SU750604A1 - Gas generating arc-extinguishing device - Google Patents

Description

(54) MOTOR DIGITAL DEVICE

one

The invention relates to electrical engineering in terms of the design of autogas arcing devices designed to protect power equipment.

The autogas arcing device is known, which contains a cartridge made of solid insulating gas generating material with a metal cap screwed onto it 1. Inside the cartridge there are two electrodes connected by a fusible insert. The cartridge is open on one side and closed on the other. The closed portion of the cartridge is a plug that is screwed into the end cap, in which the pin is attached.

It is also known to have an autogas arcing device containing a cartridge consisting of two gas-generating tubes interconnected by a body of a transverse gas blowing pipe 2. One end of the cartridge has a metal end into which a plug is screwed into the thread, simultaneously and a contact terminal having an electrical the connection with the electrodes of the cartridge and the fusible insert located in the zone of the transverse branch pipe blowing.

However, in the known arc-suppressing devices, the damageability of the fuse-links is very high during charging (assembly) of the cartridges, which leads to false shutdowns. In addition, electric motors are damaged due to

 long non-phase modes with false burnout of the fuse-link in one of the cartridges of a three-pole arcing device. High damage of fuse-links of these devices

10 is caused by a defect in the design of cartridges leading to the charging of cartridges to repeated twisting of the fusible inserts, to the disruption of their geometric shapes and mechanical damage to the insert, which reduces the rated current of the fusible inserts and their ampere-second characteristics.

The closest in technical essence to the invention is drawn in by an autogas arcing device, which consists of a gas-generating cartridge, open

20 on one side and closed on the other 3. The cartridge is closed with a stopper screwed on the thread into the steel metal head of the cartridge. In the metal tube is fixed contact terminal of non-ferrous metal. The chuck is attached to the chuck using an adhesive composition and a locking screw. Inside the cartridge are current-carrying electrodes electrically and mechanically connected to the contact plug and fusible insert. The disadvantage of this device is that the damage to the fuse-link during charging (assembling) the cartridge is high, leading to a change in its initial characteristics. This is due to the fact that the current-carrying part of the cartridge, consisting of current-carrying electrodes, the fusible insert and the plug connected to them, is inserted inside the cartridge and rotates until the plug is fully screwed into the metal end cap. In this case, the freezing of the freezing of the current-carrying electrodes located below the fuse-link, closer to the open end of the cartridge, leads to a twist of the body of the fuse-link, i.e., to its tearing and changing the geometric shapes. And all this leads to a deterioration of its electrical and protective characteristics. The situation is aggravated by the fact that ordinary copper or steel wire is used to charge the cartridge, which is tied to the arrow-shaped end of the lower electrode. This assembly is pulled out of the chuck's plane after the screw is fully tightened. Therefore, in the process of charging due to friction on the surface of the inner cavity of the tube, the node places the synchronous rotation of the lower electrode with the screw-in plug, which leads to complete or partial mechanical destruction of the fuse-link. The aim of the invention is to increase the reliability of the arc-suppressing device by eliminating the mechanical disturbances of the fuse-links during assembly (charging) of the device. This goal is achieved by the fact that in a known arc-suppressing device having a gas-generating cartridge, a metal head with a stopper and current-carrying electrodes, the stopper and the head have conical contiguous surfaces made with a taper of 1: 2-1: 5 and the stopper is pressed against the head of the head equipped with a central hole for the contact output, in the protruding part of the lid of which a through transverse hole is made. Fastening the cork in the metal cap with the help of a cap eliminates the rotational movement of the cork and the current-carrying electrodes connected to it, which prevents mechanical damage to the fuse-link. Conical contiguous surfaces help the self-installation of the plug and ensure the sealing of the surface. The magnitude of the taper was chosen experimentally because of the condition that the plug is sufficiently compacted and self-sticking. In order to better seal the plug and cap, a flat gasket may be installed between them. For a better passage of the electrodes through the internal cavity of the cartridge, a threaded hole is made in the outer tip of the lower electrode to fasten the charging handle to avoid sticking of the electrode in the channel of the arcing device. FIG. 1 shows the described device; in fig. 2 - a junction with a stopper. The device comprises a tube 1 made of a solid insulating gas-generating material, a metal tip 2, a plug 3, a current-carrying part consisting of a contact plug 4, a flexible link 5, an upper movable electrode 6, a fusible insert 7 and a lower movable electrode 8. At the location of the fusible insert on the tube 1, the cross-gas blowing pipe 9 is fitted and rigidly fixed. The retracting spring 10 in its extended position is held by a pin 11, which is passed through electrode 8. The contact plug 3 is provided with a transverse hole 12. The plug 3 is snugly attached to the end piece 2 along an annular conical surface 13. The mechanical attachment of the plug 3 is made using a cover 14 screwed on on the head 2 on the thread. Two holes are used for screwing in the cover. A gasket 15 is installed between the lid and the stopper 3. An eyelet 16 is used to attach the cartridge to the electric circuit insulators. For the charging handle, a threaded hole 17 is made in the arrow-shaped end of electrode 8 of the device. The device is charged as follows. The assembled current-carrying part of the cartridge is inserted into the assembled case of the cartridge consisting of the end cap 2, the tube 1 and the socket 8, from the end of the end cap. It consists of a plug 3 mechanically and electrically interconnected (with a pin 4), a flexible link 5, an upper 6 and a lower 8 electrodes with a fusible insert Z In the hole 17 of the electrode 8 screwed in by a charging knob made in the form of a rod. By acting on the charging handle, the spring 10 is stretched, the electrode 8 is pulled out and fixed in the withdrawn (in charged) position by the pin 11. Thereafter, the charging handle is unscrewed from the opening 17. Thus, the cartridge is charged without rotating connection, which excludes mechanical damage

Claims (2)

The claims _<0 1. An autogas extinguishing device containing a gas-generating cartridge, a metal ogolovnik with a plug, a contact terminal and current-carrying electrodes connected to each other by means of a 15 fusible insert, characterized in that, in order to increase the reliability of operation, the plug and ogolovin are made with contacting surfaces, with taper in the range of 1; 2-1: 5, the cork is equipped with a cap pressing it, which is mounted on the headband and has a central hole for contact output, and in the part of the contact Water has a through transverse hole. 2. The device according to π. 1, characterized in that, between the cork and the lid is installed a gasket.