Refrigerant system

• US 7,251,949 B2
• Filed: 02/08/2005
• Issued: 08/07/2007
• Est. Priority Date: 02/09/2004
• Status: Expired due to Fees

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Yamanaka, Masaji, Yamasaki, Haruhisa, Matsumoto, Kenzo, Ishigaki, Shigeya, Futakawame, Midori
• Primary Examiner(s): Tapolcai; William E.
• Application Number:
  US11/053,200
• Publication Number:
  US 20050217296A1
• Time in Patent Office: 910 Days
• Field of Search: 62246-256, 625/13
• US Class Current: 62/255
• CPC Class Codes: F25B 1/04 with compressor of rotary type F25B1/005, F25B1/10 take precedence
• CPC Class Codes: F25B 1/10 with multi-stage compression with cascade operation F25B7/00
• CPC Class Codes: F25B 2309/061 with cycle highest pressure above the supercritical pressure
• CPC Class Codes: F25B 40/00 Subcoolers, desuperheaters or superheaters
• CPC Class Codes: F25B 9/008 the refrigerant being carbon dioxide
• CPC Class Codes: F25D 19/02 plug-in type
• CPC Class Codes: F25D 23/003 for cooling refrigerating machinery
• CPC Class Codes: F25D 23/061 with conduit means
• CPC Class Codes: F25D 2317/0651 through the bottom
• CPC Class Codes: F25D 2317/0661 from the bottom
• CPC Class Codes: F25D 2317/0684 the fans allowing rotation in reverse direction
• CPC Class Codes: F25D 2323/00264 through the front bottom part
• CPC Class Codes: F25D 2323/00271 from the back bottom

Abstract

A refrigerant system 1D comprises a heat insulating housing 3 provided with an accommodating space inside and a refrigeration unit 9 attached to a lower portion of the heat insulating housing 3, in which a compressor 5, a gas cooler 6, an internal heat exchanger 10, a restriction means 16 and an evaporator 8 accommodated in a heat insulating case 7A are disposed on a unit base 4. The gas cooler 6 and the heat insulating case 7A are disposed so that air heat-exchanged by the gas cooler 6 moves toward the heat insulating case 7A, an air passage T is provided between the unit base 4 and the heat insulating case 7A, the air heat-exchanged by the gas cooler 6 is passed through the air passage T to be discharged outside, and the internal heat exchanger 10 is disposed in such a manner that it is embedded in a heat insulating material layer 7C provided around the heat insulating case 7A to be provided with a heat insulation property. Accordingly, exhaust heat-exchanged by the gas cooler is discharged outside without stagnation, and increases in an overload and operation power of the compressor are suppressed and the durability of the compressor can be improved. Further, the heat-exchanging efficiency of the internal heat exchanger can be improved and the generation of condensation on a surface of an outer side tube of the internal heat exchanger can be prevented.

Claims

1. A refrigerant system comprising:

a heat insulating housing provided with an accommodating space inside, and

a refrigeration unit attached to a lower portion of said heat insulating housing,

wherein a compressor, a restriction means, an evaporator accommodated in an insulation case, and an internal heat exchanger placed within a wall of the insulating case are disposed on a unit base, and

a refrigeration circuit is formed by sequentially connecting said compressor, said gas cooler, said internal heat exchanger, said restriction means and said evaporator,

wherein said gas cooler and said insulating case are disposed so that air heat-exchanged by said gas cooler moves toward said heat insulating case, and an air passage is provided between said unit base and said heat insulating case by a plurality of supporting columns on the unit base at intervals and on which the heat insulating case is set whereby air heat exchanged by said gas cooler is passed through said air passage to be discharged outside.

3. A refrigerant system according to claim 1, wherein at least one exhaust passage is provided at a place of said unit base corresponding to a portion of said air passage, through which most of air heat-exchanged by said gas cooler and the air heat-exchanged by said gas cooler is passed through said exhaust passage to be discharged outside.

4. A refrigerant system according to claim 1, wherein said refrigeration unit is formed for being detachable and attachable.

5. A refrigerant system according to claim 1, wherein carbon dioxide, which exhibits super critical pressure on the high pressure side, is used as a refrigerant and a two-stage compressing rotary compressor is used as said compressor.

8. A refrigerant system according to claim 3, wherein said refrigeration unit is formed for being detachable and attachable.

11. A refrigerant system according to claim 3, wherein carbon dioxide, which exhibits super critical pressure on the high pressure side, is used as a refrigerant and a two-stage compressing rotary compressor is used as said compressor.

12. A refrigerant system according to claim 4, wherein carbon dioxide, which exhibits super critical pressure on the high pressure side, is used as a refrigerant and a two-stage compressing rotary compressor is used as said compressor.

15. A refrigerant system according to claim 8, wherein carbon dioxide, which exhibits super critical pressure, on the high pressure side, is used as a refrigerant and a two-stage compressing rotary compressor is used as said compressor.

2. A refrigerant system comprising a heat insulating housing provided with an accommodating space inside, and a refrigeration unit attached to a lower portion of said heat insulating housing, wherein a compressor, a gas cooler, an internal heat exchanger, a restriction means and an evaporator accommodated in an insulating case are disposed on a unit base, and a refrigeration circuit is formed by sequentially connecting said compressor, said gas cooler, said internal heat exchanger, said restriction means and said evaporator,

wherein said gas cooler and insulating case are disposed so that air heat-exchanged by said gas cooler moves toward said heat insulating case, and an air passage is provided between said unit base and said heat insulating case whereby air heat-exchanged by said gas cooler is passed through said air passage to be discharged outside, and

said internal heat exchanger and

or said restriction means are provided in such a manner that they are embedded in a heat insulating material layer provided on an outer periphery of said heat insulating case for providing a heat insulation property.

6. A refrigerant system according to claim 2, wherein at least one exhaust passage is provided at a place of said unit base corresponding to a portion of said air passage, through which most of air heat-exchanged by said gas cooler and the air heat-exchanged by said gas cooler is passed through said exhaust passage to be discharged outside.

7. A refrigerant system according to claim 2, wherein said refrigeration unit is formed for being detachable and attachable.

9. A refrigerant system according to claim 6, wherein said refrigeration unit is formed for being detachable and attachable.

10. A refrigerant system according to claim 2, wherein carbon dioxide, which exhibits super critical pressure on the high pressure side, is used as a refrigerant and a two-stage compressing rotary compressor is used as said compressor.

13. A refrigerant system according to claim 6, wherein carbon dioxide, which exhibits super critical pressure on the high pressure side, is used as a refrigerant and a two-stage compressing rotary compressor is used as said compressor.

14. A refrigerant system according to claim 7, wherein carbon dioxide, which exhibits super critical pressure on the high pressure side, is used as a refrigerant and a two-stage compressing rotary compressor is used as said compressor.

16. A refrigerant system according to claim 9, wherein carbon dioxide, which exhibits super critical pressure on the high pressure side, is used as a refrigerant and a two-stage compressing rotary compressor is used as said compressor.