DE383687C - Mercury switch operated by electrical heating - Google Patents

Description

ISSUED
ON OCTOBER 16, 1923

REICH PATENT OFFICE

PATENT LETTERING

- JVs 383687 CLASS 21c GROUP 33

(B 103826

Bavarian electricity industry Rott & Co. in Munich
and Aart Pieter Visser in Rotterdam.

Mercury switch operated by electrical heating.

Patented in the German Empire on March 4, 1922.

With Ouecksilherschaltern, which by electrical Acting heating, there is the disadvantage that the displacement of the mercury by electrical heating of a pressure medium takes place faster than the return of the mercury in the rest position due to the cooling. Accordingly, it takes place power interruption corresponding to the former process faster than restarting.

In order to remedy this disadvantage, it was proposed that the switch housing or the mercury space to make so that the pressure medium during the heating period of the one on the other side animal mercury filling can flow, so that changing pressure loads arise, which accelerate the return of the mercury filling in di Able to produce final position. This pressure medium compensation takes place but never so precisely that the d-cr switch always works with the same reliability. It will be nacl some switching operations a shift of the pressure medium has taken place, di ' ile switch to say.

In order to avoid this, the switch according to the invention is the ouecksilberraun on the unheated side by an> elastic or elastic movable wall al) closed, which bend or sag under the pressure of the displaced mercury

COPV

Claims (3)

can shift and thus get into a state of relaxation, which changes after Switching off the heating as additional pressure in the sense of the return of the mercury filling in the final position, .so that the switch closes faster than when it would only have to have the primary effect of cooling. The drawing shows an embodiment of the invention schematically in section, in Fig. Ι with a closed circuit and in Fig. 2 with an interrupted circuit. The switch consists of a U-shaped bent tube a, the ends of which merge into two approximately equally sized, closed vessels b and c . The whole body can e.g. B. consist of glass. The tube α opens into the vessel b with a nozzle d . made of fire-resistant fabric, e.g. E. Quartz, exists to be resistant to electrical interruption fire. With a little distance above this nozzle d , a plug e is inserted into your vessel b , which comes from a disturbance, e.g. B. Asbestos, ■ which is suitable to allow a gaseous or thin liquid agent to pass through, but is impervious to mercury. At the upper end of this vessel b , an electrode / is inserted, which merges into a heating element g , which penetrates the plug e and is in a conductor insensitive to mercury, e.g. B. iron wire h, ends. An electrode i, likewise made of a conductor that is insensitive to mercury, is inserted into the tube α as a second pole. In the vessel c is a membrane or an elastically displaceable wall k as a seal against the tube a approximately at the level of the plug c. ■ / .. B. a rubber skin drawn over a ring /, inserted tightly, which can expand or shift to equalize pressure, but remains tight against mercury as well as against other liquid or gaseous agents. The vessels b and c are filled above the plug c or the wall k with a heat-expandable gaseous or liquid agent: the tube α contains mercury, which is in both legs up to zn the terminations c and k , so that the Inlet nozzle d cup-shaped enclosing lower part of the vessel h is filled with mercury. In the de-energized state, the filling is in the equilibrium state shown in Fig. 1. If current flows through the switch from pole f to pole /, the contents of the expansion vessel /> heats up, (leans out and penetrates the closing plug c and exerts a certain pressure on the silver filling The increase in pressure caused by the increase in pressure, which must be predefined in advance, displaces the mercury thread to a great extent, so that the mercury thread is torn off at the connector d and the current flow is interrupted (Fig. 21) The interruption of the current results in the gradual cooling of this vessel and its contents and its volume reduction, so that the mercury filling can flow back into the short-circuit position as shown in Fig k much faster than cooling alone would bring about The mercury filling through plug c and wall k makes the switch safe for transport and insensitive to poor plumbing. Pat κ XT-A χ s PRr c he: i. Mercury switch operated by electrical heating with a double 85 ' pelumous, U-shaped mercury container is connected to a pressure medium vessel on both sides, one of which is electrically U-heatable, characterized in that between the mercury filling and an elastically flexible wall for the unheated pressure medium vessel (Y) i'Am is arranged. the through the under The mercury displaced by the heating effect gets into a state of tension with ler Result of a pressure effect in the sense of returning the mercury to the rest position. 2. mercury switch according to claim 1, characterized in that the elastic wall ilc) sits directly above the mercury level located in the equilibrium position and that as a conclusion to the heatable pressure medium space i7>) at the same level a permeable to the pressure medium, for the oueck - • silver but impermeable wall arranged around is. 3. mercury switch according to claim 1 and 2, characterized in that the larger space of the mercury ulcer with a connecting piece made of quartz or the like protrudes into the second smaller room from below. 1 sheet of drawings.