WO2012152648A2

WO2012152648A2 - Refrigeration device, particularly a domestic refrigeration device

Info

Publication number: WO2012152648A2
Application number: PCT/EP2012/058113
Authority: WO
Inventors: Heiko Wendland; Martin Zimmermann
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2011-05-06
Filing date: 2012-05-03
Publication date: 2012-11-15
Also published as: DE102011075389A1; WO2012152648A3

Abstract

The invention relates to a refrigeration device, particularly a domestic refrigeration device, which comprises a housing (3) that delimits a cooling chamber (1), and a device door (5), each having inner and outer delimiting walls (7, 9) and a thermally insulating layer (11) which is produced therebetween by means of foaming and in which an insulation element, particularly a vacuum insulation panel (17), is introduced and secured to a delimiting wall (9) using a foamable liquid bonding agent (19) that has a boundary surface (20) able to be brought into contact with said thermally insulating layer (11). According to the invention, the boundary surface (20) of the liquid bonding agent (19) has an irregular contour shape comprising material bulges (22) and indentations (24), particularly with regard to a border edge (33) of said vacuum insulation panel (17).

Description

Refrigerating appliance, in particular household refrigerating appliance

The invention relates to a refrigerator according to the preamble of claim 1 and a method for producing such a refrigerator according to claim 7.

To increase the energy efficiency of such a refrigeration unit, vacuum insulation panels can be arranged in the foamed insulation layer between the device outer walls and the inner container defining the cooling space. Such a vacuum insulation panel can be pre-positioned on the outside of the device by means of an adhesive tape. Subsequently, the vacuum insulation panel can be firmly integrated into the insulating layer during the insulating foaming.

From DE 10 2008 026 528 A1 a generic refrigeration device is known, the housing and / or appliance door each having inner and outer boundary walls and a heat insulating layer between them produced by foaming. The vacuum insulation panel is introduced into the heat insulating layer in a pre-foaming step. For this purpose, the outer housing wall is inserted into a mold. On the inside of the outer housing wall, a liquid starting component of a foamable liquid adhesive is then applied, onto which the vacuum insulation panel is laid loosely. The launched on the liquid adhesive

Vakuumisolationspaneel is bordered by a likewise lying on the mold mold frame. Subsequently, the top of the mold frame is closed foam-tight with a cover plate until the liquid adhesive is foamed and cured under pressure.

In the case of the pre-foaming step known from DE 10 2008 026 528 A1, the foaming liquid adhesive flows into contact with the mold frame, as a result of which a space is created between the mold frame and the foamed liquid adhesive

Bonding results, the demolding of the prefoamed composite body consisting of the housing outer wall and the vacuum insulation panel,

production technology adversely affected. In addition, the interface of the foamed liquid adhesive, which bears against the mold frame, has a flat, flat surface

Surface structure executed. The interface runs continuously parallel to the edge the Vakuumisolationspaneels and is brought into the subsequent Isolierschäum-step cohesively in bonding with the surrounding heat insulating layer.

The object of the invention is to provide a refrigeration appliance, in particular domestic refrigeration appliance, as well as a process for its production, which have a production-technically simple assembly of the refrigeration appliance as well as a high degree of safety

Bonding strength between the liquid adhesive and the heat insulating layer allows.

The object is solved by the features of claim 1 or claim 7. Preferred embodiments of the invention are disclosed in the subclaims.

The invention relates to a refrigeration device having a housing defining the cooling space and a door of the appliance. The housing and / or the door can each inner and outer boundary walls and one between them, generated by foaming

Have heat insulating layer. In the heat insulating layer, a vacuum insulation panel is inserted. One of the two boundary walls can be joined together with the vacuum insulation panel to a composite body or to a pre-assembly. In this case, the liquid adhesive can first be foamed and cured in a first pre-foaming step upstream of the insulating foam in order to provide the abovementioned composite body. The invention is based on the fact that at a flat, level interface between the

Liquid adhesive and the heat insulating only a cohesive

Bonding is enabled in order to achieve a total bond integrity in the material structure of the door or the refrigerator housing. to

Increase of this bond strength, the interface of the liquid adhesive on an irregular contour with material bulges and indentations, which alternate along the peripheral edges of the vacuum insulation panel in an irregular manner. In this way, in addition to or as an alternative to the above

Materialschlussverbindung the heat insulating layer at least partially positively in engagement with the material bulges and indentations of the interface of the

Liquid adhesive can be brought, whereby the bond strength in the material structure of the housing or the door can be increased. Instead of a

Vacuum insulation panel can also be used any other insulating. Under a refrigeration device is in particular a household refrigeration appliance understood, ie a refrigeration appliance for household management in households or possibly in the

Catering area is used, and in particular serves to store food and / or drinks in household quantities at certain temperatures, such as a refrigerator, a freezer, a fridge-freezer, a freezer or a wine storage cabinet.

Under a curable or foamable liquid adhesive are substances and

Understand mixtures of substances that solidify after their reaction with atmospheric oxygen or other reaction component of its liquid doughy state, at least to a tough elastic, but preferably hard state. Preferably, the liquid adhesive and also the heat insulating layer may be a polyurethane foam having pentane as the blowing agent. The liquid adhesive can be applied punctiform, linear or in any desired free form to carry out the pre-foaming step.

In contrast to the state of the art mentioned in the introductory part of the description, according to the invention, the flow cross-section of the liquid adhesive can be varied in the region of the peripheral edge of the vacuum insulation panel in order to achieve such an irregularly designed interface of the liquid adhesive. In the area offset from the edge of the vacuum insulation panel, on the other hand, the

Liquid adhesive have a constant flow cross-section.

The liquid adhesive may preferably be a tack-optimized foam, which may have a reduced viscosity compared to the thermal insulating layer. By way of example, the liquid adhesive can be a polyurethane foam which has water as an additional blowing agent. In contrast, the heat insulating layer can be optimized for insulation

Polyurethane foam having pentane as an additional propellant. As already mentioned above, in the pre-foaming step, the first boundary wall and the vacuum insulation panel can be joined together with the liquid adhesive to form a solid component composite. Subsequently, the component composite can be fed to a foaming system, in which the still liquid starting component of the heat insulating layer between the inner and in an insulating foam step outer boundary walls introduced, foamed and cured. After the insulating foaming step, therefore, the material structure on the two boundary walls, of which on the inside of the first boundary wall of the above

Composite body is attached. In the composite body, the vacuum insulation panel may be spaced from the first boundary wall by a predetermined layer thickness.

In the, filled with liquid adhesive space between the

Vakuumisolationspaneel and the first boundary wall can also have a

Refrigeration appliance component, in particular a condenser, be arranged. The

Refrigeration appliance component can be completely integrated in the foamed liquid adhesive. The condenser is part of a known per se

Refrigerant circuit that extracts heat from the cold room that is released to the environment via the condenser. The condenser is preferably in contact with the inside of the housing outer wall in order to achieve a favorable heat coupling. To ensure that the condenser is largely thermally decoupled from the cooling space, the vacuum insulation panel is arranged between the condenser and the cooling space. To prepare the pre-foaming step, firstly the vacuum insulation panel and the boundary wall can be positioned at a predetermined gap distance away from one another in a molding tool. In the space between the vacuum insulation panel and the boundary wall is the liquid

Introduced starting component of the liquid adhesive, then foamed and then cured. The space between the vacuum insulation panel and the boundary wall is not laterally sealed foam-tight during the pre-foaming step, but rather designed open. The foaming of the

Liquid adhesive is therefore - in contrast to the subsequent Isolierschäum step - largely without pressure build-up. In this way, the frothy

Liquid adhesive in free flow fill the gap and flow into the area of the edge of the vacuum insulation panel. The foaming liquid adhesive can therefore run dead on the edge of the vacuum insulation panel due to the lack of lateral boundary to the formation of material bulges and indentations. Accordingly, the flow cross section of the liquid adhesive can vary freely in the region of the peripheral edge of the vacuum insulation panel. In the subsequent demolding step, the composite body thus formed by the

Mold are removed. Since the liquid adhesive does not get into adhesive connection with the mold during the pre-foaming step, the

Entformungsvorgang perform easily, without mechanically separating the cured liquid adhesive from a mold frame of the mold.

The advantageous embodiments and / or further developments of the invention explained above and / or reproduced in the dependent claims can be used individually or else in any desired combination with one another, for example in the case of clear dependencies or incompatible alternatives.

The invention and its advantageous embodiments and further developments and advantages thereof are explained in more detail below with reference to drawings. Show it:

Fig. 1 in a perspective view of a refrigeration device with a, in a

Side wall foamed condenser; FIG. 2 shows a sectional view along the sectional plane I-I from FIG. 1; FIG.

FIGS. 3 to 5 are views illustrating a method of manufacturing the refrigerator housing; and FIG. 6 is a perspective sectional view of a housing side wall with partially omitted inner boundary wall and partially omitted insulating layer.

In Fig. 1, a refrigeration device with a, a refrigerator 1-defining housing 3 and a laterally hinged appliance door 5 is shown. The refrigeration device housing 3 has a plastic inner container 7 and device outer walls 9, between each of which one, produced by foaming Wärmeisolierschicht 1 1 is introduced. In the same way, the door 5 is constructed to be heat-insulating, each having an inner lining and an outer lining with intermediate heat insulation. has lierschicht. In addition, in one, in the device side direction x front side wall of the housing 3 in FIG. 1, a condenser 13 is provided, the meandering running condenser pipe between the inner container 7 and the device outer wall 9 is foamed. The condenser 13, together with other components of a known refrigerant circuit and causes in the cooling mode, heat dissipation to the environment.

2, the structure of the side wall of the housing 3 is shown in a sectional view. Accordingly, the condenser pipe 13 is directly in contact with the inside 15 of the device outer wall 9. To a layer thickness di spaced from the condenser 13, a vacuum insulation panel 17 is provided, which is arranged plane-parallel between the device outer wall 9 and the inner side wall of the inner container 7. The vacuum insulation panel 17 is used for thermal decoupling of the condenser 13 from the cooling space 1. The vacuum insulation panel 17 is also spaced over a further layer thickness d ₂ of the side wall of the inner container 7.

As is further apparent from FIG. 2, the liquid adhesive 19 is in a materially adhesive bond with the surrounding area at its edge-side interface 20

Heat insulating layer 1 1. The contour of the boundary surface 20 of the liquid adhesive 19 is shown in the partial sectional view of FIG. 6. As a result, the

Boundary surface 20 along the peripheral edge 33 of the heat insulation panel 17 irregular with mutual bulges material 22 and Materialeinzügen 24. These are with respect to the peripheral edge 33 of the vacuum insulation panel 17 in the lateral direction reset by the peripheral edge 33 and project beyond this. This results in pocket-like recesses, which are filled during the insulating foaming with the heat insulating layer 1 1. The heat insulating layer 1 1 is therefore at least partially brought into a positive connection with the material bulges / indentations 22, 24 of the interface 20 in addition to the already mentioned adhesive connection, whereby the composite stiffness of the shown in FIG. 6 material construction of the housing wall is increased.

The device outer wall 9, the condenser 13 and the vacuum insulation panel 17 are joined together by means of a foamed liquid adhesive 19 prior to assembly with the inner container 7 to a pre-assembly 21. The production This pre-assembly 21 will be explained below with reference to FIGS. 3 to 5. According to FIG. 3, in a first method step I, the cross section is first of all

trough-shaped boundary wall 9 placed in a mold, not shown. Subsequently, the condenser pipe is prepositioned by means of adhesive tapes 35 on the inside 15 of the housing wall 9 and a liquid starting component of the liquid adhesive 19 applied to the condenser pipe 13 and the inside 15.

Subsequently, the vacuum insulation panel 17 is placed on the liquid liquid adhesive 19. Above the loose component composite, consisting of the vacuum insulation panel 17 and the housing outer wall 9, a hold-down 27 is positioned according to the Fig. 3 and 4, which is spaced over a height h (Fig. 4) from the housing outer wall 9. As a result, a still free gap 25 is defined which is filled by the foaming and hardening liquid adhesive 19 during the prefoaming step II (FIG. 4). In the pre-foaming step II, the vacuum insulation panel 17 is pushed up against the bottom 23 of the hold-down 27, whereby the vacuum insulation panel 17 is positionally stabilized. The gap 25 between the

Hold-down 25 and the housing outer wall 9, however, remains open at the edge, so that the liquid adhesive 19 runs dead in a free flow laterally outward movement, without pressing against a mold stop, such as a mold frame. This results in a comparison with a foam-tight closed foaming a in

The amount of liquid adhesive 19 and its distribution on the inside 15 of the housing outer wall 9 is such that the liquid adhesive 19 in a central region 32 (FIG. 4) of the vacuum insulation panel 17 with a constant

Flow cross-section, while it terminates in an outer edge region 36 (Fig. 4) of the vacuum insulation panel 17 at its peripheral edge 33 with a varying flow cross-section, i. After the pre-foaming step II, the hold-down 27 and the housing outer wall 9 are separated in the Entformungsrichtungen E from each other. Since according to the invention an adhesive bond between the foamed liquid adhesive 19 and the hold-down 27 and the mold, not shown, is avoided, the

Entformungsvorgang be carried out easily. The composite body 21 is subsequently to prepare an insulating foam step III (FIG. 5) in one

Foaming system with the inner container 7 joined together. The

Vacuum insulation panel 17 is already in the correct position in FIG. 5 with a predefined distance to the inner container 7, which corresponds to the layer thickness d ₂ positioned.

Subsequently, a Isolierschäumung, in which in the still free cavity 37, a liquid starting component of the heat insulating 1 1 is introduced and then foamed.

LIST OF REFERENCE NUMBERS

1 refrigerator

3 housing

5 appliance door

7 inner container

9 external device wall

1 1 heat insulating layer

13 liquefier

15 inside

17 vacuum insulation panel

19 liquid adhesives

20 interface

21 composite body, pre-assembly unit

22 material bulges

23 Bottom of the hold 27

24 material feeds

25 space

27 hold down

32 middle area of the vacuum insulation panel 17

33 edge

35 tape

36 edge region of the vacuum insulation panel 17th

37 cavity

di, d ₂ layer thicknesses

h distance

E demoulding direction

I, II, III process steps

Claims

Refrigerating appliance, in particular household refrigerating appliance, with a housing (3) bounding a cold room (1) and a door (5), each having inner and outer boundary walls (7, 9) and a heat insulating layer (1 1) produced therefrom by foaming, in an insulation element, in particular a vacuum insulation panel (17), is introduced, which is fastened with a foamable liquid adhesive (19) on a boundary wall (9), which

Liquid adhesive (19) has an interface (20) in contact with the

Heat insulating layer (1 1) can be brought, characterized in that the

Interface (20) of the liquid adhesive (19) has an irregular contour with material bulges (22) and indentations (24), in particular with respect to a peripheral edge (33) of the vacuum insulation panel (17).

Refrigerating appliance according to claim 1, characterized in that the heat insulating layer (1 1) at least partially in positive connection with the material bulges and indentations (22, 24) of the interface (20) of the liquid adhesive (19).

Refrigerating appliance according to claim 1 or 2, characterized in that the

Flow cross section of the liquid adhesive (19) in the region (36) of the peripheral edge (33) of the vacuum insulation panel (17) varies and / or the flow cross-section of the liquid adhesive (19) in one of the peripheral edge (33) of the vacuum insulation panel (17) inwardly offset region ( 32) is constant.

Refrigerating appliance according to one of claims 1, 2 or 3, characterized in that liquid adhesive (19) is in particular a glue-optimized foam with compared to the heat insulating layer (1 1) reduced viscosity.

Refrigerating appliance according to one of the preceding claims, characterized in that the boundary wall (9) and the vacuum insulation panel (17) can be joined together to form a composite body or a pre-assembly unit (21), and / or the Vacuum insulation panel (17) with a layer thickness (di) from the boundary wall (9) is spaced.

6. Refrigerating appliance according to one of the preceding claims, characterized in that between the Vakuumisolationspaneel (17) and the boundary wall (9) a refrigeration device component (13), in particular a condenser, is arranged.

7. Refrigerating appliance according to claim 6, characterized in that the Vakuumisolationspaneel (17) by a layer thickness (di) of the refrigerator component (13) is spaced, and / or the refrigeration appliance component (13) in contact with the

Inside (15) of the first boundary wall (9) and / or by a second

Layer thickness (d ₂ ) from the second boundary wall (7) is spaced.

8. A method for producing a refrigerator, in particular according to one of

preceding claim, wherein in a pre-foaming step (II) the liquid starting component of the liquid adhesive (19) is foamed and cured in a space (25) between the vacuum insulation panel (17) and the boundary wall (9), characterized in that the

Gap (25) is open at the side, so that the flow cross section of the

Liquid adhesive (19) in the region (36) of the peripheral edge (33) of the

Vacuum insulation panel (17) to form material bulges (22) and - insert (24) in the interface (20) of the liquid adhesive (19) varies freely.

9. The method according to claim 8, characterized in that the prefoaming step (II) an insulating foam step (III) follows, in which between the first and second boundary wall (7, 9) introduced heat insulating layer (1 1) foamed and cured becomes.

10. The method according to claim 8 or 9, characterized in that during the pre-foaming step (II) the vacuum insulation panel (17) and the boundary wall (9) with a predetermined gap spacing (di) are positioned to each other.