JPH0341398Y2 - - Google Patents

Description

[Detailed explanation of the idea] 〔Technical field〕 The present invention relates to an electromagnetic contactor.

[Background technology]

Generally, an electromagnetic contactor is used alone, but if you want to provide a separate spare contact, you will need a separate relay, and if you want to absorb surges, you will need to provide a surge absorption element. Conventionally,
When such separate components are provided, the circuit components are attached externally, so there is a problem that the space occupied by the components increases.

[Purpose of invention]

The present invention has been developed in view of the above points, and its main purpose is to incorporate circuit components into the casing of an electromagnetic contactor.
To provide an electromagnetic contactor capable of performing various operations without expanding the occupied space.

[Disclosure of invention]

(Example) Hereinafter, an example of the present invention will be described based on the drawings. As shown in FIG. 1, the casing 1 is composed of a box-shaped body 10 that is open upward, a frame 11 that is fitted over the top surface of the body 10, and a cover 12 that covers the top surface of the frame 11. . The body 10 and frame 11 are fixed with screws 13 at the four corners.
The frame 11 and cover 12 are connected by fixing screws 14.

Between the body 10 and the frame 11, there is a drive coil 20, a fixed iron core 21, a movable iron core 22, and a movable frame 2.
3. The return spring 24 and the like are housed. The drive coil 20 is wound around an axis in the vertical direction, and is open at the center. The fixed iron core 21 is formed into a substantially E-shape, and surrounds the lower part of the drive coil 20 with its central piece inserted through the drive coil 20 from below. The drive coil 20 and the fixed iron core 21 are fixed to the body 10. The movable iron core 22 is the fixed iron core 21
Similarly, it is formed into a substantially E-shape, and the central piece is inserted into the drive coil 20 to connect the drive coil 20.
surrounds the top of. A movable frame 23 is fixed to the upper surface of the movable iron core 22, and the movable iron core 22 and the movable frame 23 are integrated. An opening end of a return spring 24 formed in a substantially C-shape is locked in a locking groove 25 formed on the side surface of the movable frame 23 . The body of the return spring 24 is engaged with a support 30 fixed to the frame 11, and exerts a spring force to pull the movable iron core 22 and the movable frame 23 upward. A movable contact 26 is provided on the movable frame 23 and is disposed opposite to a fixed contact 27 fixed to the frame 11. When the drive coil 20 is not energized, the movable contact 26 and the fixed contact 27 are separated by the action of the return spring 24, and the drive coil 20 is energized and the movable iron core 22 is attracted to the fixed iron core 21 side. Then, the movable contact 26 and the fixed contact 27 are closed. An arc extinguishing device 28 is disposed on the frame 11 and extinguishes an arc generated between the movable contact 26 and the fixed contact 27. A coil terminal 40 connected to the drive coil 20 is provided on a terminal block portion 45 on the side surface of the body 10 , and a contact terminal 41 connected to the fixed contact 27 is provided on a terminal block portion 46 on the side surface of the frame 11 .
In addition to the coil terminal 40, the body 10 is provided with three dummy terminals 42 and 43 that are not connected to anything. Coil terminal 40 and dummy terminal 42,
A terminal piece 44 extends from each of the terminals 43 and 43, respectively.

By the way, as shown in FIGS. 2 and 3, a recess 50 that is open downward is formed at a position corresponding to the coil terminal 40 on the lower surface of the body 10, and the lower surface of the recess 50 is used for mounting. It is closed by a cover plate 52 which is removably connected with screws 51. A terminal piece 44 extending from the contact terminal 40 and the dummy terminals 42, 43 projects into the recess 50. As shown in FIG. 4, inside the recess 50, a printed wiring board 54 on which a circuit component 53 such as a relay is mounted is arranged to cover the opening surface of the recess 50.
The lower surface of the printed wiring board 54 is further covered with a cover plate 52. A lead wire 55 is drawn out from the printed wiring board 54, and a terminal receiver 56 is provided at the tip of the lead wire 55. Terminal holder 5
6 is capable of being detachably connected to a terminal piece 44 extending to the contact terminal 40 and the dummy terminals 42 and 43, and the terminal piece 44 and the terminal receiver 56 are connected to each other.
By combining the circuit components 53 on the printed wiring board 54 with the contact terminals 40 and the dummy terminals 4
2 and 43 are connected.

A specific example of incorporating the circuit component 53 into the printed wiring board 54 will be described below. In the following description, the contact terminal 40 will be described as A and B terminals, the dummy terminal 42 as D and E terminals, and the dummy terminal 43 as C terminal. FIG. 5 shows a basic method of use, in which the drive coil 20 is excited by applying an alternating current to the drive coil 20. At this time, only the A and B terminals are used, and it is sufficient to connect the alternating current power supply AC between the A and B terminals via the switch SW.

Next, a case will be described in which the drive coil 20 is driven by alternating current, and the connection between the drive coil 20 and the power source is controlled by direct current. In this case, as shown in FIG. 6, a relay Ry driven by direct current is used.
That is, as shown in Figure b, the relay Ry is mounted on a printed wiring board 54, and the lead wire 5 is connected to the coil terminal of the relay Ry and the relay contact r.
5 are drawn out respectively. The lead wire 55 corresponding to the coil terminal of the relay Ry is connected to the D and E terminals, and the lead wire 55 corresponding to the relay contact r is connected to the B and C terminals. Therefore, as shown in Figure 6a,
DC power supply via switch SW between D and E terminals
If DC is connected and AC power source AC is connected between the A and C terminals, when the switch SW is closed, the relay contact r is closed and the drive coil 20 is excited. A diode Di for surge absorption is connected in parallel to the coil of relay Ry.
Di is also mounted on the printed wiring board 54.

The embodiment shown in FIG. 7 shows an example in which the drive coil 20 is driven and controlled by direct current. That is, when driving the drive coil 20 with direct current, the magnetic force is increased at startup, and the magnetic force is decreased after startup to prevent burnout of the drive coil 20. 20 is provided with an intermediate tap t. However, relay
The drive coil of Ry is connected between terminals A and B, and the relay contact r is inserted between one end of the drive coil of relay Ry and the intermediate tap t of drive coil 20. Therefore, if you connect the DC power supply DC between the A and B terminals via the switch SW, the switch SW
Upon closing, a DC voltage is first applied to both ends of the drive coil 20 to excite the drive coil 20, and then the relay contact r is closed and the connection is made between the intermediate tap t of the drive coil 20 and one end of the drive coil 20. A DC voltage is applied to the magnetic field, thereby reducing the magnetic force. Lead wires 55 provided with terminal holders 56 corresponding to the A and B terminals are drawn out from the printed wiring board 54, and lead wires 57 connected to intermediate taps t without terminal holders 56 are drawn out. .

The embodiment shown in FIG. 8 is an example in which a preliminary contact is provided, and the drive coil of the relay Ry is connected to the drive coil 20.
are connected in parallel. That is, the drive coil of the relay Ry is connected between the A and B terminals, and the relay contact r is inserted between the D and E terminals. An alternating current power supply AC is connected to the A and B terminals via a switch SW, and when the switch SW is closed, the drive coil 20 is excited and at the same time the relay contact r
is closed, allowing relay contact r to act as a reserve contact. A relay Ry is arranged on the printed wiring board 54, and a relay A,
Lead wires 55 correspond to the B terminal and the D and E terminals.
is being brought out.

FIG. 9 shows an example in which a capacitor C, a resistor R, and a surge absorbing element Z are provided as circuit components 53 for surge absorption. The capacitor C and the resistor R are connected in series, and this series circuit and the surge absorbing element Z are connected in parallel. This parallel circuit is mounted on a printed wiring board 54 and inserted between terminals A and B using lead wires 55 drawn out from the printed wiring board 54. Therefore, the drive coil 20 and this parallel circuit are connected in parallel to absorb surges. An alternating current power source AC is connected to the A and B terminals via a switch SW, and the drive coil 20 is excited in response to closing of the switch SW.

In FIG. 10, delayed release is performed, and the control is performed using alternating current, and the excitation of the drive coil 20 is performed using direct current. That is,
A bridge circuit Br is connected between the D and E terminals, and the output end of the bridge circuit Br is connected to the A and B terminals. A parallel circuit of the drive coil of the relay Ry and the capacitor C is inserted between the A and B terminals, and a relay contact r is inserted between one end of the drive coil of the relay Ry and the intermediate tap t of the drive coil 20. be done. An alternating current power source AC is connected between the D and E terminals via a switch SW, and when the switch SW is closed, a direct current is applied to both ends of the drive coil 20, and the drive coil 20 is excited, as in the embodiment shown in FIG. Then, the relay contact r is closed and a direct current is applied between one end of the drive coil 20 and the intermediate tap t of the drive coil 20, so that the magnetic force of the drive coil 20 is reduced. When the switch SW is opened, the energy stored in the capacitor C causes the drive coil of the relay Ry and the drive coil 20 to
Since current flows for a while, the switch SW
The drive coil 20 returns to the non-excited state after a while after opening. That is,
They will be released on a delayed basis. Here, a relay Ry, a bridge circuit Br, and a capacitor C are mounted on the printed wiring board 54, and lead wires 55 and 57 are drawn out to terminals A, B, D, and E, and an intermediate tap t.

In addition to the above example, in Fig. 6, the switch
By using a monostable multi-wire instead of the SW, the drive coil 20 can be controlled by a digital signal. Even in such a configuration, by mounting the circuit component 53 on the printed wiring board 54, the circuit component 53 can be mounted on the body 10.
It is possible to store circuit components 5
Various circuits can be incorporated without increasing the space occupied by the third circuit.

[Effect of idea]

As mentioned above, in the present invention, a recess is formed at a position corresponding to the terminal block on the back side of the casing,
The terminal block has at least two terminals connected to the drive coil.
A predetermined circuit component is mounted on a printed wiring board which is provided with two terminals and arranged to close the opening of the recess, and the circuit component is housed in the recess. is drawn out,
A terminal piece is provided on one of the terminal and the tip of the lead wire, and a terminal holder that is detachably connected to the terminal piece is provided on the other. Since the terminals and circuit components are connected, by replacing the circuit components,
Magnetic contactors with various specifications can be configured, and since the circuit components are mounted on a printed wiring board and housed in a recess provided in the casing, the space occupied by the circuit components is reduced. It has the advantage of being small. Furthermore, since the circuit components and the terminals are connected by the terminal piece and the terminal holder, which are detachably connected, the circuit components can be easily replaced, and the circuit components have the advantage of being easy to assemble and repair. .

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention;
Figure 2 is a sectional view of the same as above, Figure 3 is a bottom view of the same as above,
Figure 4 is an exploded perspective view of the main parts of the same as above, Figure 5 is a circuit diagram showing a basic usage example of the same, Figures 6 to 1
0A and 0B are a circuit diagram and a perspective view of a printed wiring board corresponding to the circuit, respectively, showing an example of use of the same as above. 1 is a casing, 20 is a drive coil, 40, 4
2 and 43 are terminals, 44 is a terminal piece, 45 is a terminal block,
53 is a circuit component, 54 is a printed wiring board, 55 is a lead wire, and 56 is a terminal holder.

Claims (1)

[Scope of utility model registration request] A recess is formed on the back side of the casing at a position corresponding to the terminal block, and the terminal block is provided with at least two terminals connected to the drive coil, and the printing is arranged in a shape that closes the opening of the recess. A predetermined circuit component is mounted on the wiring board, the circuit component is housed in the recess, a lead wire is drawn out from the printed wiring board, and a terminal is attached to one of the terminals, the lead wire, and the tip. An electromagnetic contactor comprising a piece, one of which is provided with a terminal holder that is detachably coupled to the terminal piece, and the terminal and the circuit component are connected via the terminal piece and the terminal holder.