Pressure boosting pump and hydrogen supply system

Patent metadata

Field	Value
Publication number	US-2025383047-A1
Application number	US-202318875880-A
Country	US
Kind code	A1
Filing date	Aug 17, 2023
Priority date	Sep 9, 2022
Publication date	Dec 18, 2025
Grant date	—

Abstract

In a pressure boosting pump and a hydrogen supply system, included are a cylinder having a compression chamber, a suction valve configured to cause a low-temperature fluid to be sucked into the compression chamber, a piston movably supported on the cylinder and configured to compress the low-temperature fluid in the compression chamber, a discharge valve configured to cause the low-temperature fluid in the compression chamber to be discharged, and a piston ring provided on an outer periphery of the piston. The piston ring has a piston ring main body positioned closer to an inner peripheral face of the cylinder and an inner ring positioned closer to the center of the piston than the piston ring main body is. The inner ring has a hardness lower than a hardness of the piston ring main body.

First claim

1 . A pressure boosting pump comprising:
a cylinder having a compression chamber; a suction valve configured to cause a low-temperature fluid to be sucked into the compression chamber; a piston movably supported on the cylinder and configured to compress the low-temperature fluid in the compression chamber; a discharge valve configured to cause the low-temperature fluid in the compression chamber to be discharged; and a piston ring provided on an outer periphery of the piston, wherein the piston ring has
a piston ring main body positioned closer to an inner peripheral face of the cylinder, and
an inner ring positioned closer to a center of the piston than the piston ring main body is, and
the inner ring has a hardness lower than a hardness of the piston ring main body.

2 . The pressure boosting pump according to claim 1 , wherein
the piston ring main body is formed of a PEEK-based material having polyetheretherketone as a main component, and the inner ring is formed of a PTFE material having polytetrafluoroethylene as a main component.

3 . The pressure boosting pump according to claim 1 , wherein
the piston ring main body has a high-pressure piston ring main body positioned closer to the compression chamber and a low-pressure piston ring main body positioned on an opposite side of the high-pressure piston ring main body from the compression chamber, and the low-pressure piston ring main body has a hardness of lower than a hardness of the high-pressure piston ring main body.

4 . The pressure boosting pump according to claim 3 , wherein the hardness of the inner ring is less than or equal to the hardness of the low-pressure piston ring main body.

5 . The pressure boosting pump according to claim 3 , wherein
the high-pressure piston ring main body is formed of a PEEK-based material having polyetheretherketone as a main component, and the low-pressure piston ring main body is formed of a PTFE material having polytetrafluoroethylene as a main component.

6 . The pressure boosting pump according to claim 1 , wherein
the piston is formed with an annular groove on an outer periphery, the piston ring main body is disposed at an outermost part of the annular ring in a radial direction, the inner ring is disposed inside the piston ring main body in the radial direction in the annular groove, a backup ring is disposed inside the inner ring in the radial direction in the annular groove, and the backup ring is formed of stainless steel.

7 . The pressure boosting pump according to claim 1 , wherein
the piston ring includes a plurality of piston rings provided spaced apart from each other in a direction in which the piston moves, the piston is provided with a wear ring each on one side and another side of the piston rings in an axial direction, and the wear ring is formed of a PTFE material having polytetrafluoroethylene as a main component.

8 . A hydrogen supply system comprising:
a compression device including the pressure boosting pump according to claim 1 configured to compress liquid hydrogen as a low-temperature fluid; an evaporation device configured to vaporize the liquid hydrogen compressed by the compression device; and a dispenser configured to supply the hydrogen gas vaporized by the evaporation device.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Harada Motoshi
• Nakamichi Kenji
• Kihara Yuichi
• Asai Hideaki
• Mitsuda Kimihiko

Classifications

• F17C2227/0142

  with specified pump type, e.g. piston or impulsive type · CPC title

• F17C2223/0153

  Liquefied gas, e.g. LPG, GPL · CPC title

• F17C2221/012

  Hydrogen · CPC title

• F16J9/26

  characterised by the use of particular materials · CPC title

• F16J9/16

  obtained by stacking of rings · CPC title