US3849854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making evaporator or condenser unit
Assignee: JEPSON REFRIGERATION Corp 340 BUTTERFIELD ROAD STE 3B ELHMURST IL 60126 A CORP OF
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Filing: 1973-09-24
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Granted: 1974-11-26
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Expires: 1993-09-24
Abstract
Abstract The method of making an evaporator or condenser unit for refrigeration apparatus wherein ends of preferably aluminum main tubes extended through heat exchange plates or fins are joined together by U-bend connector tubes and transition tubes made from another metal, preferably copper, to form a serpentine coil. One end of each transition tube is telescopically assembled with an associated end of a main tube and metallurgically bonded thereto by an electromagnetic solid state joining process. The other end of each transition tube is telescopically assembled with an associated end of a connector tube and soldered thereto.
Inventors
- 👤 H Mattioli
- 👤 R Douglas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:34
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/08; F28F21/081; F28F21/084; B; B21; B21D; B21D53/00; B21D53/02; B21D53/08; B21D53/085; F28F9/00; F28F9/26; F28F9/262; F28F9/268; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/4938; Y10T29/49396; Y10T29/49803
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
286 words
A method for making an evaporator or condenser for refrigeration apparatus comprising the steps of providing a plurality of main tube sections made from one metal and defining a plurality of main tube ends, providing a plurality of transition tubes made from another metal, each of said transition tubes including at least one end portion having an outside diameter substantially equal to the inside diameter of an associated one of said main tube ends to generally interface in telescopic assembly therewith, telescopically assembling each one end portion in an associated one of said main tube ends to define a transition joint assembly, heating each transition joint assembly to a temperature below the melting temperature of both said one metal and said other metal, applying sufficient radially directed force simultaneously around each transition joint assembly while said transition joint assembly is in its heated condition to effect a solid state metallurgical joinder of said one end portion to said main tube end which eliminates the interface delineated by the mating surfaces thereof, providing a plurality of heat exchange plates having apertures therein for receiving therethrough each of said main tube sections and an associated transition tube joined thereto, thrusting said main tube sections through said heat exchange plates in generally parallel relation to dispose said plates in parallel spaced relation along said main tubes, providing at least one generally U-shaped connector tube made from said other metal and having a pair of connector tube ends, telescopically assembling each of said connector tube ends with an associated other end of said transition tube to form another tube joint, and bonding each of said connector tube ends to said other end of an associated one of said transition tubes.
Claim 2
Independent Claim
286 words
A method for making an evaporator or condenser for refrigeration apparatus comprising the steps of providing a plurality of main tube sections made from one metal and defining a plurality of main tube ends, providing a plurality of transition tubes made from another metal, each of said transition tubes including at least one end portion having an outside diameter substantially equal to the inside diameter of an associated one of said main tube ends to generally interface in telescopic assembly therewith, telescopically assembling each one end portion in an associated one of said main tube ends to define a transition joint assembly, heating each transition joint assembly to a temperature below the melting temperature of both said one metal and said other metal, applying sufficient radially directed force simultaneously around each transition joint assembly while said transition joint assembly is in its heated condition to effect a solid state metallurgical joinder of said one end portion to said main tube end which eliminates the interface delineated by the mating surfaces thereof, providing a plurality of heat exchange plates having apertures therein for receiving therethrough each of said main tube sections and an associated transition tube joined thereto, thrusting said main tube sections through said heat exchange plates in generally parallel relation to dispose said plates in parallel spaced relation along said main tubes, providing at least one generally U-shaped connector tube made from said other metal and having a pair of connector tube ends, telescopically assembling each of said connector tube ends with an associated other end of said transition tube to form another tube joint, and bonding each of said connector tube ends to said other end of an associated one of said transition tubes.
Claim 3
Dependent Claim
127 words
A method for making an evaporator or condenser as set forth in claim 1 wherein the step of providing a plurality of main tube sections is further defined as providing a plurality of generally U-shaped tubes, each of said U-shaped tubes having a pair of elongated parallel straight main tube sections joined together by an integral generally U-shaped intermediate section, each of said main tube sections defining one of said main tube ends, and the step of thrusting said main tube sections through said heat exchange plates is performed after the steps of telescopically assembling each said one end portion in an associated main tube end to define a transition joint assembly, heating each transition joint assembly, and applying radially directed force around each transition joint assembly.
Claim 4
Dependent Claim
40 words
A method for making an evaporator or condenser construction as set forth in claim 1 wherein the step of applying force is further characterized as applying electromagnetic pressure for a fraction of a second around each said transition joint assembly.
Claim 5
Dependent Claim
44 words
A method for making an evaporator or condenser as set forth in claim 3 wherein the step of applying electromagnetic pressure is further defined as coaxially aligning said transition joint assembly in an induction coil and applying a pulsed electrical current to said coil.
Claim 6
Dependent Claim
31 words
A method for making an evaporator or condenser coil as set forth in claim 4 wherein the step of heating comprises the step of applying alternating electrical current to said coil.
Claim 7
Dependent Claim
55 words
A method for making an evaporator or condenser construction as set forth in claim 1 including the additional step of applying a coating material to the exterior surface of each one end portion and each associated Main tube end in the region of the transition joint therebetween to seal the latter region from the atmosphere.
Claim 8
Dependent Claim
37 words
A method for making an evaporator or condenser construction as set forth in claim 1 wherein the step of bonding each of said connector tube ends is further defined as soldering each of said connector tube ends.
Claim 9
Dependent Claim
53 words
A method for making an evaporator or condenser construction as set forth in claim 1 including the additional step of enlarging the inside diameter of said other end of each of said transition tubes, said step of enlarging to be performed before the step of telescopically assembling each of said connector tube ends.
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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |