The bellows type accumulator reaches the pull-out end of the bellows due to the main pre filling pressure, and the sealing device of the guide device blocks the fluid space outside the bellows. Through the closed fluid volume, the bellows is therefore supported against the pre filling pressure acting from the internal space, and is therefore prevented from being damaged in case the pre filling pressure exceeds the liquid pressure. If there is a temperature change in the operating state, the expansion or contraction of the liquid volume corresponding to the thermal expansion coefficient may cause the bellows to deform. In order to keep this deformation and the stress in the bellows at a critical value that may negatively affect the service life of the bellows.
The corrugated tube accumulator adjusts the gap width to adjust the closed liquid volume to a smaller size. For this type of bellows accumulator, the gap dimension may be less than 1mm The liquid volume is so small that the temperature change is not dangerous even in a large range. Therefore, the energy accumulator according to the bellows type can be advantageously used in aviation applications, in which the high temperature difference must be reliably controlled.
The sealing means on the closure can be retracted with a reduced diameter relative to the guide means. On the shell side, in order to cooperate with the reduced diameter sealing device, a shell wall member having a reduced diameter and forming a sealing surface in the shell may be provided.
At its end facing the fluid interface, the bellows type accumulator closing part has a cover whose convex outer contour follows the inner contour of the accumulator housing in the region of the fluid interface and at least partially abuts the inner contour in one end position. Therefore, in the terminal position, the volume of the fluid does not actually remain in the region of the container housing adjacent to the fluid interface. A shoulder is formed on the inner side of the accumulator housing, and the separation bellows moves toward the shoulder at one end position thereof while closing the fluid interface.
The advantage is that the part is provided with an inclined plane, which terminates conically toward the fluid interface, and the inclined plane forms a blocked fluid transition between the guide device and the sealing device at the end position where the sealing device closes the fluid interface. Here, the tapered surface may form a slope through which the sealing device strikes the protruding sealing surface of the accumulator housing when the end position is reached.
In the bellows accumulator implementation, the guide device of the closed member has a guide ring with a plurality of separate guide sections that are against the inner wall of the accumulator housing at each working position of the separate bellows, and a passage space for the fluid is defined between the separate guide sections. The fluid space outside the bellows is connected to the fluid interface at the working position of the bellows through the channel space of the guide ring.