US 11,952,941 B2
Compressed air energy storage power generation device
Masaki Matsukuma, Takasago (JP)
Assigned to KOBE STEEL, LTD., Hyogo (JP)
Appl. No. 17/608,697
Filed by KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.), Hyogo (JP)
PCT Filed Mar. 24, 2020, PCT No. PCT/JP2020/013062
§ 371(c)(1), (2) Date Nov. 3, 2021,
PCT Pub. No. WO2020/230455, PCT Pub. Date Nov. 19, 2020.
Claims priority of application No. 2019-089865 (JP), filed on May 10, 2019.
Prior Publication US 2022/0220894 A1, Jul. 14, 2022
Int. Cl. F02C 6/16 (2006.01); F02C 1/02 (2006.01); F02C 7/28 (2006.01)
CPC F02C 6/16 (2013.01) [F02C 1/02 (2013.01); F02C 7/28 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A compressed air energy storage power generation device comprising:
a compressor/expander combined machine that is of displacement type and has a function as a compressor for compressing air and a function as an expander for expanding compressed air;
a motor/generator combined machine that is mechanically connected to the compressor/expander combined machine and has a function as an electric motor for driving the compressor/expander combined machine and a function as a generator driven by the compressor/expander combined machine; and
a pressure accumulator that is fluidly connected to the compressor/expander combined machine and stores compressed air generated by the compressor/expander combined machine, wherein
the compressor/expander combined machine includes
a first casing that defines a compression chamber and is provided with a first through hole,
a first rotating shaft member that is inserted through the first through hole, and
a first seal part that seals a gap between the first rotating shaft member and the first casing in the first through hole; and
the first seal part includes
a lubricant labyrinth seal having a rotationally axisymmetric shape so as not to depend on a rotation direction of the first rotating shaft member, and
two or more of air ring seals disposed, in a direction in which the first rotating shaft member extends, closer to the compression chamber than the lubricant labyrinth seal; and
the compressor/expander combined machine further includes
a first inlet that is provided in the first casing and introduces compressed air into the lubricant labyrinth seal, and
a first air source that is fluidly connected to the first inlet and supplies compressed air to the lubricant labyrinth seal from the compression chamber side via the first inlet.