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US4242877A Expired / Lapsed US ⏱️ 0.0 years remaining

Heat-exchanger element for a freeze drier

Assignee: Individual
•
Filing: 1978-03-08
•
Granted: 1981-01-06
•
Expires: 1998-03-08
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Abstract

Abstract The invention relates to a heat-exchanger element for a freeze drier, which includes an outer pipe for the through-flow of freezing mixture, and an inner pipe, disposed within the outer pipe, for the through-flow of the gas to be dried, and which is characterized by a core pipe, located within the inner pipe, for through-passage of a fluid. The bore of the core pipe may be in communication at at least one end, and preferably at both ends, of the heat-exchanger element with the bore of the outer pipe. A feed pipe for the through-passage of a second fluid is preferably provided at the end of the core pipe. There may be provided between the end of the core pipe on the one hand and two fluid feed pipes on the other hand a valve means of which the core pipe can be placed in communication with one and/or the other feed pipe. The invention also relates to a freeze drier with a gas/freezing mixture heat-exchanger with heat-exchanger elements as aforesaid, and to a process for freeze-drying of gas utilizing such a heat-exchanger.

Inventors

  • 👤 Friedhelm Geerkens

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 09:52
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/0246; B; B01; B01D; B01D53/00; B01D53/26; F28D; F28D7/00; F28D7/10; F28D7/103; F28F19/00; F28F19/006

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 79 words
A heat exchanger element for cooling and drying a gas, said element comprising an outer tube for the through-flow of a freezing mixture, an inner tube disposed within the outer tube for the through-flow of a gas to be dried, and a core tube located within the inner tube for the through-flow of a first fluid component, wherein a feed tube for the through passage of a second fluid component is provided at an end of said core tube.
Claim 2
Dependent Claim 79 words
A heat exchanger element for cooling and drying a gas, said element comprising an outer tube for the through-flow of a freezing mixture, an inner tube disposed within the outer tube for the through-flow of a gas to be dried, and a core tube located within the inner tube for the through-flow of a first fluid component, wherein a feed tube for the through passage of a second fluid component is provided at an end of said core tube.
Claim 3
Dependent Claim 69 words
A heat-exchanger element as set forth in claim 1, including a second feed pipe for through-passage of freezing mixture to said outer pipe, a branch pipe from said second feed pipe, and a valve common to second feed pipe and said branch pipe and adapted to control communication between said second feed pipe and said branch pipe on the one hand and said core pipe on the other hand.
Claim 4
Dependent Claim 31 words
A freeze drier comprising a heat exchanger with heat-exchanger elements according to claim 2, at least one of said heat-exchanger elements being arranged as a helix with a substantially vertical axis.
Claim 5
Dependent Claim 29 words
A freeze drier comprising a heat exchanger with heat-exchanger elements as set forth in claim 2 and which extend substantially in a straight line and parallel to one another.
Claim 6
Dependent Claim 16 words
A freeze drier as set forth in claim 4, in which said heat-exchanger elements extend vertically.
Claim 7
Dependent Claim 16 words
A freeze drier as set forth in claim 4, in which said heat-exchanger elements extend obliquely.
Claim 8
Dependent Claim 33 words
A freeze drier as set forth in claim 3, in which the end of the heat-exchanger element at the lower end of the helix is that to which the freezing mixture is fed.
Claim 9
Dependent Claim 26 words
A freeze drier as set forth in claim 7, including a source for a heating gas and which is in communication with said first-mentioned feed pipe.
Claim 10
Dependent Claim 54 words
A freeze drier as set forth in claim 8, including a controlling device to which said valve is connected and which is in a position to control the valve at determined intervals in such a way that, instead of freezing mixture, the heating gas obtained from freezing mixture is passed through said core pipe.
Claim 11
Dependent Claim 24 words
A freeze drier as set forth in claim 9, in which said controlling device is adapted to switch-over the valve at fixed time intervals.
Claim 12
Dependent Claim 23 words
A freeze drier as set forth in claim 9, in which said controlling device is adapted to switch-over the valve as occasion demands.

References Cited (Backward Citations)

DE6751238U Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-01-06 1984-07-07 1985-01-06 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-01-06 1988-07-07 1989-01-06 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-01-06 1992-07-07 1993-01-06 $7700.00 Window Closed / Lapsed

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