JPH0887940A - Electromagnetic contactor - Google Patents

Abstract

PURPOSE: To mount/demount a contact unit of arbitrary contact constitution without limiting a constituting number of normally closed contacts, by additionally setting up the second return spring in the contact unit. CONSTITUTION: An iron core unit 10 is constituted of a fixed core 1 stored in the first fixed insulating base 6a, electromagnetic coil 2 mounted to engage with this fixed core, movable core 3 provided in an upper insulating base 7 further to be connected to a movable insulating base 5a and a return spring 4a arranged between these core 3 and coil 2. A contact unit 13 comprises movable contacts 11a, 11b provided in a movable insulating base 5b fitted to a fixed insulating base 6b, fixed contacts 12a, 12b fixed to an upper insulating base 7b and a return spring 4b inserted between the insulating bases 6b, 5b. In accordance with a number of normally closed contacts, by selecting the spring 4b, return force against the movable core when opened a pole can be adjusted. The unit 10 and 13, by inserting a connection part, protruded from an upper insulating base 7a of the unit 10, and a connection part of the insulating base 6b of the unit 13, slide in a direction of arrow mark P, can be mounted by one touch operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an auxiliary electromagnetic contactor having a structure in which a movable part, which is composed of a movable iron core and a movable insulating base for supporting the movable contact, moves in the opening / closing direction of the movable contact. .

[0002]

2. Description of the Related Art The prior art is disclosed in JP-A-63-16518.
JP-A-1-65739 and JP-A 64-243.
No. 3, which is disclosed in each publication, an example of these is shown in FIG. In the figure, 1 is a fixed iron core around which a coil 2 is wound, 3 is a movable iron core, 4 is a return spring, 5 is a movable iron core 3, and the movable contacts 11a and 11b are supported to move in both the opening and closing directions. A movable insulating base 6 that can be provided is a fixed insulating base that houses the movable iron core 3, the movable insulating base 5, and the return spring 4. 7
Is an upper insulating base, which is fixed contact 1 using terminal screw 9.
2a and 12b are supported and fixed. Also, the upper insulation stand 7
Is the movable contact 11a on both sides of the fixed contacts 12a, 12b.
(Normally open contact) and 11b (normally closed contact) are mounted so as to be positioned. The fixed insulating base 6 and the upper insulating base 7 are coupled and fixed using screws 8. Therefore, in the electromagnetic contactor, when the movable iron core is attracted to the fixed iron core 1, the normally closed movable contact 11b of the movable insulating base 5 is opened and the normally opened movable contact 11 is opened.
a is closed. Reference numeral 14 is an auxiliary contact unit for head-on attachment.

[0003]

In the above-mentioned prior art, since the return spring 4 is housed in the iron core unit 10, the contact is closed → open regardless of the contact structure of the upper insulating base 7. Sometimes, a biasing force that pushes back the movable insulating table 5 in the opening direction is necessary. However, in the case of a contact structure that requires a large number of normally closed contacts, the contact pressure of the contact acts as a resistance force in a direction opposite to the urging force of the return spring 4, and thus the return spring having an appropriate urging force is provided. If it is not replaced with 4, the contact opening operation will be hindered, and therefore the number of normally closed contacts will be limited.
There was a problem that the iron core unit 10 of the electromagnetic contactor had to be replaced.

The present invention is intended to solve the above-mentioned problems, and when a large number of normally closed contacts are required, it is possible to correct the shortage of the biasing force of the return spring, and the number of normally closed contacts can be increased. It is an object of the present invention to provide an electromagnetic contactor capable of selecting a return spring 4 having an appropriate urging force and capable of mounting a contact unit having an arbitrary contact structure without being limited by the above.

[0005]

According to the present invention, there is provided a first return spring having two return springs, which is urged in the opening direction when the movable core in the core unit is closed to open. A second return spring that corrects the urging force corresponding to the contact structure of the contact unit is installed in the contact unit, so that the contact unit has an arbitrary contact structure without being limited by the number of normally closed contacts. It is characterized in that it can be attached, and means for solving the above problems are described in the claims. That is, an object of the present invention is to provide a fixed iron core including a magnetic coil and a movable iron core,
And a first fixed insulating base that accommodates at least a first return spring that biases the movable iron core away from the fixed iron core, a first movable insulating base that connects the movable iron core, and the first movable insulating base. A first upper insulating base that slidably supports the housing, a housing in which the first fixed insulating base and the first upper insulating base are connected and fixed, and a fixed contact provided opposite to the first upper insulating base. A second upper insulation base, a second movable insulation base slidably supported by the second upper insulation base, and having a movable contact facing the fixed contact; the first upper insulation base;
A second fixed insulating base provided in the middle of the upper insulating base;
A second return spring mounted on a fixed insulating base and pressing the second movable insulating base, and means for detachably connecting the first movable insulating base and the second movable insulating base are provided, and the movable core and the fixed core are fixed. This is achieved by an electromagnetic contactor characterized in that the fixed contact and the movable contact are opened and closed by attracting or separating the iron core.

[0006]

With the above structure, a plurality of types of contact units are prepared and attached to the iron core unit to provide an electromagnetic contactor having an arbitrary contact structure and contact rating, and an electromagnetic contactor having an auxiliary contact unit. can do. That is, the electromagnetic contactor of the present invention is detachably divided into a contact unit and an iron core unit, and when it becomes necessary to replace the contact, only the contact unit may be removed and replaced with another contact unit. This makes the work required for replacement extremely easy. In addition, due to the unitization of the contact section, the path through which foreign matter from the contact section mixes into the electromagnet section, or dust generated in the electromagnet section mixes into the contact section is blocked by the case that constitutes the contact unit Improves reliability.

[0007]

Embodiments of the present invention will be described below with reference to FIGS. The same reference numerals shown in the drawings indicate the same parts or corresponding parts. <First Embodiment> A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an exploded view showing the assembly configuration of the iron core unit 10. The iron core unit 10 is arranged so that the fixed iron core 1 housed in the first fixed insulating base 6a, the electromagnetic coil 2 engaged with the fixed iron core 1, and the fixed iron core 1 in the first upper insulating base 7 face each other. Provided and the first movable insulating base 5
It is composed of a movable iron core 3 connected to a and a first return spring 4a arranged between the movable iron core 3 and the electromagnetic coil 2. FIG. 2 is an exploded view showing the configuration and assembly of the contact unit 13, in which the contact unit 13 is the second fixed insulating base 6.
movable contacts 11a (normally open contacts) and 11b (normally closed contacts) provided on the second movable insulating base 5b slidably fitted to b,
Fixed contacts 12a (normally open contacts), 12b fixed to the second upper insulating base 7b so as to face the movable contacts 11a, 11b.
(Normally closed contact) and a second return spring 4b inserted between the second fixed insulating base 6b and the second movable insulating base 5b. By selecting the second return spring 4b according to the number of normally-closed contacts, the return force to the movable core at the time of opening can be adjusted. As shown in FIG. 3, the iron core unit 10
The contact unit 13 includes a connecting portion that protrudes from the upper insulating base 7a of the iron core unit 10, and a second portion of the contact unit 13.
The fixed insulating base 6b can be attached with one touch by sliding the connecting portion in the direction of arrow P in FIG. At the same time, the first movable insulating base 5a of the iron core unit 10 and the second movable insulating base 5b of the contact unit 13 are fitted and connected to each other so that the operation of the movable iron core 3 is moved to the movable contacts 11a, 11b.
Can be transmitted to. Therefore, in the contact replacement work at the time of maintenance and inspection, it is possible to replace the contact unit 10 in the assembled state, so that the workability is improved.

In this embodiment, the contact unit 13 is
As shown in FIG. 4A, for example, a unit 13A composed of three sets of contacts and a unit 13B composed of four sets of contacts can be unitized. These contact units 13 have an arbitrary contact configuration and have a second return spring 4 in the contact unit 13.
The load is corrected by b, and the iron core unit 10 can be replaced and attached with one touch. As a result, the core unit 1 can be replaced by simply replacing the contact unit 13.
0 means that there is no need to replace it, and requests for changes in the number of contacts and contact configurations can be immediately dealt with, enabling procurement in a short delivery time.

Conventionally, for example, in an electromagnetic contactor having a four-contact structure, three types of return springs are required for load adjustment with respect to four kinds of contact structures. Originally, it is affected by the contact structure. Electromagnetic parts such as an iron core and an operating electromagnetic coil must also be prepared for each contact structure, but according to the present embodiment, an iron core using four common contact structures and an operating electromagnetic coil are used. Unit 10
By preparing only four types of contact units for the contact units, it is possible to procure all four-contact electromagnetic contactors. Further, by mounting the second return spring 4b, which also serves as a load adjustment corresponding to the contact configuration, inside the contact unit 13, adjustment of the urging force of the first return spring 4a due to an increase in the number of normally-closed contacts can be performed. Since the correction can be performed by the second return spring 4b provided in the unit 13, it is not necessary to limit the number of normally closed contacts, which facilitates the manufacture of various types of electromagnetic contactors. Further, as a result, in the related art, it is possible to prevent assembly failure due to an incorrect selection of the return spring 4 in FIG. 7 and improve the reliability of product quality.

<Second Embodiment> A second embodiment will be described with reference to FIG. In this embodiment, an auxiliary contact unit 14 for head-on mounting is provided on top of the contact unit 13 of the first embodiment.
This is an electromagnetic contactor with an auxiliary contact unit that can be connected in the direction of arrow Q by the same means as in the first embodiment.

In this embodiment, as shown in FIG. 6, the auxiliary contact unit 14 is provided with two contact points, that is, two contact points 14A, three contact points 14B and four contact points 14C. An electromagnetic contactor with a contact or a normally-closed contact can be manufactured using one iron core unit 10 only by combining the contact unit 13 and the auxiliary contact unit 14.

[0012]

According to the present invention, the second unit is provided in the contact unit.
By additionally installing the return spring, it is possible to correct the load due to the change in the contact structure, that is, the change in the biasing force of the return spring inside the contact unit, so it is necessary to replace the components of the iron core unit. It becomes possible to manufacture and procure an electromagnetic contactor having a contact unit having an arbitrary contact configuration by using the common iron core unit, and it is possible to shorten a product delivery time. In addition, the unitization of contacts cuts off the foreign material mixing path from the outside, improves the contact opening / closing function, and prevents oscillation due to foreign material mixing, which is a significant effect in improving the reliability of product quality. Was obtained. Furthermore, by making the contact part and the electromagnet part of the electromagnetic contactor into a unit, it is possible to replace the contact unit as it is in the assembled state at the time of contact replacement, which is extremely effective in improving workability. .

[Brief description of drawings]

FIG. 1 is an exploded view showing an assembly configuration of an iron core unit according to a first embodiment of the present invention.

FIG. 2 is an exploded view showing the configuration and assembly of the contact unit according to the first embodiment of the present invention.

FIG. 3 is a sectional view showing a configuration of a first embodiment of an electromagnetic contactor of the present invention.

FIG. 4 is a three-contact unit (a) of the first embodiment of the present invention,
It is a top view of a 4-contact unit (b).

FIG. 5 is a sectional view showing the structure of an electromagnetic contactor with an auxiliary contact unit according to the second embodiment of the present invention.

FIG. 6 is a two-contact unit (a) according to a second embodiment of the present invention,
It is a top view of a 3-contact unit (b) and a 4-contact unit (c).

FIG. 7 is a cross-sectional view showing a configuration of an auxiliary contact unit (a) and an electromagnetic contactor (b) of a conventional technique.

[Explanation of Codes] 1 ... Fixed iron core 2 ... Electromagnetic coil 3 ... Movable iron core 4 ... Return spring 5 ... Movable insulating material 6 ... Fixed insulating base 7 ... Upper insulating base 8 ... Screw 9 ... Terminal screw 10 ... Iron core unit 11a ... Movable contact (normally open contact) 11b ... Movable contact (normally closed contact) 12a ... Fixed contact (normally open contact) 12b ... Fixed contact (normally closed contact) 4a ... First return spring 4b ... Second return spring 5a ... First Movable contact base 5b ... Second movable insulation base 6a ... First fixed contact base 6b ... Second fixed insulation base 7a ... First upper insulation base 7b ... Second upper insulation base 13 ... Contact unit 14 ... Auxiliary contact unit

Claims (2)

[Claims] 1. A first fixed insulating base that houses at least a fixed iron core including an electromagnetic coil, a movable iron core, and a first return spring that biases the movable iron core in a direction away from the fixed iron core, and the movable iron core. A first movable insulating base that is connected, a first upper insulating base that slidably supports the first movable insulating base, a housing that connects and fixes the first fixed insulating base and the first upper insulating base, A second upper insulating base provided facing the first upper insulating base and having a fixed contact, and a second movable body having a movable contact slidably supported by the second upper insulating base and facing the fixed contact. An insulating base, a second fixed insulating base provided between the first upper insulating base and the second upper insulating base, and a second return mounted on the second fixed insulating base and pressing the second movable insulating base. The spring and the first movable insulating base and the second movable insulating base are detachably connected to each other. And means for, electromagnetic contactor, characterized in that for opening and closing between the moving contact and the fixed contact by adsorption or away movement of the movable core and the fixed iron core. 2. An electromagnetic contactor according to claim 1, wherein an auxiliary contact unit having an auxiliary contact is detachably attached to the electromagnetic contactor.