EP2694889B1 - Domestic refrigerator having a refrigerant circuit system - Google Patents

Description

The invention relates to a household refrigerating appliance, comprising an inner container having at least one coolable storage space for refrigerated goods bounding container walls with rear surfaces, and a refrigerant cycle system with at least two evaporator plates, the front sides abut differently oriented back surfaces of the container walls and occupies the backsides with at least one evaporator tube are.

From the DE 32 04 556 A1 is a thermally insulated housing, in particular for household refrigeration furniture known, with a plastic inner container, on the heat insulation facing the outside of a plate-shaped evaporator with good heat transfer in close contact, with one, at least the upper portion of the rear wall covering the middle evaporator section connect lateral evaporator sections which extend in the upper region of the side walls of the inner container outboard to the vicinity of the opening of the housing. The evaporator is formed from a coil whose turns are mounted on a heat-conducting support plate by clamping, Anschellen, soldering or the like. At the junctions of a central evaporator section to lateral sections, the support plate is interrupted by vertical slots which are bridged only by the tubes of the coil. In this way, the individual evaporator sections are particularly easy to turn and create close to the outside of the inner container.

The CN 201 145 455 Y shows a first evaporator with a U-shaped curved evaporator plate, which is provided with first evaporator pipe sections surrounding a freezer compartment. In addition, a second plate evaporator is shown, which is provided for cooling a separate from the freezer compartment cooling space, which is arranged completely below the first evaporator and which has a counter to gravity upwardly directed evaporator tube section.

The CN 201 145 455 Y discloses a household appliance according to the preamble of claim 1.

The object of the invention is a household refrigeration appliance with improved mountability, production quality and / or improved energy efficiency of Evaporator plates on the back surfaces of container walls to create a coolable by means of a refrigerant circuit system storage space for refrigerated goods.

The object of the invention is achieved by a household refrigerating appliance, comprising an inner container having at least one coolable storage space for refrigerated goods bounding container walls with rear surfaces, and a refrigerant cycle system with at least two evaporator plates whose front sides at different oriented back surfaces of the container walls and the backs are covered with at least one evaporator tube, wherein the at least one evaporator tube in the flow direction of a refrigerant flowing through the evaporator tube has a first evaporator tube section, which is laid along an adjacent to that container wall evaporator plate, which the ceiling of the storage room is assigned and has a first evaporator tube downstream in the flow direction second evaporator tube section, which is laid along an adjacent to that container wall evaporator plate, which is associated with the bottom of the storage room and the second evaporator tube downstream in the flow direction third evaporator tube section, which is aligned against gravity Having directional component and wherein the third evaporator tube section along a lying on the container wall ends evaporator plate is assigned, which is associated with a rear wall or a side wall of the storage room.

In all embodiments of the invention, the evaporator tube may have a fourth evaporator tube section, which is arranged in the flow direction between the first evaporator tube section and second evaporator tube section and which is laid along an adjacent to that container wall evaporator plate, which is associated with a side wall of the storage room.

In all embodiments according to the invention, alternatively, the evaporator tube may have a fourth evaporator tube section, which is arranged in the flow direction between the first evaporator tube section and the second evaporator tube section and which is laid along an evaporator plate adjoining the container wall, which is assigned to a rear wall of the storage space.

An exemplary embodiment of a profile of evaporator tube sections of an evaporator tube which extends over five evaporator plates will be described below.

First and foremost, the evaporator tube runs in the flow direction along an evaporator plate resting against that container wall, which forms the ceiling of the storage space. In this case, preferably a portion of the evaporator plate facing the door leaf is initially flown, and then a rear portion of the evaporator plate resting against the top wall of the storage space. Following this, the evaporator tube runs in the flow direction along an evaporator plate which adjoins the container wall and forms a first side wall of the storage space. Subsequently, the evaporator tube runs in the flow direction along an adjacent to that container wall evaporator plate, which forms a bottom wall of the storage room. Thereafter, the evaporator tube extends in the flow direction along an adjacent to that container wall evaporator plate, which forms a rear wall of the storage room. Along this rear wall, an evaporator tube section is arranged, which has a counter to the gravity directional component. Finally, the evaporator tube extends in the flow direction along an adjacent to that container wall evaporator plate, which forms a second remaining side wall of the storage room. In addition, after leaving the evaporator plates, which surround a freezer compartment, the evaporator tube can be guided in the flow direction to a further separate evaporator plate of a cold room. Finally, this can end the evaporator tube in the compressor.

On each evaporator plate, in particular on the evaporator plates, which occupy the top wall and / or the bottom wall, the evaporator tube can be arranged running meandering.

The described course of the evaporator tube can be adapted for devices with lower demand on the device energy consumption, for example by only the bottom wall, the ceiling wall and / or the rear wall are provided with evaporator plates and evaporator tube. Even in such an embodiment, the output of the evaporator, for example in the direction of the refrigerator compartment in refrigerated-freezer combination devices can be designed so that there is a pipe run on the rear wall, the one Overflow of refrigerant in the downtime of the compressor at least reduced or even prevented. An embodiment of an evaporator tube with overflow prevention has, for example, an on-side V-shape or U-shape at the upper end of which the outlet is from the freezer compartment of the associated evaporator. If refrigerant now arrives in this lying V-shaped evaporator tube section in the compressor standstill, gravity will counteract an overflow of refrigerant.

By dividing the evaporator plates into flexible individual boards, the adaptation to the refrigerated goods can be made much better than before. For example, Rohrablösungen resulting from relative movements of evaporator tube and evaporator plate during bending can be avoided so. The refrigerant-carrying evaporator pipe sections may have less pressure losses than comparable evaporators, such as conventional Rollbond evaporators. This allows the entire evaporator to be operated much more efficiently. By arranging the evaporator pipe sections siphons can be avoided and the noise during the compressor run time can be greatly reduced if necessary. In addition, the front side of the freezer compartment, which is adjacent to the door seal, are primarily cooled. From the procedural point of view, a multiplicity of different types of evaporators, in particular evaporator plate arrangement forms, can be produced simply and cost-effectively with simple bending and adhesive devices. This also provides an easy way to Kältefachabstimmung especially in single-circuit cooling systems.

In all embodiments of the invention, one evaporator plate may be connected to another evaporator plate by at least one web bridging a gap between a side edge of one evaporator plate and a side edge of the other evaporator plate along which a transition region such as an edge, corner and / or rounding two abutting back surfaces of two differently oriented container walls comes to rest in the installed position of the evaporator plates.

According to the invention evaporator, in particular combination evaporator can be prepared in which, for example, the freezer compartment of all five sides with Refrigerant leading evaporator tubes is acted upon. In a front, in particular closable by a door leaf opening for inserting and removing refrigerated goods, the five sides of the freezer compartment can be formed by a ceiling wall, a rear wall, a bottom wall and two side walls.

The evaporator plates according to the invention can be acted upon by a common evaporator tube, which can optionally be connected to an additional evaporator plate for a separate cooling compartment.

By means of the evaporator plates connected by webs, in particular a one-piece solution can be created which, in contrast to fully connected evaporator plate sections, reduces bending effort and / or bending along one edge of two adjoining back sides of adjacent side walls of the freezer compartment is made easier, in particular more flexible. Thus, especially when gluing the evaporator plates on the backs of the side walls of the inner container air pockets can be reduced, if not completely avoided. By avoiding trapped air, the cooling capacity can be improved on the inner container or in the storage spaces of the product.

By means of the evaporator plates connected by webs of assembly work can be reduced compared to a multi-part design with completely separate evaporator plates. By means of the evaporator plates connected by webs can be used instead of complex and in the production of expensive Rollbond evaporator plates with shallow channels, in particular evaporator plates with attached evaporator tubes.

Compared to known winding evaporators connected by webs invention evaporator plates have the advantage that depending on the version no Beauschlagung the rear wall of the inner container with a separate additional evaporator plate is necessary. Rather, an evaporator plate can be bent along the webs in the plane of the rear wall of the inner container.

In a compressor stall time, i. If the compressor of the refrigerant cycle system is not in operation and consequently the refrigerant is not conveyed through the compressor in the evaporator tube, for example, in refrigeration and freezing combination devices, the refrigerant from the evaporator tube associated with the freezer compartment can nevertheless flow into evaporator tube sections of an evaporator associated with the refrigeration compartment. This happens in particular when the same pressure has been set in the refrigerator compartment evaporator when the compressor is switched off as in the freezer compartment evaporator. This is also referred to as pressure equalization in the compressor stop time. After pressure equalization, there is typically a slow flow of refrigerant toward the compressor. Such a slow flow can be caused or at least intensified, for example due to absorption of refrigerant in the compressor oil or due to cooling of the compressor or its interior.

The embodiments according to the invention can be based in particular on tube plate evaporators. In this case, it is possible to use evaporator tubes or evaporator tube sections which are designed with a reduced number of tube bends. The evaporator plate blanks can be made in the manner of a cross from a flat sheet metal template. The evaporator tubes, or evaporator tube sections may be arranged so that the areas of the freezer compartment, in which the largest heat input consists, are primarily flowed with refrigerant. Coming from the bottom of the freezer compartment, one side of the evaporator can be provided with an ascending evaporator tube section on the flow side. This is useful to prevent the overflow of the refrigerant during the off time of the compressor in a lower lying refrigerator compartment. Furthermore, the individual plates, which are glued in particular on five sides of the freezer, be connected only with thin webs. Thus, the evaporator tubes can be bent with optimized to the tube diameter bending radii.

The evaporator plates can be individually adapted to the layers, orientations and / or orientations of the back sides of the container walls by suitably flexible formation of the webs. This allows the evaporator plates with their front sides over the entire surface, in particular air bubbles freely attached to the backs of the container walls, in particular glued.

By this procedure, a relative movement between the evaporator tubes, or evaporator tube sections and the evaporator plates can be avoided during bending, since there is no tube plate assembly in the bending area. This ensures a rich pipe system on the respective evaporator plates. In particular, evaporator tubes with inner diameters of about 6 mm can be used. The refrigerated compartment evaporators, on the other hand, can be manufactured separately as a separate evaporator in a special version.

The at least one web can have a higher flexibility than one or more evaporator pipe sections, which are guided over the gap bridged by the web from the one evaporator plate to the other evaporator plate.

In one embodiment, two adjacent evaporator plates can be connected to each other by two or three webs.

In another embodiment, the at least one web made of the material of the evaporator plates, in particular be formed integrally with the adjacent evaporator plates.

At least one evaporator plate which abuts against the rear surface of the ceiling wall of the storage room and at least one other evaporator plate which abuts against the back surface of the bottom wall of the storage room, can be connected by webs, in particular with the interposition of another evaporator plate, which at the rear surface of the rear wall the storage room rests, be connected.

In all embodiments according to the invention, the at least one evaporator tube can be guided along at least five evaporator plates, of which at least three, in particular four or five, evaporator plates are connected via webs according to the invention as described.

Further advantages of the invention will become apparent from the following description of an exemplary embodiment with reference to the accompanying Characters. Concrete features of this embodiment may, as an alternative or in combination with one another, represent general features of the invention.

Fig. 1

eine schematische Darstellung einer Anordnung von Verdampferplatten und einem Verdampferrohr mit Verdampferrohrabschnitten in einer ebenen, ungebogenen Form,

Fig. 2

eine perspektivische Ansicht einer Rückseite eines Innenbehälters eines Haushaltskältegeräts mit der Anordnung von Verdampferplatten und Verdampferrohrabschnitten gemäß Fig. 1 in einer an die rückseitigen Oberflächen der Behälterwände des Innenbehälters angepassten, gebogenen Raumform.

Show it:

Fig. 1

a schematic representation of an arrangement of evaporator plates and an evaporator tube with evaporator tube sections in a flat, unbent shape,

Fig. 2

a perspective view of a rear side of an inner container of a household refrigerator with the arrangement of evaporator plates and evaporator pipe sections according to Fig. 1 in an adapted to the rear surfaces of the container walls of the inner container, curved spatial form.

The Fig. 1 shows a section of an inner container 2 using the example of a household refrigerator 1. The inner container 2 has container walls 2a, 2b, 2c, 2d, 2e, which limit a coolable storage space 3 for refrigerated goods. In the illustrated embodiment, the storage room 3 is a freezer. The container walls 2a, 2b, 2c, 2d, 2e have back surfaces to which evaporator plates 5a, 5b, 5c, 5d, 5e of a refrigerant cycle system 4 arranged heat conductively, or fixed, in particular glued.

In the in Fig. 1 and Fig. 2 In the embodiment shown, the refrigerant cycle system 4 has five evaporator plates 5a, 5b, 5c, 5d, 5e to be adhered to the container walls 2a, 2b, 2c, 2d, 2e of the freezer compartment.

The evaporator plate 5c which abuts against the rear surface of the ceiling wall, that is, on the container wall 2c of the storage space 3, and the evaporator plate 5a which abuts against the back surface of the bottom wall, ie, the container wall 2a of the storage space 3 are in the illustrated embodiment by webs 6th connected. In addition, another evaporator plate 5e, which abuts against the rear surface of the rear wall, that is, against the container wall 2e of the storage space 3, is interposed, ie the evaporator plate 5e is connected via webs 6 both to the evaporator plate 5c and the evaporator plate 5a.

In each case, two adjacent evaporator plates, in the exemplary embodiment, therefore, the evaporator plate 5a and the evaporator plate 5e and the evaporator plate 5c and the evaporator plate 5e are connected to each other by three webs 6. The webs 6 are made of the material of the evaporator plates 5a, 5b, 5c, 5d, 5e, in particular integrally formed with the adjacent evaporator plates 5a, 5b, 5c, 5d, 5e.

The webs 6 bridge a gap 8 located between a side edge 7c of one evaporator plate 5c and a side edge 7e of the other evaporator plate 5e. The webs 6 also bridge a gap 8 lying between a side edge 7a of one evaporator plate 5a and a side edge 7e of the other evaporator plate 5e ,

Along the columns 8 come, as in Fig. 2 1, the transition regions 9 of two abutting surfaces of two differently oriented container walls 2a, 2b, 2c, 2d, 2e lying in the installation position of the evaporator plates 5a, 5b, 5c, 5d, 5e respectively. The transitional regions 9 can be formed, for example, at right angles or at least approximately at right angles to each other oriented, abutting surfaces of straight edges of a box-shaped or parallelepiped-shaped inner container 2 or storage space 3 or cooling space. These edges can have a rounded contour.

The webs 6 have a higher flexibility than one or more evaporator tubes 10, or evaporator tube sections 10a, 10b, 10c, 10d, 10e, which are bridged over the gaps 8 bridged by the webs 6 from the one evaporator plate 5a, 5b, 5c, 5d, 5e are led away to another evaporator plate 5a, 5b, 5c, 5d, 5e.

In the embodiment of Fig. 1 and Fig. 2 the evaporator tube sections 10a, 10b, 10c, 10d, 10e are formed by a continuous, one-piece evaporator tubes 10. The evaporator tube 10 faces in the flow direction of the refrigerant, as indicated by the arrows in FIG Fig. 1 indicated, a first evaporator tube section 10c, which is laid along a voltage applied to that container wall 2c evaporator plate 5c, which the Ceiling of the storage room 3 is assigned. Downstream of the first evaporator tube section 10c in the flow direction is a second evaporator tube section 10a, which is laid along an evaporator plate 5a adjacent to that container wall 2a, which is assigned to the floor of the storage room. A second evaporator tube section 10e connected downstream of the second evaporator tube section 10a in the flow direction has a direction component directed counter to the direction of gravity. The third evaporator tube section 10e is laid along an evaporator plate 5e adjacent to that container wall 2e, which is assigned a rear wall of the storage space 3.

The evaporator tube 10 also has a fourth evaporator tube section 10b which is arranged in the flow direction between the first evaporator tube section 10c and the second evaporator tube section 10a and which is laid along an evaporator plate 5b adjacent to that container wall 2b which is assigned to a side wall of the storage space 3.

The evaporator tubes 10 with the evaporator tube sections 10a, 10b, 10c, 10d, 10e can optionally have a separate evaporator 12 for a separate storage room 14, in particular a frost-free refrigerated compartment, with a separate evaporator plate 13, and a further evaporator tube 11 to be connected to the evaporator tubes 10 in the flow direction be connected subsequently.

Claims (9)

1. Domestic refrigerator, having an inner container (2), which has container walls (2a, 2b, 2c, 2d, 2e) with rear surfaces which delimit at least one coolable storage space (3, 14) for refrigerated goods, and a refrigerant circuit system (4) with at least two evaporator plates (5a, 5b, 5c, 5d, 5e), the front sides of which rest on differently oriented rear surfaces of the container walls (2a, 2b, 2c, 2d, 2e) and the rear sides of which are occupied with at least one evaporator tube (10), wherein in the flow direction of a refrigerant flowing through the evaporator tube (10) the at least one evaporator tube (10) has a first evaporator tube section (10c), which is placed along an evaporator plate (5c) resting on the container wall (2c), said evaporator plate being assigned to the ceiling of the storage space (3) and having a second evaporator tube section (10a) arranged downstream of the first evaporator tube section (10c) in the flow direction, which is placed along an evaporator plate (5a) which rests on the container wall (2a) and which is assigned to the base of the storage space (3) and has a third evaporator tube section (10e) arranged downstream of the second evaporator tube section (10a) in the flow direction, said third evaporator tube section having a directional component aligned counter to the force of gravity, characterised in that the third evaporator tube section (10e) is placed along an evaporator plate (5e) resting on the container wall (2e) and is assigned to a rear wall or a side wall of the storage space (3).
2. Domestic refrigerator according to claim 1, characterised in that the evaporator tube (10) has a fourth evaporator tube section (10b), which is arranged in the flow direction between the first evaporator tube section (10c) and the second evaporator tube section (10a) and is placed along an evaporator plate (5b) resting on the container wall (2b) and is assigned to a side wall of the storage space (3).
3. Domestic refrigerator according to claim 1, characterised in that the evaporator tube (10) has a fourth evaporator tube section (10b), which is arranged in the flow direction between the first evaporator tube section (10c) and the second evaporator tube section (10a) and is placed along an evaporator plate (5b) resting on the container wall (2b), said evaporator plate being assigned to a rear wall of the storage space (3).
4. Domestic refrigerator according to one of claims 1 to 3, characterised in that an evaporator plate (5a, 5b, 5c, 5d, 5e) is connected to another evaporator plate (5a, 5b, 5c, 5d, 5e) by means of at least one web (6), which bridges a gap (8) disposed between a side edge (7a, 7c, 7e) of the one evaporator plate (5a, 5b, 5c, 5d, 5e) and a side edge (7a, 7c, 7e) of the other evaporator plate (5a, 5b, 5c, 5d, 5e), along which a transition region, such as an edge, a corner and/or a curve of two abutting rear surfaces of two differently oriented container walls (2a, 2b, 2c, 2d, 2e) comes to rest in the installation position of the evaporator plates (5a, 5b, 5c, 5d, 5e).
5. Domestic appliance according to claim 4, characterised in that the at least one web (6) has a higher flexibility than one or a number of evaporator tube sections (10a, 10b, 10c, 10d, 10e) which are guided through the gap (8) from the one evaporator plate (5a, 5b, 5c, 5d, 5e) to the other evaporator plate (5a, 5b, 5c, 5d, 5e) which is bridged by the at least one web (6).
6. Domestic appliance according to claim 4 or 5, characterised in that two adjacent evaporator plates (5a, 5b, 5c, 5d, 5e) are connected to one another by two or three webs (6) in each case.
7. Domestic appliance according to one of claims 4 to 6, characterised in that the at least one web (6) is produced from the material of the evaporator plates (5a, 5b, 5c, 4d, 5e), in particular embodied in one piece with the adjacent evaporator plates (5a, 5b, 5c, 5d, 5e).
8. Domestic appliance according to one of claims 4 to 7, characterised in that at least one evaporator plate (5c) which rests on the rear surface of the ceiling wall of the storage space (3) and at least one other evaporator plate (5a), which rests on the rear surface of the base wall of the storage space (3), are connected by webs (6), in particular by inserting a further evaporator plate (5e), which rests on the rear surface of the rear wall of the storage space (3).
9. Domestic appliance according to one of claims 1 to 8, characterised in that the at least one evaporator tube (10) is guided along at least five evaporator plates (5a, 5b, 5c, 5d, 5e), of which at least three, in particular four or five evaporator plates (5a, 5b, 5c, 5d, 5e) are connected via webs (6) according to one of claims 6 to 10.

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