JPH0453061B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnetic switch used in a liquid such as oil, and particularly to a configuration for smoothing the operation of a movable iron core.

[Conventional technology]

Switchboards installed in the deep sea, such as deep-sea submersible vessels, are usually formed with a sealed structure to withstand the high water pressure of the deep sea, and the inside of the switchboard is filled with insulating oil. FIG. 2 is a block diagram showing a schematic configuration of a power distribution board used in the deep sea. In the figure, 21 is a sealed power distribution board, 22 is an expandable bellows provided at one end of the power distribution board 21, and 23 is filled inside the power distribution board 21. The insulating oil 24 is an electromagnetic contactor installed in the insulating oil 23 in the switchboard 21. And insulating oil 2 inside the switchboard 21 against high water pressure in the deep sea.
The structure is such that the hydraulic pressure of 3 is balanced by the bellows 22.

A conventional electromagnetic contactor of this type is shown in FIG. In the figure, reference numeral 1 denotes a mounting plate made of a ferromagnetic material and has a plurality of mounting holes (not shown) for mounting the electromagnetic contactor 24 to a mounting board or the like.
Reference numeral 2 denotes a yoke plate made of ferromagnetic material, which is screwed to the mounting plate 1 (not shown). A coil spool 3 made of an insulating material has a cylindrical through hole 4 in the center and is provided between the yoke plate 2 and the mounting plate 1. 5
is an operating coil inserted into the coil spool 3. 6 is a cylindrical fixed core made of ferromagnetic material,
It is inserted into a cylindrical through hole 4 and fixed to the mounting plate 1 by caulking. 7 is a base made of insulating material,
It is fixed to the yoke plate 2 with screws (not shown). 8 is a cylindrical movable iron core made of ferromagnetic material,
It is connected to a crossbar 10 formed of an insulator by a pin 9, and is movable inside the cylindrical through hole 4. A movable contact 11 made of a conductive material is inserted between the crossbar 10 and the spring receiver 12. It is inserted between the crossbar 10 and the spring receiver 12 by a compression spring 13. Movable contact 1
1 has movable contacts 11a at both ends. A fixed contact 14 made of a conductive material has a fixed contact 14a at one end, a terminal screw 14b at the other end, and is attached to the base 7.

The conventional electromagnetic contactor is configured as described above, and when a current is passed through the operating coil 5, the electromagnetic force generated by this drives the movable iron core 8 downward, and the cross bar 10 connected thereto is driven downward. . As a result, the movable contact 11a is driven downward and the fixed contact 1
Contact with 4a. When the current flowing through the operating coil 5 is cut off, the electromagnetic force disappears, and the crossbar 10 is driven upward by the push spring 13 and a trip spring (not shown), and the movable contact 11a and the fixed contact 14
a opens.

[Problem that the invention seeks to solve]

In the conventional electromagnetic contactor 24 as described above, insulating oil 1 is also contained in the cylindrical through hole 4 of the coil spool 3.
5 is filled, and in order for the movable core 8 to drive inside the cylindrical through hole 4 of this coil spool 3, especially when the movable core 8 is attracted toward the fixed core 6, the cylindrical through hole 4 is filled. There are few escape routes for the insulating oil 15 filled in the insulating oil 15, and the flow of the insulating oil 15 itself is poor, so the hydraulic pressure of the insulating oil 15 prevents the movement of the movable iron core 8, so the movement of the movable iron core 8 is slow. There was a problem with the lack of responsiveness.

Furthermore, since the flow of the insulating oil 15 was poor, there was a drawback that the cooling efficiency inside the electromagnetic contactor 24 was poor.

This invention was made in order to solve such problems, and provides an electromagnetic switch that can operate the movable iron core smoothly to improve responsiveness and improve cooling efficiency. With the goal.

[Means for solving problems]

The electromagnetic switch according to the present invention includes a coil spool having a through hole, a coil inserted into the coil spool, and a fixed coil inserted and fixed into the through hole of the coil spool and excited by the coil. An electromagnetic contactor comprising an iron core and a movable iron core that is loosely inserted into a through hole of the coil spool, is disposed opposite to the fixed iron core, and moves within the through hole, and is disposed in a container filled with liquid. and, in the one in which the liquid flows inside the electromagnetic contactor, a first part is provided in the fixed core, which constantly communicates a space between the fixed core and the movable core with the inside of the container outside the electromagnetic contactor. A through hole for fluid circulation is provided in the movable core, and a second through hole for fluid circulation is provided in the movable core to allow constant communication between the opposing space and the rest of the electromagnetic contactor.

[Effect]

In this invention, each of the fixed core and the movable core is provided with a through hole for fluid circulation that connects to the opposing space between the fixed core and the movable core, so when the movable core is attracted toward the fixed core, Liquid such as oil existing in the opposing space flows out into the electromagnetic contactor other than the opposing space through the through hole of the movable core, and also flows into the container outside the electromagnetic contactor from the through hole of the fixed core. leak. At this time, the liquid that has flowed out into the container outside the electromagnetic contactor flows into the electromagnetic contactor from inside the container through the hole of the electromagnetic contactor other than the through hole of the fixed core. When the movable core is attracted to the fixed core, the core etc. generate heat, so natural convection occurs in which liquid flows inside and outside the electromagnetic contactor through each of the through holes, and the core etc. are cooled. Conversely, when the movable core separates from the fixed core, part of the liquid such as oil present inside the electromagnetic contactor other than the opposing space flows into the opposing space through the through hole of the movable core. At the same time, it flows from inside the container into the opposing space through the through hole of the fixed iron core. At this time, the liquid that has flowed into the electromagnetic contactor from the through hole of the fixed iron core flows out into the container outside the electromagnetic contactor through the hole of the electromagnetic contactor other than the through hole of the fixed iron core.

[Embodiments of the invention]

FIG. 1 is a sectional view showing one embodiment of the present invention, and numerals 1 to 5, 7, and 9 to 15 are completely the same as the conventional electromagnetic contactor described above. 16 is a fixed iron core,
A through hole 16a is provided in the central axis direction of the fixed core 16 so that the inside and outside communicate with each other and the insulating oil 15 flows therethrough. This fixed core 16 is attached to the mounting plate 1
It is caulked and fixed. 17 is a movable iron core, and a through hole 17a is provided in the central axis direction of this movable iron core 17. Furthermore, a through hole 17b is provided to intersect with this through hole 17a, and an insulating oil 15
It is designed so that it can be distributed. and pin 9
It is connected to the crossbar 10 by.

In the electromagnetic contactor configured as described above, when the movable core 7 is attracted toward the fixed core 16, the opposing space between the fixed core 16 and the movable core 17 in the cylindrical through hole 4 of the coil spool 3 is created. The insulating oil 15 in the portion 4A flows out of the electromagnetic contactor through the through hole 16a of the fixed core 16 as shown by arrow A, and flows out through the through holes 17a and 17b of the movable core 17 to the coil spool 3 as shown by arrow B. It flows out to the upper part and then coil spool 3
The insulating oil 15 in the opposing space 4A of the cylindrical through hole 4 is discharged to the outside of the space 4A. At this time, the insulating oil 15 that has leaked out of the electromagnetic contactor, that is, into the switchboard, flows into the electromagnetic contactor from inside the switchboard through holes (not shown) of the electromagnetic contactor other than the through holes 16a of the fixed core 16. When the movable core 17 is attracted to the fixed core 16, these cores 16, 17, etc. generate heat. A natural convection occurs in which the insulating oil 15 flows, and each iron core 16,
17 mag will be cooled down. Further, when the movable core 17 is driven upward, the insulating oil 15 in the upper part of the coil spool 3 passes through the through holes 17a and 17b of the movable core 17 and moves into the opposing space 4 as shown by arrow C.
At the same time, the insulating oil 15 outside the electromagnetic contactor also flows into the opposing space 4A as indicated by arrow D through the through hole 16a of the fixed iron core 16. At this time, the amount of insulating oil 15 that has flowed into the electromagnetic contactor from the through hole 16a of the fixed iron core 16 flows into the power distribution board outside the electromagnetic contactor through holes (not shown) of the electromagnetic contactor other than the through hole 16a of the fixed iron core 16. leaks to.

In this way, the insulating oil 15 in the opposing space 4A flows.

In the above embodiment, a through hole 17a passing through the movable core 17 in the axial direction and a through hole 17b communicating with the through hole 17a are provided in order to make the operation of the movable core 17 extremely good. Although explained, such through holes 17a, 1 are not necessarily provided.
It is not necessary to provide the through hole 17b, for example, the through hole 17b may not exist, or the through hole 17b and this through hole 17 may be formed without providing the through hole 17a.
A hole communicating with b (of course, this hole communicates with the opposing space 4A) may be provided, and even in this case, the intended purpose of the present invention can be achieved. obtain.

Further, although the above embodiment has been explained using an electromagnetic contactor as an example, it goes without saying that the present invention can be applied to other electromagnetic switches having the same configuration as this electromagnetic contactor. Nor.

〔Effect of the invention〕

As described above, according to the present invention, a coil spool having a through hole, a coil inserted into the coil spool, and a coil inserted and fixed into the through hole of the coil spool are excited by the coil. An electromagnetic contactor comprising a fixed iron core that is loosely inserted into a through hole of the coil spool and a movable iron core that is disposed opposite to the fixed iron core and moves within the through hole is placed in a container filled with liquid. In the electromagnetic switch, which is disposed in In addition to providing a first through hole for fluid circulation that communicates with each other at all times, a second through hole for fluid circulation that causes constant communication between the opposing space and the rest of the electromagnetic contactor is provided in the movable core. When the movable core is attracted toward the fixed core,
The liquid present in the opposing space can be allowed to escape into the electromagnetic contactor other than the opposing space through the through-hole of the movable core, and also into the container outside the electromagnetic contactor through the through-hole of the fixed core. This makes it possible to reduce the hydraulic pressure that tends to prevent the movement of the movable iron core, making the movement of the movable iron smoother and improving responsiveness.

Furthermore, when the movable core is attracted to the fixed core, natural convection occurs in which liquid flows inside and outside the electromagnetic contactor through the through holes due to the heat generated by the core, etc., thereby improving cooling efficiency.

Conversely, when the movable core separates from the fixed core, the liquid existing inside the electromagnetic contactor other than the opposing space and the liquid in the container can be drained from the through holes of the movable core and the fixed core to the opposing space. Since the movable iron core can flow into the area, the movement of the movable iron core becomes smoother.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an electromagnetic contactor according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a switchboard used in deep sea, and FIG. 3 is a sectional view of a conventional electromagnetic contactor. In the figure, 1 is the mounting plate, 3 is the coil spool,
4 is a through hole, 4A is an opposing space, 5 is an operating coil, 15 is an insulating oil, 16 is a fixed iron core, 17 is a movable iron core, 16a is a through hole (first fluid circulation through hole), 17a, 17b are 21 is a switchboard (container), 23 is insulating oil (liquid), and 24 is an electromagnetic contactor. In each figure,
The same symbols indicate corresponding parts.

Claims (1)

[Claims] 1. A coil spool having a through hole, a coil inserted into the coil spool, and a fixed iron core inserted and fixed into the through hole of the coil spool and excited by the coil. , an electromagnetic contactor comprising a movable core that is loosely inserted into a through hole of the coil spool, is disposed opposite to the fixed core, and moves within the through hole, and is disposed in a container filled with liquid; In the electrode switch in which the liquid flows inside the electromagnetic contactor, a first electrode switch is provided in the fixed core, which constantly communicates a space between the fixed core and the movable core with the inside of the container outside the electromagnetic contactor. An electromagnetic switching device characterized in that a through hole for fluid circulation is provided in the movable core, and a second through hole for fluid circulation is provided in the movable core to constantly communicate the opposing space with the rest of the electromagnetic contactor. vessel.