US3575387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air control damper for evaporative heat exchangers
Assignee: Baltimore Aircoil Co Inc
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Filing: 1968-12-05
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Granted: 1971-04-20
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Expires: 1988-12-05
Abstract
Abstract This application discloses a blow-through air fan for evaporative heat exchangers having a diffusion duct containing a moveable damper and a cooperating fixed baffle so that in the full flow position little resistance to air is offered and in the maximum choke position the air pressure across the mouth of the air discharge duct is sufficiently uniform to prevent aspiration of water.
Inventors
- 👤 Wilson E Bradley Jr
- 👤 Edward N Schinner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:34
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/46; F04D29/462; F04D27/00; F04D27/02; F04D27/0253; F28; F28C; F28C1/00; F28C1/02; F28F; F28F25/00; F28F25/10; F28F25/12; F05; F05D; F05D2250/00; F05D2250/50; F05D2250/52; Y; Y02; Y02B; Y02B30/00; Y02B30/70
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
133 words
In an evaporative heat exchanger having a sump for receiving water gravitating from a heat exchange region, a wall partially defining said sump, a centrifugal blower located outside said sump, air ducting surrounding said blower, passing through said wall and presenting an air discharge mouth within the sump, the improvement that comprises, a damper located in said ducting, means mounting said damper for movement from a full open position in which it lies substantially parallel to the air flow in the region where it is located to a maximum choke position in which it passes at least one stream of air and means downstream of said damper to modify the direction of said airstream to distribute the air across the full cross section of the ducting mouth evenly enough to prevent water aspiration.
Claim 2
Dependent Claim
133 words
In an evaporative heat exchanger having a sump for receiving water gravitating from a heat exchange region, a wall partially defining said sump, a centrifugal blower located outside said sump, air ducting surrounding said blower, passing through said wall and presenting an air discharge mouth within the sump, the improvement that comprises, a damper located in said ducting, means mounting said damper for movement from a full open position in which it lies substantially parallel to the air flow in the region where it is located to a maximum choke position in which it passes at least one stream of air and means downstream of said damper to modify the direction of said airstream to distribute the air across the full cross section of the ducting mouth evenly enough to prevent water aspiration.
Claim 3
Dependent Claim
17 words
The improvement of claim 1 in which the means downstream of said damper is a stationary guide.
Claim 4
Dependent Claim
146 words
In an evaporative heat exchanger having a sump for receiving water gravitating from a heat exchange region, a sloping wall partially defining said sump, a centrifugal blower located outside said sump, air ducting surrounding said blower, passing through said wall and presenting an air discharge mouth within the sump, the improvement that comprises, a damper located in said ducting on the same side of said sloping wall as said centrifugal blower, means mounting said damper for movement from a full open position in which it lies substantially parallel to the air flow in the region where it is located to a maximum choke position in which it passes at least one stream of air and means downstream of said damper to modify the direction of said airstream to distribute the air across the full cross section of the ducting mouth evenly enough to prevent water aspiration.
Claim 5
Dependent Claim
146 words
In an evaporative heat exchanger having a sump for receiving water gravitating from a heat exchange region, a sloping wall partially defining said sump, a centrifugal blower located outside said sump, air ducting surrounding said blower, passing through said wall and presenting an air discharge mouth within the sump, the improvement that comprises, a damper located in said ducting on the same side of said sloping wall as said centrifugal blower, means mounting said damper for movement from a full open position in which it lies substantially parallel to the air flow in the region where it is located to a maximum choke position in which it passes at least one stream of air and means downstream of said damper to modify the direction of said airstream to distribute the air across the full cross section of the ducting mouth evenly enough to prevent water aspiration.
Claim 6
Dependent Claim
148 words
In an evaporative heat exchanger having a sump for receiving water gravitating from a heat exchange region, a sloping wall partially defining said sump, a centrifugal blower located outside said sump, air ducting surrounding said blower, passing through said wall and presenting an air discharge mouth within the sump, the improvement that comprises, a damper located in said ducting on the same side of said sloping wall as said centrifugal blower, means mounting said damper for movement from a full open position in which it lies substantially parallel to the air flow in the region where it is located to a maximum choke position in which it passes at least two streams of air and means downstream of said damper to modify the direction of at least one of said streams to promote the merging of said streams by the time the mouth of the ducting is reached.
Claim 7
Dependent Claim
148 words
In an evaporative heat exchanger having a sump for receiving water gravitating from a heat exchange region, a sloping wall partially defining said sump, a centrifugal blower located outside said sump, air ducting surrounding said blower, passing through said wall and presenting an air discharge mouth within the sump, the improvement that comprises, a damper located in said ducting on the same side of said sloping wall as said centrifugal blower, means mounting said damper for movement from a full open position in which it lies substantially parallel to the air flow in the region where it is located to a maximum choke position in which it passes at least two streams of air and means downstream of said damper to modify the direction of at least one of said streams to promote the merging of said streams by the time the mouth of the ducting is reached.
Claim 8
Dependent Claim
35 words
The improvement of claim 4 in which the means downstream of said damper is a stationary guide which in the full open position of the damper lies parallel to the air flow from the blower.
Claim 9
Dependent Claim
25 words
The improvement of claim 5 in which the means downstream of the damper is on the same side of said sloping wall as said damper.
Claim 10
Dependent Claim
22 words
The improvement of claim 4 in which the means downstream of said damper is a pair of rods extending across the airstream.
Claim 11
Dependent Claim
28 words
The improvement of claim 7 in which the pair of rods are located on the sump side of the plane of the sloping Wall partially defining said sump.
Claim 12
Dependent Claim
25 words
The improvement of claim 4 in which said damper extends for the full width of said ducting and is curved as viewed in cross section.
References Cited (Backward Citations)
US2374130A
Cited
US3169575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |