US3722583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerated air dryer
Assignee: Arrow Pneumatics Inc
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Filing: 1971-02-22
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Granted: 1973-03-27
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Expires: 1991-02-22
Abstract
Abstract A refrigerated air dryer for compressed air systems wherein water vapor and other contaminants are removed from said air by means of controlled condensation. The disclosed system utilizes a novel pump-down arrangement wherein a major portion of the refrigerant may be removed from the cooler coils when the system is not in use, thereby preventing damage due to refrigerant expansion. Further, the coil assembly for the disclosed system utilizes a novel, dual-passage coil construction and method of assembly. More specifically, regarding this latter point, inner and outer tubular members are employed, with a selected section of the inner tubular member collapsed partially during forming to effect engagement of said inner tubular member with said outer tubular member and thereby properly supporting said inner tubular member within said outer tubular member.
Inventors
- 👤 M Fiedler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:42
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/40; B; B01; B01D; B01D53/00; B01D53/26; F04; F04B; F04B39/00; F04B39/16; F25; F25B; F25B47/00; F25B47/006; F28D; F28D7/00; F28D7/10; F28D7/14; F28D21/00; F28D2021/0019; F28D2021/0038
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
187 words
A coil construction for use with a refrigerated heat exchanger, or the like, said construction including an outer tubular member and an inner tubular member disposed within said outer tubular member and having an outer diameter smaller than the inner diameter of said outer tubular member whereby the space between said inner and outer members define a first passage capable of carrying a refrigerant, and a second passage being defined by the inner wall of said inner tubular member for a fluid medium to be cooled, said coil construction including at least one bend; and means for maintaining said inner and outer tubular members in generally coaxial relation, said means including a partially collapsed portion of said inner tubular member in the area of said bend, said partially collapsed portion providing a generally elliptical shaped wall section, different in configuration than the outer tubular member, with said elliptical shaped wall section engaging the inner wall of said outer tubular member at circumferentially spaced areas, said engagement preventing total collapse of said inner tubular member and supporting said inner tubular member with respect to said outer tubular member.
Claim 2
Dependent Claim
187 words
A coil construction for use with a refrigerated heat exchanger, or the like, said construction including an outer tubular member and an inner tubular member disposed within said outer tubular member and having an outer diameter smaller than the inner diameter of said outer tubular member whereby the space between said inner and outer members define a first passage capable of carrying a refrigerant, and a second passage being defined by the inner wall of said inner tubular member for a fluid medium to be cooled, said coil construction including at least one bend; and means for maintaining said inner and outer tubular members in generally coaxial relation, said means including a partially collapsed portion of said inner tubular member in the area of said bend, said partially collapsed portion providing a generally elliptical shaped wall section, different in configuration than the outer tubular member, with said elliptical shaped wall section engaging the inner wall of said outer tubular member at circumferentially spaced areas, said engagement preventing total collapse of said inner tubular member and supporting said inner tubular member with respect to said outer tubular member.
Claim 3
Dependent Claim
32 words
A coil construction as defined in claim 1 wherein said inner tubular member includes a plurality of fins formed on the inner wall thereof to strengthen said member and facilitate heat exchange.
Claim 4
Dependent Claim
17 words
A coil construction as defined in claim 2 wherein said fins are disposed in a helical pattern.
Claim 5
Dependent Claim
242 words
A coil assembly for a heat exchanger, or the like, including; a plurality of stacked coil constructions, each said coil construction including an outer tubular member and an inner tubular member disposed for said outer tubular member, the space between said inner and outer tubular members providing a first passage for a first fluid medium and said inner tubular member providing a second passage for a second fluid medium whereby heat transfer can take place between said fluid mediums trough the wall of said inner tubular member; distribution means in communication with said first passage of each coil construction and including means for connection to a source of supply of said first fluid medium; and manifold means in connection with said second passageway of each coil construction and including means for connection to a source of supply of said second fluid medium, each said coil construction having at least one bend; and means for maintaining said inner and outer tubular members in generally coaxial relation, said means including a partially collapsed portion of said inner tubular member in the area of said bend, which provides a generally elliptical shaped wall section, different in configuration than that of the outer tubular member, said elliptical shaped wall section engaging the inner wall of said outer tubular member at circumferentially spaced areas, said engagement preventing total collapse of said inner tubular member and supporting said inner tubular member with respect to said outer tubular member.
Claim 6
Dependent Claim
242 words
A coil assembly for a heat exchanger, or the like, including; a plurality of stacked coil constructions, each said coil construction including an outer tubular member and an inner tubular member disposed for said outer tubular member, the space between said inner and outer tubular members providing a first passage for a first fluid medium and said inner tubular member providing a second passage for a second fluid medium whereby heat transfer can take place between said fluid mediums trough the wall of said inner tubular member; distribution means in communication with said first passage of each coil construction and including means for connection to a source of supply of said first fluid medium; and manifold means in connection with said second passageway of each coil construction and including means for connection to a source of supply of said second fluid medium, each said coil construction having at least one bend; and means for maintaining said inner and outer tubular members in generally coaxial relation, said means including a partially collapsed portion of said inner tubular member in the area of said bend, which provides a generally elliptical shaped wall section, different in configuration than that of the outer tubular member, said elliptical shaped wall section engaging the inner wall of said outer tubular member at circumferentially spaced areas, said engagement preventing total collapse of said inner tubular member and supporting said inner tubular member with respect to said outer tubular member.
Claim 7
Dependent Claim
57 words
A coil assembly as defined in claim 4 wherein said distributing means includes a distributor housing having an inlet port for attachment to said source of supply of the first fluid medium, and a plurality of outlet ports; a like number of tubing elements connecting said outlet ports of the distributor housing with said first fluid passage.
Claim 8
Dependent Claim
71 words
A coil assembly as defined in claim 5 and further including a tubular fitting disposed about and having one end sealed with respect to each said inner tubular member and having the opposite end thereof operably connected to the corresponding outer tubular member, and an inlet port in the wall of said tubular fitting, with said like number of tubing elements being connected to said inlet ports of said tubular fittings.
Claim 9
Dependent Claim
33 words
A coil assembly as defined in claim 4 further including an accumulator connected to the outlet ends of said first fluid passages and outlet manifold means operably connected to said second fluid passages.
Claim 10
Dependent Claim
33 words
A coil assembly as defined in claim 4 wherein each said inner tubular member includes a plurality of fins formed on the inner wall thereof to strengthen said member and facilitate heat exchange.
Claim 11
Dependent Claim
17 words
A coil assembly as defined in claim 8 wherein said fins are disposed in a helical pattern.
References Cited (Backward Citations)
US660292A
Cited
US2365497A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |