Pressure compensation device designed for underwater applications

An arrangement comprising:

• a hollow cylinder configured as a drum and defining a central opening configured to guide an actuating shaft of an electronic or hydraulic component, the hollow cylinder defining a plurality of bores;
• and
• a plurality of pressure compensation devices configured to seal a housing with respect to a surrounding seawater region, said housing forming a fluid region, each pressure compensation device arranged in an associated one of the plurality of bores, each pressure compensation device comprising:
• at least one accumulator with a flexible wall region;
• and
• at least one piston accumulator with a displaceable piston,
• wherein the plurality of pressure compensation devices are configured to raise a pressure level of the fluid region at least to the ambient pressure prevailing in the seawater region, and
• wherein each pressure compensation device is constructed in two stages in such a way that the at least one accumulator and the at least one piston accumulator are arranged in series.

A method of using a pressure compensation device comprising:

• pressurizing at least one fluid-filled housing for a hydraulic actuating shaft of one of an electric motor, a pump, and a cylinder compensator with the pressure compensation device to a pressure level that is between 0.5 and 10 bar greater than the ambient pressure prevailing in a surrounding seawater region, the pressure compensation device including:
• at least one accumulator with a flexible wall region, the at least one accumulator defining a first interior space fluidly connected to the seawater region and a second interior space separated from the first interior space by the flexible wall region;
• and
• at least one piston accumulator with a displaceable piston, the at least one piston accumulator having a third interior space fluidly connected to the second interior space and a fourth interior space fluidly connected to the fluid region, the displaceable piston sealing the third interior space from the fourth interior space,
• wherein the pressure compensation device is constructed in two stages in such a way that the at least one accumulator and the at least one piston accumulator are arranged in series.