JPH0129966Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electromagnetic contactor, and particularly to an electromagnetic contactor for controlling the opening and closing of an electric circuit such as an electric motor.

2. Description of the Related Art Opening and closing of electric circuits of electric motors and the like is normally performed using electromagnetic contactors. This electromagnetic contactor has a fixed core and a movable core, and by controlling the excitation or demagnetization of the fixed core, the movable core moves toward and away from the fixed core, and as the movable core moves toward and away from the core, the contacts open and close, i.e. The electrical circuit is opened and closed.

Figure 1 shows the configuration of a conventional electromagnetic contactor.
A fixed core 12 is housed and held in a holding frame 10. An operating coil 1 is attached to the magnetized leg of this fixed iron core 12.
4 is installed, and the fixed iron core 12 is excited or demagnetized by supplying or cutting off an excitation current to the operation coil 14.

A movable core 16 is located opposite the fixed core 12.
is provided slidably with respect to the holding frame 10, and the movable iron core 1 is moved by the excitation action of the fixed iron core.
6 is connected to and separated from the fixed iron core 12.

Opening/closing of an electric circuit of an electric motor or the like is achieved by the contact opening/closing action of a contact mechanism, and this contact opening/closing action is performed in conjunction with the above-mentioned action of moving the movable core 16 toward and away from the fixed core 12.

That is, the contact mechanism includes a cross bar 18 attached to the movable iron core, a movable contact 20 disposed on the cross bar, and a holding frame 1 facing the movable contact.
0, and as the movable core 16 moves toward and away from the fixed core 12, the crossbar 18 is interlocked with the movable contact 22.
0 is connected to and disconnected from the fixed contact, that is, the opening and closing of the electric circuit is achieved.

The opening/closing control of the electric circuit in this type of electromagnetic contactor is performed by supplying an excitation current to the operating coil 14 as described above, and the operating coil body 21 provided with the operating coil 14 is shown in FIG. 2 or 3. It consists of the configuration shown below.

That is, the operating coil body 21 is formed from a coil spool 23 and a winding wound around the coil spool 23, that is, the operating coil 14, and a coil terminal 24 is fixed to the terminal portion of the operating coil 14. be done.

The coil terminal 24 is attached to the terminal portion by fixedly connecting the terminal portion of the coil lead wire 26 extending from the coil spool 23 to the coil terminal 24, as shown in FIG. In addition, as shown in FIG.
Attach it to the coil spool 23 and coil terminal 24.
This is accomplished by integrally forming the coil terminals 24 and 24, and fixedly connecting the terminal end of the operating coil to the base end portion of the coil terminal 24 when winding of the winding wire is completed.

A combination of the operating coil body 21 and the coil terminal 24 is housed and held in a mounting frame 28 of the electromagnetic contactor. The coil terminal 24 is screwed to a terminal holder provided on the mounting frame 28 together with a signal terminal from a control circuit (not shown) that controls the excitation current.

However, in this type of device, since the operation coil body 21 is held by the mounting frame 28, the size of the coil spool 23 of the operation coil body must be matched to the size of this attachment frame 28. Therefore, when the size of the mounting frame 28 differs for each electromagnetic contactor, there is a problem in that it is necessary to prepare the operating coil body 21 corresponding to the size of each mounting frame 28.

Furthermore, in the case of a configuration in which the coil terminal 24 is integrally formed with the coil spool 23 as shown in FIG. There was a problem in that the vibration transmitted through the coil terminal 24 acted on the mounting frame 28, and the entire device was adversely affected by the vibration.

That is, since the coil terminal 24 is generally screwed to the signal line terminal as described above, the terminal usually has a screw portion 24a formed therein. Therefore, it is necessary to increase the thickness of the coil terminal so that it can be formed with a screw.
As a result of the coil terminal 24 being fixed to a terminal holder or the like, there was a problem in that the entire device vibrated as described above due to the impact caused by the vibration of the two iron cores 12 and 16 coming into contact and separating. In order to eliminate such drawbacks, it is possible to form the base extension part 24b of the coil terminal 24 with a thin wall and to alleviate the vibration by elastic deformation of this base extension part. There is a drawback that stress concentration occurs at the boundary between the coil terminal and the thick threaded portion, and the coil terminal 24 is damaged at this boundary.

In addition, as shown in FIG. 3, when the coil terminal 24 is elongated and formed integrally with the coil spool 23, the coil terminal 24 protrudes from the coil spool when the coil wire is wound around the coil spool 23. As a result, there was a problem in that a separate jig had to be manufactured to prevent this from occurring.

The present invention was devised in view of the above-mentioned conventional problems, and its purpose is to be able to securely hold the operating coil body without depending on the size of the mounting frame of the electromagnetic contactor, and to make it possible to securely hold the coil terminal. An object of the present invention is to provide an electromagnetic contactor that eliminates harmful effects such as damage.

In order to achieve the above object, the present invention includes an operating coil body that is inserted into the magnetized leg of a fixed core and housed in a mounting holding frame, and a coil terminal portion that guides an exciting current to the operating coil of the operating coil body. , in an electromagnetic contactor that opens and closes an electric circuit by controlling an excitation current supplied to an operating coil through a coil terminal part, the coil terminal part is connected to the operating coil body, and a resilient part is formed at one end. coil lead and
fixed to the coil spool of the operating coil body,
a coil lead receiving frame for holding the coil lead; a coil terminal holder having one end attached to the mounting holding frame and the other end abutting the coil spool of the operating coil body; a coil terminal engagement hole that accommodates the resilient portion of the coil lead; and a coil terminal that is fixed to the coil terminal holder and is disposed at a position where one end faces the resilient portion of the coil lead in the coil terminal engagement hole. wherein the elastic portion of the coil lead and one end of the coil terminal disposed opposite thereto are elastically brought into contact within the coil terminal engagement hole, so that the elastic portion of the coil lead is separately and independently formed. It is characterized by electrically connecting the operating coil body and the coil terminal.

Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 4 shows the configuration of the electromagnetic contactor according to the present invention, and the same members as those in the conventional device are given the same symbols and their explanations are omitted. In this embodiment, the movable core 16, the fixed The shape of the iron core 12 is different from that of the conventional example shown in FIG.
is disposed near the center of the fixed core 12, and the fixed core 12 is inserted into the central cavity of the operating coil body 21. However, these differences are not essential, and the movable core 16 is still moved toward and away from the fixed core 12 by controlling the current to the operating coil body.

A feature of the present invention is that the operating coil body and the coil terminal are not integrally formed, but are separated and constructed separately, and the coil terminal is held by a coil terminal holder.

In this embodiment, a coil lead receiving frame 30 is formed on the end face of the coil spool 23 of the operating coil body 21, and a coil lead 32 is inserted and fixed into this coil lead receiving frame 30 as shown in FIG.

On the other hand, an engagement gap is formed between the engagement plate 34 of the coil lead receiving frame 30 and the side end surface of the coil spool 23, and a coil terminal receiver 36 shown in FIG. 6 is fitted into this engagement gap. There is.

The coil terminal receiver 36 is made of thermoplastic synthetic resin or the like, and has a coil terminal engagement hole 38 and a screw insertion hole 40 formed therein, and has a hole opposite to the coil terminal engagement hole 38. An elastic locking plate 42 is formed at the side end. The coil terminal 24 is installed in the coil terminal receiver 36 as shown in FIGS. 7 and 8.

That is, as shown in FIG. 9, the coil terminal 24 is made of a conductive material such as a copper plate, and one end thereof is bent to form an engaging portion 46, and the opposite end thereof is formed with a bent locking piece 48. Further, a threaded portion 24a is formed in the central portion. By engaging or locking the engaging portion 46 of the coil terminal 24 with the coil terminal engaging hole 38 and the bent locking piece 48 with the elastic locking plate 42, the coil terminal 24 is fitted into the coil terminal receiver 36. It will be installed.

In this state, resilient contact between the coil terminal 24 and the coil lead 32 is achieved. That is, as shown in FIG. 10, the tip of the coil lead 32 is bent to form a resilient part 50. Therefore, when the coil lead 32 is attached to the coil lead receiving frame 30, the coil terminal 24 is inserted into the coil lead receiving frame 30. By attaching the coil terminal to the coil terminal receiver 36, resilient contact between the engaging portion 46 of the coil terminal and the resilient portion 50 of the coil lead 32 is achieved. In this embodiment, the coil terminal holder 36 is only supported in engagement between the coil spool 23 and the engagement plate 34 of the coil lead holder frame 30. While ensuring continuity, minute vibrations of the coil spool 23 are absorbed by elastic deformation of the resilient portion 50 and are not transmitted to the coil terminals. In addition, the resilient portion 50 of the coil lead 32
is inserted into the coil terminal engaging hole 38, so that the contact pressure between the resilient portion 50 and the coil terminal 24 is stabilized, and the electrical contact resistance can also be stabilized.

A desired terminal of the operating coil is fixedly connected to a connecting portion 52 provided at the lower end of the coil lead 32 by soldering or the like.

Therefore, in this embodiment, by forming the coil terminal 24 and the operating coil body 21 separately as described above, it is possible to prevent the shock vibrations caused by the contact and separation of the movable core 16 from being directly transmitted to the coil terminal. It is possible to prevent mechanical damage to the coil terminals and vibration of the device.

That is, in this embodiment, the coil terminal receiver 36
is only engaged and supported between the coil spool 23 and the engagement plate 34 of the coil lead receiving frame 30, so minute vibrations of the coil spool 23 are not transmitted, and the coil lead 32 is made of a conductive elastic metal thin plate. The impact vibration can be alleviated by the elastic deformation of the elastic portion 50, and thereby the vibration generated when the two iron cores 12, 16 are brought into contact with each other and separated from each other can be prevented from directly acting on the coil terminal. Therefore, it is possible to form the coil terminal 24 thickly, and it is possible to facilitate the formation of the threaded portion 24a.

Further, in this embodiment, the operating coil body 21 can be directly abutted and supported by the coil terminal receiver 36. That is, in the present embodiment, the coil terminal receiver 36 is attached and fixed to the mounting portion 54 of the mounting frame 28, and as a result of the distal end surface of the coil terminal receiver 36 being engaged with the engagement gap as described above, this distal end The surface can come into contact with and support the coil spool 23 of the operating coil body 21, and the operating coil body 21 is reliably held within the mounting frame 28. Therefore, according to this embodiment, the mounting frame 28
It becomes possible to use a common coil spool 23 regardless of its size. That is, the mounting frame 28
If the coil spool 23 is small, the length from the base to the tip of the coil terminal holder 36 is increased by an amount corresponding to the small amount.
It is possible to abut and support the coil spool 23, that is, the operating coil body 21, by the tip end surface of the coil terminal receiver 36, and in this way, the dimensions of the coil terminal receiver 36 can be adjusted as appropriate according to the size of the mounting frame 28 of the electromagnetic contactor. By changing the dimensions to , it is possible to use a common coil spool 23 for the operation coil body 21. In this embodiment, the coil terminal receiver 36 is easily formed by injection molding of plastic, so the device can be manufactured extremely economically compared to the conventional device in which the coil spool 23 is manufactured each time according to the mounting frame 28. I can do it.

As explained above, according to the present invention, it is possible to reliably hold an operating coil body using a common coil spool in the device regardless of the size of the mounting frame.

In addition, since a common spool can be used, winding the wire onto the coil spool is extremely easy, and the labor of manufacturing the coil spool each time according to the mounting frame can be saved, making the manufacturing of the device extremely economical. It can be carried out.

Furthermore, in the present invention, since the operating coil body and the coil terminal are formed separately and separately, it is possible to prevent shock vibrations caused by the movement of the movable iron core toward and away from the fixed iron core from being applied directly to the coil terminal. It is possible to effectively avoid mechanical damage.

[Brief explanation of the drawing]

Figure 1 is a schematic configuration diagram showing a conventional electromagnetic contactor.
Figures 2 and 3 are external views showing the combination of the operating coil body and coil terminal of the conventional device, Figure 4 is a cross-sectional configuration diagram of the main part of the electromagnetic contactor according to the present invention, and Figure 5 is the present invention Fig. 6 is an external view showing a state in which a coil lead is installed in the operating coil body of the electromagnetic contactor according to Fig. 4.
Figure 7 is a perspective view showing the coil terminal holder of the device; Figure 7 is an external view showing the state of connection between the operating coil body and coil terminal of the device; 9 is a perspective external view showing the coil terminal of the device shown in FIG. 4, and FIG. 10 is an external view showing the coil lead of the device of the present invention. The same members in each figure are given the same reference numerals, 14 is the operating coil, 21 is the operating coil body, 23 is the coil spool, 24 is the coil terminal, 28 is the mounting frame, 32
36 is a coil lead, 36 is a coil terminal holder, and 50 is a spring portion.

Claims (1)

[Scope of Claim for Utility Model Registration] An operating coil body inserted into a magnetized leg of a fixed iron core and housed in a mounting holding frame, and a coil terminal portion that guides an excitation current to the operating coil of this operating coil body,
In an electromagnetic contactor that opens and closes an electric circuit by controlling excitation current supplied to an operating coil through a coil terminal section, the coil terminal section is connected to the operating coil body, and a resilient section is formed at one end. a coil lead that is fixed to the coil spool of the operating coil body and holds the coil lead, one end of which is attached to the mounting and holding frame, and the other end of which is in contact with the coil spool of the operating coil body. a coil terminal holder that is in contact with the coil terminal holder; a coil terminal engagement hole that is provided in the coil terminal holder and accommodates the resilient portion of the coil lead; and a coil that is fixed to the coil terminal holder and has one end of the coil terminal engagement hole. a coil terminal disposed at a position opposite to the resilient part of the lead, and the resilient part of the coil lead and one end of the coil terminal disposed at a position opposite thereto are connected to each other in the coil terminal engagement hole. An electromagnetic contactor characterized in that an electrical connection is made between an operating coil body formed separately and a coil terminal by making resilient contact inside.