WO2008135434A2

WO2008135434A2 - Refrigerating appliance comprising a door air channel

Info

Publication number: WO2008135434A2
Application number: PCT/EP2008/055182
Authority: WO
Inventors: Thomas Bischofberger; Hans Ihle; Frank Placke; Matthias Stahl; Ulrich Van Pels
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH; Miele & Cie. Kg
Priority date: 2007-05-08
Filing date: 2008-04-28
Publication date: 2008-11-13
Also published as: DE102007021550A1; WO2008135434A3; EP2145138A2; CN101680700A; CN101680700B; RU2463533C2; RU2009142536A; EP2145138B1

Abstract

The invention relates to a refrigerating appliance comprising a body (2) containing at least one storage chamber (13, 23), a separate evaporator chamber (14), and a door (1). A first inlet (15) facing the door (1) is formed in a wall (12) of the evaporator chamber (14), and a first air channel (6) extending into the door (1) comprises an outlet (7) which is located opposite the first inlet (15) and separated therefrom by a gap (17). A flow guiding surface (2) extends from an edge of the first inlet (15) towards the door (1), and the first air channel (6) is designed in such a way as to expel an air flow oriented obliquely to the guiding surface (2).

Description

Refrigeration device with door air duct

The present invention relates to a refrigerator with a body in which at least one storage chamber and an evaporator chamber are partitioned, and a door, wherein in a wall of the evaporator chamber, a first inlet opening facing the door is formed and extending in the door first air duct on the first inlet opening opens. Such an air duct may be required, in particular, in refrigeration appliances with forced circulation in order to ensure a satisfactory exchange of air between the evaporator chamber and all storage chambers or all areas of a storage chamber.

In order to ensure a low-loss transition of the air from the air duct of the door to the inlet opening, conventionally, an outlet opening of the air duct with the door closed is placed directly opposite the inlet opening and close and substantially close to this.

In such a refrigeration device, there is the problem that the position of the closed door with respect to the body may vary by manufacturing tolerances and may also change during operation of a refrigerator, for example, due to changing loading of the door, fluctuating temperatures or the like. If the outlet opening of the air duct is not exactly opposite the inlet opening due to such displacements, a pressure drop occurs at the transition and the air flow rate decreases. When the air flow is driven by a fan, the fan power required to maintain a desired air flow increases and pollutes the energy balance of the refrigerator. In addition, the pressure drop promotes the escape of air at leaks of the transition between the air duct and the inlet opening or the inflow of external air. In refrigerators with multiple storage chambers, this may affect the thermal separation of the individual storage chambers, as will become more apparent below.

Object of the present invention is to provide a refrigeration device of the type specified, the simple means a low-loss, against any shifts ensures tolerant passage of air from the first air passage into the first inlet opening between the door and the body of the refrigerator.

The object is achieved in that in a refrigerator with a body in which at least one storage chamber and an evaporator chamber are divided, and a door, wherein in a wall of the evaporator chamber, a door facing the first inlet opening is formed and extending in the door first air passage has an outlet opening which is the first inlet opening separated by a gap, a flow guide from an edge of the first inlet opening tapers to the door and the air duct is formed to eject an obliquely directed against the guide surface airflow. It turns out that such an air flow, probably due to the Coanda effect, largely lossless and without swirling with dormant air of the gap to a significant extent, is able to flow along this guide surface along. Since, when the air circulates in the interior of the refrigerator in a closed path, the air flow rate of the inlet opening can not be smaller than that of the air duct, the air flow discharged from the air duct is substantially completely absorbed by the inlet opening.

In order to ensure that despite tolerances of the door position, the flow of the air duct securely meets the first inlet opening, this expediently has larger dimensions than the outlet opening. When the air flow from the air channel fully utilizes the capacity of the first inlet port, practically no air flows through non-flow areas of the first inlet port of the evaporator chamber.

In order to further promote this effect, a guide plate parallel to the flow guide surface is preferably arranged in the first inlet opening.

The flow guide is preferably part of a ceiling of the body.

According to a preferred embodiment, the first inlet opening opens onto a second air channel extending in the wall between a second inlet opening open to the bearing chamber and the evaporator chamber. An air flow in this channel, which may be driven by a blower, for example, to convey cold air from the evaporator chamber into the storage chambers, generates at the location of the first inlet opening after the Bernoulli law, a negative pressure, so that the emerging from the first air duct in the door air is efficiently sucked into the second air duct.

In order to enhance this suction effect, it is also expedient for the second air channel to be curved at the level of the first inlet opening and for the first inlet opening to open on a convex side of the second air channel. If the air circuit passing through the first air passage is interrupted and no air from the first air passage into the first inlet port, a flowing between the second inlet opening of the evaporator chamber air flow can follow the course of the second air duct by Coanda effect loss.

In order to efficiently align an air flow issuing from the first air duct of the door onto the first inlet opening, at least one curved deflecting plate is preferably provided in an outlet opening of the first air duct opposite the first inlet opening.

The above-defined invention is particularly advantageously applicable to a refrigerator whose body has a first storage chamber adjacent to the evaporator chamber and a second storage chamber remote from the evaporator chamber, and the first air duct in the door leads from the second storage chamber past the first storage chamber to the evaporator chamber.

Further features and advantages of the invention will become apparent from the following description of embodiments with reference to the accompanying figures. Show it:

Fig. 1 shows a schematic section through a front upper corner portion of a refrigerator according to the present invention;

FIG. 2 shows a schematic complete section through the refrigeration device of FIG. 1; FIG. and

Fig. 3 is an analogous to Fig. 1 section according to a second embodiment of the present invention. Fig. 1 shows in section the upper edge region of a refrigerator door 1 and the front edge of a ceiling 2 of the refrigerator body.

The door 1 has in a conventional manner an outer wall 3 made of sheet metal, an inner wall 4 made of plastic and an enclosed between the walls filling 5 of insulating foam material. An air duct 6 extends in the door 1 between the inner wall 4 and the filling 5 of an inlet opening, not shown, at the level of a lower of two storage chambers of the refrigerator to an outlet opening 7 at an upper edge of the door. The air channel 6 is formed on the majority of its length by an extrusion profile 8; on the upper end of the extrusion profile 8, an injection-molded Umlenkstutzen 9 is attached. An upper end of the Umlenkstutzens 9 extends through an opening of the inner wall 4 and is latched to an externally plugged mask 10. The insulation material filling 5 facing wall of the Umlenkstutzens 9 is curved in the upper quarter of a quarter circle; concentric with this curvature, a baffle plate 11 extends over the entire width of the outlet opening 7. By this design of the Umlenkstutzens 9 exiting the air duct 6 receives air impulse in the depth direction of the refrigerator, but without losing their momentum in the upward direction completely. The result is an obliquely upward directed against the ceiling 2 and along this stroking air flow 27th

From the ceiling 2 of the refrigerator body, a partition wall 12 is suspended, which divides the interior of the body in an upper storage chamber 13 and an evaporator chamber 14. The partition wall 12 has two inlet openings, a first inlet opening 15, which is separated from the outlet opening 7 by a communicating with the upper storage chamber 13 gap 17 and immediately adjacent to the ceiling 2, and a second inlet opening 16, which opens directly to the upper storage chamber 13 , Behind the dividing wall 12, a second air duct 18 extends from the second inlet opening 16 initially obliquely forward and upwards in the direction of the first inlet opening 15 to bend backwards in the amount of this and to open the evaporator chamber 14.

As shown in FIG. 2, at the rear end of the evaporator chamber 14, a fan 19 is mounted, which drives the air flow through the evaporator chamber 14. A stream downwardly from the fan 19 arranged valve flap 20 distributes the air flow of the fan to opening directly into the upper storage chamber 13 outlet openings 21 and a within the rear wall 22 of the body down to the second storage chamber 23 extending channel 24th

As long as the valve flap 20 blocks the supply of cold air to the lower storage chamber 23, no air exits at the outlet opening 7, and air sucked in via the inlet openings 15, 16 directly via the gap 17 originates from the upper storage chamber 13. If only the lower storage chamber The air flow emerging from the air duct 6 at the outlet opening 7 impinges obliquely on the ceiling 2, passes laminarly and without fanning along the latter and therefore strikes the first one essentially unattenuated Inlet Opening 15. Since the airflow fully utilizes the capacity of the evaporator chamber, no further air from the upper storage chamber 13 is drawn into the evaporator chamber 14, and the air circulates, thermally separated from the storage chamber 13, only between the evaporator chamber 14 and the lower storage chamber 23 ,

When the flap 20 assumes an intermediate position in which both chambers 13, 23 are supplied with cold air from the evaporator 25, then air flows over the entire length of the second air channel 18, from the inlet opening 16 to the evaporator chamber 14. This flow creates a negative pressure at the level of the inlet opening 15, so that is sucked through this air into the channel 18. This suction causes the air ejected from the outlet port 7 to be completely sucked even when the outlet port 7 is not perfectly aligned with the inlet port 15 and is not dispersed in the upper bearing chamber 13. Thus, an inflow of air from the air duct 6 in the upper storage chamber 13 is also excluded if both storage chambers are simultaneously acted upon with cold air from the evaporator chamber 14.

Fig. 3 shows a simplified modification of the refrigerator according to the invention in a similar to Fig. 1 section. Elements of this embodiment, which correspond to those of the first embodiment, are designated by the same reference numerals and are only explained insofar as this is necessary for understanding the differences between the embodiments. In the embodiment of FIG. 3, the evaporator chamber 14 has only a single inlet opening 15, which lies opposite the outlet opening 7. In the inlet opening arranged horizontal guide plates 26 favor the influx of air to the evaporator chamber 14 in the horizontal direction to ensure that when air circulates only between the evaporator chamber 14 and the lower storage chamber 23, which is completely sucked from the outlet opening 7 air flow, from below However, air coming from the storage chamber 13 is prevented. When air circulates through both storage chambers 13, 23, an upwardly directed flow arises in the gap 17, which additionally forces the stream coming from the air duct 6 against the ceiling 2. Thus, no air can escape from this stream via the gap 17 in the upper storage chamber 13.

Claims

claims

1. Refrigerating appliance with a body (2) in which at least one storage chamber (13, 23) and an evaporator chamber (14) are divided, and a door (1), wherein in a wall (12) of the evaporator chamber (14) one of Door (1) facing first

Inlet opening (15) is formed and in the door (1) extending first air duct (6) has an outlet opening (7) which is the first inlet opening (15) separated by a gap (17), characterized in that a Flow guide surface (2) from an edge of the first inlet opening (15) out of the door and that the first air duct (6) is shaped to eject an obliquely directed against the flow guide surface (2) air flow.

2. Refrigerating appliance according to claim 1, characterized in that the first inlet opening (15) has larger dimensions than the outlet opening (7).

3. Refrigerating appliance according to claim 1 or 2, characterized in that the flow guide is part of a ceiling of the body (2).

4. Refrigerating appliance according to one of the preceding claims, characterized in that in the first inlet opening to the

Flow guide parallel guide plate is arranged.

5. Refrigerating appliance according to one of the preceding claims, characterized in that the first inlet opening (15) on a in the wall (12) between a storage chamber (13) open the second inlet port (16) and the evaporator chamber (14) extending second air duct (18) opens.

6. Refrigerating appliance according to claim 5, characterized in that the second air channel (18) at the level of the first inlet opening (15) is curved and the first inlet opening (15) opens on a convex side of the second air channel (18).

7. Refrigerating appliance according to one of the preceding claims, characterized in that at least one curved deflecting plate (11) of the first inlet opening (15) opposite outlet opening (7) of the first air channel (6) intersects.

8. Refrigerating appliance according to one of the preceding claims, characterized in that the body (2) one of the evaporator chamber (14) adjacent the first storage chamber (13) and one of the evaporator chamber (14) remote second storage chamber (23) and that the first air duct (6) from the second storage chamber (23) on the first storage chamber (13) over to the evaporator chamber (14) leads.