Patent ID: 11859498
Assignee: NUOVO PIGNONE TECNOLOGIE-SRL
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  B | IPC B  F

Claim 0:
1. A device configured to seal a circumferential gap of a turbomachine between a first turbomachine component and a second turbomachine component which is rotatable relative to the first turbomachine component about a longitudinal axis, the device comprising:
a first sealing element connected to the first turbomachine component; and
a second sealing element coupled to the first sealing element,
wherein the second sealing element has an inner part and an outer part, the inner part of the second sealing element having a plurality of projections extending towards the second machine component to define teeth of a labyrinth seal between a high pressure region and a low pressure region of the turbomachine, the outer part of the second sealing element being elastically coupled with the first sealing element to allow the distance between the first sealing element and the second sealing element to vary depending on fluid dynamic forces acting on the turbomachine components,
wherein one or more pressure chambers are located between the first sealing element and the second sealing element and configured to be in fluid communication with a processing fluid of the turbomachine to derive from such fluid communication a force acting on the outer part of the second sealing element in a direction of gap closure, and
further comprising,
a first stopper element and a second stopper element, the first stopper element to limit the movement of the second sealing element away from the first sealing element towards the second turbomachine component to set a threshold for gap closure and the second stopper element to limit movement of the second sealing element towards the first sealing element,
wherein the first sealing element has a circumferential notch for receiving a corresponding circumferential protrusion of the second sealing element, the circumferential notch and the circumferential protrusion having a first set of corresponding inclined abutment surfaces limiting the excursion of the protrusion in the notch in the radial direction to form the first stopper element, and
wherein the first sealing element and the second sealing element having a second set of corresponding inclined abutment surfaces that mate with one another to form the second stopper element disposed radially above the first stopper element.