JP2006046842A - Freezer-refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a freezer-refrigerator capable of preventing a temperature drop, particularly, a local temperature drop of a vegetable housing case without providing a defrosting heater or an exclusive heater of an evaporator for refrigeration by using heat generated in a machine chamber. <P>SOLUTION: A heat conduction member 16 comprising metal tape or plate with favorable heat conductivity is arranged from a portion facing the machine chamber 40 to a portion facing a freezing chamber 30 in a refrigeration chamber side face of a bulkhead 11. Heat from the machine chamber 40, and cold from the freezing chamber 30 are conducted to a refrigeration chamber 20 through the bulkhead 11. By the heat conduction member 16, heat is conducted from the portion facing the machine chamber 40 to the portion facing the freezing chamber 30, and a portion cooled by the cold is heated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a refrigerator-freezer provided with a refrigerator compartment at the top, a freezer compartment at the bottom, a machine compartment at the rear of the refrigerator compartment and / or a freezer compartment, and a vegetable storage case at the bottom of the refrigerator compartment.

  Many domestic refrigerator-freezers have a refrigerator compartment at the top, a freezer compartment at the bottom, and a vegetable storage case at the bottom of the refrigerator compartment. The vegetable storage case is kept at a higher humidity than the inside of the refrigerator compartment in order to keep the freshness of the vegetables.

  In this refrigerator-freezer, although the refrigerator compartment and the freezer compartment are separated by a partition made of heat insulating material, the cold heat of the freezer compartment is conducted to the refrigerator compartment, the temperature of the vegetable storage case decreases, There were problems such as condensation and freezing of the stored vegetables.

As a method for preventing the temperature of the vegetable storage case adjacent to the freezer compartment from decreasing, a special heater is installed on the side of the partition facing the vegetable storage case to energize. However, since there is a problem that the cost increases when the dedicated heater is provided, Patent Document 1 proposes a method of sending air heated by the defrosting heater of the refrigeration evaporator to the vegetable storage case (vegetable room).
Japanese Patent Laid-Open No. 11-311471 (Page 4, FIGS. 4 and 8)

  In the method proposed in Patent Document 1, a defrost heater for a refrigeration evaporator is required. In the case where a refrigeration evaporator or a defrost heater is not provided, the partition wall is also provided on the side facing the vegetable storage case. It is necessary to install a dedicated heater and energize it.

  In addition, it is necessary to increase the heat insulation layer of the partition wall facing the machine room so that the heat generated in the machine room is not transmitted to the refrigerator room and becomes a heat load of the refrigerator room. There was a problem that the effective internal volume decreased.

  Therefore, the present invention uses heat generated in the machine room and can prevent a temperature drop of the vegetable storage case, particularly a local temperature drop, without providing a defrost heater or a dedicated heater for the refrigeration evaporator. An object is to provide a refrigerator-freezer. Moreover, it aims at providing the structure of the refrigerator-freezer which does not thicken the heat insulation layer of the partition which faces a machine room.

  (1) In order to achieve the above object, the present invention provides a freezer compartment, a freezer compartment, and / or a machine compartment in the rear of the refrigerator compartment with a partition placed below the refrigerator compartment at the top of the main body. In the refrigerator-freezer provided with a vegetable storage case at the lowermost part of the refrigerator compartment, a heat conduction member that guides the heat of the machine room to a partition wall located between the freezer compartment and the vegetable storage case It is characterized by having been arranged in.

  According to this configuration, the heat conducted through the partition from the machine room to the refrigerating room is guided to a portion of the partition between the freezer compartment and the vegetable storage case by the heat conducting member disposed on the partition. This part of the partition wall has a lower temperature than the atmosphere in the refrigeration room because cold heat is conducted through the partition wall from the freezer room to the refrigerator room. If this temperature becomes too low, condensation or storage in the vegetable storage case This was the cause of freezing of the vegetables. This can be prevented without providing an expensive dedicated heater by guiding the heat from the machine room with an inexpensive heat conducting member.

  (2) Moreover, this invention has arrange | positioned the said heat-conducting member across the part facing the said freezer compartment from the part facing the said machine room in the surface at the side of the refrigerator compartment of the said partition. .

  According to this configuration, the heat conducting member is conducted through the partition wall, and warm heat is transmitted from the machine room and cold heat is transmitted from the freezer room. The part of the partition facing the freezer compartment is heated by the heat from the machine room led to the heat conducting member, and the part facing the machine room is similarly cooled by the cold from the freezer compartment led to the heat conducting member In addition to preventing the temperature of the vegetable storage case from becoming too low due to cold heat from the freezer compartment, it is possible to prevent the temperature of the refrigerator compartment from rising due to the heat from the machine room, and when no heat conducting member is provided. In comparison, the heat insulating layer of the partition wall facing the machine room can be made thinner.

  According to the present invention, it is possible to prevent condensation and freezing of stored vegetables due to the temperature of the vegetable storage case becoming too low at a low cost with a simple configuration in which the heat conducting member is simply disposed on the partition wall. Moreover, it can prevent that the temperature of a refrigerator compartment raises with the heat from a machine room, and can make the heat insulation layer of the partition facing a machine room thin compared with the case where a heat conductive member is not arrange | positioned.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view as seen from the side of a refrigerator-freezer, and FIG. 2 is a schematic configuration diagram of a cooling cycle.

  The refrigerator-freezer 1 is for food preservation, and the heat insulating casing 10 constitutes the main body. The inside of the heat insulating housing 10 is divided into two upper and lower stages by a partition wall 11. The upper stage is a refrigerator compartment 20, and the lower stage is a freezer compartment 30. The front (left side in FIG. 1) of the refrigerator compartment 20 and the freezer compartment 30 is an opening for taking in and out food, and the heat insulating doors 21 and 31 that can open and close the opening are closed.

  A plurality of shelf boards 22 are provided inside the refrigerator compartment 20. In addition, a vegetable storage case 25 is provided at the bottom of the refrigerator compartment 20 so that it can be pulled out. The vegetable storage case 25 is set to be higher in humidity than other portions of the refrigerator compartment 20 by humidification means (not shown) in order to maintain the freshness of the stored vegetables.

  A shelf 32 and three freezing containers 33a, 33b, and 33c are stored in the freezer compartment 30 so as to overlap each other. The freezing containers 33a, 33b, and 33c are supported on the inner surface of the freezing chamber 30 by both side edges, respectively, and can be pulled out forward.

  A machine room 40 is formed on the back surface of the heat insulating housing 10. The machine room 40 is a structure configured by combining sheet metal parts, and the back side is open. A Stirling refrigerator 50 is accommodated in the machine room 40. The machine room 40 is provided at a height where the upper part substantially coincides with the upper part of the freezer room 30.

  After the Stirling refrigerator 50 is installed, the back side opening of the machine room 40 is closed with a lid 44. The lid 44 is formed with a ventilation port 45 for taking in air for cooling the high-temperature side condenser described later and an opening 47 for connecting an outlet of an air-cooling duct described later.

  A part of the Stirling refrigerator 50 becomes a heat radiating portion 51, and a high temperature side evaporator 61 is attached thereto (see FIG. 2). The heat radiating part 51 and the high temperature side evaporator 61 are in a state of transferring heat to each other, that is, in a state of being thermally connected.

  A high temperature side condenser 62 is installed on the Stirling refrigerator 50. The high temperature side evaporator 61 and the high temperature side condenser 62 are connected by a secondary refrigerant pipe, and constitute a high temperature side secondary refrigerant circulation circuit 60. The secondary refrigerant circulation circuit 60 is sealed with water (including an aqueous solution) or a hydrocarbon refrigerant.

  The other part of the Stirling refrigerator 50 becomes a heat absorption part 52, and a low temperature side condenser 71 is attached thereto (see FIG. 2). The heat absorption part 52 and the low temperature side condenser 71 are in a state of transferring heat to each other, that is, in a thermally connected state.

  A low temperature side evaporator 72 is installed in the back of the freezer compartment 30. The low temperature side condenser 71 and the low temperature side evaporator 72 are connected by a secondary refrigerant pipe, and constitute a low temperature side secondary refrigerant circulation circuit 70. The secondary refrigerant circulation circuit 70 is filled with a natural refrigerant such as carbon dioxide.

  The high temperature side condenser 62 has a structure in which a pipe made of a metal having a high thermal conductivity such as copper, copper alloy, or aluminum is bent, and a plurality of radiating fins 63 also made of a metal having a high thermal conductivity are attached thereto. Similarly, the low temperature side evaporator 72 has a structure in which a pipe made of a metal having a high thermal conductivity is bent and a large number of heat absorbing fins 73 made of a metal having a high thermal conductivity are attached.

  Cooling ducts 80 and 81 extending in the vertical direction along the inner wall on the back side are provided inside the heat insulating housing 10. The cooling duct 80 is located on the back side, and the cooling duct 81 is located on the near side thereof. The cooling duct 80 ends at a height up to the middle of the freezer compartment 30, but the cooling duct 81 continues to the ceiling of the refrigerator compartment 20.

  At the lower end of the cooling duct 80, an air inlet 82 for sucking the internal air from the freezer compartment 30 is provided. A low temperature side evaporator 72 is installed above the intake port 82, and a blower 83 that blows out air to the cooling duct 81 is further provided above the low temperature side evaporator 72.

  Although not shown, a return duct for collecting air from the refrigerator compartment 20 is also provided in the heat insulating casing 10. The return duct has an air outlet at a position facing the low temperature side evaporator 72, and supplies the recovered air to the low temperature side evaporator 72.

  When the Stirling refrigerator 50 is operated, the heat dissipating part 51 becomes high temperature and the heat absorbing part 52 becomes low temperature. The heat of the heat radiating portion 51 is transmitted to the high temperature side condenser 62 through the secondary refrigerant circulation circuit 60. The cold heat of the heat absorption part 52 is transmitted to the low temperature side evaporator 72 via the secondary refrigerant circulation circuit 70.

  When the blower 83 is operated here, air in the freezer compartment 30 is sucked from the inlet 82 at the lower end of the cooling duct 80 and passes through the low-temperature side evaporator 72. Further, the air in the refrigerator compartment 20 is sucked into the cooling duct 80 through the return duct (not shown) and passes through the low temperature side evaporator 72 as well. The air passing through the low temperature side evaporator 72 is cooled and becomes cold.

  The cold air is blown into the cooling duct 81 by the blower 83, and enters the refrigerating chamber 20 through the air outlet 84 provided in the upper part of the duct 81 (the part above the partition wall 11), and the lower part of the cooling duct 81 (below the partition wall 11). Are fed into the freezer compartment 30 through the air outlet 85 provided in the portion. In this way, a predetermined amount of cold air is fed into the refrigerator compartment 20 and the freezer compartment 30, respectively, and the refrigerator compartment 20 and the freezer compartment 30 are each cooled to a predetermined temperature. The control unit 15 installed at the upper back of the heat insulating housing 10 governs the operation control.

  In order to improve the operation efficiency of the Stirling refrigerator 50, it is necessary to efficiently release the condensation heat from the high temperature side condenser 62. For this purpose, an air cooling duct 90 is combined with the high temperature side condenser 62. The air-cooling duct 90 is a synthetic resin molded product having a rectangular cross section of the ventilation path, the inlet portion is disposed above the high-temperature side condenser 62, and the outlet portion is applied to the opening 47 of the lid 44. When viewed from the side, the air cooling duct 90 extends obliquely upward from the inlet to the outlet.

  A blower 91 is inserted into the air cooling duct 90. The blower 91 has two propeller fans arranged in the depth direction of FIG. 1, and the blowing direction coincides with the axis of the air cooling duct 90. The blower 91 can be taken in and out from the outlet of the air cooling duct 90, and is fixed to a mounting protrusion 93 that protrudes from the inner surface of the air cooling duct 90 in a form perpendicular to the duct axis with screws (not shown).

  When the blower 91 is operated, external air is sucked from the vent 45 of the lid 44. The air that has entered the machine room 40 passes through the high temperature side condenser 62 and takes away the heat of condensation released by the high temperature side condenser 62. The air deprived of heat is sucked into the air-cooling duct 90, further sucked into the blower 91, and discharged from there to the outside obliquely upward.

  The lid 44 of the machine room 40 is not a simple flat plate, but has a shape in which the center protrudes toward the back side and the four circumferences are inclined. Out of these slope portions, the outlet of the air cooling duct 90 opens to the slope portion facing obliquely upward. For this reason, a certain gap or more is generated between the outlet of the air cooling duct 90 and the wall surface of the room in which the refrigerator is installed, and air flows smoothly. In order to air-cool the high temperature side condenser 62, a large amount of air is required, but the Stirling refrigerator 50 can always be operated efficiently by securing the air discharge path in this way.

  In the refrigerator-freezer 1 according to the present invention, the heat of the heat radiating unit 51 and the high-temperature side condenser 62 is used for preventing condensation due to overcooling of the vegetable storage case 25 and freezing of the contents.

  An inner wall member 12 formed of a synthetic resin is provided in close contact with the surfaces of the heat insulating housing 10 and the partition wall 11 on the refrigerator compartment 20 side. Between the inner wall member 12 and the partition wall 11, a tape made of a metal having a high thermal conductivity such as copper, copper alloy, aluminum, or the like is thin across a portion facing the freezing chamber 30 from a portion facing the machine chamber 40. A heat conducting member 16 made of a plate is disposed.

  Although the partition wall 11 has a heat insulating structure, since it is exposed to a constant temperature for a long time, heat from the part facing the machine room 40 and cold heat from the part facing the freezer room 30 are conducted to the refrigerator room 20 side, respectively. .

  By disposing the heat conducting member 16, the heat from the machine room 40 conducted through the partition wall 11 is transmitted to the side of the heat conducting member 16 facing the freezer compartment 30, and is cooled by the cold heat from the freezer compartment 30 conducted through the partition wall 11. The heated part is warmed by this heat. On the other hand, the cold heat from the freezer compartment 30 conducted through the partition wall 11 is transmitted to the side of the heat conducting member 16 facing the machine room 40, and the portion heated by the hot heat from the machine room 40 conducted through the partition wall 11 is cooled by this cold heat. It is.

  Cold heat from the freezer compartment 30 caused condensation due to overcooling of the vegetable storage case 25 and freezing of the contents, and warm heat from the machine room 40 caused thermal load (temperature increase) of the refrigerator compartment 20. Conventionally, overcooling of the vegetable storage case 25 has been dealt with by providing a dedicated heater and increasing the thickness of the partition wall 11 by increasing the heat load (temperature rise) of the refrigerator compartment 20. This can be prevented by disposing the inexpensive heat conducting member 16 made of metal tape or metal plate using waste heat generated in the machine room 40 and cold heat conducted from the freezer room 30, and the thickness of the partition wall 11. Can be made thinner than when the heat conducting member 16 is not disposed. Further, if the heat conducting member 16 is provided between the inner wall member 12 and the partition wall 11, the appearance of the heat conducting member 16 is better than that attached to the surface of the inner wall member 12 on the refrigerator compartment side.

  Here, the heat conducting member 16 is not limited to the surface of the partition wall 11, and is disposed inside the partition wall 11 as long as the heat from the machine room 49 does not affect the temperature in the freezer compartment 30. It doesn't matter.

    Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the invention.

    The present invention can be widely used for a refrigerator-freezer.

Vertical section viewed from the side of the refrigerator Schematic configuration diagram of cooling cycle

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerator Refrigerator 10 Heat insulation housing | casing 11 Partition 16 Heat conduction member 20 Refrigeration room 25 Vegetable storage case 30 Freezing room 40 Machine room

Claims (2)

A refrigerator compartment at the top of the main body, a freezer compartment with a partition wall under the refrigerator compartment, a machine compartment at the rear of the refrigerator compartment and / or the refrigerator compartment, and a vegetable storage case at the bottom of the refrigerator compartment In the refrigerator-freezer provided,
A refrigerator-freezer comprising a heat conduction member arranged in the partition for guiding heat of the machine room to a partition located between the freezer and the vegetable storage case.   2. The refrigerator-freezer according to claim 1, wherein the heat conducting member is disposed on a surface of the partition wall facing the refrigerator compartment from a portion facing the machine room to a portion facing the freezer compartment. .

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