Accumulator module for hydromechanical spring-loaded drive

A hydromechanical spring-loaded drive comprising:

• an accumulator module for activating a high-voltage power switch, wherein the accumulator module includes:
• a pressure-tight housing;
• an accumulator piston that protrudes into the housing and is axially movable in the housing between a first end of the housing and a second end of the housing, the accumulator piston comprising:
• a head having a first diameter;
• the head comprising a terminal surface facing towards the second end of the housing and a circumference peripherally connected with the terminal surface;
• a guide strip fastened to the circumference of the head, the guide strip having a second diameter greater than the first diameter, the guide strip configured to contact an inner wall of the housing during an operation of the accumulator module to maintain a gap between the circumference of the head and the inner wall, the inner wall having a third diameter greater than the first diameter;
• and
• at least one pressure-relief groove in the head, the at least one pressure-relief groove disposed around the circumference of the head;
• a closure cover that closes the first end of the housing in a pressure-tight manner;
• a pair of connection ducts in the housing, for conveying a highly pressurized fluid to a high-pressure duct located outside the housing, such that the highly pressurized fluid is located in the gap between the inner wall of the housing and the head of the accumulator piston during the operation of the accumulator module, and such that the guide strip is maintained between the second end of the housing and the pair of connection ducts when the accumulator piston is in contact with the first end of the housing;
• and
• a spring accumulator coupled to the piston,
• the guide strip fastened to the circumference of the head in between the terminal surface of the head and the at least one pressure-relief groove, the accumulator piston further comprising a single through-bore comprising an axial bore portion and a radial bore portion, the axial bore portion axially traversing into the terminal surface of the head and extending on a longitudinal axis of the accumulator piston, the radial bore portion radially traversing through the circumference of the head and not traversing into the at least one pressure-relief groove, the axial bore portion substantially perpendicular to the radial bore portion and in fluid communication with the axial bore portion, the axial bore portion configured to allow the highly pressurized fluid to flow between a base of the housing and the radial bore portion, the radial bore portion configured to allow the highly pressurized fluid to flow between the axial bore portion and the pair of connection ducts, and the at least one pressure-relief groove positioned in between the guide strip and the radial bore portion, so as to maintain the pressure-relief effect provided by the at least one pressure-relief groove.

An accumulator module comprising:

• a pressure-tight housing;
• an accumulator piston that protrudes into the housing and is axially movable in the housing between a first end of the housing and a second end of the housing, the accumulator piston comprising:
• a head having a first diameter;
• the head comprising a terminal surface facing towards the second end of the housing and a circumference peripherally connected with the terminal surface;
• a guide strip fastened to the circumference of the head, the guide strip having a second diameter greater than the first diameter, the guide strip configured to contact an inner wall of the housing during an operation of the accumulator module to maintain a gap between the circumference of the head and the inner wall, the inner wall having a third diameter greater than the first diameter;
• and
• at least one pressure-relief groove in the head, the at least one pressure-relief groove disposed around the circumference of the head;
• a closure cover that closes the first end of the housing in a pressure-tight manner;
• and
• a pair of connection ducts in the housing, for conveying a highly pressurized fluid to a high-pressure duct located outside the housing, such that the highly pressurized fluid is located in the gap between the inner wall of the housing and the head of the accumulator piston during the operation of the accumulator module, and such that the guide strip is maintained between the second end of the housing and the pair of connection ducts when the accumulator piston is in contact with the first end of the housing, the pair of connection ducts comprising a first connection duct and a second connection duct that is narrower than the first connection duct,
• the guide strip fastened to the circumference of the head in between the terminal surface of the head and the at least one pressure-relief groove, the accumulator piston further comprising a single through-bore comprising an axial bore portion and a radial bore portion, the axial bore portion axially traversing into the terminal surface of the head and extending on a longitudinal axis of the accumulator piston, the radial bore portion radially traversing through the circumference of the head and not traversing into the at least one pressure-relief groove, the axial bore portion substantially perpendicular to the radial bore portion and in fluid communication with the axial bore portion, the axial bore portion configured to allow the highly pressurized fluid to flow between a base of the housing and the radial bore portion, the radial bore portion configured to allow the highly pressurized fluid to flow between the axial bore portion and the pair of connection ducts, and the at least one pressure-relief groove positioned in between the guide strip and the radial bore portion, so as to maintain the pressure-relief effect provided by the at least one pressure-relief groove.