Patent US4453496A successfully refreshed from Google Patents.
US4453496A
Expired / Lapsed
US
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Multitubular once-through boiler
Assignee: Miura Co Ltd
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Filing: 1982-07-30
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Granted: 1984-06-12
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Expires: 2002-07-30
Abstract
Abstract A multitubular once-through boiler which exhibits an excellent heat transfer efficiency and requires a relatively smaller installation area. The multitubular once-through boiler comprises a combustion device, a ring-shaped upper header which functions as a vapor chamber, a ring-shaped lower header which functions as a water chamber, a plurality of vertical water-tubes connecting the upper and lower headers to form a single-row ring-shaped water-tube wall, a combustion chamber which is a cylindrical inner space surrounded by the water-tube wall, and a ring-shaped combustion gas passage formed between the water tube wall and an outer wall of the boiler. The water-tubes each has a spiral channel grooved on the surface thereof and is in contact with adjacent water-tubes. The area next to each two adjacent water-tubes, on the side of the tubes facing the outer wall of the boiler, has a barrier plate disposed in contact with the water tubes. The barrier plate has an approximately V-shaped cross-section corresponding to the configuration of said area. The multitubular once-through boiler may further comprises a partition wall for dividing the cylindrical inner space of the water-tube wall into the combustion chamber and a flue.
Inventors
- 👤 Yuji Yoshinari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:08
CPC Classifications
F; F22; F22B; F22B21/00; F22B21/02; F22B21/04; F22B21/06; F22B21/065; Y; Y10; Y10S; Y10S165/00; Y10S165/903
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
139 words
A multitubular once-through boiler comprising: a ring-shaped upper header; a ring-shaped lower header; a plurality of water-tubes connecting the upper and lower headers and combining to form a water-tube wall, wherein outer surfaces of said water-tubes have a spiral channel grooved therein; a combustion chamber surrounded by the water-tube wall; a combustion device associated with the combustion chamber; a ring-shaped passage formed between the water-tube wall and an outer wall of the boiler; and a plurality of barrier plates positioned on the side of the water-tubes facing the outer wall of the boiler, wherein said barrier plates have an essentially V-shaped cross-section corresponding to the configuration of adjacent pairs of water-tubes; wherein the outer surfaces of the water-tubes have exposed portions which are in contact with adjacent water-tubes, and covered portions which are in contact with adjacent barrier plates.
Claim 2
Dependent Claim
139 words
A multitubular once-through boiler comprising: a ring-shaped upper header; a ring-shaped lower header; a plurality of water-tubes connecting the upper and lower headers and combining to form a water-tube wall, wherein outer surfaces of said water-tubes have a spiral channel grooved therein; a combustion chamber surrounded by the water-tube wall; a combustion device associated with the combustion chamber; a ring-shaped passage formed between the water-tube wall and an outer wall of the boiler; and a plurality of barrier plates positioned on the side of the water-tubes facing the outer wall of the boiler, wherein said barrier plates have an essentially V-shaped cross-section corresponding to the configuration of adjacent pairs of water-tubes; wherein the outer surfaces of the water-tubes have exposed portions which are in contact with adjacent water-tubes, and covered portions which are in contact with adjacent barrier plates.
Claim 3
Dependent Claim
48 words
A multitubular once-through boiler according to claim 1, wherein said water-tube wall defines a generally cylindrical inner space, and which further comprises a partition wall for dividing said cylindrical inner space into the combustion chamber and a flue, said partition wall extending horizontally within said cylindrical inner space.
Claim 4
Dependent Claim
50 words
A multitubular once-through boiler according to claim 2, in which said combustion device is disposed in a central opening of said upper header, while said partition wall is disposed in a lower position of said cylindrical inner space to form a major upper combustion chamber and a minor lower flue.
Claim 5
Dependent Claim
50 words
A multitubular once-through boiler according to claim 2, in which said combustion device is disposed in a central opening of said lower header, while said partition wall is disposed in an upper position of said cylindrical inner space to form a minor upper flue and a major lower combustion chamber.
Claim 6
Dependent Claim
124 words
A multitubular once-through boiler comprising: a ring-shaped upper header; a ring-shaped lower header; a plurality of water-tubes connecting the upper and lower headers, wherein outer surfaces of said water-tubes have a spiral channel grooved therein and are in contact with outer surfaces of adjacent water-tubes to form a water-tube wall; a combustion chamber surrounded by the water-tube wall; a combustion device associated with the combustion chamber; a ring-shaped passage formed between the water-tube wall and an outer wall of the boiler; and a plurality of barrier plates in contact with adjacent pairs of water-tubes, on the side of the water-tubes facing the outer wall of the boiler, wherein said barrier plates have an essentially V-shaped cross-section corresponding to the configuration of the contacted water-tubes.
Claim 7
Dependent Claim
124 words
A multitubular once-through boiler comprising: a ring-shaped upper header; a ring-shaped lower header; a plurality of water-tubes connecting the upper and lower headers, wherein outer surfaces of said water-tubes have a spiral channel grooved therein and are in contact with outer surfaces of adjacent water-tubes to form a water-tube wall; a combustion chamber surrounded by the water-tube wall; a combustion device associated with the combustion chamber; a ring-shaped passage formed between the water-tube wall and an outer wall of the boiler; and a plurality of barrier plates in contact with adjacent pairs of water-tubes, on the side of the water-tubes facing the outer wall of the boiler, wherein said barrier plates have an essentially V-shaped cross-section corresponding to the configuration of the contacted water-tubes.
Claim 8
Dependent Claim
32 words
A multitubular once-through boiler according to claim 5, wherein the pitch of the channel grooved in one water-tube differs from the pitch of the channels grooved in adjacent water-tubes which it contacts.
Claim 9
Dependent Claim
17 words
A multitubular once-through boiler according to claim 5, wherein adjacent water-tubes have channels grooved in opposite directions.
Claim 10
Dependent Claim
29 words
A multitubular once-through boiler according to claim 5, wherein essentially the entire surface of the barrier plate contacting the water-tubes is in contact with the surface of the water-tubes.
Claim 11
Dependent Claim
21 words
A multitubular once-through boiler according to claim 5, wherein the barrier plates have a length substantially the same as the water-tubes.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |