US 12,281,709 B2
Piston ring and booster pump
Motoshi Harada, Tokyo (JP); Kenji Nakamichi, Tokyo (JP); Yuichi Kihara, Tokyo (JP); Kimihiko Mitsuda, Tokyo (JP); Hideaki Asai, Tokyo (JP); Jun Fukada, Tokyo (JP); and Daisuke Hirayama, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP); and KABUSHIKI KAISHA RIKEN, Tokyo (JP)
Appl. No. 18/706,912
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP); and KABUSHIKI KAISHA RIKEN, Tokyo (JP)
PCT Filed Jun. 15, 2022, PCT No. PCT/JP2022/024036
§ 371(c)(1), (2) Date May 2, 2024,
PCT Pub. No. WO2023/079784, PCT Pub. Date May 11, 2023.
Claims priority of application No. 2021-181938 (JP), filed on Nov. 8, 2021.
Prior Publication US 2024/0337316 A1, Oct. 10, 2024
Int. Cl. F16J 9/24 (2006.01)
CPC F16J 9/24 (2013.01) 7 Claims
OG exemplary drawing
 
1. A piston ring to be attached to a piston, the piston being formed in a cylindrical shape along an axis and configured to reciprocate along the axis to compress a fluid, the piston ring comprising:
a low-pressure side ring inserted in a groove formed in an outer circumferential face of the piston, formed in an annular shape extending in a circumferential direction about the axis, and having a low-pressure side abutment; and
a high-pressure side ring inserted in the groove, formed in an annular shape extending in the circumferential direction, and having a high-pressure side abutment,
wherein the low-pressure side ring and the high-pressure side ring are arranged stacked in a direction along the axis so that the high-pressure side ring is closer to a fluid to be compressed,
wherein a low-pressure side rotation restriction part configured to restrict rotation in the circumferential direction relative to the piston is formed on the low-pressure side ring, the low-pressure side rotation restriction part being arranged at a position different from the low-pressure side abutment in the circumferential direction,
wherein a high-pressure side rotation restriction part configured to restrict rotation in the circumferential direction relative to the piston and a low-pressure side protrusion protruding toward the low-pressure side ring and inserted in the low-pressure side abutment are formed on the high-pressure side ring, the high-pressure side rotation restriction part and the low-pressure side protrusion being arranged at a position different from the high-pressure side abutment in the circumferential direction, and
wherein the low-pressure side protrusion is inserted in the low-pressure side abutment with clearances being provided in both sides in the circumferential direction between the low-pressure side ring and the low-pressure side protrusion.