JP7063970B2 - refrigerator - Google Patents

Description

The present invention relates to a refrigerator.

Japanese Patent Application Laid-Open No. 2014-134332 (Patent Document 1) is available as a background technique in this technical field. This publication describes "a refrigerator capable of individually cooling a refrigerating room and a freezing room" and "a refrigerator is a 1-evaporator type refrigerator using cold air cooled by one evaporator". .. Further, "the heat insulating member is arranged in front of the cooler along the Z direction (vertical direction)", and "the front member and the rear member of the heat insulating member are preferably plastic cases for maintaining the shape." It is described as "body".

Japanese Unexamined Patent Publication No. 2014-134332

In the refrigerator of Patent Document 1, one evaporator is used to separately cool the refrigerating chamber and the freezing chamber. Since air in different temperature zones flows in the evaporator chamber in which the evaporator is housed in the freezing operation and the refrigerating operation, the air temperature in the evaporator chamber fluctuates greatly according to the switching of the operation.

Therefore, the partition member (insulation member of Patent Document 1) provided between the freezer chamber and the evaporator chamber serves as a heat insulating wall that suppresses heat transfer from the evaporator chamber during the refrigerating operation to the freezer chamber having a lower temperature. A role is required. In the refrigerating operation, the air in the refrigerating room, which is hotter than the freezing room, flows in the evaporator room. There is sex.

Further, when the freezing operation is switched to the refrigerating operation, the partition member having a low temperature during the freezing operation is heated by the air in the refrigerating room having a higher temperature than the freezing room flowing through the evaporator room. The heat transferred to and stored in the partition member during the refrigerating operation becomes a heat load in the subsequent freezing operation, so that the amount of heat to be cooled increases by that amount.

Since the refrigerating operation has a lower cooling efficiency than the refrigerating operation in which the evaporation temperature is high, the energy saving performance can be improved by suppressing the amount of heat to be cooled in the refrigerating operation. However, in the refrigerator of Patent Document 1, consideration for heat transfer to the partition member provided between the freezing chamber and the evaporator chamber is not sufficient, and a large amount of heat is transferred to the partition member during the refrigerating operation. Was there. When the amount of heat transferred to the partition member increases, the amount of heat cooled during the freezing operation also increases, so that the refrigerator of Patent Document 1 has not sufficiently obtained energy saving performance.

Therefore, the present invention has improved energy saving performance by suppressing the transfer of heat to the partition member and suppressing the amount of heat cooled by the refrigerating operation in the refrigerator in which the refrigerating chamber and the freezing chamber are individually cooled by one evaporator. The purpose is to provide a refrigerator.

In order to solve such a problem, the first invention of the present invention
An evaporator that cools the first storage chamber in the refrigerating temperature zone, the second storage chamber in the freezing temperature zone, the first storage chamber and the second storage chamber, and the evaporation that houses the evaporator. In a refrigerator provided with a container chamber and a partition member for partitioning the evaporator chamber and the second storage chamber, and capable of controlling to cool the first storage chamber and the second storage chamber individually.
The individual cooling controls include a refrigerating operation or a blowing operation for cooling the first storage chamber while circulating air in the first storage chamber in the evaporator chamber, and the second in the evaporator chamber. It is performed by distinguishing between the refrigerating operation of cooling the second storage chamber while circulating the air in the storage chamber.
The partition member is composed of a plurality of members, and the first member of the partition member constituting the wall surface on the evaporator chamber side constitutes the wall surface of the partition member on the second storage chamber side. A refrigerator characterized by having a smaller heat capacity per unit volume than the second member.
Further, the second invention of the present invention
An evaporator that cools the first storage chamber in the refrigerating temperature zone, the second storage chamber in the freezing temperature zone, the first storage chamber and the second storage chamber, and the evaporation that houses the evaporator. In a refrigerator provided with a container chamber and a partition member for partitioning the evaporator chamber and the second storage chamber, and capable of controlling to cool the first storage chamber and the second storage chamber individually.
The individual cooling controls include a refrigerating operation or a blowing operation for cooling the first storage chamber while circulating air in the first storage chamber in the evaporator chamber, and the second in the evaporator chamber. It is performed by distinguishing between the refrigerating operation of cooling the second storage chamber while circulating the air in the storage chamber.
Among the partition members, the first member constituting the wall surface on the evaporator chamber side is a refrigerator having a heat capacity of less than ³⁰⁰ kJ / (m3 · K) and a thickness of 10 mm or less per unit volume.
Further, in each of the first and second inventions, the partition member may separate the evaporator chamber and the first storage chamber.

According to the present invention, in a refrigerator in which a refrigerator compartment and a freezer compartment are individually cooled by one evaporator, energy saving performance is achieved by suppressing heat transfer to a partition member and suppressing the ratio of the amount of heat cooled by the refrigerating operation. An improved refrigerator can be provided.

Front view of the refrigerator according to the first embodiment. FIG. 1A is a cross-sectional view taken along the line AA shown in FIG. A time chart in an example of a cooling operation of a refrigerator. An enlarged view of the periphery of the evaporator chamber 8 shown in FIG. The figure which shows the change of the temperature gradient of the wall surface with respect to the change of the ambient temperature (when the heat capacity per unit volume is small). The figure which shows the change of the temperature gradient of the wall surface with respect to the change of the ambient temperature (when the heat capacity per unit volume is large). A time chart showing temperature changes at temperature measurement points X and Y shown in FIG. Analysis results showing the relationship between the heat capacity per unit volume and the amount of heat transfer that flows into the member during refrigeration operation. Front view of the refrigerator according to the second embodiment. BB sectional view shown in FIG.

<< Example 1 >>
Example 1 of the refrigerator according to the present invention will be described with reference to FIGS. 1 to 7.
FIG. 1 is a front view of the refrigerator according to the first embodiment, and FIG. 2 is a sectional view taken along the line AA shown in FIG. The refrigerator 1 includes a refrigerating room 2, an ice making room 3, an upper freezing room 4, a lower freezing room 5, and a vegetable room 6 in order from the top as storage rooms. The refrigerating room 2 and the vegetable room 6 are the first storage rooms in the refrigerating temperature zone (0 ° C. or higher). The freezing chamber 60 is a general term for the ice making chamber 3, the upper freezing chamber 4, and the lower freezing chamber 5, and is a second storage chamber in the freezing temperature zone (0 ° C. or lower). In this embodiment, the refrigerating room 2 is controlled to have a temperature of about 4 ° C., the vegetable room 6 is controlled to have a temperature of about 7 ° C., and the freezing room 60 is controlled to have a temperature of about −20 ° C.

The refrigerating room 2 is provided with double doors 2a and 2b having double doors on the front side, and the ice making room 3, the upper freezing room 4, the lower freezing room 5, and the vegetable room 6 are each pull-out type. The ice making room door 3a, the upper freezing room door 4a, the lower freezing room door 5a, and the vegetable room door 6a are provided. In the following, the refrigerating room doors 2a and 2b, the ice making room door 3a, the upper freezing room door 4a, the lower freezing room door 5a, and the vegetable room door 6a are simply referred to as doors 2a, 2b, 3a, 4a, 5a, and 6a.

The inside and outside of the refrigerator 1 are a heat insulating box body 10 formed by filling, for example, a foamed heat insulating material 10a which is urethane foam between the inner box 1a and the outer box 1b, and the doors 2a and 2b described above. It is separated by 3a, 4a, 5a, 6a. A plurality of vacuum heat insulating materials 26 are mounted inside the heat insulating box 10 of the refrigerator 1.

In the freezing room 60 and the vegetable room 6, an ice making room container (not shown), an upper freezing room container 4b, a lower freezing room container 5b, and a vegetable room container 6b, which are drawn out integrally with the doors 3a, 4a, 5a, and 6a, respectively, are provided. I have. Further, the refrigerating room 2 is provided with shelves 39 for partitioning the inside of the refrigerating room 2 into a plurality of shelves, and the doors 2a and 2b are provided with a plurality of pockets 32.
A door hinge (not shown) fixed to the refrigerator 1 is provided on the upper part of the refrigerator 1 in order to make the doors 2a and 2b rotatable, and the door hinge is covered with the door hinge cover 38. ..
A partition wall 28 is provided between the refrigerating room 2 and the freezing room 60, and a partition wall 29 is provided between the freezing room 60 and the vegetable room 6. Further, on the front side of each storage chamber of the ice making chamber 3, the upper freezing chamber 4, and the lower freezing chamber 5, the air in the freezing chamber 60 does not leak to the outside through the gaps of the doors 3a, 4a, and 5a. A partition wall 30 is provided.

A machine room 20 equipped with a compressor 24 is provided on the back side of the vegetable room 6. Further, an evaporator chamber 8 is provided on the back side of the freezing chamber 60. The evaporator chamber 8 is formed by an inner box 1a, a gutter 21, a partition member 103, a refrigerating chamber damper 50, and a freezing chamber damper 51, which will be described later. In the evaporator chamber 8, the evaporator 7 for heat exchange between the refrigerant and the air in the refrigerator, and the air cooled by the evaporator 7 are blown to each of the storage chambers of the refrigerating chamber 2, the vegetable compartment 6, and the freezing chamber 60. It is equipped with a refrigerator fan 9. Further, the lower part of the evaporator 7 is provided with a defrost heater 27 that heats the frost adhering to the evaporator 7 during the defrosting operation, and a gutter 21 that receives the defrosted water generated by the heating of the defrost heater 27. There is. The defrosted water that has flowed into the gutter 21 is discharged to the evaporating dish 23 arranged in the machine room 19 via the drain pipe 22.

A refrigerating room temperature sensor 33, a freezing room temperature sensor 34, and a vegetable room temperature sensor 35 are provided on the back side of the refrigerator chamber 2, the freezing chamber 60, and the freezing chamber 6, respectively, and the evaporator temperature is above the evaporator 7. Sensors 36 are provided, and the temperatures of the refrigerating room 2, the vegetable room 6, the freezing room 60, and the evaporator 7 are detected by these sensors. Further, the refrigerator 1 includes an outside air temperature sensor 37 provided inside the door hinge cover 38 for detecting the temperature outside the refrigerator, and a door sensor (not shown) for detecting the open / closed state of the doors 2a, 2b, 3a and 4a. ) Is also provided.

A control board 31 on which a CPU, a memory such as a ROM or RAM, an interface circuit, or the like, which is a part of the control device, is mounted is arranged on the upper part of the refrigerator 1. The control board 31 is connected to a refrigerating room temperature sensor 33, a freezing room temperature sensor 34, a vegetable room temperature sensor 35, an evaporator temperature sensor 36, etc., and the above-mentioned CPU has these output values and a temperature setting device (shown in the figure). The compressor 24, the internal fan 9, and the dampers 50 and 51 are controlled based on the setting of (1) and the program recorded in advance in the ROM described above.

Next, the air passage structure will be described. The refrigerator of Example 1 cools the refrigerating room 2, the vegetable room 6, and the freezing room 60, which are storage rooms in the refrigerator, by blowing air cooled by the evaporator 7. The air blown to the refrigerating room 2 and the vegetable room 6 is controlled by the refrigerating room damper 50, and the air blown to the freezing room 60 is controlled by the freezing room damper 51.

When cooling the refrigerator compartment 2 and the vegetable compartment 6, the refrigerator compartment damper 50 is opened. The air in the evaporator chamber 8 cooled by the evaporator 7 is boosted by the fan 9 in the refrigerator and flows from the damper 50 in the refrigerator compartment to the air passage 11 in the refrigerator compartment. The refrigerating chamber air passage 11 is formed by an inner box 1a and a refrigerating chamber air passage component 80. The air that has reached the air passage 11 of the refrigerating chamber is discharged from the discharge port 61 to the refrigerating chamber 2 to cool the refrigerating chamber 2. The air that has cooled the refrigerator compartment 2 flows from the refrigerator compartment-vegetable chamber air passage (not shown) to the vegetable compartment 6, and cools the vegetable compartment 6. The air that has cooled the vegetable compartment 6 returns to the evaporator chamber 8 from the vegetable compartment return port 64 via the vegetable compartment return air passage 14, and is cooled again by the evaporator 7.

When cooling the freezing chamber 60, the freezing chamber damper 51 is opened. The air in the evaporator chamber 8 cooled by the evaporator 7 is boosted by the internal fan 9, and flows from the freezing chamber damper 51 to the freezing chamber air passage 12. The freezing chamber air passage 12 is formed by a partition member 102 and a partition member 103, which will be described later. The air that has reached the air passage 12 of the freezing chamber is discharged to the freezing chamber 60 from the discharge port 62 formed in the partition member 102 to cool the freezing chamber 60. The air that has cooled the freezing chamber 60 returns to the evaporator chamber 8 from the freezing chamber return air passage 17, and is cooled again by the evaporator 7.

As described above, the refrigerator of the first embodiment includes both the refrigerating room 2 and the vegetable room 6 which are the storage rooms in the refrigerating temperature zone and the storage room in any of the temperature zones of the freezing room 60 which is the storage room in the freezing temperature zone. It is cooled by the air cooled by the evaporator 7. Therefore, the evaporator chamber 8 provided with the evaporator 7 circulates both the air in the refrigerating temperature zone and the air in the refrigerating temperature zone.

FIG. 3 is a time chart in an example of the cooling operation of the refrigerator. Since the air passages are arranged in series in the refrigerating chamber 2 and the vegetable compartment 6 and cooled in conjunction with each other, the control of the vegetable compartment 6 is omitted. The cooling operation of the refrigerator includes a refrigerating operation for cooling the refrigerating chamber 2 while the compressor 24 is driven, a refrigerating operation for cooling the refrigerating chamber 60, and a blowing operation for cooling the refrigerating chamber 2 when the compressor 24 is stopped. Based on the driving pattern.

When the compressor 24 rises to the freezing chamber temperature TF1 during the ventilation operation, the compressor 24 is turned on and the refrigerating operation is performed. In the refrigerating operation, the refrigerating chamber damper 50 is opened and the internal fan 9 is operated to cool the refrigerating chamber 2 with the air passing through the low-temperature evaporator 7 and lower the refrigerating chamber temperature to the temperature TR. When the refrigerating chamber temperature reaches the temperature TR, a freezing operation is performed in which the refrigerating chamber damper 50 is closed and the freezing chamber damper 51 is opened. When the freezing chamber temperature reaches TF2, the freezing operation ends and the compressor 24 is stopped. During the air blowing operation, as in the refrigerating operation, the refrigerating chamber damper 50 is opened and the internal fan 9 is operated to cool the refrigerating chamber 2 using the air cooled by the frost grown in the evaporator 7. By these operations, the refrigerating chamber 2 and the freezing chamber 6 are cooled and maintained at a predetermined temperature. In the example of the present embodiment, the ventilation operation and the refrigeration operation are collectively referred to as a refrigeration cooling operation.

FIG. 4 is an enlarged view of the periphery of the evaporator chamber 8 shown in FIG.

The freezing chamber 60 and the evaporator chamber 8 are partitioned by a partition member 102 and a partition member 103. The partition member 102, which is the second member constituting the wall surface on the freezing chamber 60 side, is made of polypropylene, for example, which is a kind of resin member, and has a thickness of 1.5 mm. The partition member 103, which is the first member constituting the wall surface of the evaporator chamber 8, is made of, for example, foam-molded polystyrene foam (styrofoam). The thickness of the partition member 103 is set to 10 mm in consideration of moldability at the time of foaming, assembling property at the time of incorporating in a refrigerator, impact resistance, and suppression of temperature fluctuation of the freezing chamber 60 described later. Polypropylene has a density of about 910 kg / m ³ and a specific heat of about 1.7 kJ / (kg · K), and a heat capacity per unit volume (product of specific heat and density) of about 1500 kJ / (m ³ · K). The foam has a density of about 40 kg / m ³ and a specific heat of about 1.8 kJ / (kg · K), and a heat capacity per unit volume of about 70 kJ / (m ³ · K).
As described above, the foam-molded polystyrene foam (partition member 103) has a lower density than polypropylene (partition member 102) and has a smaller heat capacity per unit volume. When the heat capacity per unit volume is small, the temperature changes with a small amount of heat.

5 and 6 are diagrams showing changes in the temperature gradient of the wall surface with respect to changes in ambient temperature. FIG. 5 shows a case where the heat capacity per unit volume of the heat insulating member constituting the wall surface is small, and FIG. 6 shows a case where the heat capacity per unit volume is large. The thickness of the heat insulating member, the thermal conductivity, and the heat transfer coefficient of the wall surface surface are the same in FIGS. 5 and 6.

Here, consider a case where the air temperature Ta near the wall surface suddenly changes from _a low temperature to a high temperature. The temperature gradient shown in FIGS. 5 (a1) and 6 (a2) is a state in which the air in the vicinity of the wall surface is kept at a low temperature for a long time and the wall surface is sufficiently cooled. The initial conditions are that the air temperatures _{Ta (a1)} and _{Ta (a2)} and the wall surface temperatures T _{w (a1) and} T _{w (a2)} are all low temperatures.

5 (b1) and 6 (b2) show a state in which the temperature of the air is sharply increased with respect to the initial conditions. To raise the air temperature _{Ta (b1)} and _{Ta (b2)} while keeping the wall temperature T _{w (b1)} and T _{w (b2)} at low temperatures T _{w (a1) and} T _{w (b1)} , the air temperature is increased. Temperature differences ΔT _(b1) and ΔT _(b2) occur between the walls. Since the wall surface is heated by this temperature difference, the wall surface temperatures T _{w (c1) and} T _{w (c2)} in FIGS. 5 (c1) and 6 (c2) after Δt minutes (for example, 10 minutes later) are shown in FIG. (B1), higher than T _{w (b1) and} T _{w (b2} ) in FIG. 6 (b2).

Here, in FIG. 5, since the heat capacity per unit volume of the heat insulating member is small and the temperature changes with a small amount of heat, the temperature rise (T _{w (c1)} −T _{w (b1)} ) in Δt minutes is large. Therefore, the temperature difference ΔT _(c1) between the air and the wall surface in FIG. 5 (c1) becomes small. On the other hand, since the heat insulating member of FIG. 6 has a large heat capacity per unit volume and the temperature does not easily change, the temperature difference ΔT _(c2) between the wall surface and air is ΔT ₍ even in FIG. 6 (c2) after Δt minutes. Greater than _c1) .

In FIGS. 5 (d1) and 6 (d2), which are cases where the air is maintained at a high temperature for a long time (for example, several hours), a steady temperature gradient is obtained, and the temperature difference between the wall surface and the air ΔT ₍ Both _d1) and ΔT _(d2) are small, and are the same (ΔT _(d1) = ΔT _(d2) ) regardless of the heat capacity.

From the above, if a member having a small heat capacity per unit volume is used, the wall surface temperature tends to rise, so that the temperature gradient becomes close to steady in a short time, that is, the temperature difference between the wall surface and air becomes small. Therefore, in the embodiment of the present embodiment in which the partition member 103 uses a member having a small heat capacity per unit volume, even if the air temperature in the evaporator chamber 8 changes, the wall surface of the partition member 103 on the evaporator chamber 8 side is used. The temperature difference with air can be reduced. The effect obtained by this will be described below.

FIG. 7 is a time chart showing temperature changes at the temperature measurement points X and Y shown in FIG. As shown in FIG. 4, the temperature measurement point X is provided on the wall surface of the partition member 103 on the evaporator chamber 8 side, and the temperature measurement point Y is provided in the air near the evaporator 7 in the evaporator chamber 8. FIG. 7 shows the temperature of the temperature measurement point Y by the solid line and the temperature of the temperature measurement point X by the broken line, and when the heat capacity per unit volume of the partition member 103 is large by the dotted line, for example, the partition member 103 and the partition member 102 Similarly, the temperature at the temperature measurement point X when polypropylene is used is shown.

As shown in FIG. 3, the refrigerator 1 of the present embodiment is provided with the refrigerating chamber damper 50 and the freezing chamber damper 51, so that the freezing operation in which the air in the freezing chamber 60 circulates and the air in the refrigerating chamber 2 are separated. A circulating refrigerating air blowing operation is provided, and the two operations are appropriately switched to cool the refrigerating chamber 2 and the freezing chamber 60 individually. Since air in a different temperature range flows in each operation, the air temperature in the evaporator chamber 8 changes significantly. For example, the temperature of the temperature measuring point Y in the evaporator chamber 8 is cooled during the freezing operation and becomes TY1 (for example, about −25 ° C.) at the end of the freezing operation. On the other hand, during the refrigerating cooling operation, the air in the refrigerating chamber 2 in the refrigerating temperature zone flows in, so that the temperature at the temperature measuring point Y rises. ℃). Due to this temperature fluctuation, the temperature measurement point X adjacent to the temperature measurement point Y is cooled by the low temperature air around the temperature measurement point Y during the refrigerating operation, and is relatively relatively around the temperature measurement point Y in the next refrigerating cooling operation. It is heated by hot air. That is, during the refrigerating and cooling operation, heat is transferred from the air in the evaporator chamber 8 to the partition member 103.

Since the air is cooled by the heat transfer to the partition member 103, the amount of heat cooled by the evaporator 7 during the refrigerating cooling operation is reduced by the amount of the transferred heat. On the other hand, the amount of heat transferred to the partition member 103 is cooled in the next freezing operation. Therefore, the total amount of heat cooled in the freezing operation and the refrigerating cooling operation in the evaporator 7 is constant, but the ratio of the amount of heat cooled in the refrigerating operation is large.

On the other hand, even if the amount of heat cooled by the evaporator 7 is the same, high energy saving performance can be obtained by reducing the ratio of the amount of heat cooled by the freezing operation. This is because, as shown in FIG. 3, the temperature of the evaporator 7 is higher in the refrigerating operation than in the refrigerating operation, and the cooling efficiency (ratio of the amount of heat to be cooled to the amount of power consumption) is higher. That is, by increasing the ratio of the amount of heat to be cooled in the highly efficient refrigeration operation, the average cooling efficiency in the entire operation can be increased. From the above, it can be seen that the energy saving performance is improved by suppressing the heat transfer to the partition member 103, reducing the ratio of the amount of heat cooled in the refrigerating operation, and increasing the ratio of the amount of heat cooling in the refrigerating operation.

On the other hand, the partition member 103 of the embodiment of the present embodiment uses polystyrene foam and has a small heat capacity per unit volume so that the temperature changes with a small amount of heat. Since the temperature is liable to change, the temperature measurement point X of the partition member 103 always maintains a temperature close to the temperature measurement point Y even if the temperature of the temperature measurement point Y (air in the evaporator chamber 8) changes significantly. Therefore, the temperature difference between the temperature measurement point X and the temperature measurement point Y during the refrigerating / cooling operation is smaller than when the heat capacity per unit volume of the partition member 103 is large (dotted line). Since the heat transfer between the air in the evaporator chamber 8 and the partition member 103 is caused by the temperature difference between the air in the evaporator chamber 8 and the side wall surface of the evaporator chamber 8 of the partition member 103, the temperature difference between the air and the wall surface is large. In the small example of the present embodiment, the heat transfer from the evaporator chamber 8 to the partition member 103 is also small.

Therefore, by using polystyrene foam having a low density and a small heat capacity per unit volume for the partition member 103 constituting the wall surface on the evaporator chamber 8 side, heat transfer from the evaporator chamber 8 to the partition member 103 can be suppressed. The amount of heat cooled by the freezing operation can be suppressed. As a result, the ratio of the amount of heat to be cooled in the highly efficient refrigeration operation is larger than that in the refrigeration operation, and high energy saving performance can be obtained.

Further, with this configuration, the effect of suppressing the temperature fluctuation of the freezing chamber 60 to be small can be obtained.

As described above, since the heat transfer to the partition member 103 during the refrigerating and cooling operation is suppressed to a small extent, the heat transfer from the evaporator chamber 8 to the partition member 102 via the partition member 103 is also small and easy to suppress.

In addition, the partition member 102 constituting the wall surface on the freezing chamber 60 side uses polypropylene having a higher density and a larger heat capacity per unit volume than the partition member 103. When the heat capacity per unit volume is large, the temperature change can be suppressed to be small even if the amount of heat transferred is the same. Therefore, even if heat is transferred from the evaporator chamber 8 to the partition member 102 via the partition member 103, the temperature of the partition member 102 does not easily change and the low temperature can be maintained. As a result, heat transfer from the partition member 102 to the freezing chamber 60 can be suppressed, and temperature fluctuations in the freezing chamber 60 can be further suppressed.

Further, when the air temperature in the freezing chamber 60 suddenly rises due to opening and closing of the freezing chamber door 5a, for example, the partition member 102 having a large heat capacity acts as a cold storage material, and the air in the freezing chamber 60 is cooled by the low temperature partition member 102. can do. Therefore, the temperature of the freezing chamber 60 can be lowered in a shorter time, and in that respect as well, the effect of suppressing the temperature fluctuation of the freezing chamber 60 can be obtained.

From the above, by using a member having a large heat capacity per unit volume for the partition member 102 and a member having a small heat capacity per unit volume for the partition member 103, evaporation during the refrigerating operation while suppressing the temperature fluctuation of the freezing chamber 60. It is possible to suppress heat transfer from the vessel chamber 8 to the partition member 103 and obtain high energy saving performance.

The above effects are not limited to the case where the partition member 102 is polypropylene and the partition member 103 is polystyrene foam, respectively. A material having a large heat capacity is used for the partition member 102, and the partition member 103 has a small heat capacity per unit volume. The material may be used. For example, a resin material such as ABS (acrylonitrile-butadiene-styrene plastic) or polystyrene, or a metal material may be used for the partition member 102. These have a high density of 800 kg / m ³ or more, and therefore a large heat capacity per unit volume of 1000 kJ / (m ³ · K) or more. Since the partition member 102 is a member that the user can directly touch when, for example, the lower freezing chamber door 5 is opened and the lower freezing chamber container 5b is pulled out, the resin member is difficult to break when touched. It is effective to use a metal member or a metal member.

Further, for example, as in the case of polystyrene foam, foamed polyethylene or urethane foam molded by foaming, or glass wool, which is a cotton-like material, may be used for the partition member 103. Since these have gaps (gas space, etc.) inside, the density is generally as low as 100 kg / m ³ or less, and therefore the heat capacity per unit volume is also generally 100 kJ / (m ³ · K) or less. And small.

FIG. 8 is an example of analysis results showing the relationship between the heat capacity per unit volume and the amount of heat transfer flowing into the member during the refrigerating operation. The solid line is the case where the thickness corresponding to the partition member 103 is 10 mm, and the broken line is the case where the thickness corresponding to the partition member 102 is 1.5 mm. The vertical axis is a dimensionless value of the heat transfer amount, and the heat transfer amount generated when the thickness is 1.5 mm and the heat capacity per unit volume is 1000 kJ / (m3 · K) is ¹ . The thermal conductivity is constant.

Here, in the case of a thickness of 10 mm, the heat transfer amount becomes 1 when the heat capacity per unit volume is 300 kJ / (m ³ · K). Therefore, if the heat capacity per unit volume is 300 kJ / (m ³ · K) or less, even if the thickness is 10 mm, it is equivalent to the case where the thickness is 1.5 mm and the heat capacity per unit volume is 1000 kJ / (m ³ · K). The heat transfer amount is as follows. That is, the amount of heat transfer can be suppressed as compared with the case of using a resin member having a heat capacity of 1000 kJ / ⁽ m3 · K) or more per unit volume.

Further, as in the case of foamed polyethylene, urethane foam, and glass wool used for the partition member 103, if the heat capacity per unit volume is 100 kJ / (m ³ · K) or less, the thicknesses are 1.5 mm and 10 mm as shown in FIG. The difference in heat transfer amount is 5% (= (0.68 / 0.65) -1) or less. That is, since the amount of heat transfer can be kept small regardless of the thickness, a member having a heat capacity of 100 kJ / ⁽ m3 · K) or less per unit volume is particularly effective for suppressing heat transfer. In the embodiment of the present embodiment, the partition member 103 uses polystyrene foam having a heat capacity of 70 kJ / (m ³ · K) or less, that is, 100 kJ / (m ³ · K) or less per unit volume, so that energy saving performance can be further improved. Can be improved. In addition, these, polystyrene foam, expanded polyethylene, urethane foam, and glass wool generally have lower thermal conductivity than resin materials and metal materials. For example, polypropylene has a thermal conductivity of about 0.2 W / (m · K), whereas polystyrene foam has a thermal conductivity of about 0.03 W / (m · K). Therefore, in addition to the effect of reducing the temperature difference by the heat capacity per unit volume, the effect of suppressing the heat transfer by the effect of suppressing the thermal conductivity can be obtained, so that even higher energy saving performance can be obtained.

Since the portion of the wall surface of the partition member 103 located substantially in front of the evaporator 7 (for example, the temperature measurement point X) is directly cooled by the evaporator 7, the temperature tends to be particularly low during the freezing operation. Therefore, the temperature difference between the wall surface of the partition member 103 substantially in front of the evaporator 7 and the air in the evaporator chamber 8 in the refrigerating / cooling operation tends to be particularly large. Therefore, in order to suppress heat transfer due to the temperature difference, it is effective to provide a member having a small heat capacity per unit volume, particularly on the substantially front surface of the evaporator 7, among the partition members 103.

Further, as described above, by making the partition member 103 thicker than the partition member 102, the effect of increasing the heat capacity (kJ / K) of the entire partition member 103 can be obtained. Since the average temperature of the entire partition member 103 becomes difficult to rise due to the increase in the overall heat capacity, even if the wall surface temperature of the partition member 103 on the evaporator chamber 8 side rises during the refrigerating / cooling operation, the partition member 103 is frozen. The temperature on the room side (partition member 102 side) is difficult to rise. That is, by making the partition member 103 thicker, it is possible to further suppress the temperature fluctuation of the freezing chamber 60 via the partition member 102.

Further, a waterproof sheet 104 made of aluminum having a thickness of 0.1 mm is attached to the surface of the partition member 103 on the evaporator chamber 8 side. For example, defrost water is generated when the evaporator is defrosted, but if water infiltrates into the partition member 103, the heat capacity per unit volume increases. Therefore, by providing the waterproof sheet 104, water inside the partition member 103 is provided. Intrusion is suppressed. By using a thin sheet having a thickness of 0.5 mm or less and 0.1 mm in the present embodiment, the influence of the waterproof sheet 104 on the heat transfer between the partition member 103 and the evaporator chamber 8 is suppressed. ..

<< Example 2 >>
Hereinafter, Example 2 of the present invention will be described. The configuration of this embodiment can be the same as that of the first embodiment except for the following points. Example 2 is an example of a refrigerator in which the vegetable compartment 6 is arranged in the middle stage and the freezing chamber 60 is arranged in the lower stage.

9 is a front view of the refrigerator according to the second embodiment, and FIG. 10 is a sectional view taken along the line BB shown in FIG. The refrigerator 1 of the second embodiment includes a refrigerating room 2, a vegetable room 6, and a freezing room 60 (ice making room 3, upper freezing room 4, and lower freezing room 5) in order from the top as storage rooms. A partition wall 28a is provided between the refrigerating room 2 and the vegetable room 6, and a partition wall 29a is provided between the vegetable room 6 and the freezing room 60. When the vegetable chamber 6 is too cold, the vegetable chamber 6 is heated by the vegetable chamber heater 204 provided on the upper part of the partition wall 29a and kept at a predetermined temperature.

Although the arrangement of the storage chamber and the air passage is different, the basic air flow is the same as that of the first embodiment. When cooling the refrigerator compartment 2 and the vegetable compartment 6, the refrigerator compartment damper 50 is opened to drive the refrigerator fan 9. The air in the evaporator chamber 8 cooled by the evaporator 7 is the refrigerator fan 9, the refrigerator chamber damper 50, the refrigerator chamber air passage 11, the discharge port 61, the refrigerator chamber 2, the refrigerator chamber-vegetable chamber air passage 13, and vegetables. It flows in the order of the chamber 6, the vegetable compartment return port (not shown), the vegetable compartment return air passage (not shown), and the evaporator chamber 8, and is cooled again by the evaporator 7. When cooling the freezing chamber 60, the freezing chamber damper 51 is opened to drive the internal fan 9. The air in the evaporator room 8 cooled by the evaporator 7 is the internal fan 9, the freezer room damper 51, the freezer room blower air passage 12, the discharge port 62, the freezer room 60, the freezer room return air passage 17, and the evaporator room. It flows in the order of 8, and is cooled again by the evaporator 7.

In the refrigerator of the second embodiment, the evaporator room 8 is provided on the back side of the vegetable room 6 and the freezing room 60, and has an inner box 1a, a gutter 21, partition members 203a and 203b, a refrigerating room damper 50, and a freezing room damper 51. Is formed by. The generator room 8 and the freezing room 60 are partitioned by a partition member 202a on the freezing room side and a partition member 203a on the evaporator room 8 side, and the evaporator room 8 and the vegetable room 6 are partitioned from the partition member 202b on the vegetable room 6 side. It is partitioned by the partition member 203b on the evaporator chamber 8 side. The partition member 202a, which is the third member constituting the wall surface of the vegetable compartment 6, and 202b, which is the second member constituting the wall surface on the freezing chamber 60 side, are made of polypropylene and constitute the wall surface on the evaporator chamber 8 side. The partition members 203a and 203b, which are the first members, are made of polystyrene foam. The partition members 202a and 202b have a thickness of 1.5 mm, and the partition members 203a and 203b have a thickness of 10 mm.

Similar to the first embodiment, the partition members 203a and 203b constituting the wall surface on the evaporator chamber 8 side are made into members having a lower density and a smaller heat capacity per unit volume than the partition members 202a and 202b. As a result, similarly to the partition member 103 of the first embodiment, the temperature difference between the side wall surface of the evaporator chamber 8 of the partition members 203a and 203b and the air in the evaporator chamber 8 can be suppressed to a small size. That is, heat transfer to the partition members 203a and 203b during the refrigerating and cooling operation is suppressed, the ratio of the amount of heat to be cooled in the refrigerating operation with higher efficiency is larger than that in the refrigerating operation, and high energy saving performance can be obtained.

Further, by making the partition member 202a constituting the wall surface on the freezing chamber 60 side a member having a large heat capacity per unit volume, the temperature fluctuation of the partition member 202a can be suppressed and the partition can be partitioned as in the partition member 102 of the first embodiment. The temperature fluctuation of the freezing chamber 60 facing the member 202a can be suppressed.

In addition, in the configuration of the second embodiment, the temperature fluctuation of the vegetable compartment 6 is also suppressed by using a member having a large heat capacity per unit volume for the partition member 202b. The vegetable compartment 6 is basically highly humid due to the moisture evaporating from the vegetables, but when the temperature fluctuates, the moisture in the air condenses (condenses) and tends to become low humidity. When the vegetable chamber 6 has a low humidity, more water evaporates from the vegetables and it is easy to dry. Therefore, by suppressing the temperature fluctuation of the vegetable chamber 6 in this configuration, the preservability of food can be improved. ..

Further, the partition member 203b uses polystyrene foam having a lower thermal conductivity than the polypropylene of the partition member 202b, and has a thickness of 10 mm, which is thicker than the partition member 202b. Since the vegetable chamber 6 is in the refrigerating temperature zone, while the evaporator chamber 8 is basically in the freezing temperature zone, heat transfer from the vegetable chamber 6 to the evaporator chamber 8 via the partition members 202b and 203b is performed. Occurs. On the other hand, by using a member having a low thermal conductivity and a thickness for the partition member 203b, this heat transfer is also suppressed.

The heat of the vegetable compartment 6 is basically cooled by the refrigerating and cooling operation, but when the heat is transferred from the vegetable chamber 6 to the evaporator chamber 8 during the refrigerating operation, the heat is generated by the evaporator 7 which has become low temperature in the refrigerating operation. Is cooled. Therefore, by suppressing the heat transfer from the vegetable chamber 6 to the evaporator chamber 8, the ratio of the amount of heat cooled in the freezing operation can be suppressed to a small value. That is, the ratio of the amount of heat to be cooled by the highly efficient refrigerating operation becomes large, and high energy saving performance can be obtained.

Further, when heat transfer from the vegetable chamber 6 to the evaporator chamber 8 occurs, the vegetable chamber 6 is cooled to a low temperature, but by suppressing this heat transfer, it is possible to suppress the overcooling of the vegetable chamber 6. can. When the vegetable chamber 6 is too cold, the vegetable chamber 6 is heated by the vegetable chamber heater 204 in order to keep the vegetable chamber 6 at a predetermined temperature, but when the vegetable chamber 6 is heated by the vegetable chamber heater 204, the power consumption increases. Therefore, by suppressing the heat transfer from the vegetable chamber 6 to the evaporator chamber 8 and suppressing the overcooling of the vegetable chamber 6, the effect of improving the energy saving performance by suppressing the power consumption of the vegetable chamber heater 204 can be obtained.

The present invention is not limited to the above-mentioned examples, and includes various modifications. For example, the above-mentioned examples have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations. Further, it is possible to add / delete / replace a part of the configuration of the embodiment with another configuration.

For example, as the storage chamber in the refrigerating temperature zone, the refrigerating chamber 2 and the vegetable compartment 6 are provided in the present embodiment, but any one of the storage chambers in the refrigerating temperature zone may be used. Further, the air passages of the refrigerating room 2 and the vegetable room 6 may be arranged in parallel so that air can be blown to only one of them. Further, the partition members 202a and 202b, and the partition members 203a and 203b may be integrally molded products, respectively. Further, the partition members 202a and 202b and the partition members 203a and 203b may be made of different materials as long as they have the same characteristics.

1 Refrigerator 1a Inner box 1b Outer box 2 Refrigerator room (first storage room)
3 Ice making room (second storage room)
4 Upper freezing room (second storage room)
5 Lower freezing room (second storage room)
6 Vegetable room (first storage room)
7 Evaporator 8 Evaporator room 9 Refrigerator room side fan 10 Insulation box body 10a Foam insulation 11 Refrigerator room air passage 12 Freezer room air passage 13 Refrigerator room-Vegetable room air passage 14 Vegetable room return air passage 17 Freezer room return Air passage 20 Machine room 21 Damper 22 Drain pipe 23 Evaporator 24 Compressor 26 Vacuum insulation 27 Defrost heater 28, 28a, 29, 29a, 30 Partition wall 31 Control board 32 Pocket 33 Refrigerator room temperature sensor 34 Refrigerator room temperature sensor 35 Vegetable room temperature sensor 36 Evaporator temperature sensor 37 Outside air temperature sensor 38 Door hinge cover 39 Shelf 50 Refrigerator room damper 51 Freezer room damper 60 Freezer room (second storage room)
61 Refrigerator room discharge port 64 Vegetable room return port 65 Freezing room discharge port 80 Refrigerator room air passage component 102, 202a Partition member (second member that constitutes the wall surface on the second storage room side)
202b Partition member (third member constituting the wall surface on the first storage chamber side)
103, 203a, 203b Partition member (first member constituting the wall surface on the evaporator chamber side)
104 Tarpaulin 204 Vegetable room heater

Claims (6)

An evaporator that cools the first storage chamber in the refrigerating temperature zone, the second storage chamber in the freezing temperature zone, the first storage chamber and the second storage chamber, and the evaporation that houses the evaporator. In a refrigerator provided with a vessel chamber and a partition member for partitioning the evaporator chamber and the second storage chamber.
A refrigerating operation or a ventilation operation for cooling the first storage chamber while circulating the air in the first storage chamber in the evaporator chamber, and circulating the air in the second storage chamber in the evaporator chamber. It is possible to distinguish between the refrigeration operation of cooling the second storage chamber and the operation at different timings .
The partition member is composed of a plurality of members, and the first member of the partition member constituting the wall surface on the evaporator chamber side constitutes the wall surface of the partition member on the second storage chamber side. A refrigerator with a smaller heat capacity per unit volume than the second member. An evaporator that cools the first storage chamber in the refrigerating temperature zone, the second storage chamber in the freezing temperature zone, the first storage chamber and the second storage chamber, and the evaporation that houses the evaporator. In a refrigerator provided with a vessel chamber and a partition member for partitioning the evaporator chamber and the second storage chamber.
A refrigerating operation or a ventilation operation for cooling the first storage chamber while circulating the air in the first storage chamber in the evaporator chamber, and circulating the air in the second storage chamber in the evaporator chamber. It is possible to distinguish between the refrigeration operation of cooling the second storage chamber and the operation at different timings .
Among the partition members, the first member constituting the wall surface on the evaporator chamber side is a refrigerator having a heat capacity of less than ³⁰⁰ kJ / (m3 · K) and a thickness of 10 mm or less per unit volume. An evaporator that cools the first storage chamber in the refrigerating temperature zone, the second storage chamber in the freezing temperature zone, the first storage chamber and the second storage chamber, and the evaporation that houses the evaporator. In a refrigerator provided with a vessel chamber and a partition member for partitioning the evaporator chamber and the first storage chamber.
A refrigerating operation or a ventilation operation for cooling the first storage chamber while circulating the air in the first storage chamber in the evaporator chamber, and circulating the air in the second storage chamber in the evaporator chamber. It is possible to distinguish between the refrigeration operation of cooling the second storage chamber and the operation at different timings .
The partition member is composed of a plurality of members, and the first member of the partition member constituting the wall surface on the evaporator chamber side constitutes the wall surface of the partition member on the second storage chamber side. A refrigerator with a smaller heat capacity per unit volume than the second member. The refrigerator according to claim 1 or 3, wherein the first member is thicker than the second member. An evaporator that cools the first storage chamber in the refrigerating temperature zone, the second storage chamber in the freezing temperature zone, the first storage chamber and the second storage chamber, and the evaporation that houses the evaporator. In a refrigerator provided with a vessel chamber and a partition member for partitioning the evaporator chamber and the first storage chamber.
A refrigerating operation or a ventilation operation for cooling the first storage chamber while circulating the air in the first storage chamber in the evaporator chamber, and circulating the air in the second storage chamber in the evaporator chamber. It is possible to distinguish between the refrigeration operation of cooling the second storage chamber and the operation at different timings .
Among the partition members, the first member constituting the wall surface on the evaporator chamber side is a refrigerator having a heat capacity of less than ³⁰⁰ kJ / (m3 · K) and a thickness of 10 mm or less per unit volume. The evaporator chamber has a refrigerating damper and a freezing damper.
In the refrigerating operation or the blowing operation, by opening the refrigerating damper and closing the freezing damper, the air in the first storage chamber flows into the evaporator chamber.
The refrigerator according to any one of claims 1 to 5, wherein in the freezing operation, the air in the second storage chamber flows into the evaporator chamber by closing the refrigerating damper and opening the freezing damper.

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