EP2375211A2 - Moyeu pour un échangeur de chaleur rotatif - Google Patents

Moyeu pour un échangeur de chaleur rotatif Download PDF

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Publication number
EP2375211A2
EP2375211A2 EP11161301A EP11161301A EP2375211A2 EP 2375211 A2 EP2375211 A2 EP 2375211A2 EP 11161301 A EP11161301 A EP 11161301A EP 11161301 A EP11161301 A EP 11161301A EP 2375211 A2 EP2375211 A2 EP 2375211A2
Authority
EP
European Patent Office
Prior art keywords
hub
cylindrical member
end portion
hub according
cylindrical
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.)
Withdrawn
Application number
EP11161301A
Other languages
German (de)
English (en)
Inventor
Mikael Swantesson
Stina Delin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JIJ-plast
JIJ Plast AB
Heatex AB
Original Assignee
JIJ-plast
JIJ Plast AB
Heatex AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by JIJ-plast, JIJ Plast AB, Heatex AB filed Critical JIJ-plast
Publication of EP2375211A2 publication Critical patent/EP2375211A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F28D19/041—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 with axial flow through the intermediate heat-transfer medium
    • F28D19/042—Rotors; Assemblies of heat absorbing masses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F24F3/1411—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by absorbing or adsorbing water, e.g. using an hygroscopic desiccant
    • F24F3/1423—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by absorbing or adsorbing water, e.g. using an hygroscopic desiccant with a moving bed of solid desiccants, e.g. a rotary wheel supporting solid desiccants
    • 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
    • F28D19/041—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 with axial flow through the intermediate heat-transfer medium
    • F28D19/042—Rotors; Assemblies of heat absorbing masses
    • F28D19/044—Rotors; Assemblies of heat absorbing masses shaped in sector form, e.g. with baskets
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material

Definitions

  • the present invention relates to a hub. More particularly, the present invention relates to a hub arranged to transmit rotational movement to a thermal wheel of a rotary heat exchanger.
  • Hubs are commonly used for allowing a wheel to rotate relative a fixed support.
  • bearings may be assembled to form a hub for allowing the wheel to rotate at low friction relative the stationary support.
  • hubs are inserted at the rotational axis of the rotating thermal wheel to allow them to rotate during use.
  • hubs may have metal ball bearings or slide bearings for enabling such rotation.
  • Rotary heat exchangers of this type are readily available from a number of manufacturers.
  • the diameters of commercially available rotary heat exchangers are typically between 500 and 2500 mm. As the size of the thermal wheel increases the demands on the hub does too..
  • hubs of known types for forming hubs of a rotary heat exchanger
  • Hubs having metal ball bearings and/or slide bearings are often very complex constructions, having small tolerances and being made to a particular size of the thermal wheel to fit properly. Moreover such hubs are heavy, leading to increased energy consumption during operation. Also, ball bearings of small diameters are more prone to decreased bearing capacity during prolonged use, due to the proportional negative effect of adhering dust, dirt etc.
  • a hub for a thermal wheel of a rotary heat exchanger having a cylindrical and longitudinal body, having a centrally aligned and longitudinally extending lumen or through hole for receiving a support axis, said support axis suspending the thermal wheel of the rotary heat exchanger, wherein at least the surface of the cylindrical and longitudinal body facing the support axis is of a polymeric material.
  • the hub may be entirely made of a polymeric material, which is advantageous in that the hub may be manufactured using simple processes, and in that the material costs are reduced.
  • the polymeric material may be a thermoplastic material, and the thermoplastic material may be POM.
  • the hub may be manufactured by means of injection molding which is a well known and cost effective process.
  • the cylindrical and longitudinal body may comprise a cylindrical member extending along a rotational axis of said thermal wheel, said cylindrical member having a first end comprising said lumen or through hole and means for connecting said cylindrical member to a driving system, and an end portion comprising a lumen or through hole for receiving said support axis, said end portion being insertable into said cylindrical member at a second end being opposite the first end.
  • the cylindrical member may comprise a topographical pattern at its interior surface, such that the end portion is prevented from being inserted beyond said pattern. This ensures that mounting may be performed by the end user, since unintended mounting is prevented by the pattern.
  • the thickness of the end portion may be either equal or twice the distance between the pattern and the second end. Hence, the end portion may be used to close the open end or to form an intermediate member for connecting two cylindrical bodies.
  • the first end of the cylindrical member may comprise a centrally aligned lumen or through hole, and at least one recess arranged off-center. This facilitates mounting of the thermal wheel onto the hub.
  • the end portion may comprise a central portion extending from a first side to a second side, at least one sector extending radially from said first side of said central portion, and at least one sector extending radially from said second side of said central portion, wherein the central portion and the sectors are forming a circular end piece.
  • the end portion may further comprise three sectors extending radially from said first side of said central portion and three sectors extending radially from said second side of said central portion, wherein each sector extending radially from said first side is arranged angularly adjacent to two sectors extending radially from said second side.
  • each sector extending radially from said first side may be connected to a sector extending radially from said second side by means of a member extending from the first side to the second side.
  • the end portion may carry two longitudinal bodies such that the force on the end portion is distributed uniformly on the first and second sides, leading to a rigid and resistant construction.
  • the hub may further comprise a second cylindrical member extending along a rotational axis of said thermal wheel, said cylindrical member having a first end comprising said lumen or through hole, wherein said end portion is simultaneously insertable into the cylindrical member and the second cylindrical member thus forming a connection between the cylindrical members.
  • a thermal wheel 10 of a rotary heat exchanger is shown.
  • the thermal wheel 10 is formed by a central hub 100 and a matrix 200 that is connected to the hub 100.
  • the hub 100 is a longitudinal and tubular body, having a central lumen for receiving a support axis (not shown).
  • the support axis suspends the thermal wheel 10 in an operating position wherein the thermal wheel 10 is allowed to rotate relative the support axis.
  • the hub 100 has an outer surface facing the matrix 200, and the thermal wheel 10 is preferably mounted in a casing (not shown) to form a rotary heat exchanger. Additional components are thus required, including a drive system, sealings, and the provision of a fluid flow.
  • rotary heat exchangers are well known, the physical principles of operation will not be described in detail.
  • the drive system typically comprises an electrical motor designed to rotate at 0,5 to 20 rounds per minute.
  • the rotational shaft of the electrical motor is connected to a pulley that drives an endless belt.
  • the endless belt is further connected to the thermal wheel 10, either at its periphery or by means of a bearing connected to the hub 100.
  • a control system may also be provided for regulating the rotational speed of the thermal wheel 10. This is advantageous in applications where the rotational speed needs monitoring for optimizing the efficiency of the heat exchanger.
  • the hub 100 has an inner surface, i.e. the surface that during operation is facing the support axis, of a polymeric material.
  • the present inventors have surprisingly found that a hub of a polymeric material still satisfies the bearing demands for small rotational heat exchangers. Thus, ball bearings may be omitted in such small rotational heat exchangers.
  • the hub 100 is entirely made of a polymeric material. In this way the hub 100 in its entirety or hub parts assembled into the hub 100 may be molded, such as injection molded, resulting in an easy and cost-effective manufacturing process.
  • the hub 100 from a core in another material than polymeric material, whereafter the core is coated with a polymeric material.
  • the polymeric material may suitably be a plastic material.
  • the plastic material is a thermoplastic material.
  • the polymeric material is a thermoplastic material, the material may be reused, once the hub 100 has been worn sufficiently long.
  • thermoplastic materials facilitate the manufacturing process and the quality of the hub, because of the shapability making injection molding possible, which in turn allows for improved surface control and thus decreased risk of uneven running.
  • thermoplastic material is an acetal based plastic, such as POM (polyoxymethylene)
  • POM polyoxymethylene
  • the hub 100 comprises a longitudinal and cylindrical member 110 having an outer diameter corresponding to the inner diameter of the thermal wheel 10. Hence, the cylindrical member 110 may be inserted and fitted into the thermal wheel 10.
  • the cylindrical member 110 has a first end 112, and an open second end 114.
  • the first end 112 has a centrally aligned and longitudinal extending lumen or through hole 116 and at least one recess 118 being aligned off center.
  • the cylindrical member 110 further comprises a longitudinal slit 119 extending longitudinally from one end to the other on the outside of the cylindrical member 110.
  • the recess 118 and the slit 119 are provided to facilitate mounting and monitoring of the rotational matrix, as will be further described later on.
  • the hub 100 further comprises a circular end portion 120a being insertable into the open end 114 of the cylindrical member 110.
  • the end portion 120a has a centrally aligned lumen or through hole 122 that is aligned with the through hole of the first end when the end portion 120a is inserted in the cylindrical member 110.
  • the hub When the assembled hub is positioned inside the thermal wheel, the hub will allow a rotational movement to be transmitted from the hub to the thermal wheel, or vice versa.
  • the hub is thus connected to a central axis, extending through the hub via the centrally aligned through holes 116, 122.
  • the thermal wheel is thus allowed to rotate relative the support axis by means of the drive system.
  • the drive system may either be connected to the outer periphery of the thermal wheel or to the hub by means of the belt..
  • the end portion 120a has a central portion 124 that encloses the through hole 122, which central portion 124 extends from a first side 126 to a second side 128.
  • Sectors 130, 132 are arranged between the central portion 124 and the periphery of the end portion 120.
  • Three sectors 130a, b, and c are arranged at the first side 126 of the end portion 120, extending radially perpendicular to the axis of the through hole 122.
  • three sectors 132a, b, and c are arranged at the second side 128 of the end portion 120, extending radially perpendicular to the axis of the through hole 122.
  • Each sector 130a-c, 132a-c is 60° wide.
  • Each sector 130a-c being arranged at the first side 126 is arranged adjacent to two sectors 132a-c being arranged at the second side 128, and being connected to these sectors by means of a connecting member 134 extending perpendicular to the axis of the through hole 122 and perpendicular to the sectors 130, 132.
  • the relative dimensions of the end portion 120a may be varied.
  • the radius of the central portion 124 may be made larger and the radius of each sector 130, 132 may be made smaller, correspondingly. This may be advantageous in that the body mass of the end portion 120a is made larger, thus increasing the capability of carrying load.
  • the central portion 124 may be made smaller such that it merely encloses the through hole 122. This may be advantageous in cases where the load to carry is small, in which case the weight and material costs may be reduced.
  • the number of sectors 130, 132 is varied from two and upwards.
  • the number of sectors 130 extending from the first side 126 equals the number of sectors extending from the second side 128.
  • the angular width of the sectors is substantially the same.
  • the periphery of the end portion 120a is adapted to fit the interior surface of the open end 114 of the cylindrical member 110.
  • the inner diameter of the cylindrical member 110 is slightly enlarged at the open end 114 by means of a circumferential edge 115.
  • the interior surface of the open end 114 further comprises a topographical pattern 140 being arranged at the enlarged inner diameter.
  • the pattern 140 has a number of circumferential protrusions 142 being equal to the total number of sectors 130, 132, each protrusion having the same angular width as the sectors 130, 132.
  • the protrusions 142 are spaced apart by a distance being equal to the thickness of the connecting member 134.
  • the width of each protrusion is further designed to be equal, or slightly less, than the axial distance between the interior surfaces of two opposite sectors 130, 132.
  • the end portion 120a is designed to fit with the interior surface of the cylindrical member 110 such that the end portion 120a is prevented from moving both axially and radially.
  • the thickness of the end portion 120b is twice as large as the end portion 120a shown in Fig. 3 , i.e. twice as large as the distance between the open end 114 of the cylindrical member 110 and the edge where the inner diameter of the cylindrical member 110 is changed.
  • half of the end portion 120b will extend outside the cylindrical member 110 and this part may thus be inserted into a second cylindrical member 110. This is shown in Fig. 5 .
  • the intermediate portion 120b is designed to fit with the interior surface of the cylindrical members 110 such that the intermediate portion 120b is prevented from moving both axially and radially. Consequently, the cylindrical members 110 are secured and are not allowed to move relative each other.
  • hubs of different length may be easily assembled. Consequently, a number of different thermal wheel thicknesses may be fitted easily be combining standard hub parts.
  • a hub producer is manufacturing cylindrical members 110 having a length of 100 and 150 mm, respectively. End portions 120a, b having a thickness of 10 and 20 mm, respectively are also manufactured. By assembling a cylindrical member and a 10 mm end portion, or by assembling two cylindrical members via a 20 mm end portion hubs of 100, 150, 200, 250 or 300 mm length may be assembled.
  • sheets of foil material are provided.
  • Such material may for example be a first planar sheet and a second corrugated sheet, arranged on top of the planar sheet.
  • the material of the sheets may be any material being suitable for thermal wheels, such as pure aluminum, aluminum coated with epoxy for use in corrosive environments, or aluminum being treated chemically for providing a hygroscopic or an adsorptive material.
  • the sheets of material are cut to have a width corresponding to the final thickness of the thermal wheel.
  • the material of the sheets may be paper or carton, fabric, or polymeric material.
  • a hub according to what has been described above is provided.
  • the hub is assembled either by a solitary cylindrical member and a corresponding end piece, or by connecting two cylindrical members by means of an intermediate end piece acting as a connecting member.
  • the hub is then mounted on a driving device that is connected to the off-center recesses of the closed end of the hub. Further, one free end of the sheets of material is fastened in the longitudinal slit of the cylindrical member.
  • the hub When the driving device is activated, the hub will rotate and the sheets of material will be rolled onto the hub.
  • the hub is rotated until the radius of the thermal wheel equals a predetermined value, or when the sheets of material are completely rolled onto the hub.
  • a casing may be provided for preventing the free end of the sheets of material to move away from the thermal wheel.
  • the casing may for example be provided as the outermost revolutions of sheet material being glued together, or as a tape or other polymeric material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Braking Arrangements (AREA)
  • Gears, Cams (AREA)
EP11161301A 2010-04-06 2011-04-06 Moyeu pour un échangeur de chaleur rotatif Withdrawn EP2375211A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1050327A SE534435C2 (sv) 2010-04-06 2010-04-06 Nav

Publications (1)

Publication Number Publication Date
EP2375211A2 true EP2375211A2 (fr) 2011-10-12

Family

ID=44246585

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11161301A Withdrawn EP2375211A2 (fr) 2010-04-06 2011-04-06 Moyeu pour un échangeur de chaleur rotatif

Country Status (2)

Country Link
EP (1) EP2375211A2 (fr)
SE (1) SE534435C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015189410A1 (fr) 2014-06-13 2015-12-17 Amarant Industri Ab Roue thermique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107560018A (zh) * 2017-09-28 2018-01-09 欧伏电气股份有限公司 复合型除湿/热回收转轮及除湿/热回收机

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015189410A1 (fr) 2014-06-13 2015-12-17 Amarant Industri Ab Roue thermique

Also Published As

Publication number Publication date
SE1050327A1 (sv) 2011-08-23
SE534435C2 (sv) 2011-08-23

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