DE102017216943A1 - Refrigerating appliance with storage chamber and evaporator chamber - Google Patents

Abstract

In a refrigerator with at least one storage chamber (13), an evaporator chamber (11) and a at a passage (21) between the storage chamber (13) and the evaporator chamber (11) arranged, a rotation axis (23) having a fan (22) and one in the Evaporator chamber (11) arranged evaporator (1) extend arcuate refrigerant lines (2) of the evaporator (1) about the axis of rotation (23).

Description

The present invention relates to a refrigerator with a storage chamber and a remote from the storage chamber evaporator chamber. In such refrigerators, a fan is usually mounted on a passage between the storage chamber and the evaporator chamber to drive the exchange of air between the chambers. The evaporator is usually a roughly parallelepipedal vane evaporator with lamellae which are parallel to one another and guide the flow of air through the lamella evaporator from one narrow side of the cuboid to the other.

The dimensions of the passage are generally much smaller than the length of the upstream and downstream narrow sides. This has the consequence that some parts of the evaporator are aerodynamically favorable in relation to the passage and are accordingly flowed through more than other parts. The strong flow in the aerodynamically favored parts causes the air to cool down less there than in the less favored parts. The existence of different tempered air streams, which mix after passage through the evaporator, affects the efficiency of the evaporator.

The differences in the flow through various parts of the evaporator are all the more conspicuous the closer the passage is to the next adjacent upstream or downstream narrow side of the evaporator. Accordingly, while it would be possible to reduce the differences in flow by making the distance between the evaporator and the passage large, this also results in a large volume of the evaporator chamber, thus losing usable volume of the storage chamber given external dimensions of the refrigerator.

The object of the invention is to provide a refrigerator in which a uniform flow of the evaporator can be achieved over its entire cross section in a compact evaporator chamber.

The object is achieved by extending in a refrigerator with at least one storage chamber, an evaporator chamber and arranged at a passage between the storage chamber and evaporator chamber, having a rotation axis fan and an evaporator arranged in the evaporator chamber arcuate refrigerant lines of the evaporator extend around the axis of rotation. Such orientation of the refrigerant piping allows the air in the evaporator chamber to flow radially from the passageway or toward it while crossing the refrigerant piping under steady state conditions over the length of their bends, so that air flow and cooling of the air in each part of the cross section of the evaporator are approximately equal.

The arches may be arcs on at least part of their length, at the center of which is the axis of rotation.

The evaporator may have lamellae in a manner known per se in order to increase the surface available for the heat exchange. These fins should protrude from the refrigerant lines in the radial direction to guide the air in the radial direction away from or towards the passage.

According to a first embodiment, the fins may comprise at least one plate extending helically around one of the refrigerant lines. Such a plate may have a contiuous edge on its edge facing away from the refrigerant line edge; then the edge facing the refrigerant line is typically folded accordion-like, so that it can be fastened to the refrigerant line over its entire length. Alternatively, the plate may be slotted on its edge remote from the refrigerant line to form a plurality of tongues between the slots which, when the plate is attached to the refrigerant line, protrude radially from the refrigerant line in different directions.

According to a second embodiment, two refrigerant pipes spaced along the rotation axis are connected via the fins. Thus, a stiffer, dimensionally stable evaporator block can be formed.

In a conventional cuboidal finned evaporator, refrigerant lines extending transversely to the direction of flow are arranged not only in the direction of flow, but also transversely thereto in different positions. Accordingly, there is also in the evaporator according to the invention in the transverse flow direction, i. radial to the axis of rotation, spaced refrigerant lines. These can, without impeding the flow, in a common multi-chamber tube, in particular a microchannel multi-chamber tube run

In order to supply in a refrigerator air, which has passed through various inlet passages into the evaporator chamber, through the evaporator to the arcuately surrounded by the refrigerant lines outlet passage or, conversely, air, which has passed through the arcuately surrounded by the refrigerant lines entrance passage into the evaporator chamber, spaced from each other Should distribute outlets the refrigerant pipes extend around the axis of rotation through an angle of at least 90 °.

For manufacturing reasons, it is preferred if the angle over which the refrigerant lines extend around the axis of rotation does not exceed 180 °. Should it be necessary to surround the axis of rotation at an angle greater than 180 ° with an evaporator, this can be formed by a plurality of evaporator blocks.

In a domestic refrigerator, the storage chamber and the evaporator chamber are generally housed in a common housing. The storage chamber can here adjoin a door of the housing, while the evaporator chamber is adjacent to a door opposite the rear wall of the housing. The passage is then typically in a partition wall parallel to the rear wall between the evaporator and storage chamber.

Air ducts needed in addition to the passage to form a closed air circuit between the storage and evaporator chambers may extend on sidewalls of the housing from a front end facing the door to the evaporator chamber to extend in the storage chamber substantially in the depth direction Storage chamber evenly flushing air flow to produce and ensure sufficient cooling in the storage compartment, especially near the door.

In particular, such a construction allows uniform cooling of an extraction box located between the side walls and their air ducts, whether by passing the air between the front ends of the air ducts and the passage at the rear of the storage chamber through the drawer itself or between side walls of the drawer and the side walls of the housing each having a gap is provided in which the air between said front ends of the air ducts and the passage can circulate.

To form the air channels and the evaporator chamber, an inner liner may be inserted into the housing, the passage being formed in a rear panel of the inner liner extending between the chambers, and the inner panel further comprising side walls extending between the air channels and the storage compartment ,

• 1 eine perspektivische Ansicht eines erfindungsgemäßen Verdampfers;
• 2 Querschnitte eines in dem Verdampfer verwendbaren Microchannel-Rohrs;
• 3 einen Querschnitt durch das Gehäuse eines Kältegeräts mit einem Verdampfer gemäß einer ersten Ausgestaltung der Erfindung;
• 4 einen Schnitt in Tiefenrichtung durch das Kältegerätegehäuse der 3;
• 5 einen Querschnitt durch das Kältegerätegehäuse entlang der Ebene V-V aus 4;
• 6 einen zu 3 analogen Querschnitt gemäß einer zweiten Ausgestaltung der Erfindung; und
• 7 einen zu 3 analogen Querschnitt gemäß einer dritten Ausgestaltung der Erfindung.

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

• 1 a perspective view of an evaporator according to the invention;
• 2 Cross sections of a usable in the evaporator Microchannel tube;
• 3 a cross section through the housing of a refrigerator with an evaporator according to a first embodiment of the invention;
• 4 a section in the depth direction through the refrigerator housing the 3 ;
• 5 a cross section through the refrigerator housing along the plane VV 4 ;
• 6 one too 3 analog cross section according to a second embodiment of the invention; and
• 7 one too 3 analog cross-section according to a third embodiment of the invention.

1 shows a perspective view of an evaporator 1 which can be used in a refrigerator according to the present invention. The evaporator 1 includes several curved refrigerant pipes 2 , of which in each case several side by side in a piece multi-chamber tube, in particular a microchannel tube 3 Made of aluminum, run. The axis of curvature 4 is for all curved refrigerant pipes 2 or microchannel tubes 3 the same and is perpendicular to the broad sides of the microchannel tubes 3 , The microchannel tubes 3 are in the direction of the axis of curvature 4 offset against each other and one below the other over bows 5 connected, each to a radial axis of curvature 4 extending axis 6 are centered.

At two free ends of the microchannel tubes 3 are radial distributors in the radial direction 7 Soldered in the microchannel tubes 3 side by side running refrigerant pipes 2 connect in parallel and supply with refrigerant. The pipes 3 are also interconnected by lamellae 8th extending in the direction of the axis of curvature 4 and extending radially therefrom and each having two opposing, radially extending edges 9 have on the broad sides of the microchannel tubes 3 are soldered.

The slats 8th typically exist like the pipes 3 made of aluminium; They can at least at their edges 9 be provided with a solder layer which melts lower than the aluminum, so that the soldering can be done by the finished shaped microchannel tubes 3 along with the slats placed between them 8th be heated in an oven to the melting temperature of the solder.

2 shows possible cross sections of the microchannel tubes 3 , As can be seen in the left half of the figure, numerous refrigerant lines can 2 of equal, compact cross section side by side along the microchannel tube 3 extend. In order to increase the surface usable for the heat exchange, can on the insides of the refrigerant pipes 2 as in the middle and in the right part of 2 shown in the free cross section of the refrigerant pipes 2 protruding ribs 10 be shaped.

3 shows a partial section through the housing of a refrigerator according to the invention along a vertical and in the width direction of the housing through the evaporator chamber 11 extending, in 4 With III-III designated level. The housing comprises an inner container 12 that the evaporator chamber 11 and a storage room 13 (S. 4 ), as well as the inner container 12 surrounding insulation layer 14 , The evaporator 1 is in the evaporator chamber 11 to be seen in plan view. Behind the evaporator 1 extends parallel to the cutting plane a backplane 15 between the evaporator chamber 11 and the storage room 13 , From the back wall plate 15 jump two L-shaped ribs 16 through the cutting plane of the 3 through to a back wall 17 (S. 4 ) of the inner container 12 in front. Ribs 16 have horizontal thighs 18 extending to sidewalls 19 of the housing or the inner container 12 extend. Above the thighs 18 also enough the rear wall plate 15 to the side walls 19 approach, below the thighs 18 is between the back panel 15 and the side walls 19 one passage each 20 kept free.

Vertical thighs 26 the ribs 16 may be connected to each other by a rib that extends from an upper edge of the back panel 15 goes out and down to the back wall 17 of the housing extends to the evaporator chamber 11 to complete at the top. In the embodiment shown here, the evaporator chamber 11 upwards through a rear edge area of a Kühlgutabstellers 27 closed, the storage chamber 13 in an upper and a lower compartment 28 . 29 Splits.

In the back wall plate 15 is in the middle a circular passage 21 educated. In the passage 21 is an axial fan 22 assembled. The running direction of the axial fan 22 is chosen here so that he can breathe through the passages 20 sucks and over the passage 21 in the storage room 14 blows. The sucked air thus flows from the passages 20 coming from both sides on the evaporator 1 to, is by its (in 3 indicated by dashed lines) fins 8th upwards in the direction of the axial fan 22 and the passage 21 distracted and from the axial fan 22 through the passage 21 back to the lower compartment 29 the storage chamber 13 ,

In the presentation of the 3 falls the axis of curvature 4 the microchannel tubes 2 with a rotation axis 23 of the fan 22 together. The lateral edge areas 24 of the evaporator 1 are for those of the passages 20 coming air flow better and with less change in the direction of flow reachable than a middle range 25 of the evaporator 1 , To the flow through the middle area 25 to intensify, may deviate from the presentation of the 3 the axis of curvature 4 above the axis of rotation 23 be positioned. By doing so the middle area 25 of the evaporator 1 closer to the fan axis 23 lies as the lateral edge areas 24 , he is a stronger suction of the fan 22 suspended, so that the air flow per free cross-sectional area in the middle range 25 at the edge areas 24 can be adjusted.

The slats 8th are in 3 exactly radial to the axis of rotation 23 and to the axis of curvature 4 aligned, ie straight lines, the slats 8th extend, crossing each other on the axles 4 . 23 , When rotary axis 23 and axis of curvature 4 as described above, do not coincide, the fins are 8th preferably radially to the axis of curvature 4 oriented.

