JPS6011603Y2 - Plunger type electromagnet device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a plunger type electromagnet device.

Conventionally, in this type of electromagnetic device, the current value at which the movable iron core starts to move, that is, the electric current value, is appropriately changed and adjusted to ensure versatility and, as a result, it has not been possible to reduce the cost.

The present invention aims to eliminate this drawback and provide a plunger type electromagnet device that can appropriately change and set the electric current value.

The present invention will be described in detail below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a plunger type electromagnet device of the present invention, which is equipped with a cylindrical yoke 2 whose both end faces are closed.

A fixed iron core 3 is fixed to the inner side of one end surface of the cylindrical yoke 2.

Reference numeral 4 denotes a movable iron core disposed within the cylindrical yoke 2, one end of which is opposed to the fixed iron core 3 at a distance l□ via a return spring 5, and a portion of the other end of which is disposed within the cylindrical yoke 2.
It is extended to the outside through a hole in the other end surface.

Reference numeral 6 denotes an adjustment screw made of a non-magnetic material that is loosely fitted around the external extension of the movable core 4 and fitted into a threaded portion formed on the peripheral wall of the hole, one end of which is connected to the other end of the movable core 4. is pressed against the return spring 5 to adjust the distance 12 between the other end surface of the movable iron core 4 and the inside of the other end surface of the cylindrical yoke 2.

Reference numeral 7 denotes a cylindrical drive coil disposed on the inner peripheral wall of the cylindrical yoke 2, and the fixed iron core 3 and the movable iron core 4 are connected inside the cylinder.
and are arranged opposite to each other with a return spring 5 interposed therebetween.

When a current is applied to the drive coil 7, a magnetic attraction force is generated in the gap a between the fixed core 3 and the movable core 4 and the gap between the movable core 4 and the inside of the other end surface of the cylindrical yoke 2. induced.

A movable iron core 4 in which the current value increases and the magnetic attraction force of the air gap a becomes larger than the sum of the magnetic attraction force of the air gap and the spring force of the return spring 5.
moves in three directions around the fixed core.

If the current value at which the movable iron core 4 begins to move is called the moving current, the relationship between the moving current and the gap distance is as follows.
When the length of the gap a was 4 mm and the maximum diameter of the movable core 4 and the fixed core 3 was 1-, it was as shown in FIG.

Therefore, by rotating and adjusting the adjustment screw 6 made of a non-magnetic material, the gap distance 12 can be set appropriately, and the moving current can be adjusted and set as appropriate.

At this time, the distance 11 of the air gap a also changes, but it has been experimentally confirmed that this has a negligible effect on the moving current compared to the change in the distance 12 of the air gap.

FIG. 3 shows a circuit breaker to which the plunger type electromagnet device 1 of the present invention is applied.

According to the circuit breaker of FIG. 3, by appropriately adjusting the adjusting screw 6, the current to be impressed, in other words, the rated current can be set as desired.

The other configurations and operations are probably well known and will therefore be omitted.

As is clear from the above, the plunger type electromagnet device of the present invention adjusts the distance between the movable core and the yoke as appropriate using the adjustment screw made of non-magnetic material. In addition, (b) it is possible to ensure versatility with a single configuration, and it is possible to realize remarkable effects such as distantly reducing costs.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the plunger type electromagnet device of the present invention, FIG. 2 shows an explanatory diagram of its operation, and FIG. 3 shows an example of its application. DESCRIPTION OF SYMBOLS 1... Plunger type electromagnet device, 2... Cylindrical yoke, 3... Fixed iron core, 4... Movable iron core, 5... Return spring, 6...Adjustment screw, 7...Drive coil.

Claims (1)

[Scope of utility model registration request] a fixed core, a movable core whose one end face faces the fixed core via a return spring, a drive coil disposed around the fixed core or the movable core, and other end faces of the fixed core and the movable core. A plunger type electromagnet device comprising: a yoke that magnetically connects the movable iron core; and an adjustment screw made of a non-magnetic material that adjusts the distance between the other end surface of the movable iron core and the yoke.