US3580225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Economizer
Assignee: COY OIL CO Inc
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Filing: 1969-11-24
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Granted: 1971-05-25
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Expires: 1989-11-24
Abstract
Abstract A heating system having a furnace with a flue and a chimney in communication with the flue for venting combustion gases to the atmosphere is provided with an economizer heat exchanger intermediate the flue and the chimney for extracting an additional quantity of heat from the combustion gases to improve the efficiency of the heating system. The economizer comprises a horizontally disposed cylindrical shell mounting a bank of tubes adjacent its bottom and having an inlet chamber at one end connected to the flue and an outlet chamber at its other end connected to the chimney, the chambers being in communication with one another through the tubes. The tubes are supported at their ends and they are spaced apart by means of walls extending across the shell, the walls forming therebetween a cavity through which fluid is flowed upwardly across the tubes for extracting heat therefrom as the combustion gases flow through the tubes. A fan is mounted in the outlet chamber for inducing the gases to flow through the tubes and out the chimney, the fan having a greater capacity for removing the gases than the furnace has for producing them. In addition, means is provided to regulate the pressure in the combustion chamber of the furnace, the pressure being reduced below atmospheric due to the operation of the fan.
Inventors
- 👤 John W Coy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:17
CPC Classifications
F; F22; F22D; F22D1/00; F22D1/24
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
283 words
In a heating system comprising a combustion chamber, means to supply fuel and air to the combustion chamber to effect the combustion of fuel and the production of hot gases therein, first heat transfer means associated with the combustion chamber to extract the heat therefrom, and flue means for conveying the hot combustion gases away from the combustion chamber; the improvement comprising: an economizer having an inlet chamber interconnected with said flue means to receive the hot gases and having an outlet chamber spaced from said inlet chamber, said outlet chamber having a suction section and an exhaust section, second heat transfer means including a bank of tubes disposed between and interconnecting said inlet chamber and the suction section of said outlet chamber, means to direct flow of a heat transfer liquid across the exterior of said tube to carry heat away from said tubes, a motor-driven fan in gas communication with the exhaust section of said outlet chamber and positioned between the suction and exhaust sections of said outlet chamber for inducting a flow of said hot gases in said second heat transfer means in a direction from said inlet chamber to said outlet chamber, a shell surrounding said tubes and extending beyond said tubes and forming at least a portion of the peripheral walls of said inlet and said outlet chambers, a wall at each end of said bank of tubes supporting said tubes relative to said shell and forming a fluidtight cavity surrounding said tubes, the capacity for said flow-inducing means to remove said gases from said suction section of said outlet chamber being greater than the capacity for said fuel and air supply means to produce said hot gases.
Claim 2
Dependent Claim
283 words
In a heating system comprising a combustion chamber, means to supply fuel and air to the combustion chamber to effect the combustion of fuel and the production of hot gases therein, first heat transfer means associated with the combustion chamber to extract the heat therefrom, and flue means for conveying the hot combustion gases away from the combustion chamber; the improvement comprising: an economizer having an inlet chamber interconnected with said flue means to receive the hot gases and having an outlet chamber spaced from said inlet chamber, said outlet chamber having a suction section and an exhaust section, second heat transfer means including a bank of tubes disposed between and interconnecting said inlet chamber and the suction section of said outlet chamber, means to direct flow of a heat transfer liquid across the exterior of said tube to carry heat away from said tubes, a motor-driven fan in gas communication with the exhaust section of said outlet chamber and positioned between the suction and exhaust sections of said outlet chamber for inducting a flow of said hot gases in said second heat transfer means in a direction from said inlet chamber to said outlet chamber, a shell surrounding said tubes and extending beyond said tubes and forming at least a portion of the peripheral walls of said inlet and said outlet chambers, a wall at each end of said bank of tubes supporting said tubes relative to said shell and forming a fluidtight cavity surrounding said tubes, the capacity for said flow-inducing means to remove said gases from said suction section of said outlet chamber being greater than the capacity for said fuel and air supply means to produce said hot gases.
Claim 3
Dependent Claim
25 words
Apparatus according to claim 1 wherein the volumetric capacity of said fan is approximately double the volumetric capacity of said fuel and air supply means.
Claim 4
Dependent Claim
47 words
Apparatus according to claim 1 wherein said shell surrounding said tubes is offset with respect to said bank, and said fluid flow directing means is located adjacent the walls at the ends of the bank of tubes to provide fluid flow across said tubes in said cavity.
