Refrigeration machine

Patent metadata

Field	Value
Publication number	US-12078401-B2
Application number	US-202218549224-A
Country	US
Kind code	B2
Filing date	Mar 8, 2022
Priority date	Mar 10, 2021
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

A turbo-Brayton refrigeration machine ( 11 ) includes a first circulation path (L 1 ) in which a first refrigerant circulates, a second circulation path (L 2 ) in which a second refrigerant which is a cooling target circulates, a subcooler ( 22 ) disposed over the first circulation path (L 1 ) and the second circulation path (L 2 ) and configured to have a single heat-exchanging unit, and an expansion turbine ( 21 ) positioned on a primary side of the subcooler ( 22 ) in the first circulation path (L 1 ), in which the pressure ratio of the expansion turbine ( 21 ) is the pressure ratio at which the outlet temperature of the expansion turbine ( 21 ) is higher than a freezing point of the second refrigerant.

First claim

What is claimed is:

1. A turbo-Brayton refrigeration machine, comprising:
a first circulation path in which a first refrigerant circulates;
a second circulation path in which a second refrigerant which is a cooling target circulates;
a subcooler disposed over the first circulation path and the second circulation path and configured to have a single heat-exchanging unit; and
an expansion turbine positioned on a primary side of the subcooler in the first circulation path,
wherein the pressure ratio of the expansion turbine is the pressure ratio at which the outlet temperature of the expansion turbine is higher than a freezing point of the second refrigerant.

2. The turbo-Brayton refrigeration machine according to claim 1 ,
wherein the pressure ratio of the expansion turbine is 2.0 or lower.

3. The turbo-Brayton refrigeration machine according to claim 1 ,
wherein a mixed refrigerant of two or more selected from the group consisting of helium, hydrogen, neon, nitrogen, argon, oxygen, air, and hydrocarbon is used as the first refrigerant.

4. The turbo-Brayton refrigeration machine according to claim 1 ,
wherein the second refrigerant is a liquefied gas having a freezing point of 120 K or lower.

5. The turbo-Brayton refrigeration machine according to claim 3 ,
wherein the first refrigerant contains at least helium.

6. The turbo-Brayton refrigeration machine according to claim 5 ,
wherein a mixing proportion of the helium in the first refrigerant is 20% to 95%.

7. The turbo-Brayton refrigeration machine according to claim 2 ,
wherein a mixed refrigerant of two or more selected from the group consisting of helium, hydrogen, neon, nitrogen, argon, oxygen, air, and hydrocarbon is used as the first refrigerant.

8. The turbo-Brayton refrigeration machine according to claim 2 ,
wherein the second refrigerant is a liquefied gas having a freezing point of 120 K or lower.

9. The turbo-Brayton refrigeration machine according to claim 3 ,
wherein the second refrigerant is a liquefied gas having a freezing point of 120 K or lower.

10. The turbo-Brayton refrigeration machine according to claim 4 ,
wherein the first refrigerant contains at least helium.

Assignees

• Taiyo Nippon Sanso Corp

Inventors

• Ozaki Shinsuke
• Hirai Hirokazu
• Ishii Masaki

Classifications

• F25B9/14 Primary

  characterised by the cycle used, e.g. Stirling cycle · CPC title

• F25B9/006

  the refrigerant containing more than one component (F25B9/004 takes precedence) · CPC title

• F25B9/06

  using expanders (F25B9/10 takes precedence) · CPC title

• F05D2260/213

  by the provision of a heat exchanger within the cooling circuit · CPC title

• F05D2260/20

  Heat transfer, e.g. cooling · CPC title