US3367406A - Helical wound strip regenerator - Google Patents

Helical wound strip regenerator Download PDF

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US3367406A
US3367406A US480695A US48069565A US3367406A US 3367406 A US3367406 A US 3367406A US 480695 A US480695 A US 480695A US 48069565 A US48069565 A US 48069565A US 3367406 A US3367406 A US 3367406A
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Prior art keywords
strip
regenerator
slots
plates
ribs
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US480695A
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Vonk Gerben
Zwagerman Hermen
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US Philips Corp
North American Philips Co Inc
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US Philips Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D17/00—Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body is contacted successively by each heat-exchange medium, e.g. using granular particles
    • F28D17/02—Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body is contacted successively by each heat-exchange medium, e.g. using granular particles using rigid bodies, e.g. of porous material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F02G1/053—Component parts or details
    • F02G1/057—Regenerators
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49357—Regenerator or recuperator making

Definitions

  • FIGA INVENTOR GERBEN VON K HERMEN ZWAGERMAN BY l F i; GENT Unite States Patent Oilice 3,357,4@6 Patented Feb. 6, 1968 3,367,406 HELICAL WUND STRIP REGENERATGR Gerben Vonk and Hermen Zwagerman, Emmasiugel,
  • the invention relates to a regenerator comp-rising la housing with one or more filling masses arranged therein under pretension which lling masses are formed by a wound strip of a perforated material.
  • regenerator has the advantage that between the various flow ducts in the regenerator, transverse exchange .of medium is possible.
  • a further advantage is that as a result of the perfor-ations the heat conductivity of the strip of material in the direction of llow of the regenerator is reduced.
  • Regenerators which have to operate in the very low temperature range must have a filling mass which is manufactured from a material which has a comparatively high specific heat at the said low temperatures.
  • the materials which are to be considered for the said purpose are all rather soft.
  • the said regenerators must have a very high space factor, it being required for the material to be distributed as evenly as possible to ensure a large heat transmitting surface.
  • the regenerator accord-ing to the invention meets all the said requirements and is characterized in that the material from which the strip is manufactured, has a high specific heat at very low temperatures, the strip being provided with ribs extending at right angles to the longitudinal direction of the strip.
  • the ribs ensure that also in 'the case of a 4taut winding, the successive turns do not engage one another. As a result of this a particularly evenly distributed filling mass is obtained.
  • the material of the strip is lead.
  • the strip h-as a thickness of approximately 100,11. (100 microns) and the ribs have a height of at most 50p., the perforations being ⁇ formed by slots which are arranged in rows extending in parallel with one another and in the longitudinal direction of the strip, the mu-tual distance between the rows being approximately 200;. and the width of the slots being in the order of magnitude of 50p..
  • the slots enable the medium, which in the regenerator according to the invention flows in narrow ducts between two turns and two ribs, to ovv from one duct into the other duct.
  • the present regenerator may be manufactured according to the invention by tirst rolling a strip of material 'by tmeans of a first shaped rolling device so that a number of recesses arranged in parallel rows is formed the bottom of which has a smaller thickness than the strip, the strip then being subjected to an etch-ing treatment by which a layer of material is removed of which the thickness at least corresponds to the thickness of the bottom of the recesses, the strip then being passed through a second 'shaped rolling dev-ice which provides the strip with ribs.
  • the strip of material before subjecting the strip of material to the etching treatment it may be provided on one side with a coating layer which is not attacked by the etching agent. This results in a .saving of material because in this case a layer of material is etched away only :on one side.
  • a device for performing the said method comprising la lirst shaped rolling device which is constructed from a number of plates o'f a harder material yand a number of plates of a harder material which are alternately arranged on a shaft, the radius of the softer plates being smaller than the radius of the harder plat-es by substantially the
  • the harder plates of the tirs-t shaped rolling device have a thickness in the order of magnitude of 50p, and the softer plates have a thickness of .approximately 200a, the plates, after having been arranged on the shaft, being turned-off and provided with axial notches, the assembly being the subjected to an etching treatment or an electro-lytic treatment so that the dif Schlieren'ce in diameter between the harder plates and the softer plates is substantially t-wice the thickness of the strip of material to be processed.
  • the material for the harder plates is steel land that for the softer plates is copper.
  • FIGURES la, lb and 1c diagrammatically show three yperpendicular cross-sectional views of Ia strip of material suitable to be rolled to a regenerator filling mass.
  • lFIGURES 2a and 2b diagrammatically show a plan view .and a cross-sectional view respectively of a regenerator lilling mass consist-ing of a coil strip of material as shown in FIGURE l.
  • FIGURE 3 diagramfmatically shows a shaped rolling device ⁇ for providing recesses in a strip of material.
  • FIGURE 4 diagrammatically shows a side elevation of a plate of the shaped rolling device shown in FIGURE 3.
  • reference numeral 1 denotes a strip of a material which at very low temperatures still has 4a comparatively high specitic heat, Ifor example, lead.
  • the strip 1 is provided with a number of slots 2, which are arranged in rows.
  • the strip further comprises a number of ribs 3.
  • the thickness is e while the ribs have a height of 40a.
  • the slots 2 have a width of 50a, while the distance between the rows of slots is ZOO/r After w-inding the strip on a core 4, a particularly even and nely distributed filling material with a very high space factor is obtained with these dimensions.
  • the coiled strip is diagramtmatically shown in FIGURE 2.
  • the provision of the slots is particularly diicult. This is done by rst passing the strip through a shaped rolling device which provides recesses in the strip. The bottoms of the recesses are then removed by etching.
  • the shaped rolling device for providing the recesses is fdiagrammatically shown in FIGURE 3.
  • This shaped rolling device comprises a shaft 6 on which a number of plates 7 and 8 are alternately arranged.
  • the plates 7 are manufactured from copper and have a thickness which corresponds to the distance between the rows of slots.
  • the pla-tes S are manufactured irom steel and have a thickness which corresponds :to the width of the slots.
  • the coiled strip is then dipped in an etching bath.
  • the etching agent will attack the plates 7 of copper more rapidly than the steel plates 8. After some time, the plates 7 have a diameter which is smaller than the diameter of the plate 8 by twice the thickness of the strip 1. In this comparatively simple manner a shaped rolling device is obtained with which recesses of the desired smlall dimensions can be provided in the strip.
  • T'he ribs 3 can be provided on the strip by means of a suitably shaped roll-ing device.
  • the invention provides a regenerator which operates yreadily in the low temperature range, as well as a method of and a device for manufacturing the said regenerator.
  • a regenerator having a medium tlow therethrough comprising a housing, a lling mass in said housing constituted lof a helically ywound strip having spaced slots therein, said Wound strip being of a material having a 'high specific heat at relatively low temperatures, said strip of material being provided with ribs extending at right angles to the longitudinal direction of said strip whereby narrow ducts are formed parallel to the longi- ⁇ tudinal axis of said wound strip, said slots and ducts being substantially perpendicular to each other, and the medium flow through said slots being perpendicular to the medium ow through said narrow ducts, said strip having a thickness of approximately 100g, the ribs having a height of at most 50M, said slots being arranged in substantially parallel rows and extending in the direction 'of the lonigtudinal axis of said strip, the distance between adjacent rows being about 200,11. and the width of each of said slots being about 50a.
  • regenerator as claimed in cla-im 1 wherein said Ihelically wound strip is lead.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Description

Feb. 6, 1968 G. VONK ETAl. 3,367,406
HELICAL WOUND STRIP REGENERATOR Filed Aug. 18, 1965 b 1:1 1:; E :l c: :I 1::1 1:: l: j L l C, E E :Il E E s 1:! :l
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FIC-3.3 FIGA INVENTOR GERBEN VON K HERMEN ZWAGERMAN BY l F i; GENT Unite States Patent Oilice 3,357,4@6 Patented Feb. 6, 1968 3,367,406 HELICAL WUND STRIP REGENERATGR Gerben Vonk and Hermen Zwagerman, Emmasiugel,
Eindhoven, Netherlands, assguors to North American Philips Company, Inc., New York, N.Y., a corporation of Delaware Filed Aug. 18, 1965, Ser. No. 480,695 Claims priority, application Netherlands, Aug. 20, 1964, 6ft- 9,596 2 Claims. (Cl. 16S-l0) ABSTRACT F THE DISCLOSURE A regenerator for use in devices operating at very low temperatures and having a helical wound slotted strip Iwith ribs thereon to form narrow ducts located perpendicular to the plane of t-he slots in the strip.
The invention relates to a regenerator comp-rising la housing with one or more filling masses arranged therein under pretension which lling masses are formed by a wound strip of a perforated material.
IThis known regenerator has the advantage that between the various flow ducts in the regenerator, transverse exchange .of medium is possible. A further advantage is that as a result of the perfor-ations the heat conductivity of the strip of material in the direction of llow of the regenerator is reduced.
A drawback of this known construction, however, is that adjacent turns of the filling mass will become to engage one another, as a result of which the heat transmitting surface is reduced. This draw-back is more prominent Aaccording as the material of the strip is softer.
Regenerators which have to operate in the very low temperature range must have a filling mass which is manufactured from a material which has a comparatively high specific heat at the said low temperatures. The materials which are to be considered for the said purpose are all rather soft. In addition, the said regenerators must have a very high space factor, it being required for the material to be distributed as evenly as possible to ensure a large heat transmitting surface.
The regenerator accord-ing to the invention meets all the said requirements and is characterized in that the material from which the strip is manufactured, has a high specific heat at very low temperatures, the strip being provided with ribs extending at right angles to the longitudinal direction of the strip. The ribs ensure that also in 'the case of a 4taut winding, the successive turns do not engage one another. As a result of this a particularly evenly distributed filling mass is obtained. In a further preferred embodiment of the regenerator according to the invention, the material of the strip is lead.
According to a further favourable embodiment of the device according to the invention, the strip h-as a thickness of approximately 100,11. (100 microns) and the ribs have a height of at most 50p., the perforations being `formed by slots which are arranged in rows extending in parallel with one another and in the longitudinal direction of the strip, the mu-tual distance between the rows being approximately 200;. and the width of the slots being in the order of magnitude of 50p..
The slots enable the medium, which in the regenerator according to the invention flows in narrow ducts between two turns and two ribs, to ovv from one duct into the other duct. As a result of the above dimensions a regenerator has been ,obtained with a very evenly finely distributed lilling mass, a large heat-transmitting surface and a high space factor of approximately 80 to 90%.
The present regenerator may be manufactured according to the invention by tirst rolling a strip of material 'by tmeans of a first shaped rolling device so that a number of recesses arranged in parallel rows is formed the bottom of which has a smaller thickness than the strip, the strip then being subjected to an etch-ing treatment by which a layer of material is removed of which the thickness at least corresponds to the thickness of the bottom of the recesses, the strip then being passed through a second 'shaped rolling dev-ice which provides the strip with ribs.
According to the invention, before subjecting the strip of material to the etching treatment it may be provided on one side with a coating layer which is not attacked by the etching agent. This results in a .saving of material because in this case a layer of material is etched away only :on one side.
A device for performing the said method comprising la lirst shaped rolling device which is constructed from a number of plates o'f a harder material yand a number of plates of a harder material which are alternately arranged on a shaft, the radius of the softer plates being smaller than the radius of the harder plat-es by substantially the |thickness of the strip, the harder plates being prov-ided with recesses at regular distances .and the device comprising an etching bath and a second shaped rolling device for providing ribs in the strip of material.
`In this oase the harder plates of the tirs-t shaped rolling device :have a thickness in the order of magnitude of 50p, and the softer plates have a thickness of .approximately 200a, the plates, after having been arranged on the shaft, being turned-off and provided with axial notches, the assembly being the subjected to an etching treatment or an electro-lytic treatment so that the difieren'ce in diameter between the harder plates and the softer plates is substantially t-wice the thickness of the strip of material to be processed. As a result of this it is reached, that during the provision of the recesses, the strip of mate'rilal is readily forced against the base plate. According to the invention, the material for the harder plates is steel land that for the softer plates is copper.
In order that the invention may readily be carried into effect, it will now be described in greater detail, by way of example, with reference to the accompanying drawing, in which:
FIGURES la, lb and 1c diagrammatically show three yperpendicular cross-sectional views of Ia strip of material suitable to be rolled to a regenerator filling mass.
lFIGURES 2a and 2b diagrammatically show a plan view .and a cross-sectional view respectively of a regenerator lilling mass consist-ing of a coil strip of material as shown in FIGURE l.
|FIGURE 3 diagramfmatically shows a shaped rolling device `for providing recesses in a strip of material.
FIGURE 4 diagrammatically shows a side elevation of a plate of the shaped rolling device shown in FIGURE 3.
lReferring now to FIGURE 1, reference numeral 1 denotes a strip of a material which at very low temperatures still has 4a comparatively high specitic heat, Ifor example, lead. The strip 1 is provided with a number of slots 2, which are arranged in rows. The strip further comprises a number of ribs 3. In a practical embodiment of the strip the thickness is e while the ribs have a height of 40a. The slots 2 have a width of 50a, while the distance between the rows of slots is ZOO/r After w-inding the strip on a core 4, a particularly even and nely distributed filling material with a very high space factor is obtained with these dimensions. The coiled strip is diagramtmatically shown in FIGURE 2. From this figure is appears that the successive turns are kept spaced by the ribs 3. As a result of this, narrow ducts 5 are created between the turns and each pair of ribs. In this type of regenerator it is of great importance that the medium can 3 flow trom one duct into the other duct. Tfhis ow is possible in the filling mass according to the invention as a resultof the slots 2. In addition, the slots 2 restrict the thermal conductivity of the strip in the direction of flow. In this manner an extremely readily operating regenerator for operating at very low temperatuers is obtained.
Asa result of the very small dimensions, the provision of the slots is particularly diicult. This is done by rst passing the strip through a shaped rolling device which provides recesses in the strip. The bottoms of the recesses are then removed by etching.
The shaped rolling device for providing the recesses is fdiagrammatically shown in FIGURE 3. This shaped rolling device comprises a shaft 6 on which a number of plates 7 and 8 are alternately arranged. The plates 7 are manufactured from copper and have a thickness which corresponds to the distance between the rows of slots. The pla-tes S are manufactured irom steel and have a thickness which corresponds :to the width of the slots. The plates 7 and 8, after lhaving been provided on the shaft 6, a-re turned-01T so that they have the same diameter. Slots are then provided at regular distances in the plates 7 and 8 as is shown in FIGURE 4 for `one plate 8.
The coiled strip is then dipped in an etching bath. The etching agent will attack the plates 7 of copper more rapidly than the steel plates 8. After some time, the plates 7 have a diameter which is smaller than the diameter of the plate 8 by twice the thickness of the strip 1. In this comparatively simple manner a shaped rolling device is obtained with which recesses of the desired smlall dimensions can be provided in the strip.
T'he ribs 3 can be provided on the strip by means of a suitably shaped roll-ing device.
The invention provides a regenerator which operates yreadily in the low temperature range, as well as a method of and a device for manufacturing the said regenerator.
What is claimed is:
`1. A regenerator having a medium tlow therethrough comprising a housing, a lling mass in said housing constituted lof a helically ywound strip having spaced slots therein, said Wound strip being of a material having a 'high specific heat at relatively low temperatures, said strip of material being provided with ribs extending at right angles to the longitudinal direction of said strip whereby narrow ducts are formed parallel to the longi- `tudinal axis of said wound strip, said slots and ducts being substantially perpendicular to each other, and the medium flow through said slots being perpendicular to the medium ow through said narrow ducts, said strip having a thickness of approximately 100g, the ribs having a height of at most 50M, said slots being arranged in substantially parallel rows and extending in the direction 'of the lonigtudinal axis of said strip, the distance between adjacent rows being about 200,11. and the width of each of said slots being about 50a.
2. A regenerator as claimed in cla-im 1 wherein said Ihelically wound strip is lead.
References Cited UNITED STATES PATENTS 3,200,877 8/1965 Lehmer et al. 165-4 3,216.484 dll/1965 Gifford 165-4 FOREIGN PATENTS 1,059,461 11/1953 France. 1,324,372 3/1963 France.
ROBERT A. OLEARY, Primary Examiner.
A. W. DAVIS, JR., Assistant Examiner.
US480695A 1964-08-20 1965-08-18 Helical wound strip regenerator Expired - Lifetime US3367406A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3789494A (en) * 1972-04-24 1974-02-05 Aga Ab Method of spirally winding strip to produce pinned units
US4866943A (en) * 1988-10-17 1989-09-19 Cdc Partners Cyrogenic regenerator
EP0339298A1 (en) * 1988-04-14 1989-11-02 Leybold Aktiengesellschaft Method of making a regenerator for a cryogenic refrigeration machine, and regenerator made according to this method
US5012650A (en) * 1989-10-11 1991-05-07 Apd Cryogenics, Inc. Cryogen thermal storage matrix
EP0576202A1 (en) * 1992-06-24 1993-12-29 Gec-Marconi Limited Refrigerator
WO1995002161A2 (en) * 1993-07-09 1995-01-19 Sierra Regenerators, Inc. Foil generator
US6347453B1 (en) * 1998-05-22 2002-02-19 Matthew P. Mitchell Assembly method for concentric foil regenerators
US20030010473A1 (en) * 2001-07-10 2003-01-16 Mitchell Matthew P. Foil structure for regenerators
WO2020191479A1 (en) * 2019-03-28 2020-10-01 Etalim Inc. Thermal regenerator apparatus
US11466938B2 (en) * 2017-10-13 2022-10-11 Flexit Sverige Ab Rotating heat exchanger with improved heat transfer efficiency

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1059161A (en) * 1951-06-25 1954-03-23 Philips Nv Filling for heat recovery
FR1324372A (en) * 1962-03-07 1963-04-19 Air Liquide lining element for regenerators
US3200877A (en) * 1957-12-12 1965-08-17 Linde Eismasch Ag Packing units for heat exchangers operating at extremely low temperatures
US3216484A (en) * 1960-09-09 1965-11-09 Ibm Cryogenic regenerator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1059161A (en) * 1951-06-25 1954-03-23 Philips Nv Filling for heat recovery
US3200877A (en) * 1957-12-12 1965-08-17 Linde Eismasch Ag Packing units for heat exchangers operating at extremely low temperatures
US3216484A (en) * 1960-09-09 1965-11-09 Ibm Cryogenic regenerator
FR1324372A (en) * 1962-03-07 1963-04-19 Air Liquide lining element for regenerators

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3789494A (en) * 1972-04-24 1974-02-05 Aga Ab Method of spirally winding strip to produce pinned units
EP0339298A1 (en) * 1988-04-14 1989-11-02 Leybold Aktiengesellschaft Method of making a regenerator for a cryogenic refrigeration machine, and regenerator made according to this method
US4866943A (en) * 1988-10-17 1989-09-19 Cdc Partners Cyrogenic regenerator
US5012650A (en) * 1989-10-11 1991-05-07 Apd Cryogenics, Inc. Cryogen thermal storage matrix
EP0576202A1 (en) * 1992-06-24 1993-12-29 Gec-Marconi Limited Refrigerator
WO1995002161A3 (en) * 1993-07-09 1995-03-09 Ry Ms 2 Joint Venture Foil generator
WO1995002161A2 (en) * 1993-07-09 1995-01-19 Sierra Regenerators, Inc. Foil generator
US5429177A (en) * 1993-07-09 1995-07-04 Sierra Regenators, Inc. Foil regenerator
US6347453B1 (en) * 1998-05-22 2002-02-19 Matthew P. Mitchell Assembly method for concentric foil regenerators
US20030010473A1 (en) * 2001-07-10 2003-01-16 Mitchell Matthew P. Foil structure for regenerators
US6854509B2 (en) * 2001-07-10 2005-02-15 Matthew P. Mitchell Foil structures for regenerators
US11466938B2 (en) * 2017-10-13 2022-10-11 Flexit Sverige Ab Rotating heat exchanger with improved heat transfer efficiency
WO2020191479A1 (en) * 2019-03-28 2020-10-01 Etalim Inc. Thermal regenerator apparatus

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NL6409596A (en) 1966-02-21
GB1114695A (en) 1968-05-22
BE668614A (en)
CH436358A (en) 1967-05-31

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