Dual independent chamber ultra-low temperature freezer
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F25B-005/00
F25B-007/00
출원번호
US-0321584
(2002-12-18)
발명자
/ 주소
Kelly, Allan
Weng, Chuan
출원인 / 주소
GSLE Development Corporation
대리인 / 주소
Baker & Hostetler LLP
인용정보
피인용 횟수 :
11인용 특허 :
6
초록▼
Methods and apparatus for a two chamber freezer whereby both chambers can be maintained at a substantially constant ultra-low temperature, such as within the range of about −40° C. to −80° C. Short term items may be stored in and accessed by the upper door from an upper chamb
Methods and apparatus for a two chamber freezer whereby both chambers can be maintained at a substantially constant ultra-low temperature, such as within the range of about −40° C. to −80° C. Short term items may be stored in and accessed by the upper door from an upper chamber while long term items may be stored in and accessed by the lower door in the lower chamber. The upper and lower chambers are thermodynamically independent of each other thereby reducing the power usage of the freezer.
대표청구항▼
1. A freezer comprising:a cabinet;a first freezer chamber having insulated peripheral walls including a pair of side walls, a rear wall, a top wall and a bottom wall disposed in a top portion of said cabinet;a second freezer chamber having insulated peripheral walls including a pair of side walls, a
1. A freezer comprising:a cabinet;a first freezer chamber having insulated peripheral walls including a pair of side walls, a rear wall, a top wall and a bottom wall disposed in a top portion of said cabinet;a second freezer chamber having insulated peripheral walls including a pair of side walls, a rear wall, a top wall and a bottom wall disposed in a bottom portion of said cabinet;an upper insulated door hingedly secured to one of said side walls of said first freezer chamber;a lower insulated door hingedly secured to one of said side walls of said second freezer chamber; anda refrigeration unit connected to said freezer which cools said first and second freezer chambers to a substantially uniform temperature between about −40° C. and −80° C.,wherein said first and said second freezer chambers are independently controllable and said cabinet further comprises outer vertical doors hingedly secured along said top and bottom portions, respectively and;wherein refigerants R404a and R508b are used in a dual cascade system connected to said first freezer chamber and said second freezer chamber. 2. The freezer according to claim 1, wherein said dual cascade system further comprises:a cascade heat exchanger thermodynamically connected to a high-stage circuit and a split low-stage circuit having a high-pressure refrigerant stream and a low-pressure refrigerant stream,wherein said split low-stage circuit is connected independently to said first freezer chamber and said second freezer chamber. 3. The freezer according to claim 2, wherein said split low-stage circuit comprises:a first circuit having a first evaporator and a first expansion device;a second circuit having an second evaporator and a second expansion device;a refrigeration compression device; andan oil separator,wherein said high-pressure refrigerant stream splits after passing through said oil separator and said low-pressure refrigerant stream recombines after passing through said first and second evaporators. 4. The freezer according to claim 3, wherein said first and second expansion devices are electronic expansion devices. 5. The freezer according to claim 2, wherein said split low-stage circuit comprises:a first circuit having a first evaporator and a first capillary expansion device;a second circuit having a second evaporator and a second capillary expansion device;a refrigeration compression device; andan oil separator,wherein said high-pressure refrigerant stream splits after passing through said oil separator and said low-pressure refrigerant stream recombines after passing through said first evaporator and said second evaporator. 6. The freezer according to claim 5, further comprising:a first solenoid valve connected inline after said high-pressure refrigerant stream splits in said first circuit;a second solenoid valve connected inline after said high-pressure refrigerant stream splits in said second circuit;a third solenoid valve connected inline after said first evaporator; anda fourth solenoid valve connected inline after said second evaporator,wherein said first and second solenoid valves are normally open and said third and fourth solenoid valves prevent migration of refrigerant during single chamber operation. 7. The freezer according to claim 1, wherein said dual cascade system further comprises:a cascade heat exchanger thermodynamically connecting a high-stage circuit and a first and a second low-stage circuit each low-stage circuit having a high-pressure refrigerant stream and a low pressure refrigerant stream. 8. The freezer according to claim 7, wherein said first low-stage circuit and said second low-stage circuit are independently controlled by a temperature controller. 9. The freezer according to claim 1, wherein said dual cascade system further comprises:a cascade heat exchanger thermodynamically connected to a high-stage circuit, a first low-stage circuit and a second low-stage circuit,wherein said first low-stage circuit i s connected to said first freezer chamber and said second low-stage circuit is connected to said second low-stage circuit. 10. The freezer according to claim 9, wherein said first low-stage circuit comprises:a first evaporator and a first expansion control device;a first refrigeration compression device; anda first oil separator. 11. The freezer according to claim 10, wherein said first low-stage circuit comprises:a second evaporator and a first expansion control device;a second refrigeration compression device; anda second oil separator. 12. A method of independently controlling dual freezer chambers, comprising the steps of:providing a dual cascade system having a high-stage and a low-stage circuit, wherein said high-stage circuit includes a compressor, a condenser, and an expansion device;splitting a refrigerant stream after oil separation occurs into a first and a second low-stage circuit;controlling the flow of the split refrigerant stream into a cascade heat exchanger with a first and a second solenoid valve, respectively;passing the split refrigerant stream through a first and a second expansion device and a first and a second evaporator, respectively;controlling the migration of the split refrigerant stream with a third and a fourth solenoid valve, respectively;recombining the split refrigerant stream after passing through said first and said second evaporators; andcompressing the recombined refrigerant stream with a refrigeration compression device. 13. A method of independently controlling dual freezer chambers, comprising the steps of:providing a dual cascade system having a high-stage and a low-stage circuit, wherein said high-stage circuit includes a compressor, a condenser, and an expansion device;splitting a refrigerant stream after oil separation occurs into a first and a second low-stage circuit;passing the split refrigerant stream through a first and a second expansion control device and a first and a second evaporator, respectively;recombining the split refrigerant stream after passing through said first and said second evaporators; andcompressing the recombined refrigerant stream with a refrigeration compression device. 14. An independently controllable dual chamber freezer system comprising:means for splitting a refrigerant stream after oil separation occurs into a first and a second low-stage circuit;means for controlling the flow of the split refrigerant stream into a cascade heat exchanger;means for passing the split refrigerant stream through a first and a second expansion control device and a first and a second evaporator, respectively;means for controlling the migration of the split refrigerant stream; means for recombining the split refrigerant stream after passing through said first and said second evaporators; andmeans for compressing the recombined refrigerant stream. 15. The system of claim 14, wherein said means for splitting is an inline refrigerant flow Y-connector. 16. The system of claim 14, wherein said means for controlling the flow of the split refrigerant stream is a first and a second solenoid valve, respectively. 17. The system of claim 14, wherein said means for controlling migration of the split refrigerant stream is a third and a fourth solenoid valve. 18. The system of claim 14, wherein said means for recombining the split refrigerant stream is an inline refrigerant flow Y-connector. 19. The system of claim 14, wherein said means for compressing is a refrigeration compression device.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (6)
Weng, Chuan; Kelly, Allan, Non-hydrocarbon ultra-low temperature system for a refrigeration system.
Popovitch, Lou Spencer; Bruchs, Christopher Enright; Mangan, Dan Joseph, Removable storage basket and associated methods for storing items within a freezer.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.