JPH0237236Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides a surge absorber unit with an operation indicator light, especially a surge absorber unit that is installed in an electromagnetic switchgear, absorbs surges in the electric circuit, and is equipped with an operation indicator light that indicates the operating status of the electromagnetic switchgear. This relates to a surge absorber unit.

Opening and closing control of electric circuits such as electric motors is performed by driving the contacts of an electromagnetic switching device such as an electromagnetic contactor or an electromagnetic relay. Normally, the opening and closing of the contacts is driven by a fixed iron core fixed to the main body of the electromagnetic switching device. An excitation voltage is applied to the attached operating coil, and the movable iron core is driven toward and away from the fixed iron core as the fixed iron core is excited or demagnetized, and in conjunction with this driving toward and away from the fixed iron core, opening and closing control of electrical circuit contacts such as electric motors is performed. I was worried.

Usually, in this type of device, as shown in FIG. 1, a surge absorption circuit 10 consisting of a varistor or a CR circuit is provided to absorb surges from the outside or surges generated in the operating coil etc. when the contacts are connected or separated. It is connected in parallel to the operating coil 12 to protect the device circuit.

Furthermore, in the conventional electromagnetic switchgear, as shown in FIG.
4 is provided. This operation display circuit 14 includes a light emitting element 16 consisting of a neon tube or a light emitting diode.
The operating state of the electromagnetic switching device is detected by the lighting effect of the light emitting element 16.

In other words, electromagnetic switchgear is generally installed inside a dimly lit switchboard in a factory, and for this reason, it is extremely difficult to detect its operating status when inspecting the electromagnetic switchgear. Therefore, the light emitting element 1 is connected in parallel to the operating coil 12.
6 is connected, and when the operating coil is driven, that is, when the main circuit contacts are closed, the light emitting element 12 emits light, thereby detecting the operating state of the electromagnetic switching device.

In the conventional device, this light emitting element 16
When the light emitting diode is a light emitting diode, in order to prevent damage caused by surge voltage from the operating coil 12 of the light emitting element 16, the light emitting element 1 is connected as shown in FIG.
A compensating diode 18 was provided in parallel with 6.

However, in this type of device, the surge absorption circuit 1 is included in the electromagnetic switchgear as described above.
0 and the operation display circuit 14 are provided separately, which has the disadvantage that the circuit configuration is extremely complicated.
Furthermore, as described above, the operation display circuit 14 requires a compensation diode 18 to protect the light emitting element 16, which increases the number of parts, increases the size of the device, complicates device manufacturing, and increases device cost. The drawback was that it led to soaring prices.

In addition, in the conventional device, as shown in FIG. 2, even if the operating coil 12 is disconnected and damaged as a result of the parallel connection of the operating coil 12 and the operation display circuit 14 and the main circuit contacts are opened, this As long as the excitation voltage is applied to the operating coil 12, the lighting effect of the light emitting element 16 continues, and the operating state of the electromagnetic switching device is detected.

In addition, various proposals for absorbing surges have been made in the past, such as Utility Model Application Publication No. 47-15161 and Utility Model Publication No. 52
Various proposals related to No.-17730 and Utility Model Publication No. 55-42411 are known.

The proposal of Utility Model Application Publication No. 47-15161 is to house the surge suppressor in a thin box-shaped container, stack this container on the bottom of the electromagnetic contactor, and fix it integrally using a common screw. It is characterized by making a reliable electrical connection. This provides the advantage that no special space is required for mounting the surge suppressor, and there is no need to use special screws for the mounting.

In addition, the proposal related to Utility Model Publication No. 52-17730 allows the installation of surge absorbers to at least two types of connectors with different installation dimensions using the same metal fittings, and allows the installation of surge absorbers to at least two types of connectors with different installation dimensions. The present invention relates to a coil surge absorber mounting device for an electromagnetic contactor that requires fewer types of parts and is extremely convenient in terms of parts management compared to the case where mounting fittings are prepared.

Furthermore, the proposal related to Utility Model Publication No. 55-42411 relates to a surge absorbing device that integrates a varistor element and a sensor terminal, and the replacement of the surge absorbing device is necessitated by the deterioration and destruction of the varistor element. The feature is that the work is easy.

In this way, each of the above-mentioned proposals merely provides a device that absorbs surges, but is not true in that they do not absorb surges in the device circuit and reliably display the operating status of the electromagnetic switchgear. This is clearly different from the invention.

The present invention was devised in view of the above-mentioned conventional problems, and its purpose is to achieve a simple circuit configuration.
It is an object of the present invention to provide a surge absorber unit with an operation indicator light that can absorb surges in a device circuit and can reliably indicate the operating status of an electromagnetic switchgear.

In order to achieve the above object, the present invention provides a unit body that is installed in an electromagnetic switching device that drives the main circuit contacts to open and close and absorbs surges in the electric circuit, wherein the unit body is an auxiliary unit that is linked to the opening and closing operations of the main circuit contacts. an operation indicator circuit having a contact and a light emitting element connected in series to the auxiliary contact and lit when the main circuit contact is closed; The device is characterized in that it includes a surge absorption circuit that absorbs surge voltage generated in the element.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 3 shows the circuit configuration of a surge absorber unit with an operation indicator light according to the present invention, and the same members as in the conventional device are given the same reference numerals and their explanations will be omitted.

The unique feature of this invention is that an auxiliary contact is provided that interlocks with the main circuit contact, and the light emitting element is lit based on the closing action of this auxiliary contact, and a surge absorption circuit is used to absorb surges in the operating coil. The structure is configured to absorb surge voltage and effectively protect the light emitting element from surge voltage.

In the unit body 100 of the device of this embodiment,
An operation display circuit 1 is connected in parallel to the operation coil 12.
4 and the surge absorption circuit 10 are connected.

The operation display circuit 14 is provided with an auxiliary contact 20 interlocked with the main circuit contact. This auxiliary contact 2
0 can be provided exclusively for driving the light emitting element 16, but when controlling the opening and closing of multiple electric circuits using an electromagnetic switching device, usually multiple electrical circuits are provided in conjunction with the crossbar of the electromagnetic switching device. By paying attention to the fact that an auxiliary contact unit including auxiliary contacts is installed, it is also possible to use some of the auxiliary contacts of this auxiliary contact unit as auxiliary contacts for driving light emission of the light emitting element 16.

A light emitting element 16 is connected in series to the auxiliary contact 20, and one end of this light emitting element 16 is connected to a resistor 2.
2 to the terminal of the operating coil 12.

Therefore, when the excitation voltage is applied to the operating coil 12, the main circuit contacts are closed, and in conjunction with this, the auxiliary contacts 20 are closed. As a result, a driving voltage is supplied to the light emitting element 16, and the desired light emitting action is performed.

In this way, in this embodiment, the auxiliary contact 20
Since the operation display circuit 14 consisting of a series connection body of a light-emitting element 16 and a light-emitting element 16 is connected in parallel with the operation coil 12, even if the operation coil 12 is disconnected and damaged while the excitation voltage is being applied to the operation coil 12, , the auxiliary contact 20 is reliably opened and the light emitting element 1
6 is turned off.

In addition, in this embodiment, a surge absorption circuit 10 is connected in parallel to the operation coil 12 and the operation display circuit 14.
As a result of this connection, the surge generated in the operating coil 12 is effectively absorbed by the surge absorption circuit 10, and the light emitting element 16 is protected from the surge voltage.

Further, in this embodiment, as shown in FIG. 4, the surge absorption circuit 10 and the light emitting element 16 are housed within the frame 24 of the auxiliary contact unit. As a result, the surge absorption circuit 10 and the light emitting element 16 are integrally formed as a unit within the frame 24. For example, the mounting piece 28 protruding from the frame 24 is locked to the electromagnetic switchgear main body. The work of attaching the body 24 to the electromagnetic switching device is facilitated, and the auxiliary contact 20 can be housed in the crossbar of the electromagnetic switching device and connected to an auxiliary crossbar for movement. Furthermore, in this embodiment, an additional auxiliary contact is built into the frame 24, so that it can also be used as an auxiliary contact unit. Furthermore, since the surge absorption circuit 10 and the light emitting element 16 are fixed within the frame 24, they can be effectively protected from external forces, and the light emitting element 16 can be effectively protected from external forces.
is located on the front surface, and sufficient light is emitted from the open surface light emitting section 200 of the frame body 24 to identify the operation.

Furthermore, in the device of this embodiment, as described above, the surge absorption circuit 10 absorbs not only the surge generated from the operation coil 12 but also the surge to the light emitting element 16. A compensating diode for protecting the light emitting element 16 from surge voltage is not required, and the device circuit can be simplified.

As explained above, according to the present invention, the unit body for absorbing surges in the device electrical circuit includes an operation display circuit and a surge absorption circuit connected in parallel to the operation coil, and the operation display circuit is connected to the main circuit contact. As a result of the structure including an interlocking auxiliary contact and a light-emitting element that is connected in series to the auxiliary contact and lights up when the main circuit contact is closed, the operating state of the electromagnetic switching device can be reliably illuminated and indicated by the light-emitting element. It is possible and
Furthermore, the surge absorption circuit can absorb surges generated in the operating coil, and furthermore, it is possible to effectively protect the light emitting element from surge voltage.

Furthermore, since the auxiliary contacts that have a direct on/off effect on the light-emitting element and the surge absorption circuit are arranged inside the unit, there is a margin for the contacts fixedly provided in the electromagnetic switchgear body in advance. Even if there is no such thing, it is possible to display the operation and perform the surge absorption function without being affected by this.

[Brief explanation of the drawing]

Fig. 1 is a circuit configuration diagram showing a surge absorber of a conventional electromagnetic switchgear, Fig. 2 is a circuit diagram of an operation display circuit that detects the operating state of a conventional electromagnetic switchgear, and Fig. 3 is a circuit diagram showing a surge absorber of a conventional electromagnetic switchgear.
The figure is a circuit configuration diagram of a surge absorber unit with an operation indicator light according to the present invention, and Fig. 4 is an external appearance of the frame housing the surge absorber circuit and light emitting element of the surge absorber unit with an operation indicator light according to the present invention. FIG. The same members in each figure are given the same reference numerals, 10 is a surge absorption circuit, 12 is an operating coil, 14 is an operation display circuit, 16 is a light emitting element, 20 is an auxiliary contact, 24
1 is a frame body, and 100 is a unit body.

Claims (1)

[Claims for Utility Model Registration] In a unit body for absorbing surges in an electric circuit, which is installed in an electromagnetic switching device that opens and closes main circuit contacts using an operation coil, the unit body includes an auxiliary unit that is linked to the opening and closing operations of the main circuit contacts. an operation display circuit having a contact and a light emitting element connected in series to the auxiliary contact and lit when the main circuit contact is closed; A surge absorber unit with an operation indicator light, comprising: a surge absorption circuit that absorbs a surge voltage generated in the surge absorber unit.