WO2013000757A2

WO2013000757A2 - Refrigeration appliance comprising an evaporator

Info

Publication number: WO2013000757A2
Application number: PCT/EP2012/061632
Authority: WO
Inventors: Michael Howe; Matthias Mrzyglod; Berthold Pflomm
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2011-06-29
Filing date: 2012-06-19
Publication date: 2013-01-03
Also published as: WO2013000757A3; DE102011078317A1

Abstract

The invention relates to a refrigeration appliance, in particular a domestic refrigeration appliance, comprising an evaporator (101) that has an evaporator inlet (103) for receiving refrigerant to be evaporated, a suction pipe (105), mounted downstream of the evaporator (101), for discharging the evaporated refrigerant from the evaporator (101), a compressor (107), mounted downstream of the suction pipe (105), for compressing the refrigerant, a condenser (109), mounted downstream of the compressor (107), for condensing the refrigerant, and a capillary throttle (113) which is mounted downstream of the condenser (109) and is thermally coupled to the evaporator inlet (103).

Description

Refrigeration device with an evaporator

The present invention relates to a refrigeration appliance, in particular household refrigeration appliance, with an evaporator.

Conventional domestic refrigerators, such as refrigerators, freezers, etc., have a refrigerant circuit in which a compressor, a condenser, and an evaporator are connected in series, with a high pressure area of the refrigerant circuit ranging from the compressor to a capillary restrictor which is the entrance of the evaporator forms a low pressure range from the evaporator to the input of the compressor. The pressure drop from the high pressure area to the low pressure area gradually takes place on the way of the refrigerant through the capillary throttle. Therefore, during the passage of the refrigerant through the capillary throttle, partial evaporation may occur. This leads to a strong noise at the outlet of the capillary throttle, which is perceived by users of refrigeration equipment as disturbing.

Although it is possible to avoid with the help of an expansion valve such a noise by the liquid refrigerant present in front of the expansion valve at high pressure in the expansion valve is suddenly expanded. However, such expansion valves are complicated and expensive.

Object of the present invention is to develop a cooling circuit for a refrigerator, in particular household refrigeration appliance, which uses a capillary throttle to relax the refrigerant and in which excessive noise during the expansion of the refrigerant is avoided.

This object is solved by the features of the independent claim. Advantageous forms of further education are the subject of the dependent claims. The invention is based on the finding that the refrigerant at the evaporator evaporator inlet efficiently by a thermal coupling of the capillary with the

Evaporator entry can be effected. The resulting from the evaporation of the refrigerant in the evaporator or evaporator inlet is due to the thermal Coupling between the evaporator inlet and the capillary choke used to re-cool the capillary throttle and the refrigerant therein, whereby the

Refrigerant at the evaporator inlet can be cooled even further. As a result, the reduction of the gas fraction at the evaporator inlet is also realized particularly advantageously. If the gas content at the evaporator inlet is reduced, so large gas bubbles can not form, which could cause noticeable and therefore disturbing noises. Due to a sufficient cooling of the refrigerant, the formation of gas bubbles is thus prevented upon injection of the refrigerant into the evaporator at the evaporator inlet. In this way, a noise by gas bubbles at the evaporator inlet is prevented.

According to one aspect, the invention relates to a refrigeration device, comprising an evaporator with an evaporator inlet for receiving refrigerant to be evaporated, a suction line downstream of the evaporator for discharging the evaporated refrigerant from the evaporator, one of the suction line

Fluidically downstream compressor for compressing the refrigerant, a compressor downstream of the compressor condenser for liquefying the refrigerant and a condenser downstream of the condenser

Capillary throttle.

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.

According to one embodiment, the capillary throttle is upstream of the evaporator, in particular the evaporator inlet, in terms of flow. The refrigerant at the outlet of the capillary throttle is thereby fed directly to the evaporator inlet.

According to one embodiment, the evaporator inlet is provided to the

Recool capillary throttle. This re-cooling is effected by the cold produced in the evaporator of the refrigerant in the evaporator due to the thermal coupling between the evaporator inlet and the capillary throttle. According to one embodiment, the capillary throttle is downstream of the condenser fluidly. As a result, the capillary throttle receives the liquefied refrigerant from the condenser.

According to one embodiment, the capillary throttle is a capillary tube.

According to one embodiment, the capillary throttle is attached to the evaporator inlet or in the evaporator inlet heat-conducting, in particular by gluing, soldering, shrinking or joining. This can be effected in a particularly advantageous manner, a thermal coupling.

According to one embodiment, the capillary throttle is thermally connected longitudinally to the evaporator inlet. This creates a thermal coupling path, which allows efficient thermal coupling.

