Patent US3908397A successfully refreshed from Google Patents.
US3908397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling system
Assignee: US Philips Corp
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Filing: 1974-03-27
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Granted: 1975-09-30
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Expires: 1994-03-27
Abstract
Abstract A cooling system including a cooling element placed in the space to be cooled and provided with a blocking device comprising a restriction for blocking the flow of cooling fluid through the cooling element in the case of an intolerable temperature rise in said cooled space.
Inventors
- 👤 Gijsbert Prast
- 👤 Jan Mulder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:02
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/002
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
221 words
In a cooling system operable with a source of cooled fluid for refrigerating a closed space, including a cooling element which is situated in said space and through which said fluid is flowable for refrigerating said space, a supply duct for communicating said fluid from said source to said cooling element, a discharge duct for communicating said fluid from said element to said source, and means for circulating said fluid through said system, the improvement in combination therewith, wherein said supply and discharge ducts each comprise a first part extending from said source to said closed space and a second part within said closed space extending to said cooling element, said first part of said supply and discharge ducts having adjacent portions in heat exchange relationship forming a heat exchanger, the improvement being a blocking device comprising said heat exchanger and a fluid flow restriction means in said second part of the supply duct, whereby a heat leak into said closed space causing a temperature rise therein causes heat transfer into fluid in said cooling element and in said discharge duct, and further heat transfer from fluid in said discharge duct to fluid in said supply duct via said heat exchanger, and wherein said restriction means restricts flow in said supply duct of fluid to which said heat has been added.
Claim 2
Dependent Claim
221 words
In a cooling system operable with a source of cooled fluid for refrigerating a closed space, including a cooling element which is situated in said space and through which said fluid is flowable for refrigerating said space, a supply duct for communicating said fluid from said source to said cooling element, a discharge duct for communicating said fluid from said element to said source, and means for circulating said fluid through said system, the improvement in combination therewith, wherein said supply and discharge ducts each comprise a first part extending from said source to said closed space and a second part within said closed space extending to said cooling element, said first part of said supply and discharge ducts having adjacent portions in heat exchange relationship forming a heat exchanger, the improvement being a blocking device comprising said heat exchanger and a fluid flow restriction means in said second part of the supply duct, whereby a heat leak into said closed space causing a temperature rise therein causes heat transfer into fluid in said cooling element and in said discharge duct, and further heat transfer from fluid in said discharge duct to fluid in said supply duct via said heat exchanger, and wherein said restriction means restricts flow in said supply duct of fluid to which said heat has been added.
Claim 3
Dependent Claim
15 words
Apparatus according to claim 1 wherein said restriction means comprises a laminar flow restriction means.
Claim 4
Dependent Claim
15 words
Apparatus according to claim 1 wherein said restriction means comprises a turbulent flow restriction means.
Claim 5
Dependent Claim
45 words
Apparatus according to claim 1 wherein said source of cooling fluid comprises continuous duct means including as parts thereof said supply and discharge ducts, a quantity of helium in said duct means, and a cold gas refrigerator for cooling said helium in said duct means.
Claim 6
Dependent Claim
13 words
Apparatus according to claim 1 wherein said closed space comprises a Dewar flask.
Claim 7
Dependent Claim
136 words
In a cooling system operable with a source of fluid for refrigerating a closed space, including a cooling element which is situated in said space whereby said fluid becomes heated and through which said fluid is flowable for refrigerating said space, a supply duct for communicating said fluid from said source to said cooling element, a discharge duct for communicating said fluid from said element to said source, and means for circulating said fluid through said system, the improvement in combination therewith, comprising first means in said closed space, and second means for transferring heat from said fluid heat in said cooling element to fluid in said supply duct upstream of said space, said first means operable to restrict flow in the supply duct of said fluid when it has been heated by said second means.
Claim 8
Dependent Claim
136 words
In a cooling system operable with a source of fluid for refrigerating a closed space, including a cooling element which is situated in said space whereby said fluid becomes heated and through which said fluid is flowable for refrigerating said space, a supply duct for communicating said fluid from said source to said cooling element, a discharge duct for communicating said fluid from said element to said source, and means for circulating said fluid through said system, the improvement in combination therewith, comprising first means in said closed space, and second means for transferring heat from said fluid heat in said cooling element to fluid in said supply duct upstream of said space, said first means operable to restrict flow in the supply duct of said fluid when it has been heated by said second means.
Claim 9
Dependent Claim
57 words
Apparatus according to claim 6 wherein said second means comprises a heat exchanger formed of adjacent portions of said discharge and supply ducts whereby heat from said fluid when heated in said cooling element is transferred to fluid in said supply duct, which fluid then becomes less dense and flow thereof is restricted by said first means.
References Cited (Backward Citations)
US3350896A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |