EP3809071A1 - Verschlusssystem für kühlschränke und kühlschrank mit dem verschlusssystem - Google Patents

Verschlusssystem für kühlschränke und kühlschrank mit dem verschlusssystem Download PDF

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Publication number
EP3809071A1
EP3809071A1 EP20201906.3A EP20201906A EP3809071A1 EP 3809071 A1 EP3809071 A1 EP 3809071A1 EP 20201906 A EP20201906 A EP 20201906A EP 3809071 A1 EP3809071 A1 EP 3809071A1
Authority
EP
European Patent Office
Prior art keywords
fixed frame
door
closing system
frame
refrigerator
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
EP20201906.3A
Other languages
English (en)
French (fr)
Other versions
EP3809071B1 (de
Inventor
Daniele Marzaro
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.)
OSCARTIELLE SpA
Original Assignee
OSCARTIELLE SpA
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Publication of EP3809071A1 publication Critical patent/EP3809071A1/de
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Publication of EP3809071B1 publication Critical patent/EP3809071B1/de
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Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F25D23/02—Doors; Covers
    • F25D23/028—Details
    • 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
    • F25D2321/00—Details or arrangements for defrosting; Preventing frosting; Removing condensed or defrost water, not provided for in other groups of this subclass
    • F25D2321/14—Collecting condense or defrost water; Removing condense or defrost water
    • F25D2321/141—Removal by evaporation
    • F25D2321/1413—Removal by evaporation using heat from electric elements or using an electric field for enhancing removal

Definitions

  • the present invention concerns a closing system for refrigerators, more specifically for supermarket refrigerators.
  • the present invention furthermore concerns a refrigerator comprising such a closing system and a process for making the components of said closing system.
  • the first category includes "open" refrigerators, which are characterized by the fact that the products are directly exhibited to the final customer, without the interposition of doors.
  • the second category is that of "closed" refrigerators, which are characterized by the presence of a closing system designed to close the refrigerating compartment, comprising a door for accessing said compartment, interposed between the product and the customer.
  • Said closed refrigerators offer the advantage that less energy is required to maintain a low temperature inside them, thanks exactly to the presence of said closing system with door.
  • the thermal efficiency of the closing system of the refrigerator thus contributes in a substantial manner to the overall energy efficiency of the refrigerator itself.
  • the known closing systems for refrigerators comprise a fixed frame associated with a door frame to which a glass pane or another transparent panel is glued.
  • the fixed frame and the door frame are generally made of section bars in aluminium or other metals, or section bars in composite materials such as PVC and aluminium composite materials.
  • a first drawback of said closing systems of the known type lies in that for their production many operations are required to process and assemble the section bars themselves and respectively obtain the fixed frame and the door frame, together with a series of successive processing operations on the frames obtained in this way so that they can be fixed to one another and to the refrigerator.
  • Said processing operations comprise, for example, the execution of holes for the screws used to fix the frames to the refrigerator, the creation of suitable seats for fixing the hinges or even the creation of seats for positioning heating means, such as electrical heating cables, around the fixed frame in order to avoid the formation of condensation on the glass.
  • a second drawback of said closing systems of the known type lies in that the materials typically used to make the section bars that constitute the fixed frame and the movable frame are thermally conductive materials, which thus tend to reduce the thermal efficiency of the closing system and consequently the overall energy efficiency of the refrigerator itself.
  • metallic fixing bodies are generally used which, even if they ensure high resistance to stress, provide low thermal insulation between the inside of the refrigerator and the outside (that is, the room where the refrigerator itself is installed).
  • the high thermal conductivity of these materials favours the formation of condensation that accumulates in proximity to the fixing bodies and that can be eliminated using electrical heating means which increase the energy consumption associated with the system.
  • the main task of the present invention is to provide a closing system for refrigerators which is able to solve the drawbacks and overcome the limitations of the known technique, being simple to carry out, assemble and install on the refrigerator and at the same time extremely efficient from the thermal point of view.
  • the present invention concerns also a refrigerator comprising such a closing system and a process for making said closing system.
  • the closing system for refrigerators indicated as a whole by the reference number 1 comprises:
  • the door 5 comprises a door frame 7 and a panel 9 fixed to the door frame 7, preferably made of a transparent material.
  • both the fixed frame 3 and the door frame 7 are made of high density polyurethane through moulding techniques (as described below, the expression “moulding techniques” includes also co-moulding techniques).
  • the fixed frame 3 and the door frame 7 are made of a polyurethane whose density is higher than 200 Kg/m 3 , preferably higher than 250 Kg/m 3 , more preferably equal to approximately 400 Kg/m 3 , measured according to standard DIN53420.
  • the fixed frame 3 and the door frame 7 are made of a polyurethane whose hardness is included between 40 and 80 Shore D, and is preferably equal to approximately 55 Shore D, measured according to standard DIN53505.
  • the fixed frame 3 and the door frame 7 are made of a polyurethane whose flexural modulus of elasticity is included between 400 and 680 MPa, and is preferably equal to approximately 540 MPa, measured according to standard DIN53432.
  • the fixed frame 3 and the door frame 7 are made of a polyurethane whose resistance to impacts is included between 7 and 13 KJ/m 2 and is preferably equal to approximately 10 KJ/m 2 , measured according to standard DIN53432.
  • the fixed frame 3 and the door frame 7 are made through moulding and/or co-moulding techniques for the injection of two-component materials, preferably in a thermostatic mould made from aluminium milled from a solid block.
  • the fixed frame 3 and/or the door frame 7 comprise structural reinforcing elements 11, visible in particular in Figure 8 , buried in the high density polyurethane, wherein said fixed frame 3 and/or said door frame 7 are made of high density polyurethane through co-moulding techniques.
  • the structural reinforcing elements 11 are buried at least in both the uprights 31 of the fixed frame 3, preferably substantially along the entire length of the same.
  • the structural reinforcing elements 11 comprise reinforcing bars such as, for example, U-shaped profiles in metallic material like those shown in Figure 8 .
  • the closing system 1 comprises at least one seat 13, 15 suited to house means for preventing the formation of condensation obtained, directly through the moulding of the high density polyurethane, in the face 18 of the fixed frame 3 which in the configuration of use of the closing system 1 faces the door 5.
  • said at least one seat 13, 15 extends along the whole perimeter of the fixed frame 3.
  • the closing system 1 comprises one pair of said seats 13, 15 suited to house the means for preventing the formation of condensation.
  • a first seat 13 is configured to accommodate a first means for preventing the formation of condensation, constituted by an electrical heating cable, while a second seat 15 is configured to accommodate a second means for preventing the formation of condensation, constituted by a pipe with a hot gas recovered from a compressor of the refrigerator F flowing therethrough.
  • the fixed frame 3 of the closing system 1 is configured in such a way that, according to the needs, it can accommodate either an electrical heating cable or a pipe with a hot gas recovered from a compressor of the refrigerator F flowing therethrough. It can also be decided not to install any means for preventing the formation of condensation. In that case, the seats 13 and 15 remain empty.
  • the at least one seat 13, 15 is situated inside a cavity 33 obtained in the face 18 of the fixed frame 3, wherein said cavity 33 can be closed through the application of a closure profile 19, for example made of PVC.
  • the cavity 33 is directly created in the high density polyurethane through a moulding process.
  • the fixed frame 3 and the door frame 7 are mutually associated by means of one pair of hinges 17, in such a way as to define a hinged door, as shown in Figure 21 .
  • Each hinge 17 comprises one pair of elements 170 and 172 which are mutually hinged to each other.
  • the fixed frame 3 comprises at least one pair of first fixing seats 30 suited to fix a first element 170 of the pair of elements 170, 172 of the hinge 17, wherein said first seats 30 are obtained in the high density polyurethane through moulding techniques.
  • the door frame 7 comprises one pair of second fixing seats 70 suited to fix a second element 172 of the hinge 17, wherein said second seats 70 are obtained in the high density polyurethane through moulding techniques.
  • the fixed frame 3 comprises two pairs of said first fixing seats 30.
  • the door frame 7 can thus be associated with a first pair of said two pairs of first fixing seats 30 to define a first opening direction for the door 5 or with a second pair of said two pairs of first fixing seats 30 to define a second opening direction for the door 5, opposite said first direction.
  • the opening direction of the door 5 can be selected at the moment of installation of the closing system 1 on the refrigerator F, by simply fixing the hinges 17 to the one or the other pair of first fixing seats 30.
  • the first fixing seats 30 are obtained in the upper side 20 and in the underside 22 of the crosspieces 32 of the fixed frame 3.
  • the second fixing seats 70 are obtained in the upper side 23 and in the underside 24 of the crosspieces 72 of the door frame 7.
  • the first seats 30 comprise a hole 34 suited to accommodate a screw for fixing the first element 170 of the hinge 17 which, as shown in Figure 21 , may comprise a fixing bracket 173.
  • the second seats 70 are defined by a hole 73 suited to house at least one part of the second element 172 of the hinge 17.
  • the second element 172 of the hinge 17 comprises a fixing bracket 174 and a fixing body, not visible in the attached figures.
  • the fixing body can be inserted in the hole 73, while the fixing bracket 174 can be fixed to the door frame 5 through screws inserted in the holes 75.
  • first seats 30 and the second seats 70 are directly created in the high density polyurethane through a moulding process.
  • the door frame 7 is slidingly associated with the fixed frame 3.
  • the fixed frame 3 comprises a plurality of through holes 36 made in the high density polyurethane for fixing the fixed frame 3 to the frame T of the refrigerator F with fixing screws.
  • Said through holes 36 are made at least in the crosspieces 32 of the fixed frame, in a number higher than or equal to two per each crosspiece 32. Said through holes 36 are directly obtained in the high density polyurethane through a moulding process.
  • the closing system 1 comprises a plurality of fixed frames 3 associated with one another in a modular manner and suited to be fixed to the opening of the refrigerator F, and a plurality of doors 5, each associated with a respective fixed frame 3.
  • several fixed frames 3 can be fixed to the opening of the refrigerator F in a modular manner, in a position in which they are side by side so as to cover the entire extension of said opening.
  • Each frame 3 can thus be associated with a respective door 5 in such a way that, after the installation, also the doors are positioned side by side in a modular manner.
  • the closing system comprises a plurality of modules of the fixed frame 3 to which a plurality of modules of the door 5 is associated.
  • each fixed frame 3 may comprise at least one pair of uprights 31.
  • each fixed frame 3 comprises a plurality of fixing bodies 21, directly obtained in the high density polyurethane through a moulding process, 25 arranged on the uprights 31 of the fixed frame 3.
  • Said fixing bodies 21 are configured to be fixed to the frame T of the refrigerator F and/or to corresponding fixing bodies 21 of a contiguous fixed frame of the closing system 1.
  • said fixing bodies 21 make it possible not only to attach the fixed frame 3 to the frame T of the refrigerator F but in particular to attach contiguous fixed frames 3 to one another in a modular manner.
  • each fixing body 21 comprises a through hole 210 suited to be aligned with a corresponding through hole 210 of a contiguous fixing body 21, so that fixing screws can be inserted in said holes between contiguous fixed frames 3.
  • the choice to use polyurethane for making the fixing bodies 21 offers the advantage of obtaining high thermal insulation at the level of the areas where the fixed frame is anchored to the frame T of the refrigerator F.
  • the fixing bodies 21 made with this material make it possible to promote effective insulation also between the inside of the refrigerator F (which can even reach -23° C) and the external environment where said refrigerator F is installed (where the temperature is typically included between 20°- 25°C).
  • Polyurethane thus represents a suitable material for making the fixing bodies 21, since its mechanical characteristics are suited to make the entire closing system 1 highly durable and resistant, and at the same time it makes it possible to obtain a thermally efficient system without areas or points with reduced thermal insulation.
  • making the fixing bodies 21 in polyurethane means obtaining a closing system that is suited to reduce the overall energy consumption of the refrigerator F during its operation.
  • the fixed frame 3 and/or the door frame 5, including the various elements that make them up are completely made of high density polyurethane by means of a moulding and/or co-moulding technique.
  • the panel 9 of the door 5 can be constituted by a glass panel glued to the door frame 7. As shown in Figure 20 , the glass panel can be glued to the perimeter of the face 77 of the door frame 7 that faces towards the outside of the refrigerator F, in its configuration of use.
  • the door frame 7 may comprise a perimeter edge 78 designed to contain the glass panel 9, directly obtained in the high density polyurethane through a moulding process.
  • the door frame 7 comprises a seat 76 for fixing a gasket, created in the inner face 79 of the door frame 7.
  • Said seat 76 is directly obtained in the high density polyurethane through a moulding process and comprises an access hole 760 whose cross section is slightly smaller than the inner cross section 762 of the seat 76 itself, suited to guarantee the correct fastening of the gasket.
  • the door frame 7 can be associated with a handle 25 for opening the door 5 with respect to the fixed frame 3.
  • the present invention concerns also a refrigerator F comprising a closing system 1 as described above.
  • the present invention concerns also a process for making a closing system 1 as described above, comprising at least the following steps:
  • the closing system 1 is installed on the refrigerator F by assembling first the fixed frame 3 on the frame T of the refrigerator F and then the door 5 on the fixed frame 3, through the installation of the hinges 17.
  • the closing system for refrigerators fulfils its task and achieves the set objects, being simple and economic to produce, to assemble and to install on the refrigerator and at the same time extremely efficient from the thermal point of view.
  • An advantage of the closing system for refrigerators according to the invention lies in that the fixed frame and the door frame, including their various components, can be substantially produced through a single moulding or co-moulding operation, with no need for special additional processing steps such as the application of inserts or reinforcements or the execution of holes or seats.
  • Another advantage offered by the closing system according to the invention lies in that the high density polyurethane used for moulding the fixed frame and the door frame has thermal insulating properties and therefore the closing system improves the thermal efficiency and thus the overall energy efficiency of the refrigerator.
  • the use of high density polyurethane for making the fixed frame and the door frame offers the advantage of preventing the formation of condensation on the glass, which is generally due to the difference in temperature between the inside of the refrigerator and the external environment, to the point that it is possible to eliminate the use of heating means for preventing the formation of said condensation.
  • the thermal power that said heating means for preventing the formation of condensation must generate is considerably lower if compared to the refrigerators provided with closing systems of the known type.
  • Another advantage offered by the closing system according to the invention lies in that it is possible to choose whether to apply said heating means for preventing the formation of condensation or not, and also to choose the type of means to be adopted, with no need to modify the design, in particular the design of the fixed frame.
  • the fixed frame is configured in such a way that it can be equipped with different types of anti-condensation heating means.
  • Another advantage of the closing system according to the invention is represented by its modularity and thus by the possibility to place a plurality of fixed frames with the respective doors side by side in a modular manner, according to the size of the refrigerator.
  • Another advantage is represented by the reversibility of the door opening direction, reversibility that can be selected even upon installation on the refrigerator, or upon retrofitting of the refrigerator itself.

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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)
  • Refrigerator Housings (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
EP20201906.3A 2019-10-15 2020-10-15 Verschlusssystem für kühlschränke und kühlschrank mit dem verschlusssystem Active EP3809071B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102019000018899A IT201900018899A1 (it) 2019-10-15 2019-10-15 Sistema di chiusura per frigoriferi e relativo frigorifero.

Publications (2)

Publication Number Publication Date
EP3809071A1 true EP3809071A1 (de) 2021-04-21
EP3809071B1 EP3809071B1 (de) 2022-05-11

Family

ID=69743727

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20201906.3A Active EP3809071B1 (de) 2019-10-15 2020-10-15 Verschlusssystem für kühlschränke und kühlschrank mit dem verschlusssystem

Country Status (4)

Country Link
EP (1) EP3809071B1 (de)
ES (1) ES2924688T3 (de)
IT (1) IT201900018899A1 (de)
PL (1) PL3809071T3 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5255473A (en) 1989-12-11 1993-10-26 Ardco, Inc. Refrigerator door assembly with stylized substantially all glass front
DE202006013838U1 (de) 2006-09-09 2006-12-07 Kleiß, Joachim, Dipl.-Ing. Wärmegedämmtes Bauprofil aus Polyurethan (PUR) mit innen liegendem Verstärkungsprofil aus glasfaserverstärktem Kunststoff GfK
US20120028027A1 (en) 2008-02-15 2012-02-02 Bbg Gmbh &Co.Kg Heat-Insulating Profile Strip for Window and Facade Components, Production Method and Moulding Tool
EP2908074A1 (de) 2014-02-13 2015-08-19 Cisaplast S.P.A. Schrankseitentürrahmen für Kühlschränke

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5255473A (en) 1989-12-11 1993-10-26 Ardco, Inc. Refrigerator door assembly with stylized substantially all glass front
DE202006013838U1 (de) 2006-09-09 2006-12-07 Kleiß, Joachim, Dipl.-Ing. Wärmegedämmtes Bauprofil aus Polyurethan (PUR) mit innen liegendem Verstärkungsprofil aus glasfaserverstärktem Kunststoff GfK
US20120028027A1 (en) 2008-02-15 2012-02-02 Bbg Gmbh &Co.Kg Heat-Insulating Profile Strip for Window and Facade Components, Production Method and Moulding Tool
EP2908074A1 (de) 2014-02-13 2015-08-19 Cisaplast S.P.A. Schrankseitentürrahmen für Kühlschränke

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ISHIDA Y ET AL., WPI/THOMSON, no. 32, 1990
ISHIDA Y ET AL: "Glass door for refrigerator - comprises reaction injection moulded polyurethane frame with spaced sealed glass plates", WPI / THOMSON,, vol. 1990, no. 32, 27 June 1990 (1990-06-27), XP002730856 *

Also Published As

Publication number Publication date
ES2924688T3 (es) 2022-10-10
IT201900018899A1 (it) 2021-04-15
EP3809071B1 (de) 2022-05-11
PL3809071T3 (pl) 2022-10-10

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