US3192999A - Telescopic rotor construction for a rotary regenerator - Google Patents

Telescopic rotor construction for a rotary regenerator Download PDF

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Publication number
US3192999A
US3192999A US268625A US26862563A US3192999A US 3192999 A US3192999 A US 3192999A US 268625 A US268625 A US 268625A US 26862563 A US26862563 A US 26862563A US 3192999 A US3192999 A US 3192999A
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Prior art keywords
rotor
post
telescopic
support
absorbent material
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US268625A
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Stockman Richard
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Combustion Engineering Inc
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Combustion Engineering Inc
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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
    • F28D19/00—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium
    • F28D19/04—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier
    • F28D19/048—Bearings; Driving means
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/009—Heat exchange having a solid heat storage mass for absorbing heat from one fluid and releasing it to another, i.e. regenerator
    • Y10S165/013—Movable heat storage mass with enclosure
    • Y10S165/016—Rotary storage mass
    • Y10S165/026—Seal attached to and rotating with storage mass

Definitions

  • the present invention relates to rotary regenerative heat exchange apparatus and particularly to an improved arrangement for minimizing the thermo-elastic deformation of the structural parts of such apparatus as they are subjected to a wide range of temperature.
  • Rotary regenerative heat exchange apparatus of the conventional type includes a rotor carrying heat absorbent material in the form of metallic plates that arefirst positioned in a hot gas stream to absorb heat therefrom and then moved into a cool air stream to transfer the absorbed heat thereto.
  • the rotor is surrounded by a housing having end plates formed with openings that direct the flow of air and gas through the rotor, and to preclude the flow of air or gas through the clearance space between the rotor and the housing, the end edgesof the rotor are customarily provided with sealing means that conform to variations in the clearance space.
  • the clearance spaces are required to permit freedom of movement so the rotor may be rotated about its axis.
  • the rotor is continuously subjected to extreme thermal deformation that modifies the presumed clearance space and alters the preferred sealing relationship.
  • the deformation of the rotor normally includes an action termed dishing which is .due to the essentially linear temperature gradient that is imposed on the rotor between its axially spaced ends.
  • dishing which is .due to the essentially linear temperature gradient that is imposed on the rotor between its axially spaced ends.
  • the rotor assumes the shape of a frustum of a cone with the end facing the inlet for the hot gas being larger in diameter and convex while the opposite end is smaller and concave. Since one end of the rotor is customarily mounted on a support bearing while the other is mounted on a guide bearing, the rotor tends to move away from the support bearing and toward the guide hearing so as to increase the leakage problem at one end and materially decrease it at the otherend of the rotor.
  • the present invention provides a rotor arrangement that substantially eliminates deformation due to thermal variation, and it moveover contemplates utilizing a degree of normal rotor expansion to provide an improved sealing relationship between the rotary and fixed parts of the apparatus.
  • FIGURE 1 is a sectional elevation of a rotary regenerative heat exchanger constructed according to the invention.
  • FIGURE 2 is an enlarged view showing the details of FIGURE 1, and
  • FIGURE 3 is a view of the apparatus as seen from line 3-3 of FIGURE 2.
  • FIGURE 1 a cross section of the heat exchanger having cylindrical rotor including an inner rotor shell 10 and an outer rotor shell 12 joined together by radial partitions 14 to provide a series of sector shaped compartments for the heat absorbent material 16.
  • the rotor is mounted on a central rotor post having ,trunnions 28 at opposite ends thereof, each of which is fixedly supported by a support bearing 32 that is mounted on independent support structure.
  • a housing 34 enclosing the rotor is provided with end plates 36 that are apertured to permit the flow of air and gas therethrough.
  • the rotor is divided axially into independent upper and lower parts which when disposed in alignment together comprise a composite rotor having overall dimensions that satisfy the design conditions of the heat exchanger. 7
  • Each rotor, part thereof is supported by a supportbearing 32 at the end of the rotor remote therefrom in order that thermal expansion of the rotor and its supporting structure will move each part axially into a closer sealing relationship with its adjacent end plate.
  • the inner and outer rotor shells 10'and 12 together with radial partitions 14 would usually be divided axially so as to provide two rotor bodies of similar dimensions, although the relative height of each axial section may be varied somewhat in accordance with variable design criteria to provide an optimum relationship.
  • the rotor post is comprised of an independent outer section 27 carried by the support bearing 32 at the upper end of the rotor and an inner section 29 carried by the support
  • the outer. section 27 of the rotor post is slotted at a plurality of locations 30 to permit support structure 33 carried by inner telescopicrotor section 29 to extend therethrough in order that it may be secured to the upper section of the inner rotor shell 10.
  • the outer telescopic section 27 is secured directly to the lower section of the inner rotor shell 10 by the lateral supports 34.
  • the lower section of the rotor is carried by the support bearing 32 positioned at the upper end of the rotor, while the upper section of the rotor is carried by the support hearing at the lower end of the rotor.
  • each portion of the rotor expands away from its support bearing and tends to close the clearance space between the rotor and its adjacent end plate. Any differential in the expansion between upper and lower portions of the rotor may open a clearance space 38 which is readily covered by a sealing means 42 secured to the upper rotor structure.
  • the sealing means 42 Since the space 38 varies only slightly in extent due to a differential in thermal expansion between axially aligned parts of the rotor, the sealing means 42 must compensate for a minimum axial movement between adjacent parts of the rotor and leakage may be held to a minimum.
  • Rotary regenerative heat exchange apparatus having a rotor carrying a mass of heat absorbent material alter-.
  • a heating fluid and a fluid to be heated comprising a rotor shell, a central rotor post having a plurality of telescopic parts, support trunnions at opposite ends of the rotor post secured to independent parts of the telescopic rotor post, partition members extending radially from the rotor post to the rotor shell to form a series of sectoral compartments for the heat absorbent material, means for rotating the rotor about its axis, and support bearings fixedly mounted at each end of the rotor to rotatably support the spaced trunnions with a fixed spacing thereoetween.
  • Rotary regenerative heat exchange apparatus having a rotor carrying a mass of heat absorbent material, means for rotating the rotor alternately between a heating fluid and a fluid to be heated, said apparatus comprising a central rotor post having a plurality of telescopic sections, a rotor shell including a pair of axially adjacent independent sections concentric with the central rotor post, radial partitions extending from the rotor post to the rotor shell to form a series of sector-shaped compartments for the heat absorbent material, said radial partitions each comprising a pair of axially aligned plate members connected at their outboard ends to axially adjacent sections of the rotor shell While the inboard ends thereof are connected to the telescopic sections of the rotor post.
  • Rotary regenerative heat exchange apparatus as defined in claim 2 wherein inboard ends of said axially aligned plate members are connected to independent sections of the telescopic rotor post.
  • Rotary regenerative heat exchange apparatus as defined in claim 3, wherein axially aligned plate members which comprise the radial partitions are each connected to a section of the telescopic rotor post carried by a support bearing mounted at the distal end of the rotor.
  • Rotary regenerative heat exchange apparatus having a rotor carrying a mass of heat absorbent material alternately between a heating fluid and a fluid to be heated, said apparatus comprising a central rotor post with a plurality of telescopic sections, inner and outer rotor shells separated axially into upper and lower sections concentric with the central rotor post, partition means separated axially into upper and lower sections extending between corresponding sections of the rotor shell to provide a series of sectoral compartments for the heat absorbent material, support trunnions at opposite ends of the rotor secured to independent telescopic sections of the rotor post, support bearings fixedly mounted at each end of the rotor to rotatably support the trunnions with a fixed spacing therebetween, means rotating the rotor about its axis, and means connecting each section of the inner rotor shell to a section of the telescopic rotor post which is carried by the support trunnion at the distal end of the rotor.
  • Rotary regenerative heat exchange apparatus having a rotor carrying a mass of heat absorbent material alternately between a heating fluid and a fluid to be heated, said apparatus comprising a central rotor post with a plurality of telescopic sections, inner and outer rotor shells divided axially into upper and lower sections concentric with the central rotor post, partition means divided axially into upper and lower sections that extend radially between corresponding sections of the rotor post and rotor shells arranged to provide a series of sectoral compartments for the heat absorbent material, sealing means disposed between upper and lower sections of the rotor adapted to preclude fluid flow therebetween, support trunnions at opposite ends of the rotor secured to independent sections of the telescopic rotor post, support bearings fixedly mounted at each end of the rotor to rotatably support the trunnions with a fixed spacing therebetween, means for rotating the rotor about its axis and means connecting axially independent sections of the rotor to the section of

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Description

y 1965 R. STOCKMAN 3,192,999
TELESCOPIC ROTOR CONSTRUCTION FOR A ROTARY REGENERATOR Filed March 28, 1965 H A a f0- \{6 INVENTOR.
@ara foe/627a United States Patent 3,192,999 TELESCOPIC ROTOR CONSTRUCTION FOR A ROTARY REGENERATOR Richard Stockman, Friendship, N.Y., assignor to Combustion Engineering, Inc., New York, N.Y.', a corporation of Delaware Filed Mar. 28, 1963, Ser. No. 268,625
6 Claims. (Cl. 16'5--9) The present invention relates to rotary regenerative heat exchange apparatus and particularly to an improved arrangement for minimizing the thermo-elastic deformation of the structural parts of such apparatus as they are subjected to a wide range of temperature.
Rotary regenerative heat exchange apparatus of the conventional type includes a rotor carrying heat absorbent material in the form of metallic plates that arefirst positioned in a hot gas stream to absorb heat therefrom and then moved into a cool air stream to transfer the absorbed heat thereto. The rotor is surrounded by a housing having end plates formed with openings that direct the flow of air and gas through the rotor, and to preclude the flow of air or gas through the clearance space between the rotor and the housing, the end edgesof the rotor are customarily provided with sealing means that conform to variations in the clearance space. The clearance spaces are required to permit freedom of movement so the rotor may be rotated about its axis. However, because of the extreme temperature differential that may exist between axially remote ends or diametrically opposite sides of the rotor, the rotor is continuously subjected to extreme thermal deformation that modifies the presumed clearance space and alters the preferred sealing relationship.
The deformation of the rotor normally includes an action termed dishing which is .due to the essentially linear temperature gradient that is imposed on the rotor between its axially spaced ends. In this form of deformation the rotor assumes the shape of a frustum of a cone with the end facing the inlet for the hot gas being larger in diameter and convex while the opposite end is smaller and concave. Since one end of the rotor is customarily mounted on a support bearing while the other is mounted on a guide bearing, the rotor tends to move away from the support bearing and toward the guide hearing so as to increase the leakage problem at one end and materially decrease it at the otherend of the rotor.
Instead of attempting to provide a sealing means which would effectively compensate for such a clearance variation, the present invention provides a rotor arrangement that substantially eliminates deformation due to thermal variation, and it moveover contemplates utilizing a degree of normal rotor expansion to provide an improved sealing relationship between the rotary and fixed parts of the apparatus.
Other features and advantages of the present invention and the manner in which it may be carried into practice will become more apparent upon consideration of the following description and drawing thereof which involves the principles of the invention. Reference is accordingly made to the following drawings in which:
FIGURE 1 is a sectional elevation of a rotary regenerative heat exchanger constructed according to the invention.
FIGURE 2 is an enlarged view showing the details of FIGURE 1, and
FIGURE 3 is a view of the apparatus as seen from line 3-3 of FIGURE 2.
Referring more particularly to the drawings, there is illustrated in FIGURE 1 a cross section of the heat exchanger having cylindrical rotor including an inner rotor shell 10 and an outer rotor shell 12 joined together by radial partitions 14 to provide a series of sector shaped compartments for the heat absorbent material 16. The
bearing 32 at the lower end of the rotor.
3,192,999 Patented July 6,1965
ice
an outlet duct 24 where it is directed to any suitable point 7 of usage.
The rotor is mounted on a central rotor post having ,trunnions 28 at opposite ends thereof, each of which is fixedly supported by a support bearing 32 that is mounted on independent support structure.
A housing 34 enclosing the rotor is provided with end plates 36 that are apertured to permit the flow of air and gas therethrough.
In accordance with the invention the rotor is divided axially into independent upper and lower parts which when disposed in alignment together comprise a composite rotor having overall dimensions that satisfy the design conditions of the heat exchanger. 7 Each rotor, part thereof is supported by a supportbearing 32 at the end of the rotor remote therefrom in order that thermal expansion of the rotor and its supporting structure will move each part axially into a closer sealing relationship with its adjacent end plate. g
The inner and outer rotor shells 10'and 12 together with radial partitions 14 would usually be divided axially so as to provide two rotor bodies of similar dimensions, although the relative height of each axial section may be varied somewhat in accordance with variable design criteria to provide an optimum relationship.
The rotor post is comprised of an independent outer section 27 carried by the support bearing 32 at the upper end of the rotor and an inner section 29 carried by the support The outer. section 27 of the rotor post is slotted at a plurality of locations 30 to permit support structure 33 carried by inner telescopicrotor section 29 to extend therethrough in order that it may be secured to the upper section of the inner rotor shell 10. The outer telescopic section 27 is secured directly to the lower section of the inner rotor shell 10 by the lateral supports 34.
In accordance with this arrangement the lower section of the rotor is carried by the support bearing 32 positioned at the upper end of the rotor, while the upper section of the rotor is carried by the support hearing at the lower end of the rotor. When the rotor is subjected to normal operating conditions and its temperature is increased accordingly, each portion of the rotor expands away from its support bearing and tends to close the clearance space between the rotor and its adjacent end plate. Any differential in the expansion between upper and lower portions of the rotor may open a clearance space 38 which is readily covered by a sealing means 42 secured to the upper rotor structure. Since the space 38 varies only slightly in extent due to a differential in thermal expansion between axially aligned parts of the rotor, the sealing means 42 must compensate for a minimum axial movement between adjacent parts of the rotor and leakage may be held to a minimum.
Although this invention has been described with reference to the embodiment illustrated in the drawing, it is evident that various changes may be made without departing from the spirit of the invention and it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
I claim:
1. Rotary regenerative heat exchange apparatus having a rotor carrying a mass of heat absorbent material alter-.
nately between a heating fluid and a fluid to be heated comprising a rotor shell, a central rotor post having a plurality of telescopic parts, support trunnions at opposite ends of the rotor post secured to independent parts of the telescopic rotor post, partition members extending radially from the rotor post to the rotor shell to form a series of sectoral compartments for the heat absorbent material, means for rotating the rotor about its axis, and support bearings fixedly mounted at each end of the rotor to rotatably support the spaced trunnions with a fixed spacing thereoetween.
2. Rotary regenerative heat exchange apparatus having a rotor carrying a mass of heat absorbent material, means for rotating the rotor alternately between a heating fluid and a fluid to be heated, said apparatus comprising a central rotor post having a plurality of telescopic sections, a rotor shell including a pair of axially adjacent independent sections concentric with the central rotor post, radial partitions extending from the rotor post to the rotor shell to form a series of sector-shaped compartments for the heat absorbent material, said radial partitions each comprising a pair of axially aligned plate members connected at their outboard ends to axially adjacent sections of the rotor shell While the inboard ends thereof are connected to the telescopic sections of the rotor post.
3. Rotary regenerative heat exchange apparatus as defined in claim 2 wherein inboard ends of said axially aligned plate members are connected to independent sections of the telescopic rotor post.
4. Rotary regenerative heat exchange apparatus as defined in claim 3, wherein axially aligned plate members which comprise the radial partitions are each connected to a section of the telescopic rotor post carried by a support bearing mounted at the distal end of the rotor.
5. Rotary regenerative heat exchange apparatus having a rotor carrying a mass of heat absorbent material alternately between a heating fluid and a fluid to be heated, said apparatus comprising a central rotor post with a plurality of telescopic sections, inner and outer rotor shells separated axially into upper and lower sections concentric with the central rotor post, partition means separated axially into upper and lower sections extending between corresponding sections of the rotor shell to provide a series of sectoral compartments for the heat absorbent material, support trunnions at opposite ends of the rotor secured to independent telescopic sections of the rotor post, support bearings fixedly mounted at each end of the rotor to rotatably support the trunnions with a fixed spacing therebetween, means rotating the rotor about its axis, and means connecting each section of the inner rotor shell to a section of the telescopic rotor post which is carried by the support trunnion at the distal end of the rotor.
6. Rotary regenerative heat exchange apparatus having a rotor carrying a mass of heat absorbent material alternately between a heating fluid and a fluid to be heated, said apparatus comprising a central rotor post with a plurality of telescopic sections, inner and outer rotor shells divided axially into upper and lower sections concentric with the central rotor post, partition means divided axially into upper and lower sections that extend radially between corresponding sections of the rotor post and rotor shells arranged to provide a series of sectoral compartments for the heat absorbent material, sealing means disposed between upper and lower sections of the rotor adapted to preclude fluid flow therebetween, support trunnions at opposite ends of the rotor secured to independent sections of the telescopic rotor post, support bearings fixedly mounted at each end of the rotor to rotatably support the trunnions with a fixed spacing therebetween, means for rotating the rotor about its axis and means connecting axially independent sections of the rotor to the section of the telescopic rotor post which is carried by the support trunnion at the distal end of the rotor.
References Qited by the Examiner UNITED STATES PATENTS 2,936,160 5/60 Nilsson et al --8 3,024,005 3/62 Dore et al 1659 3,088,519 5/63 Lyle 165--10 CHARLES- SUKALO, Primary Examiner.
MEYER PERLIN, Examiner.

Claims (1)

1. ROTARY REGENERATIVE HEAT EXCHANGE APPARATUS HAVING A ROTOR CARRYING A MASS OF HEAT ABSORBENT MATERIAL ALTERNATELY BETWEEN A HEATING FLUID AND A FLUID TO BE HEATED COMPRISING A ROTOR SHELL, A CENTRAL ROTOR POST HAVING A PLURALITY OF TELESCOPIC PARTS, SUPPORT TRUNNIONS AT OPPOSITE ENDS OF THE ROTOR POST SECURED TO INDEPENDENT PARTS OF THE TELESCOPIC ROTOR POST, PARTITION MEMBERS EXTENDING RADIALLY FROM THE ROTOR POST TO THE ROTOR SHEEL TO FORM A SERIES OF SECTOR COMPARTMENTS FOR THE HEAT ABSORBENT MATERIAL, MEANS FOR ROTATING THE ROTOR ABOUT ITS AXIS, AND SUPPORT BEARINGS FIXEDLY MOUNTED AT EACH END OF THE ROTOR TO ROTATABLY SUPPORT THE SPACED TRUNNIONS WITH A FIXED SPACING THEREBETWEEN.
US268625A 1963-03-28 1963-03-28 Telescopic rotor construction for a rotary regenerator Expired - Lifetime US3192999A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939902A (en) * 1975-02-05 1976-02-24 Coors Porcelain Company Heat exchanger rim and hub with L-shaped cross-section
US4000775A (en) * 1975-04-24 1977-01-04 The Babcock & Wilcox Company Heat exchanger structure
FR2337866A1 (en) * 1976-01-08 1977-08-05 Svenska Rotor Maskiner Ab SEAL FOR A HEAT EXCHANGER
JPS52135555U (en) * 1976-04-03 1977-10-14
US4372370A (en) * 1981-08-19 1983-02-08 The Air Preheater Company, Inc. Rotor support

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2936160A (en) * 1952-12-22 1960-05-10 Svenska Rotor Maskiner Ab Regenerative heat exchanger, specifically air preheater
US3024005A (en) * 1959-04-23 1962-03-06 Air Preheater Rotor adjusting arrangement
US3088519A (en) * 1958-09-09 1963-05-07 Air Preheater Rotor construction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2936160A (en) * 1952-12-22 1960-05-10 Svenska Rotor Maskiner Ab Regenerative heat exchanger, specifically air preheater
US3088519A (en) * 1958-09-09 1963-05-07 Air Preheater Rotor construction
US3024005A (en) * 1959-04-23 1962-03-06 Air Preheater Rotor adjusting arrangement

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939902A (en) * 1975-02-05 1976-02-24 Coors Porcelain Company Heat exchanger rim and hub with L-shaped cross-section
US4000775A (en) * 1975-04-24 1977-01-04 The Babcock & Wilcox Company Heat exchanger structure
FR2337866A1 (en) * 1976-01-08 1977-08-05 Svenska Rotor Maskiner Ab SEAL FOR A HEAT EXCHANGER
JPS52135555U (en) * 1976-04-03 1977-10-14
US4372370A (en) * 1981-08-19 1983-02-08 The Air Preheater Company, Inc. Rotor support
FR2511764A1 (en) * 1981-08-19 1983-02-25 Air Preheater ROTARY HEAT EXCHANGER WITH RECOVERY

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