US 12,168,276 B2
Sealing device, sealing system, and method for sealing a leakage flow at a machine element
Jürgen Gaydoul, Djursholm (SE)
Assigned to HERMETIK HYDRAULIK AB, Djursholm (SE)
Appl. No. 17/799,989
Filed by HERMETIK HYDRAULIK AB, Djursholm (SE)
PCT Filed Jun. 17, 2021, PCT No. PCT/EP2021/066387
§ 371(c)(1), (2) Date Aug. 16, 2022,
PCT Pub. No. WO2022/262978, PCT Pub. Date Dec. 22, 2022.
Prior Publication US 2024/0181585 A1, Jun. 6, 2024
Int. Cl. F16J 15/40 (2006.01); B23Q 11/00 (2006.01)
CPC B23Q 11/0075 (2013.01) [F16J 15/40 (2013.01)] 18 Claims
OG exemplary drawing
 
1. Sealing device for sealing a leakage flow on a machine element which is circular in cross section of a working machine working with a working fluid under high pressure, wherein the sealing device comprises:
a tubular housing having an upstream end and a downstream end and through which the machine element which is circular in cross section can extend and which is accommodated in a seal housing,
an upstream pressure chamber which is arranged at the upstream end of the tubular housing,
a downstream pressure chamber which is arranged at the downstream end of the tubular housing,
a sealing element which is arranged between the upstream pressure chamber and the downstream pressure chamber and is mounted within the tubular housing and which rests sealingly at least in portions against the machine element moving relative to the sealing element,
a bypass line running around the sealing element, which bypass line is arranged to run at least in portions within the tubular housing and which is designed to fluidly connect the upstream pressure chamber to the downstream pressure chamber, and
a throttle element designed to reduce the pressure of a leakage fluid flowing from the upstream pressure chamber through the bypass line to the downstream pressure chamber by a predetermined pressure difference which is arranged between the upstream pressure chamber and the downstream pressure chamber in the bypass line, wherein the leakage fluid is a part of the working fluid under high pressure, wherein the sealing element and the tubular housing are mounted such that they can be moved relative to one another based on the predetermined pressure difference, wherein the tubular housing includes a support collar directed radially inwards at the downstream end, against which the support collar and the sealing element rests, and
wherein the sealing element has a first support ring, a second support ring, and a sealing member which is arranged between the first support ring and the second support ring, and wherein the second support ring rests against the support collar.