Refrigerator

a technology of refrigerators and air conditioners, applied in the field of refrigerators, can solve the problems of dew condensation, deterioration of cooling performance or power consumption, and attachment of moisture in the air, and achieve the effect of improving freezing capability and preventing dew condensation

Inactive Publication Date: 2007-09-20
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]The present invention has been developed to solve the problem of such a conventional technology, and an object is to improve a freezing capability while securely preventing dew condensation along an opening edge by a condenser in a refrigerator in which a refrigerant circuit on a high-pressure side is operated in a supercritical state.

Problems solved by technology

In this case, a disadvantage occurs that a moisture in the air is attached, that is, so-called dew condensation is generated.
However, a disadvantage occurs that a cooling performance deteriorates or power consumption increases owing to the heat of the heater.
In addition, in recent years, such a refrigerator cannot use a heretofore used chlorofluorocarbon-based refrigerant owing to a problem of global environment destruction.
Therefore, the temperature of the refrigerant drops owing to the hat rejection.
Therefore, the refrigerant temperature at the outlet of the condenser cannot be lowered to a value sufficient for securing a freezing capability, and specific enthalpy of the refrigerant flowing through the evaporator also increases.
In consequence, a problem has occurred that the freezing capability of the evaporator remarkably deteriorates, and the cooling in the freezing chamber and the refrigerating chamber is obstructed.

Method used

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Examples

Experimental program
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Effect test

embodiment 1

[0028]FIG. 1 shows a refrigerant circuit diagram of a refrigerator according to one embodiment of the present invention, and FIG. 2 shows a schematic diagram of a dew condensation preventive pipe disposed along an opening edge of an insulation box member of the refrigerator, respectively. A main body of a refrigerator 1 of the embodiment is constituted of an outer box 2 having a front opening and formed of a steel plate; an inner box 3 made of a thin hard synthetic resin (e.g., an ABS resin); an insulation box member 4 made of foamed polyurethane foamed and filled between both the boxes; and an insulation door (not shown) which openably closes the front opening of the insulation box member 4.

[0029]The inside of the insulation box member 4 is vertically divided by a partition wall 5 into, for example, a refrigerating chamber 6 cooled at a refrigerating temperature (e.g., about +5° C.) above the partition wall 5 and a freezing chamber 7 frozen at a freezing temperature (e.g., about −2...

embodiment 2

[0057]It is to be noted that it has been described in Embodiment 1 that the capillary tube 23 is used as a throttle means. However, as shown in FIG. 4, an expansion valve 26 may be used as the throttle means, and an open degree of the expansion valve 26 may be controlled by a controller 50. In this embodiment, a refrigerant pipe 42 before the expansion valve 26 (on an upstream side of the expansion valve 26) and a suction-side pipe 41 exiting from an evaporator 24 are arranged so as to perform heat exchange. In consequence, an internal heat exchanger 27 is constituted. A refrigerant circuit of a refrigerator of the present embodiment shown in FIG. 4 is common to Embodiment 1 described above in many respects. Therefore, detailed description of a constitution which performs the same function as that of the refrigerator 1 of Embodiment 1 and a function similar to that of the refrigerator or which produces the same effect or a similar effect is omitted.

[0058]Next, an operation of the re...

embodiment 3

[0068]In addition, when a dew condensation preventive pipe 22B is moved from a refrigerant downstream region of a conventional condenser to an upstream side as in the above embodiments, a usual operation is not especially obstructed. However, a temperature of a refrigerant flowing through the dew condensation preventive pipe 22B might rise more than necessary during pull-down or under a high load. That is, if the refrigerant temperature of a refrigerant circuit on a high-pressure side abnormally rises during the pull-down or under the high load, during heat rejection in a refrigerant pipe 22A which is a refrigerant upstream region of a condenser 22, the refrigerant cannot sufficiently reject heat and the temperature cannot be lowered. Therefore, a high-temperature refrigerant sometimes enters the dew condensation preventive pipe 22B. Since the dew condensation-preventive pipe 22B is positioned along an opening edge 4A of an insulation box member 4, a user might tough the pipe when o...

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PUM

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Abstract

There is disclosed a refrigerator in which a refrigerant circuit on a high-pressure side is operated in a supercritical state, and an object of the refrigerator is to improve a freezing capacity while securely preventing dew condensation at an opening edge by a condenser. In the refrigerator including the refrigerant circuit constituted of a compressor, the condenser, a throttle means and an evaporator; and a dew condensation preventive pipe constituting a part of the condenser and disposed along the opening edge of an insulation box member, the refrigerant circuit on the high-pressure side is operated in the supercritical state, and the dew condensation preventive pipe is positioned on an upstream side of a refrigerant downstream region of the condenser.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a refrigerator in which a dew condensation preventive pipe constituting a part of a condenser (or gas cooler or condensing heat exchanger or gas cooling heat exchanger) of a refrigerant circuit is disposed along an opening edge of an insulation box member in order to prevent dew condensation of a main body. The present invention more particularly relates to a refrigerator in which a refrigerant circuit on a high-pressure side is operated in a supercritical state.[0002]Heretofore, in this type of refrigerator, an insulation box member is constituted of a metallic outer box, an inner box made of a hard synthetic resin and an insulation material foamed and filled between both the boxes. In the inner box, a freezing chamber and a refrigerating chamber are constituted so as to freeze or refrigerate and store food and the like in the inner box. An insulation door is disposed on a front surface of this insulation box member,...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F25B47/00
CPCF25B6/04F25B9/008F25B40/00F25B2309/061F25B2400/04F25D2700/14F25B2600/2501F25B2700/21163F25D21/04F25D2700/123F25B2400/052
Inventor ITSUKI, HIROYUKI
Owner SANYO ELECTRIC CO LTD
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