A deepening 30 in the bottom of the evaporator chamber is provided to catch condensation, the defrosting of the evaporator 1 runs from this. About a passage 31 which starts from the lowest point of the depression 30 through the insulation layer 14 extends, the condensate enters the evaporator chamber 11 into the open, preferably in an evaporation tray in one below the evaporator chamber 11 in the housing recessed engine room 32 ,

4 shows a section in the depth direction of the housing, along the fan axis 23 through the storage room 13 and the evaporator chamber 11 , The axial fan 22 is in a short pipe socket 33 housed by the passage 21 in the storage room 13 protrudes into it. Instead of the axial fan 22 could be on the passage 21 in the evaporator chamber 11 Also, a radial fan can be placed over the passage 20 sucks and the sucked air in the radial direction, through the evaporator 1 through, thrown off.

From the side edges of the back panel 15 Hollow sidewalls extend 34 along the side walls 19 the housing forward to close to an open, normally closed by a door in operation front 35 of the housing. The side cheeks 34 can as one with the back panel 15 one-piece interior lining spray-formed or with the back panel 15 be assembled to an interior trim assembly, the assembly of the refrigerator from the front 35 out into the inner container 12 is inserted.

In the inserted state, the side walls limit 34 together with the adjacent side walls 19 of the housing each have an air duct 36 that is from an inlet 37 at the front end to the passages 20 the back panel 11 extends. Near the front end is generally the heat input from the environment to the storage chamber 13 particularly strong, since here usually only a magnetic seal the storage chamber 13 isolated from the environment. About the air channels 36 For example, air that has warmed up at the magnetic seal can be sucked off and passed through the evaporator 1 to be cooled; so can spread the penetrating through the magnetic seal heat in the storage chamber 13 prevents and a temperature gradient between a near-door warm area and a cold area close to the rear of the storage chamber 13 be limited.

The inlets 37 can each be like in 4 be shown with a grid to prevent the ingress of foreign bodies in the air channels 31 to prevent.

5 shows a section through the housing of the refrigerator along a to the plane III-III parallel, in 4 level labeled VV. In this section you can clearly see the air channels 36 that are on both side walls 19 of the housing and the side cheeks 34 that the air channels 36 from the storage room 13 separate.

The microchannel tubes 3 of the evaporator 1 on the one hand should be as wide as possible in order to embrace the air flowing through the evaporator on as long a path as possible and to cool it; on the other hand, the flexibility of the microchannel tubes 3 around the axis of curvature perpendicular to its broad sides 4 the smaller, the broader they are. To prevent excessive curvature of the microchannel tubes 3 to problems in the production of the evaporator 1 leads and at the same time a sufficient cooling of the air on its way through the evaporator chamber 11 It can therefore be helpful to have two evaporators 1 . 1' as in 6 shown on the way the air through the evaporator chamber 11 to arrange in series. Preferably, the evaporators 1 . 1' concentric, ie with coincident axes of curvature 4 arranged.

To ensure a uniform flow through both evaporators 1 . 1' on their entire passage cross section, both should respect the axis of curvature 4 span the same angle α. As in the case of 3 this angle α measures between 90 ° and 180 °.

The individual microchannel tubes 2 ' the outer evaporator 1' are longer than the pipes 2 of the inner evaporator 1 They therefore offer space for a larger number of slats 8th as the pipes 2 , By moving along one to the axis 4 concentric arc, z. B. the neutral fiber, the tubes 2 . 2 ' measured distance between the slats 8th at both evaporators 1 . 1' is chosen equal, can high efficiency of heat exchange in the outer evaporator 1' be ensured while at the same time a deterioration of the air flow in the inner evaporator by too small a distance between the near-axis ends of the slats 8th is avoided.

In the embodiment of 6 are the evaporators 1 . 1' also connected in series with respect to the flow of the refrigerant; to a pipe section extends 38 radially between two distributors 7 . 7 ' the evaporator 1 . 1' , One injection point is at the other distributor 7 of the inner evaporator 1 formed here by opening a capillary 39 in the distributor 7 so that refrigerant and air are the two evaporators 1 . 1' flow in opposite directions.

In the embodiment of 7 the housing and the inner lining of the refrigerating appliance are identical to those in 3 or 6 shown. Refrigerant lines 2 ' an evaporator 1" are formed by a cylindrical tube, which is curved around the axis of curvature 4 and the rotation axis 23 of the fan 22 extends. The refrigerant pipes 2 ' are here over a bow 5 ' connected in series and extend with different radii about the axis 4 , Other arcuate refrigerant lines can be along the axis 4 be offset from each other. Each refrigerant line 2 ' is a strip-shaped lamella 8th" assigned to one of its longitudinal edges with the refrigerant line 2 ' is soldered around and radially from the refrigerant line 2 ' projects.

LIST OF REFERENCE NUMBERS

1, 1 '

Evaporator

2, 2 ''

Refrigerant line

3, 3 '

Microchannel tube

4

axis of curvature

5, 5 ''

bow

6

axis of curvature

7,7 '

distributor

8, 8 "

lamella

9

edge

10

rib

11

evaporator chamber

12

inner container

13

storage chamber

14

insulation layer

15

Backplane

16

rib

17

rear wall

18

horizontal thigh (the rib 16 )

19

Side wall

20

passage

21

passage

22

Axial

23

axis of rotation

24

Edge area (of the evaporator 1 )

25

middle range (of the evaporator 1 )

26

vertical thigh (the rib 16 )

27

Kühlgutabsteller

28

upper compartment

29

lower compartment

30

deepening

31

passage

32

engine room

33

pipe socket

34

side cheek

35

front

36

air duct

37

inlet

38

pipe section

39

capillary

Claims (11)

Refrigerating appliance having at least one storage chamber (13), an evaporator chamber (11) and a fan (22) arranged at a passage (21) between the storage chamber (13) and the evaporator chamber (11) and having an axis of rotation (23) in the evaporator chamber ( 11) arranged evaporator (1), characterized in that arcuate refrigerant lines (2) of the evaporator (1) extend around the axis of rotation (23). Refrigeration device after Claim 1 , characterized in that the evaporator (1) has lamellae (8, 8 ") which protrude from the refrigerant lines (2) in a radial direction. Refrigeration device after Claim 2 , characterized in that the lamellae (8 ") comprise at least one plate which extends helically around one of the refrigerant lines (2"). Refrigeration device after Claim 2 , characterized in that two spaced apart along the axis of rotation refrigerant pipes (2) via the fins (8) are connected. Refrigerating appliance according to one of the preceding claims, characterized in that radially spaced apart from the axis of rotation refrigerant pipes (2) extend in a common multi-chamber tube (3). Refrigerating appliance according to one of the preceding claims, characterized in that the refrigerant lines (2) extend around the axis of rotation (23) over an angle of at least 90 °. Refrigerating appliance according to one of the preceding claims, characterized in that the refrigerant lines (2) extend around the axis of rotation (23) over an angle of at most 180 °. Refrigerating appliance according to one of the preceding claims, characterized in that the storage chamber (13) and the evaporator chamber (11) are housed in a common housing, the storage chamber (13) adjacent to a door of the housing and the evaporator chamber (11) to one of the door opposite rear wall (17) of the housing adjacent. Refrigeration device after Claim 8 , characterized in that air channels (36) extend on side walls (19) of the housing from one of the door facing the front end to the evaporator chamber (11). Refrigeration device after Claim 9 , characterized in that the air ducts (36) extend on both sides of an extract box. Refrigeration device after Claim 8 or 9 characterized in that an inner lining is inserted in the housing, that the passage (21) is formed in a rear panel (15) of the inner lining extending between the chambers (11, 13) and the inner lining further comprises side panels (34) extending between the air channels (36) and the storage compartment (13).

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