WO2013013969A2

WO2013013969A2 - Refrigerator, in particular domestic refrigerator

Info

Publication number: WO2013013969A2
Application number: PCT/EP2012/063491
Authority: WO
Inventors: Walter Angelis; Frank Cifrodelli; Ralph Krause; Niels Liengaard; Sebastian Rau
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2011-07-25
Filing date: 2012-07-10
Publication date: 2013-01-31
Also published as: WO2013013969A3; DE102011079761A1

Abstract

The invention relates to a refrigerator, in particular a domestic refrigerator, having a cooling chamber (1) and a cold-air duct (13) which is separated from the cooling chamber (1) and in which air (II) which is flowing through can be cooled down by means of an evaporator (9) and which forms a flow connection with the cooling chamber (1) by means of an air inlet (17) and an air outlet (21). According to the invention, the evaporator (9) forms a partition wall which separates the cooling chamber (1) from the cold-air duct (13).

Description

Refrigerating appliance, in particular household refrigerating appliance

The invention relates to a refrigerator, in particular a household refrigerator, according to the preamble of claim 1. Usually, the evaporator of a refrigerator behind the cold room rear wall foamed in Wärmeisolierschaum. In addition, a fan can be provided on the cold room ceiling in the cold room in order to reduce by air circulation, the refrigerator compartment temperature especially in the upper part of the refrigerator. Alternatively, refrigerators are also known in which the evaporator is provided free-hanging in the refrigerator, whereby the evaporator on both sides directly in contact with the cooling space to be cooled air can be brought.

EP 0 793 066 B1 discloses a generic refrigerating appliance with such a freely suspended evaporator. The refrigerator has one from the refrigerator

separated cold air duct, in which the air flowing through is cooled by means of the evaporator. The cold air duct is fluidically connected to the cooling space via an air inlet and an air outlet. At the air inlet, a fan is arranged, with which the cooling chamber air in forced convection flows through the cold air duct and is returned from the air outlet into the cooling space.

In EP 0 793 066 B1, the cold air duct is defined between a rear wall of the inner container delimiting the cooling space and a dividing wall. The free-hanging

Evaporator is held approximately in the middle between the rear wall and the partition wall and is thus surrounded on both sides by air. The fan is arranged at the air inlet of the cold air duct, which is located above the evaporator. Due to the arrangement of the fan above the evaporator results on the pressure side, a particularly long flow path for the cold air flow, which also flows around the free-hanging evaporator. This has a comparatively large pressure and speed loss result, by a correspondingly high

Power consumption of the fan must be compensated. In addition, there is the problem with very large evaporators that the air flowing through the cold air duct has already cooled very strongly in the area in front of the air outlet. Thus, the missing Efficiency reasons required driving temperature difference, whereby in the area before the air outlet, the efficiency in the heat transfer from the air flow into the evaporator is very low.

From DE 601 17 808 T2 a further refrigeration device is known in which the evaporator is a special, elongated finned evaporator. The fan sucks on one side of the finned evaporator and blows out an air flow on the other side. The back wall of the refrigerator is largely made of a multipart

Covered plastic cover, which is used as an air duct. Also by the

Plastic cover and the special finned evaporator results in a very costly cold air guide.

The object of the invention is a refrigeration device, in particular

Household refrigeration appliance to provide, in which the energy efficiency of the refrigerator can be increased in a simple manner.

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 or a wine storage cabinet.

The object is solved by the features of claim 1. preferred

Further developments of the invention are disclosed in the subclaims.

According to the invention, a refrigerator is proposed which has a cooling space and a cold air channel separated therefrom. In the cold air duct, the air flowing through is cooled by means of an evaporator. The cold air duct is fluidically connected to the cooling space via an air inlet and an air outlet. According to the characterizing part of claim 1 is in terms of a

Component reduction on an additional partition wall for the separation of the cold air duct omitted from the refrigerator. Rather, the evaporator forms a partition that separates the cold room from the cold air duct. According to the invention therefore serves the evaporator in Dual function not only for cooling the air flow guided through the cold air duct, but also for separating the cold air duct from the cold room. At the same time thereby the cold air duct can be provided largely without flow obstacles. The air flow through the cold air duct can therefore take place in comparison to the prior art with greatly reduced pressure and speed loss.

With a sufficiently large channel width, the air flow in natural convection can flow through the cold air duct and thereby be cooled by the evaporator. However, especially with a narrow cold air duct (evaporator rear side) only a reduced natural air convection is possible. To increase the cooling capacity, therefore, a fan can be used in addition, with which the cold air duct with cold air in

Forced convection is flowed through. In this case, in particular a radial fan is advantageous in which the air is sucked in axially and is blown out radially. Such radial fans can also without flow housing, that is, only with a fan, be installed, whereby the required space is greatly reduced.

The fan suction side is associated with a suction through which the cooling space air is sucked. The sucked cold room air is then along a

Cold air duct route led to the air outlet and ejected there in the cold room. A reduction of the cold air duct section is in view of lower pressure and

Speed losses of advantage. Against this background, the air inlet with its intake opening can not be arranged at the edge above or laterally of the evaporator, but approximately centrally within the evaporator. That way is the

Air intake directly in the evaporator, that is closed circumferentially from

Evaporator limited. The cold air ducts to an upper and lower air outlet can thereby be approximately halved. Preferably, the suction opening is provided with the fan approximately in the vertical direction in the middle in the evaporator, whereby the

Cold air ducts are up and down substantially the same size. To further increase energy efficiency, it is advantageous if not only the

Cold air duct is flowed through, but in addition, a flow proportion of the cold air flow along the refrigerator facing the front side of the evaporator is guided. For this purpose, a flow divider may be provided, which sucked the Cold air flow into a flowing through the cold air duct main flow and a partial flow divides. This can be parallel with the help of special guide elements

Main flow and along the refrigerator facing evaporator front be performed. The above-mentioned flow divider can be a component-consuming way a separate

Be flow element. However, it is preferred if the flow divider for dividing the cold air flow into the main flow and into the partial flow is formed directly through the opening edge of the suction opening in the evaporator. For this purpose, the

Centrifugal fan with its fan with a first excess beyond the evaporator front and protrude with a second oversize in the rear cold air duct. Depending on the magnitude of the first and second oversize thus results in a back-side main flow in the cold air duct and a front-side partial flow along the evaporator front. The cold air duct can be formed in a simple manner between the evaporator rear side and a cooling space delimiting wall of the inner space defining the cooling space, in particular a rear wall. At the top and bottom edges of the

Evaporator can be provided in each case air outlets through which the cold air is blown into the refrigerator.

The partial flow flowing along the evaporator front side can flow along an annular gap which is defined by the evaporator front side and an upstream cover plate. The annular gap can be designed to be open to the outside. In addition, the cover plate may have an intake opening, which is arranged in alignment with the air inlet of the evaporator. Preferably, the flow cross-section of

Suction opening of the cover plate smaller than the flow cross-section of the

evaporator-side air inlet, so that the cover plate covers the intake opening or the fan end side inwardly with a Versatzmaß. This allows the airflow drawn through the flow passage of the cover plate

be fluidically decoupled from the pressure side, guided through the annular gap to the outside partial flow. The cover plate can also carry a screen that prevents access to the impeller of the fan as engagement protection. The screen can cover the Stromungsdurchlass the cover plate front to form inlet openings.

The evaporator is preferably an at least two-layer laminated sheet metal composite, which can almost completely cover, for example, the rear wall of the cooling space. In the laminated blanks composite, the cold air duct air inlet and / or the

Be incorporated with coolant lines. Preferably, the laminated blanks composite consist of two aluminum plates, such as a high-strength motherboard and a cover plate with reduced material thickness. On the motherboard can be applied by means of graphite a predetermined channel image. Subsequently, the cover plate can be welded by a rolling process with the motherboard. To form the

Coolant channels can then be inflated the sheet metal blanks composite with high pressure. In the central area of the laminated sheet composite, the basic and

Cover boards to be welded together over a large area. The middle area can then be punched out of a recess which can be used as a suction opening for the fan.

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:

Figure 1 is a schematic side sectional view of a refrigerator. FIG. 2 shows a detail view of the intake area of the ventilator from FIG. 1; FIG. and Fig. 3 in a perspective view of the cold air duct air inlet in

Evaporator.

In Fig. 1 a refrigeration device is shown with a cooling space 1, the front-side charging opening is closed by a door 3 in a side sectional view. The refrigerator 1 is limited by a plastic inner container 2, which together with not shown housing outer walls in a conventional manner with a

Thermal insulation foam filled intermediate space limited. On the rear wall 7 of the

Inner container 2, an evaporator 9 is arranged. This is positioned freely suspended in the cooling chamber 1, that is not foamed in the heat insulating foam, but upstream in the Bautiefenrichtung y the rear wall 7. The evaporator 9 is part of a refrigerant circuit, not shown in FIG. 2, the compressor is arranged, for example, in a machine room in the rear lower corner of the refrigerator. The evaporator 9 is spaced from the rear wall 7 of the inner container 2 to form a cold air duct 13. The cold air duct 13 has an air inlet 17, which is incorporated in the vertical direction z approximately centrally in the evaporator 9, as will be described in more detail later.

The upper and lower edges 18, 19 of the evaporator 9 do not encounter directly on

Inner container 2, but rather to form slit-shaped

Air outlets 21 spaced therefrom. In the evaporator-side air inlet 17, a fan 23 of a centrifugal fan 15 is rotatably arranged as shown in FIGS. 1 and 2. With the fan 23, an air flow I is sucked in from the cooling space 1 approximately in the middle and in the depth direction y, and these are conveyed radially outwards through the cold air duct 13 to the two air outlets 21. The cold air ducts a, b between the fan 23 and the two upper and lower air outlets 21 are substantially identical.

According to the figures, the evaporator rear side delimits the cold air duct 13, while the evaporator front side 27 faces the cooling chamber 1. The evaporator 9 thus forms a partition which separates the cooling chamber 1 from the cold air duct 13.

2, the intake of the fan 15 is shown in detail. As a result, the fan 23 of the radial fan 15 penetrates the air inlet 17 of the evaporator 9. The fan 23 thus dominates the evaporator front side 27 with a supernatant c. In addition, the fan 23 protrudes in the axial direction with a supernatant d in the

Cold air duct 13 in, while leaving a slight annular gap 29 between the opening edge 20 of the air inlet 17 and the outer periphery of the

Fan wheel 23. The opening edge 20 of the air inlet 17 acts in FIGS. 1 and 2 as a flow divider, which divides the sucked air flow I into a main flow II and a partial flow III.

The front end of the fan 23 is preceded by a cover 31, which has a central intake opening 33. The suction port 33 is in the

Bautiefenrichtung aligned in alignment with the fan 23 and the air inlet 17. The flow cross-section of the intake opening 33 is substantially smaller than the flow cross-section of the air inlet 17. Accordingly covers the cover 31, the fan 23 front side radially inwardly by a Versatzmaß e. In the further course in the depth direction y forward is a screen 35 is provided, which is spaced from the cover plate 31 via edge webs with intermediate Einströmspalten 37 (FIG. About the Einströmspalte 37, the air flow I is passed to the pressure side of the fan 23. The impeller 23 displaces the sucked cold air radially outwards, to form a guided in the cold air duct 13 main flow I and a flow in a gap 39 (FIG. 2) partial flow II. The flow gap 39 is through the evaporator front side 27 and the upstream Cover plate 31 defined. The

Main flow II is guided according to FIGS. 1 and 2 via the cold air duct sections a, b to the air outlets 21 and blown out there into the cooling space 1. The partial flow III is first led in the flow gap 39 parallel to the main flow II radially outward along the evaporator front side 27 into the cooling chamber 1 and then opens into the central region of the cooling chamber 1 a.

In Fig. 3 is shown in an enlarged partial view of the central portion 45 of the evaporator 9, in which the air inlet 17 is incorporated. The evaporator 9 is formed by two stacked sheet metal plates 41, 43, which are welded together in a roll-bonding method known per se. In the middle section 45 of the evaporator 9, the two sheet metal blanks 41, 43 are welded over a large area and continuously with each other. The air inlet 17 is incorporated by a punching process as a sheet-metal recess in the sheet-metal composite. Laterally outside the middle section 45 of the evaporator 9, the refrigerant pipes are incorporated, of which in Fig. 3, only a refrigerant line 46 is shown.

LIST OF REFERENCE NUMBERS

1 refrigerator

2 plastic inner containers

3 appliance door

7 rear wall

9 evaporator

11 engine room

13 cold air duct

15 fans

17 air intake

18, 19 upper and lower edges of the evaporator 9

20 opening edge of the air inlet

21 air outlets

23 fan wheel

27 evaporator front

29 annular gap

31 cover plate

33 intake opening

35 screen

37 inflow openings

39 flow gap

41, 43 sheet metal blanks

45 middle section

46 Refrigerant line

I, II, III air currents

a, b Cold air duct sections

c, d supernatant

e offset

Claims

Refrigerating appliance, in particular household refrigerating appliance, with a cooling space (1) and a cold air duct (13) separated from the cooling space (1), in which air flowing through (II) can be cooled by means of an evaporator (9) and via an air inlet (17) and an air outlet (21) is fluidically connected to the cooling space (1), characterized in that the evaporator (9) forms a partition which separates the cooling space (1) from the cold air passage (13).

Refrigeration appliance according to claim 1, characterized in that a fan (15), in particular a radial fan, is provided, with which the cold air duct (13) can be flowed through with forced convection in cold air duct, and in particular the fan (15) in the air inlet (17) of Cold air duct (13) is positioned.

Refrigerating appliance according to claim 1 or 2, characterized in that the air inlet (17) of the cold air duct (13) from the evaporator (9) is closed peripherally closed and / or via a cold air duct path (a, b) from the air outlet (21) is spaced, and in particular that the cold air duct sections (a, b) are essentially the same size.

Refrigerating appliance according to one of the preceding claims, characterized in that a flow divider is provided which a sucked cold air flow (I) into a through the cold air duct (13) flowing main flow (II) and a

Partial flow (III) divides, which is parallel to the main flow (II) along a the cooling chamber (1) facing the front side (27) of the evaporator (9).

Refrigerating appliance according to one of claims 2, 3 or 4, characterized in that the fan (15) with its fan wheel (23) with a projection (c) the front side (27) of the evaporator (9) surmounted and with a supernatant (d) protrudes into the cold air duct (13).

6. Refrigerating appliance according to claim 4 or 5, characterized in that the

Distribution of the sucked cold air flow (I) into the main flow (II) and in the partial flow (III) provided flow divider through the opening edge of the

Air inlet (17) in the evaporator (9) is formed.

7. Refrigerating appliance according to one of the preceding claims, characterized in that the cold air duct (13) between the evaporator (9) and a cooling space boundary wall (7), in particular a rear wall of the inner container of the refrigerator.

8. Refrigerating appliance according to one of claims 4 to 7, characterized in that the partial flow (III) between the front side (27) of the evaporator (9) and an upstream cover plate (31) is defined, which has a radially outwardly open flow gap (39 ) limit.

9. Refrigerating appliance according to claim 8, characterized in that the cover plate (31) has a suction opening (33) which covers the fan end face or the air inlet (17) radially inwardly with an offset dimension (e).

10. Refrigerating appliance according to claim 9, characterized in that the suction opening (33) with the formation of inflow openings (37) with a screen (35) is covered on the front side.

1 1. Refrigerating appliance according to one of the preceding claims, characterized in that the evaporator (9) is an at least two-layer sheet-metal composite (41, 43), in which the air inlet (17) and / or coolant lines are incorporated.