Classifications

• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B3/00—Ohmic-resistance heating
  • H05B3/84—Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
  • A47F3/00—Show cases or show cabinets
  • A47F3/04—Show cases or show cabinets air-conditioned, refrigerated
  • A47F3/0404—Cases or cabinets of the closed type
  • A47F3/0426—Details
  • A47F3/0434—Glass or transparent panels
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
  • F25D23/00—General constructional features
  • F25D23/06—Walls
  • F25D23/065—Details
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
  • F25D2201/00—Insulation
  • F25D2201/10—Insulation with respect to heat
  • F25D2201/14—Insulation with respect to heat using subatmospheric pressure

Definitions

• the invention relates to an insulating glazed element comprising at least two glass sheets separated from each other by a space and at least one support element, in particular for a refrigerated enclosure.
• Glazing is generally placed in a frame allowing it to be supported for use in areas where its thermal insulation properties are sought (building, refrigeration)
• insulating glazing formed by the superposition of glass sheets separated from each other by an air knife or by a space maintained under vacuum, and to heat them over the entire surface of the glass at by means of an electrically conductive layer (EP-A-0 314 477, US-A-3 655 939 and FR-A-2 769 337) or metallic wires powered by electric current (CA-A-885052).
• the second advantage is that it is easy to grab the article finally chosen since the freezer is permanently open in its upper part.
• “box” freezers and despite the use of insulating glass, there is still the problem of condensation or frost on the periphery of the glass surface. Due to their exposure to cold, the periphery of the glazing, less isolated than the rest of the glazed surface, and the elements supporting the glazing are externally at a temperature lower than that of ambient air, which generates condensation both on the glass and on the support.
• the object of the present invention is to produce an insulating glazed element formed from at least two sheets of glass and from at least one profile, which makes it possible to prevent the appearance of condensation and the formation of frost at the periphery.
• the invention provides an insulating glazed element comprising at least two sheets of glass and at least one profile, said element having at least one heating border on at least one face of at least one glass sheet, and the border being covered by the profile and being joined to the profile by a heat conducting joint.
• the edge of the glazing the glass and the profile can be kept at a temperature higher than the dew point of the ambient air, and therefore prevent the formation of condensation and frost on the glass.
• the glazed element comprises several sheets of glass
• the following is designated by: - "external glass sheet” the sheet of glass which is in contact with the ambient air when the latter is in its position of use, - “inner glass sheet” the glass sheet which is in contact with the cold air produced by the refrigerated enclosure, and - “intermediate sheet” a sheet which is located between the outer sheet and the inner sheet,
• the heating border is carried by the external face of the external glass sheet.
• the edge is directly in contact, over its entire surface, with the heat conducting joint, which makes it possible to heat the profile with maximum efficiency.
• the heating border is formed by the deposition of enamel or resin containing electrically conductive particles, such as particles of silver, nickel, zinc, copper, graphite or a precious metal. such as gold, platinum or palladium.
• electrically conductive particles such as particles of silver, nickel, zinc, copper, graphite or a precious metal.
• gold, platinum or palladium such as gold, platinum or palladium.
• the silver particles are preferred, in particular because they have an advantageous conductivity / cost ratio.
• the enamel useful for the invention can be any composition comprising a glass frit, possibly associated with pigments (as colorants, these pigments possibly being part of the frit), and a medium.
• the glass frit can be any glass frit which ultimately makes it possible to form a vitreous matrix on the support, preferably a matrix which can withstand the temperatures required for thermal tempering (maximum temperature of the order of 650 ° C.). For recycling reasons mainly, a frit which contains substantially no lead is preferred.
• the medium ensures the correct suspension of the solid particles and allows the application and temporary adhesion of the enamel to the glass.
• the medium is generally chosen from organics such as pine oil, terpenes, mineral oils, thinners and resins.
• the resin useful for the invention is chosen from resins capable of finally forming a polymer layer on the glass support.
• the resin is an epoxy, polyimide, silicone, polyester or polyacrylate resin.
• the heating border is generally obtained by depositing the enamel or polymer resin composition containing the metal particles on the glass by spraying, by coating with a roller or with a curtain, or by screen printing and by subjecting the glass thus coated to a firing.
• the border may extend over the entire length of one side of the sheet (s) of glass in question, or occupy only part of the length.
• the ends of the border are provided with current supply elements, for example welded or glued terminals, allowing the border to be heated over its entire length.
• the border can be arranged on one side or on several sides.
• the border is carried by at least two sides, advantageously opposite, and better still by three or four sides. In the latter case, the border is advantageously continuous and connected at its two ends to the electric current.
• the length, width, thickness and shape of the border are not critical.
• the invention makes it possible to easily modulate and optimize the heating intensity of the border: by playing in particular on the width, it is possible to easily obtain more heated parts than others within the same strip or several strips. It is however preferable to choose a shape and a size such that the border can be hidden by the profile supporting the glass sheets.
• the covering with the profile allows, when the border is carried by the external face of the outer sheet, to protect it from subsequent damage, such as for example those resulting from the application of certain cleaning products. .
• the thermally conductive seal is generally made of a polymer material comprising conductive particles, for example a silicone or an epoxy resin in combination with alumina particles.
