US4351276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat recovery device for boilers
Assignee: FROLING & Co A CORP OF GERMANY GmbH
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Filing: 1981-03-09
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Granted: 1982-09-28
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Expires: 2001-03-09
Abstract
Abstract A heat recovery device for boilers with a blower-type burner. A heat exchanger is located in the stack gas stream and through which is passed a medium to be heated and comprises a pot-shaped vessel (2) which can be inserted into the stack gas duct and is closed on all sides. A stack gas inlet (4) leads into the upper zone of the vessel (2) and at least one stack gas outlet (6, or 30 or 31) leads out of the upper zone of the vessel (2) at a distance from the inlet. A substantially vertical partition wall (7; 21) is located in the vessel (2) and extends downwards from the cover (8) of the vessel (2) and ends at a distance from the bottom (9) of the vessel to interrupt the direct stack gas path from the inlet (4) to the outlet (6). Thus, a siphon-type stack gas path is formed with an inlet chamber (10; 26) and an outlet chamber (11; 27). A draft-interruption damper (15; 32) is fitted in the outer vessel wall in the zone of the outlet chamber (11; 27).
Inventors
- 👤 Robert Kremer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:25
CPC Classifications
F; F28; F28D; F28D21/00; F28D21/0001; F28D21/0003; F28D21/0005; F28D21/0007; F23; F23L; F23L11/00; F23L11/005; F23L11/02; F24; F24D; F24D11/00; F24D11/002; F24D11/005; F24D12/00; F24D12/02; F24D2200/00; F24D2200/16; F24D2200/18; Y; Y02; Y02B; Y02B30/00; Y10; Y10S; Y10S165/00; Y10S165/901
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
196 words
A heat recovery device for boilers, in particular for boilers with a blower-type burner, having a heat exchanger which is located in the stack gas stream and through which is passed a medium which is to be heated up, which comprises a pot-shaped vessel (2) which can be inserted in the stack gas duct and is closed on all sides, a stack gas inlet (4) leading into the upper zone of the vessel (2), at least one stack gas outlet (6, or 30 or 31) leading out of the upper zone of the vessel (2) at a distance from the inlet, a substantially vertical partition wall (7; 21) which is located in the vessel (2), extends downwards from the cover (8) of the vessel (2), ends at a distance from the bottom (9) of the vessel and interrupts the direct stack gas path from the inlet (4) to the outlet (6) in such a way that a siphon-type stack gas path with an inlet chamber (10; 26) and an outlet chamber (11; 27) is formed, and a draft-interruption damper (15; 32) fitted in the outer vessel wall in the zone of the outlet chamber (11; 27).
Claim 2
Dependent Claim
196 words
A heat recovery device for boilers, in particular for boilers with a blower-type burner, having a heat exchanger which is located in the stack gas stream and through which is passed a medium which is to be heated up, which comprises a pot-shaped vessel (2) which can be inserted in the stack gas duct and is closed on all sides, a stack gas inlet (4) leading into the upper zone of the vessel (2), at least one stack gas outlet (6, or 30 or 31) leading out of the upper zone of the vessel (2) at a distance from the inlet, a substantially vertical partition wall (7; 21) which is located in the vessel (2), extends downwards from the cover (8) of the vessel (2), ends at a distance from the bottom (9) of the vessel and interrupts the direct stack gas path from the inlet (4) to the outlet (6) in such a way that a siphon-type stack gas path with an inlet chamber (10; 26) and an outlet chamber (11; 27) is formed, and a draft-interruption damper (15; 32) fitted in the outer vessel wall in the zone of the outlet chamber (11; 27).
Claim 3
Dependent Claim
22 words
A heat recovery device as claimed in claim 1, wherein the heat exchanger (12) is located in the inlet chamber (10; 26).
Claim 4
Dependent Claim
47 words
A heat recovery device as claimed in claim 2, wherein the heat exchanger (12) is composed of tubes (13) which are bent in the shape of hairpins and extend downwards from a plenum chamber system (14) into the inlet chamber (10; 26) of the pot-shaped vessel (2).
Claim 5
Dependent Claim
36 words
A heat recovery device as claimed in any of claims 1 to 3, wherein an opening (18) for draining condensate liquid is provided at the lowest point of the bottom (9) of the pot-shaped vessel (2).
Claim 6
Dependent Claim
37 words
A heat recovery device as claimed in any of claims 1 to 3, wherein the stack gas outlet (6) is located on that side of the pot-shaped vessel (2) which is opposite the stack gas inlet (4).
Claim 7
Dependent Claim
26 words
A heat recovery device as claimed in any of claims 1 to 3, wherein the draft-interruption damper (15) is fitted below the stack gas outlet (6).
Claim 8
Dependent Claim
38 words
A heat recovery device as claimed in any of claims 1 to 3, wherein the vertical partition wall (21) has an arcuate or otherwise curved shape, the concave side of the partition wall facing the inlet chamber (26).
Claim 9
Dependent Claim
58 words
A heat recovery device as claimed in any of claims 1 to 3, wherein the draft-interruption damper (15; 32) is pivotable about a substantially horizontal axis (16) and, by virtue of an adjustable balance weight (17), is in the open position when the burner is shut down, and is in the closed position when the burner is operating.
Claim 10
Dependent Claim
59 words
A heat recovery device as claimed in claim 7, wherein the pot-shaped vessel (2) has, in the zone of the outlet chamber (27), three outlet openings (6, 30, 31) which are located at the level of the inlet opening (4), are distributed around the periphery of the vessel (2) and can be closed by a cover (33) as desired.
Claim 11
Dependent Claim
24 words
A heat recovery device as claimed in claim 9, wherein a draft-interruption damper (32) can be fitted in the outlet openings (3) as desired.
References Cited (Backward Citations)
US1065837A
Cited
US2399871A
Cited
GB1041223A
Cited
US3913663A
Cited
US4090474A
Cited
US4117883A
Cited
US4103735A
Cited
US4079885A
Cited
US4093022A
Cited
US4226363A
Cited
US4175518A
Cited
US4178907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-27 | 1986-03-29 | 1986-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-27 | 1990-03-29 | 1990-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-27 | 1994-03-29 | 1994-09-28 | $7700.00 | Window Closed / Lapsed |