CA1200829A - Explosively welded radiant heat shield for a super conducting generator rotor - Google Patents
Explosively welded radiant heat shield for a super conducting generator rotorInfo
- Publication number
- CA1200829A CA1200829A CA000421148A CA421148A CA1200829A CA 1200829 A CA1200829 A CA 1200829A CA 000421148 A CA000421148 A CA 000421148A CA 421148 A CA421148 A CA 421148A CA 1200829 A CA1200829 A CA 1200829A
- Authority
- CA
- Canada
- Prior art keywords
- tube
- circumferential
- grooves
- axial
- substance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K55/00—Dynamo-electric machines having windings operating at cryogenic temperatures
- H02K55/02—Dynamo-electric machines having windings operating at cryogenic temperatures of the synchronous type
- H02K55/04—Dynamo-electric machines having windings operating at cryogenic temperatures of the synchronous type with rotating field windings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Abstract
50,207 ABSTRACT OF THE DISCLOSURE
A radiant heat shield for use in superconducting generators is described which is formed by explosively welding an outer tube around an inner tube which has a plurality of coolant channels formed in its outer cylin-drical surface. These channels are filled with a remov-able substance prior to explosively welding the two tubes together and removed afterward.
A radiant heat shield for use in superconducting generators is described which is formed by explosively welding an outer tube around an inner tube which has a plurality of coolant channels formed in its outer cylin-drical surface. These channels are filled with a remov-able substance prior to explosively welding the two tubes together and removed afterward.
Description
Q.~32'9 1 50,207 EXPLOSIVELY WELDED RADIANT HEAT SHIELD
FOR A SUPERCONDUCTING GENERATOR ROTOR
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates generally to a superconducting generator rotor and more particularly to the radiant heat shield thereof.
Typically, a superconducting generator has a supercooled rotor which includes a superconducting field winding and a structure for supporting the winding. The rotor is supercooled to a cryogenic temperature by a fluid refrigerant, such as helium, which is contained within the rotor. During normal operation of the generator, the liquid helium within the rotor is transformed into a vapor or gas through a relatively slow but continuous boil off.
The function of the radiant heat shield is to intercept heat radiated from the rotor's ambient surround-ings, which are typically at room temperature, so as toprevent the radiated heat from warming the cryogenic cold zone within the rotor. A radiant heat shield typically consists of a tubular, or cylindrical, structure disposed radially outward from the superconducting rotor coils.
This tubular structure is provided with a p~urality of coolant channels therein along with a means for the re-~ ~ j ~n~,s
FOR A SUPERCONDUCTING GENERATOR ROTOR
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates generally to a superconducting generator rotor and more particularly to the radiant heat shield thereof.
Typically, a superconducting generator has a supercooled rotor which includes a superconducting field winding and a structure for supporting the winding. The rotor is supercooled to a cryogenic temperature by a fluid refrigerant, such as helium, which is contained within the rotor. During normal operation of the generator, the liquid helium within the rotor is transformed into a vapor or gas through a relatively slow but continuous boil off.
The function of the radiant heat shield is to intercept heat radiated from the rotor's ambient surround-ings, which are typically at room temperature, so as toprevent the radiated heat from warming the cryogenic cold zone within the rotor. A radiant heat shield typically consists of a tubular, or cylindrical, structure disposed radially outward from the superconducting rotor coils.
This tubular structure is provided with a p~urality of coolant channels therein along with a means for the re-~ ~ j ~n~,s
2 50,207 frigerant to pass radially into the radiant heat shield, pass axially through it and exit, via another radial passageway, toward the internal portion of the super-conducting rotor. U. S. Patent No. ~,250,~18 issued to Eckels on February 10, 1981 and U. S. Patent 4,319,149 issued March 9, 1982 to Eckels ~md assigned to the present assignee disclose, inter alia, particular designs of radiant heat shields. One object of the present invention is to provide a radiant heat shield for a superconducting generator which is designed to be manu-factured in a reliable and yet economical manner.
In a typical superconducting generator, the size of the radiant heat shield could exceed 130 inches in length and 30 inches in diameter and, since the radiant heat shield must be cooled with a plurality of coolant passages located within its cylindrical walls, these design parameters essentially require that it be made of a two-shell construction. The bonding of these two coaxial shells must provide an effectively sealed coolant channel network and must not distort the radiant heat shield nor weaken its structural integrity.
A radiant heat shield made in accordance with the present invention comprises an inner cylindrical tube and an outer cylindrical tube associated in coaxial and concentric relation. The inner tube has two circumferen-tial grooves formed in its outer cylindrical surface.
These two circumferential grooves are formed in the inner tube a predetermined axial distance apart from one anoth-er. A plurality of axially extending grooves are formed in the outer cylindrical surface of the inner tube, with each axial groove intersecting and connec-ting the two above-described circumferential grooves. Each circumfer-ential groove is also provided with at least one radial hole which intersects it and provides fluid communication between it and the internal portion of the inner tube. An outer cylinder is disposed radially outward from the inner 8'~
In a typical superconducting generator, the size of the radiant heat shield could exceed 130 inches in length and 30 inches in diameter and, since the radiant heat shield must be cooled with a plurality of coolant passages located within its cylindrical walls, these design parameters essentially require that it be made of a two-shell construction. The bonding of these two coaxial shells must provide an effectively sealed coolant channel network and must not distort the radiant heat shield nor weaken its structural integrity.
A radiant heat shield made in accordance with the present invention comprises an inner cylindrical tube and an outer cylindrical tube associated in coaxial and concentric relation. The inner tube has two circumferen-tial grooves formed in its outer cylindrical surface.
These two circumferential grooves are formed in the inner tube a predetermined axial distance apart from one anoth-er. A plurality of axially extending grooves are formed in the outer cylindrical surface of the inner tube, with each axial groove intersecting and connec-ting the two above-described circumferential grooves. Each circumfer-ential groove is also provided with at least one radial hole which intersects it and provides fluid communication between it and the internal portion of the inner tube. An outer cylinder is disposed radially outward from the inner 8'~
3 50,207 tube and metallurgically bonded to the inner tube to form a unitary radiant heat shleld structure. The outer tube encloses the radially outward portion of each of the above mentioned grooves and thus provides an enclosed coolant channel network which, in turn, provides fluid communica-tion between the radial hole which intersects one of the circumferential grooves and the radial hole which inter-sects the other circumferential groove.
In accordance with the present invention, the inner and outer tubes are explosively welded together. In order to prevent the potential collapsing of the outer tube into the grooves of the inner tube during the ex-plosive welding operation, the grooves may be filled with a removable substance prior to the expl~sive welding process to provide local support for the outer tube during the explosive welding process. Depending on the relative thicknesses of the inner and outer tubes, the use of this substance may not be required. However, in order to assure that no collapse occurs in the region of the above mentioned grooves, a radiant heat shield made in accord-ance with the present invention incorporates within its scope a solid which can be disposed in the grooves and which is removable after completion of the explosive welding. This substance may be either meltable, such as a low melting metal or sulfur, or combustible, such as polystyrene. Experimental work has been done using a low melting alloy, Cerrotru, which can be melted and removed from the coolant channels following the explosive welding procedure. Also, carbon steel inserts have been used to provide local support in the region of the coolant chan-nels and were later removed by etching with acid. Of course, it should be apparent that this acid etching technique is practical only when the radiant heat shield's structural tubes are acid resistant, such as in the case when Inconel 706 or Inconel 718 is used for their manu-facture. After providing the localized support described above, tne meltable, etchable or combustible substance is removed through the above-described radial holes.
~L2(~
In accordance with the present invention, the inner and outer tubes are explosively welded together. In order to prevent the potential collapsing of the outer tube into the grooves of the inner tube during the ex-plosive welding operation, the grooves may be filled with a removable substance prior to the expl~sive welding process to provide local support for the outer tube during the explosive welding process. Depending on the relative thicknesses of the inner and outer tubes, the use of this substance may not be required. However, in order to assure that no collapse occurs in the region of the above mentioned grooves, a radiant heat shield made in accord-ance with the present invention incorporates within its scope a solid which can be disposed in the grooves and which is removable after completion of the explosive welding. This substance may be either meltable, such as a low melting metal or sulfur, or combustible, such as polystyrene. Experimental work has been done using a low melting alloy, Cerrotru, which can be melted and removed from the coolant channels following the explosive welding procedure. Also, carbon steel inserts have been used to provide local support in the region of the coolant chan-nels and were later removed by etching with acid. Of course, it should be apparent that this acid etching technique is practical only when the radiant heat shield's structural tubes are acid resistant, such as in the case when Inconel 706 or Inconel 718 is used for their manu-facture. After providing the localized support described above, tne meltable, etchable or combustible substance is removed through the above-described radial holes.
~L2(~
4 ~0,207 The present invention provides a radiant heat shield which has good contact between the adjacent sur-faces of the inner and outer tubes to provide excellent thermal conductivity ~herebetween and prevents leakage of coolant either between adjacent axial grooves or between the coolant channel network and its surrounding environ-ment which is generally a vacuum.
Prior to assembly, the inner and outer tubes can be initially oversized so that they may be machined exact-ly to size following the explosive welding procedure.Also, the radial holes may be remachined following the explosive welding process in order to correct for any minor distortions incurred during the metallurgical bond-ing process It should be apparent that the present invention provides a radiant heat shield, for use with superconduct-ing rotors, that is manufacturable in a manner which results in a structure of high mechanical integrity and which also provides a reliable fluid containment for the superconducting rotor's refrigerant.
BRIEF DESCRITION OF THE DRAWING
Figure 1 shows an exemplary sectioned view of a radiant heat shield made in accordance with the present invention; and Figure 2 illustrates a cross section view of the radiant heat shield shown in Figure 1.
DES~RIPTION OF THE PREFERRED EM~ODIMENT
The present invention relates generally to superconducting rotors and, more specifically, to the manufacture of the radiant heat shield utili7ed therein.
Figure 1 shows an exemplary illustration of a radiant heat shield made in accordance with the present invention. It comprises an inner tube 10 and an outer tube 12 disposed in coaxial and concentric relation. The inner cylindrical tube lO has a first 14 and a second 16 circumferential groove formed in its outer cylindrical surface. A plurali~y of axial grooves 18 intersect these 50,207 circumferential grooves and provide fluid communication therebetween. Circumferential groove 14 has a radial hole intersecting it and pro~riding fluid communication between it and the internal portion of the inner tube 10.
The second circumferential groove 16 has a radlal hole 22 intersecting it and providing fluid communication between it and the internal portion of the inner tube 10. The combination of the first 14 and second 16 circumferential grooves along with the plurality of axial grooves 18 and radial holes, 20 and 22, provide fluid communication between the internal portion of the inner tube 10 pro~i-mate the radial tube 20 and the internal portion of the radial tube 10 proximate the radial hole 22. Both the inner 10 and outer 12 tubes are made of a high s~rength material, such as one of those referred to as superalloys, which has a yield strength sufficient for use in super-conducting~ These materials include, but are not limited to, Inconel 706 and Inconel 718. The material used should have a yield strength equal to or greater than 130,000 psi and retain its high strength at cryogenic temperatures of approximately 4K.
The outer tube 12 is explosively welded to the inner tube lO to form a radially outward seal for the above mentioned circumferential, 14 and 16, and axial 18 grooves. This construction provides a coolant channel network which carries liquid or gaseous refrigerant be-tween components which are disposed inside the inner tube lO proximate the radial hole 20 and other components disposed within the inner tube 10 and located proximate the radial hole 22.
Prior to the outer tube 12 being explosively welded to the inner tube lO, the circumferential grooves, 14 and 16, and the axial grooves 18 can be filled with a substance in order to prevent the outer tube 12 from locally collapsing into the grooves in the outer surface of the inner tube 10. This substance, of course, must be removable following the explosive welding process. A
~IQ~
6 50,207 radiant heat shield made in accordance with the present invention can utilize either a meltable substance such as a low melting metal or sulfur, or a combustible substance, such as polystyrene. It has been found that a 15w melting alloy, such as Cerrotru, is suitable. Also, carbon steel has been experimentally used to provide this local support and later be etched away by acid. Acid etching is practi-cal when the inner lO and outer 12 cylinders are made of a material which is acid resistant, such as Inconel 706 or Inconel 718. These specific removable substances, or other suitable substances, provide local support for the outer cylinder 12 in the region of the grooves in the outer cylindrical surface of the inner tube 10 during the explosive welding operation and are later removed through lS the radial holes, 20 or 22, following that procedure.
Explosively welding the inner 10 and outer 12 tubes together provides a reliable fluid seal in the axially outboard regions, 30 and 32, which are between the circumferential grooves, 14 and 16, and the surrounding environment and also provides a reliable fluid seal in the regions 40 between adjacent axial channels 18.
Figure 2 is a section view of Figure l showing the inner 10 and outer 12 tubes. Also, the relative radial positions of the axial grooves 18 and the circum-ferential groove 14 is shown. The radial hole 20 is shownintersecting the circumferential groove 14 and providing fluid communication between it and the internal portion of the inner tube lO. Figure 2, viewed in conjunction with Figure 1, illustrates how a coolant could travel radially outward through radial hole 20, circumferentially around the inner tube in circumferential groove 14, axially between the inner 10 and outer 12 tubes in channels 18, circumferentially around circumferential channel 16 and radially inward through radial hole 22, to provide a network for the coolant to travel through, and reduce the temperature of, the radiant heat shield.
7 50,207 Referring again to F:igure 1, it should be under-stood that a seal weld could also be provided at the interface of the inner 10 and outer 12 tubes at their axial ends 50 in order to provide an added measure of S fluid sealing reliability between the coolant channel network and the environment surrounding the radiant heat shield which is typically a vacuum. However, it should be understood that, in most applications, the explosive welding of the inner tube 10 to the outer tube 12 provides a sufficient fluid seal in the regions, 30 and 32, between the circumferential grooves and the environment surround-ing the radiant heat shield, and that the above-mentioned seal weld wou.ld therefore generally not be rec;uired.
It should be apparent that t~e present invention provides a radiant heat shield for use in a superconduct-ing rotor which is mechanically strong and which provides a coolant network therein. It should further be apparent that, although the present invention has been described with considerable detail, it should not be considered tc be so limited.
Prior to assembly, the inner and outer tubes can be initially oversized so that they may be machined exact-ly to size following the explosive welding procedure.Also, the radial holes may be remachined following the explosive welding process in order to correct for any minor distortions incurred during the metallurgical bond-ing process It should be apparent that the present invention provides a radiant heat shield, for use with superconduct-ing rotors, that is manufacturable in a manner which results in a structure of high mechanical integrity and which also provides a reliable fluid containment for the superconducting rotor's refrigerant.
BRIEF DESCRITION OF THE DRAWING
Figure 1 shows an exemplary sectioned view of a radiant heat shield made in accordance with the present invention; and Figure 2 illustrates a cross section view of the radiant heat shield shown in Figure 1.
DES~RIPTION OF THE PREFERRED EM~ODIMENT
The present invention relates generally to superconducting rotors and, more specifically, to the manufacture of the radiant heat shield utili7ed therein.
Figure 1 shows an exemplary illustration of a radiant heat shield made in accordance with the present invention. It comprises an inner tube 10 and an outer tube 12 disposed in coaxial and concentric relation. The inner cylindrical tube lO has a first 14 and a second 16 circumferential groove formed in its outer cylindrical surface. A plurali~y of axial grooves 18 intersect these 50,207 circumferential grooves and provide fluid communication therebetween. Circumferential groove 14 has a radial hole intersecting it and pro~riding fluid communication between it and the internal portion of the inner tube 10.
The second circumferential groove 16 has a radlal hole 22 intersecting it and providing fluid communication between it and the internal portion of the inner tube 10. The combination of the first 14 and second 16 circumferential grooves along with the plurality of axial grooves 18 and radial holes, 20 and 22, provide fluid communication between the internal portion of the inner tube 10 pro~i-mate the radial tube 20 and the internal portion of the radial tube 10 proximate the radial hole 22. Both the inner 10 and outer 12 tubes are made of a high s~rength material, such as one of those referred to as superalloys, which has a yield strength sufficient for use in super-conducting~ These materials include, but are not limited to, Inconel 706 and Inconel 718. The material used should have a yield strength equal to or greater than 130,000 psi and retain its high strength at cryogenic temperatures of approximately 4K.
The outer tube 12 is explosively welded to the inner tube lO to form a radially outward seal for the above mentioned circumferential, 14 and 16, and axial 18 grooves. This construction provides a coolant channel network which carries liquid or gaseous refrigerant be-tween components which are disposed inside the inner tube lO proximate the radial hole 20 and other components disposed within the inner tube 10 and located proximate the radial hole 22.
Prior to the outer tube 12 being explosively welded to the inner tube lO, the circumferential grooves, 14 and 16, and the axial grooves 18 can be filled with a substance in order to prevent the outer tube 12 from locally collapsing into the grooves in the outer surface of the inner tube 10. This substance, of course, must be removable following the explosive welding process. A
~IQ~
6 50,207 radiant heat shield made in accordance with the present invention can utilize either a meltable substance such as a low melting metal or sulfur, or a combustible substance, such as polystyrene. It has been found that a 15w melting alloy, such as Cerrotru, is suitable. Also, carbon steel has been experimentally used to provide this local support and later be etched away by acid. Acid etching is practi-cal when the inner lO and outer 12 cylinders are made of a material which is acid resistant, such as Inconel 706 or Inconel 718. These specific removable substances, or other suitable substances, provide local support for the outer cylinder 12 in the region of the grooves in the outer cylindrical surface of the inner tube 10 during the explosive welding operation and are later removed through lS the radial holes, 20 or 22, following that procedure.
Explosively welding the inner 10 and outer 12 tubes together provides a reliable fluid seal in the axially outboard regions, 30 and 32, which are between the circumferential grooves, 14 and 16, and the surrounding environment and also provides a reliable fluid seal in the regions 40 between adjacent axial channels 18.
Figure 2 is a section view of Figure l showing the inner 10 and outer 12 tubes. Also, the relative radial positions of the axial grooves 18 and the circum-ferential groove 14 is shown. The radial hole 20 is shownintersecting the circumferential groove 14 and providing fluid communication between it and the internal portion of the inner tube lO. Figure 2, viewed in conjunction with Figure 1, illustrates how a coolant could travel radially outward through radial hole 20, circumferentially around the inner tube in circumferential groove 14, axially between the inner 10 and outer 12 tubes in channels 18, circumferentially around circumferential channel 16 and radially inward through radial hole 22, to provide a network for the coolant to travel through, and reduce the temperature of, the radiant heat shield.
7 50,207 Referring again to F:igure 1, it should be under-stood that a seal weld could also be provided at the interface of the inner 10 and outer 12 tubes at their axial ends 50 in order to provide an added measure of S fluid sealing reliability between the coolant channel network and the environment surrounding the radiant heat shield which is typically a vacuum. However, it should be understood that, in most applications, the explosive welding of the inner tube 10 to the outer tube 12 provides a sufficient fluid seal in the regions, 30 and 32, between the circumferential grooves and the environment surround-ing the radiant heat shield, and that the above-mentioned seal weld wou.ld therefore generally not be rec;uired.
It should be apparent that t~e present invention provides a radiant heat shield for use in a superconduct-ing rotor which is mechanically strong and which provides a coolant network therein. It should further be apparent that, although the present invention has been described with considerable detail, it should not be considered tc be so limited.
Claims (13)
1. A radiant heat shield, comprising:
an inside tube having a plurality of axial grooves in its outer cylindrical surface, said inside tube having a first and a second circumferential groove in its outer cylindrical surface, said first circumferential groove being in fluid communication with one axial terminus of each of said plurality of axial grooves, said second circumferential groove being in fluid communication with the other axial terminus of each of said plurality of axial grooves, said inside tube having at least one radial hole intersecting each circumferential groove and providing fluid communication between its associated circumferential grooves and the internal surface of said inside tube; and an outer tube disposed around said inner tube in co-axial and concentric relation therewith, said outer tube and said inner tube having a direct metallurgical bond along their adjacent cylindrical surfaces to form a radially outward seal for said grooves.
an inside tube having a plurality of axial grooves in its outer cylindrical surface, said inside tube having a first and a second circumferential groove in its outer cylindrical surface, said first circumferential groove being in fluid communication with one axial terminus of each of said plurality of axial grooves, said second circumferential groove being in fluid communication with the other axial terminus of each of said plurality of axial grooves, said inside tube having at least one radial hole intersecting each circumferential groove and providing fluid communication between its associated circumferential grooves and the internal surface of said inside tube; and an outer tube disposed around said inner tube in co-axial and concentric relation therewith, said outer tube and said inner tube having a direct metallurgical bond along their adjacent cylindrical surfaces to form a radially outward seal for said grooves.
2. A superconducting rotor, comprising:
a first tube having two circumferential grooves in its outer cylindrical surface, said circumferential grooves being disposed a preselected axial distance from each other, said first tube having a plurality of axial grooves in its outer cylindrical surface, each of said plurality of axial grooves intersecting each of said two circumferential grooves and providing fluid communication between said two circumferential grooves;
a second tube disposed around said first tube in coaxial relation therewith with a direct metallurgical bond therebetween forming a radially outward seal for said grooves;
and 9 50,207 said first tube having a radial hole intersecting each of said circumferential grooves and providing fluid communication between each of said circumferential grooves and the inner portion of said first tube.
a first tube having two circumferential grooves in its outer cylindrical surface, said circumferential grooves being disposed a preselected axial distance from each other, said first tube having a plurality of axial grooves in its outer cylindrical surface, each of said plurality of axial grooves intersecting each of said two circumferential grooves and providing fluid communication between said two circumferential grooves;
a second tube disposed around said first tube in coaxial relation therewith with a direct metallurgical bond therebetween forming a radially outward seal for said grooves;
and 9 50,207 said first tube having a radial hole intersecting each of said circumferential grooves and providing fluid communication between each of said circumferential grooves and the inner portion of said first tube.
3. A radiant heat shield in accordance with claim 1 wherein:
said inner tube and said outer tube are each of a material having a yield strength of at least 130,000 psi.
said inner tube and said outer tube are each of a material having a yield strength of at least 130,000 psi.
4. A superconducting rotor in accordance with claim 2 wherein:
said first and second tubes are each of a superalloy having a yield strength of at least 130,000 psi.
said first and second tubes are each of a superalloy having a yield strength of at least 130,000 psi.
5. A method for manufacturing a radiant heat shield, comprising:
providing a first tubular member;
forming two circumferential channels in the outer cylindrical surface of said first tubular member, said circumferential channels being positioned a predetermined axial distance apart;
forming a plurality of axial channels in the outer cylindrical surface of said first tubular member, each of said plurality of axial channels intersecting each of said two circumferential channels and providing fluid communication between said two circumferential channels;
forming two radial holes through the wall of said first tubular member, one of said two holes inter-secting a preselected one of said two circumferential channels and the other of said two holes intersecting the other of said two circumferential channels;
disposing a second tubular member around and coaxial with said first tubular member;
explosively welding said first and second tubular member together.
providing a first tubular member;
forming two circumferential channels in the outer cylindrical surface of said first tubular member, said circumferential channels being positioned a predetermined axial distance apart;
forming a plurality of axial channels in the outer cylindrical surface of said first tubular member, each of said plurality of axial channels intersecting each of said two circumferential channels and providing fluid communication between said two circumferential channels;
forming two radial holes through the wall of said first tubular member, one of said two holes inter-secting a preselected one of said two circumferential channels and the other of said two holes intersecting the other of said two circumferential channels;
disposing a second tubular member around and coaxial with said first tubular member;
explosively welding said first and second tubular member together.
6. The method of claim 5, further comprising:
filling said axial and circumferential channels with a removable substance prior to the explosively weld-ing step; and removing said removable substance after said explosively welding step.
50,207
filling said axial and circumferential channels with a removable substance prior to the explosively weld-ing step; and removing said removable substance after said explosively welding step.
50,207
7. The method of claim 6, wherein:
said removable substance is removed through a preselected one of two radial holes.
said removable substance is removed through a preselected one of two radial holes.
8. The method of claim 6, wherein:
said substance has a low melting point.
said substance has a low melting point.
9. The method of claim 6, wherein:
said substance is combustible.
said substance is combustible.
10. The method of claim 6, wherein:
said substance is capable of being etched with an acid.
said substance is capable of being etched with an acid.
11. The method of claim 8, wherein:
the substance is a low melting metal.
the substance is a low melting metal.
12. The method of claim 8, wherein:
the substance is sulphur.
the substance is sulphur.
13. The method of claim 9, wherein:
the substance is polystyrene.
the substance is polystyrene.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US35448782A | 1982-03-03 | 1982-03-03 | |
| US354,487 | 1982-03-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1200829A true CA1200829A (en) | 1986-02-18 |
Family
ID=23393551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000421148A Expired CA1200829A (en) | 1982-03-03 | 1983-02-08 | Explosively welded radiant heat shield for a super conducting generator rotor |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS58159656A (en) |
| CA (1) | CA1200829A (en) |
| DE (1) | DE3306985A1 (en) |
| FR (1) | FR2522897B1 (en) |
| GB (1) | GB2119582B (en) |
| IT (1) | IT1170114B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6953143B2 (en) * | 2003-04-11 | 2005-10-11 | Advanced Energy Industries, Inc. | Explosion welded design for cooling components |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5342105B2 (en) * | 1974-06-05 | 1978-11-09 | ||
| US4250418A (en) * | 1978-05-11 | 1981-02-10 | Electric Power Research Institute, Inc. | Superconducting generator and method |
| US4275320A (en) * | 1978-05-11 | 1981-06-23 | Electric Power Research Institute, Inc. | Radiation shield for use in a superconducting generator or the like and method |
| JPS558265A (en) * | 1978-07-05 | 1980-01-21 | Hitachi Ltd | Method of manufacturing electromagnetic shield of superconductive rotor |
| JPS5592567A (en) * | 1978-12-29 | 1980-07-14 | Mitsubishi Electric Corp | Rotor for super conductive generator |
| US4319149A (en) * | 1980-04-24 | 1982-03-09 | Electric Power Research Institute, Inc. | Superconducting generator with improved thermal transient response |
-
1983
- 1983-02-08 CA CA000421148A patent/CA1200829A/en not_active Expired
- 1983-02-15 GB GB08305110A patent/GB2119582B/en not_active Expired
- 1983-02-28 DE DE19833306985 patent/DE3306985A1/en not_active Withdrawn
- 1983-02-28 JP JP58032696A patent/JPS58159656A/en active Pending
- 1983-03-01 IT IT19845/83A patent/IT1170114B/en active
- 1983-03-02 FR FR8303422A patent/FR2522897B1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2522897B1 (en) | 1986-05-30 |
| JPS58159656A (en) | 1983-09-22 |
| GB8305110D0 (en) | 1983-03-30 |
| DE3306985A1 (en) | 1983-09-08 |
| GB2119582B (en) | 1986-05-21 |
| IT1170114B (en) | 1987-06-03 |
| FR2522897A1 (en) | 1983-09-09 |
| IT8319845A0 (en) | 1983-03-01 |
| GB2119582A (en) | 1983-11-16 |
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