JPH0245932Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an electromagnetic contactor, and more particularly to an electromagnetic contactor having a plurality of grids for extinguishing arcs generated between contacts inside the electromagnetic contactor.

[Conventional technology]

A conventional electromagnetic contactor will be explained using FIG.

In the figure, a terminal 12 with one end protruding outside is fixed to a base 10 by screwing the other end. One end of a fixed contact 16 having a substantially U-shaped cross section is screwed to the other end of the terminal 12, and a fixed contact 14, which is an electrode, is connected to the other end. Further, an arc runner 18, which will be described later, is connected to the fixed contact 16 for guiding an arc to the grid.

A movable core 22 connected to a movable core pin 20 is installed inside the base 10 . A cross bar 26 is connected and fixed to the movable iron core 22 via a movable buffer rubber 24 . This cross bar 26 protrudes in the direction of the arc box 28 fixed to the base 10, and a movable contact 30 and a movable presser 46 are provided near its tip.
The movable contact 30 has a movable contact 32, which is an electrode, at a position opposite to the fixed contact 14.
is located. That is, during the contact contact operation, the movable contact 32 moves toward the fixed contact 14 and further contacts the fixed contact 14, thereby energizing the movable contact 32.
The movable contact 30 is always urged by a contact spring 38 in a direction opposite to its movable direction. Here, 36 is a push spring support, and 34 is a stopper that engages with the cross bar 26 and the contact spring 38.

A plurality of arc extinguishing grids 40 are arranged in the arc box 28, and a fixed contact 14 and a movable contact 32 are arranged near the grids.
A commutation plate 42 is provided to guide the arc occurring between the two to the grid 44. That is, the other end of the arc runner 18 described above and this commutation plate 42
By sandwiching the grid 40 between the contacts in a non-contact manner, the arc generated between the contacts can be guided in the direction of the grid 40, and the arc can be broken at this grid.

Here, one end of the grid 40 and the commutation plate 42, which are connected to the arc box 28, are bent and fixed to the arc box 28, respectively, as shown in FIG.

Further, an arced gas discharge port 44 is formed near the grid 40 of the arc box 28. This arced gas discharge port 44 is for discharging arced gas generated when an arc occurs to the outside world. In addition, in the figure, 48 is an insulation barrier, which aims at insulation between the terminal 12 and other terminals.

Next, the operation of this conventional electromagnetic contactor will be explained. When a voltage is applied to a drive unit (not shown), the movable iron core 22 is attracted to a fixed iron core (not shown), and the crossbar 26 connected to the movable iron core 22 moves due to this suction movement (see FIG. 1). to the right). Therefore, the movable contact 30 disposed on the cross bar 26 moves toward the fixed contact, and finally the drive contact 32 joins the fixed contact 14. The two are now electrically connected.

On the other hand, when the voltage applied to the drive section is cut off, the movable core 22 and the crossbar 26 are returned by the contact spring 38 and stopped at their original positions.

An arc is generated when the fixed contact and the movable contact are separated. Due to the action of magnetic flux, this arc is transmitted from the fixed contact side via the arc runner 18 and from the movable contact 32 side to the commutator plate 4.
2 will be guided upward in the figure. The arc guided upward is gradually cooled, further divided by the grid 40, and eventually extinguished. In this case, the generated arced gas is discharged from the arced gas discharge port 44 described above.

[The problem that the idea aims to solve]

However, in the conventional electromagnetic contactor, as described above, the grid 40 and the commutation plate 42
Since the arc box 28 is fixed to the arc box 28 by bending one end thereof, this crimping operation is troublesome and there is a problem that the arc box 28 may be damaged depending on the amount of force applied during bending.

Purpose of the invention The present invention was devised in view of the above-mentioned conventional problems, and its purpose is to provide an electromagnetic contactor that is easy to assemble and can extinguish arcs reliably, allowing for easy placement of grids and commutation plates. It is about providing.

[Means to solve the problem]

In order to achieve the above object, an electromagnetic contactor according to the present invention includes: a fixed electrode and a movable electrode arranged opposite to each other; a plurality of arc dividing grid plates arranged in a row near the electrode; and an arc induction commutation plate disposed close to the grid plate, an inner frame that houses the electrode, the grid plate, and the commutation plate, and an outer case into which the inner frame is fitted. , the inner frame is formed with an insertion groove into which each of the grid plates is inserted along a direction perpendicular to the electrode facing direction, and a plurality of gas blowing openings are formed in the outer case in a direction perpendicular to the electrode facing direction; The inner frame and the outer frame are preferably formed with a receiving part and a holding part that work together to sandwich and fix the commutator plate when the inner frame and the outer frame are fitted together.

[Effect]

According to the above configuration, the plurality of grid plates are respectively inserted into the insertion grooves formed in the inner frame. Further, the commutation plate is sandwiched and fixed between a receiving portion and a holding portion formed on the inner frame and the outer case.

Therefore, the grid plate and the commutator plate can be easily installed without requiring any work such as caulking.

Furthermore, since the outer case has gas blow-off openings formed in a direction perpendicular to the direction in which the electrodes face each other, the gas generated between the grid plates is quickly and linearly discharged from the gas blow-off openings to the outside world.

〔Example〕

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

2 and 3 show a preferred embodiment of the electromagnetic contactor according to the present invention. In Figure 2,
A cross section of the electromagnetic contactor is shown, and FIG. 3 shows the arrangement of each component of the electromagnetic contactor.
Here, the members explained in FIG. 1 are given the same reference numerals and their explanations will be omitted.

A characteristic feature of the electromagnetic contactor according to the present invention is that, as shown in FIG.
and an outer case 52.
A notch opening 56 is formed on one side of the inner frame 50, and a plurality of insertion grooves 54 for inserting the aforementioned grids are formed in alignment on the edge of the opening. In other words, the grid 40 can be easily installed in the electromagnetic contactor using the insertion groove 54, and the conventional crimping work is not required. In this embodiment, the grid 40 consists of four pieces, two of which are formed with U-shaped legs for surrounding the fixed contacts and the movable contacts in a non-contact manner.

A receiving portion 58 for arranging the commutation plate 42 is formed in the inner frame 50. On the other hand, the outer case 52 is formed with a holding part 60 that cooperates with the receiving part 58 to clamp the commutation plate 42 . That is, the commutation plate 42 is
can be easily fitted and fixed without using any fixing tools.

Note that the inner frame 50 and the outer case 52 are
As shown in the figure, they are both fixed to the base 10 (not shown) through fixing holes 62 and 64 provided in both.

Therefore, as described above, the electromagnetic contactor can be reliably and easily assembled by fitting the outer case 52 with the grid 40 and commutation plate 42 attached to the inner frame 50. In addition, in the figure, 44 is a gas blow-off opening for blowing out arced gas.

Next, further explanation will be given using FIG. 2.

FIG. 2 shows a cross section of the electromagnetic contactor according to the present invention, and if the correspondence with FIG. 3 is shown, it is a cross section in the direction indicated by the arrow in FIG.

In FIG. 2, the grid 40 is arranged with its surface direction in a direction perpendicular to the direction of movement of the movable contact 30 (direction perpendicular to the contact facing direction). Also, as understood from the figure, the outer case 5
2, gas blow-off openings 44 are formed at corresponding positions between each grid 40.

As illustrated, the commutation plate 42 is fitted between the receiving portion 58 and the holding portion 60.

In this embodiment, the arc is induced by the action of the fixed contact 16 and the commutation plate 42.

In other words, to explain its function, the fixed contact 1
The arc generated when the movable contact 32 is separated from the fixed contact 14 is guided above the fixed contact 16 from the one movable contact, and is guided from one of the movable contacts to the upper part 42 of the commutation plate. It is cooled, further divided by the grid 40, and the arc is extinguished. Then, the arced gas generated by this arc moves linearly between the grids 40 and is ejected from the gas blowing opening 44 to the outside world. Therefore, the movement of arced gas is not obstructed by the grid.
The gas can be quickly blown out to the outside without being retained inside the electromagnetic contactor, and it is possible to effectively prevent the effects of arced gas on the electromagnetic contactor, such as poor insulation.

[Effect of idea]

As explained above, according to the electromagnetic contactor according to the present invention, the grid plate and the commutator plate can be easily attached to the electromagnetic contactor without the need for caulking work, etc. as in the conventional method, so that the number of assembly steps can be simplified. It is possible to attach the device reliably. Also,
Even after assembly, by separating the inner frame and outer case, each member can be easily replaced. Furthermore, since the arced gas can be exhausted well, a highly reliable electromagnetic contactor can be provided.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional electromagnetic contactor, Fig. 2 is a sectional view of an electromagnetic contactor according to the present invention, and Fig. 3 is a perspective view showing the arrangement relationship of each member of the electromagnetic contactor according to the present invention. be. In the figure, 14 is a fixed contact, 16 is a fixed contact, 30 is a movable contact, 32 is a movable contact, 40 is a grid, 42 is a commutation plate, 44 is a gas blowing opening,
50 is an inner frame, 52 is an outer case, 54 is an insertion groove, 58 is a receiving portion, and 60 is a holding portion. In addition,
In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] A fixed electrode and a movable electrode arranged to face each other; a plurality of grid plates arranged in a row near the electrode; and a plurality of grid plates arranged close to the electrode and the grid plate. a commutator plate; an inner frame that accommodates the electrode, the grid plate, and the commutator plate; and an outer case into which the inner frame is fitted; An insertion groove into which each of the grid plates is inserted is formed along the outer case, a plurality of gas blowing openings are formed in the outer case in a direction perpendicular to the direction in which the electrodes face each other, and the inner frame and the outer frame have a plurality of gas blowing openings formed in the inner frame and the outer frame when both are fitted together. An electromagnetic contactor characterized in that a receiving part and a holding part are formed to sandwich and fix the commutation plate.