DE102011078317A1 - Refrigeration device with an evaporator - Google Patents

Abstract

The invention relates to a refrigeration device, in particular household refrigerating appliance, comprising an evaporator (101) with an evaporator inlet (103) for receiving refrigerant to be evaporated, a suction line (105) downstream of the evaporator (101) for discharging the evaporated refrigerant from the evaporator (101st) ), one of the suction line (105) fluidly downstream compressor (107) for compressing the refrigerant, a compressor (107) fluidically downstream condenser (109) for liquefying the refrigerant, and a condenser (109) fluidically downstream capillary throttle (113), which is thermally coupled to the evaporator inlet (103).

Description

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 recognition that the refrigerant at the evaporator evaporator inlet can be efficiently effected by thermal coupling of the capillary restrictor with the evaporator inlet. The resulting from the evaporation of the refrigerant in the evaporator or evaporator inlet cold is used by the thermal coupling between the evaporator inlet and the capillary throttle for re-cooling the capillary throttle and the refrigerant therein, whereby the refrigerant can be further cooled at the evaporator inlet. 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 downstream of the evaporator suction line for discharging the evaporated refrigerant from the evaporator, a downstream of the suction line compressor for compressing the refrigerant, a the Compressor fluidically downstream condenser for liquefying the refrigerant and a condenser fluidly downstream capillary.

A refrigeration appliance is understood in particular to be a household refrigeration appliance, that is to say a refrigeration appliance which is used for household purposes or possibly also in the gastronomy sector, and in particular for storing food and / or drinks in household quantities at specific temperatures, such as, for example, 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. In one embodiment, the evaporator inlet is provided to recool the 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, an advantageous for the thermal coupling heat exchanger section is defined.

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. If the evaporator is a plate evaporator, it can be realized by means of a roll bonding method in which two metal sheets are joined together. The refrigerant channels and the evaporator inlet can be generated by inflation.

According to one embodiment, both the evaporator inlet and the capillary throttle are 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:

1 a refrigeration device;

2 a refrigerated goods container with an external evaporator; and

3 a refrigerated goods container with an external evaporator.

1 shows a refrigerator 100 with an evaporator 101 for evaporation of refrigerant. The refrigerant to be evaporated becomes the evaporator 101 over the evaporator inlet 103 fed. After evaporation, the vaporized refrigerant is removed via the suction line 105 from the evaporator 101 guided and a compressor 107 fed. The compressor 107 is fluidically a condenser 109 downstream, in which the through the compressor 107 compressed refrigerant is liquefied. The liquid refrigerant can optionally be a desiccant 111 converted, for example, has zeolite and is intended to extract water from the liquid refrigerant.

That of the condenser 109 originating liquid refrigerant becomes a capillary throttle 113 supplied, which is provided to cool the liquid refrigerant. An outlet of the capillary throttle 113 is with the evaporator entry 103 connected so that the evaporator entry 103 the liquid refrigerant from the capillary throttle 113 receives.

As in 1 exemplified is a section of the capillary throttle 113 for example over a length d with the evaporator inlet 103 thermally coupled. The length d may be 500 mm, for example. This will cause the evaporator inlet 103 cooled by this additional refrigerant cools, which can be prevented during the injection of the refrigerant in the evaporator, the formation of too large gas bubbles. This reduces any gas bubble noise.

As in 1 exemplified is the capillary throttle 113 along the evaporator inlet 103 tethered. According to another embodiment, a portion of the capillary throttle 113 however, around the evaporator entry 103 are wound with a winding length of, for example, more than 400 mm and less than 600 mm, preferably about 500 mm. This also provides efficient thermal coupling between the capillary throttle 113 and the evaporator inlet 103 causes.

The capillary throttle 113 For example, it may be a capillary tube which, as in FIG 1 shown, optionally can have multiple windings. According to a further embodiment, the thermal coupling in the interior of the evaporator inlet, ie, for example, on the inner wall, are performed.

The compressor 107 , the liquefier 109 and the desiccant 111 can be realized in a conventional manner.

According to another embodiment, the evaporator inlet 103 as well as with this thermally coupled portion of the capillary throttle coated with a foam layer or they are passed through a foam layer. This can prevent the evaporation from entering 103 is positioned directly on an evaporator heat exchanger surface, whereby the thermal efficiency is increased. The connection of the evaporator inlet 103 thermally coupled portion of the capillary throttle 113 can be accomplished, for example, by soldering, gluing, shrinking or by other wing methods. 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 due to an excessive heat input of the capillary throttle 113 in the evaporator inlet 103 is not negatively influenced. Furthermore, the capillary throttle 113 not be made arbitrarily long. For these considerations, the heat exchanger path, ie the distance along which the capillary throttle 113 with the evaporator inlet 103 thermally coupled, for example, longer than 400 mm and shorter than 600 mm. Preferably, the heat exchanger section is 500 mm.

Due to the heat exchange between the capillary throttle 113 and the evaporator inlet 103 In addition, the capillary throttle is recooled. The in the evaporator entry 103 Cold temperatures resulting from the expansion of the refrigerant lead to efficient recooling of the gaseous part of the plug flow in the capillary throttle, resulting in homogeneous flow conditions and thus substantially less injection noise in the evaporator 101 be achieved.

2 shows a section of a refrigerator with a refrigerated goods 201 as well as evaporator snakes 203 which lies outside around a portion of the refrigerated goods container 201 are wrapped around. The evaporator snakes 203 form an evaporator with an evaporator inlet 205 for supplying refrigerant to the evaporator and with a suction pipe 207 for draining vaporized refrigerant from the evaporator. In 2 is also a capillary throttle 209 which, for example, one or more windings 211 may have and which a Kapillardrosselabschnitt 213 which thermally enters with the evaporator 105 is coupled. The capillary throttle section may, for example, be connected longitudinally to the evaporator inlet.

3 shows an enlarged view of the in 2 shown section of the refrigerator.

As in the 2 and 3 illustrated, the evaporator is outboard, ie the evaporator comprises outside of an interior of the container 201 lying evaporator coils 203 , However, the evaporator can be an internal evaporator with evaporator coils, which are inside the container 201 can be arranged. In both cases, the evaporator can enter 213 ? together with the capillary throttle section 205 be 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

 The refrigerator

101

 Evaporator

103

 evaporator inlet

105

 suction

107

 compressor

109

 condenser

111

 desiccant

113

 capillary throttle

201

 refrigerated goods

203

 evaporator coil

205

 evaporator inlet

207

 suction tube

209

 capillary throttle

211

 winding

213

 Capillary throttle section / evaporator inlet ??

d

 length

Claims (14)

Refrigerating appliance, in particular household refrigerating appliance, comprising an evaporator ( 101 ) with an evaporator inlet ( 103 ) for receiving refrigerant to be evaporated, an evaporator ( 101 ) fluidically downstream 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 compressor ( 107 ) fluidically downstream condenser ( 109 ) for liquefying the refrigerant, and a condenser ( 109 ) fluidically downstream capillary throttle ( 113 ), characterized in that the capillary throttle ( 113 ) with the evaporator inlet ( 103 ) is thermally coupled. Refrigerating appliance according to claim 1, characterized in that the capillary throttle ( 113 ) the Evaporator ( 101 ), in particular the evaporator entry ( 103 ), upstream in terms of flow. Refrigerating appliance according to claim 1, characterized in that the evaporator inlet ( 103 ), the capillary throttle ( 113 ) to cool. Refrigerating appliance according to one of the preceding claims, characterized in that the capillary throttle ( 113 ) the liquefier ( 109 ) is downstream fluidically. Refrigerating appliance according to one of the preceding claims, characterized in that the capillary throttle ( 113 ) is a capillary tube. Refrigerating appliance according to one of the preceding claims, characterized in that the capillary throttle ( 113 ) at the evaporator inlet ( 103 ) is 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 ( 113 ) along the evaporator inlet ( 103 ) thermally connected or around the evaporator inlet ( 103 ) is wound. Refrigerating appliance according to one of the preceding claims, characterized in that the capillary throttle ( 113 ) with the evaporator inlet ( 103 ) is thermally coupled along a length of more than 400 mm and less than 600 mm, in particular along a length of 500 mm. 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 ), and that the evaporator ( 101 ) lying outside around the refrigerated goods container ( 201 ), in particular wound, is. Refrigerating appliance according to one of the preceding claims, characterized in that the evaporator inlet ( 103 ) and the capillary throttle ( 113 ) are surrounded or covered by a foam layer. Refrigerating appliance according to one of the preceding claims, characterized in that the suction line ( 105 ) is a suction tube. Refrigerating appliance according to one of the preceding claims, characterized in that a desiccant, in particular zeolite, is provided in order to close the capillary throttle ( 113 ) to dehumidify feedable refrigerant.

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