• the heating border is carried by the internal face of the outer glass sheet.
• the heating border is located on the external face of an intermediate glass sheet or of an interior glass sheet.
• This intermediate element can for example be a metal sheet of which at least one of the ends is folded back to form a substantially right angle or a metal profile in L or T shape, and one of the ends being linked to the edge, for example by welding or gluing , and the other or another free end being arranged parallel to the thickness of the glass sheet carrying the border.
• This way of operating gives a larger contact surface between the edge and the thermally conductive seal, which consequently increases the heating efficiency of the profile supporting the glass sheets.
• the glazed element comprises at least two sheets of glass separated from each other by a space and joined at their periphery by a sealing joint, advantageously watertight .
• the element consists of three sheets of glass.
• the outer sheet is a glass sheet having undergone thermal toughening.
• Thermal toughening generates significant stresses in the glass so that when it is broken accidentally, it breaks up into pieces small enough not to cause injury.
• the tempering step is an operation known per se: by way of illustration, it is possible, for example, to carry out the tempering at a temperature of the order of 550 to 650 ° C. for 2 to 4 minutes depending on the thickness of the glass.
• this sheet has one or more heating edges in the form of an enamel deposit, the quenching also makes it possible to cook the enamel.
• FIG. 1 is a diagrammatic representation of a "box" freezer using the glazed element according to the invention
• FIG. 2 is a front view of a glazed element according to the first embodiment of the invention
• FIG. 3 is a vertical section of the glazed element of FIG. 2
• FIG. 4 is a front view of a glazed element according to the second embodiment of the invention
• FIG. 5 is a vertical section of the glazed element of FIG. 4,
• ⁇ Figure 6 is a front view of a glazed element according to the third embodiment of the invention
• ⁇ Figure 7 is a vertical section of the glazed element of Figure 6.
• FIG. 1 represents a refrigerated enclosure 1 of the “tray” freezer type, open on the top, the front and side faces of which are fitted with insulating glass elements 2, 3, 4 in accordance with the invention.
• Each glazed element 2, 3, 4 here consists of one or more profiles forming a frame 5, 6, 7 supporting glass sheets 8, 9, 10.
• FIG. 2 represents a front view of a glazed element according to the first embodiment of the invention.
• Figure 3 is a vertical section of the same element.
• the glazed element comprises two sheets of glass 11, 12, provided with a heating border 18, supported by a frame having the shape of the profile 13.
• the profile 13 is shown in dotted lines in order to make the heating border 18 appear more clearly.
• the glass sheets 11, 12 are separated from each other by a space 14 and joined at the periphery by a sealing joint 15, impervious to moisture.
• a short distance from the edge of the sheets 11, 12 is inserted a hollow profile 16 containing a drying agent, which is fixed to the glass by a bonding bead 17.
• the outer sheet 11 is provided, on its face external, of a heating border 18 of variable width which extends on the four sides of the sheet whose ends carry a terminal 19 for the electrical supply.
• a thermally conductive seal 20 provides the connection between the edge 18 and profile 13.
• FIG. 4 represents a front view of a glazed element according to the second embodiment of the invention and FIG. 5 is a vertical section of this element.
• the element consists of glass sheets 11, 12 supported by the profile 13, also shown in dotted lines in FIG. 4.
• the glass sheets 11, 12, separated by the space 14 are joined to the periphery by the sealing joint 15.
• the space 14 includes the hollow section 16 containing the desiccant and the adhesive bead 17 (not shown).
• the outer sheet 11 here carries, on the internal face, two separate heating edges 21, 22, of the same width and of length substantially equal to the sides of the sheet 11, the ends of which carry lugs 19.
• Intermediate elements 23 are fixed on the edges 21, 22 by gluing or welding at the end 24, the end remaining free 25 being folded towards the sheet 11 and arranged in a plane substantially parallel to the thickness of the sheet. The entire surface of the end 25 is thus exposed in contact with the seal 20 to heat the profile 13.
• FIG. 6 represents a front view of a glazed element according to the third embodiment of the invention and FIG. 7 is a vertical section of this element.
• the element here consists of three glass sheets 11, 12, 26 supported by the profile 13, also shown in dotted lines in FIG. 6.
• the glass sheets 11, 12, 26, separated by the spaces 14, 27 are joined at the periphery by the sealing joint 15.
• Each space 14, 27 contains the hollow profile 16 containing the desiccant and the adhesive bead 17 (not shown).
• the intermediate sheet 12 here carries, on the external face, a heating border 28, formed of the upper 29 and lower 30 bands connected to one another on one side, the ends of which provided with lugs 19 are located on the side of the sheet. opposes the above.
• the intermediate element 31 is here a T-shaped profile whose core 32 is fixed to the strip 29 of the heating edge 28 and the wings 33 are arranged in a plane substantially perpendicular to the plane of the sheet 26 carrying the edge.
• the wings 33 are joined to the profile 13 by the conductive joint 20.

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• 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)
• Joining Of Glass To Other Materials (AREA)
• Securing Of Glass Panes Or The Like (AREA)
• Glass Compositions (AREA)
• Refrigerator Housings (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=8860539

Family Applications (1)

Country Status (8)

Families Citing this family (28)

Family Cites Families (22)

• 2001
  • 2001-02-28 FR FR0102708A patent/FR2821519B1/fr not_active Expired - Fee Related
• 2002
  • 2002-02-27 DE DE60208160T patent/DE60208160T2/de not_active Expired - Lifetime
  • 2002-02-27 US US10/469,133 patent/US7246470B2/en not_active Expired - Fee Related
  • 2002-02-27 WO PCT/FR2002/000708 patent/WO2002069673A1/fr active IP Right Grant
  • 2002-02-27 AT AT02714266T patent/ATE313931T1/de not_active IP Right Cessation
  • 2002-02-27 DK DK02714266T patent/DK1364557T3/da active
  • 2002-02-27 ES ES02714266T patent/ES2254660T3/es not_active Expired - Lifetime
  • 2002-02-27 EP EP02714266A patent/EP1364557B1/de not_active Expired - Lifetime

Non-Patent Citations (1)

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