SU16295A1 - Thermal current limiter - Google Patents

Description

The present invention relates to an electric current limiter based on the bending of a bimetallic plate when heated by an electric current passing through a winding superimposed on the plate, which bending causes the circuit contacts to open. A pin located in the path of movement of the bimetallic plate is used in the named limiter in order to open the circuit contacts.

In FIG. 1 shows a view of a limiter with a partial cut; fzg 2-; scheme of its inclusion.

The bimetallic plate 7 (Fig. 1 and 2) is provided with a winding connected in series in the subscriber circuit and. It is attached to the base with a clip 8. On the path of movement of the plate there is a pin 6f connected to the spring 5, bearing contact 3 at the end. The latter is held in connection with contact 1 by means of a pawl. Contacts 1 and 3 are connected in series to the subscriber circuit and can move away from each other, due to spring 5 being bent, when plate 7 is pressed on pin 6. Spring 14, bent in the middle, provided with an insulated tip 4 at the free end entering the space between contacts 1 and 3 when opened

them, with a view to a known time exposure. When moving the plate 7 to its original position, the tip 4 under the action of the spring 5 moves down. The alarm lavda 11, which is turned on at a certain amount of bending of the plate 7 with a knife-like contact 15 of the switch 10, serves to warn of the approach of switching off the circuit. For a longer time delay, the device is equipped with a heat insulating jacket 16 (Fig. 1). Through the hole 12 (Fig. 2), lead wires are threaded, connected to the appropriate terminator terminals. From terminals 13-13, the current is diverted to the subscriber.

The subject of the patent.

1. A thermal electric current limiter using a bimetallic plate, which is bent when heated, serves to open the circuit contacts, characterized in that in the path of the bimetallic plate 7 there is a pin b fastened to the spring 5, bearing contact 3 at the end, using the pawl 2 held in connection with contact 1 and being able to move away from it, due to the bending of spring 5, when plate 7 is pressed on pin b.

2. The execution form is characterized by BdijHoro in clause 1 of the limiter, characterized in that, in order to prevent the quick short-circuit following it from opening the circuit, it is applied with a closed circuit, the bent spring 14 is bent with a bimetallic plate and fitted with an insulated tip 4 at its free end entering the gap between pins 1 and 3 and opening them and leaving the gap when moving plate 7 to its original position.

3. When characterized in pp 1 and 2, the limiter uses, in order to warn about the approaching moment of the circuit, the signal lamp 11, turned on at a certain amount of bending of the bimetallic plate, 1 with the help of a scraper contact 15 on the key 1.0.

4. When described in pp. 1-3 limits the use, in order to obtain a long time delay, of a heat insulating jacket that is worn on the device.

Fig 1. g

sixteen