Claim 5
Dependent Claim
125 words
Apparatus according to claim 3 including means forming a closure across the ends of said shell a spaced distance from each wall to define said inlet and outlet chambers, said bank of tubes and said shell being disposed substantially horizontally with said shell being offset upwardly with respect to said bank, said fluid flow directing means including a fitting in the bottom of said shell adjacent to the wall defining said inlet chamber and another fitting in the top of said shell adjacent to the wall defining said outlet chamber, and including a baffle mounted on said inlet chamber wall to overlie said bank of tubes and extending outwardly from its mounting wall for directing flowing fluid toward the outlet chamber and across the tubes.
Claim 6
Dependent Claim
71 words
Apparatus according to claim 4 wherein said fan includes a motor mounted on said closure means adjacent said outlet chamber, said motor having a shaft extending through said closure means and into said outlet chamber, and a rotor mounted on said shaft for rotation in said outlet chamber, said rotor being disposed in said outlet chamber to cause said hot gases to flow from said suction section to said exhaust section.
Claim 7
Dependent Claim
36 words
Apparatus according to claim 5 including means interconnecting said fan motor and said fuel and air supply means to energize and deenergize said motor in response to the operation of said fuel and air supply means.
Claim 8
Dependent Claim
71 words
Apparatus according to claim 5 including a wall member extending at least partially across said shell intermediate said outlet chamber wall and said outlet chamber closure to form said suction and exhaust sections, means forming an aperture in the lower margin of said wall member, said fan rotor being disposed in registry with said aperture means so that upon rotation of the motor the hot gases flow axially into the rotor.
Claim 9
Dependent Claim
46 words
Apparatus according to claim 7 wherein said aperture forming means includes a peripheral flange surrounding the aperture and said fan rotor has a series of circumferentially spaced vanes surrounding said peripheral flange to cause the hot gases to flow axially into the rotor and radially therefrom.
Claim 10
Dependent Claim
33 words
Apparatus according to claim 8 wherein said wall member extends completely across said shell and said outlet chamber closure means has an opening above said motor for providing gas communication with said stack.
Claim 11
Dependent Claim
40 words
Apparatus according to claim 7 including means prOviding an adjustable vent in the top of said suction section of said outlet chamber to enable air to flow downwardly toward the aperture for mixing with the combustion gases by the fan.
Claim 12
Dependent Claim
58 words
Apparatus according to claim 7 wherein said outlet chamber closure means has a bore surrounding said motor shaft and said fan rotor is located adjacent to said outlet chamber closure means to cause air to flow axially along said shaft into the outlet chamber when the fan is rotating for effecting a cooling action on the motor shaft.
Claim 13
Dependent Claim
214 words
An economizer comprising: a hollow elongated shell, means forming a closure across the ends of said shell, a wall extending transversely of said shell a spaced distance inwardly of each of said closure means to define therebetween at least one inlet chamber at one end and at least one outlet chamber at the other end, said walls cooperating with said shell to define a fluidtight cavity therebetween, at least one bank of hollow tubes mounted at their opposite ends in each wall for providing gas communication between said inlet and outlet chambers, means partitioning said outlet chamber into a suction section and an exhaust section, means forming an aperture in said partitioning means to provide gas communication between said suction and exhaust sections, a fan mounted on said shell closure means adjacent said outlet chamber and having a rotor in registry with said aperture means to cause gas to flow through said tubes and from said suction section to said exhaust section when the rotor is rotated, means providing a gas flow passage for said inlet chamber and said exhaust section of said outlet chamber, and means for directing a flow of fluid across said tubes in said cavity, whereby heat may be transferred to the flowing fluid from gases flowing through the tubes.
Claim 14
Dependent Claim
214 words
An economizer comprising: a hollow elongated shell, means forming a closure across the ends of said shell, a wall extending transversely of said shell a spaced distance inwardly of each of said closure means to define therebetween at least one inlet chamber at one end and at least one outlet chamber at the other end, said walls cooperating with said shell to define a fluidtight cavity therebetween, at least one bank of hollow tubes mounted at their opposite ends in each wall for providing gas communication between said inlet and outlet chambers, means partitioning said outlet chamber into a suction section and an exhaust section, means forming an aperture in said partitioning means to provide gas communication between said suction and exhaust sections, a fan mounted on said shell closure means adjacent said outlet chamber and having a rotor in registry with said aperture means to cause gas to flow through said tubes and from said suction section to said exhaust section when the rotor is rotated, means providing a gas flow passage for said inlet chamber and said exhaust section of said outlet chamber, and means for directing a flow of fluid across said tubes in said cavity, whereby heat may be transferred to the flowing fluid from gases flowing through the tubes.
Claim 15
Dependent Claim
57 words
An economizer according to claim 12 wherein said shell is cylindrical and has a peripheral flange at each end, and said closure means includes a plate engaging said flange and threaded fasteners engaging said flange and said plate to mount said plate thereto, whereby at least one of said plates may be removed for cleaning the tubes.
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |