EP2423618A2 - Verbessertes Verfahren zur Isolierung eines Heißwasserzylinders - Google Patents

Verbessertes Verfahren zur Isolierung eines Heißwasserzylinders Download PDF

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Publication number
EP2423618A2
EP2423618A2 EP11250707A EP11250707A EP2423618A2 EP 2423618 A2 EP2423618 A2 EP 2423618A2 EP 11250707 A EP11250707 A EP 11250707A EP 11250707 A EP11250707 A EP 11250707A EP 2423618 A2 EP2423618 A2 EP 2423618A2
Authority
EP
European Patent Office
Prior art keywords
casing
container
base portion
wall
locating
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.)
Granted
Application number
EP11250707A
Other languages
English (en)
French (fr)
Other versions
EP2423618A3 (de
EP2423618B1 (de
Inventor
Mark Anthony Storey
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.)
BDR Thermea Group BV
Original Assignee
Baxi Heating UK Ltd
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 Baxi Heating UK Ltd filed Critical Baxi Heating UK Ltd
Publication of EP2423618A2 publication Critical patent/EP2423618A2/de
Publication of EP2423618A3 publication Critical patent/EP2423618A3/de
Application granted granted Critical
Publication of EP2423618B1 publication Critical patent/EP2423618B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/18—Water-storage heaters
    • F24H1/181—Construction of the tank
    • F24H1/182—Insulation

Definitions

  • the present invention relates to a method of providing an insulating layer around a domestic hot water cylinder.
  • the method is suitable for cylinders housed within an outer casing.
  • an insulated domestic hot water cylinder is also disclosed.
  • the installer of a domestic hot water cylinder is supplied with a cylinder already held within a housing: referred to collectively as a heater.
  • the housing apart from any aesthetic function, is furnished with means to allow the heating element of the heater, located within the cylinder to be controlled and to enable connection of the cylinder to the cold and the hot water inlets and outlets to take place.
  • the element's controls are mounted onto an outer surface of the heater, although said controls can be located remotely.
  • the present invention is concerned with the provision of a layer of insulating material between the hot-water cylinder and the housing.
  • the insulating layer is well known in the prior art and can be achieved by means of a variety of methods.
  • a layer of preformed insulator such as fibreglass
  • This method is however relatively time consuming and does not always give good contact between the cylinder and the insulator.
  • fitment around wires and pipes is not always easy.
  • the layer of material is quite heavy which adds to the difficulties in manipulating the heater into position.
  • a second method is to secure the cylinder in position within the housing and feed into the space there between a polymer precursor which, when set provides an insulating barrier in close continuous contact with the cylinder.
  • the polymer precursor includes a foaming agent which both assists the polymer to fill the volume required, but also provides air bubbles within the polymer material which reduce the density of the insulating layer.
  • the primary disadvantage is that care needs to be taken that the liquid prepolymer does not flow out of the heater before it has a chance to set. Even if only a small proportion leaks out and although the polymers are harmless the polymer can be unsightly and will need to be removed. The precautions usually undertaken to do this, render the method of construction of a heater time consuming in terms of overall time for the process and man hours required to properly manipulate the cylinder. In addition wiper blades usually need to be incorporated to wipe away prepolymer as it leaks out, although even this is not usually completely effective.
  • a method of manufacture of an insulated hot water container within a housing comprising the steps of:
  • the sealant material in the well helps to prevent the liquid prepolymer from running out onto the base portion at least sufficiently long for the polymer mixture to become more viscous as it polymerises.
  • the casing is formed of a harder material than that of the base portion or of the top moulding, to enable the casing to press into or cut into the base portion or top moulding and thereby form an additional seal.
  • pressure is applied in an axial direction to urge the top moulding, casing and base portion together to reduce the possibility of liquid prepolymer from leaking out.
  • the method comprises the further step of placing an insulating moulding between the container and the outer casing about a pipe or pipes leading from the container through an aperture in the outer casing and clamping the outer casing to the container such that the aperture is sealed.
  • the moulding assists in meeting manufacturing tolerances for the pipes.
  • the polymer material formed is a polyurethane which increases in volume during the polymerisation step.
  • the expansion of the polymeric material acts to force the casing against the outer rim wall to reduce the possibility of the prepolymer leaking out.
  • the top moulding includes an outer rim wall, the expanding polymer material acting to urge the casing against the outer rim wall.
  • a heater said heater including a hot water container resting upon a base portion, the base portion including an outer rim wall and an inner locating wall; a casing, formed of sheet material, said casing resting on a sealant material and being retained in position in the channel formed between said outer rim, wall and inner locating wall; the heater further comprising a top moulding, said top moulding being fixed onto the upper edge of the casing, the casing the base portion and the top moulding co-operating to enclose the container, and insulating material being provided between the container and the casing.
  • Hot water heaters in which a cylinder, wherein water is heated and stored, is housed within an outer casing or wrapper - typically formed of sheet steel - and having an insulating layer, such as foam, rockwool or other materials having low heat conductance between the cylinder and the casing are well known.
  • an outer casing or wrapper - typically formed of sheet steel - and having an insulating layer, such as foam, rockwool or other materials having low heat conductance between the cylinder and the casing are well known.
  • the usual prior art method of manufacture of such heaters is however relatively time-consuming and requires several operators to work together co-operatively.
  • a base section is located upside down onto an edge of the sheet material eventually to form the casing.
  • the sheet material is usually preformed into a tube and tapped into place to ensure that the casing does not fall out.
  • the casing and base section are then turned upside down so that the base section is at the base of the casing.
  • the cylinder is dropped into position, and the lid placed onto the free end of the casing. Again, an operator taps the lid into position.
  • the assembly thus made is then filled with insulating material in the form of a liquid prepolymer. Difficulties are encountered however in that the prepolymer can easily leak out between the casing and the base section.
  • the present invention addresses these problems in one embodiment, by improving the ease of formation and of the strength of the seal between the casing and the base section.
  • FIG. 1a, 1b illustrate the basic elements of the heater.
  • a heater generally referenced 10, has a cylinder 11 to retain water and in which the water is heated. The weight of the cylinder 11 is primarily borne by the base portion 12.
  • a casing 13, typically formed of sheet steel is retained around the rim of the base portion 12 to surround the cylinder 11. Usually, two of the free edges of the sheet steel of the casing 13 are secured together by a vertical weld so that the sheet is in the form of a tube.
  • a lid 14 is located in similar fashion on the second edge of the casing 13. Liquid prepolymer is fed into the volume between the cylinder 11 and the casing 13, which prepolymer polymerises into a solid insulating material. As the polymerisation step takes place, the volume of the insulating material increases substantially.
  • the engagement of the casing 13 with the base portion 12 is shown in more detail in Figure 3 .
  • the base portion 12 is formed of a plastics material such as polypropylene, and has an outer wall 15 and a smaller retaining wall 16 which together form a circular channel 17, passing around the circumference of the base portion 12, into which the casing 13 is inserted.
  • a sealant material 18 is added into the channel 17.
  • the sealant 18 is for example a polyurethane material which moulds itself around the edge of the casing 13 as the casing 13 is dropped into position.
  • the lid 14 - sometimes referred to as a top-moulding - similarly has an outer wall 19 and a retaining wall 20 forming a channel 21 to hold the casing 13.
  • An inlet means is provided in the case 13 to allow the polymer precursor to be pumped in. Care needs to be taken that any apertures within the casing 13 are sealed, especially those around any pipes leading to and out of the cylinder 11.
  • the heater is assembled as described above in simpler fashion to that in the prior art in that the casing 13 is fitted into the channel 17 of the base portion 12.
  • the lid 14 is placed on the free, upper edge of the casing 13.
  • axial pressure can be exerted on these components causing the casing 13 to 'bite' into the polypropylene and form a seal with the base portion 12 and the lid 14.
  • a clamp can be applied to further enhance the effect and ensure the casing 13 remains in place, pushed into the base portion 12 and lid 14.
  • Liquid polyurethane prepolymer is then added into the heater 10, in the space between the cylinder 11 and casing 13.
  • a gas carbon dioxide
  • the gas collecting together to form bubbles and ensuring that the polymeric material formed is a foam.
  • the volume of the polyurethane therefore increases, eventually filling the space with insulating polymer.
  • the seal formed by the casing 13 cutting into the polypropylene prevents or hinders the initially liquid prepolymer from running out of the heater 10.
  • This facility is enhanced by the presence of the sealant material 18 engaged with the casing 13 to form a further barrier to the escape of the prepolymer.
  • the pressure of the expanding foam polymer pushes the base of the casing 13 against the outer wall 15, again forming a yet further seal, preventing the polymer from running out of the heater.
  • any polymer which does flow through the additional seals only does so after a longer time than is the case with conventional methods.
  • Such material is therefore already partially set and hence more viscous, so that its passage to the outside of the heater is slower.
  • the partially set polymer tends to set and self seal before it has a chance to exit the heater and prevents other material from exiting.
  • the requirement to include wiper blades as in prior art manufacturing methods, to remove any escaped polymer is therefore obviated.
  • the heater 40 includes a moulding around a pipe 41 which penetrates through the wall of the cylinder 42.
  • Such pipes are sources of heat loss from water within the cylinder 42 and additional insulating mouldings 43 are often placed around the pipes between the cylinder 42 and the outer casing 44.
  • the moulding 43 serves an important function of sealing any apertures in the outer casing through which a pipe 41 passes. Moreover, clamping together of the outer casing 44 to the cylinder 42 in the directions shown by arrows D is applied and maintained until the polymeric insulation material has been formed and the moulding 43 assists in enabling position tolerances of the pipe 41 to be met.
  • Typical materials from which the moulding 43 is formed is an expanded polystyrene (EPS).
  • Figure 4 shows two further mouldings 45, 46.
  • the moulding 43 can additionally be used to facilitate fitment and ergonomic placement of control panels and the like.
  • a foaming agent can be included to increase the material's volume.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Insulation (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
EP11250707.4A 2010-08-05 2011-08-05 Verbessertes Verfahren zur Isolierung eines Heißwasserzylinders Active EP2423618B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB1013229.8A GB201013229D0 (en) 2010-08-05 2010-08-05 An improved method of insulating a hot water cylinder

Publications (3)

Publication Number Publication Date
EP2423618A2 true EP2423618A2 (de) 2012-02-29
EP2423618A3 EP2423618A3 (de) 2013-01-02
EP2423618B1 EP2423618B1 (de) 2016-05-04

Family

ID=42931277

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11250707.4A Active EP2423618B1 (de) 2010-08-05 2011-08-05 Verbessertes Verfahren zur Isolierung eines Heißwasserzylinders

Country Status (3)

Country Link
EP (1) EP2423618B1 (de)
ES (1) ES2576869T3 (de)
GB (1) GB201013229D0 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4517210A1 (de) * 2023-08-28 2025-03-05 Compagnie Industrielle des Chauffe-Eau Wasserspeichervorrichtung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1386696A (fr) * 1964-02-11 1965-01-22 Thomson Houston Comp Francaise Perfectionnements apportés à un réservoir à accumulation d'eau chaude et à sa technique de réalisation
US4907569A (en) * 1989-01-05 1990-03-13 A.O. Smith Corporation Water heater with skirt ring dam
US4974551A (en) * 1989-02-16 1990-12-04 Nelson Thomas E Water heater and method of fabricating same
US5209368A (en) * 1992-06-09 1993-05-11 Bradenbaugh Kenneth A Insulated tank construction and improved self positioning sealing device for use therein
CA2092348A1 (en) * 1993-03-24 1994-09-25 Claude Lesage Insulating support base with elevated circumferential ridge
IT1297428B1 (it) * 1997-12-29 1999-12-17 Merloni Termosanitari Spa Scaldaacqua di materiale plastico resistente a pressione
US6588378B1 (en) * 2002-08-28 2003-07-08 Rheem Manufacturing Company Water heater bottom pad/foam dam apparatus with integrated tank support members

Non-Patent Citations (1)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4517210A1 (de) * 2023-08-28 2025-03-05 Compagnie Industrielle des Chauffe-Eau Wasserspeichervorrichtung
FR3152576A1 (fr) * 2023-08-28 2025-03-07 Compagnie Industrielle Des Chauffe-Eau Dispositif de stockage d’eau

Also Published As

Publication number Publication date
ES2576869T3 (es) 2016-07-11
GB201013229D0 (en) 2010-09-22
EP2423618A3 (de) 2013-01-02
EP2423618B1 (de) 2016-05-04

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