JPS6355175B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an electromagnetic contactor that controls opening and closing of an electric circuit such as an electric motor.

A conventional device of this type is shown in FIG. In the figure, reference numeral 1 denotes a box-shaped mounting base made of an insulating material, which is provided with a plurality of mounting holes 1a for mounting the electromagnetic contactor main body to a mounting board or the like. Reference numeral 2 denotes a base fixed to the mounting base 1 with a tightening screw 3, and is made of an insulating material. 4 is an E-shaped fixed core made of laminated silicon steel plates, 5 is a buffer spring inserted between the fixed core 4 and the mounting base 1, and 6 is the E of the fixed core 4.
The operating coil is mounted on the central leg, and is held with its lower surface in contact with the fixed iron core 4 and its upper surface in contact with the base 2, respectively. 7 is the operating coil 6
A lead wire 9 connecting the coil terminal 8 and the fixed iron core 4 is a direct-acting movable iron core that is disposed facing the fixed iron core 4 with a predetermined gap therebetween. It is configured to be attracted to the fixed iron core 4. A cross bar 10 is made of an insulating material and is connected to the movable iron core 9 via a pin 11. Reference numeral 12 denotes a tripping spring disposed between the cross bar 10 and the mounting base 1, which acts to bias the cross bar 10 upward in the figure. 13 is a movable contactor equipped with a movable contact point 14, which is inserted into a holding hole 10a provided in the crossbar 10,
It is pressurized by a contact spring 16 held by a spring support 15. A fixed contact 17 includes a fixed contact 18 facing the movable contact 14, which is fixed to the base 2 by its elasticity and has a terminal screw 19 for connection to the main circuit electric wire. Reference numeral 20 denotes an arc runner made of magnetic metal and provided for arc extinguishing, and is fixed to the base 2 by a spring action.

Because of the above configuration, in the conventional electromagnetic contactor, when a driving voltage is applied to the operating coil 6, an electromagnetic attraction force is generated between the fixed iron core 4 and the movable iron core 9 due to the magnetic flux generated by the operating coil 6. occurs,
The movable core 9 is attracted to the fixed core 4 against the tripping spring 12. Along with this, the cross bar 10 connected to the movable core 9 moves toward the fixed core 4 and is held by the cross bar 10, so that the movable contact 14 of the movable contact 13 comes into contact with the fixed contact 18 of the fixed contact 17. At this time, the contact gap between the movable contact 14 and the fixed contact 18 is
Since the core gap between the two is larger, when the core is closed, the crossbar 10 moves further toward the fixed core 4 than the contact position of the contact. Therefore, the contact spring 16 is compressed and deformed, and this spring pressure is transmitted to the movable contact 13 to obtain a predetermined contact pressure and close the contacts.

However, when the drive voltage applied to the operating coil 6 is removed, the electromagnetic attractive force between the fixed core 4 and the movable core 9 disappears, and the crossbar 10 rebounds due to the spring biasing force of the compressed tripping spring 12. It is moved to the fixed core side and the contacts are separated. At this time, an arc is generated between the movable contact 14 and the fixed iron core 18, but this arc is extended onto the arc runner 20 adjacent to the contact portion, cooled and divided, and extinguished.

By the way, since the driving voltage of the electromagnetic contactor is alternating current, in order to prevent the vibration of the iron core due to the alternating magnetic flux, a magnetic contactor coil 21 is arranged on the armature surface of the iron core to smooth out the pulsating attraction force caused by the alternating magnetic flux. Ta. However, there is a limit to the effectiveness of the coumatri air 21, and for example, when the iron core armature surface becomes rusted, the smoothing effect is reduced and the core vibrates, causing external noise. For this reason, it has been proposed that the mount has a built-in rectifier circuit to convert the alternating current voltage applied to the operating coil into direct current.

However, as the fixed core 4, buffer spring 5, operating coil 6, etc. are all built into the mounting base as shown in Figure 1, it has been difficult to secure sufficient space for installing the rectifier circuit. .

In view of the above points, the present invention connects a rectifier circuit within a printed circuit board, mounts the above-mentioned operating coil on this printed circuit board, and makes a fixed iron core passing through this operating coil from a bar-shaped magnetic material having a trapezoidal cross-section. In addition, the movable core is formed into a U-shape, and the U-shaped recess of the movable core is configured as a housing space on one side of the operating coil, and both ends of the movable core that straddle the operating coil are By arranging the rectifier circuits and their auxiliary devices so as to face each other on both ends of one side of the rod-shaped magnetic material, it is possible to improve the ease of assembly and handling of the rectifier circuit and its auxiliary devices.

The present invention will be described below with reference to the embodiments shown in FIGS. 2 to 9. In the figure, 22 is a box-shaped mounting base made of thermoplastic resin, 23 is a printed circuit board with a plurality of mounting holes 33a,
On this board, electronic components 24, an operating coil 25, and a change-over contact switch 26, which will be described in detail later, are mounted, and these are attached to a headed pin 27 that corresponds to the mounting hole 23a inside the mounting base 22.
and a seat 22a, and the cast material 2
8.

FIG. 3 shows the electronic components 24 and the operating coil 25.
and the printed circuit board 2 of the changeover b contact switch 26
3, 24a is a varistor, 24b is a capacitor, 24c is a resistor, 24
d is a diode.

As shown in FIG. 5, the operating coil 25 has a pair of coil leads 30 inserted into its coil spool 29, and has a coil winding start 25a and a winding end 25b.
is wound around the pin portion 30a of the coil lead 30 and connected by soldering, and the other pin portion 30b of the coil lead 30 is configured to be directly attached to the printed circuit board 23 and soldered.

As shown in FIG. 2, the changeover b contact switch 26 has a push button part 26a on its upper part, and when this push button part 26a is pressed against the lower end of the cross bar 31, its contact opens just before the core adsorption position. As shown in FIG.
3 by direct soldering. In order to ensure the accuracy of the switching position of the contact, the changeover b contact switch 26 is attached to the mounting base 22 via the printed circuit board 23 with a tightening screw 3 as shown in FIG.
It is fixed by 2. 33 is a coil terminal plate made of a conductive plate, and a pin portion 33a formed at the lower part is soldered to a printed circuit board, and the upper part 33 is soldered to a printed circuit board.
3b is fixed to the coil terminal 34 with a coil terminal screw.

35 is a fixed core made of a rod-shaped magnetic material with a trapezoidal cross-section, and on its contact surface, as shown in FIG. 9, a non-magnetic spacer 36 made of a non-magnetic metal plate is provided to prevent a delay in falling of the core. It is pasted together to This fixed core 35 is attached to the mounting base 22
The operating coil 25 is inserted through the opening 22b on the side surface of the opening 22b, and the opening is closed by a lid member 37.
38 is a fixed core support made of a material with a small Young's modulus (for example, thermoplastic resin, etc.), and the claw portion 38
It is fixed to the base 39 by the snap action of a, and the lower end surface 38b is formed by the curved surface of the base 39.
is brought into contact with the armature surface of the fixed iron core 35 to position the fixed iron core 35. Therefore, since the fixed core 35 can rotate in the direction of the arrow A shown in FIG. 2, it can be rotated in the direction of the arrow A shown in FIG. In the iron core adsorption state, it is possible to make close contact.
The suction force characteristics can be stabilized. 41 is a fixed buffer rubber provided between the fixed iron core 35 and the mounting base 22, and 42 is a leaf spring for connecting the movable iron core 40 and the cross bar 31, which is made of a spring metal plate. 43 is a tripping spring receiver, and its protrusion 4
3a (see FIG. 8) is fitted and fixed in a dovetail groove 22b provided on the mounting base 22, and a tripping spring 44 is compressed and disposed between the spring receiver 43 and the lower surface of the cross bar 31. The cross bar 31 is always urged upward. Reference numeral 45 denotes an arc extinguishing arc cover made of a heat-resistant insulating material, and inside the cover, a grid A48 made of a magnetic metal plate and a grid A 48 are placed close to the arc generated between the movable contact 46 and the fixed contact 47. B49 is arranged for each pole.

In the electromagnetic contactor of this embodiment configured as described above, when a driving voltage is applied with the iron core open, the contact of the changeover b contact switch 26 is closed as shown in FIG. The full-wave rectified voltage is applied to the operating coil 25, and the magnetic flux generated by the operating coil 25 causes the fixed iron core 3 to
5 and the movable core 40, and the movable core 40 is attracted to the fixed core 35 against the tripping spring 44. At that time, the contact of the changeover b contact switch 26 is in the open state as described above, so
A capacitor 24b and a resistor 24c are connected in series, and a divided DC voltage is applied to the operating coil 25 to maintain the adsorption state of the iron core. This is because the electromagnetic energy during suction may be smaller than the electromagnetic energy during suction. Therefore, the switching operation of the changeover b-contact switch 26 in the above embodiment reduces power consumption and, as a result, suppresses the temperature rise in each part to a low level, resulting in an improvement in the life of the device.

Further, the electromagnetic contactor of this embodiment has a fixed iron core 35
is made of a rod-shaped magnetic material, and a movable core 40 is formed in a U-shape to face the side surface of the movable core 40, and when these cores are attracted, the movable core side portion of the coil 25 is housed in the recessed portion of the movable core 40. Therefore, a sufficient mounting space for the rectifier circuit can be secured within the mounting base 22.

Furthermore, since the fixed core 35 is placed horizontally during assembly, and the fixed core support 38 for positioning the fixed core 35 is formed in a gate shape,
The fixed core 35 can be inserted and removed through the gate-shaped inner space of the fixed core support 38 after the electromagnetic switch is assembled. At this time, since the fixed core 35 has a trapezoidal cross-sectional shape, its armature surface and lower surface can be easily distinguished.

In addition, in the electromagnetic contactor of this embodiment, the rectifier circuit of the operating coil 25 shown in FIG.
3, no electric wire wiring is used, and the operation coil 25 and changeover b contact switch 2
6 can be directly attached to a printed circuit board, and their positions and heights can be easily set using the headed pin 27 and the seat 22a, so that assembly efficiency is significantly improved and the entire device is made inexpensive.

Furthermore, the electromagnetic contactor of this embodiment has electronic components 24a, 24b, 24c, and 24d in FIG.
The constants of the winding specifications of the operating coil 25 and the winding specifications of the operating coil 25 change as the driving voltage changes, but since these are all fixed in the mounting base 22 by the molded material 28, even if the driving voltage differs, When the user modifies the device, there is no need to make a mistake in the combination of the electronic components and the operating coil 25, and the modification work can be done using the mounting base 2.
This can be done very easily since it is only necessary to replace 2.

Furthermore, the electromagnetic contactor of this embodiment has the effect that operation stability can be obtained because the changeover b contact switch 26 is fixed to the mounting base 22 with a tightening screw 32 and the switching position is accurate.

In the above embodiment, the printed circuit board 23 is attached to the mounting base 22 using the head pin 27 and the seat 22a, and fixed with the molded material 28, but this is shown in FIGS. 10 and 11. As shown in FIG. It may be fixed by utilizing the flexure of 23.

As described above, according to the present invention, there is provided a mounting base with a built-in rectifier circuit, a fixed core provided on the mounting base and around which an operating coil is wound, and a driver disposed facing the fixed core with a predetermined gap therebetween. In an electromagnetic contactor that is equipped with a direct-acting movable core that is always biased toward the opposite side of the fixed core by a release spring, and that converts the AC voltage applied to the operating coil into DC, the rectifier circuit is installed within the printed circuit board. In addition to connecting the wires, the operating coil is mounted on the printed circuit board, the fixed core passing through the operating coil is made of a rod-shaped magnetic material having a trapezoidal cross-section, and the movable core is formed into a U-shape. The U-shaped recess of the movable iron core is formed in a housing space on one side of the operating coil, and both ends of the movable iron core that straddles the operating coil are respectively opposed to both ends of the one side of the rod-shaped magnetic material. By arranging the rectifier circuit and its auxiliary devices within the mounting base, it is possible to improve the ease of assembly and handling.

[Brief explanation of drawings]

Figures 1a, b, and c all show a conventional electromagnetic contactor, with half-sectional views of the plane, front, and side, respectively.
Figures 2a, b, and c all show one embodiment of the present invention, and are respectively half-sectional views of a plane, a front side, and a side view.
The figure is the operation coil rectifier circuit connection diagram of the one in Figure 2,
Fig. 4 is a perspective view of the operating coil rectifier circuit of Fig. 2, Fig. 5 is an enlarged perspective view showing the operating coil of Fig. 4 at a different angle, and Fig. 6 is the changeover b contact switch of Fig. 4. FIG. 7 is an enlarged perspective view showing the fixed core support of the one shown in FIG. 2, FIG. 8 is an exploded perspective view showing how the trip spring receiver of the one shown in FIG. 2 is attached to the mounting base, FIG. 9 is an enlarged perspective view showing the fixed iron core of the one shown in FIG. 2, FIG. FIG. 3 is a cross-sectional view of the mounting base. 1, 22... Mounting base, 4, 35... Fixed core,
6, 25... Operating coil, 9, 40... Moving iron core, 12, 44... Trip spring. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A mounting base with a built-in rectifier circuit, a fixed core provided on the mounting base and around which an operating coil is wound, and a tripping spring that is disposed facing the fixed core at a predetermined distance and constantly connected to the base. In an electromagnetic contactor comprising a direct-acting type movable core that is biased toward the opposite side of the fixed core, and converting the AC voltage applied to the operating coil to DC voltage,
The rectifying circuit is connected within a printed circuit board, the operating coil is mounted on the printed circuit board, the fixed iron core passing through the operating coil is made of a rod-shaped magnetic material having a trapezoidal cross-section, and the movable iron core is formed into a U-shape, and the U-shaped recess of the movable core is configured as a housing space on one side of the operating coil, and both ends of the movable core that straddles the operating coil are formed of the rod-shaped magnetic material. An electromagnetic contactor characterized by being arranged facing each other at both ends of one side. 2. The printed circuit board is positioned by providing projections at several locations on the mounting base and setting the distance between the projections to be narrower than the width of the printed circuit board. Magnetic contactor.