US3630138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-conditioning system with positive pressurization
Assignee: RTX Corp
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Filing: 1970-10-26
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Granted: 1971-12-28
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Expires: 1990-10-26
Abstract
Abstract An air-conditioning system in which conditioned air is being provided to a compartment by a choked air-conditioning system having minimum and maximum mass flow rates and wherein an undersized capacity fan operating in a pressure drop condition is placed in the outlet of the compartment to insure compartment pressurization despite leakage within the anticipated range within the operational flow range of the air conditioner, and which fan will operate to create a pressure rise to pump air through the compartment upon discontinued use of the airconditioning system, and further, wherein a pressure relief valve is utilized in parallel flow relation with the fan to protect compartment structural integrity and to maintain compartment pressure changes within the limits of human comfort.
Inventors
- 👤 Jens Martin Anders Marcussen
- 👤 Kenneth Martin Rosen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:39
CPC Classifications
B; B64; B64D; B64D13/00
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
193 words
An aircraft air-conditioning system including: A. a compartment to be air-conditioned and having: 1. an inlet flow orifice, and 2. an outlet flow orifice, B. an air-conditioning unit operable to selectively condition the air to be furnished to said compartment and operatively connected to said compartment inlet orifice to provide conditioned air thereto and including: 1. selectively sized flow restricting means, C. a pressurized air source operatively connected to provide a pressurized source of air to said air-conditioning unit of selected mass flow rate that the air-conditioning unit will operate in a choked condition due to the sizing of said restricting means and therefore be independent of pressure variation downstream thereof and being of sufficient flow capacity that the mass flow rate of the air-conditioning unit is always above a preselected minimum mass flow rate, D. means to maintain a pressurized condition in said compartment over the range of anticipated compartment leakage conditions comprising: 1. a fan operatively mounted in said outlet orifice and being of selected mass flow pumping capacity less than the mass flow rate of the air-conditioning unit so that a pressure drop exists across said fan at all times.
Claim 2
Dependent Claim
193 words
An aircraft air-conditioning system including: A. a compartment to be air-conditioned and having: 1. an inlet flow orifice, and 2. an outlet flow orifice, B. an air-conditioning unit operable to selectively condition the air to be furnished to said compartment and operatively connected to said compartment inlet orifice to provide conditioned air thereto and including: 1. selectively sized flow restricting means, C. a pressurized air source operatively connected to provide a pressurized source of air to said air-conditioning unit of selected mass flow rate that the air-conditioning unit will operate in a choked condition due to the sizing of said restricting means and therefore be independent of pressure variation downstream thereof and being of sufficient flow capacity that the mass flow rate of the air-conditioning unit is always above a preselected minimum mass flow rate, D. means to maintain a pressurized condition in said compartment over the range of anticipated compartment leakage conditions comprising: 1. a fan operatively mounted in said outlet orifice and being of selected mass flow pumping capacity less than the mass flow rate of the air-conditioning unit so that a pressure drop exists across said fan at all times.
Claim 3
Dependent Claim
35 words
an outlet flow orifice, B. an air-conditioning unit operable to selectively condition the air to be furnished to said compartment and operatively connected to said compartment inlet orifice to provide conditioned air thereto and including:
Claim 4
Dependent Claim
35 words
an outlet flow orifice, B. an air-conditioning unit operable to selectively condition the air to be furnished to said compartment and operatively connected to said compartment inlet orifice to provide conditioned air thereto and including:
Claim 5
Dependent Claim
28 words
Apparatus according to claim 1 and further including a pressure relief valve operatively mounted in said compartment to relieve compartment pressure when compartment pressure exceeds a preselected limit.
Claim 6
Dependent Claim
46 words
an outlet orifice, B. means to provide conditioned air to said compartment through said inlet orifice at a minimum total flow rate and independent of compartment pressure, C. means to produce a positive pressure in said compartment throughout the range of compartment anticipated leakage conditions including:
Claim 7
Dependent Claim
46 words
an outlet orifice, B. means to provide conditioned air to said compartment through said inlet orifice at a minimum total flow rate and independent of compartment pressure, C. means to produce a positive pressure in said compartment throughout the range of compartment anticipated leakage conditions including:
Claim 8
Dependent Claim
46 words
an outlet orifice, B. means to provide conditioned air to said compartment through said inlet orifice between maximum and minimum total flow rates and independent of compartment pressure, C. means to produce a positive pressure iN said compartment throughout the range of anticipated compartment leakage including:
Claim 9
Dependent Claim
46 words
an outlet orifice, B. means to provide conditioned air to said compartment through said inlet orifice between maximum and minimum total flow rates and independent of compartment pressure, C. means to produce a positive pressure iN said compartment throughout the range of anticipated compartment leakage including:
Claim 10
Dependent Claim
46 words
an outlet orifice, B. means to provide conditioned air to said compartment through said inlet orifice between maximum and minimum total flows rates and independent of compartment pressure, C. means to produce a positive pressure in said compartment throughout the range of anticipated compartment leakage including:
Claim 11
Dependent Claim
46 words
an outlet orifice, B. means to provide conditioned air to said compartment through said inlet orifice between maximum and minimum total flows rates and independent of compartment pressure, C. means to produce a positive pressure in said compartment throughout the range of anticipated compartment leakage including:
Claim 12
Dependent Claim
15 words
a pressure relief valve located in parallel flow relation with said outlet in said compartment,
Claim 13
Dependent Claim
15 words
a pressure relief valve located in parallel flow relation with said outlet in said compartment,
Claim 14
Dependent Claim
26 words
Apparatus according to claim 2 wherein said outlet orifice-fan and said pressure relief valve are located in parallel flow relationship in the walls of said compartment.
Claim 15
Dependent Claim
38 words
Apparatus according to claim 3 and including a second compartment located with respect to said first compartment so that the flow of conditioned air through said outlet orifice-fan and said pressure relief valve passes through said second compartment.
Claim 16
Dependent Claim
27 words
a pressure source operative to flow pressurized air through said compartment inlet and said compartment throughout a range of volumetric flow rates having a preselected minimum, and
Claim 17
Dependent Claim
27 words
a pressure source operative to flow pressurized air through said compartment inlet and said compartment throughout a range of volumetric flow rates having a preselected minimum, and
Claim 18
Dependent Claim
21 words
fan means located in said output and sized to operate with zero pressure rise thereacross at said minimum volumetric flow rate.
Claim 19
Dependent Claim
21 words
fan means located in said output and sized to operate with zero pressure rise thereacross at said minimum volumetric flow rate.
Claim 20
Dependent Claim
12 words
An air-conditioning system including: A. a compartment to be air-conditioned and including:
Claim 21
Dependent Claim
12 words
An air-conditioning system including: A. a compartment to be air-conditioned and including:
Claim 22
Dependent Claim
26 words
Apparatus according to claim 5 and further including a pressure relief valve mounted in parallel flow relationship with said fan in the walls of said compartment.
Claim 23
Dependent Claim
35 words
Apparatus according to claim 6 and including a second compartment positioned with respect to said first compartment so that the conditioned airflow from said fan and said pressure relief valve passes through said second compartment.
Claim 24
Dependent Claim
25 words
Apparatus according to claim 5 wherein said fan is continuously operative and draws air through said compartment when said conditioned air providing means is inoperative.
Claim 25
Dependent Claim
28 words
Apparatus according to claim 8 and including an emergency air inlet in said compartment to admit air into said compartment when said conditioned air providing means is inoperative.
Claim 26
Dependent Claim
11 words
Apparatus according to claim 9 wherein said emergency inlet is filtered.
Claim 27
Dependent Claim
12 words
An air-conditioning system including: A. a compartment to be air-conditioned and including:
Claim 28
Dependent Claim
12 words
An air-conditioning system including: A. a compartment to be air-conditioned and including:
Claim 29
Dependent Claim
78 words
Apparatus according to claim 11 wherein said compartment has a maximum internal pressure structural integrity limit and including: A. a pressure relief valve operatively mounted in said compartment in parallel flow relationship with said fan means and being biased to a closed position and actuatable at a preselected compartment internal pressure below said structural integrity limit compartment internal pressure so that said pressure relief valve will actuate to reduce compartment pressure when compartment pressure exceeds a preselected pressure.
Claim 30
Dependent Claim
20 words
An air-conditioning system including: A. a compartment to be air-conditioned having a maximum internal pressure structural integrity limit and including:
Claim 31
Dependent Claim
20 words
An air-conditioning system including: A. a compartment to be air-conditioned having a maximum internal pressure structural integrity limit and including:
Claim 32
Dependent Claim
23 words
In combination: A. a compartment, B. means for maintaining a pressure differential between the interior of said compartment and the exterior environment including:
Claim 33
Dependent Claim
23 words
In combination: A. a compartment, B. means for maintaining a pressure differential between the interior of said compartment and the exterior environment including:
References Cited (Backward Citations)
US3192848A
Cited
US3367256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |