RU2675596C1 - Method of electric motor operation under water - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to the field of electrical engineering, to surface and underwater technology and robotics. Purpose is achieved by continuously maintaining the equality of pressures inside and outside the dense cavity containing the electric motor. Etched out of a dense cavity, the gas during the ascent of the engine is compressed by a compressor mounted on the engine shaft, and the compressed gas is sent to the gas cylinder. When a dense cavity is immersed, compressed gas is fed into a dense cavity from a cylinder.

EFFECT: technical result consists in the possibility of long-term operation of conventional electric motors of general industrial series under water, with the possibility of their self-ventilation with an unlimited number of cycles of immersion depth change, saving compressed air and energy for its production, in the absence of a unmasking factor in the form of a bubble track in water.

1 cl, 1 dwg

Description

The invention relates to the field of surface and underwater equipment and robotics containing electric motors of industrial series installed inside a dense cavity, including electric motors with self-ventilation, subject to emergency flooding, capable of continuing to work for a long time at variable depths of immersion.

There is a known [1] method of operating an electric motor under water (analogue 1), comprising flooding a dense shell with an electric motor located inside it through an opening in the lower part of the dense shell, compressing the air cushion and increasing the air pressure inside said shell communicating with the internal cavity of the engine through the opening in its upper part, equalization of air pressure in the internal cavity of the engine with external pressure inside the dense shell. The disadvantage of this method is the flooding of a dense shell at great depths of immersion with the possibility of water entering the internal cavity of the engine with rolls and trim.

There is a known [2] method of operation of a vertical air-filled submersible electric motor (analogue 2), comprising supplying compressed gases to the dense cavity of an immersed engine, displacing water entering the engine, followed by etching of expanding gases through an opening in the lower part of the pop-up engine. The disadvantage of this method is the impossibility of air cooling of common industrial self-ventilated engines, unproductive consumption of compressed gases.

The closest in combination of features is [3] the method of operation of an air-filled self-ventilated electric motor cooled by air or liquid medium (prototype), comprising supplying compressed gases to an immersed dense cavity with an electric motor located inside it, balancing the air pressure inside the dense cavity with external water pressure, etching excess gases through the hole in the lower part of the dense cavity when it emerges.

The disadvantage of this method is the continuous etching of gases, the need for their constant replenishment from an external surface source in the event of multiple changes in the engine immersion depth, high energy consumption for gas compression, a unmasking factor in the form of a “bubble wake” in water.

The basis of the invention is the task of finding such a method of working under water a conventional electric motor of a common industrial series, repeatedly changing the immersion depth, which does not require a surface gas source of high pressure, reduces the energy consumption for gas compression and eliminates the unmasking factor in the form of a "bubble wake" in water.

This is achieved by means of the fact that the gas etched from the dense cavity is compressed by a compressor mounted on the engine shaft, and the compressed gas is sent to the gas cylinder, and when the dense cavity is immersed, the compressed gas is supplied from the cylinder into the dense cavity.

An example implementation of a method of operating an electric motor under water is shown in FIG. 1. An electric motor 1 with a magnetic seal of the working shaft 2 is installed inside the dense cavity 3. The other end of the motor shaft is connected to the compressor using an automatic coupling 4. An air switching valve 6 connects the dense cavity to the compressor discharge pipe and to the air cylinder 7. Etching valve 8 connects the dense cavity to the compressor suction pipe.

The device operates as follows. When the dense cavity 3 is immersed, the pressure of the water outside the cavity becomes greater than the air pressure inside the cavity, there is a danger of decompression of the working shaft 2, water entering the dense cavity and flooding of the engine 1. In this case, the switching valve 6 automatically releases air into the dense cavity 3 of cylinder 7. When equalizing the air pressure inside the dense cavity with the external water pressure, the switching valve 6 closes, and the air supply stops. When the dense cavity emerges, the air pressure inside the cavity 3 becomes greater than the water pressure outside the cavity, the etching valve 8 is automatically opened, the coupling 4 is turned on, which drives the compressor 5 from the working engine 1. At the same time, the switching valve 6 connects the compressor pressure line to the air cylinder 7, which is replenished with air from a dense cavity 3.

The advantages of the method are the possibility of long-term operation under water of conventional electric motors of common industrial series with the possibility of self-ventilation with an unlimited number of cycles of changing the depth of immersion, saving compressed air and energy for its production, the absence of a unmasking factor in the form of a “bubble wake” in water.

Literature:

1. Electric motor for working under water, invention, copyright certificate of the USSR AS, author Kuznetsov B.I., No. 62276, 1940

2. Submersible air-filled electric motor of vertical design, invention, patent of Ukraine UA No. 101180 C2, 2013

3. Air-filled self-ventilating motor cooled by air or liquid medium, invention, patent of Ukraine UA No. 102356, 2013

Claims (1)

A method of operating an electric motor under water, comprising supplying compressed gases to an immersed dense cavity with an electric motor located inside it, balancing the air pressure inside the dense cavity with external water pressure, etching excess gases through an opening in the lower part of the dense cavity when it emerges, characterized in that it is etched from a dense cavity, the gas is compressed by a compressor mounted on the engine shaft, and the compressed gas is sent to the gas cylinder, and when the dense cavity is immersed, the compressed gas from the cylinder under dissolved in a tight cavity.

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