 10 .

Accordingly, the ST 40a of the insulating conducting plate 40 electrically connects the first connecting terminal 1 19a of the MCF 10 and the second connecting terminal 2 28b of the MCR 20 to the insulating conducting plate SS (40b) of (40) electrically connects the first connection terminal 2 (19b) of the MCF (10) and the second connection terminal 1 (28a) of the MCR (20), and the SR of the insulating conducting plate (40) (40c) electrically connects the first connection terminal 3 (19c) of the MCF (10) and the second connection terminal 3 (28c) of the MCR (20), according to the operation of the MCF (10) and the MCR (20) Phase 2 of the 3 phases is changed, and the rotation direction of the motor is selectively controlled to be forward or reverse.

In particular, the insulating conductive plate 40 has a bent portion 43a so as to be bent at the predetermined angle at the connection portion between the first connection terminals 19a, 19b, 19c and the second connection terminals 1 28a, 28b, 28c. (43b) and (43c) may be provided.

thus. When power is applied to the working coil of the MCF 10 , the backspring 15 is compressed while the movable core 12 comes into contact with the fixed core 14 by the suction force generated from the coil. At this time, as the crossbar 11 connected to the movable core 12 moves downward together, the movable contact 17 comes into contact with the fixed contact 16, so that power flows in the forward direction.

Conversely, when the power of the working coil is cut off, the suction force of the coil disappears and the backspring 15 expands and the movable core 12 moves upward. Accordingly, the movable contact 17 is separated from the fixed contact 16 .

At this time, when power is applied to the working coil of the MCF 20 , the movable core 22 comes into contact with the fixed core 24 by the suction force generated from the coil, and the backspring 25 is compressed. At this time, as the crossbar 21 connected to the movable core 22 moves downward together, the movable contact 27 comes into contact with the fixed contact 26 , and power flows in the reverse direction.

In another embodiment of the present invention, an electrical connection between the first starting terminals 18a, 18b, 18c of the MCF 10 and the second starting terminals 29a, 29b, and 29c of the MCR 20 is established, respectively. 1 starting terminal 1 (18a) and the second starting terminal 1 (29a), the first starting terminal 2 (18b) and the second starting terminal 2 (29b), the first starting terminal 3 (18c) and the second starting terminal 3 ( 29c) to produce a product, there will be significant advantages in constructing an electromagnetic contactor.

On the other hand, the supply power of the electromagnetic contactor according to the present invention is inevitably electronic because it is preferable to install it through the lower end of the electromagnetic contactor when using a common power supply using a plurality of insulated conductive plates 40 and other power supply lines. When the coil installed under the inside of the contactor is energized, the distance between the coil and the main power supply line is inevitably narrowed, so a problem may occur due to electromagnetic induction between each power source.

In the present invention, as shown in FIG. 4 to prevent this, an electromagnetic shielding plate 60 is installed between the coils provided in the MCF 10 and the MCR 20 and the load 30, so that the electromagnetic induction phenomenon It is desirable to prevent

In one embodiment of the present invention, the electromagnetic shielding plate 60 is made of a lead material, and in addition, an alternative or another member capable of shielding electrons and magnetism may be used, and between the lower end of the electromagnetic contactor and the coil. A lead plate is installed in the center, and it is installed based on the direction in which the main power passes through the center.

The reversible magnetic switch of the present invention configured as described above is operated in a connected state as shown in the equivalent circuit diagram of FIG. 3 and the pattern diagram of FIG. 4 , so that the forward and reverse power supply can be easily switched.

Therefore, in the reversible magnetic contactor according to the present invention, the supply power R, S, T of the main magnetic contactor for forward rotation and the magnetic contactor for reverse rotation are commonly supplied to the lower end of the electromagnetic contactor through a busbar-type insulating conducting plate 40. By doing so, the wiring work is easy, and it is easy to attach and detach the magnetic switch by combining it into one.

In addition, the number of terminals of the power wiring is reduced and the size of the distribution box is reduced by the application of the insulated conductive plate 40 , resulting in economic savings.

10: MCF (Magnetic Contactor Forward)
20: MCR (Magnetic Contactor Reverse)
11, 21: crossbar 12, 22: movable core
13, 23: action coil 14, 24: fixed core
15, 25: Backspring 16, 26: Fixed contact
17, 27: movable contact 18a, 18b, 18c: first starting terminal
19a, 19b, 19c: first connection terminal 28a, 28b, 28c: second connection terminal
29a, 29b, 29c: second starting terminal
30: Load (FR; Forward Reverse) 40: Insulated conductive plate
40a: ST terminal 40b: SS terminal
40c: SR terminal 41a, 41b, 42c: first terminal
42a, 42b, 42c: second terminal 43a, 43b, 43c: bent part
60: electromagnetic shielding plate 100: main power

Claims (5)

The MCF (Magnetic Contactor Forward) 10 for opening and closing the forward circuit and the MCR (Magnetic Contactor Reverse) 20 for opening and closing the reverse circuit electrically implement the simultaneous closing prevention device between the magnetic contactors using each auxiliary contact. The MCF (10) and the MCR (20) are fastened by a plurality of insulating conducting plates (40) to form an interlock (Interlock) and to easily install the main circuit wiring of each phase, but the MCF (10) includes first starting terminals 18a, 18b, 18c and first connection terminals 19a, 19b, 19c, and the MCR 20 has second connection terminals 1 28a, 28b, 28c and a second starting terminal. Terminals 29a, 29b, 29c are included,
The ST 40a of the insulating conducting plate 40 electrically connects the first connecting terminal 1 19a of the MCF 10 and the second connecting terminal 2 28b of the MCR 20 to the insulating conducting plate ( The SS 40b of 40 electrically connects the first connection terminal 2 19b of the MCF 10 and the second connection terminal 1 28a of the MCR 20, and the SR ( 40c) electrically connects the first connection terminal 3 (19c) of the MCF (10) and the second connection terminal 3 (28c) of the MCR (20), depending on the operation of the MCF (10) and the MCR (20) 3 A reversible magnetic contactor, characterized in that the phase of two of the phases is changed, and the rotation direction of the motor is selectively operated and controlled in the forward or reverse direction.
The method of claim 1,
The first starting terminals 18a, 18b, and 18c of the MCF 10 and the second starting terminals 29a, 29b, and 29c of the MCR 20 are respectively a first starting terminal 18a and a second starting terminal. 1 (29a), the first starting terminal (18b) and the second starting terminal 2 (29b), the first starting terminal 3 (18c) and the second starting terminal 3 (29c) characterized in that it is configured by electrically connecting Reversible magnetic contactor.
The method of claim 1,
A reversible magnetic contactor, characterized in that the plurality of insulated conducting plates 40 connected to the MCF (10) and the MCR (20) are configured in a busbar type for power supply.
The method of claim 1,
The insulating conductive plate 40 has bent portions 43a, 43b so as to be bent at the predetermined angle at the connection portions between the first connection terminals 19a, 19b, and 19c and the second connection terminals 28a, 28b, and 28c. ) (43c) Reversible electromagnetic contactor, characterized in that provided.
The method of claim 1,
Reversible, characterized in that the electromagnetic shielding plate 60 is provided between the operating coils 13 and 23 of the MCF 10 and the MCR 20 and each insulating conducting plate 40 to prevent electromagnetic induction. type magnetic contactor.

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