According to one embodiment, the capillary throttle with the evaporator inlet, which may be for example an injection tube, is thermally coupled along a length of more than 400 mm and less than 600 mm, in particular along a length of about 500 mm. As a result, one advantageous for the thermal coupling

Defined heat exchanger section.

According to one embodiment, the evaporator inlet is an inlet pipe, in particular an injection pipe.

According to one embodiment, the evaporator is a tube evaporator, in particular a tube coil evaporator or a plate evaporator. Is this the case

Evaporator around a plate evaporator, so this can with the help of a

Rollbondverfahren in which two metal sheets are joined, realized. The refrigerant channels and the evaporator inlet can by

Inflation will be generated. According to one embodiment, both the evaporator inlet and the

Capillary throttle surrounded by a foam layer, in particular covered. This allows the evaporator inlet to cool the capillary throttle particularly efficient. According to one embodiment, the suction line is a suction tube.

According to one embodiment, a desiccant is disposed between the condenser and the capillary throttle, which comprises, for example, zeolite and is intended to dehumidify the refrigerant. The desiccant absorbs any residual water present in the refrigerant and binds it. The refrigerant is passed through the desiccant. The bound water remains in the desiccant and is bound by it.

According to one embodiment, the refrigeration device comprises a refrigerated goods container, wherein the evaporator is arranged outside of the refrigerated goods container. The evaporator can, for example, be arranged on the outside of the refrigerated goods container, for example wound, in order to cool it.

Further embodiments will be explained with reference to the accompanying drawings. Show it:

Fig. 1 a refrigeration device;

FIG. 2 shows a refrigerated goods container with an external evaporator; FIG. and

3 shows a refrigerated goods container with an external evaporator.

1 shows a refrigerator 100 with an evaporator 101 for evaporating

Refrigerant. The refrigerant to be evaporated is the evaporator 101 via the

Evaporator inlet 103 supplied. After evaporation, the vaporized refrigerant is guided out of the evaporator 101 by means of the suction line 105 and fed to a compressor 107. The compressor 107 is fluidly downstream of a condenser 109, in which the compressed by the compressor 107 refrigerant is liquefied. The liquid refrigerant can optionally transferred by a desiccant 1 1 1, for example, has zeolite and is intended to extract water from the liquid refrigerant.

The liquid refrigerant originating from the condenser 109 is supplied to a capillary throttle 13, which is provided to cool the liquid refrigerant. An output of the capillary throttle 1 13 is connected to the evaporator inlet 103, so that the

Evaporator inlet 103, the liquid refrigerant from the capillary throttle 1 13 receives.

As shown by way of example in FIG. 1, a section of the capillary throttle is 13

For example, thermally coupled to the evaporator inlet 103 over a length d. The length d may be 500 mm, for example. As a result, the evaporator inlet 103 is additionally cooled by recooling the refrigerant which can be fed thereto, whereby the formation of gas bubbles that are too large can be prevented when the refrigerant is injected into the evaporator. This will be any

Gas bubble noise reduced.

As shown by way of example in FIG. 1, the capillary throttle 1 13 is longitudinally connected to the

Evaporator inlet 103 connected. According to another embodiment, however, a portion of the capillary throttle 13 may be wound around the evaporator inlet 103 with a winding length of, for example, more than 400 mm and less than 600 mm, preferably about 500 mm. As a result, an efficient thermal coupling between the capillary throttle 1 13 and the evaporator inlet 103 is also effected.

The capillary throttle 1 13 may, for example, be a capillary tube which, as shown in FIG. 1, may optionally have a plurality of windings. According to another

Embodiment, the thermal coupling inside the evaporator inlet, i. for example, on the inner wall, are performed.

The compressor 107, the condenser 109 and the desiccant 1 1 1 can be realized in a conventional manner.

According to a further embodiment, the evaporator inlet 103 as well as the portion of the capillary throttle thermally coupled thereto are enveloped with a foam layer or they are guided through a foam layer. This can be prevented will be that the evaporator inlet 103 is positioned directly on an evaporator heat exchanger surface, whereby the thermal efficiency is increased. The connection of the thermally coupled to the evaporator inlet 103 portion of the capillary throttle 1 13, for example, by soldering, gluing, shrinking or by others

Wing method be accomplished. The length of the thermal connection is preferably chosen such that, on the one hand, a heat exchange is made possible and, on the other hand, the efficiency of the evaporator is not adversely affected by an excessive heat input of the capillary throttle 13 into the evaporator inlet 103. Furthermore, the capillary throttle 1 13 can not be made arbitrarily long. For these reasons, the heat exchanger path, i. the distance along which the capillary throttle 1 13 is thermally coupled to the evaporator inlet 103,

for example, longer than 400 mm and shorter than 600 mm. Preferably, the

Heat exchanger section 500 mm. Due to the heat exchange between the capillary 1 13 and the

Evaporator inlet 103, the capillary throttle is additionally recooled. The im

Evaporator inlet 103 due to expansion of the refrigerant resulting cold

Temperatures lead to an efficient recooling of the gaseous part of the plug flow in the capillary throttle, as a result of which homogeneous flow conditions and thus substantially less injection noise in the evaporator 101 are achieved.

