SU38947A1 - Device for warning and indicating overpressure in oil-applied electrical appliances - Google Patents

Description

The present invention consists in constructively designing a device for warning and signaling the occurrence of excessive pressure in oil-filled electrical devices, such as oil switches, transformers, etc.

In FIG. 1 shows a part of an oil switch provided with the proposed device; FIG. 2 and 3 are transverse and longitudinal sections of the device and FIG. 4-cross section of another device.

The contacts and operating mechanisms of the oil switch according to FIG. 1, are enclosed in a closed housing consisting of a tank 7, to which a cover 2 is fastened by means of bolts, carrying insulating sleeves 3 and the casing of the mechanism 4.

The lid 2 has a safety opening of sufficient size, surrounded by a solid vertical flange b, to which the end flange of the pipe 7 is attached. The pipe is discharged to a place where neither hot gas nor oil can cause harm. The pipe 7 may also connect the tank to the said place by means of a common for several switches of the chamber 5. Between the pipe (390)

Battle 7 and flange b the proposed device fO is located (Fig. 2 and 3).

This device has a supporting part / 7 with a circular hole formed by a low annular protrusion 72. Two concave diaphragms M and 75 of spherical shape made of thin sheet metal, for example, carefully annealed copper, are pressed against opposite sides of the protrusion. In order to achieve the best results, the diaphragm must fit tightly against the opening of the supporting part and abut the edges of the protrusion 72 over the entire periphery.

Both diaphragms face each other with concave surfaces and are held in this position by means of a small central bolt J6. In the gas-tight connection of the diaphragms and the protrusion 72 is not necessary.

The proposed method of fastening has the convenience of quickly replacing detached diaphragms with new ones, and also does not interfere with the diaphragm, under the influence of excessive pressure, turn out and be ejected by a jet of gas or liquid.

If the pipe 7 acts independently of the pipes of other switches, then installation in it of only one of the phragm, facing the inside with a convex surface, is sufficient. the switch. If several switches have a common chamber 8, according to FIG. 1, it is necessary to apply a second diaphragm, facing - a convex surface to the chamber, so that the pressure appearing in this chamber, under the action of another switch, does not blow the first / diaphragm inside the switch. Due to the inaccessibility of the diaphragms for observation, the duty officer will not know when the device has been affected.

However, the operation of the device can be caused by damage to the switch, which should be immediately corrected. In addition, the torn diaphragms must be replaced with new ones. Therefore, the duty officer must have a signal about the operation of the device. For this, between the two diaphragms (Figs. 1 and 2) is placed a rod T8 of brittle material, with its ends being part of the supporting diaphragm part //. This rod breaks and is carried away by the diaphragms at the separation of the latter. An example of fastening the rod, allowing it to be easily replaced, is that the latter is inserted at one end into the hole on the thread of the screw head 19, the other passes through the hole in the same head 20, and protrudes outward. Part 7 / is attached to the insulating lining 2 / spring contact 22, abutting against the end of the rod 18. There is a contact 24 on the same lining 23. Spring contact 20 is kept from contact with contact 24 by the protruding end of the rod 18. Contacts 22 and 24 can be any alarm device is connected, for example, an electric bell.

If desired, this device may include a device that prevents the switch from being turned on again until the desired moment. While the diaphragms and the fragile rod occupy the normal position, contacts 22 and 24 (Fig. 2) are open, but as soon as the diaphragms are torn off, the crowbar and the ash are removed, the spring contact 22 closes the signal device circuit, and the latter gives a signal / ton. In view of the fact that the installation of the bolt 16 in the center of the diaphragm is more appropriate, the brittle rod may be slightly shifted toward the center. If necessary, signaling can be done by opening, rather than closing, the pointer circuit, as described in the above pattern. For example, in a modified device (Fig. 4), the rod 18 is replaced by a thin wire of easily torn conductive material, similar to a low-melting metal. This wire is supported in a fragile tube 28 made of glass or rubber, which can be fixed in the supporting part. The ends of the wires are connected to the contacts 29 and 30, on insulating pads attached to the supporting part / 7. In the circuit containing the 2Pi 30 contacts, the relay coil 57 is turned on, which in normal conditions is energized. The relay is equipped with contacts closing the circuit that contains the alarm bell 32. In this case, under normal conditions, the current passes through the safety wire and the relay winding. When the diaphragms are torn off, the wire is broken, the operating coil circuit of the relay is opened, the circuit is turned off and, closing the signal circuit, gives an alarm signal.

The subject of the patent.

Claims (2)

1. A device to prevent and indicate excessive pressure in oil-filled electrical devices, characterized in that one or more convex elastic diaphragms are placed in the discharge gas to a safe place, which, under normal pressure in the device to be protected, has a pipe near which a rod of fragile material so that when the diaphragm is deformed by a gas flow, this rod breaks and triggers an electrical signal or safety device (Fig. 2 and 3). 2. The device change according to claim 1, characterized by the use of thin wire instead of a brittle rod, which, when ruptured by the action of diaphragms, opens an electrical relay circuit (Fig. 4). E Patent of the In-th Company Company., International Electricity General La 38947 E to the patent of the company of the company “International Universal Electricity No. В8947