Patent US3735793A successfully refreshed from Google Patents.
US3735793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plate evaporators
Assignee: SPX Flow Technology Crawley Ltd
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Filing: 1971-05-04
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Granted: 1973-05-29
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Expires: 1991-05-04
Abstract
Abstract A plate type evaporator of the falling film type, comprising a pack of plates arranged in spaced face-to-face relationship and gasketed to define flow spaces for heating medium and feed liquid between the plates, characterized in that distribution means is provided to distribute the feed liquid across the flow spaces, the said distribution means comprising at least one restriction leading to a transversely extending distribution zone in communication with one or more flow spaces, the restriction being adapted to cause some flashing of vapor from the feed liquid whereby a mixture of liquid and vapor is present in the distribution zone, the or each distribution zone communicating with the respective flow spaces through a series of laterally spaced further restrictions which are adapted to produce further flashing as the liquid and vapor mixture passes through them.
Inventors
- 👤 R K Burberry
- 👤 R A White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:39
CPC Classifications
F; F28; F28F; F28F3/00; F28F3/08; F28F3/083; B; B01; B01D; B01D1/00; B01D1/22; B01D1/221; F28D; F28D21/00; F28D2021/0019; F28D2021/0061; F28D2021/0066
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
190 words
In a plate evaporator of the falling film type, comprising a pack of vertical plates in spaced face-to-face relationship with gaskets interposed therebetween defining alternating flow spaces for heating medium and feed liquid between adjacent plates, an upper feed liquid supply duct, and distribution means for distributing the feed liquid from the supply duct across the upper portions of the feed liquid flow spaces: the improvement that the distribution means for each feed liquid flow space comprises a transversely extending distribution zone having a feed chamber and a distribution chamber; at least one restriction forming part of a flow path between the feed liquid supply duct and the distribution chamber and being adapted to cause a pressure drop in the feed liquid and some flashing of vapors from the feed liquid, whereby a mixture of liquid and vapor is preSent in the distribution chamber, and a series of laterally spaced further restrictions allowing communication between the distribution chamber and one of the feed liquid flow spaces, said last mentioned restriction being adapted to produce further flashing as the mixture of liquid and vapor passes from the distribution chamber through them.
Claim 2
Dependent Claim
190 words
In a plate evaporator of the falling film type, comprising a pack of vertical plates in spaced face-to-face relationship with gaskets interposed therebetween defining alternating flow spaces for heating medium and feed liquid between adjacent plates, an upper feed liquid supply duct, and distribution means for distributing the feed liquid from the supply duct across the upper portions of the feed liquid flow spaces: the improvement that the distribution means for each feed liquid flow space comprises a transversely extending distribution zone having a feed chamber and a distribution chamber; at least one restriction forming part of a flow path between the feed liquid supply duct and the distribution chamber and being adapted to cause a pressure drop in the feed liquid and some flashing of vapors from the feed liquid, whereby a mixture of liquid and vapor is preSent in the distribution chamber, and a series of laterally spaced further restrictions allowing communication between the distribution chamber and one of the feed liquid flow spaces, said last mentioned restriction being adapted to produce further flashing as the mixture of liquid and vapor passes from the distribution chamber through them.
Claim 3
Dependent Claim
30 words
A plate evaporator as claimed in claim 1, wherein the feed liquid duct feeds all of the feed liquid flow spaces via the distribution zones and their feed distribution chambers.
Claim 4
Dependent Claim
22 words
A plate evaporator as claimed in claim 1, characterized in that the said further restrictions are formed by orifices in the plates.
Claim 5
Dependent Claim
31 words
A plate evaporator as claimed in claim 1, characterized in that the said further restrictions are formed by nozzles set in the gaskets separating the distribution chamber from the flow spaces.
Claim 6
Dependent Claim
24 words
A plate evaporator as claimed in claim 1, wherein each of the distribution chambers feeds at least one of the feed liquid flow spaces.
Claim 7
Dependent Claim
92 words
A plate evaporator as claimed in claim 5, in that the said further restrictions are formed by nozzles set in the gaskets which separate the distribution chambers from the flow spaces for the feed liquid, and in which the feed liquid is fed from the supply duct to feed zones isolated by gaskets from the flow space zones for the heating medium, said feed liquid communicating by orifices in the plates with the distribution zones which are separated by the gaskets with inset nozzles from the flow spaces for the feed liquid.
Claim 8
Dependent Claim
33 words
A plate evaporator as claimed in claim 5, characterized in that the series of orifices feeding into flow space zones for the feed liquid are staggered at opposite sides of the distribution zones.
Claim 9
Dependent Claim
62 words
A plate evaporator as claimed in claim 7, characterized in that the feed liquid is fed from a feed duct to feed zones overlying and isolated by gaskets from the heating medium flow spaces, and communicating by orifices in the plates with the distribution zones which are separated by the gaskets with inset nozzles from the flow spaces for the feed liquid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |