US3763831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Shoei Co Ltd
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Filing: 1972-06-27
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Granted: 1973-10-09
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Expires: 1992-06-27
Abstract
Abstract Herein disclosed is an improved heat exchanger for use in a liquid-fuel combustion furnace wherein heat exchange is effected through transfer of heat from hot water to cool water with the aid of the combustion heat in the combustion chamber of the furnace.
Inventors
- 👤 N Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:17
CPC Classifications
F; F22; F22B; F22B9/00; F22B9/02; F22B9/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
333 words
In a combustion furnace of vertical type for burning a liquid fuel, including a first cylindrical housing defining a primary combustion chamber and having in its side wall a plurality of primary air inlets for supplying therethrough primary air into said primary combustion chamber and at its bottom a fuel reservoir for storing a liquid fuel supplied thereto, a first constriction positioned atop said first cylindrical housing and having in its side wall a plurality of secondary air inlets, a second cylindrical housing positioned atop said first constriction and defining a secondary combustion chamber, a second constriction positioned atop said second cylindrical housing and having in its side wall a plurality of tertial air inlets, a cowl-shaped housing positioned atop said second constriction and a tertial combustion chamber, and a flue tube positioned atop cowl-shaped housing for exhausting therethrough combustion gases produced in said primary, secondary and tertial combustion chambers, a heat exchanger for exchanging heat between said combustion gases and cool water flowing therein to produce hot water, said heat exchanger comprising: a two disc construction including a first hollow disc disposed in said primary combustion chamber slightly upstream of said first constriction for forming a first throat together with said first constriction to accelerate combustion gases produced in said primary combustion chamber, a second hollow disc disposed in said secondary combustion chamber slightly upstream of said second constriction for forming a second throat together with said second constriction to accelerate combustion gases produced in said second combustion chamber, and a connection conduit connecting said first and second discs for providing fluid communication therebetween; a cool water supply conduit positioned partly in said disc construction and having one end downwardly extending into said first disc and the other end extending outside of said second constriction for supplying cool water into said disc construction; and a hot water flow passage in communication with said second disc for guiding outside of said combustion furnace hot water warmed while convectively flowing in said disc construction.
Claim 2
Dependent Claim
333 words
In a combustion furnace of vertical type for burning a liquid fuel, including a first cylindrical housing defining a primary combustion chamber and having in its side wall a plurality of primary air inlets for supplying therethrough primary air into said primary combustion chamber and at its bottom a fuel reservoir for storing a liquid fuel supplied thereto, a first constriction positioned atop said first cylindrical housing and having in its side wall a plurality of secondary air inlets, a second cylindrical housing positioned atop said first constriction and defining a secondary combustion chamber, a second constriction positioned atop said second cylindrical housing and having in its side wall a plurality of tertial air inlets, a cowl-shaped housing positioned atop said second constriction and a tertial combustion chamber, and a flue tube positioned atop cowl-shaped housing for exhausting therethrough combustion gases produced in said primary, secondary and tertial combustion chambers, a heat exchanger for exchanging heat between said combustion gases and cool water flowing therein to produce hot water, said heat exchanger comprising: a two disc construction including a first hollow disc disposed in said primary combustion chamber slightly upstream of said first constriction for forming a first throat together with said first constriction to accelerate combustion gases produced in said primary combustion chamber, a second hollow disc disposed in said secondary combustion chamber slightly upstream of said second constriction for forming a second throat together with said second constriction to accelerate combustion gases produced in said second combustion chamber, and a connection conduit connecting said first and second discs for providing fluid communication therebetween; a cool water supply conduit positioned partly in said disc construction and having one end downwardly extending into said first disc and the other end extending outside of said second constriction for supplying cool water into said disc construction; and a hot water flow passage in communication with said second disc for guiding outside of said combustion furnace hot water warmed while convectively flowing in said disc construction.
Claim 3
Dependent Claim
83 words
A heat exchanger according to claim 1, wherein said hot water flow passage includes a hot water housing encompassing said cowl-shaped housing and/or said flue tube for defining a hot water reservoir therebetween, a horizontal conduit having fluid communication with both said second disc and said hot water reservoir and horizontally extending across said tertial combustion chamber and a hot water outlet mounted on the uppermost wall of said hot water housing for convectively ejecting the hottest water in said hot water reservoir.
Claim 4
Dependent Claim
56 words
A heat exchanger according to claim 2, wherein said hot water flow passage further includes a plurality of slanting conduits slantingly extending across said tertial combustion chamber and/or said flue tube for further exchanging heat between said combustion gases flowing in said tertial combustion chamber and/or said flue tube and said hot water convectively flowing therein.
Claim 5
Dependent Claim
38 words
A heat exchanger according to claim 1, wherein each of said first and second discs has an upper wall respectively facing said first and second constrictions, the section of said upper wall having a generally inverted letter V.
Claim 6
Dependent Claim
209 words
A heat exchanger according to claim 1, further comprising a fuel level regulator including an upper fuel storage tank positioned over said fuel reservoir in the bottom of said first housing for supplying a liquid fuel to said reservoir, a fuel supply conduit for providing fluid communication between said upper fuel storage tank and said fuel reservoir, a lower fuel storage tank positioned below said upper fuel storage tank, a fuel drain pipe Having fluid communication with said fuel reservoir and substantially horizontally extending into said lower fuel storage tank, a fuel level regulating valve mounted on said fuel drain pipe and having a valve tube rotatable on said fuel drain pipe and an angle-adjustable fuel release tube directed substantially perpendicularly to said valve tube, said angle-adjustable tube being angle-adjusted with respect to the level of the liquid fuel reserved in said fuel reservoir as said valve tube is manually rotated on said drain pipe, a pipeline for providing fluid communication between said upper and lower fuel storage tanks, and an oil pump located halfway of said pipeline for recirculating up to said upper fuel storage tank from said lower fuel storage tank through said pipeline the liquid fuel which has been drained into said lower fuel storage tank.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |