JPH0130768Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement in the electromagnetic structure of an electromagnetic contactor equipped with an electromagnetic drive device for controlling an alternating current voltage.

Conventionally, the electromagnet of this type of electromagnetic contactor has been coated with epoxy resin or the like to protect the operating coil and its control parts from the impact of the contactor body, and a fixed iron core that passes through the operating coil. must be constructed so as not to come into contact with the epoxy resin so that the input impact will not propagate to the operating coil and each control component. On the other hand, the operating coil and each control component are designed to improve assembly workability.
Must be placed on a flat surface. However, if an E-shaped or U-shaped fixed core is used in the above configuration, the fixed core passes through the placement surface of each of the above components, reducing the installation area for each component. There was a problem that it became difficult.

This idea solves the above problems,
An electromagnetic contactor equipped with an electromagnet with a large component mounting plane by sandwiching and fixing a rod-shaped fixed iron core with a roughly trapezoidal cross section between a base that forms the outer frame of the main body and a box-shaped mounting base. This is what we are trying to provide.

An embodiment of this invention is shown below in Figures 1 to 6.
This will be explained using figures.

First, the electromagnet circuit will be explained with reference to FIG. 1. The circuit components are composed of a varistor 1, a changeover switch 2, a resistor 3, a capacitor 4, a diode 5, and an operating coil 6. The changeover switch 2 is closed when the main contact of the electromagnetic contactor 7 (FIG. 2) is open, and is open when the main contact is closed. The capacitor 4 and the resistor 3 are connected in series and in parallel to the changeover switch 2. The diode 5 performs full-wave rectification of the alternating current voltage AC, and the operating coil 6 is connected to its direct current output end. The varistor 1 is connected to the alternating current side to prevent invasion of external surges.

In the above configuration, when an AC voltage is applied,
Initially, the changeover switch 2 is closed, so the full voltage of full-wave rectification of the AC voltage is applied to the operating coil 6, and the movable part of the electromagnetic contactor 7 is driven by electromagnetic force, causing the main contact to close. At the same time as the circuit is closed, the changeover switch 2 is opened. When the changeover switch 2 is opened, an alternating current voltage is applied to the diode 5 via the capacitor 4. Since the AC voltage dropped by the capacitor 4 is applied to the operating coil 6, the movable part is held by a weaker electromagnetic force than when it is turned on, and the power consumption of the operating coil 6 becomes small. In the case of electromagnets that apply AC voltage directly to the operating coil, the magnetomotive force and power consumption of the operating coil change due to changes in reactance during turning on and holding.
In the case of DC excitation, as mentioned above, it is necessary to change the voltage applied to the operating coil using a changeover switch or the like.

Next, when the AC voltage is erased, the movable part returns to its original state and at the same time the changeover switch 2 closes.
The electric charge remaining in the capacitor 4 is discharged to the changeover switch 2 through the resistor 3, and the electrical insulation generated on the contact surface of the changeover switch 2 is electrically removed. Note that the resistor 3 limits the value of the discharge current so that the contacts do not weld.

Next, the configuration will be explained with reference to FIGS. 2 to 6.

The main contact is composed of a movable contact 8 and a fixed contact 9, and the movable contact 8 is held by a crossbar 11 while being pressed by a pressure spring 10. The cross bar 11 has a U-shaped movable core 12 that forms a magnetic path.
are connected by pins 13 and are slidably incorporated into a base 14. A rod-shaped fixed core 15 having a trapezoidal cross section is provided facing the movable core 12, and fixed core receivers 16 inserted into both ends of the core are fixed with screws 17.
It is clamped and fixed between the base 14 and the mounting base 18 which are fixed together. A fixed buffer rubber 19 is provided at the bottom of the mounting base 18 to press the fixed iron core 15.

The operating coil 6 has a coil spool 21 and a winding 2.
2. Consists of coil lead 23, winding 22
are twisted around a coil spool 21 and then connected to a protrusion 25 of a conductive coil lead 23 through a groove 24 provided in the coil spool 21.
The groove 24 is provided in the collar 26 of the coil spool 21 below the fixed core 15 so as not to interfere with the movable core 12. A protrusion 27 is formed on the coil lead 23, which is inserted and fixed into a hole 28 provided in the coil spool 21, and a terminal protrusion 29 is formed on the coil lead 23.
is made to protrude toward the base side along the flange 26 so that it can be used as a winding resistance measuring terminal of the operating coil 6.

The operating coil 6 configured as described above is connected to the printed circuit board 30 by the protrusion 27 of the coil lead 23 and is disposed so as to penetrate the fixed iron core 15. The printed circuit board 30 includes
In addition to the above-mentioned operating coil 6, there are mounted a varistor 1, a changeover switch 2, a resistor 3, a capacitor 4, a diode 5, and a coil terminal 31 for applying an alternating current voltage, which are parts used to control the operating coil 6. be. This printed circuit board assembly 32 is assembled inside the box-shaped mounting base 18, and
The changeover switch 2 is provided with a female thread 33 (FIG. 4) and is fastened to the mounting base 18 with a screw 34 via a printed circuit board 30 to regulate the position of the changeover switch 2.

Further, a protrusion 35 is provided on both sides of the collar 26 of the coil spool 21, and the protrusion 35 has a notch 3.
6 and formed on the mounting base 18 with an internal thread 37
(FIG. 4) is fastened with screws 38 to fix the heavy operating coil 6 to the mounting base 18. The coil terminal 31 is a relay terminal 3 that is press-fitted into the mounting base 18.
9, they are fastened together with coil terminal screws 40 to enable connection of an external power source to the electromagnet.

In order to protect each component mounted on the printed circuit board assembly 32 fixed to the mounting base 18 from the impact of the electromagnetic contactor 7 itself, epoxy resin 41 is injected into the box-shaped mounting base 18. . In addition,
The present inventor has confirmed through experiments that the epoxy resin 41 does not leak from the mounting base 18 through which the screw 34 passes.

As explained above, this invention incorporates an operating coil of an electromagnetic contactor and a control component for controlling the operating coil into a box-shaped mounting base, and an electromagnet in which resin is injected into the inside of the mounting base to fix the control component; Because the configuration includes a bar-shaped fixed core with a substantially trapezoidal cross section that passes through the operating coil and is clamped and fixed between the base and the mounting base, it is possible to Secondly, the installation space for each of the control parts mentioned above is less limited by the windings and core, and there is ample space at both ends of the bar-shaped fixed core, so they can be easily stored and installed inside the mount. , the space factor is improved, the entire structure can be made compact, and resin injection is also facilitated, contributing to a reduction in manufacturing costs.

[Brief explanation of drawings]

1 to 6 are diagrams showing one embodiment of the present invention, FIG. 1 is a circuit diagram of an electromagnet of an electromagnetic contactor, and FIG. 2 is a plan view showing a partial cross section of the electromagnetic contactor. , FIG. 3 and FIG. 4 are sectional views taken along the - line and - line in FIG. 2, respectively, FIG. 5 is an exploded perspective view of the electromagnet part of the electromagnetic contactor, and FIG. This is a perspective view. 6... Operating coil, 7... Magnetic contactor, 8, 9
...Contact, 11...Cross bar, 14...Base, 15...Fixed core, 18...Mounting stand, 22...
...Winding, 41...Resin.

Claims (1)

[Scope of utility model registration request] A movable part consisting of a crossbar that supports a contact that switches on and off the current, and a substantially U-shaped movable iron core held by the crossbar, and a base into which the movable part is slidably installed in a straight line; It includes an operating coil for generating magnetic flux that drives the movable part, and an electromagnetic drive device for controlling an alternating current voltage applied to the operating coil, and a box-shaped mounting base for mounting the control part and the operating coil. an electromagnet that is assembled into the mount and injects resin into the inside of the mount to fix the control component; and a rod-shaped fixed core that passes through the operating coil and is clamped and fixed between the base and the mount. An electromagnetic contactor featuring: