Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
  • F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
• • 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
  • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
  • F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
  • F28D7/106—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically consisting of two coaxial conduits or modules of two coaxial conduits
• • 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
  • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
  • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
  • F28D2021/0042—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for foodstuffs

Definitions

• the present invention relates to a heat exchanger of the type which includes a plurality of heat exchanger elements carried by a frame and interconnected to one another in a flow system with a product flow and flow for a heat transfer medium, each heat exchanger element displaying, on the one hand, one or more heat transfer tubes interconnected by means of tube plates to form product flow inserts, and, on the other hand, a casing tube surrounding the heat transfer tubes, two adjacent product flow inserts being interconnected with one another by means of product pipe bends.
• Heat exchangers which exist in a multiplicity of types, are employed when the intention is to heat or cool a liquid product, for example with the aid of steam, water or other liquid at different temperatures. Heat exchangers come into use within various process industries and are also common occurrences in the food industries, such as dairies.
• a well-known type of heat exchanger is the so-called tube heat exchanger which consists of one or more heat exchanger elements which are interconnected with one another in a flow system, with a product flow and a flow for a heat transfer medium.
• a heat exchanger element substantially consists of one or more heat transfer tubes surrounded by an outer casing tube.
• the heat transfer tubes are interconnected by means of a tube plate to form a unit, a product flow insert.
• Two adjacent product flow inserts are in turn interconnected by means of product pipe bends to form a product flow in order to be able to circulate the product which is to be heated or cooled in the process.
• the outer casing tubes are also interconnected in order to be able to circulate a heat transfer medium, such as water or other liquid, or steam or alternatively other gases.
• One object of the present invention is to further simplify the modularised tube heat exchanger in order to create the possibility of competing with the plate heat exchanger which are common on the market and are considerably cheaper.
• a further object of the present invention is to realise a tube heat exchanger which, despite its compact construction, is capable of taking up the thermal expansions which always occur in heat exchangers.
• Yet a further object of the present invention is to realise a tube heat exchanger which is economical to manufacture and which is simple to install and maintain.
• Fig. 1 is a side elevation of a heat exchanger according to the present invention
• Fig. 2 is a side elevation of a part of a heat exchanger
• Fig. 3 is a side elevation, partly in section, of a product pipe bend
• Fig. 4 is a side elevation, partly in section, of a part of a heat exchanger element
• Fig. 5 is a plan view of a tube plate
• Fig. 6 is a plan view of a connection profile; and Figs. 7-9 show different end elevations of heat exchangers.
• the accompanying Drawings show only those parts and details essential to an understanding of the present invention.
• a tube heat exchanger according to the present invention consists substantially of one or more heat exchanger elements 1.
• the heat exchanger normally consists of a number of these heat exchanger elements 1, interconnected with one another in a flow system.
• a heat exchanger element 1 consists of an outer casing tube
• a number of heat transfer tubes 3 with a tube plate 4 at each end constitutes a product flow insert 5.
• the casing tube 2 is, in both ends, welded to each respective tube plate 4.
• Fig. 1 shows a number of heat exchanger elements 1 interconnected to form a heat exchanger.
• the heat exchanger has a flow for product, which is shown by means of white arrows, and a flow for a heat transfer medium, which is shown by black arrows.
• the heat transfer medium is to heat or cool the product, depending upon the process which is desired.
• the heat transfer medium may consist of water or other liquid of different temperature, or alternatively of steam or other gas.
• a heat exchanger according to the present invention may also be employed regeneratively, i.e. product is employed in both of the flows so that an already heated product heats the incoming cold product, and vice versa.
• the product flow is circulated in the heat transfer tubes 3 which constitute the major part of the product flow inserts 5.
• Two adjacent product flow inserts 5 are interconnected by means of a product pipe bend 6, in that the product pipe bend is secured with a flange union in two adjacent tube plates 4.
• the product pipe bend 6 is preferably of elliptical cross section centrally between two product flow inserts 5, in point 7, and of circular cross section in both its ends. Alternatively, the product pipe bend 6 may be of circular cross section throughout its entire length.
• An elliptical product pipe bend 6 in accordance with the foregoing is described in detail in Swedish Patent Application SE 9703865-7.
• the flow for the heat transfer medium is circulated through the casing tubes 2.
• the casing tubes 2 In the proximity of both of their ends, the casing tubes 2 have a circular aperture 8 in the casing surface with a collar 9.
• the collar 9 corresponds with a connection member 10.
• the connection member 10 which substantially consists of a straight tube length, is bevelled in both its ends and provided with a gasket or O-ring 11.
• the collars 9 abut against the O- rings 11 in both ends of the connection member 10 and constitute a tight and, to some degree, a flexible union.
• a tube plate 4 which constitutes a part of a product flow insert 5, is shown in Fig. 5.
• the plate 4 has modular adapted outer dimensions and, in its four corners, is provided with grooves 12.
• the grooves 12 correspond with a coupling profile 13 which is shown in Fig. 6.
• the coupling profile 13 is substantially cruciform.
• a coupling profile 13 may unite two, three or four tube plates 4. In that the tube plates 4 in a heat exchanger are placed closely adjacent one another united by coupling profiles 13, there will be obtained a stable unit which constitutes a part of the frame of the heat exchanger.
• Various ways of placing four heat exchanger elements 1 are shown in Figs. 7- 9.
• the heat exchanger elements 1 are placed on a lower frame section 14 with adjustable feet 15.
• the lower frame section 14 has grooves 16 corresponding to the grooves 12 in the tube plates 4.
• the tube plates 4 are locked against the lower frame section 14 by means of coupling profiles 13.
• each individual heat exchanger element 1 may move in its longitudinal direction. This is a necessity, since the heat exchanger elements are subjected to powerful thermal expansion.
• the connection members 10 may also move laterally to some degree and trials have shown that a tight union will be obtained despite oblique inclination against the O-rings 11. The corresponding oblique inclination would not be possible in, for example, a flange union.
• connection member 10 may be readily dismantled anywhere whatever in a complete heat exchanger, which affords a certain possibility for inspection. This is particularly important when the heat exchanger is employed regeneratively, i.e. when product is run against product.
• the connection member 10 is easy to maintain since it normally entails that only the O-rings 11 must be replaced.
• the connection member 10 is also relatively simple to manufacture given that the flexibility in the member 10 gives room for greater tolerances.
• connection member 10 may take up a part of the thermal expansion. If crack formation were nevertheless to occur, only one casing tube 2 need be replaced.
• the present invention realises a heat exchanger which is simple and economical to manufacture and which has great possibilities for taking up the thermal expansion which occurs in a heat exchanger.

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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)

Applications Claiming Priority (3)

Publications (1)

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ID=20413407

Family Applications (1)

Country Status (8)

Cited By (1)

Families Citing this family (17)

Citations (1)

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• 1998
  • 1998-11-25 SE SE9804037A patent/SE9804037L/ not_active Application Discontinuation
• 1999
  • 1999-11-24 CN CN 99815811 patent/CN1333868A/zh active Pending
  • 1999-11-24 BR BR9915657-1A patent/BR9915657A/pt not_active Application Discontinuation
  • 1999-11-24 AU AU19036/00A patent/AU1903600A/en not_active Abandoned
  • 1999-11-24 EA EA200100580A patent/EA002536B1/ru not_active IP Right Cessation
  • 1999-11-24 WO PCT/SE1999/002175 patent/WO2000031489A1/en not_active Application Discontinuation
  • 1999-11-24 CA CA002352192A patent/CA2352192A1/en not_active Abandoned
  • 1999-11-24 EP EP99962631A patent/EP1153257A1/en not_active Withdrawn

Patent Citations (1)

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