DE520808C - A liquid electric motor with a vertical shaft, the stator and rotor space of which are separated by a suspended cylinder made of thin, electrically poorly conductive metal - Google Patents

Description

Against the penetration of the liquid under a certain overpressure into the inside of the submerged engine are specially designed stuffing boxes and the Filling the inside of the engine with oil or with compressed gas has been suggested.

But there are also known designs in which the protection of the motor against penetration Liquid, especially if it is to be used by clumsy consumers, reached in another way will. For example, that interior of the engine in which the stator is housed is closed by a jacket of very thin nickel or other suitable sheet metal. The mentioned Sheet metal jacket received a special shape, namely the shape of a pot with very thin walls.

ao According to the invention, the support bearing of the anchor is now installed in the above-mentioned pot. The outer liquid penetrates into the pot, which creates a greater tension than the gas (air) that is trapped in the interior of the engine. This will the outer wall of the pot is stretched with a force, i.e. kept smooth, that of the surface corresponds to the cross section of the pot.

The invention is illustrated in the accompanying drawing.

Fig. Ι is a longitudinal section through the engine;

Fig. 2 shows the pot used.

ι is the housing of the motor in which the stator package 2 and the winding 3 in a well-known Way are housed. 4 is a known, seamlessly welded jacket made of nickel or some other, poorly electrically conductive sheet metal that is connected to the Edge 5 and the bottom 6 is welded or otherwise tightly connected. In the bottom 6 is the bearing 7 housed for the rotor shaft. The edge 5, which is in a corresponding Turning 8 of the motor housing inserts, is screwed through the pump housing 9 against the Housing sealed. The bottom 6 is in a corresponding recess 10 in the motor housing introduced. Between the lower part of the bottom 6 and the bore 10 of the There is always sufficient clearance between the housing. If the engine is below the liquid level sunk, the liquid also enters the rotor space and thus into the interior of the Pot 4, 5, 6 a. Since when lowering the pump in the interior of the engine at most

atmospheric tension will prevail according to the immersion depth of the Pump creates an overpressure in the pot space, which is used to tension and maintain the cylindrical Shape of the thin sheet 4 is used. To get the tightening even at very low levels To force liquid level, according to the invention, if necessary, the engine compartment fully or partially evacuated. To this end is an unsigned, in itself known valve provided in the jacket of the engine, to which a pump for suction can be connected to the air. Also the dead weight of the anchor or an artificially generated axial force, for example by the gap pressure on the different large surfaces of the impeller communicating with the outside or by magnetic pull can be achieved in a known manner

ao can, according to the invention for Tightening of the cylinder can be used.

Claims (2)

Patent claims: 1. Vertical shaft electric motor working under liquid, its Stand and barrel space thanks to a suspended cylinder made of thin, electric poorly conductive metal are separated, characterized in that the The lower part of the suspended cylinder is designed as a bearing that supports the rotor carries and absorbs the forces acting on him in the axial direction and so, there it can move in the axial direction, tensioning the cylinder. 2. Electric motor operating under liquid according to claim 1, characterized in that that the stand space is made evacuated in order to prevent the tightening achieved according to the invention of the cylinder is lost when heated. 1 sheet of drawings