FIG. 2 shows a section of a refrigeration appliance with a refrigerated goods container 201 and evaporator coils 203, which lie outside about a section of the refrigerator

Refrigerated goods container 201 are wound around. The evaporator coils 203 form an evaporator having an evaporator inlet 205 for supplying refrigerant to the evaporator

Evaporator and with a suction pipe 207 for discharging vaporized refrigerant from the evaporator. In FIG. 2, a capillary throttle 209 is also shown, which may, for example, have one or more windings 21 1 and which comprises a capillary throttle section 213, which is thermally coupled to the evaporator inlet 105. The Kapillardrosselabschnitt can, for example, along the

Evaporator inlet be connected.

FIG. 3 is an enlarged view of the portion of FIG

Refrigerator. As shown in FIGS. 2 and 3, the evaporator is outboard, ie the

Evaporator comprises lying outside of an interior of the container 201

Evaporator coils 203. However, the evaporator can be an internal evaporator with evaporator coils, which can be arranged in the interior of the container 201. In both cases, the evaporator inlet 213? together with the

Capillary throttle portion 205 are guided by foam, whereby the thermal exchange between the capillary throttle 209 and the evaporator inlet 205 can be improved.

LIST OF REFERENCE NUMBERS

100 refrigeration unit

101 evaporator

103 Evaporator entry

105 suction line

107 compressors

109 liquefier

1 1 1 desiccant

1 13 capillary throttle

201 refrigerated goods container

203 Evaporator coil

205 Evaporator entry

207 intake manifold

209 capillary throttle

2 1 winding

213 Capillary throttle section / evaporator inlet ?? d length

Claims

1. Refrigeration appliance, in particular domestic refrigeration appliance, comprising an evaporator (101) having an evaporator inlet (103) for receiving refrigerant to be evaporated, a the evaporator (101) downstream in terms of flow suction line (105) for discharging the evaporated refrigerant from the

Evaporator (101), one of the suction line (105) fluidically

downstream compressor (107) for compressing the refrigerant, a condenser (109) downstream of the compressor (107) for liquefying the refrigerant, and a condenser (109)

fluidically downstream capillary throttle (1 13), characterized

in that the capillary throttle (1 13) is thermally coupled to the evaporator inlet (103).

2. Refrigerating appliance according to claim 1, characterized in that the capillary throttle (1 13) upstream of the evaporator (101), in particular the evaporator inlet (103).

3. Refrigerating appliance according to claim 1, characterized in that the evaporator inlet (103) is provided to cool the capillary throttle (1 13).

4. Refrigerating appliance according to one of the preceding claims, characterized in that the capillary throttle (1 13) is downstream of the condenser (109) fluidically.

5. Refrigerating appliance according to one of the preceding claims, characterized in that the capillary throttle (1 13) is a capillary tube.

6. Refrigerating appliance according to one of the preceding claims, characterized in that the capillary throttle (1 13) at the evaporator inlet (103) heat-conducting, in particular by gluing, soldering, shrinking or joining, is attached.

Refrigerating appliance according to one of the preceding claims, characterized in that the capillary throttle (1 13) is thermally connected longitudinally to the evaporator inlet (103) or wound around the evaporator inlet (103).

Refrigerating appliance according to one of the preceding claims, characterized in that the capillary throttle (1 13) with the evaporator inlet (103) along a length of more than 400 mm and less than 600 mm, in particular along a length of 500 mm, is thermally coupled.

Refrigerating appliance according to one of the preceding claims, characterized in that the evaporator inlet (103) is an inlet pipe.

Refrigerating appliance according to one of the preceding claims, characterized in that the evaporator (101) is a tube evaporator or plate evaporator.

Refrigerating appliance according to one of the preceding claims, characterized in that a refrigerated goods container (201) is provided, and that the evaporator (101) arranged outside the refrigerated goods container (201), in particular wound, is.

12. Refrigerating appliance according to one of the preceding claims, characterized in that the evaporator inlet (103) and the capillary throttle (1 13) by a

Foam layer are surrounded or covered.

13. Refrigerating appliance according to one of the preceding claims, characterized in that the suction line (105) is a suction tube.

14. Refrigerating appliance according to one of the preceding claims, characterized in that a drying agent, in particular zeolite, is provided to the of

Capillary throttle (1 13) to dehumidify feedable refrigerant.