US4253426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reservoir type water heating device
Assignee: Mitsubishi Electric Corp
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Filing: 1978-10-20
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Granted: 1981-03-03
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Expires: 1998-10-20
Abstract
Abstract A vertical drum is disposed upon and connected to a combustion chamber through a heat transfer wall. A burner opens in the combustion chamber to face the heat transfer wall and an exhaust tube is connected to the combustion chamber on the lower wall adjacent its periphery and extends horizontally below the drum until it communicates with the atmosphere.
Inventors
- 👤 Atsuyoshi Nishi
- 👤 Hiroyasu Kuwazawa
- 👤 Kaneyoshi Oshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:58
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/0027; F24H1/0036; F24H1/18; F24H1/186; F24H9/00; F24H9/18; F24H9/1809; F24H9/1832; F24H9/1836
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
278 words
A reservoir type water heating device comprising: a closed end drum having a hot water reservoir located therein for accumulating a specified quantity of water, said drum including a convex shaped heated surface member at the bottom which is convex toward the interior thereof through which said water is heated; a water feed pipe connected to and communicating with said hot water reservoir for supplying cold water to said reservoir and located at the lower portion of said drum at the same vertical level to said convex shaped heated surface member for having said water strike against the lateral side of said convex shaped heated surface member for slowing the flow speed of said cold water and preventing mixing of said cold water with hot water at a higher portion in said closed end drum; a hot water pipe for supplying hot water from said reservoir connected to and communicating with said reservoir at the top thereof for having said hot water forced upward and out through said hot water pipe by said cold water supplied at the lower portion of said drum; fuel combustion means disposed outside of said hot water reservoir and below said reservoir, said fuel combustion means having a combustion chamber at the bottom of said drum for heating water within said reservoir through said convex shaped heated surface member and thereby having combustion products formed within said chamber; and an exhaust passageway directly connected to said combustion chamber for exhausting said combustion products from said chamber, said exhaust passageway being disposed and extending away from said chamber in spaced relationship with said reservoir so as to not come in contact with said water.
Claim 2
Dependent Claim
278 words
A reservoir type water heating device comprising: a closed end drum having a hot water reservoir located therein for accumulating a specified quantity of water, said drum including a convex shaped heated surface member at the bottom which is convex toward the interior thereof through which said water is heated; a water feed pipe connected to and communicating with said hot water reservoir for supplying cold water to said reservoir and located at the lower portion of said drum at the same vertical level to said convex shaped heated surface member for having said water strike against the lateral side of said convex shaped heated surface member for slowing the flow speed of said cold water and preventing mixing of said cold water with hot water at a higher portion in said closed end drum; a hot water pipe for supplying hot water from said reservoir connected to and communicating with said reservoir at the top thereof for having said hot water forced upward and out through said hot water pipe by said cold water supplied at the lower portion of said drum; fuel combustion means disposed outside of said hot water reservoir and below said reservoir, said fuel combustion means having a combustion chamber at the bottom of said drum for heating water within said reservoir through said convex shaped heated surface member and thereby having combustion products formed within said chamber; and an exhaust passageway directly connected to said combustion chamber for exhausting said combustion products from said chamber, said exhaust passageway being disposed and extending away from said chamber in spaced relationship with said reservoir so as to not come in contact with said water.
Claim 3
Dependent Claim
42 words
A reservoir type water heating device as claimed in claim 1 wherein said combustion means comprises a burner which is disposed directly under said reservoir and a blower which is disposed below said burner for supplying air for burning to said burner.
Claim 4
Dependent Claim
27 words
A reservoir type water heating device as claimed in claim 2 further comprising a pump disposed below said burner for supplying a liquid fuel to said burner.
Claim 5
Dependent Claim
54 words
A reservoir type water heating device as claimed in claim 3 further comprising an air feed passageway disposed below a peripheral portion of said combustion chamber for encircling said exhaust passageway, said air feed passageway including one end communicating with a suction side of said blower and the other end communicating with the atmosphere.
Claim 6
Dependent Claim
25 words
A reservoir type water heating device as claimed in claim 3 wherein said exhaust passageway is located between said hot water reservoir and said blower.
Claim 7
Dependent Claim
63 words
A reservoir type water heating device as claimed in claim 3 having said pump and said blower positioned so as to be spaced from said burner by a specified amount and having a portion of said insulation located on the top wall of said drum and another portion secured to the lower wall of said combustion chamber beneath the bottom of said drum.
Claim 8
Dependent Claim
68 words
A reservoir type water heating device as claimed in claim 1 wherein said exhaust passageway is a tube having a transverse tube portion which has one end portion located outside of a space disposed directly under said drum and a longitudinal tube portion having one end connected to the other end of said transverse tube portion and the other end communicating with the interior of said combustion chamber.
Claim 9
Dependent Claim
36 words
A reservoir type water heating device as claimed in claim 7 further comprising a chimney vertically disposed outside of said drum having a lower end thereof connected to said one end of said transverse tube portion.
Claim 10
Dependent Claim
39 words
A reservoir type water heating device as claimed in claim 8 wherein said chimney includes a transversely disposed extension which is tilted downward at a predetermined angle to the horizontal and connected to the upper end of said chimney.
Claim 11
Dependent Claim
108 words
A reservoir type water heating device as claimed in claim 1 further comprising a plurality of leg members disposed in spaced relationship underneath said drum for supporting said drum and thereby defining a space directly under said drum and wherein said combustion means includes a burner disposed directly under said hot water reservoir, a pump for supplying a liquid fuel to said burner and a blower for supplying burning air to said burner, said pump and blower being disposed in said spaced and a bottom plate disposed below said burner to be spaced away from the latter by a predetermined distance having said pump and blower secured thereto.
Claim 12
Dependent Claim
32 words
A reservoir type water heating device as claimed in claim 10 wherein said heated convex shaped surface member defines the upper boundary of said space in which said combustion chamber is located.
Claim 13
Dependent Claim
35 words
A reservoir type water heating device as claimed in claim 10 wherein said heated convex shaped surface member defines the upper boundary of said space in which a substantial part of said burner is located.
Claim 14
Dependent Claim
46 words
A reservoir type water heating device as claimed in claim 1 wherein said combustion means includes a burner disposed directly under said drum along the longitudinal axis thereof and said heated convex surface member has its center disposed at the highest level along said longitudinal axis.
Claim 15
Dependent Claim
42 words
A reservoir type water heating device as claimed in claim 1 wherein said combustion chamber has a surface member opposite said convex shaped member and said exhaust passageway opens into a peripheral portion of said combustion chamber on said surface member thereof.
Claim 16
Dependent Claim
45 words
A reservoir type water heating device as claimed in claim 1 wherein said water supply pipe is connected to a lateral peripheral wall of said drum and said hot water delivery pipe is connected to the central portion of a top wall of said drum.
Claim 17
Dependent Claim
40 words
A reservoir type water heating device as claimed in claim 1 further comprising an outer enclosure disposed so as to encircle said drum for having an annular space of predetermined width therebetween, and a heat insulating material filling said space.
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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) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |